Turbine Operation Manual

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Vietnam Vinh Tan Phase II 2!622MW Coal-Fired Power Generator Unit

Contents 1. Over Overvi view ew on steam steam turb turbin inee mai main n and and auxi auxilia liary ry equi equipm pmen ents ts·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· · 1 1.1 1.1 Over Overv view iew on ste steam turb turbin inee ····· ···· ···· ···· ····· ···· ····· ···· ···· ····· ···· ····· ···· ····· ···· ···· ···· ···· ····· ····· ···· ···· 1 1.2 1.2 Tec Techn hnic ical al spe speci cifi fica cati tion onss on ste steam am tur turbi bine ne prop proper er ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ·· 3 1.3 1.3 Spe Speci cifi fica cati tion onss on on stea steam m tur turbi bine ne auxi auxili liar ary y uni unitt ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ·· ··· ··· ··· · 8 1.4 1.4 Reg Regulati lating ng sec secur urit ity y syst system em····· ···· ····· ···· ····· ···· ····· ···· ···· ····· ···· ····· ···· ····· ···· ···· ···· ····· ···· ····· ···· ··· 26 26 1.5 1.5 Stea Steam m turb turbin inee unit unit pro prote tect ctio ion n ······ ····· ···· ····· ···· ····· ···· ···· ···· ····· ···· ····· ···· ····· ···· ···· ···· ····· ···· ····· ··· 32 32 2. Ste Steam am turb turbin inee un unit sta starrtup tup···· ···· ···· ····· ···· ····· ···· ···· ····· ···· ····· ···· ····· ···· ···· ···· ····· ···· ····· ···· ····· ···· ··· 34 34 2.1 2.1 Gene Genera rall prin principle ipless on unit unit sta startu rtup ····· ···· ···· ···· ···· ····· ···· ···· ···· ····· ···· ····· ···· ····· ···· ···· ···· ····· ···· ····· · 34 34 2.2 2.2 Prep Prepar arat atiions ons bef before ore unit unit sta start rtu up ···· ···· ···· ····· ···· ····· ···· ···· ···· ····· ···· ····· ···· ····· ···· ···· ···· ····· ···· ····· ··· 36 36 2.3 2.3 Test est bef before ore star startu tup p ···· ····· ···· ····· ···· ····· ···· ···· ···· ····· ···· ····· ···· ····· ···· ···· ···· ···· ····· ····· ···· ···· ···· ···· ·· 37 2.4 2.4 Ste Steam am turb turbin inee col cold d sli slide de para param meter eterss sta start rtup up ····· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ·· 38 2.5 2.5 Start tartu up at oth other stat statees ····· ···· ····· ···· ····· ···· ····· ···· ···· ···· ···· ····· ···· ····· ···· ···· ···· ····· ···· ····· ···· ···· ···· ·· 48 2.6 2.6 Ope Operati ration on mode mode inst instru rucction tionss for for DEH DEH ······ ···· ···· ····· ···· ····· ···· ···· ···· ···· ····· ···· ····· ···· ···· ···· ····· ···· ···· 50 2.7 Unit shutdown own ············· ············· ············· ············· ············· ············· ·············· ············ ······ 51 2.8 2.8 Equip Equipm ment ent maint mainten enan ance ce of the the turb turbin inee after after shut shutdo down wn··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ·· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ·· 56 3. Un Unit ope operati ration on an and mai main nten tenanc ance · ···· ···· ···· ····· ···· ····· ···· ···· ···· ····· ···· ····· ···· ····· ···· ···· ···· ····· ···· ····· ··· 58 58 3.1 3.1 Ope Operati ration on and and maint ainten enan ance ce con conten tents ···· ···· ····· ···· ····· ···· ····· ···· ···· ···· ····· ···· ····· ···· ···· ···· ···· ····· ···· ·· 58 3.2 3.2 Moto Motorr norm normal al oper operat atio ion n and and maint ainten enan ance ce ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ·· ··· ··· ··· ··· · 59 3.3 3.3 Unit Unit oper operat atio ion n mode ode ···· ···· ···· ····· ···· ····· ····· ···· ···· ···· ···· ····· ···· ····· ···· ···· ···· ····· ···· ····· ···· ····· ···· ··· 61 3.4 3.4 Norm Normal al runn runnin ing g para param meter eter moni monito tori ring ng ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ·· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ·· 65 3.5 3.5 Reg Regular lar jobs jobs of of the the equ equipm ipment ent ···· ···· ···· ···· ····· ···· ····· ···· ···· ···· ····· ···· ····· ···· ···· ····· ···· ····· ···· ····· ···· · 70 3.6 3.6 Unit Unit in interl terloc ock k prot protec ecti tion on and and te test · ····· ···· ····· ···· ····· ···· ···· ···· ····· ···· ····· ···· ····· ···· ···· ···· ···· ····· ···· ···· 72 4. Uni Unit acci accid dent ent disp isposal osal ···· ····· ···· ····· ····· ···· ····· ····· ···· ····· ····· ···· ····· ···· ···· ···· ···· ····· ···· ····· ···· ···· ···· ·· 91 4.1 4.1 Acc Accid ideent disp dispos osal al pri prin ncipl ciplee · ····· ····· ···· ····· ···· ····· ···· ···· ···· ····· ···· ····· ···· ····· ···· ···· ···· ····· ···· ····· ···· · 91 4.2 4.2 Emerg Emergen ency cy shutd shutdow own n and acci accide dent ntal al shut shutdow down n condi conditi tion on and and dispo disposa sall ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· 92 4.3 4.3 Ste Steam am pa param ramete eter abn abnorm ormity ity ···· ···· ····· ···· ····· ···· ····· ···· ···· ····· ···· ····· ···· ····· ···· ···· ···· ···· ····· ····· ···· ··· 95 95 4.4 4.4 Unit Unit loa load huntin nting g ···· ···· ···· ····· ···· ····· ···· ···· ···· ···· ····· ···· ····· ···· ···· ···· ····· ···· ····· ···· ····· ···· ···· ···· ···· 96 4.5 4.5 Unit Unit loa load shed sheddi din ng ···· ···· ···· ····· ···· ····· ···· ···· ···· ····· ···· ····· ···· ····· ···· ···· ···· ···· ····· ···· ····· ····· ····· ···· 97 4.6 4.6 Bre Breakin aking g of con condens denser er vac vacu uum···· ····· ···· ····· ···· ····· ···· ···· ···· ····· ···· ····· ···· ····· ···· ···· ···· ····· ···· ····· ··· 97 97 4.7 4.7 Lar Large unit unit vibra ibrati tion on ···· ····· ···· ····· ····· ···· ····· ····· ···· ····· ····· ···· ····· ···· ···· ···· ···· ····· ···· ····· ···· ···· ···· ·· 99 4.8 4.8 Ste Steam am turbi urbin ne wat wateer impa impact ct ···· ···· ····· ···· ····· ···· ····· ···· ···· ····· ···· ····· ···· ····· ···· ···· ···· ···· ····· ····· ···· · 100 100 4.9 4.9 Bla Blade de of the the tu turbin rbinee dro drops ps···· ···· ····· ···· ····· ···· ····· ···· ···· ···· ····· ···· ····· ···· ···· ···· ····· ···· ····· ···· ····· ··· 101 101 Steam Turbine Operation Manual I


4.10 4.10 Axial xial disp displa lace ceme ment nt of main main engi engine ne is nor norm mal ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ·· 102 102 4.1 4.11 Lub Lubri rica cati ting ng oil oil sys syste tem m fau fault lt of main main engi engine ne ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· · 103 103 4.12 4.12 Hig High h bear bearin ing g temp temper erat atur uree of aut autom omob obil ilee moto motorr ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ·· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ·· ··· ·· 105 4.13 EH oil system fault······································································································ 106 4.14 4.14 Low Low Sea Seali lin ng oil oil pres pressu sure re ···· ···· ····· ···· ····· ···· ····· ···· ···· ···· ···· ····· ···· ····· ···· ···· ···· ····· ···· ····· ···· ···· 107 107 4.15 4.15 Recy ecycling ling water ter pum pump fau fault ···· ···· ····· ···· ····· ···· ····· ···· ···· ···· ····· ···· ····· ···· ···· ···· ····· ···· ····· ···· ···· 107 107 4.16 4.16 Clos Closed ed cool coolin ing g wate waterr syst system em fail failur uree ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· · 109 109 4.17 4.17 Fau Fault ltss of aux auxil ilia iary ry equ equip ipme ment nt ··· ···· ···· ···· ····· ···· ····· ···· ···· ···· ····· ···· ····· ···· ····· ···· ···· ···· ····· ···· ···· 110 4.18 4.18 Rev Rever ersi sion on of of the the ste steam pum pump p ····· ···· ····· ···· ····· ···· ····· ···· ···· ····· ···· ····· ···· ····· ···· ···· ···· ····· ···· ····· · 111 4.19 Motor fault ······· ············· ············ ·············· ············· ············· ············· ············ ·············· 112 4.20 4.20 All aux auxil ilia iary ry ful fulll-po pow wer loss loss ···· ···· ····· ···· ····· ···· ····· ···· ···· ···· ····· ···· ····· ···· ···· ···· ····· ···· ····· ···· ···· 114 4.21 4.21 Gene Genera rato torr cooli oolin ng syst system em fau fault ····· ···· ····· ····· ···· ····· ···· ···· ···· ···· ····· ···· ····· ···· ···· ····· ···· ····· ···· ···· 116 4.22 Fir Fire ············· ·············· ············ ·············· ············ ·············· ············· ············· ············· ·· 117 117 4.23 DCS fault ············· ·············· ············ ············· ············· ············· ·············· ············ ········· 118 4.24 Anti-accid Anti-accident ent measure measuress for preven preventing ting water water inflow inflow of turbine turbine and main main shaft shaft curving curving · ·· ·· · ·· ·· ·· ·· · ·· ·· ·· ·· 120 4.25 Anti-accid Anti-accident ent measures measures of of preventing preventing oil leakage leakage and and pad burning burning of the steam steam turbine turbine ·· ·· · ·· ·· ·· ·· · ·· ·· ·· ·· 122 4.26 Main steam valve or regulation valve jam after the steam turbine trips·········································· 123 4.27 4.27 AntiAnti-acc accide ident nt measur measures es of preven preventing ting over overspe speed ed operat operation ion of the the steam turb turbine ine ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· · 123 4.28 If two pumps operate, while one steam pump trips, please dispose as electrical water supply pump is not connected. ····· ·············· ············· ············· ············· ············ ·············· ············ ·············· ·· 124 5. Startup curve ············· ·············· ············ ············· ············· ············· ·············· ············ ········· 126 5.1 Cold startup curve ········································································································ 126 5.2 5.2 Warm star startu tup p curv curvee ···· ···· ···· ···· ····· ···· ····· ···· ···· ···· ····· ···· ····· ···· ···· ···· ····· ···· ····· ···· ····· ···· ···· ···· 127 127 5.3 Hot startup curve ········································································································· 129 5.4 5.4 Extr Extreemely-h ly-hot ot sta start rtu up curv curvee ···· ···· ···· ····· ···· ····· ···· ···· ····· ···· ····· ···· ····· ···· ···· ···· ····· ···· ····· ···· ····· · 131 131 6. Aux Auxilia iliarry equ equipm ipment ent star startt-sstop top ···· ···· ····· ···· ····· ···· ····· ···· ···· ···· ····· ···· ····· ···· ···· ···· ····· ···· ····· ···· ···· 133 133 6.1 General provisions ······································································································· 133 6.2 6.2 Ope Open n coo cooli ling ng water ater syst system em fall fallin ing g int into o sto stop p ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ·· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· 135 135 6.3 Closed cooling water system shutdown ··············································································· 136 6.4 6.4 Aux Auxilia iliary ry ste steam syst system em shu shutdow tdown n ······· ····· ···· ····· ···· ····· ···· ···· ···· ····· ···· ····· ···· ···· ····· ···· ····· ···· ···· 138 138 6.5 6.5 Con Conden densate sate sy system stem shu shutd tdow own n ···· ···· ····· ···· ····· ···· ····· ···· ···· ···· ····· ···· ····· ···· ···· ···· ····· ···· ····· ···· ···· 140 140 6.6 Deaerator shutdown ······································································································ 143 6.7 6.7 Sta Start and and sto stop p of elec electr tric ic fe feed pum pump p ···· ···· ···· ····· ···· ····· ···· ···· ···· ····· ···· ····· ···· ····· ···· ···· ···· ····· ···· ·· 146 6.8 6.8 Sta Start rt and and sto stop p of of the the stea steam m fee feed d pum pump p uni unitt ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ·· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ·· 149 149 Steam Turbine Operation Manual

II


6.9 6.9 Hea Heate terr put putti ting ng into into oper operat atio ion n and and shut shutdo down wn ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ·· ··· ··· ··· 155 155 6.10 Input and breakdown of main engine shaft gland system·························································· 161 6.11 6.11 Putt Puttin ing g into into oper operat atio ion n and and shut shutdow down n of vacuu vacuum m syst system em ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· · 164 164 6.12 6.12 Putti Putting ng into into operat operation ion and shutdow shutdown n of main main engine engine lubrica lubricatin ting g oil oil system system ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· 166 6.13 6.13 Putt Puttin ing g int into o oper operat atio ion n and and shu shutd tdow own n of main main eng engin inee oil oil cool cooler er ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· 169 169 6.14 6.14 Put Putti ting ng int into o oper operat atio ion n and and shut shutdo down wn of of EH oil oil syst system em ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· 170 170 6.15 6.15 Putt Puttin ing g into into opera operati tion on and and shutd shutdow own n of gener generat ator or seal sealin ing g oil syste system m ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· 172 172 6.16 6.16 Putti Putting ng into into operat operation ion and shutdow shutdown n of genera generator tor hydrog hydrogen en cool cooling ing system system ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· · 176 6.17 6.17 Putti Putting ng into into oper operati ation on and and shutd shutdown own of gene generat rator or stato statorr coolin cooling g water water syst system em · ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· · 183 6.18 6.18 Put Putti ting ng int into o oper operat atio ion n and and shut shutdow down n of cir circu culat latin ing g wate waterr syst system em ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· ·· 185 185 6.19 6.19 Ope Opera rati ting ng inst instru ruct ctio ion n on rubb rubber er bal balll was washi hing ng ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ·· ··· ··· ··· ··· ··· ··· ··· ··· ··· ··· ·· ··· ··· · 189

Steam Turbine Operation Manual III


1. 1.1

Overview on steam steam turbine main and auxiliary auxiliary equipments equipments Overview on steam turbine This steam turbine is a subcritical, single-shaft, reheating, three-cylinder four-exhaust, condensing steam

turbine. HP-IP-LP (high pressure/intermediate pressure/low pressure) cylinder is of double-shell cylinder structure; HP-IP (high pressure/intermediate pressure) part is the combined cylinder reverse arrangement, and LP (low pressure) part is for symmetric double split flow. flow. The steam turbine part shafting is composed of one HP-IP rotor and two LP rotors, etc. Except front-end bearing pedestal for floor-type, all are semi-floor pedestals. Main steam reaches main steam valve (MSV)

and regulating steam valve on both sides of steam

turbine respectively through one main steam pipe from the boiler, and enters the steam chamber installed in HP cylinder through 4 flexible steam conducts, connected to 2 steam inlet pipe joints respectively at upper, lower half of HP-IP outer cylinder symmetrically. HP flow path is composed of one-stage single-row governing stage (impulse) and nine-stage pressure stage (reaction). HP nozzle block is installed in steam chamber, and nine-stage diaphragm is installed on HP diaphragm sleeve, supported by the cylinder. Main steam enters the steam chamber and regulating stage through 2 inlets of 2 main steam valves and 4 regulating steam valves on both sides of HP-IP cylinder respectively at upper, lower of central HP-IP cylinder, and then runs through HP flow path stages. st

Some HP steams are extracted to #1 HP heater through the 1 section steam extraction opening downwards after HP stage 6. HP cylinder cylinder exhausts gas from the lower part of double exhaust opening through cold reheat steam pipe to return to the boiler reheater, some steams of which are extracted to #2 HP heater nd

through the 2 section steam extraction opening. The reheat steams out of boiler reheater arrive at reheat main steam valve and reheat regulating steam valve on both sides of steam turbine through hot reheat steam pipe, and enter into IP IP cylinder from from both sides at upper, upper, lower part. Adopt reaction pressure stage completely for IP cylinder with 6 stages divided into 2 parts. Part 1 is LP stage 1-3, and the diaphragm is installed on IP #1 diaphragm sleeve; Part 2 is IP stage 4-6, and the diaphragm is installed on IP #2 diaphragm sleeve. IP #1 diaphragm sleeve is installed on IP inner cylinder; IP #2 diaphragm sleeve is installed on HP-IP outer cylinder. cylinder. rd

Some steams from IP cylinder stage 3 are extracted to #3 HP heater through the 3 section steam extraction opening at HP-IP outer cylinder upper half part. IP cylinder upward steam exhaust is imported into the middle part of two LP cylinders respectively through 2 IP-LP connecting pipes. Meanwhile, the bottom of th

IP-LP cylinder steam exhaust is the 4 section steam extraction opening, through which part of steams are extracted out for deaerator and plant steams. Adopt symmetric double split flow reaction pressure stage for LP cylinder, including 2*2*7 stages. The nd

steams enter from LP cylinder middle part, and then flow towards the 2 section steam exhaust opening and enter into bottom condenser. Due to symmetric double split flow, LP rotor axial thrust is automatically Steam Turbine Operation Manual Page 1 of 197


balanced, and the axial thrust generated on the rotor is almost zero. The steam extraction openings will be installed completely symmetrically after #1 LP cylinder stage 2, 5, 6 and #2 cylinder stage 4, 5, 6, th

th

th

th

respectively, used as the steam extraction openings for the 5 section, 6 section, 7 section and 8 section respectively, respectively, and the steams are extracted to the corresponding LP heaters. heaters. This steam turbine is a kind of reaction steam turbine, so the axial thrust of turbine stages is comparatively large. T To o reduce axial thrust, in addition to HP-IP flow path designed into reverse arrangement and LP flow path design into reverse double-flow arrangement, adopt the equalizing piston in terms of rotor structure to greatly reduce the axial thrust, and the residual axial thrust is to be borne by the thrust bearing, installed in bearing seat between #1 LP cylinder and HP-IP cylinder, forming the relative anchor point of the rotor at the thrusting bearing. The front-end bearing pedestal and #2 LP cylinder motor-end bearing pedestal are equipped with differential expansion detector to monitor the unit differential expansion state. The steam turbine stator anchor point is located at center of #1 LP cylinder, namely, the intersection point of # 1 LP cylinder axial and transverse positioning fixed plate central lines. LP cylinder legs are placed freely on LP cylinder foundation deck to guarantee free expansion and contraction in different directions. The front-end bearing pedestal is placed on front-end bearing pedestal deck freely. freely. With feather keys between the front-end bearing pedestal and the deck, the front-end bearing pedestal only slides along turbine axial direction on the deck. 2 pressing plates on both side of front-end bearing pedestal will press the front-end bearing pedestal to prevent prevent from jumping. HP-IP outer cylinder connects with front-end bearing pedestal and #1 LP cylinder valve control end bearing pedestal through “H” centering beam on both sides. sides. “H” centering beam beam plays push-pull role in cylinder expansion and guarantees the center of the cylinder and shaft system to remain unchanged. HP-IP outer cylinder supports on keys of front-end bearing pedestal and #1 LP cylinder valve control end bearing pedestal through 4 turbine bracket support keys. The paw bracket is of suspended structure, and the supporting surface and the casing split are one plane so as to avoid cylinder deviation from central position caused by the paw bracket. The radial bearings of HP-IP rotor and LP rotor are tilting-pad bearings, with good stability to prevent from oil whip. The thrust bearings can automatically regulate thrust loads of each pad to realize the same thrust for each pad. In addition, through the positioning mechanism of thrust bearing shell, the clearance of thrust bearings can be measured and adjusted. The rigid couplings are used to connect HP-IP rotor and LP rotor as well as two LP rotors. The gasket is installed between two couplings, and when installed, the axial position can be adjusted. The rigid couplings are also used to connect LP rotor and generator rotor. The LP rotor motor end is equipped with large barring gear. gear. The gear is also taken as the coupling gasket to adjust the axial position of steam turbine rotor and generator rotor. Steam Turbine Operation Manual Page 2 of 197


Barring device at startup can automatically release, and it can manually or automatically operate for continuous barring. 1.2

Technical specifications specifica tions on steam turbine proper Table 1.2-1

No. I

Item

Unit

Data

Unit performance specification specificati on Subcritical, primary reheating,

1

Unit type

three-cylinder four-exhaust, single-shaft, condensing

2

Steam turbine model

3

RO working condition

4

Rated main steam pressure

5

Rated main steam temperature

6

Rated HP cylinder exhaust pressure

7

Rated HP cylinder exhaust temperature

8

Rated reheat steam inlet pressure

9

N622-16.67/538/538 MW

622.819

Mpa (a)

16.67

℃

538

Mpa(a)

4.069

℃

332.2

Mpa(a)

3.622

Rated reheat steam inlet temperature

℃

538

10

Rated steam inlet quantity of main steam

t/h

1939.242

11

Rated steam inlet quantity of reheat steam

t/h

1643.073

12

Rated exhaust pressure

MPa(a)

0.007

13

Steam distribution distribu tion mode

14

Design cooling water temperature

℃

15

Rated feed water temperature

℃

280.2

16

Rated speed

r/min

3000

17

Heat consumption rate

kJ/kWh

8026

kcal/kWh

1917

Nozzle+ throttle

Feed water regeneration stages 18

(high-pressure heater+ deaeration+

3+1+4

low-pressure heater) 19

LP last stage blade length

20

21

22

mm

905

Total internal efficiency of steam turbine

%

89.35

HP cylinder efficiency

%

86.92

IP cylinder efficiency

%

90.81

LP cylinder efficiency

%

89.82

HP cylinder

Stage

1+9

IP cylinder

Stage

6

LP cylinder

Stage

2X2X7

r/min

1540/1460

Flow path stage

Critical speed (first-order, second-order test valve by shaft system, shaft segment ) HP rotor

Steam Turbine Operation Manual Page 3 of 197


No.

23 24

25

Item

Unit

Data

IP rotor

r/min

1580/1550

LP rotor

r/min

1660/1550

Generator rotor

r/min

Unit shafting torsion frequency Unit external dimensions (length, width, height) If the Unit is subject to overall assembly and thermal test before leaving the factory

810/2180 763/2200

Hz

18.1,23.2,88.8,89.5,111.1,128.7,131.5 18.1,23.2, 88.8,89.5,111.1,128.7,131.5,131.6 ,131.6

m

26*11*7.9

Yes/No

Overall assembly barring

26

Operating floor elevation

m

13.7

27

Maximum lifting height

m

~11

28

Service life consumption Cold startup

%/times

0.01

Warm startup

%/ times

0.008

Hot startup

%/ times

0.005

Extreme hot startup

%/ times

0.0025

Step load >10% rated load (TH1)

%/ times

0.0025

29

30

31

32

HP cylinder startup or HP-IP cylinder

Startup mode Load range under variable pressure operation Fixed pressure, variable pressure load variation rate Maximum

at two directions of journal

vibration

combined startup %

30-90

%/min

5/3/2

mm

0.076

mm

0.15

kPa(a)

18.6

℃

120

33

Axial vibration maximum at critical speed

34

Maximum allowable back pressure

35

Maximum allowable exhaust temperature

36

Noise level

dB(A)

90

40

Sealing system in shaft seal

Yes/No

yes

II

Steam turbine performance guarantee Nameplate rating (RO)

MW

622.819

Rating under capacity condition (TCC)

MW

600

kJ/kWh

8026

kcal/kWh

1917

kJ/kWh

8159

kcal/kWh

1948.7

mm

0.076

dB(A)

85

Heat rate under RO working condition

Heat rate under 75%RO working condition Journal vibration Noise (conditions (conditions same same as 3.1.5)



Steam turbine performance data Table 1.2-2

Output kW

High-pressure

VWO

TCC

RO

working

working

working

condition

condition

condition

647064

600005

622819

467140

311630

249355

186909

622701

600264

8024

8315

8026

8159

8505

8746.8

9127.3

8133

7763.9

16.67

16.67

16.67

16.638

11.24

9.197

7.715

16.67

16.67

3.783

3.615

3.622

2.675

1.818

1.481

1.144

3.697

3.476

538

538

538

538

538

538

538

538

538

538

538

538

538

538

524

500

538

538

2033322

1939269

1939242

1396926

923015

749448

580487

1845780

2003386

1717783

1633720

1643073

1206516

813991

662208

520305

1679618

1588950

7.0

10.0

7.0

7.0

7.0

7.0

7.0

7.0

1208886

1152759 1152759

1163576

879083

753412

523241

418564

1173366

0

3

0

0

0

0

0

0

0

283.2

280.3

280.2

259.8

237.4

226.4

213.4

250.8

280.1

75%

50%

40%

30%

heater

RO

RO

RO

RO

shutdown condition

Plant steam condition

Turbo-generator heat consumption rate kJ/kWh Main steam pressure MPa MPa (g) Reheat steam pressure MPa MPa (g) Main steam temperature ℃ Reheat steam temperature ℃ Main steam flow kg/h Reheat steam flow kg/h Exhaust pressure kPa kPa Steam discharge kg/h Makeup water rate %

7.0

1040819

Last-stage high-pressure heater outlet feed water temperature ℃



Turbine unit bearing pad Table 1.2-3

No.

Shaft diameter width

Bearing pad

mm

1

380*355

2

405*324

3

482.6*482.6

4

482.6*482.6

5

482.6*482.6

6

482.6*482.6

form

area cm

MPa

Threshold speed r/min

Design

Logarithmic

bearing pad pad

decrement

temperature ℃

1349

1.1

>4500

90

0.32

1312.2

1.21

>4500

90

0.32

2329

1.36

>4500

90

0.495

2329

1.42

>4500

90

0.495

2329

1.43

>4500

90

0.48

2329

1.39

>4500

90

0.48

2*1720

0.47

>4500

90

tilting pad

tilting pad

pressure

2

Four-pad

Four-pad

Specific

Stressed

Four-pad tilting pad Four-pad tilting pad Four-pad tilting pad Four-pad tilting pad

Outer diameter Thrust

Φ673/inner diameter

Tilting pad

Φ393.7

Steam extraction parameters at stages under steam turbine rated load (RO working condition) Table 1.2-4 Flow

Pressure

kg/h

MPa (a)

Stage 1 (to No.1 high pressure heater)

139858

6.466

394.2

2


136695

4.069

332.2

3

Stage 2 (to plant steam)

-

-

-

4


70224

2.190

463.4

5

Stage 4 (to deaerator)

96520

1.125

367.8

6

Stage 4 (to feed water pump turbine)

67872

1.125

367.8

7

Stage 4 (to plant steam)

-

-

-

8

Stage 5 (to No.5 low pressure heater)

107944

0.4649

261.2

9


53284

0.1236

129.1

10


48051

0.05484

83.67

11


45446

0.02320

63.33

No.

Steam extraction extraction stages stages

1


Temperature ℃

Allowable maximum steam extraction (simultaneous) (simultaneous )

100000

80000

kg/h


Critical speeds of steam turbine generator unit (by shaft system, shaft segment) Table 1.2-5 No.

First-order First-or der critical speed r/min

Shaft segment

Second-order critical speed r/min

name

Design value

1

HP-IP rotor

1540

>4000

2

LP rotor Ⅰ

1580

>4000

3

LP rotor Ⅱ

1660

>4000

4

Generator rotor

810

2180

Test value

Design value

Test value

Rotor journal double-amplitude vibration amplitude (μm) (μm) Table 1.2-6 Bearing

Vibration speed at rated speed

Vibration amplitude at the first critical speed

Normal

Alarm

Trip

1

150

76

127

254

2

150

76

127

254

3

150

76

127

254

4

150

76

127

254

5

150

76

127

254

6

150

76

127

254

Closing time of steam turbine valves (s) Table 1.2-7 No.

Valve name name

1

Time characteristic Closing time (s)

Delay time (s)

Main steam valve

0.15

0.15

2

Steam regulating valve

0.15

0.15

3

Reheat main steam valve

0.15

0.15

4

Reheat regulating valve

0.15

0.15

Startup mode, working condition and time (min) Table 1.2-8

Starting state

Rolling mode

Time

Time for

rolled to

rated speed

rated

to gird

speed

connection

Time for grid connection to rated load

Time rolled to rated load

Steam

Steam

HP cylinder

pressure

temperature

stage 1 metal

(MPa.a)

(℃)

temperature( ℃)

HP cylinder, IP Cold

cylinder,

state

combined HP-IP

<120 82

25

132

239

4

340

Long-term shutdown

cylinder rolling



Starting state

Rolling mode

Time

Time for

rolled to

rated speed

rated

to gird

speed

connection

Time for grid connection to rated load

Time rolled to rated load

Steam

Steam

HP cylinder

pressure

temperature

stage 1 metal

(MPa.a)

(℃ )

temperature( ℃) 120-415

Warm

Same as above

state

10

4

121

135

7

360

Shutdown 10-72 hours 415-450

Hot

Same as above

state

10

4

46

60

9

490

Shutdown 1-10 hours

Extreme hot state

Same as above

10

4

21

35

10

510

>450

Running parameters Table 1.2-9 No.

Item

Unit

Data

1

Idling time without vacuum breaking

min

~65

2

Idling time with vacuum breaking

min

~40

3

Maximum load under no overspeed trip at main switch turnoff

kW

647064

4

Overspeed tripping speed

r/min

3300

5

Maximum running back pressure

kPa(a)

18.6

6

Alarming turbine back pressure

kPa(a)

18.6

7

Tripping turbine back pressure

kPa(a)

20.3

8

Turbine spray water flow

t/h

6.48

9

Maximum continuous allowable load (at back pressure 0.0186MPa (a) )

kW

600000

10

Maximum allowable exhaust pressure (at rated load)

kPa(a)

18.6

11

Barring speed

r/min

2.38

12

Maximum cylinder temperature allowed for barring stoppage

℃

150

Note: the coordinate system system is defined as follows, X-the direction from steam turbine to generator as positive direction; Y-the direction from turbine room to boiler room as positive direction; Z-the vertical upward direction as positive direction 1.3 1.3.1

Specifications on steam turbine auxiliary unit HP, HP, LP bypass system



1.3.1.1 1.3.1. 1 No.

HP, HP, LP bypass system Technical specifications specifications Inlet steam pressure Inlet temperature HP

1

bypass valve

Inlet steam flow Outlet steam pressure Outlet steam

BMCR working

Cold

condition

startup

MPa

17.6

℃

Unit

Hot startup

5.9

5.9

7

8

538

340

340

450

485

t/h

1236

225

260

350

350

MPa

4.014

1.1

1.1

1.1

1.1

℃

328.7

185

185

185

185

t/h

1432.8

252.87

252.87

390.96

401.66

temperature Outlet steam flow

2

Pressure

MPa

20.4

spray

Temperature

℃

188.5

regulating

Calculated

valve

flow

t/h

196.8

27.87

27.87

40.96

51.66

MPa

4.616

1.045

1.045

1.045

1.045

℃

538

300

300

435

470

t/h

1432.8

252.87

252.87

390.96

401.66

MPa

0.6

0.6

0.6

0.6 0.6

0.6

℃

160

160

160

160

160

t/h

1864.78

280.64

280.64

479.41

509.32

3.1

3.1

3.1

3.1

27.77

27.77

88.45

107.66

pressure Inlet temperature LP bypass valve

Inlet steam flow Outlet steam pressure Outlet steam temperature Outlet steam flow

4

startup

HP water

Inlet steam

3

Extreme hot

Warm startup

LP water

Pressure

MPa

3.3

spray

Temperature

℃

45.7

regulating

Calculated

valve

flow

t/h

410



1.3.1.2

Hydraulic actuator HP bypass Water

No

Name

.

HP bypass

spray

valve

regulating valve

HBSE280-350-

1

Model

2

Type

Angle-type

3

Driving mode

Hydraulic

4

State after power loss

FailtoLock

5

Upstream

1

Mp

Pressure

a

Temperature

6

7

8

Downstrea m

C

Mp

Pressure

a

Temperature

Maximum pressure difference

Flow

o

o

C

Mp a

NBSE60-700 NBSE60-700-

regulating valve

ES45-3SF

HA56-A2

Angle-typ

Through-typ

e

e

Hydraulic

Hydraulic

Hydraulic

Hydraulic

FailtoLock

FailtoOpen

FailtoOpen

FailtoLoc k

2 Angle-type

840H 3” Through-typ e

17.6

22.21

24.1

4.85

2.63

546

181.5

181.5

546

43.1

4.85

5.47

21.48

0.8

1.31

358.1

181.5

181.5

185

43.1

17.5

21.38

24

4.75

2.53

210.75

209.96

870.875

245,32

Maximum value

t/h

1783

282

-

1740

282

linear

=%

On/off

linear

=%

mm

199.7

48

50

402.9

50

kN

80

mm

175

45

40

300

80

Valve body material

F91

G20Mo5

G20Mo5

F91

WCB

Leakage rate (or class)

V

V

V

V

V

BWE

BWE

BWE

BWE

BWE

F91/F22

G20Mo5

G20Mo5

WC9/F22

WCB

mm

ID 387x41

DN150

DN150

ID 679x39

DN140

mm

ID 762x20.62

DN150

DN150

DN1220 x12

DN140

kg

1500

210

330

3000

190

diameter Required thrust Valve stem stroke

valve

valve

valve

Water spray

1531

Valve seat

related to

isolating

LP bypass

t/h

characteristics

9

Water spray

Rated value

Flow

Parameters

LP bypass

Connection method Material

Interfac e

Inlet Outle t Weight



1.3.1.3

Cylinders of bypass valve and water spray valve HP bypass cylinder

No.

Name

Unit

HP

Water spray sp ray

bypass

regulating

valve

valve

CCI－

LP bypass cylinder

Water spray sp ray

LP bypass

Water spray sp ray

isolating valve

valve

regulating valve

CCI－

CCI－Sulzer

CCI－Sulzer

GHZ100

GHZ100

GHZ100

GHZ80

GHZ50

MPa

16

16

16

16

16

Diameter

mm

100

80

80

80

50

5

Area

mm2

7150

7150

7150

4320

1650

6

Force

N

115752

115752

115752

69000

26380

7

Stroke

mm

175

45

60

300

50

Full

Quick opening

1

-

-

-

-

range of

Quick

action

closing

-

-

-

time

Regulating

10

10

10

1

Manufacturer

2

Model

3

Oil pressure

4

1.3.1.4 No.

1

2

Sulzer

Sulzer

Water spray s pray isolating valve

CCI－Sulzer

10

10

Devices at HP bypass oil station Device name name

Oil pump

Oil tank

Item

Unit

Value

Model

11ccm/u55

Type

Gear

Number of sets

set

2

Rated oil pressure

MPa

16

Rated flow

l/min

267

Rotating speed

r/min

1500

Manufacturer

BOSCH

Model

HA-250-28.5-28.5-200

Number of of sets

set

1

Working pressure

MPa

20

Geometric volume

l (liter)

300

Maximum oil storage

l (liter)

280

External dimensions

mm

1500*1200*600

Weight

kg

1500

Model 3

Filter

Filter screen material Filter screen accuracy

Stainless steel μm

10



No.

Device name name

Item

Unit

Value

MPa

0.6

External dimensions

mm

100*200

Weight

kg

Allowable pressure difference

4

5

Oil pump motor

Accumulator

Model Number of of sets

set

2

Power

kw

7.5

Voltage

V

400

Frequency

Hz

50

Rotating speed

r/min

1500

Number of of sets

set

5

Capacity

L/set

50L

Working pressure

MPa

Model & specification

Safety valve action

MPa

pressure

1.3.2 1.3.2.1

Buffer system/pressure system/pressu re

/MPa

Nitrogen/12.6 Nitrogen/12. 6

Outage duration

Minute

~60min

Main engine lubricating oil system Main engine lubricating oil tank

No.

Name

1

Oil brand, oil quality standard used

2

Oil quantity required for oil system

3

Bearing oil circulation ratio

4

Bearing oil pressure

5

Combined oil tank

6

Type

7

Capacity

8

External dimensions (length* width* height)

Unit

Value #32 turbine oil, GB11120-89

m3

38 ~8

MPa(g)

0.096~0.124

Horizontal m3

48.4

mm*mm*mm

7020*3260*3600

MPa(g)

0.5

9

Design pressure

10

Material

11

Oil tank weight

kg

12700

12

Oil return flow

m3

320

Unit

Value

1.3.2.2 No.

Carbon steel

AC lubricating oil pump Name

AC lubricating oil pump Steam Turbine Operation Manual Page 12 of 197


No.

Name

Unit

Value

1

Type

Vertical

Centrifugal

2

Manufacturer

3

Quantity

set

1

4

Capacity

m3/h

320

5

Outlet pressure

MPa(g)

0.33

6

Rotating speed

r/min

1450

7

Shell

ZG25

8

Shaft

45

9

Impeller

ZcuZn16Si4

Zhuozhou Pump Plant

AC lubricating oil pump motor 1

Model

YBZ-250M-TH

Explosion-proof Explosion-pro of

2

Capacity

kW

55

3

Voltage

V

400

4

Rotating speed

r/min

1450

5

Total weight

kg

~1500

Unit

Value

1.3.2.3 No.

DC lubricating oil pump Name

DC lubricating oil pump 1

Type

Vertical

Centrifugal

2

Manufacturer

3

Quantity

set

1

4

Capacity

m3/h

320

5

Outlet pressure

MPa(g)

0.33

6

Rotating speed

r/min

1500

7

Pump shell

ZG25

8

Shaft

45

19

Impeller

ZcuZn16Si4

Zhuozhou Pump Plant

DC lubricating oil pump motor 1

Model

ZDB-91T-L3-TH

DC

2

Capacity

kW

55

3

Voltage

V

220(DC)

4

Rotating speed

r/min

1500

5

Total weight

kg

~1600

1.3.2.4

Barring device

No.

Name

1

Type

2

Motor capacity

Unit

Value YH250M-6

kW

37 Steam Turbine Operation Manual

Page 13 of 197


3

Motor voltage

V

400

4

Motor rotating speed

r/min

930

5

Barring speed

r/min

2.38

1.3.2.5

Lubricating oil cooler

No.

Name

Unit

Value

1

Type

2

Manufacturer Manufacturer

3

Quantity

set

2

4

Cooling area

M2

Tentatively 380

5

Cooling water inlet design temperature

℃

33

6

Oil pressure in oil cooler

MPa(g)

>0.25

7

Outlet oil temperature temperature

℃

45~49

8

Cooling water flow

m3/h

~825

9

Oil quantity

m3/h

320

10

Tube resistance

MPa(g)

0.06

Φmm*mm Φmm*mm

Tentatively 16*0.4

11

Tubular STW

Tube size (outer diameter* wall thickness)

12

Tube side (design pressure )

MPa(g)

0.4

13

Shell side (design pressure )

MPa(g)

0.4

14

Tube side (design temperature)

℃

93

15

Shell side (design temperature)

℃

93

16

Tube

Ti

17

Shell

Carbon steel

18

Water chamber

Carbon steel

19

Tube sheet

Carbon steel

20

Tube sheet size (outer diameter* wall thickness)

21

Total weight per set

1.3.2.6

Jacking oil pump

No.

Name

Φmm*mm Φmm*mm

φ816* φ816 *85/φ904*85 85/φ904*85

kg

~16000

Unit

Value

Jacking oil pump 1

Type

Piston pump

2

Manufacturer

3

Quantity

set

2

4

Capacity

m3/h

6.3

5

Outlet pressure

MPa(g)

16

6

Rotating speed

r/min

1500

Qidong Shenli High Pressure Oil Pump Factory



No.

Name

Unit

Value

7

Shell

Carbon steel

8

Shaft

45

9

Piston

35CrMo Jacking oil pump motor

1

Type

2

Capacity

kW

45

3

Voltage

V

400

4

Rotating speed

r/min

1480

5

Current

A

80.5

Unit

Value

1.3.2.7


Main oil tank exhaust fan

No.

Name

Exhaust fan 1

Type

Centrifugal

2

Manufacturer

3

Quantity

set

2

4

Capacity

m3/h

1260

Hangzhou Kexing Blower Co., Ltd.

Exhaust fan motor 1

Type

2

Capacity

kW

5.5

3

Voltage

V

400

4

Rotating speed

r/min

2950

15

Total weight

kg

~224

1.3.2.8


Air, hydrogen side seal oil

No.

Seal oil pump pump Item

Air side AC, DC seal oil pump

1

Model

HSNH160-40Z

2

Type

Screw pump

Screw pump

3

Flow

2*140 L/min

2*25.5 L/min

4

Outlet pressure

1MPa

1MPa

5

Shaft power

22 KW

5.5 KW

6

Manufacturer

HUANGSHAN INDUSTRY

HUANGSHAN INDUSTRY PUMP-MAKING

PUMP-MAKING CO., LTD.

CO., LTD.

Item

Air side AC oil pump motor

Hydrogen side AC oil pump motor

Model

3-MOT12-160-4

3-NC12-100L-4

1

Hydrogen side AC seal oil pump



No.

Seal oil pump pump

2

Power

22KW

5.5KW

3

Voltage

400V

400V

4

Current

44.5 A

11.1 A

5

Rotating speed

3000 r/min

1450 r/min

Manufacturer

Shanghai Shenfu Motor Co., Ltd. Air side DC oil pump motor

1

Model

ZPL4-160-4

2

Power (kW)

22KW

3

Voltage

220V

4

Current (A)

113.7 A

5

Rotating speed

3000 r/min

6

Manufacturer

1.3.3 1.3.3.1

Fire resistant oil system Fire resistant oil tank and oil pump

No. 1

Name

Unit

External dimensions of fire resistant oil pump unit and oil tank

mm*mm*mm

Value 2000X1830X2450

2

Oil quantity for fire resistant oil system

kg

200

3

System reserved capacity

kg

940

4

Fire resistant oil design pressure

MPa(g)

13.9

5

Fire resistant oil reserves

m3

1.14

6

Fire resistant oil brand

Reolube 46XC

7

Fire resistant oil quality standard

NAS 5/SAE 2

8

Fire resistant oil pump

DENISON PV29

9

Type

Piston pump

10

Quantity

Set

11

Capacity

m3/h

12

Outlet/inlet pressure

13

Motor

Y200L-4

14

Type

Three-phase AC asynchronous motor

15

Capacity

kW

30

16

Voltage

V

400

17

Rotating speed

r/min

1470

18

Total weight

kg

270

MPa(g)


2 5.4 14/0.1


1.3.3.2

Fire resistant oil accumulator

No.

Name

1

Accumulator

2

Type

3

Quantity

4

Nitrogen charge pressure

1.3.3.3

Unit

Value

Bag type Set

1+4(HP) +4(LP) 9.3(HP) ,0.21(LP)

Fire resistant oil cooler

No.

Name

Unit

Value

1

Type

2

Quantity

Set

2

3

Cooling area

m2

4.5

4

Tube side (design pressure )

MPa

1.6

5

Shell side (design pressure )

6

Tube side (design temperature)

℃

7

Shell side (design temperature)

℃

8

Tube

Stainless steel

9

Shell

Stainless steel

10

Water chamber

Stainless steel

11

External dimensions (diameter * length)

1.3.4

Tubular

0.2 Water temperature inlet 38 outlet 42.2 Oil temperature inlet 61.8 outlet 51.7

Φmm*mm Φmm*mm

Φ235m*920mm Φ235m*920mm

Auxiliary heating and HP/LP heater system

1.3.4.1

Auxiliary steam header

No.

Name

1

Volume

2

Working pressure

3

Working temperature

4

Maximum working pressure

1.3.4.2

Unit

Value

m3

1.25

Mpa

0.9~1.1

℃

245~340

Mpa

1.25

High pressure heater

No.

Name

Unit

Value

1

Item

#1 HP heater

#2 HP heater

#3 HP heater

2

Model

JG-1745-3-3

JG-2231-3-2

JG-2063-3-1

3

Type

4

Manufacturer

5

Heat exchange area

6

Shell side design pressure

Horizontal U-type tube, hemispherical water chamber Shanghai Electric Group Company m2

2063

2231

1745

MPa

7.8

4.9

2.7



No.

Name

Unit

Value

℃

425/295

360/265

492/228

MPa

28

28

28

℃

315/295

285/265

248/228

Shell side test pressure

MPa

11.7

7.35

4.05

11

Tube side test pressure

MPa

42

42

42

12

Flow

t/h

1868.97

1868.97

1868.97

13

Inlet temperature

℃

243.5

204.6

178.6

14

Outlet temperature

℃

272.3

243.5

204.3

15

Heating steam flow

t/h

69.82

141.45

124.76

16

Heating steam pressure

MPa

5.562

3.559

1.709

17

Heating steam temperature

℃

380.0

319.3

445.3

18

Drainage temperature

℃

257

222

194

7

Shell side design temperature

8

Tube side design pressure

9

Tube side design temperature

10

1.3.4.3

Low pressure heater

No.

Name

Unit

Value

1

Item

#5 LP heater

#6 LP heater

#7 LP heater

#8 LP heater

2

Model

JD-1400-5-1

JD1200-1-2

JD-735-11-2

JD-872-11-1

3

Type

4

Manufacturer

5

Heat transfer area

m2

1400

1200

735

872

6

Shell side design temperature

℃

280

200

130

90

7

Shell side design pressure

MPa

0.6

0.6

0.6

0.6

8

Tube side design temperature

℃

280

140

120

90

9

Tube side design pressure

MPa

4.7

4.7

4.7

4.7

10

Condensed water flow

t/h

1568.46

1568.46

784.23

784.23

11

Heating steam flow

t/h

53.73

52.76

31.48

34.715

1.3.4.4

Horizontal U-type tube, hemispherical water chamber Shanghai Electric Group Company

Gland heater

No.

Name

1

Type

2

Design pressure (tube side)

3

Design temperature (tube

Unit

No.

Name

8

Model

4.7 MPa

9

Design vacuum pressure (shell side)

0.3 MPa

90 ℃

10

Design temperature

300 ℃


Unit


side) 4

(shell side)

Maximum working pressure (tube side)

5

Cooling area

6

Cooling water quantity

7

Cooling pipe quantity

1.3.4.5

Maximum working pressure

4.0 MPa

11

150 m2

12

Steam side flow

1.46 t/h

1568.46 t/h

13

Cooling pipe size

25*1.0 mm

14

Pipe

Stainless steel

(shell side)

0.095 MPa

Axial fan

No.

Name

Unit

No.

Name

Unit

Axial fan 1

Model

2

Total pressure

3

Manufacturer

17Y30-1000

4

Prime mover power

11KW

3 kPa

5

Flow

1800 m3/h

6

Rotating speed

2930 r/min

Axial fan motor 1

Model

Y2-160M1 －2

5

Power

11 kW

2

Voltage

400V

6

Current

21.3A

3

Rotating speed

2930 r/min

7

Insulation class

4

Manufacturer

1.3.5 1.3.5.1

Condensate system Condenser

No. 1

F

Name Model

Value

No.

N-33000

Name Cooling area

Value 33000 m 2

Double back pressure 2

Type

double shell

Cooling water

single-pass surface

quantity

28.7m3/s

condenser 3

Mean back pressure

4

Condensate depression

5

6

Total number of condenser copper tubes Cooling water temperature

Water chamber cha mber

7KPa (a)

design pressure Condenser terminal difference

41248

Cooling medium

27.6 ℃

Manufacturer

0.4MPa(g)

(LP) / (HP)

Seawater SEPG Auxiliary Equipment Plant



1.3.5.2

Condensate pump

No.

Name

Value

No.

Name

Value

Condensate pump 1

Type

2

Pump lift

3

Flow

4

Manufacturer

Vertical barrel pump

5

Model

339 m

6

Seal type

1708 m3/h

7

Ebara Boshan Pumps Co., Ltd

8

80*400VYDB4M Mechanical seal

Net positive suction

4.4

head Rotating speed

1490r/min

Condensate pump motor 1

Model

YLBT630-4

5

Power

2200 kW

2

Voltage

6.6KV

6

Current

221.1A

3

Rotating speed

1500r/min

7

Power factor

4

Manufacturer

8

Insulation class

1.3.5.3

Factory

F

Deaerator

No.

Name

1

Model

2

Design pressure

3

Shanghai Electric Group Shanghai Motor

0.9

Design temperature

Value

No.

GC-2135/GS-235 GC-2135/GS-2 35

8

1.4 MPa

9

405 oC

10

Name

Value

Type

Single-shell Single-shel l deaerator

Maximum working pressure Maximum working temperature

1.073 MPa(a)

367.4 oC

4

Total volume

397m 3

11

Effective volume

235 m 3

5

Rated output

2135t/h

12

Maximum output

2242t/h

6

Nozzle quantity

18

13

Nozzle flow

100 t/h

1.3 MPa

14

Manufacturer

7

1.3.6 1.3.6.1

Safety valve pressure

Shanghai Electric Power Generation Equipment Equipment Co., Ltd. (SEPG)

Feed water system Turbine-driven Turbine-driven feed water pump unit

No.

Name

Value

No.

Name

Value

Small turbine 1

Type

Single-shaft, single-cylinder, single-flow, impulse,

11


Rotating speed control scope

2800~6150 r/min


No.

Name

Value

No.

Name

Value

r/min

condensing, cold reheated steam/four stage steam extraction outer switch 2

Model

12

Barring speed

3

Control system

13

Rated working speed

14

Internal efficiency

83% 9.0MW

4

Rated steam consumption rate

5

Rated power

15

Maximum power

6

Exhaust pressure

16

Rotation direction

17

Electrical overspeed

7 8

Mechanical overspeed

Clockwise (from turbine head to pump) 6300r/min

Flow path stage First-order

9

5260r/min

Critical speed

2353r/min

Second-order 7213 r/min

Main steam, four-extraction, 18

Steam source

auxiliary steam three-way; HP: Mpa/℃ LP: Mpa/℃ Auxiliary steam: MPa/ ℃

10

Manufacturer

Shanghai Power Equipment Manufacture Manufacture Co., Ltd. Turbine-driven feed water pump

1

Type

Integral cartridge

7

Model

HPT300-330IIM-5S HPT300-330IIM -5S

2

Seal type

Mechanical seal

8

Rotation direction

3

Flow

1186 t/h

9

Pump lift (m)

2018 m

4

Input power

7929.74 KW

10

Inlet temperature

184.6 ℃

5

Minimum flow

233 t/h

11

Rotating speed

6

Efficiency

84.17%

12

Manufacturer

Clockwise from view of drive end

5553 r/min Shanghai Power Equipment Manufacture Manufacture Co., Ltd.

Small turbine oil system Small turbine AC lubricating lubricatin g oil pump motor

Small turbine DC lubricating oil pump motor

1

Model

YB200L2-2VI

6

Model

Z2-62

2

Power

37KW

7

Power

22KW

3

Voltage

400V

8

Voltage

220V

4

Rotating speed

2950 r/min

9

Rotating speed

3000 r/min

5

Insulation class

F

10

Insulation class

F

Small turbine AC lubricating lubricatin g oil pump 1

Flow

2

Pump lift

3

Rotating speed

4

Efficiency

5

Outlet pressure

Small turbine DC lubricating oil pump

50m3/h

1

Flow

95m

2

Pump lift

2950r/min

3

Rotating speed

61%

4

Efficiency

0.81MPa

5

Outlet pressure

50m3/h 40m 3000r/min 58% 0.35MPa Steam Turbine Operation Manual

Page 21 of 197


No.

Name

Value

No.

Name

Value

Booster pump of steam pump 1

Model

HZB253-640

5

Flow

2

Inlet temperature

3 4

1186 m3/h (BMCR)

184.6 ℃(BMCR)

6

Required NPSH

Pump lift (m)

136.3 m

7

Rotating speed

Efficiency (%)

83.51%

8

Manufacturer

6.22 m 1490 r/min Shanghai Power Equipment Manufacture Manufacture Co., Ltd.

Motor for booster pump of steam pump 1

Model

YKK450-4

6

Power

600kW

2

Voltage

6.6k V

7

Current

61A

3

Rotating speed

1490 r/min

8

Insulation class

4

Power factor

0.87

9

Connection method

5

Manufacturer

1.3.6.2

F

Shanghai Electric Group Shanghai Motor Factory

Motor-driven Motor-driven feed water pump unit

No.

Name

Value

No.

Name

Value

Main pump 1

Type

Integral cartridge

9

Model

HPT200-320M-5S

2

Seal type

Mechanical seal

10

Flow

895 t/h

3

Inlet temperature

184.6 ℃

11

Inlet pressure

2.45 MPa

4

Outlet pressure

21.55 MPa

12

Minimum flow

175 m3/h

5

Pump lift

1762.76 m

13

Tap discharge

30.62 m3/h

6

Tap pressure

13 MPa

14

Rotating speed

5501 r/min

7

Rotation direction

15

Efficiency(%)

83%

8

Manufacturer

Clockwise from view of drive end

Shanghai Power Equipment Manufacture Co., Ltd. Feed water pump motor

1

Model

YKS800-4

4

Power

6000 kW

2

Voltage

6.6KV

5

Current

595A

3

Rotating speed

1490 r/min

6

5

Model

FA1D56A

Booster pump 1

Type

2

Flow

895 m3/h

6

Pump lift

3

NPSH

4.73 m

7

Rotating speed

4

Manufacturer

88.37 m 1490 r/min(max)

Shanghai Power Equipment Manufacture Co., Ltd. Motor for electric pump AC auxiliary lubricating oil pump

1

Model

62008-2Z/C3

4


Power

5.5KW


No.

Name

2

Voltage

3

Rotating speed

Value

No.

Name

400V

5

Current

1460 r/min

6

Insulation class

Value 11.1A F

Hydraulic coupler 1

Model

2

Rated output speed

1.3.7

R17K.2E

3

Input speed

1490 r/min

5501 r/min

4

Speed range

25%~100%

Circulating water system

1.3.7.1

Circulating water pump

No.

Name

Value

No.

Name

Value

Circulating water pump 1

Model

96LKXA-20

7

Type

2

Flow

14.49 m3/s

8

Transmission medium

3

Pump lift

20 m

9

Rotating speed

4

Efficiency

88.1 %

10

Shaft power

5

NPSH

11.34 m

11

6

Rotation direction

Clockwise from bottom to up

12

Vertical mixed flow pump Seawater 295/270rpm 3322/2563.8 KW

Minimum submergence height

5m

Changsha Pump Works Co.,

Manufacturer

Ltd.

Circulating water pump motor 1

Model

YDLK1400-20/22

Power

3800kw/2900KW

2

Voltage

6.6KV

Current

A

3

Rotating speed

Insulation class

F

4

Power factor

5

Cooling method

1.3.7.2 No.

295/270rpm 0.72

Efficiency

Air-water cooling

94 %

Manufacturer

Cleaning machine and rotary sieve Name

Value

No.

Name

Value

Trash-cleaning machine

1

Device name

2

Cleaner quantity

3

Movable vertical

7

Device model

1 set

8

Trash rack quantity

Service depth

18.6m

9

Nominal trash rack width

4

Maximum flow rate

20m3/s

10

Motor model

YEJ132M2-6

5

Rated power

5.5 kW

11

Rated speed

960

scraper

YCB5500 2 sets 5500mm



No. 6

Name Rated voltage

Value

No.

400V

12

Name Rated current

Value 12.6A

Rotary sieve 1

Model

XKC-3500

10

2

Throughout rate

3

1.0m/s

11

Motor model

YD160M-8/4

13

Motor power

4

Rotating speed

750/1500r/min

14

Reducer model

5

Design throughout

18.5m 3/s

15

Number of nozzles for sieve

43

6

Speed ratio

289i

16

Sieve flushing water pressure

≥0.3MPa

17.99 r/min

17

600mm

18

7

Lifting height of largest component

8

Alarm level difference

9

Manufacturer

1.3.7.3

Water chamber depth

18.6m

Water level difference before and after sieve

200mm 5/7.5kW XWED5/7.5-95-289

Running-startup water level difference Rated current

200mm

13.9/15.2

Jiangsu TaiXing Reducer Factory

Rubber ball pump

No.

Name

Value

No.

Name

Value

1

Model

125JQ-27

8

Type

2

Flow

0,03 m3/s

9

Pump lift

27M

3

Required NPSH

10

Efficiency

65

4

Motor model

Y180M-4

11

Rated power

5

Rated voltage

400V

12

Rotating speed

6

Rubber ball material

Sponge

13

Rubber ball dry-state diameter

1.3.7.4

18.5KW 1460r/min 25mm

Open cooling water

No.

Name

Value

No.

Name

Value

Open cooling water pump 1

Model

SLOW600-560

5

Pump lift

2

Flow

3300 m3/h

6

Shaft power

3

Rotating speed

980 r/min

7

Efficiency

4

Manufacturer

20m 211.6 kW 79%

Shanghai Liancheng Co., Ltd. Open cooling water pump motor

1

Model

YKK400-6

4

Power

355 kW

2

Voltage

6.6KV

5

Current

31 A

3

Rotating speed

989 r/min

6

Insulation class


F


1.3.7.5

Closed cooling water

No.

Name

Value

No.

Name

Value

Closed cooling water pump 1

Model

SLOW350-400

6

Pump lift

60m

2

Flow

3000 m3/h

7

Rotating speed

980 r/min

3

Shaft power

551.1 kW

8

Efficiency

83.8 %

4

Inlet pressure

MPa

9

Inlet temperature

<80 ℃

5

NPSH

m

10

Manufacturer

Shanghai Liancheng Co., Ltd.

Closed cooling water pump motor 1

Model

YKK500-6

5

Power

450kW

2

Power factor

0.85

6

Current

76 A

3

Voltage

6.6KV

7

Rotating speed

993 r/min

4

Efficiency

95.1 %

9

Manufacturer

Shanghai Motor Factory

Closed cooling water heat exchanger 1

Model

2

Design temperature

3

Heat transfer area

1.3.8

4

Maximum design pressure

1.0/1.0 MPa

120 ℃

5

Maximum test pressure

1.5 times of design pressure

674.54 m 3

6

Manufacturer

SPX (Shanghai)

Flow

Technology Co., Ltd.

Water-ring vacuum pump and water-chamber vacuum pump

No.

Name

Value

No.

Name

Value

Vacuum pump 1

Model

Yz-355XB-12

2

Intake pressure

3

Manufacturer

4

Steam extraction

5

Rotating speed

>81.8kg/h 490

Tsurumi Vacuum Engineering (Shanghai)

Co., Ltd.

Vacuum pump motor moto r 1

Model

Y2-355XB-12

5

Voltage

400V

2

Power

160KW

6

Current

3

Insulation class

F

7

Rotating speed

4

Manufacturer

490r/min

Wuxi Huada Motors Co., Ltd. Water-chamber vacuum pump

1

Model

2

Manufacturer

3

Motor type/model

4

Rated speed

5

Full load current

6

Manufacturer

1.3.9 No.

2BE1 153-0BD4

8

Output

780t/h

Tsurumi Vacuum Engineering (Shanghai)

Co., Ltd.

Air cooling/Y180M-4 cooling/Y180M -4

9

Nameplate rating

30kW

1470 (r/min)

10

Rated voltage

400V

35.9 A Wuxi Huada Motors Co., Ltd.

Stator cooling water system Name

Value

No.

Name

Value Steam Turbine Operation Manual

Page 25 of 197


No.

Name

Value

No.

Name

Value

Stator cooling water pump 1

Type

2

Pump lift

3

Power

DFBII-125-80-250 DFBII-125-80- 250

4

Flow

80M

5

Rotating speed

6

Manufacturer

130 m 3/h 2099 r/min

Stator cooling water pump motor 1

Model

Y2-250M-2

4

Power

55KW

2

Voltage

220V

5

Current

95A

3

Rotating speed

2965 r/min

6

Manufacturer

1.3.10

Condensate transfer pump

No.

Name

Value

No.

Name

Value

Condensate transfer pump 1

Model

250AYS150C 250AYS150C

5

Condensate transfer pump

2

Flow

320m3/h

6

Pump lift

3

Rotating speed

2950 r/min

7

4

Manufacturer


8

Demineralized water storage tank

Power

AY centrifugal pump 100 m 300 m3

37kw

Condensate transfer pump motor 1

Model

Y2-315L1-2

5

Power

160 kW

2

Voltage

400V

6

Current

265A

3

Rotating speed

2980 r/min

7

Efficiency

0.954

4

Manufacturer

1.4


Regulating security system Solenoid valve under power loss: when oil switch appears tripping operation under over 30% of rated

load or the unit rotating speed exceeds 103% of rated speed, the regulating security system of the solenoid valve charged turbine can be divided into mechanical emergency governor, HP/LP interface device (diaphragm valve) , HP fire resistant oil system and steam turbine safety monitoring & protection system. 1.4.1 1.4.1.1

Latch The diaphragm valve is in close position, and AST solenoid valve on HP barring barring module is charged,

security oil pressure is provided to send signals to DEH, and the unit finishes the latch. 1.4.1.2

After mechanical mechanical emergency emergency governor and manual intercepting intercepting valve reset, reset, the lubricating lubricating oil on



upper of diaphragm valve can be provided to close the diaphragm valve 1.4.1.3

emergency governor, governor, emergency trip pilot valve.

The emergency governor is equipped with a set of centrifugal stop bolt (ram) to control an emergency trip pilot valve. When the working speed of steam turbine reaches 110%-112% of rated speed, centrifugal force of centrifugal stop bolt overcomes spring force, throwing the centrifugal stop bolt outward to strike emergency trip pilot valve trigger so as to move the emergency trip pilot to the right, so that the security oil is connected with drain to quickly open the diaphragm valve. The emergency trip pilot valve is the control and test device in emergency trip system. It is installed within front-end bearing box, including a trip pilot valve, a test isolating pilot valve, a manual trip lever and a test lever. The test isolating pilot valve can be used to isolate emergency trip pilot valve from LP security oil header. header. During oil injection test, the test stop valve can be opened manually to allow pressure oil to enter into centrifugal stop bolt lower chamber through nozzle, and centrifugal stop bolt overcomes the restriction force of spring and flies off. 1.4.1.4

Diaphragm valve

Diaphragm valve provides an interface between HP fire resistant oil and LP turbine oil, and LP overspeed trip can stop the unit through the diaphragm valve. 1.4.2

Trip The regulating security system of steam turbine is equipped with electric, mechanical and manual

redundancy tripping means. 1.4.2.1

Electric shutdown

This function can be accomplished through HP barring module. Once accepting electric shutdown signal, HP trip module loses the power, directly release HP security oil, quickly close main steam valves and regulating valves to stop the unit steam entering. 1.4.2.2

Mechanical overspeed protection

Mechanical emergency trip security system mainly includes emergency governor, emergency trip pilot valve, normally closed/open solenoid valve, throttle orifice and diaphragm valve accepting LP security oil pressure signals. Emergency governor and emergency trip pilot valve are installed at head part in front-end bearing box of steam turbine unit. Emergency governor is connected with lubricating oil pump drive shaft, integrated with turbine main shaft as one body to accept main shaft rotating speed signals. The emergency trip pilot valve is installed on bearing plate of drive shaft nearby emergency governor, and the clearance between valve damper and centrifugal stop bolt is about 1mm. When steam turbine rotating speed reaches (110-120%) rated speed, the centrifugal stop bolt flies off under action of centrifugal force with stroke 4mm, and strikes emergency trip pilot valve damper to release valve damper hook, and emergency trip pilot valve Steam Turbine Operation Manual Page 27 of 197


bounces upwards rapidly under action of bottom spring to open LP security oil leakage hole so as to discharge LP security oil line oil pressure quickly. The rapid reduction of security oil line oil pressure causes diaphragm valve to take action to discharge HP security oil and rapidly close main steam valve and regulating steam valve. 1.4.2.3

Manual shutdown

The system is equipped with manual intercepting valve in turbine head for emergency shutdown. Beat front-box manual tripping button with hand, discharge the lubricating oil on upper of diaphragm valve, and open diaphragm valve, discharge HP security oil, rapidly close main steam valves and regulating valves, and stop steams entering into the unit. (Reset before latch after stopping front-box tripping button manually) 1.4.2.4

The system is equipped equipped with emergency emergency governor test solenoid valve unit for oil spray test of

emergency governor. 1.4.3

HP fire resistant oil system

HP fire resistant oil system is composed of hydraulic servo system, HP fire resistant oil tripping system and oil supply system. 1.4.3.1

Hydraulic servo system is composed of valve valve control seat and servomotor. servomotor.

1.4.3.2

HP fire fire resistant oil tripping system is composed of diaphragm diaphragm valve which can transform transform from

lubricating oil to HP security oil and HP barring module which can realize online test. After the unit latches, the lubricating oil acts on diaphragm valve for action to intercept HP security oil return oil passage. If then solenoid valve on HP barring module is charged, HP security oil will be provided. 1.4.3.3

HP accumulator

HP accumulator is the hydro-pneumatic blade-type accumulator for 2 units, and nitrogen precharge pressure is 10MPa. HP accumulator accumulator is connected with the system through manifold block, including isolating valve, discharge valve, etc. It is used to supplement instantly increased oil consumption and reduce system oil pressure impulse. 1.4.3.4

HP barring module (AST)

HP barring module is mainly composed of four AST solenoid valves, two pressure switches, two throttling elements and one manifold block. On normal condition, all four solenoid valves are charged so as to provide HP security oil pressure pressure provided that the diaphragm valve valve is closed (namely (namely,, the unit latches)

to

keep valve servomotor unloading valve to a closed state. When it is required to stop the unit, all four solenoid valves lose power, HP security oil is discharged, and main steam valves and regulating valves are closed rapidly. 1.4.3.5

Overspeed limiting module (OPC)

Overspeed limiting module is composed of two pilot solenoid valves, two unloading valves and one-way valves. In normal operation, the solenoid valve loses power. When oil switch appears tripping operation Steam Turbine Operation Manual Page 28 of 197


under over 30% of rated load or the unit rotating speed exceeds 103% of rated speed, the charged solenoid valve acts to discharge oil pressure on unloading valve, open the unloading valve, discharge regulating valve servomotor security oil pressure and rapidly close regulating valve servomotor. The one-way valve is to discharge regulating valve servomotor security oil pressure when HP barring module acts and when overspeed limiting module acts, it cannot discharge main steam valve servomotor security oil, and will not close main steam valve. 1.4.3.6

Regulating valve servomotor

HP regulating valve servomotor belongs to servo actuator under continuous control, it can control HP regulating valve at any position and regulate steam admission according to control requirements so as to adapt to the operation need of steam turbine. The control principles of electro-hydraulic converter are same as those of HP main steam valve servomotor. This servomotor is equipped with a cartridge unloading valve. When the turbine speed exceed 103% of rated speed or it fails for emergency shutdown, the emergency tripping system acts to discharge overspeed protection (OPC)

header, header, rapidly open the cartridge unloading valve, rapidly discharge pressure oil in

actuator servomotor cylinder working chamber and rapidly close HP regulating valves under action of spring force. The principles of IP regulating valve servomotor is similar with those of HP regulating servomotor. 1.4.3.7 1.4.3. 7

HP, HP, IP main steam valve servomotor servomot or

HP main stop value (MSV) servomotor is a kind of servo actuator with continuous control. It can control the HP main steam valve at any position and adjust throttle flow to accommodate the operation of turbine according to the control requirements. Digital Electro-Hydraulic Control System (DEH) control signal drives electro-hydraulic drives electro-hydraulic servo servo valve to move main valve plug and controls the servo valve channel to make HP fire-resistant oil enter into the working chamber of the hydraulic servo-motor oil cylinder oil cylinder to move the hydraulic servomotor piston, driving and unlocking the main steam valve, or to leak pressure oil out from the working chamber of oil of oil cylinder cylinder to make the piston move backwards by relying on spring force and close the HP main steam valve. The movement of hydraulic servomotor piston drives the linear variable differential transformer (LVDT) to change the displacement of the piston into electric into electric signals signals.. These signals, as inverse feedback ones, adds to the former signals from computer processing; and with opposite polarity, they are actually subtracted from one another. After the addition of original input original input signals signals and and feedback signals cause the input servo amplifier signal equal to zero, the main servo valve returns to the neutral position with no more HP oil entering into servomotor cylinder working chamber. Thus, the HP main steam valve stops and stays at a new working position. Steam Turbine Operation Manual Page 29 of 197


An inserted inserted unloading unloading valve is installed to this hydraulic hydraulic servo-motor. servo-motor. When troubles take place and require an urgent halt, emergency stopping system (AST) starts to work and removes mother tube oil. Meanwhile, the inverted unloading valve quickly opens to quickly remove the pressure oil in the working chamber of the hydraulic servomotor cylinder cylinder and rapidly shut HP main steam valves under spring force. Two IP reheat MSV servomotors are installed on the unit side of IP main steam valve. The IP reheat MSV servomotor is a two-position switch-type actuator with solenoid valve for valve activity tests and oil cylinder possessing cylinder possessing adjustable buffering buffering function. The IP reheat MSV servomotor receives control signals from DEH control system. When an emergency takes places and removes the AST oil, the inserted unloading valve unloading valve on the servomotor unlocks immediately and removes the pressure oil in servomotor cylinder working chamber; meanwhile, the main steam valve rapidly closes under spring force. On the hydraulic servomotor, there is an activity testing solenoid valve (two-position two-way), connecting the working chamber of the oil cylinder and pressure return oil. When the activity test of main steam valve is carried out, DEH control system sends the signal to open this solenoid valve, removes a part of pressure oil in the working chamber of the oil the oil cylinder and closes the main steam valve under spring force to realize main steam valve test. 1.4.4

Steam turbine monitoring & protection instrument system

True Air speed Indicator (TSI) is a reliable multi-channel monitoring system, which can continuously monitor mechanical operating parameters of turbo generator unit rotor and cylinder. 1.4.4.1

Rotating speed monitoring

(1) Rotating speed and zero speed (2) The tachometer can continuously monitor the rotating speed of shaft. The rotating speed sensor is installed in the front bearing box. The tachometer receives the signal from the eddy current probe and calculates the revolutions per minute (RPM). When the rotating speeds drop to zero, an interlock signal will be sent to the automatic barring gear to activate the barring. The three rotating speed sensors of overspeed monitoring, installed on the speed detection gear of the front bearing box, detect the rotating speed of the unit. When the rotating speed of the steam the steam turbine turbine reaches 110% of the rated speed, two-out-of-three signal will be adopt to activate the relay and sent to the emergency trip system (ETS) to make 20-1/AST to 20-4/AST to interdict the power-loss open of the solenoid valve, leak out high-pressure safety oil and closing down the HP-IP automatic automatic main steam valve and the regulating valve. 1.4.4.2

Displacement monitoring

(1) HP-IP & LP differential expansion When HP-IP differential expansion is greater than or equal to +9.5mm or less than or equal to -4.0mm, and LP differential expansion is greater than or equal to +22.5mm or less than or equal to -0.26, the alarm Steam Turbine Operation Manual Page 30 of 197


relay takes action and outputs alarm signal, High Differential Differential Expansion I Value. When HP-IP differential expansion is greater than or equal to +10.2mm or less than or equal to -4.8mm, and LP differential differential expansion is greater than or equal to +23.3mm or less than or equal to -1.4, the alarm relay also takes action and outputs the alarm signal, High Differential Expansion Value Value II ; the steam turbine trips, otherwise, manually open the brake and switch off off the turbine. (2) Axial displacement and eccentricity The axial displacement adopts the two-channel monitoring. When #1 or #2 axial displacement is greater than or equal to +0.9mm or less than or equal to -0.9mm, - 0.9mm, and #1 or #2 “large axial displacement” displacement” alarm relay acts to output the alarm signal; when #1 or #2 axial direction displacement is greater than or equal to +1.0mm or less than or equal to -1.0mm, -1.0mm, #1 or #2 “shutdown due to excessive excessive large axial displacement” alarm relay takes action and sends signal to ETS causing machine halt; When the eccentricity is greater than or equal to original value 20µm, large eccentricity alarm relay acts and sends alarm signal. 1.4.4.3

Vibration Vibration monitoring

To monitor rotor radial vibration relative to the bearing, the unit #1-9 support bearings are equipped with horizontal (X direction) and vertical (Y direction) bearing vibration channels for 18 in total. When bearing vibration of #1-9 bearing bush X or Y direction is greater than or equal to 127μm, send the alarm “large steam turbine bearing vibration”; when it is greater than or equal to 50μm, send the alarm “large steam turbine bearing vibration” vibration ”; when it is greater than or equal to 254μm, 254 μm, send the alarm “large steam turbine bearing vibration”, vibration” , and send signals to ETS and act on tripping and shutdown when the rotating speed is greater than 2900rpm. 1.4.4.4 1.4.4. 4

Vacuum and oil pressure

The condenser low vacuum governor is only equipped with three vacuum switches, and lubricating oil low pressure governor is equipped with three pressure switches. (1) Condenser vacuum governor output signals When low condenser vacuum P is greater than or equal to 90Kpa (a) , vacuum pressure switch acts and outputs alarm signal; when excessive low condenser vacuum P is greater than or equal to 79.7Kpa (a) , three vacuum switches act (two-out-of-three) (two-out-of-three) , outputs alarm signal to ETS, and acts on tripping and shutdown. (2) Lubricating oil pressure governor output signals When the lubricating oil header oil pressure P is equal to or smaller than 0.082MPa, the pressure switch acts and outputs alarm signal; when the lubricating oil header oil pressure P is equal to or smaller than 0.049MPa, take two-out-of-three two-out-of- three logic, output alarm signal “shutdown due to low lubricating oil pressure”, send signal to ETS and act on tripping and shutdown. As the turbine shutdown after idling definitely enters into barring state, if the lubricating oil pressure declines constantly, when P is equal to or smaller than 0.031MPa, the pressure switch acts, output signal on stop barring and initiate the alarm. Steam Turbine Operation Manual Page 31 of 197


1.5

Steam turbine unit protection

1.5.1 1.5.1.1

Overspeed protection OPC overspeed limit (DEH)

When oil switch appears tripping operation under over 30% of rated load or the unit rotating speed exceeds 103% of rated speed, OPC charged solenoid valve acts to discharge HP-IP regulating valve servomotor security oil pressure and rapidly close HP-IP regulating valve. 1.5.1.2

AST overspeed protection (DEH)

When the unit rotating speed reaches 110% of rated speed, 20-1/AST-20-4/AST intercepts solenoid valve for power loss & open to discharge HP security oil, close HP-IP automatic main steam valve and regulating valve, and stop the turbine. (From DEH two-out-of-three overspeed overspeed protection signal) 1.5.1.3

Mechanical overspeed protection

The head part in front-end bearing box of steam turbine is equipped with a set of mechanical emergency emergency trip security system, including emergency governor, emergency trip pilot valve, normally closed/open solenoid valve, throttle orifice and diaphragm valve; emergency governor rotates with main shaft at same speed, and when steam turbine rotating speed reaches 110-120% 110-120% of rated speed, the centrifugal stop bolt flies off under action of centrifugal force and strikes emergency trip pilot valve damper to discharge emergency trip pilot valve LP security oil pressure rapidly. The rapid reduction of security oil pressure causes diaphragm valve to take action to discharge HP security oil, rapidly close HP-IP automatic main steam valve and regulating steam valve and stop the turbine. 1.5.1.4

Electric overspeed protection

When the unit rotating speed reaches 110% of rated speed, the signals from electric overspeed protection is sent to ETS so as to cause 20-1/AST-20-4/AST to intercept solenoid valve for power loss & open to discharge HP security oil, close HP-IP automatic main steam valve and regulating valve, and stop the turbine. 1.5.2

ETS (steam turbine emergency trip system)

ETS receives alarm or shutdown signal from TSI system or other system of turbine generator unit, makes logic processing and outputs indicator alarm signal or steam turbine trip signal. ETS will send shutdown command under the following circumstances: 1.5.2.1

HP cylinder protection

(1) The ratio of HP cylinder speed stage pressure to exhaust pressure is equal to or smaller than 1.7, the turbine appears tripping operation. (2) HP cylinder exhaust temperature temperature is greater than or equal to 427 ℃. 1.5.2.2

When the turbine overspeed is up to 3330rpm;

1.5.2.3

When the low condenser vacuum is 79.7Kpa;

1.5.2.4

When the axial axial displacement displacement is up to -1.0mm -1.0mm or +1.0mm;



1.5.2.5

When the excessive low lubricating oil pressure pressure is 0.048Mpa (two-out-of-three (two-out-of-three logic) ;

1.5.2.6

When the generator appears tripping operation;

1.5.2.7

When the boiler MFT acts;

1.5.2.8

When the low EH oil pressure pressure is 9.3 Mpa (two-out-of-four logic) ;

1.5.2.9

When DEH goes wrong (power loss) ;

1.5.2.10

When ETS goes wrong (power loss) ;

1.5.2.11

When bearing vibration of #1-9 bearing in X or Y direction direction is greater than or equal to 254μm;

1.5.2.12

When manually pressing shutdown button with backup backup hard hard hand-wheel; hand-wheel;

1.5.2.13

When generator appears oil/hydrogen differential pressure low protection;

1.5.2.14

When it appears remote control shutdown;

1.5.2.15

When it is steam turbine local shutdown device;



2.

Steam turbine unit startup

2.1

General principles on unit startup

2.1.1

Classification of unit startup states

Adopt combined HP-IP cylinder method for starting the unit. During initial six-month operation for the unit, the steam turbine shall adopt single-valve control mode and five startup states decided by HP cylinder stage 1 metal temperature. Cold startup: stage 1 metal temperature <120 ℃, after long-term shutdown; Warm-1 startup: 120℃≤stage 1 metal temperature<260 ℃, shutdown over 72 hours; Warm-2 startup: 260℃≤stage 1 metal temperature<415 ℃, shutdown for 10-72 hours; Hot startup: 415℃≤stage 1 metal temperature<450 ℃, shutdown for 1-10 hours; Extreme hot startup: 450℃≤stage 1 metal temperature, shutdown less than 1 hour. hour. 2.1.2

Under the following following circumstances circumstances listed in in 2.1.3, take measures to eliminate them, otherwise, do not not

start the unit. 2.1.3

Any trip and failure protection of steam turbine

2.1.3.1

When main meters cannot cannot be switched/input switched/input or fails, and there is no other monitoring monitoring means, such such

as unit load, rotating speed, axial displacement, differential expansion, rotor eccentricity, vibration, thermal expansion, main reheat stream pressure and temperature, vacuum, bearing metal temperature and oil return temperature, hydrogen purity, purity, oil/hydrogen differential pressure, cylinder main metal temperature, deaerator, condenser, condenser, main oil tank, EH oil tank level, lubricating oil pressure, EH oil pressure, oil temperature, etc. 2.1.3.2

When HP-IP HP-IP main steam valve, regulating regulating valve, HP exhaust check valve, valve, extraction check check valve

jam cannot be closed tightly tightly or act inflexibly. inflexibly. 2.1.3.3

When the rotor rotor eccentricity eccentricity exceed 110% of original original value. value.

2.1.3.4

When the differential differential expansion expansion or axial displacement displacement of turbine HP/IP/LP cylinder exceed the

limit. 2.1.3.5

In barring process, process, there is obvious metal friction sound in the unit dynamic/static dynamic/static part or barring

current obviously increases, significantly fluctuates. 2.1.3.6

When the temperature temperature difference difference of steam turbine HP outer cylinder upper and lower cylinder is

more than 50 ℃, and that of HP inner cylinder upper and lower cylinder is more than 35 ℃. 2.1.3.7

When turbine AC, DC lubricating lubricating oil pump, generator seal oil pump, pump, EH oil pump, jacking oil pump pump

or barring device goes wrong or auto-start device fails. 2.1.3.8

When DEH, DCS and and main control system cannot cannot work normally, normally, affecting unit operation operation and

monitor. 2.1.3.9 2.1.3.10

When control air source source or regulating regulating protection protection power is lost. When the unit appears tripping operation operation and the cause has has not been been found out. out.



2.1.3.11

When there is serious defect defect threatening threatening device device safe startup or safe operation. operation.

2.1.3.12

When steam, water, water, oil (turbine oil, fire resistant oil)

quality is not qualified, and oil temperature, temperature,

oil level are abnormal. 2.1.3.13

When generator seal oil system is abnormal.

2.1.3.14

When main automatic automatic control system (e.g. HP-LP HP-LP bypass system, system, shaft gland/seal pressure

regulating system, etc.)

goes wrong.

2.1.3.15

When the regulating system acts abnormally. abnormally.

2.1.3.16

When steam turbine proper and main pipeline pipeline are of incomplete incomplete thermal insulation, main pipeline pipeline

systems leak seriously. 2.1.3.17

When the system system has no startup measure after major alternation.

2.1.3.18

When the regulating regulating system system cannot operate operate under empty load or cannot control unit rotating rotating speed

below emergency emergency governor action action speed after load rejection. rejection. 2.1.3.19

When automatic automatic main main steam valve, regulating regulating valve valve is of unqualified unqualified leak test.

2.1.3.20 2.1.3. 20

When emergency governor acts abnormally. abnormall y.

2.1.3.21

When chilled chilled water system and and hydrogen system in generator cannot operate. operate.

2.1.4

Unit startup principles

2.1.4.1

Adopt combined HP-IP startup for steam turbine.

2.1.4.2

Steam turbine start/stop must follow shift supervisor’s order.

2.1.4.3

The following work must be carried out under leadership leadership of chief engineer or other persons persons

designated by the chief engineer. (1) Steam turbine unit startup after overhaul, minor repair. repair. (2) Unit actual overspeed test (3) Unit load rejection/shedding rejection/shedding test (4) First startup of main device or system after major alternation or first trial of relevant new technology (5) Particular test items 2.1.4.4

For cold startup, startup, the temperature of main and reheat reheat steam into into steam turbine at least has 56℃

superheat degree, but the maximum main steam temperature shall not exceed 430 ℃,the steam pressure and temperature before main, reheat steam valve shall meet requirement on “cold startup steam parametric curve”, and the rolling speed and warm-up time shall be decided according to cold startup curve. 2.1.4.5

For hot startup, the temperature of main and reheat steam into steam turbine turbine at least has 56℃

superheat degree, the rolling parameters and time shall be decided according to “hot startup steam parametric curve and startup working condition HP-IP cylinder inlet temperature ” based on the cylinder metal temperature.



2.2

Preparations before unit startup

2.2.1

After the shift supervisor sends order to start the unit, the foreman foreman shall notify notify the drivers drivers and relevant relevant

special person, and announce pre-control measures measures for danger points to relevant special person and sign it. 2.2.2

Prepare necessary necessary tools and instruments, instruments, allocate operations operations for different different posts, prepare prepare notebook,

operation ticket, etc. 2.2.3

Check all repair works have been accomplished completely completely,, working tickets have been recovered recovered

completely, all safety measures are removed, site cleaning is completed, device pipeline thermal insulation is complete, roads are smooth and the lighting is in good condition. 2.2.4

After device repair, repair, the operator operator shall understand and master master device repair, repair, improvement and

modification. 2.2.5

Check if the system system valve is of correct position and complete device.

2.2.6

Contact thermal thermal engineering personnel personnel to provide provide all thermal thermal meters and and protection power, power, check if if

DCS and DEH run normally, all parameter indications are correct, and the startup after overhaul & minor repair shall be in good condition accompanied with thermal engineering personnel calibration of instruments and protection static test. 2.2.7

Contact thermal engineering, electric electric personnel to supply power for regulating regulating valves and

motor-operated valves and switch test in good condition; for repaired motor-operated valve, the upper, lower stroke test shall be in good condition. Check DCS openness in conformity with local indication, and check if local control box, control panel signals are normal, and all indications are in good condition. 2.2.8

Contact boiler start start air compressor, compressor, check check if air source source of instruments and and pneumatic control valve is

normal, switch test of pneumatic control valve is in good condition, and DCS openness conforms to local indications. 2.2.9

Check running machine switches switches are in in off position position and interlock interlock switches in close position. Contract

electric personnel to supply the power after the insulation of running machine is measured to be qualified. 2.2.10

The water supply of condenser, condenser, deaerator and fixed fixed cold water tank, vacuum pump gas-water gas-water

separator is normal; main oil tank, fire resistant oil tank, HP-LP bypass oil station oil tank, circulating water pump outlet hydraulic check butterfly valve oil tank, feed water pump hydraulic coupler oil tank and generator seal oil tank oil level, auxiliary bearing makeup oil are normal; notify chemical personnel to test water quality, oil quality. 2.2.11

Input industrial industrial water system, check if industrial water pressure pressure is normal, normal, and input industrial water water

cooling users according to actual situations. 2.2.12

The interlock protection test test of main & auxiliary devices have been completed according to test

operation ticket before unit startup, and the test is qualified. 2.2.13

Check system pressure gauges primary valves are open.



2.2.14 2.3

Adjust system system safety safety valves valves on test bench bench after after repair. repair.

Test before startup

2.3.1

Test Test regulations

2.3.1.1

The device test, trial operation operation must be applied by the repairer in writing, and can can be implemented implemented

only after the shift supervisor agrees and sends the test order. 2.3.1.2

The device test is coordinated by the person person in charge charge of repair under cooperation of the operator at

presence of relevant relevant personnel. 2.3.1.3

Oil pumps and and others shall shall meet conditions of program program requirement, requirement, and before protection, protection, interlock interlock

test, the thermal engineering personnel shall meet relevant conditions and then carry out the test. 2.3.1.4

Dynamic test must be carried carried out only after after qualified qualified static test.

2.3.1.5

Do not test test the switched switched system and pressure motor-operated motor-operated valve, regulating valve. valve.

2.3.1.6

Test Test servo mechanisms mechanisms with close control/remote control/remote control, and arrange arrange special persons persons to record

start/close time and test conditions. 2.3.2

Test methods

2.3.2.1

Carry out close/remote-control full open/close test on all motor-operated motor-operated valves according to test

cards, keep openness indication in conformity with local indications, and test normal suspension on motor-operated motor-operated valve to be suspended. 2.3.2.2

Pneumatic regulating regulating device shall act flexibly, flexibly, free of any leakage and abnormality. abnormality.

2.3.2.3

The test for for interlock, protection inspection shall be carried out according to the specified specified test items

one by one. 2.3.3

Test items

2.3.3.1

Large unit interlock test

2.3.3.2

Steam turbine turbine AC lubricating oil oil pump, generator seal oil standby pump, steam turbine DC

lubricating oil pump interlock test 2.3.3.3

Small turbine main oil pump, lubricating lubricating oil pump interlock test test

2.3.3.4

EH oil pump interlock test

2.3.3.5

Jacking oil pump interlock test

2.3.3.6

Seal oil exhaust fan, fan, steam turbine lubricating lubricating oil exhaust fan fan interlock test

2.3.3.7 2.3.3. 7

Vacuum pump interlock interloc k test

2.3.3.8

Circulating pump interlock test

2.3.3.9

Close circulating cooling water pump interlock test

2.3.3.10

Condensate pump interlock test

2.3.3.11

Generator stator cold water pump interlock test

2.3.3.12

Electric pump, steam pump interlock test Steam Turbine Operation Manual Page 37 of 197


2.3.3.13

HP-LP heater and deaerator water level protection test

2.3.3.14

ETS channel test

2.3.3.15

OPC solenoid valve test

2.3.3.16

Main engine protection interlock test

2.3.3.17

Motor-operated Motor-operated valve, valve, pneumatic valve, regulating valve switch test test

The above tests are carried out after the unit overhaul and minor repair. Some test may also be carried out separately after repair according to the needs. 2.4

Steam turbine cold slide parameters startup

2.4.1

Check before startup

2.4.1.1

The unit has been repaired, and all working tickets tickets have been cancelled. cancelled.

2.4.1.2

Ladders, railings railings and platforms platforms shall be complete, complete, free of any obstacle preventing work and walking

around passages and devices. 2.4.1.3

Steam turbine proper is is complete in all parts; all systems shall be connected duly, duly, with firm pipeline

support & lifting and complete thermal insulation. 2.4.1.4

The lighting in the plant plant is good, and emergency emergency lighting system runs normally. normally.

2.4.1.5

The communication system in the plant runs normally normally..

2.4.1.6

Fire protection system system run normally, normally, fire protection facilities facilities are complete.

2.4.1.7

Steam turbine HP-IP HP-IP main steam steam valve, regulating regulating valve and control mechanism mechanism run normally normally..

2.4.1.8

Confirm steam steam turbine anchorage system system is complete, complete, and the cylinder cylinder body can freely expand.

2.4.1.9

Steam turbine LP LP cylinder safety valve is complete. complete.

2.4.1.10

For main oil tank tank emergency emergency discharge valve closure, add add lead sealing. Before Before starting the unit, unit,

record original parameters of main engine and main auxiliaries. 2.4.2

Auxiliary devices and system system operation operation before before steam steam turbine turbine startup startup

Input the following system and check their operation one by one according to check card based on relevant contents in Unit Auxiliary Device Start/Stop Start/Stop. When the systems are switched, consider the balance of load distribution at stages comprehensively. comprehensively. 2.4.2.1

Before boiler boiler ignition, input input the following following systems and check their operation operation one by one:

(1) Input fire fighting water system. (2) Input circulating water system including one circulating pump for running and one for standby, running water of condenser is normal. (3) Input close water system including one close cooling water pump for running, one for standby. standby. After cooler water injection and steam exhaust are finished, keep valve state in good condition. (4) Input plant air compressor system, under normal air pressure. (5) Input EH oil system. Steam Turbine Operation Manual Page 38 of 197


(6) Input main engine lubricating oil system, including one AC lubricating oil pump for running and DC lubricating oil pump for standby. Keep the bearing return oil normal, regulate automatically oil temperature, run oil cooler water side through water, and after standby oil cooler water side water injection, make the isolation. (7) Run generator seal oil air/hydrogen side AC seal oil pump, with DC seal oil pump for standby. Keep seal oil standby oil source in standby condition, input air/hydrogen side oil cooler, and control oil pressure, oil temperature, oil tank level, etc at various parts to be normal. (8) Replace hydrogen for the generator. generator. Input generator hydrogen system. (9) When generator charged hydrogen pressure reaches0.2Mpa, confirm water quality of feed water tank is qualified and stator air is exhausted, input generator chilled water system, including one stator water pump for running, one for standby. Control the pressure, temperature, water level and conductivity, etc. to be normal. (10) Start jacking oil pump, and check if jacking oil header pressure, jacking oil pressure of various bearings are normal. Confirm relevant interlock, protection test of the barring device in good condition, lubricating oil temperature over 21 ℃. Input continuous barring, check the barring current in good condition, free of any vibration. The unit rotating part has no metal friction sound, and rotor eccentricity shall not be greater than 110% of original value. Record relevant parameters. Guarantee continuous barring time before the turbine rolling shall not be less than 4 hours. (11) Input plant steam system, with normal header pressure and temperature. (12) Input condensate system. a. Start makeup pump, and inject water to the condenser. condenser. b. Confirm relevant interlock, protection test of the condensate water in good condition, and input condensate system, including one condensate pump for running and one for standby. After LP heater water side exhaust, water injection are finished, switch water level protection. c. Confirm condenser and system flushing water quality to be qualified, and supply water to the deaerator. deaerator. Confirm deaerator flushing water quality to be qualified. (13) Input oil system of two pneumatic feed water pumps, run oil cooler water side through water, isolate after standby oil cooler water side exhaust, switch oil temperature regulation to automatic. Before boiler ignition, small turbine barring barring operation lasts for over over 3 hours. (14) Switch deaerator water tank heating. a. Supply water to deaerator water tank to normal level, contact chemical personnel to make dosing to deaerator. b. Inject water to electric pump and its booster pump, meet startup conditions, place scoop tube to minimum position, start electric feed water pump for circulating. Steam Turbine Operation Manual Page 39 of 197


c. Confirm main engine barring operation is normal, start plant steam to deaerator regulating valve, switch deaerator heating. Regulate auxiliary steam to deaerator pressure regulating valve to rise deaerator water temperature gradually. (15) Control the feed water temperature at boiler inlet temperature. When decerator water quality is qualified, supply water to the boiler. boiler. (16) After axial heater water side, input steam turbine shaft gland system. a. Start one axial heater fan, open auxiliary steam to isolating valve warm pipe before and after shaft gland steam header main valve and gland steam regulating valve. b. After drain water is exhausted, exhausted, start shaft gland steam regulating regulating valve, maintain gland steam pressure 0.007-0.021MPa and LP gland steam temperature 120-150 ℃, and input LP shaft gland steam attemperating water temperature into automatic control. c. When starting or stopping the unit, the difference of HP-IP rotor shaft gland steam temperature and rotor surface metal temperature shall be less than 110_ ℃. Note: Do not supply steam to shaft gland for the rotor in static condition. Pay close attention to barring operation situations in process of shaft gland steam supply. The vacuum pump can be started only after the rotor supplies the shaft gland steam to provide condenser vacuum. (17) Input small turbine shaft gland system. (18) Keep the devices of air system under preparation before operation, start vacuum pump, close vacuum breaking valve, provide main engine and small turbine vacuum. (19) After condenser vacuum is provided, close main steam, cold regenerating, reheat, steam extraction pipelines and cylinder cylinder proper drain valve. valve. (20) Input HP heater feed water system. (21) Confirm the preparations before steam turbine startup have been finished completely, control the operated device and system in good condition, and standby device and system meet conditions ready for operation. 2.4.2.2

Jobs after boiler ignition

(1) After boiler ignition, notify the rolling parameters required for boiler according to cylinder temperature. (2) Input bypass system according to the need for LP bypass first and then HP bypass. Keep pressure before main steam valve over 0.1Mpa, and input HP-IP bypass attemperating water appropriately according to bypass temperature, pay attention to vacuum and exhaust temperature, contact chemical personnel to test condensate water quality. (3) Make main records as follows before rolling: cylinder absolute expansion, differential expansion, Steam Turbine Operation Manual Page 40 of 197


axial displacement, big shaft eccentricity and barring current, metal temperature at HP outer cylinder upper/lower wall control stage, bearing pad temperature and return oil temperature, HP main steam valve shell outer/inner wall metal temperature, t emperature, IP main steam valve outer/inner wall metal temperature. 2.4.3 2.4.3.1

Steam turbine rolling Check and preparation before rolling

(1) Interlock protection test is qualified and input it. (2) The unit auxiliary device and system run normally, with no condition for unit startup prohibition. (3) When the steam turbine is under cold startup, main steam valve inlet temperature has at least 56 ℃ superheat degree, but maximum temperature shall not exceed 430 ℃, and main steam valve inlet temperature and pressure shall be controlled within the scope shown in “main steam parameters at startup”. Fixed -speed warm-up time shall be determined according to control stage metal temperature. If this temperature is smaller than 120℃, the main engine will run warm-up for 150 min at speed of 2000r/min. (4) The barring device runs normally with rotor eccentricity less than 110% of original value (0.076mm), and in good condition after 4-hour continuous barring (strictly according to minimum continuous barring time before turbine rolling) . (5) Check shaft gland steam header pressure 24-28kPa, match shaft gland steam temperature with rotor surface metal temperature, and the temperature difference shall not exceed 110 ℃. Input LP shaft gland temperature into automatic control, with main engine lubricating oil pressure 0.096-0.15Mpa and lubricating oil temperature controlled at 38 ℃-42℃. (6) Generator seal oil system, s ystem, rotor cooling water system and hydrogen cooling system run normally. normally. (7) Turbine TSI indications are normal. 2.4.3.2

Conditions for turbine latch

(1) There is no condition for unit startup prohibition. (2) Confirm HP-LP differential expansion, axial displacement, HP-IP cylinder upper/lower temperature difference, eccentricity, steam chamber outer/inner wall temperature difference, etc. controlled within the limited scope, and consider trends of turbine change after start will not exceed the limit. 2.4.3.3

Confirm main steam parameters reach rolling conditions

Main steam pressure:5.0MPa

Reheater temperature:300℃

Main steam temperature:340 ℃ (1) HP-LP side condenser vacuum is greater than 80kPa. (2) Lubricating oil temperature is not lower than 35 ℃, and return oil of various bearings is normal. (3) Lubricating oil pressure 0.096-0.15MPa (4) Main engine barring device runs normally, normally, with normal voice in the machine. (5) Input LP cylinder water spray valve into “automatic”. Steam Turbine Operation Manual Page 41 of 197


(6) Close HP-LP bypass valve. (7) Make remote hand braking & lever resetting (8) DEH main control screen check Bar graph or description

Status

Description Descriptio n

HP main steam valve position indicator

0% valve position

TV1, 2

HP regulating valve position indicator

0% valve position

GV1, 2, 3, 4

Reheat regulating valve position indicator

0% valve position positio n

IV1, 2, 3, 4

Reheat main steam valve position indicator

CLOSED

Close (green light on)

Main circuit breaker status

2.4.3.4

Breaker

Open

Splitting Splitti ng

Steam turbine status

Turbine stop

Trip

Valve control mode

SINGLE

Single-valve

Generator power control loop

OFF

Cut off

Main steam pressure control loop

OFF

Cut off

Turbine control mode

MANUAL

Manual

Turbine latch

(1) Select “Latch Turbine” button on DEH main control screen, click “ETS reset”, and after ETS resets, click “ Latch Turbine” and select “YES” for turbine latch. After the latch is finished, check IP main steam valve is open, “ Enable Roll” indicator green light is on. (2) Select “automatic” mode in “control mode” on DEH main control screen. (3) Select “valve position upper limit” in “limiting value” on DEH main control screen, input “120” and click “GO”, check IP regulating valve, HP regulating valve are open. (4) Operate overspeed tripping mechanism with remote trip button or hand tripping lever installed in front box, and close all inlet valves. Test Test if the tripping s ystem is normal. (5) Repeat the above operations, and re-latch the turbine. 2.4.3.5

Operation and check before rolling

(1) Confirm HP-IP valve, HP exhaust check valve and extraction check valves are in close position, and turbine proper, HP-IP system system drain valve are in open position. (2) Select “single“single-valve” mode in “valve mode” on DEH main control screen. (3) Confirm main steam pressure, temperature meet unit requirements for cold startup. (4) Confirm turbine stage 1 metal temperature less than 120 ℃, main engine warm-up for 150 min at 2000r/min. (5) Confirm turbine under barring condition, and confirm it latched. Steam Turbine Operation Manual Page 42 of 197


(6) All auxiliary systems & devices of the unit run normally, normally, without abnormal alarming signals. (7) Confirm turbine proper, HP-IP system drain valve and LP cylinder water spray control switch is in automatic position. (8) Lubricating oil cooler, seal oil air/hydrogen side cooler, hydrogen cooler, generator rotor water cooler are in the state ready for operation. (9) Start LP heater accompanied with the machine, start LP heater steam supply motor-operated valve, and drain water stage by stage. 2.4.3.6

Turbine rolling at target 600r/min, turbine check

(1) Click “control setting value” button on DEH main control screen, set speed rising rate 150r/min, set target speed 600r/min, click “GO” button, and the unit starts to increase the speed. (2) When the rotating speed is greater than 3r/min, check the barring device quits on DCS screen, and barring motor stops. (3) When the rotating speed reaches 200r/min, check barring oil spray solenoid valve is closed automatically. (4) When the unit continues to accelerate the speed to 600r/min, and the rotating speed is controlled at 600r/min, carry out the check as follows: a. Hear the rotating part of turbo-generator unit with normal sound. b. Bearing pad vibration is less than 0.125mm, return oil is normal and bearing return oil temperature is less than 77℃. c. Metal temperature of various bearing is lower than 90.5 ℃. d. Oil cooler outlet oil temperature is controlled at 38 ℃-42℃. e. Check unit vibration, wrongly-connected axle, differential expansion, absolute expansion, cylinder upper/lower wall temperature difference within the allowable value. f. Confirm there is no abnormal alarm, and when the above parameters exceed the limit or approach the limiting value and has rise trend or unstable, immediately report to relevant leader, find out causes and prohibit the speed increase. increase. g. When the unit rotating speed reaches 2600r/min, switch LP cylinder water spray valve. h. When the unit reaches 600rpm at initial startup or after overhaul & minor repair, carry out check on braking friction. When turbine rotating speed reaches 600rpm, press the emergency shutdown button, cause the turbine trip, check and confirm TV, GV, RV, IV are closed, check turbine bearing, cylinder, shaft gland and other components, and hear turbo-generator unit without friction voice. i. Re-latch the turbine. 2.4.3.7

Continuous acceleration at target 2000r/min

(1) Click “control setting value” button on DEH main control screen, set speed rising rate at 150r/min, Steam Turbine Operation Manual Page 43 of 197


set target speed at 2000r/min, and click “GO” button to continue acceleration. (2) When the unit rotating speed reaches 600r/min, check that jacking oil pump stops. (3) Make warm-up at speed 2000r/min. During warm-up period, use auxiliary steam A small turbine warm pipe. (4) During the speed acceleration period, if the rotating speed is to be maintained, click “HOLD” button in “control setting value” on main control s creen, and to prevent steam turbine from resonance, do not stay within resonance speed range. Critical rotating speeds of steam turbine are: the first critical speed at 700-900r/min, the second critical speed at 1300-1700r/min and the third critical speed at 2100-2300r/min. (5) Warm-up time shall be determined according to stage 1 metal temperature: when it is equal to or smaller than 120 ℃, the warm-up shall last 150 min, and no warm-up time shall be reduced at any time. When IP cylinder inlet temperature reaches 260 ℃, start to calculate rotor heating time. (6) During warm-up period, main steam temperature shall not exceed 430 ℃, reheat steam temperature is maintained over 300 ℃, and the temperature rise rate is controlled at 0.92 ℃/min. (7) During warm-up period, carry out a comprehensive check on auxiliary device and system, and hear rotating parts with normal voice and no abnormal alarm. (8) After small turbine warm pipe is finished and rolling parameters are checked qualified, start to use auxiliary steam to roll the first steam pump according to actual situations to avoid water impaction. 2.4.3.8

When turbine turbine rotating speed rises rises to 2900r/min from from 2000r/min, 2000r/min, carry out valve switch.

(1) Confirm warm-up time is over and warm-up operation finishes. (2) Check cylinder expansion has extruded evenly. evenly. (3) HP-LP differential expansion is shortened gradually and stably. (4) Various Various control indexes will not exceed the limit and remain stable. (5) Click “control setting value” button on DEH main control screen, set speed rising rate at 150r/min, set target speed at 2900r/min, click “GO” button, and the turbine starts acceleration. (6) When the rotating speed continuously rises to 2900 r/min, and the speed is maintained at 2900 r/min automatically, automatically, the valve switch is prepared. Confirm steam chamber inner wall temperature at least equal to saturation temperature under main steam pressure. See the relationship between main steam valve inlet temperature and pressure at cold startup expressed in the appendix “turbine inlet steam status”. To realize steam chamber temperature at the required value, follow the parameter relationship. (7) “TV“TV-GV” switch operation a. Click “TV“TV-GV” button in “valve mode” on DEH main control screen, and click “switch”. b. Check HP valve GV is turned down gradually, gradually, HP main steam valve TV is turned up gradually until 100%, and the rotating speed is controlled by HP regulating valve. The rotating speed generally declines Steam Turbine Operation Manual Page 44 of 197


30r/min in switch process, not exceeding 70r/min. 2.4.3.9

Unit accelerates to 3000 r/min

(1) Click “control setting value” button on DEH main control screen, set speed rising rate at 100r/min, set target speed at 3000r/min, and click “GO” button. (2) The rotating speed accelerates to 3000r/min, and the speed is maintained at 3000r/min automatically. 2.4.3.10

Trip test

(1) Carry out local or remote manual braking. (2) Locally confirm HP-IP main steam valve and regulating valve rapidly closed, without jam. (3) DEH-DCS alarm, unit speed indication declines. (4) Re-latch the turbine. (5) Click “control setting value” button on DEH main control screen, set speed rising rate at 200-250r/min, 200-250r/min, set target speed at 2900r/min, and then click “GO”. (6) When the rotating speed reaches 2900r/min, carry out “TV“TV-GV” valve switch. (7) Continue to accelerate to 3000r/min fixed speed. (8) Fixed speed 3000r/min. a. Check main oil pump outlet oil pressure controlled within 2.0~2.5MPa, inlet oil pressure controlled within 0.12~0.14MPa. b. Stop AC lubricating oil pump, seal seal oil standby oil pump, switch for standby purpose. c. Adjust lubricating oil temperature at 38~42 ℃ and bearing return oil temperature less than 77 ℃. d. Carry out emergency governor oil charge test and reach qualified. (See test specifications for operations) 2.4.4 2.4.4.1

Unit combined to the grid and loading When the unit combined to the grid, the turbine shall have the following conditions:

(1) Confirm turbine is of stable rotating speed at 3000r/min, and DEH device in good condition. (2) All control indexes have no abnormal change for turbine no-load operation, and auxiliary devices run normally. (3) The test for turbine at 3000r/min has been finished. (4) Main steam temperature and steam pressure are stable. 2.4.4.2

Report to the shift supervisor, supervisor, notify electric personnel personnel for generator concurrency concurrency..

2.4.4.3

After combined combined to the grid, grid, confirm generator initial load at 30MW. 30MW.

2.4.4.4

After unit parallel parallel operation, operation, carry out check check on steam turbine.

According to steam turbine requirements, notify to increase boiler loads, and control the variation rate of boiler main parameters as follows: load variation rate at 3MW/min, steam pressure variation rate ≤0.10MPa/min, control stage temperature rising rate for loading <1.8℃/min. Generator initial load is 30MW, Steam Turbine Operation Manual Page 45 of 197


continues to run for 25min warm-up operation. (1) Check turbine vibration, differential expansion, absolute expansion, axial displacement and metal temperature of all bearings in normal condition, lubricating oil pressure, bearing return oil temperature, EH oil pressure in normal condition, and cylinder upper/lower wall temperature difference controlled within allowable range. (2) Confirm the following control devices are switched automatically: a. Electric feed water pump recirculation control; b. Pneumatic feed water water pump recirculation recirculation control; c. Deaerator pressure, water level control; d. Main engine lubricating oil temperature control; e. Hydrogen temperature control; f. After turbine initial-load warm-up operation is over, check turbine differential expansion within allowable range and cylinder absolute expansion in normal condition. 2.4.4.5

When the load continues to increase increase to 10% of rated load, load, and carry carry out the following following check:

(1) Comprehensively check, tighten drain valves. (2) Check the following drain valves shall be closed automatically: a. Main steam header drain; b. HP regulating regulating valve steam conduit drain; c. #1, 2 HP main steam valve upstream drain; d. HP exhaust check valve upstream, downstream drain; e. Reheat pipeline drain; f. #1, 2 IP main steam valve upstream drain; g. Stage 1 extraction check valve upstream drain; h. Stage 1 extraction motor-operated valve downstream drain; i. Stage 2 extraction check valve upstream drain; j. Stage 2 extraction extraction motor-operated motor-operated valve downstream downstream drain; k. HP cylinder proper drain. 2.4.4.6

When the load is increased increased to 15%MW of rated load, carry carry out the following operations:

(1) Turn deaerator auxiliary steam air source back to this turbine stage 4 steam extraction; (2) Switch shaft gland supply into cold regenerating supply. (3) The second steam pump uses four sections of steam extraction warm pipe. (4) Confirm LP cylinder water spray attemperating valve is closed automatically. automatically. When the load is increased to 20% of rated load, carry out the following operations: (1) Realize the first steam pump and electric pump under parallel operation; Steam Turbine Operation Manual Page 46 of 197


(2) Check all drain valves are closed automatically; (3) Auxiliary steam source is switched by startup steam source or steam source to cold regenerating steam. (4) When the overspeed test is carried out for the unit at initial startup (or after overhaul) , the load shall not be lower than 10% for 4-hour operation. (See test part for test operations) 2.4.4.7

After boiler load is is greater than 25%MCR and drum level level is stable, switch the drum drum level

automatically according to pneumatic feed water pump operations. 2.4.4.8

When the second second steam pump warm pipe is over, over, the rolling parameters are qualified and then carry carry

out the rolling. 2.4.4.9

When the load load reaches 300MW, 300MW, start four extraction to supply supply steam to this this turbine auxiliary steam

header according to four-extraction pressure. Comprehensively check and close drain, discharge valve, keep the second steam pump paralleled and stop electric pump. 2.4.4.10

According to actual situations situations of the unit, after 1-day 1-day stable operation, switch “single-valve “single -valve

control” into “sequence valve” for the turbine. 2.4.4.11

When the load reaches reaches 360MW, 360MW, check auxiliary auxiliary steam source parameters and and four-stage extraction

parameters for the first first steam pump are matched, and two-way steam source source temperature is of little deviation, the first steam pump steam source is fully switched into four stage to prevent from water impaction. 2.4.4.12

When the load reaches 450MW, 450MW, auxiliary steam source is switched by cold regenerating regenerating steam into

four-stage extraction supply. 2.4.4.13

Gradually carry the loads loads fully, fully, carry out comprehensive check check and adjustment adjustment to keep unit device,

system under optimal operation state. Carry out the statistics on unit defects. 2.4.4.14 2.4.5 2.4.5.1

Check and switch main engine oil purification device.

Precautions in startup process Throughout the startup startup process, pay pay attention to the water level level of condenser, condenser, deaerator deaerator,, heater, heater, close

water tank, rotor cooling water tank in normal condition, the oil tank oil level under normal condition, and oil temperature in conformity with the requirements. 2.4.5.2

After the rolling, promptly adjust main engine engine lubricating oil temperature at 40±2℃; guarantee

stable parameters when the unit rolls and increases the speed. 2.4.5.3

When the rotating speed is less than 600r/min, monitor turbine eccentricity; when the rotating rotating speed

is greater than 600r/min, monitor unit vibration. When the unit accelerates to resonance area, strictly monitor vibration situations. At any rotating speed, when a bearing vibration reaches 0.254mm, immediately open the brake and stop the turbine, treated as emergency emergency shutdown. For oversized vibration at declined rotating speed, speed, when the rotating speed declines to under 600r/min, monitor rotor eccentricity: when the eccentricity is greater than 0.076mm, carry out continuous barring, re-start until the eccentricity is less than 0.076mm. Steam Turbine Operation Manual Page 47 of 197


2.4.5.4

During turbine speed speed acceleration, acceleration, locally hear hear unit frication frication voice carefully carefully,, and if discovering discovering any

abnormality, stop the turbine and find out causes. During the speed acceleration, under any of the circumstances, DEH shall maintain the rotating speed, and if the speed is controlled within critical speed range, when the speed is increased over critical speed, maintain: (1) Bearing vibration more than 0.125mm; (2) Large HP-IP differential expansion; (3) Bearing return oil temperature up to 75 ℃; (4) Thrust bearing metal temperature up to 85 ℃; (5) LP cylinder exhaust temperature up to 80℃. 2.4.5.5

After main main engine AC lubricating oil pump stops, stops, promptly switch for standby. standby.

2.4.5.6

Before generator generator parallel operation, operation, note that LP LP cylinder cylinder exhaust temperature temperature shall not exceed exceed

80℃. 2.4.5.7

In process of the unit load increase, promptly promptly charge charge hydrogen to generator. generator.

2.4.5.8

When the unit load is greater than 30%, switch switch it into into coordination control as soon as possible.

2.5

Startup at other states

2.5.1

Hot startup

This startup mode is only used for boiler steam pressure 7MPa, and the turbine is under hot startup. The preparations before startup shall be carried carried out according to relevant relevant chapter of cold startup. 2.5.1.1

Rolling conditions

(1) Check preparation works before the rolling according to cold startup, and confirm the system run normally. (2) Steam temperature and steam pressure meet rolling parameters and remain stable. (3) Stage 1 steam temperature and stage 1 metal temperature has good match, and stage 1 steam temperature temperature is determined by rolling parameters according to Annex 3 “Hot startup recommended value-rolling value-rolling and minimum loading” curve. Under any circumstance, stage 1 steam temperature shall not be higher than stage 1 metal temperature by 110℃ or lower by 56 ℃. (4) Recommended rolling parameters parameters Man steam pressure

7MPa

Main steam temperature

450℃

Reheat steam temperature

435℃

(5) Determine the speed rising rate according to rolling parameters parameters with Annex D curve. 2.5.1.2

Speed rise

(1) Input the determined speed rising rate and target speed 600r/min into the controller according to operation methods of DEH control panel and DCS at cold startup. Steam Turbine Operation Manual Page 48 of 197


(2) When the rotating speed is lower than 600r/min, the eccentricity indicator shall be stable and less than 0.075mm, when rising to 600r/min, check all monitoring instruments of steam turbine and confirm them under normal condition, and when the rotating speed is greater than 600r/min, observe the vibration, etc. (3) After the check in normal condition, continue to raise the speed at target speed 2000r/min, and after rising speed to 2000r/min, speed rising rate is 300r/min, and target speed is 2900r/min. (4) When the rotating speed s peed reaches 2900r/min, remain it and prepare for TVTV- GV valve “switch”. (5) Confirm according to valve switch requirements as per cold startup, and carry out valve switch after relevant requirements are met. (6) After “valve switch” is finished, set speed rising rate at 100r/min, and increase the unit speed to 3000r/min. 2.5.1.3

Grid connection & loading

(1) After turbine fixed speed, carry out trip test according to the needs to make unit trip at control chamber or local operating trip button or operating lever, and check main, reheat steam valve without any abnormality. (2) Reset the turbine, and increase the unit speed to 3000r/min. (3) Carry out emergency governor oil charge test according to the needs. (4) After finishing the test, contact electric personnel to make generator combined to the grid. (5) After the generator combined combined to the grid, 5% load is charged according to cold startup mode. (6) According to stage 1 steam temperature and stage 1 metal temperature, check Annex G “Hot startup recommended valve-rolling valve-rolling and minimum loading”, determine warm-up warm -up time under 5% load (if the parameter are changed, namely HP cylinder inlet parameters are changed, re-determine stage 1 steam temperature and determine warm-up time) . (7) After the unit warm-up operation under 5% load, increase the load by 1.5%. (8) After the unit load increased to 30%MCR, increase the load and pressure by 0.30MPa/min and 2% respectively to the rated. 2.5.1.4

Precautions for hot startup

(1) Steam turbine shall first supply shaft gland and then pump vacuum. (2) After boiler ignition, switch bypass system as soon as possible to improve steam parameters and meet turbine rolling requirement. (3) After the unit rolls, increase the speed, combine to the grid and carry the loads as soon as possible to control metal components rising rate, upper/lower cylinder temperature difference and cylinder differential expansion, vibration within normal range. (4) Carry out boil temperature/pressure rise operation according to warm, hot, extreme hot state curve. (5) When auxiliary steam is used to supply steam to shaft gland in hot startup, auxiliary steam header Steam Turbine Operation Manual Page 49 of 197


warm pipe shall be full, and the drain water shall be exhausted. (6) For hot startup, turbine main, reheat steam pipeline, conduit drain, proper drain valve must be open, and drain pipeline is of normal temperature. (7) For hot startup, transmit to the corresponding working condition point as soon as possible based on the principle of cylinder metal temperature not cooling at turbine load rising rate according to startup curve. (8) Select qualified rolling parameters according to cylinder temperature to avoid water impaction incurred to the steam turbine due to water in the steam. 2.6

Operation mode instructions for DEH There are four basic control modes: Automatic control; CCS remote control; Manual control; Synchronization control

2.6.1

Automatic control

2.6.1.1

During rotating speed rising, it can confirm or modify the rising rate rate and target speed.

2.6.1.2

The switch from from the control control of the main main valve to the pressure control door can be carried out.

2.6.1.3

When the unit is up to the rated speed, automatic synchronization can can be put into effect. effect.

2.6.1.4

When the unit is synchronized, it can timely modify or confirm the unit’s target load and loading

rate. 2.6.1.5

The remote control operation can be put into effect. effect.

2.6.1.6

It has valve management functions – functions – namely, namely, single valve and sequence valve control.

2.6.2 2.6.2.1

CCS remote control Input conditions

(1) The DEH device in automatic mode; (2) The switch of the generator outlet closed; (3) The main steam pressure circuit without being inputted by DEH; (4) The power control circuit without being input by DEH; (5) Contact closure allowed in remote control. 2.6.2.2

Input methods

After pressing the "remote control" button, it indicates that the control device has already been in coordinated control operation mode, and sends a pair of contacts of "remote control choices" to CCS, which shows that DEH has accepted the add and subtract pulse of the load parameter from CCS. 2.6.2.3

Excision methods

If any of the above five conditions is not available, or the “remote control” button is repressed, th en it Steam Turbine Operation Manual Page 50 of 197


will withdraw from the remote control mode, entering into the “automatic” mode of DEH. 2.6.3

Manual control

2.6.3.1

The switch switch conditions of DEH DEH from automatic mode mode to manual control control mode

The unit is not connected, the velocity measurement system doesn’t work, and the system automatically switches to the manual control mode. 2.6.3.2

Under the manual manual control mode, the operator operator directly controls the high pressure main main valve and the

opening of the pressure regulating door, with the slow rate of 10% valve /min and the rapid rate of 30% valve /min, while pressing the corresponding button without stop means to act according to the set speed. 2.6.3.3

Precautions

(1) No use of the manual control mode is available during the rising speed period of the unit. (2) If it automatically switches to the manual control mode during the rising speed period, the unit speed rising should be stopped and to be processed. In the automatic grade, it should hang the gate again after hitting the gate, and then can be put into automatic mode. 2.6.4

Synchronous control

2.6.4.1

Synchronous input conditions

(1) DEH device in automatic mode; (2) High pressure regulating valve control mode; (3) The outlet switch of the generator is closed; (4) Rotating speed of the turbine is within the synchronization range (2950 ~ 3050r/min). 2.6.4.2

Synchronous input methods

Click “control mode” button in the main control screen of DEH, select “synchronism” and confirm, with the dialog box showing “IN”. 2.6.4.3

Synchronous resection conditions

(1) The generator outlet switch closed; (2) The system switches to manual operation or the actual speed exceeds the synchronous speed range. 2.7

Unit shutdown

2.7.1 2.7.1.1

Preparations before shutdown Start up respectively and try to run run AC and DC pumps, Jacking oil pump, and check check whether its its

rotation and turning gear motor air test is normal. 2.7.1.2

Make good preparations preparations for the switch among among auxiliary steam, shaft seal seal and steam source of the the

deaerator. 2.7.1.3

Inform the staff of respective positions to conduct a comprehensive inspection of the equipment

system, count flaws, and be ready for outage. 2.7.2

Unit slide stop Steam Turbine Operation Manual Page 51 of 197


2.7.2.1

After receiving receiving the value value of long shutdown command, command, the heat load of the boiler starts to fall, and

the coal pulverizing system gradually stops from top to bottom. In accordance with the requirements of the turbine shutdown curve, it starts to cool and step down. When the unit halts, the first grade cylinder temperature of the turbine high pressure shouldn’t be lower than 400 ℃, until the chief engineer approves. 2.7.2.2

The boiler’s load is reduced by load change r ate ate of no less than 3MPa/min and 0.15MW/min of the

main steam pressure. 2.7.2.3

When the load is 480MW 480MW,, conduct the vacuum tightness test according to the situation.

2.7.2.4

When the load is 450MW, 450MW, check and guarantee guarantee that the seal seal pressure of the main engine is normal normal

and pay attention to the switch of the shaft seal steam source. Switch "sequence valve" of the main engine to "single valves" control. 2.7.2.5

When the load load is 300MW, 300MW, the main stream stream pressure is is 10MPa load, the main steam steam temperature is

540 ℃, and the reheat steam temperature is 520 ℃. 2.7.2.6

The load gradually gradually drops at less than 3MW/min load change rate, and and the main stream stream pressure

lowers at the rate of less than 0.10MPa/min. 2.7.2.7

When the load load is 240MW, 240MW, stop pumping from from four sides and supply steam to the auxiliary steam

header, and open the cold period to the valve of the auxiliary header. Start the electric pump after pump merged, and stop the operation of a steam pump. 2.7.2.8

When the load is 180MW, 180MW, run it stably for 60 minutes.

2.7.2.9

When the load is 150MW, 150MW, stop the operation operation of the second second steam pump according according to the water water

supply rate, and change the water supply control to the single impulse. The deaerator shall be inverted to standby steam source, and be dropped out of the high pressure heater operation. Pay attention to the changes of water supply temperature, and adjust the steam temperature timely. timely. The steam s team source of the shaft seal shall be cut to the auxiliary steam supply. supply. 2.7.2.10

When the coal feeder feeder speed of one of the remaining two running coal grinding machines machines is lower

than 50%, put it into the adjacent layer of the grease gun, and reduce the coal feeder speed with the load reduction. 2.7.2.11

When the load is 120MW, 120MW, undertake the inspections inspections listed as follows: follows:

(1) Check and ensure that the following valves of the main engine shall be open automatically: a. Stage 3 steam extraction shall be drained drained before the check valve. b. Stage 3 steam extraction shall be drained drained after the auto valve. valve. c. Stage 4 steam extraction shall be drained drained before the check valve 1. d. Stage 4 steam extraction extraction shall be drained after the check valve 2. e. Stage 4 steam extraction shall be drained drained before the auto valve. valve. f. Stage 4 steam extraction extraction providing steam for the mini-engine shall be drained before the auto valve. valve. Steam Turbine Operation Manual Page 52 of 197


g. Stage 4 steam extraction extraction for auxiliary steam supply shall be drained before the auto valve. valve. h. Stage 5 steam extraction extraction shall be drained before the check valve. valve. i. Stage 5 steam extraction shall be drained drained after the auto valve. valve. j. Stage 6 steam extraction shall be drained drained before the check check valve. k. Stage 6 steam extraction shall be drained drained after the auto valve. valve. (2) The steam source of auxiliary steam shall be switched from the cold reheat steam to the startup boiler steam or to the neighbor, and the main water feed line shall be switched to the bypass for operation according to the water supply flow. 2.7.2.12

when the load is 100MW, 100MW, proceed proceed the operation as as follows: follows:

The steam source of the four steam sections of the deaerator shall be back to the auxiliary steam; 2.7.2.13

When the load is 60MW, 60MW, check if the turbine LP LP cylinder inputs water water automatically. automatically. Check and

guarantee that the following hydrophobic valves shall be closed automatically: a. The main steam pipe drainage; b. The guide tube drainage of high pressure pressure regulating valves; valves; c. Drainage before the main steam valve of high pressure #1, 2; d. Drainage before/after the check valve of high ranked hydrophobic; e. Reheat pipe drainage; f. Drainage before the main steam valve of mid-pressure #1, 2; g. Stage 1 stream extraction shall be drained before the check valve; h. Stage 1 stream extraction shall be drained after the auto valve; i. Stage 2 steam extraction shall be drained before the check valve; j. Stage 2 steam extraction shall be drained drained after the auto valve; k. High pressure cylinder shall take self-drainage. 2.7.2.14

When the water flow is less than or equal to 10%, open the economizer recycle valve.

2.7.2.15

When the load load is 60MW, 60MW, carry on low and random random slip stop. Reduce the active power power to zero, zero, split

both the generator and the system, and check if the generator stator voltages and the three-phase currents reach zero. After the AC lubrication oil pump of the main engine starts normally, the turbine shall open the brake manually, manually, and check and make sure the doors of the main steam valve and the adjusting valve in high and medium pressure shall be closed with rotating speed starting to decline. 2.7.2.16 2.7.3 2.7.3.1

Outage of the hydrogen cooler. cooler.

The operation operation of the turbine equipment equipment after splitting the unit The splitting of the generator shall reduce the load to the minimum, minimum, and adopt the method of the

turbine in starting the reverse power first by opening brakes to protect the switches of the disconnected development changing groups to split and shutdown. Steam Turbine Operation Manual Page 53 of 197


2.7.3.2

Press the "turbine "turbine trip" button on the control panel or manually manually open the brake on the spot to check check

the high/medium pressure of the main steam door, high/medium pressure of the adjustment valve, the check valves of steam extraction in each grade, and the tightly closed check valve of high output. 2.7.3.3

After the turbine turbine trips, confirm confirm and make make sure that the doors of the the turbine and adjustment valve

under high/ medium pressure is closed, and the waterproof protection indicator are normal. 2.7.3.4

When rotating speed slows down, pay attention to the conditions of critical critical vibration, vibration, and listen to

the voice of the cylinder to check its normality; 2.7.3.5

Take care that rotating rotating speed begins to decline decline after the turbine turbine hits the brakes, and and opening the

vacuum breaking valve is strictly prohibited at the rate of more than 2000r/min except in special circumstances. 2.7.3.6

After the turbine hits the brakes, the AC lubricating oil pump and the spare seal oil pump shall be

automatically started, or manually started, if the oil pressure falls, take care that the DC lube oil pump shall be linked, or manually started. 2.7.3.7

In coasting coasting operation operation process, process,

take care care that the monitoring monitoring lubricating lubricating oil pressure and the

temperature changes shall be normal. Seal oil / hydrogen pressure shall be normally regulated, as well as the balance valve of air / hydrogen side seal seal oil pressure. 2.7.3.8

When rotating speed falls to 600r/min, the first pump shaft seal seal starts automatically automatically,, as to check check the

normality of each top axis oil pressure. 2.7.3.9

When the turbine speed reaches 2600r/min, 2600r/min, check the automatic automatic closing of LP cylinder water valve

of the turbine. 2.7.3.10

When rotating rotating speed falls to less than 400rpm, the vacuum break is allowed.

2.7.3.11

When rotating speed falls to zero, carry carry on the barring gear meshing on the spot, and manually manually put

it into the jigger. Note the records of the coasting operation time of the rotor. After the host barring is inputted, keep a regular time in recording the rotor eccentricity, high pressure cylinder expansion, differential expansion, the first grade temperature of the high/medium pressure cylinder, axial displacement, etc. 2.7.3.12

After the boiler flameout happens, confirm that the bypass system is insulated, close the drainage drainage

of high/medium pressure before the main steam valve, and after the check valve of high hydrophobic, etc. Check that no steam and pressure drainage entering into the condenser (especially pay attention to the auxiliary steam and drainage’s entering into the cylinder and condenser), otherwise, carry on the inspection of closing all the drainage of the condenser, stop the operation of the vacuum pump, and open the vacuum breaking valve of the condenser under high, high, and low pressure. 2.7.3.13

When the condenser in vacuum vacuum reaches reaches zero, stop the shaft seal steam supply, close all the steam

source of the shaft seal, and stop the axial fan. Notice that the temperature of the exhaust hood cannot rise to more than 50 ℃. Steam Turbine Operation Manual Page 54 of 197


2.7.3.14

Stop the operation of the EH pump pump according to the need if the conditions are allowed, and keep keep

EH oil circulation system running according to the need. 2.7.3.15

Cut the condensate water treatment device chemically. chemically.

2.7.3.16

Stop the operation of the cooling pump pump according to the requirements requirements of the closed cooling water

temperature. On condition that the the exhaust temperature temperature of the the LP cylinder is lower than 50℃ without the

2.7.3.17

entrance of stream water in high temperature to the condenser, and the closed cooling water temperature is very low, low, the other circulating pump shall be shut down. After the exhaust temperature temperature of the LP cylinder falls to 50 ℃ without the condensate water users,

2.7.3.18

the condensate pump can be stopped running. 2.7.3.19

After the requirements requirements of barring outage are are satisfied, stop stop turning the barring barring device. Stop the

pump shaft seal when the rotor is static. 2.7.3.20

The gas replacement replacement of the generator is generally generally required required to be carried carried on after the continuous

barring of the main engine stops, and the changes of the oil level in each seal oil case shall be closely monitored in the replacement process to prevent the occurrence of the oil entering into the generator. 2.7.3.21

Not until the gas replacement replacement is finished and the turbine barring is shutdown can can the seal oil

system stop the operation. 2.7.3.22

Stop the operation of the lubricating lubricating oil system. system.

2.7.3.23

Whether to stop the operation of the closed cooling cooling water pump depends on the conditions of the

closed cooling water users. 2.7.3.24

Stop the condensate water delivery pump.

2.7.3.25

To do well with the maintenance and the inspection inspection and segregation segregation work of each equipment after

shutdown. 2.7.4 2.7.4.1

Precautions for unit shutdown The turbine shall shall coordinate well with the boiler during the process of slide stops, and the declined

temperature and pressure shall not rise again. When the coal grinding machine is stopped running, pay close attention to the changes of temperature, furnace pressure and the steam drum water level of the main turbine. Note the falling speed of the steam temperature and the wall temperature of the steam cylinder, cylinder, while the falling speed of the steam temperature shall be in strict conformity with the requirements of the slide stop curve. If the steam temperature falls sharply to 50 ℃ within 10min, open the brake for shutdown. 2.7.4.2

Pay attention to the the normality of the water level level in the load falling process, and withdraw from the

operation of the high and low pressure heaters timely. Provide the pump with minimum flow valve the pump and open it previously according to the load conditions. 2.7.4.3

Pay attention to the enhancement enhancement of monitoring monitoring and measuring measuring the vibration vibration of each each bearing during during Steam Turbine Operation Manual Page 55 of 197


the process of slide stops, if abnormal vibration occurs, hit the gate immediately. immediately. 2.7.4.4

The unit shall be better better to avoid running for a long time under the load of 60MW, 60MW, reduce the active active

power of the generator to zero immediately before splitting, release the turbine manually, manually, check and make sure that the doors are closed, including the main steam valve and the adjustment valve of high/medium temperature, the check valve of steam extraction in each grade and the exhaust check valve. 2.7.4.5

Notice that rotating rotating speed starts starts to decline after the turbine hits the gate, and the door of the vacuum

breaking valve is forbidden forbidden to open above 400r/min 400r/min under no special circumstances. circumstances. 2.7.4.6

Check and start start the jacking oil pump automatically automatically when rotating speed of the turbine falls to

600r/min. Check the oil levels of the seal oil floating ball valve valve and the the seal oil system to

prevent oil

leakage into the generator. 2.7.4.7

Before the condenser condenser in vacuum vacuum reaches reaches zero, all the drainage of the condensate turbine shall be

closed. When vacuum reaches zero, stop the operation of the sealing system and close the manual gate of 6.9 meters. Close the tube expansion and thermal reduction water. 2.7.4.8

Pay attention to the records records of the idling idling time of the rotor. Manually input the jigger when the rotor

is static. After the host barring is inputted, keep a regular time in recording the rotor eccentricity, high pressure cylinder expansion, differential differential expansion, the first grade temperature of the high/medium pressure cylinder, axial displacement, etc. During the operation period of the barring, the lubricating oil temperature shall be 38 ~ 42 ℃, maintaining maintaining the normal operation of generator’s seal oil system. Listen to the sound of the HP/LP bearings carefully and regularly. Closely monitor metal temperature trends of the steam cylinder, to prevent cold air or water entering into the turbine. 2.7.4.9

The barring shall shall run continuously until the first-grade metal metal inner wall temperature of HP cylinder cylinder

is less than 150 ℃. Maintenance the system related to the turbine itself is banned during the barring period after shutdown, to prevent cold air entering into the steam cylinder, special conditions must be reported to the chief engineer for approval, and the following provisions shall be executed: 2.7.4.10

When the boiler needn’t draw water, stop heating the deaerator, deaerator, shut down the electric pump, retain

a circulation pump, and shut down the condensate water pump according to the conditions. 2.7.4.11

When the exhaust temperature temperature of LP cylinder falls to 50 ℃, shut down the last circulating water

pump after the outage of the open water system. system. 2.7.4.12

When the load reaches reaches no more more than 300MW, 300MW, record the temperature temperature of the turbine cylinder cylinder every

one hour, until the highest point of the steam cylinder temperature falls to 100 ℃. 2.8

Equipment maintenance of the turbine after shutdown

2.8.1

The maintenance rules of shutdown within a week week

2.8.1.1

Drain away away the water stored in both the deaerator and and the condenser condenser hot well.

2.8.1.2

Drain away away the remaining remaining water of the HP/LP steam side. side.



2.8.1.3

Keep away away from all the steam water valves that may enter into the turbine. turbine.

2.8.1.4

All of the extraction steam steam pipelines, the main steam steam and reheat reheat steam pipelines and the drain valves

of the turbine shall be fully opened. 2.8.2

The maintenance maintenance rules of the turbine outage for more than than a week:

2.8.2.1

Take Take the above 1~4 measures into action.

2.8.2.2

Keep maintenance maintenance to the HP/LP HP/LP heater, heater, the steam and water water sides, and the the deaerator by nitrogen

filling. 2.8.2.3

The equipment without running for a long term shall drain away away the remaining remaining water in the

equipment and system.



3.

Unit operation and maintenance maintenance

3.1

Operation and maintenance contents

3.1.1

All the operators in various posts shall copy the meters regularly regularly and correctly according to the

requirements of the operation daily records, and record the abnormal operation of units and the operation situation completely in the duty records. 3.1.2

Take the tour of inspection inspection on the equipment equipment regularly and in fixed line when when the unit is running or in

reserve. Focus on the inspections of the oil system to prevent oil leakage from fire accident. Report the discovered problems immediately to the relevant departments and keep in touch with them to eliminate, and input the equipment defects into the computer, making positive expectations for the equipment defects. the equipment defect actively do a good job of contingency. When taking the isolation measures, be sure not to affect the thermal sampling, when necessary, protection of operation errors may be eradicated by the thermal confirmation. 3.1.3

Check the unit operation conditions and the monitoring monitoring meter indicators indicators regularly. regularly. When the meter meter

indicator is different from the normal value, identify the reasons. While the equipment fails to work, contact and report it timely, and take necessary measures. The current, sound, temperature, vibration and the bearing level of each working equipment shall be normal. 3.1.4

The standby equipment shall be in good standby conditions, conditions, as interlocking interlocking is in input position, the the

bearing oil is in good quality, quality, and the oil level is normal. normal. 3.1.5

Special attention attention shall be paid to the unit operation situation in the following circumstances:

3.1.5.1

The load is rapidly changes;

3.1.5.2

The steam parameters or vacuum rapidly change;

3.1.5.3

Abnormal sound emerges inside the turbine;

3.1.5.4

System failure happens;

3.1.5.5

Automatic input cannot work.

3.1.6

Adjust the operation operation mode timely timely and reasonably reasonably,, analysis and and tackle the equipment failure failure to ensure ensure

the safe and economic operation as well. 3.1.7

Monitor and adjust the steam pressure of the the turbine gland according to the changes of the load to

ensure that the air doesn’t leak inside, and the steam does not leak outside. 3.1.8

The operators operators on duty shall take regular regular tests and switching work of the equipment according to the

provisions, and shall have the right to s upervise the relevant personnel to do preventive maintenance work of the equipment, such as regular refueling for the equipment, medium testing, regular locking screws, flushing gauge tubes, etc. 3.1.9

Closely monitor the the operation parameters parameters and and running states during the equipment equipment operation, and

equipment operation exceeds the power output is strictly prohibited except for accident treatment. Steam Turbine Operation Manual Page 58 of 197


3.1.10

Inspection and monitoring shall be strengthened as to the newly input equipment equipment or the equipment

running in illness . 3.1.11

Various control equipment shall be possibly put into automatic ways during the operation of unit to

monitor the reliability of the automatic device, when the automatic device hits failure, switch the automatic operation to the manual one, and maintain various operation parameters within permissible ranges. 3.1.12

When abnormal abnormal conditions happen happen or the unit operation conditions conditions change a lot, the personnel personnel on

duty shall remove the related automatic adjustment and carry on manual adjustment depending on the cases, to ensure the stability of the unit operation parameters. Take care when relieving the automatic operation to the manual one. When adjusting the coal mill load, the fan power output, as well as the main, reheat steam temperature and heating reduction water, be care not to overshoot, and shall communicate mutually and coordinate well with each other, to avoid the fluctuation of operation parameters in a large range, so as not to cause abnormal operation in the unit or the expansion of the accident. 3.2

Motor normal operation operatio n and maintenance

3.2.1

After motor maintenance, the staff shall handle the work ticket end procedures, procedures, and give give an account of

the operation conditions and the value of insulation resistance. 3.2.2 3.2.2.1

Checking projects before starting the motor Check and ensure the work ticket has already been been ended, the local staff have have been evacuated, evacuated, and

no litters hindering the operation are placed around the motor and keep it clean; 3.2.2.2

Check the power-off power-off protection and the correct input of interlocking device; device;

3.2.2.3

Check and ensure ensure that the equipment of the motor possess startup startup conditions, and no reversal reversal

phenomenon exists; 3.2.2.4

The bearing oil level is normal, oil color is transparent transparent without impurities, impurities, and the oil cover is

perfect without any defect. If forcibly adopting the oil circulation lubrication, lubrication, put into the oil system first; first; 3.2.2.5

The DC motor shall check the commutation commutation brush contacts contacts well with smooth surface and and proper

brush spring pressure; 3.2.2.6

The foot screws screws of the motor, motor, ground ground wires and coupling, protective protective cover, cover, and junction box are are

firmly fixed; 3.2.2.7

The manual barring works works with no jam phenomenon, and no friction friction sound exists exists in both the stator

and the rotor; 3.2.2.8

The motor and the electrical instruments instruments of associated associated equipment, equipment, and the thermal instruments instruments shall

be complete and correctly correctly input. 3.2.3 3.2.3.1

Precautions for motor startup The approved approved startup times times of the squirrel squirrel cage motors in the cold and hot states, shall shall be carried carried on

according to the provisions of the manufacturing plants, if no provisions exist in the manufacturing plants, Steam Turbine Operation Manual Page 59 of 197


confirm it according to the property of the associated equipment and the startup conditions. Under normal circumstances, start two times is allowed in the cold state, with each interval of no less than 5 minutes; start one time in the hot state; start one more time only on condition that there are accidents to be handled and the startup time is no more than 2 ~ 3 seconds. When starting the motors produced by Shanghai Motor Factory, restarting can only happen in the cold state after two continuous startups with the interval of 4 hours. After a continuous starting in the hot state, restarting can only happen after the interval of 4 hours. 3.2.3.2

When taking taking the action balance balance test, test, the startup interval interval is as follows:

(1) As to the motor below 200 KW, KW, the interval shall be no less than half an hour; (2) As to the motor of 200 ~ 500 KW, KW, the interval shall be no less than one hour; (3) As to the motor above 500 KW, KW, the interval shall be no less than 2 hours. 3.2.3.3

Regulations on cold cold and hot states of the the motor: motor:

(1) The cold state: the temperature of motor itself is or below 60 ℃; (2) The hot state: the temperature of motor itself is above 60 ℃; 3.2.3.4

Monitor the changes of the currents closely when starting the motor, if the currents don’t return for a

long time after the start of the motor, or the currents don’t move and the motor doesn’t work after closing the switch, stop the operation of it and restart it after finding out the causes. 3.2.4 3.2.4.1

Inspections during motor operation The ammeter ammeter indication shall be stable, without without exceeding the rated value, value, otherwise it shall be

reported to the shift supervisor, and take measures according to their instructions; the device shall be shut down immediately when the currents are suddenly plateful; 3.2.4.2

The motor sound shall be normal, the vibration and shifting shall not exceed the specified specified value, and

the indicating lamp shall be normal; 3.2.4.3

The temperature temperature of each each motor part part does not exceed exceed the specified value, value, with no phenomena phenomena such as,

smoke, burning smell, overheating and so on; 3.2.4.4

The ground wires wires of the motor shell and the starting starting device device shell are good, and the the foot screws screws shall

not loose. The bearing oil level is normal without oil spout and leakage. The oiliness is transparent with no debris, the oil ring rotates flexibly, and both the end cover and the head cover are well sealed; 3.2.4.5

The motor ventilates ventilates well without being blocked, the positions of the cooling water valve valve and air

duct baffle are correct, and the motor surroundings are clean without litters around. 3.2.5 3.2.5.1

Motor normal maintenance The motor, motor, the bearing of which which is lubricated by the oil ring in the operation, shall fill fill oil

appropriately according to the oil level indication, and the rolling bearing shall also fill oil generally. The oiler (the grease gun) shall be used to add lubricant oil of the same quality when necessary. necessary. 3.2.5.2

The replacement replacement of the bearing bearing lubrication oil generally generally shall be no less than once a year, year, and clean



the bearings thoroughly during the replacement. 3.3

Unit operation mode

3.3.1 3.3.1.1

Unit control The unit load within within the range of 30% ~ 100% can be operated operated under the coordination control mode.

As long as the system works without faults, it’s better to input the coordination control. In the process of unit startup, input the coordination control by level and give priority to CBF when three grinds are automatically inputed. During the normal operation, choose the unit control mode according to the main and auxiliary equipment health of B level, and the abnormal side is considered as the tracked target. Relieve the coordinated control immediately and switch to manual adjustment, in order to avoid accident expansion if any of the following circumstances happens: (1) RB condition appears, but the RB function is not automatically achieved; (2) The regulation characteristics become worse, the main parameters of the unit deviate from the normal range with no reply for a long time; (3) When the unit is conducting high load operation, the main steam pressure continues to rise and the main steam temperature declines sharply. sharply. 3.3.2 3.3.2.1

Unit control modes Unit follow mode

(1) Turbine follow mode (TFB), the main control of boiler is in charge of power and the main control of turbine is in charge of pressure. (2) Boiler follow mode (BFT), the main control of boiler is in charge of pressure, and the main control of turbine is in charge of power and pressure. This mode is the common way in use. Toggle the modes through the screen switch button. 3.3.2.2

Basic mode (BASE)

When the main control system of both the boiler and the turbine are in manual mode, the control mode is just the basic mode. 3.3.2.3

Boiler follow mode (BFT)

(1) Under the boiler follow mode, input the main control automation of the boiler, control the pressure, and the main control of the turbine manually control the power. power. (2) When the power measurement deviation is large, automatically convert to the turbine follow mode. 3.3.2.4

Turbine follow mode (TFB)

Under the turbine follow mode, input the main control automation of the turbine, and control the pressure. The main main control of the boiler controls the power manually manually.. 3.3.2.5

Boiler follow coordination mode (CCS)

(1) Under the operation of the boiler follow coordination mode, input the main control automation of the Steam Turbine Operation Manual Page 61 of 197


turbine, the unit comes to the boiler follow coordination mode (CBF). This mode is the commonly used coordination mode. (2) When the boiler side RB happens, automatically convert to the turbine follow mode. (3) When the main control of boiler is in manual mode, automatically convert to the turbine follow mode. 3.3.2.6

Turbine follow coordination mode (CCS)

(1) Under the condition of the operation of the turbine follow mode, input the main control automation, and the unit comes to the turbine follow coordination control mode (CTF). (2) When the turbine side RB happens, automatically convert to the turbine follow mode. (3) When the main control of the turbine is in manual mode, automatically convert to the turbine follow mode. 3.3.2.7

Automatic scheduling system in remote distance (ADS)

(1) The unit in both CBF and CTF modes can enter into ADS mode. Under the control mode, adjustment halfway is allowed to control the unit load via ADS. (2) ADS pattern may possibly appear in CBF and CTF modes, the operation mode can be switched among these modes. ADS modes will be automatically switched to the original control mode in the following cases: locking load increasing, locking load decreasing, remote scheduling of no avail, load shedding. The maximum and minimum load limit of the unit is still valid in ADS mode. 3.3.2.8

Load rejection (RB)

3.3.2.9

Locking load change (BLOCK)

3.3.3 3.3.3.1

Operation mode of unit protection interlocking All the protection protection and interlocking interlocking of the running and standby equipment equipment must be inputted. inputted. When

there is a need to withdraw from the operation owing to problems, it is a must to go through the procedures of examination and approval. When abnormal parameters happen in the operation, identified as the measuring loop or measuring elements failure, there is a must to immediately contact the thermal personnel to relieve possible protection of unwanted operation to prevent the appearance of unwanted operation. After the tripping of power equipment, there is a must to check whether the electric protection is in operation, and then confirm the thermal protection, and no longer put the equipment into operation (except for accident treatment) again when the trip reasons are not clear. Check the reasons of linkage thoroughly after the standby equipment linkage, stop the operation and carry on maintenance if it is caused by the original operation equipment failure. 3.3.3.2

Block up some some protection in an emergency emergency as to the generator generator transformer transformer unit, but the two main main

protection cannot be blocked blocked up simultaneously. simultaneously. 3.3.3.3

When the electrical equipment equipment breaks up in operation, operation, take timely actions to check the operation



conditions of protection and automatic device, report it to the value supervisor, make records at the same time, and never reset the signal until it has been reviewed without errors by the second person. 3.3.3.4

After unit tripping, tripping, the protection protection of "machine "machine lifted power" power" and "power "power skipping machine" machine" shall be

relieved. After After synchronization, immediately input the two kinds of protection. 3.3.4

Operation mode of cooling water system

3.3.4.1

The cooling water water system of circulating water, water, open water, water, and closed water water shall be kept in normal normal

operation, providing cooling water for cooling water users continuously. 3.3.4.2

Fill water to the system system first when when the circulating circulating water system is putting putting into operation. operation. Restart the

first circulating pump after the system is filled with water. Start the second circulating pump according to the situation before the unit rolling. When the circulating water system breaks up, shut down the open water system at first, then circulating pump. When the leakage of both the circulating water pump switch and stainless steel tubes of the condenser happens, the operation of the rubber ball cleaning system is prohibited. Check the operation conditions regularly of the view the cleaning machine and the rotary filtering net, and more attention shall be paid especially in the high tide period to prevent the filter net blockage. The entrance filter net of circulating water shall take regular cleaning and sewage drainage according to the provisions. 3.3.4.3 3.3.5

Mode of circulating water operation: two two circulating circulating pumps operate annually. annually. Operation mode of auxiliary steam system

3.3.5.1

When the unit starts up, auxiliary steam header shall be supplied supplied by the boiler. boiler.

3.3.5.2

After the unit starts up, auxiliary steam can be switched to the local local machine supply according according to the

situation. 3.3.5.3

During the unit unit startup, auxiliary auxiliary steam shall be supplied again by the cooling section of reheating

machine when the unit load is larger than 25%, and switch it to the four-section steam pumping supply when the unit load is larger than 70%. 3.3.5.4

Under normal circumstances, circumstances, the auxiliary auxiliary steam header header is provided by the four-stage steam

pumping. 3.3.6 3.3.6.1

Operation mode of generator seal oil system The seal oil oil system has has four operation operation modes, which which can guarantee guarantee the sealing of internal internal hydrogen hydrogen

under various working conditions. 3.3.6.2

The main oil source for operation: the normal working oil source of the air side seal oil is supplied

by AC seal oil pump with the outlet pressure pressure of 0.8Mpa. 3.3.6.3

The first standby oil source is the high pressure oil from from the main oil pump and hydrogen seal oil

standby pump of the steam turbine. The standby oil supplies the air side sealing bush by releasing the pressure of the pressure reducing valve in the pipeline, and oil pressure in the outlet of the pressure reducing valve is 0.7~0.8MPa, and the amount of oil is 250L/min. When the main oil source breaks down and the Steam Turbine Operation Manual Page 63 of 197


differential pressure of hydrogen oil drops to 0.056MPa, the standby differential pressure valve arranged in the pipeline shall automatically open. The standby oil source is automatically put into operation. 3.3.6.4

The second oil source source is also provided provided by the turbine turbine oil system. It is supplied by standby AC

electric seal oil pump of the turbine main oil tank with the oil pressure of 1.0MPa. As it is connected to the same line with the oil source of the first standby oil pump, so this standby oil source also goes into a standby differential pressure valve, and then into the sealing bush, input it when the differential pressure drops to 0.056MPa. When the coaxial speed of the turbine is more than 2/3 of the rated speed, the main shaft seal oil pump of the turbine is able to provide the first standby oil source; when rotating speed is less than 2/3 or breaks down, thus it can be only supplied by the second second standby oil source. 3.3.6.5

The third standby oil source is provided provided by the self-contained self-contained DC electric electric oil pump of the seal oil

system, and it is connected to the same line with AC electric oil pump, when the hydrogen differential pressure drops to 0.035MPa, and the DC oil pump is started, by starting which can hydrogen differential pressure return to 0.084MPa. However, as the electric source s ource capacity of the standby DC D C is limited, so the operation time of the standby DC oil pump shall not be too long and shall be in less than two hours. Examine and repair the AC oil pump as soon as possible. 3.3.6.6

The fourth standby standby oil source source is also provided by the turbine oil system. The oil pressure supplied supplied

by lubricating oil pump of the turbine bearing is as low as 0.035 ~ 0.105MPa. At this time, the hydrogen pressure inside the machine machine must be timely reduced to 0.014MPa. 3.3.7 3.3.7.1

Operation mode of hydrogen system The rated hydrogen hydrogen pressure of the machine design is 400 kPa, kPa, maintain the normal operation operation of

400 kPa, and replenish hydrogen timely when the pressure is lower than the 380 kPa, the hydrogen pressure shall be higher than that of the generator stator cooling water. Hydrogen purity shall be larger than 98%, discharge the sewage timely when it is less than 95%, and add qualified hydrogen as well. 3.3.7.2

Before the unit is started, started, the generator generator shall be filled with qualified purity hydrogen inside. After

synchronization, input the hydrogen cooler cooling water timely, and keep the cold hydrogen temperature in 44 ℃. It is necessary to ensure that the generator hydrogen input temperature is lower than the stator cooling water entrance temperature of the generator. After unit splitting, stop the operation of the hydrogen cooler cooling water and drying device. 3.3.7.3

The system works normally, normally, and the hydrogen hydrogen drying device device shall be inputted, inputted, discharge the water

promptly when there is water. water. The humidity and purity of the hydrogen shall be tested by the chemical laboratory regularly. The humidity shall not be more than -25-0 ℃ (dew point temperature under rated hydrogen pressure). Discharge the sewage when the humidity or purity is unqualified. 3.3.7.4

When making making up hydrogen, discharge the sewage of its parent parent tube first for 10 minutes before the

make-up, in order to avoid the excess moisture. Steam Turbine Operation Manual Page 64 of 197


3.3.7.5

When the machine machine hydrogen pressure pressure decreases decreases rapidly, rapidly, find the leaking of the system timely, timely, and

open the roof fan to prevent accumulation hydrogen. 3.3.7.6

Enough gas of CO2 shall be reserved on the spot in case of an emergency emergency in discharging discharging hydrogen.

When the unit is overhauled, the hydrogen in the machine must be completely discharged. Whether to discharge hydrogen depends on the time duration and work contents during minor repairs. Pay attention to the hydrogen discharge in the dead corner when discharging hydrogen. 3.4

Normal running parameter monitoring

3.4.1

Limit of steam turbine running parameters

No.

Parameter Parameter

Unit

Normal

1

Speed

r/min

3000

2

Load

MW

622

647

3

Main steam temperature

℃

538

546

4

High exhaust temperature

℃

326.6

404

5

Vacuum of condenser

kPa

90

6

Exhaust temperature

℃

<70

7

8 9 10

HP cylinder differential expansion LP cylinder differential expansion Axial displacement displacement Shaft seal vibration of main engine

Maximum

Minimum

3300

530

87 80

mm

9.5

-4.8

+10.2/-4.8

mm

+22.5

-0.26

+23.3/-1.4

mm

+0.9

-0.9

+1.0/-1.0

mm

0.125

0.254

MPa

14±0.5

16.8

11.2

12

EH oil temperature

℃

37~56

60

37

13

Lubrication pressure

MPa

0.1~0.18

14

Lubrication temperature

℃

43

15

Jacking oil pressure

MPa

5~15

℃

50~60

17

Bearing Support bearing

79.7 120(Manual operation)

EH oil pressure

Return oil temperature of

566(Manual operation) 427

11

16

Trip

0.082 46

9.3

0.048

35 5( )

65

℃

107

113

99

107

temperature

18

Temperature of thrust pad

℃

19

Main oil level of tank

mm

50

152

-152

-563

20

EH oil level of tank

mm

440-550

558

300

193

kPa

27

30.99

10

kPa

-4.5

-5.5

-2.5

mm

850~900

950

700

21

22 23

Shaft seal pressure of main engine Shaft seal and negative pressure Condenser level

300(Pump trip)



3.4.2

Limit of water water feed pump unit running running parameters parameters

No.

Parameter

Unit

Normal

Maximum

Minimum

Trip

Small turbine 1

Speed

r/min

3100-5900

6300

2

Exhaust pressure

kPa

-50.6

-30.3

3

Exhaust temperature

℃

135

150

4

Bearing Vibration

mm

0.08

0.125

5

Lubrication Lubricatio n pressure

MPa

6

Differential pressure before and after the filter of lubrication lubricati on oil

kPa

7

Lubrication temperature temperature

℃

8

Axial displacement

mm

+1.0

9

Support bearing temperature

℃

80

90

10

Temperature of thrust bearing

℃

80

95

11

Shaft seal pressure

kPa

30

12

Shaft seal temperature

℃

150~177

95

110

0.103~0.137

0.103

0.07

-1.0

1.2

137.2 40~45

Booster pump, main pump 1

Bearing temperature of booster pump

℃

2

Booster pump outlet flow

t/h

3

Entrance filter differential pressure of booster pump

kPa

60

4

Bearing temperature booster pump motor

℃

80

90

5

Winding temperature booster pump motor

℃

120

130

6

Main thrust of pump bearing temperature

℃

80

95

7

Main support of pump bearing temperature

℃

75

90

8

Seal water temperature temperatur e of main pump machine

℃

80

90

280

Electric pump 1

Bearing temperature of booster pump support

℃

75

90

2

Motor support bearing temperature

℃

85

95

3

Motor winding temperature

℃

120

130

4

Bearing temperature of main pump support

℃

75

90

5

Bearing temperature main thrust of pump

℃

75

90

6

Seal water temperature temperatur e of main pump machine

℃

80

90

7

Coupler support bearing temperature

℃

75

95

8

Bearing temperature of coupler thrust

℃

90

95

9

Bearing vibration of main pump support

mm

0.100

0.125

10

Lubrication oil pressure

kPa

11

Filter differential pressure of Lubricating Lubricatin g oil

kPa

60

12

Oil temperature of oil cooler entrance

℃

110

130

13

Oil temperature of oil cooler outlet

℃

75

85

14

Oil temperature of lubrication lubricati on oil cooler entrance

℃

65

75

15

Oil temperature of lubrication lubricati on oil cooler outlet

℃

55

60

16

cylinder temperature difference of main pump inlet and outlet

℃

25


220~350

150

80


No.

Parameter

Unit

Normal

t/h

686

Maximum

Minimum

Trip

210

175

end 17

Main pump entrance flow

3.4.3 No. 1

2

3

4

5

6

3.4.4

Limit of HP/LP HP/LP heater and deaerator running parameters parameters Parameter Parameter #1 water level of high pressure heater #2 water level of high pressure heater #3 water level of high pressure heater #5 water level of low pressure heater #6 water level of low pressure heater Water level of deaerator

Unit

Normal

Maximum

Minimum

Split

mm

0

-684(I),-634(II) -684(I),- 634(II)

-760

-584

mm

0

-684(I),-634(II) -684(I),- 634(II)

-760

-584

mm

0

-684(I),-634(II) -684(I),- 634(II)

-760

-584

mm

0

-534.(I),-493(II) -534.(I), -493(II)

-619.5

-443.5

mm

0

-534(I),-493(II) -534(I),- 493(II)

-619.5

-443.5

mm

2550

870(I),970(II)

570

1170(Ⅲ)

Limit of generator generator hydrogen, hydrogen, oil, water system running parameters parameters

No.

Parameter

Unit

Normal

Maximum

Minimum

1

Hydrogen pressure inside machine

kPa

500

520

480

2

Cold hydrogen temperature inside machine

℃

44 441

55

3

Hydrogen pressure

kPa

4

Hydrogen purity inside machine

%

98

5

Hydrogen humidity inside machine

℃

-5

6

Outlet pressure of seal oil pump

MPa

1.0

7

Oil hydrogen pressure

kPa

84

8

Outlet pressure of stator cooling water pump

kPa

0.4

9

Stator cooling water flow

t/h

116

10

Inlet temperature of stator cooling water

℃

45-50

11

Outlet temperature of stator cooling water

℃

69-75

12

Conductivity of stator cooling water

us/cm

3.4.5 3.4.5.1 No.

700

Note

550 95

0

-25 0.657

94

Combined pump

56

127.6

400

Combined pump

104

93 Generator trip

85

90

1.0-1.5

9.5 Breakdown

Limit of other turbine running parameters Pumps and auxiliary steam Parameter Entrance filter differential pressure of condensate pump

Unit MPa

Normal

Maximum

Minimum

0.04



No.

Parameter Parameter

Unit

Entrance filter differential pressure of closed type pump Entrance filter differential pressure of open water Entrance filter differential pressure of condensate pump Entrance filter differential pressure of boiler feed pump pump Entrance filter differential pressure of shutdown cooling water pump Filter differential differential pressure of stator water Pressure of auxiliary steam header used

Maximum

MPa

0.02

kPa

0.06

MPa

0.02

MPa

0.02

MPa

0.02

MPa

0.021

kPa

by factory

3.4.5.2

Normal

600~800

Minimum

1250

Standards of water and steam quality Control index Name

Item 3.8-5.8 MPa

5.9-12.6MPa 5.9-12.6MP a

12.7-15.6MPa 12.7-15.6MP a

15.7-18.3MPa 15.7-18.3MP a

Solidity(umol/L) Solidity(umol/L)

0

0

0

0

Silicon dioxide(ug/L) dioxide(ug/L)

≤100

≤20

≤20

≤20

Conductivity (uS/cm)

≤5

≤0.2

≤0.2

≤0.2

Solidity(umol/L)

≤1.0

≤0.3

=0

=0

Dissolve of oxygen(ug/L)

≤15

7

≤7

≤7

Iron(ug/L)

≤50

≤30

≤20

≤15

Feed

Copper(ug/L)

≤10

≤5

≤5

≤5

water


Supplemental water

Boiler water

≤20

Hydrazine(ug/L)

<30

<30

<30

<30

pH

9.0~9.6

9.0~9.6

9.0~9.6

9.0~9.6

DDH

≤0.3

≤0.3

≤0.3

pH

9~9.8

9~9.7

9~9.7

Phosphate radical(mg/L)

1.5~3

0.5~3

0.3~2

Conductivity (uS/cm)

≤60

≤40

≤30

Silicon dioxide(mg/L) dioxide(mg/L)

2.0

0.45

≤0.25

≤2

≤0.5

Chloridion(mg/L)

Steam

Natrium(ug/kg) Natrium(ug/kg)

≤15

≤10

≤10

≤10

Silicon dioxide(ug/kg)

≤20

≤20

≤20

≤20

≤20

≤20

Iron (ug/kg)



Control index Name

Item 3.8-5.8 MPa

5.9-12.6MPa 5.9-12.6MP a

12.7-15.6MPa 12.7-15.6MP a

15.7-18.3MPa 15.7-18.3MP a

≤5

≤5

≤0.3

≤0.3

≤0.3

Copper(ug/kg) Conductivity(uS/cm) Solidity(umol/L)

≤3.0

≤2.0

≤2.0

0

Dissolve of oxygen (ug/L)

≤50

≤50

≤40

≤30

conductivity(uS/cm)

≤0.3

≤0.3

Natrium(ug/L) Natrium(ug/L)

≤10

≤10

Condensate water


≤15

Solidity(umol/L) Solidity(umol/L)

=0

=0

Conductivity(uS/cm)

≤0.15

≤0.15

Natrium(ug/L) Natrium(ug/L)

≤10

≤10


≤20

≤20

Iron(ug/L)

≤8

≤8

Copper(ug/L)

≤3

≤3

Coagulation outlet

3.4.5.3

Internal cooling water

Name

Internal

Standard

Control standard

Conductivity(μs/cm) (25 ℃)

≤2.0

≤2.0

PH(25℃)

>6.8

9>PH>7.0

Solidity(μmol/L)

0

0

Copper(μg/L)

≤40

≤28

cooling water

3.4.5.4

Index

Item

Quality standard of steam turbine new oil

No.

Item

1

Quality standard #20

#32

Appearance

Transparent

Transparent

2

Mechanical admixture

Nought

Nought

3

Kinematic viscosity (mm 2/s)

18-22

28-32

4

Open flash point ( ℃)

≮180

≮180

5

Solidifying point (℃)

≯-15

≯-15

6

Acid value (mg KOH/g)

≯0.03

≯0.03

7

Oxidizing acid value (mg KOH/g)

≯0.2

≯0.2

8

Post-oxidation Post-oxid ation sediments (%)

≯0.1

≯0.1

9

Demulsification Demulsificat ion degree (min)

≯8

≯8

10

Water soluble acid and alkali

Nought

Nought

11

Sodium hydroxide test(Level)

2

2

Note

30 ℃



3.4.5.5

Quality criteria of turbine oil Monitoring method or using

No.

Item

Quality standard standard

1

Appearance

Transparent

Visual inspection on appearance

2

Water

Nought

Visual inspection or YS-12-1-78

3

Kinematic viscosity (mm 2/s)

4

Flash point(℃)

5

Mechanical admixture

Nought

6

Acid value(mg KOH/g)

0.2

GB264-83

7

Liquid rust

No rust

YS-21-1-84

8

Demulsificati on degree (min)

 60

YS-C-1-1-84

3.5 3.5.1

Less than or equal to 1.2 times of new

No less than 8 ℃ of the previous

YS-9-1-84

GB267-77

measured value

GB511-77 or visual inspection on appearance

Normal operation of regular work Work content content

1

Thermal signal test Outlet cleaning of cleaning machine in circulating pump filter

Work date

Work order

Operator

Once on

On work

Vice duty

each duty

time

officer

Once on

Inspector

each duty

Water level gauge of 3

GB265-75

oil standard

Regular jobs of the equipment

No.

2

standard

deaerator and condenser

Once on

on the spot remote

each duty

Supervisor

Requirements Requirements

-

Normal light and sound

-

Duty officer and

-

inspector

proofing

Timely cleaning of more dirty water

Unanimous directions of instruments

Linkage of alternating 4

and direct pump of host,

8th of each

Work in the

Duty

Headman of

hand operation start test;

month

morning

officer

unit

8th of each

Work in the

Duty

Headman of

month

afternoon

officer

unit

Main pump switch of

8th of each

Work at

Duty

Headman of

small machine

month

late night

officer

unit

Inspector

Duty officer

Inspector

Duty officer

high pump start test 5

6

7

Condensate pump switch

Mechanical vacuum pump switch switch

th

9 of each

Work at

month

late night

th

8

Closed pump switch

9 of each

Work in the

month

afternoon


Continuous operation of DC pump shall shall be more than than 10 min Measuring insulation before the start Measuring insulation before the start


No.

9

10

11

12

Work content content

Open pump switch

EH oil pump switch

Auxiliary axial switch

month

Work order

former

month

afternoon

month

pump

month

Supervisor

Inspector

Duty officer

night Work in the

10th of each

Operator

Work at

10th of each

11th of each

Inspector

Measuring insulation before the start

unit

Work at former

Inspector

Duty officer

Duty

Headman of

officer

unit

Inspector

-

night Work at former night

Continuous operation of DC pump shall shall be more than than 10 min

Work at

month

late night

Stator cooling water

12th of each

Work in the

Duty

Headman of

pump switch switch

month

morning

officer

unit

12th of each

Work in the

month

afternoon

host oil tank and small


Headman of

12th of each

machines of A and B 14

9th of each

Start test on DC seal oil

Water discharge of the 13

Work date

Low pressure test of electric auxiliary oil 15

pump and regular regular start and stop test of electric

Continuous operation of Inspector

Duty officer

pump shall shall be more than than 10 min

pump Main oil tank 16

exhaust fan and air side

12th of each

of generator exhaust fan

month

switch 17

Duty officer

night Work in the

Duty

Headman of

main engine

month

morning

officer

unit

Duty

Headman of

officer

unit

Inspector

-

Headman

Shift

Executive at downtime

of unit

supervisor

opportunity each year

Inspector

Duty officer

LP of small machine’s

Vent hydrogen test of stator water tank and main oil tank

13th of each month

Work at former night

13th of each

Work in the

month

afternoon

Leakage test of main 20

Inspector

13th of each

main valve

19

former

Vacuum tightness test of

Activity test of HP and 18

Work at

steam valve and

Once a year

adjusting valve Inspection test of 21

hydrogen leakage in generator

15th of each

Work in the

month

morning

550MW≥Load≥480MW

No jam after after low load

Start at 11 a.m. and end at 11 a.m. the nest day.



No.

Work content content Activity test of main

22

engine exhaust check valve

Work date

Work order

15th of each

Work at

month

late night

Operator

Supervisor


Inspector

Duty officer

300MW-400MW

When the load is less than 8th, 14th, 20th,

Activity test of main 23

Work at

th

engine’s HP main steam steam

and 26 of

former

valve and adjusting valve

each month

night

Duty

Headman of

officer

unit

420MW, monitoring of normal action on the spot, and contact thermal to complete.

After

24

Action test of emergency protector

overhaul or

duty

Headman of

officer

unit

Inspector

Duty officer

unit operation for

Implementation in each quarter in machine start time

six month 25

Sewage drainage of

15th of each

Work in the

sealing filter net

month

afternoon Work in

26

Oil filter switch

early

Vice duty officer

morning

3.5.2

Notice the seal oil pressure Differential pressure before

Duty officer

and behind

filter shall be

no less than 0.05Mpa

Work before and after inspection of equipment

No.

Item

Requirements Requirements Test for two times after overhaul, action speed shall be 3300 ~

1

Overspeed test of turbine

3330r/min, rotating speed difference of two times isles than 18r/min

2

Oiling and overspeed test of emergency protector

After maintenance or operation of 6 ~ 12 months

3

Main protection of machine, oven and electricity electricit y

After unit overhaul and maintenance

4

Interlock and protection test of auxiliary turbines


5

Electric valve and pneumatic valve test


6

Static test of steam turbine governing system

After overhaul or speed control system adjusted

7

Leakage test of main steam valve and adjustment valve

Before and after unit overhaul

Safety check on each valve of HP, LP heater, 8

deaerator, auxiliary steam system, and boiler

After overhaul or safety valve adjustment

steam system 9

Water pressure test of deaerator

Once every six years

10

Overspeed test of small turbine

After overhaul or speed control system adjusted

11

Thermal test of unit

Once both before and after overhaul

3.6 3.6.1

Unit interlock protection and test Steam turbine interlock protection



3.6.1.1

Main protection of steam turbine

(1) Overspeed mechanical releasing Mechanical emergency breaker acts to release low pressure security oil through mechanical emergency breaker slide valve when steam turbine rotation rate reaches 110%~111% 110%~111% of rated rotation rate, open diaphragm valve to make AST oil protopipe drain oil, close high and intermediate pressure main throttle valves and high and intermediate regulating valves, and shut down the machine after closing each level steam extraction check valve and high drainage check valve. (2) On-site manual mechanical releasing This mechanical release is in the steam turbine front box. Push manual breaker lever from “normal” position to “breaking” position when carrying out operation, release low pressure security oil through mechanical emergency emergency breaker slide valve, open diaphragm valve to make AST oil protopipe drain oil, close high and intermediate pressure main throttle valves and high and intermediate regulating valves, and shut down the machine after closing each level steam extraction check valve and high drainage check valve. (3) Remote manual releasing It has two buttons which are installed on the DEH panel of central control room. Press the two buttons simultaneously when carrying out operation, and the four automatic shutdown emergency breaking protection solenoid valve (AST-1.2.3.4) power-losing acts to make AST oil protopipe drain oil. Close high and intermediate pressure main throttle valves and high and intermediate regulating valves, and shut down the machine after closing each level steam extraction check valve and high drainage check valve (4) Automatic shutdown emergency protection solenoid valve (AST-1.2.3.4) acts jumping when unit occurs one of the following abnormal conditions. a. Unit shaft vibration reaches 0.25mm; b. Main engine lubricating oil oil pressure is 0.049MPa; c. Thrust bearing wear is great and axial displacement reaches ±1.0 mm; d. EH oil pressure is ≤9.3MPa; e. Condenser vacuum is ≤79.7kPa; f. HP differential expansion reaches 10.2mm (rotor extends) or – 4.8mm 4.8mm (rotor shortens); g. LP differential expansion reaches 23.3mm (rotor extends) or – 1.4 1.4 mm (rotor shortens); h. HP cylinder exhaust steam temperature is higher than 427 ℃; i. Turbine pressure ratio is ≤1.7; j. Bearing metal temperature temperature supported by steam steam turbine generator unit unit reaches 113 113 ℃; k. Steam turbine thrust bearing metal temperature reaches 107 ℃; l. DEH TSI overspeed is ≥3300r/min; m. Generator main protective action (electric jump engine); Steam Turbine Operation Manual Page 73 of 197


n. Boiler MFT (boiler jump engine); o. DEH power-losing. (5) Manual application of brake for shutdown when steam turbine occurs one of the following conditions a. Steam overspeed protective device does not act; b. Unit occurs violent vibration vibration but protective device device doesn’t acts; acts; c. Blade of steam turbine breaks or has clear metal grating sound inside the cylinder stator; d. Steam turbine occurs water attack; e. Steam turbine shaft seal occurs grating sound or bursts out spark; f. Any shaft of steam turbine is fuel cut or smoking; g. Surroundings of steam turbine generator unit or oil s ystem catches fire, and can’t be distinguished and seriously endanger unit safety; h. Generator unit inside smokes or hydrogen explodes; i. LP cylinder exhaust steam temperature is between 80~120 ℃, operation time exceeds 15min or temperature is higher than 120 ℃; j. Upper and lower cylinder metal temperature difference of high and intermediate cylinder reaches 56℃; k. Main steam temperature exceeds 566 ℃; l. Return steam temperature exceeds 566℃; m. Main and return heat temperature decreases to 454 ℃; n. Bearing oil return temperature is higher than 82 ℃; o. Main engine lubricating oil box oil level is lower than -300mm; p. Control value reaches reaches protective device device operate value value but protection refuses acting. acting. 3.6.1.2

OPC interlock protection

(1) Generator is splitting when load is ≥30% of rated load, overspeed limit solenoid valve acts, release overspeed limit oil (OPC) and regulating steam valves close rapidly under the effect of valve manipulation spring force and steam pressure. When rotation rate decreases below 3000r/min, overspeed limit solenoid valve resets, reopen each regulating steam valves and maintain steam turbine 3000r/min. (2) Rotating speed reaches 103% of rated rotating speed, overspeed limit solenoid valve acts, release overspeed limit oil (OPC) and regulating steam valves close rapidly under the effect of valve manipulation spring force and steam pressure. When rotation rate decreases below 3000r/min, overspeed limit solenoid valve resets, reopen each regulating steam valves and maintain steam turbine 3000r/min. 3.6.1.3

Main engine oil system interlock protection

(1) AC lubrication pump starts up automatically when bearing lubricating oil pressure is lower than Steam Turbine Operation Manual Page 74 of 197


0.0823MPa; (2) DC lubrication pump starts up automatically when bearing lubricating oil pressure is lower than 0.076MPa; (3) Engine jumps when bearing lubricating oil pressure is lower than 0.048MPa; (4) Prevent barring startup when bearing lubricating oil pressure is lower than 0.031MPa; (5) Jacking oil pump shuts down automatically when jacking oil pump inlet oil pressure is lower than 0.02MPa; (6) Jacking oil pump shuts down automatically when steam turbine rotating speed is >2000 r/min; jacking oil pump starts up automatically automatically when steam turbine rotating speed is <2000 r/min; r/min; (7) Electric heating puts into operation automatically when oil temperature in the main engine oil box is lower than 10 ℃ and electric heating shuts down automatically when the temperature is higher than 38 ℃; (8) Standby EH oil pump starts up automatically when EH oil pressure is lower than 11.2MPa; (9) Electric heating puts into operation when EH oil temperature is lower than 21 ℃ and electric heating shuts down when the temperature is higher than 56 ℃; (10) Put cooling cooling water solenoid valve valve into operation operation

and circulating pump starts up automatically

when EH oil temperature is higher than 56 ℃; close cooling water solenoid valve and circulating pump shuts down automatically when EH oil temperature is lower than 37 ℃; (11) Pump jumps when EH oil box oil level is lower than 193mm; 3.6.1.4

LP exhaust steam cylinder water spray protection interlock

(1) LP exhaust steam cylinder water spray is automatic control, and begins to spray water when rotating speed reaches to 2600r/min until unit is 15% load. (2) Put into LP exhaust steam cylinder water spray system automatically when LP exhaust steam cylinder temperature reaches 80 ℃; shut down LP exhaust water spray system automatically when LP cylinder exhaust steam temperature reaches 70 ℃. 3.6.1.5

Bypass system protection

(1) HP bypass control valve automatic close conditions are: a. Give an alarm when reheater pressure is high (1.5MPa); b. Post HP bypass steam temperature temperature is 380℃; c. HP bypass attemperation water pressure is ≤4MPa; d. LP bypass valve closes and connects with HP bypass. (2) LP bypass control valve automatic close conditions are: a. HP and LP condenser vacuum is low to 79.7KPa. b. HP and and LP condenser exhaust steam temperature is ≥120 ℃. c. Condenser hot water well level is high to 1300mm. Steam Turbine Operation Manual Page 75 of 197


d. LP bypass outlet temperature is high to 160 ℃. e. LP bypass attemperation water pressure is low to 1.5MPa. 3.6.1.6

Main engine barring device interlock protection

(1) Barring motor automatic startup condition: a. Barring motor interlock switch is at “automatic”; b. Bearing lubricating oil pressure pressure is >0.031MPa; c. Each jacking oil pressure is not low; d. Barring motor has no electrical fault; e. Barring device device is at “automatic”; f. Steam turbine has tripped; g. Steam turbine rotating speed is zero. (2) Barring motor trips when one of the following conditions occurs: a. Any jacking oil pressure is <4.2MPa; b. Bearing lubricating oil pressure pressure is <0.031MPa; c. Barring motor is electrical fault. 3.6.1.7

Steam turbine water induction prevention protection

(1) Combined intermediate valve rear steam turbine main body and drain valve on the connecting pipe opens automatically when steam turbine load is lower than 20%; combined intermediate valve front steam turbine main body and drain valve on the connecting pipe opens automatically when steam turbine load is lower than 10%. (2) After ignition of the boiler, inspect whether operation of condensate system, circulating water system and vacuum system are normal, and open all the drain valves at engine side. When load is higher than 20%, close all the drain valves. Combined intermediate valve rear steam turbine main body and drain valve on the connecting pipe opens automatically when load is lower than 20% during shutdown process; combined intermediate valve front steam turbine main body and drain valve on the connecting pipe opens automatically when steam turbine load is lower than 10%. 3.6.1.8

High water adding level protection

(1) Giver Giver an alarm when HP heater’s water level is High I value ( -684mm); (2) Open HP heater emergency drain valve in combination when HP heater’s water level is High II valve (-684mm); (3) HP heater is splitting, HP heater water side goes bypass, close HP heater steam extraction electric separating valve and steam extraction check valve and open steam extraction pipe drain valve at the same time when any two of HP water level High III value (-584mm) switching value, High III value analog quantity and High II value switching value reach protection values. Steam Turbine Operation Manual Page 76 of 197


(4) Give an alarm when HP water level is Low I value (-760mm); 3.6.1.9

LP water level protection

(1) Give an alarm when LP water level is High I value (-543mm); (2) Open LP heater emergency drain valve in combination wh en LP heater’s water level is Low II valve (-493mm); (3) LP heater is splitting, LP heater water side goes bypass, close LP heater steam extraction electric separating valve and check valve and open steam extraction pipe drain valve at the same time when any two of heater water level High III value (-443mm) switching value, High III value analog quantity and High II value switching value reach protection values, and the upper level LP heater stream trap valve switches to condenser automatically. automatically. (4) Give an alarm when LP water level is Low I value (-619mm); 3.6.1.10

Deaerator water level and pressure protection

(1) Close four sections of steam extraction to deaerator electric separation valve in linkage, open standby steam source electric valve in linkage and put standby steam source into operation (HP heater is divided into four sections of steam extraction before putting into operation) when deaerator pressure is lower than 0.15MPa; (2) Close standby steam source electric valve in linkage and open four sections of steam extraction to deaerator electric valve in linkage when deaerator pressure is higher than 0.15MPa; (3) Give an alarm when deaerator water level is High I value (+870mm); open overflow electric valve in linkage. (4) Open deaerator accident water drain valve in linkage when deaerator water level is High II value (+970mm); (5) Close four sections of steam extraction to deaerator steam inlet electric valve and check valve in linkage when deaerator water level is High III value (+1170mm), close #3 HP heater to deaerator normal drain valve in linkage, and open #3 HP heater to condenser drain valve in linkage; trip condensate pump in linkage and open quding discharge casing electric valve; (6) Give an alarm when deaerator water level is Low I value (570mm); (7) Trip steam pump booster pump and electric pump in linkage when deaerator water level is Low II value (-1360mm) and deaerator is Low I value switch motion; (8) When water supply flow is greater than 30%, allow deaerator water level automatically switches to three impulses from single impulse. 3.6.1.11

Steam extraction check valve interlocking:

(1) When steam extraction check valves and HP cylinder exhaust steam check valves are at the “automatic” position, and steam turbine main steam valve releasing closes, close clo se the above valves in linkage. Steam Turbine Operation Manual Page 77 of 197


(2) When steam extraction check valves and HP cylinder exhaust steam check valves are at the “manual” position, each valve can be opened and closed closed individually. individually. 3.6.1.12

Pump equipmen interlocking

(1) Put standby pump into operation in linkage when condensate pump trips or outlet protopipe pressure is lower than 2.65MPa. (2) Put standby pump into operation in linkage when circulating water pump trips. (3) Put standby pump into operation in linkage when vacuum pump trips. (4) Put standby pump into operation in linkage when open type cooling water circulating water pump trips or outlet protopipe pressure is lower than 0.15MPa. (5) Put standby pump into operation in linkage when closed cooling water circulating water pump trips or outlet protopipe pressure is lower than 0.4MPa. (6) Put standby pump into operation in linkage when stator water-cooling pump trips or outlet protopipe pressure is lower than than 0.4MPa. (7) Put smoke exhaust fan into operation in linkage when main engine fuel tank smoke exhaust fan trips. 3.6.1.13

Steam feed pump unit main protection

(1) On-site shutdown button a. Press “emergency shutdown” button manually on the small turbine front bearing box, shutdown solenoid valve acts, leaks small turbine control oil and closes HP/LP main steam valve and regulating valve shutdown. b. Press “emergency “emergency shutdown” button manually on the on-site on -site operation board, shutdown solenoid valve acts, leaks small turbine control oil and closes HP/LP main main steam valve and regulating valve shutdown. c. Press “trip” button on the DCS control picture, shutdown solenoid valve acts, leaks small turbine control oil and closes HP/LP main steam valve and regulating valve shutdown. (2) Remote shutdown button (3) Protective action carries out shutdown when steam feed pump unit occurs one of the following abnormal conditions: a. Small turbine bearing vibration is high to 0.125mm; b. Small turbine rotor axial axial displacement is greater greater than ±0.1.2mm; c. Small turbine lubricating oil pressure is low to 0.07MPa; d. Steam extraction vacuum is low to 30.3kPa; e. Small turbine overspeed is to 6300 (electric overspeed) r/min(two r/min(two out of three); f. Small turbine steam extraction temperature is 150 ℃; g. Booster pump shuts down; h. MEH is power losing; Steam Turbine Operation Manual Page 78 of 197


i. Small turbine LP safety oil pressure is too low to 0.25MPa; j. Small turbine oil tank level level is low to 400mm; k. Inflow and effluent side bearing metal temperature of steam feed pump is ≥90 ℃; l. Thrust bearing metal temperature of steam feed pump is ≥95 ℃; m. Inflow and effluent effluen t side mechanical seal temperature of steam feed pump is ≥90 ℃; n. Inlet flow of steam feed pump is <175t/h and re-circulating valve non-open delay is 15s; o. Inlet pressure of steam feed pump is low to 0.78MPa (3 out of 4); p. Deaerator water water level is Low III value -1360mm. q. Press on-site accident button. 3.6.1.14

Steam pump booster pump tripping protection

(1) Deaerator water level is Low III value -1360mm. (2) Bearing temperature of booster pump drive end and non-drive non- drive end is ≥110℃; (3) Bearing temperature of booster pump motor drive end and non- drive end is ≥90℃; (4) Close booster pump inlet valve; (5) Steam feed pump inlet flow is <233t/h and re-circulating valve non-open non-open delay is 15s; (6) Press on-site accident button. 3.6.1.15

Electric feed pump tripping protection

(1) Electric pump inlet flow is lower than 175t/h and minimum flow valve non-open delay is 15s. (2) Deaerator water level is Low III value -1360mm. (3) Inlet pressure of electric pump is low to 0.78MPa and delays 3s (3 out of 4); (4) Electric pump trips when oil pressure after electric pump lubricating oil filter is ≤0.08 MPa. (5) Give an alarm when electric pump inlet and outlet end transverse bearing temperature is ≥75 ℃ and electric pump trips when the temperature is ≥90 ℃. (6) Give an alarm when electric pump thrust bearing temperature is ≥75 ℃ and electric pump trips when the temperature is ≥90 ℃. (7) Give an alarm when electric pump electromotor coupler bearing temperature is ≥75 ℃ and electric pump trips when the temperature temperature is ≥90℃. (8) Give an alarm when electric pump booster pump drive end and non-drive end transverse bearing temperature is ≥75 ℃ and electric pump trips when the temperature is ≥90 ℃. (9) Give an alarm when electric pump booster pump non-drive non- drive end thrust bearing temperature is ≥80 ℃ and electric pump trips when the temperature is ≥95 ℃. (10) Give an alarm ala rm when electric pump inlet and outlet end sealing water temperature is ≥80 ℃ and electric pump trips when the temperature is ≥90 ℃. (11) Give an alarm when electric pump motor drive end and non-drive end transverse bearing Steam Turbine Operation Manual Page 79 of 197


temperature is ≥75 ℃ and electric pump p ump trips when the temperature is ≥90 ℃. (12) Give an alarm when electric pump hydraulic coupler transverse bearing temperature is ≥75 ℃ and electric pump trips when the temperature is ≥90 ℃. (13) Give an alarm when electric pump lubricating oil cooler inlet oil temperature is ≥65 ℃ and electric pump trips when the temperature temperature is ≥75℃. (14) Give an alarm when electric pump lubricating oil cooler outlet oil temperature is ≥55 ℃ and electric pump trips when the temperature temperature is ≥60℃. (15) Give an alarm when electric pump coupler working oil cooler inlet oil temperature is ≥110℃ and electric pump trips when the temperature is ≥130 ℃. (16) Give an alarm when electric pump coupler working oil cooler outlet oil temperature is ≥65 ℃ and electric pump trips when the temperature temperature is ≥75℃. (17) Press on-site accident button. 3.6.1.16

Electrically driven feed pump oil system interlock protection

(1) Shut down auxiliary oil pump in linkage when oil pressure after electric pump lubricating oil filter is ≥0.22 MPa during electric pump oper ation. ation. (2) Start up auxiliary oil pump in linkage when oil pressure after electric pump lubricating oil filter is ≤0.15 MPa during electric pump operation. (3) Oil pressure after electric pump working oil filter is n ormal 0.3 MPa0.1 MPa. (6) Working Working oil pressure after electric scoop is normal >0.15 MPa. 3.6.1.17

Condensate pump tripping protection

(1) Upper and and lower bearing temperatures of condensate pump motor are ≥95 ℃; (2) Motor thrust bearing of condensate pump is ≥80 ℃; (3) Inlet valve of condensate pump has been closed; (4) X and Y direction vibrations of condensate pump are ≥125mm; (5) Condensation water flow is ≤380t/h and condensation water re-circulating valve non-open delay is 15s; (6) Hot water well level is Low II value ≤300mm; (7) Condensate pump motor stator coil temperature is high ≥130 ℃; (8) Press on-site accident button. 3.6.1.18

Generator hydrogen, oil and water system interlock protection

(1) Start up DC sealing oil pump in linkage when front and rear differential pressure of air side AC sealing oil pump is less than 0.035MPa; Steam Turbine Operation Manual Page 80 of 197


(2) When main oil pump works, air side AC oil pump runs, standby differential pressure valve acts when hydrogen and oil differential pressure decreases to 0.056MPa, and the first standby oil source puts into operation automatically; (3) When main oil pump doesn’t work normally, normally, air side AC oil pump runs, HP sealing oil standby pump p ump starts up automatically and standby differential pressure valve acts when hydrogen and oil differential pressure decreases decreases to 0.035MPa, and the the second standby oil source source puts into operation automatically; automatically; (4) Air side AC oil pump runs, and the third standby oil source air side standby oil pump puts into operation automatically when hydrogen and oil differential pressure is 0.035MPa; (5) Stator water pump inlet and outlet differential pressure is <0.14MPa and s tarts up standby pump after delaying 3-5s; (6) Open water replenishing solenoid valve when stator water tank level is lower than 450mm; (7) Generator trips after delaying 30s when stator water flow is slower than 1/2 rated flow. flow. 3.6.1.19

Other interlock protection of steam turbine

(1) Standby condensate pump is linkage when condensate pump outlet protopipe pressure is lower than 2.65MPa; (2) Condensate delivery pump trips when 300m3 water tank level is ≤1.2m; (3) Standby open type pump is linkage when open type pump outlet mother pressure is lower than 0.15MPa; (4) Standby closed pump is linkage when closed pump outlet mother pressure is lower than 0.4MPa; (5) Closed pump trips when closed water tank level is lower than 700mm; (6) Standby vacuum pump is linkage when condenser vacuum is lower than -75kPa; (7) Give an alarm when condenser hot well water level is high 710mm; (8) Condensate pump trips when condenser hot well water level is low 300mm; (9) Give an alarm when condensate pump motor coil temperature is high 120℃; 3.6.2

Unit test

3.6.2.1

Unit interlock protection test

Equipment and system interlock protection test shall be carried out by thermo-technical personnel to simulate various linkages and tripping operating conditions after meeting test conditions (thermo-technical personnel force it when conditions are not met), in order to observe whether action and alarm condition are normal. 3.6.2.2

Electric valve (baffle) and pneumatic pneumatic valve valve (baffle) (baffle) test

Confirm whether electric valve (baffle) change direction is correct, pneumatic valve (baffle) switch is correct and light signal state indication is correction during test. Record switching time and action dead zone condition of valves (baffles). Steam Turbine Operation Manual Page 81 of 197


3.6.2.3

Inlet valve test

Test provisions and precautions (1) DEH selects “automatic” mode and DCS and DCS calls out relevant picture. (2) DEH must be at “single valve” control mode, for the test, load shall be within 5%~69% of rated load and main steam pressure shall be within 25%~100% of rated pressure, prohibit performing test not in the said scope, and put power feedback into operation during test. (3) Carry out test in accordance with the sequence of left side first then right side and prohibit performing the left side and right side test at the same time (loop is also closed); closed); carry out the test of the other side after stable running for 5min when test of one side valve is over. (4) Pay attention to monitoring parameters of load, main re-heat steam pressure, temperature, bearing metal temperature, vibration and axial displacement during test. (5) Contact with thermo-technical personnel to coordinate with the test on site. Stop test immediately if occurring abnormal change during test or control device switches to manual operation, return to valve operation manually and resume test after finding out abnormity. (6) Confirm whether valve action is normal and whether there is jamming phenomenon on site during test, and record valve test time of each side. (7) Don’t allow carrying out total excursion valve test but loosening test when carrying out DEH manual operation. (8) This test is prescribed to be performed once a week. Take running record, and test period can be extended to once two weeks if encountering special conditions and after approval of leader. leader. 3.6.2.4

Test methods of high pressure main main steam valve and intermediate pressure main steam valve valve

(1) Confirm DEH is at “automatic” mode, “single valve” key is on and power feedback puts into operation. (2) Unit load and pressure meet specified scope. (3) Click “TV1” and “test” (take #1 HP main steam valve as a n example) buttons on the DEH picture, and test begins after buttons change color; (4) Close the regulating steam valve GV1/GV4 at the same side with main steam valve within 60s, close main steam valve within 1s after closing regulating steam valve, close DCS picture and on-site confirmation valve, and actions are flexible. (5) After closing “TV1”, recover to the original state, open “TV1” ,then open regulating steam valves GV1/GV4 in sequence and open DCS picture and on-site confirmation valve. (6) Press “suspend test” key if finding abnormal condition during closing or opening process, and valves recover to the state before test. (7) Perform other main steam valve tests as per the above test procedure. Steam Turbine Operation Manual Page 82 of 197


3.6.2.5

Steam extraction check valve test

(1) Place steam extraction ex traction check valve test switch at the “test” position on site. (2) Observe check valves and check valves shall be closed freely and without jamming. (3) Place test switch at the normal position as soon as possible and confirm check valve is open. (4) Closure time shall not be too long during test and pay attention to unit load and axial displacement change. (5) Carry out activity test for each steam extraction check valve one by one by the same test procedure. Don’t do the test for HP extraction check valve. val ve. 3.6.2.6

Low oil pressure pressure linkage test of auxiliary auxiliary lubrication pump, hydrogen sealing oil standby pump and

DC lubrication pump (1) Inspect the above oil pump operation switch is placed at “interlock” position. Testers on site keep contact with central control room and open test oil leakage valve slowly. slowly. (2) Observe test oil pressure gage indication, record oil pump oil pressure during linkage respectively and inspect whether oil pump runs normally. (3) Shut down linkage oil pump. (4) Place test oil pump operation opera tion switch at “automatic”. 3.6.2.7

Jacking oil pump pump and barring low oil pressure protective test

(1) Main engine oil system and sealing oil system run normally. (2) Jacking oil and barring system run normally. (3) Contact with thermo-technical personnel to do low oil pressure test. (4) Record oil pressure of jacking oil and barring tripping. 3.6.2.8

Main engine protective device test

(1) Test provisions and precautions a. Carry out periodic test once a month during unit running, take test record and carry out comparison analysis with the former test record; b. Find out causes and eliminate eliminate it if finding errors. errors. c. Unit overhaul and maintenance, carry out this test after verification and setting of protective device and before steam engine starts up, but oil control overspeed tripping valve test shall be carried out when rotating speed is 3000r/min. d. Steam engine cold start speed rises to 3000r/min, and rise load parallelly only after protective test is qualified. e. Production Director and Professional Engineer of this test shall be on site and strictly execute operation supervision system, assigning special person for operation and supervision. f. Carry out test after confirming unit runs stably and normally before test and test meter indications are Steam Turbine Operation Manual Page 83 of 197


accurate. (2) Accident releasing device test Low EH oil pressure test method: a. Select “on“on -line test” on the emergency tripping system DCS. b. Press “A side low EH oil pressure test” button and A side test channel light is on. c. Inspect whether low EH oil pressure #1, #3 and tripping channel #1 are on. d. Press “tripping reset” button and tripping channel #1 light is off. e. Do B side EH oil pressure test by the same method. Do “low lubrication pressure” and “low vacuum” tests by the same method with the above, and pre ss corresponding test buttons when only doing test. (3) Emergency governor governor fly ball oil injection test a. Place test handle at the test position and keep it at this position. b. Open test valve slowly, slowly, tripping heavy punch stretches and impact tripping trigger when reaching certain oil pressure, emergency tripping oil discharges and read oil pressure through pressure gage. c. Close test valve and confirm test oil pressure turns to zero. d. Reset handle manually to place test handle at the normal position. 3.6.2.9 3.6.2. 9

Vacuum leakage test

(1) Confirm standby vacuum pump is in the startup state at any time. (2) Record load, vacuum, steam extraction temperature and atmospheric pressure before test. (3) Shut down running of vacuum pump manually and pay attention to vacuum change condition. (4) Begin to record vacuum values of low pressure, high pressure condenser once a minute after 30s. (5) Regain vacuum pump running after shutting down vacuum pump 8min. (6) Solve average value of vacuum breaking per minute from the breaking value of vacuum of the last 5min. (7) Vacuum Vacuum tightness criteria is breaking per minute is not greater than 0.399KPa. Vacuum tightness evaluation criteria are as follows: Superior: 0.133kPa/min (1mmHg/min); Good: 0.266kPa/min (2mmHg/min); Qualified: 0.399kPa/min (3mmHg/min). (8) Vacuum of any condenser shall not be less than 90KPa during test; stop test immediately if vacuum breaks and recover recover to the state before test. 3.6.2.10

Sealing oil standby oil pump self-starting and standby oil source test

(1) Sealing oil system runs normally. normally. (2) AC lubrication pump and hydrogen sealing standby oil pump control switches are at automatic Steam Turbine Operation Manual Page 84 of 197


position. (3) Start up AC lubrication pump and hydrogen sealing standby oil pump self-starting #1 test station oil drainage valve slowly on site, observe pressure gage reading and record starting pressure values of AC lubrication pump and hydrogen sealing standby oil pump. (4) Close AC lubrication pump and hydrogen sealing standby oil pump #1 test station oil drainage valve. (5) Place AC lubrication pump and hydrogen sealing standby oil pump after shutdown at automatic position after observing pressure pressure is normal. (6) Repeat the above operation to carry out AC lubrication pump and hydrogen sealing standby oil pump #2 test station test. (7) Take record. (8) After sealing oil system runs normally, open oil and hydrogen differential pressure switch air side pressure gage secondary secondary valve to confirm confirm oil and hydrogen differential differential pressure is 0.084MPa. (9) Close differential pressure switch air side sealing oil separating valve, open pressure release valve, and air side DC sealing oil pump is self-starting when oil and hydrogen differential pressure reduces to 0.035MPa. (10) Record starting oil pressure and close pressure release valve. (11) Close differential pressure switch air side pressure gage secondary valve and open its sealing oil separating valve. (12) Stop it after confirming air side DC oil pump runs normally on site, and put automatic standby into operation. 3.6.2.11

EH oil pump test

3.6.2.12

Inspect whether EH oil system runs normally and place standby oil pump switch at “standby”

position. 3.6.2.13

Press “on” button after pressing “EH oil pump test electromagnet” on the DCS picture and inspect

whether solenoid valve is open. 3.6.2.14

Observe EH oil pressure decrease decrease condition, start start up standby oil pump when EH oil pressure

decreases to 11.0~11.4Mpa, record self-starting oil pressure, confirm oil pump runs normally and EH oil pressure recovers. recovers. 3.6.2.15

Press “off” button after pressing “EH oil pump test electromagnet” on t he DCS picture and inspect

whether solenoid valve is closed. 3.6.2.16

Shut down the originally run EH oil pump and then do another standby EH oil pump test again.

3.6.2.17

Overspeed test

(1) Test provisions and precautions a. Carry out overspeed test after unit overhaul or running half a year continuously or maintenance of Steam Turbine Operation Manual Page 85 of 197


emergency governor alone. b. Overspeed test during unit cold start shall be carried out when unit is 10% of rated load and runs at least 7h. c. This test must be directed by General Engineer. Engineer. d. This test must be performed after high pressure and intermediate pressure main steam valve, speed regulating steam valve leakage test, oil injection test, manual releasing test and actions are normal. e. During test, manual tripping handle must be always responsible by special person and apply manual brake timely if necessary necessary.. f. Carry out test when unit with no-load, carry out two mechanical overspeed tripping tests, and rotating speed difference of two overspeed tests shall not be greater than 18r/min. Monitor changes of unit rotating speed, vibration, axial displacement and LP steam extraction temperature closely during test. g. Equip with sufficient testers, instruments and tools before test. (2) Manual releasing test a. Confirm DEH is at “automatic” mode and unit and unit rotating speed is 3000r/min. b. DEH-DCS DEH-DCS picture is at “control overall” picture. c. On-site manual tripping. d. Inspect whether high and intermediate pressure main steam valves and regulating valves, extraction steam check valves are closed on site. e. Reset released handle on site or by main control, and raise speed of unit to 3000r/min. (3) Mechanical overspeed test a. Inspect steam turbine rotating speed is 3000r/min and whether parameters are normal. b. Place the test switch switch at “overspeed restrain” restrain” position on the program control EPS picture. picture. c. Put “103 prohibit” function into operation on the DEH-DCS DEH-DCS picture. d. Target Target rotating speed is 3300r/min and raising speed is 50r/min. e. Steam turbine rotating speed raises to emergency governor operate value, emergency governor operates, steam turbine trips, and main steam valve and regulating valve are closed. f. Carry out emergency shutdown immediately manually if steam turbine rotation raises to emergency governor operate value but emergency governor doesn’t do esn’t operate. g. Emergency governor resets and unit resets again when unit rotating speed decreases to 3000r/min. h. Perform emergency governor overspeed releasing test twice under the same condition and rotating speed difference of the two operates shall not exceed 18r/min. (4) Electrical overspeed test a. Inspect steam turbine rotating speed is 3000r/min and whether parameters are normal. b. Place the test switch switch at “overspeed protection” protection” position on the program program control EPS picture. picture. Steam Turbine Operation Manual Page 86 of 197


c. Set the target rotating speed is 3310r/min and raising s peed is 50r/min. d. Electrical overspeed protection action steam turbine trips when steam turbine rotating speed raises to 3300r/min; inspect high and intermediate pressure main steam valve and close regulating valve rapidly. e. Unit can reset when unit rotating speed decreases below 3000r/min. 3.6.2.18

Small turbine static test

(1) Confirm whether small turbine t urbine HP/LP steam sources have separated thoroughly before test. (2) Put EH oil system into operation and its operation is normal. (3) Start up small turbine AC oil pump and inspect whether control, lubrication oil pressure and oil temperature are normal. (4) Press “small turbine reset” button on the MEH control panel to reset tripping alarm. Inspect and confirm whether small turbine has no tripping command. (5) Press “latch” button. (6) Press “HP main steam valve” button, open HP main steam valve; press “LP main steam valve”, open LP main steam valve, and inspect and confirm on site all have been open. (7) Press control button of LP regulating valve again, input 100%, all the LP regulating valves open, and press control button of HP regulating valve. valve. (8) Input 100%, all the HP regulating valves open, valve position indication on the control panel is 100%, and inspect and confirm on site all have been open. (9) Press “apply the brake” button, all HP/LP main valves and regulating valves are closed, tripping light is on and reset light is off. Inspect and confirm on site all have been closed. (10) Take Take record when test is over. over. Recover the system to its original state. 3.6.2.19

Small turbine main steam valve activity test

Carry out main steam valve activity test when small turbine rotating speed is 4300r/min. Perform tests for small turbine HP/LP main steam valves respectively once a week. (1) LP main steam valve activity test (25% excursion test) a. Select “LP main steam valve activity test” on the DCS picture. b. Press LP main main steam valve “put test into operation” button, button, test solenoid valve 6YV energizes, energizes, inspect whether main steam valve on site closes slowly according to certain rate and stops until 25% position. c. LP main steam valve test in-place signal sends out, test solenoid valve 6YV is power losing, and LP main steam valve opens fully automatically. automatically. d. During test process, pay attention to whether switch position DCS of main steam valve is corresponding to on-site indication. e. Test is over when DCS indicates “successful”; perform test after finding out causes and finishing treatment if DCS indicates “failed”. Steam Turbine Operation Manual Page 87 of 197


(2) HP main steam valve activity test (total excursion test) HP main steam valve activity test shall be carried out when small turbine rotating speed is faster than 3100r/min and in “automatic” state. a. Select “HP main steam valve activity test” on the DCS picture. b. Close small turbine HP regulating valve during test. c. Press HP main steam valve test “put test into operation” button, main steam valve activity test solenoid valve 8YV energizes, and HP main steam valve fully opens gradually. gradually. d. After MEH receives fully closed signal of main steam valve, main steam valve activity test solenoid valve 8YV is power losing, and HP main steam valve opens fully automatically. automatically. e. Pay attention to whether switch position DCS of main steam valve is corresponding to on-site indication during test. f. Test is over when DCS indicates “successful”; perform test after finding out causes and finishing treatment if DCS indicates “failed”. 3.6.2.20

Small turbine overspeed test

Before test, split small turbine and feed pump coupling and test small turbine alone; perform small turbine manual releasing test before this test, inspect whether main steam valve and regulating valve close rapidly, rapidly, or prohibit performing overspeed test. (1) Electrical overspeed test a. Raise rotating speed of small turbine to normal working rotating speed according to normal raising speed procedure of small turbine. Press “overspeed key test switch” button on the MEH -DCS and place it at “normal”. b. Contact with thermotechnical thermotechnical personnel to set electrical electrical overspeed protective protective value as as 5900r/min. c. Set target rotating speed as 6000r/min. d. Press “proceed/maintain” button and state shows “proceed”. e. Electrical overspeed protection operates when small turbine raises speed to 5900r/min, and small turbine trips. f. Close HP main steam valve, LP main steam valve and LP regulating valve automatically and rotating speed shall decrease. g. After test is over, contact with thermotechnical personnel to set overspeed protective value as 6000r/min. h. Place “overspeed key test switch” button at “normal” position after test is over. over. (2) Mechanical overspeed test a. Raise rotating speed of small turbine to normal working rotating speed according to normal raising speed procedure of small turbine. Press “overspeed key test switch” button on the MEH-DCS and place it at Steam Turbine Operation Manual Page 88 of 197


“mechanical overspeed”. b. Contact with thermotechnical personnel to relieve small turbine MEH and TSI oil gas overspeed protection. c. Set target rotating speed as 6400r/min and speed raising rate is 300r/min. d. Press “proceed/ maintain” button and state shows “proceed”. e. Mechanical overspeed protection operates when small turbine raises speed to 6425r/min, and small steam engine trips. f. Place “mechanical overspeed test” button at “normal” position after test is over. over. g. After test is over, contact with thermotechnical personnel to put small turbine MEH and TSI electrical overspeed into operation. 3.6.2.21

Small turbine emergency governor oil injection test

(1) Raise small turbine rotating speed to 3500-3550r/min according to normal startup procedure; (2) Keep steam parameter is rated value 0.72MPa/346 ℃ and inspect whether parameters of bearing vibration, oil temperature, oil pressure and vacuum are normal; (3) Press “oil injection test” button on the small turbine MEH picture, pop out “oil injection test” operation window and press “put into operation” button; (4) Close separating solenoid valve excitation, open oil injection solenoid valve excitation when “latch” signal turns gray, “latch oil pressure doesn’t establish” signal and “primary oil pressure is low” signal occurs. (5) Carry out latch on site after oil injection test is successful. “Latch” signal occurs and “latch oil pressure doesn’t doesn’t establish” and “primary “primary oil pressure is low” signals disappear. disappear. (6) Press “switch off” button off” button and test is over. over. (7) Contact with thermo-technical personnel timely for treatment if separating solenoid valve or oil injection solenoid valve operates abnormally, abnormally, oil injection test is not successful or small turbine trips. 3.6.2.22 3.6.2. 22

Water pump linkage test

Carry out static test first for 6KV equipment and 400V great power equipment. Static test includes static switching in, on-site accident button and linkage test. Perform dynamic test only after passing static test. Dynamic test includes motor running in and equipment running in. (1) Electrical static linkage test (6KV equipment and 400V equipment) a. Swing test pump electrical switch to “test” position and connect with operation power source. b. Click “startup” button on the DCS and inspect whether this startup state of this pump feedbacks normally. c. Put standby interlock into operation. d. Press accident button of running pump on site, this pump state displays shutdown and standby pump is linkage. Steam Turbine Operation Manual Page 89 of 197


e. Test Test another pump by the same method. f. Recover the state before test after test is over. (2) Electrical dynamic linkage test (400V equipment) a. Connect with power source and operation power source of this equipment. b. Start up a pump to to run and put interlock of standby pump into operation. operation. c. Press accident button of running pump on site, this pump state displays shutdown and standby pump is linkage. d. Test another pump by the same method. e. Shut down pump after test is over. over.



4.

Unit accident disposal

4.1

Accident disposal principle

4.1.1

Watchman shall lead the staff of unit quickly to handle accident according according to provisions of rules rules under

the direct leadership of Shift Supervisor when occurring accident. Immediately execute command from Shift Supervisor except the command has direct danger on human body and equipment, or state reasons and object to execute it. Report it to the superior when Shift Supervisor insists on the dangerous command. 4.1.2

Operators shall shall find out accident accident first causes quickly when when occurring accident, accident, to eliminate eliminate threat on

human body and equipment and ensure normal running of non-fault equipment as far as possible at the same time. Emergency shutdown shall ensure the plant electricity is not power losing. 4.1.3 4.1.3.1

Operators shall shall handle accident accident according according to the the following procedure when unit occurs fault. fault. Determine unit has occurred occurred fault according according to parameter parameter change, DCS display, display, equipment linkage,

screen alarm, light word plate alarm, fault printing and outside unit phenomenon condition, then: (1) Eliminate threat on human body and equipment rapidly and split equipment that occurs fault immediately if necessary; (2) Find out fault nature, occurred location and scope rapidly, then handle it and report it; (3) Maintain normal running of non-fault equipment; (4) Each stage of accident disposal shall report it to Shift Supervisor as fast as possible, convenient for timely report and adjustment, correctly adopting countermeasure and preventing accident expansion . 4.1.3.2

Take measures and maintain unit running when it’s judged to be system and other equ ipment fault,

convenient for possibly recover normal running of the whole unit as soon as possible. 4.1.3.3

Each post shall shall notify each each other about the condition when handling accident, accident, cooperate cooperate each other

closely, handle it according to provisions of rules quickly and strive to prevent accident expansion under unified command of Shift Supervisor. 4.1.3.4

Accident disposal shall shall be rapid and accurate. Repeat it again after receiving receiving command and report

execution condition rapidly to commander after executing command. 4.1.4

When occurring accident and fault outside this rule, Watchman Watchman shall make correct correct judgment according according

to his own experience, take countermeasures actively and handle it quickly. Ask for instruction from Shift Supervisor if time permits and carry out accident handling under the guide of Shift Supervisor. Supervisor. 4.1.5

Immediately

carry out manual manual MFT or apply apply the brake brake manually manually during accident accident disposal disposal when when

reaching emergency furnace shutdown and turbine shutdown condition but protection doesn’t act; immediately shut down this auxiliary turbine when auxiliary turbine reaches emergency shutdown condition but protection doesn’t doesn’t act. 4.1.6

If occurring occurring unit sudden tripping, recover unit running as soon as possible after finishing accident

disposal and accident causes have been found out. Steam Turbine Operation Manual Page 91 of 197


4.1.7

When unit occurring fault fault and handling accident, accident, Operators Operators shall not leave work work without authorization. authorization.

Extend shift handover if accident occurs at the shift handover time. Before handling handover procedure, handing personnel shall continue to work until finishing accident handling or coming an conclusion. Handled personnel shall actively actively assist handling personnel to to handle accident. 4.1.8

Prohibit irrelevant irrelevant personnel gathering gathering in the central control room or staying staying at the fault fault locality

during accident handling process. 4.1.9

After finishing handling, handling, Watchmen Watchmen shall immediately report report the accident occurrence occurrence and handling handling

condition to the superior and take detailed record for accident time, phenomenon, development, handling process and cause analysis. analysis. After After shift meeting organizes organizes all the staff staff to analyze accident accident and write report. 4.2

Emergency shutdown and accidental accidental shutdown condition and disposal disposal

4.2.1

Break vacuum vacuum and perform emergency shutdown when encountering one of the situations:

4.2.1.1

Unit rotating s peed raises to 3300rpm but overspeed protection protection doesn’t operate. operate.

4.2.1.2

Unit suddenly occurs occurs violent vibration vibration or blade of steam turbine breaks and accompanies accompanies with

obvious metal grating and impact sound. 4.2.1.3

Steam turbine occurs water impact.

4.2.1.4

Any bearing of steam turbine unit smokes due to fuel cutoff cutoff or any support bearing bearing metal

temperature of steam turbine reaches 113 ℃ or generator support bearing metal bearing temperature reaches 120℃ or its oil return temperature reaches 82℃. 4.2.1.5

Steam turbine oil system and generator sealing oil system catches fire and can’t be extinguished,

and threaten human body and equipment safety. safety. 4.2.1.6

Sealing oil system loses oil and hydrogen differential differential pressure and and generator sealing pad leaks a

large amount of hydrogen. 4.2.1.7

Oil system leaks leaks a large large amount of oil, main oil tank level decreases decreases to extremely extremely low value of main

oil tank level, gives an alarm but can’t be remedied. 4.2.1.8

Steam turbine axial displacement reaches to tripping valve, but overspeed protection doesn’t

operate. 4.2.1.9

Any differential differential expansion expansion of steam turbine high, intermediate intermediate and low pressure cylinder exceeds exceeds

limit value. 4.2.1.10

Lubrication pressure reduces to 0.049 MPa (tripping value), but protection doesn’t operate.

4.2.1.11

Generator smokes, catches fire or hydrogen explodes.

4.2.1.12

Oil return return temperature temperature of steam steam turbine turbine thrust bearing reaches reaches 80 ℃.

4.2.1.13

Steam turbine shaft shaft seal seal is abnormal friction and sparkles. sparkles.

4.2.2

Report to Shift Supervisor immediately immediately and carry carry out non-breaking non-breaking of vacuum fault shutdown after

approval if encountering one of the following situations: Steam Turbine Operation Manual Page 92 of 197


4.2.2.1

Main steam temperature temperature and reheating reheating steam temperature run run in excess of 20min or above above 565℃

after raising to 554 ℃. 4.2.2.2

Upper and lower lower cylinder temperature temperature difference difference of steam turbine high and intermediate intermediate pressure

cylinder exceeds 56 ℃. 4.2.2.3

Pressure in front of steam turbine automatic automatic main steam valve valve exceeds 18.9MPa.

4.2.2.4

Condenser vacuum decreases, it can’t be recovered and continue to decrease to 79.7kPa after load

reduces to the minimum. 4.2.2.5

Generator fixed cold water flow is lower than 104T/H which can’t be recovered, and water -break water -break

protection protection doesn’t operate. 4.2.2.6

DEH work abnormity can’t control steam turbine rotating speed and load.

4.2.2.7

EH oil pump or EH oil system fault endanger unit safety or EH oil pressure is lower than than 9.5MPa.

4.2.2.8

LP cylinder steam extraction temperature temperature is high to 121℃.

4.2.2.9

Generator sealing oil system fault can’t maintain necessary oil pressure and oil level.

4.2.2.10

Main and reheat reheat steam pipe, HP water supply pipe or pressure-containing pressure-containing member member breaks and unit

can’t be operated. 4.2.2.11

High and intermediate pressure regulating steam steam valve control loop is seriously fault and can’t

maintain normal operation of unit. 4.2.2.12

Plant power sources are all lost.

4.2.2.13

Oil temperature temperature after oil cooler is high to 60℃ and it’s invalid after adjustment.

4.2.2.14

All the operator stations of heat control control DCS system are fault (all the DCSs are “blank screen” or

“dead halt”), and there is no reliable standby operation and monitor means. 4.2.2.15

Steam temperature in front of steam turbine high and intermediate intermediate main steam valve abnormally abnormally

decreases below 450 ℃ or reheat steam temperature decreases 50 ℃ in 10min during unit is operated. 4.2.2.16

Unit runs more than 1min without steam.

4.2.2.17

All the rotating speed speed meters of steam turbine display incorrectly or without display, display, and there is

no any monitor means. 4.2.2.18

Reheat steam is interrupted.

4.2.2.19

Control steam pressure is low or disappeared disappeared unit cannot maintain maintain the original running mode.

4.2.2.20

Recovery of protective controller fault is failure.

4.2.2.21

High and intermediate main steam valve speed regulating steam valve is jamming and can’t move.

4.2.2.22

Hydrogen content at the steam steam turbine hydrogen hydrogen separation separation and anti-explosion fan exhaust port port or

in the main oil tank exceeds 1%. 4.2.2.23

Any of the protection shall trip but not trip (in addition to shutdown due due to breaking breaking of vacuum).

4.2.2.24

Pressure ratio of regulating regulating stage and and HP steam extraction extraction is less less than 1.7. Steam Turbine Operation Manual Page 93 of 197


4.2.3 4.2.3.1

Emergency shutdown operation operation procedure procedure of breaking breaking of vacuum vacuum Press “emergency shutdown” button manually or pull steam turbine tripping handle manually in the

central control room, to confirm generator splits and steam turbine rotating speed decreases; inspect and confirm whether high and intermediate pressure main steam valve, regulating valve, HP extraction check valve and each stage steam extraction check valves are closed. 4.2.3.2

Inspect whether whether steam turbine turbine main body and main reheat reheat steam pipe and steam steam extraction pipe

drain valve are open, plant electricity switches successfully, boiler interlocks MFT, and primary fan, coal pulverizing system and fuel system in front of boiler boiler has shut down. 4.2.3.3

Start up main engine lubrication lubrication pump and DC lubrication pump manually manually,, inspect whether

lubrication pressure is normal and adjust lubrication temperature to be normal. 4.2.3.4

Shut down vacuum vacuum pump. Close to condenser condenser all dewatering, dewatering, open breaking breaking valve of vacuum

(handle this

in light of the circumstances for fault shutdown).

4.2.3.5

Stop shaft seal steam if vacuum is 0.

4.2.3.6

Inspect whether whether barring automatic automatic operation is normal normal if rotating speed speed is 0; perform manual

operation if automatic operation is not successful and record rotor idling time, eccentricity, barring motor current and cylinder temperature, etc. 4.2.3.7

Pay attention to whether unit’s vibration, lubrication temperature and sealing oil and hydrogen

differential differential pressure are normal during shutdown. 4.2.3.8

Operators shall shall listen attentively attentively to interior sound of unit on site and prohibit immediately start up

unit again if there is obvious metal impact sound or rotor idling time shortens obviously in the interior. 4.2.3.9 4.2.4 4.2.4.1

Other operations are the same with normal shutdown. Operation procedure of not not breaking breaking of vacuum fault shutdown shutdown Report to Shift Supervisor Supervisor for application application of shutdown, reduce reduce load rapidly rapidly after receiving receiving fault

shutdown command, start up AC lubrication pump and jacking oil pump and barring motor running and confirm lubrication pressure is normal. 4.2.4.2

Press “shutdown” button on the steam turbine control panel or apply the brake at the turbine head,

inspect whether load is to zero, generator reverse-power protective operates, generator splits, steam turbine rotating speed decreases, high and intermediate automatic main steam valve, regulating valve, steam extraction electric valves, check valve and HP extraction check valves are closed. 4.2.4.3

Inspect whether whether open drain drain valves of main main and reheat steam pipe automatically automatically,, and open steam

turbine main body drain valve. 4.2.4.4

Inspect whether HP/LP HP/LP bypass actions are are normal, attemperation water water puts into operation

automatically, automatically, open condenser rear cylinder water injection valve interlock, and condenser vacuum and steam cylinder steam extraction temperatures are normal. Steam Turbine Operation Manual Page 94 of 197


4.2.4.5

Confirm shaft seal steam supply pressure pressure and shaft seal seal temperature temperature are normal and deaerator

switching is normal. 4.2.4.6

Perform comprehensive comprehensive inspection for steam turbine turbine main body, body, emphasis on unit vibration, axial

displacement, differential differential expansion, thrust pad temperature bearing oil return temperature as well as relevant parameters related related to protective action, action, and listen attentively to sound of each unit part. 4.2.4.7

Inspect whether whether barring device device automatic operation runs normally normally when rotation rotation is 0, and record record

barring current, rotor eccentricity ratio ratio and rotor idling time. 4.2.4.8 4.3

Complete other operations of shutdown.

Steam parameter abnormity

4.3.1

Phenomena

4.3.1.1

Every main main and reheat reheat steam pressure and temperature are too high or too too low. low.

4.3.1.2

Parameter overruns and gives an alarm.

4.3.1.3

Unit load changes.

4.3.1.4

Main engine engine axial axial displacement displacement and differential differential expansion have have variation. variation.

4.3.2

Cause

4.3.2.1

Pressure and temperature temperature control system system have fault or adjustment of attemperation attemperation water is

improper. 4.3.2.2

Unit shed load suddenly. suddenly.

4.3.2.3 4.3.2. 3

HP heater splits suddenly. sudden ly.

4.3.2.4

Safety valve of steam system opens suddenly. suddenly.

4.3.2.5

Coal quality changes suddenly suddenly or coal pulverizing pulverizing system system runs abnormally. abnormally.

4.3.3

Disposal

4.3.3.1

Control system fault shall be handled respectively respectively according according to fault degree, switch to manual mode

to adjust pressure and temperature to be normal if necessary and adjust it through adjusting combustion and load, etc. 4.3.3.2

Handle it as as per relevant relevant provisions if too fast load increase and decrease causes adjustment adjustment of load

change rate and load change caused by working condition like protective action. 4.3.3.3

HP heater protective action splitting shall adjust unit load timely. timely.

4.3.3.4

If coal pulverizing system runs abnormally and uneven coal powder output output cause unstable unstable boiler

heat load, adjust coal pulverizing system and shut down the system if necessary. necessary. 4.3.3.5

Handle it according according to the following following provisions when main and reheat reheat steam temperatures temperatures are

abnormal: (1) Allow unit carries out long-term continuous operation when main and reheat steam temperature changes within 538 5388℃. Steam Turbine Operation Manual Page 95 of 197


4.3.3.6

When steam temperature raises to 545~551℃ abnormally, the running time shall not exceed 400h in

total within a year and running time of each time shall not exceed 30min, or carry out fault shutdown. Carry out fault shutdown when overtemperature if exceeding 400h. 4.3.3.7

Allow main and reheat steam temperature temperature fluctuates fluctuates to maximum maximum 565℃ from rated temperature

within 15min, or runs within 551~565℃ temperature, yearly accumulative total shall not exceed 80h, or immediately carry out fault shutdown if exceeding the time period. Immediately carry out fault shutdown if steam temperature is higher than 565 ℃. Contact with boiler operator and carry out timely adjustment to prevent overheating overheating if main and reheat steam steam temperature temperature is always high. 4.3.3.8

Rapidly take measures to recover steam steam temperature temperature to normal normal value when when main steam temperature temperature

and reheat steam temperature are abnormal. Immediately carry out fault shutdown if main steam and reheat steam temperature continues to decrease below rated value 84 ℃ (454℃) or steam temperature suddenly decreases exceeding 50 ℃ during handling process. (2) When steam pressure and temperature change abnormally, abnormally, pay attention to monitoring trend of steam turbine differential expansion, axial displacement, shaft vibration, section pressure and each control index, and immediately carry out fault shutdown if exceeding limit value. 4.4

Unit load hunting

4.4.1

Cause

4.4.1.1

System impact, oscillation or boiler running is normal;

4.4.1.2

Generator is out of step;

4.4.1.3

Steam turbine control system is abnormal or speed regulating steam valve action is abnormal; abnormal;

4.4.1.4

HP/LP bypass is operated by mistake or reheating steam steam extraction extraction shuts down suddenly. suddenly.

4.4.2 4.4.2.1

Disposal Relieve CCS coordinative coordinative control and find out causes causes quickly according to DCS display, display, relevant

instruments’ instruments’ indications and external symbol. 4.4.2.2

Rapidly execute execute relevant operations according according to command command from from Shift Supervisor Supervisor if system occurs occurs

oscillation. 4.4.2.3

Generator out of step shall reduce generator active power power and increase increase excitation excitation manually manually..

4.4.2.4

Strictly control control unit output and don’t exceed output running if unit load changes suddenly due to

power grid cycle cycle change. 4.4.2.5

Immediately switch to manual control if caused caused by control system abnormity abnormity,, and carry out

shutdown handling if it can’t be handled during running; runn ing; 4.4.2.6

Adjust steam turbine steam inflow and stabilize stabilize steam parameters if load sudden change change caused by

abnormal change of boiler running; 4.4.2.7

Increase load according according to allowable allowable steam inflow when speed regulating regulating steam valve is fault falling



out and don’t increase or decrease load forcedly when speed regulating steam valve is jamming. 4.4.2.8

Inspect whether whether oil extraction extraction temperature, temperature, axial displacement, differential differential expansion expansion and vibration vibration

of thrust bearing and other bearings are normal; 4.4.2.9 4.5

Inspect whether whether water levels levels of deaerator, deaerator, condenser condenser,, heater and shaft seal heater are normal.

Unit load shedding

4.5.1

Phenomena

4.5.1.1

Unit load decreases suddenly suddenly,, on-site sound changes suddenly and axial displacement changes; changes;

4.5.1.2

Steam pressure increases increases and boiler safety valve (or PCV valve) valve) operates operates possibly;

4.5.1.3

Steam extraction pressure of each each section decreases;

4.5.1.4

Boiler side has relevant interlock action when occurring “RUN BACK” working condition.

4.5.2

Cause

4.5.2.1

Electric system occurs fault fault and power power transmission transmission line line trips;

4.5.2.2

Unit protection operates;

4.5.2.3

Speed regulating regulating system occurs occurs fault, close regulating valve valve by mistake or main auxiliary engine

trips. 4.5.3

Disposal

4.5.3.1

Closely monitor change of main main and re-steam re-steam parameters parameters and boiler maintains normal parameters as

far as possible. 4.5.3.2

Inspect unit running condition comprehensively, comprehensively, find out causes and handle it correspondingly as far

as possible; immediately report to Shift Supervisor and prepare for raising load if there is no obvious fault. 4.5.3.3

Carry out shutdown shutdown handling handling if it it is speed speed regulating system fault and it can’t be handled during

running. 4.5.3.4

Inspect steam steam pump running situation and water supply automatic automatic regulation regulation situation. Relieve Relieve main

water supply and small turbine automation if water supply automatic regulation can’t meet boiler requirements, and pay attention to minimum flow valve operation condition of feed pump. 4.5.3.5

Pay attention to electricity electricity use running condition; condition; pay attention to condenser condenser vacuum and LP

cylinder steam extraction temperature; monitor and regulate condenser, deaerator and heater water level; maintain normal auxiliary steam protopipe pressure. 4.5.3.6

Pay attention attention to deaerator pressure and shaft shaft seal steam supply condition.

4.5.3.7

Immediately report to Shift Supervisor and immediately execute execute command command from Shift Supervisor if if

unit protection is operated by mistake. 4.6

Breaking of condenser vacuum

4.6.1 4.6.1.1

Phenomena DCS and on-site condenser vacuum indications decrease. Steam Turbine Operation Manual Page 97 of 197


4.6.1.2

Steam extraction temperature temperature raises and and condensation condensation water water temperature temperature raises. raises.

4.6.1.3

Steam flow increases increases and regulating regulating stage pressure raises raises under the same load of unit.

4.6.1.4

Give an alarm when when vacuum breaks to 79.7kPa 79.7kPa or steam extraction extraction temperature temperature raises to 80 ℃.

4.6.2 4.6.2.1

Cause Circulating water water pump works abnormally abnormally or trips, circulating pump outlet butterfly valve opening

reduces or closes totally, and condenser circulating inlet and outlet valves are closely by mistake to cause circulating water volume reduced or suspended. 4.6.2.2

Condenser stainless steel tube is dirt.

4.6.2.3

Vacuum pump pump works abnormally abnormally or trips; vacuum vacuum pump cooling device is fault fault or heat exchange exchange is

dirt. 4.6.2.4

Open vacuum breaking valve by mistake or don’t close it tightly, vacuum system pipe and other

equipment system damages or leaks and vacuum system valve water seal loses. 4.6.2.5

Shaft seal steam steam supply pressure obviously reduces and shaft heater water level and negative

pressure is abnormal. abnormal. 4.6.2.6

Condenser hot well water level is too high.

4.6.2.7

Small turbine vacuum system leaks.

4.6.2.8

Steam engine LP cylinder anti-explosion valve cracks.

4.6.3 4.6.3.1

Disposal Check indications of vacuum vacuum meters rapidly rapidly,, compare steam extraction extraction rise in temperature temperature and

determine breaking of vacuum if finding condenser’s breaking of vacuum. 4.6.3.2

Carry out the following inspections for for circulating circulating water system:

(1) Inspect whether circulating water pressure is normal, and inspect whether circulating water system leaks or is blocked if pressure is low; (2) Inspect whether water level of absorbing well is normal, and clean inlet filter screen timely if water level is low. (3) Inspect whether circulating water temperature rises; (4) Pipe is dirt if condenser intake pressure rises and outlet water temperature rises, and clean condenser at this time; (5) Inspect whether circulating pump runs normally, normally, or start s tart up standby pump. 4.6.3.3

Perform the following inspection for vacuum system and do corresponding separation handling: handling:

(1) Inspect whether vacuum pump and vacuum pump cooling device works normally; (2) Inspect whether vacuum system has leakage point; (3) Inspect whether vacuum system pipe and LP blow-off line are damaged; (4) Inspect whether vacuum breaking valve is tightly closed and seal water is normal; Steam Turbine Operation Manual Page 98 of 197


(5) Inspect whether shaft seal steam supply pressure is normal; inspect whether shaft seal inlet valve and overflow valve are normal, whether shaft heat U type pipe water seal is normal, and start up standby fan if shaft heater fan is fault or shaft heater negative pressure is low; (6) Inspect whether small turbine exhaust steam system is normal, if necessary, start up electric pump, shut down small turbine and close exhaust steam butterfly valve. 4.6.3.4

Inspect whether condensate pump pump seal water is normal and barring barring root is completely completely leakage;

whether condenser water level is too high, and carry out shutdown or leakage inspection treatment according to stainless steel tube leakage conditions if condensate hardness and electrical conductivity rise. 4.6.3.5

Breaking of vacuum of condenser to 75kPa, standby vacuum pump starts up automatically automatically,, or puts it

into operation manually; reduce load if vacuum continues to break. Jumping engine protection acts if vacuum breaks to 69.3Kpa. Otherwise, Otherwise, apply the brake brake manually for shutdown. 4.6.3.6

During breaking of vacuum, pay close attention to LP LP cylinder exhaust steam temperature. temperature. LP

cylinder water spray begins operation when exhaust temperature rises to 70 ℃; fully open spray water valve when temperature is 80℃; shut down engine as fault if temperature continues rising to 120 ℃. 4.6.3.7 4.7

Small turbine trips when vacuum breaks breaks to 47.46kPa, 47.46kPa, or carry out manual shutdown.

Large unit vibration

4.7.1

Phenomena

4.7.1.1

Shaft vibration indications of the TSI are large, and so are the in situ measurement measurement values.

4.7.1.2

The bearing vibrates obviously obviously when feeling with hands, and the unit sound is abnormal.

4.7.1.3

The bearing temperature increases.

4.7.2

Cause

4.7.2.1

The pressure and temperature temperature of the lubrication oil are abnormal or oil whip occurs

4.7.2.2

Unit warm-up is insufficient, insufficient, the cylinder expends expends and the cylinder cylinder draining is poor, poor, and the

temperature differences between upper cylinder and lower cylinder in the HP cylinder and IP cylinder are large. 4.7.2.3

Large shaft bending

4.7.2.4

The operation operation parameter and work condition rapidly change resulting in abnormal changes of axial

thrust. 4.7.2.5

Broken blades blades or internal internal machine machine parts of the turbine turbine break down or drop off. off.

4.7.2.6

The bearings of the main engine break down.

4.7.2.7

Cold air or cold water inflow or water impact occur occur on the turbine.

4.7.2.8

Breaking of vacuum causes causes turbine shaft centerline centerline offset offset or last last stage blade blade vibration.

4.7.2.9

The unit speed are within the critical speed speed range during power-on power-on and power down. down.

4.7.2.10

Unit vibration vibration caused by the generator faults, such such as magnetic field imbalance imbalance Steam Turbine Operation Manual Page 99 of 197


4.7.3

Disposal

4.7.3.1

The unit will will shut down when the unit vibration vibration increases to the value requiring requiring protection actions. actions.

Otherwise, shut down the unit manually. manually. 4.7.3.2

Check whether the pressure and temperature temperature of the lubrication, lubrication, bearing metal metal temperature temperature and oil

return temperature are normal. If not, adjustment is required. 4.7.3.3

If vibration is caused by water water impact, isolate the cold air and cold water sources sources and the improve improve

the water draining in the block. 4.7.3.4 4.8

If vibration is caused by the generator, generator, decrease the unit load and and then monitor the unit operation.

Steam turbine water impact

4.8.1

Phenomena

4.8.1.1

The main and reheat steam temperatures rapidly decreases decreases and give give an alarm. alarm.

4.8.1.2

The temperature temperature difference difference between between the upper and lower cylinders of the steam turbine is large, and

give an alarm. 4.8.1.3

Water slamming occurs occurs in the steam turbine or the steam steam pipeline, and the vibration of the unit and

steam pipeline is intensified. 4.8.1.4

The load fluctuation and differential differential expansion decrease, decrease, and the axial displacement displacement and the

temperature of the thrust bearing increase. Steam leaks or water drops slop on the steam pipeline flange, valve rod, cylinder joint face and shaft seal. 4.8.1.5 4.8.2 4.8.2.1

Barring current increases in barring mode. Cause The vapor bag is filled with water water and steam flow flow rapidly increases increases to a large quantity so that the

priming occurs. 4.8.2.2

Boiler combustion control is improper or fails.

4.8.2.3

The desuperheating desuperheating water water control of the boiler boiler main and reheat steam is improper or fails.

4.8.2.4

During unit power-on, the draining of the warming pine is not complete complete or smooth.

4.8.2.5

Water spills from the heater and deaerator, deaerator, and flows flows to the steam turbine. turbine.

4.8.2.6

The draining of the shaft seal seal system is not proper so that the accumulated accumulated water water and drained drained water

flows to the cylinder. 4.8.2.7 4.8.3 4.8.3.1

The indication of the main main or reheat temperatures is abnormal. abnormal. Disposal When the temperatures temperatures of main and reheat reheat steam decrease decrease abnormally abnormally,, immediately check check related

meters to confirm that the temperature actually decreases. 4.8.3.2

After confirming confirming that the water water impact occur occur on the unit, immediately perform perform the vacuum break

emergency shutdown. Steam Turbine Operation Manual Page 100 of 197


4.8.3.3

If the temperatures of the main and reheat steam rapidly decrease decrease below the set value, immediately immediately

perform the vacuum vacuum break emergency emergency shutdown. 4.8.3.4

When the temperatures temperatures of the the main and reheat reheat steam decrease decrease abnormally abnormally,, strengthen the monitor

on the metal temperature and temperature difference of the steam turbine upper and lower cylinders. If the temperature of the lower cylinder is 42°C lower than that of the upper cylinder, all steam traps of the steam turbine block and the main and reheat steam pipelines should be opened. 4.8.3.5

Check the turbine turbine block and and the opening conditions of all the steam pipeline traps to completely

drain the water. 4.8.3.6

Verify and eliminate the causes for water impact and isolate the faulty devices. devices.

4.8.3.7

Correctly record record and analyze analyze the idling time, input continuous continuous barring in a timely manner, manner, measure measure

the shaft bending, and listen to the sound in the unit. If the idling time, shaft thrust, differential expansion, vibration and temperature difference between the upper and lower cylinders are all normal, and no rub occur and unusual sound is heard in the unit, contact the shift supervisor to restart the unit after completely draining the water tint he main and reheat steam pipeline and pump-line. 4.8.3.8

If water impact, differential differential expansion, shaft thrust temperature temperature exceeding the limit, limit, and obvious

idling time shortening occur, or unusual sounds are heard and rub occurs between dynamic and static parts in the unit, open the cylinder for examination. 4.8.3.9

If water flows in the steam turbine barring, keep keep the barring barring in operation till the temperature temperature

difference between the upper and lower cylinders of the steam turbine becomes normal. At the same time, strength the monitor on the sounds inside the steam turbine, rotor eccentricity and barring currency. currency. 4.9

Blade of the turbine drops

4.9.1

Phenomena

4.9.1.1

Metal clash clash generates generates in cylinder or grating generates in set barring;

4.9.1.2

Set vibrates fiercely;

4.9.1.3

Axial displacement displacement and differential differential expansion expansion changes abnormally; thrust thrust pad temperature temperature and oil

return temperature rise; 4.9.1.4

Pressure in monitoring section rises;

4.9.1.5

If the blade blade of low pressure pressure cylinder breaks and the broken bland enters condenser and and damages

stainless steel pipe, the conductivity and hardness of condensation water increase and the water level of hot well rise abnormally; 4.9.2

Disposal

4.9.2.1

If it is determined determined that blade breaks and the set vibrates fiercely fiercely,, please stop operation operation immediately. immediately.

4.9.2.2

If the regulator or extraction pressure pressure is abnormal, abnormal, please immediately analyze and and meanwhile refer

to the change of vibration, axial displacement and metal temperature of thrust bearing to determine that Steam Turbine Operation Manual Page 101 of 197


broken blade shall be given given emergency emergency disposal; 4.9.2.3

If the water water level in condenser condenser rises, turn turn on the water in front of #5 low-add outlet to maintain maintain

normal water level or drain in condensation water storage tank. 4.9.3

Prevention

4.9.3.1

Keep the set operating operating within allowable cycle scope;

4.9.3.2

Keep the set steam parameter normal;

4.9.3.3

Ensure that that heater and deaerator deaerator operate operate in order and and relevant relevant dredge dredge

4.9.3.4

Keep normal set output and forbid overrun;

4.9.3.5

Strictly forbid overrunning of the turbine;

4.9.3.6

Monitor water water quality in case of corrosion corrosion after after blade blade scales. scales.

4.10

Axial displacement displacement of main engine is normal

4.10.1

Phenomena

4.10.1.1

DCS and recorder shows that axial displacement displacement exceeds the limitation;

4.10.1.2

The temperature temperature of thrust bearing bearing and oil return return rises abnormally abnormally high. The set set vibration may

probably enlarge. enlarge. 4.10.1.3 4.10.2

The turbine trips when it comes comes to set protection protection movement value. Cause

4.10.2.1

The set overloads or set load and steam flow flow change suddenly. suddenly.

4.10.2.2

The load is the same, while the steam steam parameter parameter is low or the steam extraction extraction condition changes changes

suddenly. 4.10.2.3

Water induction happens to the turbine.

4.10.2.4

Thrust pad abrades.

4.10.2.5

Blade scales seriously. seriously.

4.10.2.6

Blade breaks.

4.10.2.7 4.10.2 .7

Vacuum degree of condenser is low.

4.10.2.8

The axial abrasion of the set is abnormal. abnormal.

4.10.2.9

Generator rotor bunches.

4.10.2.10

Cycle drops

4.10.2.11

Safety valve of reheater moves.

4.10.3 4.10.3.1

Disposal When axial displacement is abnormal during operation, please immediately immediately examine whether the

thrust pad temperature rises, whether abnormal sound generates in the machine, whether the pressure and temperature of lubricating oil are normal, whether set vibration is normal and whether steam parameter and vacuum degree of condenser are normal, etc. Steam Turbine Operation Manual Page 102 of 197


4.10.3.2

If it is caused due to above abnormal abnormal parameters, please please regulate parameters parameters till they return return

normal. 4.10.3.3

Report to the leader and promptly reduce set load so that axial displacement and and return oil

temperature, thrust bearing temperature recover to normal value. 4.10.3.4

If it is caused caused due to blade blade break or steam turbine water water impact, impact, please break down immediately immediately..

4.10.3.5

When axial displacement rises to limitation and protection does not function, function, please break down

emergently. 4.11

Lubricating oil system fault of main engine

4.11.1

Common faults

4.11.1.1

Lubricating oil pressure reduces

4.11.1.2

Lubricating oil temperature increases extremely high.

4.11.1.3

Oil level of main oil tank drops.

4.11.1.4

Lubricating oil quality is not qualified.

4.11.1.5

Oil pipeline leaks.

4.11.2 4.11.2.1

Lubricating oil pressure drops Phenomena

(1) Lubricating oil pressure drops according to gauges and DCS display; (2) Temperature Temperature and oil return temperature of all bearings may increase or alarm; (3) Lubricating oil pressure drops to 0.0823MPa and alarm; meanwhile alterative-current lubricating oil pump starts. (4) Lubricating oil pressure drops to 0.0755MPa and alarm; meanwhile direct-current lubricating oil pump starts 4.11.2.2

Cause and disposal

(1) When main oil pump or oil ejector works out of order, please start alterative-current lubricating oil pump; if main oil pump works out of order seriously, seriously, please close down disorderly; disorderly; (2) If lubricating oil supply pipe leaks, please adopt measures to stop the leaking and contact repair to dispose; closely monitor the oil level of main oil tank and supplement oil if necessary; (3) When lubricating oil pressure drops to 0.0755Mpaand direct current accident oil pump starts automatically; when lubricating oil pressure continually drops to 0.049Mpa, please close down emergently; emergently; (4) Outlet check valve of ac and dc lubricating oil pump is not strictly closed; report to the on-duty leader and contact repairman to dispose; (5) Please regulate to normal condition when overpressure valve mal-operates; (6) When lubricating oil pressure drops, please examine the bearing black gold and oil return temperature and oil flow of oil-return observation window; Steam Turbine Operation Manual Page 103 of 197


(7) When lubricating oil pressure drops, please pay close attention to bearing temperature and oil return temperature and immediately close down and damage vacuum when supported bearing temperature is abnormally high to limited amount; (8) Please immediately close down when bearing leaks oil; (9) During set starts and accelerates, when the accessory oil pump has fault so that lubricating oil pressure drops, depending upon the revolving speed of the set and fault property, property, please accelerate to rated revolving speed and dispose accessory lubricating oil pump if the revolving speed is close to 2750r min while the fault can be eliminated soon or please close down if the revolving speed is lower than 2750r  2750r min while the accessory lubricating oil pump fault cannot be eliminated soon. 4.11.3 4.11.3.1

Lubricating oil temperature Phenomena

(1) The outlet temperature of oil cooler is high; (2) Bearing temperature and oil 4.11.3.2

Cause and disposal

(1) The cooling water amount of oil cooler is small or cooling water temperature is high; please increase cooling water amount and reduce cooling water temperature; (2) If oil cooler becomes dirty, please switch to spare oil cooler and contact repairman to dispose; (3) If the automatic lubricating oil regulator becomes ineffective, please switch to manual regulation; (4) When electrical heater of main oil tank misoperates, please immediately stop the operation of electrical heater; (5) Oil temperature may rise when set vibration is large, bearing runs out of order or shaft seal leaks steam greatly. greatly. Confirm the reason for respective problems and make corresponding disposal. 4.11.4 4.11.4.1

The reason reason for and disposal disposal of oil level level reduction of main oil tank If lubricating lubricating oil pipeline breaks and leaks oil, please adopt separation separation measures to stop leaking

and contact the repairman to dispose and meanwhile supplement oil promptly. If oil pipeline breaks seriously, seriously, carry out load shedding breakdown or emergency breakdown. Please confirm the necessary oil mass for coasting operation. 4.11.4.2

Sealing oil system has fault and leaks oil; dispose according according to relevant relevant fault disposal disposal regulations

of sealing oil system. 4.11.4.3

If oil cooler leaks, please switch to spare oil cooler and carry carry out separation separation treatment. treatment.

4.11.4.4

If oil purification purification device has fault fault and leaks oil, please close down the oil inlet inlet of the device device

immediately and stop oil purification device. 4.11.4.5

When the oil level of main main oil tank drops to -200mm slowly, slowly, promptly supplement oil; if oil fails to

supplement promptly and the oil level of main oil tank drops to -300mm suddenly, please break down Steam Turbine Operation Manual Page 104 of 197


emergently. 4.11.5

Disqualification reasons and disposal of lubricating oil quality

4.11.5.1

If mechanic sundries or water water enter after replacing replacing new set or repair due to halfway cleaning of oil

system, please strengthen oil purification or replace oil. 4.11.5.2

When shaft seal seal steam supply pressure is high so that water content in the oil increases, please

properly turn down the shaft seal steam supply pressure and turn up shaft negative pressure pressure with precondition that the condensate vacuum is not influenced. 4.11.5.3

The oil system system has hot spot and oil aging. Please strengthen oil filtration filtration or replace oil; oil; eliminate

hot spot. 4.12

High bearing temperature of automobile automobil e motor

4.12.1

Phenomena

4.12.1.1

Bearing temperature is high or alarms alarms according to DCS; DCS;

4.12.1.2

Return oil temperature temperature of the bearing reads high;

4.12.1.3

Set vibration possibility increases;

4.12.2

Cause

4.12.2.1

The cooling water system system of the oil cooler has fault and lubricating oil temperature temperature is high.

4.12.2.2

Lubricating oil pressure pressure is low or oil oil is unqualified.

4.12.2.3

Inlet and outlet outlet oil of the bearing is not smooth.

4.12.2.4

The set vibrates fiercely. fiercely.

4.12.2.5

Bearing damages.

4.12.2.6 4.12.2 .6

Shaft seal leaks steam greatly.

4.12.2.7

When the set overloads and extraction extraction steam system and vacuum system run out of order, thrust

bearing temperature temperature and return oil temperature temperature will rise. 4.12.3

Disposal

4.12.3.1

When bearing temperature temperature and return oil temperature temperature are higher than than normal value, please

immediately check following parameters and examine at site: (1) Whether DCS temperature reading of the same bearing and local return oil temperature rise together; (2) When temperature of all bearings rises due to high lubricating oil temperature, low lubricating oil pressure or high revolving speed of the set and large set vibration, please immediately regulate to normal condition; (3) Check the oil flow of return oil observation window of the bearing and carefully listen to internal sound of the bearing. 4.12.3.2

Regulate lubricating oil temperature temperature and pressure pressure to normal level.

4.12.3.3

If the oil oil quality is unqualified, unqualified, please strengthen strengthen oil filtration filtration or replace replace oil; if the oil ages, please Steam Turbine Operation Manual Page 105 of 197


break down. 4.12.3.4

When temperature temperature rises rises due to that thrust bearing overloads, overloads, please regulate set load.

4.12.3.5

If the shaft seal steam leakage is large, large, please properly reduce shaft seal steam steam pressure with

precondition that condenser condenser vacuum is ensured. ensured. 4.12.3.6

When support bearing bearing temperature temperature is up to 113 113℃ or thrust bearing temperature is up to 107 ℃ or

return oil temperature is up to 82 ℃, the disposal is ineffective and it shall break down. 4.13

EH oil system fault

4.13.1

Common faults

4.13.1.1

Oil pressure sloshes.

4.13.1.2

Oil pressure drops.

4.13.1.3

The oil level of oil tank drops.

4.13.1.4

Oil pipeline leaks.

4.13.1.5

Oil temperature is abnormal.

4.13.1.6

Oil is unqualified.

4.13.2 4.13.2.1

Fault disposal When EH oil pressure sloshes, please immediately examine the working condition of operational operational

oil pump and examine whether spillover valve acts and whether oil level of oil tank is normal; inspect the working condition of outlet checkup valve of spare oil pump. Please switch to oil pump if oil pump fails to operate in order. 4.13.2.2

Oil pressure reduction reduction may be caused due to abnormal working working condition of oil pump, system

leakage, blocking of filtration network or acts of spillover valve. Please dispose according to respective conditions. (1) Please switch to spare oil pump if oil pump fails to work in order. (2) If oil system leaks, please separate the leaking point and promptly contact the repairman to supplement oil with precondition that EH oil pressure is not too low; if the oil leakage is too serious to separation, please break down. (3) If it is due to large filtration network pressure differential, please separate. (4) When oil pressure drops to 11.2Mpa, spare pump shall start automatically, otherwise start by hands; when oil pressure drops to 9.8Mpa, break down by protection action, otherwise break down by hands. 4.13.2.3

When the oil level of the oil tank drops to 450mm, 450mm, make alarm and promptly supplement supplement oil. Oil

level reduction is generally caused by oil leakage of oil pipeline or leakage of oil cooler, please adopt separation measures for this reason; when oil level cannot be separated so that oil level continually drops and fails to sustain, please break down. 4.13.2.4

When oil temperature temperature is abnormal, abnormal, please examine examine the operation operation and breakdown breakdown condition of the



heat pump, working condition of cooling water at site and operation of oil cooler. 4.13.2.5

When oil is unqualified, unqualified, please examine whether whether the system regeneration pump runs in order and

whether the operation of kieselguhr network is normal. Please replace if necessary. necessary. 4.14

Low Sealing oil pressure

4.14.1

Cause

4.14.1.1

Sealing oil pump runs out of order;

4.14.1.2

Sealing oil filtration network is seriously blocked;

4.14.1.3

Sealing pad leaks oil seriously;

4.14.1.4

Recycling valve valve of sealing oil pump is opened opened by mistake mistake or is out of order;

4.14.1.5

Pressure difference regulation valve is out of order. order.

4.14.2

Disposal

4.14.2.1

Check input of spare oil source and input of spare oil oil pressure difference difference regulators regulators in order to

ensure that oil/hydrogen pressure difference is normal; 4.14.2.2

If it caused due to serious blocking blocking of sealing oil filtration network, please switch filtration

network and contact relevant personnel to dispose; 4.14.2.3

If it is caused due to recycling recycling valve of sealing oil pump, please please regulate recycling valve;

4.14.2.4

If sealing pad leaks oil seriously, seriously, please report report to the leader and contact for for disposal; please please apply

for breakdown if it fails to maintain operation; 4.14.2.5

If pressure difference regulation valve is is out of order, order, please regulate regulate bypass valve valve by hands to

keep supplying oil to sealing pad and contact repairman to dispose. 4.15

Recycling water pump fault

4.15.1 4.15.1.1

Pressure difference difference of inlet filtration network of recycling water water pump is large large Phenomena

(1) The surface of filtration network becomes dirty and the water level of absorption well of recycling water pump is low; (2) When the water level of absorption well of recycle pump is low, the motor current of recycling water pump fluctuates and outlet water pressure fluctuates. Cavitations of recycling water pump may occur if it is serious; 4.15.1.2

Cause

(1) Recycling water quality is bad and plankton is much; (2) The effect of trash remover of the filtration network is bad; (3) Trash remover cannot operate for long time or the automatic start becomes ineffective. (4) Blocked by large-size sundries. 4.15.1.3

Disposal Steam Turbine Operation Manual Page 107 of 197


(1) Contact repairman to dispose trash remover and start as soon as possible; (2) When the pressure difference of filtration network continually enlarges, please pay close attention to monitoring the working condition of recycle pump and please stop the recycling water pump when cavitations of recycling water pump occur. Please note the vacuum condition of the condenser. condenser. (3) When the pressure difference of the filtration network reaches 200mm, the flush water pump starts and operates automatically; when the water level difference before and after filtration is ≥ 400mm (adjustable), the filtration network and flush water pump start automatically and run at high speed continually and immediately send alarm signal to on-duty room (or control room). (4) If the recycling water quality is bad, please contact chemical dosing disposal. 4.15.2 4.15.2.1

Inversion of recycling water pump Phenomena

(1) When recycling water pressure reduces, the outlet pressure of inversion recycle pump indicates. (2) Local recycling water pump runs in inverse direction. (3) When inversion is serious, the water level of absorption well at inlet of recycle pump rises. 4.15.2.2

Cause

(1) Outlet butterfly valve is not completely closed after recycling water pump stops. (2) Outlet butterfly valve is opened by mistake when recycling water pump is spare. (3) Outlet butterfly valve is opened but not started when recycling water pump is started. (4) Start recycling water pump and open outlet butterfly valve when motor supply source of recycling water pump is at test position. (5) When motor phase order of recycling water pump is inversely i nversely connected, reverse after start. 4.15.2.3

Disposal

(1) When switch the interconnected control way of inverse recycle pump butterfly valve on DCS to “eliminate” position, close the butterfly valve by hands; if it fails to close, please immediately examine and confirm whether butterfly valve is opened at butterfly valve control station and reverse recycling water pump. If the control station is power-on, power-on, please switch butterfly valve control way to “location” and close butterfly by hands. If the control station is power-off, power-off, please immediately open manual discharge valve to close butterfly valve and recover control power supply as soon as possible. Please open manual discharge valve as soon as the power supply of butterfly valve control station powers off. (2) If recycling water pump is started at test position so that the butterfly valve is opened, please immediately stop test and close butterfly. butterfly. Continue after contacting hot worker to connect relevant joints. (3) When butterfly valve opens but the recycle pump does not start in starting recycle pump, please trip the pump immediately and examine and confirm that butterfly valve shall be closed. Otherwise dispose at site and contact repairman to dispose the start failure of recycle pump. Steam Turbine Operation Manual Page 108 of 197


(4) If the phase order of the motor is disordered, please immediately close down and contact repairman to dispose. 4.15.3

Other faults

4.15.3.1

When the bearing bearing oil level of motor drops, please examine whether whether the oil discharge discharge valve valve is

closed tightly and whether oil pipeline leaks and supplement oil promptly. 4.15.3.2

When bearing bearing oil level of the motor motor rises, please please examine whether whether oil emulsifies emulsifies or has white foam

to judge whether water enters oil. Close down the pump if necessary. 4.15.3.3

When pump set set vibration enlarges enlarges abnormally abnormally,, please examine examine motor current and listen to to sound in

pump; if the outlet pressure and current of recycle pump fluctuate greatly, greatly, please examine whether the water level of absorption well of recycle pump is too low and whether inlet filtration network is blocked. If the motor current of recycle pump increases and protopipe pressure decreases, please examine whether outlet butterfly valve slides down or is closed. Please reopen the outlet butterfly if it slides down and contact repairman to dispose if reopening fails. 4.15.3.4

When the motor motor coil temperature temperature of recycle recycle pump rises, please please examine whether cooling water

pipeline is blocked. 4.15.3.5

When the water water level of recycle pit rises, please promptly promptly start sewage sewage pump and examine outlet

water source in case that the part under butterfly valve control is submerged. 4.16

Closed cooling water system failure

4.16.1

Common faults

4.16.1.1

Closed cooling water interruption

4.16.1.2

Decline or fluctuation fluctuation of the main pipe pressure of closed cooling water

4.16.1.3

The closed closed cooling cooling water water tank tank is in low water level.

4.16.1.4

Heavy vibration in the closed closed cooling water water pump

4.16.1.5

Abnormal increase of the motor current current of the closed cooling water water pump pump

4.16.1.6

Worsen water quality of closed closed cooling cooling water water

4.16.2 4.16.2.1

Failure disposal If the main main pipe pressure of the closed cooling water is declined, declined, operation of the closed water water

pump shall be checked on whether the level of the closed cooling water tank is too low, low, and whether the water discharge valve of this system is closed tightly. In the condition that the output pressure of the pump is deficient or lower than 0.35MPa, please check whether the backup pump automatically starts, otherwise please start the backup pump manually. manually. 4.16.2.2

If the pressure of the closed cooling water main pipe fluctuates hugely with motor current current beat, it

is generally caused by the low water level of the closed cooling water tank or the air admitted in the pump. When the water level is low, low, please replenish water to the normal level in time; when the differential differential pressure Steam Turbine Operation Manual Page 109 of 197


of the strainer blockage on the pump inlet is larger than or equal to 0.02MPa which leads to automatic start of the backup pump, the original operation pump shall be ceased and its outlet strainer shall be cleaned; when air gets in the pump, related air relief shall be opened to discharge air. Switch to backup pump immediately when it evaporates. 4.16.2.3

When closed cooling water water pump fluctuates hugely, hugely, please please check check

pump bearing and pump pump have have

abnormal sound. Please switch to backup pump immediately if above conditions appear. 4.16.2.4

If the motor motor current increases increases according to the display, display, please measure measure whether it truly increases.

The current increase may be caused by two-phase operation or bearing damage. Please switch to the backup pump and contact the repairman repairman to dispose. 4.16.2.5

If the closed cooling water quality gets worsen, it may may be caused by the pollution of the

replenished water source. Please change the water and contact with relevant staffs for chemical dosing. 4.17

Faults of auxiliary equipment equipment

4.17.1

The rotating equipment shall be stopped urgently urgently in case that one of the following situations situations occurs:

4.17.1.1

Equipment vibrates fiercely. fiercely. Dynamical Dynamical frication and static frication occur. occur.

4.17.1.2

There is clear clear metal stipulation inside the the equipment. equipment.

4.17.1.3

The motor is smoking or on fire.

4.17.1.4

The bearing’s fuel is cut off or or is smoking.

4.17.1.5

Other faults faults that threat the safety of equipment equipment and people occur occur..

4.17.2 4.17.2.1 4.17.2.2

Start the back-up auxiliary equipment equipment first, and then stop the fault equipment in the following cases. Abnormal noise of the equipment Electric current of the motor increases increases abnormally, abnormally, insulation smells burning or temperature of

the motor coil is over-limit. 4.17.2.3

Two Two phase operation of the motor

4.17.2.4

Vaporization of the pump in operation

4.17.2.5

Temperature Temperature of the bearing bearing exceeds the limit.

4.17.2.6

Air cooling system fault of large-scale motor

4.17.2.7

Packing generates heat, smoke or leaks a large number of oil or water, water, and and the adjustment is

invalid. 4.17.2.8 4.17.3

Other situations situations that threat the safe operation of the auxiliary equipment When the motor starts, it must be stopped immediately immediately if the following abnormities abnormities occur. occur.

4.17.3.1

After starting, the current doesn’t return in a long time.

4.17.3.2

After closing the power switch, the motor can’t work and buzzes.

4.17.3.3

The motor sparks or smokes.

4.17.3.4

The equipment equipment vibrates abnormally abnormally,, and there is serious leakage leakage in the place that connects pipes



and flanges. 4.17.4

Heavy vibration of the auxiliary equipment

4.17.4.1

Phenomena

(1) Both in situ measurement and distant indicated vibration amplitude value show all high. The responding auxiliary equipment vibrates heavily, which may cause alarm. And auxiliary equipment with vibration protection may trip if reaching operation value. (2) If there is abnormal noise in s itu, the temperature of the bearing may increase. (3) If the water pump vibrates strongly because of vaporization, there is more abnormal noise in situ. 4.17.4.2

Cause

(1) Centering of the coupling doesn’t meet the requirement or coupling is damaged. (2) Rotor center is not standard. (3) The mounting clearance of the bearing is too big or the bearing is damaged. (4) Anchor screw is loosened or mechanical connection is loosened. (5) Vaporization of the water pump 4.17.4.3

Disposal

(1) If the rotor center is not standard, adjust it to be standard. (2) Check whether the bearing is damaged or not; the loosened part of anchor screws or mechanical connections shall be fastened. (3) Adjust effectively effectively and immediately when surge or vaporization occurs. (4) For equipment without vibration protection, operation shall be stopped when vibration increase abnormally to limiting value. (5) It shall be regarded as big vibration when vibration of the auxiliary equipment exceeds the value in the following table: Rated speed (r/min)

7600

3000

1500

1000

750

vibration amplitude(um) (double amplitude um)

40

50

85

100

120

4.18

Reversion of the steam pump

4.18.1 4.18.1.1

Phenomena Rotate speed of small machine falls to zero zero and then rises again, check check the rotation rotation of the rotor rotor in

situ, and there is abnormal noise inside the pump. The indicator “Pump Reversal” alarms. 4.18.1.2

Exit pressure of the steam pump pump is low and inlet pressure pressure is high

4.18.1.3

Bearing vibrates heavily. heavily.

4.18.1.4

Reverse direction of axial displacement increases.

4.18.1.5

Exit pressure of the booster pump is high.

4.18.1.6

Pressure and water level of the deaerator rise. Steam Turbine Operation Manual Page 111 of 197


4.18.2

Disposal

4.18.2.1

Close the pump pump outlet electric electric door immediately once the steam pump reversion is found. If If the

electric door of the steam pump is blocked or loses power, power, close it manually and immediately. immediately. 4.18.2.2

Stop operation operation of small machine and electric electric pump and close the exit electric door. door.

4.18.2.3

Close inlet main feed feed water electric electric door of the economizer, economizer, close high-pressure exit electric door

and cut off boiler water filling. 4.18.2.4

Close intermediate stage bleed-off bleed-off valve of the reversion reversion steam pump, and open minimum flow

bypass valve of the steam pump compulsorily. compulsorily. 4.18.2.5

Inlet electric door of the booster pump of reversion steam pump can’t be closed.

4.18.2.6

Pay attention attention to the normal operation of lubricating oil system of the small small machine.

4.19

Motor fault

4.19.1

Condition of operation interruption due to to the motor fault

Once one of the following conditions occurs, motor operation shall be stopped immediately. immediately. 4.19.1.1

When threatening the safety of person;

4.19.1.2

Motor and the electrical electrical equipment equipment it belongs to are on fire with smoke;

4.19.1.3

When the mechanical equipment it it drives is damaged, leading leading to the unable to run of the motor;

4.19.1.4

Strong vibration vibration or internal shock occurs, leading leading to the friction between between stator and rotor;

4.19.1.5

Rotational speed of the motor slows down rapidly, rapidly, leading to the increase or return to zero zero of the

current; 4.19.1.6

Rapidly increase increase of the temperature temperature of motor and bearing surpassing surpassing the allowed allowed value; value;

4.19.1.7

Disaster such as flood and and fire, etc. that endanger the safety operation of motor occurs.

4.19.2

Condition of operation interruption due to to the motor fault

Once one of the following conditions happens, important plant motors can start their backup equipment, and then stop running: 4.19.2.1

Abnormal voice in motor or charred charred smell smell of the insulation; insulation;

4.19.2.2

Flames or smoke occurs inside inside the motor or the start and conditioning device;

4.19.2.3

Stator current surpasses surpasses the normal operation operation value (with the same same amount of load);

4.19.2.4

Severe overheat of the cable cable lead of motor;

4.19.2.5

Cooling system of high capacity motor fails;

4.19.2.6

Three-phase imbalance current of motor surpasses 10% above. above.

4.19.3

When the tripped tripped motor affects affects the the output power or safety operation of the set, and no backup motor

or immediate start of the motor is available, it is allowed to coincide the tripped motor, the following condition will not be included: 4.19.3.1

Obvious short circuit circuit or damage damage occurs on the start and conditioning conditioning device of motor or the power



cable; 4.19.3.2

Human injury requiring the immediate immediate halt of machine occurs;

4.19.3.3

The machine driven by motor is damaged;

4.19.3.4

Motor strips due to the protection action.

4.19.4

When voltage of important motor motor loses or decline, decline, it is forbidden to manually cut the plant motor

within one minute. 4.19.5

Automatically strip during the operation of motor

4.19.5.1

Cause

(1) Turn-to-turn Turn-to-turn or inter-phrase short circuit of stator coil (2) Power cable fault (3) Driven machine locked dead (4) Stepping down of voltage (5) The action of protective relay or error operation of staffs 4.19.5.2

Disposal

(1) Start the backup equipment (2) When backup equipment is not available, please check the equipment as soon as possible. If no problem exists, restart the equipment. The equipment can be immediately restarted when mal-operation is confirmed. (3) If it strips when starting, please do not restart it before the cause is found out. (4) Following check shall be conducted to dispose the stripped motor: a. Which kind of protective action; b. Whether the short short circuit, ground connection connection and breakage breakage occurs in the coil and cable of motor; c. Whether the driven machine locks dead, the fuse burns out and the interlock circuit is in good condition; d. Whether the switching mechanism is in good condition, and the power switch and disconnecting link is well switched; e. Measure whether the insulation resistance of motor including the cable is in good condition. 4.19.6 4.19.6.1

Motor is on fire with smoke and burning smell Cause

(1) Stator and rotor crash due to the obliquity of the bearing center or the abrasion of bearing bush. (2) The coil insulation of stator becomes damp, pollution and ageing, which leads to the inter-phrase short circuit or ground connection fault. (3) Open weld or fracture of squirrel-cage bar 4.19.6.2

Disposal Steam Turbine Operation Manual Page 113 of 197


(1) Immediately pull open the power switch of motor. motor. (2) Please use dry powder fire extinguisher, 1211 fire extinguisher, carbon dioxide fire extinguisher or smog-like water spray. spray. It is forbidden to use strong water flow, sand or foam to extinguish a fire. (3) Conduct a detail check on motor. 4.19.7

Fierce vibration of motor

4.19.7.1

Cause

(1) Inconsistent of the center of motor and its driven machine leads to the bend of macro-axis, so that the machine is damaged. (2) Bearing of the set is damaged or the displacement of counterbalance loses its balance. (3) Stator and rotor rub or fan falls off (4) Open weld or fracture of squirrel-cage bar of rotor. (5) Machine vibrates and the foot-screw looses. 4.19.7.2

Disposal

(1) Start the backup motor (2) If no backup motor is available, please reduce the motor load, and check if the vibration is mitigated or eliminated, otherwise contact relevant staffs for disposal. 4.19.8

If temperature temperature of the motor increases abnormally abnormally,, check the following contents:

4.19.8.1

Check if the voltage is lower than the specified value, and whether the current exceeds the

specified value. Check whether whether the temperature of the cooling cooling air exceeds 35℃, whether the cooling system is

4.19.8.2

blocked, and whether the fan operates operates normally. normally. 4.19.8.3

Check whether the three-phase three-phase current is balanced, exceeding the specified specified value or not.

4.19.8.4

Check whether the machine is jammed jammed causing overload.

4.20

All auxiliary full-power loss

4.20.1

Phenomena

4.20.1.1

Unit trips, furnace furnace master fuel trips, machine machine trips and the the motor splits; alarm rings with with its

corresponding shiny plates are bright. 4.20.1.2

Auxiliary buses voltage of every section section drops to zero, the green light of their power power switch will be

lightened. 4.20.1.3

All the operational alternating current( AC) current( AC) auxiliary engines stop, and the backup ones are not

linked; electrically operated gate doesn’t move as operated. 4.20.1.4

All the direct current( DC) equipment are linked.

4.20.1.5

The AC lighting lamp lamp goes out and DC lighting lamp lamp is lightened darkening the control room. room.

4.20.2

Cause



High plant transformer trips with sections of 6KV and 400V losing their power, while fast-cut back of the backup power fails or backup standby transformer trips due to its failures. So all the emergency power supply fail their auto-switch over. 4.20.3

Disposal

4.20.3.1

Confirm that that the main main engine, straightway straightway pump of small turbine, straightway seal oil pump pump on the

airside are all started, otherwise can shut it by hands for several times until they are started. Check the lubricating oil of main engine, oil hydrogen differential pressure is normal. 4.20.3.2

Manually open the condenser condenser vacuum broken valve, shut all the the drain valves to the condenser condenser..

Input pneumatic motor of air pre-heater. Shut the manual vales of the stokehole fuel tripper valve and the return oil. 4.20.3.3

Inform all outside posts to do the corresponding corresponding disposal for the auxiliary auxiliary power loss. Reset all the the

tripping equipments, remove the interlocking of the standby equipments. 4.20.3.4

Immediately go to the diesel room to do the following inspection inspection and operation operation to the emergency emergency

power supply: (1) Confirm that the work switch of security 400V PC has tripped off, check whether the auto-start of the diesel generator is successful, otherwise start is manually, input emergency power supply, recover the emergency main line power supply. (2) After recovering the emergency main line power supply, recover the security MMC power in machine and furnace sections and the AC emergency emergency lighting step by step. 4.20.3.5

After recovering recovering the emergency emergency power supply, supply, do the following following work:

(1) Start the AC lubricating oil pump of the main engine, top shaft oil pump, AC seal oil pump on hydrogen side and airside, seal oil standby pump, AC oil pump of small turbine, electric motor of air pre-heater, pre-heater, AC flame flame detection fan. (2) Input the lubricating oil system of each assistant machine. (3) Shut entrance valve of the steam pump and electric pump, check the pump shall not roll backward. (4) Check and confirm that the HP, IP main steam valves, adjusting valves, HP discharge check valve, each check valve have been shut, shut all the relevant electric valve; open the relevant drain valve on the furnace side. (5) Check and adjust the position of air valves, baffles of all the pulverizing system is correct. Water-spraying electric valves of superheater and reheater are shut. (6) When the rotate speed of the main engine is zero, input the jigger. If before inputting the jigger, the rotor has stopped, turn the rotor in 180°, stay for some time, then input continuous jigger. jigger. (7) Check the UPS power switching is normal. Start the floating machine of the 110V, 220V DC system tripper. tripper. Shut down the relevant DC equipments. Steam Turbine Operation Manual Page 115 of 197


4.20.3.6

Open all the the close switches switches of each each 6KV section. Check the reason that makes the auto-input of the

6KV backup power failed, after the defect is removed, recover the power of each 6.6KV section and low plant changes running. 4.20.3.7

Recover the auxiliary power power step by step, and recover recover all all the systems systems according to the condition of

unit. If the temperature of LP cylinder discharging discharging steam is above 50℃, shall first start condensate

4.20.3.8

water pump, start a vacuum pump, keep the micro vacuum of the condenser, when the stainless steel tube cools and the discharging steam temperature is below 50 ℃, input the water circulation system. 4.20.3.9

According to the temperature difference state of the steam drum wall, ask the chief chief engineer for

feeding water to the boiler, keep the water level of steam drum and the water temperature of the deaerator normal. 4.20.3.10 4.21

Recover the other operation of unit running step step by step.

Generator cooling system fault

4.21.1 4.21.1.1

Hydrogen cooling system malfunction If smoking, fire or explosion happen happen to the generator, generator, emergence shutdown shutdown and hydrogen

discharging shall be done. 4.21.1.2

When generator generator is operating operating and hydrogen hydrogen purity in generator generator downs to 96%, discharge discharge hydrogen

and fill hydrogen. Make sure there is no fire operation near to sewage outfall when discharge pollution. Operate shall be slow in case of producing electrostatic that causing explosion and fire. 4.21.1.3

Hydrogen temperature temperature is abnormal, inspect inspect operation status of hydrogen hydrogen cooler. cooler. If automatic

regulation of hydrogen temperature does not work, manually regulate the temperature by using bypass valve and inform maintenances service to handle it. 4.21.1.4

When one hydrogen cooler cooler is shutdown due to malfunction, the load of the the machine unit downs to to

80%, strictly monitor the stator core temperature and temperature and oil temperature of generator. 4.21.1.5

when malfunction happens happens to the hydrogen hydrogen purity meter, meter, inform the maintenances maintenances service to

handle it and contact the chemistry department sample and analyze the hydrogen purity one time every four hours until the hydrogen purity meter is repaired and operates normally. normally. 4.21.1.6

When hydrogen pressure drops or there is hydrogen hydrogen leakage, employees shall check,

find the

reason and find out ways to solve it. (1) Sealing oil is broken. Emergence shutdown and emergence discharging hydrogen. hydrogen. (2) If pressure of sealing oil is low, normal pressure difference between oil and hydrogen cannot be maintained. Fine way to regulate sealing oil to normal or open backup pump. If pressure of sealing oil cannot be improved, low hydrogen pressure to operate. When hydrogen pressure drops, hydrogen pressure corresponding curve. Steam Turbine Operation Manual Page 116 of 197

control the load as


(3) When pipe fracture or leakage at valve flange, generator measuring leads causes hydrogen leakage, handle it without affecting unit normal operation, and if it cannot be handled, it shall be treated as shutdown. (4) When generator sealing pad or outgoing bushing is damaged, promptly report to the shift supervisor, and treat it as shutdown. (5) When the case of mal-operation or hydrogen discharging valve not closed tightly appears, correct wrong operation immediately, close the hydrogen discharging valve tightly, and make up hydrogen to the normal hydrogen pressure. (6) With the suspect of the leakage of generator stator coil or hydrogen cooler, immediately report to the value supervisor and shutdown to handle it if necessary. necessary. (7) If hydrogen hydrogen leaks in factory, factory, open windows immediately in relating areas immediately, immediately,

open fan on

the roof , improve air flowing, forbid all fire operation. 4.21.2

Water cooling system fault

4.21.2.1

If the stator cooling water pressure is low, low, please examine examine the working condition of operational

pump and switch pump. 4.21.2.2

When the water level level of water water tank is low, low, please supplement to to normal water water level.

4.21.2.3

When system system pipeline, valve, valve, water cooler and flange leak, leak, please adopt adopt separation separation measures and

contact the repairman to dispose. 4.21.2.4

If the system drainage drainage valve valve is opened by mistake, close close the valve.

4.21.2.5

Water break break of generator generator (inflow (inflow of generator is smaller than 1/2 rated flow).

(1) When water in generator breaks, it is allowed to operate with 100% rated load for 5s and spare pump starts operation within 5s; (2) When the stator cooling water volume vol ume is low and meanwhile the internal cooling water’s conductivity is smaller than 1.5us/cm, the generator may operate for 1h under 15% rated current; (3) If water break happens to stator winding of the generator during operation and parallel operation of two stator water cooling pumps recovers to normal condition, two pumps shall carry load in 15min operation before increasing load. load. 4.22

Fire

4.22.1

When fire fire is found within administration range, the operator shall ensure that:

4.22.1.1

Strengthen set operation operation maintenance maintenance and dispose dispose accidents accidents according to specification specification provisions.

4.22.1.2

Perform correct order of last post fast.

4.22.2 4.22.2.1

Disposal when fire occurs. When fire alarm alarm is sent, please rush to the fire site to know fire condition, condition, examine whether whether fire

fighting system runs in order and use relevant fire extinguishers to put out fire correctly. correctly. 4.22.2.2

When electrical electrical equipment meets fire, please firstly cut of power supply and then put out fire with Steam Turbine Operation Manual Page 117 of 197


fire extinguisher; when fire occurs surrounding electrical equipment or threatens the equipment safety, safety, please stop equipment and cut of power supply. 4.22.2.3

When the fire has not threatened threatened set operation yet, yet, please adopt relevant relevant measures to stop fire

extension, move inflammables out of fire site and put out fire as soon as possible. 4.22.2.4

Strengthen operation monitoring and make make preparation preparation for breakdown.

4.22.2.5

When fire is serious enough to threaten set safety, safety, please break down down immediately. immediately.

4.22.2.6

When it catches catches fire in or surrounding oil tank and oil tank safety is threatened seriously seriously,, please

damage vacuum breakdown and open the accident oil discharge valve of oil tank. However, please consider that lubricating oil shall be unceasingly supplied before set stops in case of burning the bearing. 4.22.2.7

When sealing oil system catches catches fire and the fire cannot be put out and threaten threaten the equipment

safety, please break down immediately and discharge hydrogen fast during coasting operation. Sealing oil system shall maintain till set stops. 4.22.2.8

When generator or hydrogen cooling cooling system catches catches fire, please please break down emergently and

meanwhile fill CO2 to discharge H2 in generator. Water Water cooling system shall maintain operation. 4.22.3

Extinguishment method, devices and tips:

4.22.3.1

If sundries that are not soaked soaked in oil catch catch fire, put out out fire with water, water, foam extinguisher and sand.

4.22.3.2

When sundries that that are soaked in oil catch fire, fire, please put out fire with foam extinguisher and

sand. 4.22.3.3

When oil in oil tank and other container container catch fire, fire, please put fire fire with foam extinguisher, CO2,

CCL4 and 1211 fire extinguisher. 4.22.3.4

Please put fire with wet wet cloth or by isolating air if necessary necessary.. However, However, it is forbidden to put fire

with sand and tap without nozzle. 4.22.3.5

If electrical electrical equipment catches catches fire, please put put fire with CO2, CCL4, 1211 and and dry powder

extinguisher after cutting off power supply. Do not put fire with foam extinguisher. If motor catches fire, do not put fire by injecting sand or large-amount water. water. 4.22.3.6

If electrical electrical equipment catches catches fire and it fails fails to cut off off power supply immediately, immediately, please put fire

with CO2 and CCL4 extinguisher. It is forbidden to use other non-insulation extinguishers. 4.22.3.7

If steam pipeline pipeline or other high-temperature high-temperature components components catch fire, do not put fire with CO2

extinguisher. extinguisher. Use water carefully in case that thermal stress damages equipment. 4.22.3.8

If the revolving revolving part and revolving revolving system of the equipment catch fire, it is forbidden to put fire

with sand and perform according to relevant regulations. 4.22.3.9 4.23 4.23.1

If hydrogen hydrogen system catches fire, fire, please put fire with CO2 and and 1211 extinguisher. extinguisher.

DCS fault All operators of DCS have faults



4.23.1.1

Phenomena

(hien tuong)

(1) All upper computers have “black screen” or crashes. (2) The mouse or keyboard operation interface fails to function. (3) All parameters and alarm readings on DCS interface do not change. 4.23.1.2

Cause

(1) Power supply fault of DCS (2) Signal interface circuit break of DCS (3) Internal software fault of DCS control. (4) Internal hardware fault of DCS. 4.23.1.3

Disposal

(1) If DCS fault appears and the boiler puts fire, dispose as extinguishment. (2) If boiler fire is not put out and main spare hard manual operation and supervisory instrument can be used temporarily to maintain normal operation, please switch to spare operation manner and meanwhile eliminate fault and recover the operator station’s operation way. Otherwise, please break down and stop the boiler immediately. immediately. If there is not reliable spare operation monitoring method, please break down and stop boiler. boiler. (3) Monitor boiler water level, combustion chamber draft, temperature, pressure and combustion condition according to local water level television, flame television, boiler water level, combustion chamber draft and main-heat/reheat steam pressure, temperature and other monitoring instruments. (4) Keep set load stably. When steam pressure is not stable, regulate the load properly by hands and maintain normal pressure. (5) Contact thermal technician immediately to examine and dispose. (6) If the boiler combustion working condition fails to control, parameters become abnormal and DCS fault cannot be eliminated promptly, promptly, please stop the boiler immediately. (7) After the boiler stops, please close oil, wind, smoke valves or baffle through manual or electrical manner and stop revolving equipment that shall be closed for emergency breakdown. 4.23.2 4.23.2.1

Fault of partial operator station When partial operator station fault occurs, please continually continually monitor the set operation with usable

operator station. 4.23.2.2

Stop significant operation.

4.23.2.3

Contact thermal technician to disposal fault.

4.23.2.4

If the fault fault cannot be eliminated, please please dispose according according to actual operation operation conditions at that

time. 4.23.3

Please dispose when controller controller or corresponding power power supply in the system meet fault: Steam Turbine Operation Manual Page 119 of 197


4.23.3.1

When accessory accessory controller or corresponding corresponding power supply fault appears, appears, please switch switch to spare

manual operation and dispose system fault fast. If it does not satisfy the conditions, the accessory controller shall quit operation. 4.23.3.2

When circuit circuit regulation controller controller fault or corresponding corresponding power supply supply fault occurs, please switch

from automatic operation to manual operation and meanwhile dispose system fault fast and adopt corresponding measures according to actual conditions. 4.23.3.3

When controller fault regarding boiler protection protection appears, appears, please please replace replace

or repair repair controller

membranes immediately; when boiler protection power supply fault appears, please adopt forced supply measures. Then please implement measures of preventing controller initialization. If the recovery fails, please stop the boiler emergently. 4.24

Anti-accident Anti-acci dent measures for preventing water inflow of turbine and main shaft curving

4.24.1

Examine and confirm that that cylinder has good heat preservation preservation conditions conditions before starting the steam steam

turbine. Do not start when heat preservation conditions are not satisfied to ensure that oversize temperature difference will not be caused during normal start-up and breakdown. When the temperature difference between top cylinder cylinder and lower cylinder cylinder is larger than 42 42 ℃, please break down. 4.24.2

All metal temperature temperature test points points of the steam turbine shall be complete complete and reliable reliable and the

eccentricity indication of the main shaft shall be correct. Before enhancing the revolving speed of the steam turbine to rated value, the eccentricity of main shaft shall not exceed 110% of original value (0.076mm 0.075mm). Otherwise do not start. The double amplitude range before revolving of the steam turbine shall not exceed 0.025mm. 4.24.3

Please keep barring barring for at least least 4h continually before before enhancing the revolving revolving speed of the steam

turbine to rated value. After breakdown, the rotor becomes static and immediately puts into continual barring. If continual barring meets fault and cannot be input, please turn by 180° every half hour. Input continual barring after eliminating rotor elastic deformation and heat deformation (meaning that the stay duration after barring shall be 1/2 duration duration before barring). barring). 4.24.4

Please make all all efforts to prevent operate under 60MW load for long time when when the set starts and

breaks down. Please frequently frequently examine and carefully listen to the sound in the cylinder and shaft seal during during normal operation and report and dispose promptly when abnormal conditions are found. 4.24.5

Please strictly perform the valve valve examination examination card before before start. Examine Examine and confirm confirm that all dredge

valves are opened before enhancing the revolving speed to rated value and dredge is smooth by manual feeling. 4.24.6

Supply steam to shaft seal seal first and vacuumize vacuumize in hot start. Before Before supplying steam to shaft seal, seal,

please drain water from overall heating pipe of shaft s eal system in case that cold steam or water enters shaft seal. the shaft seal temperature shall match the metal temperature of steam cylinder; the maximum steam Steam Turbine Operation Manual Page 120 of 197


temperature of shaft seal shall not exceed 375 ℃; light the boiler after condensate vacuum realizes. 4.24.7

The revolving speed of the set shall be enhanced in “automatic” manner as possible and the program

shall not be interfered randomly. Please strictly perform 600r/min low-speed friction examination. Arrange full-time person to monitor the vibration, pad temperature, differential expansion and metal temperature of TSI system of the steam turbine during start and meanwhile arrange full-time person to monitor the vibration and general differential expansion of all bearings at site. It is forbidden to stay at critical revolving speed. Once vibration value overruns (especially close to the first critical revolving speed), please close down immediately. immediately. Do not reduce speed for observation. 4.24.8

Give close monitoring monitoring to the change of parameters parameters such as boil water level, level, axial displacement displacement of

main engine, differential expansion, vibration, main-heat/reheat steam temperature and strictly control the change rate of main-heat/reheat steam temperature during starting or closing the set and varying working condition. When main steam temperature drops to trip value while protection fails, please close down by hands immediately. immediately. If the steam temperature drops by 50 ℃ within 10min, please close down immediately. 4.24.9

Do not operate operate high-pressure high-pressure heater when the load is lower lower than 20%. Pay close attention to monitor monitor

the water level of high-pressure heater and deaerator under any working condition (especially during the set starts or closes down). Please examine and confirm protection is correct when the heater is full of water, otherwise step out by hands and examine whether electrical steam extraction valve and check valve are closed. Switch water supply to bypass and start water dredge of steam extraction pipeline. 4.24.10

After high and low bypass system stops, please please close manual temperature reduction valve reliably. reliably.

4.24.11

After repair or spare close-down close-down and before before the temperature temperature of steam turbine cylinder cylinder reaches

environmental temperature and steam-water system is not separated completely, the steam turbine shall be considered under operation status; continue monitoring the water level of condenser and metal temperatures of all parts of the cylinder and record the readings at regular intervals. Close electrical valve and manual valve of cold section and four extraction pumps to accessory steam, close condensate water to supplementation valve of hydrogen station, close supplementation valve of condenser, close inlet valve from supplementation box to condensation pump, close temperature reduction valve to heating in case that condenser is full of water. The water level of condenser when water injection leakage examination is made shall not exceed 8.5m and temporary water level monitoring measures shall be adopted. After leakage examination, start all relevant dredge valves to drain water. 4.24.12

Do not stop supplying supplying steam to shaft seal after after close-down and before vacuum vacuum comes to zero in

case that cold air enters. During coasting operation of the rotor, do not damage the vacuum and analyze and record the rotor coasting operation time. Do not transmit shaft seal steam under no-barring status. In half hour after rotor coasting operation ends, drop vacuum to 30kPa and operate. Before condenser vacuum comes to zero, please close all dredge valves to condenser and open vacuum damage valve. Steam Turbine Operation Manual Page 121 of 197


4.24.13

Carefully perform perform work at regular intervals, intervals, complete activity test test of main steam valve and

extraction check valve, report problem to dispose promptly. Quit corresponding heater if necessary. necessary. 4.24.14

The sliding cylinder temperature temperature of the steam turbine shall not be lower lower than 400℃.

4.24.15

During barring period after after close-down, it is forbidden to examine and and repair systems regarding regarding the

steam turbine in case that cold air enters cylinder. Please examine and make measures according to special conditions. 4.25

Anti-accident Anti-accident measures measures of preventing preventing oil leakage and pad burning burning of the steam turbine turbine

4.25.1

The oil level level of main oil tank shall be be kept during 0~150mm during normal normal operation, while oil level level

of small oil tank shall be kept at normal oil level (monitor according to local oil level gauge). 4.25.2

Operate oil level level gauge of main main oil tank once every every day to examine examine and confirm oil level gauge is

out of jam and oil level alarm is normal. The reading of two oil level gauges shall be consistent. 4.25.3

The oil level level alarm test of small oil tank is normal.

4.25.4

Alarm signal test of oil purification device device fault is normal. normal. Please examine examine regularly during during

operation of the device and immediately separate and note the oil level of main oil tank if device leaks oil. Supplement oil to normal level when it reduces. 4.25.5

Accident oil discharge discharge valve valve and water water drainage valve of main main oil tank and small small oil tank shall be

closed tightly and locked with w ith “no operation” alarm card. 4.25.6

Store certain amount of qualified turbine oil within 100m3 oil tank. Lubricating oil transportation

pump shall reach good spare conditions in order to ensure that main oil tank and small oil tank may supplement oil promptly. promptly. 4.25.7

During normal operation, please examine immediately immediately if oil level level of oil tank drops. drops. If oil pipeline pipeline

leaks, please separate or block oil; pay attention to the change of oil level of oil tank and supplement oil if necessary. 4.25.8

Examine whether whether oil cooler leaks and switch to separate if it leaks.

4.25.9

Examine the sealing oil system: system: oil level gauge of sealing sealing oil tank at empty side side is normal; if oil

pipeline leaks oil, please separate; separate; 4.25.10

If the oil level level of main oil tank drops and and continues dropping to -300mm even after

supplementation, please damage vacuum and close down to ensure coasting operation oil of the steam turbine. 4.25.11

Strictly perform perform relevant tests and and fixed-period working working provisions of main oil system in the

specification. 4.25.12

Keep close attention to the the temperature temperature of thrust pad, shaft pad pad tungsten and and return oil during start, start,

close-down and operation of the set. When the temperature exceeds the limitation, please report promptly and dispose decisively according to the specification provisions. Steam Turbine Operation Manual Page 122 of 197


4.25.13

It is forbidden that spare pumps are used used for other work during normal normal operation so that all spare spare

oil pumps are occupied. 4.25.14

Prevent that the set operates operates when vibration vibration is unqualified. unqualified.

4.25.15

Test Test oil quality at at regular intervals intervals and promptly dispose degradation of oil quality quality.. If oil quality

and cleanliness overrun, do not start the set. Test the oil quality in main oil tank once every month. 4.25.16

When abnormal abnormal conditions that may damage bearing pad appear during during operation (such (such as water

impact and instant oil outage, etc.), please restart after confirming that the bearing pad is not damaged. 4.25.17

Low oil pressure pressure protection, thrust bearing protection and low oil pressure interlocking shall be

reliable and normally input and shall not be removed randomly. randomly. 4.26

Main steam valve or regulation valve jam after the steam turbine trips trips

4.26.1

Symbol:

4.26.1.1

Steam turbine trips.

4.26.1.2

“Close” signal of high-pressure high -pressure and middle-pressure middle-pressure valves fail to send out.

4.26.1.3

High-pressure and middle-pressure middle-pressure regulation valves in DEH interface are not switched off to “0”

completely. 4.26.2

Disposal:

4.26.2.1

Examine whether the revolving revolving speed of the steam steam turbine turbine drops. drops.

4.26.2.2

After the steam turbine trips, the steam valve jams and is not closed closed completely; completely; it shall be

disposed as normal close-down if revolving speed drops fast. 4.26.2.3

After the steam steam turbine trips, trips, the steam valve jams and is not closed completely so that the

revolving speed rises; please stop vacuum emergent close-down. close-down. 4.26.2.4

Stop vacuum pump operates and discharge discharge boiler pressure pressure as soon soon as possible. Stop operation operation of A

and B machine and stop operation of EH oil pump. 4.26.2.5

Contact the repairman repairman to dispose the jam fault of steam steam valve and find out the reason. Restart Restart after

the fault is eliminated. 4.27 4.27.1

Anti-accident measures of preventing preventing overspeed operation of of the steam turbine turbine Insist performing performing overspeed, oil injection and static test of the steam turbine according according to the

regulations and ensure that the speed conversion rate and dead-band comply with the regulation. 4.27.2

The oil filling test of the set set is normal normal and movement movement is flexible flexible and correct.

4.27.3

After one-month one-month close-down after after set overhaul overhaul and emergency emergency governor is disassembled, please please

carry out overspeed test according to the method of enhancing revolving speed. 4.27.4

In carrying out overspeed test necessary for cold start of the set, set, please firstly connect to the grid, grid,

warm the set at low load according to regulations and carry out test. 4.27.5

Please ensure ensure that the speed rises stably when governor overspeed overspeed test is carried out. Steam Turbine Operation Manual Page 123 of 197


4.27.6

Thermal overspeed overspeed protection protection signal shall be tested after minor repair and overhaul to ensure that the

action value of thermal signal is correct and additional protection may be input stably. stably. 4.27.7

The test period of overspeed constraint slide valve valve of hydraulic hydraulic system (OPC) shall shall be the same same to

that of overspeed test. 4.27.8

If find IP, IP, HP automatic automatic main steam valve and steam adjusting valve have have jam fault, please

immediately report and promptly eliminate the faults and carry out steam valve test according to relevant regulations. 4.27.9

Please examine examine the tightness of main steam valve, governing governing valve, extraction extraction check valve valve before before

start and close-down every time. Please promptly report if the tightness is not in good condition. Start after the faults are eliminated. 4.27.10

Steam quality quality and oil quality quality of the steam turbine shall be tested tested at regular intervals. intervals. Please adopt

corresponding measures if it is unqualified. 4.27.11

Please regulate the shaft seal seal pressure of the set rationally and prevent water water inflow in oil. Please Please

eliminate the water in oil as soon as possible. 4.27.12

In overspeed overspeed test, the regulation regulation steam steam valve shall shall be stably and gradually opened and the revolving

speed shall rise to the acting revolving speed of the safety cut-out. When regulation steam valve is opened to maximum suddenly, suddenly, please break down and stop immediately in case of overspeed operation. 4.27.13

Please choose proper parameters parameters in overspeed overspeed test and keep pressure and temperature temperature within ruled

range. Overspeed test can be carried out after parameters are stable. 4.28

If two pumps operate, while one steam pump trips, please dispose as electrical water supply

pump is not connected. 4.28.1

Phenomena:

4.28.1.1

50% RB alarm on DCS interface

4.28.1.2

The set load drops fast.

4.28.1.3

“Steam“Steam -feed water supply pump fault” light on alarm window lights and meanwhile and meanwhile accident horn

sounds. 4.28.2 4.28.2.1

Disposal: Immediately start electrical pump reception reception load by hands and examine examine RB movement. movement. Otherwise Otherwise

reduce load to 50% rated load by hands. 4.28.2.2

Immediately regulate the coal quantity of coal mill and stop relevant relevant coal pulverizing pulverizing system

according to conditions if necessary. necessary. 4.28.2.3

Please note and and monitor the boiler water level. If If the automatic water level regulation regulation fluctuates

greatly, greatly, please switch to manual regulation. 4.28.2.4

Please pay close attention to the change of main-heat/reheat main-heat/reheat steam steam temperature and promptly



contact on-duty staff of the boiler for regulation in case that the steam temperature drops greatly. greatly. 4.28.2.5

If the set of RB reduces reduces to 50% rated load, please examine examine and confirm that generator vibration, vibration,

differential expansion, axial displacement, thrust pad temperature and all bearing metal temperature and return oil temperature of the steam turbine are normal; condensate vacuum, pressure at monitoring section and shaft seal system are normal and maintain the load operation. If any parameter of the steam turbine comes to trip value and cannot maintain after regulation, please stop and break down. Report to and contact relevant staff and find out fault reason as soon as possible; eliminate the fault promptly, promptly, start trip steam pump and close down electrical pump. pump.


Vietnam Vinh Tan Phase II 2 !622MW Coal-Fired Power Generator Unit

5. 5.1

Startup curve Cold startup curve

Flow

Union start of high-pressure and middle-pressure cylinder-cold bypass start

Temperature/pressure

Load

Flow of high-pressure cylinder Inlet temperature

Flow of middle-pressure Revolving speed

3min

Reheat temperature

Load

Inlet steam pressure of middle-pressure cylinder

4min Maximum 3%

Time

Inlet steam pressure

82min Grid connection

25min 5% Load

132min 26% Load


Minimum 110min

Revolving speed


5.2

Warm startup curve

Flow

Warm no-bypass start of high-pressure cylinder


Load


Flow of middle-pressure cylinder Revolving speed

Revolving speed

Inlet temperature

3min Reheat temperature Load


4min Time

Grid connection 125min


5% load



Flow

Union start of high-pressure and middle-pressure cylinder-warm bypass start


Load


Flow of middle-pressure cylinder Inlet steam pressure

Revolving speed

3min Reheat temperature

Load

4min

Time

Inlet steam pressure of middle-pressure cylinder Maximum 3% 125min


5% load

26% load


Revolving speed


5.3

Hot startup curve

Flow

Hot no-bypass start of high-pressure cylinder


Load


Flow of middle-pressure

Reheat temperature


Revolving speed

Revolving speed

3min

Load

Inlet steam pressure of middle-pressure

4min

Time


50min 5% load



Flow

Union start of high-pressure and middle-pressure cylinder-hot bypass start


Load

Flow of high-pressure cylinder Inlet temperature Flow of middle-pressure cylinder Reheat temperature Revolving speed


3min

Load


4min Maximum 3% Time

50min


5% load

26% load


Revolving speed


5.4

Extremely-hot startup curve

Extremely-hot Extremely-hot no-bypass start of high-pressure cylinder


Flow

Load


Reheat temperature

Revolving speed

3min

Flow of middle-pressure cylinder Inlet steam pressure

Revolving speed

Load


4min

Time


5% load



Flow

Union start of high-pressure and middle-pressure cylinder-extremely-hot bypass start


Load


Flow of middle-pressure cylinder

Reheat temperature


Revolving speed

3min

Load


4min Maximum 3% Time


5% load

26% load


Revolving speed


6.

Auxiliary equipment start-stop

6.1

General provisions

6.1.1

Equipment start-stop precautions

6.1.1.1

The inspected auxiliary unit, after maintenance, maintenance, must be carried out the interlocking, interlocking, protection test, test,

the control loop, automatic devices, thermal interlock protection and mechanical devices, pneumatic devices before a trial run and and shall go into the a trial run after passing a specified specified test respectively respectively.. 6.1.1.2

Only passing the test run, can the inspected inspected auxiliary unit be put into operation or standby standby.. There

must have a maintenance person in charge when it goes into a test run. If the electromotor has been overhauled partially, it shall be connected with the auxiliary unit after the test turning to be correct. The power equipment of 6KV 6KV shall take a static switch test and make clear clear that it is good or inspected. inspected. 6.1.1.3

Check it before starting the test run of auxiliary unit, and then deliver the current to start after

confirming the start condition. 6.1.1.4

Measure the insulation of qualified qualified before delivering and starting starting for those electromotor that

whether they may be affected with damp or broken down for more than one week. 6.1.1.5

Start the the 6KV equipment and important important 400V equipment, and a specially-assigned specially-assigned person shall be

sent on the spot for monitoring. When startup, personnel on the spot shall stand at the emergency button, identify problems and timely break it down in case of fault occurring. 6.1.1.6

Two Two or more 6 KV auxiliary auxiliary unit cannot be started at the same time time and on the same bus.

6.1.1.7

If tripping occurs when the auxiliary unit starts, then eliminate the pre-fault pre-fault before re-starting.

6.1.1.8

If auxiliary equipments are equipped equipped with forced circulation circulation lubricating lubricating oil system or hydraulic hydraulic

control system, the oil systems shall be started two hours in advance. 6.1.1.9

Contact with with the relevant personnel before before the start of each auxiliary auxiliary equipment.

6.1.1.10

The auxiliary equipments shall be started started in accordance accordance with the logical relationship and try try to

avoid starting with a load. 6.1.1.11

Specially-assigned Specially-assigned person is needed needed when the auxiliary auxiliary unit starts starts to monitor the current current and

starting time. Stopping running immediately if the start-up time exceeds while the current has not return to normal. 6.1.1.12

Auxiliary equipment equipment start-stop shall shall generally be operated on the corresponding corresponding picture in the DCS, DCS,

and you shall pay attention to the control switch in the "Distant" position. If start-stop need to be operated on the spot, then the control switch shall be placed placed on the position of “ On “ On the spot” spot”. 6.1.1.13

When selecting selecting a auxiliary auxiliary unit for starting or standby application, pay attention to maintain the

auxiliary power with a even load distribution for each segment and shall void the load from concentrating on a certain segment as far as possible. 6.1.2

Inspecting content before the equipment starting Steam Turbine Operation Manual Page 133 of 197


6.1.2.1

Work tickets used to check check and start the equipment have have been taken back, check check that all the staff staff

shall leave from the spot , on-site check all staff out the scene. Check the equipment and its surrounding to keep it without sundry but sufficient lighting. 6.1.2.2

Check the appearance of the equipment equipment to ensure that it is a integrity one, firmly connected. connected. Safety

shield of the rotating part shall be refitted. Manhole door is tightly closed. The anchor bolts and coupling bolts are without loosening. Meters relating to the equipment equipment shall be put into operation. operation. 6.1.2.3

Check the equipment equipment bearing bearing to ensure that it is ready with the lubricant oil. The oil, oil level and

oil temperature shall meet the requirements. Cooling water or the sealing water of the equipment has been put into normal, and the temperature auxiliary unit and parts of the electromotor shall meet the requirements. 6.1.2.4

Check the electromotor electromotor to ensure that that the wiring is firm and the grounding grounding is good. Measuring Measuring

insulation shall be qualified. 6.1.2.5

Check the wiring of device in-place in-place accident buttons remains remains good and the safety safety shield is

complete. 6.1.2.6

Complete inspection shall shall be carried carried out according according to the system checking checking card. Keep Keep the oil and

water systems and pump oil-filled oil -filled and water-filled, exhausting the air. 6.1.2.7

For the auxiliary equipment equipment which can be moved with manual operation, operation, move the rotor to confirm confirm

that it can be rotated flexibly without jamming. 6.1.2.8

Complete the checking checking work before the start of auxiliary equipment equipment and deliver the power supply

and control power of the auxiliary unit and

its related system system devices after after ensuring that the starting

conditions have been met. 6.1.3 6.1.3.1

Checking after the start of equipments Rotate equipment bearing (W) and the temperature temperature rising of reduction gearbox gearbox shall comply with

the provisions of the manufacturer. If the manufacturer has no provisions, the general sliding bearing must not exceed 80 ℃, antifriction bearing must not exceed 100 ℃. (Calculated by ambient temperature of 40 ℃). The temperature of motor sliding bearing produced by Shanghai Electric Plant must not exceed 90 ℃; and antifriction bearing temperature must not exceed 95 ℃. 6.1.3.2

Vibration Vibration in each part of the equipment meets meets the specification. specification. Bearing vibration is generally generally

controlled according to the following table: Bearing vibration allowable values Rotating speed(rpm)

3000

1500

1000

750 and below

Allowed dual amplitude value(mm)

0.05

0.085

0.10

0.12

6.1.3.3

Motor temperature temperature rising and current indication meet the specification. specification.

6.1.3.4

The oil level of each lubricating lubricating oil tank is normal, no leakage in system. system.

6.1.3.5

Sealed portion of equipment shall be sealed well.



6.1.3.6

No abnormal abnormal noises and tribulation on equipment equipment and electromotor. electromotor.

6.1.3.7

Machinery joining of each each adjusting device shall be in good condition, without falling off. off.

6.1.3.8

Device inlet and outlet outlet pressure pressure and flow are normal. normal.

6.1.3.9

Recognize that the every interlocking and automatic adjustment device device are put into and normal.

6.1.3.10 6.1.4

The system device belonged belonged is remained remained no water water leakage, leakage, steam leakage and oil leakage.

Auxiliary equipment shutdown

6.1.4.1

Shutdown operation operation of auxiliary auxiliary equipment equipment shall be carried out in accordance accordance with the equipment

outage logical relationships. 6.1.4.2

Consider the protection and and interlocking relationship relationship comprehensively before the outage of

auxiliary equipment and prevent the equipment linkage, tripping and other unsafe situations from occurring. 6.1.4.3

Properly monitor monitor the auxiliary auxiliary equipment equipment after its outage and isolate it immediately if it inverts.

6.1.4.4

Stop the auxiliary auxiliary unit when the repair and and isolation work is carrying out and then isolating isolating

operation can be carry out. 6.1.5

Emergency shutdown conditions of auxiliary equipment

6.1.5.1

When violent violent vibration or channeling axis occur and there is danger of damage to the equipment. equipment.

6.1.5.2

When the bearing temperature temperature rises abnormally abnormally or exceeds a specified value.

6.1.5.3

When the motor rotor and stator are in serious friction friction or smoking to fire.

6.1.5.4

When the auxiliary unit rotor and enclosure enclosure are are in serious friction friction or impact.

6.1.5.5

When a fire fire or flooding occurs in auxiliaries. auxiliaries.

6.1.5.6

Endanger personal safety. safety.

6.2

Open cooling water system falling into stop Open circulating cooling water: It is seawater. The design temperature:33 ℃, the design pressure is

0.4MPa (g), running water pressure is ~ 0.2MPa (g). Within the auxiliary equipment, vacuum pumps, turbine lubricating oil cooler, closed water heat exchanger adopt open circulating cooling water (sea water) for cooling. 6.2.1 6.2.1.1

Open cooling water system input Checking before the start of open pump

(1) Confirm that the system and pump interlock test are qualified; (2) Circulating water system is normally put into operation; (3) Open the electrically operated gate before and after the open pump inlet filter, close the bypass door, close the blowdown door after the blowdown with strainers, and import the inlet filter control into "automatic" controlling mode; (4) Turn off all the system water discharge valve and open the open pump access door; (5) Open the pump body of open pump and system air relief, then close it when seeing the water; Steam Turbine Operation Manual Page 135 of 197


(6) Open the cooling water terminal valve of the closed cooling water heat exchanger (A or B or C) to provide open water passage. 6.2.1.2

Open water systems putting into operation

(1) Start A or B open pump, check the exit door linkage to ensure that it can be opened normally. Motor current and ensure the vibration, sound, pressure and bearing temperatures are normal. (2) Keep the standby open water pump outlet valves in a fully-open condition and put them into standby application. 6.2.2

Open cooling water system shutdown

6.2.2.1

Confirm that the open water users already already have have conditions without water water..

6.2.2.2

Relieve the "standby" interlock interlock of the standby standby pump and close the outlet outlet valves of the standby

pump. 6.2.2.3 6.2.3

Stop the pump, the outlet valves valves of the original running open pump will close automatically. automatically. Open water pump switching

6.2.3.1

Check the standby open pump to ensure it is in standby application, meeting meeting the start start condition.

6.2.3.2

Check that the inlet door of the standby open pump is open.

6.2.3.3

Relieve the "standby" condition of the standby standby open pump.

6.2.3.4

Start the standby open pump, check its current, vibration, vibration, sound, outlet pressure, to ensure that they they

are normal and the DCS status indication is correct. 6.2.3.5

Stop the original running open pump, check check the instructions of DCS to ensure that it is correct and and

the in-place pump will not be reversed. 6.2.3.6

Check the open open water protopipe protopipe to ensure that it has no low pressure pressure signal and put the original

running pump into “ standby” condition according to the need. 6.2.4

Operation and maintenance of open water system

6.2.4.1

Differential Differential pressure of inlet screen of the open pump shall be no more more than 0.06MPa;

6.2.4.2

Open pump and motor bearing temperature are normal;

6.2.4.3

Temperature of the open pump motor coil, sound, vibration vibration and friction between the pump and each each

part of the motor. motor. 6.3

Closed cooling water system shutdown Circulating cooling water: water is demineralized water, the design temperature: 38 ℃, the design

pressure is 1.0MPa (g) (provisional), operating pressure is 0.55 ~ 0.65 MPa (g). Closed cooling water system is mainly to provide cooling water for equipments which require high cooling water quality, and also provide cooling water to: steam pump and fore pump mechanical seal cooler, electric pump and fore pump mechanical seal cooler, generator stator water cooler, generator air side sealing oil cooler, hydrogen side sealing oil cooler, hydrogen desiccators cooling water, open water pump bearing, EH oil cooler, condensate Steam Turbine Operation Manual Page 136 of 197


pump bearing mechanical seal s eal and generator cooler, carbon dioxide heater, heater, electric pump electromotor air cooler, electric pump and fore pump lubricating oil cooler, electric pump and fore pump operating oil cooler, electric pump electromotor air cooler, precision processing sampling, primary air fan bearing oil cooler, force draft fan oil cooler, induced draft fan oil cooler, main bearing of the seal fan bearing, coal mill oil station reduction gears, air pre-heater spigot bearing cooler, etc. 6.3.1 6.3.1.1

Closed cooling water system input Check before the input

(1) Open the inlet valve from the closed water tank to closed water protopipe; (2) Input the water level indicator into the closed cooling water tank; (3) Turn off all the wicket of the system, open the deflation valve closed after water, then close it when seeing the water; (4) Open the stop valve located before and after the automatic regulation valve of the closed cooling water tank level; (5) Start the condensation water delivery pump to replenish water into closed cooling water tank to a normal water level (condensate pump can be opened from its exit to the replenishing valve of closed tank); (6) Open the electrically operated gate of the closed cooling water pump entrance; (7) Open the inlet and outlet water valves of the closed cooling water cooler, infuse water into the pump and system with the air deflated and close air relief after finishing air deflating; (8) Provide the closed cooling water passage; (9) Check the oil quality of closed water pump bearing to ensure that it is good. 6.3.1.2

Confirm that the the pump body and water injection injection system is deflated and close close the pump discharge

door. 6.3.1.3

Start a closed cooling water water pump (A or B), look out that that the pump outlet valve linkage shall be start

until fully open, check the water level of the closed tank to ensure it is normal, or open the bypass valve for water replenishing, check the motor current, pumps vibration, sound, outlet pressure, bearing temperature to ensure that they are normal; regulate the closed water system users to ensure that the closed pump does not exceed the current. 6.3.1.4

Start the standby pump outlet valve and put it into “standby” application after finishing the deflating

of the closed standby water pump. 6.3.2 6.3.2.1

Closed cooling water pump interlock protection Allowable conditions of the closed pump starting

(1) Normal operation of open circulating cooling water system; (2) Water Water level of the closed water tank is not low; 6.3.2.2

Closed water pump tripping operation Steam Turbine Operation Manual Page 137 of 197


(1) Water Water level of the closed water tank is not low: ≤700mm; (2) Bearing temperature of the closed pump motor drive-end: drive- end: ≥ 95 ℃; (3) Bearing temperature of the closed pump motor non-driving non- driving end: ≥ 95 ℃; (4) Press the in-place emergency button. 6.3.2.3

Closed water pump interlock startup condition

(1) Closed water protopipe pressure is: ≤ 0.35MPa. (2) Stop running the closed water pump. (3) Differential Differential pressure of the running closed pump inlet valve strainer: ≥0.02MPa. 6.3.3

Closed water system shutdown

6.3.3.1

Confirm that all the closed water water users have have already met the conditions conditions of cutting off off the water

supply. 6.3.3.2

Relieve the the "standby" "standby" condition of standby pump and close its outlet valve.

6.3.3.3

Stop running the closed cooling water pump.

6.3.3.4

Check the outlet outlet valve of the operating pump pump to ensure that it is automatically automatically closed, or close it

manually. 6.3.3.5

Stop replenishing water into the closed closed cooling water tank.

6.3.3.6

Close the inlet and outlet valve valve of the closed water water cooler according according to the needs and stop the closed closed

water cooler. 6.3.4

Closed cooling water pump switching

6.3.4.1

Check the standby pump to ensure ensure that it is good and and has the the starting condition.

6.3.4.2

Check and and confirm that the water level level of closed tank is normal. normal.

6.3.4.3

Check and and confirm confirm that the inlet valve valve of standby pump starts.

6.3.4.4

Relieve the "standby" condition of standby pump.

6.3.4.5

Start the standby pump, check check that its current, current, vibration, sound, outlet outlet pressure is normal, normal, DCS

status indicator is correct. 6.3.4.6

After a comprehensive inspection, close the outlet valve valve of the original running pump, look out that

the closed water protopipe pressure is normal. 6.3.4.7

Close the original running pump, check check that the DCS status indicator indicator is correct.

6.3.4.8

Open the outlet valve of the original running pump.

6.3.4.9

Check the closed closed water protopipe protopipe to ensure that that it has no low pressure signal and and put the original

running running pump into “ standby” condition according to the need. 6.4

Auxiliary steam system shutdown Auxiliary steam system provides utility steam source for the whole plant. # 1, # 2 machines set two

auxiliary steam header with the pressure of 0.8 ~ 1.6MPa and the temperature of 367 ℃. Auxiliary steam Steam Turbine Operation Manual Page 138 of 197


header # 1 machines, respectively respectively,, connects the starting furnace and # 2machine auxiliary steam header. header. Units start-up auxiliary steam comes from the starting of the boiler or adjacent machine; low-load auxiliary steam comes from its own reheating and cooling segments or adjacent machine; steam supply comes from the four pumping during normal operation. Auxiliary steam system provide the steam to: coal mill separator fire fighting steam, coal mill fire fighting steam, deaerator heating, a small steam turbine debugging for steam supply, steam turbine shaft seal supply, supply, fuel oil atomization, etc. 6.4.1 6.4.1.1

System input Preparation before the auxiliary auxiliary steam putting into use

(1) Preparation in mechanical aspects sees the valve operation card. (2) Confirm and verify that the safety valve of auxiliary steam is normal. 6.4.1.2

Putting into use from starting starting furnace within plant area to auxiliary steam steam header:

(1) Ask for shift supervisor’s instructions for approving of putting-in-service putting -in-service of the auxiliary steam: (2) Confirm that auxiliary steam protopipe and the drain valves of each user’ door are fully -open, communicating door of # 1 and #2 machine auxiliary steam header according shall be started according to needs. (3) Open the starting furnace slightly to auxiliary steam electric gate, auxiliary steam begins to be heating and control the auxiliary steam protopipe to ensure that the pipe pressure is mo more than 0.1 MPa, without shocking and vibration on the pipe. (4) Check that there is steam emitting from all the drain pipes of auxiliary steam protopipe gradually and the auxiliary steam header pressure is gradually increased. (5) Warm the auxiliary steam protopipe fully, check the auxiliary steam pipe to ensure that the dewatering adjustment is normal after the temperature rising to 200 ℃, inform the starting furnace and start it gradually to the auxiliary steam electric gate and improve auxiliary steam header pressure to 0.2MPa. (6) When the auxiliary steam header temperature rises to 300 ℃, check to ensure that the dewatering is normal. Slowly and fully start the starting furnace for auxiliary steam electric gate, without shocking and vibration on the pipe. (7) Report to the

shift supervisor, supervisor, if necessary, necessary, put the auxiliary steam users into use to adjust auxiliary

steam pressure and temperature to normal. 6.4.1.3

Switch the auxiliary steam source to reheating reheating cold period of operation:

(1) Confirm boiler in this unit has been burned steadily and the unit load is: ≥20%. (2) Confirm that the isolation gate is open after the reheating cold section reaching to auxiliary steam adjusting door of the auxiliary steam protopipe, open the checking door in front of the cold section to a drain valve, open the drain valve in front of the isolation gate. (3) Check the auxiliary steam to ensure that the set value adjusting door pressure of cold segment Steam Turbine Operation Manual Page 139 of 197


steaming auxiliary steam is lower than the pressure of auxiliary steam protopipe, adjusting door is located at the self-closing position. (4) Fully open the cold electric steaming of auxiliary steam and then set the auxiliary steam cooling section inlet pressure of adjusting door higher than that of auxiliary steam header, then pay attention that auxiliary steam cooling section steaming adjusting door is slowly opened and adjusted automatically to the desired pressure setting value. Starting furnace can run in a reduced load. (5) Check to ensure that the auxiliary steam header and drain valves of each user are in regulation position as well as the auxiliary auxiliary steam pipes and safety safety valves have no leakage. leakage. 6.4.1.4

Switch the auxiliary steam source to the unit four pumping operations: operations:

(1) When the unit keeps in stable operation and the four pumping pressure reaches to 0.80MPa, auxiliary steam will be switched to four pumping supply. supply. (2) Confirm that all the dewatering of the auxiliary steam four pumping is regulated to normal, slowly open the four pumping steaming electric door of auxiliary steam, without shocking and vibration on the pipe. (3) Adjust the auxiliary steam cooling section inlet pressure setting of adjusting door to make it lower than the pressure of auxiliary steam four pumping, checking will rise with the auxiliary steam four pumping pressure and the cooling cooling steaming adjusting door of auxiliary steam will be closed closed gradually. gradually. (4) Starting furnace can stop running according to needs. 6.4.2

Shutdown of auxiliary steam system:

6.4.2.1

If it is necessary necessary to stop stop the auxiliary steam system, we shall be subject to the consent consent of the shift shift

supervisor and confirm that there is no auxiliary steam users before stopping. 6.4.2.2

Close the isolation cooling cooling section door and electric door of auxiliary steam; auxiliary steam

protopipe communicating door; d oor; electrically operated gate with four pumping for steam, starting furnace to auxiliary steam isolation doors and electric door. door. 6.4.2.3

Open all the drain valves of auxiliary auxiliary steam protopipe fully. fully.

6.4.2.4

Contact with the shift supervisor timely when carrying carrying out the operations, such as starting, stopping

and switching on the auxiliary steam system, etc. 6.5

Condensate system shutdown Condensate system delivers the exhaust steam of turbine low pressure cylinder to deaerator through the

condensation water coagulated from condenser within hot well and supplies water to boiler feed pump, and also provide desuperheating water to LP bypass, auxiliary steam and shaft seal steam supply attemperator, etc. 6.5.1

Preparation before the starting of condensate system

6.5.1.1

Preparation in mechanical mechanical aspects sees the the valve valve checking checking card. card.

6.5.1.2

Confirm that closed cooling water system runs normally; normally;



6.5.1.3

Infuse water water into the water water storage tank of demineralized demineralized water by contacting chemistry chemistry to about

6m. 6.5.1.4

Start delivery pump for condensation water

(1) Confirm that the inlet valve and recycling valve of the condensate pump are open, but the outlet valve of the pump closed. (2) Open the pump body air relief and the inlet strainer air relief of the condensate pump, then close it after seeing the water. (3) Keep the outlet valve slightly open, start the condensate pump, check that the pump and motor sound, vibration, bearing temperature, motor current, the outlet pressure are normal. 6.5.1.5

Water infusion infusion of condensate system and water replenishing of condenser

(1) Gradually open large the outlet valve of the condensate pump, appropriately adjust the opening of recycling valve door. (2) Open the condenser water bypass valve to the condenser water. water. (3) Close the water replenishing bypass valve when the condenser reaches a normal water level, slightly open recycling valve of condensate pump before stopping water replenishing. (4) Open the stop valves before and after the replenishing adjusting valve of the condenser, condenser, put the water level into automatic control. (5) Open the condensate pump to water injection valve of condensate system, open all the air reliefs of condensate system to perform water injection and air deflating. Close all the air reliefs when sees the water. 6.5.2

Starting conditions of condensate pump of condensate pump motor: <85 ℃;

6.5.2.1

Upper and lower bearing temperature

6.5.2.2

Condensate pump thrust bearing temperature: <75 ℃;

6.5.2.3

Open the condensate pump inlet valve;

6.5.2.4

High back pressure condenser water level: > 300mm;

6.5.2.5

Condensate pump seal water pressure: > 0.1MPa; 0.1MPa;

6.5.2.6

Condensate pump circulating circulating valve has been been opened: opened: > 95%;

6.5.2.7

Water level of deaerator water supply tanks not high, value III(3000mm) , and the water water level is is not

high, value II (2800mm). 6.5.3 6.5.3.1

Condensate pump startup Confirm that the condenser water water level is normal, test for each each interlock protection protection of the

condensate pump is qualified. 6.5.3.2

Confirm that the injection pressure pressure of condensate condensate system is more than 0.4MPa or and and then emptying

ends. 6.5.3.3

Confirm that the condensate condensate pump outlet pressure is normal. normal. Steam Turbine Operation Manual Page 141 of 197


6.5.3.4

Open the valves valves from condensate condensate pump outlet to the condensate condensate pump sealing sealing water gate, infuse

sealing water into the condensate pump. 6.5.3.5

Open the inlet inlet screen air air door of condensate pump, pump, pump body discharge air air valve and and outlet air

door in the front gate. 6.5.3.6

Open the inlet valve of the condensate condensate pump, infuse infuse water into into the condensate pump to ensure that that

the recycling valve of condensate pump is open. 6.5.3.7

Deliver power to condensate pump.

6.5.3.8

Open condensate pump with frequency frequency conversion conversion or power frequency frequency according according to the situation, situation,

pay attention that the current, vibration, sound pressure indication are normal. Look out that the outlet valve is opened automatically after the starting of the pump, or open it manually. manually. 6.5.3.9

Open condensate condensate pump outlet to the pump body sealing water gate, close the condensate condensate pump to

condensate pump sealing water gate. 6.5.3.10

Open another inlet valve of condensate pump, pump body body and suction valve valve in front front door, door, open the

inlet valve and put it into standby condition. 6.5.4 6.5.4.1

Condensate pump outage After the unit outage, confirm that LP cylinder exhausted exhausted temperature (HP (HP and LP LP condenser) condenser) is

lower than 50 ℃, while no other water users, condensate pumps can be stopped. 6.5.4.2

Relieve "standby” "standby” condition of the standby pump.

6.5.4.3

Stop the condensate pump

6.5.4.4

Note that the outlet valve of condensate pump shall be closed closed automatically, automatically, or shut down manually manually..

6.5.4.5

If it is necessary to isolate the condensate condensate pump for for repairing repairing after after stopping stopping it, we shall shall

close its its

pump body bod y and suction valve in front of the outlet door, close the inlet door, turn off the condensate pump outlet to the pump sealing water gate and close the condensate pump to condensate pump sealing water gate. 6.5.5 6.5.5.1

Condensate pump switching Check the standby standby condensate condensate pump to ensure ensure that it is in standby application, meeting the start

condition. 6.5.5.2

Check that the sealing sealing water input of standby condensate pump is normal.

6.5.5.3

Confirm that the standby pump inlet door is open.

6.5.5.4

Confirm that the standby pump outlet door is open.

6.5.5.5

Check that the the condensate condensate system is operating operating normally. normally.

6.5.5.6

Confirm that that standby condensate pump body and air damper damper of outlet outlet front door are open.

6.5.5.7

Relieve "standby” "standby” condition of the standby pump.

6.5.5.8

Start the standby condensate pump.

6.5.5.9

Check that the motor motor current, vibration, vibration, sound are normal normal after starting starting the standby condensate condensate



pump and ensure that the DCS status indicator is correct. correct. 6.5.5.10

Check that the condensate system pressure is normal.

6.5.5.11

Stop the original original running pump, outlet doors is closed automatically automatically,, check that the DCS DCS status

indicator is correct. 6.5.5.12

Check that the pump pump has no reverse reverse phenomenon phenomenon after after stopping running it.

6.5.5.13

Check the outlet water protopipe of condensate pump to ensure ensure that it has no low low pressure signal,

open the outlet door of to original running pump according to the needs and put the original running pump into “ st “ standby” andby” condition. condition. 6.5.6

Condensate pump operation and maintenance

6.5.6.1

Condensate pump outlet pressure is normal, the current current does not exceed exceed 226.4A.

6.5.6.2

Condensate pump thrust bearing oil is is qualified. Motor bearing bearing of temperature temperature condensate pump

does not exceed 85 ℃; 6.5.6.3

Condensate pump packing is without without leakage. Input Input of sealing water, water, motor motor bearings cooling cooling water

is normal. 6.5.6.4

Pumps and motors motors have no abnormal abnormal noise, motor upper and lower bearing bearing vibration is not larger

than 0.05mm. Motor coil temperature of the condensate pump does not exceed exceed 105 ℃.

6.5.6.5 6.6

Deaerator shutdown The deaerator uses the four-section steam extraction of steam turbine to heat the condensation water to

corresponding saturation temperature under its operation pressure. So it could remove the oxygen dissolving in the water and other non-condensed gas to prevent or lighten the oxygen corrosion of the boiler, steam turbine and the pipelines of its accessory equipment. By the meantime, the deaerator makes full use of heat energy by back heating to improve the thermal efficiency of the generator. generator. 6.6.1

Preparation before the deaerator is put into operation

6.6.1.1

Make sure the compressed air system works fine fine and the used used air pressure of the instrument instrument is

normal. 6.6.1.2

Make sure each instrument instrument of the deaerator deaerator is well-equipped well-equipped with instruments, instruments, each water level level

gauge works normal. 6.6.1.3

Make sure the auxiliary steam steam system works fine, auxiliary pressure and temperature temperature meet meet the

requirement. 6.6.1.4

Make sure sure the condensate system works works fine and water water quality is qualified.

6.6.1.5

The experiment experiment of water water level of deaerator and interlock protection of pressure is qualified. Put the

water level of deaerator, pressure and other equipments of measure and protection into operation. 6.6.1.6

Make sure the following valves are closed: Steam Turbine Operation Manual Page 143 of 197


(1) #1, 2, 3 From #1, 2, 3 HP heater to continuous air evacuating of No. 1 and No. 2 valves of the deaerator; (2) Relating isolation valves of nitrogen filled protection of the deaerator; (3) Emergence water drain valves and overflow valves of deaerator; (4) From #1, 2, 3 HP heater drain valve to isolation valves of deaerator; (5) From the four-stage extraction to electric isolation valve and check valve of deaerator; (6) Auxiliary steam to pressure regulating valves of deaerator and its isolation valve (7) From the continuous blowdown to deaerator valve. 6.6.1.7

Open the deaerator and start exhaust valves.

6.6.1.8

After the deaerator deaerator is repaired repaired or overhauling, or it it is the first time to be put into operation, all all

pipelines that going into the deaerator deaerator shall be flushed. flushed. 6.6.2 6.6.2.1

Put the deaerator into operation Make sure the the position of each valve of the condensate condensate system is normal, start condensation pump,

inject water into deaerator to normal level. 6.6.2.2

Open the booster booster pump entrance entrance valve valve of electric electric steam pump, open front-back front-back isolation valves valves of

recirculating regulation valve of electric steam pump, inject water and evacuate air to electric steam pump. 6.6.2.3

Open the booster booster pump entrance entrance valve valve of A, B steam steam pump, open front-back isolation valves of A,B

steam pump recirculation valve, inject water and evacuate air to A,B booster pump of the steam pump. 6.6.2.4

Inspect the electric steam steam pump. If If it meets the requirements requirements of start-up, start it. (Or start the booster booster

pump of steam feed feed pump and put deaerator heater into operation ). ). 6.6.2.5

Inspect and open open the HP auxiliary steam to the back drain drain valve of electric valve of the deaerator, deaerator,

open the HP auxiliary steam to heating pipe of electric valve of the deaerator. Pay attention to controlling temperature rise rate of heating pipe in case of its vibration. 6.6.2.6

Close the drain valve valve when pipe heating is over. over. Open the auxiliary auxiliary steam to electric electric valve of the

deaerator, open the regulating valve slowly, keep the rate of temperature rise rate of deaerator lower than 1.5℃/min. Warm Warm and deoxidize the water in the deaerator water tank. 6.6.2.7

Heat the water water in the deaerator deaerator according to water injection requirements of boiler, keep metal

temperature difference between injection water and inner surface of the drum within 90 ℃. So the temperature difference difference of inner and outer, up and down s urface of the boiler drum can be within the specified value. 6.6.2.8

After condensate condensate system promoted by machine unit is put into operation, use water level level regulating

valve of deaerator to control the deaerator water level. 6.6.2.9

When feed pump pump is started, the deaerator deaerator water level is normal and that that flow rate of the the water is

constructed, put automatic water level regulation of the deaerator into operation as needed. Steam Turbine Operation Manual Page 144 of 197


6.6.2.10

The deaerator deaerator pressure is controlled around 0.15MPa 0.15MPa during the machine unit is started started and water water

feeding in boiler, the deaerator shall be kept operating in fixed pressure. 6.6.2.11

When machine unit is in normal operation status, turn turn exhaust steam starting of the deaerator to

normal continuous exhaust steam valve, regulate exhaust oxygen valve open level basing on oxygen content in feed water. 6.6.2.12

After pressure of four-section four-section steam steam extraction reaches reaches 0.15MPa with increasing increasing load of the

machine unit, steam source of the deaerator backs to four-section steam extraction from auxiliary steam, the deaerator operates changes from fixed pressure operation to sliding pressure operation. 6.6.2.13

When the quality of steam and water water is qualified during sliding pressure operation, start start continuous

exhaust steam valve to isolation valve of the deaerator, deaerator, plunge continuous exhaust steam valve to operation of the deaerator. 6.6.3 6.6.3.1

Normal operation maintenance of the deaerator People should monitor that the deaerator deaerator pressure <0.996MPa and temperature ≯354.8℃ during

the normal operation of the deaerator. Corresponding with machine unit operation status at that time, the sliding pressure ranges from 0.296 MPa to 0.996MPa. 6.6.3.2

Water level gauge gauge on the ground of the deaerator shall shall be proofread regularly regularly and kept the same same

value with water level indicated value on DCS. 6.6.3.3

Water level control of the deaerator shall be put to automatic automatic operation to keep the deaerator

operating in normal water level. 6.6.3.4

When auxiliary steam is backup steam source during the deaerator deaerator operates normal, open all valves

from auxiliary steam to pressure regulating valve and manual isolation valve. The drain valve before the door shall be opened slightly and the pressure regulating valve shall be put to automatic operation. 6.6.3.5

Dissolved oxygen oxygen in normal deaerator deaerator operation operation shall meet the requirement ( ≤7PPB mg/L). regulate

open level of continuous exhaust valves in normal operating basing on changes of oxygen content in feed water. 6.6.3.6

Outlet water temperature of the deaerator ≤177℃

6.6.3.7

Operating value of safety safety valve of the deaerator is 1.12MPa 1.12MPa

6.6.4 6.6.4.1

Shutdown of the deaerator When normal load decreasing decreasing or the machine machine unit is shutdown, the deaerator is in shutdown mode mode

of sliding pressure and the sliding pressure ranges from 0.296 MPa to 0.996MPa 6.6.4.2

With load decreasing decreasing of the machine unit, pressure pressure of four-section steam extraction extraction reaches

0.15MPa, steam source of the deaerator back to auxiliary steam from four-section steam extraction. 6.6.4.3

With load decreasing of the machine unit, the automatic water level level regulation shall be normal,

otherwise turn it to manual regulation. Steam Turbine Operation Manual Page 145 of 197


6.6.4.4

When the machine machine unit is shutdown, whether whether feeding water water to the deaerator deaerator or not depends on

specific situation. 6.6.4.5

Close continuous exhaust exhaust steam valve valve of the boiler, boiler, expanding device to isolation of the deaerator. deaerator.

6.6.4.6

If the deaerator deaerator has been shut down over a week, week, it shall adapt nitrogen nitrogen filled protection, which which

means cutting off every steam source and water source, draining off residual water in water tank and closing drain valve. After the deaerator has been isolated completely, open nitrogen filled protection valve and isolation valve, fill nitrogen in the deaerator and to keep it in pressure. 6.7

Start and stop of electric feed pump Electric feed pump supplies water to boiler continuously and supplies attemperating water to boiler

superheater, reheater and HP bypass of steam turbine when the machine unit is activated or the main feed pump is under maintenance maintenance or accident. 6.7.1

Inspection before startup

6.7.1.1

When every interlock protection experiment of electric electric feed pump pump is qualified, every interlock

protection and relating measure measure detecting of watt-hour meter shall shall be put into use. 6.7.1.2

Inspect closed cooling water operates normal.

6.7.1.3

When tank oil level of the electric electric feed pump is inspected inspected to be normal, the oil system is qualified to

be put into operation. 6.7.1.4

Start the auxiliary oil pump pump of the electric electric feed pump and and inspect oil system system of electric feed pump

operates normal. 6.7.1.5

Regulate oil cooler outlet valve of the electric feed pump to maintain oil temperature between between 36℃

and 54℃. 6.7.1.6

Inspect and close feed pumps and each of its water drain vain of systematic systematic pipeline.

6.7.1.7

Inspect water water tank level of the deaerator is normal, water quality is qualified, water temperature temperature

meets water feeding requirement of boiler, open the booster pump entrance valve of electric feed pump slightly, slightly, feed water to booster pump and evacuate air from it. When it is done, open the inlet door. 6.7.1.8

Close electric electric door at the outlet valve valve of the electric electric feed feed pump.

6.7.1.9

Open the front and and back valves valves of the minimum flow flow rate of electric feed pump and make sure

circulating valve is open. 6.7.1.10

Open closed inlet water valve of mechanical mechanical sealed sealed cooler of the electric feed pump, open outlet

valve after injecting water and evacuating air. 6.7.1.11

Open inlet and outlet valves valves of mechanical mechanical sealed sealed water magnetic magnetic filter of the electric electric feed pump pump

and close the bypass valve. 6.7.1.12

Feed water in booster pump of mechanical sealed electric electric feed pump. pump.

6.7.1.13

Inspect actuator power of electric feed pump pump and scoop tube is normal. normal.



6.7.1.14 6.7.2

he electric electric feed pump supplies electricity to motor. motor.

Start the electric feed pump

6.7.2.1

Make sure sure the electric feed pump meets meets every start permission permission conditions.

(1) The temperature of electric feed pump is normal; (2) Recirculating regulating valve of the electric feed pump is open; (3) The lubricating oil pressure is not low; (4) The outlet valve of the electric feed pump is closed; (5) The inlet valve of booster pump of the electric feed pump is open; (6) The water level of the deaerator is not low; (7) Scoop tube of the electric feed pump is at the minimum position. 6.7.2.2

Make sure sure the electric door of the electric electric feed feed pump outlet is closed.

6.7.2.3

Set the scoop tube position of the electric electric feed feed pump at position 0%.

6.7.2.4

Start electric electric feed pump, inspect inspect generator cooling water water is fed. If the current does not return return to

normal after starting the electric feed pump for 10s, the electric feed pump shall be stopped at once. 6.7.2.5

Inspect each each bearing whose oil inlet, inlet, return oil temperature, vibration, sound, differential pressure of

strainer etc. are normal. 6.7.2.6

Open outlet door of the electric electric feed pump, pump, regulate scoop tube of the electric electric feed pump to

essential position for feed water to water supply pipeline and evacuate air from water supply pipeline. 6.7.2.7

When the lubricating lubricating oil pressure pressure of the electric feed feed pump is over 0.22MPa, interlock interlock shutdown of

auxiliary oil pump of the electric feed pump is normal. 6.7.2.8

After the pump pump operates normal, normal, pay attention attention to the temperature temperature changing of the sealed water water of the

electric feed pump and regulate cooling water of oil cooler in time to keep lubricating oil temperature between 36℃ and 70℃. 6.7.2.9

Make sure the lubricating oil pressure and working working oil pressure of the electric electric feed pump pump is normal.

6.7.2.10 6.7.3

Open inter-stage inter-stage extraction valve as needed.

Stop of electric feed pump

6.7.3.1

Inspect and verify verify the minimum flow rate valve valve is in place of “automation”.

6.7.3.2

Close scoop tube of the electric electric feed pump gradually and pay attention attention that the minimum minimum flow rate

valve shall be open normal. 6.7.3.3

When lubricating lubricating oil pressure pressure of the electric feed feed pump is lower than 0.15MPa, combined combined starting of

auxiliary oil pump of the electric feed pump is normal. 6.7.3.4

Continue to close close the coop tube of the electric feed feed pump pump until it was closed completely. completely.

6.7.3.5

Close inter-stage inter-stage extraction valve of the electric feed pump pump

6.7.3.6

Stop the electric electric feed pump and close electric door at the outlet valve of the electric feed feed pump. Steam Turbine Operation Manual Page 147 of 197


6.7.4

Additional rules of the electric feed pump

6.7.4.1

All AC/ DC power of the electric feed pump shall shall be supplied supplied (actuator power of electric feed feed pump

and scoop tube) 6.7.4.2

The tank oil level of the electric electric feed feed pump is normal and oil quality is qualified.

6.7.4.3

The electric feed pump is put into “standby” status.

6.7.4.4

When auxiliary auxiliary lubricating oil pump of the electric electric feed pump pump operates continually, continually, oil pressure, pressure, oil

temperature and oil flow in bearing are normal. 6.7.4.5

The booster pump entrance entrance valve valve of electric feed pump pump is completely completely open. open.

6.7.4.6

Scoop tube position of the electric feed pump is on position “0”.

6.7.4.7

The electric electric door of electric electric feed feed pump shall be completely open.

6.7.4.8

Front and back isolation valves valves of the minimum flow rate rate valve of the electric electric feed pump pump shall be

opened completely and the minimum flow rate valve shall be put into “automation” position and kept it completely open. 6.7.4.9

Manual isolation valves of inter-stage extraction of the electric electric feed pump are completely open.

6.7.4.10

All interlock protection of the electric feed feed pump shall be put into operation, operation, each measure measure

detecting of watt-hour meter, transmitter and other devices shall be in operation status. 6.7.5 6.7.5.1

Operation maintenance of the electric feed pump Entrance and and exit pressure of the electric electric feed pump pump is normal and the current is within specified specified

value 681A. 6.7.5.2

The tank oil level level of the electric feed pump is normal and oil quality is qualified. qualified. The lubricating lubricating oil

pressure of the electric feed pump is more than 0.17MPa and oil pressure of lubricating oil filter of the electric feed pump is between 0.25MPa and 0.35MPa. Oil temperature of oil cooler entrance is lower than 65℃, oil temperature of oil cooler exit <55 ℃, oil temperature of working oil cooler entrance is lower than 100℃, oil temperature of working oil cooler exit is lower than 75 ℃. Each bearing return oil temperature is within 65℃. 6.7.5.3

Journal bearing bearing temperature temperature of the electric electric feed pump is lower lower than 80 ℃, thrust bearing temperature

is lower than 90 ℃, bearing temperature of booster pump is lower than 80 ℃, metal temperature of each bearing of the electric feed pump coupler is lower than 90 ℃, temperature of mechanical sealed water is normal and temperature of seal ring is within 80 ℃. 6.7.5.4

The cooling water water of the motor is normal, normal, temperature of the cooling water water is lower lower than 38℃ and

water pressure is lower than 0.16MPa. 6.7.5.5

The pump and motor motor has no abnormal abnormal noise. Vibration Vibration of DE and and opposite DE bearing bearing of the

electric feed pump is less than 7.1 mm/s and it shall not eexcess xcess 11.2 mm/s. 6.7.5.6

The axial axial displacement displacement of the feed feed pump and booster pump is normal.



6.7.5.7

The pump shell shell dose not leak, leak, the oil system system does not leak oil, differential differential filter pressure of the the feed

pump and booster pump is less less than 0.06MPa. 6.8

Start and stop of the steam feed pump unit Each machine unit has been equipped with a 2*50 %B-MCR steam feed pump. When one steam feed

pump is working, make sure the machine unit bears 60%B-MCR water feeding volume. When two steam feed pumps are working, make sure the machine unit bears 100%B-MCR water feeding volume. Steam source of steam turbine of the electric feed pump has cold reheat (HP steam) and four-section steam extraction (LP steam). When switch LP steam to HP steam, the load range ≤40% and regulate auxiliary steam source. Sealed cooling water is closed cooling water; the supply mode of gland sealing steam is header of gland sealing steam and is equipped with desuperheater; share shaft seal cooler with main engine. 6.8.1

Drain off the small steam turbine drain to drain water system system of the main main engine, the small small steam

turbine exhaust steam direct to condenser of the main engine. 6.8.2

Essential conditions before the steam feed pump starts.

6.8.2.1

Small steam turbine is switch out.

6.8.2.2

MHE power control and other power power of the system have been put into operation.

6.8.2.3

Open compressed air source valve

6.8.2.4

The steam parameter conforms to requirement.

6.8.2.5

Preparation of the machine part is on checking checking card of valve. valve.

6.8.3 6.8.3.1

Start lubricant system After confirming confirming the lubricant system meets starting starting condition, start lampblack lampblack presser. presser. Make sure sure

everything is normal. 6.8.3.2

Make sure #1 and #2 lubricating oil pump and and emergency emergency oil pump meet starting condition.

6.8.3.3

Supply power of the emergency emergency oil pump, plunge plunge interlock switch switch of the emergency emergency oil pump, pump,

check the emergency oil pump self-starting, in-situ inspect the emergency oil pump operates normal, stop the emergency oil pump. 6.8.3.4

Supply power of the #1 lubricating lubricating oil pump, plunge interlock of #1 lubricating lubricating oil pump, #1 #1

lubricating oil pump self-starting and inspect #1 lubricating oil pump operates normal. 6.8.3.5

Supply power to #2 lubricating oil pump, pump, plunge interlock of #1 lubricating oil pump, open

experimental electromagnet electromagnet of #1 lubricating oil pump, inspect low outlet pressure alarm of #1 lubricating oil pump and #2 lubricating oil pump pump self-starting operates operates normal. 6.8.3.6

Stop #1 lubricating oil pump operating, operating, plunge interlock, interlock, test #2 lubricating oil pump self-starting

operates normal by using the above methods. 6.8.3.7

Plunge interlock of emergency emergency oil pump pump and using the above methods to inspect emergency emergency oil

pump linkage normal. Steam Turbine Operation Manual Page 149 of 197


6.8.3.8

Whether to fill fill in oil or not bases bases on tank oil level level and whether to put oil cooler into operation or not not

bases on oil temperature. temperature. 6.8.4

Put HP oil control system into operation

6.8.4.1

Put fire resistant oil system of the main engine into operation operation and it shall operate operate normal. normal.

6.8.4.2

Make sure the HP accumulator of small turbine fire resistant oil operates normal. normal.

6.8.4.3

Open entrance entrance of small turbine supplied by anti-fuel oil of the main engine, open oil return return valve of

anti-fuel oil of the small turbine and inspect leakage of system. 6.8.5

Put shaft seal system into operation, operation, open exhaust exhaust valve of the small turbine and construct construct vacuum in

the small turbine. 6.8.5.1

Inspect and open #1 and #2 inlet steam isolation of small small turbine shaft seal, open counter steam

valve of shaft seal, open front and back isolation valves of LP attemperating water regulation door of shaft seal supplied low pressure of the small turbine, close bypass valve of attemperating water. water. 6.8.5.2

Slightly open inlet steam isolation valves of shaft seal seal of small turbine, inspect air proving pipe of

the shaft seal drain water fluently, fluently, shaft seal of small turbine feed air to heating pipe. Regulate steam pressure of the shaft seal around to 0.003-0.01MPa and the temperature of shaft seal is 150 ℃. 6.8.5.3

When the shaft shaft seal start to supply steam, open exhaust steam dish valve valve of the small turbine turbine and

maintain high quality vacuum. 6.8.6

Drain valve of small turbine

6.8.6.1

Make sure all the following following drain valves valves are open and it shall shall be closed until the main engine load

reaches 40% of its rated load during the small turbine starts. (1) Front drain valve of HP main steam valve (2) Back drain valve of HP main steam valve (3) Front drain valve of LP main steam valve (4) Back drain valve of LP main steam valve (5) Main manual valve of the small turbine proper water drain 6.8.6.2

During engine is stop, main engine load decrease decrease to 25% of its rated rated figure, reopen reopen all of above

valves. 6.8.6.3 6.8.7

Open drain drain valves valves immediately when the small steam turbine trips. Start of booster pump

Make sure the start-up conditions of booster pump meets the following: recirculating valves of feed pumps are open, temperature of booster pump is normal, entrance door of booster bump is open, electric exit valve of steam pump is closed, water tank level of the deaerator is normal and water feeding in booster pump is done. 6.8.8

Start of the small steam turbine



The small steam turbine shall meets the following conditions before its impulse starting 6.8.8.1

Make sure rotor vibration, vibration, axial displacement, rotating speed and other monitors monitors of the small turbine

are well-equipped and put into operation. 6.8.8.2

EH oil system system shall be used and the normal oil pressure is between 12.2MPa 12.2MPa and 14.8MPa.

6.8.8.3

Close HP and LP LP main main steam valves and regulation regulation valves.

6.8.8.4

The shaft seal system is put into operation,

6.8.8.5

Make sure each tamp tamp trap and exhaust steam steam valve of the small small turbine are all open.

6.8.8.6

Lubricating pressure and oil temperature are normal.

6.8.8.7

Water level of feed tank is normal.

6.8.8.8

All recirculating recirculating valves of feed pumps and regulation valve valve are put into operation. operation.

6.8.8.9

Sealed water and its cooling water valve valve of the pump pump are open and the water flows smoothly. smoothly.

6.8.8.10

Make sure all protection of the booster pump, small turbine and steam pump are put into operation.

6.8.8.11

Heating pipe of the small turbine. Open Open front-back water drain valves valves of the electric valve of small

turbine LP steam source supplied by auxiliary steam, slightly open the electric valve of small turbine LP steam source supplied by auxiliary steam, close the drain valve when there is steam, completely open the electric valve of small turbine LP steam source supplied by auxiliary steam and pay attention to vibration of the pipe when heating it. 6.8.8.12

Impulse starting parameter

Steam pressure: 0.6~1.3MPa. Steam temperature: having superheat over 50 ℃. 6.8.9

Impulse starting of small turbine

6.8.9.1

Press the latch button, latch the machine unit.

6.8.9.2

Press “open HP main steam valve” and “open LP main steam valve” button, open HP/LP main

steam valve. 6.8.9.3

“Target “Target rotating speed” is set as 800r/min.

“Speed” is set as a s 200r/min/min(Cold start-up: start-up: down time ≥72h ) 300r/min/min (Warm (Warm start-up: down time 72~12h) 400r/min/min (Hot start-up: down time<12h) 6.8.9.4

Press “process” button, open LP regulation valve gradually and the machine unit increases rotating

speed as given rising rate. 6.8.9.5

Increase speed to 800r/min and check

6.8.9.6

Warm the engine for 15min in this speed. Inspect Inspect the machine unit thoroughly. thoroughly. Mainly inspect

whether the dynamic-static part has friction, the vibration is accessed and axial displacement etc. 6.8.9.7

“Target rotating rotatin g speed” choice

Speed of 1800r/min Steam Turbine Operation Manual Page 151 of 197


“Speed” choice

Rising rate of 200r/min/min (Cold start-up) start-up)

Rising rate of 300r/min/min(Warm 300r/min/min(Warm start-up) Press “process” button, increase rotating speed to target rotating speed figure. Warm the engine for 45min in this speed and inspect the machine unit thoroughly. 6.8.9.8

“Target rotating rotatin g speed” choice

“Speed” choice

Speed of 3000r/min

Rising rate of 500r/min/min (Cold start-up) start-up)

Rising rate of 800r/min/min(Warm 800r/min/min(Warm start-up) Press “process” button, increase rotating speed to target rotating speed figure. 6.8.9.9

Operate high-speed high-speed engine warming in this speed for 45min when small turbine is started in cold

start-up mode in speed of 3100r/min. Operate high-speed engine warming in this speed for 15min when the engine is in warm start-up mode. Notes: Critical speed computation value of the first-order is 2545 r/min, Critical speed computation value of the second-order is 11721 r/min. stable operate in rotating speed of 1800 r/min, each working part shall be inspected whether to be normal. Make sure all monitors and control instruments are put into operation. Cross the critical speed rapidly when everything works normal. “Button” mentioned above is on DCS screen. 6.8.9.10

When the actual rotating speed of steam turbine increases to 3100 r/min r/min and meets boiler

automation control condition, control mode of steam turbine changes from rotating speed automation to boiler automation automatically and placidly through software. Then rotating speed of the steam turbine changes with indicator of water feeding requirement CCS (coordination control system of boiler water feeding). After the boiler is in automation mode, distance order of the controller limits rising rate 1000r/min/min. 6.8.9.11

Open the electric electric exit valve valve of the steam pump, parallel parallel pumps operation (Open the exit valve

when exit pressure of steam pump is close to the pressure of feed protopipe) 6.8.9.12

Open inter-stage inter-stage extraction extraction valve valve of the feed pump as needed.

6.8.9.13

When the load load of main engine engine reaches 40% rated load load figure, close main steam valve, regulation

valve, cylinder and all drain valves on steam pipeline of small s team turbine. 6.8.10

Operation rules of parallel pumps operation operation of the feed pump

6.8.10.1

Electric feed pump pump and and single steam pump operate operate coordinately

(1) Inspect whether steam pump is in boiler automatic control mode, exit pressure of steam pump and electric feed pump is close, front-back pressure difference of exit valves of steam pump is lower than 0.06MPa. (2) Make sure the electric feed pump operates normal, the electric feed pump is in automatic control mode and feed – feed – water water control is in automatic mode. Steam Turbine Operation Manual Page 152 of 197


(3) The load of machine unit is around 180 MW. (4) Open exit door of steam pump, pay attention to entrance flow rate of electric feed pump and (5) Try to maintain flow rate of water feeding stable during parallel pumps operation and pay attention to changes of water level of drum. (6) When load of machine unit drops suddenly, steam pump “automation” shall be changed to “manual operation” immediately in case of its flow rate drops suddenly in status of “automation” and the minimum flow rate valve cannot be opened in time would lead to low entrance flow rate and the protection action 6.8.10.2

parallel pumps operation of two steam pumps

(1) Make sure the second small turbine is starting and its rotating speed is controlled by boiler. (2) Regulate rotating speed of steam pump, front-back pressure difference of exit pressure is lower than 0.06MPa. (3) Open electric exit valve of steam pump, open the inter-stage extraction extraction valve. (4) Make sure the electric feed pump and steam pump works normal, its rotating speed is in automatic mode, water feeding is controlled automatically by boiler. (5) Regulate rotating speed of steam pump. When exit pressure of three pumps are close, decrease the rotating speed of electric feed pump, shutdown electric feed pump, inspect self-starting of auxiliary oil pump of electric feed pump, oil pressure is normal. (6) When two steam pumps works in parallel mode and they both are in “automation” mode and the electric feed pump is standby, if one steam pump trips, turn operating steam pump to manual regulation mode immediately after electric pump being linked or manual started to make sure the regulation speed of small turbine is stable. 6.8.11 6.8.11.1

Shutdown of small turbine Preparation before normal shutdown

(1) Experimental spare main oil pump, emergency oil pump and turning motor all work normal. (2) Make sure main steam pump and regulation valve shall work flexibly and there is no jam fault. 6.8.11.2

Normal shutdown

(1) Start electric feed pump when the main engine load drops to 60% of rated load. One steam pump can be shutdown if water feeding feeding system inspection is is normal. (2) Release steam pump automation, decrease rotating speed of steam pump, increase load of electric feed pump and make sure the steam pump load that is ready to stop has been transferred. (3) Close inter-stage extraction valve of the steam pump ready to stop to electric attemperating water valve of reheater. (4) Close electric exit valve of steam pump, inspect and open the minimum flow rate valve. (5) When the main engine load drops to 25% of rated load, open all drain valves of small turbine Steam Turbine Operation Manual Page 153 of 197


cylinder and steam pipeline. Open pneumatic drain valves in front of HP and LP main steam pumps at the same time. (6) With the decline of main engine load, C CS (coordination control system of boiler water feeding) can decrease the rotating speed of the small steam turbine. Press button “Release” on “MEH operation panel” when the rotating speed of the small steam turbine drops to the minimum 3100r/min of “boiler automation” control mode. (7) Inspect and confirm HP main steam valve, LP main steam valve, HP regulation valve and LP regulation valve of the small turbine are closed and relating indicator is light. (8) Inspect and confirm the electric valve of small turbine HP steam source and electric valve of small turbine HP steam source are closed. (9) The following work shall be done if the small turbine has been stopped for a long time: a. If the main engine continues to operate in load lower than 50% of rated load, the boiler is fed water by electric feed pump, vacuum dish valve on the exhaust steam of the small steam turbine shall be closed speedily to avoid breaking the vacuum of condenser of the main engine. b. When sliding pressure operation declines to load, one steam pump shall be cut off when main engine load is under 40% and the main engine shall operates with one steam pump. (10) Cylinder temperature ≤150℃, lubricant system of small turbine can be s hut down. 6.8.11.3

Emergency shutdown

(1) Strong vibration happens to machine unit, amplitude is beyond shutdown figure but protection device does not act or vibration figure increases rapidly. (2) Clear metal friction noise and impact noise in the steam turbine. (3) Water hammer happens to the steam turbine. (4) Bearing temperature increases rapidly to 113 ℃ or oil inlet of any bearing increases to 75 ℃. (5) Heavy friction or sparkles happen to shaft seal or oil deflector ring. (6) Lubricating pressure of the bearing downs to 0.04MPa, invalidity of start backup oil pump. (7) Oil tank level downs to shutdown figure, oil filling void. (8) Oil system is on fire and cannot be put out immediately. immediately. (9) Axial displacement displacement is beyond the limit, but protection device of the axial displacement does not act. (10) Rotating speed of the steam increases to rotating speed figure of the trip, but the machine unit is not switch out. 6.8.12

Normal maintenance of small turbine

6.8.12.1

Around the steam pump, it is clean clean and there are no sundries. sundries. No leakage leakage of gas, oil or water. water.

6.8.12.2

Oil level of the tank tank is normal. normal. Fill in oil in time if the oil level is below below 550 mm. mm.

6.8.12.3

Normal oil return temperature of the bearing <60℃, alarm ringside if it is beyond 65℃.



6.8.12.4

Control oil pressure, lubricating pressure pressure and and oil temperature to be normal.

6.8.12.5

Test Test bearing and machine body vibration every every day, day, vibration figure shall not beyond 0.05mm. 0.05mm.

6.8.12.6

Regularly inspect the smoke exhauster of oil tank work work normal, keep oil tank of small turbine

vacuum. 6.8.12.7

Inspect strainer pressure difference difference of feed feed pump lubricant indicate normal, pressure difference difference is

lower than 0.06MPa. 6.8.12.8

Inspect pressure pressure of lubricant cooling water of steam turbine of the feed pump as normal as

0.35MPa. 6.8.13

Switch of oil coolers of the small turbine

6.8.13.1

Make sure the two oil coolers’ operation and backup status.

6.8.13.2

Check the backup oil cooler is fine.

6.8.13.3

Slightly open backup oil charge charge valve and outlet nazzle nazzle high spot vent valve of the oil cooler, cooler, fill

oil and vent gas to the oil cooler Close vent valve when there is oil leaks continually from the vent door. 6.8.13.4

Completely open oil charge charge valve of the oil cooler, cooler, boost pressure pressure to backup oil cooler, observe observe

leakage situation. 6.8.13.5

Open inlet and outlet valves of cooling water of the backup oil cooler. cooler.

6.8.13.6

Turn switching switching handles of oil cooler for a while, observe observe working status of backup oil oil cooler. cooler.

6.8.13.7

Continue to turn switching handles slowly. slowly. Observe it while turning it. Put oil cooler into operation

gradually until switch it to the th e position of original backup oil cooler. Pay attention to oil temperature change. 6.8.13.8

Close oil charge charge valve of oil cooler, cooler, close inlet and outlet valves valves of the original working oil cooler

gradually and turn them to backup. 6.8.14

Switch of oil strainer of small engine

6.8.14.1

Open oil filling filling valve of backup strainer slowly. slowly.

6.8.14.2

Open vent vent valve valve on top of backup backup strainer strainer slowly. slowly.

6.8.14.3

After venting and oil filling of backup strainer, strainer, close vent valve valve on top of backup strainer, strainer, close oil

charge valve of backup strainer. 6.8.14.4 6.9

Turn and switch handles of strainer slowly, slowly, switch strainer to the original working backup strainer strainer..

Heater putting into operation and shutdown Use once reheat system, set Class III HP heater, Class I deaerator and Class IV LP heater to make up

Class VIII reheat system. The HP, LP heater both use lying U shape tube-type, among which use integrated design for No.7 and No.8 LP heater, and design two No.7, No. 8 LP heaters. There is auto-dewatering from the HP heater to the deaerator step by step, and there is auto-dewatering from the LP heater to the condenser. Each heater has accident drain valve, which discharges to the condenser respectively. respectively. 6.9.1

Principle of heater heater putting into operation and shutdown Steam Turbine Operation Manual Page 155 of 197


6.9.1.1

First operate the water side then the steam side for the heater input; first shut down the steam steam side

then the water side for the heater shutdown. Operate the water side of the LP heater when there is water injection in condensation water system, or operate it normally after the condensation water system has been put into operation properly; operate the water side of the HP heater when there is water filling of the boiler, finish the water injection operation under the condition of low pressure. 6.9.1.2

LP heater heater is started started randomly by sliding during unit impulse starting, HP heater is put into operation

when the unit load reaches 25% and the deaerator is back to the fourth section of this unit for the steam extraction and supplying.

Observe the principle of from from high pressure pressure to low pressure pressure when put the HP

heater into operation, and on the contrary for the shut down it. 6.9.1.3

Strictly prohibit putting leaking heater into operation.

6.9.1.4

Heater is permitted to be put into operation only when its water level indicator indicator is in good condition,

the action of alerting signal and protective device is normal. 6.9.1.5

During the heater putting putting into operation and shutdown shutdown process, strictly control temperature temperature

changing rate of LP heater ≯3℃/min, the temperature changing rate of HP heater outlet water ≯1.85℃/min. 6.9.1.6

During the input, shutdown shutdown process of the heater, heater, pay attention that that if the heater heater step-by-step

auto-dewatering cannot meet the requirement, control the water level of the heater by the emergency drain valve. 6.9.2

HP heater input

6.9.2.1 6.9.2. 1 6.9.2.1.1

Waterside input Electric feed pump and steam pump run properly, properly, the electric valve on the exit of the running feed

pump is open; slightly open the exit valve of the HP heater, inject water to HP heater, heater, control the temperature changing rate of HP heater outlet water ≯1.83℃/min, close it after seeing water in the air discharge valve. 6.9.2.1.2

After water injection, injection, check the water water level indicator indicator of the HP heater, heater, there shall be no water water

level. 6.9.2.1.3

After the pressure of the HP heater water side and the pressure of the feed pump exit are kept kept

balance, open the electric electric valve of the HP heater heater entrance, exit. 6.9.2.1.4 6.9.2.2 6.9.2.2.1

Flush the the HP heater according to the requirement until it is qualified. Steam side input Confirm that the HP HP heater water side has been input normally, normally, the HP heater heater water level interlock interlock

protection test is normal, normal, condenser vacuum is normal. 6.9.2.2.2

When the unit load reaches reaches 30% of the rated load, input input the HP heater steam side in turn according according

the order of #3, #2, #1. 6.9.2.2.3

Check the relevant relevant drain valves valves of the steam extraction pipe, open the steam extraction extraction check

valve of the input HP heater, slightly open the steam extraction electric valve to do the HP heater pre-warm, Steam Turbine Operation Manual Page 156 of 197


pay attention to control the temperature changing rate of the HP pressure outlet water ≯1.83℃/min. Use the water discharge valve of the input HP heater steam side to keep the water level normal. 6.9.2.2.4

After the air inflow of the HP heater, heater, shut the starting air air discharge valve, valve, open the continuous air

discharge valve of the steam side. 6.9.2.2.5

After finishing the pre-warm, gradually open the steam extraction extraction electric valve of the HP heater heater..

6.9.2.2.6

Check #3 HP heater, heater, when the steam side pressure is 0.2~0.3MPa higher than the deaerator

pressure, confirm that both the front and back stop valves of the #3 HP heater normal dewatering adjusting valve are open, slowly shut the water discharge valve of #3 HP heater steam side, pay attention that the action of the #3 HP heater normal dewatering adjusting valve shall be normal. 6.9.2.2.7

Check #2 HP heater, heater, When the steam side pressure pressure is 0.2~0.3MPa higher higher than that of #3 HP heater heater,,

confirm that both the front and back stop valves of the #2 HP heater normal dewatering adjusting valve are open, slowly shut the water discharge valve of #2 HP heater steam side, pay attention that the action of the #2 HP heater normal dewatering adjusting valve shall be normal. 6.9.2.2.8

Check #1 HP heater, heater, When the steam side pressure pressure is 0.2~0.3MPa higher higher than that of #2 HP heater heater,,

confirm that both the front and back stop valves of the #1 HP heater normal dewatering adjusting valve are open, slowly shut the water discharge valve of #1 HP heater steam side, pay attention that the action of the #2 HP1 heater normal dewatering adjusting valve shall be normal. 6.9.2.2.9

After the HP heater steam side is input normally, normally, shut all the drain valves of the relevant relevant steam

extraction pipes. 6.9.2.2.10

During the process of HP heater input, try to keep the unit load steady, steady, pay attention to that that

whether the water level auto-adjusting of the HP heater is normal. 6.9.2.2.11

During the unit unit starting process, process, after the joint of the unit unit (if it is cool starting, after after finishing the the

initial load pre-warming), open I, II, III extraction check valve, slightly open the I, II, III extraction electric valve, do pre-warming for the HP heater, control the dewatering by the emergency drain valve; pay attention to the temperature rise and water level of the HP heater exit. With the load rising, gradually open wide the steam inlet electric valve of the HP heater until it is fully open, then adjust all the water level fixed value of the normal drain adjusting valve to be normal. 6.9.2.3 6.9.2.3.1

The HP heater input during during the unit running Relevant overhaul has been finished, the overhaul site has been cleaned, cleaned, and there is no object object

which will obstruct the starting of this system. 6.9.2.3.2

The inspection and operation operation needed before the system starting starting have been completed. completed.

6.9.2.3.3

Do the water injection , air discharge before before the HP heater water water side input, pay attention to that

the feed water flow of the boiler shall be normal when switch from the bypass to the main road. 6.9.2.3.4

Pay attention to the change of the condenser vacuum vacuum when open the emergency emergency drain manual Steam Turbine Operation Manual Page 157 of 197


valve. 6.9.2.3.5

When the HP HP heater heater steam side input, fully do the pipe warm-up, warm-up, pay attention to control the water water

temperature rise rate of the input heater exit ≯1.83℃/min. The other operations are the same as the normal input of the steam side. 6.9.3

HP heater shutdown

6.9.3.1

Steam side shutdown

6.9.3.1.1

When the load reaches reaches to 30% of the rated load, slowly shut the steam steam extraction electric electric valve

according to the order of #1, 2, 3. 6.9.3.1.2

When the extraction extraction check valve shut automatically automatically,, all the drain valves valves of steam steam extraction pipe pipe

shall open automatically. automatically. 6.9.3.1.3

Shut down the continuous air discharge of the HP heater to the the manual isolation isolation valve of the

deaerator. 6.9.3.2 6.9.3. 2

Waterside shutdown

6.9.3.2.1

After shutting down down the HP heater, heater, shut down the the water side according to the actual situation.

6.9.3.2.2

If the heater heater shall be in outage for a long time, first discharge discharge all the stored water, water, then inject

nitrogen for maintenance. 6.9.3.3

The HP heater shutdown during the unit running running

6.9.3.3.1

When the HP HP heater heater is shut down, the load of steam turbine shall be reduce to the ruled value.

6.9.3.3.2

Shut HP heater continuous air discharge valve

6.9.3.3.3

Slowly shut steam extraction electric valve, valve, pay attention attention to that the turbine expansion difference, difference,

axial displacement, water level change of HP heater shall all be within the controlled range, the temperature falling rater of heater outlet water ≯1.83℃/min. When the #1 steam side pressure is 0.2~0.3 MPa higher than that of the #2, open the water discharge valve on the steam side of #1 HP heater, shut the stop valves from the drain valve of #1 HP heater to the drain adjusting valve of #2. When the #2 steam side pressure is 0.2~0.3 MPa higher than that of the #3, open the water discharge valve on the steam side of #2 HP heater, shut the stop valves from the drain valve of #2 HP heater to the drain adjusting valve of #3.When the steam side pressure of #3 is 0.2~0.3 MPa higher than the pressure of deaerator, open water discharge valve on the steam side of #3 HP heater, shut the stop valves from #3 drain valve to the deaerator adjusting valve. 6.9.3.3.4

After the steam side is shut down, open the water water side bypass valve, valve, shut entrance and exit valves valves

of HP heater, heater, pay attention to that the feed water flow shall be normal. 6.9.3.3.5

Before open the water water discharge valve valve and air discharge discharge water, water, shut all the emergency emergency drain

manual isolation valves from the HP heater to condenser. condenser. 6.9.3.3.6

Properly do other other isolation measures for the overhaul. overhaul.



6.9.4

LP heater running

6.9.4.1 6.9.4. 1 6.9.4.1.1

Water side input Start condensate condensate water pump, pump, slightly open LP heater water inlet inlet valve, inject water to the LP LP

heaters according the order of #8~#5, when there is water seen in the air discharge valve on the water side, shut air discharge valve, there shall be no water level when there is injection, and there shall be no change of the condensate water flow after the injection 6.9.4.1.2

Fully open the entrance and exit valve valve of the LP LP heater water side, shut the bypass bypass valve.

6.9.4.1.3

Flush the the LP heater according to the requirement requirement until it is qualified.

6.9.4.2 6.9.4.2.1

Steam side input #8A/B~#7A/B #8A/B~#7A/B #8A/B~#7A/B LP heater steam steam side shall be input randomly during the impulse

starting of the steam turbine. 6.9.4.2.2

After the steam steam turbine vacuum vacuum is established, established, shut down #6, 5 LP heater starting starting air discharge discharge

valves by turn, slowly open LP heater continuous air discharge valve, pay attention to the change of condenser vacuum, if the change is great, shut the valve immediately and check the leak point, after the leak point is removed, input the continuous continuous air discharge. discharge. 6.9.4.2.3

After the unit joint, input steam side according to the order of #5, 6, check the relevant drain

valves of steam extraction pipe shall be open, open the extraction check valve of the input LP heater, slightly open steam extraction electric valve to do the pre-warm, pay attention to control the temperature changing rate of LP heater outlet water ≯2℃/min, maximum ≯3℃/min. Gradually open the LP heater steam extraction electric valve until it is fully open, the action of the normal drain adjusting valves for #5 LP heater to #6 LP heater shall be normal. 6.9.4.2.4

When the unit load load is more than 20%, all the drain valves of the section V, V, VI steam extraction

pipe shall be shut. 6.9.4.2.5

When the unit load permits, immediately immediately switch the #6 LP heater drain valve from emergency

drain valve to normal drain valve. 6.9.4.3 6.9.4.3.1

LP heater input during the unit running The relevant overhaul overhaul is finished, the the work ticket is taken back, the overhaul site is cleaned, and

there is no object which will obstruct the starting of this system. 6.9.4.3.2

Before starting starting the system, the inspection and operation has been completed. completed.

6.9.4.3.3

Fully inject water for the water side input, discharge off the air; during the water injecting injecting of the

water side, keep close watch that there shall be no change of the dewatering water level; when switch from bypass to main road, supervise supervise that the condensate water flow shall shall be normal, avoid water-break. water-break. 6.9.4.3.4

Slowly open the LP heater heater continuous air discharge discharge valve, valve, and keep close watch on the condenser

vacuum, if the vacuum reduced fast, shall shut that valve immediately, and check the heater, continue Steam Turbine Operation Manual Page 159 of 197


operating after confirm that the leak point has been removed. 6.9.4.3.5

Fully warm warm the pipe for the steam steam side input, input, pay attention to control the outlet water temperature temperature

rise rate of the input heater ≯3℃/min. 6.9.4.3.6

After the steam steam side is input normally, normally, check all all the drain valves of steam extraction pipe shall be

shut. 6.9.4.4

LP heater normal shutdown

6.9.4.1.1

LP heater steam side shutdown

6.9.4.1.1.1

There is random slipping shutdown for 1#5, 1#5, 6, 7A/B, 8A/B LP heater. heater.

6.9.4.1.1.2

After the steam steam turbine braking, braking, confirm that steam extraction extraction electric electric valve and extraction

check valve shut automatically, all the drain valves of steam extraction pipe shall open automatically. 6.9.4.1.2

LP heater water side shutdown

6.9.4.1.2.1

After the shutdown of heater, shut down the water side according to the actual situation.

6.9.4.1.2.2

If the heater heater needs to be in outage for for a long time, shall discharge discharge off the water, water, inject nitrogen

for maintenance. 6.9.4.1.3

LP heater shutdown during unit running

6.9.4.1.3.1

According to the situation of the LP LP shutdown, reduce reduce the steam turbine turbine load to the ruled ruled value.

6.9.4.1.3.2

Slowly shut the steam extraction extraction electric valve, pay attention that the change of the turbine

expansion difference, axial displacement shall be within the controlled range, the temperature falling rate of the heater outlet water ≯3℃/min. 6.9.4.1.3.3

After the extraction extraction check is shut, all the drain valves of steam extraction extraction pipe shall shall open

automatically. 6.9.4.1.3.4

When the steam steam side is shut down, open the bypass valve on the water water side, shut shut the entrance, entrance,

exit valves, pay attention to supervise that the feed water flow shall be normal. 6.9.4.1.3.5

Before opening the water discharge discharge valve and air discharge valve, shut the LP LP heater normal normal

drain manual valve, emergency drain manual valve, continuous air discharge valve and the normal drain manual valve from the upper-level heater to this LP heater. 6.9.4.1.3.6 6.9.5 6.9.5.1

Properly do the other isolation isolation measures measures for the overhaul.

Control the water level of dewatering Normal water level

The normal water level is the designed best water level, and it is shown clearly on the general drawing and water level indicator board. And the best water level in thermal state shall be determined by adjusting during the running. When the heater reaches to the running state and runs steadily, try best to keep the normal water level, generally it is the drain adjusting valve that controls the water level. In order to make it convenient for the Steam Turbine Operation Manual Page 160 of 197


operating personnel to observe, water level indicator is connected on the shell. Generally, Generally, the permitted water level deviation is 38mm upper or lower than the normal water level. 6.9.5.2

Low water level

38 mm lower than the water level (0mm for vertical type), when it is lower than this water level. for the heater which has dewatering cooling section, the inlet of dewatering cooling section will break the surface of water, water, and let the steam flow into this section, this will result in breakdown by destroying the normal work of this section (1) Cause the gaining of drain approach; (2) Because of leakage, the loss of steam latent heat, the property of heater deteriorates (3) Create erosive damage to the entrance of dewatering cooling section and the entire section, which will break the pipe, in order to make sure whether there is air leakage, compare the temperature of the dewatering outlet and feed water inlet. According to the designed working state, when it runs normally, the temperature of dewatering is about 5.5~11 ℃ higher than that of feed water inlet, if the temperature of dewatering is 11~27.5℃ higher than that of feed water inlet, then there may be partial water inflow and air leakage in the dewatering cooling section. 6.9.5.3

High water level

38mm (50mm for vertical type) higher than the normal water level is high water level, when it is higher than this level, there will be heat transfer pipe inundating in water, which reduces the available limited heat transfer section and declines the heater property (lower the feed water outlet temperature). High level is caused by the following situations: (1) Drain adjusting valve cannot work properly or has fault; (2) The pressure difference difference of the heater valves, which water step by step, is not enough; (3) Overload; (4) Pipe damage. If the pipe leaks, take measures immediately, bloc the broken pipe, which is to avoid the erosive damage to the neighboring pipes caused by high pressure water. water. 6.10

Input and breakdown of main engine shaft gland system Running of adjusting valve in each control station is interlocked under the pressure of different gland

sealing protopipe Pressure of gland sealing protopipe MPa(a) MPa(a)

HP steam supply valve

Auxiliary steam

Cold reheat steam

supply valve

supply valve

Overflow valve

0.0207MPa

Start and control

ON

ON

OFF

0.0241MPa

OFF

Start and control

ON

OFF

0.0276MPa

OFF

OFF

Start and control

OFF

0.0310MPa

OFF

OFF

OFF

Start and control



6.10.1

Input conditions of steam turbine shaft gland system

6.10.1.1

Steam temperature in the auxiliary steam supply header >300℃, pressure 0.8~1.2 MPa.

6.10.1.2

Shut the electric valve, valve, adjusting valve, bypass valve of the shaft seal steam source supplied by the

main steam. 6.10.1.3

Shut the electric valve, valve, adjusting valve, bypass valve of the shaft seal steam source supplied by the

cold reheat steam. 6.10.1.4

Input steam turbine jigger, it works works properly. properly.

6.10.1.5

Input water circulation system.

6.10.1.6

Input condensate water system,

6.10.1.7

Shut the overflow valve of the shaft seal steam source protopipe. protopipe.

6.10.2

Preparation before the shaft seal system input

6.10.2.1

Confirm that the relevant interlocking and protection are are normal normal by checking.

6.10.2.2

Confirm that input of condensate water water system is normal, and the jigger of main engine has been been

input. 6.10.2.3

Unit is started normally, normally, input shaft seal system system to main engine and steam turbine of feed water

pump at the same time. time. 6.10.2.4 6.10.3

Finish the operation of shaft seal seal system according to the system checking card. Input the shaft seal system

6.10.3.1

Before starting starting the vacuum vacuum pump, input the steam steam turbine shaft seal for steam supplying.

6.10.3.2

Confirm that each drain valve of shaft seal is open, slowly slowly open the manual isolation valves from from

auxiliary steam to shaft seal steam, do the pipe warm-up, pay attention that there shall be no phenomenon of vibration in pipes of shaft seal s ystem. 6.10.3.3

Open the water seal seal water injection injection valve and air discharge discharge valve of the shaft seal heater, heater, inject

water with U shape to the shaft seal heater, slightly open the bypass valve of shaft seal steam resource supplied by auxiliary steam. 6.10.3.4

Start the fan of a shaft shaft seal heater, heater, check whether the pressure taken taken by steam side of shaft seal seal

heater is normal, fan of shaft seal heater runs steadily, all is normal, including sound, temperature, vibration, etc., input the other one for standby application. 6.10.3.5

Fully open the shaft shaft seal auxiliary steam inlet electric electric valve, shaft shaft seal steam source adjusting

valve supplied by auxiliary steam will input automatically, shut bypass electric valve of the assistant supplying shaft seal steam source. Check whether the action of the assistant supplying supp lying shaft seal steam source adjusting valve is normal. 6.10.3.6

Open the front front and back back isolation valves of the LP shaft seal seal steam temperature temperature control control valve, shaft shaft

seal steam temperature control valve input automatically, set the temperature at 149 ℃, check whether the Steam Turbine Operation Manual Page 162 of 197


auto-adjustment of the shaft seal steam attemperation water adjusting valve is normal. 6.10.3.7

Monitor the pressure of shaft seal steam supplement, temperature of shaft seal steam, strictly

monitor the change of the unit expansion difference and the running state of the jigger. jigger. 6.10.3.8

Input shaft seal to small small steam turbine at the same time, open the shaft seal steam supplement supplement stop

valve of the small steam turbine, pay attention that the pressure and temperature of the shaft seal steam shall be normal. 6.10.3.9

When the load of main engine reaches to 25%, 25%, open the isolation valves on the two side of the cold

reheat steam supplement valve in time, and pay attention that switch the shaft seal steam source to cold reheat. When the load continue rising to more than 70%, totally switch the shaft seal system to self-seals. 6.10.4

Shutdown of shaft seal system

6.10.4.1

Check and confirm that that the vacuum vacuum of condenser completely completely disappears, disappears, permit to shut down shaft

seal. 6.10.4.2

Remove standby fan of shaft seal heater, heater, shut down the fan of shaft seal heater. heater.

6.10.4.3

After shut down the fan of shaft seal cooler, cooler, shut the steam seal pressure adjusting adjusting valve and the

manual shut valve on the two sides s ides according to the following order. 6.10.4.3.1

HP steam supplement valve

6.10.4.3.2

Auxiliary steam supplement valve

6.10.4.3.3

Cold reheat steam supplement valve

6.10.4.3.4

Overflow valve

6.10.4.4

Shut attemperation attemperation water control control valve of the LP cylinder and the isolation valves valves on the two sides

from main steam to attemperation water control valve of the LP cylinder. cylinder. 6.10.4.5 6.10.5

Shut the water injection valve valve of the shaft seal heater heater water water seal. Operation & maintenance

6.10.5.1 6.10.5.1.1

Running monitoring When the load load of unit is over than 70%, shaft seal system reaches self-seals, overflow overflow valve

controls the shaft seal steam supplement pressure at 0.031MPa. 6.10.5.1.2

Temperature of the LP shaft seal steam steam is generally kept between 121~177℃, when the

temperature of shaft seal steam exceeds 149 ℃, the LP shaft seal steam supplement attemperation water input automatically. 6.10.5.1.3 6.10.5 .1.3

In steam seal area of the HP, HP, IP steam turbine, the temperature difference between the steam and

rotor metal shall not exceed 110 ℃. 6.10.5.1.4

Pay attention attention that if the vacuum of the shaft shaft seal cooler cooler is about 50.8~76.2mmH2O, the shaft seal

water level auto-adjusting is normal. 6.10.5.1.5

After inputting the shaft seal steam, shall pay attention to the important parameters, parameters, such as Steam Turbine Operation Manual Page 163 of 197


temperature difference and expansion difference between the upper and lower cylinder, etc., check whether there is bubbling in the shaft seal place and whether the sound id normal. 6.10.5.1.6

The steam supplied to the steam turbine shaft seal seal must be the overheating steam, steam, and the

overheating degree shall not be less than 14 ℃. 6.10.5.1.7

When reducing the load normally, normally, if the cold reheat pressure can keep keep the shaft seal seal steam

supplement protopipe pressure over than 0.0241MPa, the steam supplement volume of the shaft seal system can get from the cold reheat pipe of the main engine. If the protopipe pressure fall to below 0.0241MPa, assistant adjusting valve shall be open to keep the pressure of protopipe at 0.0241MPa. 6.10.5.1.8

Try to adjust the branch pipes temperature temperature of each LP shaft seal system system between 120~130 ℃,

when it is lower than 100℃, shall do the air discharge work of the corresponding LP shaft seal pipe in time. 6.10.5.2

The rules of the temperature temperature and pressure when the unit needs to start the shaft seal:

6.10.5.2.1

HP shaft shaft seal steam supplement supplement is used for the steam turbine starting starting after tripping and load

shedding or used when the low load cold reheat section doesn’t supply steam. Thus, adjust the lowest pressure of HP steam supplement valve intelligent positioner to be 0.0207MPa(a) , and adjust the pressure of auxiliary steam supplement valve and cold reheat steam supplement valve to be 0.00345MPa(a) higher. 6.10.5.2.2

When the unit is started in any state, temperature temperature of LP shaft seal steam steam is normally kept between

121~177℃, anytime the LP shaft seal temperature shall not be lower than 121 ℃. 6.10.5.2.3

Temperature Temperature and and pressure reduction of the HP steam supplement from the main steam, steam, configure

two tandem pressure reduction valves, the first one controls the pressure at about 5.0MPa, then control the pressure within the designed range by the second one, then reduce the temperature to 350~400 ℃ by the HP desuperheater. In order to prevent the negative influence on the steam seal system, which is brought by the high temperature and high pressure steam, when there is no need of HP steam supplement, shall cut off the source of the main steam by the electric stop valve. 6.11

Putting into operation and shutdown of vacuum system

6.11.1

Preparation before vacuum system is put into operation operation

6.11.1.1

Take Take full inspection to to the vacuum pump and vacuum system to ensure that they conform to the

condition of putting into operation. 6.11.1.2

Power delivery of vacuum pump.

6.11.1.3

Check and make sure that all air release valves valves and water discharge valves are are closed and relevant relevant

meters are put into operation. 6.11.1.4

Confirm that that manual isolating isolating valves from condenser to all vacuum pump pump inlets are opened.

6.11.1.5

Check and and make sure that vacuum pump inlet valve is closed.

6.11.1.6

Confirm that condensate system and open circulation circulation cooling water system have been been put into

operation. Steam Turbine Operation Manual Page 164 of 197


6.11.1.7

Open the manual manual isolating valve valve of steam steam separator connecting connecting condensation condensation water and vacuum

pump to fill water and pay attention that the automatic water feeding valve valve is in normal motion. 6.11.1.8

Put cooling water in vacuum pump cooler. cooler.

6.11.1.9

Close the vacuum breaker valve of condenser condenser..

6.11.1.10

Open the main main sealing water water gate of vacuum breaker valve, valve, regulate all branch gates to maintain maintain

certain sealing water level without overflow. 6.11.1.11

For the initial start start of establishing vacuum, two two sets of vacuum pumps shall shall be started

simultaneously; for maintaining vacuum, one pump shall operate and one for standby. 6.11.2 6.11.2.1

Start of vacuum pump Start the first first set vacuum. When When the pressure pressure difference difference of vacuum vacuum pump inlet is -4.5kPa, -4.5kPa, the

pneumatic valve of vacuum pump inlet will open automatically automatically.. 6.11.2.2

Confirm that vacuum indication indication of vacuum vacuum pump inlet and exhaust exhaust of steam steam separator separator are normal.

6.11.2.3

Start the second set vacuum vacuum pump. When the pressure pressure difference difference of vacuum pump inlet is -4.5kPa, -4.5kPa,

the pneumatic valve of vacuum pump inlet will open automatically. automatically. 6.11.2.4 6.11.3 6.11.3.1

Confirm that vacuum indication indication of vacuum vacuum pump inlet and exhaust exhaust of steam steam separator separator are normal. Operating maintenance of vacuum pump Check whether pump vibration vibration is normal without friction and abnormal sound; motor current current is

normal. 6.11.3.2

Check the leakage condition of pump packing box.

6.11.3.3

Check the water level of vacuum vacuum pump steam separator separator and make sure sure that the temperature temperature of

working water is normal. 6.11.3.4

Check and make make sure that the sealing water water level of vacuum breaker breaker valve of condenser is is normal.

6.11.3.5

Check and and make sure that vacuum pump cooler is working normally. normally.

6.11.4

Shutdown of vacuum pump

6.11.4.1

Relieve the “standby” of standby vacuum pump and stop operating the vacuum pump.

6.11.4.2

Confirm that the vacuum pump inlet is closed.

6.11.4.3

If it is fault or pumping termination termination defect, defect, isolate the pump.

6.11.5 6.11.5.1

Switchover of vacuum pump Take Take full inspection of the standby standby vacuum pump and make sure that it is is in good condition condition and

ready for start. 6.11.5.2

Relieve the “standby” of standby vacuum pump.

6.11.5.3

Start standby vacuum pump. Check and make make sure that the current and and sound are normal, DCS

status indication is correct. 6.11.5.4

Check and confirm confirm that when the inlet pressure difference is -4.5kPa after the start of standby Steam Turbine Operation Manual Page 165 of 197


pump, the inlet valve shall shall open in linkage, or else, contact contact thermotechnical thermotechnical personnel for handling. 6.11.5.5

After the complete inspection, inspection, stop a set vacuum pump that is operating to check whether whether the DCS DCS

status indication is correct and whether all valves are closed correctively on the site. 6.11.5.6

Check and make make sure that condenser vacuum is normal; put the unused vacuum pump into

“standby” as needed. 6.12

Putting into operation and and shutdown shutdown of main engine engine lubricating lubricating oil system Steam turbine lubricating oil system is composed of main oil pump, AC lubricating oil pump, DC

accident oil pump, high pressure standby seal oil pump, jacking oil pump, barring gear, oil cooler, purging system, main oil tank, oil ejector, oil purifier, etc. Lubricating oil system oil return pipe shall adopt suit pipeline. The main oil pump for steam turbine turbine spindle drive is volute centrifugal centrifugal pump. For normal operating, operating, main oil pump outlet pipe will supply oil to oil ejector, machinery overspeed trip and hand trip header pipe, high pressure seal standby oil pipe. Ejector outlet supplies oil to main oil pipe inlet, lubricating oil system and low pressure seal standby oil pipe. During start and stop of unit, AC lubricating oil pump will supply oil to lubricating oil system through oil cooler. This system is set up with two sets of oil coolers, one for normal operation and one for standby, which can be switched over by three-way valve. The system is set up with self-starting test device, which links AC and DC lubricating oil pump when the oil pressure of lubricating oil system is low; it has low oil pressure test device, which links steam turbine when the oil pressure of lubricating oil system is low. low. 6.12.1

Conditions for system’s putting into operation

6.12.1.1

All interlock protection tests tests of system system equipment have been finished and up to standard. standard.

6.12.1.2

Main oil tank tank has been been filled with appropriate appropriate qualified oil (Oil level level shall be 500mm).

6.12.1.3

All oil outlet valves and water discharge discharge valves valves of system have been closed.

6.12.1.4

Corresponding oil coolers have been put into operation. operation.

6.12.2 6.12.2.1

Preliminary operation of equipment equipment and leak detection of system system Start the smoke exhaust exhaust fan of main oil tank and check whether whether the vibration and sound sound are

normal. 6.12.2.2

Check whether lubricating oil oil temperature temperature is normal. normal. Check that that oil sealing sealing has been been finished.

6.12.2.3

Close the isolating isolating valve from lubricating lubricating oil, high pressure pressure standby oil to sealing oil; start AC

lubricating oil pump to check whether the vibration, sound and pressure are normal. 6.12.2.4

Check whether lubricating oil system is leaking. leaking.

6.12.2.5

Stop AC lubricating lubricating oil pump pump and start DC accident oil pump; start hydrogen hydrogen seal oil pump pump to

check and make sure that the vibration, sound and pressure are normal, then stop DC accident oil pump and hydrogen seal oil pump for standby. standby. 6.12.2.6

Check and make make sure that all pressure meters meters and thermometers thermometers of system indicate correctly. correctly.



6.12.2.7

Take Take oil cooler switchover switchover test to confirm that that oil pressure does does not fluctuate during switchover. switchover.

6.12.2.8

Start all jacking jacking oil pumps one by one. Check and make make sure that the vibration, vibration, sound, outlet

pressure, all jacking oil pressures pressures are normal. normal. 6.12.2.9

Check and and make sure that jacking oil device is is free of oil leakage.

6.12.2.10

Shutdown of jacking oil pump

6.12.2.11

Shut down down the smoke exhaust exhaust fan of main oil tank.

6.12.3 6.12.3.1

Putting into operation of lubricating oil system Before lubricating lubricating oil system is put into operation, operation, make sure that all startup checks of system have

been finished. 6.12.3.2

Start the smoke smoke exhaust exhaust fan fan of main oil tank. tank.

6.12.3.3

Start AC lubricating oil pump and hydrogen seal oil pump. Check and make make sure that all pressure

meters of system indicate correctly. correctly. 6.12.3.4

Interlocking switch of DC lubricating lubricating oil system is put into standby. standby.

6.12.3.5

For system’s system’s initial operation and putting into operation after overhaul, the check valve valve installed on

oil ejector outlet shall be adjusted by maintainer. maintainer. 6.12.3.6

Check and make sure that oil flow of oil return peephole of all bearings are normal. normal.

6.12.3.7

Check whether the bearing lubricating oil temperature is normal. If the oil temperature is too low, low,

check the oil heater of main oil tank. 6.12.4 6.12.4.1

Shutdown of lubricating oil system Barring shall operate continuously continuously till the peak temperature temperature of steam steam turbine cylinder is lower than

150℃; only when the peak temperature of cylinder is lower than 120 ℃ can the lubricating oil system s ystem of main engine be stopped. Pay attention that sealing oil system shall operate normally. 6.12.4.2

After the shutdown shutdown of main engine engine barring, relieve relieve the interlocking interlocking of main main engine DC oil oil pump

and stop the jacking oil pump according to the cylinder temperature. Pay attention to check the oil level rising of main oil tank. If the oil level is too high, it shall overflow to the storage oil tank outside main plant and it’s prevented from flowing out of main oil tank. 6.12.4.3

Close the inlet and outlet valve valve of cooling water water of oil cooler. cooler.

6.12.4.4

If needed, stop stop the main engine engine lubricating lubricating oil purification plant.

6.12.4.5

When the lubricating lubricating oil system and sealing oil system system have been been stopped for 2 hours, the smoke

exhaust fan of main oil tank can be stopped. 6.12.5 6.12.5.1

Stipulation of main engine barring Continuous barring must be put into operation operation four hours before before impulse starting of steam steam turbine;

during continuous barring, if main shaft is still for operational needs or due to barring fault, continuous barring shall be operated operated for another four hours hours before the engine is started again. Steam Turbine Operation Manual Page 167 of 197


6.12.5.2

When barring barring is operating, make sure that lubricating oil, jacking oil and sealing oil shall not be

broken off and oil pressure shall be sufficient. sufficient. Rotor eccentricity eccentricity shall not exceed 0.076mm. 0.076mm. 6.12.5.3

After the shutdown shutdown of steam turbine, turbine, barring and lubricating lubricating oil circulation shall shall operate

continuously for at least 48 hours till the rotor is cooled below 150 ℃. Monitor the relevant parameter change of main engine. 6.12.5.4

Continuous barring can be stopped only after the first-stage metal metal temperature of cylinder is lower

than 150℃; after barring is stopped, lubricating oil system shall operate continuously. continuously. 6.12.5.5

If continuous barring barring fails to operate due to the stuck of dynamic-static dynamic-static part part caused by thermal

shock and thermal deformation, then operate the barring manually; if it fails, then try it again after an hour; if it fails again, try it again after another hour. If it still does not work, it perhaps is the cause of dynamic-static deformation. Under this situation, preserve the heat for one to two days, then operate the barring to eliminate the dynamic-static dynamic-static stuck. Note: It’s absolutely prohibited to steam the tur bine or move rotor by crane. crane. 6.12.5.6

Under the condition that jacking jacking oil pump pump cannot be put into operation, operation, barring must continue for

steam turbine. “Stuck -slip” phenomenon may take place during barring, take the following measures for handling until the jacking oil pump restores normal operation. (1) Start DC accident oil pump to increase lubricating oil quantity and try to reduce oil temperature as much as possible, but shall not be lower than 27℃. (2) Wait for one min. If “Stuck “Stuck -slip” phenomenon still exists, stop barring for 15 min, and then start barring. (3) If “Stuck -slip” phenomenon still exists, then stop barring again and rotate rotor 180°every 10 min to straighten rotor. Repeat the above abov e process till the “Stuck -slip” phenomenon disappears and barring device is put into operation. 6.12.5.7

During barring period after after shutdown, all all systems relevant relevant to steam turbine ontology are prohibited

for overhaul. Cool steam and water are prohibited to enter into steam turbine. Pay attention to monitor the change trend of cylinder metal temperature: pay attention to the upper and lower cylinder temperature difference, main and reheat steam system, upper and lower temperature difference of all steam extraction pipes as well as the change of container water level and pressure and temperature. If the upper and lower temperature difference enlarges acutely, find out the reason for water or cool steam inflow immediately, cut off water, water, steam source and drain ponding. 6.12.5.8

During continuous barring, if continuous barring must be stopped for operational needs or due to

fault, it shall be approved by chief engineer and the following principles must be followed: (1) For overhaul due to barring device fault or other operational needs, after the barring is broken off, mark on corresponding positions of rotor and record the time of barring shutdown. (2) After the shutdown of barring, move the rotor 180°before continuous barring is restored. At this Steam Turbine Operation Manual Page 168 of 197


moment, pay special attention to the rotor eccentricity and make sure that barring current does not rise or fluctuate overly. 6.12.5.9

During continuous barring period, period, under special special situations, shaft-jacking device device can be stopped,

but the barring current must be monitored. When the increment value of barring current is not 120% larger than the normal value, shaft-jacking device can be stopped for continuous barring. Otherwise, shaft-jacking device must be put into production for barring. 6.12.5.10

During continuous barring period, period, if there is obvious metal metal friction sound in the cylinder cylinder and the

barring current fluctuates with large margin (not the fault of barring device), stop the continuous barring immediately and change it to manual barring for straight shaft according to the above regulation until the barring device can can be restored and used. used. 6.13

Putting into into operation operation and and shutdown shutdown of main engine engine oil cooler

6.13.1

Standby application of oil cooler

6.13.1.1

During operation, standby oil cooler shall be filled with with oil and the oil cooler after after overhaul must

be charged oil before it is used as standby: standby: open the oil inlet and outlet; stop using cooling cooling water. water. 6.13.1.2

Check and make make sure that main engine oil level is above 0, otherwise, charge charge oil to main oil tank.

6.13.1.3

When one oil cooler is operating and another is is filling oil after overhaul, overhaul, open the oil feeding valve

of oil cooler and pay attention to watch the change of lubricating oil pressure. After the air of oil cooler is discharged, close the oil feeding valve. 6.13.2

Putting into operation of water-side of oil cooler

6.13.2.1

Close the water-side water-side drain drain valve at the bottom of oil cooler and close the outlet valve valve of oil cooler. cooler.

6.13.2.2

Open the water-side water-side air vent valve valve of oil cooler. cooler.

6.13.2.3

Confirm that isolating isolating valves in front of and at rear rear of cooling water regulating regulating valve of oil cooler cooler

are opened and the bypass valves are closed. 6.13.2.4

Open the inlet valve of oil oil cooler slight to fill water and and discharge discharge air to oil cooler; cooler; close it when

vent valve shows water. 6.13.2.5

Open the outlet valve of oil cooler. cooler.

6.13.2.6

Confirm that the cooling water water regulating valve of oil cooler controls controls the air air source and regulating

is normal. 6.13.3 6.13.3.1

Switchover of oil cooler For switchover switchover of oil cooler during operating, pay attention to the change of oil level of main main oil

tank, lubricating oil pressure and temperature. 6.13.3.2

Confirm the operating operating state of A, B oil coolers. coolers.

6.13.3.3

After standby oil cooler is filled with with oil, put the cooling water of oil cooler into operation.

6.13.3.4

Slowly rotate rotate the hand wheel wheel of switch-over switch-over valve valve and when when it rotates for 90°,check 90°,check and make make sure Steam Turbine Operation Manual Page 169 of 197


that the indicator screw on hand wheel points to the center and oil cooler is operating in parallel. 6.13.3.5

Continue rotating the the hand wheel wheel to oil cooler direction for 90°, check and make sure that the

indicator screw on hand wheel point to standby oil cooler, switch over the standby oil cooler for operation. Pay attention to the moving condition of cooling water regulating valve and confirm that the oil outlet flow temperature of oil cooler is between 40±2 ℃ and lubricating oil pressure is normal. 6.13.3.6

After the switchover switchover is normal, normal, stop the cooling cooling water of originally operating operating oil cooler and the

which shall be switched to standby state. 6.13.4

Shutdown of oil cooler

6.13.4.1

Check and and confirm the operating operating state of A, B oil coolers. coolers.

6.13.4.2

Switch over the switch-over valve of oil cooler to the operating position of another oil cooler; cut

off the oil circuit of shutdown oil cooler. 6.13.4.3

If the shutdown shutdown oil cooler needs overhauling, open the oil outlet valve at at the bottom of, and the

vent valve at oil side of oil cooler to discharge the oil of the oil cooler. 6.13.4.4

Close the inlet and outlet valve of oil cooler, cooler, open the water drain valve at the bottom and vent

valve at water side of oil cooler to discharge the water. water. 6.14

Putting into operation and shutdown of EH oil system system The main functions of EH oil system oil supply device are to supply hydraulic power for main engine

steam turbine, main throttle valve of steam pump small steam turbine, actuator of governing valve and maintain the normal physical and chemical property of hydraulic oil. EH oil system is composed of oil tank, two sets of EH oil pump-motor components, control module, filter, magnetic filter, overflow valve, energy accumulator, self-circulating cooling system, control fluid regenerative filter system, EH oil tank heater, ER terminal box and some standard equipment for alarming and indicating and controlling to oil pressure, oil temperature and oil level. 6.14.1

Check before EH oil system system is put into operation

6.14.1.1

Confirm that the oil level of EH oil tank is slightly higher than normal normal oil level and oil quality is

purified. 6.14.1.2

Confirm that all tests of EH oil system are are qualifies and all interlocking protection is put into

operation. 6.14.1.3

Open the first first and secondary secondary valves of all pressure pressure switches and close all the oil drain valves and

outlet valves. 6.14.1.4

Control power power is put into operation and signal signal is normal.

6.14.1.5

Start isolating valve valve and put one set of EH oil cooler into into operation.

6.14.1.6

Confirm that that closed cooling cooling water system is put into operation operation and air air is discharged. discharged.

6.14.2

Leakage check of system



6.14.2.1

EH oil pump, pump, cooling oil pump and and filter pump motors have have been delivered power. power.

6.14.2.2

Start cooling oil pump and the operation operation steps are as follows:

(1) Start the oil inlet valve of cooling oil pump; (2) Open the inlet valve of cooler; (3) Start cooling oil pump; check and confirm that vibration and sound are normal; (4) Check and confirm that cooling oil pump pipeline system is free of oil leakage; 6.14.2.3

Start and stop of control fluid regenerative pump

(1) Start oil inlet valve of regeneration pump; (2) Start the bypass valve of kieselguhr filter; (3) Start regeneration pump; check and confirm that vibration and sound are normal; (4) Slowly open the oil inlet valve of kieselguhr strainer; (5) Close the bypass valve of kieselguhr strainer gradually; (6) Confirm that the differential pressure of kieselguhr strainer strainer is normal normal and less than

0.24Mpa;

(7) Confirm that control fluid regenerative system is free of oil leakage without abnormal conditions; (8) Stop control fluid regenerative regenerative pump. 6.14.2.4

Start and stop of EH oil pump

(1) Confirm that oil temperature of oil tank is between 21℃~37℃; (2) Open the oil inlet valve of EH oil pump to take oil in and discharge air; (3) Confirm that the following valves are fully open: a. Outlet valve of EH oil pump; b. Manual valve of main main engine EH oil protopipe; (4) Start EH oil pump A or B; check and confirm that vibration, sound and pressure are normal and system is free of oil leakage; (5) Check and confirm that the oil level of oil tank is normal; or refuel; (6) Check and confirm that EH oil piping system is free of oil leakage; (7) Stop EH oil pump; (8) Start and stop another EH oil pump by the same operating steps. 6.14.3

Check of nitrogen energy accumulator

6.14.3.1

Confirm that inlet valves of energy energy accumulator accumulator are full closed and oil drain valves valves are full open.

6.14.3.2

Check and confirm confirm that nitrogen nitrogen has been filled to the set pressure. If the pressure pressure is lower than set

value, aerate again. 6.14.3.3 6.14.4 6.14.4.1

After check is finished, close close oil drain valve valve and open inlet valve of energy accumulator accumulator.. Putting into operation of EH oil system Confirm that closed cooling water water system has been put into operation. Steam Turbine Operation Manual Page 171 of 197


6.14.4.2

Confirm that cooling pump is at “automatic” position. If the EH oil temperature is lower lower than 21℃,

then heater will start automatically. 6.14.4.3

Start a set of EH oil pump and put another pump on DCS into “standby” after comprehensive

inspection check is normal. 6.14.4.4 6.14.5

Check and confirm confirm that all all the pressure meters meters on EH oil system device device panels indicate indicate normally. normally. Shutdown of EH oil system

6.14.5.1

This system shall not be stopped unless EH oil system has to

6.14.5.2

Relieve the “standby” of standby EH oil pump on DCS and stop the operating EH oil pump.

6.14.5.3

Close the cooling water water inlet inlet valve valve of oil cooler. cooler.

6.14.6

operate.

Switchover of EH oil pump

6.14.6.1

Check and confirm that that system is operating steadily steadily and standby pump is in good condition.

6.14.6.2

Start standby pump; check and confirm confirm that that everything is normal. normal.

6.14.6.3

Stop the original original operating pump. pump. Confirm that this pump has stopped operating and outlet

protopipe pressure is normal. normal. 6.14.6.4

Put the shutdown EH oil pump on DCS into “standby”.

6.14.6.5

Check and and confirm that EH oil system is operating normally. normally.

6.14.7

Operating maintenance of oil system

6.14.7.1

Ambient lighting of equipment equipment is sufficient; oil level level of oil tank is normal and all all pressure

indicators are normal. 6.14.7.2

Leakage condition of EH oil system.

6.14.7.3

Oil tank temperature is normal.

6.14.7.4

Vibration Vibration and sound of oil pump and system system pipeline are normal. normal.

6.15

Putting into into operation operation and and shutdown shutdown of generator sealing oil oil system This sealing oil system is auxiliary system set up for steam turbine generator, which can provide

continuous sealing oil for generator sealing pad, seal the hydrogen in the sealing generator and prevent from outward leakage. The system is cartridge type, which corresponds to the double ring s ealing pad of generator. Two oil supply tanks are set in the sealing pad to form independent hydrogen-side and air-side sealing oil system. It is composed of two sets of air-side sealing oil pumps (screw-type constant flow pump), two sets of hydrogen-side AC sealing oil pumps (screw-type constant flow pump), two sets of air-side, hydrogen-side coolers and filters, one air-side oil return tank, one set of hydrogen-side oil return tank, differential valve, balance valve and other components. 6.15.1 6.15.1.1

Check before before generator sealing oil system system is put into operation Put all control power supply

and signal power source into operation; operation; all kinds of

thermo-technical thermo-technical instruments are complete and put into operation; Steam Turbine Operation Manual Page 172 of 197


6.15.1.2

Test Test insulation to to equipment motor and deliver power power after mechanical part is ready; ready;

6.15.1.3

Closed cooling water system is put into operation.

6.15.1.4

Open the valves valves of all pressure pressure meters, meters, differential differential pressure gauge gauge and regulator regulator gauge; open the

isolating valve for oil level inspection; all the strainers rotate flexibly. 6.15.1.5

Open the inlet valve of hydrogen-side sealing oil pump. pump.

6.15.1.6

Appropriately open the outlet recirculation recirculation valve of air-side, hydrogen-side sealing oil pump (Lock

after adjustment). 6.15.1.7

Open the inlet valve, valve, outlet cooling water valve valve of air-side, air-side, hydrogen-side sealing sealing oil cooler

prepared for putting into operation; close the inlet valve and open the outlet outlet valve of standby cooler; open the outlet valve of air-side strainer. strainer. 6.15.1.8

Open the inlet valve of air-side, air-side, hydrogen-side hydrogen-side sealing oil strainer and close the bypass valve.

6.15.1.9

Close the rear manual manual valve of hydrogen-side sealing oil#1 pressure-balanced pressure-balanced valve; close the

pressure gauge of air-side, air-side, hydrogen-side hydrogen-side sealing oil; 6.15.1.10

Close the rear manual valve of hydrogen-side sealing sealing oil#2 pressure-balanced pressure-balanced valve; close the

pressure gauge of air-side, air-side, hydrogen-side hydrogen-side sealing oil; 6.15.1.11

Drop the hand hand screw of oil level level regulation float valve of hydrogen-side oil return tank to make

two float valves in free state; 6.15.1.12

Close the hydrogen-side hydrogen-side pressure gauge oil release release valve of main differential differential pressure pressure regulator. regulator.

6.15.1.13

Close the hydrogen-side hydrogen-side pressure gauge oil release release valve of standby standby differential differential pressure

regulator. 6.15.1.14

Open the inlet valve of air-side air-side sealing oil pump. pump.

6.15.1.15

Open the manual valve valve of outlet protopipe of air-side air-side sealing sealing oil pump.

6.15.1.16

Place the oil return stop valve valve from hydrogen hydrogen side to air side and the oil drain valve from

hydrogen-oil separator to sealing oil tank in automatic regulating state; appropriately open the oil filling valve of hydrogen-side oil tank and close the hydrogen-side constraint oil release valve. 6.15.1.17

The following valves shall shall be regulated regulated to conform conform to regulations before before sealing oil system is put

into operation: (1) Hydrogen-side sealing oil two-end pressure-balanced valve. (2) Air-side sealing oil main differential pressure regulating valve and standby oil pressure difference regulating valve. (3) Steam turbine main oil pump oil supply reducing valve and the safety gate behind it. (4) Outlet recirculation valve of air-side sealing oil pump. (5) Outlet recirculation valve of hydrogen-side sealing oil pump. 6.15.2

Operating provisions of sealing oil system Steam Turbine Operation Manual Page 173 of 197


6.15.2.1

Sealing oil system shall be put into operation operation 60 hours hours before impulse starting of steam turbine and

generator is filled with hydrogen. 6.15.2.2

Sealing oil pressure must be kept when generator is full full of hydrogen or during during steam turbine

barring. 6.15.2.3

When generator generator is full full of hydrogen, hydrogen, the smoke smoke ventilator of air-side hydrogen-oil separator separator shall

operate continuously. 6.15.2.4

Before sealing sealing oil system system is put into operation, put into the main engine lubricating oil system.

6.15.2.5

The hydrogen hydrogen in the generator must be emptied before before lubricating oil main oil tank is draining oil.

6.15.3 6.15.3.1

Putting into operation of system Confirm that the start condition of air-side sealing sealing oil pump is satisfied; satisfied; start air-side air-side sealing oil

pump, check and make make sure that it is in good operation. operation. 6.15.3.2

Adjust the pump outlet recirculation recirculation valve to keep the rear oil pressure of oil filter in 0.8Mpa and

oil temperature between 27~50 ℃. 6.15.3.3

Smoke ventilator ventilator shall start jointly automatically; after the operation operation is normal, normal, interlock the

standby smoke ventilator. ventilator. 6.15.3.4

Start the hydrogen-side, oil-side balance gate of pressure regulator to put differential differential pressure

valve into operation. If the differential pressure valve is out of order, keep the oil pressure in normal operation by outlet recirculation valve. 6.15.3.5

Charge oil to hydrogen-side oil return return tank to the normal.

6.15.3.6

Start the air-side, hydrogen-side hydrogen-side sealing sealing oil valve of two-side balance valves of sealing oil and put

balance valve into operation. 6.15.3.7

Put the hydrogen-side hydrogen-side AC sealing sealing oil pump into operation and and keep the rear oil pressure of pump

outlet recirculation valve in 0.8Mpa; pay attention that the oil pressure difference before air-side and hydrogen-side sealing oil shall not be over 0.49Kpa. 6.15.3.8

Conduct sealing sealing oil system protection protection and oil pump linkage tests according to provisions. provisions.

6.15.3.9

If balance valve and pressure difference difference regulator regulator cannot cannot guarantee the required oil pressure during during

operation, the oil pressure shall be kept by b ypass valve and put into operation again after the reason is found out. 6.15.4 6.15.4.1

Operating maintenance of system Monitoring of normal operation

(1) Kee p the hydrogen pressure pressure in 0.4Mpa for unit’s unit’s normal operation. (2) Keep the hydrogen-oil pressure difference between 0.085±0.01Mpa. (3) Keep the oil supply pressure difference of hydrogen-side and air-side sealing oil between 0.49Kpa. (4) Outlet oil temperature of sealing oil cooler shall be kept between 27~49℃. Steam Turbine Operation Manual Page 174 of 197


(5) Oil return temperature of air-side sealing oil shall be <56 ℃. (6) Oil return temperature of hydrogen-side sealing oil shall be <64 ℃. (7) Bearing oil level, temperature and vibration of oil pump and motor. motor. (8) Oil level of hydrogen-side and air-side oil tank. (9) Vacuum Vacuum degree of air-side oil return tank shall be kept between -250~-500Pa. (10) Oil supply pressure of steam turbine main oil source. (11) Smoke ventilator operates in good condition. Note: Air-side sealing oil system can operate alone (hydrogen-side sealing oil pump is shut down for overhaul), but the monitoring on hydrogen pressure and purity shall be strengthened. Keep the hydrogen purity higher than 90%. 6.15.4.2

Oil source source of air-side air-side and hydrogen-side hydrogen-side sealing oil

(1) Oil source for air-side sealing oil a. Main working oil source: air-side sealing oil normal working oil source is provided by AC sealing oil pump with outlet pressure 0.8Mpa. b. First standby oil source: it is the high pressure oil from steam turbine oil pump and hydrogen sealing standby oil pump. When the main working oil source occurs fault and hydrogen oil pressure lowers to 0.056Mpa, this oil source will be put into operation automatically by standby pressure difference difference regulator. c. Second standby oil source: it is provided by high pressure sealing oil standby pump on steam turbine main oil tank. When the rotating speed of steam turbine is lower than 2850rpm or when steam turbine occurs fault and hydrogen oil pressure lowers to 0.056Mpa, the sealing oil will be provided by high pressure sealing oil standby pump. d. Third standby oil source: it is provided by DC sealing oil pump. When hydrogen oil pressure lowers to 0.035Mpa, start DC sealing oil pump and this oil pump is only allowed to operate for about 1 hour. e. Fourth standby oil source: it is provided by main engine lubricating oil pump. The oil pressure it provides is low and the normal normal is 0.035~0.105Mpa. (2) Oil source for hydrogen-side sealing oil Hydrogen-side sealing oil normal working oil source is provided by two sets of AC sealing oil pumps and they alternate. 6.15.5 6.15.5.1

Shutdown of system Conditions of shutdown

(1) Hydrogen in the turbine has been all replaced by air; air purity is 100% and the pressure in the turbine is above 50kPa; (2) Steam turbine barring has been stopped. When rotor is rotating, sealing oil system shall not stop, or it will damage the sealing pad. Steam Turbine Operation Manual Page 175 of 197


6.15.5.2

Shutdown of sealing oil system

(1) Relieve the interlock of standby sealing oil pump; (2) Stop the AC sealing oil pump. (3) After sealing oil system is stopped for 2 hours, stop the operation of smoke ventilator. 6.16

Putting into operation and and shutdown shutdown of generator hydrogen cooling system system Generator adopts water-hydrogen cooling way: stator winding is water cooling, rotor winding is

hydrogen inner cooling and iron core is hydrogen outer cooling. Hydrogen system is mainly composed of 2

high pressure hydrogen storage tank, standby hydrogen cylinder, CO steel cylinder for replacement, hydrogen dryer, hydrogen decompressor, hydrogen filter, purity analyzer, liquid detector and hydrogen dew-point instrument. It mainly provides appropriate pressure, high-purity cooling hydrogen for generator rotor winding and stator iron core; meanwhile, it will finish the cooling, drying and detecting to hydrogen. 6.16.1

Check before before gas replacement replacement of generator and precautions precautions for replacement

6.16.1.1

Sealing oil system shall operate reliably, reliably, oil-hydrogen pressure difference shall be kept within within

0.08~0.085Mpa and generator rotor shall be in static or barring state. 6.16.1.2

Relevant meters meters and alarming devices devices shall shall be verified and tested with qualification. qualification.

6.16.1.3

Generator shall be sealed completely and generator generator gas leak test test is qualified.

6.16.1.4

All the flame operations in the machine machine room have been completed.

6.16.1.5

There is certain certain pressure in the generator. generator.

6.16.1.6

Confirm that sealing oil pressure difference regulating valve valve characteristic characteristic test is qualified; keep

the gas pressure in turbine at 50Kpa during gas replacement process. 6.16.1.7

Notify the hydrogen generation generation station to prepare sufficient sufficient hydrogen before filling hydrogen and 2

confirm that hydrogen supply is stopped before hydrogen is drained. There shall be sufficient CO on the site for gas replacement and the purity shall be tested qualified. 6.16.1.8

Generator gas leak test shall be qualified.

6.16.1.9

When operating hydrogen system valve, open and and close it slowly. slowly. Try to operate by hand as much

as possible. For special condition, use copper wrench. During operation, it shall prevent hydrogen from bursting out from valve valve and causing fire. 6.16.1.10

2

Press H2 system valve valve checking card (before (before gas replacement by CO ) to check whether system

valve switch state is correct. 6.16.2

CO2 Replace the air in generator by CO

2

6.16.2.1

Close the compressed air isolating valve to generator generator..

6.16.2.2

Close the main valve valve from hydrogen generation generation station station to hydrogen protopipe.

6.16.2.3

Close the main steam supply valve valve of hydrogen cylinder. cylinder.

6.16.2.4

Close the front stop valve of hydrogen hydrogen pressure regulating regulating valve, rear stop valve of hydrogen hydrogen



pressure regulating valve valve and bypass valve valve of hydrogen pressure pressure regulating valve. 6.16.2.5

Close the main valve of hydrogen hydrogen supply pipe.

6.16.2.6

Open hydrogen replacement valve.

6.16.2.7

Close CO2 replacement replacement valve.

6.16.2.8

Open the main door of CO2 supply. supply.

6.16.2.9

Open the main valve of CO2 tank supply supply CO2 pipe.

6.16.2.10

Open and regulate the main air vent vent valve of gas replacement replacement and keep keep the inner pressure pressure

between 40~50kPa; meanwhile, pay attention that the sealing oil pressure shall be higher than in ner pressure 80kPa. 6.16.2.11

When the generator’s inner CO2 purity is higher than 90%; 90 %; open the leakage detector valve(1). valve(1).

6.16.2.12

Open the leakage leakage detector detector drain valve valve 138 and and close leakage leakage detector valve and drain valve after

sampling is tested qualified. 6.16.2.13

Open the leakage detector valve (2).

6.16.2.14

Open the leakage detector drain drain valve and close leakage detector valve valve and drain valve after



6.16.2.16

Open the leakage detector drain drain valve and close leakage detector valve valve and drain valve valve after


Open the monitor rack valve valve of generator generator working working conditions. conditions.

6.16.2.18

Open drain valve valve of generator, generator, close the generator generator working condition condition monitoring rack rack valve and

generator drain valve after CO2 purity is qualified. 6.16.2.19


6.16.2.20




6.16.2.22

Open the leakage detector drain valve and close leakage leakage detector valve valve and drain valve valve after



6.16.2.24




6.16.2.26



Open hydrogen-to-hydrogen hydrogen-to-hydrogen purity instrument instrument valve and close it after CO2 purity is qualified. Steam Turbine Operation Manual Page 177 of 197


6.16.2.28

Open hydrogen-to-hydrogen hydrogen-to-hydrogen hygrograph hygrograph valve. Open hydrogen hygrograph valve valve inlet hand

valve and hydrogen hygrograph valve drain hand valve. 6.16.2.29

Open hydrogen drain valve. Close hydrogen hygrograph hygrograph valve inlet inlet and drain hand valve after

CO2 purity is qualified. 6.16.2.30

Open hydrogen – toto- hydrogen dryer valve. Close hydrogen hygrograph valve inlet and drain hand

valve after CO2 purity is qualified. 6.16.2.31

Close hydrogen-to-hydrogen hydrogen-to-hydrogen hygrograph valve.

6.16.2.32

When the CO2 purity in the generator generator reaches reaches 95% and above, close the main valve valve of CO2 tank

supply CO2 pipe and main CO2 supply gate. 6.16.3

Replace CO2 in generator by H2

6.16.3.1

Check and close the inlet valve valve and air return valve valve of hydrogen hydrogen purity instrument.

6.16.3.2

Disconnect the H2 purity meter, meter, and deliver power when the H2 purity in generator reaches 90%

and above. 6.16.3.3

Confirm that that house-use compressed air air to hydrogen hydrogen pipe hand hand valve is closed tightly.

6.16.3.4

Confirm that the CO2 purity in generator reaches reaches 95% and above above and the inner pressure is about

40kPa. 6.16.3.5

Contact hydrogen generation station to supply hydrogen.

6.16.3.6

Open the main gate gate of hydrogen generation station to hydrogen protopipe. protopipe.

6.16.3.7

Open the front stop valve and rear stop valve of hydrogen pressure pressure regulating valve.

6.16.3.8

Open the main valve of hydrogen hydrogen supply pipe.

6.16.3.9

Check and and confirm that hydrogen replacement replacement valve is closed tightly. tightly.

6.16.3.10

Regulate the hydrogen hydrogen pressure regulating regulating valve to make hydrogen supply supply protopipe pressure pressure

higher than 50Pa. 2

6.16.3.11

Open CO replacement valve.

6.16.3.12

Open and regulate regulate gas replacement replacement exhaust main valve to keep the inner pressure pressure of generation to

50kPa; pay attention to sealing oil. 6.16.3.13

Differential Differential pressure regulating valve valve is in normal operation and make sealing oil pressure pressure higher

than inner pressure 80kPa. 2

6.16.3.14

When the H purity in generator is above 90%, open leakage detector valve (1).

6.16.3.15

Open the leakage leakage detector drain drain valve and close leakage detector valve and drain valve after



6.16.3.17

Open the leakage leakage detector drain drain valve and close leakage leakage detector valve valve and drain valve valve after

sampling is tested qualified. Steam Turbine Operation Manual Page 178 of 197


6.16.3.18


6.16.3.19




6.16.3.21




6.16.3.23




6.16.3.25




6.16.3.27




6.16.3.29

Open generator generator exhaust valve and close close it when H purity is qualified.

6.16.3.30

After H2 purity is qualified, open the hydrogen-to-hydrogen hydrogen-to-hydrogen purity instrument valve. valve.

6.16.3.31

Open hydrogen-to-hydrogen hydrogen-to-hydrogen hygrograph hygrograph valve. Open hydrogen hygrograph hygrograph valve inlet and

2

exhaust hand valve. 6.16.3.32

Open hydrogen hydrogen exhaust exhaust valve valve and close it after H2 purity is qualified.

6.16.3.33

Open hydrogen – toto- hydrogen dryer valve. Close hydrogen hygrograph valve inlet and exhaust

hand valve after CO2 purity is qualified. 6.16.3.34

2

2

When the H purity in generator reaches 96% and above, close CO replacement valve and gas

replacement exhaust main valve. Replacement is over. 6.16.4

Putting into operation of hydrogen cooler

6.16.4.1

Water discharge discharge valve of inlet and outlet pipe of cooler;

6.16.4.2

Slowly open the inlet valve valve of hydrogen cooler and close close the air relief when water is seen in the air air

discharging pipe. 6.16.4.3

Open the outlet valve of hydrogen cooler;

6.16.4.4

Open the front front and rear rear isolating valve valve of hydrogen hydrogen temperature temperature regulating valve and close close bypass

valve to put the hydrogen cooler temperature regulating valve into “automatic”. 6.16.5 6.16.5.1

Hydrogen cooling system monitoring during generator operation When generator is operating normally, normally, the hydrogen pressure in the generator shall be kept at Steam Turbine Operation Manual Page 179 of 197


500kPa (local control panel indicator). It will give an alarm when it is higher than 520kPa or lower than 480 kPa. When the hydrogen pressure is too high, open the exhaust valve to exhaust some hydrogen and reduce the pressure to normal value. Inner hydrogen pressure of generator must be higher than stator cooling water pressure. When hydrogen pressure is lower than 480 kPa (DCS indicator), charge hydrogen to generator and the maximum hydrogen charge quantity is 19m /day. Conduct leakage test if it exceeds this limit value. 6.16.5.2

When generator generator is operating, operating, the minimum value value of H2 purity purity shall be 95% and dew point

temperature shall be 0 ℃. If purity or humidity is not qualified, drain the dirt and charge hydrogen to generator so as to improve purity and reduce humidity. 6.16.5.3

During generator’s normal operation, H2 moisture removal device shall be put into operation. into operation.

6.16.5.4

During generator’s normal operation, to make hydrogen cooling system operate in good condition,

the sealing oil system must be kept operating normally. normally. 6.16.5.5

For generator’s generator’s normal operation, all the hydrogen coolers shall be put into operation. operation. If one set of

hydrogen cooler quits operating, generator load shall be limited to 80% of rated load. 6.16.5.6

During normal operation, the generator generator hydrogen inlet temperature must be lower than stator

cooling water inlet temperature. All the four temperature measuring points of hydrogen cooler outlet shall be lower than generator stator cooling water inlet temperature. 6.16.5.7

When one of the four measuring measuring points of hydrogen cooler cooler outlet temperature temperature has big deviation

from the average value of the other three points, contact service for handling timely. 6.16.5.8

If any measuring measuring point of generator generator hydrogen hydrogen cooler outlet temperature temperature is higher higher tha generator

stator cooling water inlet temperature, check and regulate hydrogen temperature or stator cooling water temperature to normal range. If it is caused by incorrect measuring indication, contact service for handling timely. 6.16.6

Replace H2 in generator by CO2

6.16.6.1

Close the compressed air isolating valve to generator generator..

6.16.6.2

Close the main valve valve from hydrogen generation generation station station to hydrogen protopipe.

6.16.6.3

Close the main steam supply valve valve of hydrogen cylinder. cylinder.

6.16.6.4

Close the front stop valve of hydrogen hydrogen pressure regulating regulating valve, rear rear stop valve of hydrogen

pressure regulating valve valve and bypass valve valve of hydrogen pressure pressure regulating valve. valve. 6.16.6.5

Close the main valve of hydrogen supply pipe.

6.16.6.6


6.16.6.7

Close CO2 replacement replacement valve.

6.16.6.8

Open the main door of CO2 supply. supply.

6.16.6.9

Open the the main main valve valve of CO2 tank supply CO2 pipe.

6.16.6.10

Open and regulate regulate the main air vent valve of gas replacement and keep keep the inner pressure pressure



between 40~50kPa; meanwhile, pay attention that the sealing oil pressure shall be higher than inner pressure 80kPa. 6.16.6.11

When generator’s enerator’s inner CO2 purity is higher than 90%, open the leakage detector valve(1). valve(1).

6.16.6.12

Open the leakage detector drain drain valve and close leakage leakage detector valve valve and drain valve after



6.16.6.14




6.16.6.16




6.16.6.18

Open exhaust valve of generator and close the monitor monitor rack valve of generator generator working

conditions and exhaust valve of generator after sampling is tested qualified. 6.16.6.19


6.16.6.20




6.16.6.22




6.16.6.24




6.16.6.26



Open hydrogen-to-hydrogen hydrogen-to-hydrogen purity instrument instrument valve and close it after CO2 purity is qualified.

6.16.6.28

Open hydrogen-to-hydrogen hydrogen-to-hydrogen hygrograph hygrograph valve. Open hydrogen hygrograph valve inlet hand



CO2 purity is qualified. 6.16.6.30


valve after CO2 purity is qualified. 6.16.6.31

Close hydrogen-to-hydrogen hydrogen-to-hydrogen hygrograph valve. Steam Turbine Operation Manual Page 181 of 197


6.16.6.32

When the CO2 purity in the generator generator reaches reaches 95% and above, close the main valve valve of CO2 CO2 tank

supply CO2 pipe and main CO2 supply gate. 6.16.7

CO2 Replacement of generator generator CO2 by compressed air

6.16.7.1

Check and close close the main door of hydrogen hydrogen production station station to hydrogen protopipe, main door

of hydrogen cylinder steam supply and front and rear stop valve of hydrogen pressure regulating valve as well as bypass valve of hydrogen pressure regulating valve. 6.16.7.2

Open the drain valve valve of plant-use compressed compressed air to generator replacement-use replacement-use protopipe and close

it after water is drained. 6.16.7.3

Check and close close hydrogen replacement valve, valve, main CO2 supply gate and main valve of CO2 tank

supply CO2 pipe. 6.16.7.4

Open CO2 replacement valve.

6.16.7.5

Open the main valve of hydrogen hydrogen supply pipe.

6.16.7.6

Open and regulate regulate the main main air vent valve of gas gas replacement and keep the inner pressure between

40~50kPa; meanwhile, pay attention that the sealing oil pressure shall be higher than the inner pressure 80kPa. 6.16.7.7

Open the the isolating valve to generator generator compressed compressed air. air.

6.16.7.8


6.16.7.9

Open the leakage detector drain drain valve and close leakage detector valve valve and drain drain valve after



6.16.7.11




6.16.7.13

Open the leakage leakage detector drain drain valve and close leakage detector valve valve and drain valve valve after



6.16.7.15




6.16.7.17




6.16.7.19

Open the leakage leakage detector drain drain valve and close leakage detector valve and drain valve valve after

sampling is tested qualified. Steam Turbine Operation Manual Page 182 of 197


6.16.7.20


6.16.7.21




6.16.7.23

Open exhaust valve of generator and close the monitor monitor rack valve of generator generator working

conditions and exhaust valve of generator. generator. 6.16.7.24

Open hydrogen-to-hydrogen hydrogen-to-hydrogen purity instrument valve and close it after sampling is tested

qualified. 6.16.7.25

Open hydrogen-to-hydrogen hydrogen-to-hydrogen hygrograph hygrograph valve. Open hydrogen hygrograph valve inlet hand





valve after sampling is tested qualified. 6.16.7.28

Close hydrogen-to-hydrogen hydrogen-to-hydrogen hygrograph valve.

6.16.7.29

When the CO2 purity in the generator generator is less than 5%, close the main main valve of hydrogen supply supply

pipe, CO2 replacement replacement valve and isolating valve valve to generator compressed compressed air. air. 6.16.7.30 6.16.8

Close the main exhaust valve of gas replacement. replacement.

Emergent hydrogen discharging operation

6.16.8.1

Close the front, rear stop valve and bypass valve of hydrogen pressure pressure regulating valve.

6.16.8.2


6.16.8.3

Open the main exhaust valve of gas replacement. replacement.

6.16.8.4

Reduce the H2 pressure pressure in generator to 50kPa. 50kPa. Pay attention attention that the sealing oil differential differential

pressure regulating valve is in normal operation; keep the sealing oil pressure higher than inner pressure 80Kpa. 6.16.8.5

Open main main CO2 supply valve valve and main valve valve of CO2 supply by CO2 tank.

6.16.8.6

Open all branch branch valves of CO2 cylinder and charge charge CO2 to to inner generator generator to replace H2 till it is

qualified. 6.17

Putting into operation and shutdown shutdown of generator stator cooling water water system

6.17.1

Check before before stator cooling cooling water water system is put into operation operation

6.17.1.1

System interlock interlock test is qualified and stator water system system valve position is correct. correct.

6.17.1.2

After the stator stator cooling water water tank water water filling is tested qualified, open open the water water filling valve valve

water tank to fill water. 6.17.1.3

Closed cooling water system has been put into into operation. operation. Steam Turbine Operation Manual Page 183 of 197


6.17.1.4

Control power supply , dynamic power has been delivered; delivered; instrument and alarming device device have

been put into operation. 6.17.1.5

Confirm that that generator hydrogen system and sealing oil system are operating normally. normally.

6.17.1.6

Confirm that hydrogen hydrogen pressure in inner generator has reached reached 0.2Mpa. 0.2Mpa.

6.17.2 6.17.2.1

Water injection to stator water system The water in the system shall be drained before before stator water system is injected with water. water.

(1) Stator water system is injected and flows through ionizer normally with flow 25~40L /min. (2) Confirm that front pipeline water circulation of ionizer has been washed cleanly and the water quality in the pipeline is qualified; open the front hand valve of solenoid valve. (3) Prepare the replacement of ionizer and fill water to stator water tank; start condensate pump. (4) Open inlet hand valve of ionizer. (5) Close the stator water return valve and inject water to stator water system by water feeding solenoid valve. (6) The inlet pressure of water feeding shall be 0.36Mpa and the allowed maximum water inlet temperature shall be 50 ℃. (7) When the water level in water tank is fed to normal level, solenoid valve will close automatically. automatically. (8) Open the air gate on stator water tank, cooler and pipeline, exhaust the air and then close it. 6.17.3 6.17.3.1

Start of stator cooling water pump Chemical stator stator cooling water quality shall be qualified and water water level in cooling water water tank shall

be normal. 6.17.3.2

Open stator cooling water pump and slowly open the outlet valve; check whether vibration, vibration, sound

and all bearing temperature are normal. 6.17.3.3

Check and confirm confirm that outlet pressure pressure is normal. Close vent valve valve when water is seen in ion

exchanger vent valve; regulate the recirculation valve to make generator stator inlet pressure about 320kPa (onsite indication). Regulate water tank water feeding valve to make water level normal and regulate ion exchanger flow to 25~40L /min. 6.17.3.4

After system system is operating operating normally, normally, put another stator cooling water pump pump into standby operation.

6.17.3.5

Put stator stator water water cooler cooling water into operation.

6.17.4

Shutdown of stator cooling water pump

6.17.4.1

Relieve the interlocking interlocking of standby standby stator water water cooling cooling water water pump. pump.

6.17.4.2

Stop operating stator water cooling water pump.

6.17.4.3

If stator water cooling pump pump is stopped for overhaul, disconnect the dynamic dynamic power, power, close inlet and and

outlet valve of pump to eliminate pressure and drain water. water. 6.17.5

Switchover of stator cooling water pump



6.17.5.1

Check and confirm confirm that the oil level of standby stator cooling water water pump bearing bearing oil cup is

normal and oil quality is good. 6.17.5.2

Start standby pump and make make full full inspection inspection to pump. pump.

6.17.5.3

Check and and confirm that stator cooling water water protopipe pressure is normal.

6.17.5.4

Stop the originally operating stator cooling water water pump.

6.17.5.5

Put the originally operating pump into standby. standby.

6.17.6

Monitoring items of stator water system operation:

6.17.6.1

Water level and temperature temperature of stator stator water water tank. tank.

6.17.6.2

Inlet and outlet outlet pressure, pressure, current current of stator water pump.

6.17.6.3

Stator water water pump motor motor and pump bearing oil level, bearing bearing temperature, temperature, vibration and and sound,

etc. 6.17.6.4

Inlet and outlet pressure of stator water cooler cooler outlet strainer and pressure difference. difference.

6.17.6.5

Inlet and and outlet pressure difference difference of generator generator stator cooling water water..

6.17.6.6

Inlet flow of stator cooling water. water.

6.17.6.7

Electrical conductivity of stator stator cooling cooling water water is 0.5-1.5 0.5-1.5 S/cm.

6.17.6.8

Electrical conductivity of ionizer ionizer outlet stator is 0.1-0.4 0.1-0.4 S/cm.

6.17.6.9

Inlet and outlet pressure of ionizer. ionizer.

6.18

Putting into into operation operation and and shutdown shutdown of circulating circulating water system

6.18.1 6.18.1.1

Check and preparation before putting into operation Check and confirm that all equipment, equipment, pipelines of circulating water system system are in good condition;

overhaul is finished; manhole valve is closed and work ticket has been terminated. 6.18.1.2

Check and confirm confirm that circulating circulating water system valve has been in normal normal state before start

according to the valve checking card. 6.18.1.3

Confirm that circulating water system protection and interlocking test are in good condition with

normal alarm; all thermal meters are in good indication; current meter and butterfly valve indicator light is correct. 6.18.1.4

Open the inlet and outlet valve valve of condenser condenser circulating water and air air vent valve valve of water chamber. chamber.

6.18.1.5

Confirm that the main water supply supply valve from from industrial water water to circulating circulating pump, front and and rear

isolating valve of water supply reducing valve, isolating valve from industrial water to circulating cooling/ lubricating water are opened; the isolating valve from industrial water to bearing cooler cooling water on circulating pump motor is opened. 6.18.1.6

Confirm that the circulating pump bearing cooling/lubricating water solenoid valve is opened;

check and confirm that circulating pump bearing cooling/lubricating water pressure is 0.35MPa; confirm that bearing cooler cooling water solenoid valve on circulating pump motor is opened and motor bearing cooling Steam Turbine Operation Manual Page 185 of 197


water pressure is normal. 6.18.1.7

Confirm that front and rear rear isolating valves valves from industrial water to circulating pump pump bearing

cooling/lubricating strainer and bearing cooler cooling water strainer on motor are opened on the site. 6.18.1.8

Confirm that bypass valve from from industrial water to circulating circulating pump bearing bearing cooling/lubricating cooling/lubricating

strainer and bearing cooler cooling water strainer on motor are opened on the site. 6.18.1.9

Check and and confirm that oil level of motor bearing is normal.

6.18.1.10

Open the front and rear pressure pressure meter meter gate of circulating pump cooling/ lubricating water water strain.

6.18.1.11

Dynamic power and control power supply of circulating water water pump outlet outlet butterfly valve have

been delivered. 6.18.1.12

Check and confirm that that the oil level of circulating water water pump outlet butterfly valve is normal. normal.

6.18.1.13

Set the butterfly control mode switch of local butterfly valve control panel to “linkage”.

6.18.1.14

Check the “local/remote” changeover switch of circulating pump local control cabinet and turn it

to “remote” position; confirm that all indicators shall indicate correctly. correctly. 6.18.1.15

Check and confirm that DCS picture circulating pump pump control power supply is normal without without

alarm signal; all equipment’s state indication is correct. 6.18.2

Water filling start of circulating circulating water pump:

6.18.2.1

Check and confirm confirm that circulating water pump cooling water/ water/ lubricating water, water, motor motor cooling

water flow, motor bearing oil lever are normal. 6.18.2.2

Check and confirm that the oil level and oil pressure of circulating water pump butterfly valve oil

pump station are normal. normal. 6.18.2.3

Check and confirm that the manual isolating valve of circulating water water pump packing automatic automatic

air-relief is opened; after the circulating water pump is started for operation, check and confirm that the automatic air relief of packing shall exhaust air normally. normally. 6.18.2.4

Relieve the the interlocking interlocking of standby circulating water water pump outlet butterfly butterfly valve.

6.18.2.5

Open the circulating circulating water pump outlet liquid control butterfly valve on DCS; when the light

“open 20°”is on, press the “stop” button and circulating water system will fill water. water. 6.18.2.6

Press the “start” button of circulating circ ulating water pump on DCS picture; check and confirm that

circulating water pump current is normal; confirm that circulating motor vibration, bearing temperature and motor winding temperature are normal; Keep butterfly valve opening and fill water to system. 6.18.2.7

After the air in condenser condenser water chamber chamber is exhausted, close close the water-side water-side air vent valve of

condenser. 6.18.2.8

Open the circulating circulating pump outlet liquid control control butterfly valve fully and put the outlet butterfly

valve into interlocking. 6.18.2.9

Check and confirm that that the circulating circulating pump lubricating lubricating water booster pump is started normally; normally;



lubricating water has been turn to circulating water supply and pressure and flow are normal. 6.18.2.10

Open the isolating isolating valve from circulating circulating water pump to motor cooler and confirm that that cooling

water pressure is normal. 6.18.2.11

After confirming confirming that circulating circulating water protopipe pressure is normal, turn the standby pump

switch to “standby” position. 6.18.3 6.18.3.1

Normal start of circulating water pump: Check and confirm confirm that circulating circulating water pump cooling water/ water/ lubricating water, water, motor cooling

water flow, flow, motor bearing oil lever are normal. 6.18.3.2

Check and confirm confirm that the oil level of circulating water pump outlet butterfly butterfly valve oil pump pump

station is normal. 6.18.3.3

Turn control control mode changeover changeover switch on circulating circulating pump outlet butterfly butterfly valve local control control

cabinet to “remote” position to put outlet butterfly valve into interlocking. 6.18.3.4

Start circulating circulating pump on DCS; check and and confirm that circulating pump pump outlet butterfly valve

linkage is full open. 6.18.3.5

Check and confirm that current, outlet pressure pressure and vibration vibration of circulating water pump are

normal. 6.18.3.6

Check and confirm confirm that circulating pump lubricating lubricating water booster pump is started normally; normally;

lubricating water has been turn to circulating water supply and pressure and flow are normal. 6.18.3.7

Open the isolating valve valve from circulating water pump pump to motor cooler. cooler.

6.18.3.8

Check and confirm that circulating water water pump bearing cooling/lubricating cooling/lubricating water, water, motor cooling

water pressure are normal. 6.18.4 6.18.4.1

Normal shutdown of circulating water pump Change the motor motor cooler cooling cooling water of circulating pump that needs to be stopped and pump pump

bearing lubricating water to external industrial water supply from pump outlet; confirm that motor cooler cooling water and pump bearing lubricating water pressure and flow are normal. 6.18.4.2

Relieve the interlocking of standby pump and the outlet outlet butterfly valve that needs to be stopped.

6.18.4.3

Press the “Close” button of circulating pump outlet butterfly valve that needs to be stopped and

confirm that outlet butterfly valve has started closing. 6.18.4.4

When the outlet butterfly valve is closed to 70°, the circulating pump pump will trip automatically. automatically.

6.18.4.5

Confirm that outlet butterfly valve valve is closed continuously continuously to full close. close.

6.18.4.6

Press the “Stop” button of the circulating ci rculating pump that has been stopped to reset.

6.18.4.7

Confirm that the state indication indication of pump and valve is correct. correct.

6.18.5 6.18.5.1

Emergent stop of circulating water pump Press the circulating pump accident button. Steam Turbine Operation Manual Page 187 of 197


6.18.5.2

Circulating pump pump trips, red light is off and green light will will is on.

6.18.5.3

Simultaneously, Simultaneously, outlet butterfly butterfly valve of circulating pump is closed rapidly and automatically. automatically.

6.18.5.4

Close the isolating valve valve from circulating water water pump to motor cooler cooler cooling water. water.

6.18.6

Check and maintenance and precautions during during circulating circulating water water pump operation:

6.18.6.1

Under the condition that water filling filling is started, started, the outlet butterfly valve of circulating pump pump shall

be started prior that water pump; when butterfly valve is opened to 15%~20%, circulating pump s hall start; under normal normal start, water pump and butterfly valve are allowed to start at the same time, but it’s required that butterfly valve shall be full open in 20s. If the outlet butterfly valve is not opened 30s after water pump is started, circulating pump will trip in linkage. 6.18.6.2

Monitor the circulating pump motor current and and confirm confirm that it is normal. normal.

6.18.6.3

During water filling start-up process, pay attention to monitor the vibration vibration and opening of of

circulating pump outlet butterfly valve. 6.18.6.4

Check and confirm confirm that circulating circulating pump is in correct rotating rotating direction without friction and

vibration is normal. 6.18.6.5

Check and confirm that circulating circulating pump packing shall have little leakage. leakage.

6.18.6.6

Check the circulating circulating pump cooling/lubricating water water pressure and confirm that motor cooling

water pressure shall be normal with low alarm when there is no flow; or els e, open the bypass valve, close the inlet and outlet valve of strainer and contact service to clean strainer. 6.18.6.7

Monitor the switching time time and stroke of circulating pump outlet butterfly butterfly valve.

6.18.6.8

Monitor and confirm that the outlet pressure pressure of operating circulating water water pump shall be larger larger

than 0.2MPa (single pump). 6.18.6.9 6.18.6.10

Check and confirm confirm that the system is free free of leakage. Check and confirm confirm that all all bearing temperature temperature and motor motor winding temperature temperature of circulating circulating

pump are normal. normal. 6.18.6.11

If it has been shut down for for a long time, time, it shall be injected with lubricating lubricating water for 10 min once

every week. 6.18.6.12

Check and confirm that that the oil pressure pressure of butterfly valve valve station is normal. Oil level shall be 1/2

above oil level gauge and oil temperature shall be <60 ℃. 6.18.6.13

The upper bearing oil level of circulating water water pump motor shall be on the middle position of

visual window; fill oil from top petrol tank when oil level is low. low. 6.18.6.14

For initial start, rubber guide bearing bearing shall be washed by water water for over over 20min.

6.18.6.15

When stopping the pump, close the outlet butterfly butterfly valve first and then stop the pump; pump; meanwhile

pay close attention to the butterfly valve events events to prevent circulating water water pump from reversing. reversing. 6.18.6.16

After accident accident pump shutdown shutdown occurs, close close the outlet valve immediately immediately to prevent circulating



water system from impacting. 6.18.6.17

Keep close water water over the outlet pressure of circulating water water pump, inlet and outlet pressure of

condenser circulating water to avoid the insufficient output of circulating water pump, which will cause the rise of turbine-exit temperature of condenser and dropping of vacuum. 6.18.6.18

Before circulating circulating water pump is started, first start the trash trash remover for operation and and it shall not

be stopped until circulating circulating water pump is operating operating normally. normally. 6.18.6.19

Pay attention to the front and rear water level of circulating circulating water pump trash remover; remover; when the

difference is major, major, start the trash remover timely to clean sundries. 6.18.6.20

After the circulating circulating water pump motor is changed changed from high speed to low speed, speed, confirm that

motor differential protection has been removed before it is started; after the circulating water pump motor is changed from low speed to high speed, confirm that motor differential protection has been put into operation before it is started. 6.19

Operating instruction on rubber ball washing

6.19.1

This rubber ball system has three working working modes: 1. manual, 2. automatic, automatic, 3, timing.

6.19.2

Preparation before operation:

(1) Rubber ball shall absorb water fully; when necessary, pinch the rubber ball to exhaust the air in the rubber ball; the rubber ball shall be pinched under water and then loosen gently. gently. (2) Put the water -absorbed rubber ball into ball collector, open the manual ball valve of ball screen to exhaust air. 6.19.3

Putting into operation and shutdown of rubber ball

(1) Under manual mode, all the operations are completed by the toggle switch on control panel: Close the power switches of “main switch” of control cabinet, “ball screen”, “rubber ball recirculating pump”, “runner of ball ball collector” and “electrically “electrically operated operated valve”. Turn the “ball screen” toggle switch on control panel to “off”, and indicator light of “ball screen is off” will start flickering; after ball collector is closed in place, the indicator light of “ball screen is off” will be normally on. Turn the “rubber ball recirculating pump” toggle switch on control panel to “start” (or “2” at the right side), check and confirm that rubber ball recirculating pump is starting normally. normally. Turn the “electrically operated valve” toggle switch on control panel to “on”, and indicator light of “electrically operated valve is on” will start flickering; after electrically operated valve is opened in place, the indicator indicator light of “electrically operated valve is on” will be normally on. Open the air vent valve on ball collector to exhaust the air. Operate it for about 10 min to let rubber ball absorb water fully. Turn the “runner” toggle switch on control panel to “on”, and indicator light of “runner is on” will start Steam Turbine Operation Manual Page 189 of 197


flickering; after runner is opened in place, the indicator light of “runner is on” will be normally on and cleaning will start. Cleaning time is generally 3-4hours and then balls are collected. Turn the the “runner” toggle switch on control panel to “off”, and indicator light of “runner is off” will start flickering; after runner is closed in place, the indicator light of “runner is off” will be normally on, then turn the “runner” toggle switch to “stop” to collect to collect balls. The ball collecting time is generally 2-4 hours. When it’s time for collecting balls, turn the “electrically operated valve” toggle switch on control panel to “off”, and indicator light of “electrically operated valve is off” will start fli ckering; after electrically operated valve is closed in place, the indicator light of “electrically operated operated valve is off” will be normally on, after that, turn the “electrically operated valve” toggle switch on control panel to “stop”. Turn the “rubber ball recirculating pump” toggle switch on control panel to “stop” or (“1” at the left side), check and confirm that rubber ball recirculating pump has stopped operating. Turn the “ball screen” toggle switch on control panel to “on” and indicator light of “ball screen is on” will start flickering; after ball collector is closed in place, the indicator light of “ball screen is off” will be normally on. Open the power switches of “main switch” of control cabinet, “ball screen”, “rubber ball recirculating pump”, “ball collector” collector” and “electrically “electrically operated valve”. valve”. (2) Automatic mode: Under automatic mode, turn the start resetting button on control panel to “start” to give a start signal to DLC, the system will start automatic operation for one cycle. After that, the system will wait for next start signal. Return it to original state (ball screen is opened in place, electrically operated valve and ball collector runner are closed in place). Turn the “ball screen” toggle switch on control panel to “off”, and indicator light of “ball screen is off” will start flickering; after ball collector is closed in place, the indicator light of “ball screen is off” will be normally on. Turn the “rubber ball recirculating pump” toggle switch on control panel to “start” (or “2” at the right side), check and confirm that rubber ball recirculating pump is starting normally. normally. Turn the “electrically operated valve” toggle switch on control panel to “on”, and indicator light of “electrically operated operated valve is on” will start flickering; flickering ; after electrically operated valve is opened in place, the indicator light of “electrically operated valve is on” will be normally on. Open the air vent valve on ball collector to exhaust the air. Operate it for about 10 min to let rubber ball absorb water fully. Turn the “runner” toggle switch on control panel to “on”, and indicator light of “runner is on” will start Steam Turbine Operation Manual Page 190 of 197


flickering; after runner is opened in place, the indicator light of “runner is on” will be normally on and cleaning will start. Cleaning time is generally 3-4hours and then balls are collected. Turn the “runner” toggle switch on control panel to “off”, and indicator light of “runner is off” will start flickering; after runner is closed in place, the indicator light of “runner is off” will be normally on, then turn the “runner” toggle switch to “stop” to collect balls. The ball collecting time is generally 2-4 2 -4 hours. When it’s time for collecting balls, turn the “electrically operated valve” toggle switch on control panel to “off”, and indicator light of “electrically operated valve is off” will start flickering; after electrically operated valve is closed in place, the indicator light of “electrically operated valve is off” will be normally on, after that, turn the “electrically operated valve” toggle switch on control panel to “stop”. Turn the “rubber ball recirculating pump” toggle switch on control panel to “stop” or (“1” at the left side), check and confirm that rubber ball recirculating pump has stopped operating. Turn the “ball screen” toggle toggle switch on control panel to “on” and indicator light of “ball screen is on” will start flickering; after ball collector is closed in place, the indicator light of “ball screen is off” will be normally on. Then wait for next start signal. (3) Timing mode When timing mode is started, that is, return to the original state ((ball screen is opened in place, electrically operated valve and ball collector runner are closed in place) and the operating steps are as follows: Turn the mode select switch to “3”→timing relay starts timing→close ball screen when time is up→start rubber ball recirculating pump→open electrically operated valve→delay for several seconds→open ball collector runner→cleaning time relay starts timing (start cleaning) →cleaning time is up→close up→cl ose ball collector runner→ball collecting timing relay starts timing (ball collecting starts) →ball collecting time is up→close electrically operated valve→stop rubber ball recirculating pump→open ball screen→operation is finished→timing relay restarts timing→go to next circulating cycle. 6.19.4

Precautions:

(1) Under manual manual mode, ball screen may collect balls in maximum, maximum, but back flushing flushing must

be opened

at regular intervals (usually about a week) to prevent ball collecting pipe from blocking by sundries. (2) During ball collecting and cleaning process, it’s prohibited to open ball screen so as to avoid misoperation to cause ball running.



Attached: Comparison table of saturated vapor pressure temperature (by pressure) Pressure(MPa)

Temperature( ℃)

Pressure(MPa)

Temperature( ℃)

Pressure(MPa)

Temperature( ℃)

0.001

6.982

0.040

75.89

2.7

228.06

0.0015

13.034

0.050

81.35

2.8

230.04

0.0020

17.511

0.060

85.95

2.9

231.96

0.0025

21.094

0.070

89.96

3.0

233.84

0.0030

24.098

0.080

93.51

3.1

235.66

0.0035

26.692

0.090

96.71

3.2

235.66

0.0040

28.981

0.10

99.63

3.3

237.44

0.0045

31.034

0.12

104.81

3.4

239.18

0.0050

32.90

0.14

109.32

3.5

240.88

0.0055

34.6

0.16

113.32

3.6

244.16

0.0060

36.18

0.18

116.93 116.93

3.7

245.75

0.0065

37.65

0.20

120.23

3.8

247.31

0.0070

39.02

0.25

127.43

3.9

248.84

0.0075

40.32

0.30

133.54

4.0

250.33

0.0080

41.53

0.35

138.88

4.5

257.41

0.0085

42.69

0.40

143.62

5.0

263.92

0.0090

43.79

0.45

147.92

5.5

269.94

0.0095

44.83

0.50

151.85

6.0

275.56

0.010

45.83

0.60

158.84

6.5

280.83

0.011

47.71

0.70

164.96

7.0

285.80

0.012

49.45

0.80

170.42

7.5

290.51

0.013

51.06

0.90

175.35

8.0

294.98

0.014

52.58

1.0

179.88

8.5

299.24

0.015

54.0

1.1

184.06

9.0

303.31

0.016

55.34

1.2

187.96

9.5

307.22

0.017

56.62

1.3

191.6

10

310.96

0.018

57.83

1.4

195.04

11

318.04

0.019

58.98

1.5

198.28

12

324.64

0.020

60.09

1.6

201.37

13

330.81

0.021

61.15

1.7

204.30

14

336.63

0.022

62.16

1.8

207.1

15

342.12

0.023

63.14

1.9

209.79

16

347.32

0.024

64.08

2.0

212.37

17

352.26

0.025

64.99

2.1

214.85

18

356.96

0.026

65.87

2.2

217.24

19

361.44

0.027

66.72

2.3

219.54

20

365.71

0.028

67.55

2.4

221.78

21

369.79

0.029

68.35

2.5

223.94

22

373.68

0.030

69.12

2.6

226.03

Critical 22.115

Critical 374.12



Attached: Comparison table of atmospheric pressure, vacuum and corresponding saturation temperature ts

B 666

H

668

670

672

674

676

670 665 660

678

686

682

684

7.9

11.5

13.6

16.3

9.1

12.7

15.4

17.2

19.4

21.4

7.9

11.5

13.6

16.3

18.6

20.1

22.0

236.8

25.4

655

12.7

15.4

17.2

19.4

21.4

23.2

24.3

25.9

27.3

28.2

650

18.6

20.1

22.0

23.8

25.4

26.4

27.7

29.0

30.2

31.0

645

23.2

24.3

25.9

27.3

28.2

29.4

30.6

31.8

32.6

33.6

640

26.4

27.7

29.0

30.2

31.0

32.2

33.2

33.9

34.8

35.8

635

29.4

30.6

31.8

32.6

33.6

34.5

35.2

36.1

37.0

37.8

630

32.2

33.2

33.9

34.8

35.8

36.7

37.3

38.1

39.0

39.5

625

34.5

35.2

36.1

37.0

37.8

38.4

39.2

40.0

40.5

41.2

620

36.7

37.3

38.1

39.0

39.5

40.2

41.0

41.6

42.1

42.7

615

38.4

39.2

40.0

4.05

41.2

41.9

42.5

43.0

43.6

44.2

610

40.2

41.0

41.6

42.1

42.7

43.4

43.8

44.5

45.1

45.7

605

41.9

42.5

43.0

43.6

44.2

44.9

45.3

45.9

46.4

46.8

600

43.4

43.8

44.5

45.1

45.7

46.0

46.6

47.1

47.5

48.0

595

44.9

45.3

45.9

46.4

46.8

47.3

47.8

48.4

48.7

49.3

590

46.0

46.6

47.1

47.5

48.0

48.6

48.7

49.4

49.9

50.3

585

47.3

47.8

48.4

48.7

49.3

49.7

50.0

50.5

51.0

51.4

580

48.6

48.7

49.4

49.9

50.3

50.8

51.1

51.6

52.0

52.3

575

49.7

50.0

50.5

51.0

51.4

51.7

52.2

52.6

52.9

53.2

570

50.8

51.1

51.6

52.0

52.3

52.7

53.1

53.6

53.8

54.2

565

51.7

52.2

52.6

52.9

53.2

53.7

54.1

54.4

54.8

55.2

560

52.7

53.1

53.6

53.8

54.2

54.6

54.9

55.3

55.7

56.0


Turbine Operation Manual

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