2.VA1-GEDI-00HTF-M-M5-PHL-0001_1

DOCUMENT SUBMISSION SUBM ISSION STATUS: STATUS: FC

1

Feb.17,2012

For Construction

杨

宁

曾少雁

谭学谦

0

Jul.21,2011

For Construction

杨

宁

曾少雁

谭学谦

REV. REV.

DATE

DESCRIPTION

DRAD

CHKD

APPN

OWNER

OWNER’S CONSULTANT

VIETNAM OIL AND GAS GROUP(PVN) EPC CONTRACTOR

POYRY ENERGY LTD EPC CONTRATOR’S CONSULTANT

VIETNAM MACHINERY INSTALLATION CORPPRATION(LILAMA) PROJECT TITLE

VUNG ANG 1 THERMAL THERMAL POWER PLANT 2×600MW 2×600MW M-LOT 5-FLUE GAS DESULPHURIZATION PLANT CONTRACT NO.

100510/LILAMA-GEDI&AEE

DOCUMENT TITLE

FGD SYSTEM SEAWATER SUPPLY SUBSYSTEM System Function Description of Seawater Supply and Absorber System SUBCONTRACTOR

FUNC FUNCTI TION ON

NAME NAME

DRWN

杨

宁

Feb.17,2012

CHKD

曾少雁

Feb.17,2012

APPD

谭学谦

Feb.17,2012

DOCUMENT NO.: VA1-GEDI-00HTF-M-M5-PHL-0001

SIGN SIGN

PAGES: 21

DATE DATE

REV : 1

Vung Ang 1 Thermal Power Plant 2×600 MW-M-Lot 5- SFGD Plant

Table Table of Content

1. SCOPE......................... SCOPE............................................... ............................................. ............................................. ............................................ ............................................1 ......................1 2. PROCESS DESCRIPTION................................ DESCRIPTION..................................................... ........................................... ........................................... ...........................1 ......1 3. GENERAL DESCRIPTION OF OPERATION OPERATION OF SWFGD ............................................ ............................................... ...6 6 4. START START-UP -UP...................... ............................................ ............................................. ............................................. ............................................ ....................................... ................. 11 5. SHUT-DOWN SHUT-DOWN .......................................... ................................................................ ............................................ ............................................. ....................................15 .............15 6. AUTOMATIC AUTOMATIC START START-UP AND SHUT-DOWN OF SPRAY SPRAY PUMPS ................ ........ ................. ................ ....... 18

SYSTEM FUNCTION DESCRIPTION OF SEA WATER SUPPLY SYSTEM

- i -

VA1-GEDI-00HTF-M-M5-PHL-0001


SYSTEM FUNCTION DESCRIPTION OF SEAWATER SUPPLY AND ABSORBER SYSTEM 1. Scope This document is based on the Piping and Instrumentation Diagrams (PIDs) and provides the general system description for Seawater supply system and its auxiliaries of SW-FGD for Vung Ang 1 coal fired power plant in Vietnam. Two (2) Flue Gas Desulphurization (FGD) units are foreseen at this plant. The following specification refers in parts to components of unit 1; however, it can be applied analogously for unit 2. The seawater supply system includes the pump basin, the spray pumps, and the absorber. Reference documents: Document Number

Document Title

VA1-GEDI-01HTF-M-M5-PID-0001

PID Seawater supply unit 1


PID Seawater spray pump A-D unit 1


PID Seawater supply unit 2


PID Seawater spray pump A-D unit 2

VA1-GEDI-01HTD-M-M5-PID-0001

PID Absorber unit 1

VA1-GEDI-02HTD-M-M5-PID-0001

PID Absorber unit 2

2. Process description 2.1 Pump statio n A common pump basin is provided outside the spray pump house to lead seawater to both unit aeration basins. Four spray pumps per unit are provided in the spray pump house to elevate the seawater from the pump basin to the absorption zone of the absorber. Each pump is serving one absorber spraying level. One pump is a stand-by unit and will be started only if one of the other pumps fails. Two spray pumps shall be started in minimum before takeover of flue gas to avoid problems in case of a failure of one spray pump. SYSTEM FUNCTION DESCRIPTION OF SEA WATER SUPPLY SYSTEM

-1-



Operation of spray pumps without Booster up Fan in operation shall be minimized to max. 10 minutes in order to avoid salt incrustations on the GGH heating elements. For start-up the spray pumps should be started one after the other to let equalize the seawater level in the pump basin. Also, during shut-down one Spray pump after the other should be stopped. During automatic operation three Spray Pumps will be started. The operator can pre-select the stand-by Spray Pump via a Pre-Selection Module within PLC. In case of low boiler load operator can decide to operate the absorber with only one or two Spray Pumps under consideration that the SO 2 emission limit values are safety ensured. Each pump motor is equipped with an anti-condensation heating. The heating is automatically switched OFF when the pump has started and automatically switched ON when the pump has stopped. Spray Pumps will be switched off via protection off signals, if the level in the pump basin, or if the level in the absorber, or if the discharge pressure is too low, and/or other failure signals from pump or motor are valid.

2.2 Absorber sys tem The SOx absorption takes place in a spray tower Absorber. The Absorber size is dia.16m x 29.82m (total height) and the nominal level is 2.6m from the bottom. In the top part of the absorber the water droplets are removed by the Mist Eliminator. A two stage horizontal type mist eliminator will be provided. For the mist eliminator in Absorber, a special flushing system is installed. The mist eliminator is flushed with the common service water. Similar to the Service Water system a minimum pressure limiter ensures a minimum flow back to the Service Water Tank, if no flushing water is needed for the mist eliminator. Also, a pressure indicator, 10HTQ50 CP001, downstream of each pump group ensures a certain operation pressure and starts the second pump as soon the pressure drops under a certain value. Flushing ME needs to operate once a week or as the alarm difference pressure of mist eliminator is active. It’s an off-line system. SYSTEM FUNCTION DESCRIPTION OF SEA WATER SUPPLY SYSTEM

-2-



2.3 Process mediu m data Medium in Pump Basin

Seawater

Design Density

Remark

1032 kg/m³

Average solid content

0,01 g/l

Max. solid content

200 g/l

Max. chloride content

25 g/l

pH value

5,5-8,3

Temperature

7,5 – 40,4 °C

2.4 Pump Basin Size The pump basin size is 49m x 17m x 8.2m (length x width x height) and the nominal level is 6m from the basin bottom.

2.5 Seawater Spr ay Pumps data 2.5.1 Table 1 No.

Seawater Spray Pump A to D

Item

1

Denomination

2

Number per Unit

Unit

Pump data Seawater Spray Pump 4 ( 3 duty +1 assistant) * 10HTF11AP001 ; 20HTF11AP001 10HTF12AP001 ; 20HTF12AP001

3

KKS Code 10HTF13AP001 ; 20HTF13AP001 10HTF14AP001 ; 20HTF14AP001

4

Vendor

Xiangfan 525 Pump Industry

5

Type

6

Type series

7

Location

8

Ambient

ºC

20

9

Medium Temp.

ºC

7.5 – 40.4

Co., Ltd.

Horizontal suction and vertical discharge LC 700 / 900 II Indoors / in Pump House


-3-



No.

Item

Unit

Pump data

10

Flow rate

m3/h

8000 20.3 ; 20.1 22.1 ; 21.9

11

Total head

m 23.9 ; 23.7 25.7 ; 25.5 434 ; 432

Impeller speed 12

449 ; 447 r/min

(only for information)

460 ; 458 472 ; 470

13

NPSHr

m

6

14

Efficiency

%

86% 531 ; 525 578 ; 572

15

Shaft power

kW 625 ; 619 672 ; 667

16

Impeller diameter

mm

900

17

Impeller slip velocity

m/s

20.4 / 21.1 / 21.6 / 22.1

18

Sealing

19

Bearing lubrication

Grease

20

Driving

Gearbox

Mechanical

Siemens Automation and Drives Group Vendor (Flender) Type

H1SH09B

Cooling 21

Fan & Cooling coil

Motor data

21.1

Vendor

21.2

Type


Xiangtan Motor Group Co., Ltd. YKK500-4

-4-



No.

Item

Unit

Pump data

21.3

Power

kW

630 / 710 / 710 / 800

21.4

Pole

21.5

Protection

21.6

Sync / full load speed

21.7

V /Ph /Hz

21.8

Cooling

22

4 IP54 r/min

1488 10KV / 3 / 50HZ IC616

Material specification

22.1

Casing and cover

ASTM A890-5A / 2507

22.2

Impeller

ASTM A890-5A / 2507

22.3

Shaft

ASTM A890-5A / 2507

22.4

Shaft sleeve

ASTM A890-4A / 2205

22.5

Mechanical seal

22.6

Bolts for installation

316L or CS hot dipped galvanized

22.7

Anchor Bolts

316L or CS hot dipped galvanized

22.8

Base steel structure

23

Noise (sound pressure level)

24

Outlines L x W x H

25

Maintenance

SiC

CS with anti-corrosion painting 85 dB(A) at 1 meter off the proof hood 6500x2000x2570

Maximum lift weight

ton

5

Maximum height

m

5 from the base plate

Note: *) 1 of 4 pumps is stand-by to be selected by operators. The spray pump B was recommended for the stand-by one. The stand-by pump should be operated at least 8h per week.


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3. General descr ipt ion of Operation of SWFGD (Common descript ion fo r all systems) 3.1 General Rules f or Start-Up and Shut-Down The term "Start-Up" shall mean to place a system that is "Ready for Operation" into the trouble-free "On-Line" mode. The operation personnel must check and confirm that the following conditions have been met before each system is placed "On-Line": •

All rules and regulations concerning accident prevention have been observed.

•

All safety instructions concerning the handling of chemicals have been observed.

•

The commissioning or the regular shut-down of the system has been properly

completed and the system is "Ready for Operation". •

All start-up requirements of the system have been met and all notes and remarks

applicable to the system have been observed. •

All ducts, basins and pipes have been checked and are "Ready for Operation".

•

All manholes and inspection holes are closed.

•

The system is clean and completely tight.

•

The electrical systems are "On-Line"

•

All machines are "Ready for Operation".

•

All valves are "Ready for Operation".

•

All instruments are "Ready for Operation".

•

All local control panels are "Ready for Operation".

•

The control system, PLC is "On-Line".

•

All automatically controlled permissive and trips have been activated.

•

All control loops are "Ready for Operation".

•

All automatic control units are "Ready for Operation".

•

All automatic sequencers that are used during start-up are "Ready for Operation"

and in the modes stated in the document. •

All maintenance requirements have been met.


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3.2 Start -Up In general the start-up procedure of SWFGD has to be done in a certain sequence manually. General Preconditions for the start up of the FGD are: - Boiler is in constant load - FGD in Bypass operation - Soot free flue gas - Acceptable flue gas temperature - Acceptable ESP operation - Stable Seawater from condenser conditions and flow to aeration basin - All valves in position as listed in the valve list. Especially as follows: i) Absorber Vent Valve in OPEN position FGD Start up s teps

1) Consumables Systems have to be available - Instrument Air System available - Service Air System available (for GGH each Unit) - CCCW System available (for BUF & Spray Pumps each Unit) - Service Water System available - Steam System available (for GGH each Unit) - Electric Power connection of each system available. 2) SWFGD PLC and Measurement systems have to be in action - SWFGD Measurements available - SWFGD Liquid Analyzer System in operation (for pH and DO) - SWFGD PLC system in operation 3) Common Systems have to be available - Drain Pit Pump (Automatic Start/Stop control via SWFGD PLC activated) - Service Water Pump available - Service Water Tank (Automatic Start/Stop control via SWFGD PLC activated) 4) Aeration Basin System has to be in operation - Oxidation Air Blower system (4 of 5) in operation 5) GGH System - GGH Standstill Conservation has to be out of service - GGH Seal Air System has to be started - GGH Section Drive Unit (Automatic Start/Stop control via SWFGD PLC activated) SYSTEM FUNCTION DESCRIPTION OF SEA WATER SUPPLY SYSTEM

-7-



- GGH Blowing with Steam has to be set in automatic operation - GGH Cleaning with HPW available (only be started by operator on local panel) 6) Spray Pumps and Absorber System has to be in operation - Absorber Mist flushing available - Spray Pump System (3 of 4) in operation 7) Flue Gas Ducting System - Damper Seal Air System has to be in operation - BUF Auxiliary Equipment has to be in operation - GGH RDU has to be started - Clean Gas damper has to be open - Absorber Vent Valve has to be closed - Raw Gas damper has to be open - BUF with main motor has to be in operation - Pressure Control BUF has to be set in automatic operation - Bypass damper can be closed

3.3 A short s hut down A short shut down procedure of the FGD plant consists of the following steps, which are the same as the start up procedure but in reverse sequence: 1) Flue Gas Ducting System - Bypass damper has to be open - Damper Seal Air System remain in operation - Pressure Control BUF has to be set to manual - BUF has to be out of operation (main motor stopped) - BUF Auxiliary Equipment remain in operation (decided by operator) - Raw Gas Damper has to be closed - Absorber Vent Valve has to be open - Clean Gas Damper has to be closed 2) Spray Pumps and Absorber System remain in operation - Absorber Mist flushing remain available - Spray Pumps remain in operation 3) GGH System - GGH Rotor with Seal Air System remain in operation (decided by operator) - GGH Section Drive Unit (Automatic Start/Stop control via SWFGD PLC remain in SYSTEM FUNCTION DESCRIPTION OF SEA WATER SUPPLY SYSTEM

-8-



operation) - GGH Blowing with Steam has to be set to manual - GGH Cleaning with HPW remain available (only be started by operator on local panel) - GGH Standstill Conservation out of operation 4) Aeration Basin System remain in operation - Oxidation Air Blowers remain in operation 5) Common Systems - Drain Pit Pump (Automatic Start/Stop control via SWFGD PLC remain in operation) - Service Water Pump remain available - Service Water Tank (Automatic Start/Stop control via SWFGD PLC remain in operation) 6) SWFGD PLC and Measurement systems - SWFGD Liquid Analyzer System remain in operation (for pH and DO) During a short shut down of the SWFGD, shut down step 1 can be stopped and the rest of the FGD system will be kept in service. The spray pumps should not be in operation during long Flue Gas Duct Bypass operation periods, as the sea water mist from the absorber can raise in reverse direction back into the GGH.

3.4 The planned shut dow n The planned shutdown procedure of the FGD plant consists of the following steps, which are the same as the start up procedure but in reverse sequence: 1) Flue Gas Ducting System - Bypass damper has to be open - Damper Seal Air System remain in operation - Pressure Control BUF has to be set to manual - BUF has to be out of operation (main motor stopped) - BUF Auxiliary Equipment remain in operation (decided by operator) - Raw Gas Damper has to be closed - Absorber Vent Valve has to be opened - Clean Gas Damper has to be closed 2) Spray Pumps and Absorber System can be stopped - Absorber Mist flushing has to be out of operation SYSTEM FUNCTION DESCRIPTION OF SEA WATER SUPPLY SYSTEM

-9-



- Spray Pumps can be stopped 3) GGH System - GGH Rotor with Seal Air System remain in operation (decided by operator) - GGH Section Drive Unit (Automatic Start/Stop control via SWFGD PLC remain in operation) - GGH Blowing with Steam has to be set to manual - GGH Cleaning with HPW remains out of operation (only manually!!) - GGH Standstill Conservation can be started by operator (only manually!!) 4) Aeration Basin System - Oxidation Air Blowers can be stopped (at least 15 min after Spray Pumps stopped) 5) Common Systems - Drain Pit Pump (Automatic Start/Stop control via SWFGD PLC remain in operation) - Service Water Pump remain available - Service Water Tank (Automatic Start/Stop control via SWFGD PLC remain in operation) 6) SWFGD PLC and Measurement systems - SWFGD Liquid Analyzer System remain in operation (for pH and DO) In order to avoid low temperature corrosion, sealing fans for Damper and GGH with electric heater have to run at least 24 hours later, even if GGH rinsed by the low-pressure water. If the flue gas ducting has not been dried completely, extending the drying time is recommended.

3.5 SWFGD emergency shut-down In order to avoid damages to the SWFGD plant, an emergency shut down (ESD) conditions shall be implemented. The ESD conditions protect the plant from being endangered by offset operating conditions. It shall be fully automated and designed to handle all critical events, which might occur in the plant. The ESD conditions as following will result in Bypass Damper Fast Speed Open: -

SWFGD electricity lost, the SWFGD system protection stop

-

The Booster Up Fan ( 10HTC10AN001) is in trip

-

Instrument air pressure (10HTX01CP001) lower than 0.4MPa

-

In normal running, raw gas damper (10HTA05AA201) closed or clean gas damper (10HTA20AA201) closed


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4. Start-Up 4.1 Precondi tio ns for Start-Up System is "Ready for Operation" after the general start-up conditions have been fulfilled. Furthermore the following conditions should be checked before each start-up: •

All consumable systems are “On-Line”

•

SWFGD PLC and instrumentations are in service

•

Drain Pit Pump sequence and Service Water Pump sequence are in service

•

Oxidation Air Blowers sequence is in service

•

All valves in position as listed in the valve list

•

All basin are filled-up with seawater

•

Flue Gas Ducting sequence is ready to be started as soon as Spray Pumps are in

operation

4.2 Manual Procedure The manual start-up of the system shall be done in the same way as per automatic procedure, according to function logic diagram.

4.3 Automati c Procedure 4.3.1 Release Condi tions 4.3.1.1 Spray Pu mp A (10HTF11AP001) The start-up sequence of the Sub Function Group Module Spray Pump A can be started only, if the following release conditions are fulfilled: No.

Logic

1

1oo2

KKS

Designation

Condition

10HTQ01CL901 L 1 out of 2 Pump Basin

L > LL

00HTQ90CT001 P CCCW Supply

P>L

AND 2


- 11 -



The release conditions for Spray Pump B (10HTF12AP001), Spray Pump C (10HTF13AP001) and Spray Pump D (10HTF14AP001) are analogous.

4.3.1.2 Sub-Functi on Group – ME 1A Flus hing (10HTQ50 EC001) It is a discontinuous operation. The start-up sequence of the Sub Function Group Module ME Flushing (abbr. Mist Eliminator) can be started only, if the following release conditions are fulfilled: No.

Logic

1

KKS

Designation

Condition

10HTC10AN001 BUF

ON

AND PSM 2

1oo2

ON Service Water Pump 00HTQ21AP001 Service Water Pump A

ON

00HTQ21AP002 Service Water Pump B

ON

10HTA05CT901

T
AND 3

NOT

T Raw Gas Inlet

AND 4

NOT

10HTQ50CP001 P Service Water Before ME

P
AND 5

Once a week


- 12 -



4.3.2 Start-up sequenc e 4.3.2.1 Spray Pu mp A (10HTF11AP001) The start-up sequences for Spray Pump B (10HTF12AP001), Spray Pump C (10HTF13AP001) and Spray Pump D (10HTF14AP001) are analogous. Status:

Spray Pump A, 10HTF11AP001 is "Ready for Operation"

No. Action/Adjustment

KKS

Designation

Check Box

Shut Off Valve Suction Side 1

OPEN

10HTF11AA201

OPEN Spray Pump A

10HTF11AN001 2 3

Motor Cooling Air Fan A1

ON

OPEN

ON

10HTF11AN002

Motor Cooling Air Fan A2

10HTF11AP001

Spray Pump A

ON

10HTF11CP001

P Spray Pump A

P > LL

Start Time Delay

60 sec

AND P > MIN(LL) AND

Status:

Spray Pump A, 10HTF11AP001 is "On-Line"

Remarks: The Standstill Heating Spray Pump A (10HTF11AH001) will be switched ON and OFF automatically via switchgears (switched ON if pump is OFF, switched OFF if pump is ON).

4.3.2.2 Sub-functi on Group - ME 1A Flushi ng The mist eliminator has three stages flushing nozzles, 1A, 1B and 2A. Each stage flushing has six flaps, which 1A flaps are motorized and others are manul. Status:

Service Water Flap ME INL, 10HTQ50AA201 Flushing Flap ME 1A-1, 10HTQ51AA201; Flushing Flap ME 1A-2, 10HTQ51AA202 Flushing Flap ME 1A-3, 10HTQ51AA203 Flushing Flap ME 1A-4, 10HTQ51AA204


- 13 -



Flushing Flap ME 1A-5, 10HTQ51AA205 Flushing Flap ME 1A-6, 10HTQ51AA206 all flaps are "Ready for Operation"

No. Action/Adjustment

KKS

Designation

Check Box

1

CLOSE

10HTQ50AA201 Service Water Flap ME INL

CLOSED

2

OPEN

10HTQ51AA201 Flushing Flap ME 1A-1

OPENED

3

OPEN


OPENED

4

AND

5

OPEN


OPENED

6

CLOSE


CLOSED

7

AND

8

OPEN


OPENED

9

CLOSE


CLOSED

10

AND

11

OPEN


OPENED

12

CLOSE


CLOSED

13

AND

14

OPEN


OPENED

15

CLOSE


CLOSED

16

AND

17

OPEN


OPENED

18

CLOSE


CLOSED

19

AND

20

CLOSE


CLOSED

21

CLOSE


CLOSED

Status:

Time Delay

Time Delay

Time Delay

Time Delay

Time Delay

Time Delay

60sec

60 sec

60 sec

60 sec

60 sec

60 sec

SFG - ME 1A Flushing is "END".


- 14 -



5. Shut -down 5.1 Preconditi ons f or Shut-down of an i ndividual Spray Pump The following conditions should be checked before each shut-down of an individual Spray Pump: The SWFGD SO2 removal efficiency will significantly decrease as soon as one

•

Spray Pump will be stopped. Therefore shut-down of Spray Pumps is allowed only in case of extremely low SO 2 load in the raw flue gas.

5.2 Preconditi ons f or Shut-down o f all Spray Pumps The following conditions should be checked before shut-down of all Spray Pumps: FGD Flue Gas Ducting shall be in bypass mode (Bypass Damper opens, Raw Gas

•

Damper and Clean Gas Damper closed).

5.3 Manual Procedure The manual shut-down of the system shall be done in the same way as per automatic procedure, according to function logic diagram.

5.4 Automati c Procedure 5.4.1 Protecti on Off 5.4.1.1 Spray Pu mp A (10HTF11AP001) The following protection off conditions result in an automatic shut-off of Spray Pump A (10HTF11AP001). No.

Logic

KKS 10HTF11AA201

1

Designation

Condition

Shut Off Valve Suction Side Spray NOT OPEN Pump A

OR 10HTF11AP001

2 AND

Spray Pump A

ON

Start Time Delay

10 sec


- 15 -



No.

Logic

KKS

Designation

Condition

AND

10HTF11CP001

P Spray Pump A

P < LL

10HTQ01CL901

L 1 out of 2 Pump Basin

L < LLLL

10HTD01CL901

L 2 out of 3 Absorber

L > HH

10HTF11CT601

T Motor Winding 1 Spray Pump A

T > HH

10HTF11CT602


T > HH

10HTF11CT603


T > HH

10HTF11CT604


T > HH

10HTF11CT605


T > HH

10HTF11CT606


T > HH

OR 3

1oo2 OR

4

2oo3 OR

5 OR 6 OR 7 OR 8 OR 9 OR 10 OR

T Motor Bearing Drive End Spray 11

10HTF11CT607

T > HH Pump A

OR T Motor Bearing Non Drive End 12

10HTF11CT608

T > HH Spray Pump A

OR T Pump Bearing Drive End Spray 13

10HTF11CT609

T > HH Pump A

OR 14

10HTF11CT610

T Pump Bearing Non Drive End


- 16 -

T > HH



No.

Logic

KKS

Designation

Condition

Spray Pump A OR 15

10HTF11CT611

T Pump Body Oil Spray Pump A

T > HH

10HTF11CT612

T Gear Box Oil Spray Pump A

T > HH

OR 16

OR

[!!!Only for Pump B/ C/ D] 10HTF12/13/14

17

P Spray Pump X

p
CP101 The shut-off conditions for Spray Pump B (10HTF12AP001), Spray Pump C (10HTF13AP001) and Spray Pump D (10HTF14AP001) are analogous.

5.4.2 Shut-down sequence 5.4.2.1 Spray Pu mp A (10HTF11AP001) The shut-down sequence can be applied correspondingly for Spray Pump B (10HTF12AP001),

Spray

Pump

C

(10HTF13AP001),

and

Spray

Pump

D

(10HTF14AP001). Status:

Spray Pump A, 10HTF11AP001 is "On-Line"

No. Action/Adjustment KKS

Designation

Check Box

1

STOP

Spray Pump A

OFF

2

WAITING STEP

balancing time

60 sec

10HTF11AP001

Shut Off Valve Suction Side 3

CLOSE

10HTF11AA201

CLOSED Spray Pump A

4

WAITING STEP

5

STOP

60 sec 10HTF11AN001

OFF 10HTF11AN002

Status:

Motor Cooling Air Fan A1 Motor Cooling Air Fan A2

Spray Pump A, 10HTF11AP001 is "Off-Line"


- 17 -



6. Auto matic Start-up and Shut-down o f Spray Pumps 6.1 Pre-Selection f or Au tomati c Start-up During automatic operation three Spray Pumps are in continuous operation. One Spray Pump will be a stand-by unit. Via Pre-Selection Module Spray Pumps 10HTF10EE001 the operator can pre-select the pump which shall be in stand-by: Pre-selection 1: Spray Pump A Pre-selection 2: Spray Pump B Pre-selection 3: Spray Pump C Pre-selection 4: Spray Pump D If Spray Pump B is pre-selected (preferred) the start-up sequence for automatic spray pump start-up is: - Sub-Function Group for Spray Pump D, 10HTF14EC001 (as first pump) - Sub-Function Group for Spray Pump C, 10HTF13EC001 (as second pump) - Sub-Function Group for Spray Pump A, 10HTF11EC001 (as third pump) Sub-Function Group for Spray Pump B (10HTF12EC001) will be the stand-by unit in this case. This Sub-Function Group will be started automatically if one of the other pumps fails. Note: The operator shall take care that during one year of operation the running times of all four pumps are nearly the same; nevertheless Spray Pump B is the preferred stand-by pump.

6.2 Automati c Start-up The automatic start-up of Sub-Function Group Spray Pump A (10HTF11AP001), Sub-Function Group Spray Pump B (10HTF12AP001), Sub-Function Group Spray Pump C (10HTF13AP001) and Sub-Function Group Spray Pump D (10HTF14AP001) will be done via Function Group Spray Pumps (10HTF10EC001) and done pre-selection.


- 18 -



6.2.1 Release Condi tions The start-up sequence of the Function Group Spray Pumps can be started only if the following release conditions are fulfilled: No.

Logic

1

1oo2

KKS

Designation

Condition

10HTQ01CL901 L 1 out of 2 Pump Basin

L>L

6.2.2 Start-up sequenc e The following start-up sequence for Pre-selection 2 (Spray Pump B is standby) can be applied correspondingly for the other pre-selections, too.

Status:

Spray Pump A (10HTF11AP001), Spray Pump B (10HTF12AP001), Spray Pump C (10HTF13AP001) and Spray Pump D (10HTF14AP001) are "Ready for Operation"

No. Action/Adjustment 1

START

KKS

Designation

Check Box

10HTF14EC001

Sub-FG Spray Pump D

ON

10HTF13EC001

Sub-FG Spray Pump C

ON

10HTF11EC001

Sub-FG Spray Pump A

ON

10HTF12EC001

Sub-FG Spray Pump B

ON

IF SUB-FG IS ON OR IF PUMP FAILS 2

START IF SUB-FG IS ON OR IF PUMP FAILS

3

START IF PUMP FAILS START

4

STAND-BY SUB-FG


- 19 -



Status:

Spray Pump C, Spray Pump D and Spray Pump A are "On-Line". Or: One of the three pre-selected Spray Pumps fails and Spray Pump B is "On-Line" too.

6.3 Automatic Shut-down The automatic shut-down of Sub-Function Group Spray Pump A (10HTF11AP001), Sub-Function Group Spray Pump B (10HTF12AP001), Sub-Function Group Spray Pump C (10HTF13AP001), and Sub-Function Group Spray Pump D (10HTF14AP001) will be done via Function Group Spray Pumps (10HTF10EC001).

Status:

Spray Pump A (10HTF11AP001), Spray Pump C (10HTF13AP001), and Spray Pump D (10HTF14AP001) are "On-Line". Spray Pump B (10HTF12AP001) is “Stand-by”

No. Action/Adjustment 1

STOP

KKS

Designation

Check Box

10HTF11EC001

Sub-FG Spray Pump A

OFF

10HTF12EC001

Sub-FG Spray Pump B

OFF

10HTF13EC001

Sub-FG Spray Pump C

OFF

10HTF14EC001

Sub-FG Spray Pump D

OFF

IF SUB-FG IS OFF 2

STOP IF SUB-FG IS OFF

3

STOP IF SUB-FG IS OFF

4

STOP

Status:

All Spray Pumps are "Off-Line"


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6.4 Reduced SO2 Load During automatic operation three Spray Pumps are in operation. In case of low boiler load, i.e. in case of extremely low SO2 load in the raw flue gas, the operator may decide to operate the absorber with only one or two Spray Pumps. In this case operator has to set the Function Group Spray Pumps (10HTF10EC001) in manual mode and has to stop a Sub-Function Group for one or two Spray Pumps. As soon as clean gas SO2 concentration gets unacceptable high the operator must restart one or two Spray Pumps by the related Sub-Function Group module.


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2.VA1-GEDI-00HTF-M-M5-PHL-0001_1

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