Modul belajar Animasi flash berbahasa indonesia, dipersembahkan oleh SADANA Studio. Pengenalan, latihan, teori dan praktek, bahkan tips dan trik lengkap dibahas pada terbitan kedua ini. semoga berm...
Descripción: simulation of crude distillation unit using hysys
Flash distilasi (kadang-kadang disebut "keseimbangan distilasi") adalah teknik pemisahan satu tahap. Sebuah umpan campuran cairan dipompa melalui pemanas untuk menaikkan suhu dan entalpi campuran. ...Full description
FlashDescripción completa
ATMOSPHERIC FLASH TANK Co nd en s at et e mp mp er at u r e si nh i g hp r e ss ur es t e am s y s t e ms ge ms ner a l l ya r e on l ys l i g ht l yl e s st h an t h es at u r a t e d t e mp mp er a t u r eo ft h es t e am. Wh Wh en h o tc o nd en s at e sa r ed i s c h a r g ed i n t ol o we r p r e s s u r ea r e as ,c o n d en s a t e t emp er at ur ei mme di at el ydr op st ot hes at ur at edt emper at ur eo ft hel o wpr e ss ur ear ea.Ast her e sul toft hedr o pi n t emp er at ur e,hea tr el ea sede v apor at esapor t i onoft h ec onde ns at e,gene r at i ngfl as hs t eam.T or e t ur nc onden sat et o t heboi l ero rt odi s c har gei tt ot hes ewer ,i ti snec es s ar yt os epar a t efl as hs t e am f r om t hec on de ns at e.Th i si s a cc omp l i s he db ydi s c har g i ngc on de ns at et hr oug hs t eam t r apsi nt oav ent edt an k,r ef er r edt oa safl as ht an k.Fl as h s t e am p r o du c e di nt h efl a s ht a nkma yb ev e n t e dt ot h ea t mo s p he r eo rp i p edt oal o wp r e s s u r ema i n .Co nd en s a t e r e mai ma ni n gma yt h enb er e t ur nedt ot h eboi l erordi s c har g edt odr ai n.
1. Condensate from various points of operation enters the ash tank at relatively high pressure. As the condensate enters the low pressure pressure ash tank, part of the condensate ashes into steam. The tangential inlet of the ash tank t ank forces the incoming condensate into a funnel type motion forcing the denser entrained water to the outside of the ash tank to collect on the walls and fall to drain. This leaves dry low pressure steam in the centre of the ash tank to rise and exit the ash tank through the vent. 2. The ash steam exits through the vent at the top of the tank and is either vented to atmosphere or piped to a low pressure line for use in low pressure steam applications. . The condensate is discharged through the !ottom of the ash tank. "hen piping ash steam into a low pressure steam line and discharging condensate directly to a return line, it is important that the condensate has enough of a pressure di#erential to overcome any !ack pressure from the retur return n line. line. Ad Addit dition ionall ally, y, the the place placemen mentt of a steam steam trap trap after after the ash ash tank tank would would !e necessary to prevent !low through of steam. $f a steam trap is necessary, an inverted !ucket %$&' trap is suggested. The trap should !e si(ed with a )1 safety factor. $f !ack pressure exceeds tank pressure, the use of a reservoir and pumping trap may !e necessary to ensure proper drainage. $f the ash tank is held at atmospheric pressure, the use of a steam trap on the discharge line would not !e necessary since the ash steam is !eing vented to atmosphere. atmosphere. The condensate, in this case, would !e drained !y gravity to a vented receiver which would !e placed !elow the level of the ash tank.
*ow vacuum is created+ &asic vacuum created in the -T exhaust side is !ecause of condensing process. -hase change is occurring at the exhaust side i.e. conversion of steam into water. peci/c volume of water is much lower than the steam. *ence when the condensing process happens, volume of steam reduces and !asic vacuum is created. Apart from this, vacuum pumps are provided to remove non condensa!le gases0air ingress which reduces heat transfer e#ectiveness. "hy vacuum is created+ To improve -T cylinder eciency thus the load0work done shall !e improved. 3#ect of over vacuum+ $t causes su!4cooling e#ect where hot well temperature reduces more than design which re5uired to !e added in !oiler leads to heat loss. Also ow accelerated erosion in -T last stages. 3#ect of under vacuum+ -T eciency reduction which causes lesser work done leads to reduced load output. *ow is the washing of tur!ine !lades carried out with the condensate+ The washing is carried out with the condensate at 1667C. The tur!ine is cooled or heated up to 1667C and /lled with the condensate via a tur!ine drain. The rotor is turned or !arred !y hand and the condensate is drained after 2 to 8 hours. $t is then again /lled with the condensate at 1667C %!ut up to the rotor centre4level', the rotor is rotated and the condensate is drained after sometime. This process is repeated several times. *ow is tur!ine !lade washing with wet steam carried out+ "et steam produced usually !y in9ecting cold condensate into the superheated steam, is introduced to the tur!ine which is kept on running at a!out 26: of nominal speed. ;or !ackpressure tur!ine the exhaust steam is let out into the open air through a gate valve. ;or a condensing tur!ine, the vacuum pump is kept out of service while cooling water is running, with the e#ect that the entering cooling steam is condensed. The condensate is drained o#. The washing steam condition is gradually ad9usted to a /nal wetness of 6.< to 6.<=. >ote, it is important) >ot to change washing steam temperature !y 167C0min,
To keep all tur!ine cylinder drains open.
If deposits form, they are removed y !ashi"# the $ades !ith !et steam !here %po" !ater so$%$e deposits are tra"sferred i"to the !ashi"# #ivi"# rise to partia$ !ashi"#& o'
