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Refrigerated Gas Plant

Module 3

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Case m phng M phng hot ng ca 1 nh my x l kh dngcng ngh lm lnh Nhim v: xc nh nhit vn hnh ca LTS (LowTemprature Separator) sao cho t spec nhit im sng H.C ca kh thng phm < - 15oC 6000 kPa.Kh c lm mt 2 giai on, trao i nhit vi khthng phm v dng h thng lm lnh bngPropane

S dng Unit Balance nh gi nhit imsng ca kh ti 6000 kPa

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Mc tiu kho hc M phng hot ng ca HeatExchanger

ng dng cc b iu khin logic S dng cng c Case Study

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Yu cu Phi hc qua Module 2 :

Bit cch to Fluid Package To Stream To cc Units

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S cng ngh

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Xy dng case m phng nh ngha Fluid Package

S dng Peng Robinson EOS Cc cu t N2, H2S, CO2, C1, C2, C3, i-C4, n-C4, i-C5, n-C5, C6, C7+ v H2OBt u 1 case mi, to mi FluidPackage

Hocimport Fluid Package t Gasplant c lu trong Module 1

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To cc thnh phn c bn To dng Feed

Name To RefrigTemperature 15oC

Pressure 6200 kPa

Flow rate 1440 kgmole/hr

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To cc thnh phn c bn Thnh phn dng Feed

N2 0.0066 n-C4 0.0101

H2S 0.0003 i-C5 0.0028CO2 0.0003 n-C5 0.0027C1 0.7575 C6 0.0006C2 0.1709 C7+ 0.0001C3 0.0413 H2O 0i-C4 0.0068

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To cc thnh phn c bn To Heat Exchanger

Tnh ton cn bng nng lng v vtcht Tnh ton nhit , p sut, dng nnglng (bao gm c heat loss, heat leak),dng vt cht v UA. C th dng m phng cc loi thit

b trao i nhit trn thc t: Tube -Shell,Compact Exchanger, Kettle reboiler Tnh ton design hoc rating

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To cc thnh phn c bn To Heat Exchanger (Connections )

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To cc thnh phn c bn To Heat Exchanger (Parameters )

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To cc thnh phn c bn To Heat Exchanger (Models )

Weighted: Qu trnh trao i nhit c chianh lm nhiu on tnh ton. LMTD v UA sc tnh cho mi on v LTMD/UA ca thit bs bng tng cc on. Model ny ch c sdng khi thit b trao i nhit c cu hnhCounter-CurrentEndpoint: Model ny n gin ch tnh tonLMTD/UA da trn iu kin u vo/ra. i vicc qu trnh trao i nhit khng lm thay itrng thi pha v Cp trong iu kin trao i lgn nh khng i th Model ny c th p dng

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To cc thnh phn c bn To Heat Exchanger (Specs )

Khi m phng Heat exchanger c nhiun s cha bit (flows, temperatures) Khi cung cp thng tin v 1 n s, s bct do ca h thng HE s gim i 1 gii c h phng trnh, s n sphi bng s lng cc specs c cung

cp. Khi s bc t do bng 0 Case m phng: 2 specs Heat Balance& Min Approach

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To cc thnh phn c bn To Heat Exchanger (Specs )

Heat Balance = 0 (default)Min Approach = 5oC l chnh lch nhit ti thiu gia dng nng v dng lnh

Vo tab Specs/AddFlowrate ca Gas to Chiller?

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Hon thin Simulation Thm Cooler vi cc thng tin:

Name Chiller

Feed Stream Gas to Chiller

Product Stream Gas to LTS

Energy Stream Chiller QPressure drop 35 kPa

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Hon thin Simulation Thm Separator vi cc thng tin:

Name LTS

Feed Stream Gas to LTS

Vapor Outlet LTS Vap

Liquid Outlet LTS Liq

Cc thng tin g cn Hysys tnh ton c LTS?

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Hon thin Simulation B sung nhit dng Feed LTS: Trong phn tip theo s s dngAdjust operation iu chnh nhit dng feed vo LTS. Hin ti t nhit dng Feed voLTS l -20 oC

p sut ca Sale Gas l bao nhiu? Nhit ca Sale Gas l bao nhiu?

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Balance OperationCng c tnh ton cn bng vtcht/nng lng

Mole: Cn bng thnh phn mole v lulng Mass: Cn bng thnh phn khi lngv lu lng Heat:

Mole and Heat:General:

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Balance OperationSale Gas: c Hysys tnh ton vkhng th thay i

Khng th tnh c nhit Dewpoint 6000 kPa Dng Mole Balance cho php to 1stream c thnh phn ging SGnhng khng c Vf, T v P

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Balance OperationTo Unit Balance t Object Palette Cung cp cc thng tin:

Type: MoleInlet Stream: Sale GasOutlet Stream: HC Dewpoint

t p sut ca HC Dewpoint l 6000 kPa(875 psia)t Vapor Fraction tnh nhit imsng Dewpoint temperature l bao nhiu?

t spec hay khng?Lm th no thay i gi tr dewpoint?

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Adjust OperationThay i gi tr ca 1 thng s (bin clp) t gi tr mong mun ca thng skhc (bin ph thuc)

Ca s giao dinca Unit Adjust

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Adjust OperationAdjusted Variable/Select Var Object/Gas to LTSVariable list/Temperature

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Adjust OperationTarget Variable/Select Var Object/HC DewpointVariable list/Temperature

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Adjust OperationSpecified Target Value: -15oC

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Adjust OperationParameters: Gi nguyn cc gi tr mc nh

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Adjust OperationNhn Start bt u tnh ton Vo Monitor xem qu trnh tnh

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S dng Case Study Theo di s ph thuc ca cc thngs vo 1 thng s khc Adjust tnh ton 1 gi tr Case Study tnh ton 1 gii cc gi tr Nu Adjust xung t vi Case Studyth tt Adjust bng cch Ignored

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To 1 Case Study 1. Tools/Databook hoc 2. Chn cc thng s cn theo di

3. Vo Case Study tab4. To Case Study mi 5. Chn thng s c lp v ph thuc

6. Thit lp cc gi tr cn theo di 7. Chy Case Study

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S dng Case Study Chn cc thng s cn theo di

Gas to LTS TemperatureHC Dewpoint Temperature

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S dng Case Study Chn thng s c lp v ph thuc

Gas to LTS Temperature - c lp HC Dewpoint Temperature - ph thuc

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S dng Case Study Thit lp cc gi tr cn theo di

Low Bound: -25oCHigh Bound: 5oC

Step size: 5oC

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S dng Case Study Start chy Case Study Results xem kt qu:

Table: Xem k t qu di dng bng Plot: Xem k t qu di dng th

Khong nhit no tho mn yu cuim sng ca Sale Gas?

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Kt ni vi template S dng template Propane Loop cung cp cng sut lm mt choChillerBiu tng Sub-Flowsheet trn ObjectPaletteChn Read an Existing Template Chn file template lu trongmodule 2, C3Loop.tpl

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Kt ni vi template Trong Feed Connetion to Sub- Flowsheet, kt niInternal Stream Chiller Q vi External Stream Chiller -Q

Lu lng Propane cn t yu

cu im sng l bao nhiu?

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Bi tp Gi thit UA ca thit b trao inhit ch t 1.e+5 kJ/C -h.

1. iu chnh thng s thit k caHeat Exchanger trong m phng phn nh iu kin trn

2. nh hng th no ti LMTD vTemperature Approach