aspenbatch间歇精馏模拟.docx
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aspenbatch间歇精馏模拟.docx
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aspenbatch间歇精馏模拟
Aspen间歇精馏模拟教程
UsethisGettingStartedsectiontobecomefamiliarwiththestepstosetupabatchsimulationusingAspenBatchModeler.
Youwillbemodelingasystemtorecovermethanolfromamixtureofmethanolandwater.
Theobjectiveistoseparatemethanolfromthemixturewithapurityof99%.Thismixtureisnotidealgiventhepolarityofthemolecules;therefore,foraworkingpressureof1atm,youwillchooseNRTLtomodelitsphysicalproperties.
Therearefourstepsinthisprocess.Clickasteptogotheinstructionsforthestep.Step1–SetupthePropertiesforAspenBatchModeler
Step2–EnterstructuraldataandspecificationsfortheAspenBatchModelerblockStep3–EnterOperatingSteps
Step4–Runthesimulationandviewtheresults
Step1-SetupthePropertiesforAspenBatchModeler
WewanttodefineaPropertiesfilethathasthefollowingdefined.
ComponentsPropertyMethod
WaterNRTL
Methanol
TodefinethisPropertiesfile,followthestepsbelow.
TosetuptheProblemDefinitionfilefromwithinAspenBatchModeler:
1.StartAspenBatchModeler.
2.OntheSpeciesform,clickEditUsingAspenProperties.
ThiswillstartAspenProperties.
3.EntertheComponents:
ComponentID
Componentname
Formula
WATER
WATER
H2O
METHANOL
METHANOL
CH4O
Tip:
YoucanusetheNextbutton
4.ClicktheNextbuttonPropertiesSpecificationsform.
5.OnthePropertiesSpecificationsform,inthePropertymethodfield,selectNRTL.Tip:
Clickingthepull-downarrowonthefieldandtypingN(thefirstletteroftheproperty
methodname)takesyoutotherightchoicemuchfasterthanjustscrollingdownthelonglist.
6.ClickNext
Youaretakentothebinaryparametersforms,whereyoucanviewthebinaryparametersthatwillbeusedforPropertiesCalculations.
7.ClickNext
Youarepromptedtoclickoneoftheoptionsshownbelow.
8.Thereisnoneedforfurtherinput,soclickOKtorunthepropertysetup.
9.CloseAspenPropertiesbyclickingFile|Exit.
Youarepromptedwiththefollowing:
10.ClickYestosavethefile.
ThePropertysetupisnowcomplete.
Step2-EnterstructuraldataandspecificationsfortheAspenBatchModelerblock
Thecolumnhasbeendesignedasfollows:
Configuration
10Stages(thisincludeseighttrays,condenserandpot)Vapor-liquidseparation
PotGeometryEllipticalhead1mdiametervolumeof1m3
Overhead
TotalCondenser
Distillatemoleflowrate=4.5kmol/hrRefluxdrumispresent
(noneedtoenterdimensionbecausewearedefiningfixedpressureprofile/holdups;thereforerefluxholdupwillbeentered)
Pressure/HoldupsPressureprofileisfixed
Condenserpressure1.01325barColumnPressureDrop0.1bar
Holdups
RefluxDrumliquidholdup:
0.02m3Stageholdup:
0.005m3
HeatTransfer
Duty:
150kW
Receivers
OnereceiverforliquiddistillateInitialcondition:
totalrefluxInitialConditions
InitialCharge18kmolofmaterial
ComponentmolefractionMethanol:
0.4
Water:
0.6
ToEntertheData
1.SettheconfigurationtoBatchDistillationColumn,specifythenumberofstagesandensurevalidphasesareVapor-LiquidontheConfigurationMainform
10Stages(thisincludeseighttrays,condenser,andpot)Vapor-liquidseparation
2.OntheSetup|PotGeometrytab,typethepotdimensions:
Elliptical;1mdiameter;volumeof1m3
3.ClicktheOverheadform.OntheCondensertab,clickTotalforTotalcondenser.
4.OntheRefluxtab,typethedistillatemoleflowrate:
Distillatemoleflowrate=4.5kmol/hrRefluxdrumispresent
Note:
Youneednotenterdimensionbecausewearedefiningfixedpressureprofile/holdups.Therefore,refluxholdupwillbeentered.
5.ClicktheJacketHeatingformunderSetup.OntheJacketHeatingtab,enterthepotconditions:
Duty:
150kW
6.ClickPressure/Holdups|Pressure.
7.OnthePressuretab,typethepressureprofile:
Pressureprofileisfixed.
Condenserpressure1.01325barColumnPressureDrop0.1bar
8.OntheHoldupstab,typetherefluxandstageholdupinformation:
3
RefluxDrumliquidholdup:
0.02mStageholdup:
0.005m3
9.ClickReceivers|Distillate.
10.OntheDistillatetab,defineoneliquiddistillatereceiver.
11.ClickInitialConditions|Main.
12.OntheMaintab,intheInitialconditionfield,clickTotalreflux.
13.OntheInitialChargetab,definethefollowing:
Totalinitialcharge:
18kmolofmaterialComponentmolefraction:
Methanol:
0.4
Water:
0.6
Note:
Donotforgettosaveyourworkregularly.
Tosaveyourfileforthefirsttime:
1.OntheFilemenu,clickSaveAs.
2.IntheFilenamefield,typeaname,orselectafilenametooverwriteanexistingfile:
3.ClickSave.
Step3-EnterOperatingSteps
TherearetwoOperatingSteps:
1.Startproductdrawmaintainingadistillateflowrateof4.5kmol/hr.
2.Stopwhenthemolefractionofwaterinthedistillatereceiverapproaches0.01frombelow.Thebatchiscomplete.
Tocreatetherequiredoperatingstepstoruntheproblem:
1.ClickOperatingStepsandenterdistilintheNamecolumnoftheOperatingStepstable.
Thiswillcreatethefirstoperatingstepdistil.
2.OntheChangedParameterstab,createanoperatingsteptodistillthemethanolbymaintainingadistillateflowrateof4.5kmol/hr.
3.OntheEndConditiontab,specifyastheendconditionthemolefractionofwaterinthedistillatereceiverapproachingthevalueof0.01frombelow.
Step4-Runthesimulationandviewtheresults
Thesimulationisnowreadytorun.
Beforerunningthesimulation,itisagoodideatocreateplotsforkeyvariablessuchas:
thecompositionandholdupintheReceiver
thecompositionandtemperatureinthepotandsoon
Tocreateplotsforkeyvariables:
1.OnthePlotsform,clicktheTemperatureandCompositiontocreatetimeplotsforpottemperatureandmolefractions.
2.UsetheCustomplotsfeaturetocreateplotsofthereceiverholdupsandcompositions.ClickNewontheCustomplotstableandspecifyH2O_distilasthenameoftheplot.
3.GototheHoldupsSummaryResults\Distillatetab.SelectthefieldthatdisplaystheWATERmolefractionanddragitontotheplot(H2O_distil)createdinthepreviousstep.
4.Usethesameapproachtocreateplotsofholdupsinthereceiverand/ortheplot.
5.YoucanchangethetimeunitsdisplayedintheplotsbyclickingtheRunOptionstoolbar
buttonSelectthetimeunitsinwhichtheuserinterfaceshoulddisplaytimefield.
14.ClicktheRunbuttonandviewtheSimulationMessageswindowforanyrelevant
messages.
Oncetheproblemhasrunsuccessfullyyoucanviewresultsintheforms.
Batchtime:
1.49hours/89.4minutesPottemperature:
101.05℃Methanolrecovery:
6.636kmol
Note:
Itisalwaysgoodpracticetorestartyoursimulationinordertorestoreittotimezerobeforesavingyourwork.
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