Vinyl Chloride Monomer Production ProcessWord格式文档下载.docx
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Vinyl Chloride Monomer Production ProcessWord格式文档下载.docx
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TwodistillationcolumnsareusedforthepurificationoftheVCMproduct.Inthefirstcolumn,anhydrousHCIisremovedoverheadandsenttotheoxychlorinationunit.Inthesecondcolumn,VCMproductisdeliveredoverhead,andthebottomsstreamcontainingunreactedEDCisrecycledbacktothecracker.TherecycleEDCstreamistreated,inablackboxseparator,toremovechloroprene,whichcouldhinderpyrolysisandfractionation.
Specificationsforthetwocolumnsare:
HClColumn
Theoreticalstages
15
Condenserpressure
367psia
Reboilerpressure
372psia
HClinbottoms
50ppm(weight)
VCMrecoveryinbottoms
99.9percent
VCMColumn
Theoreticalstages
10
Condenserpressure
115psia
Reboilerpressure
118psia
VCMrecoveryinoverheads
99.9percent
EDCrecoveryinbottoms
Tutorial
BaseCaseSimulation
DevelopabaseASPENPLUSsimulationfortheVCMflowsheet,usingthefollowingspecifications.Detailedinstructionsfollowthesegeneralones.
1.
ModelthecrackerfurnacewiththeRSTOICreactormodel.ConsideronlythemainVCMreactionatthispoint.
2.
ModelthereactoreffluentquenchusingtheHEATERmodel.Assume10degreessubcooling,andapressuredropof5psiaacrossthequench.
3.
ModeltheHCIcolumnusingtheDSTWUshortcutmodel.SpecifyHCIrecoveryof99.9%intheoverhead,VCMrecoveryof99.9%inthebottoms.
4.
ModeltheVCMcolumnusingtheDSNWshortcutmodel.SpecifyVCMrecoveryof99.9%intheoverhead,EDCrecoveryof99.9%inthebottoms.
5.
AssumetheflowrateofrecycleEDCis1600lbmol/hr.
6.
UsetheRedlich-Kwong-Soaveequationofstatetorepresentthephysicalpropertiesofthesystem.
Tutorial1introducestheuseofProcessflowsheetwindowasyoucreateandrunanASPENPLUSsimulationmodel.Thetutorialusestheprocessflowsheetexpertsystemtotakeyoustep-by-stepthroughtheprocessofcreatingandrunningsimulation.Asyoucreateyourownflowsheet,submittherun,andanalyzetheresults,youwilllearnthebasicsofhowtouseASPENPLUS.
Youwill
∙
Definetheproblem
Createasimulationflowsheetusinggraphics
Entertheinputspecifications
Browsecompleteinput
Runthesimulation
Reviewandrecordthesimulationresults
Definingtheproblem
YouwillcreateasimulationflowsheetforthetutorialproblemshowninFigure1.
Figure1:
ProcessFlowSheet
LogontoASPENPLUS.Youwillstartwithablankflowsheet.
CreatingaSimulationFlowsheet
ThissectionofthetutorialtakesyouthroughtheproblemdefinitionstepsincreatingthesimulationflowsheetshowninFigure1.
AspenPlusautomaticallynumberstheblocksandstreamsyoucreate,soyoudonothavetoenterIDsfortheseobjectsifyoudonotwantto.Youcanchangethisdefaultandenteryourownprefix.Inthistutorial,youwillletAspennumberthestreamsautomatically,usingtheprefix“S-“,andyouwillenteryourownIDsfortheblocks.ToindicatethatyouwanttoenteryourownIDsforblocks:
Onthemenubar,clickon“Tools|Options”.TheOptionsdialogwindowwillbedisplayed;
clickonthetabnamed“Flowsheet”.Unchecktheboxtotheleftof“Automaticallyassignstreamnamewithprefix”.Makesuretheoptionlabeled“Automaticallyassignstreamnamewithprefix”isselected(thereshouldbeacheckintheboxtotheleftofthislabel).InthetextboxtotheleftofthelabelenterS-.ClickOKtoacceptthechanges.
Saveyourworkbychoosing“File|Save”fromtheprogrammenu.Youcannamethefilewhateveryouchoose.Letscallit“AspenTutorial1–VinylChloride”.RemembertoSAVEYOUWORKOFTEN!
Thispointcannotbestressedenough.IfsomethinggoeswrongandASPENPLUScrashes(itdoesprettyoften,youcouldloosealotofwork.Itsalsoagoodideatomakeperiodicbackupsofyourfileseachweekorsooratmajormilestones.Note:
backupfiles(*.bkp)takeupmuchlessspacethanthenormal“AspenPLUSDocuments”files(*.awp).
TheModelLibraryatthebottomoftheprogramwindowisforselectingtheASPENPLUSunitoperationmodelsfortheblocksinyoursimulationflowsheet.Thismenuisorganizedasfollows:
ASPENPLUSModelSets
MixersandSplitters
Separators
HeatExchangers
Columns
Reactors
PressureChangers
Manipulators
Solids
UserModels
Eachofthesegroupshasprocessblockthatcanbeusedinyourflowsheet.Manyoftheblockshaveothersymbolsthatcanbeusedonyourflowsheettomakeitmoredescriptive.Suchblockswillhaveasmalldownarrownexttothesymbol.Usethistoselectothericonsforthisblock.NotethatthesymbolchangesarecompletelyaestheticandthereisnochangetothewayAspenwillinterprettheblock.
Ifyouwantmoreinformationaboutamodelbeforeselectingit,youcanusetheHelpmenufromthemenubar.Clickontheindextab,andtype“heater”togethelpontheheaterblock.Selectdoubleclickon“HeaterModel”,thendoubleclick“Heater(UserGuideVolume1)”.Youcouldalsoclickonthe“Arrowquestionmark”buttononthetoolbarandthenclickontheitemyouwant.
Thefirstblockinyourflowsheetisastoichiometricreactor.
Clickonthe“Reactors”tabtodisplaythereactormodelsprovidedbythemodelmanager.Clickonthe“RStoic”button.
Movethemousepointertothemiddleofthescreen,butdonotclickyet.
NoticethatwhenthemousepointerisontheModelLibraryitlookslikethenormalarrow,signifyingSelectmode.Whenthepointerisontheworkspace,itlookslikecrosshairs,signifyingInsertmodel.IfyouwouldliketocancelyourselectionoftheRStoicmodelwithoutinsertingitontotheflowsheetthenpressthearrowbuttonattheupperleftcornerofthemodellibraryorpressESC.
Movethemousepointertotheleftofcenteroftheflowsheet,andclicktheleftmousebuttontoinserttheRstoicblock.
AspenPlusdisplaysadialogboxaskingforablockID,orname,sinceyouturnedofftheautomaticblockIDnumberingoption.
TypetheIDCRACKandpressEnterorclickonOK.
AspenPlusdisplayaRSTOICblockwiththeIDCRACK.
Thesecondblockinyoursimulationflowsheet(seeFigure1)isareactoreffluentquenchthatusestheASPENPLUSmodelHEATER.
OntheModelLibrary,selectHeatExchangersthenclickonHeater.
InserttheHeaterblocktotherightoftheRSTOICblock.Whenyouinsertblocksintheflowsheet,besuretoleaveaboutaninchandahalfofspacebetweenblocksfortheconnectingstreamsandtheirlabels.
TypetheIDQUENCHinthedialogboxwhenasked,andpressEnter.
ThenextblockthefhowsheetistheHCLdistillationcolumn,whichwillbemodeledbyashortcutdistillationcolumnmodel,DSTWU.
OntheModelLibrary,selectColumnsthenclickonDSTWU.InserttheDSTWUblocktotherightoftheHEATER.TypetheIDCOL1inthedialogboxwhenasked,andpressenter.
ThelastblockintheflowsheetisVCMcolumn.Initiallyitwillbemodeledusing
DSTWUandlaterarigorousmodelwillbeused.
InserttheDSTWUblocktotherightoftheCOL1
TypetheIDCOL2inthedialogboxwhenasked,andpressenter.
Ifyouaccidentallyplacedaniconinthewronglocation,orjustwanttorealignafewthings,youcanmovetheiconbyusingthearrowkeysorbydraggingitwiththemouse.Usethearrowkeysforsmalladjustments.Usethemousetomakelargerchangesinposition.IfyouclickonanID,youcanmoveitinsteadofablockorstreamusingthesamemethods.
Thisisagoodtimetosaveyourworkagain
ClickontheMaterialSTREAMSbuttonlocatedatthebottomoftheflowsheetnexttothemodels.Nowwhenyoumoveyourmouseintotheflowsheetarearedandbluearrowswillappearonallofthemodelblockslocatedontheflowsheet.Redarrowsarerequiredportsandbluearrowsareoptionalports.
Thearrowsappeararoundtheblockonportsthatareavailable.Bypointingonanarrowinformationabouttheportisgiven.Dothisforeachporttoseethetypeofinformationprovided.TheleftmostarrowontheCRACKblockismarked“Feed(Required,1ormore)”,indicatingthatthisportisrequiredandthatitcanhaveoneormoreinletsconnectedtoit.
Clicktheleftmousebuttononthis(Feeds)arrow.MovethecursortotheemptyspaceleftoftheCRACKblockandpresstheleftmousebutton.AfeedlinelabeledS-1shouldappear.
ClickontheproductarrowlocatedontherightsideoftheCRACKblock.Arrowsappearonallthepossibleconnectingports.ClickonthearrowontheQUENCHblock.ThestreamIDASPENPLUSgeneratedisS-2.
NextclickontheProductarrowfortheQUENCHblock.ArrowsappearonthepossibleFeedports.ClickontheFeedportstreamontheCOL1block.ASPENPLUSgeneratesstreamIDS-3.
NextclickontheDistilatearrowfortheCOL1block.Movethecursorabovethebloc
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