Aspen模拟反应精馏-radfrac模块

RadFracforDummies:AHowtoGuideonAspenPlusThisexamplewillshowhowtouseRadfraconAspenPlustomodeldistillationcolumns.Thefeedshowninthediagramabovewillconsistof50lbmol/hrofMethanoland50lbmol/hrofwater.Apurityof99.5%isdesiredinboththebottomsanddistillateproductstreamsusingarefluxratioof1.5.DISTFEEDDISTILLBOTTOMSRadfrac©SDSM&T2/35Ifyoudon’tknowhowtologontoAspenPlus,pleaseseethe“GettingStartedonAspenPlus”manual.ChoosetheTemplateOptionClick“OK.”Thiswindowallowsyoutoselectaparticularsimulationoption.Forthisexample,selectthe“GeneralwithEnglishUnits”option.Also,makesurethattheoptionintheRunTypeboxdisplays“Flowsheet”Click“OK”Radfrac©SDSM&T3/35EachtimeAspenPlusisopenedandanewfileiscreatedoranexistingfileisopenedthisloginwindowappears.EnterUnixhostfortheservertype,sylvan.che.sdsmt.eduforthenodename,andyourcorrectUsernameandPassword.Click“OK”Anotherwindowwillappearindicatingtheconnectionwasestablished.Click“OK.”AspenPlusautomaticallyassignslabelstoeverystreamandblock.Toturnthisoptionoff,clickontheToolsmenuinthetoolbarandselectOptions.IntheOptionswindow,clickonthefoldertablabeled“Flowsheet”.Next,clickontheseboxesundertheStreamandBlocklabels.Thecheckmarksintheboxesshoulddisappearindicatingthattheseoptionsaredisabled.Click'OK'whenthrough.Radfrac©SDSM&T4/35Tostartthesimulation,clickontheColumnstabfoundintheselectionofpiecesofequipment.GotothedownarrowtotherightoftheRadFracselection.ClickonFract1,thesecondpicturefromtheleftinthetoprow.Next,movethecursorintothewhiteareaandclickonthedesiredpositionforthecolumn.ApromptshouldappearaskingtoinputtheblockID,forthisexample“Dist”waschosen.TheFeed,DistillandBottomsstreamsneedtobecreated.Tocreatethestreams,firstclickonthe“MaterialStreams”boxatthebottomleftcornerofthewindow.Redandbluearrowsappeararoundthecolumn.Aredarrowsignifiesastreamthatisrequiredforadesignspecification;bluearrowssignifyanoptionalstream.Radfrac©SDSM&T5/35Clickontheredarrowontheleftsideofthecolumntoaddyourfeedstream.Forthissimulationthereisonlyonefeedstream,ifthereweremorefeedstreamsusethebluearrowontheleftofthecolumntoaddmorestreams.Enter“Feed”intheIDboxwhenpromptedforthissimulation.Wenextneedtoaddtheproductstreams.Onlyoneoftheredarrowsneedstobechosenatthetopofthecolumn.Chosethebottomofthetworedarrowsatthetopofthecolumn.Thiscolumnwillhaveatotalcondenserandthereforeliquiddistillate.Labelthetopproductstream“Distill”.Nextaddthebottomproductstreamusingtheredarrow.Labeltheproduct“Bottoms”.Allthenecessarystreamshavebeenaddedandnumericaldatacannowbeentered.Radfrac©SDSM&T6/35Nowwearereadytobeginenteringthenecessarynumericaldata.Clickonthe“Next”buttontobeginenteringthedata.Thisbuttonisblueandislocatedinthetoolbaratthetopofthewindow.Click“OK”.Ifthisboxdoesn’tappearitisbecauseyourflowsheetisn’tcomplete.Aboxwillthenappeartellingyouwhatpartoftheflowsheetyouaremissing.Thisboxshouldappearandatitleforthissimulationcannowbeenteredalthoughisnotmandatoryforthissimulation.ClickontheNextbuttontocontinueenteringnumericaldata.Ifthisboxdoesn’tappearyoucangotoSetupontheleft-handsideoftheboxandclickonthat.Radfrac©SDSM&T7/35TheComponentsboxwillbethenexttoappear.Thisallowsustoenterallofthecomponentsthatwillbepresentwithinoursystem;inthissimulationtheywillbeMethanolandWater.Type“Methanol”underthecolumn“ComponentID”andpresstheEnterkey.Radfrac©SDSM&T8/35AspenPluswillnowsearchitsdatabaseandattempttomatchachemicalnamewiththeComponentIDthatwasentered.Ifthishappenstheotherthreeboxes(Type,ComponentName,andFormula)willfillautomaticallyandothercomponentscanthenbeentered.Enter“Water”inthesecondrowunder“ComponentID”andhitEntertofilltheotherthreeboxes.Wenowhaveenteredallthecomponentsnecessaryforthissimulation.Hitthe“Next”buttontoproceed.Radfrac©SDSM&T9/35ThenextscreentoappearisthePropertySpecificationssheet.ThisallowsustochoosethebasemethodthatwewanttouseforthecalculationsAspenPluswillperform.WewillselectNRTLforthissimulation.Click“Next.”Thenextscreentoappearwillshowtheinteractionparametersforthecomponentsinoursystemusingthebasemethodweselected.Ifyouarehappywiththisnumbers(andwesurehopeyouare)click“Next.”Radfrac©SDSM&T10/35Apromptscreenwillappearaskingifwewanttoenteranymoredataorchangethepropertyspecifications.Sinceeverythingisgoodtogo,click“OK.”Nowit’stimetobeginenteringthephysicaldataforthesystem.ThefirstscreenthatwillappearwillbefortheFeedstream.Beforeweactuallystartenteringdatalet’sgooveracoupleofthedifferentavailableoptions.Radfrac©SDSM&T11/35Thereare3“StateVariables”thatweareallowedtochoosefromTemperature,Pressure,orVaporFraction.2ofthese3mustbespecified.ClickonthearrowontherightsideofTemperatureorPressureBoxtoalternatebetweenthechoices.Theunitscanbechangedforanyvariablebysimplyclickingonthearrowontherightsideoftheunitbox.Thiswillbringupalistofdifferentunitstochoosefrom.ForthisexamplewewillusedegreesCelsiusfortemperatureandatmospheresforthepressure.Radfrac©SDSM&T12/35ChangetheunitsofTemperaturetoCelsiusandenter25.Alsosetthepressureinthestreamequalto1atm.Asstatedintheproblem,thefeedflowratetothecolumnneedstobesetat100lbmol/hr.Enterthathere.Thenextrequiredi