06Algo_Concept_Calc_Diags.pdf

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1、AdvancedDistillationwithAspenPlusAlgorithmConceptsandCalculationDiagnosticsAlgorithmConceptsandCalculationDiagnosticsAdvancedDistillationwithAspenPlus©2002AspenTech.AllRightsReserved.LessonObjectives•UnderstandRadFracAlgorithms©2002AspenTech.AllRightsReserved.©2002Aspe

2、nTech.AllRightsReserved.7–1AspenTechnology,Inc.AdvancedDistillationwithAspenPlusAlgorithmConceptsandCalculationDiagnosticsBasicConvergenceStrategyRadFracconvergencehastwoparts:1.Initialization–Guessingasolution(oratleastsomethinggoodenoughtostartwith)2.Convergence–Refi

3、ningthatguessuntilitisn’tchangingfromiterationtoiteration©2002AspenTech.AllRightsReserved.Built-inConvergenceSchemesOptionInitializationConvergenceStrategyMethodStandardStandardStandardPetroleum/StandardSum-RatesWide-boilingStronglynon-StandardNon-idealidealliquidAzeot

4、ropicAzeotropicNewtonCryogenicCryogenicStandardCustomAnyAny©2002AspenTech.AllRightsReserved.©2002AspenTech.AllRightsReserved.7–2AspenTechnology,Inc.AdvancedDistillationwithAspenPlusAlgorithmConceptsandCalculationDiagnosticsInitializationBasicsRadFracistryingtofindT,P,x

5、,y,VandLoneverystage.Initializationistheprocessofguessingsomevalueforallthosevariables–RadFracusespreviousresultsifavailable.–Elseitusesestimates,ifprovided.–Whereneitherareavailable,itusestheinitializationstrategyselected.©2002AspenTech.AllRightsReserved.RadFracDefaul

6、tInitializationStrategyTheRadFracdefaultinitializationstrategy:•Performsflashcalculationsoncompositefeedtoobtainaveragevaporandliquidcompositions.•Assumesaconstantcompositionprofile.•Estimatestemperatureprofilebasedonbubbleanddewpointtemperaturesofcompositefeed.©2002As

7、penTech.AllRightsReserved.©2002AspenTech.AllRightsReserved.7–3AspenTechnology,Inc.AdvancedDistillationwithAspenPlusAlgorithmConceptsandCalculationDiagnosticsInitializationOptionUsethisstrategyForthissituation…………………………………………………………………..CrudeWideboilingsystemswithmultidr

8、awcolumns…………………………………………………………………..ChemicalNarrowboilingchemicalsystems…………………………………………………………………..AzeotropicAzeotrop