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1、IdentificationofHeatIntegrationRetrofitOpportunitiesforCrudeDistillationandResidueCrackingUnitsAdrianL.Querzoli,AndrewF.A.Hoadley†andTonyE.S.DysonTheDepartmentofChemicalEngineering,P.O.Box36,MonashUniversity,Vic.3800,AustraliaAbstract---Thisstudyinvest
2、igatesimprovingtheenergyefficiencyoftwokeyrefiningprocesses:theCrudeDistilla-tionUnit(CDU)andtheResidueCrackingUnit(RCU).Theresearchmethodologyfollowedthe‘targetingbeforedesign’approach.TheCDUisa‘tightlypinched’system,withlimitedopportunitiesforfurther
3、energysavings.TheoRCUactualDTminisaround55Cindicatingalowlevelofcurrentheatrecovery.TheTotal-Siteanalysisshowsthattheoretically18MWofheatcouldbetransferredfromtheRCUtotheCDU,reducingCDUrequirementsby40%foraneworgrassrootsdesign.RCUretrofitdesignswerede
4、velopedtoincreasesteamgenerationbyupto35%andinlinewithtargetingestimateswouldappeartohaveeconomicpotential.ThealternativeCDU-RCUretrofitdesignwasdevelopedtodecreaseCDUhotutilityuse.AlthoughtheTotal-Siteprofiledemonstratedstrongpotentialforheatintegrati
5、on,thisretrofitdesignisnotcommerciallyattractive,asthedecreaseinCDUfueldoesnotoffsetthecostofreducedsteamgeneration.ThisdemonstratestheneedtoconsiderthedifferentfuelandsteamcostsintheTotal-Siteanalysis.Keywords:HeatIntegration,RetrofitDesign,HeatExchan
6、gerNetworks,PinchAnalysis,CrudeDistillation,ResidueCatalyticCracking,EnergyRecoveryINTRODUCTIONLITERATURETherearenumerousdriversforoilrefinerstocontinuetoimprove1.PreviousRefineryStudiesenergyefficiencyandreduceemissions.ThisworkinvestigatestheThepione
7、eringworkofLinhoff[1984]andlaterSmith[1995]potentialtoimproveheatintegrationintwokeyrefiningprocesses,atUMISThasenabledProcessIntegrationtoevolveasanewfieldtheCrudeDistillationUnit(CDU)andtheResidueCrackingUnitinchemicalengineering.Therearenumeroussucc
8、essfulindustrial(RCU),usingBPKwinanaRefineryasacasestudy.Theproblemapplications,typicallydecreasingenergycostsby30%.Theorigi-willbeconsideredfromaretrofitperspective,withtheaimofpro-naldevelopmentofpinchanalysisforHeatExchangerNetworkvi
