化工設計摘要--

1、350kt/aC4ComprehensiveUtilizationProject-Abstract1. ProcessDesign1.1 RawMaterialandProductsTherawmaterialofthisprojectisC4hydrocarbonmixture,whosecompositionasfollows:Table1-1CompositionofRawMaterialsCompositionFraction/wt%i-butane0.4n-butane5.81-butylene37.27Cis2-butene4.0Trans-2-butene5.16i-butene

2、1.171,2-butadiene-1,3-butadiene45.31-butyne-2-butyne-Vinylacetylene0.7C50.1C30.1Table1-2CompositionandSpecificationofProductsItemTestmethodNationalstandard/%Companystandard/%QualityProduction(kt/a)1,3-butadieneGB/T13291-2008>99.50(wt%)99.7%(wt%)excellentgrade163propyleneGB/T7716-2002>99.60(V/V

3、)99.7%(V/V)excellentgrade145ethyleneGB/T7715-2003>99.90(V/V)99.9%(V/V)first-class32350kt/aC4ComprehensiveUtilizationProject-Abstract1.2ProcessSchemeThisprojectconsistsoftwosections:butadieneextractionandraffinateC4catalyticcracking.ThesectionofbutadieneextractionistoextractthebutadienefromtheC4hy

4、drocarbonmixturerawmaterial,whichconsistsofdoubleextracting,doublestrippingandbutadienepurification.Thesectionofcatalyticcrackingconsistsofcatalyticcrackingandseparating,whichproducedpolymergradepropyleneandethylene.Figure1-1ButadieneExtractionProducePFDre；inbutadieneextractantexhaustgasC4firstextra

5、ctionfirststrippingcompressecondsecondsextractionstrippingpurificationExtractantrecoveryFigure1-2RaffinateC4CrackingProducePFD350kt/aC4ComprehensiveUtilizationProject-Abstract1.3MainInnovationofProcess(1) .C4C8olefinscanbereactedintheZSM-5catalyst.Sothe4C5olefinscanberecycledtotherawmaterial,whichim

6、provestheyieldcoefficientofpropylene.(2) Wefoundthebestconditionsofcatalyticcrackingreactionfromrelatedpatent.Butthebestdimensionofthereactorisunknown.Forthat,wesimulatedthreedifferentaspectratiosofreactorbyusingComsolMultiphysics.Fromtheresultofsimulation,wegotthebestdimensionofreactor.3Figure1-3Th

7、eResultofSimulationbyComsolMultiphysics350kt/aC4ComprehensiveUtilizationProject-Abstract-0_一，.(3).ThecontrolparametercanbeoptimizedbyAspenDynamics,whichhasguidingsignificanceforthepracticaloperation.83即例OiL>0-J-Q:A，iFigure1-2TheSimulationofPropyleneCouplingTower2.Energy-savingDesign2.1Simulationo

8、fHeatExchangerNetwork350kt/aC4ComprehensiveUtilizationProject-Abstract曰一,，.一Accordingtopinchpointtheory,weanalyzedtheheatexchangernetworkoftheproductionofbutadiene,propyleneandethylenebyAspenEnergyAnalyzer,researchingthebottleneckoftheusingofheatexchangernetwork,soastofindouttheirrationalpartsandrea

9、sons.Withthatwecanmeettheminimumcostofutilitysystemandequipment.Figure2-1ButadieneExtractionSectionEnergyMatching350kt/aC4ComprehensiveUtilizationProject-Abstractme*Figure2-3PartofHeatExchangeMethodSimulation2.2TertiaryRefrigerationTechnologyith350kt/aC4ComprehensiveUtilizationProject-AbstractThetra

10、ditionalrefrigerantmethane,ethyleneandpropylenearemixedproportionatelyinarefrigerationcompressortoofferkindsofrefrigerantofdifferenttemperatureleveltothecoolingutilitysystem.Withthistechnology,weturnedthreeindependentrefrigeratingsystemintoone,whichreducedthecostofequipment.3. SecurityScheme3.15 ecu

11、rityRiskAnalysisThetanksofbutadiene,propyleneandethylenearethemajorhazardinstallations,whichisanalyzedbyRisksystem.Bysimulatingpoolfireaccident,vaporexplosionaccidentandvaporcloudexplosionmodel,wecanforecastthedamagerangeandtakethesafetymeasures.3.16 ventTreeAnalysisByusingeventtreetoanalyzethegas-l

12、iquidseparator,weobtaintheimprovementmethod.4. EquipmentDesignAccordingtotheprocesssimulationresultsfromAspenplus,wedesignthereactorR0201,de-ethanetowerT0202andheatexchangerE0103indetail.WiththehelpofKG-towerandSW6-98,wecheckedalltowersinthisproject.Also,alltheheatexchangerischeckedbySW6-98andAspenH

13、TFS.Besides,weaccomplishedthemodelselectionofallthestandardequipmentsuchaspump,compressor,tower,storagetank,ith350kt/aC4ComprehensiveUtilizationProject-Abstractbuffertank,refluxtanketc.5. ControlSchemeTakingtheSafetyfirst”asourdesignprinciple,HAZOPisusedtoanalyzethebutadieneextractiontower,catalytic

14、crackingreactor,compressorandpropylenetanks.Then,weutilizeAspenDynamicstosimulatethecontrolconditionsofpropylenecouplingtower.6. LayoutSchemeFromthecomparisonoftheXinjiangKelamayiMunicipalityDushanziDistrict,FujianProvinceQuanzhouMunicipalityQuangangDistrictandTianjinMunicipalityBinhaiDistrict,wefin

15、allyselectedXinjiangKelamayiMunicipalityDushanziDistrictasthesiteofourplantforitssuperiorgeographiclocation,abundantrawmaterialsourceandprivilegenationalpolicy.Thelayoutschemefollowedthepolicyof“Takeheadvantageofeveryinchofland,preserveeveryinchoffarmland”.Adjustmeasurelocalconditions,landconservati

16、on,andimprovelanduse.Ourplantlayoutschemeasfollows:350kt/aC4ComprehensiveUtilizationProject-AbstractFigure6-1PlantLayout7.EconomyAssessmentThroughtheinvestmentestimateandfinancialevaluation,weobtainedthecomprehensivetechnicalandeconomicindexshownastable7-1.Table7-1ComprehensiveTechnicalandEconomicIn

17、dexNo.ItemUnitAmount1ProductioncapacityKt/a3502Plantarea2m1024083Architecturalarea2m23025.44OperationdayinayearHours/year80005TheprojecttotalinvestmentTenthousandYuan170568.66Fixedassetinvestment(FAI)TenthousandYuan106797.77DirectmaterialcostTenthousandYuan287481.098Totalstaffnumberpeople1809Annualt

18、otalcostTenthousandYuan/a403071.410AnnualsalesproceedsTenthousandYuan/a487391.0911AnnualtotalnetprofitTenthousandYuan/a59669.7712Investmentprofitratio%29.8613Staticrateofinvestmentreturns%43.4414Internalrateofreturns%18.9615PaybackperiodYear4.7316NPVTenthousandYuan89256.54350kt/aC4ComprehensiveUtilizationProject-Abstract8.SummaryTakingthe“safyandsteady,energy-savingandenvironmentalprotection,harmoniousdevelopment”asourdesignprinciple,weaccomplishthewholepreliminarydesignof350kt/aC4comprehensiveutilizationproject.Therawmaterialsourceandproduc