SCR-Technology-for-Diesel-Engines

SouthwestResearchItitt®SouthwestResearchItitt®Institute®Institute®RRSCRTechnologyforDieselSCRTechnologyforDieselSCRTechnologyforDieselSCRTechnologyforDieselEnginesEnginesEnginesEnginesMagdiKhair&QilongLuMagdiKhair&QilongLuSouthwestResearchInstituteSouthwestResearchInstituteMagdiKhair&QilongLuMagdiKhair&QilongLuSouthwestResearchInstituteSouthwestResearchInstituteSanAntonio,TexasSanAntonio,TexasMarch,2010March,2010SanAntonio,TexasSanAntonio,TexasMarch,2010March,2010OutlineOutlineOutlineOutlineIntroductionIntroductionIntroductionIntroductionTheLegislativeEnvironmentintheUSATheLegislativeEnvironmentintheUSAStatusofDieselEngineDevelopmentStatusofDieselEngineDevelopmentStatusofDieselEngineDevelopmentStatusofDieselEngineDevelopmentAuxiliaryEmissionControlDevicesAuxiliaryEmissionControlDevicesStDltF2010StDltF2010HDHDSystemDevelopmentsFor2010SystemDevelopmentsFor2010––HDHDSampleResultsSampleResults––HDHDSystemDevelopmentsFor2010SystemDevelopmentsFor2010––LDLDSummary/ConclusionSummary/ConclusionRRIntroductionIntroductionIntroductionIntroductionRegulatoryConstraintsRegulatoryConstraintsTechnologiesForInTechnologiesForIn--CylinderNOCylinderNOxxReductionReductionAuxiliaryEmissionControlDevicesAuxiliaryEmissionControlDevicesyyExperienceatSwRIExperienceatSwRIHeavyHeavy--DutyCalibration&DurabilityDutyCalibration&DurabilityLightLight--DutyDevelopmentDutyDevelopmentExhaustSystemArchitectureExhaustSystemArchitectureClosingRemarksClosingRemarksClosingRemarksClosingRemarksRRTheLegislativeEnvironmentInTheUSATheLegislativeEnvironmentInTheUSA19880.600.60HPHP--HRHR0.250.25ulate,G/Hulate,G/H19910.100.10ParticPartic1991199419980.050.052525334455661122199419982002(NOx+HC)StandardsStandardsF2007/2010F2007/2010NONOxx,G/HP,G/HP--HRHR2.52.5334455661122For2007/2010For2007/2010RRTechnologiesForNOTechnologiesForNOReductionReductionInjectionSystemTechnologiesInjectionSystemTechnologiesExhaustGasRecirculationExhaustGasRecirculationTechnologiesForNOTechnologiesForNOxxReductionReduction--TimingStrategiesTimingStrategies--MultipleInjectionsMultipleInjections--RateShapingRateShaping--LightLight--ModerateModerate--MassiveMassiveRateShapingRateShaping--InjectionPressureInjectionPressureAlternativeCombustionAlternativeCombustionSystemsSystemsMassiveMassiveFuelsFuels--GasGas--ToTo--LiquidLiquidBidilBidilSystemsSystems--HCCIHCCI--PilotPilot--BiodieselsBiodieselsValveTrainValveTrain--ResidualsResiduals--PCCIPCCI--AECDsAECDs--CRManipulationCRManipulationRRAuxiliaryEmissionControlDevicesAuxiliaryEmissionControlDevicesHelpfulinMeetingRegulationsWhenEngineHelpfulinMeetingRegulationsWhenEngineDevelopmentFallsShort(DOCinUSA)DevelopmentFallsShort(DOCinUSA)eeopetasSot(OCUS)eeopetasSot(OCUS)AddCostandComplexityAddCostandComplexityAllowAdditionalFreedominEngineAllowAdditionalFreedominEngineAllowAdditionalFreedominEngineAllowAdditionalFreedominEngineDevelopmentOptimization(DPFinUSA)DevelopmentOptimization(DPFinUSA)AddCostandComplexityAddCostandComplexityAddCostandComplexityAddCostandComplexityMayBeTheOnlyWayToMeet2010(NOMayBeTheOnlyWayToMeet2010(NOxxRed.)Red.)AddCostComplexityandUncertainty(ReliabilityAddCostComplexityandUncertainty(ReliabilityAddCost,Complexity,andUncertainty(ReliabilityAddCost,Complexity,andUncertainty(Reliability&Durability)&Durability)RRAuxiliaryEmissionControlDevicesAuxiliaryEmissionControlDevicesAuxiliaryEmissionControlDevicesAuxiliaryEmissionControlDevicesForNOForNOXXReductionReductionForNOForNOXXReductionReduction--LeanNOLeanNOXXCatalyst(DeNOCatalyst(DeNOXX,HCSCR),HCSCR)LeanNOLeanNOTrap(NOTrap(NOAdsorbersNACNSR)AdsorbersNACNSR)--LeanNOLeanNOXXTrap(NOTrap(NOXXAdsorbers,NAC,NSR)Adsorbers,NAC,NSR)--UreaSCRUreaSCRForPMReductionForPMReductionForPMReductionForPMReduction--CatalyzedSootFiltersCatalyzedSootFilters--ContinuouslyContinuously--RegeneratedTrapsRegeneratedTraps--CatalyzedContinuouslyCatalyzedContinuously--RegeneratedTrapsRegeneratedTrapsRRLeanNOLeanNOXXCatalystsCatalysts(DeNO(DeNOXX,HCSCR),HCSCR)((XX))(COMPOSITEGENERATEDFROMINDUSTRYEXPERIENCE)5060EFFICIENCY,%Pt-ZCu-ZTRANSIENTCOMPOSITEREDUCTION15-30%10203040NOxCONVERSIONN2OSupplementalHCEXHAUSTTEMPERATURE,C200250300350400450F/NO=46:1UsesSameonboardHC(Fuel)asUsesSameonboardHC(Fuel)astheReductanttheReductantLowNOLowNOXXConversion(30%)Conversion(30%)NarrowTemp.RangeNarrowTemp.RangeAdvantagesDisadvantagestheReductanttheReductantProvidesSafetyMargininCloseProvidesSafetyMargininCloseCalibrationsCalibrationsReasonableSulfurToleranceReasonableSulfurTolerancepgpgNN22OFormation(LowTemp.Cat.)OFormation(LowTemp.Cat.)PoorDurability(HighTemp.Cat.)PoorDurability(HighTemp.Cat.)HighFuelConsumptionPenaltyHighFuelConsumptionPenaltyReasonableSulfurToleranceReasonableSulfurToleranceHighFuelConsumptionPenaltyHighFuelConsumptionPenalty(10%@30%Conversion)(10%@30%Conversion)RRLeanNOLeanNOXXTrapsTraps(NO(NOXXAdsorbers,NAC,NSR)Adsorbers,NAC,NSR)DesulfationRegenerationUsesSameonboardHC(Fuel)asUsesSameonboardHC(Fuel)astheReductanttheReductantExtremelySensitivetoSulfurExtremelySensitivetoSulfurComplexRegenerationC