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1、Designation:D7668?14aStardTestMethodfDeterminationofDerivedCetaneNumber(DCN)ofDieselFuelOils—IgnitionDelayCombustionDelayUsingaConstantVolumeCombustionChamberMethod1ThisstardisissuedunderthefixeddesignationD7668thenumber

2、immediatelyfollowingthedesignationindicatestheyearofiginaladoptioninthecaseofrevisiontheyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperepsilon()indicatesaneditialchangesincethelastrevisionr

3、eapproval.1.Scope1.1ThistestmethodcoversthequantitativedeterminationofthederivedcetanenumberofconventionaldieselfueloilsdieselfueloilscontainingcetanenumberimproveradditivesisapplicabletoproductstypicalofSpecificationD97

4、5GradesNo.1D2DregularlowultralowsulfurdieselfueloilsEuropeanstardEN590CanadianstardsCANCGSB3.517CANCGSB3.6.Thetestmethodmaybeappliedtothequantitativedeterminationofthederivedcetanenumberofbiodieselblendsofdieselfueloilsc

5、ontainingbiodieselmaterial(fexampleSpecificationsD975D6751D7467)dieselfueloilblendingcomponents.1.2Thistestmethodutilizesaconstantvolumecombustionchamberwithdirectfuelinjectionintoheatedcompressedsyntheticair.Adynamicpre

6、ssurewaveisproducedfromthecombustionofthesample.Anequationconvertstheignitiondelaythecombustiondelaydeterminedfromthedynamicpressurecurvetoaderivedcetanenumber(DCN).1.3Thistestmethodcoverstheignitiondelayrangingfrom1.9to

7、25mscombustiondelayrangingfrom2.5to160ms(30to70DCN).HowevertheprecisionstatedonlycoverstherangeofDCNfrom39to67.1.4ThevaluesstatedinSIunitsaretoberegardedasstard.Nootherunitsofmeasurementareincludedinthisstard.1.5Thisstar

8、ddoesnotpurpttoaddressallofthesafetyconcernsifanyassociatedwithitsuse.Itistheresponsibilityoftheuserofthisstardtoestablishappropriatesafetyhealthpracticesdeterminetheapplicabilityofregulatylimitationspritouse.2.Reference

9、dDocuments2.1ASTMStards:2D613TestMethodfCetaneNumberofDieselFuelOilD975SpecificationfDieselFuelOilsD1193SpecificationfReagentWaterD4057PracticefManualSamplingofPetroleumPetroleumProductsD4175TerminologyRelatingtoPetroleu

10、mPetroleumProductsLubricantsD4177PracticefAutomaticSamplingofPetroleumPetroleumProductsD5854PracticefMixingHlingofLiquidSamplesofPetroleumPetroleumProductsD6299PracticefApplyingStatisticalQualityAssuranceControltingTechn

11、iquestoEvaluateAnalyticalMeasurementSystemPerfmanceD6300PracticefDeterminationofPrecisionBiasDatafUseinTestMethodsfPetroleumProductsLubricantsD6708PracticefStatisticalAssessmentImprovementofExpectedAgreementBetweenTwoTes

12、tMethodsthatPurpttoMeasuretheSamePropertyofaMaterialD6751SpecificationfBiodieselFuelBlendStock(B100)fdleDistillateFuelsD7467SpecificationfDieselFuelOilBiodieselBlend(B6toB20)E456TerminologyRelatingtoQualityStatistics2.2E

13、NStards:3EN590AutomotiveFuels—Diesel—RequirementsTestMethods2.3EnergyInstituteStards:4IP41IgnitionQualityofDieselFuels—CetaneEngineTestMethod1ThistestmethodisunderthejurisdictionofASTMCommitteeD02onPetroleumProductsLiqui

14、dFuelsLubricantsisthedirectresponsibilityofSubcommitteeD02.01.0ConTestEquipmentProceduresInstrumentation.CurrenteditionapprovedMay12014.PublishedMay2014.iginallyapprovedin2010.Lastpreviouseditionapprovedin2014asD7668–14.

15、DOI:10.1520D766814A.2FreferencedASTMstardsvisittheASTMwebsitewww.astm.gcontactASTMCustomerServiceat.FAnnualBookofASTMStardsvolumeinfmationrefertothestard’sDocumentSummarypageontheASTMwebsite.3AvailablefromEuropeanCommitt

16、eefStardization.CentralSecretariat:ruedeStassart36B1050BrusselsBelgium.4AvailablefromEnergyInstitute61NewCavendishSt.LondonWIG7ARU.K.:www.energyinst.g.uk.ASummaryofChangessectionappearsattheendofthisstardCopyright?ASTMIn

17、ternational100BarrHarbDrivePOBoxC700WestConshohockenPA194282959.UnitedStates1specificpointsalongthecombustionpressurewaveproducedbythecombustioncycle.Acompletesequencecomprises5preliminaryinjectioncycles15subsequentinjec

18、tioncyclesusedfthesampleanalysis.TheIDCDmeasurementsfthelast15injectioncyclesarestatisticallyreviewedtheoutlyingID’sCD’sareeliminatedusingPeirce’sCriterion.7TheremainingID’sCD’sareaveragedtoproducethetwoindependentresult

19、s.AnequationconvertstheaverageIDresulttheaverageCDresultintoaDCN.5.SignificanceUse5.1TheIDCDvaluestheDCNvaluedeterminedbythistestmethodprovidesameasureoftheignitionacteristicsofdieselfueloilusedincompressionignitionengin

20、es.5.2Thistestcanbeusedbyenginemanufacturerspetroleumrefinersmarketersincommerceasaspecificationaidtorelatematchfuelsengines.5.3TherelationshipofdieselfueloilDCNdeterminationstotheperfmanceoffullscalevariablespeedvariabl

21、eloaddieselenginesisnotcompletelyunderstood.5.4Thistestcanbeappliedtononconventionaldieselfuels.5.5Thistestdeterminesignitionacteristicsrequiresasampleofapproximately370mLatesttimeofapproximately30minusingafitfuseinstrum

22、ent.6.Interferences6.1Warning—MinimizeexposureofsamplefuelscalibrationreferencematerialsQCsamplescheckstardstosunlightfluescentlampUVemissionstominimizeinducedchemicalreactionsthatcanaffectthedelaymeasurements.86.1.1Expo

23、sureofthesefuelsmaterialstoUVwavelengthsshterthan550nmfashtperiodoftimecansignificantlyaffectignitiondelaymeasurements.NOTE1—Thefmationofperoxideradicalscanaffectignitiondelaymeasurement.Thesefmationsareminimizedwhenthes

24、amplematerialisstedinthedarkinacoldroomatatemperatureoflessthan10Ccoveredbyablanketofnitrogen.7.Apparatus7.1General—Thistestmethodusesanintegratedautomatedanalyticalmeasurementsystem9comprisedof:7.1.1CombustionChamber—Ac

25、ylindricalchamberhavingavolumeof0.4736005Lwithexternalheatingelementsheatshieldelectricallyactuatedintakeexhaustvalves.Thereisanopeningatoneendofthechambertoaccommodateionofthefuelinjectionnozzleassemblythereareopeningsa

26、ttheotherendofthechambertoairremoveexhaustattachapressuresens.7.1.2FuelInjectionSystem—Ahighpressuresamplegeneratedusingahydraulicpumppressuremultiplierisdeliveredtoacommercialelectronicdieselfuelinject.Asamplereservoirs

27、uppliesthepressuremultiplierwithsampletoensureproperrepeatableinjectionofcalibrationQCmaterialtestspecimensintothecombustionchamber.Thesystemincludes:7.1.2.1FuelSampleReservoir—Ametalreservoirhavinganominalvolumeof200mL.

28、7.1.2.2HydraulicPump—Capableofproducingfuelpressuresupto19MPa.7.1.2.3PressureMultiplier—10:1ratio.7.1.2.4FuelInject—AsolenoidbasedcommonraildieselfuelinjectfromBoschwiththepartnumber0445110181(AnnexA6).7.1.2.5SafetyBurst

29、Disk—Relievesthehighpressureifthesamplepressureexceeds180MPa.Theburstdiskisattachedtothehighpressuresamplesystemmanifoldblockoppositetheinject.7.1.2.6FlushValve—Highpressureairactuatedvalveusedtoexchangesamples.7.1.3Cool

30、antSystem—Aclosedloopcirculatingcoolantsystemtocontrolthetemperatureofthecombustioninjectnozzledynamicpressuresens.Thesystemincludesanauxiliaryheatexchangerwithbuiltincirculatingpumpflowcontrolvalves.7.1.4InstrumentSenss

31、—Senssusedtomeasureeitherindicatethevalueofavariabletransmittheconditionfcontroldataacquisitionpurposessuchas:7.1.4.1CombustionChamberStaticPressureSens—Acalibratedsensinstalledtocrectthetemperatureoffsetofdynamicpressur

32、esens.7.1.4.2CombustionChamberDynamicPressureSens—Acalibratedsensinstalledtomeasurethepressurewithinthecombustionchamber.7.1.4.3SamplePressureSens—Acalibratedsensinstalledtomeasurethepressureofthesampleinjectedintothecom

33、bustionchamber.7.1.4.4NitrogenPressureSens—Asensinstalledtomeasuretheinletpressurefromthenitrogenregulat.7.1.4.5CombustionChamberInnerWallTemperatureSens—TypeKthermocouplewithastainlesssteelsheath.7.1.4.6InjectNozzleCool

34、ingJacketTemperatureSens—TypeKthermocouplewithstainlesssteelsheathedintheinjectnozzlecoolantpassage.7.1.5ComputerizedControlDataAcquisitionDataAnalysisReptingSystem—Amicroprocesscontrolledsystemwithakeyboardfmanualentryo

35、foperatinginstructionsanLCDmonitfvisualobservationofalltestingfunctionsaprinterfprintedcopyoutputoftestresults.Thecomputerbasedsystemprovidesautomatedcontroloftherelevantcombustionanalyzersubsystemcomponentfunctionscolle

36、ctsprocessesallrelevantsignalsfromthetemperaturepressuresenss.7RossStephen“Peirce’sCriterionftheEliminationofSuspectExperimentalData”JournalofEngineeringTechnologyFall2003.8Supptingdata“SunlightAirExposureEffectsonOctane

37、NumberCetaneNumberofPetroleumProductSamples”havebeenfiledatASTMInternationalHeadquartersmaybeobtainedbyrequestingResearchReptRR:D021502.9Thesolesourceofsupplyoftheanalyzerdescribedinthismethodknowntothecommitteeatthistim

38、eisPACLP8824FallbrookDriveHoustonTX77064.IfyouareawareofalternativesupplierspleaseprovidethisinfmationtoASTMInternationalHeadquarters.Yourcommentswillreceivecarefulconsiderationatameetingoftheresponsibletechnicalcommitte

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