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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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