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简介:Inthisarticle,theFCCdieselfuelischemicallytreatedwithGZreagent.Theexistentgum,insolublesafteroxidation,andiodinemunberaregreatlyreducedafterchermicaltreatment.Thismethodhasagoodeffectandissimple.Thismethodischaracterizedbyhighrecoveryrateoffuel(>99.7?andlowcost.Thepropertyofthemixtureofchemicallytreateddieselfuelwithstraight-rundieselfuelcanmeettherequirementsofnationalstandardGB252-2000.Thecolorandoxidationstabilityofthemixedfuelafterhavingbeenstoredforthreemonthswerestilllowerthanthevaluesspecifiedinthenationalstandard.
简介:WITElectronicFuelSystemCo.,Ltd.hasdevelopedanewfuelinjector,theElectronicIn-linePump(EIP)system,designedtomeetChina’sdieselengineemissionandfueleconomyregulations.ItcanbeusedonmarinedieselenginesandcommercialvehicleenginesthroughdifferentEIPsystems.AnumericalmodeloftheEIPsystemwasbuiltintheAMESimenvironmentforthepurposeofcreatingadesigntoolforengineapplicationandsystemoptimization.Themodelwasusedtopredictkeyinjectioncharacteristicsunderdifferentoperatingconditions,suchasinjectionpressure,injectionrate,andinjectionduration.Tovalidatethesepredictions,experimentaltestswereconductedundertheconditionsthatweremodeled.Theresultswerequiteencouragingandinagreementwithmodelpredictions.AdditionalexperimentswereconductedtostudytheinjectioncharacteristicsoftheEIPsystem.Theseresultsshowthatinjectionpressureandinjectionquantityareinsensitivetoinjectiontimingvariations,thisisduetothedesignoftheconstantvelocitycamprofile.Finally,injectionquantityandpressurevs.pulsewidthatdifferentcamspeedsarepresented,animportantinjectioncharacteristicforEIPsystemcalibration.
简介:Dieselsootisrelatedtoincompletefueloxidation,andpossessesthewell-knownmutageniceffectsonhumanhealth.Dieselsootwascollectedfromdieselenginesandoxidizedinlaboratorialmicroreactorbyseveralpreparedrareearth-basedcatalystswithorwithoutdifferentharmfulmonoxidegasessuchasNO,andactivitiesofseveralrareearthcatalystswerestudied.Theresultsindicatethatsootcanbemoreeasilyoxidizedwithmonoxidegases.
简介:Theneedforcleanerfuelshasresultedinacontinuingworldwidetrendtoreducedieselsulfurandaromatics.Therearemanyapproachestoreducingsulfurandaromaticsindiesel.Mostofthemhaveacommondrawbackofhighcostbecauseofadoptingtwostagesofhydrotreatingandusingnoble-metalcatalyst,especiallyforreducingaromatics.TheattempttoresolvethisissuehasledtotherecentdevelopmentoftheSingleStageHydrotreating(SSHT)processbyResearchInstituteofPetroleumProcessing(RIPP),SINOPEC.TheSSHTprocessisasingle-stagehydrotreatingtechnologyforproducinglowsulfurandlowaromaticsdiesel.Theprocessusesoneortwonon-noble-metalcatalystssystemandoperatesatmoderatepressure.Whenrevampinganexistingunittomeetlowaromaticsdieselspecification,theonlythingtodoistoaddareactororreplacetheexistingreactor,Inpilotplanttests,theSSHTtechnologyhassuccessfullytreatedSRGO(StraightRunGasOil),LCO(LightCycleOil)ortheblendofthem.ItisshownthatbyusingtheSSHTprocessdieselwithsulfurof30ppmandaromaticsof15m%canbeproducedfromMiddle-EastSRGOanddieselwitharomaticscontentof25m%canbeproducedfromcrackedfeed,suchasFCC-LCO.Highdieselyieldandcetanenumbergain(fromcrackedfeedstocks)givetheSSHTtechnologyaperformanceadvantagecomparedtoconventionalhydrocrackingandhydrotreatingprocesses.Thelowerinvestmentandoperatingcostisanotheradvantage.ThefirstcommercialapplicationoftheSSHTtechnologyhasbeeninoperationsinceSeptember2001.
简介:Dependentonautomaticallygeneratedunstructuredgrids,acomprehensivecomputationalfluiddynamics(CFD)numericalsimulationisperformedtoanalyzetheinfluenceofnozzlegeometryontheinternalflowcharacteristicsofamulti-holedieselinjectorwiththemulti-phaseflowmodelbasedonEulerianmulti-fluidmethod.Thedieselcomponentsinnozzleareconsideredastwocontinuousphases,dieselliquidanddieselvaporrespectively.Consideringthatbothofthemarefullycoupledandinterpenetrated,sepa...
简介:Anewcontinuousprocessforpreparingmethanol-dieselemulsifiedfuelwithanImpingingStream-RotatingPackedBedisproposed.Thedropletsizeofdispersedphase(methanol)oftheemulsifiedfuelhasasignificanteffectonthecombustionofmethanol-dieselemulsifiedfuel.Inthispaper,themethanol-dieselemulsifiedfuelusesdieselasthecontinuousphaseandmethanolasthedispersedphase.TheSautermeandiameterofthedispersedphaseofmethanol-dieselemulsifiedfuelwascharacterizedwithmicrophotographyandarithmeticmethod.TheexperimentalresultshowedthattheSautermeandiameterofthedispersedphase,whichwasdecreasedwiththeaugmentationofthehighgravityfactor,liquidflowrateandemulsifierdosage,wasinverselyproportionaltothemethanolcontent.TheSautermeandiameterofthedispersedphasecanbecontrolledandadjustedintherangeof12—40μmthroughthechangeofoperatingconditions.ThecorrelativeexpressionsoftheSautermeandiameterofemulsifiedfuelwereobtainedandthecalculatedvaluesagreedwellwiththeexperimentalvalues.
简介:Themarinemedium-speeddieselenginesarestartedbytwomethods;oneistheelectricmotors,andtheotherairstartingmotors.Eventhoughairstartingmotorisdependentoftheenginetypesandsizes,ithasbeenwidelyusedinthisareaduetoitssimplicity,convenienceandreliability.Thepurposeofthispaperistogivethedesigningparametersinordertomakeaproper'AirStartingMotor'usingCFD.Theaerodynamicapproachesweregiventounderstandtheinternalflowcharacteristicsoftheairstartingmotor.Inaddition,wehavecarriedouttheinvestigationofeffectsoftipclearance.Inthecalculationsthetipclearanceofairstartingmotorhasbeenvariedbetween0,2.8,4.3and5.7%ofbladespan.Theresultsofcomputationarethetipclearanceincreasedto2.8%,thetorquedecreased24%,andtherewasnomorelargechangeswhentheclearancesincreasedto4.3%and5.7%.
简介:基于小浪包转变(WPT),基因算法(GA),神经网络(BPNN)和支持向量用机器制造的背繁殖(SVM),柴油机引擎阀门清理的一个差错诊断方法被介绍。与力量光谱密度分析,与运用条件的引擎有关的典型频率能从颤动信号被提取。小浪系数和根的最大的单个值(BSV)意味着在典型频率亚乐队的颤动的平方(RMS)值在颤动信号的第三水平分解的目的被提取,并且他们被用作BPNN或SVM的输入向量。为了避免,在本地最小被套住,GA被采用。正常和处于不同阀门清理条件测量的差错颤动信号被分析。BPNN,GA背繁殖神经网络(GA-BPNN),SVM和GA-SVM被用于为不同特征的抽取训练并且测试,并且分类精确性和训练时间与相比决定最佳差错分类器和特征选择。试验性的结果证明建议特征和分类算法给100%的分类精确性。