柴油机的性能和预热麻风树油外文文献翻译资料.docx

柴油机的性能和预热麻风树油外文文献翻译资料.docx

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柴油机的性能和预热麻风树油外文文献翻译资料

文献出处：

PriyabrataPradhan,HifjurRaheman, DebasishPadhee.CombustionandperformanceofadieselenginewithpreheatedJatrophacurcas oilusingwasteheatfromexhaustgas[J].Energy,2015,7

（1）:

616-632.

CombustionandperformanceofadieselenginewithpreheatedJatrophacurcas oilusingwasteheatfromexhaustgas

PriyabrataPradhan,HifjurRaheman, DebasishPadhee

Abstract

TheviscosityanddensityofCJO（crudeJatrophaoil）werereducedbyheatingitusingtheheatfromexhaustgasofadieselenginewithanappropriatelydesignedhelicalcoilheatexchanger.ExperimentswereconductedtoevaluatethecombustioncharacteristicsofaDI（directinjection）dieselengineusingPJO（preheatedJatrophaoil）.Itexhibitedamarginallyhighercylindergaspressure,rateofpressureriseandheatreleaserateascomparedtoHSD（highspeeddiesel）duringtheinitialstagesofcombustionforallengineloadings.IgnitiondelaywasshorterforPJOascomparedtoHSD.TheresultsalsoindicatedthatBSFC（brakespecificfuelconsumption）andEGT（exhaustgastemperature）increasedwhileBTE（brakethermalefficiency）decreasedwithPJOascomparedtoHSDforallengineloadings.ThereductionsinCO2 （carbondioxide）,HC（hydrocarbon）andNOx（nitrousoxide）emissionswereobservedforPJOalongwithincreasedCO（carbonmonoxide）emissionascomparedtothoseofHSD.

Keywords:

Combustion; Heatexchanger; Performance; PreheatedJatrophaOil; Reducedemissions

1.Introduction

Therapiddepletionofconventionalfuelandfluctuationofdieselpriceintheglobalmarkethavepromotedresearchforalternativefuelsfordieselengine.Amongthedifferentalternativefuels,vegetableoilhavingfuelpropertiessimilartodieselhasanacceptableengineperformanceforshort-termoperationonly [1].However,longtermendurancetestswithvegetableoilreportedsomeenginedurabilityissuessuchassevereenginedeposits,pistonringsticking,injectorchoking,gumformationandlubricatingoilthickening [2].Theseproblemsareprimarilyattributedtohighviscosityandpoorvolatilityofstraightvegetableoilsduetolargemolecularweightandbulkymolecularstructure.Higherviscosityofvegetableoil（30–200 cStat40 °C）ascomparedtomineraldiesel（4 cStat40 °C）leadstounsuitablepumpingandfuelspraycharacteristics.Forlongrunning,straightvegetableoilsarenotsuitableasfuelsfordieselengines,theyhavetobemodifiedtobringtheircombustionrelatedpropertiesclosertodiesel.Undoubtedly,transesterificationiswellacceptedandbestsuitedmethodofutilizingvegetableoilsinCI（compressionignition）enginebutthisaddsextracostofprocessingbecauseofthetransesterificationreactioninvolvingchemicalandprocessheatinputs.Theotheralternativecouldbeuseofheatedvegetableoilsaspetroleumfuelsubstitute.Further,heatingofoilusingexhaustgasfromadieselengineisanattractiveproposition.

TheviscosityofJatrophaoilwasdecreasedremarkablywithincreaseintemperatureanditbecameclosetodieselattemperatureabove75 °C [3].ThedensityofJatrophaoilwasreducedfrom900.21 kg/m3 to883.97 kg/m3 byraisingthetemperatureofoilfrom15 °Cto90 °C [4].HeatingtheJatrophaoilbetween90 °Cand100 °Cwasadequatetobringdowntheviscosityincloserangetodiesel [5].Chauhanetal. [6] reducedtheviscosityofoilbyheatingfromexhaustgasesbeforefeedingtotheenginewithanappropriatelydesignedshellandtubeheatexchangerwithexhaustbypassarrangement.Further,optimalfuelinlettemperaturewasfoundtobe80 °CconsideringtheBTEandBSEC（brakespecificenergyconsumption）.However,combustioncharacteristicsofJatrophaoilhadnotbeenreported.Theignitiondelaywasshorterforneatrapeseedoilanditsblendswithdieselascomparedtothatofstandarddiesel.Peakcylinderpressureandmaximumheatreleaserateweredecreasedwithincreaseinneatrapeseedoilcontentinblends [7].Qietal. [8] reportedsimilarkindofresultsusingSoybeanbiodieselandblendswithdiesel.

Inrecentyears,severalattemptshavebeenmadetousetheestersofnon-edibleoilsassubstitutefordiesel.Hence,itwasdecidedtochooseonesuchnon-edibleoillikeJatrophaforfurtherinvestigationwhichcouldprovideasuitablesubstitutefordieselfuel.

Jatrophaoilcontainshigherpercentageofoleicacid（34.3–45.8）followedbylinoleicacid（29.0–44.2）andpalmiticacid（14.1–15.3）.Theaveragesaturatedandunsaturatedfattyacidsconstitute20.1%and79.9%oftheoil,respectively.Thematuritystageofthefruitsatthetimeofcollectionisreportedtoinfluencethefattyacidcompositionoftheoil [9].Becauseofthepresenceofhigherpercentageoffreefattyacids,itisnotdesirabletorunthedieselenginedirectlywithJatrophaoil.Thereforeanattemptwasmadetoutilizetheheatfromexhaustg