柴油机的性能和预热麻风树油外文文献翻译资料Word格式.docx

柴油机的性能和预热麻风树油外文文献翻译资料Word格式.docx

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oilusingwasteheatfromexhaustgas[J].Energy,2015,7

（1）:

616-632.

CombustionandperformanceofadieselenginewithpreheatedJatrophacurcas 

oilusingwasteheatfromexhaustgas

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 

C）leadstounsuitablepumpingandfuelspraycharacteristics.Forlongrunning,straightvegetableoilsarenotsuitableasfuelsfordieselengines,theyhavetobemodifiedtobringtheircombustionrelatedpropertiesclosertodiesel.Undoubtedly,transesterificationiswellacceptedandbestsuitedmethodofutilizingvegetableoilsinCI（compressionignition）enginebutthisaddsextracostofprocessingbecauseofthetransesterificationreactioninvolvingchemicalandprocessheatinputs.Theotheralternativecouldbeuseofheatedvegetableoilsaspetroleumfuelsubstitute.Further,heatingofoilusingexhaustgasfromadieselengineisanattractiveproposition.

TheviscosityofJatrophaoilwasdecreasedremarkablywithincreaseintemperatureanditbecameclosetodieselattemperatureabove75 

C 

[3].ThedensityofJatrophaoilwasreducedfrom900.21 

kg/m3 

to883.97 

byraisingthetemperatureofoilfrom15 

Cto90 

[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