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外文翻译--使用旋流器对废食用油脱水净化 英文版.pdf

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外文翻译--使用旋流器对废食用油脱水净化 英文版.pdf

ThisarticlewasdownloadedbyXianJiaotongUniversityOn13March2013,At0054PublisherTaylorFrancisInformaLtdRegisteredinEnglandandWalesRegisteredNumber1072954RegisteredofficeMortimerHouse,3741MortimerStreet,LondonW1T3JH,UKInternationalJournalofGreenEnergyPublicationdetails,includinginstructionsforauthorsandsubscriptioninformationhttp//www.tandfonline.com/loi/ljge20DehydrationofWasteEdibleOilbyHydrocyclonesZ.Baia,H.WangaS.TuaaKeyLabofSafetyScienceofPressurizedSystem,MinistryofEducationSchoolofMechanicalandPowerEngineering,EastChinaUniversityofScienceandTechnology,Shanghai,ChinaVersionofrecordfirstpublished07Apr2009.TocitethisarticleZ.Bai,H.WangS.Tu2009DehydrationofWasteEdibleOilbyHydrocyclones,InternationalJournalofGreenEnergy,62,184191Tolinktothisarticlehttp//dx.doi.org/10.1080/15435070902785001PLEASESCROLLDOWNFORARTICLEFulltermsandconditionsofusehttp//www.tandfonline.com/page/termsandconditionsThisarticlemaybeusedforresearch,teaching,andprivatestudypurposes.Anysubstantialorsystematicreproduction,redistribution,reselling,loan,sublicensing,systematicsupply,ordistributioninanyformtoanyoneisexpresslyforbidden.Thepublisherdoesnotgiveanywarrantyexpressorimpliedormakeanyrepresentationthatthecontentswillbecompleteoraccurateoruptodate.Theaccuracyofanyinstructions,formulae,anddrugdosesshouldbeindependentlyverifiedwithprimarysources.Thepublishershallnotbeliableforanyloss,actions,claims,proceedings,demand,orcostsordamageswhatsoeverorhowsoevercausedarisingdirectlyorindirectlyinconnectionwithorarisingoutoftheuseofthismaterial.DEHYDRATIONOFWASTEEDIBLEOILBYHYDROCYCLONESZ.Bai,H.Wang,andS.TuKeyLabofSafetyScienceofPressurizedSystem,MinistryofEducationSchoolofMechanicalandPowerEngineering,EastChinaUniversityofScienceandTechnology,Shanghai,ChinaWasteedibleoilisthehighqualitymaterialfromwhichbiodieselfuelscanbemade.Thewaterdropletsinwastededibleoilaffecttheprocessingcoursesandtheproductquality.Anewprocessofwasteedibleoildehydrationbasedonhydrocyclonetechnologyhasbeendesigned.Preliminaryindustrialexperimentshavebeencarriedouttoprovethefeasibilityofdehydrationusingahydrocyclone.Theeffectsofseveraldimensionlessunits,suchasReynoldsnumber,Eulernumber,andpressuredropratio,werestudied.AnincreaseinReynoldsnumberwilldecreasethepressuredropratio.WithanincreaseintheReynoldsnumber,theEulernumberincreasesgradually.UndertheconditionthattheReynoldsnumberofinletisrangingfrom5,000to5,800,thewaterconcentrationcandecreasefrom0.5–3.0vol.tolessthan0.30vol..KeywordsHydrocycloneseparationDehydrationWasteedibleoilINTRODUCTIONTheamountofwasteedibleoilcollectedinalltheEuropeanUnionwasestimatedtobeabout400,000tons.However,itispredictedthatthecollectionofvegetableoilwillriseandmayreachamountsbetween700,000and1,000,000tons,and90ofthoseedibleoilswillbedumpedasrefusewithoutcollectionAyhan,2007Pintoetal.2005.Itisunreasonablefromtheviewpointofresourcesavingthatmostofthewasteedibleoilisdumpedwithoutbeingutilizedwiththeexceptionthatasmallpercentageofwasteedibleoilisrecycledasarawmaterialofsoap.Moreover,whenthewasteedibleoilisincineratedtogetherwithcombustiblerefuse,alargeamountofsuspendedparticulatematter,suchasSOx,NOx,CO2,andCOturningtoairpollutantsareproduced,anditisreportedthatdeadlypoisonousdioxinmaybeproduced.Ontheotherhand,whenthewasteedibleoilisburiedtogetherwithnoncombustiblerefuse,soilpollutionoccurs.Apartofthewasteedibleoildumpedfromrestaurants,foodplantsandhomesisactuallydischargedintoriversandlakesandisoneofthemajorcausesofwaterpollution.Inthissense,transesterificationofwasteedibleoilstoproducebiodieselcoulddecreasethewastedisposalproblem.Thewasteedibleoilsservingasrawmaterialincludewrapeseedoil,sesameoil,soybeanoil,maizeoil,sunfloweroil,palmoil,palmkerneloil,coconutoil,InternationalJournalofGreenEnergy,6184–191,2009CopyrightC211TaylorFrancisGroup,LLCISSN15435075print/15435083onlineDOI10.1080/15435070902785001AddresscorrespondencetoH.Wang,SchoolofMechanicalandPowerEngineering,EastChinaUniversityofScienceandTechnology,130MeilongRoad,Shanghai200237,PRChina.Emailfbaizsyahoo.com.cn184DownloadedbyXianJiaotongUniversityat005413March2013cornoil,saffloweroil,etc.,andeitheroneofthemoramixtureofthementionedoilsisemployedasarawmaterial.Thereisnoparticularrequirementregardingthequalityofoil,butitisgenerallypreferablethatthebleoilhaslowcontentofwaterandsolidcomponent.Thesedimentationmethodisatypicalmethodofdewateringwasteedibleoil.Butlowefficiencyandlargesizearegreatdisadvantagestothesedimentationmethod.Manyresearcheffortshavebeentakentostudythedewateringofwasteedibleoilandgainedconsiderableprogress,includingthecentrifugemethodWangetal.1997,filtrationmethodGuuetal.1997Tanaka,2004Tirmizietal.1996,magnetichandlingmethodFreemanetal.1994Shenetal.,1990,anddirectcurrenthydrocyclonemethodPratarnetal.2005Pratarnetal.2006.Butthosetechniqueswerelessusedinindustrialproductionbecauseofthecomplexityoftheequipmentandlowreliability.Thenanewprocessofwasteedibleoildehydrationthatisbasedonhydrocyclonetechnologywasdesigned.Preliminaryexperimentshavebeencarriedouttoprovethefeasibilityofdehydrationusinghydrocyclone.Wedemonstrateherethatwaterwasbeingremovedsuccessfullyinwasteedibleoilthroughhydrocyclones.FUNDAMENTALSOFDEHYDRATIONWITHHYDROCYCLONEPrincipleofHydrocycloneSeparationAhydrocycloneisadevicethatcausesthecentrifugalseparationofmaterialscontainedintheliquidfedtoitBaietal.2006Cullivan,etal.2003Firth2003Habibianetal.2008.Thesematerialsarenormallyintheformofsolidparticlesbutmayalsobegasbubbles,oil,orothers.Thefeedsareseparatedbytheinducedcentrifugalforceinsidethehydrocyclonebodyandmainlyaccordingtotheirdensity,size,andshape.Unlikeothercentrifugalmachines,hydrocycloneshavenomovingparts.Theseparationdrivingforcecomesfromthetransformationofthestaticenergyofthefluidfluidpressureintodynamicenergyfluidvelocity.Ahydrocyclonebodyconsistsoftwopartsacylindricalpartandaconicalpart.Designdependsonboththenatureoftheseparationandthequalityofeffluentdesired.Theapplicationsofhydrocyclonesareprincipallytheseparationofsolidsuspendedmatterandtheclarificationofliquidphases.Figure1showstheoperationofahydrocyclonedesignedforliquidliquidseparation.Thefluidisinjectedtangentiallyatthetopofthehydrocycloneandcausecentrifugalforcestoaccelerateparticlestowardthewalls.Asthefluidpassesthroughthehydrocycloneinaspiralfashion,largeordenseparticlesareforcedagainstthewallandmigratedownwardstotheunderflow.Fineorlowdensityparticlesaresweptintoasecondinnerspiralthatmovesupwardtotheoverflow.FlowSplitandPressureDropRatioFlowsplitofthehydrocycloneisdefinedtheratioofthevolumeflowoftheunderflowtofeed,i.e.,R¼QuQi1001whereRistheflowsplit,andQuandQiareindividuallythevolumeflowoftheunderflowandfeed.Undernormaloperatingconditions,therearetwodistinctpressuredropsacrossthehydrocycloneseparatorDEHYDRATIONOFWASTEEDIBLEOILBYHYDROCYCLONES185DownloadedbyXianJiaotongUniversityat005413March2013C1pio¼piC0po2andC1piu¼piC0pu3wherepi,po,puarethepressureinthefeed,overflow,andunderflow,respectively.Therelationshipbetweenthetwopressuredropsisalsoimportantandcanbeusedforcontrolpurposes.ThepressuredropratioPR¼C1pioC1piu.ReynoldsNumberThehydrocyclonecharacteristicReynoldsnumbercouldbedescribedasfollowsRe¼C26DvC224whereDisthehydrocyclonediameterC26andC22arethedensityandviscosityofliquid,respectivelyandvisthehydrocyclonecharacteristicvelocity4QiC25D2.EulernumberThehydrocycloneoverflowcharacteristicEulernumbercouldbedescribedasfollowsEu¼piC0poC26v225UnderflowOverflowFeedInnerSpiralOuterSpiralFigure1Fluidflowinhydrocyclone.186BAI,WANG,ANDTUDownloadedbyXianJiaotongUniversityat005413March2013

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