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页数:5页
时间:2019-08-06
《New distributed activation energy model Numerical solution》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、Availableonlineatwww.sciencedirect.comBioresourceTechnology99(2008)2795–2799Newdistributedactivationenergymodel:NumericalsolutionandapplicationtopyrolysiskineticsofsometypesofbiomassJunmengCai*,RonghouLiuBiomassEnergyEngineeringResearchCenter,SchoolofAgricultureandBiology,ShanghaiJiaoTongUniversity
2、,800DongchuanRoad,Shanghai200240,P.R.ChinaReceived31March2007;receivedinrevisedform19June2007;accepted20June2007Availableonline10August2007AbstractInthepresentpaper,anewdistributedactivationenergymodelhasbeendeveloped,consideringthereactionorderandthedepen-denceoffrequencyfactorontemperature.Thepro
3、posedDAEMcannotbesolveddirectlyinaclosedfrom,thusamethodwasusedtoobtainthenumericalsolutionofthenewDAEMequation.Twonumericalexamplestoillustratetheproposedmethodwerepresented.ThetraditionalDAEMandnewDAEMhavebeenusedtosimulatethepyrolyticprocessofsometypesofbiomass.ThenewDAEMfittedtheexperimentaldata
4、muchbetterthanthetraditionalDAEMasthedependenceofthefrequencyfactorontemperaturewastakenintoaccount.Ó2007ElsevierLtd.Allrightsreserved.Keywords:Distributedactivationenergymodel;Nonisothermalkinetics;Pyrolysis;Biomass1.IntroductionThemostaccurateandup-to-dateapproachformodelingthepyrolysiskineticsof
5、biomassistoadopttheDAEMThescarcityoffossilfuelresourcesandtheincreasein(SonobeandWorasuwannarak,2007).biomasswasteshaveledtorenewedinterestinconvertingTheDAEMwasoriginallydevelopedbyPitt(1962)andthesewastesintousefulenergeticproducts(Jiangetal.,lateradaptedbyAnthonyandHoward(1976).Itdescribes2007).
6、Inrecentyears,thermochemicalprocesseshaveacomplexreactionasanumberofparallelfirst-orderreac-becomesomeofthemostpromisingwaysforobtainingtions,eachoccurringwithitsownratecoefficient.Usually,usefulproductsfromthosebiomasswastes.Thestudyofitisfurtherassumedthatallreactionssharethesamefre-thekineticbehavi
7、oroftheseproductsinthermaldecompo-quencyfactor.Thenth-orderDAEM,aphenomenologicalsitionisfundamentaltotheoptimizationoftheiruse(Con-modelcombiningareactionorderwithanactivationesaetal.,1995).energydistribut
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