Co-pyrolysis of biomass and coal in a free fall reactor

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1、Fuel86(2007)353–359www.fuelfirst.comCo-pyrolysisofbiomassandcoalinafreefallreactorLiZhang,ShaopingXu*,WeiZhao,ShuqinLiuStateKeyLaboratoryofFineChemicals,DepartmentofChemicalEngineering,DalianUniversityofTechnology,158ZhongshanRoad,POBox33,Dalian116012,ChinaReceived23March2006;receivedinrevisedf

2、orm5July2006;accepted5July2006Availableonline14August2006AbstractAnexperimentalstudyonco-pyrolysisofbiomassandcoalwasperformedinafreefallreactorunderatmosphericpressurewithnitro-genasbalancegas.ThecoalsampleselectedwasDayanlignite,whilethebiomassusedwaslegumestraw.Theoperationtemperaturewasove

3、rarangeof500–700°C,andtheblendingratioofbiomassinmixtureswasvariedbetween0and100wt.%.Theresultsindicatedthatthereexistsynergeticeffectsintheco-pyrolysisofbiomassandcoal.Underthehigherblendingratioconditions,thecharyieldsarelowerthanthetheoreticalvaluescalculatedonpyrolysisofeachindividualfuel,a

4、ndconsequentlytheliquidyieldsarehigher.Moreover,theexperimentalresultsshowedthatthecompositionsofthegaseousproductsfromblendedsamplesarenotallinaccordancewiththoseoftheirparentfuels.TheCO2reactivitiesofthecharsobtainedfromtheco-pyrolysisunderthehigherblendingratio(around70wt.%)conditionsareabo

5、uttwiceashighasthoseofcoalcharalone,evenhigherthanthoseofbiomassalone.Ó2006ElsevierLtd.Allrightsreserved.Keywords:Coal;Biomass;Co-pyrolysis1.Introductioningliquidfuelsandotherchemicals,buttheyieldsoftheseproductsarelimitedbecauseofthelowhydrogen-to-Greatconsumptionoffossilfuelsandincreasingcon

6、-carbonratioincoal.Accordingly,itisnecessarytosupplycernovertheenvironmentalpollutionhavebeenpromot-H2forcoalfromotherresources.Theco-utilizationofcoalinganurgentsearchfornewandcleanerenergy.withhydrogen-richmatterssuchasbiomassandotherComparedwithpetroleumandnaturalgas,whichareinorganicwastes

7、offersanumberofadvantages.Previousdeepershortages,theamountofcoaldepositisabundant.studiesontheco-pyrolysisofcoalwithplasticwastes,poly-BasedonBPstatisticalreviewofworldenergy2005[1],mers,petroleumresidues,coke-ovengasandothermateri-thew