%0 Journal Article
%T KineticModelofBiomassPyrolysisBasedonThree-componentIndependentParallelFirst-orderReactions
%A 王新运
%A 万新军
%A 陈明强
%A 王君
%J 过程工程学报
%D 2012
%X Thepyrolysisbehavioroftwokindsoftypicalbiomass(pinewoodandcottonstalk)wasstudiedinnitrogenatmosphereatvariousheatingratesbythermogravimetricanalysis(TGA).Thepyrolysisprocesscanbedividedintothreestagesevolutionofmoisture(<200℃),devolatilization(200~400℃)andcarbonization(>400℃).ThecomparisonofDTGcurvesoftwobiomassmaterialsshowthatthehigherthehemicellulosecontentofbiomass,themoreevidenttheshoulderpeakofDTGcurve.Theweightlossprocessoftwomaterialswassimulatedbythekineticmodelassumingcellulose,hemicelluloseandligninpyrolyzingindependentlyandinparallel,obeyingfirst-orderreactions.Thepyrolysiskineticparameterscorrespondingtothethreecomponentswereestimatedbythenonlinearleastsquarealgorithm.Theresultsshowthattheirfittingcurvesareingoodagreementwiththeexperimentaldata.Theiractivationenergyvaluesforpinewoodandcottonstalkareintherangeof188~215,90~102,29~49and187~214,95~101,30~38kJ/mol,respectively.Thecorrespondingpre-exponentialfactorsareintherangeof1.8′1015~2.0′1016,1.6′107~7.1′108,9.3′101~1.5′103and1.2′1015~6.7′1017,1.2′108~1.4′109,1.4′102~4.6′102min-1,respectively.Inaddition,theactivationenergyofcelluloseandligninincreasedandtheircontributionstovolatiletendedtofall,whereastheactivationenergyofhemicellulosedecreasedanditscontributiontovolatiletendedtorisewithincreasingofheatingrate.
%K biomass
%K pyrolysis
%K hermogravimetricanalysis
%K kineticmodel
%U http://www.jproeng.com/qikan/Cpaper/zhaiyao.asp?bsid=16715