预览加载中，请您耐心等待几秒...

农业废弃物的热解特性分析及动力学模拟(英文).docx

预览
1/2
2/2

在线预览结束，喜欢就下载吧，查找使用更方便

下载提示 文本预览

如果您无法下载资料，请参考说明：

1、部分资料下载需要金币，请确保您的账户上有足够的金币

2、已购买过的文档，再次下载不重复扣费

3、资料包下载后请先用软件解压，在使用对应软件打开

农业废弃物的热解特性分析及动力学模拟(英文) AnalysisofPyrolysisCharacteristicsandKineticModelingofAgriculturalWaste Introduction Agriculturalwasteisgeneratedduringfarming,harvesting,andprocessingoperations.Thedisposalofagriculturalwastehasbecomeasignificantproblemgloballyasitcontributestoenvironmentalpollutionandgreenhousegasemissions.Pyrolysis,athermaldecompositionprocess,isapromisingapproachtoconvertagriculturalwasteintousefulproductslikebiochar,bio-oil,andsyngas.Theobjectiveofthisstudyistoanalyzethepyrolysischaracteristicsofagriculturalwasteanddevelopakineticmodeltopredictthepyrolysisbehavior. ExperimentalSetup Theagriculturalwastesampleswereobtainedfrommaizestalks,ricehusks,andwheatstraw.Thesamplesweregroundandsievedtoaparticlesizeof2-3mm.Thepyrolysisexperimentswereconductedusingafixed-bedreactorundernitrogenatmosphereataflowrateof100ml/min.Thetemperaturerangewas400-700°C,andtheheatingratewas10°C/min.Theproducedgaseswerecollectedandanalyzedusingagaschromatographequippedwithathermalconductivitydetector(TCD)andflameionizationdetector(FID).Thebiocharyieldwasdeterminedbyweighingtheresidualsolid. ResultsandDiscussion Thepyrolysisofagriculturalwastereleasedgasessuchascarbondioxide,carbonmonoxide,methane,andhydrogen.Thegasyieldsincreasedwithincreasingtemperature,butthebiocharyielddecreased.Maizestalkhadthehighestbiocharyield,followedbywheatstrawandricehusks.Themaximumbiocharyieldswereobtainedat400-500°C,andthedegradationofthebiocharincreasedathighertemperatures.Thebio-oilyieldpeakedat500-550°C,andthehigherheatingvalue(HHV)ofthebio-oilwashighestformaizestalks. Thepyrolysiskineticsofagriculturalwastewasanalyzedusingthefirst-orderreactionmodel.Themodeldescribedtheconversionofthesolidfractionintogasandcharthroughasinglereactionrateconstant(k).Thekineticparameterswereestimatedusingthenonlinearregressionmethod.Theactivationenergy(Ea)valuesforthethreeagriculturalwastesampleswere109.7kJ/molformaizestalks,112.3kJ/molforwheatstraw,and97.9kJ/molforricehusks.Thecalculatedkineticmodelwasfoundtobeingood