玉米秸秆及其发酵沼渣热解动力学研究

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1、StudyonKineticsofthePyrolysisofCornStoverandItsFermentationResidueWANGFangZHANGDeliGAOZixiangYiWeimingSchoolofAgriculturalEngineeringandFoodScience,ShandongUniversityofTechnology;Abstract：Thepyrolysischaracteristicsoffermentationresidueofcornstoverwasanalyzedinthispaper.Thepyrolysiskinetics

2、werestudiedwiththeFWOandStarinkmethods.ThemostprobablemechanismfunctionofpyrolysisalsowasevaluatedbyMalekmethod.Theeffectofanaerobicdigestiontocornstoverwasdeducedbycomparedwiththeuntreatedcornstover.Theresultsofproximateandultimateanalysisshowedthatthevolatilecontentoffermentationresiduede

3、creasedby19.48%comparedwiththeuntreatedcornstoverandthefixedcarboncontentincreasedby27.87%.Theoxygencontentwasdecreasedby24.25%,whichisanadvantageforpyrolysis.Theanalysisoflignocelluloseillustratedthatcelluloseandhemicellulosedecreasedby39.94%and30.96,respectively,whiletheligninincreasedby1

4、09.14%,whichcontributedtothemaximumweightlossrateoffermentationresiduedecreasingandthecarbonyieldwasmuchhigherafterpyrolysis.Theresultsofpyrolysiskineticsshowedtheactivationenergyoffermentationresiduewas91-130kj/mol,whichwaslowerthancornstover.Themechanismfunctioncurveoftwosampleshadsimilar

5、trends,thatcanbedividedintotwoparts.Whentheconversionratio(a)waslessthan0.6，theycanbeillustratedbyorderofreaction(n=2)mechanismmodel.Whentheconversionratio(a)wasmorethan0.6,thepyrolysisofcornstoverwasinaccordwiththecylindricalsymmetricthree-dimensionaldiffusionmechanism(D4),while,fermentati

6、onresiduewasmoreinclinedtothesphericalsymmetricthree-dimensionaldiffusionmechanism(D3).Thisstudycanprovideatheoreticalbasisforoptimizationofprocessconditionsandindustrialapplicationoffermentationresidueturningtobio-fuel.Keyword：cornstover;fermentationresidue;pyrolysischaracteristic;kinetics

7、;Received：2017-05-23引言农作物秸杆作为可再生能源物质，是厌氧消化产沼气的重要原料。秸秆类原料沼气发酵过程只能转换部分纤维素和半纤维素，大量的有机物质仍存在于发酵残余物中。目前，沼渣多用于土壤肥料与养殖业等方面，但由于发酵残留物本身可能会存在重金属和病原菌等有害物质，大量施用会对食品安全以及生态环境造成潜在的不良影响111。而H，农作物废弃物作为厌氧发酵原料所产沼渣可能会存在痕量的除草剂和杀菌剂等。所以，无论发酵沼渣作为饲料用于养殖业屮，还是作为基肥施用于土壤中，大量施用均会带来许多负