自由落下床中生物质与煤共热解的协同效应对焦油组成的影响.pdf

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1、第4o卷第5期燃料化学学报Vol_40No．52012年5月JournalofFuelChemistryandTechnologyMay2012文章编号：0253-2409(2012)05-0519-07自由落下床中生物质与煤共热解的协同效应对焦油组成的影响魏立纲，张丽，徐绍平(I．大连理工大学化工学院精细化工国家重点实验室，辽宁大连116024；2．大连工业大学轻512与化学工程学院，辽宁大连116034)摘要：利用溶剂萃取-柱层析方法，将自由落下床中豆秸与大雁褐煤共热解以及单种原料热解的液体产品分为沥青烯、酚类、脂肪烃类、芳香烃类和极性物等组分。结果表明，共热解的沥青烯产率为11．4％，低

2、于根据煤和生物质单独热解的质量加权平均计算值19．0％，且芳香性增大；与计算值相比，低分子量的酚类、甲基苯酚、二甲基苯酚及其衍生物的含量提高了5％；而且长侧链的脂肪烃含量减少。共热解焦油的芳香类组分中十氢萘的质量分数是43．37％，但其在单一原料热解焦油中并没有被检测到。热解油分析结果表明，自由落下床生物质与煤快速共热解过程中存在协同效应，其主要原因是，发生氢解和加氢反应。煤与生物质共热解有利于产生低分子量的化合物，改善油品的质量。关键词：煤；生物质；共热解；焦油中图分类号：TQ536．1文献标识码：AEffectofsynergismbetweenbiomassandcoalduringCO

3、-pyrolysisinafreefallreactorontarcomponentsWEILi—gang，ZHANGLi，XUShao—ping(1．StateKeyLaboratoryofFineChemicals，DepartmentofChemicalEngineering，DalianUniversityofTechnology，Dalian116024，China；2．DepartmentofLightIndustryandChemicalEngineering，DalianPolytechnicUniversity，Dalian116034，China)Abstract：TheH

4、quidproductsfromCO·pyrolysisofDayanlignite(DY)andlegumestraw(LS)andfrompyrolysisofthesinglefuelwereclassifiedintoasphalts，phenols，aliphatic，aromaticsandpolarfractionsbysolventextraction—columnchromatography．Comparedwiththecalculatedyieldofasphalts，i．e．themassweightedmeanvalue19．0％frompyrolysisofthes

5、inglecoalandbiomass．theexperimentalyieldfromCO—pyrolysisdecreasedto11．4％，andthearomaticityoftheCO—pyrolysisasphaltsincreased．Atthesametime，theyieldoffightmolecularweightphenols，methylphenol，dimethyl[Ihenolandtheirderivativesincreasedatabout5％duringtheCO—pyrolysis：whilethecontentofaliphatichydrocarbo

6、nswithlongchainsdecreased．ThecontentofdecalinsWas43．37％inaromaticfractionoftheCO—pyrolysistar，whereasitwasalmostnotfoundinthetarsfrompyrolysisoftheindividualfue1．TheseresultsverifiedthatthesynergyexistedduringCO—pyrolysisofcoalandbiomassundertheexperimentalconditions．Itwascontributedtothereactionssu

7、chashydropyrolysisandhydrogenationduringCO—pyrolysisofcoalandbiomassunderthehydrogenatmospheremainlysuppliedbybiomasspyrolysis．Co—pyrolysisofcoalandbiomassfavorsproducinglowmolecularweightcompoundsand