基于微波诱导定向加热的污泥新型热解方法能耗分析

化工学报2019年第70卷第S1期,2019,70(S1):168-176|www.hgxb.com.cnCIESCJournal基于微波诱导定向加热的污泥新型热解方法能耗分析王超前，王文龙，李哲，孙静，宋占龙，赵希强，毛岩鹏（山东大学燃煤污染物减排国家工程实验室，山东省能源碳减排技术与资源化利用重点实验室，山东济南250061）摘要：针对现有污泥热解技术耗时耗能、炭性能受限等难题，提出微波诱导协同热解的新型技术思路，即仅先用常规初级热解获得微波强化吸收的热解基体，再用微波诱导其高能位点效应，以期低能耗制备较高性能的污泥炭。对样品进行介电特性、工业分析等多种测试，在简要分析并验证该思路可行的基础上，探寻其能耗机制，以期为实际应用提供参考。结果表明，通过常规700℃热解10min的热解基体，介电特性提高约22%，可在微波900W中5min升高到平均900℃；不仅提高炭性能，而且比常规700℃热解60min节能省时达50%以上，这主要归因于对热解过程整体用时的显著缩减与微波能的高效利用。研究思路为低能耗制备高附加值污泥炭奠定工艺应用基础，有望实现污泥大规模资源化处置。关键词：废物处理；热解；辐射；市政污泥；微波诱导协同热解；节能中图分类号：X705；TM25文献标志码：A文章编号：0438⁃1157（2019）S1-0168-09Energyconsumptionanalysisofnovelpyrolysismethodofsewagesludgebasedonmicrowave-inducedtarget-orientedheatingWANGChaoqian,WANGWenlong,LIZhe,SUNJing,SONGZhanlong,ZHAOXiqiang,MAOYanpeng(NationalEngineeringLaboratoryofCoal-firedPollutantsEmissionReduction,ShandongProvincialKeyLaboratoryofEnergyCarbonReductionandResourceUtilization,ShandongUniversity,Jinan250061,Shandong,China)Abstract:Therearemanydifficultiesofcurrentresearchonsewagesludgepyrolysis,suchastimeconsuming,highenergyconsumptionandlimitationofcharproperties.Tosolvethosedifficulties,thispaperprovidesanoveltechnicalapproachofmicrowave-inducedsynergisticpyrolysis.Namelywithoutaddingextramicrowaveabsorbent,semi-pyrolyticsludgecharcanbeobtainedbypre-pyrolysisofsewagesludgeitselfunderconventionallowenergyconsumption;thenitisusedasbasalbodytobepyrolysedundermicrowave,whichisbasedonin-situcarbonationenhancementbyhigh-energy-siteeffectsandheavymetalsolidificationviavitrification;finally,highlystablesludgecharisexpectedtobeproducedwithlowenergyconsumptioninthenovelprocess.Thepapertestedthedielectricproperties,proximateanalysis,toxicitycharacteristicleachingprocedure,specificsurfaceareaandSEMimagesofsewagesludgematerials.Bybriefanalysisandverificationoffeasibilityofthenovelapproach,itsenergyconsumptionmechanismwasfocusedon,whichwillcontributetopracticalapplication.Inthisexperiment,semi-pyrolyticsludgecharproducedbypre-pyrolysis(700℃,10min)couldincreasewholedie