生物污泥热解资源化技术研究

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1、艇匾i鳓1■●■■■■■目哗⑧天毕大尊博士学位论文■_■r_●一-■■：I爿j：一■曩■叫o____一级学科：环境科学与工程学科专业：环境工程作者姓名：李海英指导教师：张书廷教授；追+些Z#蠹世睥2006年5月ABSTRACTAsallalternative，thepyrolysisofsewagesludgeisreceivingincreasingattentionasalleconomicandenvironmentallyacceptableroutetOwastedisposal．Thisprocesshasthehighabili

2、tytoconvertsewagesludgetorenewableresource．Inthispaper,thepyrolysisofsewagesludgewassystematicallyinvestigatedunderinertconditionsinafixed-bedbatchpyrolyzingfurnacewhichcansimulatetheengineeringpracticewithobvioustemperaturegradsandreactiontimesegments．Thecharacteristicsofp

3、roductsweredetectedbycalorimeter,elementanalyzer,scanningelectronicmicroscope(SEM)andgasphasechromatographyandthethermogravimetricanalysistechniquesWel-eusedintheresearchofthepyrolyticdecompositionkineticsmechanics．Theeffectsoffinalpyrolysistemperature，heatingrate，reactiont

4、imeandmaterialmoistureontheproductdistributionandcompositionwereresearchedalso．ItWasfoundthatthefinalpyrolysistemperatureWasthemostimportantinfluencingfactorduringtheprocess．WhenthefinaltemperatureWasabove450"C，liquidphase(oil)achievedhi【gheryieldandthehighestyieldswereachi

5、evedat550"C．Themaximumvaluewas43％．Theanalyticalexperimentsandevaluationresultsofoilapprovedthatvaporizedhydrocarbonscontentintheliquidphasewerehigherthancrudeoilandthecompositionsweresimilartodieseloil．SothepyrolysisoilhaspotentialqualitytOinsteadofdieseloil．Theliquidphasep

6、roductioncouldbecomethesaccedaneumofmineralfueliftheyweredisposedproperly．Thecharacteristicsofsolidphaseundermoderatefinalpyrolysistemperaturesvariedfrom250"(2～700"Cwereanalyzed．ItWasfoundthatvolatilemattercontentinsemi-cokereducedbutashandfixedcarboncontentsraisedwiththein

7、creasingoffinalpyrolysistemperature．Becausethesolidphaseathighfinaltemperaturehashigherporosity,thesemi-cokecanadsorbharmfulingredientchlorineandsulfurinNCGAccordingtotheanalysisofNCGtheyieldofC02wasmaximumatlowerpyrolysistemperaturebuttheyieldsofH2、CO、C1-14werehigherthanot

8、hergasesatelevatedpyrolysistemperatureandthecaloricvaluewerehiigheralso．Accordingt