城市污泥和煤混燃特性的热重分析法研究顾利锋

:2003-02-28;　:2003-04-15:(JS200106);(BS2001029):(1978-),,,.:1001-2060(2003)06-0561-03城市污泥和煤混燃特性的热重分析法研究顾利锋,陈晓平,赵长遂,吴　新(东南大学洁净煤发电与燃烧技术教育部重点实验室,江苏　南京　210096)　:利用热重分析法对某城市污泥和某煤种及其两者混合物的着火温度、活化能及综合燃烧特性等参数进行了研究。试验结果表明,混合试样和煤相比其活化性能得到了提高,着火温度提前,综合燃烧性能下降。在混燃过程中,煤和城市污泥基本上保持了各自的挥发分析出特性,煤的燃烧表现得更为明显。:;;;:TK16　　　:A1　　。,,,。,,、。,,。2　2.1　SetaramTGA92-,、、。::0.1μg;200mg;:±2℃;:～1600℃;:、;:0.01～99.99℃/min。2.2　:200(0.074mm),;:,85mL/min;:6mg;:20℃/min,1000℃5min。2.3　TGDTG、。1。。1　12345(:)1∶02∶11∶11∶20∶1Mad2.184.685.937.179.67/%Aad29.5637.3041.1745.0352.77FCad44.6132.9127.0621.209.50Aad23.6525.1125.8426.6028.06Cad58.8447.1341.2735.4123.70/%Had3.534.104.394.675.24Sad0.560.660.710.760.86Nad0.942.212.853.494.76Oad10.3016.1119.0121.9027.713　3.1　,,:dαdτ=k(1-α)n(1):τ—;k—;n—;α—;:186200311JOURNALOFENGINEERINGFORTHERMALENERGYANDPOWERVol.18,No.6Nov.,2003α=W0-WτW0-Wf(2):W0Wf,Wττ。Arrhenius():k=Ae-ERT(3):A—;E—,R—;T—。:φ=dTdτ(4)(1)～(4),:dαdT=Aφe-ERT(1-α)n(5):∫α0dα(1-α)n=Aφ∫TT0e-ERTdT(6)n=1,[1],:ln-ln(1-α)T2=lnARφE(1-2RTE)-ERT(7)a=lnARφE(1-2RTE),E,a。b=-ER,X=1T,Y=ln-ln(1-α)T2,:Y=a+bX(8),EA。2。2,。3.2　3.2.1　着火温度的确定TG-DTG[2]ti。3.2.2　燃尽温度的确定99%th。3.2.3　综合燃烧特性指数的确定,[3]S:S=(dw/dτ)max(dw/dτ)meanT2iTh(9):S—,(dw/dτ)max,%/min;(dw/dτ)mean,%/min;Ti,K;Th,K。,S。3。1。3.3　3,,390℃280℃,740℃704℃。1,52.77%,,9.50%,,。,,。,,。。2,1()96.1kJ/mol,2(2:1/)56.0kJ/mol,。,,,。2　/min-1/kJ·mol-11Y=1.43634-11564.21900X0.993001105980.896.12Y=-4.41093-6740.08812X0.990852077.256.03Y=-4.43719-6646.34129X0.979822002.955.34Y=-5.95300-5252.35640X0.96169371.043.75Y=-7.76766-3590.46928X0.9677050.029.9·562·　　　20033　ti/℃th/℃(dw/dτ)max/%·min-1(dw/dτ)mean/%·min-1S×1011/min-2K-313907409.9743.9820.89223707307.4623.3450.60233507257.3752.9330.55843007184.7562.7590.40352807045.3282.2350.3993,,0.892×10-11min-2K-30.399×10-11min-2K-3,。1,,,52.5%。,。(4.76%)(0.94%),,NOx。,,。。,,。1,58.84%,23.70%,2.5。3,9.974%/min3.982%/min,5.328%/min2.235%/min,。,。1DTG500℃,DTG;DTG,320℃,DTG,,。,,;,DTGDTG,。图1　试样燃烧特性曲线4　　,:,,,。,,。:[1]　,.[M].:,1985.[2]　,.[J].,2001,7(1):72-76.[3]　.[D].:,1989.(辉　编辑)·563·6,:　　emergewithregardtothedefinitionoftheexergyefficiency.Insuchacaseasimilarmethodforcopingwiththedefectcanbeputintouse.Keywords:exergyefficiency,definitionmethod,analysis,mathematicalexpression,heatpump=AnInvestigationoftheMethodforEvaluatingtheExergyLossRelatingtoaShell-and-tubeSeawaterHeatExchangerFoulingCondition[,]/JIANGZhu-xing,LIUXiao-hong(GuangzhouHighTechnicalSchoolofNavigation,Guangzhou,China,PostCode:510725)//JournalofEn-gineeringforThermalEnergy&Power.-2003,18(6).-558～560Ananalysisisgivenoftheimpact,whichthefoulingofashell-and-tubeseawaterheatexchangeratthetubesideandtheresultingchangesinheattransferintensityandflowpressuredropwillhaveontheexergylossoftheheatexchanger.Amethodisproposedtoevaluateheatexchangerfoulingconditionbymakinguseoftheexergylossfactor.Thismethodhasbeenfoundtobemorecomprehensiveandstraightforwardforevaluatingheatexchangerfoulingthantheonebasedonheatresistancedetectionandmeasurement.Keywords:heatexchanger,exergyloss,fouling=AStudyoftheCharacteristicsofMixedBurningofMunicipalSewageSludgeandCoalbyaThermogravimetricMethod[,]/GULi-feng,CHENXiao-ping,ZHAOChang-sui,etal(EducationMinistryKeyLaboratoryonCleanCoalPowerGenerationandCombustionTechnologyundertheSoutheasternUniversity,Nanjing,China,PostCode:210096)//JournalofEngineeringforThermalEnergy&Power.-2003,18(6).-561～563Athermogravimetricmethodisemployedtostudysuchparametersasignitiontemperature,activationenergyandcompre-hensivecombustioncharacteristicsinconnectionwiththeburningofmunicipalsewagesludgeandcoalaswellastheirblends.Theresultofthestudyindicatethatascomparedwiththecaseofburningonlycoalthecombustionofblendshasresultedinanenhancedactivationenergywithaloweringoftheignitiontemperatureandareductionofcomprehensivecombustionperformance.Duringtheblendburningprocessthemunicipalsewagesludgeandcoalhavebasicallymain-tainedtheirrespectivedevolatilizationcharacteristicswiththecoalburningexhibitingamoreconspicuousbehaviorinthisrespect.Keywords:municipalsewagesludge,coal,mixedcombustionofsewagesludgeandcoal,thermogravimetricmethod=WasteHeatMulti-stageRecoverySystemandItOptimization[,]/LIUYe-kui,WANGLi,YANWen-jun,etal(CollegeofEnvironmentalandChemicalEngineeringundertheXi'anJiaotongUniversity,Xi'an,China,PostCode:710049)//JournalofEngineeringforThermalEnergy&Power.-2003,18(6).-564～567,576Takingintoaccountthecommonlyseenphenomenonofincompleterecoveryofwasteheatfromreactorsamulti-stagesys-temofreactionheatrecoveryisproposedbasedonasingle-stagesystemofwasteheatrecovery.Withthenetpoweroutputservingasanobjectivefunctionanoptimizationofthemulti-stagerecoverysystemwasconducted.Itcanbedemonstratedthatthemulti-stagesystemofwasteheatrecoveryismarkedlysuperiorascomparedtothesingle-stageoneintermsofheatrecoveryefficiency.Keywords:heatrecovery,wasteheat,optimization,multiplestage,model=NumericalAnalysisofaThree-dimensionalTurbulentFlowFieldinaCentrifugalImpeller[,]/TANDa-zhi,YUANXin(DepartmentofThermalEngineering,TsinghuaUniversity,Beijing,China,PostCode:100084)//JournalofEngineeringforTh