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1、华北电力大学硕士学位论文AbstractCoalresourcesisrichinourcountry,whereligniteresourcesisrelativelyabundant,theprovenreservesofligniteaccountsforabout17%ofnationalcoalreserves.Withtherapiddevelopmentofeconomic,thehigh-qualitycoalincludingbituminouscoal,anthracite.etchavebeenfullyutilized,solignit
2、ehasbecomeamajorpartinourcountryenergyproductionandsupply.Ligniteisalowgradefuelofhighvolatile,highmoisture,lowcalorificvalue,lowashmeltingpoint,resultingthatit'snotconducivetotransportation,storage,lowefficiencyofdirectcombustion,greenhousegasemissionslargeandsoon.Sohowtoefficient,
3、economy,comprehensiveutilizationofligniteandmakefulluseoflignitepowergenerationisurgentlyneededtosolveproblemsandimprove.Thispaperdescribestheresearchbackground,significanceandresearchstatus,utilizationanalysistheoreticalanalysisandnumericalcombiningsimulationmethodofthelignitedryin
4、gandblending,ligniteelementalanalysis,TGAexperimentsandisothermaldryingexperimentanalysis,studyadryheatoflignite.Studylignitedryingtechnology,establishlignitedryingprocessmodel,andcalculatedandanalyzedthemodeldryersandprojectexamplesofregenerativeextractionsteamdryinglignite.Takingo
5、neplant600MWsupercriticalcoal-firedboilerastheresearchobject,takethenumericalsimulationforblendedlignitecombustionprocess,andblendedlignitewerethermodynamiccalculationinthepartitionperiodoffurnace.Resultsshowthatthelignitecoalsamplemoistureprecipitationoccurredmainlyunder180℃,15minu
6、tesbefore;thehigherthedryingtemperature,thehigherthedegreeoflignitedrying,thefasterthedryingrate.Usethesuperheatedsteamdryinglignite,thehighersteamtemperature,thelowerthesteamconsumptionnecessaryforlignitedrying;thehigherthelignitemoisturecontent,thelowersteamconsumptionnecessaryfor
7、lignitedrying.Whentheligniteblendingshareincreased,thefurnacetemperaturedropped,COconcentratiooftheburnerareaelevated,CO2concentrationinthehearthrised;afterthelignitedrying,furnacetemperatureincreased,theCOconcentrationintheburnerareadecreased,theCO2concentrationinthehearthdropped.F
8、luegastemperaturean
