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1、华北电力大学硕士学位论文AbstractOxy-fuelcombustiontechnologyisanewgenerationofcleancoalpowergenerationtechnology,whichfluegasrecirculationsystemincludingdry,wettwotypes.Themaindifferenceiswhetherthepartfluegasoftheboilerexhaustafterdryingprocessisthenfedintothefurnacethroughtherecirculationsystem,twotypesofflu
2、egascirculationeachhaveadvantagesanddisadvantages.Basedonoxy-fuelcombustionboiler,thispaperattemptstoresearchtheeffectsofdry/wetfluegasrecirculationmodeonthermodynamiccharacteristicsandsafty,whichisimportantforitslaterpracticalengineeringpurposes.Takea600MWpulverizedcoalboilerasanexample,thethermal
3、analysisofcoalunderdry/wetcycleofoxy-fuelmodesweredone,andtheresultswerecomparedwiththatunderaircombustion.Basedonenergybalance,theboilerwasredesigned.Theemissivitiesfortri-atomgaseshavealreadybeencalculatedbytheimprovedmodelofgasmixturesoverlappingbandandthebenchmarkmodelsunderdry/wetcycleofoxy-fu
4、elmodes.Basedonfluegascomponents,effectofrecirculationmodeonaciddewpointoffluegaswasdiscussedforthefirsttime.Againstexistingproblemofcoalmilllow-temperaturecorrosionintheconventionalboiler,thepapertriedtostudythecorrosioncharacteristicsofcoalmillatoxy-fuelcombustionmode.Fluegascomponentsaresensitiv
5、etodesulfurizationanddehydrationatrecirculationmodesunderoxy-fuelcombustion.Comparedwithdrycyclemode,theresultofhigherboilerefficiencyandlesscoalconsumptionarecausedunderwetcyclemode.Theoptimizedtotalheatedareaisreduced,thiscansavepartinitialinvestment.TheimprovedmodelisingoodagreementwithLBLmodel,
6、WSGGmodel,maximumdeviationisonly10.0%,17.4%.Theemissivitiesunderwetcyclemodearehigherthanunderdrycyclemode.Thedewpointoffluegasatoxy-fuelatmosphereismuchhigherthanthatatairatmosphere.Whenusingwetcyclemode,thetailoftheboilermaycausecorrosionproblems.Atthesametime,whenburningusingwetcyclemodeorhighsu
7、lphurcoal,themillwillcauseseriouscorrosionproblem.Inaddition,thechangesofboilerloadeffectlittleonthecharacteristicsofcoalmilllow-temperatureII华北电力大学硕士学位论文corrosion.Keyword：oxy-fuelcombustion；dry/wetfluegasr
