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1、第31卷第12期动力工程学报Vol.31No.122011年12月JournalofChineseSocietyofPowerEngineeringDec.2011文章编号:1674-7607(2011)12-0893-06中图分类号:TK229.2文献标识码:A学科分类号:470.30富氧燃煤锅炉烟气再循环方式选择与水分平衡计算阎维平,董静兰,马凯(华北电力大学教育部电站设备状态监测与控制重点实验室,保定071003)摘要:在不同的二次烟气再循环方式下,以300MW富氧燃烧锅炉机组为例,对分别采用直接接触式冷却器(DCC)进行
2、烟气脱水和湿式脱硫(FGD)与DCC串联进行烟气脱硫及脱水的富氧燃烧系统详细计算并比较了烟气中水蒸气体积分数的变化,并计算和比较了各种布置方式下的风机功耗.结果表明:单独采用DCC脱水情况下,锅炉烟气水蒸气体积分数比空气燃烧方式下高10%~15%;二次循环烟气脱水时,锅炉烟气中的水蒸气含量比空气燃烧方式下高约3%;FGD与DCC串联布置时的锅炉流通烟气水蒸气含量略高于采用单独DCC时二次循环烟气脱水的水蒸气含量;电厂循环水温度为30时,DCC出口烟气理论水蒸气体积分数为4.28%;单独采用DCC脱水的干烟气循环方式的风机总电耗最小.关键词:富氧燃烧;烟气再循环;水蒸气体
3、积分数;DCC脱水ModeSelectionofFlueGasRecirculationandBalanceCalculationofWaterVaporContentforOxy-CoalCombustionBoilersYANWei-ping,DONGJing-lan,MAKai(MOE'sKeyLabofConditionMonitoringandControlforPowerPlantEquipment,NorthChinaElectricPowerUniversity,Baoding071003,China)Abstract:Takingthe300MWox
4、y-coalcombustionboilerasanobjectofstudy,thewatervaporcontentinfluegasandtheauxiliarypowerconsumptionwerecalculatedandcompared,atdifferentmodesofseconda-ryfluegasrecirculation,withthefluegasdehydratedbyDCCmethodordehydratedanddesulphurizedbyFGD+DCCprocess.Resultsshowthatwhenthefluegasismer
5、elydehydratedbyDCC,ifdehydrationisnotappliedinthesecondaryfluegasrecirculation,thevolumetricfractionofwatervaporinfluegasfromoxy-coalcombustionsystemwillbe10%-15%higherthanthatfromaircombustion;ifdehydrationisap-pliedinthesecondaryfluegasrecirculation,theformeronewillbe3%higherthanthelatt
6、erone.WhereasinaFGD+DCCarrangement,whenbothdesulphurizationanddehydrationareappliedinthesecondaryfluegasrecirculation,thewatervaporcontentinfluegaswillbeslightlyhigherthanthatonlyDCCisusedandnodehydrationisadoptedinthesecondaryfluegasrecirculation.Atarecirculatingwatertemperatureof30,the
7、volumetricfractionofwatervaporatDCCoutletisabout4.28%.Thetotalpowerconsump-tionoffanreachestheminimumundersingleDCCconditionatthemodeofdryfluegasrecirculation.Keywords:oxy-fuelcombustion;fluegasrecirculation;volumetricfractionofwatervapor;DCCdehydra-tion收稿日期:2011-04
