CAJ | 학술논문

在不同的二次烟气再循环方式下,以300 MW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.
재불동적이차연기재순배방식하,이300 MW부양연소과로궤조위례,대분별채용직접접촉식냉각기（DCC）진행연기탈수화습식탈류（FGD）여DCC천련진행연기탈류급탈수적부양연소계통상세계산병비교료연기중수증기체적분수적변화,병계산화비교료각충포치방식하적풍궤공모.결과표명：단독채용DCC탈수정황하,과로연기수증기체적분수비공기연소방식하고10%-15%;이차순배연기탈수시,과로연기중적수증기함량비공기연소방식하고약3%;FGD여DCC천련포치시적과로류통연기수증기함량략고우채용단독DCC시이차순배연기탈수적수증기함량;전엄순배수온도위30℃시,DCC출구연기이론수증기체적분수위4.28%;단독채용DCC탈수적간연기순배방식적풍궤총전모최소.
Taking the 300 MW oxy-coal combustion boiler as an object of study,the water vapor content in flue gas and the auxiliary power consumption were calculated and compared,at different modes of secondary flue gas recirculation,with the flue gas dehydrated by DCC method or dehydrated and desulphurized by FGD＋DCC process.Results show that when the flue gas is merely dehydrated by DCC,if dehydration is not applied in the secondary flue gas recirculation,the volumetric fraction of water vapor in flue gas from oxy-coal combustion system will be 10%-15% higher than that from air combustion;if dehydration is applied in the secondary flue gas recirculation,the former one will be 3% higher than the latter one.Whereas in a FGD＋DCC arrangement,when both desulphurization and dehydration are applied in the secondary flue gas recirculation,the water vapor content in flue gas will be slightly higher than that only DCC is used and no dehydration is adopted in the secondary flue gas recirculation.At a recirculating water temperature of 30 ℃,the volumetric fraction of water vapor at DCC outlet is about 4.28%.The total power consumption of fan reaches the minimum under single DCC condition at the mode of dry flue gas recirculation.