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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.
In different secondary flue gas recirculation mode, taking 300 MW oxyfuel combustion boiler unit as an example, flue gas desulfurization and wet desulfurization (FGD) and DCC were conducted in series with direct contact cooler (DCC) Desulfurization and dehydration of oxygen-rich combustion system in detail to calculate and compare the changes in the volume fraction of water vapor in flue gas, and calculate and compare the fan power consumption under various arrangements.The results show that: DCC dehydration alone, the boiler smoke The volume fraction of gas and water vapor is 10% -15% higher than that of air combustion; when the second cycle flue gas is dehydrated, the content of water vapor in boiler flue gas is about 3% higher than that of air combustion mode; when FGD and DCC are arranged in series The water vapor content of flue gas flowing through the boiler was slightly higher than that of the second cycle flue gas dehydration when using DCC alone. When the circulating water temperature was 30 ℃, the theoretical steam volume fraction of DCC was 4.28% The total power consumption of dehydrated dry flue gas circulation mode is the minimum.