不同烟气再循环方式下富氧燃煤锅炉的经济性分析

摘要

以300MW富氧燃煤锅炉为例,详细计算并比较了不同烟气再循环方式下锅炉的排烟损失及辅机的功耗,分析了不同配置的烟气再循环方式对富氧燃煤锅炉系统经济性的影响.结果表明：FGD与DCC串联布置的湿烟气循环方式（二次循环烟气不脱硫也不脱水）锅炉的排烟损失最低（5.6%）,辅机的功耗最高（14MW）;单独DCC布置干烟气循环方式锅炉的排烟损失最高（7.56%）,辅机的功耗最低（13.23MW）.%Taking a 300 MW oxygen-enriched coal-fired boiler as an object of study,flue gas loss and auxiliary power consumption of the boiler were calculated and compared at different modes of flue gas recirculation,while influence of flue gas recirculation mode on economy of the boiler analyzed.Results show that in the series arrangement of FGD ＋ DCC and at the wet flue gas recirculation mode（no dehydration or desulfurization applied in the second flue gas recirculation）,the flue gas loss is the lowest（5.6%） and the auxiliary power consumption is the highest（14 MW）;whereas in the arrangement of only DCC and at the dry flue gas recirculation mode,the flue gas loss is the highest（7.56%） and the auxiliary power consumption is the least（13.23 MW）.