W火焰锅炉低氮燃烧改造策略分析

Low NO_x combustion transformation strategy for W-flame boilers

以亚临界300MW机组及超临界600MW机组为例,对W火焰锅炉进行低氮燃烧技术改造后所引起的机组运行成本的变化情况进行了分析,给出了亚临界300MW机组和超临界600MW机组W火焰锅炉低氮燃烧改造后,锅炉效率、供电煤耗的最大可承受损失以及对应的飞灰含碳量最大增量。同时,指出W火焰锅炉低氮燃烧改造前,必须合理制定NOx控制目标,并充分估计飞灰含碳量的增加等变化对锅炉效率的影响,提高脱硝改造的经济效益。

Taking the subcritical 300MW unit and supercritical 600MW unit as the examples,the running cost changes of the W-flame boilers caused by the low NOx combustion retrofitting were investigated.After the transformation,the maximum sustainable loss of boiler efficiency and coal consumption,and the maximum increment of carbon content in fly ash were given.Besides,it pointed out that before the low NOx combustion transformation,a reasonable NOx emission control target should be made,and the influence of the carbon content increment on boiler efficiency should be fully estimated to enhance the economic efficiency.