CFB锅炉飞灰含碳量影响因素分析

Influence factors of carbon content in fly ash in circulating fluidized bed boiler

针对某电厂300 MW双支腿循环流化床（CFB）锅炉,基于影响因子系数分析方法,研究不同负荷下及负荷变化时入炉煤颗粒粒径、二次风出口压力与密相区压降比（p1/Δp）、省煤器出口氧量、一二次风量比和床温对飞灰含碳量的影响。结果表明：二次风出口压力与密相区压降比和一二次风量比对飞灰含碳量的影响程度较大,而省煤器出口氧量和床温（880~930℃）的影响相对较小。该研究结果可为双支腿CFB锅炉的燃烧调整提供指导。

Taking a 300 MW unit circulating fluidized bed（CFB）boiler as an example,the influencing factor coefficient analysis method was employed to investigate the effects of several operation parameters on carbon content of fly ash under conditions with different loads and variable load,such as the coal particle size,the pressure ratio of the secondary air outlet pressure to pressure drop in dense phase zone,the oxygen content at the economizer outlet,the ratio of the primary air volume to the secondary air volume,and the bed temperature.The results show that,the ratio of the secondary air outlet pressure to pressure drop in dense phase zone,and the ratio of the primary air volume to the secondary air volume,have greater influence on the carbon content of the fly ash.While the oxygen content at the economizer outlet and the bed temperature（880~930℃）have relatively lower one.The results of this study provide guidance for the adjustment of combustion underpants leg type circulating fluidized bed boiler.