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.