By using fuzzy comprehensive evaluation method in the fuzzy mathematics

the ignition state of pulverized coal has been quantitatively evaluated

putting forward the index of ignition timeliness js=b2/(b1+b2+b3)×100%

the greater its value may become

the better ignition situation is.Test carried on boiler in one power plant shows that the index of ignition timeliness is 19.7% to 68.0% before adjustment optimization in operation

the carbon content in fly ash being 5.5%%;After adjustment optimiation in operation

the index of ignition timeliness has largely increased

reaching 89.6%-92.2%

the carbon content in fly ash has decreased to 4.5%.Application shows that the fuzzy comprehensive evaluation method can accurately reflect the ignition situation of pulverized coal

providing a guide for combustion adjustment of boilers.