Effect of Ca and Mg added amount on ultrafine pulverized coal combustion was studied on a thermo-gravimetric meter.It was found that demineralization obviously reduced ignition temperature

raised burnout rate

decreased activation energy and improved ultrafine pulverized coal combustion characteristics.When the amount of CaO and MgO added was low

it had little effect on the combustion characteristics.When CaO and MgO concentration reached a certain value

CaO had an inhibition effect against the coal ignition

while MgO promoted the ignition of demineralized coal and raw coal

but restrained the combustion of fixed carbon.It was also found that the maximum weight loss rate and the maximum weight loss temperature decreased observably as the content of MgO was increased to 20%.And the burnout rate was only 73.33% of the raw coal.