The sodium in coal is easy to volatile at high temperatures.Thus

this paper proposed a test method to observe the coal ash sintering proportion at different temperatures

by applying low-temperature ashing samples.According to the sinter ratio curve

the initial sintering temperature of the coal ash was defined and then employed to judge the high temperature fouling characteristics of the coals.Finally

the corresponding division standard of fouling characteristics of the coal ash was ascertained.Because low-temperature ashing largely retains the characteristics of the original coal ash

this method is simple and quick

and has high discriminant accuracy

which agrees well with the actual operation of the power plants.