Abstract: In Huadian Qingdao Power Generation Company Limited, aiming at the characteristics of different kinds of coal, the asfired coal blending method was adopted to improve the economic efficiency of the unit. The influence of inferior coal component on boiler combustion was analyzed. Starting from the angle of reducing the fly ash content of combustion of inferior coal with low volatile content and low calorific value, the feasibility to reduce the fly ash content of inferior coal combustion in unit was discussed in depth. The measures to reduce the ash content were adopted, and better effect was obtained.

Key words: pulverized coal system, inferior coal, fly ash content, combustion adjustment, fuel coal blending