Abstract: The dry ash removal technology and situation of fly ash comprehensive utilization at home and abroad were studied. Combining with the practice of Mudanjiang Second Power Plant of Huadian Energy Corporation Limited, the pneumatic ash conveying plan of electric precipitator in boiler No.7 was researched. The fly ash comprehensive utilization and its economic benefit were analyzed. And some problems that should be paid attention to in the pneumatic ash conveying system were pointed out.

Key words: pneumatic ash conveying, fly ash comprehensive utilization, selection of plan