An analysis of ash deposition phenomenon in electrostatic precipitator(EP) in Mine Mouth Power Plant under Pingdingshan Coal Group has been carried out. It is believed that the main causes are as follows: the layout of origially designed ash clearing rapping system is improper; firing low-grade coal with high ash content and high water content; air leakage into the EP proper; etc.

affecting the effectiveness of rapping for ash-clearing. After additionally installing soot-blower with varying audio frequency

the effectiveness of ash clearing in EP has been obviouly enhanced

the troubles due to ash deposition being greatly reduced

the flue gas draft loss being also somewhat decreased

improving the efficiency of EP.