Fan mill direct-fired pulverizing system distribution characteristics

ZHANG Feng; LI Wen; JIA Bo; JIN Zhonghua

doi:10.13226/j.issn.1006-6772.2017.01.013

Abstract：In order to solve the blockage problem in the fourth layer pulverized coal pipe of a fan mill direct-fired pulverizing system in a certain power plant in Inner Mongolia,the distribution characteristics of the coal pulverizing system was studied.By experimental measurements,it was found that the distribution unevenness in distributor entrance was the root cause of the blockage problem in the fourth layer pulverized coal pipe,and the adjustment effect of the uneven problem was small.Test model for further study found that,the swirl distributor or grille type distributor could effectively solve the problem of the fourth layer pulverized coal blockage,and the resistance was smaller than the current operation mode that the fourth layer pulverized coal pipe was plugged.Implement of any solution wouldn't make the system ventilation lower than the current running air volume,so the transformation met the coal pulverizing system output requirements.If the swirl distributor was used,the powder quantity in the first layer pulverized coal pipe was less about 40％,and the resistance was more about 250 Pa than one level grille distributor.So grille distributor was preferred for the reformation to solve the blockage problem in the fourth layer pulverized coal pipe.