风扇磨煤机直吹式制粉系统风粉分配特性

为解决内蒙古某发电厂风扇磨煤机直吹式制粉系统第4层煤粉管道堵塞的问题,对该制粉系统的分配状况进行试验研究。通过试验测量发现造成第4层煤粉管道堵塞的根本原因是分配器入口风粉分配不均匀,且分配器对此不均匀问题的调节改善作用较小。试验台模型研究发现,采用旋流式分配器或格栅型分配器均可有效地解决第4层煤粉管道堵塞的问题,且均比封堵第4层煤粉管道的当前运行方式阻力要小。实施任一方案都不会使系统通风量低于当前运行风量,均能够保证制粉系统出力要求。若采用旋流式分配器,则第1层煤粉管粉量偏少约40%,且比一级格栅分配器阻力偏大约250 Pa。因此建议优先考虑改造格栅分配器以解决该制粉系统第4层煤粉管道堵塞的问题。

Fan mill direct-fired pulverizing system distribution characteristics

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.