ZGM中速磨煤机局部磨损问题分析及治理

Analysis and Treatment of Local Wear of ZGM Medium Speed Coal Mill

为解决ZGM中速磨煤机运行中存在的局部磨损严重的问题,通过现场试验和数值模拟相结合的方法,确定了磨煤机风环喷口风速不均是导致该问题的主要原因。提出在磨煤机一次风风室内部,风环底部加装导流片的方式,对一次风室内部的流场进行重新组织,使得风环喷口风速得到优化。磨煤机风环改造前,单个风环喷口流量与平均流量的相对误差绝对值最大值达到100%,均匀性较差,风环进行相关优化改造后,单个风环喷口流量与平均流量的相对误差绝对值最大降低至15%,磨煤机所存在的流量偏差问题得到明显改善,同时运行一定时间后,检查发现原来磨损较严重的位置几乎没有磨损,改造效果明显。

In order to solve the serious local wear problems in the operation of ZGM medium speed coal mill,through the combination of field test and numerical simulation,it is determined that the main reason for this problem is the uneven air velocity at the wind ring nozzle of the coal mill.It is suggested that the flow field inside the primary air chamber of the coal mill should be reorganized by adding a deflector at the bottom of the wind ring to optimize the air velocity at the wind ring nozzle.Before revamping the wind ring of the coal mill,the absolute value of the relative error between the flow of the single wind ring nozzle and the average flow reaches 100%,and the uniformity is poor.After the relevant optimization of the wind ring,the absolute value of the relative error between the flow of the single wind ring nozzle and the average flow is reduced to 15%,and the flow deviation of the coal mill is obviously improved.At the same time,after a certain period of operation,it was found that there was almost no wear at the original position with more serious wear,indicating that the effect of reconstruction was obvious.