制粉系统是火电厂煤粉锅炉系统中至关重要的组成部分,磨煤机运行是否良好将对机组的正常运行产生直接影响。某电厂ZGM133G-Ⅰ型中速磨煤机在投运过程中存在外筒体磨损严重,煤粉泄露的风险隐患。为解决中速磨煤机存在的筒体局部磨损严重的问题,采用数值模拟的研究方法对磨煤机内部流场进行计算分析,找出筒体局部磨损严重的原因后提出在磨煤机入口安装导流板的流场优化方案,并进行现场实际改造。研究结果表明：动环阻力不同是动环出口风速不均的主要原因。一次风室入口安装导流板后动环出口风速得到明显优化,现场改造运行一段时间后发现,筒体磨损区域有所分散,局部偏磨趋势有所减轻,优化效果明显。该研究可为磨煤机筒体防磨治理提供参考。

The pulverizing system is a crucial part of the pulverized coal boiler system in thermal power plants, and whether the coal mill runs well or not will have a direct impact on the normal operation of the unit. In a power plant, ZGM133G-I medium-speed coal mill has the risk of serious wear of outer cylinder and coal dust leakage during operation. In order to solve the problem of serious local wear of the cylinder existing in the medium-speed coal mill, numerical simulation research method is used to calculate and analyze the internal flow field of the coal mill, to find out the reasons for the serious local wear of the cylinder, and after that the flow field optimization scheme of installing a guide plate at the inlet of the mill is proposed, and the actual on-site modification is carried out. The results of the study show that the different resistance of the dynamic ring is the main reason for the uneven wind speed at the outlet of the dynamic ring. After the installation of the deflector plate at the entrance of the primary air chamber, the wind speed at the outlet of the dynamic ring is obviously optimized. After the field modification and operation for a period of time, it was found that the wear area of the cylinder was dispersed, and the trend of local partial grinding was reduced, so the optimization effect was obvious. This study can provide reference for the anti-wear management of coal mill cylinder.

TM621.2

陕西省重点研发计划项目（2022GY-156）