由于磨煤机运行过程中存在的风粉分布不均，局部磨损严重问题，本文采用CFD数值模拟的方式，在同一工况下，仅改变动环内叶片形状，进行模拟试验，研究风环折角叶片中竖直侧长度对流场均匀性及风环进出口压差的影响。结果表明，风环内部叶片形状采用45°和垂直叶片链接组合的方式，垂直叶片占比变化对风环出口的均流作用影响较小，但会使一次风入口与风环出口间的平均压差（下简称进出口压差）随着增大而大幅减小；随着风环外部导流叶片长度增加，均流效果先提升后下降，进出口压差小幅增加。上述两种改变方式综合利用，可以在风环内均流效果提升的同时调整进出口压差，以达到不影响磨煤机正常运行的同时调整优化风环出口流场的目的。

Owing to the uneven distribution of air and pulverized coal and the severe local wear problems existing in the operation process of the coal mill, in this paper, by means of CFD numerical simulation, under the same working conditions, only the shape of the inner blades of the moving ring was changed to conduct the simulation test, and the influence of the vertical side length of the folded-angle blades of the air ring on the uniformity of the flow field and the pressure difference between the inlet and outlet of the air ring was investigated. The results indicate that for the blade shape inside the wind ring, when a combination of 45° and vertical blades is employed, the variation in the proportion of vertical blades has a minor impact on the flow equalization effect at the outlet of the wind ring, but it causes the average pressure difference between the primary air inlet and the outlet of the wind ring (hereinafter referred to as the inlet and outlet pressure difference) to decrease significantly as it increases. As the length of the external guide vanes of the wind ring increases, the flow equalization effect first improves and then declines, while the inlet and outlet pressure difference increases slightly. The comprehensive utilization of the above two modification methods can enhance the flow equalization effect inside the wind ring and adjust the inlet and outlet pressure difference simultaneously, achieving the purpose of adjusting and optimizing the flow field at the outlet of the wind ring without affecting the normal operation of the coal mill.

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