LIU Dandan¹, ZHU Hongfei¹, LI Dewen²

(1.School of Electrical & Control Engineering, Heilongjiang University of Science & Technology, Harbin 150022,China;2.China Coal Technology Engineering Group Chongqing Research Institute,Chongqing 400037,China)

Abstract：In order to improve the separation standard deviation of the respiratory dust sampling separator under the existing virtual impact technology, the wall effect in the wall jet was adopted, and the influence of the changed model angle on the particle capture efficiency was combined.On the basis of the separation cavity of the convex inner wall, the angle of the accelerated nozzle tail, the angle of the vertex of the outer wall, and the distance from nozzle to collect cavity were studied on the effect of model separation.Through the gas-solid two-phase flow mode of the finite element software ANSYS Fluent, the flow field inside the separator was simulated.The particles were captured and tracked during the simulation, and the resulting separation efficiency was compared to the standard of the BMRC curve.The results show that compared with the separator model with convex inner wall structure, the separation efficiency of the improved respiratory dust sampling separator at the smaller particle size is closed to the BMRC curve, the separation deviation is limited to less than 1.6%, and the separation standard deviation is proved to be 12.83% higher than that of the reference model, reaching δ₂=2.31%.

Keywords：virtual impact technology;wall jets; gas-solid two phase flow; numerical simulation curve; respiratory dust

Received:：2022-08-31，Revised：2022-10-17,Online：2023-01-04 10:50。

Funding Project：国家重点研发计划项目，编号：2017YFC0805208。

First Author：刘丹丹(1978—)，女，教授，博士，硕士生导师，研究方向为矿山安全监测与电气设备控制。E-mail：liudandan2003@163.com。

Corresponding Author：朱鸿飞(1998—)，男，硕士研究生，研究方向为电气设备状态监测与矿山安全监控。E-mail：1216358329@qq.com。