Abstract: In order to improve the dust control effect in the support drilling operation of the anchor drilling rig,based on
the pneumatic conveying and jet pump technology,a new type of external control dust removal device integrating the functions
of diversion dust control,spray negative pressure collaborative dust removal and efficient filtration was developed. On the basis
of optimizing the structural design,the dust collection efficiency of the device is further improved,and the multi-dimensional
improvement of dust removal performance is realized by combining spray and negative pressure dynamic collaborative dust removal
technology. The gas-solid two-phase flow in the device was numerically simulated by CFD-DPM method,and the influence
of inlet duct angle,wind speed and particle size on dust control efficiency was systematically studied. The simulation results
show that the initial wind speed at the inlet end of the dust control hood is linearly positively correlated with the wind
speed at the outlet section. When the inlet pipe angle is 45°,the conversion rate is about 40%. Larger diameter particles are
easy to deposit at the corner of the pipe. Increasing the inlet pipe angle can effectively reduce the deposited particles. The test
results show that the dust control rate of the device is not less than 85. 97% at the dust concentration of 200~ 600 mg/ m3.
Compared with the same type of dust removal device,the volume is reduced by 30%,and the dust removal effect is improved by
10%-12%,which has high engineering application value.

Key words: anchor hole,controlled and removal device of dust,dust control efficiency,numerical simulation