Influence of dust extraction area on swirling air curtain dust control in fully mechanized excavation face

In order to improve the dust control efficiency of swirling air curtain in fully mechanized excavation face and reduce the pollution of high concentration dust, this paper analyzes the influence of dust extraction area on swirling air curtain dust control by combining numerical simulation with engineering measurement. The results show that with the increase of the distance between the air extraction vent and the working face, the farther the air extraction duct is from the side wall of the roadway opposite to the air compression duct, the lower the dust control ability of the working face flow field, and the higher the diffusion distance and diffusion angle of the high concentration dust. Based on the simulation results, it is determined that the optimal dust extraction area of the swirling air curtain dust control in the fully mechanized excavation face is 2 m away from the working face, and the air extraction duct is installed on the side wall of the roadway opposite to the air compression duct. Through engineering application, the validity of the numerical simulation conclusion is verified. The dust concentration at the driver of driving machine can be reduced to 24.6 mg/m3, the dust control efficiency of the air curtain reaches 91%.