Numerical simulation and field test of dust control effect of exhaust ventilation in fully mechanized face

Abstract

Abstract In view of the ventilation status of xiaobaodang coal mine fully mechanized driving face, this paper puts forward the idea of using full extraction ventilation to solve the problem of pollution air leakage in long pressure short suction ventilation, which provides a new idea for dust control of fully mechanized excavation in xiaobaodang coal mine. Solid geometry model of fully mechanized driving face is established by SolidWorks. The influence of different distance between suction outlet and head-on and different air volume on dust migration distribution and dust control effect is analyzed by fluent. The results show that the best dust control effect is obtained when the air volume is set at 300m3 / min and the distance between the suction outlet and the head-on is 5m. The dust concentration is lower than 10mg / m3 in the air duct side, 8m in the central section of the air duct and 16m in the height of the respiratory zone on the pedestrian side. The dust control effect is better at the side far away from the air duct. The measured results are consistent with the numerical simulation results. In addition, the optimized dust control method was verified on site, and the dust reduction efficiency at the driver's place and personnel walking position reached 62.8% and 82.8% respectively.