Numerical Simulation of Dust Migration and Deposition in Fully Mechanized Working Face with Double Air Duct

Abstract

Fully mechanized face is one of the main dust production points in mines. Air duct ventilation is an important measure to reduce dust damage. In order to grasp the dust distribution of the fully mechanized excavation surface under the condition of the indented double air duct, this paper comprehensively uses the field measurement and numerical simulation method to study the migration and deposition law of the fine dust. Firstly, the dispersion of flour dust and the concentration along the road in a mine in Shanxi were measured. Secondly, considering the influence of the comprehensive excavation machine and coal conveyor belt, the high simulation degree collection model of the double-drum comprehensive face was established and solved by FLUENT. Finally, the amount of air distribution in the front and rear air ducts was changed, and the distribution of dust particles, wall sedimentation fraction and dust concentration on the side wall of the sidewalk were obtained under three different conditions. The results show that the number of dust particles along the path decreases with the distance from the head-on distance; the air distribution has a great influence on the migration and deposition of dust, and the dust deposition basically conforms to the bottom wall, the side wall of the pedestrian side, the coal wall of the wind tube, and the roof. The law of decreasing the number of winds is constant. With the same amount of air supply, and the same air distribution of before and after air duct,the concentration of dust along the heading face is relatively low. Auxiliary dust removal facilities should be arranged away from $5 \sim 20\mathrm{m}$ of the heading face.