Basic Research on Application of Airborne Ventilation and Dust Removal in Fully Mechanized Mining Face with Large Mining Height

Abstract

Taking the fully mechanized mining face of bulianta 12511 as the research object, the distribution law of dust movement in fully mechanized mining face with 8m large mining height was numerically simulated by using CFD software. Through the simulation results of the original dust field, it is found that the dust produced by the collapsed coal seam diffuses to the rear of the shearer under the action of wind flow, the highest point of movement of high-concentration dust mass can reach 4m, and the dust concentration gradually decreases along the roadway. High concentration dust is mainly concentrated in the 10m range before and after the shearer and on the side of the bottom plate close to the coal retaining plate, with a maximum of 3500mg/m3. In order to effectively reduce the dust in the working face, prevent dust accumulation and pollute the underground working environment, this paper innovatively proposes to install an airborne dust collector in the large mining height working face to control the dust spreading to the pedestrian side at the dust source and purify the dust. By studying the influence of dust collector placement position and treatment air volume on the dust movement and distribution rule and dust removal effect of the working face, the optimal dust removal efficiency of the working face with large mining height is obtained by the dust collector placement position and treatment air volume adaptation combination, and the maximum dust removal efficiency can reach 100%.