Numerical Simulation of Horizontal Diffusion Resistance of Dust Produced by Shearer Cutting Coal

Abstract

With the increase of the mining height of fully mechanized mining face, the horizontal diffusion degree of coal dust produced by shearer is obviously enhanced, forcing the amount of dust diffused to the pedestrian side of the support to increase, polluting the regional environment of operators. In order to investigate the inhibition mechanism of horizontal diffusion of coal dust produced by shearer, a three-dimensional model of coal dust produced by shearer in fully mechanized mining face was constructed based on the specific conditions of the working face. The results show that the dust collector arranged on the shearer has a certain effect on the coal cutting dust production, which can reduce the maximum dust concentration from 544 mg/m³ to 464 mg/m³, and the dust removal efficiency is 15%, but the wind speed and flow field have little effect. Compared with the fully mechanized mining face with normal ventilation, the dust baffle plate has a blocking effect on the horizontal diffusion of dust produced by the shearer cutting coal. Under the condition that it is flush with the wind side face of the shearer, the dust in the range of 10 m can be completely blocked, and the dust in the range of 20 m can be controlled to 50 mg/m³.