Analysis on dust prevention law of new barrier strategy in fully mechanized coal mining face

The current ventilation and dust control technology features low dust removal efficiency, making it difficult to be applied in open fully mechanized mining faces. In this study, an airflow-dust coupled transport model of the fully mechanized mining face is established. With this model, the diffusion law of dust after the use of a new "Barrier closure" method is studied, and the influence mechanism of parameters including wind baffle and porous dust baffle on dust pollution is analyzed. After adding the "Barrier closure" device, about 80 % of the fresh airflow occurs lateral displacement in advance on the windward side at 3 m away from the shearer's rear drum under the effect of the wind baffle, resulting in an airflow mechanical energy difference between coal wall space and sidewalk space. The deviation of the dust-carrying airflow is suppressed. By setting the porous dust baffle in a length of 11 m, at a porosity of 50 %, and its location at the back of the shearer, the produced clean area in the sidewalk space can reach a length of up to 30 m, the average dust concentration is reduced from 645 mg/m3 to below 68 mg/m3.