关键词: 掘进工作面, 双风幕, 除尘率, 数值模拟

Abstract: Aiming at the problem of excessive dust concentration in fully mechanized excavation face, taking the fully mechanized excavation face of Sima Coal Mine in Changzhi, Shanxi Province as the research object, a simulation model of double air curtain ventilation system formed by parallel outlets was established. The standard k-ε turbulence model was used in the air phase, and the DPM model was used in the particle phase to simulate the air flow field and dust field near the fully mechanized excavation face. The research shows that the double air curtain ventilation system generates two independent air curtains in front of the driver under the Conda effect of the air outlet guide plate, and the first air curtain near the dust production point blocks most of the dust generated during the operation in the main control dust area. The second air curtain is located between the first air curtain and the driver to form an auxiliary control dust area to further intercept dust; when the angle α of the upper and lower deflectors is 45 °, the height H of the air outlet is 30 mm, and the distance L of the air outlet from the fully mechanized excavation face is 10 m, the dust concentration in the breathing zone is the smallest. Comparing the dust control and dust removal performance of the double air curtain ventilation system with the traditional long pressure short pumping ventilation system, it can be seen that the dust concentration in the breathing zone is much lower than that of the latter, and the dust removal rate is increased by 84 %. The research results prove that the double air curtain ventilation system can effectively reduce the problem of dust diffusion from the heading face to the roadway, and provide a new ventilation method for dust removal in the fully mechanized heading face．