Research on air flow and dust distribution law of heading face under different ventilation modes and air pressures

Abstract

In order to determine the influence of different ventilation methods and pressure air volume on the dust distribution law of the heading face, a 1∶1 physical model of the heading face in the west area of Wudong Coal Mine was established. Numerical simulation was carried out on the dust migration of the heading face, and then the pressure air volume was changed under the mixed ventilation condition to observe the law of dust diffusion. The results show that the pressure-entry ventilation cannot effectively control the dust migration, but the dust can be effectively controlled under the mixed ventilation. At the same time, different pressure air volume will produce different dust control effects. When the pressure air volume is 150-250 m3/min, the pressure air volume is too small, causing dust to accumulate in the front of the roadway; however, when the pressure air volume is above 350 m3/min, dust will be carried by wind and spread to the back of the roadway before being purified by the dust removal fan, which makes the dust control effect poor; when the pressure air volume is 300 m3/min, the dust control effect is the best, and the high-concentration dust is controlled in the roadway within 25 m from the head.

Keywords

• heading face
• mixed ventilation
• ventilation optimization
• compressed air volume
• dust control