Study on the modularized airflow-diverging system and dust-control technology in the fully mechanized heading face

Abstract

Aiming at the serious dust pollution caused by the cutting operation in coal mine fully mechanized heading face, a modularized airflow-diverging system and dust-control technology were put forward. A coupling model of airflow and dust was established by the Euler-Lagrange method, and the influence law of airflow diverging from different side outlets, inclination angle α, included angle β and radial-to-axial airflow volume ratio γ on the coupling diffusion of airflow and dust was simulated and studied. The results show that compared with β = 0°, the dust-control ability is improved at β = 8°; when β = 8°, the dust diffusion distance df shows a trend of “increasing first and then decreasing” with the increase of upward inclination angle, “decreasing first and then increasing” with the increase of downward inclination angle and “decreasing first and then increasing” with the decrease of γ, respectively. The optimal parameters are two side outlets for airflow diverging, α = +20°, β = 8° and γ = 8:2. Under the optimal parameter scheme, the velocity of spiral wind Vs changes with its migration distance ds showing the law of “decreasing first, then increasing and then second attenuating”, the df on the breathing belt is less than 8 m, and the concentration of dust at the driver decreases by 99.4% compared with the existing technology. The results of similar experiments further show that this system can effectively prevent the diffusion of dust and provide a new technology for the clean production of coal mine energy