Effects of radial air flow quantity and location of an air curtain generator on dust pollution control at fully mechanized working face

摘要

To better understand the effects of radial air flow quantity and the location of air curtain generator on dust pollution control, the 2-109(2) fully mechanized working face in Xinzhi coal mine (Huozhou Coal Electricity Group Co., Ltd., Shanxi, China) was numerically simulated in the present study. A full-scale physical model of the working face was established; then, based on airflow-dust particle two-phase flowing characteristics, the k-epsilon-Theta-k(p) mathematical model was constructed. The comparison between simulation results and field measurements validated the model and the parameter settings. Furthermore, the effects of ventilation parameters on airflow migration and dust diffusion were numerically investigated using FLUENT. The results show that the increase of the radial air flow quantity (denoted as phi) and the distance of the air curtain generator from working face (denoted as d(w)) is beneficial to the formation of a dust-control air curtain. At a constant d(w), the dust diffusion distance (denoted as D) decreases with the increase of phi. At a constant phi, D decreases with the increase of d(w) when a dust-control air curtain is formed; otherwise, the increase of d(w) leads to the increase of D. By analyzing the simulation results, the optimal ventilation parameters for 2-109(2) fully mechanized working face and those working faces under similar production conditions are determined as: phi = 240-270 m(3)/min and d(w) = 20-30 m. (C) 2017 The Society of Powder Technology Japan. Published by Elsevier B.V. and The Society of Powder Technology Japan. All rights reserved.