局部负压作用下综采工作面各粒度粉尘弥散机制分析

Analysis of Dust Dispersion Mechanism of Each Particle Size in Fully Mechanized Mining Face under Local Negative Pressure

摘要: 针对综采面粉尘污染问题，文章在局部负压作用下对于综采工作面各粒度粉尘的弥散机制进行了分析。通过建立风流–粉尘双向耦合模型，分析了综采面风流场运移规律和不同粒径下粉尘弥散机制，并对比分析了人行道侧与煤壁侧沿程粉尘浓度。结果显示，通过设置的隔尘板和吸风口，煤壁一侧区域风速明显低于人行道一侧，大量粉尘在局部负压的作用下，被吸风口抽出，粉尘弥散受到限制，人行道部分区域粉尘浓度仅为15.0 mg/m³，人行道侧各粒径粉尘浓度均小于煤壁侧。随着弥散距离的增加，部分携尘风流侵入人行道内，人行道侧粉尘浓度逐渐增大，但大粒径粉尘的浓度沿巷道距离的增加呈下降状态。

Abstract: Aiming at the problem of dust pollution in a fully mechanized mining face, this paper analyzes the dispersion mechanism of dust of each particle size in a fully mechanized mining face under the action of local negative pressure. Through the establishment of a two-way coupling model of airflow and dust, the movement law of the airflow field in a fully mechanized mining face and the mechanism of dust dispersion under different particle sizes are analyzed, and the dust concentration along the sidewalk and coal wall is compared and analyzed. The results show that the wind speed on one side of the coal wall is obviously lower than that on the other side of the sidewalk through the dust barrier and suction outlet, and a large amount of dust is drawn out by the suction port under the action of local negative pressure, and the dust dispersion is limited. The dust concentration in some areas of the sidewalk is only 15.0 mg/m³, and the dust concentration of each particle size on the sidewalk side is lower than that on the sidewalk side. With the increase of the dispersion distance, part of the dust-carrying airflow invades the sidewalk, and the dust concentration on the sidewalk side increases gradually, but the concentration of large particle size dust decreases with the increase of roadway distance.