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为了有效地控制综掘面高浓度粉尘污染,应用FLUENT软件数值模拟通风条件影响综掘面控尘气幕形成与作用的规律.结果表明:压风口与迎头距离、压抽比、压风筒及抽风筒直径越大,抽风口与迎头距离、压风量越小,越利于形成控尘气幕,但压抽比越小,控尘气幕的风速越大;根据数值模拟结果,拟合了50mg/m3以上高浓度粉尘扩散距离与各通风条件的关系式,确定了压抽比为0.75时,控尘气幕作用效果较佳,为控尘气幕形成与作用的最优通风条件,并将其进行了工程应用.实测值与数值模拟值基本一致,高浓度粉尘被控制在距迎头5m的无人作业区域内.
In order to effectively control the high concentration of dust in the fully mechanized mining face, the numerical simulation of the ventilation conditions with FLUENT software has the effect on the formation and function of the dust screen. The larger the diameter of the exhaust duct, the distance between the exhaust opening and the head, the smaller the amount of air pressure, the more conducive to the formation of dust control air curtain. However, the smaller the pressure-pumping ratio, the larger the wind speed of the dust-control curtain. According to the numerical simulation results, / m3 above the concentration of dust diffusion distance and the relationship between the ventilation conditions to determine the pressure ratio of 0.75, the control effect of the air curtain is better for the formation of dust curtain and the role of the optimal ventilation conditions, and It has been applied in engineering.The measured values are basically consistent with the numerical simulation values, and the high-concentration dust is controlled within the unmanned working area of 5m from the head.