配备辅助通风的高温矿井采掘区温度分布数值模拟

巷道高温是制约深部开采的一个重要因素。为了更好地发挥辅助通风设施的作用,提高短距离高温矿井的通风降温效果,采用数值模拟方法研究辅助通风设施对巷道降温效果。通过建立数值模型,设置有无辅助通风设施、不同辅助通风设施长度、不同辅助通风设施与墙壁之间的距离以及不同进气道风速等条件,分析掘进巷道的冷却情况。结果表明:无辅助通风设施的巷道仅靠增加进气道风速无法获得显著的冷却效果;在增加辅助通风设施的情况下,随着辅助通风设施长度的增加,掘进巷道的冷却效果越来越好,当辅助通风设施长度增加到一定程度后通风降温效果开始下降;增加辅助通风设施与墙壁之间的距离可显著提高通风降温效果;在辅助通风设施长度和辅助通风设施与墙壁之间距离固定的前提下,增加进气道风速可改善冷却效果,但随着风速增加,冷却效果改善越来越不明显。

Numerical Simulation of Temperature Distribution in Mining Area of High Temperature Mine with Auxiliary Ventilation

With the mining activities going deep into the ground,the temperature environment of mining is worse because of the increase of rock temperature and air self compression heat.High temperature environment has seriously affected the development of underground mining.Air ventilation alone is not enough to remove the heat produced by surrounding rock,mining equipment and blasting.In order to reduce the temperature of driving tunnel,it is necessary to redesign the ventilation mode of mine.In this paper,the numerical simulation of the effect of adding auxiliary ventilation facilities on mine ventilation cooling was carried out.Through the establishment of numerical model,the paper set up whether there are auxiliary ventilation facilities,different length of auxiliary ventilation facilities,different distance between auxiliary ventilation facilities and the wall.After optimizing the parameters of auxiliary ventilation facilities,the paper set up conditions such as different inlet wind speed to analyze the cooling condition of driving tunnel.Through the analysis of the air velocity in the driving tunnel,we can preliminarily judge whether the air flow of the air inlet is well into the vicinity of the driving face.Through the temperature distribution of the tunnel section and the average temperature change curve of the cross section of the driving tunnel,we can directly reflect the change of the temperature of the driving tunnel.The results show that in the tunnel without auxiliary ventilation facilities,the air-conditioning flow seldom enters into the driving tunnel.By increasing the air speed of the air inlet alone,the cold air flow can’t flow into the working face more,and increasing the air speed can’t obtain significant cooling effect.By adding auxiliary ventilation facilities,the air-conditioning flow under the guidance of auxiliary ventilation facilities flows into the driving face more.The effect of ventilation and cooling is obviously improved.In the case of adding auxiliary ventilation facilities,with the increase of the length of auxiliary ventilation facilities,the cooling effect of driving roadway is getting better and better at first,but when the length of auxiliary ventilation facilities increases to a certain extent,the cooling effect of ventilation begins to decline.Increasing the distance between auxiliary ventilation facilities and walls can significantly improve the cooling effect of ventilation.In the case of the length of auxiliary ventilation facilities and auxiliary ventilation facilities and walls when the distance between the walls is fixed,the cooling effect can be improved by increasing the inlet air speed,but the cooling effect is not obvious with the increase of the air speed.The research results are helpful to give full play to the role of auxiliary ventilation facilities,effectively reduce the high temperature in the driving tunnel,and have certain reference significance for the ventilation and cooling design of the mine.