矿井通风系统风流流动数值模拟研究

Numerical Simulation of Air flow in Mine Ventilation System

以山西煤炭进出口集团韩家洼煤矿为例,分析其工程概况,对通风系统可靠性进行评价,通过理论分析、数值模拟的研究方法对矿井通风系统风流流动、风速、风量及负压进行模拟。研究表明:正常情况下,在总回风巷中,巷道的风速最大,在长度较小的联络巷风速较小,有毒有害气体量小,无瓦斯突出的危险,风量除了与风速大小有关,还与巷道的端面大小有关,其与风速无明显的函数关系;调节风门异常时,巷道风速增加量大,通风系统中的其他巷道受此影响风速也有所增加;风压异常时,风机负压减小量与风速大小、风量大小关系成函数对应关系。工程实测表明,数值模拟各巷道风量和风速研究结果与矿上实测结果相符,数值模拟可对通风系统进行评价。

Taking the Hanjiawa Coal Mine as an example, this paper analyzes its engineering general situation and evaluates the reliability of the ventilation system. Through the theoretical analysis, the numerical simulation method is used to simulate the flow of the ventilation system in the mine ventilation system, the wind speed, the air volume and the negative pressure. The study shows that the wind in the general return air lane is normal under the normal conditions. The speed is maximum, the wind speed is smaller in the smaller contact lane, the amount of poisonous and harmful gas is small and the gas outburst is not dangerous. The wind volume is related to the size of the wind speed,but also with the face size of the tunnel. It has no obvious function relation to the wind speed, and the wind speed increases greatly and the ventilation system is in the ventilation system when the valve is abnormal. When the wind pressure is abnormal, the decrease of the negative pressure of the fan and the size of the wind speed and the size of the air volume are corresponding to the function. The experimental results show that the numerical simulation results of wind volume and wind speed of each roadway are consistent with the measured results of mine, and the numerical simulation can be used to evaluate the ventilation system.