某金属矿山掘进巷道局部降温模拟

Local Cooling Simulation of Excavation Roadway in a Metal Mine

针对某金属矿山井下深部独头作业面高温热害问题,以巷道实际的开拓设计建立几何模型,利用FLUENT软件模拟巷道内的温度场变化。模拟巷道采用压入式降温通风系统,通过改变模型中风筒送风风速和温度,探究通风降温参数与巷道温度的相互关系。并在现场进行试验,验证通风降温机组实际运行的效果。结果表明:送风距离一定时,如果风筒送风风速越高,则掘进巷道内环境温度越低,降温效果就越好;若采深较大且存在热涌水等放热量较大的局部热源,送风距离的增大会使风筒送入的冷风温度快速攀升;风筒选用可伸缩性材料,送风距离可调控,有利于在更低的经济成本下改善掘进面热环境。模拟和现场检测具有较好的一致性。

In view of the high temperature heat damage problem of deep single working face in a metal mines,the geometric model was established based on the actual development design of roadway,and the FLUENT software was used to simulate the temperature field change in the roadway.The simulation roadway adopts the pressure cooling ventilation system,and the relationship between ventilation cooling parameters and roadway temperature is explored by changing the wind speed and temperature of the model stroke tube.Field tests were carried out to verify the actual operation effect of the ventilation cooling unit.The results show that when the air supply distance is constant,if the air supply velocity of the air duct is higher,the ambient temperature in the tunneling roadway is lower,and the cooling effect is better.If the mining depth is large and there is a local heat source with large heat release such as hot water,the increase of air supply distance will make the cold air temperature sent by the wind cylinder rise rapidly.Scalable material is selected for the duct,and the air supply distance can be controlled,which is beneficial to improve the thermal environment of the heading face at lower economic costs.Simulation and field test have good consistency.