Numerical Simulation Of Ventilation And Cooling In The Mine Shaft Of High Geothermal Metal Mine

With the increasing of the depth of the mine, the mine heat harm is to be solved. High ground temperature is the main factor of deep mine thermal pollution formation. The research of the temperature variation of the air temperature in the roadway in the ventilation process is discussed through the numerical simulation method, based on the research object of the ventilation cooling process of the Nihe iron ore.Taking Nihe mine-750 m level tunnel as an example, by using the FLUENT numerical simulation, which model of ventilation is built to simulate different conditions from the horsehead door into the roadway to stope temperature changes in the process of stroke. According to the law we can optimize the ventilation cooling system, and it reduces the secondary cooling time, energy consumption and economic cost on the premise of guarantee the normal work of the workers.Under different wind speeds, endogenous wind temperature changes when the wind which is from the horsehead door enters stope tunnel. The simulation results show that the wind speed increases at a rate of about 0.5 m/s, as the wind speed increases, the inlet air temperature and the cooling rate is reduced after wind arrived at stope through roadway. The best wind speed which go through recent roadway and farthest roadway were 3.5 m/s and 4 m/s.With different inlet air temperature conditions, the simulation results show that the temperature in when the temperature of the tunnel entrance is increased, the temperature increases with the increase of the temperature of the entrance, the temperature in stope and inlet air temperature is a relationship of linear.According to the local air temperature change rule, the blast temperature of the stope conforms to the requirements of the professional practices and it is known that it needs auxiliary cooling in the mining stope from May to September, mining stope, as far as need auxiliary cooling from May to October. The auxiliary cooling time reduces with the increasing of wind speed, but the wind speed is too large, energy consumption will also increase.The cooling effect of the tunnel and the thermal insulation material is simulated, and the results show that the roadway and the thermal insulation layer can obviously improve the cooling effect of the ventilation. Under the same wind speed and inlet air temperature conditions, it can make the stope wind temperature reduce 0.872~10.814 ? and reduce auxiliary cooling time 2 months. Daily temperature conditions and auxiliary cooling time can provide the basis for the work schedule and reduce the cost.