Numerical simulation research on deep mine work face heat hazards control and cooling system optimizing

Heat hazards in China's typical coal mines become more and more serious with the increase of mining depth.Recently,the high-temperature exchange machinary system(HEMS) by using coal mine inflow is employed in Xuzhou Mining Group deep coal mines.Field experiments show that this cooling system achieves obvious effect in heat hazard control,but the researches on mechanism and the optimizing of HEMS system are still needed.Based on the field experiment in Zhangshuanglou coal mine,the numerical simulation are performed with the rock-air coupled heat transmission model.The solid heat transfer and flow boundary layer theory are employed and then the model is examined by the field monitored data,which shows the model is reliable in working face cooling simulation.With the simulating results for different HEMS working conditions,the temperature field and velocity field at working face are obtained,and the system optimizing parameters are also provided with 17 centigrade and 3m/s outlet velocity.The model and simulating test methods may provide basis and ideas for similar ventilation and cooling systems optimization.