关键词: 深部矿井, 高温采煤工作面, 风温预测, 冷负荷计算

Abstract: Accurate prediction of the cold load is the basis for formulating a cooling program for high-temperature coal mining face, improving the underground working environment, preventing heatstroke of workers, and breaking the dilemma of high-temperature mines stopping work and production in summer. The cold load calculation method of coal mining face based on the prediction of the wind temperature of the whole wind flow path is proposed in the engineering background of the 10th mine of Ping Coal Co. A numerical model of the temperature field of the coal mining face was established, and the dependence of the inlet air temperature on the temperature value of the temperature control target area was analyzed; the target temperature value of the temperature control target area was set, and the cold load of the coal mining face before and after refrigeration was calculated by the enthalpy difference method. The results of the study show that the temperature control target area is 50 m ahead of the working face at the upper end of the coal mining face, and the dependence relationship between the inlet temperature and the target temperature of the temperature control target area is as follows: y=89.57-72.88×0.99x; the inlet air temperature is 30 ℃ and the temperature of the target area of the temperature control area is 35.7 ℃ before the cooling down. After cooling, the inlet air temperature is 13.6 ℃, and the temperature of the temperature control target area is 26 ℃; the enthalpy of the inlet airflow at the working surface before cooling is 85.53 kJ/kg, and the enthalpy of the airflow at the temperature control target area is 128.88 kJ/kg; after cooling, the enthalpy of the inlet airflow at the working surface is 28.36 kJ/kg, and the enthalpy of the airflow at the temperature control target area is 66.77 kJ/kg; the cold load of the working surface is 2,286.8 kW. The cooling capacity of the refrigeration unit is 2300 kW, and the average temperature of the working surface is reduced by 7℃~10℃ and humidity is reduced by more than 20% after the operation of the unit, so the effect of cooling and dehumidifying is obvious.