回采工作面热环境分析与风流冷却方式选择

Analysis on Thermal Environment and Selection of Airflow Cooling Methods in Coal Mining Face

针对影响回采工作面热害因素复杂,供风量不合理的现象,通过对回采工作面热源因素的分析,计算了热源的放热量,建立了风流通过回采工作面的热交换模型,通过控制采区出口的风温在规程允许的范围内(即不超过26℃),计算出了回采工作面入口处的风温及最优风量。当通风降温不能满足要求时,须采用机械降温的方式,为实现最优的机械降温效果,对2种冷却方式的优缺点进行分析。结果表明:在采深不大、岩温不高的工作面采用集中冷却方式;在回采深度大、岩温高的工作面采用分段均匀冷却方式。

According to the complicated thermal disaster factors affected to the coal mining face and the irrational ventilation supply phenomenon,the analysis on the thermal source factors of the coal mining face was applied to calculate the heat releasing value of the thermal source and establish the heat-exchange model of the air flow passing through the coal mining face.With the control of the ventilation temperature at the exit of the mining block within the allowed limit（no more than 26 ℃） of the regulation,the ventilation temperature and the optimum ventilation quantity at the entrance to the coal mining face was calculated.When the ventilation cooling could not meet the requirements,a mechanical cooling method shall be applied.In order to have the optimum mechanical cooling effect,the advantages and disadvantages of two cooling methods were analyzed.The results showed that a centralized cooling method could be applied to the coal mining face with a mining depth not so high and the rock temperature not high and a sectional even cooling method could be applied to the coal mining face with a high mining depth and a high rock temperature.