永川煤矿高温热害防治技术研究与实践

Study and Practices on High Temperature Heat Disaster Prevention and Control Technology in Yongchuan Mine

针对永川煤矿-500 m水平开拓期间掘进工作面产生的高温热害现象,采用局部冷水降温系统,利用矿井涌水和回风综合排热,使掘进工作面附近100 m范围内干球温度平均降低5.6℃,湿球温度平均降低8.5℃,相对湿度平均降低20%。现场实测发现,降温后掘进工作面干球温度与风筒出口干球温度近似为线性关系,与空冷器后风筒内干球温度在一定范围内近似呈二次抛物线关系。此外,掘进工作面附近干湿球温度差值较大,最大可达5～7℃。风流在回头过程中湿交换较大,易形成放大的"回头热"现象。

According to the high temperature heat disaster phenomenon occurred in the heading face of -500 m level during the mine development period of Yongchuan Mine, with the application of the local temperature water cooling system with the mine inrush water and the heat removing with the air retuning ventilation, the dry bulb temperature within 100 m near the heading face was averagely reduced by 5.6 ℃, the wet-bulb temperature was averagely reduced by 8. 5 ℃ and the relative humidity was averagely reduced by 20%. The site measurement found that the dry bulb temperature of the heading face after the temperature cooling had a linear relationship to the dry bulb tem- perature at the exit of the ventilation duct and had a second parabolic relationship to the dry bulb temperature at certain scope in the ventilation duct behind the air cooler. In addition, the wet bulb temperature difference near the heading face was high and could be 5 - 7 ℃ in maximum. There was a high moisture exchange occurred in the air flow retuning process and thus a retuning hot phenomenon would be occurred and enlarged.