Analysis and application of mine air heat-sink capacity in deep mine heat hazard control

摘要

Considering factors such as temperature and humidity, this paper proposed a concept of "heat-sink capacity " (HSC) to judge the quantity of heat needed to absorb air under certain conditions. When the absolute heat-sink capacity of air is at a negative value or the relative heat-sink capacity exceeds 100%, the working thermal environment can be regarded as beyond the regulations of the Coal Mine Safety Regulations (China). Under these conditions, steps to lower the temperature are vital. Using No. 2 Coal Mine in Jining of Shandong province in China as an example, we measured the HSC of air in winter and summer and outlined the parameters for variation laws. The variation trends of air heat-sink capacity in the underground mine were found dissimilar to common thermodynamic parameters seen in temperature and humidity. In the intake roads and the faces, the heat-sink ability of air gradually decreased due to heat and moisture absorption. It was lowest when reaching the air outlet of the working face and even became a minus value, changing clearly and directly. As a new concept, the heat-sink capacity of mine air can describe the characters of air thermodynamic parameters and the thermal environment in underground working areas quantificationally and provide further guidelines for cooling load in essential mine cooling.