Study on Mine Cooling Technique Based on Low Temperature Water Spray in Mine Ventilation Shaft

Abstract：The paper had an analysis on the mine ground thermal sources of the thermal disaster in No. 5 Mine of China Pingmei Shenma Energy and Chemical Group. The cooling system was designed with the low temperature water spray in the mine ventilation shaft of No. 5 Mine. The refrigeration machine unit would produce the low temperature refrigerating water and the refrigerating water would be transpor- ted to the transportation gateway of the coal mining face with the cooling water pipeline. The air flow would be cooled by the air cooler in- stalled in the transportation gateway, the returned water would be back to the refrigeration unit for the refrigeration circulation, the conden- sing heat from the refrigeration would be released with the low temperature water spray in Beishan Mine Shaft and thus the technical prob- lems of the condensing heat releasing in the underground mine could be effectively solved. In order to eliminate the low cool and top hot phenomenon occurred during the cooling of the coal mining face, the low temperature water spray cooling was applied to the upper of the coal mining face. With the site measurement, the outlet cooling range of the coal mining face was 2. 8 ℃ when the water spray was not op-erated and the outlet cooling range of the coal mining face was 4. 8 ℃ when the water spray was operated. The average temperature of the coal mining face reduced by 4 ℃. The moisture content of the air reduced about 6 g/kg and the safety production of the mine with the ground thermal disaster could be ensured.