一级热害区回采工作面移动风冷降温技术
Moving Refrigeration and Cooling Technology for Coal Mining Face at the First Level Heat Damage Area
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摘要: 针对孟村煤矿回采工作面的热害情况,研究利用矿井供、排水系统排热的回采工作面移动风冷降温技术。根据孟村煤矿回采工作面热害现状,计算了回采工作面的需冷量。分析了水冷、风冷2种局部制冷降温系统在回采工作面的适用性。针对矿井回采工作面涌水来自煤层顶板、水温不高,现有供、排水系统具备自然冷却涌水的特点,提出制冷机冷却水取自矿井供水管路、排至巷道水沟的回采工作面移动风冷降温技术。选用1台ZLF-450移动风冷机组在首个回采工作面进行试验。结果表明:制冷机冷却水回水温度略高于矿井涌水,与回采工作面涌水在水沟混合后的水温升高仅为0.4 ℃;风冷机组运行正常,能效比达到3.05,工作面平均温度降低2.8 ℃。采用矿井供、排水系统排热,没有为制冷系统铺设任何专用管路,显著降低了系统造价。Abstract: Aiming at the thermal hazards of mining face in Mengcun Coal Mine, a movable air chilled refrigeration system for coal mining face is studied based on the mine water supply and drainage system to reject heat. According to the present situation of thermal hazards in Mengcun Coal Mine, the chilling requirement of coal mining face is calculated. The applicability of two local refrigeration systems, water cooling and air cooling, in coal mining face is analyzed. The characteristics of water gushing from coal seam roof and low water temperature are analyzed. The technology of moving air-chilled refrigeration system in coal mining face is proposed, where the cooling water of refrigeration unit is taken from mine water supply pipeline and discharged to tunnel water ditch. A ZLF-450 movable air-chilled refrigeration unit was selected to test in the first mining face. The results show that: the return water temperature of the cooling water from the refrigerator is slightly higher than that of the mine water, and the water temperature rising after mixing with the water from the mining face in the ditch is only 0.4 ℃; the refrigeration unit operates normally, energy efficiency ratio reaches 3.05 and average temperature of the working face reduces by 2.8 ℃; the system uses mine water supply and drainage system to reject heat without laying any special pipeline for refrigeration system, which greatly reduces the cost of the refrigeration system.
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