高温热害矿井通风制冷降温技术
Ventilation refrigeration and cooling technology of high temperature heat damaged mine
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摘要: 以巨野矿区新巨龙矿井为对象，对其通风难点和降温难点进行分析，提出井口全风量降温和井下集中式降温相结合的分级降温方法，对比井口风流和综放工作面进风路线的风流温度，研究其降温效果。矿井通风路线延长，井巷断面、方向变化以及分叉或汇合点增多，风流的沿程阻力和局部阻力增加，空气压缩产热增加，风流与围岩的热交换作用加强，加剧了高温矿井热害。井口全风量降温系统用于降低矿井进风口风流温度，将高温风流热量留在地面；井下集中式降温系统用于解决井下工作面的风流降温，经过降温后井筒入口风流温度均保持在19 ℃以下，风流进入井底后沿通风路线上温度相对稳定，整体变化幅度在2 ℃以内，采用井下集中式降温系统后，工作面进回风之间的风流温度差为4 ℃；井口降温和井下降温相结合的分级降温方法能有效改善井下环境。Abstract: Taking Xinjulong Mine in Juye Mining Area as the object, the ventilation difficulties and cooling difficulties were analyzed, and a graded cooling method combining the full air volume cooling at the wellhead and the underground centralized cooling was proposed. The air flow temperature was studied to study its cooling effect. The ventilation route of the mine is extended, the cross section and direction of the tunnel and the bifurcation or convergence point increase, the resistance and local resistance of the wind flow increase, and the heat production of air compression increases. The heat exchange between wind flow and surrounding rock is strengthened, which aggravates the heat damage of high-temperature mines. The full air volume cooling system at the wellhead is used to reduce the air flow temperature at the air inlet of the mine, leaving the high temperature air flow heat on the ground. The underground centralized cooling system is used to solve the air flow cooling of the underground working face. After cooling, the temperature of the air flow at the entrance of the wellbore is kept below 19 ℃. After the air flow enters the bottom of the well, the temperature along the ventilation route is relatively stable, and the overall variation range is within 2 ℃. After adopting the underground centralized cooling system, the temperature difference between the inlet and return air of the working face is 4 ℃. The combination of wellhead cooling and downhole cooling can effectively improve the underground environment.
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