Compressed air is an air-loaded energy flow. It relies on surface air compressors to convert electrical energy into air's compression energy, which is sent to the well and used as a power for the compressor to serve mining. Because the compressor has simple structure, light weight and firmness, and is not afraid of humidity, the gas pipeline is easy to repair and prolong, and it is easy to detect and repair when leaking. At present, most mines in China still use compressed air as the power for underground rock drilling and loading. In the mine, the compressed air is a special working medium, which can provide the power needed for underground production. After expansion, it can absorb the heat in the surrounding air. It has the function of cooling and cooling in the high temperature hot mine and improving the working environment. Therefore, the gas is the most ideal environment-friendly power in the high-temperature mine. The characteristics of the compressed air expansion and heat absorption have long been recognized, but the effect of the high-pressure working face on the air-cooling, the amount of heat absorbed by the compressed air, its economy, practicality and The perfection and rationality of the design and use of pipe network and export, the previous studies are few, still need to be deeply studied and explored. 2 Compressed air expansion and heat absorption in the transmission and use, obey the law of conservation of energy and thermodynamics The law of energy is the difference of motion velocity of gas, m/s; Az is the position difference of air, m; AWt is the external air The difference in power, in the position of the compressed air, the pressure gas expands, the speed difference and the difference between the outlets are 0, and the electricity consumption is 0.13kW.h, according to the mine price of 0. 35 yuan / kW.h, the pressure is compressed. The unit cost is 0. In contrast, other water cooling, air cooling or central centralized cooling methods are used for ventilation cooling, and the cooling cost includes equipment investment, equipment management and maintenance, equipment moving operation, etc. The impact of downhole harsh conditions, especially mines with spontaneous or oxidative corrosion of sulfide ore, equipment and pipeline damage is a major component of cooling costs, and the cost of cooling will be high, which seriously hinders the use and promotion of these methods. It is very convenient and effective to use local pressure to reduce the temperature. It is an excellent method for local cooling in deep wells in China.

4 Conclusion With the rapid development of the national economy, the demand for mineral products in China will grow rapidly. It is estimated that by 2010, the annual demand for non-ferrous metal ore in China will be 2.4 billion T, and the ore gap will exceed 100 million T. After the mine is exhausted, it will be shut down or transferred to underground mining, and the mineral deposits in the shallow part of the 90% of the underground mines have already been harvested and must be advanced to the deep, and most of the new mines are buried deep, deep wells and high-temperature mines and The number of working locations will increase significantly, and the problem of ventilation cooling is imminent.

From the current stage of China's deep well heat problem and its severity, most of them are mainly local heat damage. Compared with the real deep wells in foreign countries (the mining depth is more than 1600m) and the mining depth of 5,000m in South Africa, there are very few mines in China that require large-scale centralized cooling and cooling. Therefore, the main technical direction of deep well ventilation cooling in China is still to increase the air volume ventilation combined with the local cooling and cooling. That is to say, under the premise of large air volume ventilation, the local operation site adopts the method of cooling and cooling ventilation. Compressed air is a common or even necessary power source for underground mines. The inflated heat absorption, cleanliness, safety and other significant advantages of the compressed gas may make it the main method for local cooling of the deep well high temperature working surface in China. It is important to further improve the energy utilization rate of the compressed air and reduce the air leakage rate. Improve the outlet structure of the compressed air, increase the expansion and heat absorption coefficient of the compressed air, and compress the air for local cooling in the underground.

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