| With the development of national economy and the increase of mineral resources exploitation, most of mining work has been forced into deep or complex geological conditions. With the increase of mining depth, the problem of high temperature deep well thermal has become one of the important factors which restrict the development of the mining industry. Especially in recent years, with the continuous development of science and technology, more and more large equipment has installed in underground, thus the harm of heat in cavern of mechanical and electrical equipment is particularly acute. The working environment at a high temperature is not only easy to cause equipment failure, but seriously threats the physical and mental health of workers and the improvement of the economic benefits of the mine.Therefore, to study the mechanism of heat and mass transfer of mine electromechanical cavern and take effective measures of cooling technology have very important practical significance.Based on the thermodynamics, fluid mechanics and environment engineering disciplines, and the major heating source of air compressor in cavern and air compressor working theory has been analyzed, taking the basic principle of conservation of energy into consideration, the heat transfer mechanism and technology of underground electromechanical cavern condition has been theoretical studied.On the premise of meeting basic assumptions for the heat transfer differential equations, input basic conditions and the prediction solution for airflow temperature in cavern could be obtained. Theoretical analysis of convective heat transfer process has provided a theoretical basis of air compressor cool temperature in cavern.In this paper, the cavern of air compressor in an iron ore mine has been studied. Based on the quality of conservation, momentum & energy conservation at turbulent state, the mathematical model can be established; in the basis of the actual site, its physical model has been established. The Fluent software was applied; the numerical simulation the process for cavern air compressor heat transfer has been made, and the basic rule of cavern air compressor’s air velocity and temperature field on different enters’air velocity and temperature conditions has been researched. Through numerical simulation and field test of temperature and wind speed, then the windbreak was used to adjust the cavern installation and the fan of K-4-Ns 12 was put forword to increase air volume and reduce the romantic inlet temperature, those comprehensive technical measures which could achieve cooling of air compressor cavern in the iron ore mine.The results show that the temperature field affected by the distribution of the flow field, the mutation of cavern shape and the wind flow around exercise are easy to form high temperature vortex area; When the inlet temperature is 15～25℃, the economic and reasonable speed of inlet wind is 3-5m/s; When the inlet wind speed is more than 5m/s, the cavern temperature is without apparent,, decline, but the effect of adopting the method of lower entrance wind temperature is obvious; the practice has proved that three air compressor which its power is132kw are open for the heating resource;under this condition,the inlet temperature of 19.4℃, the inlet wind speed 3.2 m/s, the outlet temperature of the cavern reduced to 30.1℃, the air compressor in cavern operates normally and stablely for more than one year. Effective guarantee was ensured the normal operation of the machinery and equipment in the adit indoor which can provide theoretical guidance and technical support for the cooling technology of the mine cavern and important practical significance to ensure mine production safety. |
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