【正文】 ne is refrigeration and heat discharge system in the mine, the other is the heating building and a refrigeration system on the ground. These two systems form the entire circulation and production system[10], which are shown in Fig. 3.Water is the energy carrier of the entire system. It is green and environmentally friendly。C, the geothermal gradient is more than 2 176。C, the mine is referred to as a middlehigh temperature mine. The mining depth of this kind of coal mine is between 800 and 1000 m according to our investigation. Included in this group are mines such as the Xincun and Yaoqiao coal mines. This kind of coal mine has been expanded to deep exploitation. High temperatures at the working face have gradually bee an important factor that limits normal production. Surrounding rock temperatures of laneways are about 35 176。C, this kind of mine is called a normal temperature mine. The mining depth is usually less than 800 m and the temperature of the surrounding rock of the laneway is about 30176。C. If the temperature were to exceed 26176。C. There are 12 coal mines in Henan with working face temperatures exceeding 26176。C and two with working face temperatures exceeding 30176。C at the working faces, six of them with temperatures ranging between 26 and 30 176。C while the temperature at the working faces was between 34 and 36 176。C. The problem of deep mine heat hazard has already seriously affected the energy resource development in China, which needs to be urgently solved. With the increase in mining depth, the temperature of the surrounding rock keeps rising, seriously increasing heat hazard in exploitation and tunneling working faces. During the 1950s and 1960s, serious heat hazard occurred in some deep mines both at home and abroad. In the 1970s, the problem became more widespread with a tendency of developing from a few individual mines to all coal mines. According to some preliminary statistics of mines in foreign countries[3], the air temperature in mines of western South Africa has risen to 50 176。 2) use the heat extracted by HEMS to supply heat to buildings and bath water to replace the use of a boiler, a useful energy saving and environmental protection measure. HEMS has been applied in the Jiahe and Sanhejian coal mines in Xuzhou, which enabled the temperature and humidity at the working faces to be well controlled. Keywords: deep mine heat hazard。Application of HEMS cooling technology in deep mine heat hazard controlHE Manchao1,21School of Mechanics amp。 2) the Sanhejian model with a shortage of source of cold energy and a geothermal anomaly and 3) the Zhangshuanglou model with plenty of source of cold energy. The cooling process of HEMS applied in deep coal mine are as follows: 1) extract cold energy from mine water inrush to cool working faces。 heat hazard control model 1 IntroductionCoal has been the major energy source in China for a long time, occupying an irreplaceable position in the oneoff energy structure. Shallow resources have bee increasingly exhausted as a result of exploitation over long periods. Therefore, most coal mines have had to resort to deep exploitation. In addition, the plex geomechanical environment increases the risk of frequent engineering accidents. This plex geomechanical environment is caused by “the three highs and one disturbance”, ., high ground stress, high ground temperature, high osmotic pressure and intensive disturbance through exploitation[1].There are many local disasters, such as gas explosions, pressure bumps, laneway bottom water inrushes, serious mine pressure, severe deformation and pheological behavior of surrounding rock. However, the high temperature heat hazard in deep mines is the risk of disaster we have to cope with at present. High temperature heat hazard in deep mines affect not only the mechanical properties of surrounding rocks, but also safety in mine production[2]. According to inplete statistics, there are a total of 33 mines in China with a mining depth exceeding 1000 m, with the temperature of the working face reaching 30–40 176。C at the production level. For those mines with a depth exceeding 1000 m, the original rock temperature ranged between 40 and 45 176。 in Jiangsu, the Jiahe and Sanhejian coal mines of the Xuzhou Mining Company, the Yaoqiao coal mine of the Datun Coal and Electricity Company, the Baiji coal mine of the Lianyungang Mining Company and the Liuzhuang coal mine of the Guotou Xinji Company. Included in the investigation in Anhui province was the Panyi coal mine of the Huainan Mining Company and in Henan province, the 4, 6 and 11 mines of the Pingmei Company and the Liangbei coal mine of the Shenhuo Company. At present in China, the coal mines can be divided into three groups, based on investigations of high temperature coal mines at home and abroad and on insitu studies of typical mines on their cooling measures applied to any kind of coal mine.2 Distribution law of ground temperaturesAccording to information provided from these investigations, there are 13 coal mines in Shandong province with temperatures exceeding 26 176。C, three of them with working face temperatures between 26 to 30176。C and three with working face temperatures exceeding 30176。C. Distribution law of ground temperatures in some areas of China were obtained from analyses of ground temperature parameters in several typical mines.Fig. 1 shows relationships among ground temperatures, working face temperatures and depths in the Xintai Suncun coal mine. As shown in the two figures, ground and working face temperatures increase sharply with increase of exploitation depth. High temperature heat hazard at working faces are problems we must face. Fig. 1 Relationship between strata and ventilation temperature at working face and depth in the Suncun coal mineFig. 2 shows the distribution of ground temperatures of the Jiahe coal mine in Xuzhou. We can see from this figure that the temperature bees higher and higher with an increase in depth