Development of ZL400/660 mine semi-closed screw refrigeration unit

In order to effectively control a high temperature heat disaster phenomenon existed in an underground mine ZL400 /660 mode semi-closed screw refrigerati on unit with refrigerating capacity of 400 k W was developed. The paper introduced the working principle, structure features and main technical index and a surface ground t est was conducted on the operation performance parameters with self made inspection platform. The results showed that the operation of the refrigeration unit was stable. Under the designed condition,an actual refrigerating capacity of the refrigeration unit was 420 k W and the refrigeration performance coefficient reached at 3.4. Based on t he ZL400 /660 mode refrigeration unit as a core,a local cold water and cold wind cooling system was established. The mine water inflow and air retuning applied to the com prehensive thermal drainage could make a dry-bulb temperature within a scope of 100 m near the heading face reduced by 5.6 °C in average,a wet bulb temperature reduc ed by8.5 °C in average and a relative humidity reduced by 20% in average. The high temperature heat disaster occurred from the heading face during the heading period could be controlled in the high level of the mine and the technical and equipment support could be provided to control the high temperature disaster in China mines.