Study On Cooling Technology And Evolutional Law Of Tempeature Field In High Temperature Mine

Along with the development of deep coal mining, heat harm has become one of the major problems which dramatically affect the safety mining due to the increasing of mining depth and improvement of mining mechanization. The high temperature environment of deep mining, not only affect the safety and work efficiency, but also harm to the health of underground mining staff. Currently, the environment improvement, heat harm prevention of coal mine and fundamental theory for heat harm control are the main issue for deep mining.On the basis of heat transfer theory, hydrodynamics, coal geology, ventilation theory and mining theory, the heat exchange between inherent source of coal mine and ventilation flow in tunnel was studied. A new classification method for heat source was presented base on spatial dimension of heat source and traditional method for coal mine heat source classification. It includes point source, line source and area source. It’s convenient to determine the temperature field distribution of ventilation flow in coal mine by using the new method. The investigation system for coal mine heat harm was improved through the study on investigation of coal mine heat harm. Numerical simulation was conducted to study the heat exchange between inherent heat resource and ventilation flow of coal mine by utilizing Comsol Multiphysics code. The heat exchange in various conditions and temperature distribution of tunnel were revealed through analyzing numerical simulation results.A numerical model was set up for prediction of ventilation flow pressure, moisture and temperature coal mine, and a prediction method for temperature of flow along ventilation direction was also advanced through the analysis of heat resource distribution in coal mine. The distribution and evolution process of flow temperature were gained through numerical simulation considering heat exchange between various heat resources and turbulent ventilation flow in tunnel. An optimization method for cooling in coal mine was proposed. Numerical results showed that the method could exactly predict the flow temperature after cooling. It could be used as a primary guidance and provided theoretical foundation for cooling design.The practical engineering application was carried out in Donghai mine. A feasible cooling scheme was proposed through synthetic methods of field investigation and theoretical study considering the heat harm in its working face. Numerical study was also conducted to optimize cooling scheme and predict ventilation flow temperature. The comparison between numerical results and that of field investigation showed it can be used to determine the actual mine cooling scheme.