Numerical simulation and analysis of mine ventilation temperature field of integrated mining area in high temperature mine

The paper, taking integrated mining area in high temperature mine as the research object, used two-dimensional numerical simulation for air heat exchange system in filling area and coal.The calculation results show that when the initial temperature for air is 295.95 K and the initial temperature for coal and backfill materials is 313.15 K, the air temperature in the gateway and working face is bellow 304.52 K, the minimum difference of temperature of air, coal and backfill materials in gateway and working face is 0.5 K.The temperature of coal and backfill materials drops from the initial 313.15 K to 299～314 K.The caloric value of the air in gateway, working face and air return entry ranges from 76.17 to 83.10 kJ/kg after heat convection.When dilution and elimination of toxic or harmful gases and dust in working face are mot considered, only decrease of temperature in crossheading and working face is taken into account, Re of 13 808 to 276 170 can meet requirements.Re below 69 040 is appropriate in consideration of small power loss.Considering acquiring and eliminating high temperature gas, Re above 69040 can be used.This conclusion provides an important basis for the comprehensive control of mine heat hazard.