RESEARCH ON TRANSIENT THERMAL STRESS OF COAL MINE VENTILATION AIR METHANE OXIDATION BED

Heat reflux oxidation is a new combustion technology which can achieve gas drainage and thermal efficient recycling. This article fully considering the interaction between the fluid flow field and structure deformation, using one-way FSI method, simulated the transient thermal stress of coal mine ventilation air methane (VAM) oxidation bed, which caused by temperature variation in the heat storage and release processes. Temperature field calculation results shows: with the increase of number of alternate cycles, the temperature of the bed is periodically rise. When the alternate time exceeds 1440 s, the temperature variation of the bed is small, and after the process of endothermic and exothermic, it tends to a stable state. Finally, temperature of the 0 m is maintained at 799 to 868 K; the temperature of 0.1 m is maintained at between 701 and 769 K. Stress field calculation results shows: with the increase of cyclic number, the thermal stress of the oxidation bed hole showed a trend of cyclical rise. Regenerative thermal stress values have a great relationship with the temperature field and its structure. The maximum thermal stress appeared at the entrance of high temperature flue gas, and the maximum value was 62.7M Pa when the heat accumulator temperature periodically stable.