惰化降温耦合作用下的采空区低温CO2注入流量与温度研究

In order to make better use of LCO2 in the prevention of gob coal spontaneous combustion accidents, combining the Xuandong No. two coal mine 209 working face of coal seam III3 actual conditions, using numerical simulation method of FLUENT, the influence of different low temperature CO2 injection volume and temperature in goaf within the highest temperature in oxidation zone, the oxidation zone width and maximum temperature in the high temperature region were studied. It found that with the increase of the injection flow rate, oxidation zone width and temperature downward trend will slow, injection temperature drop has little effect on the hot spots of the return air side, while the maximum temperature zone temperature can be reduced in inlet side of goaf. Research shows that the effect of reduce the goaf oxidation zone width becomes small when injection rate increases to a certain extent, while the cooling effect of the goaf which high-temperature combustion dangerous in return air side existed is poor when injection temperature drop.