中国矿山工程

On the background of coal seam water injection and dust prevention of Yangquan No.2 Coal Mine, it is found that in the construction process of high pressure water injection to wet the coal seam, the water entering the coal pore and fracture can drive away the gas from the macro level and realize competitive adsorption with the original adsorbed gas from the micro level. On the basis of the above, this paper conducts experimental research on the coal gas desorption with different water content and different water injection volume. The results indicate that there is a functional relationship between the water content and the gas adsorption limit. The desorption amount of gas-containing coal body increases with the increase of water injection, and the effect of gas displacement by water injection is obvious.