水分对受载原煤瓦斯解吸影响的实验研究

Experimental Study on Effect of Moisture on Gas Desorption of Loaded Raw Coal

为研究水分对煤层瓦斯流动的影响规律,以焦作矿区赵固矿原煤为实验对象,利用热流固耦合实验系统完成了不同气体压力条件下含水率分别为0.9%、1.5%、2.2%、3.3%的受载原煤瓦斯解吸实验。实验结果表明:当含水率小于3.3%时,受载原煤100 min累计瓦斯解吸量随水分增加呈线性减小趋势;受载原煤水分增加时解吸速度指数、1 min时刻的瓦斯解吸速度均有减小趋势;当煤层中水分减小时,瓦斯解吸速度衰减的趋势减缓,瓦斯解吸更加平稳,使得工作面煤与瓦斯突出可能性减小。

To study the influence laws of moisture on coal seam gas flow, taking raw coal samples in Zhaogu Mine of Jiaozuo Mining Area as the experimental object, we use thermofluid-solid coupled experiment to complete methane desorption experiment of loaded raw coal with the moisture content of 0.9%, 1.5%, 2.2%, 3.3% respectively under different gas pressure conditions. The experimental results show that the cumulative gas desorption capacity of the loaded raw coal in 100 min is linearly decreased with the increase of moisture when the moisture content is less than 3.3%; the desorption velocity index and the gas desorption velocity at 1 min is decreased when the moisture of the loaded raw coal is increased; the trend of attenuation of gas desorption velocity decreases, and gas desorption is more stable, and the possibility of coal and gas outburst at working face is reduced.