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为研究注水后煤的瓦斯扩散特征及动力学参数变化,在自制的高压注水搅拌解吸装置上对不同注水量煤样在0.5 MPa吸附平衡压力下的瓦斯放散过程进行了测试,测试结果表明:不同注水量煤样瓦斯解吸量与时间的关系曲线形状均与Langmuir吸附等温线相似,不同注水量煤样均存在极限解吸量,极限解吸量随水分增加呈现指数函数式变化,当煤样水分由0.05%增加到12.04%时,极限解吸量由7.338 3 mL/g降至2.774 9 mL/g。相同吸附平衡压力下,注水量越大,煤样第1 min瓦斯解吸速度(V1)越小,解吸速度V1随水分增加呈现对数函数式变化;注水后,煤样传质毕欧准数增大,扩散系数和传质傅立叶准数减小,注水改变煤的扩散动力学参数。
In order to study the characteristics of gas diffusion and the change of kinetic parameters of coal after water injection, the gas emission process of coal samples with different water injection volumes under 0.5 MPa adsorption equilibrium pressure was tested on the self-made high-pressure water injection stirrer and desorption device. The test results showed that: The relationship between gas desorption amount and time is similar to that of Langmuir adsorption isotherm. The ultimate desorption amount of coal sample with different water injection amounts is the same, and the ultimate desorption amount exponentially changes with the increase of water content. When the water content of coal sample increases from 0.05 The percentage of desorption decreased from 7.338 3 mL / g to 2.774 9 mL / g when% increased to 12.04%. Under the same adsorption equilibrium pressure, the larger the water injection amount is, the smaller the gas desorption rate (V1) in the first minute of coal sample is, and the desorption rate V1 changes logarithmically with the increase of water content. After water injection, Large, diffusion coefficient and mass transfer Fourier quasi-reduction, water injection to change the kinetic parameters of coal diffusion.