中文摘要：

采用水蒸气吸附法,分别制取了6种不同水分含量的2类煤样进行瓦斯解吸扩散实验.利用Langmuir方程经验公式拟合,计算得到了极限瓦斯解吸量;对解吸实验前10min的甲烷解吸率和槡t进行线性拟合,通过计算得到了极限瓦斯解吸量和初始扩散系数,并分析了水分对瓦斯解吸扩散的影响机理.实验结果表明：水分含量对煤体瓦斯解吸扩散过程有显著影响,0.45 MPa平衡压力下,对于1#煤样,水质量分数由0.46%升高到3.5%时,极限瓦斯解吸量Q∞从8.63mL/g减小到4.24mL/g,降低50.87%,初期解吸率从70.87%减小至34.54%,降低36.33%;对于2#煤样,水质量分数由0.73%升高到4.16%时,Q∞从4.68mL/g减小到2.32mL/g,降低50.42%,初期解吸率从58.14%减小至37.16%,降低了20.98%;水分作用下,煤体瓦斯解吸能力大幅度降低;极限瓦斯解吸量、初期解吸率、初始扩散系数均随水分含量的增加而减小.

英文摘要：

Water vapor adsorption method was used for the preparation of two coal samples with6 different moisture contents for gas desorption and diffusion experiment.Based on the empirical Langmuir equation,the limiting gas desorption amount was calculated.Through the linear fitting between the desorption rate and the√t of data,the limiting gas desorption amount and initial diffusion coefficient were obtained in the first 10 min of the experiments.The effect of moisture on the gas desorption and diffusion was analyzed.The result shows that the moisture content has a significant effect on the gas desorption and diffusion in coal.Under the equilibrium pressure of 0.45 MPa,for 1#coal sample,when the mass fraction of moisture increases from 0.46%to 3.5%,the limiting gas desorption amount Q∞decreases from 8.63 mL/g to4.24mL/g,which reduces by 50.87%,and the initial desorption rate declines from 70.87%to34.54%,which decreases by 36.33%;for 2#coal sample,when the mass fraction of moisture ascends from 0.73%to 4.16%,Q∞decreases from 4.68mL/g to 2.32mL/g,which reduces by 50.42%,and the initial desorption rate diminishes from 58.14%to 37.16%,which diminishes by 20.98%.For the affection of moisture,the capability of gas desorption in coal dramatically decreases;the limiting gas desorption amount,initial desorption rate and initial diffusioncoefficient decrease with the rise of moisture content.