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利用红外热成像手段,对不同压力下煤吸附解吸甲烷过程中瓦斯包演化过程进行了观察,并评估其吸附特征与在煤中的分布规律。研究表明:煤中存在不同尺度与甲烷吸附能力的瓦斯包,吸附/解吸甲烷时,煤中瓦斯包比邻近区域具有更明显的升温/降温现象;吸附压力越大,煤样吸附平衡时间越短。通过图像处理的方法对不同吸附压力条件下的红外热像图中的瓦斯包区域进行提取,可有效计算其甲烷吸附特征。计算表明,随着吸附压力升高,煤体瓦斯包中甲烷集中程度降低。在微米尺度下,煤中瓦斯包分布具有分形特征,且分形维数均在1.95~2.00之间。随着吸附压力升高,瓦斯包中甲烷集中程度降低,不同尺度的瓦斯包均发生了连通演化。
By means of infrared thermal imaging, the evolution process of gas packs during methane adsorption and desorption under different pressures was observed, and its adsorption characteristics and distribution in coal were also evaluated. The results show that there are gas packs with different scales and methane adsorption capacity in the coal, and the methane packs in the coal have more obvious heating / cooling phenomena when adsorbing / desorbing methane. The larger the adsorption pressure, the shorter the coal adsorption equilibrium time . Through the image processing method to extract the gas packet in the infrared thermography under different adsorption pressure conditions, the methane adsorption characteristics can be effectively calculated. Calculations show that as the adsorption pressure increases, the concentration of methane in coal gas packages decreases. At microscale, the distribution of gas packets in coal has fractal characteristics, and the fractal dimensions are between 1.95 and 2.00. With the increase of adsorption pressure, the concentration of methane in the gas packs decreases and the gas packs at different scales have been connected and evolved.