煤中瓦斯包分布特征研究

发布时间：2018-05-18 01:11

本文选题：瓦斯包 + 分形维数　；参考：《地下空间与工程学报》2017年01期

【摘要】：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。
[Abstract]:The evolution process of methane adsorption and desorption of coal under different pressure was observed by infrared thermal imaging, and its adsorption characteristics and distribution in coal were evaluated. The results show that there are gas bundles of different scales and methane adsorption ability in coal. When methane is adsorbed / desorbed, the gas package in coal has a more obvious warming / cooling phenomenon than that in adjacent areas, and the higher the adsorption pressure, the shorter the adsorption equilibrium time of coal sample. The methane adsorption characteristics can be effectively calculated by extracting the gas package region from the infrared thermal image under different adsorption pressures by image processing. The results show that the concentration of methane decreases with the increase of adsorption pressure. At the micron scale, the distribution of gas packets in coal has fractal characteristics, and the fractal dimension is between 1.95 and 2.00. With the increase of adsorption pressure, the concentration of methane in gas ladle decreases, and the connected evolution occurs in different scales of gas bundles.
【作者单位】：太原理工大学矿业工程学院;太原理工大学原位改性采矿教育部重点实验室;
【基金】：国家自然科学基金(21373146,51304142) 山西研究生优秀创新项目(20150016)
【分类号】：TD712

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