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周晋辉, 郭晓阳, 赵博, 金智新, 邓存宝, 刘继勇, 王蒙. 煤岩体系微观组分及孔隙结构对甲烷吸附的影响研究[J]. 矿业安全与环保.
引用本文: 周晋辉, 郭晓阳, 赵博, 金智新, 邓存宝, 刘继勇, 王蒙. 煤岩体系微观组分及孔隙结构对甲烷吸附的影响研究[J]. 矿业安全与环保.
ZHOU Jinhui, GUO Xiaoyang, ZHAO Bo, JIN Zhixin, DENG Cunbao, LIU Jiyong, WANG Meng. Study on the influence of microscopic components and pore structure of coal-rock system on methane adsorption[J]. Mining Safety & Environmental Protection.
Citation: ZHOU Jinhui, GUO Xiaoyang, ZHAO Bo, JIN Zhixin, DENG Cunbao, LIU Jiyong, WANG Meng. Study on the influence of microscopic components and pore structure of coal-rock system on methane adsorption[J]. Mining Safety & Environmental Protection.

煤岩体系微观组分及孔隙结构对甲烷吸附的影响研究

Study on the influence of microscopic components and pore structure of coal-rock system on methane adsorption

  • 摘要: 为了探究煤岩体系微观组分及孔隙结构对甲烷吸附的影响规律,选取沙曲一矿6组煤岩样,通过工业分析、X射线衍射、扫描电镜与能谱分析、低温氮吸附、计算机断层扫描,以及煤岩甲烷吸附实验分别研究煤岩样微观组分、孔隙结构特征对甲烷吸附的影响。研究结果表明:煤样和岩样无机组分质量分数分别为15.82%~0.93%、90.47%~94.68%,均以石英和黏土矿物为主;岩样BET比表面积为3.32~8.70 m2/g、吸附孔体积0.009 5~0.016 9 cm3/g,均大于煤样的BET比表面积和吸附孔体积;岩样孔隙表面粗糙度、孔结构复杂度略大于煤样的孔隙表面粗糙度、孔结构复杂度,与黏土矿物含量高有关。煤岩样甲烷等温吸附曲线均符合朗格缪尔模型,可用极限吸附量VL和朗格缪尔压力pL描述吸附规律;相同吸附温度下,煤样吸附性远大于岩样,岩样存在一定的吸附性。分析得出,煤岩样有机组分含量、黏土矿物含量、表面分形维数、比表面积和吸附孔体积对甲烷吸附过程VLpL影响显著。基于多元线性回归分析了5种因素对甲烷吸附规律的影响关系:有机组分含量高、比表面积大的样品CH4分子极限吸附量VL越大,而黏土矿物含量高不利于吸附甲烷;吸附孔体积越小、黏土矿物含量越高、比表面积越大,朗格缪尔压力pL越大。

     

    Abstract: In order to explore the influence of the micro-components and pore structure of the coal-rock system on methane adsorption, six groups of coal samples of Shaqui No. 1 mine were selected to study the effects of microscopic components and pore structure characteristics on methane adsorption by industrial analysis, X-ray diffraction, scanning electron microscopy and energy spectrum analysis, low-temperature nitrogen adsorption, computed tomography and coal-rock methane adsorption experiments. The research results show that the content of inorganic components in coal samples is 15.82% to 0.93%, and that in rock samples is 90.47% to 94.68%, which are mainly composed of quartz and clay minerals. The BET specific surface area of the rock sample is 3.32 m2/g to 8.70 m2/g and the adsorption pore volume is 0.0095 cm3/g to 0.0169 cm3/g, which are all larger than those of the coal sample. The pore surface roughness and pore structure complexity of the rock sample are slightly larger than those of the coal sample, which are related to the high content of clay minerals. The methane adsorption isotherm curves of coal-rock samples are all in line with the Langmuir model, and the adsorption law can be described by the limit adsorption capacity VL and Langmuir pressure pL; under the same adsorption temperature, the adsorption property of coal samples is much larger than that of rock samples, and there is a certain adsorption of rock samples. The analysis shows that the content of organic components, clay mineral content, surface fractal dimension, specific surface area and adsorption pore volume have significant effects on the VL and pL of the methane adsorption process. Based on multiple linear regression, the influence of 5 factors on methane adsorption was analyzed. The sample with high content of organic components and large specific surface area of CH4 molecule has a larger limit adsorption capacity VL, while high content of clay minerals is not conducive to the adsorption of methane; the smaller the adsorption pore volume, the higher the content of clay minerals and the larger the specific surface area, the higher the greater the Muir pressure pL is.

     

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