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Influence of pore structure and surface free energy on the contents of adsorbed and free methane in tectonically deformed coal

机译：孔隙结构和表面自由能对构造变形煤中吸附和游离甲烷含量的影响

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摘要

Differences in pore and surface free energy affect the occurrence of adsorbed and free methane in tectonically deformed coal (TDC), which influences coalbed methane extraction and coal mine safety. Therefore, eight middle-rank TDC samples from the Yueliangtian coal mine (Guizhou Province, Southwest China) were screened. Pore volume and specific surface area were explored via mercury intrusion, nitrogen adsorption/desorption, and carbon dioxide adsorption approaches. Based on the low-field nuclear magnetic resonance analysis for powdered TDC, the relaxation time (T-2) amplitudes and the contents of adsorbed and free methane, the surface free energy reduction (SFER), and adsorption potential were measured. 1) The pore specific surface area, pore volume, T-2 amplitudes and contents of adsorbed and free methane, SFER, and adsorption potential of the strongly deformed coal are obviously larger than those of the weakly deformed coal. Adsorbed methane content is dominantly affected by micropore specific surface area, and free methane content is primarily influenced by macropore volume. 2) The methane T-2 spectra of the TDC contain three distinctive peaks; the first, P-1 (T-2 2 ms), represents adsorbed methane, and the second, P-2 (2-40 ms), corresponds to free methane. As the pressure increases, both the T-2 amplitude rate and content rate of adsorbed methane decrease, while those of free methane rise. 3) With the enhancement of tectonic deformation, the specific surface area and volume of pores increase (especially those of micropores and macropores), more adsorption positions and storage space for adsorbed and free methane become available, and the SFER and adsorption potential of the TDC are enhanced, leading to increases in the T-2 amplitudes and contents of adsorbed and free methane. The present research will help improve the accuracy of coalbed methane evaluation and the prevention of coal and gas outbursts.
机译：孔隙和表面自由能的差异影响了根本变形煤（TDC）中吸附和游离甲烷的发生，这影响了煤层气萃取和煤矿安全性。因此，筛选了来自Yueliangtian煤矿（贵州省）的八种中等级别的TDC样本。通过汞侵入，氮吸附/解吸和二氧化碳吸附方法探索孔体积和比表面积。基于粉末TDC的低场核磁共振分析，测量弛豫时间（T-2）振幅和吸附和游离甲烷的含量，表面自由能量还原（SFER）和吸附电位。 1）孔比表面积，孔体积，T-2幅度和吸附和游离甲烷，果汁和吸附势的含量明显大于弱变形煤的煤炭。吸附的甲烷含量受到微孔特异性表面积的显着影响，游离甲烷含量主要受大孔体积的影响。 2）TDC的甲烷T-2光谱含有三个独特的峰;第一P-1（T-2 <2ms）表示吸附的甲烷，第二P-2（2-40ms）对应于游离甲烷。随着压力的增加，T-2幅度率和吸附甲烷的含量降低，而游离甲烷升高。 3）随着构造变形的提高，比表面积和孔的体积增加（尤其是微孔和大孔的体积），吸附位置和吸附和游离甲烷的储存空间可获得，以及TDC的鼠标和吸附潜力增强，导致T-2振幅和吸附和游离甲烷的含量增加。本研究将有助于提高煤层气评价的准确性和煤气爆发的预防。

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  • 来源
    《Fuel》 |2021年第1期|119087.1-119087.11|共11页
  • 作者

    Lu Guanwen; Wei Chongtao; Wang Jilin; Meng Ruiyan; Tamehe Landry Soh;

  • 作者单位

    China Univ Min & Technol Minist Educ Key Lab Coalbed Methane Resource & Reservoir Form Xuzhou 221008 Jiangsu Peoples R China;

    China Univ Min & Technol Minist Educ Key Lab Coalbed Methane Resource & Reservoir Form Xuzhou 221008 Jiangsu Peoples R China;

    China Univ Min & Technol Minist Educ Key Lab Coalbed Methane Resource & Reservoir Form Xuzhou 221008 Jiangsu Peoples R China;

    Jiangsu Design Inst Geol Mineral Resources Xuzhou 221006 Jiangsu Peoples R China;

    Univ Yaounde I Dept Earth Sci POB 3412 Yaounde Cameroon;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Tectonically deformed coal; Adsorbed and free methane; Nuclear magnetic resonance; Pore structure; Adsorption potential;

    机译：构造变形煤;吸附和游离甲烷;核磁共振;孔结构;吸附潜力;

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