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Characteristics of seepage of microemulsions in coal

机译：煤中微乳液渗流特征

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摘要

In order to improve the permeability of coal seams, Microemulsions (MEs) are used as seepage reagents and their effect is compared with those of distilled water and Sodium Dodecyl Sulfate (SDS) solution. For comparison, the seepage time and permeability of different seepage reagents are measured by a seepage apparatus. Furthermore, the scanning electron microscopy, X-ray diffraction analysis, Fourier transform infrared spectroscopy and contact angle measurement approach are adopted to explore the seepage characteristics of MEs. The results show that MEs take less time than the SDS solution and distilled water for the seepage flow to reach 1 ml, and that MEs have a higher permeability in coal than the SDS solution and distilled water. The reason is that the MEs treated coal has better pore connectivity than the SDS solution treated, water treated and raw coal because its effective seepage pores are enlarged and increased. Moreover, MEs can reduce the content of montmorillonite, and thus reduce the blocking volume in seepage pores. In addition, MEs can increase the oxygen-containing functional groups, and their contract angle with the coal surface is smaller than that of SDS solution and distilled water. Therefore, MEs have better wettability than the SDS solution and distilled water since they can be easily spread on the coal surface and in coal seam pores. As a consequence, they can wet the coal pore wall more easily during seepage, thus reducing the difficulty of the seepage and migration of MEs and enhancing the seepage effect. Therefore, this study on MEs is of great significance to coal seam water injection in deep mining. (C) 2020 Elsevier B.V. All rights reserved.
机译：为了提高煤层的渗透性，微乳液（MES）用作渗流试剂，并将其效果与蒸馏水和十二烷基硫酸钠（SDS）溶液进行比较。为了比较，通过渗流装置测量不同渗流试剂的渗流时间和渗透率。此外，采用扫描电子显微镜，X射线衍射分析，傅里叶变换红外光谱和接触角测量方法来探索MES的渗流特性。结果表明，MES比SDS溶液和蒸馏水的时间较少，渗流流量达到1mL，并且MES在煤中具有比SDS溶液和蒸馏水更高的渗透性。原因是，MES处理的煤具有比其有效渗漏孔的渗透，水处理和原煤具有更好的孔隙连通性，因为其有效的渗流孔隙扩大并增加。此外，MES可以降低蒙脱石的含量，从而减少渗漏孔中的阻挡体积。此外，MES可以增加含氧官能团，它们与煤表面的合同角度小于SDS溶液和蒸馏水。因此，MES具有比SDS溶液和蒸馏水更好的润湿性，因为它们可以容易地铺展在煤表面和煤层孔中。因此，它们可以在渗漏期间更容易地润湿煤孔壁，从而减少了ME的渗流和迁移的难度并增强渗流效应。因此，这项对MES的研究对于深矿井煤层注水具有重要意义。 （c）2020 Elsevier B.v.保留所有权利。

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  • 来源
    《Journal of Molecular Liquids》 |2020年第1期|共10页
  • 作者

    Yan Song; Wang Gang; Wang Qiannan; Li Huaixing; Wang Wenrui;

  • 作者单位

    Shandong Univ Sci &

    Technol Coll Min &

    Safety Engn Room 108 579 Qianwangang Rd Qingdao 266590 Peoples R China;

    Shandong Univ Sci &

    Technol Coll Min &

    Safety Engn Room 108 579 Qianwangang Rd Qingdao 266590 Peoples R China;

    Shandong Univ Sci &

    Technol Coll Min &

    Safety Engn Room 108 579 Qianwangang Rd Qingdao 266590 Peoples R China;

    Shandong Univ Sci &

    Technol Coll Min &

    Safety Engn Room 108 579 Qianwangang Rd Qingdao 266590 Peoples R China;

    Shandong Univ Sci &

    Technol Coll Min &

    Safety Engn Room 108 579 Qianwangang Rd Qingdao 266590 Peoples R China;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 理论物理学;
  • 关键词

    Microemulsion; Seepage; Coal fissure; Clay mineral; Functional group; Wetting;

    机译：微乳液;渗漏;煤裂缝;粘土矿物质;功能群;润湿;

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