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Experimental comparisons of gas adsorption, sorption induced strain, diffusivity and permeability for low and high rank coals

机译：低阶煤和高阶煤的气体吸附，吸附诱发应变，扩散率和渗透率的实验比较

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摘要

Because of coal pore structure, the adsorption and diffusion behaviors are quite different for low and high rank coals. Differences of gas adsorption-diffusion and adsorption deformation of low and high rank coal and its permeability evolution were carried out in isothermal adsorption experiment and desorption-seepage testing system. The law of adsorption and adsorption induced strain, diffusion of low and high rank coal and its influence on the coal permeability were revealed. It turns out that, the methane adsorption-diffusion and adsorption induced-strain of low and high rank coal increase with the increase of the adsorption equilibrium pressure. Because of the control of pore structure, the diffusion property of low rank coal sample is higher than that of high rank coal sample. And the strain perpendicular to the bedding plane is higher than that parallel to the bedding plane. Sorption-induced strain of high rank coal is higher than that of low rank coal, which is related to the amount of gas adsorption in coal. The Langmuir volumetric strain is about twice as high as that of the low rank coal. The law of gas adsorption deformation of coal can be described by a Langmuir isotherm adsorption equation. The influence of methane adsorption-induced swelling strain on the permeability of high rank coal is higher than that of low rank coal. At a constant effective stress, the permeability of low rank coal is higher than that of high rank coal, and with the increases of adsorption equilibrium pressure, the permeability decline by a negative exponential function of different rank coals; the rate of permeability reduction of high rank coal is higher than that of low rank coal.
机译：由于煤的孔隙结构，低阶煤和高阶煤的吸附和扩散行为有很大不同。在等温吸附实验和解吸-渗漏试验系统中，进行了高低阶煤的瓦斯吸附扩散与吸附变形的差异及其渗透率演化。揭示了吸附和吸附诱发应变的规律，高低阶煤的扩散及其对煤渗透性的影响。结果表明，低阶煤和高阶煤的甲烷吸附扩散和吸附诱导应变随吸附平衡压力的增加而增加。由于孔隙结构的控制，低阶煤样品的扩散性要高于高阶煤样品的扩散性。并且垂直于层理平面的应变高于平行于层理平面的应变。高阶煤的吸附诱导应变高于低阶煤的吸附应变，这与煤中的气体吸附量有关。 Langmuir体积应变约为低阶煤的两倍。煤的气体吸附变形定律可以用Langmuir等温吸附方程描述。甲烷吸附引起的膨胀应变对高阶煤渗透率的影响高于低阶煤。在恒定有效应力下，低等级煤的渗透率高于高等级煤，随着吸附平衡压力的增加，不同等级煤的渗透率呈负指数函数下降。高等级煤的渗透率降低率高于低等级煤。

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  • 来源
    《Fuel》 |2018年第15期|914-923|共10页
  • 作者

    Meng Ya; Li Zhiping;

  • 作者单位
  • 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
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