Methane in coal seam is always under the dynamic process of adsorption and desorption. It has been demonstrated that the static blasting technology is an effective way to extract methane from coal. Although it is of great significance to understand the role of static blasting materials on methane extraction, the change of methane during static blasting is not well understood due to limited research studies. In this paper, we took the reaction pressure and heat from the hydration of the static blasting materials as the main factors. Microstructure changes in the static blasting materials and coal were analyzed by scanning electron microscopy, gas chromatography, infrared spectroscopy, and mercury injection. Changes of methane adsorption and adsorption rate before and after the static blasting were also measured. Our results demonstrated that the static blasting materials entered the microcracks of the coal body and the porosity of the coal was increased by heat expansion, improving methane migration. During the blasting process, methane began to desorb from the coal and its adsorption content was decreased. In contrast, the adsorption of methane was increased after the reaction. However, methane adsorption rate is higher than that of raw coal, indicating that the adsorbed methane is easier to convert into free methane, which is conducive to emission. This is of great significance to methane extraction and the safety of mines.

中文翻译：

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静态爆破材料对煤结构变化和甲烷吸附特性的影响

煤层中的甲烷始终处于吸附和解吸的动态过程中。已经证明，静态爆破技术是从煤中提取甲烷的有效方法。尽管了解静态爆破材料在甲烷提取中的作用具有重要意义，但是由于有限的研究，人们对静态爆破过程中甲烷的变化知之甚少。在本文中，我们将静态喷砂材料水化的反应压力和热量作为主要因素。通过扫描电子显微镜，气相色谱法，红外光谱法和水银注入法分析了静态爆破材料和煤的微观结构变化。还测量了静态喷砂前后甲烷吸附量和吸附速率的变化。我们的结果表明，静电爆破材料进入了煤体的微裂纹，热膨胀增加了煤的孔隙度，改善了甲烷的运移。在喷砂过程中，甲烷开始从煤中解吸，其吸附量降低。相反，反应后甲烷的吸附增加。然而，甲烷的吸附速率高于原煤，表明吸附的甲烷更容易转化为游离甲烷，有利于排放。这对甲烷提取和矿山安全具有重要意义。甲烷开始从煤中解吸，其吸附量降低。相反，反应后甲烷的吸附增加。但是，甲烷的吸附速率高于原煤，表明吸附的甲烷更容易转化为游离甲烷，有利于排放。这对甲烷提取和矿井安全具有重要意义。甲烷开始从煤中解吸，其吸附量降低。相反，反应后甲烷的吸附增加。但是，甲烷的吸附速率高于原煤，表明吸附的甲烷更容易转化为游离甲烷，有利于排放。这对甲烷提取和矿山安全具有重要意义。