The Effect of Static Blasting Materials on Coal Structure Changes and Methane Adsorption Characteristics
The Effect of Static Blasting Materials on Coal Structure Changes and Methane Adsorption Characteristics
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DOI：
10.1155/2020/2858621
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发表时间：
2020-08-29
影响因子：
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通讯作者：
Gong, Xuemin
中科院分区：
文献类型：
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作者：
Cui, Xiao;Zhang, Jiayong;Gong, Xuemin
煤层中的瓦斯始终处于吸附和解吸的动态过程中。事实证明，静态爆破技术是从煤中提取甲烷的有效方法。虽然了解静态爆破材料对甲烷提取的作用具有重要意义，但由于研究有限，静态爆破过程中甲烷的变化尚不清楚。本文以静态喷砂材料水化反应压力和热量为主要影响因素。通过扫描电子显微镜、气相色谱、红外光谱和压汞分析了静电爆破材料和煤的微观结构变化。还测量了静态爆破前后甲烷吸附和吸附率的变化。我们的结果表明，静态爆破材料进入煤体的微裂纹，并且煤体的孔隙度因热膨胀而增加，从而改善了甲烷运移。在爆破过程中，甲烷开始从煤中解吸，其吸附量下降。相反，反应后甲烷的吸附增加。但甲烷吸附率高于原煤，说明吸附的甲烷更容易转化为游离甲烷，有利于排放。这对于瓦斯开采和矿山安全具有重要意义。
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.