构造煤与原生结构煤孔隙特征及瓦斯解吸规律试验

发布时间：2018-06-28 21:39

本文选题：构造煤 + 原生结构煤　；参考：《煤炭科学技术》2017年03期

【摘要】：为了研究卧龙湖矿8煤层构造煤与原生结构煤孔隙特征及瓦斯解吸规律,分别采用压汞法和解吸试验对4组煤样进行试验研究。试验结果表明:构造煤中孔和大孔孔容所占比例高于原生结构煤,构造作用对煤的中孔和大孔有明显的改造效果,而且可能产生新的微孔和小孔;构造煤微孔和小孔的比表面积和分别占总比表面积的98.85%和98.74%,原生结构煤微孔和小孔的比表面积和分别占总比表面积的99.52%和99.37%,表明微孔和小孔决定煤的比表面积,构成煤层瓦斯的主要吸附空间;同时构造煤瓦斯解吸能力显著强于相同煤阶的原生结构煤,原因在于构造煤含有较多的中孔和大孔,为瓦斯的运移提供了通道。构造作用对煤的孔隙结构改造进而影响煤的解吸性能,增加了煤与瓦斯突出的危险性。
[Abstract]:In order to study the pore characteristics of coal and primary structure coal and the law of gas desorption in the 8 coal seam of Wolong Lake mine, the 4 groups of coal samples were tested by pressure mercury method and desorption test respectively. The results showed that the proportion of the mesoporous and large pore volume of the structural coal was higher than that of the primary coal, and the structural effect was obviously transformed to the middle hole and the large pore of the coal. The specific surface area and the specific surface area of the coal micropores and holes are 98.85% and 98.74% respectively, and the specific surface area of the primary structure coal pores and small pores accounts for 99.52% and 99.37% of the total specific surface area respectively, indicating that the specific surface area of the coal is determined by the micropores and small pores, and the main absorption of coal seam gas is formed. At the same time, the coal gas desorption capacity is significantly stronger than the same coal rank as the primary structure coal, the reason is that the structural coal contains more mesopore and large pore, which provides the channel for the gas migration. The structure effect on the coal pore structure transformation and then influence the coal desorption performance, adding the coal and gas outburst risk.
【作者单位】：中国矿业大学安全工程学院;中国矿业大学煤矿瓦斯治理国家工程研究中心;
【基金】：国家自然科学基金资助项目(51574229)
【分类号】：TD712

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