软硬煤瓦斯解吸规律及影响因素的实验研究

发布时间：2018-06-14 17:03

本文选题：瓦斯解吸规律 + 软硬煤　；参考：《中国安全生产科学技术》2017年03期

【摘要】：为了研究软硬煤瓦斯解吸规律,搭建了大质量瓦斯解吸实验系统,进行了不同变质程度软硬煤的瓦斯解吸实验,对比分析了软硬煤的孔隙结构特征,查明了软硬煤的瓦斯解吸规律及影响因素。研究结果表明:软煤相对于硬煤,具有更多的瓦斯解吸总量和更快的解吸速度,采用幂函数可以较好的描述软硬煤的解吸规律,煤的破坏类型和变质程度是影响瓦斯解吸量的主要因素;软硬煤瓦斯解吸规律的差异性主要受煤的孔隙结构影响,软煤总孔容是硬煤的1.18~2.14倍,且软煤中孔及大孔更为发育,这为瓦斯解吸提供了更优质的通道;软煤相对硬煤在同等条件下变质程度更高,煤吸附甲烷的能力更强,这有利于软煤瓦斯解吸量的增加及解吸速度的加快。研究成果为准确测试煤层瓦斯含量和钻屑解吸指标提供了理论依据。
[Abstract]:In order to study the law of gas desorption of soft and hard coal, a large mass gas desorption experiment system was set up, and the gas desorption experiments of soft and hard coal with different metamorphism degrees were carried out, and the pore structure characteristics of soft and hard coal were compared and analyzed. The law of gas desorption of soft and hard coal and its influencing factors are found out. The results show that compared with hard coal, soft coal has more total gas desorption and faster desorption speed, and the law of desorption of soft and hard coal can be better described by using power function. The destruction type and metamorphic degree of coal are the main factors affecting the gas desorption amount, the difference of the law of gas desorption between soft and hard coal is mainly affected by the pore structure of coal, the total pore volume of soft coal is 1.18 ~ 2.14 times of that of hard coal, and the medium and large pores of soft coal are more developed. This provides a better way for gas desorption, and soft coal has higher metamorphic degree than hard coal under the same conditions and stronger ability to adsorb methane, which is beneficial to increase the amount of gas desorption and speed up desorption of soft coal. The research results provide theoretical basis for accurate measurement of coal seam gas content and desorption index.
【作者单位】：河南理工大学河南省瓦斯地质与瓦斯治理重点实验室——省部共建国家重点实验室培育基地;煤炭安全生产河南省协同创新中心;
【基金】：国家自然科学基金(51404099,51374095,51604092)
【分类号】：TD712

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