Research on influence of external moisture on gas desorption characteristics of soft and hard coal
-
摘要: 目前有关软硬煤的研究主要集中在孔隙结构对其瓦斯吸附解吸特征的影响，而对外加水分条件下软硬煤瓦斯解吸特征差异的研究较少。针对该问题，利用煤层高压注水模拟实验装置，开展了不同吸附平衡压力、外加水分含量条件下的正交实验，分析了软硬煤在不同外加水分条件下瓦斯解吸量、瓦斯解吸速度及扩散系数的差异。结果表明：随着外加水分含量的增大，软硬煤的瓦斯解吸量均减小，但软煤的瓦斯解吸量始终大于硬煤；外加水分对软硬煤瓦斯解吸均起到了抑制作用，但对软煤的瓦斯解吸抑制效应强于硬煤；不同吸附平衡压力、外加水分含量条件下，软硬煤的瓦斯解吸速度都是在初始时刻最大，随着时间的延长及外加水分含量的增加，呈现出减小趋势；在吸附平衡压力相同、外加水分含量相近的情况下，软煤瓦斯解吸速度始终大于硬煤；在吸附平衡压力相同、外加水分含量相近的情况下，软煤扩散系数大于硬煤；同一吸附平衡压力下软硬煤的瓦斯扩散系数均随着外加水分含量的增大而减小。Abstract: At present, researches on soft and hard coal mainly focus on influence of pore structure on its gas adsorption and desorption characteristics, but there are few researches on difference of gas desorption characteristics of soft and hard coal under condition of external moisture. In view of the above problem, the orthogonal experiments under different adsorption equilibrium pressure and external moisture content were carried out by using coal seam high-pressure water injection simulation experimental device, and the differences of gas desorption amount, gas desorption speed and diffusion coefficient of soft and hard coal under different external moisture were analyzed. The results show that with the increase of external moisture content, the gas desorption amount of soft and hard coal decreases, but the gas desorption amount of soft coal is always greater than that of hard coal; the external moisture can inhibit the gas desorption of soft and hard coal, but the inhibition effect of soft coal is stronger than that of hard coal; under different adsorption equilibrium pressure and external moisture content, the gas desorption speed of soft and hard coal is the highest at the initial moment, and it shows a decreasing trend with the extension of time and the increase of the external moisture content; under the same adsorption equilibrium pressure and similar external moisture content, the gas desorption speed of soft coal is always higher than that of hard coal and the diffusion coefficient of soft coal is higher than that of hard coal; the gas diffusion coefficient of soft and hard coal decreases with the increase of external moisture content under the same adsorption equilibrium pressure.
-
-
期刊类型引用(5)
1. 贾宏哲，王兆丰，孙永鑫，岳基伟. 含瓦斯型煤多级降压解吸规律研究. 煤矿安全. 2024(05): 61-67 . 
百度学术
2. 朱云龙. 官地矿软煤和硬煤瓦斯解吸规律试验研究. 中国煤层气. 2023(02): 3-7 . 百度学术
3. 孙永鑫，王兆丰，尉瑞，岳基伟，陈海栋. 覆压及水分对含瓦斯煤体渗吸特性的影响研究. 中国安全生产科学技术. 2022(01): 114-119 . 百度学术
4. 卢卫永，刘琦，屈丽娜，张海军. 单轴压缩条件下不同含水率煤体裂纹扩展及破坏模式研究. 工矿自动化. 2022(08): 85-91 . 本站查看
5. 肖鹏，杜媛媛. 构造煤微观结构对其吸附特性的影响实验. 西安科技大学学报. 2021(02): 237-245 . 百度学术
其他类型引用(8)
计量
- 文章访问数: 66
- HTML全文浏览量: 14
- PDF下载量: 17
- 被引次数: 13
下载:
