长期浸水风干煤瓦斯吸附解吸规律研究  

Study on adsorption and desorption law of coal and gas in long-term immersed air-dried coal

作　　者：宋亚伟 杨胜强[1,2,3] 杨锴 SONG Yawei;YANG Shengqiang;YANG Kai(State Key Laboratory of Coal Resources and Safe Mining,China University of Mining and Technology,Xuzhou 221116,China;School of Safety Engineering,China University of Mining and Technology,Xuzhou 221116,China;Key Laboratory of Gas and Fire Control for Coal Mines,China University of Mining and Technology,Xuzhou 221116,China)

机构地区：[1]中国矿业大学煤炭资源与安全开采国家重点实验室,江苏徐州221116 [2]中国矿业大学安全工程学院,江苏徐州221116 [3]中国矿业大学煤矿瓦斯与火灾防治教育部重点实验室,江苏徐州221116

出　　处：《矿业安全与环保》2020年第5期1-6,共6页Mining Safety & Environmental Protection

基　　金：国家重点研发计划项目(2018YFC0807900);双一流建设自主创新专项“新能源与非常规能源开项目”(2018ZZCX05)。

摘　　要：为了探究长期浸水风干煤对瓦斯的吸附解吸规律,选取未浸水的原煤和浸水15 d、1个月、3个月、5个月的风干煤样,通过瓦斯吸附和解吸实验、液氮吸附实验,研究了不同浸水时间条件下风干煤的瓦斯吸附和解吸变化规律,以及孔隙结构分布特征。研究结果表明:随着浸水时间的增加,煤样累计瓦斯吸附量先减小后增大,对瓦斯的最大吸附量先减小后增大,而Langmuir压力先增大后逐渐减小;15 d浸水风干煤样的瓦斯初期解吸率大于其他长期浸水风干煤样的解吸率,而从1个月到5个月浸水风干煤样的解吸率逐渐降低;随着浸水时间的增加,煤样的BET平均孔径和BJH累计孔容逐渐增大,BET比表面积先减小后逐渐增大,同时与吸附量相关的微孔占比和微孔比表面积呈现先减小后增大的趋势。In order to explore the law of adsorption and desorption of gas by long-term immersed air-dried coal,unsoaked raw coal and air-dried coal immersed in water for 15 days,one month,three months and five months were selected as samples,through gas adsorption and desorption experiments and liquid nitrogen adsorption experiments.The variation law of gas adsorption and desorption and the distribution characteristics of pore structure of soaked coal for different periods were studied.The results show that with the increase of immersion time,the cumulative gas adsorption of coal sample decreases at first and then increases,the maximum adsorption capacity of coal sample to gas decreases at first and then increases,while the Langmuir pressure increases at first and then decreases gradually;the initial desorption rate of 15-day immersed air-dried coal is higher than that of other long-term immersed air-dried coal,while the desorption rate of the average pore size of BET of coal sample and the cumulative pore volume of BJH increase gradually,and the BET specific surface area of coal sample decreases first and then increases gradually,at the same time,the proportion of micropore and the surface area of micropore related to adsorption capacity also decreases at first and then increases.

关 键 词：浸水风干煤 瓦斯吸附 Langmuir拟合曲线 初期解吸率 BET比表面积 微孔占比 

分 类 号：TD712[矿业工程—矿井通风与安全]