摘要
煤层注水是一项综合灾害防突措施,常被应用于瓦斯、粉尘及冲击地压防治。获得煤-水-甲烷三相体系中水分的分布规律,对于揭示含瓦斯煤注水防突、防冲及防尘的机理具有重要的理论意义。对于煤-水-甲烷三相体系中水分分布的测试,无损检测法是一种首选的方法,核磁共振测试技术对于水分分布测试具有其独特的优势,然而采用核磁共振测试煤-水-甲烷三相体系中水分的分布规律时,甲烷分子中氢原子与水分子中的氢原子相互干扰,造成不能准确获得煤-水-甲烷三相体系中水分的分布规律。提出采用氘代甲烷(CD_(4))代替甲烷(CH_(4))研究含瓦斯煤中水分分布,需首先获得煤对CD_(4)及CH_(4)的吸附特性。采用等温吸附试验及分子动力学模拟的方法研究了煤对CH_(4)及CD_(4)的吸附量及等量吸附热。研究结果表明:煤对CH_(4)及CD_(4)的吸附量差别不大,且吸附量与吸附平衡压力满足Langmuir的函数关系;煤对CH_(4)及CD_(4)的等量吸附热随着吸附平衡压力的增加而减小,等量吸附热与瓦斯压力满足指数的函数关系;同一温度条件下,煤对CH_(4)及CD_(4)的等量吸附热差别不大;煤对CH_(4)及CD_(4)的等量吸附热随着温度的减小而增加,且等量吸附热均存在极限值、均为物理吸附。研究结果为采用核磁共振定量研究煤-甲烷-水分三相体系中水分的分布规律奠定理论基础。
Coal seam water injection is a comprehensive disaster outburst prevention measure,which is often applied to the prevention and control of gas,dust and rockburst.Therefore,obtaining the law of water distribution in coal-water-methane three-phase system is of great theoretical significance to reveal the mechanism of outburst prevention,rock burst prevention and dust prevention for coal seam water in⁃jection.For the measurement of water distribution in the coal,water and methane three-phase system,nondestructive testing is a preferred method.Nuclear magnetic resonance testing technology has its unique advantages for the measurement of water distribution.However,when NMR is used to measure the law of water distribution in the coal-water-methane three-phase system,the hydrogen atom in the methane molecule and the hydrogen atom in the water molecule interfere with each other,which makes it impossible to accurately obtain the law of water distribution.In this paper,it is proposed to use deuterated methane(CD_(4)) instead of methane(CH_(4)) to study the law of water distribution in gas-bearing coal.It is necessary to first obtain the adsorption characteristics of coal for deuterated methane and meth⁃ane.The adsorption capacity and the isosteric adsorption heat of coal for deuterated methane and methane were studied by experimental method and molecular dynamics simulation in this paper.The results show that the difference of deuterated methane and methane adsorbed by coal is very small,and the adsorption capacity and adsorption equilibrium pressure meet the Langmuir functional relationship.The isos⁃teric adsorption heat of coal for deuterated methane and methane decreases with the increase of adsorption equilibrium pressure,and the isosteric adsorption heat and gas pressure meet the functional relationship of negative index.At the same temperature,there is little differ⁃ence in the adsorption heat of coal to deuterated methane and methane.The isosteric adsorption heat of coal for deuterated methane and methane inc
作者
岳基伟
李宏
孙永鑫
邵亨威
吕振威
李怀宾
YUE Jiwei;LI Hong;SUN Yongxin;SHAO Hengwei;LYU Zhenwei;LI Huaibin(School of Safety Science and Engineering,Anhui University of Science&Technology,Huainan 232001,China;School of Safety Engineering,Henan University of Engineering,Zhengzhou 451191,China;School of Safety Science and Engineering,Henan Polytechnic University,Jiaozuo 454000,China)
出处
《煤炭科学技术》
CAS
CSCD
北大核心
2022年第11期93-99,共7页
Coal Science and Technology
基金
安徽理工大学高层次引进人才科研启动基金资助项目(2021yjrc45)
安徽省高校自然科学研究重点资助项目(KJ2021A0459)。
