常压法测定煤层瓦斯含量的误差分析  

Analysis on measurement error of gas content in coal seam by normal atmosphere method

作　　者：赵发军[1,2,3] 刘彦伟 郝富昌[1,3] 左伟芹 ZHAO Fajun;LIU Yanwei;HAO Fuchang;ZUO Weiqin(College of Safety Science and Engineering,Henan Polytechnic University,Jiaozuo Henan 454000,China;State Key Laboratory Cultivation Base for Gas Geology and Gas Control,Jiaozuo Henan 454000,China;Henan Collaborative Innovation Center of Coal Work Safety,Jiaozuo Henan 454000,China)

机构地区：[1]河南理工大学安全科学与工程学院,河南焦作454000 [2]河南省瓦斯地质与瓦斯治理重点实验室一省部共建国家重点实验室培育基地,河南焦作454000 [3]煤炭安全生产河南省协同创新中心,河南焦作454000

出　　处：《中国安全生产科学技术》2018年第3期102-108,共7页Journal of Safety Science and Technology

基　　金：国家自然科学基金项目(51374095,51404099,51604092);河北省矿井灾害防治重点实验室开放基金项目(KJZH2014K05)

摘　　要：为了校正脱气法和常压法测量瓦斯含量的误差。通过理论分析、模型计算和实验对比的方法,研究煤样气体自然成分含二元和三元混合气体时的误差来源。查明气体成分为N_2和CH_4时,该误差可通过系数法进行修正;气体成分含CO_2,CH_4和N_23种气体时,误差可通过扩展的langmuir模型修正。水分对测定误差的影响为:烟煤中含氧官能团与水优先结合后,影响煤孔网吸附点的可达性,导致水分与测定误差线性相关;无烟煤表面积大且表面官能团减少,水分的优先吸附使煤表面性质更均匀,水分与气体分子竞争煤表面的相同吸附点,水分与测定误差负相关。该结论对煤层瓦斯含量测定方法的选择和修正有重要意义。In order to correct the measurement error of gas content by the degassing method and the normal atmosphere method,the error sources when the natural composition of coal sample gas contained the binary and ternary gas mixtures were studied through the methods of theoretical analysis,model calculation and experiment comparision.It was found that the error could be corrected by the coefficient method when the gas composition contained nitrogen and methane,and the error could be corrected by the extended langmuir model when the gas composition contained carbon dioxide,methane and nitrogen.The influence of moisture on the measurement error was that the preferential combination of oxygen-containing functional groups with water in the bituminous coal influenced the accessibility to the adsorption sites of coal borehole net,which caused the linear correlation of the moisture and the measurement error.The anthracite had a large surface area and less surface functional groups,and the preferential adsorption of moisture made the surface properties of coal more homogeneous,then the moisture and the gas molecules competed the same adsorption sites on the coal surface,so the moisture was negatively correlated with the measurement error.The results have important significance for the selection and correction for the measurement methods of gas content in coal seam.

关 键 词：矿山安全 煤层瓦斯含量 常压不可解吸瓦斯量 LANGMUIR模型 

分 类 号：X936[环境科学与工程—安全科学]