等压扩散下CO_2对不同变质程度煤中CH_4置换效应的影响  

Influence of CO_2 on the replacement effect of CH_4 in coal of different metamorphic grade under isobaric diffusion

作　　者：杨宏民[1,2] 梁龙辉 YANG Hongmin;LIANG Longhui(School of Safety Science and Engineering,Henan Polytechnic University,Jiaozuo 454003,China;MOE Engineering Center of Mine Disaster Prevention and Rescue,Jiaozuo 454003,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454003 [2]煤矿灾害预防与抢险救灾教育部工程研究中心,河南焦作454003

出　　处：《煤田地质与勘探》2018年第5期55-59,65,共6页Coal Geology & Exploration

基　　金：国家自然科学基金项目(51174081);河南省高校科技创新团队支持计划项目(17IRTSTHN030);教育部创新团队发展支持计划项目(IRT-16R22)~~

摘　　要：为了研究等压扩散条件下不同变质程度煤中CO_2置换CH_4特征规律,选择无烟煤、瘦煤和气肥煤3种煤样,进行了不同等压扩散压力下的等压扩散置换实验。实验结果表明:随着煤变质程度的增加煤吸附CH_4和CO_2的能力表现出逐渐增强的趋势,且CO_2的吸附量大于CH_4的吸附量;随着实验点扩散压力的增加,CO_2对CH_4的绝对置换量和置换率均随之增加,CO_2对CH_4的注置比却随之降低。在实验煤样变质程度范围内,CH_4置换率与煤变质程度和CO_2注置比均呈负相关关系。研究成果对井下注CO_2置换煤层CH_4的工程技术和理论具有指导意义。To study the characteristics of CH4 replacement by CO2 under isobaric diffusion,samples of metamorphic coal,anthracite,lean coal and gas-fat coal were selected to carry out experiment of isobaric diffusion replacement under different isobaric diffusion pressure.Experimental results show that with the increase of coal metamorphism,the CH4 and CO2 adsorption capacity of coal is gradually enhanced,and the CO2 adsorption capacity of coal is greater than CH4;with the increase of diffusion pressure at the experimental point,the absolute volume and replacement rate of CO2 for CH4 increases,but the CH4 replacement ratio of CO2 injection decreases.In the range of the metamorphic degree of the experimental coal samples,the CH4 replacement rate is negatively correlated with the coal metamorphism degree and ratio of replacement to CO2 injection.The research results have guiding significance for the engineering technology and the theory of CH4 replacement by injecting CO2 into coal seam.

关 键 词：等压扩散 煤的变质程度 CH4置换率 CO2注置比 

分 类 号：P618.130.2[天文地球—矿床学]