不同注源气体对煤中CH_(4)吸附扩散行为的影响研究  

Study on effect of different injection source gases on CH_(4)adsorption diffusion behavior in coal

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作  者:李林飞 陆卫东 黄戈[1] 戴凤威[1] LI Linfei;LU Weidong;HUANG Ge;DAI Fengwei(College of Safety Science and Engineering,Liaoning Technical University,Huludao Liaoning 125105,China;School of Safety Science and Engineering,Xinjiang Institute of Technology,Wulumuqi Xinjiang 830023,China;Xinjiang Key Laboratory of Coal Mine Disaster Intelligent Prevention and Emergency Response,Xinjiang Institute of Engineering,Wulumuqi Xinjiang 830023,China)

机构地区:[1]辽宁工程技术大学安全科学与工程学院,辽宁葫芦岛125105 [2]新疆工程学院安全科学与工程学院,新疆乌鲁木齐830023 [3]新疆工程学院新疆煤矿灾害智能防控与应急重点实验室,新疆乌鲁木齐830023

出  处:《中国安全科学学报》2025年第2期175-185,共11页China Safety Science Journal

基  金:国家自然科学基金资助(52204217);新疆维吾尔自治区重点研发任务专项项目(2022B01034-3)。

摘  要:为探究不同注源气体对煤中甲烷(CH_(4))吸附扩散行为的影响,采用巨正则蒙特卡罗(GCMC)与分子动力学(MD)方法,选取不同比例热瓦斯发电尾气(注热、多组分)、常温二氧化碳(CO_(2))(强吸附性、单组分)、常温氮气(N_(2))(弱吸附性、单组分)等3种类型气体,通过与CH_(4)混合,注入煤体后分析吸附情况,并依据其结果,以固定CH_(4)数量为基础,注入上述3种气体,分析其扩散行为变化。结果表明:随着注源气体积占比升高,注入CO_(2)条件下CH_(4)吸附量降低幅度逐渐大于热发电尾气条件,并表现出优于热发电尾气的抑制性能;而注入N_(2)后,CH_(4)吸附量虽有所降低,但始终远大于前两者。在扩散方面,随着注源气体积占比升高,扩散系数呈先升高后降低趋势,且系数始终大于未注气前,注源气体以促进CH_(4)扩散为主;注入N_(2)条件下CH_(4)扩散系数最高且降低幅度最小,促进作用最为明显;而注CO_(2)条件下CH_(4)扩散系数降低幅度最大,促进作用最弱;因此,选取热瓦斯发电尾气进行CH_(4)驱替性价比更佳。To investigate the impact of different injection source gases on the adsorption and diffusion behavior of methane(CH_(4))in coal,three types of gases were selected:hot gas power generation exhaust(heat injection,multi-component),carbon dioxide(CO_(2))at room temperature(strong adsorption,single component),and nitrogen(N_(2))at room temperature(weak adsorption,single component).Using giant canonical Monte Carlo(GCMM)and molecular dynamics(MD)methods,these gases were mixed with CH_(4)and injected into coal to analyze the adsorption conditions.Based on a fixed amount of CH_(4),the changes in diffusion behavior were analyzed after injecting each of the three gases.The results show that with the increase of gas injection ratio,the reduction of CH_(4)adsorption capacity under CO_(2)injection condition is gradually greater than that under thermal power generation tail gas condition,showing better inhibition performance than thermal power generation tail gas.In contrast,although the adsorption capacity of CH_(4)decreases after N_(2)injection,it is always greater than the previous two.In terms of diffusion,with the increase of gas injection ratio,the diffusion coefficient increases first and then decreases,and the coefficient is always larger than before gas injection,and the displacement gas mainly promotes CH_(4)diffusion.Under N_(2)injection,the diffusion coefficient of CH_(4)is the highest and the decrease is the smallest,and the promoting effect is the most obvious.Under the condition of CO_(2)injection,the diffusion coefficient of CH_(4)decreases the most and the promoting effect is the weakest.Therefore,the selection of hot tail gas from gas-fired power generation for CH_(4)displacement is more cost-effective.

关 键 词:甲烷(CH_(4)) 注源气体 吸附扩散行为 扩散系数 热瓦斯发电尾气 

分 类 号:X936[环境科学与工程—安全科学]

 

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