| 注气条件对CO2置换驱替CH4影响的实验研究* |
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| 引用本文： | 耿晓伟,阎晶雪.注气条件对CO2置换驱替CH4影响的实验研究*[J].中国安全生产科学技术,2021,17(11):79-84. |
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| 作者姓名： | 耿晓伟 阎晶雪 |
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| 作者单位： | (1.辽宁工程技术大学 安全科学与工程学院，辽宁 阜新 123000；2.辽宁工程技术大学 矿山热动力灾害与防治教育部重点实验室，辽宁 阜新 123000) |
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| 基金项目： | * 基金项目: 国家自然科学基金项目(51404128) |
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| 摘 要： | 为研究不同注气压力与注气温度对CO2置换驱替煤层CH4的影响规律，利用Materials Studio分子动力学模拟软件，通过煤体在2元组分混合气体间的竞争吸附量、竞争吸附热及能量分布等变化规律，从微观研究煤吸附CH4与CO2之间的机理，并利用物理实验平台，选用3种高变质程度煤进行注CO2置换驱替CH4实验。结果表明:同一种变质程度煤，随着注气压力或注气温度的增大，置换率呈增长趋势、驱替比呈下降趋势、CO2突破时间变短；相同注气压力与注气温度时煤的变质程度越高，置换效率越大、驱替比越小、CO2突破时间越长。并且注气压力对于CO2置换驱替CH4的效果要优于注气温度。
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| 关 键 词： | 注气条件 CO2 CH4 竞争吸附 驱替置换 |
Experimental study on influence of gas injection conditions on CO2 replacement and displacement of CH4 |
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| GENG Xiaowei,YAN Jingxue.Experimental study on influence of gas injection conditions on CO2 replacement and displacement of CH4[J].Journal of Safety Science and Technology,2021,17(11):79-84. |
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| Authors: | GENG Xiaowei YAN Jingxue |
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| Affiliation: | (1.School of Safety Science and Engineering,Liaoning Technical University,Fuxin Liaoning 123000,China;2.Key Laboratory of Mine Thermal Power Disaster and Prevention,Ministry of Education,Liaoning Technical University,Fuxin Liaoning 123000,China) |
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| Abstract: | In order to study the influence of different gas injection pressures and gas injection temperatures on CO2 replacement and displacement of coal seam CH4,the Materials Studio molecular dynamics simulation software was used to study the mechanism between coal adsorption of CH4 and CO2 microscopically through the change laws of the competitive adsorption capacity,competitive adsorption heat and energy distribution of coal in the binary component mixed gas.The physical experiment platform was used to conduct the experiments of CO2 injection for the replacement and displacement of CH4 with selecting three kinds of high metamorphic coals.The results showed that for same kind of metamorphic coal,with the increase of gas injection pressure or temperature,the replacement rate increased,the displacement ratio decreased,and the CO2 breakthrough time became shorter.Under the same gas injection pressure and temperature,the higher the degree of coal metamorphism,the greater the replacement efficiency,the smaller the displacement ratio,and the longer the CO2 breakthrough time.The effect of gas injection pressure on CO2 replacement and displacement of CH4 was better than that of gas injection temperature. |
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| Keywords: | gas injection conditions CO2 CH4 competitive adsorption resplacement and displacement |
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