Experimental Study on the Conversion Process of Promoting Gas Drainage Mechanism by CO2 Injection

被引：2

作者：

Yang T.-H. ^{[1
]}

Chen L.-W. ^{[1
,2
]}

Yang H.-M. ^{[2
]}

Pei B. ^{[2
]}

机构：

[1] School of Resources & Civil Engineering, Northeastern University, Shenyang

[2] School of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo

来源：

Dongbei Daxue Xuebao/Journal of Northeastern University | 2020年 / 41卷 / 05期

关键词：

CO[!sub]2[!/sub]-ECBM; Displacement effect; Promote gas drainage mechanism; Replacement effect; Timeliness;

D O I：

10.12068/j.issn.1005-3026.2020.05.003

中图分类号：

学科分类号：

摘要：

In order to clarify the mechanism of driving out gas in the coal seam, the soft coal sample of the No.2 coal seam structure was collected in the Xinggong coalfield of western Henan, and the large-scale tests on CO2 injection was performed to drive out coal seam gas injection in laboratory. Results show that the CO2 injection of driving out the gas in the coal seam is a dynamic process, combined with the knowledge of domestic and foreign experts on the gas injection mechanism of coal seam gas displacement, the definition of replacement effect and displacement effect is given. Based on the change of CH4 concentration in the gas outlet, the gas injection process was divided into three stages to study the conversion process of CO2 promoting CH4 mechanism in coal seam. Before CO2 breaks through the cavity, it mainly shows the replacement effect. The replacement effect of CO2 injection is dominant. After CO2 breaks through the cavity, part of the injected CO2 is replaced with CH4, and part of it and CH4 flow out of the cavity, with a concurrent state of replacement and displacement effect. For the whole experimental process, the CO2 replacement effect is more obvious and plays a leading role. © 2020, Editorial Department of Journal of Northeastern University. All right reserved.

引用

页码：623 / 628

页数：5

共 10 条

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