Experimental Research on Timeliness of Promoting Gas Drainage by N2 Injection in Coal Bed

被引：1

作者：

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

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

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

Feng Z.-Y. ^{[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：

Chen, Li-Wei (clwlf@163.com) | 1600年 / Northeast University卷 / 38期

关键词：

Carrying; Diffusion; Displacement; N[!sub]2[!/sub]-ECBM; Promoting gas drainage; Timeliness;

D O I：

10.12068/j.issn.1005-3026.2017.07.024

中图分类号：

学科分类号：

摘要：

In order to make clearly the process and features of gas emission by injecting N2, N2 displacement coal seam CH4 tests were performed by using coal bed gas injection displacement experiment device. The results show that N2 displacement coal bed CH4 is a time-dependent process with a gradual decay of drained CH4 concentration, and CH4 flow increases at first and then decreases. Gas injection pressure has significant impact on the displacement effect, the higher the injection pressure, the faster the drained CH4 concentration decay, the larger injection gas flow, the more significant the flow rate increases. During the same time, the higher gas injection displacement pressure is, the larger the drained CH4 volume. According to the theoretical analysis, the mechanisms of injecting N2 displacement coal bed CH4 include the gas displacement, the air carrying and the dilution and diffusion of gas flow. © 2017, Editorial Department of Journal of Northeastern University. All right reserved.

引用

页码：1026 / 1030

页数：4

共 11 条

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