首页|Approach to increasing the quality of pressure-relieved gas drained from protected coal seam using surface borehole and its industrial application

Approach to increasing the quality of pressure-relieved gas drained from protected coal seam using surface borehole and its industrial application

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During mining of lower protective coal seam, a surface borehole can efficiently extract not only the pressure-relieved gas from the protected layer, but also the gas from the mining layer gob. If the distance between the borehole and gob is too large, the quantity of gas drained from the protected layer decreases substantially. To solve this problem, a mathematical model for extracting pressure-relieved gas from a protected coal seam using a surface borehole was established, based on the radial gas flow theory and law of conservation of energy. The key factors influencing the quantity of gas and the drainage flow network using a surface borehole were presented. The results show that the quantity of pressure-relieved gas drained from the protected layer can be significantly increased by increasing the flow resistance of the borehole bottom. Application of this method in the Wulan Coal Mine of the Shenhua Group significantly increased the flow of pure gas and the gas concentration (by factors of 1.8 and 2.0, respectively), thus demonstrating the remarkable effects of this method.

Surface boreholeGas drainageBorehole bottom resistancePressure-relieved gas

Yingke Liu、Fubao Zhou、Jianlong Wang、Jun Liu

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School of Safety Engineering, China University of Mining&Technology, Xuzhou 221116, China

This research is supported by the State Key Laboratory for Coal Resources and Safe Mining, China University of Mining & TechnoloNational Science Found for Distinguished Young Scholars of Chinapro-ject funded by the Priority Academic Development of Jiangsu Higher Education Institutions and the Fundamental Research Fundspro-ject funded by the Priority Academic Development of Jiangsu Higher Education Institutions and the Fundamental Research Funds

SKLCRSM13KFB04513254032014ZDPY032014XT02

2015

10.1007/s40789-015-0064-3

煤炭学报(英文版)
中国煤炭学会 煤炭科学研究总院

煤炭学报(英文版)

CSTPCDCSCD
影响因子：0.117
ISSN：1006-9097
年,卷(期)：2015.(1)
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