Enhancing the Safety of Coal Mining by Injecting CO2 into Coalbeds

Fei Mo; Xiao Long Peng; Zhi Min Du

doi:10.4028/www.scientific.net/AMM.694.307

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vol. 694Enhancing the Safety of Coal Mining by Injecting...

Enhancing the Safety of Coal Mining by Injecting CO₂ into Coalbeds

Abstract:

Coal mining begins after coalbed methane (CBM) production which reduces CH₄ concentration in coalbeds. However once CH₄ concentration reaches the explosion limit, the threat of explosion accident in the coal mine will be greatly increased. Based on safety production principle, this paper analyses the feasibility of CO₂ injection through CBM wells to control CH₄ concentration and enhance CBM recovery at the same time during CBM production. Safe concentration of CH₄ is determined according to its explosion limit and safety factor. Combined with numerical simulation, a CH₄ concentration control method by CO₂ injection is proposed: firstly the CO₂ injection standard is calculated to ensure CH₄ safe concentration, and then the optimum CO₂ injection rate (14000m³/d) is determined by comparisons between different injection rates. Finally CO₂ emission reduction and recycle methods are proposed to achieve effective environmental protection and high economic efficiency.

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Periodical:

Applied Mechanics and Materials (Volume 694)

Pages:

307-311

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.694.307

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Online since:

November 2014

Authors:

Fei Mo*, Xiao Long Peng, Zhi Min Du

Keywords:

CO₂ Emission, CO₂ Injection, Coalbed Methane, Explosion Limit, Safe Concentration

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* - Corresponding Author

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