Investigating the Influence of Flue Gas Induced by Coal Spontaneous Combustion on Methane Explosion Risk

Hu, Sijia; Li, Yanjun; Zhu, Chuanjie; Lin, Baiquan; Li, Qingzhao; Li, Baolin; Huang, Zichao

doi:10.3390/fire7040105

Open AccessArticle

Investigating the Influence of Flue Gas Induced by Coal Spontaneous Combustion on Methane Explosion Risk

by

Sijia Hu

^1,2,3,

Yanjun Li

^1,2,3,*,

Chuanjie Zhu

^2,3,

Baiquan Lin

^2,3,

Qingzhao Li

^2,3,

Baolin Li

^1,2,3 and

Zichao Huang

^4,*

¹

School of Environment and Safety Engineering, North University of China, Taiyuan 030051, China

²

Key Laboratory of Gas and Fire Control for Coal Mines, Ministry of Education, China University of Mining and Technology, Xuzhou 221116, China

³

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

⁴

Industrial Safety Research Branch, China Coal Technology and Engineering Group Chongqing Research Institute, Chongqing 400037, China

^*

Authors to whom correspondence should be addressed.

Fire 2024, 7(4), 105; https://doi.org/10.3390/fire7040105

Submission received: 12 February 2024 / Revised: 15 March 2024 / Accepted: 21 March 2024 / Published: 22 March 2024

(This article belongs to the Special Issue Fire/Explosion Risk Assessment and Loss Prevention of Hazardous Materials, Mines and Natural Gas)

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Abstract

During the process of coal spontaneous combustion (CSC), a plethora of combustible gases alongside inert gases, such as CO₂, are copiously generated. However, prior investigations have regrettably overlooked the pivotal influence of inert gas production on the propensity for methane explosions during CSC. To investigate the impact of the flue gas environment generated by CSC, containing both combustible and inert gases, on the risk of methane explosion, a high-temperature programmed heating test system for CSC was employed to analyze the generation pattern of flue gas. It was found that CO, CO₂, and CH₄ were continuously generated in large quantities during the process of CSC, which are the main components of CSC flue gas. The effect of the concentration and component ratio (C_CO2/C_CO) of the flue gas on the methane explosion limit was tested. It was found that the CSC flue gas led to a decrease in the methane explosion limit, and that the explosion limit range was facilitated at 0 < C_CO2/C_CO < 0.543 and suppressed at C_CO2/C_CO > 0.543. As the temperature of CSC increases, the risk of methane explosion is initially suppressed. When the coal temperature exceeds 330~410 °C, the explosion risk rapidly expands.

Keywords: coal spontaneous combustion; gas generation; methane explosion; explosion limit; risk assessment

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MDPI and ACS Style

Hu, S.; Li, Y.; Zhu, C.; Lin, B.; Li, Q.; Li, B.; Huang, Z. Investigating the Influence of Flue Gas Induced by Coal Spontaneous Combustion on Methane Explosion Risk. Fire 2024, 7, 105. https://doi.org/10.3390/fire7040105

AMA Style

Hu S, Li Y, Zhu C, Lin B, Li Q, Li B, Huang Z. Investigating the Influence of Flue Gas Induced by Coal Spontaneous Combustion on Methane Explosion Risk. Fire. 2024; 7(4):105. https://doi.org/10.3390/fire7040105

Chicago/Turabian Style

Hu, Sijia, Yanjun Li, Chuanjie Zhu, Baiquan Lin, Qingzhao Li, Baolin Li, and Zichao Huang. 2024. "Investigating the Influence of Flue Gas Induced by Coal Spontaneous Combustion on Methane Explosion Risk" Fire 7, no. 4: 105. https://doi.org/10.3390/fire7040105

APA Style

Hu, S., Li, Y., Zhu, C., Lin, B., Li, Q., Li, B., & Huang, Z. (2024). Investigating the Influence of Flue Gas Induced by Coal Spontaneous Combustion on Methane Explosion Risk. Fire, 7(4), 105. https://doi.org/10.3390/fire7040105

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Investigating the Influence of Flue Gas Induced by Coal Spontaneous Combustion on Methane Explosion Risk

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