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Numerical simulation of CO2 injection for fire prevention in a goaf affected by normal fault influence
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Jiayong ZHANG1, 2, Zuxin LYU1, Xiao CUI1, 2, 3, **, Liwen GUO1, 2, Jianguo WU3, Jingbin FU4
China Safety Science Journal | 2025, 35(4) : 9 - 17
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China Safety Science Journal | 2025, 35(4): 9-17
• Safety engineering technology •
Numerical simulation of CO2 injection for fire prevention in a goaf affected by normal fault influence
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Jiayong ZHANG1, 2, Zuxin LYU1, Xiao CUI1, 2, 3, **, Liwen GUO1, 2, Jianguo WU3, Jingbin FU4
Affiliations
  • 1 School of Emergency Management and Safety Engineering，North China University of Science and Technology，Tangshan Hebei 063210，China
  • 2 Key Laboratory of Mining Development and Safety Technology of Hebei Province，Tangshan Hebei 063210，China
  • 3 Kailuan (Group) Limited Liability Company，Tangshan Hebei 063000，China
  • 4 Jizhong Energy Fengfeng Group limited Liability Company，Handan Hebei 056001，China
Published: 2025-04-28 doi: 10.16265/j.cnki.issn1003-3033.2025.04.1231
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To address the issue of natural coal ignition in goaf under normal fault geological structures，the oxygen consumption rate and heat release intensity of coal samples were measured using a temperature-programmed oxidation device. Based on a porous media model of the goaf and the gas component transport equation，a numerical model for CO2 injection via side pressure into the goaf influenced by normal faults was established. The numerical model was used to simulate the mechanism by which the variation in the distance between the working face and the fault affects the width of spontaneous combustion oxidation band in the goaf，and analyze gas migration characteristics under different CO2 injection locations and flow rates. The results indicate that as the distance between the working face and the fault increases，the width of the oxidation band initially increases and then decreases，reaching a maximum width at 70 m from the fault. With the increase of CO2 injection depth，the oxidation band width initially decreases and then increases again，reaching a minimum width when the CO2 injection position is 40 m from the working face. Furthermore，with the increase of CO2 injection volume，the width of the oxidation band width decreases following a negative exponential trend. When the CO2 injection rate is 1000m3/h and CO2 volume fraction at the working face is below 0.4% for safety，width of the oxidation band reaches its minimum.

goaf  /  normal fault  /  CO2 fire prevention  /  numerical simulation  /  coal spontaneous combustion  /  oxidation band width
Jiayong ZHANG, Zuxin LYU, Xiao CUI, Liwen GUO, Jianguo WU, Jingbin FU. Numerical simulation of CO2 injection for fire prevention in a goaf affected by normal fault influence[J]. China Safety Science Journal, 2025 , 35 (4) : 9 -17 . DOI: 10.16265/j.cnki.issn1003-3033.2025.04.1231
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Year 2025 volume 35 Issue 4
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Article Info
doi: 10.16265/j.cnki.issn1003-3033.2025.04.1231
  • Receive Date：2024-12-05
  • Online Date：2025-07-05
  • Published：2025-04-28
Article Data
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History
  • Received：2024-12-05
  • Revised：2025-02-18
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Affiliations
    1 School of Emergency Management and Safety Engineering，North China University of Science and Technology，Tangshan Hebei 063210，China
    2 Key Laboratory of Mining Development and Safety Technology of Hebei Province，Tangshan Hebei 063210，China
    3 Kailuan (Group) Limited Liability Company，Tangshan Hebei 063000，China
    4 Jizhong Energy Fengfeng Group limited Liability Company，Handan Hebei 056001，China
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多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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