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Influence of CO2/N2 ratio and O2 volume fraction on low-temperature oxidation characteristics of coal
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Chunlei WU1, 2, Bobo SHI3, Yong XUE2, **, Qingxu GUO4
China Safety Science Journal | 2025, 35(3) : 125 - 132
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China Safety Science Journal | 2025, 35(3): 125-132
• Safety engineering technology •
Influence of CO2/N2 ratio and O2 volume fraction on low-temperature oxidation characteristics of coal
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Chunlei WU1, 2, Bobo SHI3, Yong XUE2, **, Qingxu GUO4
Affiliations
  • 1 School of Environmental Science and Engineering，Nanjing University of Information Science and Technology，Nanjing Jiangsu 210044，China
  • 2 School of Emergency Management，Nanjing University of Information Science and Technology，Nanjing Jiangsu 210044，China
  • 3 School of Safety Engineering，China University of Mining and Technology，Xuzhou Jiangsu 221116，China
  • 4 Nanjing Chenguang Group Co.，Ltd.，Nanjing Jiangsu 210006，China
Published: 2025-03-28 doi: 10.16265/j.cnki.issn1003-3033.2025.03.1568
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To optimize the mixed inert gas fire suppression technique for goafs，the effects of CO2/N2 ratio and O2 volume fraction on the low-temperature oxidation characteristics of coal were investigated. Taking the long flame coal from Dongxia mine in Gansu as the research subject，a temperature-programmed experimental system combined with gas chromatography analysis was employed to carry out low-temperature oxidation experiments under various CO2/N2 ratios (ranging from 0∶10 to 10∶0) and O2 volume fractions (6%，10%，14%，and 18%). The results indicate that at the same O2 volume fraction，as the CO2/N2 ratio increases，the rates of oxygen consumption and CO production of the long-flame coal gradually slow down，with the decline rates increasing as the temperature rises. The apparent activation energy of the long-flame coal increases gradually with the increase in the CO2/N2 ratio during the slow oxidation stage，while it initially increases and then decreases during the accelerated and rapid oxidation stages，reaching the maximum value at a CO2/N2 ratio of 4∶6.

CO2/N2 ratio  /  O2 volume fraction  /  low temperature oxidation  /  oxygen consumption rate  /  CO production rate  /  apparent activation energy
Chunlei WU, Bobo SHI, Yong XUE, Qingxu GUO. Influence of CO2/N2 ratio and O2 volume fraction on low-temperature oxidation characteristics of coal[J]. China Safety Science Journal, 2025 , 35 (3) : 125 -132 . DOI: 10.16265/j.cnki.issn1003-3033.2025.03.1568
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Article Info
doi: 10.16265/j.cnki.issn1003-3033.2025.03.1568
  • Receive Date：2024-10-11
  • Online Date：2025-07-05
  • Published：2025-03-28
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History
  • Received：2024-10-11
  • Revised：2024-12-14
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Affiliations
    1 School of Environmental Science and Engineering，Nanjing University of Information Science and Technology，Nanjing Jiangsu 210044，China
    2 School of Emergency Management，Nanjing University of Information Science and Technology，Nanjing Jiangsu 210044，China
    3 School of Safety Engineering，China University of Mining and Technology，Xuzhou Jiangsu 221116，China
    4 Nanjing Chenguang Group Co.，Ltd.，Nanjing Jiangsu 210006，China
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
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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