Influence of CO2/N2 ratio and O2 volume fraction on low-temperature oxidation characteristics of coal

doi:10.16265/j.cnki.issn1003-3033.2025.03.1568

Abstract

Abstract:

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.

Key words: CO₂/N₂ ratio, O₂ volume fraction, low temperature oxidation, oxygen consumption rate, CO production rate, apparent activation energy

CLC Number:

X937
TD752.2

WU Chunlei, SHI Bobo, XUE Yong, GUO Qingxu. 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.

Figures/Tables 9

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References 16

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煤种	工业分析
煤种	水分/%	灰分/%	挥发分/%	固定碳/%
长焰煤	6.68	10.97	45.96	36.39

Influence of CO₂/N₂ ratio and O₂ volume fraction on low-temperature oxidation characteristics of coal

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序号	煤样	气体/%			CO₂/N₂	序号	煤样	气体/%			CO₂/N₂
序号	煤样	O₂	CO₂	N₂	CO₂/N₂	序号	煤样	O₂	CO₂	N₂	CO₂/N₂
1	长焰	20.9	0	79.1	0∶10	10	长焰	10	0	90	0∶10
2		18	0	82	0∶10	11		10	18	72	2∶8
3		18	16.4	65.6	2∶8	12		10	36	54	4∶6
4		18	32.8	49.2	4∶6	13		10	54	36	6∶4
5		18	49.2	32.8	6∶4	14		10	72	18	8∶2
6		18	65.6	16.4	8∶2	15		10	90	0	10∶0
7		18	82	0	10∶0	16		6	0	94	0∶10
8		14	0	86	0∶10	17		6	94	0	10∶0
9		14	86	0	10∶0

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