Abstract
Coal spontaneous combustion (CSC) is a major disaster threatening coal mine safety; therefore, the investigation of coal spontaneous combustion and oxidation characteristics has been a hot topic in the long term. In this paper, the experimental temperature programmed system is used to carry out the simulation experiment of coal spontaneous combustion and oxidation of three kinds of coal with different metamorphic degrees under three oxygen concentrations (9%, 15%, 21%). The effects of metamorphic degree and oxygen concentration on coal oxidation characteristics were analyzed, and the variation laws of crossing point temperature, three characteristic point temperature, and apparent activation energy were qualitatively discussed. Finally, coal oxidation reaction stages were evaluated and divided. The results show that the concentrations of CO and C2H4 are negatively correlated with the degree of deterioration but increase with the increase of oxygen concentration. High metamorphic coal corresponds to high crossing point temperature (CPT). The average error between the CPT value calculated from the BM empirical correlation and the experimental data is very small, which is 6.42%. The higher the metamorphic degree of coal, the higher the three characteristic temperature points (critical temperature, xerochasy temperature, and activity temperature). The oxidation process of the three coal samples is divided into four stages: surface oxidation, oxidation self-heating, accelerated oxidation, and deep oxidation. The apparent activation energy of each stage exhibits significant variability, with varying patterns displayed with the degree of metamorphism.
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The data used to support the findings of this study are available from the corresponding author upon request.
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Funding
The research was supported by the National Natural Science Foundation of China (Project No. 51974322) and Fundamental Research Funds for the Central Universities (2009KZ03). Meanwhile, thanks to “Outstanding Scholars of Yueqi” for their financial support to corresponding author (Baisheng Nie).
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Hongwei Yan: experiment, methodology, analysis, writing—original and editing. Baisheng Nie: methodology, software, writing—review draft. Peijun Liu: supervision, resources. Zongyu Chen: visualization. Chao Peng: visualization. Xiaotong Wang: investigation. Feifei Yin: visualization. Jie Gong: visualization. Yueying Wei: investigation. Shuangshuang Lin: investigation. Qiang Gao: investigation. Mingwei Cao: investigation.
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Nie, B., Yan, H., Liu, P. et al. Experimental investigation on spontaneous combustion oxidation characteristics and stages of coal with different metamorphic degrees. Environ Sci Pollut Res 30, 8269–8279 (2023). https://doi.org/10.1007/s11356-022-22824-0
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DOI: https://doi.org/10.1007/s11356-022-22824-0