Co-spontaneous combustion of lignite and anthracite: thermal behavior, kinetic characteristics, interaction mechanism

Xun Zhang, Chen Yu, Bing Lu, Fengwei Dai, Ge Huang and Wenting Zhao

Energy, 2025, vol. 332, issue C

Abstract: During coal washing and blending, storage, and transportation processes, the mixing of different coal types is prevalent, which elevates the risk of coal spontaneous combustion. Temperature-programmed oxidation experiments were conducted to simulate the low-temperature oxidation process of blended coals with varying mixing ratios. The actual CO and CO2 values differed from the theoretical values by 1210 ppm and 1884 ppm, respectively. The spontaneous combustion propensity of the samples was evaluated based on calculated thermodynamic parameters such as the lower oxygen concentration limit and heat release intensity. The thermal behavior of mixed coal was simulated by STA experiment, and it was found that the combustion characteristic index, heat release intensity and weight loss rate were significantly enhanced. The performance of H5W5 is obvious in the fourth stage, and the mass difference is about 0.64 %. The competitive endothermic of lignite accelerates its own chemical oxidation exothermic, which leads to the accelerated oxidation of anthracite and induces the overall spontaneous combustion. The research results enrich the oxidation characteristics of mixed coal and provide theoretical support for the prevention and control of spontaneous combustion of mixed coal.

Keywords: Mixed coal; Exothermic intensity; Combustion characteristic parameter; Limiting oxygen concentration; Mixed co-spontaneous combustion (search for similar items in EconPapers)
Date: 2025
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:332:y:2025:i:c:s0360544225028294

DOI: 10.1016/j.energy.2025.137187

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