Analysis of temperature rise of low temperature adiabatic oxidation of sulfur-containing “coal-like substances”

ABSTRACT

Spontaneous combustion of coal is one of the main natural disasters in the process of coal mining, and spontaneous combustion of sulfur-containing coal is an urgent problem to be solved. In order to understand the influence of different sulfur structures and sulfur content on spontaneous combustion tendency of coal, the self-developed synchronous temperature compensation adiabatic oxidation experiment system was used to study the oxidation self-heating performance of a series of sulfur-containing “coal-like materials.” Through the analysis of the heating rate of coal containing specific sulfur structure, it is considered that the time of adiabatic oxidation temperature of different organic sulfur “coal” to rise to 70°C is dimethyl sulfoxide > phenylene sulfide > dibenzothiophene. By analyzing the oxidation temperature rise characteristics of organic sulfur models with different sulfur contents, it is believed that the higher sulfur content, the faster the low temperature oxidation reaction of “coal-like substance,” the faster the temperature rise rate, and the shorter the time to reach the uncontrollable self-heating temperature, so the shorter the spontaneous combustion period. In general, in the stage of low temperature oxidation, active sulfur containing small molecules (dimethyl sulfoxide) promote the oxidation temperature rise, stable structure, larger molecular weight of dibenzothiophene slow down the “coal-like” oxidation temperature rise.

KEYWORDS:

• Sulfur-containing coal
• low temperature adiabatic
• oxidation reaction
• automatic temperature compensation system

Acknowledgements

This work was financially supported by Shanxi Provincial Department of Education,(2022L051), Study on oxidative heat release characteristics and spontaneous combustion mechanism of high organic sulfur coking coal; Science and Technology Department of Shanxi Province, Youth Project of Natural Science Foundation of Shanxi Province,(202203021212232), Targeted desulfurization Mechanism of Shanxi High organic Sulfur coking Coal; The Central Government Guide Local Science and Technology Development Fund Project in 2021 (YDZJSX2021B021); 2023 Basic Research Project of Shanxi Province (202203021221294); China Postdoctoral Science Foundation in 2022 (2022M723391).

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

The work was supported by the China Postdoctoral Science Foundation in 2022 [2022M723391]; 2023 Basic Research Project of Shanxi Province [202203021221294]; Shanxi Provincial Department of Education [2022L051]; Youth Project of Natural Science Foundation of Shanxi Province [202203021212232]; The Central Government Guide Local Science and Technology Development Fund Project in 2021 [YDZJSX2021B021].