Effects of oxygen concentration and heating rate on coal spontaneous combustion characteristics

Coal spontaneous combustion (CSC), as the central cause of coal fire disasters, gravely threatens the safety and efficiency of coalmine production. We take Huating long flame coal as an example and use simultaneous thermal analyzer to investigate how oxygen concentration and heating rate effects CSC...

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Bibliographic Details
Published in:Journal of thermal analysis and calorimetry 2023-06, Vol.148 (11), p.4949-4958
Main Authors: Zhao, Jia-Rong, Xiao, Yang, Zhong, Kai-Qi, Li, Qing-Wei, Zhai, Xiao-Wei
Format: Article
Language:English
Subjects:
Activation energy
Analysis
Analytical Chemistry
Chemistry
Chemistry and Materials Science
Coal
Coal mines
Combustion
Heat transmission
Heating rate
Inorganic Chemistry
Measurement Science and Instrumentation
Oxygen
Physical Chemistry
Polymer Sciences
Spontaneous combustion
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Summary:Coal spontaneous combustion (CSC), as the central cause of coal fire disasters, gravely threatens the safety and efficiency of coalmine production. We take Huating long flame coal as an example and use simultaneous thermal analyzer to investigate how oxygen concentration and heating rate effects CSC characteristics. The reaction process, variation of characteristic temperature, and heat flow were studied. Besides, the kinetic model and parameters were calculated through Šatava and Ozawa methods. The results indicated that the curve peaks of TG and DSC moved to lower temperatures and the characteristic temperatures gradually decreased when the oxygen concentration changed from 3 to 21%. On the contrary, the curve peaks of TG and DSC moved to higher temperature region and the characteristic temperatures increased as the heating rate rose. The most probable mechanism function of Huating long flame is determined to be Avrami–Erofeev equation ( n  = 3) by calculation. When oxygen concentration is 3% or 21%, CSC showed larger tendency. The higher the heating rate, the larger the apparent activation energy, and harder to occur CSC. These findings provide a basis for discovering the formation and evolution mechanism of coal fires.
ISSN:1388-6150
1588-2926
DOI:10.1007/s10973-023-12041-3