TY  - EJOU
AU  - Wang, Haitao 
AU  - Zhang, Pengxin 
AU  - Li, Weihao 
AU  - Li, Baogang 
AU  - Xiong, Xianghui 

TI  - Characterizing and Stage-Wise Differentiation of Coal Spontaneous Combustion in Deep Mines
T2  - Energy Engineering

PY  - 2025
VL  - 122
IS  - 4
SN  - 1546-0118

AB  - Deep mining, characterized by high stress, elevated geothermal gradients, and significant moisture content, significantly increases the risk of Coal Spontaneous Combustion (CSC), posing a major threat to mine safety. This study delves into the impact of these factors on the self-ignition properties of coal, leveraging data from four distinct mines in Heilongjiang Province, China: Shuangyashan Dongrong No. 2 Mine, Hegang Junde Coal Mine, Qitaihe Longhu Coal Mine, and Jixi Ronghua No. 1 Mine. We have honed the theoretical framework to account for variations in gas content during CSC. Our investigation, conducted through programmed temperature rise experiments, scrutinized the generation and temperature-dependent evolution of gases, emphasizing individual indicators such as CO, O<sub>2</sub>, and C<sub>x</sub>H<sub>y</sub>, in addition to composite indicators like the ratio of change in CO to change in O<sub>2</sub> concentration (:) and the ratio of C<sub>2</sub>H<sub>4</sub> to C<sub>2</sub>H<sub>6</sub>. These insights have catalyzed the development of a CSC state energy level transition model and a precise method for phase-based quantification of combustion progression. Our findings furnish a scientific foundation for the formulation of early warning and prevention strategies in deep mining settings.
KW  - Deep mine; coal spontaneous combustion; gas change rate; index threshold

DO  - 10.32604/ee.2025.062844