Adiabatic spontaneous coal combustion period derived from the thermal effect of spontaneous combustion. (15th January 2022)

• Record Type: Journal Article
• Authors: Yan, Li; Wen, Hu; Liu, Wenyong; Jin, Yongfei; Liu, Yin; Li, Chuansheng
• Is Part Of: Energy. Volume 239:Part B(2022)
• Publication Date: 2022-01-15
• Subjects: Spontaneous coal combustion -- Adiabatic spontaneous combustion period -- Positive leading temperature difference -- Physical similarity; Power resources -- Periodicals; Power (Mechanics) -- Periodicals; Energy consumption -- Periodicals; 333.7905
• DOI: 10.1016/j.energy.2021.122101
• Languages: English
• ISSNs: 0360-5442

Abstract

Abstract: We propose a method for measuring the thermal effect of spontaneous combustion and the adiabatic spontaneous combustion period of coal based on the coupled thermal effects of coal and oxygen. A physical similarity reference test system was established by combining the characteristics of the thermal analyses. Using this system, coal samples from the main coal seam of the Zhao Xian mine, which has high propensity for spontaneous combustion, were tested and analyzed. The adiabatic spontaneous combustion period for coal was determined by curve fitting. Based on the heat equation, the adiabatic spontaneous combustion period for coal from the Zhao Xian coal mine was determined to be 95.9 h. Mutual verification among the adiabatic spontaneous combustion periods of coal was achieved through the same fitting procedure. The error between the two experimental results was less than 0.22 % with 0.01 variance, which proves that the experimental approach is applicable for calculating the adiabatic spontaneous combustion period of the Zhao Xian coal sample. Our results should facilitate theoretical and experimental evaluations of the likelihood of spontaneous coal combustion and its associated risks. Graphical abstract: Image 1 Highlights: A method for measuring adiabatic spontaneous combustion period was proposed. Developed quantitative temperature difference leading heating equipment. Materials with similar physical properties were established for comparative experiments. Two calculation methods are used and the comparison and error analysis were made.