Journal
ENERGY
Volume 239, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.energy.2021.122101
Keywords
Spontaneous coal combustion; Adiabatic spontaneous combustion period; Positive leading temperature difference; Physical similarity
Categories
Funding
- National Key RAMP
- D Program of China [2018YFC0808201]
- China Postdoctoral Science Foundation [2017M623209, 2020M683678XB]
- Special Scientific Research Program of Shaanxi Provincial Education Department [17JK0495]
- Natural Science Basic Research Program of Shaanxi [2018JQ5080, 2018JM5009]
- Key Technology Project for Safe Production and Heavy Accident Prevention and Control [shanxi-0007-2017AQ]
- Key RAMP
- D Program of Shaanxi [2017ZDCXL-GY-01-02-03]
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A method for measuring the thermal effect of spontaneous combustion and the adiabatic spontaneous combustion period of coal was proposed. Through experiments, the adiabatic spontaneous combustion period for coal from the Zhao Xian coal mine was determined to be 95.9 hours, with a small error of less than 0.22%. This research contributes to evaluating the potential risks associated with spontaneous coal combustion.
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 com-bustion 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. (c) 2021 Elsevier Ltd. All rights reserved.
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