As one of disasters commonly seen in mine fire, coal spontaneous combustion can cause tremendous hazards. With the support of research outcomes in recent years, there are still numerous challenges in carrying out safe and effective mining activities. This paper tests the adiabatic spontaneous combustion time of coal based on temperature rise leading methods, bringing a new method to explore exothermic intensity measurement in coal spontaneous combustion. It also conducts quantitative tests to heat flow and heat release under coal spontaneous combustion in low temperature phase, and obtains a limit temperature difference of coal spontaneous combustion through simulation experiment. In the temperature rise experiment based on isothermal difference leading method, combustion times under different leading conditions have been tested. After fitting the combustion times with MATLAB software, the calculated adiabatic spontaneous combustion time of coal of 19.3 days is achieved. Finally, the shortest combustion time of coal samples under corresponding conditions is calculated based on the results of exothermic intensity under coal spontaneous combustion experiment. Compared with those of adiabatic spontaneous combustion time of coal based on isothermal difference leading method, the value of the shortest combustion time is bigger, meeting the expectations. The research method of isothermal difference leading coal sample temperature rise brings a new way to study the combustion time and exothermic intensity under coal spontaneous combustion coal spontaneous combustion, which is of great scientific and practical significance.
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