Research on Spontaneous Combustion Tendency of Bituminous Coals in Different Metamorphic Grades Based on Activation Energy Index
ZHANG Xinhai
BAI Ya e
LI Qingwei
MA Teng
Abstract：In this paper, four kinds of bituminous coal with different metamorphic grades were selected for studying the spontaneous combustion tendency of different coals which was determinate by the activation energy index. Through the programmed temperature rise experiment and by using the calculation formula, the oxygen consumption rate of different coal samples at different temperatures was obtained and then the apparent activation energy of coal samples was calculated according to chemical reaction kinetics theory. The results showed that when the spontaneous combustion tendency of coals was characteristics of the apparent activation energy, if the other conditions were the same and the change of the pre-exponential factor of the coals with different metamorphic was smaller, the higher the metamorphic grade of coals, the greater the apparent activation energy and the more nonflammable the coals; if the change of the pre-exponential factor of coals with different metamorphic grades was larger, it need to use the pre-exponential factor and apparent activation energy of coals to comprehensively judge their spontaneous combustion tendency. The larger the pre-exponential factor and the smaller the apparent activation energy of coal, the easier the spontaneous combustion of coals; on the contrary, the smaller the pre-exponential factor and the larger the apparent activation energy, the more difficult the spontaneous combustion of coals.
Keywords：bituminous coalactivation energyspontaneous combustion tendencymetamorphic gradeoxygen consumption rate
Publication Date：2016-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：4( 5-7,11 )