To study the effect of coal particle size on the activation energy of coal oxidation reaction in different oxidation stages, the experimental equipment of temperature-programmed tests was adopted. To determine the relationship between oxygen consumption rate and gas products, the temperature was explored in the low-temperature oxidation stage of coal samples with different particle sizes. The critical temperature point for coal samples of different particle sizes was obtained by analyzing the change rule of gas product and oxygen consumption rate with temperature, and dynamic analysis was carried out on this basis. Establishing an Arrhenius formula between the oxygen consumption rate and the coal temperature, the apparent activation energy equation was obtained from the logarithmic treatment method. The linear regression on straight line gradient of the equation was analyzed and the apparent activation energy for the low temperature oxidized coal sample was calculated. The results showed that the particle sizes affected the apparent activation energy, and the larger the particle size was, the larger the activation energy was. However, the coal samples with a particle size of 5–7 mm had the maximum apparent activation energy before the critical temperature. Compared with other particle sizes, the coal sample of this particle size did spontaneously combust easily.

International Seminar on Fire and Explosion Hazards (9; 2019; Saint Petersburg, Russia). Proceedings of the Ninth International Seminar on Fire and Explosion Hazards [Электронный ресурс]: 21-26 April 2019, Saint Petersburg, Russia. Vol. 2 / Peter the Great St. Petersburg Polytechnic University, Autonomous Non-Profit Organization "Fire and Explosion Safety", Gefest Holding Ltd ; [edited by A. Snegirev [et al.]. — Электрон. текстовые дан. (1 файл : 98,7 Мб). — Saint Petersburg, 2019. — Загл. с титул. экрана. — Свободный доступ из сети Интернет (чтение, печать, копирование). — Adobe Acrobat Reader 7.0. — <URL:http://elib.spbstu.ru/dl/2/k19-97.pdf>. — <URL:http://doi.org/10.18720/SPBPU/2/k19-97>.