Analysis of the conditions facilitate to the development of the process of self-carrier-burning in coal stacks

Long-term storage of coal in coal piles increases the risk of spontaneous combustion due to the air oxidation of combustible components. The сoal stored in coal stacks is exposed to various environmental factors that can both slow down and accelerate the process of spontaneous combustion. Temperature and humidity of the air, speed and direction of air flows, precipitation influence the formation of fire seats to the greatest extent. The calculations have shown that the influence of the wind creates zones with increased gas pressure on the coal stack surface. The excess gas pressure can reach 100—200 Pa and depends on the wind speed, its density, the slope angle of the stack sides and the angle between the wind velocity vector and the tangent to the side surface. Laboratory experiments have shown that the permeability coefficient of a coal accumulation is 3.56 ∙ 10—9 m2, and the permeability can be decreased by
1.25 times by moistening the coal accumulation. The largest amount of air entering the coal stack is filtered along the side surface to the horizontal surface. The maximum air velocity in the accumulation is observed along the outline of the stack horizontal location. Considering that spontaneous combustion needs an intensive air inflow, the formation of a fire seat will occur on the stack sides or on its horizontal surface, at a slight distance from the stack side.

Portola V. A., Zhdanov A. N., Bobrovnikova A. A. Analysis of the conditions facilitate to the development of the process of self-carrier-burning in coal stacks. MIAB. Mining Inf. Anal. Bull. 2022;(6—1):187—197. [In Russ]. DOI: 10.25018/0236_1493_2022_61_0_187.

The study was supported by the Russian Science Foundation grant № 22— 27—20004, https://rscf.ru/project/22—27—20004/

Portola V. A., Dr. Sci. (Eng.), Professor, Professor of the Department of Aerology, Labor and Nature Protection, T. F. Gorbachev Kuzbass State Technical University, 650000, Kemerovo, 28 Vesennya St., Russia, e-mail: portola2@yandex.ru, ORCID ID: 0000-00027920-1248
Zhdanov Aleksandr Nikolaevich, deputy chief engineer (technology) — chief technologist SUEK-Kuzbass JSC Mining department of A. D. Rubana, 652507, Leninsk-Kuzneckij, 1 Shilina St, Russia, e-mail: ZhdanovAN@suek.ru, ORCID ID: 0000-0003-2142-6337
Bobrovnikova Alena Aleksandrovna, Dr. Sci. (Chem.), Associate Professor, theHead of the Department of Mineral Processing, T. F. Gorbachev Kuzbass State Technical University, 650000, Kemerovo, 28 Vesennya St., Russia, e-mail: baa.htnv@kuzstu.ru, ORCID ID: 0000-0002-6916-3831.

Portola V. A., e-mail: portola2@yandex.ru.

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