Spontaneous ignition of coal pile

Climatic peculiarities of Kuzbass govern nonuniform use of coal in the course of year, which necessitates coal piling on storage yards in summer. Coal being in permanent contact with air promotes spontaneous ignition of coal piles, which affects natural environment and people health due to harmful emissions, and leads to the useful mineral loss. For investigations of spontaneous ignition process, a coal pile was formed with a height of 4 m and volume of round 3000 t. Monitoring of coal pile temperature, gas emissions and chemical activity of coal relative to oxygen was carried out for four months. The measurements showed that the temperature of the pile and atmospheric air decreased for 45 days with simultaneous increase in the moisture content of coal. Later on, the coal temperatures grew with decreasing moisture content, and a temperature anomaly formed on the pile surface. The coal temperature in the center of the anomaly exceeded the ambient temperature by 25 deg. The further temperature reduction in the atmospheric air with snowfall contributed to cooling of air. Due to late piling, only the process of self-heating was recorded in coal. The kinetic constant of oxygen absorption by coal decreased in the period of observations.

Keywords: coal pile, spontaneous ignition process, temperature anomaly, spontaneous heating, kinetic constant of oxygen absorption, carbon oxide, gas emission, coal temperature, coal moisture content.
For citation:

Portola V.A., Zhdanov A. N., Bobrovnikova A.A. Spontaneous ignition of coal pile. MIAB. Mining Inf. Anal. Bull. 2020;(10):155-162. [In Russ]. DOI: 10.25018/0236-14932020-10-0-155-162.

Acknowledgements:
Issue number: 10
Year: 2020
Page number: 155-162
ISBN: 0236-1493
UDK: 622.822.222.622
DOI: 10.25018/0236-1493-2020-10-0-155-162
Article receipt date: 18.03.2020
Date of review receipt: 20.04.2020
Date of the editorial board′s decision on the article′s publishing: 20.09.2020
About authors:

V.A. Portola1, Dr. Sci. (Eng.), Professor, e-mail: portola2@yandex.ru,
A.N. Zhdanov, Deputy Head of Technical Department, SUEK-Kuzbass JSC, 652507, Leninsk-Kuznetskiy, Russia, e-mail: suek-kuzbass@suek.ru,
A.A. Bobrovnikova1, Cand. Sci. (Chem.), Assistant Professor,
1 T. Gorbachev Kuzbass State Technical University, 650000, Kemerovo, Russia.

 

For contacts:

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

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