Investigation of temperature and gas release in spontaneous fires at rock dumps
V.A. Portola1, S.I. Protasov2, E.A. Seregin2
1 T.F. Gorbachev Kuzbass State Technical University, Kemerovo, Russian Federation
2 KUZBASS NIIOGR Innovation Company, Kemerovo, Russian Federation
Russian Mining Industry №4 / 2024 p.140-145
Abstract: Losses of coal, allowed in the mining process, as well as the creation of conditions that promote the flow of air to the oxidizable combustible components, can result in self-ignition and spontaneous fires in coal and carbon-containing rock accumulations in places of mining operations and at the rock dumps. Spontaneous fires in underground mines are the most dangerous because people can be poisoned by toxic carbon oxidation products released into the mine air. Self-ignition foci can initiate explosions of the accomulated combustible gases and coal dust. Taking into account the danger of spontaneous fires for coal mines, extensive research on the process of coal self-ignition is underway. The article presents the results of measuring the temperature and concentration of emitted gases in a self-ignition focus, which developed inside the coal-bearing rocks at a dump. The temperature was measured in boreholes drilled to the depth of 2.5 meters. The boreholes were spaced 10 m apart. At the ambient air temperature of 0°C, the upper layer of the rocks above the self-ignition focus is heated from +5 to +14°C, which allows using thermal imaging cameras to detect the self-ignition foci. The studies showed a non-uniform heating of rocks, which can be explained by the different content of coal in the dump and different air inflow to the combustible components. Various patterns of increasing or vice versa decreasing temperature of the dump rocks up to the depth of 2.5 m were revealed, so the currently recommended methodology for detection and control the hazards of spontaneous fire at the rock dumps does not allow to determine the real dimensions of the focus. Hydrogen sulfide and sulfur dioxide were detected in some of the boreholes, which confirms that sulfur is involved in the process of waste dumps self-ignition. Carbon oxide was detected in almost all the boreholes, but no direct correlation between the rock temperature and the carbon oxide concentration has been detected.
Keywords: rock dump, coal-bearing rocks, spontaneous fire, self-ignition foci, temperature, gas emission, detection of selfignition, contact thermometer, borehole
For citation: Portola V.A., Protasov S.I., Seregin E.A. Investigation of temperature and gas release in spontaneous fires at rock dumps. Russian Mining Industry. 2024;(4):140–145. (In Russ.) https://doi.org/10.30686/1609-9192-2024-4-140-145
Article info
Received: 07.06.2024
Revised: 09.07.2024
Accepted: 16.07.2024
Information about the authors
Vyacheslav A. Portola – Dr. Sci. (Eng.), Professor, T.F. Gorbachev Kuzbass State Technical University, Kemerovo, Russian Federation; https://orcid.org/0000-0002-7920-1248; e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
Sergey I. Protasov – Cand. Sci. (Eng.), Director, KUZBASS NIIOGR Innovation Company, Kemerovo, Russian Federation; e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
Evgeny A. Seregin – Chief Engineer, KUZBASS NIIOGR Innovation Company, Kemerovo, Russian Federation; e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
References
1. Скочинский А.А., Огиевский В.М. Рудничные пожары. М.: Горное дело; Киммерийский центр; 2011. 375 с.
2. Timofeeva S.S., Lugovtsova N.Yu., Yankova P, Timofeev S S Assessing the unaccounted environmental pressure caused by endogenous fires on the rock dumps of Kuzbass Overburden Rocks. IOP Conference Series: Earth and Environmental Science. 2019;224:012057. https://doi.org/10.1088/1755-1315/224/1/012057
3. Портола В.А., Жданов А.Н., Бобровникова А.А. Анализ условий, способствующих развитию процесса самовозгорания в штабелях угля. Горный информационно-аналитический бюллетень. 2022;(6-1):187–197. https://doi.org/10.25018/0236_1493_2022_61_0_187 Portola V.A., Zhdanov A.N., Bobrovnikova A.A. Analysis of the conditions facilitate to the development of the process of selfcarrierburning in coal stacks. Mining Informational and Analytical Bulletin. 2022;(6-1):187–197. (In Russ.) https://doi.org/1 0.25018/0236_1493_2022_61_0_187
4. Mohtaderi B., Dlugogorski B.Z., Kennedy E.M. Effects of wind flow on self-heating characteristics of coal stockpiles. Process Safety and Environmental Protection. 2000;78(6):445–453. https://doi.org/10.1205/095758200530998
5. Lin Q., Wang S., Liang Y., Song S., Ren T. Analytical prediction of coal spontaneous combustion tendency: Velocity range with high possibility of self-ignition. Fuel Processing Technology. 2017;159: 38–47. https://doi.org/10.1016/j.fuproc.2016.09.027
6. Ютяев Е.П., Портола В.А., Мешков А.А., Харитонов И.Л., Жданов А.Н. Развитие процесса самонагревания в скоплениях угля под действием молекулярной диффузии кислорода. Уголь. 2018;(10):42–46. https://doi.org/10.18796/0041-5790-201810-42-46 Yutyaev E.P., Portola V.A., Meshkov A.A., Kharitonov I.L., Zhdanov A.N. Development of self-heating process in coal stocks under molecular diffusion of oxygen. Ugol’. 2018;(10):42–46. (In Russ.) https://doi.org/10.18796/0041-5790-2018-10-42-46
7. Song S., Wang S., Jiang S., Liang Y., Hu P. Multifield coupled dynamic simulation of coal oxidation and self-heating in longwall coal mine gob. Mathematical Problems in Engineering. 2020;(1):075657. https://doi.org/10.1155/2020/9075657
8. Акбаров Т.Г., Исраилов М.А., Махмудов Д.Р. Изучение и предупреждение самовозгораемости углей Ангренского месторождения. Горный информационно-аналитический бюллетень. 2021;(1):170–177. https://doi.org/10.25018/0236-1493-2021-1-0-170-177 Akbarov T.G., Israilov M.A., Makhmudov D.R. Analysis and prevention of spontaneous combustion of Angren coal. Mining Informational and Analytical Bulletin. 2021;(1):170–177. (In Russ.) https://doi.org/10.25018/0236-1493-2021-1-0-170-177
9. Докучаева А.И. Особенности газообменных процессов при нагреве в углях, склонных к самовозгоранию. Маркшейдерия и недропользование. 2023;(2):56–61. https://doi.org/10.56195/20793332_2023_2_66_61 Dokuchaeva A.I. Features of gas exchange processes during heating in coals prone to spontaneous combustion. Mine Surveying and Subsurface Use. 2023;(2):56–61. (In Russ.) https://doi.org/10.56195/20793332_2023_2_66_61
10. Родионов В.А., Турсенев С.А., Скрипник И.Л., Ксенофонтов Ю.Г. Результаты исследования кинетических параметров самовозгорания каменноугольной пыли. Записки Горного института. 2020;246:617–622. https://doi.org/10.31897/PMI.2020.6.3 Rodionov V.A., Tursenev S.A., Skripnik I.L., Ksenofontov Y.G. Results of the study of kinetic parameters of spontaneous combustion of coal dust. Journal of Mining Institute. 2020;246:617–622. https://doi.org/10.31897/PMI.2020.6.3
11. Liang Y., Zhang J., Wang L., Luo H., Ren T. Forecasting spontaneous combustion of coal in underground coal mines by index gases: A review. Journal of Loss Prevention in the Process Industries. 2019;57:208–222. https://doi.org/10.1016/j.jlp.2018.12.003 12. Портола В.А., Бобровникова А.А., Син С.А., Игишев В.Г. Особенности выделения индикаторных пожарных газов при подаче азота в очаг самовозгорания угля. Безопасность труда в промышленности. 2022;(4):47–52. https://doi.org/10.24000/0409-2961-2022-4-47-52 Portola V.A., Bobrovnikova A.A., Sin S.A., Igishev V.G. Special features of the release of indicator fire gases at the nitrogen supply to the foci of coal spontaneous combustion. Occupational Safety in Industry. 2022;(4):47–52. (In Russ.) https://doi.org/10.24000/0409-2961-2022-4-47-52
13. Портола В.А., Серегин Е.А., Протасов С.И., Ярош А.С., Бобровникова А.А. Контроль теплового состояния породных отвалов и объектов открытых горных работ с использованием беспилотных летательных аппаратов. Вестник научного центра по безопасности работ в угольной промышленности. 2023;(4):84–90. Portola V.A., Seregin E.A., Protasov S.I., Yarosh A.S., Bobrovnikova A.A. Control of the thermal condition of rock dumps and open mining facilities using unpiloted aircraft vehicles. Bulletin of Research Center for Safety in Coal Industry (Industial Safety). 2023;(4):84–90. (In Russ.)
