Experimental study of transient thermal conditions in longwall faces
https://doi.org/10.17073/2500-0632-2022-1-37-48
Abstract
With limited mineral resources, existing mines are seeking to extract increasingly hard-to-reach and deep-seated mineral reserves. Increasing mining depth leads to problems connected with the provision of comfortable and safe working conditions. The main objective of creating favorable microclimate for miners is to provide acceptable values of air temperature in working areas at deep levels. Of particular interest are processes of formation of thermal conditions in longwall faces (longwalls), where high-performance hauling and mining equipment is used. We conducted a study to determine the formation of the thermal conditions in longwall faces. The study was based on experimental data obtained in the conditions of longwall face No. 1 of the first northern panel at the –440 m level of 4 RU mine of JSC “Belaruskali”. The findings of the experimental study of the dynamic microclimatic air parameters allowed us to establish that the thermal conditions in longwall faces were variable. This is due to the fact that during mining operations in longwall faces, the mining process cycle includes mining and maintenance shifts, characterized by different levels of heat release. The influence of thermal inertia of the equipment during shutdown for the maintenance shift plays an important role in the formation of thermal conditions. The findings of the experimental study of transient thermal modes in a longwall face during transition from mining shifts to maintenance shifts will form a basis for developing a mathematical model to calculate the heat exchange processes in mine workings (longwall faces). These will take into account the non-stationary nature of the technogenic heat release sources. The mathematical model will allow the safest and most effective technical and economic process solutions to be implemented, in order to control longwall face ventilation.
Keywords
mine ventilation,
longwall,
air supply,
experimental study,
thermal conditions,
mine microclimate heat release,
heat exchange,
air heating
Supporting agencies: The research was carried out with financial support of the Russian Science Foundation under the project No. 19-77-30008.
About the Authors
M. P. Perestoronin
Mining Institute of the Ural Branch of the Russian Academy of Sciences (MI UB RAS)
Russian Federation
Russian Federation
Maxim O. Perestoronin – Mining Engineer, Mining Thermal Physics Sector, Department of Aerology and Thermophysics
Perm
A. V. Zaitsev
Mining Institute of the Ural Branch of the Russian Academy of Sciences (MI UB RAS)
Russian Federation
Russian Federation
Artem V. Zaitsev – Dr. Sci. (Eng.), the Head of the Mining Thermal Physics Sector, Department of Aerology and Thermophysics
Scopus ID 57213120380
Perm
M. A. Semin
Mining Institute of the Ural Branch of the Russian Academy of Sciences (MI UB RAS)
Russian Federation
Russian Federation
Mikhail A. Semin – Cand. Sci. (Eng.), Researcher, Mining Thermal Physics Sector, Department of Aerology and Thermophysics
Scopus ID 56462570900, ResearcherID S-8980-2016
Perm
D. A. Borodavkin
Mining Institute of the Ural Branch of the Russian Academy of Sciences (MI UB RAS)
Russian Federation
Russian Federation
Dmitry A. Borodavkin – Mining Engineer, Sector “Mining Thermal Physics”, Department of Aerology and Thermophysics
Perm
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For citations:
Perestoronin M.P., Zaitsev A.V., Semin M.A., Borodavkin D.A. Experimental study of transient thermal conditions in longwall faces. Mining Science and Technology (Russia). 2022;7(1):37-48. https://doi.org/10.17073/2500-0632-2022-1-37-48
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