Minieiev S., Prusova A., Yanzhula O., Minieiev O. The influence of great depths on the conditions activating desorption of adsorbed methane generated in a virgin coal seam

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Parent Category: Geo-Technical Mechanics, 2024
Category: Geo-Technical Mechanics, 2024, Issue 170

Geoteh. meh. 2024, 170, 5-16

 

THE INFLUENCE OF GREAT DEPTHS ON THE CONDITIONS ACTIVATING DESORPTION OF ADSORBED METHANE GENERATED IN A VIRGIN COAL SEAM

1Minieiev S. 1Prusova A. 2Yanzhula O. 3Minieiev O. 

1M.S. Poliakov Institute of Geotechnical Mechanics of the National Academy of Sciences of Ukraine
2Technical Development and Investments of the Coal Deportation of Metinvest Holding
3Dnipro University of Technology

 

UDC 622.411.322 553.15:533.587

Language: English

Abstract. It is generally accepted that when a coal seam is in a virgin rock massif for millions of years under the influence of rock pressure, its state is characterized by the absence of any physical processes in it.

In this article, it is stated that in reality, in these conditions relaxation processes can occur. These processes are caused by conformational rearrangements in the coal microstructure. They, in turn, create conditions for breaking the sorption equilibrium of adsorbed methane in coal due to the distance of methane molecules from the microstructure of the coal medium when the interlayer distances in the graphite-like layers of the coal seam expand.

The parameters are established, which determine the duration of the coal molecular structure relaxation, characterize ability of the structure to deform and the conditions under which the most significant changes occur. It is shown that the main parameters which affect the activation of desorption of adsorbed methane in a virgin coal seam are the energy of conformational rearrangements activation, the temperature of the seam and the interlayer distance in the graphite-like layers.

As a result of the research, it was found that with increase in the depth of the virgin coal seam, relaxation processes in it occur faster. These processes are caused by conformational rearrangements in the coal microstructure. They, in turn, create conditions for breaking the sorption equilibrium of adsorbed methane in coal due to the distance of methane molecules from the microstructure of the coal medium when the interlayer distances in the graphite-like layers of the coal seam expand.

The novelty of this research is in the establishment of the fact that with an increase in the depth of the virgin coal seam, all physical and mechanical processes associated with changes in the molecular structure of coal occur faster. At the same time, the energy of activation of these processes realization is less, including the energy of activation of adsorbed methane desorption. That is, the great depths of the coal seam accelerate and contribute to the physical processes that lead to the activation of the desorption of adsorbed methane.

Keywords: adsorbed methane, coal seam microstructure, activation energy, conformational rearrangements, graphite-like layers, interlayer distances, diffusion.

 

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About the authors:

Minieiev Serhii, Doctor of Technical Sciences (D.Sc.), Professor, Head of Department of Pressure Dynamics Control in Rocks, M.S. Poliakov Institute of Geotechnical Mechanics of the National Academy of Sciences of Ukraine (IGTM of the NAS of Ukraine), Dnipro, Ukraine,   This email address is being protected from spambots. You need JavaScript enabled to view it. , ORCID 0000-0002-4594-0915

Prusova Alla, Candidate of Technical Sciences (Ph.D.), Senior Researcher, M.S. Poliakov Institute of Geotechnical Mechanics of the National Academy of Sciences of Ukraine (IGTM of the NAS of Ukraine), Dnipro, Ukraine.

Yanzhula Oleksii, Candidate of Technical Sciences, Director of the Directorate for Technical Development and Investments of the Coal Deportation of Metinvest Holding, Dnipro, Ukraine, ORCID 0009-0000-8906-0656

 Minieiev Oleksandr, Candidate of Technical Sciences (Ph.D.), Associate Professor of Dnipro University of Technology of MES of Ukraine, Dnipro, Ukraine, ORCID 0009-0002-2570-594X