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Substantiation into the efficiency of the coal gasification process with a focus on hydrogen production

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Category: Content №3 2025

Last Updated on 25 June 2025

Published on 30 November -0001

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Authors:

P.Saik*, orcid.org/0000-0001-7758-1083, Dnipro University of Technology, Dnipro, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

V.Lozynskyi, orcid.org/0000-0002-9657-0635, Dnipro University of Technology, Dnipro, Ukraine

D.Yankin, orcid.org/0009-0006-4731-1115, Dnipro University of Technology, Dnipro, Ukraine

N.Lysyy, orcid.org/0009-0006-7050-0395, Lviv State University of Life Safety, Lviv, Ukraine

O.Cherniaiev, orcid.org/0000-0001-8288-4011, Dnipro University of Technology, Dnipro, Ukraine

* Corresponding author e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

повний текст / full article

Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu. 2025, (3): 085 - 092

https://doi.org/10.33271/nvngu/2025-3/085

Abstract:

Purpose. Substantiation of the technological parameters of underground coal gasification based on the established dependence of the efficiency of the goaf formation on the variation in coal seam thickness, in order to determine rational and effective coal gasification modes with a focus on hydrogen production.

Methodology. A series of laboratory studies was conducted using a specially designed experimental setup, which made it possible to determine the influence of variable operating characteristics on the gasification process. The trapezoid method was applied to determine the parameters of the goaf of the underground gasifier based on the established geometric data obtained from the opening of laboratory gasifier models. The lower heating value of the producer gas was determined considering the thermodynamic probability of the main gasification reactions within the studied temperature range.

Findings. Current trends in the underground coal gasification technology development have been analysed with a focus on hydrogen production as the main energy product. The volumes of coal losses in the near-contour zones of an underground gasifier during gasification of thin seams have been determined. The operation duration parameters of an underground gasifier with the thickness of coal seams from 0.7 to 1.2 m and the lower producer gas combustion heat depending on the temperature regime have been substantiated.

Originality. The dependences of the change in the maximum width of the underground gasifier and the value of the expansion of the combustion face length on the coal seam thickness have been identified, which makes it possible to predict the area of the goaf and assess the level of coal losses in the near-contour zones. It has been found that the temperature increase in the reaction zone of the gasifier intensifies the processes of thermochemical conversion of carbon, which leads to an increase in the concentration of hydrogen (H₂) and carbon monoxide (CO) in the composition of synthesis gas, which increases its energy value and suitability for further use in hydrogen energy systems.

Practical value. The parameters of operational coal losses in the near-contour zones of an underground gasifier have been substantiated and the duration of the gasification process active phase has been determined. The obtained results make it possible to predict the optimal locations for drilling production wells in order to minimize coal losses in pillars between neighbouring gasifiers. In addition, these data can be used to estimate the volume of coal reserves to be gasified and to calculate the expected producer gas yield, which is key to the feasibility study of the process.

Keywords: underground coal gasification, producer gas, hydrogen, goaf

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