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Large-scale Experimental Investigations to Evaluate the Feasibility of Producing Methane-Rich Gas (SNG) through Underground Coal Gasification Process. Effect of Coal Rank and Gasification Pressure

1
Główny Instytut Górnictwa (Central Mining Institute), 40-166 Katowice, Poland
2
Geoenvironmental Research Centre (GRC), School of Engineering, Cardiff University, Cardiff CF24 3AA, UK
*
Author to whom correspondence should be addressed.
Energies 2020, 13(6), 1334; https://doi.org/10.3390/en13061334
Received: 10 February 2020 / Revised: 5 March 2020 / Accepted: 10 March 2020 / Published: 13 March 2020
An experimental campaign on the methane-oriented underground coal gasification (UCG) process was carried out in a large-scale laboratory installation. Two different types of coal were used for the oxygen/steam blown experiments, i.e., “Six Feet” semi-anthracite (Wales) and “Wesoła” hard coal (Poland). Four multi-day gasification tests (96 h continuous processes) were conducted in artificially created coal seams under two distinct pressure regimes-20 and 40 bar. The experiments demonstrated that the methane yields are significantly dependent on both the properties of coal (coal rank) and the pressure regime. The average CH4 concentration for “Six Feet” semi-anthracite was 15.8%vol. at 20 bar and 19.1%vol. at 40 bar. During the gasification of “Wesoła” coal, the methane concentrations were 10.9%vol. and 14.8%vol. at 20 and 40 bar, respectively. The “Six Feet” coal gasification was characterized by much higher energy efficiency than gasification of the “Wesoła” coal and for both tested coals, the efficiency increased with gasification pressure. The maximum energy efficiency of 71.6% was obtained for “Six Feet” coal at 40 bar. A positive effect of the increase in gasification pressure on the stabilization of the quantitative parameters of UCG gas was demonstrated. View Full-Text
Keywords: underground coal gasification; UCG; methanation; methane; SNG underground coal gasification; UCG; methanation; methane; SNG
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MDPI and ACS Style

Kapusta, K.; Wiatowski, M.; Stańczyk, K.; Zagorščak, R.; Thomas, H.R. Large-scale Experimental Investigations to Evaluate the Feasibility of Producing Methane-Rich Gas (SNG) through Underground Coal Gasification Process. Effect of Coal Rank and Gasification Pressure. Energies 2020, 13, 1334. https://doi.org/10.3390/en13061334

AMA Style

Kapusta K, Wiatowski M, Stańczyk K, Zagorščak R, Thomas HR. Large-scale Experimental Investigations to Evaluate the Feasibility of Producing Methane-Rich Gas (SNG) through Underground Coal Gasification Process. Effect of Coal Rank and Gasification Pressure. Energies. 2020; 13(6):1334. https://doi.org/10.3390/en13061334

Chicago/Turabian Style

Kapusta, Krzysztof; Wiatowski, Marian; Stańczyk, Krzysztof; Zagorščak, Renato; Thomas, Hywel R. 2020. "Large-scale Experimental Investigations to Evaluate the Feasibility of Producing Methane-Rich Gas (SNG) through Underground Coal Gasification Process. Effect of Coal Rank and Gasification Pressure" Energies 13, no. 6: 1334. https://doi.org/10.3390/en13061334

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