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Effect of Lignite Properties on Its Suitability for the Implementation of Underground Coal Gasification (UCG) in Selected Deposits

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  • Krzysztof Kapusta

    (Central Mining Institute, Plac Gwarków 1, 40-166 Katowice, Poland)

Abstract

Two experimental simulations of underground coal gasification (UCG) processes, using large bulk samples of lignites, were conducted in a surface laboratory setup. Two different lignite samples were used for the oxygen-blown experiments, i.e., “Velenje” meta-lignite (Slovenia) and “Oltenia” ortho-lignite (Romania). The average moisture content of the samples was 31.6wt.% and 45.6wt.% for the Velenje and Oltenia samples, respectively. The main aim of the study was to assess the suitability of the tested lignites for the underground coal gasification process. The gas composition and its production rates, as well as the temperatures in the artificial seams, were continuously monitored during the experiments. The average calorific value of gas produced during the Velenje lignite experiment (6.4 MJ/Nm 3 ) was much higher compared to the result obtained for the experiment with Oltenia lignite (4.8 MJ/Nm 3 ). The Velenje lignite test was also characterized by significantly higher energy efficiency, i.e., 44.6%, compared to the gasification of Oltenia lignite (33.4%). The gasification experiments carried out showed that the physicochemical properties of the lignite used considerably affect the in situ gasification process. Research also indicates that UCG can be considered as a viable option for the extraction of lignite deposits; however, lignites with a lower moisture content and higher energy density are preferred, due to their much higher process efficiency.

Suggested Citation

  • Krzysztof Kapusta, 2021. "Effect of Lignite Properties on Its Suitability for the Implementation of Underground Coal Gasification (UCG) in Selected Deposits," Energies, MDPI, vol. 14(18), pages 1-11, September.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:18:p:5816-:d:635374
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    References listed on IDEAS

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    1. Laciak, Marek & Kostúr, Karol & Durdán, Milan & Kačur, Ján & Flegner, Patrik, 2016. "The analysis of the underground coal gasification in experimental equipment," Energy, Elsevier, vol. 114(C), pages 332-343.
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    1. Jacek Nowak & Magdalena Kokowska-Pawłowska & Joanna Komorek & Marian Wiatowski & Krzysztof Kapusta & Zdzisław Adamczyk, 2022. "Optical Properties of Coal after Ex-Situ Experimental Simulation of Underground Gasification at Pressures of 10 and 40 bar," Energies, MDPI, vol. 15(23), pages 1-19, November.
    2. Ján Kačur & Marek Laciak & Milan Durdán & Patrik Flegner, 2023. "Investigation of Underground Coal Gasification in Laboratory Conditions: A Review of Recent Research," Energies, MDPI, vol. 16(17), pages 1-55, August.
    3. Zhen Dong & Haiyang Yi & Yufeng Zhao & Xinggang Wang & Tingxiang Chu & Junjie Xue & Hanqi Wu & Shanshan Chen & Mengyuan Zhang & Hao Chen, 2022. "Investigation of the Evolution of Stratum Fracture during the Cavity Expansion of Underground Coal Gasification," Energies, MDPI, vol. 15(19), pages 1-15, October.
    4. Marek Laciak & Ján Kačur & Milan Durdán, 2022. "Modeling and Control of Energy Conversion during Underground Coal Gasification Process," Energies, MDPI, vol. 15(7), pages 1-6, March.
    5. Jacek Borgulat & Katarzyna Ponikiewska & Łukasz Jałowiecki & Aleksandra Strugała-Wilczek & Grażyna Płaza, 2022. "Are Wetlands as an Integrated Bioremediation System Applicable for the Treatment of Wastewater from Underground Coal Gasification Processes?," Energies, MDPI, vol. 15(12), pages 1-19, June.
    6. Athanasios Lampropoulos & Vassilios D. Binas & Leila Zouridi & Costas Athanasiou & Miguel A. Montes-Morán & J. Angel Menéndez & Michalis Konsolakis & George E. Marnellos, 2022. "CO 2 Gasification Reactivity and Syngas Production of Greek Lignite Coal and Ex-Situ Produced Chars under Non-Isothermal and Isothermal Conditions: Structure-Performance Relationships," Energies, MDPI, vol. 15(3), pages 1-19, January.

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