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Effect of Coal Rank on Various Fluid Saturations Creating Mechanical Property Alterations Using Australian Coals

Author

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  • Mandadige Samintha Anne Perera

    (Deep Earth Energy Laboratory, Department of Civil Engineering, Monash University, Building 60, Melbourne, Victoria 3800, Australia)

  • Ashani Savinda Ranathunga

    (Deep Earth Energy Laboratory, Department of Civil Engineering, Monash University, Building 60, Melbourne, Victoria 3800, Australia)

  • Pathegama Gamage Ranjith

    (Deep Earth Energy Laboratory, Department of Civil Engineering, Monash University, Building 60, Melbourne, Victoria 3800, Australia)

Abstract

During CO 2 sequestration in deep coal seams, the coal mass may be subjected to various fluid (CO 2 , N 2 , etc. ) saturations. Therefore, in order to maintain the long-term integrity of the process, it is necessary to identify the mechanical responses of preferable coal seams for various fluid saturations. To date, many studies have focused on the CO 2 saturation effect on coal mass strength and less consideration has been given to the influence of other saturation mediums. Hence, this study aims to investigate coal’s mechanical responses to water and N 2 saturations compared to CO 2 saturation and to determine the effect of coal-rank. A series of unconfined compressive strength (UCS) tests was conducted on Australian brown and black coal samples saturated with water and N 2 at various saturation pressures. An advanced acoustic emission (AE) system was utilized to identify the changes in crack propagation behaviors under each condition. According to the results, both CO 2 and water act similarly with coal by enhancing the ductile properties of the coal mass and this mechanical weakening is greater for high-rank coal. Conversely, N 2 saturation slightly enhances coal strength and delays crack propagation in coal and this strength enhancement can be improved by increasing the N 2 saturation pressure.

Suggested Citation

  • Mandadige Samintha Anne Perera & Ashani Savinda Ranathunga & Pathegama Gamage Ranjith, 2016. "Effect of Coal Rank on Various Fluid Saturations Creating Mechanical Property Alterations Using Australian Coals," Energies, MDPI, vol. 9(6), pages 1-15, June.
    • Handle: RePEc:gam:jeners:v:9:y:2016:i:6:p:440-:d:71677
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    References listed on IDEAS

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    2. Perera, M.S.A. & Ranjith, P.G. & Choi, S.K. & Airey, D., 2011. "The effects of sub-critical and super-critical carbon dioxide adsorption-induced coal matrix swelling on the permeability of naturally fractured black coal," Energy, Elsevier, vol. 36(11), pages 6442-6450.
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    4. Perera, M.S.A. & Ranjith, P.G. & Viete, D.R., 2013. "Effects of gaseous and super-critical carbon dioxide saturation on the mechanical properties of bituminous coal from the Southern Sydney Basin," Applied Energy, Elsevier, vol. 110(C), pages 73-81.
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    Cited by:

    1. Isaka, B.L. Avanthi & Ranjith, P.G. & Rathnaweera, T.D. & Perera, M.S.A. & Kumari, W.G.P., 2019. "Influence of long-term operation of supercritical carbon dioxide based enhanced geothermal system on mineralogical and microstructurally-induced mechanical alteration of surrounding rock mass," Renewable Energy, Elsevier, vol. 136(C), pages 428-441.
    2. Xiaogang Zhang & Ranjith Pathegama Gamage & Mandadige Samintha Anne Perera & Ashani Savinda Ranathunga, 2018. "Effects of Water and Brine Saturation on Mechanical Property Alterations of Brown Coal," Energies, MDPI, vol. 11(5), pages 1-17, May.

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