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Integrated adsorption and absorption process for post-combustion CO2 capture

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Abstract

This study explored the feasibility of integrating an adsorption and solvent scrubbing process for post-combustion CO2 capture from a coal-fired power plant. This integrated process has two stages: the first is a vacuum swing adsorption (VSA) process using activated carbon as the adsorbent, and the second stage is a solvent scrubber/stripper system using monoethanolamine (30 wt-%) as the solvent. The results showed that the adsorption process could enrich CO2 in the flue gas from 12 to 50 mol-% with a CO2 recovery of > 90%, and the concentrated CO2 stream fed to the solvent scrubber had a significantly lower volumetric flowrate. The increased CO2 concentration and reduced feed flow to the absorption section resulted in significant reduction in the diameter of the solvent absorber, bringing the size of the absorber from uneconomically large to readily achievable domain. In addition, the VSA process could also remove most of the oxygen initially existed in the feed gas, alleviating the downstream corrosion and degradation problems in the absorption section. The findings in this work will reduce the technical risks associated with the state-of-the art solvent absorption technology for CO2 capture and thus accelerate the deployment of such technologies to reduce carbon emissions.

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Acknowledgements

The authors wish to acknowledge financial assistance provided to the CO2CRC by the Australian Government through its CRC program and through Australian National Low Emissions Coal Research and Development (ANLEC R&D). ANLEC R&D is supported by Australian Coal Association Low Emissions Technology Limited and the Australian Government through the Clean Energy Initiative.

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Authors and Affiliations

  1. Department of Chemical Engineering, The University of Western Australia, Perth, WA, 6009, Australia

    Gongkui Xiao

  2. Department of Chemical Engineering, University of Melbourne, Parkville, Victoria, 3010, Australia

    Penny Xiao & Paul Webley

  3. Department of Chemical Engineering, Monash University, Clayton, Victoria, 3800, Australia

    Andrew Hoadley

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  1. Gongkui Xiao
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  2. Penny Xiao
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  4. Paul Webley
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Correspondence to Gongkui Xiao.

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Xiao, G., Xiao, P., Hoadley, A. et al. Integrated adsorption and absorption process for post-combustion CO2 capture. Front. Chem. Sci. Eng. 15, 483–492 (2021). https://doi.org/10.1007/s11705-020-1964-3

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  • DOI: https://doi.org/10.1007/s11705-020-1964-3

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