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Numerical Model to Analyze the Physicochemical Mechanisms Involved in CO 2 Absorption by an Aqueous Ammonia Droplet

Author

Listed:
  • M. I. Lamas Galdo

    (Escola Politécnica Superior, Universidade da Coruña, 15403 Ferrol, Spain)

  • J. D. Rodriguez García

    (Escola Universitaria Politécnica, Universidade da Coruña, 15405 Ferrol, Spain)

  • J. M. Rebollido Lorenzo

    (IES de Valga, 36645 Xanza, Pontevedra, Spain)

Abstract

CO 2 is the main anthropogenic greenhouse gas and its reduction plays a decisive role in reducing global climate change. As a CO 2 elimination method, the present work is based on chemical absorption using aqueous ammonia as solvent. A CFD (computational fluid dynamics) model was developed to study CO 2 capture in a single droplet. The objective was to identify the main mechanisms responsible for CO 2 absorption, such as diffusion, solubility, convection, chemical dissociation, and evaporation. The proposed CFD model takes into consideration the fluid motion inside and outside the droplet. It was found that diffusion prevails over convection, especially for small droplets. Chemical reactions increase the absorption by up to 472.7% in comparison with physical absorption alone, and evaporation reduces the absorption up to 41.9% for the parameters studied in the present work.

Suggested Citation

  • M. I. Lamas Galdo & J. D. Rodriguez García & J. M. Rebollido Lorenzo, 2021. "Numerical Model to Analyze the Physicochemical Mechanisms Involved in CO 2 Absorption by an Aqueous Ammonia Droplet," IJERPH, MDPI, vol. 18(8), pages 1-16, April.
    • Handle: RePEc:gam:jijerp:v:18:y:2021:i:8:p:4119-:d:535525
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    References listed on IDEAS

    as
    1. Chen, Wei-Hsin & Tsai, Ming-Hang & Hung, Chen-I, 2013. "Numerical prediction of CO2 capture process by a single droplet in alkaline spray," Applied Energy, Elsevier, vol. 109(C), pages 125-134.
    2. Choi, Munkyoung & Cho, Minki & Lee, J.W., 2016. "Empirical formula for the mass flux in chemical absorption of CO2 with ammonia droplets," Applied Energy, Elsevier, vol. 164(C), pages 1-9.
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