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Flue Gas Desulphurization in Circulating Fluidized Beds

Author

Listed:
  • Yimin Deng

    (Laboratoire de Génie Chimique, Université de Toulouse, CNRS, INPT, UPS, 31432 Cedex 4 Toulouse, France)

  • Renaud Ansart

    (Laboratoire de Génie Chimique, Université de Toulouse, CNRS, INPT, UPS, 31432 Cedex 4 Toulouse, France)

  • Jan Baeyens

    (Beijing Advanced Innovation Centre of Soft Matter and Engineering, Beijing University of Chemical Technology, Beijing 100029, China)

  • Huili Zhang

    (School of Life Science and Technology, Beijing University of Chemical Technology, Beijing 100029, China)

Abstract

Sulphur dioxide (SO 2 ) is mostly emitted from coal-fueled power plants, from waste incineration, from sulphuric acid manufacturing, from clay brick plants and from treating nonferrous metals. The emission of SO 2 needs to be abated. Both wet scrubbing (absorption) and dry or semi-dry (reaction) systems are used. In the dry process, both bubbling and circulating fluidized beds (BFB, CFB) can be used as contactor. Experimental results demonstrate a SO 2 -removal efficiency in excess of 94% in a CFB application. A general model of the heterogeneous reaction is proposed, combining the external diffusion of SO 2 across the gas film, the internal diffusion of SO 2 in the porous particles and the reaction as such (irreversible, 1st order). For the reaction of SO 2 with a fine particulate reactant, the reaction rate constant and the relevant contact time are the dominant parameters. Application of the model equations reveals that the circulating fluidized bed is the most appropriate technique, where the high solid to gas ratio guarantees a high conversion in a short reaction time. For the CFB operation, the required gas contact time in a CFB at given superficial gas velocities and solids circulation rates will determine the SO 2 removal rate.

Suggested Citation

  • Yimin Deng & Renaud Ansart & Jan Baeyens & Huili Zhang, 2019. "Flue Gas Desulphurization in Circulating Fluidized Beds," Energies, MDPI, vol. 12(20), pages 1-19, October.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:20:p:3908-:d:276876
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    References listed on IDEAS

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    5. Kalisz, Sylwester & Wejkowski, Robert & Maj, Izabella & Garbacz, Przemysław, 2023. "A novel approach to the dry desulfurization process by means of sodium bicarbonate: A full-scale study on SO2 emission and geochemistry of fly ash," Energy, Elsevier, vol. 279(C).
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