Flue Gas Desulphurization in Circulating Fluidized Beds

Yimin Deng, Renaud Ansart, Jan Baeyens and Huili Zhang
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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

Energies, 2019, vol. 12, issue 20, 1-19

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.

Keywords: SO 2 abatement; dry or semi-dry reaction; calcium oxide; model; efficiency (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (8)

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