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Flue Gas Desulphurization in Circulating Fluidized Beds

Deng, Yimin and Ansart, Renaud and Baeyens, Jan and Huili, Zhang Flue Gas Desulphurization in Circulating Fluidized Beds. (2019) Energies, 12 (20). 1-19. ISSN 1996-1073

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Official URL: https://doi.org/10.3390/en12203908

Abstract

Sulphur dioxide (SO2) 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 SO2 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 SO2‐removal efficiency in excess of 94% in a CFB application. A general model of the heterogeneous reaction is proposed, combining the external diffusion of SO2 across the gas film, the internal diffusion of SO2 in the porous particles and the reaction as such (irreversible, 1st order). For the reaction of SO2 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 SO2 removal rate.

Item Type:Article
HAL Id:hal-02339692
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
Other partners > Beijing University of Technology - BJUT (CHINA)
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Deposited On:30 Oct 2019 14:09

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