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Mass transfer and reaction performance of the downer and its hydrodynamic explanation

Authors

  • Chuigang Fan,

    1. Multi-phase Reaction Laboratory, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 10080, China
    2. Graduate School of Chinese Academy of Sciences, Beijing 10049, China
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  • Xiaotao Bi,

    1. Fluidization Research Centre, University of British Columbia, Vancouver, BC, Canada
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  • Weigang Lin,

    1. Multi-phase Reaction Laboratory, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 10080, China
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  • Wenli Song

    Corresponding author
    1. Multi-phase Reaction Laboratory, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 10080, China
    • Multi-phase Reaction Laboratory, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 10080, China
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Abstract

Catalytic decomposition of ozone was carried out in a 15-m high, 90-mm inner diameter downer reactor. Radial distributions of ozone concentration at different axial elevations under different operating conditions were measured. The results were explained from the flow structure experimental data and corresponding signal analysis in time domain and frequency domain. The aggregation status of solid particles, relative movement between the gas and solids, and the dynamic behaviour of clusters were considered to have a joint influence on the mass transfer and reaction process in the downer.

Abstract

La décomposition catalytique d'ozone a été réalisée dans un réacteur à colonne descendante de 15 m de hauteur et 90 mm de diamètre intérieur. Les distributions radiales de la concentration d'ozone à différentes hauteurs, dans des conditions opératoires différentes, ont été mesurées. Les résultats sont expliqués à partir des données expérimentales de la structure d'écoulement et de l'analyse des signaux correspondants dans les domaines de temps et de fréquence. On considère que le statut d'agrégation des particules solides, le mouvement relatif entre le gaz et les solides ainsi que le comportement des agrégats ont une influence conjointe sur le transfert de matière et le procédé de réaction dans la colonne descendante.

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