Quality of Mixedness Profiles Based on Spatial Distribution of Local Mass Transfer Coefficients in a Bubble Column

Authors

  • Stoyan Nedeltchev,

    Corresponding author
    1. Department of Chemical Engineering, Graduate School of Science and Engineering, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8552, Japan
    • Department of Chemical Engineering, Graduate School of Science and Engineering, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8552, Japan
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  • Shinichi Ookawara,

    1. Department of Chemical Engineering, Graduate School of Science and Engineering, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8552, Japan
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  • Kohei Ogawa

    1. Department of Chemical Engineering, Graduate School of Science and Engineering, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8552, Japan
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Abstract

Local kLa measurements were performed during physical absorption of carbon dioxide into deionized water in a 0.289 m diameter bubble column equipped with a perforated plate gas distributor (31 holes × ø 0.002 m, free plate area 0.15 %). Three superficial gas velocities (ug) were examined (0.018, 0.031 and 0.038 m/s) under clear liquid height of 0.56 m. The spatial kLa distributions were treated by the quality of mixedness (QM) algorithm. It was found that at the regime transition velocity (Utrans = 0.034 m/s) to churn-turbulent flow regime both lower and upper column zones are characterized with the same QM indices.

Abstract

Des mesures locales de kLa ont été effectuées lors de l'absorption physique du dioxyde de carbone dans de l'eau déionisée dans une colonne à bulles de 0,289 m de diamètre munie d'un distributeur de gaz à plateau perforé (31 trous × Ø 0,002 m, zone de plateau libre de 0,15 %). Trois vitesses de gaz superficielles (ug) ont été examinées (0,018, 0,031 et 0,038 m/s) avec une hauteur de liquide clair de 0,56 m. Les distributions spatiales de kLa ont été traitées par l'algorithme de qualité de mélange (QM). On a trouvé qu'à la vitesse de transition du régime (Utrans = 0,034 m/s) en régime d'écoulement agité-turbulent, les zones inférieure et supérieure de la colonne sont caractérisées par les mêmes indices QM.

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