Liquid-phase axial mixing study in a mobile bed contactor with low density particles

Authors

  • O. P. Rama,

    1. Department of Chemical Engineering, Indian Institute of Technology Kanpur, Kanpur — 208016 India
    Current affiliation:
    1. Department of Chemical Engineering, H.B. Technological Institute, Kanpur
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  • D. P. Rao,

    1. Department of Chemical Engineering, Indian Institute of Technology Kanpur, Kanpur — 208016 India
    Current affiliation:
    1. Department of Chemical Engineering, Indian Institute of Technology Kanpur, Kanpur — 208016 India
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  • V. Subba Rao

    1. Department of Chemical Engineering, Indian Institute of Technology Kanpur, Kanpur — 208016 India
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Abstract

Axial mixing of the liquid phase in a 0.15 m ID mobile bed contactor has been studied for spherical, cork and irregular-shaped particles of densities 53, 183 and 112 kg m−3, respectively, using the air-water system. The range of gas and liquid flow rates covered were from 0.5 to 5 m s−1 and from 0.011 to 0.044 m s−1, respectively. The experimental breakthrough curves were interpreted by means of the axial dispersion model. Correlations for the Peclet number and axial dispersion coefficient have been proposed. The results indicate that near plug flow of the liquid phase could be achieved with higher static bed heights if the congregation of particles at the wall could be avoided.

Abstract

On a étudié le mélange axial de la phase liquide dans un contacteur à lit mobile de diamètre intérieur 0,15 m en présence de particules sphériques, en forme de bouchon ou de formes irrégulières de densités respectives de 53, 183 et 112 kg m 3 et pour le système air-eau. Les débits de gaz et de liquide enjeu ont varié respectivement de 0,5 à 5 m_l et de 0,011 à 0,044 m s-'. On a interprété les courbes expérimentales de réapparition au moyen du modèle de dispersion axiale. On a proposé des corrélations pour le nombre de Péclet et le coefficient de dispersion axiale. Les résultats indiquent qu'on pourrait réaliser, avec des hauteurs de lit statique plus élevées, un écoulement de la phase liquide voisin de l'écoulement piston, si l'on pouvait éviter l'aggrégation des particules à la paroi.

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