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Chemical Research in Chinese Universities ›› 2004, Vol. 20 ›› Issue (4): 478-482.

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Hydrodynamic Behavior in a Tapered Bubble Column

ZHANG Kai1,2,3, ZHAO Yu-long2, ZHANG Bi-jiang2   

  1. 1. State Key Lab of Heavy Oil Processing, Faculty of Chemical Science and Engineering, University of Petroleum, Beijing 102249, P. R. China;
    2. Institute of Coal Chemistry, Chinese Academy of Sciences, POBox 65, Taiyuan, P. R. China;
    3. Department of Chemical Engineering, University College London, London WC1E 7JE, UK
  • Received:2004-06-03 Online:2004-08-24 Published:2011-08-06

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Abstract: The experiment was conducted to explore the hydrodynamics in a conical column with a height of 3.00 m, and a taper angle of 1.91°.Three regimes occur in succession with increasing superficial gas velocity.Overall gas holdup increases with an increase in gas velocity and a decrease in solid concentration or static slurry height.Axial solid holdup becomes more uniform with increasing gas velocity, while axial gas holdup decreases from the bottom to the top.Both dry and wet pressure drops across the gas distributor increase with an increase in superficial gas velocity.

Key words: Tapered slurry bubble column, Flow regime transition, Overall gas holdup, Axial holdups profile, Distributor pressure drop