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Effect of Geometrical Parameters of Draft Tubes and Clear Liquid Height on Gas Holdup in a Bubble Column for Gas Dispersion into Tubes

Fukuji Yamashita^†

Dept. of Applied Chemistry, Kanagawa Institute of Technology, Atsugi, Japan

Korean Journal of Chemical Engineering, November 1999, 16(6), 789-794(6), 10.1007/BF02698353

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Abstract

The effects of the geometrical parameters of draft tubes and the clear liquid height on the average gas holdup E-G in a 0.16 m I.D. bubble column for gas dispersion into the tubes were experimentally studied in an air-tap water system. The gas holdup depended on the superficial gas velocity U-G, the kinds of gas spargers, the diameter and length of the draft tubes, clearance C-b between the lower end of the draft tube and the bottom of the bubble column, and the clear liquid height H-L. E-G increased with decreasing hole diameter of the gas sparger at a small gas velocity U-G, but did not depend on the kinds of gas spargers at a large U-G. E-G decreased with increasing clear liquid height H-L. The effect of H-L on E-G was well expressed by the modified three-region model. The experimental data of E-G were correlated.

Keywords

Bubble Column Air Lift Draft Tube Gas Holdup Liquid Height

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