Abstract
The gas holdup characteristics of a continuous annular bubble column of coal were studied. Coalescence of bubbles occurred more readily in the slurry bubble column than in the air-water two-phase bubble column. The gas holdup eG decreased with increasing slurry flow rate and solid concentration. However, increase of eG with increasing solid concentration was found in a higher range of solid concentration. Considering such an effect related to solid concentration, an empirical correlation for the estimation of gas holdup was derived. The applicability of the previously reported correlations for the slurry bubble column was also studied.
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