Performance of a hollow-fiber spiral disk for effective gas dispersion toward high mass transfer rate
- Univ. of Tokushima (Japan). Dept. of Chemical Science and Technology
- National Inst. for Resources and Environment, Tsukuba (Japan). Thermal Energy and Combustion Engineering Dept.
- Komatsu Ltd., Kanagawa (Japan). Research Div.
Gas-dispersive capability of a hollow-fiber membrane, manufactured specifically for the use in fine bubbles generation, is tested for attaining high gas-liquid mass transfer rate under low-gas-throughput, shallow-sparging (at depths < 0.7 m) conditions. The hollow fiber is wound in a plane spiral form, each of which can be piled in a cylindrical module. A bubble column is used in the presence as well as absence of a draft tube, which the module can fit to and serve as part of. To enhance the effectiveness in the module`s generating fine bubbles, electrolytes are added to the liquid phase, water. Over a superficial gas velocity range of 0.1--2 mm/s, the hollow-fiber module (in comparison to conventional perforated-plate distributors) demonstrates, even with moderate gas-supply pressures (< 0.3 MPa), as high as 3-fold and 20-fold increases in the volumetric mass transfer coefficient in the absence and presence of the electrolytes, respectively. The former has been attained with a negligible increase in the gas holdup; the latter has accompanied a large ({approximately} 20-fold) increase in the gas holdup. While in the latter case the bubbles are very finely dispersed, the draft-tube model of operation secures still reasonable liquid circulation with nonclustering, spherical bubbles uniformly dispersed in each of the core and annular regions of the bubble column.
- OSTI ID:
- 212215
- Journal Information:
- Industrial and Engineering Chemistry Research, Vol. 35, Issue 2; Other Information: PBD: Feb 1996
- Country of Publication:
- United States
- Language:
- English
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