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Effect of gas distributor on gas–liquid dispersion and mass transfer characteristics in stirred tank

Liu, Baoqing LU ; Xiao, Qing ; Sun, Ning ; Gao, Pengfei ; Fan, Fangyi and Sunden, Bengt LU (2019) In Chemical Engineering Research and Design 145. p.314-322
Abstract

Aiming at the fact that the function of gas distributor is often neglected in the case of high viscosity conditions, a novel spherical micro-orifice gas distributor was proposed and investigated experimentally in water system and non-Newtonian viscous system, respectively. The comparisons of gas–liquid dispersion and mass transfer performance between novel spherical micro-orifice gas distributor and traditional ring distributor were also done. Furthermore, the effects of gas distributors on the gas–liquid dispersion and mass transfer characteristics of three wide-viscosity-range impellers including LDB impeller, FZ impeller and MB impeller were also researched, and an impeller-distributor configuration with good gas–liquid dispersion... (More)

Aiming at the fact that the function of gas distributor is often neglected in the case of high viscosity conditions, a novel spherical micro-orifice gas distributor was proposed and investigated experimentally in water system and non-Newtonian viscous system, respectively. The comparisons of gas–liquid dispersion and mass transfer performance between novel spherical micro-orifice gas distributor and traditional ring distributor were also done. Furthermore, the effects of gas distributors on the gas–liquid dispersion and mass transfer characteristics of three wide-viscosity-range impellers including LDB impeller, FZ impeller and MB impeller were also researched, and an impeller-distributor configuration with good gas–liquid dispersion and mass transfer performance was achieved. The results show that, compared with ring gas distributor, the bubbles dispersed by novel spherical micro-orifice gas distributor are smaller, and the gas holdup and volumetric mass transfer coefficient are relatively higher under the same power consumption per unit volume. Meanwhile, the significant effect of gas distributor geometry on gas dispersion was found for high-viscosity liquid, but not relevant for low-viscosity batches. In addition, compared with other impeller-distributor configurations, the configuration consisting of FZ impeller and novel spherical micro-orifice gas distributor can achieve greater global gas holdup and higher oxygen mass transfer rate, which is recommended especially in viscous system with high gas flow rate. The research is beneficial to promote the application of novel spherical micro-orifice gas distributor in stirred tanks.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Gas distributor, Gas–liquid dispersion, Mass transfer, Wide-viscosity-range impellers
in
Chemical Engineering Research and Design
volume
145
pages
9 pages
publisher
IChemE
external identifiers
  • scopus:85063960884
ISSN
0263-8762
DOI
10.1016/j.cherd.2019.03.035
language
English
LU publication?
yes
id
dad0fb0d-e5d2-48ae-a577-7cf34508f32d
date added to LUP
2019-04-24 13:46:59
date last changed
2020-03-24 06:46:57
@article{dad0fb0d-e5d2-48ae-a577-7cf34508f32d,
  abstract     = {<p>Aiming at the fact that the function of gas distributor is often neglected in the case of high viscosity conditions, a novel spherical micro-orifice gas distributor was proposed and investigated experimentally in water system and non-Newtonian viscous system, respectively. The comparisons of gas–liquid dispersion and mass transfer performance between novel spherical micro-orifice gas distributor and traditional ring distributor were also done. Furthermore, the effects of gas distributors on the gas–liquid dispersion and mass transfer characteristics of three wide-viscosity-range impellers including LDB impeller, FZ impeller and MB impeller were also researched, and an impeller-distributor configuration with good gas–liquid dispersion and mass transfer performance was achieved. The results show that, compared with ring gas distributor, the bubbles dispersed by novel spherical micro-orifice gas distributor are smaller, and the gas holdup and volumetric mass transfer coefficient are relatively higher under the same power consumption per unit volume. Meanwhile, the significant effect of gas distributor geometry on gas dispersion was found for high-viscosity liquid, but not relevant for low-viscosity batches. In addition, compared with other impeller-distributor configurations, the configuration consisting of FZ impeller and novel spherical micro-orifice gas distributor can achieve greater global gas holdup and higher oxygen mass transfer rate, which is recommended especially in viscous system with high gas flow rate. The research is beneficial to promote the application of novel spherical micro-orifice gas distributor in stirred tanks.</p>},
  author       = {Liu, Baoqing and Xiao, Qing and Sun, Ning and Gao, Pengfei and Fan, Fangyi and Sunden, Bengt},
  issn         = {0263-8762},
  language     = {eng},
  pages        = {314--322},
  publisher    = {IChemE},
  series       = {Chemical Engineering Research and Design},
  title        = {Effect of gas distributor on gas–liquid dispersion and mass transfer characteristics in stirred tank},
  url          = {http://dx.doi.org/10.1016/j.cherd.2019.03.035},
  doi          = {10.1016/j.cherd.2019.03.035},
  volume       = {145},
  year         = {2019},
}