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Experimental investigation on solid suspension performance of coaxial mixer in viscous and high solid loading systems

Xu, Zilong ; Jin, Zhijiang ; Liu, Baoqing LU and Sundén, Bengt LU (2019) In Chemical Engineering Science 208.
Abstract

The coaxial mixers consisting of an inner Rushton turbine or propeller and an outer anchor were combined first with the just off-bottom suspension in viscous and high solid loading systems. In this study, a new method based on RGB brightness analysis was proposed to determine the cloud height, and the measures to promote cloud height were also discussed. In addition, the effects of rotation modes, pumping modes and solid loading on the just-suspension power were investigated. The results showed that the co-rotation coaxial mixers with an up-pumping inner impeller could achieve the just suspension at lower power consumption and were recommended. The combination of anchor and up-pumping propeller was the most energy efficient among the... (More)

The coaxial mixers consisting of an inner Rushton turbine or propeller and an outer anchor were combined first with the just off-bottom suspension in viscous and high solid loading systems. In this study, a new method based on RGB brightness analysis was proposed to determine the cloud height, and the measures to promote cloud height were also discussed. In addition, the effects of rotation modes, pumping modes and solid loading on the just-suspension power were investigated. The results showed that the co-rotation coaxial mixers with an up-pumping inner impeller could achieve the just suspension at lower power consumption and were recommended. The combination of anchor and up-pumping propeller was the most energy efficient among the investigated mixers, whereas its cloud height was relatively low. The high off-bottom clearance and the combined inner impeller could promote the cloud height with little power variation, but the enlargement of inner impeller had no obvious effect.

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author
; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Cloud height, Coaxial mixer, High solid loading, Solid suspension
in
Chemical Engineering Science
volume
208
article number
115144
publisher
Elsevier
external identifiers
  • scopus:85070188000
ISSN
0009-2509
DOI
10.1016/j.ces.2019.08.002
language
English
LU publication?
yes
id
1bc4b9c5-ee5b-4a5c-96b9-e19152064730
date added to LUP
2019-08-29 12:15:15
date last changed
2020-01-21 12:56:26
@article{1bc4b9c5-ee5b-4a5c-96b9-e19152064730,
  abstract     = {<p>The coaxial mixers consisting of an inner Rushton turbine or propeller and an outer anchor were combined first with the just off-bottom suspension in viscous and high solid loading systems. In this study, a new method based on RGB brightness analysis was proposed to determine the cloud height, and the measures to promote cloud height were also discussed. In addition, the effects of rotation modes, pumping modes and solid loading on the just-suspension power were investigated. The results showed that the co-rotation coaxial mixers with an up-pumping inner impeller could achieve the just suspension at lower power consumption and were recommended. The combination of anchor and up-pumping propeller was the most energy efficient among the investigated mixers, whereas its cloud height was relatively low. The high off-bottom clearance and the combined inner impeller could promote the cloud height with little power variation, but the enlargement of inner impeller had no obvious effect.</p>},
  author       = {Xu, Zilong and Jin, Zhijiang and Liu, Baoqing and Sundén, Bengt},
  issn         = {0009-2509},
  language     = {eng},
  publisher    = {Elsevier},
  series       = {Chemical Engineering Science},
  title        = {Experimental investigation on solid suspension performance of coaxial mixer in viscous and high solid loading systems},
  url          = {http://dx.doi.org/10.1016/j.ces.2019.08.002},
  doi          = {10.1016/j.ces.2019.08.002},
  volume       = {208},
  year         = {2019},
}