Bed density and bubble void fraction variation in a fluidized bed stripper

•Beddensity, pressure fluctuation andbubble void fraction quantified for strippers.•Gratings gave higher bed density and allowed a wider range of operating conditions.•Onset of flooding was a sudden rather than gradual occurrence.•Increasing fines and addingholes to the disk and donut traysmitigated...

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Bibliographic Details
Published in:Chemical engineering science 2022-10, Vol.260, p.117837, Article 117837
Main Authors: Issangya, Allan S., Cocco, Ray A., Reddy Karri, S.B., Knowlton, Ted M., Wei Chew, Jia
Format: Article
Language:English
Subjects:
Bubbles
Disk and donut
FCC
Fluidized bed
Grating
Hydrodynamics
Stripper density
Void fraction
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Summary:•Beddensity, pressure fluctuation andbubble void fraction quantified for strippers.•Gratings gave higher bed density and allowed a wider range of operating conditions.•Onset of flooding was a sudden rather than gradual occurrence.•Increasing fines and addingholes to the disk and donut traysmitigatedflooding.•Radial bubble void fraction profiles were different between the two internal types. This study was targeted at understanding the local flow and flooding behaviors of fluidized bed strippers. Beddensity, pressure fluctuations andbubble void fraction were measured in a 0.6 m diameter stripper fordisk and donut, as well as gratinginternals using FCC catalyst particles.The gratingstripper had a higher bed density andoperatedsmoothly without flooding over a wider range of gas and solids flows than the disk and donut stripper. Flooding in thedisk and donut stripperwas a sudden rather than a gradual occurrence when a limiting solids flux was exceeded.Increasing fines composition and addingholes to the disk and donut traysmitigatedflooding to some extent.The gratings stripper had flattened parabolic radial bubble void fraction profiles whereas the disk and donut stripper had characteristic M-shape profiles. The results hereare expected to be valuable for the operation and design of gas-solids fluidized bed strippers.
ISSN:0009-2509
1873-4405
DOI:10.1016/j.ces.2022.117837