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Title: Minimum liquid fluidization velocity in gas-liquid-solid fluidized beds

Abstract

Accurate detection of minimum liquid fluidization is essential to the successful operation of gas-liquid-solid fluidized beds, especially when particle or liquid properties evolve. A gas-liquid-solid system of 3-mm glass beads exhibits three distinct flow regimes as the liquid velocity is increased: compacted, agitated and fluidized-bed regimes. Measurements showed that the bed is not fluidized in the agitated bed regime. Pressure gradient and bed height measurements do not provide the minimum liquid fluidization velocity; instead, they offer the velocity between the compacted and agitated bed regimes. Time-averaged signals are not reliable for determining the minimum liquid fluidization velocity. It can be obtained from the standard deviation, the average frequency, the Hurst exponent and the V statistic of the cross-sectional average conductivity, which can be measured under many industrial conditions. Examples of applications of gas-liquid-solid fluidized bed reactors include coal liquefaction and petroleum hydrotreating.

Authors:
; ; ;  [1]
  1. Univ. of Western Ontario, London, Ontario (Canada). Dept. of Chemical and Biochemical Engineering
Publication Date:
Sponsoring Org.:
Natural Sciences and Engineering Research Council of Canada, Ottawa, ON (Canada)
OSTI Identifier:
506007
Resource Type:
Journal Article
Journal Name:
AIChE Journal
Additional Journal Information:
Journal Volume: 43; Journal Issue: 5; Other Information: PBD: May 1997
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; 02 PETROLEUM; FLUIDIZED BEDS; FLUID MECHANICS; CHEMICAL REACTORS; FLUIDIZATION; FLOW RATE; COAL LIQUEFACTION; PETROLEUM REFINERIES; MULTIPHASE FLOW

Citation Formats

Briens, L A, Briens, C L, Margaritis, A, and Hay, J. Minimum liquid fluidization velocity in gas-liquid-solid fluidized beds. United States: N. p., 1997. Web. doi:10.1002/aic.690430507.
Briens, L A, Briens, C L, Margaritis, A, & Hay, J. Minimum liquid fluidization velocity in gas-liquid-solid fluidized beds. United States. https://doi.org/10.1002/aic.690430507
Briens, L A, Briens, C L, Margaritis, A, and Hay, J. 1997. "Minimum liquid fluidization velocity in gas-liquid-solid fluidized beds". United States. https://doi.org/10.1002/aic.690430507.
@article{osti_506007,
title = {Minimum liquid fluidization velocity in gas-liquid-solid fluidized beds},
author = {Briens, L A and Briens, C L and Margaritis, A and Hay, J},
abstractNote = {Accurate detection of minimum liquid fluidization is essential to the successful operation of gas-liquid-solid fluidized beds, especially when particle or liquid properties evolve. A gas-liquid-solid system of 3-mm glass beads exhibits three distinct flow regimes as the liquid velocity is increased: compacted, agitated and fluidized-bed regimes. Measurements showed that the bed is not fluidized in the agitated bed regime. Pressure gradient and bed height measurements do not provide the minimum liquid fluidization velocity; instead, they offer the velocity between the compacted and agitated bed regimes. Time-averaged signals are not reliable for determining the minimum liquid fluidization velocity. It can be obtained from the standard deviation, the average frequency, the Hurst exponent and the V statistic of the cross-sectional average conductivity, which can be measured under many industrial conditions. Examples of applications of gas-liquid-solid fluidized bed reactors include coal liquefaction and petroleum hydrotreating.},
doi = {10.1002/aic.690430507},
url = {https://www.osti.gov/biblio/506007}, journal = {AIChE Journal},
number = 5,
volume = 43,
place = {United States},
year = {Thu May 01 00:00:00 EDT 1997},
month = {Thu May 01 00:00:00 EDT 1997}
}