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Gas‐solids flow structures in a novel circulating‐turbulent fluidized bed
Author(s) -
Zhu Haiyan,
Zhu Jesse
Publication year - 2008
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.11432
Subject(s) - fluidization , turbulence , volume (thermodynamics) , mechanics , fluidized bed , chemistry , flux (metallurgy) , particle (ecology) , flow (mathematics) , fluidized bed combustion , thermodynamics , mixing (physics) , materials science , physics , geology , oceanography , organic chemistry , quantum mechanics
In this article a novel circulating‐turbulent fluidized bed (C‐TFB) featured by high solids holdup and high gross solids circulation has been introduced and tested. The purpose of the new design was to integrate conventional circulating and turbulent fluidized beds into a unique high‐density fluidization system for more efficient gas‐solid contact and significantly reduced solids backmixing. The hydrodynamic characteristics of the C‐TFB were analyzed in terms of differential pressure, solids concentration, particle velocity, and local solids flux distributions. An axial homogeneous flow structure was easily obtained with cross‐sectional average solids volume concentrations higher than 0.25 throughout the entire C‐TFB. At all measuring positions there was no net downflow of solids and a good gas‐solid mixing was observed. © 2008 American Institute of Chemical Engineers AIChE J, 2008