Experimental validation of the gas–solid flow in the CFB riser

In this paper, an experimental study is performed to investigate the flow structure in a circulating fluidized bed (CFB). The typical core-annulus structure and small amount of back-mixing of particles near the wall of the riser were observed. The axial solid concentration distributions contain a di...

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Bibliographic Details
Published in:Fuel processing technology 2010-08, Vol.91 (8), p.927-933
Main Authors: Wang, Xueyao, Liao, Liangliang, Fan, Baoguo, Jiang, Fan, Xu, Xiang, Wang, Shengdian, Xiao, Yunhan
Format: Article
Language:English
Subjects:
Applied sciences
CFB riser
Circulating
Computer simulation
Drag force
EMMS model
Energy
Energy. Thermal use of fuels
Exact sciences and technology
Exit effects
Flux
Fuels
Gas–solid flow
Mathematical models
Pressure drop
Risers
Walls
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Summary:In this paper, an experimental study is performed to investigate the flow structure in a circulating fluidized bed (CFB). The typical core-annulus structure and small amount of back-mixing of particles near the wall of the riser were observed. The axial solid concentration distributions contain a dilute region towards the up-middle zone and a dense region near the bottom and the top exit zones. Furthermore, the solid concentration decreases with the increase of the superficial gas velocity, and increases with the increment of the circulation rate at the same height position. The total pressure drop of the main bed represents a linear relationship with the solid flux rate. In the dense phase zone, the solid concentration increases linearly with the augmentation of the solid flux, however, the change of the solid concentration is slight, even unchangeable at the up zones. In addition, based on the Energy-Minimization Multi-Scale (EMMS) method, a revised drag force model is proposed, which is coupled in the Eulerian two-fluid model for simulating the flow structure in the riser. Numerical results are consistent with the experimental data, which indicate the revised drag force model is very successful in simulating flow structure of the dense gas–solid two-phase flow.
ISSN:0378-3820
1873-7188
DOI:10.1016/j.fuproc.2010.02.020