文档介绍：Powder Technology 214 (2011) 177–187
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Powder Technology
journal homepage: ate/powtec
Numerical and experimental studies on the flow multiplicity phenomenon for
gas–solids two-phase flows in CFB risers
B. Peng a,, J. Zhu b,⁎, C. Zhang a
a Department of Mechanical and Materials Engineering, The University of Western Ontario, London, ON N6A 5B9, Canada
b Department of Chemical and Biochemical Engineering, The University of Western Ontario, London, ON N6A 5B9, Canada
article info abstract
Article history: The flow multiplicity phenomenon in circulating fluidized bed (CFB) risers, . under the same superficial gas
Received 5 February 2011 velocity and solids circulation rate, the CFB risers may sometimes exhibit multiple flow structures, was
Received in revised form 1 July 2011 numerically and experimentally investigated in this study. To investigate the flow multiplicity phenomenon,
Accepted 8 July 2011
the experiments of gas–solids two-phase flows in a 2-D CFB riser with different flow profiles at the inlet of the
Available online 23 July 2011
CFB riser were conducted. Specially designed gas inlet distributors with add-ons are used to generate different
flow profiles at the inlet of the CFB rise. The CFD model using Eulerian–Eulerian approach with k–ε turbulence
Keywords:
fl
Gas–solids two-phase flow model for each phase was employed to numerically analyze the ow multiplicity phenomenon. It is
CFB riser experimentally and numerically proved that for gas–solids two-phase flows, the flow profiles in the fully-
Flow multiplicity phenomenon developed region are dominated by the flow profiles at the inlet. The solids concentration profile is closely
CFD simulation coupled with the velocity profile, and the inlet solids concentration and velocity profiles can largely influence
Experimental study the fully-developed solids concentration and velocity profiles.
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1. Introduction la