Predictions of gas/particle flow with an Eulerian model including a realistic particle size distribution

被引:94
作者
Mathiesen, V
Solberg, T
Hjertager, BH
机构
[1] Aalborg Univ Esbjerg, Chem Engn Lab, DK-6700 Esbjerg, Denmark
[2] Telemark Univ Coll, N-3914 Porsgrunn, Norway
[3] Telemark Technol R&D Ctr Tel Tek, N-3914 Porsgrunn, Norway
关键词
Eulerian CFD model; kinetic theory of granular flow; gas-particle flow; circulating fluidized bed;
D O I
10.1016/S0032-5910(99)00303-4
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
This paper presents a computational study of the flow behavior in a cold-flow pilot-scale circulating fluidized bed. A multi-fluid Computational Fluid Dynamics (CFD) model has been developed and verified against experimental data reported in the literature. The flow model is based on an Eulerian description of the phases where the kinetic theory of granular flow forms the basis for the turbulence modelling in the solid phases. The model is generalized for one gas phase and N number of solid phases to enable a realistic description of the particle size distributions in gas/solids flow systems. Each solid phase is characterized by a diameter, density and restitution coefficient. The simulations are performed with different superficial gas velocities, initial solids concentrations and standard deviations of the particle size distribution. Most emphasis is given to study the effects of different particle size distributions and to study the fluctuating behavior of the dilute gas/solids flow system. Altogether, the simulation results are in very good agreement with experimental data. Both mean diameters, axial and radial mean and turbulent velocities, and mass fluxes are calculated successfully. (C) 2000 Elsevier Science S.A. All rights reserved.
引用
收藏
页码:34 / 45
页数:12
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