Numerical analysis of some effects of the exit geometry and the solids inventory on the solids distribution in a CFB riser
- Aabo Akademi Univ., Turku (Finland). Heat Engineering Lab.
For the description of the hydrodynamics in circulating fluidized bed risers both one-, 1.5-, two- and three-dimensional models have been suggested. The macroscopic 2D/3D model used in this work is, similarly with the common kinetic theory approach, derived through averaging. However, here the averaging time and length scales are larger. The advantages are the short calculation time and the close relationship with experimental studies. The disadvantage is the need for measurement data from a large range of CFB`s for obtaining reliable closure relations. In this paper, the effects of the main process parameters (superficial gas velocity, solids flux, solids inventory) on the solids distribution are studied. The results demonstrate how a CFB can operate either with or without a bottom bed at the same gas superficial velocity and solids flux. Additionally, a comparison between two exit geometries was performed: the solids distribution was clearly affected by an extended exit geometry.
- OSTI ID:
- 357879
- Report Number(s):
- CONF-9705116-; ISBN 0-7918-1557-9; TRN: IM9932%%224
- Resource Relation:
- Conference: 14. international conference on fluidized bed combustion, Vancouver (Canada), 11-16 May 1997; Other Information: PBD: 1997; Related Information: Is Part Of Proceedings of the 14. international conference on fluidized bed combustion: Volume 2; Preto, F.D.S. [ed.] [Canada Centre for Mineral and Energy Technology, Ottawa, Ontario (Canada). Energy Technology Centre]; PB: 647 p.
- Country of Publication:
- United States
- Language:
- English
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