Predictive models for circulating fluidized bed combustors
The overall objective of this investigation is to develop experimentally verified models for circulating fluidized bed (CFB) combustors. The Appendix to this report presents our three dimensional computer code which we developed in last few months. It generalizes the two dimensional version of our code FLUFIX used at Argonne National Laboratory. We tested this code by comparing the computations to a three-dimensional effect observed in bubbling fluidized beds. It is known that a circular jet entering a two dimensional bed produces maxima in time averaged porosities that are above the jet entrance, while two dimensional slit jets give maxima at the entrance. We found that our code is able to predict this three dimensional effect. There is, however, a small discrepancy between the computation and the experiment. This may due to the use of insufficiently fine grids, as seen by the poor resolution of bubbles. The computations were done on the University of Illinois Cray X-MP, in corperation with the National Science Foundation. 3 refs., 11 figs.
- Research Organization:
- Illinois Inst. of Tech., Chicago, IL (USA). Dept. of Chemical Engineering
- Sponsoring Organization:
- DOE/FE
- DOE Contract Number:
- FG22-89PC89769
- OSTI ID:
- 6998655
- Report Number(s):
- DOE/PC/89769-T1; ON: DE90010842
- Country of Publication:
- United States
- Language:
- English
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Lignite
& Peat-- Combustion
BUBBLES
CIRCULATING SYSTEMS
COMBUSTORS
COMPUTER CODES
DOCUMENT TYPES
EQUATIONS
FINITE DIFFERENCE METHOD
FLUID FLOW
FLUID MECHANICS
FLUIDIZATION
FLUIDIZED-BED COMBUSTORS
ITERATIVE METHODS
JETS
MATHEMATICAL MODELS
MECHANICS
NUMERICAL SOLUTION
PROGRESS REPORT
SOLIDS FLOW
VELOCITY