Evaluation of minimum-fluidizing velocity correlations for bed particles used in fluidized-bed calcination processes
Minimum-fluidizing velocities were measured for 73 beds obtained by screening fourteen types of bed material encountered in waste calcination processes. Several mixtures of different particles sizes were also examined. Spherical glass beads were used as a reference material. Particle densities ranged from 1311 to 3630 kg/m/sup 3/ and particle diameters ranged from 0.17 to 1.08 mm. Bulk voidages in the beds ranged from 0.30 to 0.51, and bed voidage at the minimum-fluidizing velocity was 1 to 2% higher than the bulk voidage. Particle sphericities were calculated; their values ranged as low as 0.60. Twenty-three minimum-fluidizing velocity correlations were obtained from a literature search. Minimum-fluidizing velocities predicted by the correlations were compared to experimentally measured minimum-fluidizing velocities for the 73 beds used in this study. The accuracy criterion applied to the correlations was that the predicted values of minimum-fluidizing velocity must be within 20% of the measured value to be considered acceptable. Four correlations reported in the literature showed potential for predicting minimum-fluidizing velocities within 20%. The four acceptable correlations (within 20% accuracy) obtained from the literature predicted minimum-fluidizing velocities within 15% of the measured velocity, for the bed materials tested in this study. 15 refs., 3 figs., 22 tabs.
- Research Organization:
- Westinghouse Idaho Nuclear Co., Inc., Idaho Falls (USA)
- DOE Contract Number:
- AC07-84ID12435
- OSTI ID:
- 6110111
- Report Number(s):
- WINCO-1007; ON: DE89013727
- Resource Relation:
- Other Information: Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS
CALCINATION
COMPARATIVE EVALUATIONS
HIGH-LEVEL RADIOACTIVE WASTES
RADIOACTIVE WASTE PROCESSING
AIR FLOW
FLUIDIZED BEDS
VELOCITY
CHEMICAL REACTIONS
DECOMPOSITION
FLUID FLOW
GAS FLOW
MANAGEMENT
MATERIALS
PROCESSING
PYROLYSIS
RADIOACTIVE MATERIALS
RADIOACTIVE WASTES
THERMOCHEMICAL PROCESSES
WASTE MANAGEMENT
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WASTES
052002* - Nuclear Fuels- Waste Disposal & Storage
053000 - Nuclear Fuels- Environmental Aspects