Modeling of coal combustion in circulating fluidized bed combustors
- CSIC, Zaragoza (Spain). Instituto de Carboquimica
- CIEMAT, Madrid (Spain)
The effect of operating conditions (coal particle size, temperature, excess air and linear gas velocity) on carbon combustion efficiencies obtained in a circulating fluidized bed combustor was studied. Two different lignites and an anthracite were used as fuel. The operating conditions affect the combustion efficiency of each coal differently. To explain this, a mathematical model was developed. To determine axial voidage profiles the model uses a modified version of the Kunii and Levenspiel exponential decay hydrodynamic model, which divides the bed into a dense region at the bottom of the bed and a dilute region above. In the dilute region a core-annulus structure with solid dispersion from core to the annulus was considered. The developed model gives good predictions of the effect of the operating variables (air velocity, excess air and temperature) on the carbon combustion efficiencies, obtained in a circulating fluidized bed pilot plant.
- OSTI ID:
- 245020
- Report Number(s):
- CONF-950522--; ISBN 0-7918-1305-3
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
AIR FLOW
ANTHRACITE
CHARS
CIRCULATING SYSTEMS
CYCLONE SEPARATORS
FLOW RATE
FLUID MECHANICS
FLUIDIZED-BED COMBUSTION
FLUIDIZED-BED COMBUSTORS
FUEL-AIR RATIO
LIGNITE
MATHEMATICAL MODELS
NUMERICAL DATA
PARAMETRIC ANALYSIS
SORBENT INJECTION PROCESSES
TEMPERATURE DEPENDENCE
TEST FACILITIES
THERMAL EFFICIENCY