Slug flow model for coal combustion with sulfur emission control by limestone or dolomite
A model is developed for coal combustion in fluidized beds under slugging conditions with sulfur removal by an additive of limestone or dolomite. The gas flow analysis is based on the slug flow theory of Hovmand and Davidson with modifications to account for the bubbling region prior to slug formation. Equations following the combustion and sulfation reactions are derived for the variations in coal size and additive sulfate loading along the bed axis. The gaseous reactant balances are then carried out for both the oxygen and sulfur dioxide with the reaction rates based on coal size and additive loading. The model indicates that the presence of slug flow in the bed contributes to a lower combustion efficiency but to a higher sulfur retention. The model predictions are compared with experimental data taken under various operating conditions of the 152.4 mm diameter fluidized bed at Argonne National Laboratory. The predicted combustion efficiency and sulfur retention are in good agreement with measurements except for the case when internals are present in the bed.
- Research Organization:
- Argonne National Lab., Ill. (USA)
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 5151966
- Report Number(s):
- CONF-771102-22
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
014000* -- Coal
Lignite
& Peat-- Combustion
AIR POLLUTION ABATEMENT
ALKALINE EARTH METAL COMPOUNDS
CARBON COMPOUNDS
CARBONACEOUS MATERIALS
CARBONATE ROCKS
CARBONATES
CHALCOGENIDES
CHEMICAL REACTIONS
COAL
COMBUSTION
DOLOMITE
ENERGY SOURCES
FLUID FLOW
FLUIDIZED-BED COMBUSTION
FOSSIL FUELS
FUELS
LIMESTONE
MAGNESIUM CARBONATES
MAGNESIUM COMPOUNDS
MATHEMATICAL MODELS
MINERALS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
POLLUTION ABATEMENT
RESERVOIR ROCK
ROCKS
SEDIMENTARY ROCKS
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES