Selecting fines recycle methods to optimize fluid bed combustor performance
Testing and analysis of a number of different fines recycle methods for fluid bed combustors has led to a generalized modeling technique. This model accounts for the effect of pertinent variables in determining overall combustion efficiencies. Computer application of this model has allowed trade-off studies to be performed that show the overall process effects of changes in individual operating parameters. Verification of the model has been accomplished in processing campaigns while combusting fuels such as graphite and bituminous coal. A 0.4 MW test unit was used for the graphite experimental work. Solid fuel was typically crushed to 5 mm maximum screen size. Bed temperatures were normally controlled at 900/sup 0/C; the combustor was an atmospheric unit with maximum in-bed pressures of 0.2 atm. Expanded bed depths ranged from 1.5 to 3 meters. Additional data was taken from recycle tests sponsored by EPRI on the B and W 6 ft x 6 ft fluid bed combustor. These tests used high sulfur coal in a 1.2 meter deep, 850/sup 0/C atmospheric fluidized bed of limestone, with low recycle rates and temperatures. Close agreement between the model and test data has been noted, with combustion efficiency predictions matching experimental results within 1%.
- Research Organization:
- General Atomic Co., San Diego, CA (USA)
- DOE Contract Number:
- AT03-76SF71053
- OSTI ID:
- 5268601
- Report Number(s):
- GA-A-15901
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
014000 -- Coal
Lignite
& Peat-- Combustion
42 ENGINEERING
421000* -- Engineering-- Combustion Systems
CARBON
CARBONACEOUS MATERIALS
CHEMICAL REACTIONS
COAL
COAL FINES
COMBUSTION
COMBUSTORS
EFFICIENCY
ELEMENTS
ENERGY SOURCES
FLUIDIZED-BED COMBUSTION
FLUIDIZED-BED COMBUSTORS
FOSSIL FUELS
FUELS
GRAPHITE
MATHEMATICAL MODELS
NONMETALS
OPTIMIZATION
OXIDATION
PERFORMANCE
RECYCLING
THERMOCHEMICAL PROCESSES