Selecting fines recycle methods to optimize fluid bed combustor performance

Technical Report · Thu May 01 00:00:00 EDT 1980

DOI:https://doi.org/10.2172/5268601· OSTI ID:5268601

Rickman, W. S.; Fields, D. E.; Brimhall, W. L.; Callahan, S. F.

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 Atomics, San Diego, CA (United States)
• DOE Contract Number: AT03-76SF71053
• OSTI ID: 5268601
• Report Number(s): GA-A-15901
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
01 COAL, LIGNITE, AND PEAT
COMBUSTION
EFFICIENCY
FLUIDIZED-BED COMBUSTORS
MATHEMATICAL MODELS
OPTIMIZATION
PERFORMANCE
COAL
COAL FINES
FLUIDIZED-BED COMBUSTION
GRAPHITE
RECYCLING
CARBON
CARBONACEOUS MATERIALS
CHEMICAL REACTIONS
COMBUSTORS
ELEMENTS
ENERGY SOURCES
FOSSIL FUELS
FUELS
NONMETALS
OXIDATION
THERMOCHEMICAL PROCESSES
421000* - Engineering- Combustion Systems
014000 - Coal
Lignite
& Peat- Combustion