Atmospheric Fluidized Bed Combustion testing of North Dakota lignite
The sulfur retention by the inherent alkali, and added limestone sorbent, perform about the same and are reasonably predictable within a range of about +-10% retention by application of alkali to sulfur ratio. Temperature has a substantial effect on the retention of sulfur by the inherent alkali or limestone. The temperature effect is not yet fully understood but it appears to be different for different coals and operational conditions. The emission of SO/sub 2/ from the fluid bed burning the Beulah lignite sample used for these tests can be controlled to meet or better the current emission standards. The injection of limestone to an alkali-to-sulfur molar ratio of 1.5 to 1, should lower the SO/sub 2/ emissions below the current requirement of 0.6 lb SO/sub 2//10/sup 6/ Btu to 0.4 lb SO/sub 2//10/sup 6/ Btu, a safe 33% below the standard. Agglomeration of bed material, and consequent loss of fluidization quality can be a problem when burning high sodium lignite in a silica bed. There appears, however, to be several ways of controlling the problem including the injection of calcium compounds, and careful control of operating conditions. The heat transfer coefficients measured in the CPC and GFETC tests are comparable to data obtained by other researchers, and agree reasonably well with empirical conditions. The NO/sub x/ emissions measured in all of the tests on Beulah lignite are below the current New Source Performance Standard of 0.5 lb NO/sub 2//10/sup 6/ Btu input. Combustion efficiencies for the Beulah lignite are generally quite high when ash recycle is being used. Efficiencies in the range of 98% to 99%+ have been measured in all tests using this fuel.
- Research Organization:
- Combustion Power Co., Inc., Menlo Park, CA (USA); Department of Energy, Grand Forks, ND (USA). Grand Forks Energy Technology Center
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC03-78ET12297
- OSTI ID:
- 5290712
- Report Number(s):
- CONF-800428-7
- Resource Relation:
- Conference: 6. international conference on fluidized bed combustion, Atlanta, GA, USA, 9 Apr 1980
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
FLUIDIZED-BED COMBUSTION
EFFICIENCY
LIGNITE
AGGLOMERATION
ASHES
COAL
COMBUSTION
HEAT TRANSFER
LIMESTONE
MINERALS
RETENTION
SULFUR
TEMPERATURE DEPENDENCE
TEST FACILITIES
BROWN COAL
CARBONACEOUS MATERIALS
CARBONATE ROCKS
CHEMICAL REACTIONS
ELEMENTS
ENERGY SOURCES
ENERGY TRANSFER
FOSSIL FUELS
FUELS
NONMETALS
OXIDATION
RESIDUES
ROCKS
SEDIMENTARY ROCKS
THERMOCHEMICAL PROCESSES
014000* - Coal
Lignite
& Peat- Combustion