Effect of the size distribution of coal on fluidized-bed combustion
To study the effect of the particle-size distribution on its combustion characteristics, coal was burned in a 0.25 m-square fluidized-bed combustor with a 3-m freeboard. A higher fines content increased the loss of unburned coal by elutriation, but reduced the loss from overflow from the bed surface. The overall combustion efficiency varied only slightly with the size distribution; the efficiency of combustion within the bed was reduced, but more combustion took place in the freeboard, both for 9.5-25 mm particles, owing to segregation in the bed, and for <2 mm particles, owing to elutriation. NO/SUB/x emission for two-stage combustion with these two size ranges was considerably higher than for particles within the broader range <25 mm. Since segregation of coarse particles and elutriation of unburned finer particles increase NO/SUB/x emission and reduced the bed combustion efficiency, it is desirable to use coal with a broad particle-size distribution.
- OSTI ID:
- 5967064
- Journal Information:
- Int. Chem. Eng.; (United States), Journal Name: Int. Chem. Eng.; (United States) Vol. 24:3; ISSN INCEA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
014000* -- Coal
Lignite
& Peat-- Combustion
CARBONACEOUS MATERIALS
CHALCOGENIDES
CHEMICAL REACTION KINETICS
COAL
COAL FINES
COMBUSTION KINETICS
COMBUSTORS
DISTRIBUTION
EFFICIENCY
ELUTRIATION
EMISSION
ENERGY SOURCES
FLUIDIZED-BED COMBUSTORS
FOSSIL FUELS
FUELS
KINETICS
LOSSES
MATERIALS
NITROGEN COMPOUNDS
NITROGEN OXIDES
OXIDES
OXYGEN COMPOUNDS
PARTICLE SIZE
REACTION KINETICS
SEPARATION PROCESSES
SIZE