Effect of coal particle size on the performance of a fluidised bed coal combustor
This paper reports a study of the combustion of monosized coal fractions fed continuously to the bed via an overbed feeder. Data showing the effect of coal size, excess air and combustion efficiency are presented. Measurements using crushed coal (<1.5 mm) fed pneumatically to the bed are included for comparison. The measurements of nitric oxide concentrations in the bed and freeboard of the 0.3 m square fluidised bed have shown that nitric oxide is produced within the bed and are reduced in the freeboard. Elutriation rates and NO concentrations measured at the exit of the freeboard both decrease with increasing coal particle size up to a size of a 9.5 mm for most conditions. The combustion of monosized coal particles in the fluidised bed has highlighted the interdependence of elutriation rate, bed carbon content, carbon concentration in the freeboard and nitric oxide emissions. The results also indicate that an optimum operating condition for this particular fluidised bed combustor may exist for the 9.5 mm coal size at 20% excess air. However, further experimental results are necessary, in particular with respect to the complex phenomena occurring in the freeboard region.
- Research Organization:
- Univ. of Sheffield, England
- OSTI ID:
- 6695848
- Report Number(s):
- CONF-820304-Vol.2
- Journal Information:
- Prepr. Pap. - Am. Chem. Soc., Div. Fuel Chem.; (United States), Journal Name: Prepr. Pap. - Am. Chem. Soc., Div. Fuel Chem.; (United States) Vol. 27:1; ISSN ACFPA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
014000* -- Coal
Lignite
& Peat-- Combustion
AIR POLLUTION ABATEMENT
CARBONACEOUS MATERIALS
CHALCOGENIDES
CHARS
CHEMICAL REACTIONS
COAL
COMBUSTION
COMBUSTORS
DATA
EFFICIENCY
ELUTRIATION
EMISSION
ENERGY SOURCES
EXPERIMENTAL DATA
FLUIDIZED-BED COMBUSTION
FLUIDIZED-BED COMBUSTORS
FOSSIL FUELS
FUEL-AIR RATIO
FUELS
INFORMATION
MATERIALS
NITRIC OXIDE
NITROGEN COMPOUNDS
NITROGEN OXIDES
NUMERICAL DATA
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PARTICLE SIZE
PERFORMANCE
POLLUTION ABATEMENT
PYROLYSIS PRODUCTS
SEPARATION PROCESSES
SIZE
THERMOCHEMICAL PROCESSES