Freeboard reactions in fluidized coal combustion. Technical progress report, May 1, 1982-July 31, 1982
Nitric oxide mole fractions of 650 to 1350 ppM were observed in the combustion products near the bed surface during fluidized combustion of bituminous coal. Reduction of NO to N/sub 2/ in the freeboard above the bed decreased NO to the characteristically low levels (80 to 400 mol ppM) observed in the exhaust from fluidized bed combustors. The experimentally measured variations of NO with height in the freeboard are compared with the predictions of a semi-empirical model in which NO reduction is assumed to occur by reaction with entrained coal char. The concentration of char particles is determined from measured bed properties using mechanistic models for the initial particle flux at the bed surface and the motion of particles in the freeboard. The nitric oxide reduction predicted by the model is in good agreement with the reduction observed in five of the six sets of measurements.
- Research Organization:
- Massachusetts Inst. of Tech., Cambridge (USA)
- DOE Contract Number:
- FG22-80PC30215
- OSTI ID:
- 6145588
- Report Number(s):
- DOE/PC/30215-6; ON: DE85008071
- Country of Publication:
- United States
- Language:
- English
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Freeboard reactions in fluidized coal combustion. Technical progress report, 1 March 1981-31 July 1981
Particle entrainment and nitric oxide reduction in the freeboard of a fluidized coal combustor. [Freeboard reactions]
Related Subjects
014000* -- Coal
Lignite
& Peat-- Combustion
AIR POLLUTION CONTROL
CARBONACEOUS MATERIALS
CHALCOGENIDES
CHARS
CHEMICAL REACTIONS
COAL
COMBUSTION
COMBUSTION PRODUCTS
COMBUSTORS
CONTROL
ENERGY SOURCES
FLUIDIZED-BED COMBUSTION
FLUIDIZED-BED COMBUSTORS
FOSSIL FUELS
FUELS
MATERIALS
MATHEMATICAL MODELS
NITRIC OXIDE
NITROGEN COMPOUNDS
NITROGEN OXIDES
OXIDATION
OXIDES
OXYGEN COMPOUNDS
POLLUTION CONTROL
PYROLYSIS PRODUCTS
THERMOCHEMICAL PROCESSES