Nitric oxide reduction in the freeboard of a fluidized bed coal combustor

Conference · Thu Dec 31 23:00:00 EST 1981 · Symp. (Int.) Combust., (Proc.); (United States)

OSTI ID:5730135

Walsh, P M; Chaung, T Z; Dutta, A; Beer, J M; Sarofim, A F

Nitric oxide mole fractions of 650 to 1250 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
• OSTI ID: 5730135
• Report Number(s): CONF-820801-
• Journal Information: Symp. (Int.) Combust., (Proc.); (United States), Journal Name: Symp. (Int.) Combust., (Proc.); (United States); ISSN SYMCA
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
014000* -- Coal
Lignite
& Peat-- Combustion
42 ENGINEERING
421000 -- Engineering-- Combustion Systems
500200 -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
CARBONACEOUS MATERIALS
CHALCOGENIDES
CHEMICAL REACTIONS
COAL
COMBUSTION
COMBUSTION PRODUCTS
COMBUSTORS
ENERGY SOURCES
FLUIDIZED-BED COMBUSTION
FLUIDIZED-BED COMBUSTORS
FOSSIL FUELS
FUELS
MATERIALS
NITRIC OXIDE
NITROGEN COMPOUNDS
NITROGEN OXIDES
OXIDATION
OXIDES
OXYGEN COMPOUNDS
REDUCTION
THERMOCHEMICAL PROCESSES