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Freeboard reactions in fluidized coal combustion. Technical progress report, 1 March 1981-31 July 1981

Author
Beer, J. M.
Published
United States : [publisher not identified], 1981
Springfield, Va.: National Technical Information Service, [approximately 1981]
Physical Description
microfiche : negative ; 11 x 15 cm
Additional Creators
Chaung, T. Z., Dutta, A., and Walsh, P. M.

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Summary
A typical nitric oxide mole fraction of 500 ppM is observed in the combustion products near the bed surface in a coal-fired fluidized combustor. In order to reach an acceptable NO level at the combustor outlet under these conditions, NO must be further reduced to N2 in the freeboard. About a factor of two decreases in NO in the freeboard is usually observed. The experimentally determined variations of NO with height during combustion of bituminous and subbituminous coals are compared with the predictions of a semi-empirical model in which NO reduction is assumed to occur via reaction with coal char. The concentration of char particles was determined from measured bed properties using a mechanistic model for the initial entrainment at the bed surface and the motion of the particles in the freeboard. The calculated char densities and the assumed reduction mechanism account very well for all of the NO profiles observed at distances greater than 0.5m above the bed, in the absence of secondary air injection. Good agreement was also found above the secondary air mixing zone. Under some conditions the entire experimental profile, including the splash zone, was accurately predicted. The possible contributions of other reactions which might contribute to NO reduction in the splash zone are assessed.
Report Numbers
DE85007783; DOE/PC/30215-2
Other Subject(s)
Collection
NTIS collection.
Note
DOE contract number: FG22-80PC30215
OSTI Identifier 6145618
Research organization: Massachusetts Inst. of Tech., Cambridge (USA).
View MARC record | catkey: 47351416