Actions for Freeboard reactions in fluidized coal combustion

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Freeboard reactions in fluidized coal combustion

Author
Walsh, P. M.
Published
United States : [publisher not identified], 1984
Springfield, Va.: National Technical Information Service, [approximately 1984]
Physical Description
microfiche : negative ; 11 x 15 cm
Additional Creators
Beer, J. M. and Dutta, A.

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Summary
The objective of this study was to determine the contribution of freeboard combustion to overall fixed carbon conversion during atmospheric pressure fluidized bed combustion of Kentucky No. 9 high volatile bituminous coal. The progress of the O2/char reaction in the freeboard was inferred from O2 profiles determined by gas sampling. The rates of O2 consumption were in good agreement with the O2/char rate expression of Sergeant and Smith (1973), except at the lowest temperature investigated (964 K). The discrepancy in this case might be due to catalysis of the O2/char reaction by lime, since this was the first run of the series. Extrapolation of the O2 profile to the bed surface using the rate expression of Sergeant and Smith showed that approximately all of the fixed carbon conversion could be accounted for by freeboard combustion. A simple model is proposed in which devolatilization, fragmentation, attrition, and volatile combustion are limited to the bed; with combustion of the finely ground char occurring only in the freeboard. This model predicts O2 at the combustor outlet within 60% of the measured values, except in the low temperature/high lime case.
Report Numbers
DE85007741; DOE/PC/30215-10
Other Subject(s)
Collection
NTIS collection.
Note
DOE contract number: FG22-80PC30215
OSTI Identifier 6078970
Research organization: Massachusetts Inst. of Tech., Cambridge (USA).
View MARC record | catkey: 47351178