Abstract
The rate of CO oxidation in the freeboard of a fluidized bed coal combustor is retarded by the presence of hydrocarbons with which CO has to compete for the Oh radical and by the presence of solids on which radicals recombine. This retarding effect has been quantified and incorporated into a CO oxidation model. The importance of the retardation of CO oxidation was assessed by a detailed sensitivity analysis in which the relative contributions of hydrocarbons and solid particles were taken into account, together with the generation of CO by the heterogeneous reaction between fine and large char on the one hand and oxygen on the other. Results of this analysis and comparison with experiment indicate that depletion of OH concentration by reaction with hydrocarbons is the major retarding effect in the CO oxidation process and that the correct determination of the CO and O 2 concentrations along the freeboard require that the generation of CO and the consumption of O 2 by the char-O 2 reaction be taken into account.
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