The effects of staged air feed and limestone feed into a bubbling fluidized bed combustor on emissions of SO2, NOx and N2O were investigated. The staged air feed reduced both NOx and N2O emissions, but it inhibited SO2 removal. NOx emission increased with increasing sulfur removal. To solve the interference problem among reduction of NOx, N2O, and SO2, a two-staged fluidized bed combustor was proposed, in which combustion of coal was conducted in the lower bed and SO2 capture in the upper bed. To simulate two-staged FBC, flue gas from a circulating fluidized bed combustor was fed in to a fluidized bed reactor of limestone. NOx emission did not increase with SO2 capture and more effective decrease in N2O emission was achieved for the two-staged fluidized bed combustion in comparison to the conventional in-situ SO2 capture. The results of SO2 capture and N2O reduction for two-staged fluidized bed were analyzed using the Kunii-Levenspiel model. A fixed bed reactor was employed to obtain kinetic data. The results of the calculations agreed fairly well with the experimental results.
|Number of pages||8|
|Journal||Proceedings of the International Conference on Fluidized Bed Combustion|
|Publication status||Published - 1995 Jan 1|
|Event||Proceedings of the 13th International Conference on Fluidized Bed Combustion. Part 2 (of 2) - Orlando, FL, USA|
Duration: 1995 May 7 → 1995 May 10
ASJC Scopus subject areas