Simultaneous reduction of emissions of SO{sub 2}, NOx, and N{sub 2}O from fluidized bed combustors

Book · Sun Dec 31 04:00:00 EST 1995

OSTI ID:287969

Shimizu, Tadaaki; Miura, Masashi; Togashi, Takeshi; Tonsho, Masaru; Inagaki, Makoto ^[1]; Matsukata, Masahiko ^[2]

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1. Niigata Univ., Ikarashi, Niigata (Japan). Dept. of Chemistry and Chemical Engineering
2. Osaka Univ., Machikaneyama, Toyonaka (Japan). Dept. of Chemical Engineering

The effects of staged air feed and limestone feed into a bubbling fluidized bed combustor on emissions of SO{sub 2}, NOx and N{sub 2}O were investigated. The staged air feed reduced both NOx and N{sub 2}O emissions, but it inhibited SO{sub 2} removal. NOx emission increased with increasing sulfur removal. To solve the interference problem among reduction of NOx, N{sub 2}O, and SO{sub 2}, a two-staged fluidized bed combustor was proposed, in which combustion of coal was conducted in the lower bed and SO{sub 2} capture in the upper bed. To simulate two-staged FBC, flue gas from a circulating fluidized bed combustor was fed into a fluidized bed reactor of limestone. NOx emission did not increase with SO{sub 2} capture and more effective decrease in N{sub 2}O emission was achieved for the two-staged fluidized bed combustion in comparison to the conventional in-situ SO{sub 2} capture. The results of SO{sub 2} capture and N{sub 2}O reduction for two-staged fluidized bed were analyzed using the Junii-Levenspiel model. A fixed bed reactor was employed to obtain kinetic data. The results of the calculations agreed fairly well with the experimental results.

• OSTI ID: 287969
• Report Number(s): CONF-950522--; ISBN 0-7918-1305-3
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
AIR POLLUTION ABATEMENT
ANTHRACITE
BITUMINOUS COAL
DESIGN
EXPERIMENTAL DATA
FLUIDIZED-BED COMBUSTION
FLUIDIZED-BED COMBUSTORS
FUEL-AIR RATIO
NITROGEN OXIDES
NITROUS OXIDE
SORBENT INJECTION PROCESSES
STAGED COMBUSTION
SULFUR DIOXIDE