SO/sub x/ and NO/sub x/ abatement in Japan

Conference · Thu Mar 01 00:00:00 EST 1979 · Prepr., Div. Pet. Chem., Am. Chem. Soc.; (United States)

OSTI ID:6084928

Ando, J

The status, chemistry, technology, and problems of SO/sub x/ and NO/sub x/ abatement were discussed. FGD plants use the wet lime/limestone process or the indirect lime/limestone process. NO/sub x/ emissions from stationary sources have been regulated by emission standards and by agreements with local governments. The major ways for NO/sub x/ abatement of stationary sources have been combustion modification, change of fuel and flue gas denitrification. Among the denitrification processes, selective catalytic reduction (SCR) that used NH/sub 3/ and catalyst at 200 to 450/sup 0/C to reduce NO/sub x/ to N/sub 2/ has been most popular and adopted at about 60 commercial plants because it was simple, could give a high NO/sub x/ removal efficiency of over 90% and does not produce by-products. The important keys to obtaining a high NO/sub x/ removal efficiency by SNR are the good rapid mixing of NH/sub 3/ and flue gas and a sufficient reaction time at a suitable temperature range. Two dry processes, copper oxide process and activated carbon process, were discussed for simultaneous NO/sub x/ and SO/sub x/ removal. Wet simultaneous removal of NO/sub x/ and SO/sub x/ was also discussed. For the copper oxide process, a high SO/sub x/ concentration required frequent regeneration and tended to reduce NO/sub x/ removal efficiency. For the carbon process, the carbon consumption increased with SO/sub x/ concentration. Wet simultaneous removal processes suited SO/sub x/-rich gas because SO/sub 2/ worked as the reducing agent and increased the NO/sub x/ removal efficiency. 8 figures, 1 table.

• Research Organization: Chuo Univ., Tokyo, Japan
• OSTI ID: 6084928
• Report Number(s): CONF-790415-P4
• Journal Information: Prepr., Div. Pet. Chem., Am. Chem. Soc.; (United States), Vol. 24:2; Conference: 177. national meeting of the American Chemical Society, Honolulu, HI, USA, 1 Apr 1979
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
54 ENVIRONMENTAL SCIENCES
37 INORGANIC
ORGANIC
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01 COAL, LIGNITE, AND PEAT
AIR POLLUTION ABATEMENT
JAPAN
NITROGEN OXIDES
SULFUR OXIDES
AMMONIA
CARBON
CATALYSTS
COMBUSTION
COPPER OXIDES
DENITRIFICATION
FLUE GAS
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NITROGEN
REDUCTION
ASIA
CHALCOGENIDES
CHEMICAL REACTIONS
COPPER COMPOUNDS
CRYOGENIC FLUIDS
ELEMENTS
FLUIDS
GASEOUS WASTES
HYDRIDES
HYDROGEN COMPOUNDS
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
NONMETALS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
POLLUTION ABATEMENT
SCRUBBING
SULFUR COMPOUNDS
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENT COMPOUNDS
WASTES
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