Electrochemical regeneration of iron-chelates for combined NO{sub x} and SO{sub 2} removal from combustion flue gas

Conference · Tue Dec 31 04:00:00 EST 1996

OSTI ID:435606

Tseng, S; Babu, M ^[1]; Niksa, M ^[2]; Coin, R ^[3]

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1. Dravo Lime Co., Pittsburgh, PA (United States)
2. Electrode Corp., Chardon, OH (United States)
3. Eltech Research Corp., Fairport Harbor, OH (United States)

To control SO{sub 2} emissions utility stations can choose to switch to fuels containing lesser sulfur or they can build wet or dry scrubbers. The control of the NO{sub x} emissions is more complicated. Available technologies to reduce the NO{sub x} emissions include selective catalytic reduction (SCR), selective non-catalytic reduction (SNCR) and combustion modifications such as the installation of low NO{sub x} burners and utilization of gas reburn techniques. The ThioNO{sub x}{reg_sign} process under development by Dravo Lime Company (DLC) is an emerging post-combustion flue gas clean-up technology. It can simultaneously remove NO{sub x} and SO{sub 2} from boilers burning high-sulfur coals. In this process, SO{sub 2} is removed by scrubbing the flue gas with slaked Thiosorbic{reg_sign} lime (a magnesium-enhanced lime) slurry. The removal of NO{sub x} is achieved by adding to the scrubbing liquor iron-EDTA, a metal chelate, which binds and removes NO from the flue gas. The ThioNO{sub x} process is an attractive option for utility stations already equipped with wet scrubbers to reduce the emissions of SO{sub 2}.

• OSTI ID: 435606
• Report Number(s): CONF-960805--
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
20 FOSSIL-FUELED POWER PLANTS
CHELATING AGENTS
COMBINED SOXNOX PROCESSES
COST ESTIMATION
EDTA
ELECTROCHEMICAL CELLS
IRON COMPOUNDS
REGENERATION
RETROFITTING