Further development of the THIONOX process for simultaneous removal of SO{sub 2} and NO{sub x} from combustion flue gas

Book · Sat Dec 31 04:00:00 EST 1994

OSTI ID:52010

Tseng, S C; Babu, M ^[1]

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1. Dravo Lime Co., Pittsburgh, PA (United States)

THIONOX{reg_sign} process can simultaneously remove SO{sub 2} and NO{sub x} from combustion flue gas from boilers burning high sulfur fossil fuel. In this process, SO{sub 2} is removed in a wet scrubber by magnesium-enhanced lime slurry and NO{sub x} is removed by adding iron-EDTA, a metal chelate, to the scrubbing liquor. This technology is an attractive option for the utility boilers to remove NO{sub x} in existing wet scrubbers, which were designed originally to reduce the emission of SO{sub 2}. With a research grant from the Pennsylvania Energy Development Authority, the Dravo Lime Company (DLC) is continuing its efforts to develop the THIONOX{reg_sign} process using its 5kWe bench scale wet FGD facility. The main goal is to evaluate alternate means to keep iron-EDTA in the ferrous form. Chemical, thermal, and electrochemical regeneration were attempted. To be presented in this paper are the data obtained mainly from tests using an electrochemical cell to regenerate the ferrous ions. Implications of this technology to reduce the emissions of SO{sub 2} and NO{sub x} from the flue gas streams from utility boilers burning high-sulfur coal will also be discussed.

• OSTI ID: 52010
• Report Number(s): CONF-940930--
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
20 FOSSIL-FUELED POWER PLANTS
AIR POLLUTION CONTROL
CALCIUM OXIDES
CHELATES
COAL
COMBINED SOXNOX PROCESSES
COMBUSTION
EXPERIMENTAL DATA
IRON COMPOUNDS
NITROGEN OXIDES
PARAMETRIC ANALYSIS
PERFORMANCE TESTING
PROCESS DEVELOPMENT UNITS
SCRUBBERS
SULFUR DIOXIDE
TEST FACILITIES