Absorption, electrodialysis and additional regeneration in two flue gas SO/sub 2//NO/sub x/ cleanup processes

Conference · Thu Jan 01 00:00:00 EST 1987

OSTI ID:6778800

Walker, R J; Pennline, H W

Eleven potential adsorbents for use in the two processes were tested in a laboratory-scale bubble column. Best absorbent performance was obtained with iron EDTA in an ammonium sulfite/sulfate solution. Removals of greater than 95% were observed for SO/sub 2/, NO, and NO/sub 2/ from a simulated flue gas containing N/sub 2/, O/sub 2/, CO/sub 2/, SO/sub 2/, NO, and NO/sub 2/. Laboratory-scale electrodialysis tests of fresh scrubbing liquor revealed that iron EDTA tended to permeate through anion-selective membranes and thus deleteriously affected process performance. Screening tests with twelve types of anion-selective membranes showed that three had EDTA permeation rates that were acceptable for process operation. Two methods of regeneration with respect to the NO/sub x/-removal component were investigated. Thermal stripping did not appear successful for producing nitrogen oxides in the off-gas from the stripper. A thermal treatment of the spent liquor at 50/sup 0/C successfully regenerated iron EDTA. The mechanism is being investigated.

• OSTI ID: 6778800
• Report Number(s): CONF-871113-
• Resource Relation: Conference: American Institute of Chemical Engineers annual meeting, New York, NY, USA, 15 Nov 1987; Other Information: Technical Paper 58D
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
20 FOSSIL-FUELED POWER PLANTS
AMMONIUM COMPOUNDS
SORPTIVE PROPERTIES
AMMONIUM SULFATES
FLUE GAS
DESORPTION
NITROGEN OXIDES
ABSORPTION
SULFITES
SULFUR DIOXIDE
ADSORBENTS
AIR POLLUTION CONTROL
DENITRIFICATION
DESULFURIZATION
ELECTRODIALYSIS
IRON
PERFORMANCE
REGENERATION
REMOVAL
TEMPERATURE DEPENDENCE
CHALCOGENIDES
CHEMICAL REACTIONS
CONTROL
DIALYSIS
ELEMENTS
GASEOUS WASTES
METALS
NITROGEN COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
POLLUTION CONTROL
SEPARATION PROCESSES
SULFATES
SULFUR COMPOUNDS
SULFUR OXIDES
SURFACE PROPERTIES
TRANSITION ELEMENTS
WASTES
010800* - Coal
Lignite
& Peat- Waste Management
200202 - Fossil-Fueled Power Plants- Waste Management- Noxious Gas & Particulate Emissions