Scale suppression in lime/limestone FGD systems
The experimental results on the oxidation of sulfite to sulfate in a simulated lime/limestone scrubber for SO/sub 2/ indicated that: (a) NO acts as an inhibitor for sulfite oxidation; (b) NO/sub 2/ acts as a promoter either catalytically or as a direct oxidant; (c) the inhibitory effect of NO is not adequate to suppress the promotive effect of NO/sub 2/ at a NO/NO/sub 2/ mole ratio of 9 and a NO/sub x/ concentration of 800 ppM (typical flue gas); (d) at a NO/NO/sub 2/ mole ratio of about 12, the oxidation is no greater than it would be without NO/sub x/ present; (e) oxidation is minimized at a NO/NO/sub 2/ mole ratio greater than about 20; and (f) scaling in scrubbers on high NO/sub x/-emitting furnaces, such as cyclones, could be significantly different from that encountered in lower temperature units. A prescrubber for NO/sub 2/ removal should be effective in inhibiting sulfite oxidation in the SO/sub 2/ scrubber. This has not been effectively demonstrated in the laboratory mainly because of an inability to analyze for NO/sub 2/ in the exit gas from the prescrubber. 4 figures, 1 table.
- Research Organization:
- Battelle Columbus Labs., OH
- OSTI ID:
- 6085922
- Report Number(s):
- CONF-790415-P4
- Journal Information:
- Prepr., Div. Pet. Chem., Am. Chem. Soc.; (United States), Journal Name: Prepr., Div. Pet. Chem., Am. Chem. Soc.; (United States) Vol. 24:2; ISSN ACPCA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
010800* -- Coal
Lignite
& Peat-- Waste Management
500200 -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
CHALCOGENIDES
CHEMICAL REACTIONS
CONCENTRATORS
CYCLONE SEPARATORS
DEPOSITS
DESULFURIZATION
EQUIPMENT
FLUE GAS
GASEOUS WASTES
INERTIAL SEPARATORS
INHIBITION
LIME-LIMESTONE WET SCRUBBING PROCESSES
NITROGEN COMPOUNDS
NITROGEN DIOXIDE
NITROGEN OXIDES
OXIDATION
OXIDES
OXYGEN COMPOUNDS
POLLUTION CONTROL EQUIPMENT
SCRUBBING
SULFATES
SULFITES
SULFUR COMPOUNDS
WASTES