Scale suppression in lime/limestone FGD systems
Scale suppression in lime/limestone FGD systems may be to prevent the oxidation of sulfite to sulfate. Thus, the effect of NO/sub x/ on sulfite oxidation was studied in semibatch laboratory-scale experiments with a 5Vertical Bar3< slurry of hydrated lime containing some fly ash and calcium chloride as the scrubbing liquid and a simulated flue gas containing 76.9Vertical Bar3< by vol nitrogen, 11.1Vertical Bar3< carbon dioxide, 4.7Vertical Bar3< oxygen, 7.0Vertical Bar3< water, 0.25Vertical Bar3< sulfur dioxide, and 0-0.08Vertical Bar3< each of NO and NO/sub x/; the gas flow rate and stirrer speed were held constant at 5 l./min and 1000 rpm, respectively. The NO/sub 2/ acted as a promoter (either catalytically or as a direct oxidant), and NO as an inhibitor, of sulfite oxidation, but the inhibiting effect was insufficient to offset the promoter at NO:NO/sub 2/ molar ratios below 12:1. Oxidation was minimized at 20:1 ratio. The NO/sub x/ composition of industrial boiler flue gases, which typically contain 800 ppm NO/sub x/ at a 9:1 mole ratio can be adjusted by prescrubbing with urea or sulfuric acid solutions to remove NO/sub 2/.
- Research Organization:
- Battelle Mem. Inst., Columbus Lab.
- OSTI ID:
- 6790236
- Report Number(s):
- CONF-790415-
- Journal Information:
- Am. Chem. Soc., Div. Pet. Chem., Prepr.; (United States), Journal Name: Am. Chem. Soc., Div. Pet. Chem., Prepr.; (United States) Vol. 24:2; ISSN ACPCA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
320305* -- Energy Conservation
Consumption
& Utilization-- Industrial & Agricultural Processes-- Industrial Waste Management
BENCH-SCALE EXPERIMENTS
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CONTROL
DATA
DESULFURIZATION
EXPERIMENTAL DATA
FLUE GAS
GASEOUS WASTES
INFORMATION
KINETICS
LIME-LIMESTONE WET SCRUBBING PROCESSES
NITROGEN COMPOUNDS
NITROGEN OXIDES
NUMERICAL DATA
OXIDATION
OXIDES
OXYGEN COMPOUNDS
REACTION KINETICS
SCALE CONTROL
SCRUBBING
SULFITES
SULFUR COMPOUNDS
WASTES