Scale suppression in lime/limestone FGD systems

Conference · Thu Mar 01 04:00:00 EST 1979 · Am. Chem. Soc., Div. Pet. Chem., Prepr.; (United States)

OSTI ID:6790236

Rosenberg, H S; Grotta, H M

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-
• Conference Information: Journal Name: Am. Chem. Soc., Div. Pet. Chem., Prepr.; (United States) Journal Volume: 24:2
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
320305* -- Energy Conservation
Consumption
&amp; Utilization-- Industrial &amp; 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