Characterization of carbide lime to identify sulfite oxidation inhibitors. Final report Sep 77-Jul 78
The report gives results of a study of carbide lime--a by-product of acetylene manufacture, primarily calcium hydroxide--used in a flue gas desulfurization (FGD) system at Louisville Gas and Electric (LGE). The study was undertaken to: identify sulfite ion oxidation inhibitors in carbide lime, and develop an analytical method for sulfite that avoids the interferences observed in analyzing scrubber liquors from LGE's FGD system. Thiosulfate was identified as the oxidation inhibitor in carbide lime; it was also identified (along with other reduced sulfur species) as a source of interference in the iodine titration method used at LGE for sulfite analysis. Bench-scale tests verified the presence of thiosulfate as a major inhibition to sulfite oxidation in simulated scrubber liquors. This means that the low oxidation rate (e.g., that reported at LGE with carbide lime) results in a greatly reduced tendency to calcium sulfate (gypsum) scaling, therefore a greatly improved FGD system reliability. The amount of thiosulfate required for scale-free scrubber operation is unknown. However, to bring the thiosulfate level of commercial lime up to that found in carbide lime would cost $1.50 per ton of lime (using sodium thiosulfate pentahydrate at $12 per 100 pounds). The ion chromatograph was found to be the best analytical tool for determining sulfite concentrations in carbide lime liquors.
- Research Organization:
- Radian Corp., Austin, TX (USA)
- OSTI ID:
- 6149456
- Report Number(s):
- PB-286646
- Country of Publication:
- United States
- Language:
- English
Similar Records
Studies of flue gas desulfurization at Lousiville Gas and Electric's Paddy's Run Station: Volume II. Review and analysis of commercial operations. Final report Mar 75-Feb 1978
Lime/limestone scrubber modifications: investigation of thiosulfate as an oxidation/scaling inhibitor. Part I, final report (general results)
Related Subjects
200202* -- Fossil-Fueled Power Plants-- Waste Management-- Noxious Gas & Particulate Emissions
ALKALINE EARTH METAL COMPOUNDS
ANTIOXIDANTS
CALCIUM COMPOUNDS
CALCIUM HYDROXIDES
CARBIDES
CARBON COMPOUNDS
CHEMICAL REACTIONS
COST
DESULFURIZATION
EQUIPMENT
FLUE GAS
GASEOUS WASTES
HYDROGEN COMPOUNDS
HYDROXIDES
OXIDATION
OXYGEN COMPOUNDS
PERFORMANCE
POLLUTION CONTROL EQUIPMENT
POWER PLANTS
SCRUBBERS
SULFITES
SULFUR COMPOUNDS
THERMAL POWER PLANTS
WASTES