Thiosulfate as an oxidation inhibitor in flue-gas desulfurization processes: a review of R and D results
The article describes the pilot-plant testing of sodium thiosulfate (Na/sub 2/S/sub 2/O/sub 3/) as an oxidation inhibitor in flue gas desulfurization by lime and limestone slurry scrubbing with and without MgO and adipic acid additives. The effectiveness of thiosulfate is proportional to the inhibitor product, defined as the product of thiosulfate concentration (M), calcium concentration (M), and the moles of SO/sub 2/ absorbed per hour per liter of hold tank volume. Gypsum saturation was less than 100% and scaling was eliminated when the inhibitor product exceeded 0.3 x 10/sup -6/ M/sup 3/ hr. Thiosulfate was relatively more effective in systems with chlorides and less effective in systems promoted by MgO. An inhibitor product greater than 10/sup -6/ M/sup 3//hr significantly enhanced dewatering of solids from limestone scrubbing. SO/sub 2/ removal and/or limestone utilization were increased in systems that started with less than 10 mM dissolved calcium.
- Research Organization:
- Environmental Protection Agency, Research Triangle Park, NC (USA). Air and Energy Engineering Research Lab.
- OSTI ID:
- 6439693
- Report Number(s):
- PB-87-167730/XAB; EPA-600/J-86/277
- Country of Publication:
- United States
- Language:
- English
Similar Records
Pilot testing of sodium thiosulfate
Pilot testing of sodium thiosulfate
Related Subjects
010800* -- Coal
Lignite
& Peat-- Waste Management
010900 -- Coal
Lignite
& Peat-- Environmental Aspects
500200 -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
AIR POLLUTION ABATEMENT
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
CALCIUM COMPOUNDS
CALCIUM SULFATES
CARBONACEOUS MATERIALS
CHALCOGENIDES
CHEMICAL REACTIONS
COAL
COMBUSTORS
DESULFURIZATION
ENERGY SOURCES
FLUE GAS
FOSSIL FUELS
FUELS
GASEOUS WASTES
GYPSUM
LIME-LIMESTONE WET SCRUBBING PROCESSES
MATERIALS
MINERALS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
POLLUTION ABATEMENT
REMOVAL
SCRUBBING
SODIUM COMPOUNDS
SULFATE MINERALS
SULFATES
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
THIOSULFATES
WASTES
WATER REMOVAL