Seminole Electric FGD study reveals corrosion mechanisms, duct material performance
This article describes how once the corrosion rates of the materials used in the construction of scrubbers are known, specifying for longevity becomes an easier task. To properly evaluate the corrosion resistance of the materials used to fabricate the ducts, dampers, structural supports and other elements of a particular system, a testing scheme that systematically exposes material samples to the many environments representing areas of varying corrosivity is ideal. Because the exact composition, pH, and temperature of liquids and vapors in these areas are usually not known, gathering and analyzing samples of these elements is a prudent part of a systems' evaluation. Field testing of this type was conducted at the Seminole Generating Station which consists of two 650-MW coal-fired electric generating units that typically burn western Kentucky and eastern Illinois sub-bituminous coal with a sulfur content up to 3% and a 0.2%--0.3% chloride content. The plant has a typical wet limestone FGD system that sprays a solution of crushed limestone downward in a vertical rubber-lined scrubber module against a rising flue gas flow stream. There are five parallel scrubber modules available and a direct chimney bypass line that is used only during start up or during emergency conditions. Specially-welded test panels containing four different alloys and two weld filler metals were used in the field tests.
- OSTI ID:
- 7047328
- Journal Information:
- Power Engineering; (United States), Vol. 98:12; ISSN 0032-5961
- Country of Publication:
- United States
- Language:
- English
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POLLUTION CONTROL EQUIPMENT
CORROSION
SULFUR DIOXIDE
AIR POLLUTION CONTROL
DESULFURIZATION
CHALCOGENIDES
CHEMICAL REACTIONS
CONTROL
EQUIPMENT
OXIDES
OXYGEN COMPOUNDS
POLLUTION CONTROL
SULFUR COMPOUNDS
SULFUR OXIDES
200202* - Fossil-Fueled Power Plants- Waste Management- Noxious Gas & Particulate Emissions
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