Literature review of FGD construction materials. Final report. [Extension of EPRI-CS-1736; 237 references]
A survey of the literature was performed on Corrosion Related Failures in Flue Gas Desulfurization Systems. It was found that pitting and crevice corrosion of alloys occurred throughout scrubbers and were the major cause of failure. Stress-corrosion cracking failures were found in the prescrubber and in the reheater while erosion-corrosion failures occurred most frequently in the prescrubber. Pitting and crevice corrosion were associated with the presence of chlorides and low pH conditions while these factors, in conjunction with higher temperatures, appeared to be responsible for the occurrence of stress-corrosion cracking. Erosion-corrosion failures were associated with high velocities and the presence of particulates in the incoming flue gas. Failures of organic linings occurred primarily as a result of debonding, caused by temperature upsets, and, occasionally, as a result of improper application. Erosion-corrosion failures of organic linings also were reported. Failures of inorganic linings have occurred as a result of improper materials selection and permeability to aqueous solutions. Solutions to these problems generally are dependent upon the specific application. The nickel-base alloys that contain molybdenum are highly resistant to pitting, crevice corrosion, erosion-corrosion and stress-corrosion cracking, but are expensive and difficult to fabricate. Recently developed organic coatings, such as the fluoroelastomers, are much more tolerant of temperature upsets than are the organic coatings that are commonly used, but the former are difficult to successfully apply. Acid resistant bricks and mortars are much more resistant to attack in scrubbers than are calcium aluminate concrete and mortars or Portland cement. However, protection of the underlying carbon steel support structure continues to be a problem with inorganic linings.
- Research Organization:
- Battelle Columbus Labs., OH (USA)
- OSTI ID:
- 6759520
- Report Number(s):
- EPRI-CS-2533; ON: DE82906484
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
01 COAL, LIGNITE, AND PEAT
CHLORIDES
CORROSIVE EFFECTS
FLUE GAS
DESULFURIZATION
FLUORIDES
NICKEL BASE ALLOYS
CORROSION RESISTANCE
SCRUBBERS
CORROSION
MATERIALS
MATERIALS TESTING
PROTECTIVE COATINGS
STAINLESS STEELS
EROSION
EXPERIMENTAL DATA
FOSSIL-FUEL POWER PLANTS
LIME-LIMESTONE WET SCRUBBING PROCESSES
LINERS
PH VALUE
PITTING CORROSION
STRESS CORROSION
ALLOYS
CHEMICAL REACTIONS
CHLORINE COMPOUNDS
CHROMIUM ALLOYS
COATINGS
CORROSION RESISTANT ALLOYS
DATA
EQUIPMENT
FLUORINE COMPOUNDS
GASEOUS WASTES
HALIDES
HALOGEN COMPOUNDS
INFORMATION
IRON ALLOYS
IRON BASE ALLOYS
NICKEL ALLOYS
NUMERICAL DATA
POLLUTION CONTROL EQUIPMENT
POWER PLANTS
SCRUBBING
STEELS
TESTING
THERMAL POWER PLANTS
WASTES
200202* - Fossil-Fueled Power Plants- Waste Management- Noxious Gas & Particulate Emissions
360105 - Metals & Alloys- Corrosion & Erosion
010800 - Coal
Lignite
& Peat- Waste Management