Corrosion performance of materials in coal-combustion environments
Reliability of components and long-term trouble-free performance of structural materials are essential for the acceptance of power-generating process that utilize coal as a feedstock- The combustion environments encompass a wide range of oxygen partial pressures, from excess-air conditions in conventional systems to air-deficient conditions in low-NO[sub x] systems. Apart from the environmental aspects of the effluent from coal combustion, one of the concerns from the systems standpoint is the aggressiveness of the combustion environment toward the boiler structural components such as waterwall tubes and steam superheaters. The corrosion tests in this program address the combined effect of sulfur and chlorine on the corrosion response of several ASME-coded and noncoded boiler materials exposed to air-deficient and excess-air combustion conditions. Thermodynamic calculations were made to evaluate the gas chemistries that will arise from combustion of coals. The results of such calculations, coupled with oxygen-sulfur-chlorine thermochemical diagrams, were used to select gas environments for the laboratory test program. Tests were conducted at 400 and 650[degrees]C to stimulate the waterwall and superheater environments, respectively, in pulverized-coal-fired boilers. Experimental results obtained thus far indicate that both sulfur and chlorine can accelerate corrosion of ferritic and austenitic alloys; in addition, the protective capacity of the oxide scale in resisting further corrosion seems to degrade in the presence of both sulfur and chlorine.
- Research Organization:
- Argonne National Lab., IL (United States). Materials and Components Technology Div.
- Sponsoring Organization:
- USDOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 6543546
- Report Number(s):
- ANL/MCT/CP-79047; CONF-9305135-2; ON: DE93012904
- Resource Relation:
- Conference: 7. annual conference on fossil energy materials, Oak Ridge, TN (United States), 11-13 May 1993
- Country of Publication:
- United States
- Language:
- English
Similar Records
Corrosion performance of materials in coal-combustion environments
Corrosion performance of structural alloys in oxygen/sulfur/chlorine-containing environments.
Related Subjects
01 COAL, LIGNITE, AND PEAT
36 MATERIALS SCIENCE
BOILERS
CORROSION
CHLORINE COMPOUNDS
CORROSIVE EFFECTS
COAL
COMBUSTION
SULFUR COMPOUNDS
CHEMISTRY
MATERIALS
SUPERHEATERS
THERMOCHEMICAL DIAGRAMS
THERMODYNAMICS
TUBES
CARBONACEOUS MATERIALS
CHEMICAL REACTIONS
DIAGRAMS
ENERGY SOURCES
FOSSIL FUELS
FUELS
HALOGEN COMPOUNDS
OXIDATION
THERMOCHEMICAL PROCESSES
200104* - Fossil-Fueled Power Plants- Components
014000 - Coal
Lignite
& Peat- Combustion
360105 - Metals & Alloys- Corrosion & Erosion