Corrosion performance of materials in coal-combustion environments
- Argonne National Lab., IL (United States)
Reliability of components and long-term trouble-free performance of structural materials are essential in power-generating processes that utilize coal as a feedstock. The combustion environments encompass a wide range of oxygen partial pressures, form 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 concern from the systems standpoint is the aggressiveness of the combustion environment toward 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 simulate 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 additions, the protective capacity of the oxide scale in resisting further corrosion seems to degrade in the presence of both sulfur and chlorine.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 140142
- Report Number(s):
- ORNL/FMP-93/1; CONF-9305135-; ON: DE94001091; TRN: 93:003927-0037
- Resource Relation:
- Conference: 7. annual conference on fossil energy materials, Oak Ridge, TN (United States), 11-13 May 1993; Other Information: PBD: Jul 1993; Related Information: Is Part Of Proceedings of the Seventh Annual Conference on Fossil Energy Materials; Fossil Energy AR and TD Materials Program; Cole, N.C.; Judkins, R.R. [comps.]; PB: 402 p.
- Country of Publication:
- United States
- Language:
- English
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Corrosion performance of materials in coal-combustion environments
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