Distribution of high-temperature fireside deposits and corrosion in coal-fired boilers
In the pursuit of increased efficiency of electricity generation, there is wide interest in the generation of steam at higher temperatures than are currently employed. The concomitant higher steam tube metal temperatures lead to fears of significantly increased fireside corrosion rates, with the prospect of degradation in boiler reliability. An investigation of the potential for high-temperature corrosion problems was conducted in two boilers of the Electric Power Development Company, Ltd., in Japan. In addition to the existing superheaters and reheaters, ultra superheater sections in the subcritical boiler were operated at 595 and 620/sup 0/C. The coal burned contained 0.9-1.6% sulfur. Corrosion test probes were used to collect ash deposits and measure metal wastage throughout the supercritical boiler. Deposits also were obtained from heat exchange surfaces at similar points in the subcritical boiler. The compositions of the ash deposits at various points in the two boilers are shown. From results it was concluded that alloys with very high chromium contents are required for such high temperature boiler conditions. Coextrusion and chromizing offer practical means of achieving high surface chromium contents with ASME Code qualified alloys. 3 figures.
- OSTI ID:
- 5730291
- Journal Information:
- Mater. Compon. Fossil Energy Appl.; (United States), Vol. 67
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
BOILERS
CORROSION
CORROSION RESISTANT ALLOYS
FOULING
ASHES
CHEMICAL COMPOSITION
CHROMIUM ALLOYS
COAL
COMBUSTION
DEPOSITION
DEPOSITS
IRON OXIDES
JAPAN
MATERIALS TESTING
POTASSIUM OXIDES
SILICON OXIDES
SLAGS
SODIUM OXIDES
STAINLESS STEELS
SUPERHEATERS
ALKALI METAL COMPOUNDS
ALLOYS
ASIA
CARBONACEOUS MATERIALS
CHALCOGENIDES
CHEMICAL REACTIONS
ENERGY SOURCES
FOSSIL FUELS
FUELS
IRON ALLOYS
IRON BASE ALLOYS
IRON COMPOUNDS
MATERIALS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
POTASSIUM COMPOUNDS
RESIDUES
SILICON COMPOUNDS
SODIUM COMPOUNDS
STEELS
TESTING
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENT COMPOUNDS
014000* - Coal
Lignite
& Peat- Combustion