Coal-ash corrosion in superheaters and reheaters

Conference · Fri Jan 01 04:00:00 EST 1988

OSTI ID:5622713

Blough, J L; Kihara, S

Coal-ash corrosion is one of the major hurdles to be overcome if the improved coal-fired power plant is to succeed. This paper describes the major variables affecting coal-ash corrosion and provides laboratory corrosion data generated with various levels of SO/sub 2/ and alkali sulfates. The corrosion rate increases as SO/sub 2/ and alkali-sulfate concentration increase. As previously observed, the corrosion rate experiences a bell-shaped curve with respect to temperature (i.e., increases with rising temperature to a maximum and then decreases). The work that is the subject of this paper showed that the bell-shaped curve shifts to a higher temperature than previously reported and varies with different alloys. The valuable isocorrosion curve was developed to provide a mass of predicting the corrosion rate for various SO/sub 2/, alkali-sulfate, and temperature combinations.

• OSTI ID: 5622713
• Report Number(s): CONF-880314--
• Country of Publication: United States
• Language: English

Related Subjects

20 FOSSIL-FUELED POWER PLANTS
200104* -- Fossil-Fueled Power Plants-- Components
36 MATERIALS SCIENCE
360105 -- Metals & Alloys-- Corrosion & Erosion
AEROSOL WASTES
ALKALI METAL COMPOUNDS
ALLOYS
ASHES
CHALCOGENIDES
CHEMICAL REACTIONS
COAL FINES
CORROSION
CORROSION RESISTANT ALLOYS
CORROSIVE EFFECTS
FLY ASH
FOSSIL-FUEL POWER PLANTS
HEATERS
OXIDES
OXYGEN COMPOUNDS
POWER PLANTS
RESIDUES
SULFATES
SULFUR COMPOUNDS
SULFUR CONTENT
SULFUR DIOXIDE
SULFUR OXIDES
SUPERHEATERS
THERMAL POWER PLANTS
WASTES