Corrosion of heat-exchange tubes in a simulated coal-fired MHD system
An experimental unit was built to burn 125 lb of coal an hour at 4000 deg F in a cyclone burner with oxygen-enriched air preheated to 1500/sup 0/F to ascertain the fireside corrosion problems that might be encountered in the coal-fired MHD generation of power. Potassium carbonate was added to the coal at seed concentrations that would be expected in an MHD combustor. Tubes having a metal composition used in conventional steam generators, and also having a range of alloy compositions that might have potential use in an MHD system, were maintained at surface temperatures of 800-1500/sup 0/F and exposed to products of combustion of 1800-2500/sup 0/F. The seeded flue gas was generally more corrosive than the unseeded. In tests up to 100-hr duration. Haynes 25 was slightly attacked at a wall temperature of 1500/sup 0/F in combustion gas at 2500/sup 0/F; the stainless steels 310, 316, and 446 were resistant at a metal temperature of 1100/sup 0/F in gas at 2100/sup 0/F; carbon steel was attacked at 800/sup 0/F wall temperature and 1800/sup 0/F flue gas.
- OSTI ID:
- 7223357
- Report Number(s):
- CONF-701110-6
- Resource Relation:
- Conference: ASME winter annual meeting, New York, NY, USA, 30 Nov 1970; Related Information: ASME Paper No. 70-WA/CD-3
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
CARBON STEELS
CORROSION RESISTANCE
COAL-FIRED MHD GENERATORS
HEAT EXCHANGERS
MATERIALS
COMBUSTION PRODUCTS
CORROSIVE EFFECTS
HAYNES 25 ALLOY
STAINLESS STEEL-310
STAINLESS STEEL-316
STAINLESS STEEL-446
ASHES
BURNERS
CORROSION
CORROSION PROTECTION
FLUE GAS
PLASMA SEEDING
POTASSIUM CARBONATES
TEST FACILITIES
TUBES
ALKALI METAL COMPOUNDS
ALLOYS
CARBON COMPOUNDS
CARBONATES
CHEMICAL REACTIONS
CHROMIUM ALLOYS
CHROMIUM STEELS
CHROMIUM-NICKEL STEELS
COBALT ALLOYS
COBALT BASE ALLOYS
CORROSION RESISTANT ALLOYS
DIRECT ENERGY CONVERTERS
GASEOUS WASTES
HEAT RESISTING ALLOYS
IRON ALLOYS
IRON BASE ALLOYS
MHD GENERATORS
MOLYBDENUM ALLOYS
NICKEL ALLOYS
OXYGEN COMPOUNDS
POTASSIUM COMPOUNDS
RESIDUES
STAINLESS STEELS
STEELS
TUNGSTEN ALLOYS
WASTES
300103* - MHD Generators- Materials
Components
& Auxiliaries
360105 - Metals & Alloys- Corrosion & Erosion