Corrosion of Heat-Exchange Tubes in a Simulated Coal-Fired MHD System

[+] Author and Article Information
D. Bienstock, R. J. Demski, R. C. Corey

Bureau of Mines, U. S. Department of the Interior, Pittsburgh Energy Research Center, Pittsburgh, Pa.

J. Eng. Power 93(2), 249-256 (Apr 01, 1971) (8 pages) doi:10.1115/1.3445556 History: Received July 29, 1970; Online July 14, 2010


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 deg 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 deg F and exposed to products of combustion at 1800–2500 deg 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 deg F in combustion gas at 2500 deg F; the stainless steels 310, 316, and 446 were resistant at a metal temperature of 1100 deg F in gas at 2100 deg F; carbon steel was attacked at 800 deg F wall temperature and 1800 deg F flue gas.

Copyright © 1971 by ASME
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