Four nickel alloys and two stainless steels were tested as steam generator tubes in an experimental fluidized-bed combustor. The Morgantown Energy Technology Center, of the United States Department of Energy, operates a small, 460-mm (18-inch) diameter, fluidized-bed combustor to test materials and equipment and to study the dynamics of a hot operating fluidized bed. As a part of the materials testing, tubes of several materials were installed as in-bed heat exchangers where they were exposed to the bed environment for 1,200 hours of actual fluidized-bed operations and to an additional 400 hours of combustor heating and cooling. During the operations, the tubes were exposed to both low- and high-sulfur fuels. Bed materials used in the different tests were limestone, dolomite, or high-silica sand. The tubes were cooled by water or by steam and tube metal temperatures varied from 20° to 590°C (68° to 1,100°F). Removal and examination of the tubes revealed that all of the metals were attacked by the sulfidizing environment with severity of attack generally increasing with nickel content.

Subject
Materials, Piping, Stainless alloys, Nickel based alloys, Tubes, Molybdenum alloys, Photomicrographs, Copper alloys, Corrosion attacks, Heat exchangers, Stainless steel, Titanium alloys, Alloys
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1983
Association for Materials Protection and Performance (AMPP)
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