The durability of candidate heat-transfer and structural support materials for high-temperature service in a fluidized bed environment was investigated in Battelle's 61 cm [24 in.] diameter combustor operating at atmospheric pressure with high-sulfur coal and limestone. Stainless steels and nickel-base and cobalt-base alloys for heat transfer were exposed on corrosion probes at 593 to 860 C [1100 to 1580 F] for periods of 10 hours, 500 hours, and 1500 hours. Structural support alloys were exposed at the bed temperature of 882 C [1620 F] for 1080 hours. The best performance was obtained with Types 310 and 347 stainless steel and FSX 414 as cooled tubes in the fluidized bed, these same alloys plus USS 18-18-2 as cooled tubes in the freeboard, and Incoloy 825 uncooled in the fluidized bed.

Subject
Materials, Stainless alloys, Probes, Tubes, Oxide layers, Metal wastage, Corrosion attacks, Fluidized beds, Metals, Scale formation, Deposit corrosion, Stainless steel, Alloys
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1982
Association for Materials Protection and Performance (AMPP)
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