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Comparison of Recuperator Alloy Degradation in Laboratory and Engine Testing

[+] Author Affiliations
Bruce A. Pint, Karren L. More, Rosa Trejo, Edgar Lara-Curzio

Oak Ridge National Laboratory, Oak Ridge, TN

Paper No. GT2006-90194, pp. 217-224; 8 pages
doi:10.1115/GT2006-90194
From:
  • ASME Turbo Expo 2006: Power for Land, Sea, and Air
  • Volume 5: Marine; Microturbines and Small Turbomachinery; Oil and Gas Applications; Structures and Dynamics, Parts A and B
  • Barcelona, Spain, May 8–11, 2006
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 0-7918-4240-1 | eISBN: 0-7918-3774-2
  • Copyright © 2006 by ASME

abstract

In order to increase the efficiency of advanced microturbines, durable alloy foils are needed for their recuperators to operate at 650°–700°C. Prior work has demonstrated that water vapor in the exhaust gas causes more rapid consumption of Cr from austenitic alloys leading to a reduction in lifetime for the thin-walled components in this application. New commercial alloy foils are being tested in both laboratory tests in humid air and in the exhaust gas of a modified 60kW microturbine. Initial results are presented for a commercial batch of 80μm alloy 120 foil. The Cr consumption rates in laboratory testing were similar to those observed in previous testing. The initial results from the microturbine indicate a faster Cr consumption rate compared to the laboratory test but longer term results are needed to quantify the difference. These results will help to verify a Cr consumption model for predicting lifetimes in this environment based on classical gas transport theory.

Copyright © 2006 by ASME
Topics: Alloys , Engines , Testing

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