Abstract
Hydrogen-fueled microturbines are being considered as part of the future green microgrid. However, the use of hydrogen as a fuel presents new challenges for selection and development of suitable high temperature materials for hydrogen combustion. The burning of hydrogen is expected to result in higher operating temperatures and higher than typically observed water vapor contents in exhaust gases versus burning natural gas. In this work, foil specimens of various Fe- and Ni-based alloys were oxidized in air þ 10% H2O and air þ 60% H2O for up to 5000 h at 700 ◦C to simulate the exhaust atmosphere of natural gas and hydrogen-fueled microturbines. The impact of alloy composition and water vapor content on the oxidation/volatilization induced loss of wall thickness was experimentally evaluated. Enhanced external oxidation and volatilization of Cr2O3 and Ti-doped Cr2O3 scales were observed in air þ 60% H2O compared to air þ 10% H2O. No significant impact of the higher water vapor content was observed on Al2O3 scales formed on Fe-based alumina-forming austenitic alloys. Lifetime modeling was employed to predict the combined effects of water vapor content, gas flow rates, temperature, and alloy composition on the oxidation-induced lifetime of the investigated materials.
| Original language | English |
|---|---|
| Article number | 041010 |
| Journal | Journal of Engineering for Gas Turbines and Power |
| Volume | 146 |
| Issue number | 4 |
| DOIs | |
| State | Published - Apr 1 2024 |
Funding
The authors sincerely thank J. Wade, M. Stephens, T. Lowe, and D. Newberry for assistance with the experimental work and metallography preparations and characterization at ORNL. V. Deodeshmukh, S. Dryepondt, and H. Hattendorf are acknowledged for providing the 282, AFA, and 602CA foils, respectively. The authors sincerely thank M. Ridley and D. Sulejmanovic for providing valuable comments on the paper. This research was sponsored by the U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy, Combined Heat and Power Program. Notice: This paper has been authored by UT-Battelle, LLC under Contract No. DE-AC05-00OR22725 with the U.S. Department of Energy. The United States Government retains and the publisher, by accepting the article for publication, acknowledges that the United States Government retains a nonexclusive, paid-up, irrevocable, world-wide license to publish or reproduce the published form of this paper, or allow others to do so, for United States Government purposes. The Department of Energy will provide public access to these results of federally sponsored research in accordance with the DOE PUBLIC ACCESS PLAN1.
Keywords
- foil oxidation
- lifetime
- microturbine
- water vapor
