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Effect of Pressure and Thermal Cycling on Long-Term Oxidation in Supercritical CO2

Next generation concentrating solar power (CSP) plants may employ supercritical CO2 (sCO2) for the power block to achieve 50% electrical efficiency at 700°C. The goal of this project was to develop a long-term (100 kh) lifetime model for sCO2 compatibility using 10-15 kh laboratory exposures. Nickel-base alloys 740H 282 and 625 and Fe-base austenitic alloy 25 were evaluated in 500-h cycles at 1 and 300 bar and 1-h and 10-h cycles in 1 bar industrial grade CO2. All of the alloys have shown low mass gains in 500-h cycles after 10000 h exposures similar to exposures in laboratory air. However alloy 25 showed accelerated mass gain after ~1500 h of cumulative exposure in 10-h cycles at 700° and 750°C and 1-h cycles at 750°C. The Cr-rich oxide broke down allowing Fe-rich oxide formation. Characterization of the reaction products as a function of time will be presented. Research sponsored by the U.S. Department of Energy Office of Energy Efficiency and Renewable Energy Solar Energy Technology Office.

Product Number: 51319-12750-SG
Author: Bruce Pint
Publication Date: 2019
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