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Effect of Thermal Cycling on Compatibility in CO2 for Concentrated Solar Power Applications

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Abstract

As a first step in evaluating materials for a concentrated solar power (CSP), supercritical CO2 Brayton cycle, experiments are being conducted to simulate the daily operating cycle using 10-h thermal cycles in 1 bar CO2 at 700–800 °C. After 1000-h exposures, the mass gains for commercial Ni-base alloys 740H, 282, 625 and Fe-base alloy 25 were relatively low with correspondingly thin reaction products. At 800 °C, similar reaction products were obtained for thermal cycling in CO2 and dry air, which also could simulate the outside of the primary heat exchanger. In addition, 500-h cycles were conducted at 750 °C, which showed slightly higher mass gains than the 10-h cycles. In general, there were no indications of internal carburization for these four alloys after 1000 h and the measured rate constants are sufficiently low to meet the 30-year CSP lifetime goal.

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Acknowledgements

The experimental work at ORNL was conducted by G. Garner, M. Stephens, T. Lowe and T. Jordan. P. F. Tortorelli provided useful comments on the manuscript. The authors appreciate the contributions of our research team members: Brayton Energy, LLC, Special Metals, Haynes International and Sandvik and the input of others from the CSP/sCO2 industry. This research was funded by the SunShot Initiative under the US Department of Energy’s Office of Energy Efficiency and Renewable Energy, Solar Energy Technology Program: SuNLaMP Award Number DE-EE0001556.

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Correspondence to Robert G. Brese or Bruce A. Pint.

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This manuscript 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 non-exclusive, paid-up, irrevocable, world-wide license to publish or reproduce the published form of this manuscript, 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 Plan (http://energy.gov/downloads/doe-public-access-plan).

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Brese, R.G., Keiser, J.R. & Pint, B.A. Effect of Thermal Cycling on Compatibility in CO2 for Concentrated Solar Power Applications. Oxid Met 87, 631–642 (2017). https://doi.org/10.1007/s11085-017-9762-0

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