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

Robert G. Brese; James R. Keiser; Bruce A. Pint

doi:10.1007/s11085-017-9762-0

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

Robert G. Brese, James R. Keiser, Bruce A. Pint

Research output: Contribution to journal › Article › peer-review

23 Scopus citations

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.

Original language	English
Pages (from-to)	631-642
Number of pages	12
Journal	Oxidation of Metals
Volume	87
Issue number	5-6
DOIs	https://doi.org/10.1007/s11085-017-9762-0
State	Published - Jun 1 2017

Funding

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 ). 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/sCO 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. 2

Keywords

Brayton cycle
CSP
Nickel alloys
sCO

Access to Document

10.1007/s11085-017-9762-0

Cite this

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title = "Effect of Thermal Cycling on Compatibility in CO2 for Concentrated Solar Power Applications",

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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AB - 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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