Effect of pressure and thermal cycling on long-term oxidation in supercritical CO2

B. A. Pint; J. R. Keiser

Effect of pressure and thermal cycling on long-term oxidation in supercritical CO₂

B. A. Pint, J. R. Keiser

Research output: Contribution to journal › Conference article › peer-review

1 Scopus citations

Abstract

Concentrating solar power (CSP) plant designers are interested in 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. Alloys N06625, N07740 and N07208 were evaluated in long-term exposures at 750°C using 500-h cycles in laboratory air, 1 bar industrial grade CO₂ and 300 bar supercritical CO₂, and using 10-h cycles in 1 bar CO₂ and O₂. Mass change data and quantification of the oxide scale thickness and depth of internal attack after 1,000-10,000 h exposures indicate that these materials are compatible with the sCO₂ environment at 750°C. Thermal cycling to simulate the solar duty cycle did not result in scale spallation after 15 kh and comparison of the 1 and 300 bar results did not show a significant effect of pressure on the reaction and no significant internal carburization was observed under these conditions.

Original language	English
Article number	12750
Journal	NACE - International Corrosion Conference Series
Volume	2019-March
State	Published - 2019
Event	Corrosion Conference and Expo 2019 - Nashville, United States Duration: Mar 24 2019 → Mar 28 2019

Funding

Regarding the effect of IG CO2 used in these experiments, companion experiments were conducted in 1 and 300 bar research grade (RG) CO2 with < 5ppm H2O and O247 (funded by the DOE Office of Fossil The authors would like to thank M. Howell, M. Stephens, G. Garner, T. M. Lowe and T. Jordan for assistance with the experimental work at ORNL. R. Pillai and M. J. Lance at ORNL provided helpful comments on the manuscript. This research was funded by the SunShot Initiative under the U.S. Department of Energy’s Office of Energy Efficiency and Renewable Energy, Solar Energy Technology Program: SuNLaMP award number DE-EE0001556. 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).

Keywords

Lifetime model
Supercritical carbon dioxide
Thermal cycling

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Cite this

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title = "Effect of pressure and thermal cycling on long-term oxidation in supercritical CO2",

abstract = "Concentrating solar power (CSP) plant designers are interested in 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. Alloys N06625, N07740 and N07208 were evaluated in long-term exposures at 750°C using 500-h cycles in laboratory air, 1 bar industrial grade CO2 and 300 bar supercritical CO2, and using 10-h cycles in 1 bar CO2 and O2. Mass change data and quantification of the oxide scale thickness and depth of internal attack after 1,000-10,000 h exposures indicate that these materials are compatible with the sCO2 environment at 750°C. Thermal cycling to simulate the solar duty cycle did not result in scale spallation after 15 kh and comparison of the 1 and 300 bar results did not show a significant effect of pressure on the reaction and no significant internal carburization was observed under these conditions.",

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AU - Pint, B. A.

AU - Keiser, J. R.

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N2 - Concentrating solar power (CSP) plant designers are interested in 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. Alloys N06625, N07740 and N07208 were evaluated in long-term exposures at 750°C using 500-h cycles in laboratory air, 1 bar industrial grade CO2 and 300 bar supercritical CO2, and using 10-h cycles in 1 bar CO2 and O2. Mass change data and quantification of the oxide scale thickness and depth of internal attack after 1,000-10,000 h exposures indicate that these materials are compatible with the sCO2 environment at 750°C. Thermal cycling to simulate the solar duty cycle did not result in scale spallation after 15 kh and comparison of the 1 and 300 bar results did not show a significant effect of pressure on the reaction and no significant internal carburization was observed under these conditions.

AB - Concentrating solar power (CSP) plant designers are interested in 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. Alloys N06625, N07740 and N07208 were evaluated in long-term exposures at 750°C using 500-h cycles in laboratory air, 1 bar industrial grade CO2 and 300 bar supercritical CO2, and using 10-h cycles in 1 bar CO2 and O2. Mass change data and quantification of the oxide scale thickness and depth of internal attack after 1,000-10,000 h exposures indicate that these materials are compatible with the sCO2 environment at 750°C. Thermal cycling to simulate the solar duty cycle did not result in scale spallation after 15 kh and comparison of the 1 and 300 bar results did not show a significant effect of pressure on the reaction and no significant internal carburization was observed under these conditions.

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