EFFECT OF IMPURITIES ON THE COMPATIBILITY OF STEELS IN SUPERCRITICAL CO2 AT 450°-650°C

Bruce A. Pint; Michael J. Lance; Rishi Pillai; James R. Keiser

doi:10.1115/GT2023-103838

EFFECT OF IMPURITIES ON THE COMPATIBILITY OF STEELS IN SUPERCRITICAL CO₂ AT 450°-650°C

Bruce A. Pint, Michael J. Lance, Rishi Pillai, James R. Keiser

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

Abstract

Direct-fired supercritical CO₂ (sCO₂) power cycles are a pathway to low-CO₂ fossil energy but contain high levels of O₂ and H₂O in the sCO₂. The effect of impurities on structural steels was investigated at 450°-650°C in 300 bar sCO₂. The test matrix included 9 and 12%Cr ferritic-martensitic (FM) steels and conventional and advanced austenitic steels exposed for 1000-2000 h with and without additions of 1%O₂ and 0.1%H₂O to simulate the cycle after water removal. For FM steels, the mass gains and scale thicknesses were similar with and without impurities with the formation of thick, duplex Fe-rich scales in all cases including the observation that Fe₂O₃ only formed with 1%O₂. For the austenitic steels, higher mass gains were observed at all temperatures with increased formation of Fe-rich oxides when impurities were added. Carbon ingress was assessed by bulk combustion analysis, glow discharge optical emission spectroscopy and measuring post-exposure room temperature tensile properties. Bulk C content was strongly increased at 650°C but not at 450° or 550°C.

Original language	English
Title of host publication	Supercritical CO2
Publisher	American Society of Mechanical Engineers (ASME)
ISBN (Electronic)	9780791887073
DOIs	https://doi.org/10.1115/GT2023-103838
State	Published - 2023
Event	ASME Turbo Expo 2023: Turbomachinery Technical Conference and Exposition, GT 2023 - Boston, United States Duration: Jun 26 2023 → Jun 30 2023

Publication series

Name	Proceedings of the ASME Turbo Expo
Volume	12

Conference

Conference	ASME Turbo Expo 2023: Turbomachinery Technical Conference and Exposition, GT 2023
Country/Territory	United States
City	Boston
Period	06/26/23 → 06/30/23

Funding

The authors would like to thank EPRI for supplying the VM12 material, Tenaris for supplying T91 and S. Sham at INL for the 709 material from the ASME code case project. At ORNL, B. Johnston, M. Howell, T. M. Lowe, K. L. Hedrick and V. Cox for assistance with the experimental work. Y.-F. Su and M. Ridley provided helpful comments on the manuscript. This research was sponsored by the U.S. Department of Energy, Office of Fossil Energy and Carbon Management, Crosscutting Technology Program. 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).

Funders	Funder number
Crosscutting Technology Program	DE-AC05-00OR22725
DOE Public Access Plan
United States Government
U.S. Department of Energy
Electric Power Research Institute
Office of Fossil Energy and Carbon Management
Bureau of International Narcotics and Law Enforcement Affairs

Keywords

Experimental Work
High Pressure Testing
High Temperature Materials
Oxidation

UN SDGs

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

Access to Document

10.1115/GT2023-103838

Cite this

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title = "EFFECT OF IMPURITIES ON THE COMPATIBILITY OF STEELS IN SUPERCRITICAL CO2 AT 450°-650°C",

abstract = "Direct-fired supercritical CO2 (sCO2) power cycles are a pathway to low-CO2 fossil energy but contain high levels of O2 and H2O in the sCO2. The effect of impurities on structural steels was investigated at 450°-650°C in 300 bar sCO2. The test matrix included 9 and 12%Cr ferritic-martensitic (FM) steels and conventional and advanced austenitic steels exposed for 1000-2000 h with and without additions of 1%O2 and 0.1%H2O to simulate the cycle after water removal. For FM steels, the mass gains and scale thicknesses were similar with and without impurities with the formation of thick, duplex Fe-rich scales in all cases including the observation that Fe2O3 only formed with 1%O2. For the austenitic steels, higher mass gains were observed at all temperatures with increased formation of Fe-rich oxides when impurities were added. Carbon ingress was assessed by bulk combustion analysis, glow discharge optical emission spectroscopy and measuring post-exposure room temperature tensile properties. Bulk C content was strongly increased at 650°C but not at 450° or 550°C.",

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author = "Pint, {Bruce A.} and Lance, {Michael J.} and Rishi Pillai and Keiser, {James R.}",

note = "Publisher Copyright: Copyright {\textcopyright} 2023 by The United States Government.; ASME Turbo Expo 2023: Turbomachinery Technical Conference and Exposition, GT 2023 ; Conference date: 26-06-2023 Through 30-06-2023",

year = "2023",

doi = "10.1115/GT2023-103838",

language = "English",

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Pint, BA , Lance, MJ , Pillai, R & Keiser, JR 2023, EFFECT OF IMPURITIES ON THE COMPATIBILITY OF STEELS IN SUPERCRITICAL CO₂ AT 450°-650°C. in Supercritical CO2., v012t28a027, Proceedings of the ASME Turbo Expo, vol. 12, American Society of Mechanical Engineers (ASME), ASME Turbo Expo 2023: Turbomachinery Technical Conference and Exposition, GT 2023, Boston, United States, 06/26/23. https://doi.org/10.1115/GT2023-103838

EFFECT OF IMPURITIES ON THE COMPATIBILITY OF STEELS IN SUPERCRITICAL CO₂ AT 450°-650°C. / Pint, Bruce A.; Lance, Michael J.; Pillai, Rishi et al.
Supercritical CO2. American Society of Mechanical Engineers (ASME), 2023. v012t28a027 (Proceedings of the ASME Turbo Expo; Vol. 12).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

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