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:10.1115/1.4064585

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: Contribution to journal › Article › peer-review

2 Scopus citations

Abstract

Direct-fired supercritical CO₂ (sCO₂) power cycles are a pathway to low-CO₂ fossil energy but contain O₂ and H₂O in the sCO₂ from combustion. The effect of impurities on structural steels was investigated at 450^∘-650 ^∘C in 30 MPa 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 (GDOES) and measuring postexposure room temperature tensile properties. Bulk C content was strongly increased at 650 ^∘C but not at 450^∘ or 550 ^∘C.

Original language	English
Article number	091007
Journal	Journal of Engineering for Gas Turbines and Power
Volume	146
Issue number	9
DOIs	https://doi.org/10.1115/1.4064585
State	Published - Sep 1 2024

Funding

U.S. Department of Energy, Office of Fossil Energy and Carbon Management, Advanced Materials Program, Field Work Proposal FEAA144. 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 paper. This research was sponsored by the U.S. Department of Energy, Office of Fossil Energy and Carbon Management, Advanced Materials Program.

Keywords

experimental work
high pressure testing
high temperature materials
oxidation

Access to Document

10.1115/1.4064585

Cite this

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abstract = "Direct-fired supercritical CO2 (sCO2) power cycles are a pathway to low-CO2 fossil energy but contain O2 and H2O in the sCO2 from combustion. The effect of impurities on structural steels was investigated at 450∘-650 ∘C in 30 MPa 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 (GDOES) and measuring postexposure room temperature tensile properties. Bulk C content was strongly increased at 650 ∘C but not at 450∘ or 550 ∘C.",

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AB - Direct-fired supercritical CO2 (sCO2) power cycles are a pathway to low-CO2 fossil energy but contain O2 and H2O in the sCO2 from combustion. The effect of impurities on structural steels was investigated at 450∘-650 ∘C in 30 MPa 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 (GDOES) and measuring postexposure room temperature tensile properties. Bulk C content was strongly increased at 650 ∘C but not at 450∘ or 550 ∘C.

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