Effect of Impurities on the Compatibility of Steels in Supercritical CO2 at 450°–650°C

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

doi:10.1115/1.4064585

Effect of Impurities on the Compatibility of Steels in Supercritical CO₂ at 450°–650°C

Journal Article · Mon Mar 11 00:00:00 EDT 2024 · Journal of Engineering for Gas Turbines and Power

DOI:https://doi.org/10.1115/1.4064585· OSTI ID:2326305

Pint, Bruce A. ^[1]; Lance, Michael J. ^[1]; ^[1]; Keiser, James R. ^[1]

Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

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. In conclusion, bulk C content was strongly increased at 650 °C but not at 450° or 550 °C.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Fossil Energy and Carbon Management (FECM)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 2326305

Journal Information:: Journal of Engineering for Gas Turbines and Power, Journal Name: Journal of Engineering for Gas Turbines and Power Journal Issue: 9 Vol. 146; ISSN 0742-4795

Publisher:: ASMECopyright Statement

Country of Publication:: United States

Language:: English

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