Effect of pressure and impurities on oxidation in supercritical CO2

Bruce A. Pint; Juho Lehmusto; Michael J. Lance; James R. Keiser

doi:10.1002/maco.201810652

Effect of pressure and impurities on oxidation in supercritical CO₂

Bruce A. Pint, Juho Lehmusto, Michael J. Lance, James R. Keiser

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

46 Scopus citations

Abstract

Both indirect- and direct-fired supercritical CO₂ cycles for high-efficiency power generation are expected to have impurities that may greatly alter the compatibility of Fe- and Ni-based structural alloys in these environments. Recent work has attempted to quantify reaction rates at 750°C in simulated laboratory environments with controlled impurity levels at ambient pressure, as well as under supercritical conditions (30 MPa). With low impurity levels in research and industrial-grade CO ₂, pressure appeared to have only a limited effect on oxide thickness and internal oxidation and reaction products were similar to those formed in laboratory air. However, a direct-fired simulation at 750°C/30 MPa in CO ₂ + 1%O ₂ + 0.25%H ₂O has found an increased mass gain and characterization after 2,500-hr exposures have found thicker reaction products, especially for Fe-based alloys. At these impurity levels, pressure may have a significant effect on the role of impurities.

Original language	English
Pages (from-to)	1400-1409
Number of pages	10
Journal	Materials and Corrosion
Volume	70
Issue number	8
DOIs	https://doi.org/10.1002/maco.201810652
State	Published - Aug 2019

Funding

The authors would like to thank M. Howell, M. Stephens, T. M. Lowe, R. G. Brese, and T. Jordan for assistance with the experimental work. Material was provided by Haynes International, Sandvik Special Metals, and Capstone Turbine, Corp. S. S. Raiman and R. Pillai provided helpful comments on the manuscript. This study was sponsored by the U.S. Department of Energy, Office of Fossil Energy, Crosscutting Technology Program and the Office of Energy Efficiency and Renewable Energy, Solar Energy Technology Program: SuNLaMP award number DE‐EE0001556. JL was supported by the Academy of Finland project “Novel Approaches to Study Corrosion Mechanisms in High‐temperature Industrial Processes” (Decision No. 296435). This manuscript has been authored by UT‐Battelle, LLC under Contract No. DE‐ AC05‐00OR22725 with the US Department of Energy. The US government retains and the publisher, by accepting the article for publication, acknowledges that the US government retains a nonexclusive, paid‐up, irrevocable, worldwide license to publish or reproduce the published form of this manuscript, or allow others to do so, for US 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 authors would like to thank M. Howell, M. Stephens, T. M. Lowe, R. G. Brese, and T. Jordan for assistance with the experimental work. Material was provided by Haynes International, Sandvik Special Metals, and Capstone Turbine, Corp. S. S. Raiman and R. Pillai provided helpful comments on the manuscript. This study was sponsored by the U.S. Department of Energy, Office of Fossil Energy, Crosscutting Technology Program and the Office of Energy Efficiency and Renewable Energy, Solar Energy Technology Program: SuNLaMP award number DE-EE0001556. JL was supported by the Academy of Finland project ?Novel Approaches to Study Corrosion Mechanisms in High-temperature Industrial Processes? (Decision No. 296435). This manuscript has been authored by UT-Battelle, LLC under Contract No. DE-AC05-00OR22725 with the US Department of Energy. The US government retains and the publisher, by accepting the article for publication, acknowledges that the US government retains a nonexclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this manuscript, or allow others to do so, for US 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
DOE Public Access Plan
Haynes International
Sandvik Special Metals, and Capstone Turbine
U.S. Department of Energy
Solar Energy Technologies Program	DE‐EE0001556
Office of Fossil Energy
Office of Energy Efficiency and Renewable Energy
Suomen Akatemia	296435

Keywords

compatibility
impurity effects
structural alloys
supercritical CO

Access to Document

10.1002/maco.201810652

Cite this

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title = "Effect of pressure and impurities on oxidation in supercritical CO2",

abstract = "Both indirect- and direct-fired supercritical CO2 cycles for high-efficiency power generation are expected to have impurities that may greatly alter the compatibility of Fe- and Ni-based structural alloys in these environments. Recent work has attempted to quantify reaction rates at 750°C in simulated laboratory environments with controlled impurity levels at ambient pressure, as well as under supercritical conditions (30 MPa). With low impurity levels in research and industrial-grade CO 2, pressure appeared to have only a limited effect on oxide thickness and internal oxidation and reaction products were similar to those formed in laboratory air. However, a direct-fired simulation at 750°C/30 MPa in CO 2 + 1%O 2 + 0.25%H 2O has found an increased mass gain and characterization after 2,500-hr exposures have found thicker reaction products, especially for Fe-based alloys. At these impurity levels, pressure may have a significant effect on the role of impurities.",

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

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