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 journalArticleScientificpeer-review

    8 Citations (Scopus)
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    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 CO2, 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 CO2 + 1%O2 + 0.25%H2O 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 languageUndefined/Unknown
    Pages (from-to)1400–1409
    JournalMaterials and Corrosion / Werkstoffe und Korrosion
    Volume70
    Issue number8
    DOIs
    Publication statusPublished - 2019
    MoE publication typeA1 Journal article-refereed

    Keywords

    • Impurity effects
    • Compability
    • Structural alloys
    • Supercritical CO2

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