Effect of pressure and impurities on oxidation in supercritical CO2

A1 Journal article (refereed)


Internal Authors/Editors


Publication Details

List of Authors: Bruce A. Pint, Juho Lehmusto, Michael J. Lance, James R. Keiser
Publisher: WILEY‐VCH Verlag GmbH & Co.
Place: Weinheim
Publication year: 2019
Journal: Materials and Corrosion / Werkstoffe und Korrosion
Journal acronym: Mater. Corros.
Volume number: 70
Issue number: 8
Start page: 1400
End page: 1409


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.


Keywords

Compability, Impurity effects, Structural alloys, Supercritical CO2

Last updated on 2019-15-09 at 05:36