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Title: Effect of pressure and impurities on oxidation in supercritical CO 2

Abstract

Both indirect- and direct-fired supercritical CO 2 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.

Authors:
ORCiD logo [1];  [1]; ORCiD logo [1]; ORCiD logo [1]
  1. ORNL
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Fossil Energy (FE); USDOE Office of Energy Efficiency and Renewable Energy (EERE)
OSTI Identifier:
1546526
DOE Contract Number:  
AC05-00OR22725
Resource Type:
Conference
Resource Relation:
Conference: EFC Workshop - Frankfurt, Frankfurt, Germany, 9/26/2018-9/28/2018
Country of Publication:
United States
Language:
English

Citation Formats

Pint, Bruce A., Lehmusto, Juho T., Lance, Michael J., and Keiser, James. Effect of pressure and impurities on oxidation in supercritical CO2. United States: N. p., 2019. Web.
Pint, Bruce A., Lehmusto, Juho T., Lance, Michael J., & Keiser, James. Effect of pressure and impurities on oxidation in supercritical CO2. United States.
Pint, Bruce A., Lehmusto, Juho T., Lance, Michael J., and Keiser, James. Mon . "Effect of pressure and impurities on oxidation in supercritical CO2". United States. https://www.osti.gov/servlets/purl/1546526.
@article{osti_1546526,
title = {Effect of pressure and impurities on oxidation in supercritical CO2},
author = {Pint, Bruce A. and Lehmusto, Juho T. and Lance, Michael J. and Keiser, James},
abstractNote = {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.},
doi = {},
url = {https://www.osti.gov/biblio/1546526}, journal = {},
number = ,
volume = ,
place = {United States},
year = {2019},
month = {4}
}

Conference:
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