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Simulation of Fe-Cr-X Alloy Exposed to an Oxyfuel Combustion Atmosphere at 600 °C

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Abstract

In coal-fired power plants using oxyfuel combustion process with carbon capture and sequestration, instead of air, a mixture of oxygen and recirculated flue gas is injected in the boiler. A series of steels were exposed to CO2-SO2-Ar-H2O gas mixtures at 600 °C for 1000 h to compare their high temperature corrosion behavior. During the corrosion process, carburization, decarburization and recrystallization were observed underneath the oxide scale depending on the gas mixture and alloy composition. The conditions that lead to carburization are not yet completely understood, but decarburization can be simulated using thermodynamic and kinetic models. In this work, the results of these simulations are compared with measured values for one of the alloys that displayed a decarburized region. Since the mobility of carbon in the scale is not known, two strategies were adopted: simulation of alloy-atmosphere contact; and estimation of the carbon flux to produce the observed decarburization. The second approach might give an insight on how permeable to carbon the scale is.

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Acknowledgments

The authors thank the PROBRAL Program, CAPES, CNPq, FAPERJ, DAAD and the BAM for supporting this research. The help of Eric Lass, at NIST, who arc melted and rolled the steel samples is gratefully acknowledged.

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Authors and Affiliations

  1. EEIMVR-UFF, Volta Redonda, RJ, 27255-125, Brazil

    André Costa e Silva

  2. PUC-Rio, Rua Marquês de São Vicente, 225, Rio de Janeiro, RJ, 22451-900, Brazil

    Daniel Coelho & Fernando Rizzo

  3. BAM, Unten den Eichen, 87, 12205, Berlin, Germany

    Axel Kranzmann & Fernando Rizzo

Authors
  1. André Costa e Silva
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  2. Daniel Coelho
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  3. Axel Kranzmann
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  4. Fernando Rizzo
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Correspondence to André Costa e Silva.

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Costa e Silva, A., Coelho, D., Kranzmann, A. et al. Simulation of Fe-Cr-X Alloy Exposed to an Oxyfuel Combustion Atmosphere at 600 °C. J. Phase Equilib. Diffus. 37, 19–24 (2016). https://doi.org/10.1007/s11669-015-0421-3

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  • DOI: https://doi.org/10.1007/s11669-015-0421-3

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