Fireside corrosion and carburization of superheater materials in simulated oxyfuel combustion conditions

Satu Tuurna, Pekka Pohjanne, Sanni Yli-Olli, Edgardo Coda Zabetta, Kyösti Vänskä

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

    1 Citation (Scopus)

    Abstract

    Oxyfuel combustion is considered as one of the most promising technologies to facilitate CO2 capture from flue gases. In oxyfuel combustion, the fuel is burned in a mixture of oxygen and recirculated flue gas. Flue gas recirculation increases the levels of fireside CO2, SO2, Cl and moisture, and thus promotes fouling and corrosion. In this paper the corrosion performance of two superheater austenitic stainless steels (UNS S34710 and S31035) and one Ni base alloy (UNS N06617) has been determined in laboratory tests under simulated oxyfuel conditions with and without a synthetic carbonate based deposits (CaCO3 - 15 wt% CaSO4, CaCO3 - 14wt% CaSO4 - 1 KCl) at 650 and 720°C up to 1000 hours. No carburization of the metal substrate was observed after exposure to simulated oxyfuel gas atmospheres without deposit, although some carbon enrichment was detected near the oxide metal interface. At 720°C a very thin oxide formed on all alloy surfaces while the weight changes were negative. This negative weight change observed is due to chromium evaporation in the moist testing condition. At the presence of deposits, corrosion accelerated and considerable metal loss of austenitic alloys was observed at 720°C. In addition, clear carburization of austenitic steel UNS S34710 occurred.
    Original languageEnglish
    Title of host publicationAdvances in Materials Technology for Fossil Power Plants
    Subtitle of host publicationProceedings from the Seventh International Conference
    PublisherElectric Power Research Institute
    Pages881-891
    ISBN (Print)978-1-62708-060-6
    Publication statusPublished - 2014
    MoE publication typeA4 Article in a conference publication
    Event7th International Conference on Advances in Materials Technology for Fossil Power Plants - Waikoloa, United States
    Duration: 22 Oct 201325 Oct 2013
    Conference number: 7

    Conference

    Conference7th International Conference on Advances in Materials Technology for Fossil Power Plants
    CountryUnited States
    CityWaikoloa
    Period22/10/1325/10/13

    Keywords

    • oxyfuel combustion
    • corrosion
    • carburization
    • high temperature

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  • Cite this

    Tuurna, S., Pohjanne, P., Yli-Olli, S., Coda Zabetta, E., & Vänskä, K. (2014). Fireside corrosion and carburization of superheater materials in simulated oxyfuel combustion conditions. In Advances in Materials Technology for Fossil Power Plants: Proceedings from the Seventh International Conference (pp. 881-891). Electric Power Research Institute.