Corrosion and carburization of superheater materials in oxyfuel combustion

Satu Tuurna, Sanni Yli-Olli, Pekka Pohjanne

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

    Abstract

    The energy sector is globally the largest CO2 emitter. Carbon capture and storage (CCS) is a concept to reduce greenhouse gas emissions resulting from the use of fossil fuels in power generation, and integrated oxyfuel combustion concepts, combustion in oxygen-enriched environment to make post-combustion extraction easier, is studied one of the options for CCS. Oxyfuel combustion can be expected to differ from combustion in air by e.g. modified distribution of fireside temperatures, much reduced NOx but increased levels of fireside CO2, SO2 and water levels due to extensive flue gas recirculation. Increased flue gas recirculation may increase the concentration of a number of contaminants in the deposited ash and promote fouling and corrosion. In addition to development of low CO2 emitting energy generation technologies, improved energy efficiency is essential in order to reach emission reduction targets. Increasing process efficiency requires high in-service temperatures for superheaters and reheaters. In this paper the corrosion performance of two superheater austenitic steels (TP347HFG and Sanicro 25) has been studied in laboratory tests under simulated oxyfuel conditions with and without a synthetic deposits (85 CaCO3 - 15 wt% CaSO4, CaSO4-0.55 wt% KCl) at 650 and 720°C up to 1000 hours.
    Original languageEnglish
    Title of host publicationBaltica IX. International Conference on Life Management and Maintenance for Power Plants
    EditorsPertti Auerkari, Juha Veivo
    Place of PublicationEspoo
    PublisherVTT Technical Research Centre of Finland
    Pages527-537
    ISBN (Print)978-951-38-8025-5, 978-951-38-8026-2
    Publication statusPublished - 2013
    MoE publication typeA4 Article in a conference publication
    EventBALTICA IX - International Conference on Life Management and Maintenance for Power Plants - Helsinki-Stockholm, Finland
    Duration: 11 Jun 201313 Jun 2013

    Publication series

    SeriesVTT Technology
    Number106
    ISSN2242-1211

    Conference

    ConferenceBALTICA IX - International Conference on Life Management and Maintenance for Power Plants
    CountryFinland
    CityHelsinki-Stockholm
    Period11/06/1313/06/13

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    Cite this

    Tuurna, S., Yli-Olli, S., & Pohjanne, P. (2013). Corrosion and carburization of superheater materials in oxyfuel combustion. In P. Auerkari, & J. Veivo (Eds.), Baltica IX. International Conference on Life Management and Maintenance for Power Plants (pp. 527-537). VTT Technical Research Centre of Finland. VTT Technology, No. 106