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

Fingerprint

Superheaters
Flue gases
Deposits
Corrosion
Metals
Oxides
Austenitic steel
Austenitic stainless steel
Fouling
Carbonates
Chromium
Evaporation
Moisture
Carbon
Oxygen
Testing
Substrates
Gases

Keywords

  • oxyfuel combustion
  • corrosion
  • carburization
  • high temperature

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.
Tuurna, Satu ; Pohjanne, Pekka ; Yli-Olli, Sanni ; Coda Zabetta, Edgardo ; Vänskä, Kyösti. / Fireside corrosion and carburization of superheater materials in simulated oxyfuel combustion conditions. Advances in Materials Technology for Fossil Power Plants: Proceedings from the Seventh International Conference. Electric Power Research Institute, 2014. pp. 881-891
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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.",
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author = "Satu Tuurna and Pekka Pohjanne and Sanni Yli-Olli and {Coda Zabetta}, Edgardo and Ky{\"o}sti V{\"a}nsk{\"a}",
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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. Electric Power Research Institute, pp. 881-891, 7th International Conference on Advances in Materials Technology for Fossil Power Plants, Waikoloa, United States, 22/10/13.

Fireside corrosion and carburization of superheater materials in simulated oxyfuel combustion conditions. / Tuurna, Satu; Pohjanne, Pekka; Yli-Olli, Sanni; Coda Zabetta, Edgardo; Vänskä, Kyösti.

Advances in Materials Technology for Fossil Power Plants: Proceedings from the Seventh International Conference. Electric Power Research Institute, 2014. p. 881-891.

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

TY - GEN

T1 - Fireside corrosion and carburization of superheater materials in simulated oxyfuel combustion conditions

AU - Tuurna, Satu

AU - Pohjanne, Pekka

AU - Yli-Olli, Sanni

AU - Coda Zabetta, Edgardo

AU - Vänskä, Kyösti

N1 - Project code: 74023

PY - 2014

Y1 - 2014

N2 - 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.

AB - 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.

KW - oxyfuel combustion

KW - corrosion

KW - carburization

KW - high temperature

M3 - Conference article in proceedings

SN - 978-1-62708-060-6

SP - 881

EP - 891

BT - Advances in Materials Technology for Fossil Power Plants

PB - Electric Power Research Institute

ER -

Tuurna S, Pohjanne P, Yli-Olli S, Coda Zabetta E, Vänskä K. 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. Electric Power Research Institute. 2014. p. 881-891