Evaluation of supercritical oxidation resistance of boiler tube materials

Sanni Yli-Olli, Satu Tuurna, Sami Penttilä, Pertti Auerkari, Edgardo Coda Zabetta, Kyösti Vänskä

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

1 Citation (Scopus)

Abstract

To improve the efficiency of fossil fuel power plants the operating temperatures and pressures have a need to be increased. However, at high temperatures the steam side oxidation resistance becomes a critical issue for the steels used especially at the final stages of superheaters and reheaters. Apart from the chemical composition of the material, surface condition is a major factor affecting the oxidation resistance in steam and supercritical water. In this paper, stainless boiler steels (UNS S34710, S31035, S31042, S30942) are investigated in elevated steam oxidation conditions. Tests were conducted in a supercritical water autoclave environment (250 bar, with 125 ppb dissolved oxygen and a pH of 7) at 625°C, 650°C and 675°C for up to 1000h. Materials were tested with different surface finishes shot peened, milled and spark eroded. The results show an influence of surface finish on the early stages of oxidation. Oxides formed on more rough surfaces were more adherent, and thinner than on a ground surface. Tested materials with a chromium over 20 wt-% showed similar oxidation behavior at the lowest temperature, though oxides formed were dependent on the small alloying agents (Cu, Mn). More variation could be seen with increasing temperature.
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
Pages791-802
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

oxidation
steel
oxide
fossil fuel
chromium
dissolved oxygen
power plant
temperature
chemical composition
material
evaluation
boiler
water

Keywords

  • steam oxidation
  • boiler tube materials
  • surface finish

Cite this

Yli-Olli, S., Tuurna, S., Penttilä, S., Auerkari, P., Coda Zabetta, E., & Vänskä, K. (2014). Evaluation of supercritical oxidation resistance of boiler tube materials. In Advances in Materials Technology for Fossil Power Plants: Proceedings from the Seventh International Conference (pp. 791-802). Electric Power Research Institute.
Yli-Olli, Sanni ; Tuurna, Satu ; Penttilä, Sami ; Auerkari, Pertti ; Coda Zabetta, Edgardo ; Vänskä, Kyösti. / Evaluation of supercritical oxidation resistance of boiler tube materials. Advances in Materials Technology for Fossil Power Plants: Proceedings from the Seventh International Conference. Electric Power Research Institute, 2014. pp. 791-802
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abstract = "To improve the efficiency of fossil fuel power plants the operating temperatures and pressures have a need to be increased. However, at high temperatures the steam side oxidation resistance becomes a critical issue for the steels used especially at the final stages of superheaters and reheaters. Apart from the chemical composition of the material, surface condition is a major factor affecting the oxidation resistance in steam and supercritical water. In this paper, stainless boiler steels (UNS S34710, S31035, S31042, S30942) are investigated in elevated steam oxidation conditions. Tests were conducted in a supercritical water autoclave environment (250 bar, with 125 ppb dissolved oxygen and a pH of 7) at 625°C, 650°C and 675°C for up to 1000h. Materials were tested with different surface finishes shot peened, milled and spark eroded. The results show an influence of surface finish on the early stages of oxidation. Oxides formed on more rough surfaces were more adherent, and thinner than on a ground surface. Tested materials with a chromium over 20 wt-{\%} showed similar oxidation behavior at the lowest temperature, though oxides formed were dependent on the small alloying agents (Cu, Mn). More variation could be seen with increasing temperature.",
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Yli-Olli, S, Tuurna, S, Penttilä, S, Auerkari, P, Coda Zabetta, E & Vänskä, K 2014, Evaluation of supercritical oxidation resistance of boiler tube materials. in Advances in Materials Technology for Fossil Power Plants: Proceedings from the Seventh International Conference. Electric Power Research Institute, pp. 791-802, 7th International Conference on Advances in Materials Technology for Fossil Power Plants, Waikoloa, United States, 22/10/13.

Evaluation of supercritical oxidation resistance of boiler tube materials. / Yli-Olli, Sanni; Tuurna, Satu; Penttilä, Sami; Auerkari, Pertti; 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. 791-802.

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

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AU - Penttilä, Sami

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AU - Vänskä, Kyösti

N1 - Project code: 74023

PY - 2014

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N2 - To improve the efficiency of fossil fuel power plants the operating temperatures and pressures have a need to be increased. However, at high temperatures the steam side oxidation resistance becomes a critical issue for the steels used especially at the final stages of superheaters and reheaters. Apart from the chemical composition of the material, surface condition is a major factor affecting the oxidation resistance in steam and supercritical water. In this paper, stainless boiler steels (UNS S34710, S31035, S31042, S30942) are investigated in elevated steam oxidation conditions. Tests were conducted in a supercritical water autoclave environment (250 bar, with 125 ppb dissolved oxygen and a pH of 7) at 625°C, 650°C and 675°C for up to 1000h. Materials were tested with different surface finishes shot peened, milled and spark eroded. The results show an influence of surface finish on the early stages of oxidation. Oxides formed on more rough surfaces were more adherent, and thinner than on a ground surface. Tested materials with a chromium over 20 wt-% showed similar oxidation behavior at the lowest temperature, though oxides formed were dependent on the small alloying agents (Cu, Mn). More variation could be seen with increasing temperature.

AB - To improve the efficiency of fossil fuel power plants the operating temperatures and pressures have a need to be increased. However, at high temperatures the steam side oxidation resistance becomes a critical issue for the steels used especially at the final stages of superheaters and reheaters. Apart from the chemical composition of the material, surface condition is a major factor affecting the oxidation resistance in steam and supercritical water. In this paper, stainless boiler steels (UNS S34710, S31035, S31042, S30942) are investigated in elevated steam oxidation conditions. Tests were conducted in a supercritical water autoclave environment (250 bar, with 125 ppb dissolved oxygen and a pH of 7) at 625°C, 650°C and 675°C for up to 1000h. Materials were tested with different surface finishes shot peened, milled and spark eroded. The results show an influence of surface finish on the early stages of oxidation. Oxides formed on more rough surfaces were more adherent, and thinner than on a ground surface. Tested materials with a chromium over 20 wt-% showed similar oxidation behavior at the lowest temperature, though oxides formed were dependent on the small alloying agents (Cu, Mn). More variation could be seen with increasing temperature.

KW - steam oxidation

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BT - Advances in Materials Technology for Fossil Power Plants

PB - Electric Power Research Institute

ER -

Yli-Olli S, Tuurna S, Penttilä S, Auerkari P, Coda Zabetta E, Vänskä K. Evaluation of supercritical oxidation resistance of boiler tube materials. In Advances in Materials Technology for Fossil Power Plants: Proceedings from the Seventh International Conference. Electric Power Research Institute. 2014. p. 791-802