Evaluation of supercritical oxidation resistance of boiler tube materials

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

Evaluation of supercritical oxidation resistance of boiler tube materials

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

Amec Foster Wheeler, Finland

Research output: Chapter in Book/Report/Conference proceeding › Conference article in proceedings › Scientific › peer-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 language	English
Title of host publication	Advances in Materials Technology for Fossil Power Plants
Subtitle of host publication	Proceedings from the Seventh International Conference (EPRI 2013)
Editors	D. Gandy, J. Shingledecker
Publisher	ASM International
Pages	791-802
ISBN (Print)	978-1-62708-060-6
Publication status	Published - 2014
MoE publication type	A4 Article in a conference publication
Event	7th International Conference on Advances in Materials Technology for Fossil Power Plants - Waikoloa, United States Duration: 22 Oct 2013 → 25 Oct 2013 Conference number: 7

Conference

Conference	7th International Conference on Advances in Materials Technology for Fossil Power Plants
Country/Territory	United States
City	Waikoloa
Period	22/10/13 → 25/10/13

Keywords

steam oxidation
boiler tube materials
surface finish

Cite this

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title = "Evaluation of supercritical oxidation resistance of boiler tube materials",

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.",

keywords = "steam oxidation, boiler tube materials, surface finish",

author = "Sanni Yli-Olli and Satu Tuurna and Sami Penttil{\"a} and Pertti Auerkari and {Coda Zabetta}, Edgardo and Ky{\"o}sti V{\"a}nsk{\"a}",

note = "Project code: 74023; 7th International Conference on Advances in Materials Technology for Fossil Power Plants ; Conference date: 22-10-2013 Through 25-10-2013",

year = "2014",

language = "English",

isbn = "978-1-62708-060-6",

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editor = "D. Gandy and J. Shingledecker",

booktitle = "Advances in Materials Technology for Fossil Power Plants",

publisher = "ASM International",

address = "United States",

}

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 D Gandy & J Shingledecker (eds), Advances in Materials Technology for Fossil Power Plants: Proceedings from the Seventh International Conference (EPRI 2013). ASM International, pp. 791-802, 7th International Conference on Advances in Materials Technology for Fossil Power Plants, Waikoloa, Hawaii, United States, 22/10/13.

Evaluation of supercritical oxidation resistance of boiler tube materials. / Yli-Olli, Sanni; Tuurna, Satu; Penttilä, Sami et al.

Advances in Materials Technology for Fossil Power Plants: Proceedings from the Seventh International Conference (EPRI 2013). ed. / D. Gandy; J. Shingledecker. ASM International, 2014. p. 791-802.

Research output: Chapter in Book/Report/Conference proceeding › Conference article in proceedings › Scientific › peer-review

TY - GEN

T1 - Evaluation of supercritical oxidation resistance of boiler tube materials

AU - Yli-Olli, Sanni

AU - Tuurna, Satu

AU - Penttilä, Sami

AU - Auerkari, Pertti

AU - Coda Zabetta, Edgardo

AU - Vänskä, Kyösti

N1 - Conference code: 7

PY - 2014

Y1 - 2014

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

KW - boiler tube materials

KW - surface finish

UR - https://www.asminternational.org/search/-/journal_content/56/10192/05440G/PUBLICATION

M3 - Conference article in proceedings

SN - 978-1-62708-060-6

SP - 791

EP - 802

BT - Advances in Materials Technology for Fossil Power Plants

A2 - Gandy, D.

A2 - Shingledecker, J.

PB - ASM International

T2 - 7th International Conference on Advances in Materials Technology for Fossil Power Plants

Y2 - 22 October 2013 through 25 October 2013

ER -

Evaluation of supercritical oxidation resistance of boiler tube materials

Abstract

Conference

Keywords

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