Evaluating the effect of cold work on supercritical oxidation of boiler tube materials

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

Abstract

For higher efficiency and competitive overall performance, it would be an advantage to be able to safely exceed the highest operational values, currently up to about 600-620°C/25-30 MPa in supercritical (SC) boiler plants. Under such operating conditions the oxidation resistance in SC water tends to limit the potential for further improvement of efficiency. The way to increase the oxidation resistance of traditional austenitic boiler tubes e.g. TP 347H is to do additional cold work on the boiler tube inner surface. In the current paper the effect of cold work on the oxidation resistance of TP347H and TP347HFG has been evaluated by shot peened samples with different parameters and subjecting those samples to supercritical oxidation exposure. The results show an improvement in the oxidation resistance of the alloys, especially in the large grained alloy TP347H. Also the uniformity of the deformation layer was seen to have an influence on the oxidation resistance, since the oxide nodules start to grow at locations with the thinnest or no deformation layer.
Original languageEnglish
Title of host publicationAdvances in Materials Technology for Fossil Power Plants, Proceedings from the Eighth International Conference (EPRI 2016)
PublisherASM International
Pages823-831
ISBN (Print)978-162-70813-1-3, 162-70813-1-3
Publication statusPublished - 2016
MoE publication typeA4 Article in a conference publication
Event8th International Conference on Advances in Materials Technology for Fossil Power Plants - Algarve, Portugal
Duration: 10 Oct 201614 Oct 2016

Conference

Conference8th International Conference on Advances in Materials Technology for Fossil Power Plants
CountryPortugal
CityAlgarve
Period10/10/1614/10/16

Fingerprint

Oxidation resistance
Boilers
Oxidation
Oxides
Water

Keywords

  • boiler tube material
  • shot peening
  • steam oxidation
  • surface treatment

Cite this

Yli-Olli, S., Tuurna, S., Auerkari, P., & Penttilä, S. (2016). Evaluating the effect of cold work on supercritical oxidation of boiler tube materials. In Advances in Materials Technology for Fossil Power Plants, Proceedings from the Eighth International Conference (EPRI 2016) (pp. 823-831). ASM International.
Yli-Olli, Sanni ; Tuurna, Satu ; Auerkari, Pertti ; Penttilä, Sami. / Evaluating the effect of cold work on supercritical oxidation of boiler tube materials. Advances in Materials Technology for Fossil Power Plants, Proceedings from the Eighth International Conference (EPRI 2016) . ASM International, 2016. pp. 823-831
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Yli-Olli, S, Tuurna, S, Auerkari, P & Penttilä, S 2016, Evaluating the effect of cold work on supercritical oxidation of boiler tube materials. in Advances in Materials Technology for Fossil Power Plants, Proceedings from the Eighth International Conference (EPRI 2016) . ASM International, pp. 823-831, 8th International Conference on Advances in Materials Technology for Fossil Power Plants, Algarve, Portugal, 10/10/16.

Evaluating the effect of cold work on supercritical oxidation of boiler tube materials. / Yli-Olli, Sanni; Tuurna, Satu; Auerkari, Pertti; Penttilä, Sami.

Advances in Materials Technology for Fossil Power Plants, Proceedings from the Eighth International Conference (EPRI 2016) . ASM International, 2016. p. 823-831.

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

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T1 - Evaluating the effect of cold work on supercritical oxidation of boiler tube materials

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AU - Auerkari, Pertti

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PY - 2016

Y1 - 2016

N2 - For higher efficiency and competitive overall performance, it would be an advantage to be able to safely exceed the highest operational values, currently up to about 600-620°C/25-30 MPa in supercritical (SC) boiler plants. Under such operating conditions the oxidation resistance in SC water tends to limit the potential for further improvement of efficiency. The way to increase the oxidation resistance of traditional austenitic boiler tubes e.g. TP 347H is to do additional cold work on the boiler tube inner surface. In the current paper the effect of cold work on the oxidation resistance of TP347H and TP347HFG has been evaluated by shot peened samples with different parameters and subjecting those samples to supercritical oxidation exposure. The results show an improvement in the oxidation resistance of the alloys, especially in the large grained alloy TP347H. Also the uniformity of the deformation layer was seen to have an influence on the oxidation resistance, since the oxide nodules start to grow at locations with the thinnest or no deformation layer.

AB - For higher efficiency and competitive overall performance, it would be an advantage to be able to safely exceed the highest operational values, currently up to about 600-620°C/25-30 MPa in supercritical (SC) boiler plants. Under such operating conditions the oxidation resistance in SC water tends to limit the potential for further improvement of efficiency. The way to increase the oxidation resistance of traditional austenitic boiler tubes e.g. TP 347H is to do additional cold work on the boiler tube inner surface. In the current paper the effect of cold work on the oxidation resistance of TP347H and TP347HFG has been evaluated by shot peened samples with different parameters and subjecting those samples to supercritical oxidation exposure. The results show an improvement in the oxidation resistance of the alloys, especially in the large grained alloy TP347H. Also the uniformity of the deformation layer was seen to have an influence on the oxidation resistance, since the oxide nodules start to grow at locations with the thinnest or no deformation layer.

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KW - surface treatment

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Yli-Olli S, Tuurna S, Auerkari P, Penttilä S. Evaluating the effect of cold work on supercritical oxidation of boiler tube materials. In Advances in Materials Technology for Fossil Power Plants, Proceedings from the Eighth International Conference (EPRI 2016) . ASM International. 2016. p. 823-831