Life assessment for vintage boilers

Pertti Auerkari, Jorma Salonen, Stefan Holmström, Leila Laaksonen, Ulla McNiven, Olli Lehtinen, Sari Mäkinen, Ville Väänänen, Reino Nikkarila

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientific

Abstract

The high temperature sections of power and combined heat and power (CHP) boilers are designed for some de facto expected but finite life. Several significant damage mechanisms must be taken into account, particularly in superheaters and reheaters that are designed for creep but also suffer from thermal degradation, external erosion and corrosion, and internal steam oxidation that will gradually increase the metal temperature. As rising temperature tends to accelerate all damage mechanisms, major effects can be expected from the internal oxide growth. The feedback loop is taken into account in procedures to predict superheater life from known tube dimensions, time in operation, and other initial data. The oxide effect can be mitigated by internal cleaning, but in-service spallation of a relatively thick internal oxide can also become significant in old plants. Spallation can create problems but extends the tube life by keeping the wall cooler than with an adherent oxide. Examples are shown for boilers with more than 150 000 h of service.
Original languageEnglish
Title of host publicationBaltica VIII
Subtitle of host publicationLife Management and Maintenance for Power Plants
Place of PublicationEspoo
PublisherVTT Technical Research Centre of Finland
Pages78-89
Volume2
ISBN (Electronic)978-951-38-7594-7
ISBN (Print)978-951-38-7593-2
Publication statusPublished - 2010
MoE publication typeB3 Non-refereed article in conference proceedings
EventBALTICA VIII - International Conference on Life Management and Maintenance for Power Plants - Helsinki-Stockholm, Finland
Duration: 18 May 201020 May 2010

Publication series

NameVTT Symposium
PublisherVTT
Number265
ISSN (Print)0357–9387
ISSN (Electronic)1455–0873

Conference

ConferenceBALTICA VIII - International Conference on Life Management and Maintenance for Power Plants
CountryFinland
CityHelsinki-Stockholm
Period18/05/1020/05/10

Fingerprint

Boilers
Superheaters
Oxides
Temperature
Erosion
Cleaning
Creep
Pyrolysis
Steam
Corrosion
Feedback
Oxidation
Metals

Cite this

Auerkari, P., Salonen, J., Holmström, S., Laaksonen, L., McNiven, U., Lehtinen, O., ... Nikkarila, R. (2010). Life assessment for vintage boilers. In Baltica VIII: Life Management and Maintenance for Power Plants (Vol. 2, pp. 78-89). Espoo: VTT Technical Research Centre of Finland. VTT Symposium, No. 265
Auerkari, Pertti ; Salonen, Jorma ; Holmström, Stefan ; Laaksonen, Leila ; McNiven, Ulla ; Lehtinen, Olli ; Mäkinen, Sari ; Väänänen, Ville ; Nikkarila, Reino. / Life assessment for vintage boilers. Baltica VIII: Life Management and Maintenance for Power Plants. Vol. 2 Espoo : VTT Technical Research Centre of Finland, 2010. pp. 78-89 (VTT Symposium; No. 265).
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title = "Life assessment for vintage boilers",
abstract = "The high temperature sections of power and combined heat and power (CHP) boilers are designed for some de facto expected but finite life. Several significant damage mechanisms must be taken into account, particularly in superheaters and reheaters that are designed for creep but also suffer from thermal degradation, external erosion and corrosion, and internal steam oxidation that will gradually increase the metal temperature. As rising temperature tends to accelerate all damage mechanisms, major effects can be expected from the internal oxide growth. The feedback loop is taken into account in procedures to predict superheater life from known tube dimensions, time in operation, and other initial data. The oxide effect can be mitigated by internal cleaning, but in-service spallation of a relatively thick internal oxide can also become significant in old plants. Spallation can create problems but extends the tube life by keeping the wall cooler than with an adherent oxide. Examples are shown for boilers with more than 150 000 h of service.",
author = "Pertti Auerkari and Jorma Salonen and Stefan Holmstr{\"o}m and Leila Laaksonen and Ulla McNiven and Olli Lehtinen and Sari M{\"a}kinen and Ville V{\"a}{\"a}n{\"a}nen and Reino Nikkarila",
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Auerkari, P, Salonen, J, Holmström, S, Laaksonen, L, McNiven, U, Lehtinen, O, Mäkinen, S, Väänänen, V & Nikkarila, R 2010, Life assessment for vintage boilers. in Baltica VIII: Life Management and Maintenance for Power Plants. vol. 2, VTT Technical Research Centre of Finland, Espoo, VTT Symposium, no. 265, pp. 78-89, BALTICA VIII - International Conference on Life Management and Maintenance for Power Plants, Helsinki-Stockholm, Finland, 18/05/10.

Life assessment for vintage boilers. / Auerkari, Pertti; Salonen, Jorma; Holmström, Stefan; Laaksonen, Leila; McNiven, Ulla; Lehtinen, Olli; Mäkinen, Sari; Väänänen, Ville; Nikkarila, Reino.

Baltica VIII: Life Management and Maintenance for Power Plants. Vol. 2 Espoo : VTT Technical Research Centre of Finland, 2010. p. 78-89 (VTT Symposium; No. 265).

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientific

TY - GEN

T1 - Life assessment for vintage boilers

AU - Auerkari, Pertti

AU - Salonen, Jorma

AU - Holmström, Stefan

AU - Laaksonen, Leila

AU - McNiven, Ulla

AU - Lehtinen, Olli

AU - Mäkinen, Sari

AU - Väänänen, Ville

AU - Nikkarila, Reino

PY - 2010

Y1 - 2010

N2 - The high temperature sections of power and combined heat and power (CHP) boilers are designed for some de facto expected but finite life. Several significant damage mechanisms must be taken into account, particularly in superheaters and reheaters that are designed for creep but also suffer from thermal degradation, external erosion and corrosion, and internal steam oxidation that will gradually increase the metal temperature. As rising temperature tends to accelerate all damage mechanisms, major effects can be expected from the internal oxide growth. The feedback loop is taken into account in procedures to predict superheater life from known tube dimensions, time in operation, and other initial data. The oxide effect can be mitigated by internal cleaning, but in-service spallation of a relatively thick internal oxide can also become significant in old plants. Spallation can create problems but extends the tube life by keeping the wall cooler than with an adherent oxide. Examples are shown for boilers with more than 150 000 h of service.

AB - The high temperature sections of power and combined heat and power (CHP) boilers are designed for some de facto expected but finite life. Several significant damage mechanisms must be taken into account, particularly in superheaters and reheaters that are designed for creep but also suffer from thermal degradation, external erosion and corrosion, and internal steam oxidation that will gradually increase the metal temperature. As rising temperature tends to accelerate all damage mechanisms, major effects can be expected from the internal oxide growth. The feedback loop is taken into account in procedures to predict superheater life from known tube dimensions, time in operation, and other initial data. The oxide effect can be mitigated by internal cleaning, but in-service spallation of a relatively thick internal oxide can also become significant in old plants. Spallation can create problems but extends the tube life by keeping the wall cooler than with an adherent oxide. Examples are shown for boilers with more than 150 000 h of service.

M3 - Conference article in proceedings

SN - 978-951-38-7593-2

VL - 2

T3 - VTT Symposium

SP - 78

EP - 89

BT - Baltica VIII

PB - VTT Technical Research Centre of Finland

CY - Espoo

ER -

Auerkari P, Salonen J, Holmström S, Laaksonen L, McNiven U, Lehtinen O et al. Life assessment for vintage boilers. In Baltica VIII: Life Management and Maintenance for Power Plants. Vol. 2. Espoo: VTT Technical Research Centre of Finland. 2010. p. 78-89. (VTT Symposium; No. 265).