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

    SeriesVTT Symposium
    Number265
    ISSN0357-9387

    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).
    @inproceedings{bd8f5b07ddf84dec94adf7496ed51879,
    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",
    year = "2010",
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    volume = "2",
    series = "VTT Symposium",
    publisher = "VTT Technical Research Centre of Finland",
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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).