IDEAS home Printed from https://ideas.repec.org/a/eee/energy/v226y2021ics0360544221006885.html
   My bibliography  Save this article

Temperature gradient induced changes within superheater ash deposits high in chlorine

Author

Listed:
  • Balint, Roland
  • Engblom, Markus
  • Niemi, Jonne
  • Silva da Costa, Daniel
  • Lindberg, Daniel
  • Yrjas, Patrik
  • Hupa, Leena
  • Hupa, Mikko

Abstract

Cross-sections of kraft recovery boiler superheater deposits were analyzed using scanning electron microscopy (SEM) and energy dispersive X-ray analysis (EDX). The observed deposit morphology can be explained by temperature gradient induced time-dependent processes such as diffusional transport of alkali chloride vapours, temperature gradient zone melting, formation of melt enriched in Cl and K, and movement of this enriched melt towards the steel. These processes have recently been identified on a laboratory scale under well-controlled conditions, and are now for the first time identified to take place also in actual boiler superheater deposits. The identified processes alter the local deposit composition and melting behaviour close to the steel. The local first melting temperature (T0) close to the steel is lower by 30 °C compared to that of the deposit bulk T0. The observations made in this work give new insight into the melting and ageing behaviour of superheater deposits, relevant for superheater corrosion.

Suggested Citation

  • Balint, Roland & Engblom, Markus & Niemi, Jonne & Silva da Costa, Daniel & Lindberg, Daniel & Yrjas, Patrik & Hupa, Leena & Hupa, Mikko, 2021. "Temperature gradient induced changes within superheater ash deposits high in chlorine," Energy, Elsevier, vol. 226(C).
    • Handle: RePEc:eee:energy:v:226:y:2021:i:c:s0360544221006885
    DOI: 10.1016/j.energy.2021.120439
    as

    Download full text from publisher

    File URL: http://www.sciencedirect.com/science/article/pii/S0360544221006885
    Download Restriction: Full text for ScienceDirect subscribers only
    File URL: https://libkey.io/10.1016/j.energy.2021.120439?utm_source=ideas
    LibKey link: if access is restricted and if your library uses this service, LibKey will redirect you to where you can use your library subscription to access this item
    ---><---

    As the access to this document is restricted, you may want to search for a different version of it.

    Citations

    Citations are extracted by the CitEc Project, subscribe to its RSS feed for this item.
    as


    Cited by:

    1. Niemi, Jonne & Engblom, Markus & Laurén, Tor & Yrjas, Patrik & Lehmusto, Juho & Hupa, Mikko & Lindberg, Daniel, 2021. "Superheater deposits and corrosion in temperature gradient – Laboratory studies into effects of flue gas composition, initial deposit structure, and exposure time," Energy, Elsevier, vol. 228(C).
    2. Katarzyna Węglarz & Dawid Taler & Jan Taler & Mateusz Marcinkowski, 2023. "Numerical Modelling of Steam Superheaters in Supercritical Boilers," Energies, MDPI, vol. 16(6), pages 1-19, March.
    3. Balint, Roland & Engblom, Markus & Niemi, Jonne & Lindberg, Daniel & Saarinen, Timo & Rautala, Jaakko & Hupa, Mikko & Hupa, Leena, 2023. "Morphological and chemical differences within superheater deposits from different locations of a black liquor recovery boiler," Energy, Elsevier, vol. 267(C).
    4. Monedero, Esperanza & Pazo, Amparo & Collado, Rocío & Dura, Oscar J. & Hernández, Juan José, 2024. "Analysis of fouling in domestic boilers fueled with non-woody biomass," Renewable Energy, Elsevier, vol. 226(C).
    5. Węglarz, Katarzyna & Taler, Dawid & Taler, Jan, 2022. "New non-iterative method for computation of tubular cross-flow heat exchangers," Energy, Elsevier, vol. 260(C).

    Corrections

    All material on this site has been provided by the respective publishers and authors. You can help correct errors and omissions. When requesting a correction, please mention this item's handle: RePEc:eee:energy:v:226:y:2021:i:c:s0360544221006885. See general information about how to correct material in RePEc.

    If you have authored this item and are not yet registered with RePEc, we encourage you to do it here. This allows to link your profile to this item. It also allows you to accept potential citations to this item that we are uncertain about.

    We have no bibliographic references for this item. You can help adding them by using this form .

    If you know of missing items citing this one, you can help us creating those links by adding the relevant references in the same way as above, for each refering item. If you are a registered author of this item, you may also want to check the "citations" tab in your RePEc Author Service profile, as there may be some citations waiting for confirmation.

    For technical questions regarding this item, or to correct its authors, title, abstract, bibliographic or download information, contact: Catherine Liu (email available below). General contact details of provider: http://www.journals.elsevier.com/energy .

    Please note that corrections may take a couple of weeks to filter through the various RePEc services.

    IDEAS is a RePEc service. RePEc uses bibliographic data supplied by the respective publishers.