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Morphological and chemical differences within superheater deposits from different locations of a black liquor recovery boiler

Author

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  • Balint, Roland
  • Engblom, Markus
  • Niemi, Jonne
  • Lindberg, Daniel
  • Saarinen, Timo
  • Rautala, Jaakko
  • Hupa, Mikko
  • Hupa, Leena

Abstract

The effects of two deposit ageing mechanisms were identified by analysing superheater ash deposits from a kraft recovery boiler. Local differences in deposit morphology and chemical composition were identified under the electron microscope. Temperature-gradient-induced diffusion of alkali chloride vapours toward the steel was evident. Two deposit types were identified, based on local chemical compositions: “Type 1” deposits had an innermost porous layer of fine, sintered fume particles enriched in K and Cl, that deposited after homogeneous condensation in the gas phase. “Type 2” deposits formed via sulfation of initially deposited fume particles rich in K and Cl. Thus the innermost layer was enriched in K and S, while concurrently depleted in Cl. Differences in the local first melting temperature (T0) within the innermost regions of the two deposit types were identified. T0 reached a minimum within the innermost region of Type 1 deposits, implying an increased risk for melt formation and corrosion. Whereas for Type 2 deposits, T0 was increased closest to the steel, reducing the risk for melt formation and superheater corrosion. The presented results provide a better understanding of intra-depositional changes taking place after initial deposition, helping assess risks of deposit-related operational problems in the boiler.

Suggested Citation

  • 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).
    • Handle: RePEc:eee:energy:v:267:y:2023:i:c:s0360544222034636
    DOI: 10.1016/j.energy.2022.126576
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    References listed on IDEAS

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    1. Hengli Zhang & Chunjiang Yu & Zhongyang Luo & Yu’an Li, 2020. "Investigation of Ash Deposition Dynamic Process in an Industrial Biomass CFB Boiler Burning High-Alkali and Low-Chlorine Fuel," Energies, MDPI, vol. 13(5), pages 1-11, March.
    2. 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).
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