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

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dc.contributorAalto-yliopistofi
dc.contributorAalto Universityen
dc.contributor.authorBalint, Roland
dc.contributor.authorEngblom, Markus
dc.contributor.authorNiemi, Jonne
dc.contributor.authorLindberg, Daniel
dc.contributor.authorSaarinen, Timo
dc.contributor.authorRautala, Jaakko
dc.contributor.authorHupa, Mikko
dc.contributor.authorHupa, Leena
dc.contributor.departmentÅbo Akademi University
dc.contributor.departmentDepartment of Chemical and Metallurgical Engineering
dc.contributor.departmentMetsä Fibre Oy
dc.contributor.departmentDepartment of Chemical and Metallurgical Engineeringen
dc.date.accessioned2023-01-25T07:35:39Z
dc.date.available2023-01-25T07:35:39Z
dc.date.issued2023-03-15
dc.descriptionFunding Information: The financing through a research grant awarded by the Fortum Foundation [Application number 20190123] is highly acknowledged. This work has been partly carried out within the Åbo Akademi CLUE2 Research Consortium (2017–2022). Support from ANDRITZ Oy, Valmet Technologies Oy, UPM-Kymmene Oyj, Metsä Fibre Oy, and International Paper Inc. is gratefully acknowledged. Additional support from the Academy of Finland projects “Understanding the dynamics of intradeposit chemistry and morphology for control of corrosion in high temperature processes“ [Decision number 310266] and “New insights on the effects of temperature gradients on high temperature corrosion” [Decision number 338322] is highly appreciated. We want to thank Linus Silvander for carrying out SEM/EDX analyses. Publisher Copyright: © 2023 The Authors
dc.description.abstractThe 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.en
dc.description.versionPeer revieweden
dc.format.extent11
dc.format.mimetypeapplication/pdf
dc.identifier.citationBalint , R , Engblom , M , Niemi , J , Lindberg , D , Saarinen , T , Rautala , J , Hupa , M & Hupa , L 2023 , ' Morphological and chemical differences within superheater deposits from different locations of a black liquor recovery boiler ' , Energy , vol. 267 , 126576 . https://doi.org/10.1016/j.energy.2022.126576en
dc.identifier.doi10.1016/j.energy.2022.126576
dc.identifier.issn0360-5442
dc.identifier.issn1873-6785
dc.identifier.otherPURE UUID: e6054d40-8be3-446b-8d9b-77488cdea6d0
dc.identifier.otherPURE ITEMURL: https://research.aalto.fi/en/publications/e6054d40-8be3-446b-8d9b-77488cdea6d0
dc.identifier.otherPURE LINK: http://www.scopus.com/inward/record.url?scp=85145684032&partnerID=8YFLogxK
dc.identifier.otherPURE FILEURL: https://research.aalto.fi/files/98285929/CHEM_Balint_et_al_Morphological_and_chemical_2023_Energy.pdf
dc.identifier.urihttps://aaltodoc.aalto.fi/handle/123456789/119176
dc.identifier.urnURN:NBN:fi:aalto-202301251530
dc.language.isoenen
dc.publisherElsevier Ltd
dc.relation.ispartofseriesEnergyen
dc.relation.ispartofseriesVolume 267en
dc.rightsopenAccessen
dc.subject.keywordAgeing mechanism
dc.subject.keywordLocal melting behaviour
dc.subject.keywordSuperheater deposits
dc.subject.keywordTemperature gradient
dc.titleMorphological and chemical differences within superheater deposits from different locations of a black liquor recovery boileren
dc.typeA1 Alkuperäisartikkeli tieteellisessä aikakauslehdessäfi
dc.type.versionpublishedVersion
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