Identification of key parameters of magnetite deposition on steam generator surfaces – modeling and preliminary experiments

Martin Bojinov (Corresponding Author), Essi Jäppinen, Timo Saario, Konsta Sipilä

    Research output: Contribution to journalArticleScientificpeer-review

    Abstract

    The present paper describes a sensitivity study of the fundamental parameters of a deposition model for magnetite on secondary circuit surfaces in terms of their relative influence on the individual steps of the overall process. First, a description of the processes of particle deposition and detachment is presented, emphasizing the role of Van der Waals and electrostatic forces, as well as the roughness of both particle and substrate. Particular attention is paid to the influence of water chemistry on these interaction forces. Further, the paper attempts to propose a mechanism for deposit consolidation modelled as a crystallization reaction and discusses the sensitivity of parameters of a Johnson-Mehl-Kolmogorov-Avrami approach to such a reaction. In the experimental part of the paper, preliminary results on the influence of temperature and water chemistry on the one of the key parameters – the zeta-potential of magnetite – are described and discussed. The results are successfully reproduced using a recent model from the literature on compatible media.
    Original languageEnglish
    Article number124239
    Number of pages9
    JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
    Volume586
    Early online date16 Nov 2019
    DOIs
    Publication statusPublished - 5 Feb 2020
    MoE publication typeA1 Journal article-refereed

    Fingerprint

    Ferrosoferric Oxide
    boilers
    Magnetite
    Steam generators
    magnetite
    Van der Waals forces
    Electrostatic force
    Water
    Zeta potential
    Crystallization
    Consolidation
    chemistry
    Deposits
    Surface roughness
    Experiments
    sensitivity
    consolidation
    detachment
    water
    Networks (circuits)

    Keywords

    • magnetite deposition
    • steam generator
    • particle consolidation
    • zeta potential

    Cite this

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    abstract = "The present paper describes a sensitivity study of the fundamental parameters of a deposition model for magnetite on secondary circuit surfaces in terms of their relative influence on the individual steps of the overall process. First, a description of the processes of particle deposition and detachment is presented, emphasizing the role of Van der Waals and electrostatic forces, as well as the roughness of both particle and substrate. Particular attention is paid to the influence of water chemistry on these interaction forces. Further, the paper attempts to propose a mechanism for deposit consolidation modelled as a crystallization reaction and discusses the sensitivity of parameters of a Johnson-Mehl-Kolmogorov-Avrami approach to such a reaction. In the experimental part of the paper, preliminary results on the influence of temperature and water chemistry on the one of the key parameters – the zeta-potential of magnetite – are described and discussed. The results are successfully reproduced using a recent model from the literature on compatible media.",
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    Identification of key parameters of magnetite deposition on steam generator surfaces – modeling and preliminary experiments. / Bojinov, Martin (Corresponding Author); Jäppinen, Essi; Saario, Timo; Sipilä, Konsta.

    In: Colloids and Surfaces A: Physicochemical and Engineering Aspects, Vol. 586, 124239, 05.02.2020.

    Research output: Contribution to journalArticleScientificpeer-review

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    AU - Bojinov, Martin

    AU - Jäppinen, Essi

    AU - Saario, Timo

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    AB - The present paper describes a sensitivity study of the fundamental parameters of a deposition model for magnetite on secondary circuit surfaces in terms of their relative influence on the individual steps of the overall process. First, a description of the processes of particle deposition and detachment is presented, emphasizing the role of Van der Waals and electrostatic forces, as well as the roughness of both particle and substrate. Particular attention is paid to the influence of water chemistry on these interaction forces. Further, the paper attempts to propose a mechanism for deposit consolidation modelled as a crystallization reaction and discusses the sensitivity of parameters of a Johnson-Mehl-Kolmogorov-Avrami approach to such a reaction. In the experimental part of the paper, preliminary results on the influence of temperature and water chemistry on the one of the key parameters – the zeta-potential of magnetite – are described and discussed. The results are successfully reproduced using a recent model from the literature on compatible media.

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