Modeling of ferric sulfate decomposition and sulfation of potassium chloride during grate-firing of biomass

H. Wy (Corresponding Author), J.B. Jspersen, F.J. Frandsen, P. Glarborg, Martti Aho, Kari Paakkinen, Raili Taipale

    Research output: Contribution to journalArticleScientificpeer-review

    8 Citations (Scopus)

    Abstract

    Ferric sulfate is used as an additive in biomass combustion to convert the released potassium chloride to the less harmful potassium sulfate. The decomposition of ferric sulfate is studied in a fast heating rate thermogravimetric analyzer and a volumetric reaction model is proposed to describe the process. The yields of sulfur oxides from ferric sulfate decomposition under boiler conditions are investigated experimentally, revealing a distribution of approximately 40% SO3 and 60% SO2. The ferric sulfate decomposition model is combined with a detailed kinetic model of gas‐phase KCl sulfation and a model of K2SO4 condensation to simulate the sulfation of KCl by ferric sulfate addition. The simulation results show good agreements with experiments conducted in a biomass grate‐firing reactor. The results indicate that the SO3 released from ferric sulfate decomposition is the main contributor to KCl sulfation and that the effectiveness of ferric sulfate addition is sensitive to the applied temperature conditions.
    Original languageEnglish
    Pages (from-to)4314-4324
    Number of pages10
    JournalAIChE Journal
    Volume59
    Issue number11
    DOIs
    Publication statusPublished - 2013
    MoE publication typeA1 Journal article-refereed

    Keywords

    • additive
    • biomass combustion
    • chemical kinetics modeling
    • sulfate decomposition
    • sulfation of potassium chloride

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