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 journalArticle

7 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

    Fingerprint

Keywords

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

Cite this

Wy, H., Jspersen, J. B., Frandsen, F. J., Glarborg, P., Aho, M., Paakkinen, K., & Taipale, R. (2013). Modeling of ferric sulfate decomposition and sulfation of potassium chloride during grate-firing of biomass. AIChE Journal, 59(11), 4314-4324. https://doi.org/10.1002/aic.14174