Dynamic modeling of a multiple hearth furnace for kaolin calcination

Aleksi Eskelinen, Alexey Zakharov, Sirkka-Liisa Jämsä-Jounela, Jonathan Hearle

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A dynamic model of a multiple hearth kaolin calciner has been developed and is presented in this article. This model describes the physical-chemical phenomena taking place in the six furnace parts: the solid phase, gas phase, walls, cooling air, rabble arms, and the central shaft. The solid phase movement, in particular, is described by a novel mixing model. The mixing model divides the solid bed in a hearth into volumes and the distribution of their contents, after one full central shaft rotation, is identified by the pilot experiments. First, the model is validated by the industrial data, and then the dynamics of the multiple hearth furnace is studied by introducing step changes to the three manipulated variables: the feed rate, and the gas, and air flows supplied. The responses of the gas phase temperature and solid bed component profiles are analysed and the results are discussed. © 2015 American Institute of Chemical Engineers AIChE J, 61: 3683–3698, 2015
Original languageEnglish
Pages (from-to)3683–3698
Number of pages16
JournalAIChE Journal
Issue number11
Publication statusPublished - 2015
MoE publication typeA1 Journal article-refereed


  • Multiple hearth furnace
  • dynamic modeling
  • kaolin calcination
  • pilot experiments
  • industrial application
  • parameter estimation


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