Model of fragmentation of limestone particles during thermal shock and calcination in fluidised beds

Jaakko Saastamoinen (Corresponding Author), Toni Pikkarainen, Antti Tourunen, Marko Räsänen, Timo Jäntti

Research output: Contribution to journalArticleScientificpeer-review

23 Citations (Scopus)

Abstract

Fragmentation of limestone due to thermal shock and calcination in a fluidised bed was studied through experiments and modelling. The time for heating was estimated by model calculations and the time for calcination by measurements. Fragmentation due to thermal shock was carried out by experiments in a CO2 atmosphere in order to prevent the effect of calcination. It was found to be much less than fragmentation due to calcination. Average particle sizes before and after fragmentation are presented for several types of limestone. The effects of particle size and gas composition on the primary fragmentation were studied through experiments. Increasing the fluidisation velocity increased the tendency to fragment. The evolution of the particle size distribution (PSD) of limestone particles due to thermal shock and during calcination (or simultaneous calcination and sulphation) were calculated using a population balance model. Fragmentation due to thermal shock is treated as an instantaneous process. The fragmentation frequency during calcination is presented as exponentially decaying over time. In addition to the final PSD, this model also predicts the PSD during the calcination process. The fragmentation was practically found to end after 10 min. Furthermore, a population balance method to calculate the particle size distribution and amount of limestone in fluidised beds in dynamic and steady state, when feeding history is known, is presented.
Original languageEnglish
Pages (from-to)244 - 251
Number of pages8
JournalPowder Technology
Volume187
Issue number3
DOIs
Publication statusPublished - 2008
MoE publication typeA1 Journal article-refereed

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Calcium Carbonate
Thermal shock
Limestone
Calcination
Particle size analysis
Particle size
Experiments
Fluidization
Particles (particulate matter)
Gases
Heating
Chemical analysis

Keywords

  • fragmentation
  • limestone particles
  • thermal shock
  • calcination
  • modelling

Cite this

Saastamoinen, Jaakko ; Pikkarainen, Toni ; Tourunen, Antti ; Räsänen, Marko ; Jäntti, Timo. / Model of fragmentation of limestone particles during thermal shock and calcination in fluidised beds. In: Powder Technology. 2008 ; Vol. 187, No. 3. pp. 244 - 251.
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Model of fragmentation of limestone particles during thermal shock and calcination in fluidised beds. / Saastamoinen, Jaakko (Corresponding Author); Pikkarainen, Toni; Tourunen, Antti; Räsänen, Marko; Jäntti, Timo.

In: Powder Technology, Vol. 187, No. 3, 2008, p. 244 - 251.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Model of fragmentation of limestone particles during thermal shock and calcination in fluidised beds

AU - Saastamoinen, Jaakko

AU - Pikkarainen, Toni

AU - Tourunen, Antti

AU - Räsänen, Marko

AU - Jäntti, Timo

PY - 2008

Y1 - 2008

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AB - Fragmentation of limestone due to thermal shock and calcination in a fluidised bed was studied through experiments and modelling. The time for heating was estimated by model calculations and the time for calcination by measurements. Fragmentation due to thermal shock was carried out by experiments in a CO2 atmosphere in order to prevent the effect of calcination. It was found to be much less than fragmentation due to calcination. Average particle sizes before and after fragmentation are presented for several types of limestone. The effects of particle size and gas composition on the primary fragmentation were studied through experiments. Increasing the fluidisation velocity increased the tendency to fragment. The evolution of the particle size distribution (PSD) of limestone particles due to thermal shock and during calcination (or simultaneous calcination and sulphation) were calculated using a population balance model. Fragmentation due to thermal shock is treated as an instantaneous process. The fragmentation frequency during calcination is presented as exponentially decaying over time. In addition to the final PSD, this model also predicts the PSD during the calcination process. The fragmentation was practically found to end after 10 min. Furthermore, a population balance method to calculate the particle size distribution and amount of limestone in fluidised beds in dynamic and steady state, when feeding history is known, is presented.

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KW - thermal shock

KW - calcination

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