Dynamic reactivity and comminution behaviour of particles in CFBC

Jaakko Saastamoinen, Antti Tourunen, Heidi Häsä, Juha Pitsinki, Jouni Hämäläinen, Timo Hyppänen, Miro Loschkin, Toni Pikkarainen

Research output: Contribution to journalArticleScientificpeer-review

Abstract

Steady state population balance modelling has widely been used to simulate the particle size distribution (PSD) of different material (fuel, ash, sand or limestone particles) in fluidized bed combustion (FBC) and circulating fluidized bed combustion (CFBC). The steady state approach cannot be used to study the effect of rapid changes in dynamic conditions, where the fuel with different reactivity and PSD and the PSD of its ash vary, but a dynamic model is more appropriate.

Bench scale reactors can be applied to study basic comminution and reaction rate behaviour of materials with a fuel batch input, which is more easily operated than a reactor with a continuous feed. Then however, the dynamic population balance approach is required to interpret the results, extract model parameters from measurements and convert them applicable for steady state models or models that divide the PSD into a few fractions.

The stability of combustion in FBC and CFBC depends much on the char inventory in the bed, which is affected by the size and reactivity of the fuel and the operational conditions (temperature, oxygen level). Dynamic population model can be applied to study the change of the char inventory due to changes in fuel or in operational conditions. These changes are quite rapid compared to the slow changes in the PSD of ash in the bed after fuel is changed to another. The steady state and the time required to approach steady can also be simulated with the dynamic model by continuing the calculation long time.

A dynamic population balance model is applied to study reactivity and comminution behaviour of particles. Tests are carried out in a pilot scale CFB and bench scale fluidized bed reactors.
Original languageEnglish
Pages (from-to)41-71
Number of pages30
JournalFar East Journal of Applied Mathematics
Volume23
Issue number1
Publication statusPublished - 2006
MoE publication typeA1 Journal article-refereed

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Fluidized bed combustion
Comminution
Ashes
Particle size analysis
Population dynamics
Dynamic models
Limestone
Fluidized beds
Reaction rates
Sand
Oxygen

Cite this

Saastamoinen, J., Tourunen, A., Häsä, H., Pitsinki, J., Hämäläinen, J., Hyppänen, T., ... Pikkarainen, T. (2006). Dynamic reactivity and comminution behaviour of particles in CFBC. Far East Journal of Applied Mathematics, 23(1), 41-71.
Saastamoinen, Jaakko ; Tourunen, Antti ; Häsä, Heidi ; Pitsinki, Juha ; Hämäläinen, Jouni ; Hyppänen, Timo ; Loschkin, Miro ; Pikkarainen, Toni. / Dynamic reactivity and comminution behaviour of particles in CFBC. In: Far East Journal of Applied Mathematics. 2006 ; Vol. 23, No. 1. pp. 41-71.
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Saastamoinen, J, Tourunen, A, Häsä, H, Pitsinki, J, Hämäläinen, J, Hyppänen, T, Loschkin, M & Pikkarainen, T 2006, 'Dynamic reactivity and comminution behaviour of particles in CFBC', Far East Journal of Applied Mathematics, vol. 23, no. 1, pp. 41-71.

Dynamic reactivity and comminution behaviour of particles in CFBC. / Saastamoinen, Jaakko; Tourunen, Antti; Häsä, Heidi; Pitsinki, Juha; Hämäläinen, Jouni; Hyppänen, Timo; Loschkin, Miro; Pikkarainen, Toni.

In: Far East Journal of Applied Mathematics, Vol. 23, No. 1, 2006, p. 41-71.

Research output: Contribution to journalArticleScientificpeer-review

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T1 - Dynamic reactivity and comminution behaviour of particles in CFBC

AU - Saastamoinen, Jaakko

AU - Tourunen, Antti

AU - Häsä, Heidi

AU - Pitsinki, Juha

AU - Hämäläinen, Jouni

AU - Hyppänen, Timo

AU - Loschkin, Miro

AU - Pikkarainen, Toni

N1 - Project code: C4SU00036

PY - 2006

Y1 - 2006

N2 - Steady state population balance modelling has widely been used to simulate the particle size distribution (PSD) of different material (fuel, ash, sand or limestone particles) in fluidized bed combustion (FBC) and circulating fluidized bed combustion (CFBC). The steady state approach cannot be used to study the effect of rapid changes in dynamic conditions, where the fuel with different reactivity and PSD and the PSD of its ash vary, but a dynamic model is more appropriate.Bench scale reactors can be applied to study basic comminution and reaction rate behaviour of materials with a fuel batch input, which is more easily operated than a reactor with a continuous feed. Then however, the dynamic population balance approach is required to interpret the results, extract model parameters from measurements and convert them applicable for steady state models or models that divide the PSD into a few fractions.The stability of combustion in FBC and CFBC depends much on the char inventory in the bed, which is affected by the size and reactivity of the fuel and the operational conditions (temperature, oxygen level). Dynamic population model can be applied to study the change of the char inventory due to changes in fuel or in operational conditions. These changes are quite rapid compared to the slow changes in the PSD of ash in the bed after fuel is changed to another. The steady state and the time required to approach steady can also be simulated with the dynamic model by continuing the calculation long time.A dynamic population balance model is applied to study reactivity and comminution behaviour of particles. Tests are carried out in a pilot scale CFB and bench scale fluidized bed reactors.

AB - Steady state population balance modelling has widely been used to simulate the particle size distribution (PSD) of different material (fuel, ash, sand or limestone particles) in fluidized bed combustion (FBC) and circulating fluidized bed combustion (CFBC). The steady state approach cannot be used to study the effect of rapid changes in dynamic conditions, where the fuel with different reactivity and PSD and the PSD of its ash vary, but a dynamic model is more appropriate.Bench scale reactors can be applied to study basic comminution and reaction rate behaviour of materials with a fuel batch input, which is more easily operated than a reactor with a continuous feed. Then however, the dynamic population balance approach is required to interpret the results, extract model parameters from measurements and convert them applicable for steady state models or models that divide the PSD into a few fractions.The stability of combustion in FBC and CFBC depends much on the char inventory in the bed, which is affected by the size and reactivity of the fuel and the operational conditions (temperature, oxygen level). Dynamic population model can be applied to study the change of the char inventory due to changes in fuel or in operational conditions. These changes are quite rapid compared to the slow changes in the PSD of ash in the bed after fuel is changed to another. The steady state and the time required to approach steady can also be simulated with the dynamic model by continuing the calculation long time.A dynamic population balance model is applied to study reactivity and comminution behaviour of particles. Tests are carried out in a pilot scale CFB and bench scale fluidized bed reactors.

M3 - Article

VL - 23

SP - 41

EP - 71

JO - Far East Journal of Applied Mathematics

JF - Far East Journal of Applied Mathematics

SN - 0972-0960

IS - 1

ER -

Saastamoinen J, Tourunen A, Häsä H, Pitsinki J, Hämäläinen J, Hyppänen T et al. Dynamic reactivity and comminution behaviour of particles in CFBC. Far East Journal of Applied Mathematics. 2006;23(1):41-71.