Bench-scale and modelling study of the effect of H2O on sulphur capture by limestone in conditions of fluidized-bed air combustion and oxycombustion

Sirpa Rahiala, Jouni Ritvanen, Timo Hyppänen, Toni Pikkarainen

Research output: Contribution to journalArticleScientificpeer-review

2 Citations (Scopus)

Abstract

Limestone is used widely in fluidized bed energy applications for sulphur capture. The conditions of the novel fluidized bed energy processes can differ from the conditions (i.e., temperature and gas concentrations) in conventional fluidized bed applications for energy production. The influence of H2O(g) on calcination and indirect sulphation was examined with one limestone type in a bench-scale reactor. A time-dependent multilayer particle model was used for analysing the experimental results. The studied atmosphere included 0%, 10% or 20% H2O(g) and two different CO2concentration levels (15% and 50%). The temperature level was the same in all tests (~1188 K). The added H2O(g) increased the conversion degree compared to conditions without H2O(g) in all test conditions. The model was used to explicate the observed differences between test results with and without H2O(g) and determine the conversion curve, conversion profile and magnitude of reactions and diffusion as a function of radius and time. The results show that different sulphation patterns and conversion degrees can be explained with different limitations inside the particles in terms of time and in different conditions.
Original languageEnglish
Pages (from-to)233-240
Number of pages8
JournalFuel
Volume196
DOIs
Publication statusPublished - 2017
MoE publication typeA1 Journal article-refereed

Fingerprint

Calcium Carbonate
Limestone
Sulfur
Fluidized beds
Air
Calcination
Multilayers
Gases
Temperature

Keywords

  • fluidized bed
  • limestone
  • modelling
  • oxycombustion
  • sulphur capture
  • water vapour

Cite this

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title = "Bench-scale and modelling study of the effect of H2O on sulphur capture by limestone in conditions of fluidized-bed air combustion and oxycombustion",
abstract = "Limestone is used widely in fluidized bed energy applications for sulphur capture. The conditions of the novel fluidized bed energy processes can differ from the conditions (i.e., temperature and gas concentrations) in conventional fluidized bed applications for energy production. The influence of H2O(g) on calcination and indirect sulphation was examined with one limestone type in a bench-scale reactor. A time-dependent multilayer particle model was used for analysing the experimental results. The studied atmosphere included 0{\%}, 10{\%} or 20{\%} H2O(g) and two different CO2concentration levels (15{\%} and 50{\%}). The temperature level was the same in all tests (~1188 K). The added H2O(g) increased the conversion degree compared to conditions without H2O(g) in all test conditions. The model was used to explicate the observed differences between test results with and without H2O(g) and determine the conversion curve, conversion profile and magnitude of reactions and diffusion as a function of radius and time. The results show that different sulphation patterns and conversion degrees can be explained with different limitations inside the particles in terms of time and in different conditions.",
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author = "Sirpa Rahiala and Jouni Ritvanen and Timo Hypp{\"a}nen and Toni Pikkarainen",
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language = "English",
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Bench-scale and modelling study of the effect of H2O on sulphur capture by limestone in conditions of fluidized-bed air combustion and oxycombustion. / Rahiala, Sirpa; Ritvanen, Jouni; Hyppänen, Timo; Pikkarainen, Toni.

In: Fuel, Vol. 196, 2017, p. 233-240.

Research output: Contribution to journalArticleScientificpeer-review

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AU - Rahiala, Sirpa

AU - Ritvanen, Jouni

AU - Hyppänen, Timo

AU - Pikkarainen, Toni

PY - 2017

Y1 - 2017

N2 - Limestone is used widely in fluidized bed energy applications for sulphur capture. The conditions of the novel fluidized bed energy processes can differ from the conditions (i.e., temperature and gas concentrations) in conventional fluidized bed applications for energy production. The influence of H2O(g) on calcination and indirect sulphation was examined with one limestone type in a bench-scale reactor. A time-dependent multilayer particle model was used for analysing the experimental results. The studied atmosphere included 0%, 10% or 20% H2O(g) and two different CO2concentration levels (15% and 50%). The temperature level was the same in all tests (~1188 K). The added H2O(g) increased the conversion degree compared to conditions without H2O(g) in all test conditions. The model was used to explicate the observed differences between test results with and without H2O(g) and determine the conversion curve, conversion profile and magnitude of reactions and diffusion as a function of radius and time. The results show that different sulphation patterns and conversion degrees can be explained with different limitations inside the particles in terms of time and in different conditions.

AB - Limestone is used widely in fluidized bed energy applications for sulphur capture. The conditions of the novel fluidized bed energy processes can differ from the conditions (i.e., temperature and gas concentrations) in conventional fluidized bed applications for energy production. The influence of H2O(g) on calcination and indirect sulphation was examined with one limestone type in a bench-scale reactor. A time-dependent multilayer particle model was used for analysing the experimental results. The studied atmosphere included 0%, 10% or 20% H2O(g) and two different CO2concentration levels (15% and 50%). The temperature level was the same in all tests (~1188 K). The added H2O(g) increased the conversion degree compared to conditions without H2O(g) in all test conditions. The model was used to explicate the observed differences between test results with and without H2O(g) and determine the conversion curve, conversion profile and magnitude of reactions and diffusion as a function of radius and time. The results show that different sulphation patterns and conversion degrees can be explained with different limitations inside the particles in terms of time and in different conditions.

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