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Kinetic evaluation of lime for medium-temperature desulfurization in oxy-fuel conditions by dry sorbent injection

Sanku, Meher G. LU ; Karlsson, Hanna K. LU ; Hulteberg, Christian LU ; Wang, Wuyin LU ; Stallmann, Olaf and Karlsson, Hans T. LU (2019) In Energies 12(14).
Abstract

With increasing emphasis on the control of greenhouse gases, power plants may move towards oxy-fuel technologies rather than air-fired plants. This move leads to a change in the feed to the desulfurization unit, which also needs to be adapted along with the power plant. Most existing plants already have functioning desulfurization units, which need to be retrofitted for the new conditions. In the present study, three different limes have been examined as sorbents for sulfur capture in oxy-fuel conditions with varying residence times at medium temperature (150–450 C). Parameters indicative of the kinetics and competition between SO2 and CO2, like SO2 breakthrough time, total lime conversion,... (More)

With increasing emphasis on the control of greenhouse gases, power plants may move towards oxy-fuel technologies rather than air-fired plants. This move leads to a change in the feed to the desulfurization unit, which also needs to be adapted along with the power plant. Most existing plants already have functioning desulfurization units, which need to be retrofitted for the new conditions. In the present study, three different limes have been examined as sorbents for sulfur capture in oxy-fuel conditions with varying residence times at medium temperature (150–450 C). Parameters indicative of the kinetics and competition between SO2 and CO2, like SO2 breakthrough time, total lime conversion, yield for sulfur capture and sulfur selectivity have been evaluated. The results of this study lead to the recommendation that medium temperature desulfurization should be used for moderate SO2 capture, in combination with already existing sulfur capture systems. The effects of CO2 and water vapor have also been analyzed. In addition, the performance of the unit irrespective of temperature strongly depends on the lime type. In addition, absence of water vapor strongly favored the desulfurization process when there was high concentration of CO2.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Desulfurization, Dry sorbent injection, Lime, Medium temperature, Oxyfuel
in
Energies
volume
12
issue
14
article number
2645
publisher
MDPI AG
external identifiers
  • scopus:85068856105
ISSN
1996-1073
DOI
10.3390/en12142645
language
English
LU publication?
yes
id
d1030993-dd98-41ff-bedf-653672999aae
date added to LUP
2019-07-24 15:24:04
date last changed
2020-01-13 02:15:22
@article{d1030993-dd98-41ff-bedf-653672999aae,
  abstract     = {<p>With increasing emphasis on the control of greenhouse gases, power plants may move towards oxy-fuel technologies rather than air-fired plants. This move leads to a change in the feed to the desulfurization unit, which also needs to be adapted along with the power plant. Most existing plants already have functioning desulfurization units, which need to be retrofitted for the new conditions. In the present study, three different limes have been examined as sorbents for sulfur capture in oxy-fuel conditions with varying residence times at medium temperature (150–450 <sup>◦</sup>C). Parameters indicative of the kinetics and competition between SO<sub>2</sub> and CO<sub>2</sub>, like SO<sub>2</sub> breakthrough time, total lime conversion, yield for sulfur capture and sulfur selectivity have been evaluated. The results of this study lead to the recommendation that medium temperature desulfurization should be used for moderate SO<sub>2</sub> capture, in combination with already existing sulfur capture systems. The effects of CO<sub>2</sub> and water vapor have also been analyzed. In addition, the performance of the unit irrespective of temperature strongly depends on the lime type. In addition, absence of water vapor strongly favored the desulfurization process when there was high concentration of CO<sub>2</sub>.</p>},
  author       = {Sanku, Meher G. and Karlsson, Hanna K. and Hulteberg, Christian and Wang, Wuyin and Stallmann, Olaf and Karlsson, Hans T.},
  issn         = {1996-1073},
  language     = {eng},
  month        = {07},
  number       = {14},
  publisher    = {MDPI AG},
  series       = {Energies},
  title        = {Kinetic evaluation of lime for medium-temperature desulfurization in oxy-fuel conditions by dry sorbent injection},
  url          = {http://dx.doi.org/10.3390/en12142645},
  doi          = {10.3390/en12142645},
  volume       = {12},
  year         = {2019},
}