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

Research output: Contribution to journalArticle

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, 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.

Details

Authors
Organisations
External organisations
  • GE Power Sweden AB
  • Baker Hughes
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Chemical Process Engineering

Keywords

  • Desulfurization, Dry sorbent injection, Lime, Medium temperature, Oxyfuel
Original languageEnglish
Article number2645
JournalEnergies
Volume12
Issue number14
Publication statusPublished - 2019 Jul 10
Publication categoryResearch
Peer-reviewedYes