Kinetic Evaluation of Lime for Medium-Temperature Desulfurization in Oxy-Fuel Conditions by Dry Sorbent Injection

Meher G. Sanku, Hanna K. Karlsson, Christian Hulteberg, Wuyin Wang, Olaf Stallmann and Hans T. Karlsson
Additional contact information
Meher G. Sanku: Department of Chemical Engineering, Lund University, Box 124, SE-221 00 Lund, Sweden
Hanna K. Karlsson: Department of Chemical Engineering, Lund University, Box 124, SE-221 00 Lund, Sweden
Christian Hulteberg: Department of Chemical Engineering, Lund University, Box 124, SE-221 00 Lund, Sweden
Wuyin Wang: GE Power Sweden AB, SE-352 41 Växjö, Sweden
Olaf Stallmann: Baker Hughes, a GE Company (Nuovopignone Tecnologie International S.r.L.), D-60313 Frankfurt, Germany
Hans T. Karlsson: Department of Chemical Engineering, Lund University, Box 124, SE-221 00 Lund, Sweden

Energies, 2019, vol. 12, issue 14, 1-16

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 SO 2 and CO 2 , like SO 2 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 2 capture, in combination with already existing sulfur capture systems. The effects of CO 2 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 2 .

Keywords: oxyfuel; dry sorbent injection; medium temperature; desulfurization; lime (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
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