Modelling of catalytic oxidation of NH3 and reduction of NO on limestone during sulphur capture

Kiil, S, Bhatia, SK and DamJohansen, K (1996) Modelling of catalytic oxidation of NH3 and reduction of NO on limestone during sulphur capture. Chemical Engineering Science, 51 4: 587-601. doi:10.1016/0009-2509(95)00322-3


Author Kiil, S
Bhatia, SK
DamJohansen, K
Title Modelling of catalytic oxidation of NH3 and reduction of NO on limestone during sulphur capture
Journal name Chemical Engineering Science   Check publisher's open access policy
ISSN 0009-2509
Publication date 1996-02-01
Year available 1996
Sub-type Article (original research)
DOI 10.1016/0009-2509(95)00322-3
Open Access Status Not yet assessed
Volume 51
Issue 4
Start page 587
End page 601
Total pages 15
Place of publication OXFORD
Publisher PERGAMON-ELSEVIER SCIENCE LTD
Language eng
Abstract A theoretical study of the complex transient system of simultaneous sulphur capture and catalytic reactions of N-containing compounds taking place on a single limestone particle is conducted. The numerical technique developed previously by the authors (Kill et al., 1995, Chem. Engng Sci. 50, 2793-2799) based on collocation on moving finite elements is used to solve the model equations. To our knowledge, this is the first serious attempt to model such transient systems in detail. The particle is divided into moving zones, described by the reaction between limestone, O-2 and SO2, and each zone is assigned a certain catalytic activity with respect to each species involved. An existing particle model, the Grain-Micrograin Model, which simulates sulphur capture on calcined limestone under oxidizing conditions is considered in the modelling. Simulation results in good qualitative agreement with experimental data are obtained here for the catalytic chemistry of NH3 during simultaneous sulphur capture on a Stevns Chalk particle. The reduction of NO by NH3 over CaSO4 (which is the product of the reaction between SO2, O-2 and limestone) was found to be important because this reaction can, according to the model, explain to some extent the change in selectivity with increased solid conversion observed experimentally. Simulations also suggested that it may be advantageous with respect to the emission of NO to use small instead of big limestone particles for desulphurization in fluidized bed combustors due to the ways different sized particles capture SO2.
Keyword High-Temperature Reaction
Gas-Solid Reactions
Sulfur-Dioxide
Combustion Conditions
Pore Structure
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: WoS Import - Archived
 
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Created: Sun, 05 Nov 2017, 15:01:04 EST