Improved urea-water solution spray model for simulations of selective catalytic reduction systems

Rafał Rogóż, Łukasz Jan Kapusta, Jakub Bachanek, Joseph Vankan and Andrzej Teodorczyk

Renewable and Sustainable Energy Reviews, 2020, vol. 120, issue C

Abstract: Successive diesel engine emissions’ regulations impose increasingly tighter limits on the automotive industry. A well-established method to meet nitrogen oxides emissions’ requirements is selective catalytic reduction with a urea-water solution injection. State-of-the-art designs are based on close-coupled exhaust architecture which suffers from a lack of space for a proper decomposition of a urea-water solution. The optimization of such systems is very challenging and is always intensively supported by numerical simulations. Within this work a two-zone spray representation for a urea-water solution injection is proposed. The two-zone approach captures a non-uniform droplet distribution inside the spray cone while maintaining a reasonable calculation time, since it is still based on a Lagrangian method. The proposed model was applied into exhaust system simulations and tested against a standard spray representation. The results revealed that uniform spray representation led to a smaller wall film formation and different mass balance. Ammonia distribution at the catalyst inlet was not directly affected significantly; however, in real systems one could expect catalyst clogging due to wall film formation, followed by a decrease of ammonia distribution uniformity. The results clearly show that uniform spray representation may lead to misestimation of the selective catalytic reduction system’s performance and the novel two-zone approach should be used instead.

Keywords: SCR; CFD; Two-phase flow; Injection; Wall film; Urea-water solution (search for similar items in EconPapers)
Date: 2020
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Citations: View citations in EconPapers (2)

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DOI: 10.1016/j.rser.2019.109616

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