The importance of individual spray properties in performance improvement of a urea-SCR system employing flash-boiling injection

Bartosz Kaźmierski and Łukasz Jan Kapusta

Applied Energy, 2023, vol. 329, issue C, No S030626192201474X

Abstract: The appropriate mixing of a urea–water solution (UWS) with exhaust gases in a selective catalytic reduction system is crucial to efficiently reduce nitrogen oxides and diminish the deposition of liquid wall film. One of the methods to enhance the mixing of the UWS with the exhaust gases is a flash-boiling injection. Its positive effect has been linked with a reduced Sauter mean diameter (SMD) and improved evaporation, but the flash boiling influences all the spray parameters. For low-injection-pressure cases, the spray angle generally increases, and spray-tip penetration reduces. Moreover, the reduction of the droplet size is not manifested only by reduced average droplet diameter such as SMD, but also the shape of the droplet-size distribution is changed when the injected liquid is superheated. It has not been evaluated which of these factors is the most important. It is also unknown whether the synergy between these factors is an essential element. In this study, we aim to fill these gaps and provide the numerical analysis of the influence of individual parameters of urea–water solution sprays on the exhaust system’s performance, with particular reference to the changes caused by flash boiling.

Keywords: NOx reduction; Selective catalytic reduction; Flash boiling; Numerical spray modelling; Superheating; Urea–water solution (search for similar items in EconPapers)
Date: 2023
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Citations: View citations in EconPapers (2)

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DOI: 10.1016/j.apenergy.2022.120217

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