VII Kongres PTNSS - 27-29 Czerwiec 2017
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The influence of the injection frequency on the urea selective catalytic reduction systems performance

Increasingly stringent car emission requirements, especially for nitrogen oxides, force automotive industry to after-treatment technologies application. The most promising method to fulfill high reduction standards is the Selective Catalytic Reduction (SCR) by use of Urea Water Solution (UWS). The benchmark of the effectiveness of such a system is even distribution of the ammonia at catalyst inlet and wall film formation risk. In order to assess those factors Computational Fluid Dynamic (CFD) tools are used. This study presents the numerical investigation on the SCR systems performance. With this work the influence of the UWS injection frequency on the ammonia distribution and wall film accumulation was studied. In addition, the behavior of those parameters over the time was analyzed in aspect of rise and stabilization time. The considered system setup was a typical closed coupled solution for light duty cars with Diesel Oxidation Catalyst (DOC) and Selective Catalytic Reduction on Filter (SCRoF) connected by transfer tube with UWS injector. Due to the limited space for urea decomposition and ammonia mixing the static mixing device was installed inside of the transfer tube. Conducted calculations showed that both, ammonia distribution and wall film formation depend on injection frequency. All simulations were performed in AVL Fire software.
Tematyka artykułu: Pomiary i kontrola emisji
Autor: Rafał Rogóż
Współautor(zy): Piotr Jaworski, Łukasz Jan Kapusta, Andrzej Teodorczyk