Abstract
For efficient reduction of nitrogen oxides in selective catalytic reduction systems, the injected urea water solution must be converted almost 100% to ammonia for a short time. This paper presented the effects of mixer configuration on the urea water solution evaporation and mixing process in a selective catalytic reduction system, using numerical analysis tool of ANSYS FLUENT R15.0. The results of numerical analysis were compared to experimental results for verifying the numerical reliability. Compared to the case without the mixer, in case of the vane type mixer was installed, the conversion rate of NH₃ increased by 21.4% and uniformity by 48.9%. In addition, when the injection angle of the urea-water-solution was 45° based on the exhaust gas flow direction, the conversion rate of NH3 was highest as 89.0%, and the uniformity was highest as 52.5% at 15°. In this study, proposed a method to convert urea solution rapidly, and it is expected that this results could be used to reduce ammonia slip in SCR systems.
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