A Combined 3D/Lumped Modeling Approach to Ammonia SCR After-treatment Systems: Application to Mixer Designs

2006-01-0469

04/03/2006

Event
SAE 2006 World Congress & Exhibition
Authors Abstract
Content
In practical applications of ammonia SCR aftertreatment systems using urea as the reductant storage compound, one major difficulty is the often constrained packaging envelope. As a consequence, complete mixing of the urea solution into the exhaust gas stream as well as uniform flow and reductant distribution profiles across the catalyst inlet face are difficult to achieve.
This paper discusses a modeling approach, where a combination of 3D CFD and a lumped parameter SCR model enables the prediction of system performance, even with non-uniform exhaust flow and ammonia distribution profiles. From the urea injection nozzle to SCR catalyst exit, each step in the modeling process is described and validated individually. Finally the modeling approach was applied to a design study where the performance of a range of urea-exhaust gas mixing sections was evaluated.
The application to the design study shows that this combination of tools, CFD and lumped parameter SCR model, gives accurate predictions of the effects of design changes to the actual hardware on the overall performance.
Meta TagsDetails
DOI
https://doi.org/10.4271/2006-01-0469
Pages
12
Citation
Karlsson, M., Wallin, U., Fredholm, S., Jansson, J. et al., "A Combined 3D/Lumped Modeling Approach to Ammonia SCR After-treatment Systems: Application to Mixer Designs," SAE Technical Paper 2006-01-0469, 2006, https://doi.org/10.4271/2006-01-0469.
Additional Details
Publisher
Published
Apr 3, 2006
Product Code
2006-01-0469
Content Type
Technical Paper
Language
English