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A Combined 3D/Lumped Modeling Approach to Ammonia SCR After-treatment Systems: Application to Mixer Designs
Technical Paper
2006-01-0469
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
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.
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Authors
- Mikael Karlsson - Swenox AB
- Ulf Wallin - Swenox AB
- Sten Fredholm - Swenox AB
- Jonas Jansson - Volvo Powertrain Corporation
- Gert-Ove Wahlström - Volvo Powertrain Corporation
- Christoph M. Schär - Measurement and Control Laboratory, Swiss Federal Institute of Technology (ETH)
- Christopher H. Onder - Measurement and Control Laboratory, Swiss Federal Institute of Technology (ETH)
- Lino Guzzella - Measurement and Control Laboratory, Swiss Federal Institute of Technology (ETH)
Topic
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.Also In
References
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- Schär, C.M. Control of a Selective Catalytic Reduction Process ETH Zurich 2003 Dissertation No. 15221
- Berkman M. E. Katari A. Transient CFD: How Valuable is It for Catalyst Design? SAE Paper 2002-01-0064
- Schär C. M. et al. Control-Oriented Model of An SCR Catalytic Converter System SAE paper Nr. 2004-01-0153 Detroit March 2004
- Wurzenberger J. C. Wanker R. Multi-Scale SCR modeling 1D kinetic analysis and 3D system simulation SAE paper Nr. 05-FL-215 Detroit April 2005
- York A.P.E. et al Modeling an ammonia SCR DeNOx catalyst: model development and validation SAE paper 2004-01-0155 Detroit March 2004