This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
3-D Numerical Study of Flow Mixing in Front of SCR for Different Injection Systems
Technical Paper
2007-01-1578
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
The urea Selective Catalytic Reduction (SCR) exhaust system has been proved to be the reliable aftertreatment device with the capability of reducing tail pipe NOx emission by 75% to 90%, HC by 50% and Particulate Matter (PM) by 30%. Constrained by increasingly stringent packaging envelope, flow mixing in front of substrate is becoming one of the major concerns to achieve ideal performance of higher NOx conversion and lower ammonia (NH3) slip. Three dimensional CFD simulations are performed in current study to investigate flow mixing phenomenon in a SCR system. First, for a traditional tube injector with single or multiple nozzles, the effects of mass flow rates of injected NH3 and exhaust gas on flow mixing and pressure loss are investigated. Then, a concept of ring shape injector with multiple nozzles are initiated and built for 3-D CFD simulations. The comparisons of flow mixing index and injection pressure are made between two type injectors. Next, the locations of nozzles in ring injector are studied and the effect on flow mixing index and NH3 injection pressure are addressed. The optimal nozzle locations are found. Finally, the effect of a swirling flow, which can be generated by a span element or flow mixer in front of substrate, is studied and the enhancement on flow mixing index is discussed.
Recommended Content
Topic
Citation
Zhang, X. and Romzek, M., "3-D Numerical Study of Flow Mixing in Front of SCR for Different Injection Systems," SAE Technical Paper 2007-01-1578, 2007, https://doi.org/10.4271/2007-01-1578.Also In
References
- Song Qingwen Zhu George Model-based Closed-loop Control of Urea SCR Exhaust Aftertreatment System for Diesel Engine SAE, 2002-01-0287
- Zhang Xiaogang Romzek Martin Keck Mathias Frank Kurz Numerical Optimization of Flow Uniformity inside Diesel Particular Filters SAE, 2005-01-3702
- Chen Ming Williams Shazam Modelling and Optimization of SCR-Exhaust Aftertreatment Systems SAE, 2005-01-0969 2005
- Wurzenberger Johann C. Wanker Roland Multi-Scale Scr Modelling, 1d Kinetic Analysis and 3d System Simulation SAE, 2005-01-0948 2005
- Van Helden Rinie Verbeek Ruud P. Optimization of Urea Scr Denox Systems for Hd Diesel Engines SAE, 2004-01-0154 2004
- Birkhold Felix Meingast Ulrich Wassermann Peter Deutschmann Olaf Analysis of the Injection of Urea-Water-Solution for Automotive SCR DeNOx-Systems: Modeling of Two-Phase Flow and Spray/Wall-Interaction SAE, 2006-01-0643 2006
- Jeong Soo-Jin Lee Sang-Jin Kim Woo-Seung Lee Chunboem Simulation on the Optimum Shape and Location of Urea Injector for Urea-SCR System of Heavy-Duty Diesel Engine to Prevent NH3 Slip SAE, 2005-01-3886 2005
- Zhang Xiaogang Romzek Martin Karonis Pete Morgan Chris 3-D Numerical Study of Mixing Characteristics of NH3 in front of SCR SAE, 2006-01-3444 2006
- Fluent 6.2 Fluent Inc. 2005