This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Comparison Between Air-Assisted and Airless Urea Spray for Diesel SCR System by PDA and CFD
Technical Paper
2012-01-1081
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
The urea NOx selective catalytic reduction (SCR) is an effective technique for the reduction of NOx emitted from diesel engines. Urea spray quality has significant effect on NOx conversion efficiency. The droplet diameter and velocity distribution of air-assisted and airless urea injection systems were obtained by particle dynamics analyzer (PDA) measurement under different spray injection flow rates. It was found that the atomization quality of air-assisted urea injection system is better than that of airless urea injection system. The penetration and spray cone angle were also investigated by high-speed photography. Especially the spray characteristics of air-assisted urea injection system were measured in the constant-volume-bomb by high-speed photography. The atomization and evaporation of airless urea injection systems were modeled using computational fluid dynamics (CFD) based on the experimental results. The numerical model was validated by the experimental results. The numerical results under the different boundary conditions and injection positions of nozzles were compared in order to optimize the spray characteristics and increase the conversion efficiency of NOx.
Recommended Content
Authors
Topic
Citation
Hua, L., Zhao, Y., Hu, J., Tao, T. et al., "Comparison Between Air-Assisted and Airless Urea Spray for Diesel SCR System by PDA and CFD," SAE Technical Paper 2012-01-1081, 2012, https://doi.org/10.4271/2012-01-1081.Also In
References
- Flynn, P. Hunter, G. Durrett, R. Farrell, L. et al. “Minimum Engine Flame Temperature Impacts on Diesel and Spark-Ignition Engine NOx Production,” SAE Technical Paper 2000-01-1177 2000 10.4271/2000-01-1177
- Sharp, C. Howell, S. Jobe, J. “The Effect of Biodiesel Fuels on Transient Emissions from Modern Diesel Engines, Part I Regulated Emissions and Performance,” SAE Technical Paper 2000-01-1967 2000 10.4271/2000-01-1967
- United States Environmental Protection Agency A comprehensive analysis of biodiesel impact on exhaust emissions Draft Technical Report EPA420-P-02-001 2002
- Koebel, M. Elsener, M. Marti, T. NOx-reduction in diesel exhaust gas with urea and Selective Catalitic Reduction Comb. Sci. and Techn. 121 1996 85 102
- Yim, D.S. Kim, S.J. Baik, J.H. Nam, I. Mok, Y.S. Lee, J.W. Cho, B.K. Oh, S.H. Decomposition of Urea into NH3 for the SCR Process Ind.Eng.- Chem.Res. 43 1 2004 4856 4863
- Koebel, M. Elsener, M. Kleemann, M. Urea-SCR: a promising technique to reduce NOx emissions from automotive diesel engines Catalysis Today 59 2000 335 345
- Koebel, M Elsener, M Madia, G. Reaction pathways in the selective catalytic reduction process with NO and NO2 at low temperatures Ind Eng Chem Res. 2001 40 52 59
- Johnson, T. “Diesel Emission Control in Review,” SAE Int. J. Fuels Lubr. 2 1 1 12 2009 10.4271/2009-01-0121
- Strots, V. Santhanam, S. Adelman, B. Griffin, G. et al. “Deposit Formation in Urea-SCR Systems,” SAE Int. J. Fuels Lubr. 2 2 283 289 2010 10.4271/2009-01-2780
- Xu, L. Watkins, W. Snow, R. Graham, G. et al. “Laboratory and Engine Study of Urea-Related Deposits in Diesel Urea-SCR After-Treatment Systems,” SAE Technical Paper 2007-01-1582 2007 10.4271/2007-01-1582
- Schaber, P.M. Colson, J. Higgins, S. Dietz, E. Thielen, D. Anspach, B. Brauer, J. 1999 Study of the urea thermal decomposition (pyrolysis) reaction and importance to cyanuricacid production Am. Lab. 31 13
- Gentemann, A.M.G. Caton, J.A. 2001 Decomposition and oxidation of a urea-water solution as used in selective noncatalytic removal (SNCR) processes Proceedings of the 2001 Technical Meeting of the Joint United States Sections of the Combustion Institute. 2001 Spring Technical Conference
- Deur, J.M. Jonnavithula, S. Dhanapalan, S. Schulz, K. Raghunathan, B. NAKLA, H. Meeks, E. Chou, C.P. 2002 Simulation of engine exhaust aftertreatment with CFD using detailed chemistry Proceedings of 12th International Multidimensional Engine Modeling User's Group Engine Research Center Detroit, MI, USA
- van Helden, R. Verbeek, R. Willems, F. van der Welle, R. “Optimization of Urea SCR deNOx Systems for HD Diesel Engines,” SAE Technical Paper 2004-01-0154 2004 10.4271/2004-01-0154
- Jeong, S.J. Kim, W.S. 2003 A study on the optimal monolith combination for improving flow uniformity and warm up performance of an auto-catalyst Chem. Eng. Process. 42 879
- Munnannur, A Liu, ZG A multi-dimensional model for DEF injection and urea decompose-tion in mobile SCR DeNOx systems Proceedings of 4th Biennial Conf. Addressing Today's Challenges and Future Needs: Emission Solutions in Transportation Ann Arbor, MI 2009
- Munnannur, A. Liu, Z. “Development and Validation of a Predictive Model for DEF Injection and Urea Decomposition in Mobile SCR DeNOx Systems,” SAE Technical Paper 2010-01-0889 2010 10.4271/2010-01-0889
- Birkhold, F. Meingast, U. Wassermann, P. Deutschmann, O. “Analysis of the Injection of Urea-Water-Solution for Automotive SCR DeNOx-Systems: Modeling of Two-Phase Flow and Spray/Wall-Interaction,” SAE Technical Paper 2006-01-0643 2006 10.4271/2006-01-0643
- Birkhold, F Meingast, U Wassermann, P Deutschmann, O Modeling and simulation of the injection of urea-water-solution for automotive SCR DeNOx-systems Appl Catal B Environ. 2007 70 119 127
- Jeong, Soo-Jin Lee, Sang-Jin Kim, Woo-Seung Numerical study on the optimum injection of urea-water solution for SCR DeNOx system of a heavy-duty diesel engine to improve DeNOx performance and reduce NH3 slip Environmental Engineering Science 2008 25 1017 1035