Browse > Article
http://dx.doi.org/10.15207/JKCS.2019.10.4.131

A Convergence Study on the Effects of NH3/NOx Ratio and Catalyst Type on the NOx Reduction by Urea-SCR System of Diesel Engine  

Yoon, Heung-Soo (Dept. of Security and Management Engineering, Graduate School, Myongji University)
Ryu, Yeon-Seung (Dept. of Security and Management Engineering, Graduate School, Myongji University)
Publication Information
Journal of the Korea Convergence Society / v.10, no.4, 2019 , pp. 131-138 More about this Journal
Abstract
Diesel engines have important advantages over its gasoline counterpart including high thermal efficiency, high fuel economy and low emissions of CO, HC and $CO_2$. However, NOx reducing is more difficult on diesel engines because of the high $O_2$ concentration in the exhaust, marking general three way catalytic converter ineffective. Two method available technologies for continuous NOx reduction onboard diesel engines are Urea-SCR and LNT. The implementation of the Urea-SCR systems in design engines have made it possible for 2.5l and over engines to meet the tightened NOx emission standard of Euro-6. In this study, we investigate the characteristics of NOx reduction with respect to engine speed, load, types of catalyst and the $NH_3$/NOx ratio and present the conditions which maximize NOx reduction. Also we provide detailed experimental data on Urea-SCR which can be used for the preparation for standards beyond Euro-6.
Keywords
Selective Catalytic Reduction(SCR); Ammonia($NH_3$); Cu-CHA catalysts; Cu-ZSM-5 catalysts; Euro-6;
Citations & Related Records
연도 인용수 순위
  • Reference
1 B. Yun, C. Kim, M. Kim, G. Cho, H. Kim & Y. Jeong. (2010). Numerical Modeling of Vanadia-based Commercial Urea-SCR plus DOC Systems for Heavy-duty Diesel Exhaust Aftertreatment Systems. Transactions of KSAE, 18(2), 24-30.
2 Dieter H. E. Seher, Michael Reichelt & Stefan Wickert. (2003). Control Strategy for NOx - Emission Reduction with SCR. SAE 2003-01-3362.
3 L. Sharifian, Y. M. Wright & K. Boulouchos. (2011). Transient simulation of NOx reduction over a Fe-Zeolite catalyst in an $NH_3$-SCR system and study of the performance under different operating conditions. SAE 2011-01-2084.
4 G. R. Chandler, B. JCooper, J. P. Harris, J. E. Thoss, A. Uusimaki, A. P. Walker & J. P. Warren. (2000). An Integrated SCR and Continuously Regenerating Trap System to Meet Future NOx and PM Legislation. SAE 2000-01-0188.
5 A. Herman, M. C. Wu, D. Cabush & M. Shost. (2009). Model Based Control of SCR Dosing and OBD Strategies with Feedback from $NH_3$ Sensors. SAE 2009-01-0911.
6 J. Hu, Y. Zhao, Y. l. Zhang, S. Shuai, J. X. Wang, T. Chen & Z. Chen. (2011). Development of Closed-loop Control Strategy for Urea-SCR Based on NOx Sensors. SAE 2011-01-1324.
7 J. S. Lee & N. Y. Kim. (2008). Characterization of SCR System for NOx Reduction of Diesel Engine (II). Transactions of KSPE, 25(11), 83-89.
8 G. Madia, M. Manfred, M. Elsener & A. Wokaun. (2002). The Effect on an Oxidation Precatalyst on the NOx Reduction by Ammonia SCR. Ind. Eng. Chem. Res. 41(15), 3512-3517.   DOI
9 Y. J. Cha. (2013). An Experimental Study on NOx Reduction Characteristics using Zeolite Based Catalyst. Kookmin Univ..
10 M. J. Song. (2013). A Numerical Analysis on $NH_3$ Flow Uniformity Depending on the Changes In shape a Diffuser and Mixer. Kookmin Univ.
11 D. Chatterjee, T. Burkhardt, T. Rappe, A.Guthenke & M. Weibel. (2008). Numerical Simulation of DOC+DPF+SCR Systems: DOC Influence on SCR Performance. SAE 2008-01-0867.
12 H. J. Kim. (2014). An Experimental Study on Charateristics of NOx Reduction with Urea-SCR System depending on EGR Type and a ratio in Passenger Diesel Engine. Kookmin Univ.
13 John. B. Heywood. (1998). Internal Combustion Engine Fundamentals, 491-566. McGraw-Hill.
14 Kraftfahrt-Bundesamt(KBA). (2008). Fuel consumption in MNEDC, at least EU4 certification.
15 S. Jung & W. Yoon. (2008). Modeling of $NH_3$-SCR Diesel NOx Reduction and Effects of $NO_2$/NOx, $NH_3$/NO Ratio on the DeNOx Efficiency. Transactions of KSAE, 16,(3), 179-187.