Browse > Article
http://dx.doi.org/10.3795/KSME-B.2015.39.1.001

Development and Validation of Urea- SCR Control-Oriented Model for NOX and NH3 Slip Reduction  

Lee, Seung Geun (Dept. of Automotive Engineering, Kookmin Nat'l Univ.)
Lee, Seang Wock (Dept. of Automotive Engineering, Kookmin Nat'l Univ.)
Kang, Yeonsik (Dept. of Automotive Engineering, Kookmin Nat'l Univ.)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.39, no.1, 2015 , pp. 1-9 More about this Journal
Abstract
To satisfy stricter $NO_X$ emission regulations for light- and heavy-duty diesel vehicles, a control algorithm needs to be developed based on a selective catalytic reaction (SCR) dynamics model for chemical reactions. This paper presents the development and validation of a SCR dynamics model through test rig experiments and MATLAB simulations. A nonlinear state space model is proposed based on the mass conservation law of chemical reactions in the SCR dynamics model. Experiments were performed on a test rig to evaluate the effects of the $NO_X$ and $NH_3$ concentrations, gas temperature, and space velocity on the $NO_X$ conversion efficiency for the urea-SCR system. The parameter values of the proposed SCR model were identified using the experimental datasets. Finally, a control-oriented model for an SCR system was developed and validated from the experimental data in a MATLAB simulation. The results of this study should contribute toward developing a closed-loop control strategy for $NO_X$ and $NH_3$ slip reduction in the urea-SCR system for an actual engine test bench.
Keywords
Selective Catalytic Reduction; $NO_X$ Reduction; Aftertreatment;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
1 Qingwen, S. and George, Z., 2002, "Model-based Closed-loop Control of Urea SCR Exhaust Aftertreatment System for Diesel Engine," SAE paper, 2002-01-0287.
2 Park, C. W., Kim, Ch. G., Choi, Y. and Kang, K. Y., 2009, "Performance of LNT Catalyst according to the Supply Condition of Hydrogen Reductants for Diesel Engine," KSAE, Vol. 17, No. 3, pp. 142-148   과학기술학회마을
3 Meisami-Azad, M., Mohammad-pour, J., Grigoriadis, K. M. and Harold, M. P., 2010, "An Adaptive Control Strategy for Urea-SCR Aftertreatment System," American Control Conference.
4 Piazzesi, G., Devadas, M., Krocher, O., Elsener, M. and Wokaun, A., 2006, "Isocyanic Acid Hydrolysis over Fe-ZAM5 in urea SCR", Catalysis Communications, Vol. 7, pp. 600-602.
5 Kim, J. Y., Ryu, S. H. and Ha, J. S., 2004, "Numerical Prediction on the Characteristics of Spray-induced Mixing and Thermal Decomposition of Urea Solution in SCR System," Proceeding of ASME Internal Combustion Engine Division.
6 Chatterjee, D., Burkhardt, T., Weibel, M., Tronconi, E., Nova, I. and Ciardelli, C., 2006, "Numerical Simulation of NO/$NO_2$-$NH_3$ Reaction on SCR-catalytic Converters: Model Development and Applications," SAE 2006 World Congress, SAE 2006-01-0468.
7 Strots, V. O., Santhanam, S., Adelman, B. J., Griffin, G. A. and Derybowski, E. M., 2009, "Deposit Formation in Urea-SCR Systems," SAE 2009 World Congress, SAE paper 2009-01-2780.
8 Willems, F., Cloudt, R., Eijnden, E., Genderen, M. and Verbeek, R., 2007, "Is Closed-loop SCR Control Required to Meet Future Emission Targets?", SAE paper 2007-01-1574.
9 Grossale, A., Nova, I., Tronconi, E., Chatterjee, D. and Weibel, M., 2008, "The Chemistry of the NO/NO2-NH3 "fast" SCR Reaction Over Fe-ZSM5 Investigated by Transient Reaction Analysis," Journal of Catalysts, Vol. 256, pp. 312-322.
10 Grossale, A., Nova, I. and Tronconi, E., 2008, "Study of a Fe-zeolite-based System as $NH_3$-SCR Catalyst for Diesel Exhaust Aftertreatment," Catalysis Today, Vol. 136, pp. 18-27.   DOI   ScienceOn
11 Nova, I., Ciardeli, C., Tronconi, E., Chatterjee, D. and Weibel, M., 2007, "$NH_3$-NO/$NO_2$ SCR for Diesel Exhausts After Treatment: Mechanism and Modeling of a Catalytic Converter," Topics in Catalysis, Vols. 42, pp. 43-46.
12 Upadhyay, D. and Van Nieuwstadt, M., 2002, "Modeling of a Urea SCR Catalyst with Automotive Application," Proceedings of the ASME International Mechanical Engineering Congress & Exposition.