Simulation of Various SCR Technologies Applied to a 2 L Diesel Engine Model to Evaluate DeNOx Performance at Low and High Temperatures

Jonathan  Brown, Gamma Technologies, Inc.

Simulation of Various SCR Technologies Applied to a 2 L Diesel Engine Model to Evaluate DeNOx Performance at Low and High Temperatures

Tian Gu, University of Houston
Dominik Artukovic, Gamma Technologies, GmbH
Jonathan Brown, Gamma Technologies, Inc.
Richard Blint, N2Kinetics Research, LLC

Urea SCR technology used on small passenger car diesel engines has a capital cost penalty due to the dosing system. Consequently the cost needs to be justified through increased efficiency and lower operating cost (urea cost vs. PGM cost and fuel penalty of LNT). In addition, with increasing use of engine start and stop technology the aftertreatment system must be designed to operate with high NOx conversion efficiency at both low and high temperatures. This modeling study examines the application of various SCR aftertreatment technologies to a production Ford European 2 L diesel engine. Specifically, variations of the SCR models developed by Metkar et al [1] (Cu Chabazite, Fe Zeolite, series combination, and dual layer combination) are applied to an engine model developed from the detailed engine map data from Robinson et al [2]. The aftertreatment system uses an upstream DOC and a downstream SCR with urea injection. The DOC model of Sampara et al [3,4] is used and calibrated to the measured DOC-out data from Robinson et al [2]. The complete system model will then be used to simulate both cold and hot NEDC conditions. This presentation will discuss:

• Development of a diesel engine model, which is used to predict the exhaust gas temperature, flow rate, and species concentrations upstream of the DOC
• Application and evaluation of Cu Chabazite, Fe Zeolite, series combination, and dual layer combination models during the NEDC
• Evaluation of the urea dosing response during the cold and hot NEDC simulations

[1] "Experimental and kinetic modeling study of NH3-SCR of NOx on Fe-ZSM-5, Cu-chabazite and combined Fe-and Cu-zeolite monolithic catalysts," Metkar, P. S., Balakotaiah, V., & Harold, M. P., 2013, Chemical Engineering Science, 87, 51-66.

[2] "Application of a methodology to assess the performance of a full-scale diesel oxidation catalyst during cold and hot start NEDC cycles," Robinson, K., Ye, S., Yap, Y., Kolaczkowski, S., 2013, Chemical Engineering Research and Design, 91, 1291-1306.

[3] "Global Kinetics for a Commercial Diesel Oxidation Catalyst with Two Exhaust Hydrocarbons," Sampara, C., Bissett, E., and Chmielewski, M., 2008, Ind. Eng. Chem. Res., 47, 311-322.
[4] "Hydrocarbon storage modeling for diesel oxidation catalysts," Sampara, C., Bissett, E., and Assanis D., 2008, Chemical Engineering Science, 63, 5179-5192.

Download Presentation: