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A Study on the Injection Characteristics of Urea Solution to Improve deNOx Performance of Urea-SCR Catalyst in a Heavy Duty Diesel Engine  

Jeong, Soo-Jin (Advanced Power & IT Research Center, Korea Automotive Technology Institute)
Lee, Chun-Hwan (Environmental Parts R & D Center, Korea Automotive Technology Institute)
Publication Information
Transactions of the Korean Society of Automotive Engineers / v.16, no.4, 2008 , pp. 165-172 More about this Journal
Abstract
Urea-SCR, the selective catalytic reduction using urea as reducing agent, has been investigated for about 10 years in detail and today is a well established technique for deNOx of stationary diesel engines. In the case of the SCR-catalyst a non-uniform velocity and $NH_3$ profile will cause an inhomogeneous conversion of the reducing agent $NH_3$, resulting in a local breakthrough of $NH_3$ or increasing NOx emissions. Therefore, this work investigates the effect of flow and $NH_3$ non-uniformities on the deNOx performance and $NH_3$ slip in a Urea-SCR exhaust system. From the results of this study, it is found that flow and $NH_3$ distribution within SCR monolith is strongly related with deNOx performance of SCR catalyst. It is also found that multi-hole injector shows better $NH_3$ uniformity at the face of SCR monolith face than one hole injector.
Keywords
Urea-SCR; Diesel engine; Urea-water-solution; Thermal decomposition; Injection; Computational fluid dynamics(CFD);
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Times Cited By KSCI : 1  (Citation Analysis)
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