Browse > Article
http://dx.doi.org/10.7467/KSAE.2012.20.2.070

A Study on the PCD Plasma System as an After Treatment Apparatus in Diesel Engine  

Ryu, Kyung-Hyun (School of Mechanical & Automotive Engineering, Kunsan National University)
Publication Information
Transactions of the Korean Society of Automotive Engineers / v.20, no.2, 2012 , pp. 70-77 More about this Journal
Abstract
The selective catalytic reduction(SCR) system used to reduce NOx in diesel engines requires an NO/$NO_2$ ratio of about 1 in exhaust emissions to realize the fast SCR mode at temperatures lower than $300^{\circ}C$. This study investigated the characteristics of a plasma system as a pre-active apparatus for the fast SCR reaction mode of an SCR system. Plasma was generated by the pulse corona discharge(PCD) method with a four-channel wire-cylinder reactor. This study showed that plasma was easily generated in the exhaust gas by the PCD system, and the peak voltage of the normal state condition for plasma generation was generally 12 kV. The PCD system easily converted NO into $NO_2$ at lower temperatures and the NO/$NO_2$ conversion ratio increased with the discharge current for plasma generation. But the PCD system could not convert NO into $NO_2$ at higher engine speeds and higher engine loads due to the lack of oxygen in exhaust gas. The PCD system also activated the diesel oxidation catalysts(DOC) system to reduce CO emissions.
Keywords
Diesel engine; Plasma; Pulse corona discharge; SCR; NOx;
Citations & Related Records
연도 인용수 순위
  • Reference
1 G. Madia, N. Koebel, M. Elsener and A. Wokaun, "The Effect of and Oxidation Precatalyst on the NOx Reduction by Ammonia SCR," Ind. Eng. Chem. Res., Vol.41, pp.3512-3517, 2002.   DOI
2 S. Jung and W. Yoon, "The Effect of an Oxidation Precatalyst on the NOx Reduction by $NH_3$-SCR Process in Diesel Exhaust," Transactions of KSAE, Vol.16, No.5, pp.68-76, 2008.
3 K. Ryu, J. Park, K. Choi, D. Seok and B. Lee, "An Experimental Study on the Plasma System as an After Treatment Apparatus in Diesel Engine," Annual Conference Proceedings, KSAE, pp.838-843, 2009.
4 http://www.dieselnet.com
5 J. G. Nam, "Statice Characteristics of a Urea-SCR System for NOx Reduction in Diesel Engines," Int. J. Automotive Technology, Vol.9, No.3, pp.283-288, 2007.
6 M. Koebel, M. Elsener and G. Madia, "Reduction Pathways in the Selective Catalytic Reduction Process with NO and $NO_2$ at Low Temperatures," Ind. Eng. Chem. Res., Vol.40, pp.52-59, 2001.   DOI   ScienceOn
7 H. Kim, Y. Jeong, M. Song and S. Lee, "Influentail Factors for NOx Reduction Performance of Urea-SCR System for and In-use Medium Duty Diesel Engine," Transactions of KSAE, Vol.17, No.1, pp.154-161, 2009.
8 Y. Ham, S. Lee, H. Jung and D. Shin, "Experimental Study on DeNOx Characteristics of Urea-SCR System," Transactions of KSAE, Vol.17, No.2, pp.180-186, 2009.