Journal of the Korean Society for Precision Engineering (한국정밀공학회지)

Korean Society for Precision Engineering (한국정밀공학회)
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Characterization of SCR System for NOx Reduction of Diesel Engine (II)

디젤엔진의 질소산화물 저감을 위한 Urea SCR 시스템 특성 분석 (II)

  • Lee, Joon-Seong (Dept. of Mechanical System Engineering, Kyonggi Univ.) ;
  • Kim, Nam-Yong (Dept. of Performance Research, Korea Automobile Research Institute)
  • 이준성 (경기대학교 기계시스템공학과) ;
  • 김남용 (자동차성능연구소 성능연구실)
  • Published : 2008.11.01
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Abstract

The Effect of Space Velocity(SV) on NOx conversion rate was performed to develop NOx reduction after-treatment system. SV is calculated from engine exhaust gas volume and SCR catalyst volume. Found the Urea injection duty of maximum efficiency for NOx conversion if increase SV, NOx Conversion rate is down. Especially, when SV is more than $110,000h^{-1}$, NOx conversion rate decrease suddenly. Same case, if SV is lower than $40,000h^{-1}$, NOx conversion rate is down. Also, the characterization of Urea-SCR system was performed. Three candidate injectors for injecting Urea were tested in terms of 속 injection rate and NOx reduction rate. The performances of SCR catalytic converter on temperature were investigated. The performance of Urea-SCR system was estimated in the NEDC test cycle with and without EGR. It was found that nozzle type injector had high NOx conversion rate. SCR catalytic converter had the highest efficiency at the temperature of $350^{\circ}C$. EGR+Urea-SCR system achieved NOx reduction efficiency of 73% through the NEDC test cycle.

Keywords

References

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