Transactions of the Korean Society of Automotive Engineers (한국자동차공학회논문집)

The Korean Society of Automotive Engineers (한국자동차공학회)
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Unified Modeling and Performance Prediction of Diesel $NO_x$ and PM Reduction by DOC-DPF-SCR System

DOC-DPF-SCR 시스템에 의한 디젤 배기 내 $NO_x$, 입자상 물질 저감 과정의 일관 모델링 및 성능 예측

  • Jung, Seung-Chai (Department of Mechanical Engineering, Graduated School, Yonsei University) ;
  • Yoon, Woong-Sup (Department of Mechanical Engineering, Yonsei University)
  • 정승채 (연세대학교 기계공학과 대학원) ;
  • 윤웅섭 (연세대학교 기계공학과)
  • Published : 2008.07.01
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Abstract

Computer methods with simplified mathematical models in conjunction with empirical model parameters can be efficiently practiced into an optimization of a diesel aftertreatment system. Components of prime interests are diesel particulate filter, diesel oxidation catalyst and de-$NO_x$ catalytic converter. de-$NO_x$, de-PM, and de-HC processes in each part are individually modeled, formulated and then combined into an integrated analysis procedure for a unified simulation of the diesel emission aftertreatment. The model is empirically tuned and validated with comprehensive engine and laboratory data. The effects of emission species and space velocity on the $NO_x$ and soot reductions are parametrically investigated. A lowered $NO_2/NO_x$ ratio due to PM oxidation in DPF contributes to promote the $NO_x$ reduction by SCR at intermediate gas temperatures. $NO_x$ reduction is inert to the PM oxidation at high temperatures. Rate of PM trapping strongly depends on temperature and $NO_x$ concentration.

Keywords

References

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