Journal of ILASS-Korea (한국분무공학회지)

Institute for Liquid Atomization and Spray Systems-Korea (한국분무공학회)
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Development of NO2/NOx Ratio Estimation Model for Urea-SCR System Application on Non-road Diesel Engine

비도로용 디젤엔진의 Urea SCR system 적용을 위한 NO2/NOx ratio 예측모델 개발에 관한 연구

  • 강석호 (건설기계부품연구원 친환경에너지연구실) ;
  • 김훈명 (한국자동차연구원 동력성능연구센터) ;
  • 강정호 (한국자동차연구원 동력성능연구센터) ;
  • 박은용 (테스크 기술연구소) ;
  • 권오현 (대동공업 엔진개발팀) ;
  • 김대열 (동양미래대학교 기계공학과)
  • Received : 2020.08.27
  • Accepted : 2020.10.07
  • Published : 2020.12.31
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Abstract

The current emission regulations, US Tier-4 and EU Stage-V, are only able to satisfy the regulations when all currently mass-produced emission reduction technologies such as EGR, DOC, DPF, and SCR are applied. Therefore, in this study, for the application of the Urea-SCR system to non-road diesel engines, the database was established by measuring the NO, NO2 concentration and calculating the NO2/NOx ratio based on the catalyst temperature and exhaust mass flow rate. Also, based on the measured NO2/NOx ratio data, a mathematical model was proposed to predict the NO2/NOx ratio at SCR catalyst, and the suitability of the model was verified through steady-state and transient mode. As a result of comparing the NO2/NOx ratio measured at the DOC outlet under the steady-state condition to two model values separately, the R2 was 0.9811 for the 3D map model and 0.9303 for the mathematical model. And in the case of the NO2/NOx ratio measured at the DPF outlet, the R2 was 0.9797 for the 3D map model and 0.935 for the mathematical model. It was confirmed that the R2 with the model value of the 3D Map of the mathematical model in the transient mode is 0.957, which shows high reliability.

Keywords

References

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