Effect of Space Velocity on the DeNOx Performance in Diesel SCR After-Treatment System

디젤 SCR 후처리장치 내 공간속도가 NOx 저감에 미치는 영향

  • 왕태중 (한국과학기술원 기계공학과) ;
  • 백승욱 (한국과학기술원 기계공학과) ;
  • 강대환 (오덱(주) 기술연구소) ;
  • 길정기 (현대자동차(주) 배기연구팀) ;
  • 여권구 (현대자동차(주) 배기연구팀)
  • Published : 2006.04.14

Abstract

The present study conducted a numerical modeling on the diesel SCR (selective catalytic reduction) system using ammonia as a reductant over vanadium-based catalysts $(V_2O_5-WO_3/TiO_2)$. Transient modeling for ammonia adsorption/desorption on the catalyst surface was firstly carried out, and then the SCR reaction was modeled considering for it. In the current catalytic reaction model, we extended the pure chemical kinetic model based on laboratory-scale powdered-phase catalyst experiments to the chemico-physical one applicable to realistic commercial SCR reactors. To simulate multi-dimensional heat and mass transfer phenomena, the SCR reactor was modeled in two dimensional, axisymmetric domain using porous medium approach. Also, since diesel engines operate in transient mode, the present study employed an unsteady model. In addition, throughout simulations using the developed code, effects of space velocity on the DeNOx performance were investigated.

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