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학술대회자료
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한국자동차공학회 한국자동차공학회 춘 추계 학술대회 논문집 한국자동차공학회 2008년 창립 30주년 기념 학술대회 논문집Volume IV
발행연도
2008.4
수록면
1,691 - 1,698 (8page)

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Selective catalytic reduction (SCR) is a leading after-treatment technology for reducing NO<SUB>x</SUB> emissions among exhaust gases in combustors. The purpose of this study is to develop SCR catalytic filter system for reducing NO<SUB>x</SUB> and soot emissions simultaneously in diesel combustion devices. SCR catalysts are used to reduce NO<SUB>x</SUB> emissions. And the novel catalytic filters inside SCR system devised by authors are specially designed and manufactured to reduce soot particles. The working temperature distribution along the surface of SCR catalytic filter is one of the important parameters for converting NO<SUB>x</SUB> to N₂ by reacting with the injected ammonia. The working temperature distribution and velocity field of gaseous flow in SCR device are investigated by numerical simulation in this study. Three catalytic filters are vertically located to the face of mixing length inside SCR system at 120° interval of horizontal section. In order to predict turbulent flow, k - ε standard turbulent model is applied. Ammonia is radially injected perpendicular to the exhaust gas flow in inlet pipe and mixes with exhaust gases in the mixing area. A heater is implemented in this simulation to heat up the gaseous flow reaching for the working temperature of SCR MnO₂-V₂O?-WO₃/TiO₂/SiC catalytic filters. The results of this study show that the working temperature distribution around each catalytic filter is different because it is influenced by velocity field of gaseous flow in mixing area of SCR device. Thus one can conclude that NO conversion in each catalytic filter of SCR system is different due to the variation of working temperature distribution.

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Abstract
1. INTRODUCTION
2. SCR SYSTEM
3. MODELING
4. RESULTS AND DISCUSSION
5. CONCLUSIONS
ACKNOWEDGMENT
REFERENCES

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