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논문 기본 정보

자료유형
학술대회자료
저자정보
Myung-whan Bae (경상대학교) Syaiful
저널정보
대한기계학회 대한기계학회 춘추학술대회 대한기계학회 2008년도 춘계학술대회 논문집
발행연도
2008.6
수록면
684 - 690 (7page)

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Selective catalytic reduction (SCR) is known as one of promising methods for reducing NO<SUB>x</SUB> emissions in diesel exhaust gases. NO<SUB>x</SUB> emissions react with ammonia in the catalyst surface of SCR system at working temperature of catalyst. The problem arises, in this case, when the diesel exhaust gas temperature is low. To overcome this problem, catalytic filters have been developed by many researchers which can be optimally operated at low temperature. However, if the exhaust gas temperature is too low, implementing a heater is necessary for keeping the adequate reacting temperature. In this study, to raise the reacting temperature when the exhaust gas temperature is too low, a heater is located at the bottom of SCR reactor. At an ambient temperature, ammonia is radially injected perpendicular to the exhaust gas flow at inlet pipe and uniformly mixed in the mixing area after impinging against the wall. To predict the turbulent model inside the mixing area of SCR system, the standard κ-ε is applied. This work investigates numerically the effects of induced heat on the gaseous flow. The results show that the Taylor-Gortler type vortex is generated after the gaseous flow impinges the wall in which these vortices influence the temperature distribution. The addition of heat disturbs the flow structure in bottom area and then stretching flow occurs. Vorticity strand is also formed when heat is continuously increased. Constriction process takes place, however, when a further heat input over a critical temperature is increased and finally forms shed vortex which is disconnected from the vorticity strand. The strong vortex restricts the heat transport in the gaseous flow.

목차

Abstract
1. INTRODUCTION
2. SCR CATALYTIC FILTER DEVICE
3. MODELING
4. RESULTS AND DISCUSSION
5. CONCLUSIONS
Acknowledgements
REFERENCES

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