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논문 기본 정보

자료유형
학술대회자료
저자정보
조낙원 (프론티스) 문성준 (한양대학교)
저널정보
대한기계학회 대한기계학회 춘추학술대회 대한기계학회 2018년도 학술대회
발행연도
2018.12
수록면
2,486 - 2,489 (4page)

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In order to reduce harmful gas, such as NOx, in diesel engine, urea water solution(UWS) is injected in front of SCR catalyst. UWS injection is controlled to be fully converted to NH₃ in consideration of exhaust gas temperature and NOx amount. However, due to the local concentration of the injected UWS and the miss injection due to the rapidly varying exhaust gas flow, a considerable amount of urea is adsorbed to the SCR monolith channel. The adsorbed urea is solidified by the high temperature exhaust gas and hydrolysis, reducing the effective flow area, and becomes an medium of heat conduction to increase the heat loss of the SCR catalyst. Therefore, In this study, in order to analyze the heat loss by the adsorbed urea, 3D CFD analysis is performed over single SCR monolith channel by using ANSYS Fluent v19.1 code. And experimentally measured temperature is applied as a time-space profile to consider actual ambient temperature variation of the SCR catalyst. As a result, the heat flux of plugged condition 1, in which urea adsorption occurs as the inlet of the 1st monolith channel, decreased to about 12.85% at 5.0 sec compare to the normal condition, and the heat flux of plugged condition 2, in which urea adsorption occurred in the center of the 1st monolith channel, decreased to abount 49.97% at 5.0 sec compare to the normal condition. In conclusion, the heat losses of plugged condition 1 and plugged condition 2 were increased about 89.86% and 59.50% respectively, compared to the normal conditions at 50.0 sec.

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Abstract
1. 서론
2. 수치 해석
3. 해석 결과
4. 결론
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