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Abstract: Recently the SCR system is spotlighted due to reduction policy of the NOx. The NOx is ingredient in the formation of smog and acid rain. Urea-SCR system is known as the most efficient method to resolve the problem of NOx emission.
The process of urea water solution (UWS) evaporation and mixing is important in SCR system. Optimizing the injection of UWS is influenced by multiple factors such as gas temperature, injector angle and mixer configuration. Especially effects of mixer configuration on flow mixing of
UWS in SCR system are important. Therefore, it is necessary to analyze the flow mixing characteristic using computational fluid dynamics (CFD) tool. The flow mixing characteristics for UWS was analyzed according to mixer configuration in a straight SCR duct using ANSYS FLUENT tool.
In this paper it was compared the effect of mixer configuration, injection angle and gas temperature on the flow mixing characteristics of UWS such as conversion ratio and uniformity of NH3 in a SCR system. As a result in
case of vane type mixer the NH3 conversion ratio and uniformity increased 27.86% and 97.22% respectively.

URI: https://repository.pknu.ac.kr:8443/handle/2021.oak/13260
http://pknu.dcollection.net/jsp/common/DcLoOrgPer.jsp?sItemId=000002299668

Table Of Contents: 1. 서 론 1
1.1 연구 배경 1
1.2 연구 목적 3
2. 이론 해석 5
2.1 디젤기관의 NOx 생성 및 저감 5
2.1.1 NOx의 생성 5
2.1.2 NOx의 저감 기술 8
2.2 Urea-SCR 시스템 10
2.2.1 화학 반응식 10
2.2.2 SCR 촉매 12
2.3 지배 방정식 14
2.3.1 난류 모델 14
2.3.2 분사 모델 16
2.3.3 증발 모델 17
2.3.4 벽막 모델 19
3. 수치해석 23
3.1 수치해석 기법 23
3.2 CFD 모델링 24
3.3 수치해석 조건 25
3.3.1 믹서 형상 25
3.3.2 요소 수용액 분사 각도 27
3.3.3 배기가스 온도에 따른 NH3의 변환율 28
3.3.4 배기가스 속도에 따른 NH3의 변환율 28
3.4 수치해석 신뢰성 검증 29
4. 결과 및 고찰 33
4.1 믹서 형상에 따른 결과 33
4.2 요소 수용액 분사 각도에 따른 결과 44
4.3 배기가스 온도에 따른 NH3의 변환율의 해석 결과 46
4.4 배기가스 속도에 따른 NH3의 변환율의 해석 결과 49
5. 결 론 51
참고 문헌 53

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