Journal of Advanced Marine Engineering and Technology

The Korean Society of Marine Engineering (한국마린엔지니어링학회)
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Effect of Mixer Structure on Turbulence and Mixing with Urea-water Solution in Marine SCR System

선박용 SCR 시스템에서 혼합기 구조에 따른 난류유동과 우레아 수용액의 혼합특성

  • 김태경 (부산대학교 기계공학부 대학원) ;
  • 성연모 (부산대학교 기계공학부 대학원) ;
  • 한승한 ((주)현대비엔지스틸) ;
  • 하상준 ((주)동신) ;
  • 최경민 (부산대학교 기계공학부) ;
  • 김덕줄 (부산대학교 기계공학부 기계기술연구원)
  • Received : 2012.07.25
  • Accepted : 2012.09.20
  • Published : 2012.09.30
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Abstract

To improve the flow and mixing characteristics of marine SCR system, two different mixer including up-down and swirl type mixer were considered. The purpose of this study is to analyse turbulence intensity and uniformity index in detail and to improve the performance of SCR with respect to the mixer structure. The results showed that, the concentration uniformity index is improved by about 5% with the utilization of both mixers in the front of catalyst part. Although the RMS value and relative turbulence intensity increased after the up-down type mixer, it could observed that the value of two parameters decreased with the flow proceeding forward to the downstream. For the case of swirl type mixer, the decrease of RMS value and relative turbulence intensity were relatively smaller than that of up-down type mixer, and uniform distribution of relative turbulence intensity was observed. As a results, it could be concluded that the mixing effects and the distance of the two kinds of mixer were different.

선박용 SCR 시스템에서 유동 및 혼합특성을 개선하기 위해 상하유도 및 스월 형상의 혼합기가 고려되었다. 본 연구의 목적은 혼합기 구조에 따른 난류강도 및 균일지수(Uniformity Index)를 상세히 분석하여 SCR 성능을 개선하는 것이다. 그 결과, 촉매부 전단에서의 농도균일도는 혼합기를 사용하였을 경우 약 5% 개선됨을 알 수 있었다. 상하유도형 혼합기의 사용에 따라 주위에서 높은 RMS 수치 및 상대난류강도를 보이지만, 하류로 진행하면서 두 값은 감소하는 경향을 보였다. 스월형 혼합기의 경우 유동의 진행에 대해 RMS 수치와 상대난류강도의 감소가 비교적 적고 상대난류강도의 경우 상대적으로 균일한 분포를 보였다. 두 혼합기에서 발생하는 유동특성에 의해 혼합효과 및 혼합거리가 달랐음을 알 수 있었다.

Keywords

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