Browse > Article

NUMERICAL STUDY ON THE MIXER TYPES OF UREA-SCR SYSTEM FOR FLOW MIXING IMPROVEMENT  

Lee, J.W. (창원대학교 대학원 기계설계공학과)
Choi, H.K. (창원대학교 기계설계공학과)
Yoo, G.J. (창원대학교 기계설계공학과)
Publication Information
Journal of computational fluids engineering / v.15, no.4, 2010 , pp. 9-16 More about this Journal
Abstract
To alleviate NOx emission, a variety of approaches has been applied. In marine diesels, the application of SCR systems has been considered an effective exhaust aftertreatment method for NOx emission control. Most current SCR systems use a various catalyst for the reaction of ammonia with NOx to form nitrogen and water. In theory, it is possible to achieve 100% NOx if the $NH_3$-to-NOx ratio is 1:1. However, the reaction has a limited non-uniformity of the exhaust gas flow and ammonia concentration distribution. Therefore, it is necessary to investigate the optimum flow conditions. In order to achieve uniform flow at monolith front face, we are equipped with a various mixed devices. In this paper, it is presented that the mixed devices play an important role improvement of flow patterns and particle distributions of $NH_3$ by numerical simulation.
Keywords
Selective Catalytic Reduction; Urea; Mixer; Concentration Uniformity; CFD;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
연도 인용수 순위
1 2004, Kim, J.Y., Ryu, S.H. and Ha, J.S., "Numerical prediction on the characteristics of spray-induced mixing and thermal decomposition of urea solution in SCR system," 2004 Fall Technical Conference of the ASME Internal Combustion Engine Division, Long Beach, California USA.
2 1998, Heibel, A. and Spaid, M.A., "A New Converter Concept Providing Improved Flow Distribution and Space Utilization," SAE, pp.57-66.
3 1995, Zhao, F.Q. and Lai, M.C., "An Experimental Study of the Flow Structure insid Catalytic Converter of a Gasoline Engine," SAE, 950784.
4 1993, Weltens, H., Bressler, H., Terres, F., Neumaier, H. and Rammoser, D., "Optimisation of Catalytic Converter Gas Flow Distribution by CFD Prediction," SAE, 930780.
5 2008, 정석운, 임준형, 김상만, 김혜삼, 김경훈, "배기저감 장치의 촉매선단 입구 길이 변화에 따른 성능특성," 한국자동차공학회 30주년 기념 학술대회 논문집, pp.963-967.
6 2008, 서진원, 이규의, 오정택, 최윤호, 이종화, 박진일,"SCR 시스템의 믹서 구조 특성에 따른 유동 혼합 특성에 관한 연구," Transactions of KSAE, Vol.16, No.6,pp.192-199.
7 2004, 정수진, 이상진, 김우승, "대형 디젤엔진용 Urea-SCR 시스템의 NH3 슬립 억제를 위한 최적 인젝터의 형상 및 위치에 관한 수치적 연구," 한국자동차학회 추계학술대회논문집, pp.229-235.
8 2005, Jeong, S.J, Lee, S.J., Kim, W.S. and Lee, C., "Simulation on the Optimum Shap and Location of Urea Injector for Urea-SCR system of Heavy-Duty Diesel Engine to Prevent $NH_{3}$ Slip," SAE 2005-01-3886.
9 2008, 정수진, 이천환, "대형 디젤 엔진용 요소분사 SCR 촉매의 deNOx 성능향상을 위한 요소수용액의 분사특성연구," Transactions of KSAE, Vol.16, No.4, pp.165-172.
10 2008, Zhang, X. and Romzek, M., "Computational Fluid Dynamics (CFD) Applications in Vehicle Exhaust System," SAE 2008-01-0612.
11 2003, 최재성, 조권희, 이재현, 이진욱, 김진곤, "선박디젤기관용 SCR 시스템의 NOx 저감율에 관한 연구," 한국박용기관학회지, 제27권, 6호, pp.832-838.   과학기술학회마을
12 2008, Hong, K.H. et al, "Effext of Oxygen Concentration and Catalyst Temperature using Simulated Diesel Exhaust Gases on DeNOx Performance in Urea-SCR System," KSAE, Vol.1, pp.354-359.
13 2003, Winkler, C., Florchinger, P., Patil, M.D., Gieshoff, Spurk, J.P. and Pfeifer, M., "Modeling of SCR DeNOx Catalyst - Looking at the Impact of Substrate Attributes," SAE 2003-01-0845.
14 2007, ANSYS Inc, CFX-Solver 11.0.
15 1991, Driver, D.M., "Reynolds shear stress measurements in a separated boundary layer flow," AIAA, 1984-0175.
16 1994, 최희탁, 목재균, 이은호, 유재석, 이종화, "모노리스촉매 담체내의 유체 유동에 관한 연구," 한국 에너지 공학회지, pp.288-296.
17 1991, Wendland, D.W., Sorrell, P.L. and Kreucher, J.E., "Sources of Monolith Catalytic Converter Pressure Loss," SAE, 912372.