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대형 디젤 엔진용 요소분사 SCR촉매의 deNOx 성능향상을 위한 요소수용액의 분사특성 연구

A Study on the Injection Characteristics of Urea Solution to Improve deNOx Performance of Urea-SCR Catalyst in a Heavy Duty Diesel Engine


Urea-SCR, the selective catalytic reduction using urea as reducing agent, has been investigated for about 10 years in detail and today is a well established technique for deNOx of stationary diesel engines. In the case of the SCR-catalyst a non-uniform velocity and $NH_3$ profile will cause an inhomogeneous conversion of the reducing agent $NH_3$, resulting in a local breakthrough of $NH_3$ or increasing NOx emissions. Therefore, this work investigates the effect of flow and $NH_3$ non-uniformities on the deNOx performance and $NH_3$ slip in a Urea-SCR exhaust system. From the results of this study, it is found that flow and $NH_3$ distribution within SCR monolith is strongly related with deNOx performance of SCR catalyst. It is also found that multi-hole injector shows better $NH_3$ uniformity at the face of SCR monolith face than one hole injector.

참고문헌 (14)

  1. M. D. Patil, P. Spurk, P. Floerchinger, J. Gieshoff, M. Pfeifer and C. Winkler, "Modeling of SCR deNOx Catalyst -Looking at the Impact of Substrate Attributes," SAE 2003-01-0845, 2003 
  2. M. Ueda, A. Asano, T. Kondo, Y. Watanabe, T. Fukuma and Y. Harada, "A New Optimizing Technique of a Diesel Engine Aftertreatment System using HC deNOx Catalyst," JSAE Review, Vol.24, pp.47-51, 2003 
  3. M. Koebel, M. Elsener and M. Kleemann, "Urea-SCR: a promising technique to reduce NOx emissions from automotive diesel engines," Catalyst Today, Vol.59, pp.335-345, 2000 
  4. Y. Qiu and L. Gao, "Blue-emitting Syanuric Acid-melamine Complexes from Urea Thermolysis," Materials Research Bulletin, Vol.40, pp.794-799, 2005 
  5. J. C. Wurzenberger and R. Wanker, "Multi- Scale SCR Modeling, 1D Kinetic Analysis and 3D System Simulation," SAE 2005-01-0948, 2005 
  6. H. L. Fang and H. F. M. DaCosta, "Urea thermolysis NOx reduction with and without SCR catalysts," Applied Catalysis B: Environmental, Vol.46, pp.17-34, 2003 
  7. R. Shinozaki, Y. Takeda, H. Jyoutaki, S. Saito and A. Suzuki, "Development of Urea-SCR System for Commercial Vehicle-Basic Characteristics and Improvement of NOx Conversion at Low Load Operation," SAE 2003-01-3248, 2003 
  8. STAR-CD Ver.3.24 Manual, Computational Fluid Dynamics Ltd., 2005 
  9. S.-J. Jeong, S.-J. Lee, W.-S. Kim and C. Lee, "Simulation on the Optimum Shape and Location of Urea Injector for Urea-SCR System of Heavy-Duty Diesel Engine to Prevent $NH_3$ Slip," SAE 2005-01-3886, 2005 
  10. H. Weltens, H. Bressler, F. Terres, H. Neumaier and D. Rammoser, "Optimisation of Catalytic Converter Gas Flow Distribution by CFD Prediction," SAE 930708, 1993 
  11. J. Oh, J. Seo, K. Lee, J. Park, Y. Choi and J. Lee, "Visualization of Urea Mixing Characteristics by Mixer and Diffuser in SCR System," Spring Conference Proceedings, KSAE, pp.326-332, 2007 
  12. M. A. Cremer, E. Eddings, T. Martz, L. J. Muzio, Q. Quartucy, R. Hardman, J. Cox and J. Stallings, "Assessment of SNCR Performance on Large Cole-fired Utility Boilers," 1998 DOE Conference on SCR and SNCR for NOx Control, Pittsburg, PA, 1998 
  13. S.-J. Jeong, S.-J. Lee, W.-S. Kim and C. Lee, "Numerical Study on the Injector Shape and Location of Urea-SCR System of Heavy-duty Diesel Engine for Preventing $NH_3$ Slip," Transactions of KSAE, Vol.14, No.1, pp.68-78, 2006 
  14. X. Zhang, M. Romzek and C. Morgan, "3-D Numerical Study of Mixing Characteristics of NH3 in front of SCR," SAE 2006-01-3444, 2006 

이 논문을 인용한 문헌 (6)

  1. Lee, J.W. ; Choi, H.K. ; Yoo, G.J. 2010. "NUMERICAL STUDY ON THE MIXER TYPES OF UREA-SCR SYSTEM FOR FLOW MIXING IMPROVEMENT" 한국전산유체공학회지 = Journal of computational fluids engineering, 15(4): 9~16 
  2. Ko, S.C. ; Lee, B.H. ; Cho, S.H. ; Lee, S.H. ; Hong, S.T. ; Lee, D.Y. 2010. "A STUDY ON FLOW MIXING IMPROVEMENT OF SELECTIVE CATALYTIC REDUCTION USING GASEOUS REDUCTANT" 한국전산유체공학회지 = Journal of computational fluids engineering, 15(1): 56~63 
  3. Park, Seon-Mi ; Chang, Hyuk-Sang ; Zhao, Tong 2011. "Numerical Study on the Arrangement of AIG for Determining the $NH_3$ Concentration Distribution in the Package Type of Small Scale SCR System" 대한환경공학회지 = Journal of Korean Society of Environmental Engineers, 33(5): 368~377 
  4. Lee, Banguk ; Lee, Jeekeun 2013. "Numerical Investigation on Wall Flow Control for Preventing Contaminants Deposition inside a Duct" 설비공학논문집 = Korean journal of air-conditioning and refrigeration engineering, 25(5): 261~268 
  5. Lee, Seung Yeop ; Kim, Nam Il ; Park, Yun Beom ; Kim, Man Young 2013. "Numerical Investigation of Urea Freezing and Melting Characteristics Using Coolant Heater" 大韓機械學會論文集. Transactions of the Korean Society of Mechanical Engineers. B. B, 37(8): 717~724 
  6. Moon, Seongjoon ; Jo, Nakwon ; Oh, Sedoo ; Jeong, Soojin ; Park, Kyoungwoo 2014. "A Numerical Study on the Optimization of Urea Solution Injection to Maximize Conversion Efficiency of NH3" 한국자동차공학회논문집 = Transactions of the Korean Society of Automotive Engineers, 22(3): 171~178 


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