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A study on Property of Emission Gas by the Content Variation of Urea

UREA의 함량 변화에 따른 배출가스 특성분석

  • Kang, Hyungkyu (Korea Petroleum Quality & Distribution Authority) ;
  • Doe, Jinwoo (Korea Petroleum Quality & Distribution Authority) ;
  • Hwang, Inha (Korea Petroleum Quality & Distribution Authority) ;
  • Im, Jaeheuk (Korea Petroleum Quality & Distribution Authority) ;
  • Ha, Jonghan (Korea Petroleum Quality & Distribution Authority) ;
  • Na, Byungki (Department of Chemical Engineering, Chungbuk National University)
  • Received : 2015.09.03
  • Accepted : 2015.12.15
  • Published : 2015.12.31

Abstract

National and international regulations on the exhaust gases of diesel engines are being strengthened, and a study of the combutsion engine and the post-porcessing system are in progress as a variety of ways. There are many techniques for the removal of nitrogen oxide like HC-SCR, LNT, Urea-SCR. And the technical development on the Urea-SCR owing to high conversion efficiency and fuel economy characteristics has being processed. This study investigated the physical/chemical properties of urea according to the change of the urea content, and were analysed the characteristic of exhaust gas. According to the increase of urea content, the contests of biuret aldehyde, phosphate content was increased and the changes of emission quantity of carbon monoxide, hydrocarbons and particulate matter in the exhaust gas was very slight. The emission quantity of NOx was decreased in accordance with increasing the urea content and it was shown to be more than 80 % in the urea solution having more than 30 wt%.

국내외적으로 디젤엔진에 대한 배출가스 규제가 강화되고 있고 다양한 방식의 엔진연소 및 후처리 시스템에 대한 연구가 진행되고 있다. 질소산화물(NOx)의 제거방법으로는 HC-SCR, LNT, Urea-SCR 등이 있으며, Urea-SCR은 높은 변환 효율 및 연비특성으로 향후 NOx의 저감을 위한 유력한 기술로 많은 기술개발이 진행되고 있다. 본 연구에서는 요소함량의 변화에 따른 요소수의 물리적/화학적 특성을 조사하고 배출가스의 특성을 분석하였다. 요소함량의 증가에 따른 요소수의 뷰렛, 알데히드, 인산염 함량은 증가하였으며, 배출가스 중 일산화탄소(CO), 탄화수소(HC) 및 입자상물질(PM)의 배출량 변화는 미미하였다. 질소산화물(NOx)의 배출량은 요소함량이 증가함에 따라 감소하였으며, 30.0 wt%이상의 요소수에서는 질소산화물의 저감효율이 80 %이상을 나타내었다.

Keywords

References

  1. T. Johnson, "Diesel Emission Control In Review," SAE 2006-01-0030, 2006
  2. Lee, C., Cho, T., "An Experimental Study of Nano PM Emission Characteristics of Commercial Diesel Engine with Urea-SCR System to Meet EURO-IV", Transaction of the Korean Society of Automotive Engineers, Vol. 15, No. 6, pp. 128-136, 2007
  3. Seo, J., Lee, S., Cho, Y., Kang, Y., "A study on Effect of NOx and NH3 Emission Characteristics by Urea-SCR Model for Euro-6 Emission Regulation in Diesel Engine", The Korean Society Of Automotive Enineers, pp. 479-485, 2012
  4. Han, J., Hong, K., Hwang, I., Myung, C., Park, S., Lee, N., "NO/NO2 mixture ratio and Catalyst Temperature using Simulated Diesel Exhaust Gases on DeNOx Performance in Urea-SCR System", The Korean Society of Mechanical Engineers, pp. 67-72, 2008
  5. Fang, H. L., Dacosta, H. F. M., "Urea Thermolysis NOx Reduction with and without SCR Catalysts," Applied Catalysis B: Environmental, Vol. 46, pp. 17-34, 2003 https://doi.org/10.1016/S0926-3373(03)00177-2
  6. Qiu, Y., Gao, L., "Blue-Emitting Syanuric Acid-Melamine Complexes from Urea Thermolysis," Materials Research Bulletin, Vol. 40, pp. 794-799, 2005 https://doi.org/10.1016/j.materresbull.2005.02.003
  7. Sluder, C. S., Storey, J. M. E., Lewis, S. A., Lewis, L. A., "Low Temperature Urea Decomposition and SCR Performance," SAE 2005-01-1858, 2005
  8. Majewski, W. A., "Selective Catalytic Reduction," www.diselnet.com, 2005
  9. Clean Air Conservation Act, Ministry of Environment, 2015.