한국자동차공학회논문집 (Transactions of the Korean Society of Automotive Engineers)

  • 제15권6호
  • /
  • Pages.128-136
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  • 2007
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  • 1225-6382(pISSN)
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  • 2234-0149(eISSN)
한국자동차공학회 (The Korean Society of Automotive Engineers)
권호 표지

상용디젤엔진의 EURO-IV 배기규제 대응을 위한 Urea-SCR 시스템의 나노입자 배출특성에 관한 실험적 연구

An Experimental Study of Nano PM Emission Characteristics of Commercial Diesel Engine with Urea-SCR System to Meet EURO-IV

  • 이천환 (자동차부품연구원 환경부품연구센터) ;
  • 조택동 (충남대학교 기계설계공학과)
  • 발행 : 2007.11.01
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초록

It is well known that two representative methods satisfy EURO-IV regulation from EURO-III. The first method is to achieve the regulation through the reduction of NOx in an engine by utilizing relatively high EGR rate and the elimination of subsequently increased PM by DPF. However, it results in the deterioration of fuel economy due to relatively high EGR rate. The second is to use the high combustion strategy to reduce PM emission by high oxidation rate and trap the high NOx emissions with DeNOx catalysts such as Urea-SCR. While it has good fuel economy relative to the first method mentioned above, its infrastructure is demanded. In this paper, the number distribution of nano PM has been evaluated by Electrical Low Pressure Impactor(ELPI) and CPC in case of Urea-SCR system in second method. From the results, the particle number was increased slightly in proportion to the amount of urea injection on Fine Particle Region, whether AOC is used or not. Especially, in case of different urea injection pressure, the trends of increasing was distinguished from low and high injection pressure. As low injection pressure, the particle number was increased largely in accordance with the amount of injected urea solution on Fine Particle Region. But Nano Particle Region was not. The other side, in case of high pressure, increasing rate of particle number was larger than low pressure injection on Nano Particle Region. From the results, the reason of particle number increase due to urea injection is supposed that new products are composited from HCNO, sulfate, NH3 on urea decomposition process.

키워드

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