승용 디젤차량에서 Urea-SCR 시스템의 NOx 저감 특성에 관한 실험적 연구

다국어 초록 (Multilingual Abstract)

LNT(Lean NOx Trap), LNC(Lean NOx Catalyst), SCR(Selective Catalytic Reduction)과 같은 NOx 저감기술은 상용차뿐만이 아닌 승용차량 성능향상을 위해 지속적으로 개발이 진행되고 있다. 특히 Urea-SCR 시스템은 연료손실 없이 이론상 100%에 가깝게 NOx를 저감하는 가장 효과적인 기술로 환원반응으로 배기가스를 N₂와 H₂O로 배출하기 위해 환원제인 요소수를 분사해야한다. 하지만 엔진에서와는 달리 실제차량에서의 적용은 SCR 효율이 떨어지게 된다. 따라서 실제차량에서의 SCR 효율을 극대화하는 기술개발이 요구되고 있는 실정이다. 본 연구에서는, Post EURO-6 배기가스 규제에 대응하기 위한 디젤승용차량에서의 Urea-SCR의 NOx 저감 성능에 의한 저감효율의 극대화를 목적으로 실차용 Urea-SCR 시스템위한 기초자료로 제시하고자 한다.

다국어 초록 (Multilingual Abstract)

NOx reducing technique such as LNT, LNC , and selective catalytic reduction (SCR) have been developed and applied, especially on heavy-duty vehicles. However, it is expected that NOx reduction techniques will also be applied to diesel passenger vehicles. The urea-SCR system is receiving attention as the most effective NOx reduction technology without a fuel penalty. Thus, many advanced countries are developing this technology. The urea-SCR system sprays an aqueous urea solution that separates NOx into N₂ and H₂O, which are harmless and emitted into the atmosphere. The urea injected in front of the SCR catalyst should be changed to 100％ NH₃, which is required for NOx reduction in the SCR system to maximize the reduction efficiency. The purpose of this study was to determine the basic data for the urea-SCR system to maximize the NOx reduction efficiency by understanding the NOX reduction characteristics in a real passenger vehicle to comply with the post EURO-6 emission regulation.

목차 (Table of Contents)

• 초록
• Abstract
• 1. 서론
• 2. SCR에서의 NOx 환원반응
• 3. 실험장치 및 방법
• 4. 실험결과 및 고찰
• 5. 결론
• 참고문헌 (References)

참고문헌 (Reference)

1 홍길화, "승용디젤엔진의 운전 조건 및 분사 조건 변경에 따른 Urea-SCR 시스템의 NOx 전환효율에 관한 연구" 대한기계학회 33 (33): 952-960, 2009

2 Park, S., "Worldwide RDE - NOX Investigation Status on Diesel Passenger Vehicles and Its Implication" 2016

3 Han Y.-C., "New edition of Internal Combustion Engine"

4 "Emission Test Cycles: ECE 15 + EUDC / NEDC"

5 Baek, Y, "An Experimental Study on Characteristics of NOX reduction and NH3 slip with Urea-SCR System in Passenger Diesel Engine" 303-308, 2015

6 Baek, Y, "An Experimental Study on Characteristics of NOX Reduction and NH3 Slip with Urea-SCR System in Passenger Diesel Engine" 303-308, 2015

7 KO, S, "A Study on the NOX Reduction Rate and Fluid Mixing Characteristics Depending on the Mixer Configurations in Urea-SCR System" 615-620, 2011

8 Nishiyama, H, "A Study on the Improvement of NOX Reduction Efficiency for a Urea SCR System" 2015

9 Seo, J, "A Study on Effect of NOX and NH3 Emission Characteristics by Urea-SCR Model for Euro-6Emission Regulation in Diesel Engine" 479-485, 2012

10 Song, M, "A Numerical Study on the NOX Reduction Rate Depending on the Flow Uniformity Index of NH3 in front of the Catalytic Converter" 2013

11 Lim, J. -H, "A Numerical Analysis on Distribution of Reluctant with Mixer Application and Various Injection Method in Urea-SCR System" 419-424, 2010