디젤엔진의 운전조건 변화 및 Urea-SCR 시스템 제어에 따른 DeNOx 성능에 대한 실험적 연구

다국어 초록 (Multilingual Abstract)

Recently, as the current and future emission regulations go stringent, the research of NOx reduction has become a subject of increasing interest and attention in diesel engine. Selective Catalytic Reduction (SCR) is one of the effective technology to reduce NOx emission from diesel engine. Especially, Urea-SCR that uses urea as a reductant is becoming increasingly popular as a cost effective way of reducing NOx emissions from heavy duty vehicles. In this research, we designed urea injector and DCU (Dosing Control Unit) specially developed for controlling the Urea-SCR process onboard vehicles. As passenger and commercial diesel engine experiment, we grasped characteristics of NOx emission and SCR catalyst temperature level in advance. As a result, highest NOx emission level was shown in condition of low engine speed and high load. On the other hand, SCR catalyst temperature was highest at high engine speed and load. On the basis of these result, we conducted the NOx reduction test at steady engine operating conditions using the urea injector and DCU. It was shown that 74% NOx conversion efficiency on the average and 97% NOx conversion efficiency was obtained at high SCR catalyst temperature.

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 김영득, "디젤엔진의 NOx 저감을 위한 SCR DeNOx 촉매의 모델링 및 성능해석" 한국자동차공학회 17 (17): 137-145, 2009

3 J. Schommers, "World Wide Emission Strategy with BLUETEC for Diesel Passenger Cars"

4 M. Koebel, "Recent Advances in the Development Urea-SCR for Automotive Applications"

5 C. Winkler, "Modeling of SCR DeNOx Catalyst-Looking at the Impact of Substrate Attributes"

6 J. B. Heywood, "Internal Combustion Engine Fundamentals" McGraw Hill 1988

7 K. Hong, "Experimental and Numerical Investigation on the Urea SCR Dosing System to Improve NOx Reduction Efficiency" 731-736, 2008

8 J. W. Han, "Experimental Investigation on the Urea SCR System to Improve NOx Conversion with Simulated Diesel Exhaust Gases" 6-29, 2008

9 명차리, "EFFECTS OF GASOLINE, DIESEL, LPG, AND LOW-CARBON FUELS AND VARIOUS CERTIFICATION MODES ON NANOPARTICLE EMISSION CHARACTERISTICS IN LIGHT-DUTY VEHICLES" 한국자동차공학회 10 (10): 537-544, 2009

10 C. M. Schär, "Control of a Urea SCR Catalytic Converter System for a Mobile Heavy Duty Diesel Engine"

11 A. Nishioka, "A Urea-Dosing Device for Enhancing Low-Temperature Performance by Active-Ammonia Production in an SCR System"

12 W. S. Lee, "A Study on NOx Reduction of a Selective Catalytic Reduction(SCR)System in a Heavy-Duty Diesel Engine" 412-417, 2006