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국내 EGR과 SCR 장착 중형트럭 대기오염물질 배출 특성
손지환 ( Jihwan Son ),김정화 ( Jounghwa Kim ),정성운 ( Sungwoon Jung ),유흥민 ( Heungmin Yoo ),홍희경 ( Heekyung Hong ),문선희 ( Sunhee Mun ),최광호 ( Kwangho Choi ),이종태 ( Jongtae Lee ),김정수 ( Jeongsoo Kim ) 한국액체미립화학회 2016 한국액체미립화학회지 Vol.21 No.3
NOx and PM are important air pollutants as vehicle management policy aspect. Medium-duty truck is the main source of the pollutants although the vehicle market share is only 3.5%. National emission portion of NOx and PM form the mobile sourece are 14% and 16% respectively. In this study it was investigated that characteristics of air pollutants emission on medium duty truck equipped with EGR and SCR system. Vehicle’s test reflected driving cycle on the chassis dynamometer, and applied test cycle was WHVC(World Harmonized Vehicle Cycle) mode. The test cycle include three segments, represent urban, rural and motorway driving. Based on the test results NOx, PM, HC were less emitted form SCR vehicle than EGR vehicle. And CO was less emitted form EGR vehicle than SCR vehicle due to CO oxidation reaction on DPF surface. And most air pollutants reduced as average vehicle speed increased. Pollutants were less emitted on motorway section than urban and rural sections. But highly NOx emission on motorway section was verified according to increased EGR ratio on fast vehicle speed. HC and CO additional emission was identified as 68%, 58% respectively during SCR vehicle`s cold engine start emission test. NOx additional emission was detected by 24% on SCR vehicle`s condition of engine cold start while not detected on vehicle equipped with EGR. SCR vehicle`s additional NOx emission was derived from low reaction temperature during engine cold start condition. medium-duty truck emission characteristics were investigated in this study and expected to used to improve air pollutants management policy of medium-duty truck equipped with SCR & EGR.
대형 경유트럭의 NO<sub>x</sub> 저감장치에 따른 배출가스 특성비교
문선희,유흥민,손지환,윤창완,박규태,김정수,이종태,Mun, SunHee,Yoo, Heung-Min,Son, JiHwan,Yun, Changwan,Park, Gyu Tae,Kim, JeongSoo,Lee, Jongtae 한국액체미립화학회 2015 한국액체미립화학회지 Vol.20 No.3
With increasing of GDP, the registration number of passenger cars has exceeded 20 million last year in Korea. Especially, the registration number of the diesel engine vehicles has been increasing. However, the WHO(World Health Organization) IARC (International Agency for Research on Cancer) has reported that diesel engine exhaust gas is an one of HAPs, which has carcinogenic for human, and they have designated it to Group 1. To solve this problem, exhaust gas from diesel engines has to be controlled. Thus, it has been controlling by European regulatory standard in Korea. On the other hand, in order to meet the enhanced emission regulations, all manufacturing company applied $NO_x$ control device to vehicles such as EGR (Exhaust Gas Recirculation), SCR (Selective Catalytic Reduction) and so on. However, these devices (EGR, SCR) were operated by difference reaction mechanism respectively, and the composition of exhaust gas would be differenced from that of them. In this study, it was conducted to evaluate variety characteristics on changing of exhaust gas composition by each $NO_x$ control device, and the heavy duty diesel trucks were chosen as experimental vehicles. From the result, it revealed that vehicles (with EGR) were discharged higher THC as 52.5% than that of others (with SCR). However, it did not followed that trend, in the case of CO; it was discharged as 57.2% lower than that of others (with SCR). In the future, these data would be used to apply to efficient $NO_x$ control device for meeting to EURO 6.
포스터 전시회 : 연료첨가제 주입 전,후 승용차의 규제물질 배출현황
정성운 ( Sungwoon Jung ),손지환 ( Jihwan Son ),홍희경 ( Heekyoung Hong ),성기재 ( Kijae Sung ),김정수 ( Jeongsoo Kim ),김정화 ( Jounghwa Kim ) 한국액체미립화학회 2015 한국액체미립화학회 학술강연회 논문집 Vol.2015 No.-
This study was designed to investigate characterization of regulated pollutants (CO, HC, NOx and PM) emitted from 134 diesel and gasoline passenger cars based on emission standards according to fuel additives. The experiments using chassis dynamometer were conducted under NEDC and CVS-75 modes. Comparison for fuel additive management and test between Korea, USA, EU and Japan, Korea was more strict than others. For with/without fuel additives according to diesel emission standards, NOx of EURO 4 and EURO 5 showed a relatively similar tendency. In the case of PM reduction rate, EURO 5 was over 20% decreased than EURO 4. In the case of standard deviation/average ratio for gasoline vehicles, variation interval was big for LEV 23.3 ~ 58% and ULEV 31.6 ~ 56.4%. Following the imposition of stricter regulations (EURO 5 and ULEV), difference rate for standard deviation was big. Especially, in the case of diesel vehicles, difference rate for NOx 68% and PM 48% was the biggest. The results of present study will contribute to set up emission standards for Korean fuel additives.