Journal of ILASS-Korea (한국분무공학회지)

Institute for Liquid Atomization and Spray Systems-Korea (한국분무공학회)
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Emission Characteristics of Hazardous Air Pollutants from Diesel Heavy Duty Buses for Euro 5 according to After-treatment Systems

배출가스 저감장치에 따른 Euro 5 경유 대형버스의 유해대기오염물질 배출특성

  • 홍희경 (국립환경과학원 교통환경연구소) ;
  • 문선희 (국립환경과학원 교통환경연구소) ;
  • 정택호 (국립환경과학원 교통환경연구소) ;
  • 김선문 (국립환경과학원 교통환경연구소) ;
  • 서석준 (국립환경과학원 교통환경연구소) ;
  • 김정화 (국립환경과학원 교통환경연구소) ;
  • 정성운 (국립환경과학원 교통환경연구소) ;
  • 홍유덕 (국립환경과학원 교통환경연구소)
  • Received : 2018.10.02
  • Accepted : 2018.11.12
  • Published : 2018.12.30
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Abstract

Emission characteristics of regulated (NOx, PM, CO, NMHC) and unregulated (VOCs, aldehydes, PAHs) air pollutants were investigated for diesel heavy duty buses equipped with different after-treatment systems (DPF+EGR and SCR) under urban driving cycle. The combustion temperature and the working temperature of SCR catalysts were important to make impact on NOx emissions, whereas PM emissions were low. The alkane groups dominated NMVOCs emissions, making 42.6~59.4% of sum of the NMVOCs emissions. Especially, alkane emissions of DPF+EGR-equipped vehicle included DOC had 14.9~15.5% higher than those of SCR-equipped vehicle due to low efficiency of oxidation catalyst. In the case of individual NMVOCs, n-nonane and propylene emissions highly occupied for DPF+EGR and SCR, respectively. Formaldehyde emissions among aldehydes were the highest and PAHs emissions were hardly detected except naphthalene and phenanthrene. The NMHC speciation has been shown to be the highest of the formaldehyde ranged 20.8~21.5%. The results of this study will be contributed to establish Korean HAPs emission inventory for automobile source.

Keywords

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Fig. 1 Driving pattern of NIER-9 mode

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Fig. 2 Schematic diagram of exhaust emission test system

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Fig. 3 Overview of chassis dynamometer

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Fig. 4 Emission characteristics of (a) NOx, (b) PM, (c) CO and (d) NMHC according to after-treatment system for cold and hot start conditions

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Fig. 5 NMVOCs composition according to vehicle type for cold and hot start conditions

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Fig. 6 Emission characteristics of aldehydes according to vehicle type for (a) cold and (b) hot start conditions

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Fig. 7 Emission characteristics of PAHs according to vehicle type for (a) cold and (b) hot start conditions

Table 1 Specification of test vehicles

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Table 2 Specification of driving cycle

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Table 3 Specification of chassis dynamometer

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Table 3 Analysis conditions of TD and GC/MS

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Table 4 Analysis conditions of UPLC

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Table 5 Analysis conditions of GC/MS

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Table 6 Comparison of the five major chemical components in NMVOCs emissions from the diesel heavy duty buses for (a) cold and (b) hot start conditions

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Table 7 Comparison of the ten major chemical components in NMHC emissions from the diesel heavy duty buses with (a) cold and (b) hot start conditions

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