대형경유자동차의 NO2/NOX 비율과 NOX 배출특성에 관한 연구 = A Study on NO2/NOX Ratio and NOX Emission Characteristics of Heavy-Duty Diesel Vehicles

다국어 초록 (Multilingual Abstract)

NOx emitted from heavy-duty diesel vehicles has a high percentage of domestic emissions in Korea. It is known that the NO2 emission was polluted the atmospheric environments and was harmful to humans. Therefore, investigation on NO2//NOx Ratio and NOx Emission Characteristics of Heavy-Duty Diesel Vehicles were carried out. In this study, NOx emissions from heavy-duty trucks and buses were measured by chassis dynamometer for heavy-duty vehicle in real time. Also, NO2/NOx ratio and NOx emission characteristics were analyzed by emission analyzer according to various conditions. It is revealed that NO and NO2 concentrations were increased in the acceleration section from results of NOx concentration in real time. The NOx emissions of heavy-duty trucks in test mode was confirmed a high level in order the average speed, but NOx emissions of heavy-duty buses were increased as the average speed increased. The NO2/NOx ratio of heavy duty trucks and buses was 0.7~1.0% and 7.7~7.8% at hot start engine condition. The results of this study will contribute to be used as basic data for the estimation of NO2 concentration in the roadside air monitoring network.

국문 초록 (Abstract)

대형경유자동차에서 배출되는 NOX는 국내 NOX 배출량 중 높은 비율을 차지하고 있으며, NO2는 인체에 유해하며 대기환경을 오염시키는 물질로 알려져 있다. 본 연구에서는 대형경유트럭과 대형경유버스에서 배출되는 NOX를 실시간으로 측정하였으며, 다양한 조건에 따른 NO2/NOX 비율과 NOX 배출특성을 파악하였다. 실시간으로 NOX의 농도를 측정한 결과 NO 와 NO2의 농도는 높은 출력을 요구하는 가속구간에서 증가하는 것으로 나타났다. 시험모드별 대형트럭의 NOX 배출량은WHVC>NIER 9>UDDS 순으로 낮은 평균속도에서 높게 배출되었다. 반면, 대형버스의 NOX 배출량은 평균속도가 증가할수록높게 배출되는 것을 확인하였다. 엔진 상태에 따른 대형트럭과 버스의 NOX 배출량은 엔진 미가열조건에서 23%, 78% 높게배출되었다. 대형트럭과 대형버스의 NO2/NOX 비율은 엔진 가열조건에서 각각 0.7~1.0%, 7.7~7.8%로 확인되었다. 본 연구의결과는 도로변대기측정망의 NO2 농도 산정을 위한 기초자료로 활용될 것으로 기대한다.

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