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배출허용기준 및 주행모드에 따른 중형화물차의 대기오염물질 배출특성
정택호 ( Taek Ho Chung ),김선문 ( Sun Moon Kim ),이종철 ( Jong Chul Lee ),임윤성 ( Yun Sung Lim ),김인구 ( In Gu Kim ),이종태 ( Jong Tae Lee ),김형준 ( Hyung Jun Kim ) 한국액체미립화학회 2020 한국액체미립화학회지 Vol.25 No.1
NOx, PN and CO emissions from diesel trucks make up a significant portion of domestic air pollutant emissions. Therefore, test vehicles with various emission standards and driving modes were selected to evaluate the emission characteristics of regulated pollutants (NOx, PN, CO) in medium-duty trucks. As a result of test, all test vehicles were satisfied with Euro 5 or 6 regulation. NOx emissions of Euro 6 vehicles with after-treatment of LNT + DPF were lower than those of Euro 5 vehicles with DPF. In WLTC mode, all vehicles have high NOx emissions at section of extra high speeds, which are determined by increased fuel consumption and high combustion temperatures. CO and PN emissions from all vehicles were found to be low at section of low speeds. Also, The NO<sub>2</sub>/NOx ratio was analyzed at 7-23% in each mode, and the NO<sub>2</sub>/NOx ratio increased as the average vehicle speed increased. In NIER 9 mode, the CO, HC, and PN emissions were higher under cold conditions of engine than hot conditions of engine. In addition, vehicles with after-treatment system of LNT have similar NOx emissions level in this study.
대형경유자동차의 NO₂/NO<SUB>X</SUB> 비율과 NO<SUB>X</SUB> 배출특성에 관한 연구
정택호(Taek Ho Chung),김선문(Sun Moon Kim),문선희(Sun Hee Mun),홍희경(Hee Kyoung Hong),이승환(Seoung Hwan Lee),서석준(Seok Jun Seo),김정화(Joung Hwa Kim),정성운(Sung Woon Jung),김인구(In Gu Kim),이종철(Jong Chul Lee),이종태(Jong Tae 대한환경공학회 2019 대한환경공학회지 Vol.41 No.4
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 NO와 NO₂의 농도는 높은 출력을 요구하는 가속구간에서 증가하는 것으로 나타났다. 시험모드별 대형트럭의 NOX 배출량은 WHVC>NIER 9>UDDS 순으로 낮은 평균속도에서 높게 배출되었다. 반면, 대형버스의 NOx 배출량은 평균속도가 증가할수록 높게 배출되는 것을 확인하였다. 엔진 상태에 따른 대형트럭과 버스의 NOX 배출량은 엔진 미가열조건에서 23%, 78% 높게 배출되었다. 대형트럭과 대형버스의 NO₂/NOx 비율은 엔진 가열조건에서 각각 0.7~1.0%, 7.7~7.8%로 확인되었다. 본 연구의 결과는 도로변대기측정망의 NO₂ 농도 산정을 위한 기초자료로 활용될 것으로 기대한다. 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.
대기오염물질 배출원 추적 가능성 평가 연구 : 연소기관(외연기관/내연기관)에 따른 이산화탄소 동위원소비 특성비교
유흥민 ( Heung-min Yoo ),정택호 ( Taek Ho Chung ),이상엽 ( Sang-yeop Lee ),박세원 ( Se-won Park ),서용칠 ( Yong-chil Seo ) 한국폐기물자원순환학회 2019 한국폐기물자원순환학회지 Vol.36 No.7
There are many issues related with environment in the world. As time goes by, it would be main problems for present generations in the near future. Especially, the problems for air pollutant including particulate matter (PM) need to be resolved among locals or nations. In order to develop the renewable energy sources sustainably, the facility operators should prove the harmlessness for environments, such as atmosphere, water, and health risk. In Korea, the government is faced with these problems. Especially, local citizens have been demanding suspension of operating and using the fluffsolid refused fuel (SRF) in combined heat and power plants. According to this problem, the government has announced the 4th master plan for renewable energy in Korea, one of the main contents is to decrease supplement proportion of the ‘waste to energy’ part from approximately 68 % to 29 %. However, this master plan could cause ‘combustible waste congestion’ because the balance between supply and demand was not considered. Thus, the efficient method to resolve should be developed, while considering the balance. To solve these issues, many researchers have been suggesting and researching to establish a tracking technology on air pollutant sources. It may serve an appropriate solution to us in the near future, if it can identify the air pollutant sources among variable sources, such as combined heat and power plant, a lot of vehicles, and another sources. In this study, the carbon isotope was used to identify sources among SRF, gasoline, diesel and motorcycles with vehicles in order to establish the Korean database of exhausted gas from various engines. In the case of SRF, gasoline, and diesel, the outcome has been revealed as the average of carbon isotope -26.814‰, - 26.949‰, and -28.298‰ respectively. As a result, the carbon isotope of area located in the near plant might expect to be in the range from -26.814‰ to -25.446‰, and that in the urban might expect to be about -30‰.
임윤성 ( Yun Sung Lim ),문선희 ( Sun Hee Mun ),정택호 ( Taek Ho Chung ),이종태 ( Jong Tae Lee ),동종인 ( Jong In Dong ) 한국액체미립화학회 2020 한국액체미립화학회지 Vol.25 No.1
Automotive manufacturers are applying technologies for greenhouse gas reduction such as vehicle weight reduction, engine downsizing, direct injection technology, variable valves and transmission performance improvement to achieve the targets for enhanced greenhouse gas and fuel consumption efficiency. In this paper, compared and analyzed greenhouse emissions according to engine capacity, engine displacement, curb weight and sales volume of hybrid and internal combustion engine passenger vehicles. Hybrid emit 32~39% less greenhouse gas than internal combustion engines through the combined mode test method. Hybrid electric vehicle’s curb weight was about 7% heavier on average for the same engine displacement, while greenhouse gas was about 36% lower. It was confirmed that in order to reduce the emission of pollutants of greenhouse gases as well as the air pollutants, it is necessary to expand the supply of eco-friendly vehicles.