http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Availability of NH3 adsorption in vanadium-based SCR for reducing NOx emission and NH3 slip
고아현,우영민,장진영,정용진,표용덕,조현,임옥택,이영재 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.78 No.-
This study was carried out to analyze the amount of NH3 adsorption by selective catalytic reduction usingvarious methods for the development of an optimized urea injection control logic. The maximumadsorbable amount, available adsorption amount for NOx reduction, and maximum adsorption amountbefore NH3 slip were separately measured. The results of the three types of adsorption amounts showthat the optimum operating range for urea control gradually narrowed for high exhaust gastemperatures. Furthermore, it was found to be particularly challenging to completely remove NH3slip without ammonia oxidation catalyst in the transient operation of the engine.
고아현,우영민,장진영,정용진,표영덕,조현,임옥택,이영재 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.80 No.-
This study was conducted as part of the development process of the diesel oxidation catalyst, dieselparticulatefilter, and selective catalytic reduction systems of old diesel vehicles for particles and NOxreduction. While SCR plays the most important role in the reduction of NOx emissions, the contributionof the DOC and DPF cannot be ignored. The conversion, generation, and reduction of NO, NO2, and N2Oemissions through DOC, DPF, and SCR were tracked for use as basic data for the development of thecatalyst and control logic. The results of the experiment show that NO was converted to NO2 at over300 C by Pt catalytic oxidation reaction. The highest conversion rate appeared at 450 C for DOC and at350 C for DPF. NO2 was converted to NO in the operating range of 150–300 C by de-oxidation reaction. Under most operating conditions, NOx reduction efficiency in SCR was maximized when the NH3 to NOxratio was 1, but the reduction efficiency was deteriorated by excessive NO2 conversion in DOC and DPF. InSCR, NO2 decomposition without NH3 could convert NO2 to NO, showing improved NO2 reductionefficiency under some operating conditions, where NO2 was excessively converted in DOC and DPF.
에탄올 함량비에 따른 가솔린 직접분사 차량의 나노입자 배출특성과 운전특성에 관한 연구
고아현(Ahyun Ko),김주원(Juwon Kim),명차리(Cha-Lee Myung),박장민(Jang-Min Park),김선문(Sunmoon Kim),박심수(Simsoo Park) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
This study focused on the particle emission characteristics of gasoline direct injection vehicle fueled with gasoline-ethanol blends. The test vehicle was operated on the CVS-75 mode and particle emissions were extracted through the GPMS the CVS tunnel consisted of solid particles like carbonaceous fraction, metal ash, etc. The test fuel were consisted of ethanol 0%, 10%, 30% and ethanol 50%. The test results showed that the particle number was decreased by increase of ethanol contents. The reduction efficiencies of particle emissions were from 10 % to 85 %. Also, the particle number of test vehicle could met the future regulation, Euro 6, when fueled with ethanol 30 %.
가솔린과 바이오 에탄올 혼합 연료의 엔진 및 차량 모드 주행시의 입자상 물질 배출 특성
고아현(Ahyun Ko),이형민(Hyungmin Lee),최관희(Kwanhee Choi),박심수(Simsoo Park),이영재(Young Jae Lee) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
This paper was focused on the particulate matter (PM) on the gasoline and bio ethanol. Bio ethanol as a clean fuel is considered one of the alternative fuels that decreased the PM emission from the vehicle. Particle formation in SI engine was depended on the fuel and engine operating condition. In this paper, Particle number concentration behaviors were analyzed by DMS500 (Differential Mobility Spectrometer) and CPC (Condensation Particle Counter) instrument which was recommended by PMP (Particle Measurement Programme). Particle emissions were measured with various engine operating variables such as air excess ratio (λ), spark timing and intake valve opening (IVO) at part load condition. In vehicle test, the number of particulate matter was analyzed with golden particle measurement system, which was consist of CVS (Constant Volume Sampler), particle number counter and particle number diluter.
승용 디젤 엔진의 후처리 시스템 적용에 따른 나노입자 배출 맵 구축 및 저감특성에 관한 연구
고아현(Ahyun Ko),황인구(In Goo Hwang),명차리(Cha-Lee Myung),박심수(Simsoo Park),최회명(Hoimyung Choi) 대한기계학회 2010 大韓機械學會論文集B Vol.34 No.8
본 연구는 승용 디젤엔진의 입자상 물질 배출특성에 관한 것으로써, 엔진에서 배출된 입자상 물질이 배기관 및 후처리장치인 디젤산화촉매와 매연여과장치를 통과할 때의 특성 변화를 파악하기 위하여 후처리장치 각각 전 후단 및 배기관에서 직접 측정하였다. 또한 다양한 엔진회전속도 및 부하조건에서 측정함으로써 입자상 물질 배출 맵을 구축하였으며, 디젤산화촉매 및 매연여과장치의 입자상 물질 저감효과에 대해 평가하였다. 뿐만 아니라 배기재순환율과 연료분사시기를 변경시켜 입자상 물질의 배출특성 변화를 파악하였다. 모든 시험에서 입자상 물질을 5~1000nm 크기까지 측정할 수 있는 DMS500을 이용하였다. In this study, we mainly focused on the PM (Particulate Matter) emission characteristics of a diesel engine. To analyze particle behavior in the tail-pipe, particle emission was measured on the engine-out (downstream of turbocharger), each upstream and downstream both of DOC (Diesel Oxidation Catalyst) and DPF (Diesel Particulate Filter). Moreover, particle emission contours on each sampling point were constructed. The reduction efficiency of particle number concentration and mass through the DOC and DPF was studied. Parameters such as EGR (Exhaust Gas Recirculation) and the main injection timing were varied in part load conditions and evaluated using the engine-out emissions. The DMS500 (Differential Mobility Spectrometer) was used as a particle measurement instrument that can measure particle concentrations from 5 nm to 1000 nm. Nano-particles of sizes less than 30 nm were reduced by oxidation or coagulated with solid particles in the tail-pipe and DOC. The DPF has a very high filtration efficiency over all operating conditions except during natural regeneration of DPF.