http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
오늘 본 자료
직접분사식 가솔린엔진 배출가스 중 비열플라즈마와 촉매시스템을 이용한 NOx 저감에 관한 실험적 연구
김대하(Daeha Kim),이형상(Hyeong-sang Lee),전광민(Kwang Min Chun) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
NOx reduction by a non-thermal plasma and catalyst system was tested with the exhaust gas of a single-cylinder gasoline direct injection engine operating at stratified charge condition Ag/Al₂O₃(2.5wt%) was used for NOx abatement in lean condition, and a conventional three-way catalyst were connected next to it NOx reduction efficiency of Ag/Al₂O₃ catalyst was about 45% when used alone at 1500rpm, bmep 4bar condition Non-thermal plasma was only slightly effective in its assistant role to increase the activity of the catalysts. Three-way catalyst reduced CO and THC efficiently, and about 10% more NOx reduction was achieved than Ag/Al₂O₃ only. NOx reduction efficiency was strongly affected by the temperature of the catalyst and reached to 70% when the Ag/Al₂O₃~ catalyst temperature was around 400˚c.<br/>
플라즈마/DPF 시스템을 이용한 soot 산화에 관한 기초 실험 연구
김동인(Donginn Kim),이형상(Hyeong Sang Lee),전광민(Kwang Min Chun) 한국자동차공학회 2002 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2002 No.5_3
In a plasma/DPF system, NO₂ oxidized from NO in a plasma reactor can oxidize the soot filtered by DPF. The pressure difference between the inlet and outlet of the DPF, and the concentrations of NO. N0₂, CO and CO₂, were measured at various temperatures as a function of time to find the characteristics of soot oxidation in the plasma/DPF system. Soot oxidization by NO₂ began at 250℃ and its rate increased at higher temperature. The NO₂ was reduced to NO in the process of soot oxidation and the soot was oxidized to CO and CO₂ proportionally. Plasma produces NO₂ by oxidation of NO in a gas containing NO, 0₂, HC, and the gas was more efficient than NO, containing gas without plasma treatment in DPF regeneration by 2 times at 300°C and 3 times at 350°. It is suggested that active species such as partially oxidized hydrocarbons and OH, HO₂ produced from plasma reaction also promotes soot oxidation as well as N0₂ in the soot oxidation process of DPF regeneration.
플라즈마/후가열 장치와 NOx 저감에 미치는 효과에 관한 연구
정상호(Sangho Jung),이형상(Hyeong-Sang Lee),박광서(Kwang-Seo Park),전광민(Kwang Min Chun) 한국자동차공학회 2002 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2002 No.5_1
The characteristics of DeNOx conversion process by plasma/post-heating system with the simulated gas containing propene is investigated experimentally. Without plasma treatment, NO-NO₂ conversion occurs at approximately 450°C in a mixture of N₂/O₂ with a trace gas of propene, and increases greatly as temperature increases. The NO can, however, be converted to NO₂at lower temperatures by treating the gas mixture with non-thermal plasma. The NO-NO₂ conversion enhances further by passing the plasma treated gas through the post-heating furnace. Results show that 18% - 39% more conversion of NO to NO₂ is observed when the temperatures of the post-heating furnace are maintained at 300°C or 400°C. The additional NO-NO₂ conversion by post-heating is due to the reaction of propene with the byproducts or radicals generated from the plasma reaction.
플라즈마와 촉매를 이용한 디젤엔진 배출가수중이 NOx 저감 및 플라즈마 시뮬레이션을 통한 플라즈마 반응의 부산물 예측
전광민(Kwang Min Chun),전배혁(Bae-Hyeock Chun),박광서(Kwang-Seo Park),이형상(Hyeong-Sang Lee),류재홍(Jae Hong Ryu) 한국자동차공학회 2001 한국자동차공학회 Workshop Vol.2001 No.-
NOx reduction by a plasma/catalyst system was tested with modeled gas and diesel exhaust gas. Ag/Al₂O₃was used as the catalyst. The oxidation of NO to N0₂by the plasma was increased as HC concentration and input energy density increased. The presence of H₂O in the reactant gas led to the production of acid by plasma. The catalytic activity for NOx reduction was enhanced by the assistance of plasma especially in the lower temperature region. The NOx conversion to N₂ was evaluated by a gas chromatography in the model gas with helium as the balance gas. The result in helium balance gas showed that the selectivity to N₂ depended on the catalyst temperature and was also enhanced by the assistance of plasma. The 50% of NOx removal from the diesel exhaust gas was achieved by the plasma/catalyst system. A kinetic simulation model was also developed to characterize the plasma chemistry in modeled gas. The model uses ELENDIF program to solve Boltzmann equation for electron energy distribution function, and CHEMKIN-II program to solve stiff ODE(ordinary differential equation) problems for species concentrations. The corona discharge energy per voltage pulse and the time-space averaged EIN were obtained by fitting the model to experimental data. The model calculation shows good agreement for NO and N0₂ concentrations with the experimental data, and predicts the formation of byproducts such as CH₂O, CH₃HCO, CO and CH₃N0₂.
[디젤엔진부문] 플라즈미 반응기구조에 따른 코로나방전 및 NO₂전환 특성에 관한 연구
박용성(Yong-Seong Park),용기중(Gee-Joong Yong),엄성복(Seong-Bok Um),전광민(Kwang-Min Chun),이형상(Hyeong-Sang Lee) 한국자동차공학회 2001 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2001 No.11_1
The discharge started at lower voltage for the cathode corona than the anode corona. In contract Spark occurred higher voltage for the cathode corona. The anode corona showed higher NO to NO₂ conversion rate. The cone-hole type showed more stable discharge than the cone-plate type. As O₂ concentration increases, the NO to NO₂ conversion increases. It can be seen that the onset of combustion occurs at approximately 280℃ when using NO₂, while temperatures of around 480℃ are required to combust soot using 0₂