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전광민,Chun, Kwang-Min 대한설비공학회 1982 설비저널 Vol.11 No.1
The water-hammer phenomena caused by pump power failure are analysed by digital computer. Asan cool ins water pipe system has been chosen as a model. It is Shown that after power failure the pressure at the pump outlet drops sharply, and to prevent reverse flow, either butterfly valve or check valve can be used. After the valve closure, pressure oscillates behind the valve. To weaken the pressure wave, it is recommended to install a servo-operated valve in a bypass Line around the pamp and the check valve.
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.
수소와 일산화탄소를 이용한 멀티채널 CDPF의 재생특성에 관한 연구
최광춘(Kwang Chun Choi),전광민(Kwang Min Chun),송순호(Soonho Song) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
Diesel particulate filter(DPF) systems are being used to reduce the particulate matter emission of diesel vehicles. The DPF should be regenerated after certain driving hours or distance to eliminate soot in the filter. The most widely used method is active regeneration with oxygen at 550~650℃. Syngas(synthetic gas) can be used to regenerate the Catalyzed DPF(CDPF). The syngas was made by CPOx(Catalyzed Partial Oxidation) at reformer, that of mainly helpful component at DPF regeneration is hydrogen and carbon-monoxide. We use the hydrogen and carbon-monoxide model gas for regeneration characteristic of filter regeneration. The oxidation characteristics of PM with model gas supplied to filter were studied using partial flow system that can control temperature and flow rate independently. The filter is coated with washcoat loading of 25g/ft³ Pt/Al₂O₃-CeO₂, and multi-channel CDPF(MC-CDPF) was used. The DPF regeneration experiments were performed to investigate the effect of syngas exothermic reaction on soot oxidation in the filter. Before oxidation experiment, PM was collected about 8g/L to the filter at engine condition of 1500rpm, bmep 8bar and flow temperature of 200℃. Various conditions of temperature and concentration of H₂, CO gas were used for the tests. Regeneration of soot in the filter started at 2% H₂ and CO concentration respectively and inlet temperature of 250℃. Filter Regeneration occurs more actively as the model gas concentration becomes higher.