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배기가스 재순환을 적용한 희박-과농 연소시스템의 공해물질 배출특성 연구
오휘성(Wheesung Oh),이창언(Chang-Eon Lee),유병훈(Byeonghun Yu) 한국연소학회 2015 한국연소학회지 Vol.20 No.2
In this study, the CH4/air lean-rich combustion system with exhaust gas recirculation (EGR) was investigated to explore the potential for lowering pollutant emissions. To achieve this purpose, experiments of lean-rich combustion system with EGR were conducted to measure the changes in the characteristics of the pollutant emission and flame shape with various equivalence ratios and EGR rates. Here, this study was applied to the fuel distribution ratio of 3:1 for the formation of the lean and rich flames. Additionally, the results were compared with CH4/air lean premixed combustion system. The results show that flame shape of lean-rich combustion system was determined by lean and rich equivalence ratios (Φ L and Φ R) and stratified flame was formed with increasing Φ R. According to the pollutant emission characteristics based on experimental results, the NOx and CO emission index (EINOx and EICO) decreased with increasing EGR rate. Especially, in the range needed to form a stable flame, the reduction rates of EINOx and EICO were approximately 47% and 48% for an EGR rate of 25%, global equivalence ratio of 0.85 and Φ L of 0.80 compared with lean premixed combustion system (Φ = 0.78).
배기가스 재순환을 적용한 하이브리드 연소시스템에 대한 기초연구
오휘성(Wheesung Oh),유병훈(Byeonghun Yu),이창언(Chang-Eon Lee) 한국연소학회 2014 KOSCOSYMPOSIUM논문집 Vol.2014 No.5
The hybrid combustion system applying exhaust gas recirculation was investigated to achieve the low pollutant emission. In this study, it was studied the effects of EGR on NOx emissions with two type EGR methods(FI-EGR and FPI-EGR) and various EGR ratios. As results, when EGR was applied, NOx emission index decreased. In addition, hybrid combustion system showed a better result than non-premixed combustion system in terms of pollutant reduction at the same EGR ratios. Especially, in the case of 25% of FI-EGR ratio at hybrid combustion system that the falme ratio of non-premixed and premixed is 50:50, NOx emission index reduction rates were about 59%, and in the case of 15% of FPI-EGR ratio at hybrid combustion system that the flame ratio of non-premixed and premixed is 70:30 , NOx emission index reduction rates were about 48%.
상태방정식을 이용한 주유소 탱크에서의 유증기 배출량 산정법에 관한 연구
박태준(Taejoon Park),오휘성(Wheesung Oh),이창언(Chang-Eon Lee) 한국연소학회 2015 한국연소학회지 Vol.20 No.4
This study was investigated the estimation of VOCs (Volatile Organic Compounds) emission from a gas station tank. To improve the atmosphere environmental quality near the gas station, the installation of vapor recovery system has been expanded recently. Therefore, it was necessary to calculate VOCs emissions from the gas station tank with vapor recovery systems for evaluation of their performance. The VOCs emissions are difficult to measure directly because of various sources and irregularly emission by pressure rise. In this study, VOCs emissions were estimated by simple calculation based on the equation of state for measured pressure, temperature and volume of a gasoline tank at a gas station. The result confirmed that the present national emission factor did not have significant discrepancy with the calculated value.
박태준(Taejoon Park),오휘성(Wheesung Oh),유병훈(Byeonghun Yu),유승훈(Seunghun Yu),이창언(Chang-Eon Lee) 한국연소학회 2015 KOSCOSYMPOSIUM논문집 Vol.2015 No.5
To improve the atmosphere environmental quality near the gas station, the installation of vapor recovery system has been expanded recently. The vapor recovery system is divided into two parts. One control method for vapor emitted during oil unloading is called Stage Ⅰ, in which the cargo tank retrieves the vapor emitted during product unloading at the gas station. The other is Stage Ⅱ, in which the gas station tank retrieves the vapor emitted during oil unloading at the car. This study was investigated to develop prediction model for behavior of VOCs(Volatile Organic Compounds). Through prediction model, we estimated the VOCs emission factors according to season.