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한용택(Yong-Taek Han),배귀남(Gwi-Nam Bae),이진하(Jin-Ha Lee),여권구(Gwon-Koo Yeo) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In this study, a combustion aerosol generator system was designed and developed and several parametric study was performed experimentally. Particle size distributions were measured using a scanning mobility particle sizer(SMPS). An electric furnace was utilized to control the temperature of simulated gas. The particle size distribution and temperature along with the simulated exhaust pipe was measured. There could be several mechanisms for particle movement and generation, and we thought that thermophoresis, nucleation, and condensation could be generated for the behavior of particles in this system. The size distribution of aerosols generated from the combustion aerosol generator was highly dependent on the combustion air, and it was insensitive to other parameters. Particle formation in a tube furnace was observed when the furnace temperature were higher than 450℃. In the simulated exhaust pipe, the particle loss due to thermophoresis was also monitored at the high temperature.
상용차용 요소-선택환원촉매 시스템의 탈질성능에 관한 연구
한평현(Pyung Hyun Han),김규홍(Gyu Hong Kim),길정기(Jeong Ki Kil),여권구(Gwon Koo Yeo) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The effect of various factors on NOx conversion was investigated for urea-SCR, the selective catalytic reduction using urea as reducing agent. Zeolite-based SCR catalysts were tested in the ESC test cycle using a 4L diesel engine, with and without diesel oxidation catalyst. The theoretical maximum NOx conversion was considered based on the SCR kinetics and it was compared with the NOx conversions obtained experimentally on various experimental conditions. NH₃/NOx ratio, NO₂/NOx ratio and reaction temperature are the main factors affecting the DeNOx performance of SCR system. Additionally, the distance between urea dosing point and SCR catalyst significantly influences the performance of SCR catalyst.
이준규(Joon Kyu Lee),이제형(Je-Hyung Lee),여권구(Gwon-Koo Yeo),김문성(Moon-Sung Kim) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
To develop the multiple injection strategy in a HSDI diesel engine, optimization analysis was applied. The optimization analysis has 3 steps. The 1<SUP>st</SUP> step is spray characteristic analysis through the common rail injector modeling with HYDSIM. The 2<SUP>nd</SUP> step is 3-D combustion analysis and verification for the base operating condition with KIVA3Y. The 3<SUP>rd</SUP> step is optimization procedure with KIVA3V and ISIGHT. Above all, the optimization procedure also consists of3 steps. The 1st step is DOE(Design of Experiment), The 2<SUP>nd</SUP> step is Approximation, and the 3<SUP>rd</SUP> step is optimization. All of these procedures were very effective and all results agreed well with the experimental data. Through all of these procedure, optimized multiple injection condition reducing emissions(NOx, Soot) and combustion noise(CNL) without penalty of fuel consumption(BSFC) could be evaluated.
마이크로 벤치-플로우 리액터를 이용한 LNT 촉매의 NO 흡장과 정화성능에 관한 연구
윤주웅(Joo Wung Yoon),황승권(Seung Kwon Hwang),황인구(In Goo Hwang),박심수(Simsoo Park),이진하(Jin Ha Lee),여권구(Gwon Koo Yeo) 대한기계학회 2011 大韓機械學會論文集B Vol.35 No.8
본 연구에서는 디젤엔진에서 배출되는 질소산화물의 저감을 위한 후처리장치인 LNT(Lean NOx Trap, 흡장형 De-NOx 촉매)의 특성을 파악하였다. 먼저 희박한 배출가스 상태에서의 질소산화물 중 산화질소에 대한 촉매의 기본적인 흡장성능을 알아본 후, 다양한 환원제를 분사하여 인위적으로 배출가스를 농후한 상태를 만들었다. 농후한 상태에서는 희박한 상태에서 촉매 내에 흡장되어 있던 산화질소가 촉매의 환원반응에 의해서 질소로 전환된 후 촉 매후단부에서 산화질소 배출농도를 측정하였다. 본 연구에서 사용된 LNT(Lean NOx Trap)시편은 실제 디젤 차량에 서 사용되는 LNT 촉매로부터 Reactor에 장착될 수 있도록 작은 사이즈로 절단 및 가공된 후, SUS304의 stainless 재질로 재가공 처리한 후에 Micro bench-flow reactor에 장착하였다. 분사된 피드가스성분들은 실제 배출가스의 분위기를 만들기 위해서 각각 3가지의 가열성분, 비가열 성분으로 나누어 분사된다. 이러한 조건들에서 다양한 반응온도와 공간속도를 반응변수로 하여 LNT(Lean NOx Trap)의 흡장성능과 환원제종류에 따른 산화질소의 배출특성을 파악하였다. We carry out an experimental investigation to analyze the basic performance of NO(nitric oxide) storage in a lean phase and also analyze the NO reduction achieved by the spraying of reducing agents in the rich phase of the exhaust gas in an LNT(Lean NOx Trap). This is an after-treatment system used to reduce the NOx emissions from a diesel engine. If the stored NO is reduced, we measure the outlet concentration downstream of the LNT. The test LNT material used in the experiments is commercial LNT. After being canned into stainless-steel (SUS304), it was built in a micro bench-flow reactor. Compositions of feed gases, three heated and three no heated gases were sprayed upstream of the LNT to analyze the characteristics. We use various temperatures and space velocities as response variables.
디젤 SCR 후처리장치 내 공간속도가 NOx 저감에 미치는 영향
왕태중(Tae Joong Wang),백승욱(Seung Wook Baek),강대환(Dae Hwan Kang),길정기(Jung Ki Kil),여권구(Gwon Koo Yeo) 한국연소학회 2006 KOSCOSYMPOSIUM논문집 Vol.- No.-
The present study conducted a numerical modeling on the diesel SCR (selective catalytic reduction) system using ammonia as a reductant over vanadium-based catalysts (V₂O?-WO₃/TiO₂). Transient modeling for ammonia adsorption/desorption on the catalyst surface was firstly carried out, and then the SCR reaction was modeled considering for it. In the current catalytic reaction model, we extended the pure chemical kinetic model based on laboratory-scale powdered-phase catalyst experiments to the chemico-physical one applicable to realistic commercial SCR reactors. To simulate multi-dimensional heat and mass transfer phenomena, the SCR reactor was modeled in two dimensional, axisymmetric domain using porous medium approach. Also, since diesel engines operate in transient mode, the present study employed an unsteady model. In addition, throughout simulations using the developed code, effects of space velocity on the DeNOx performance were investigated.