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이상수(Sangsu Lee),조규백(Gyubaek Cho),김진현(Jinhyun Kim),김홍석(Hongsuk Kim),이의성(Euisung Lee),오권오(Kwonoh Oh),한승한(Seunghan Han),김경재(Kyungjae Kim),정용일(Yeongil Jung) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The performance of radial type metal foam DPF was studied. The radial type metal foam DPF was built by rolling INCOfoam® HighTemp into a hollow cylinder and installing it inside the DPF can with a conical flow reflector. Several types of metal foam DPF were tested. They are different in filter thickness, mean pore size, and Platinum coating with 2.5g/l or not. The test mode was determined to simulate the on-road vehicle speeds on the engine bench. In the testing vehicle speeds, the SOF in total PM emissions was so high due to the low engine load that the PM reduction via Platinum coating was dominant. Compared with cordierite filters, the radial type metal foam DPF showed similar PM reduction rate but lower increase in Δp during engine run at steady engine conditions due to their large mean pore sizes. Compared with axial type metal foam DPF studied in previous studies, the radial type metal foam DPF provides 7 times higher filtering area which enables higher PM reduction rate and lower Δp across DPF. The Platinum coated radial type metal foam filter was proven to be suitable for the replacement for cordierite filter in that it provides slow increase in Δp but comparable PM reduction rate.
경유중 황성분이 Metal Foam 필터의 성능에 미치는 영향
이상수(Sangsu Lee),오권오(Kwonoh Oh),이의성(Euisung Lee),김홍석(Hongsuk Kim),정용일(Yongil Jung),조규백(Gyubaek Cho) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_1
The effects of sulfur contents on the performance of the metal foam DPF (Diesel Particulate Filter) were investigated. The metal foam, INCOFOAM? High Temp, was axially stacked in the exhaust pipe to reduce PM emissions. LSD (Low Sulfur Diesel) fuel which has sulfur content of about 300 ppm and ULSD (Ultra Low Sulfur Diesel) fuel which has sulfur content of below 50 ppm were used to compare the emissions. When the DOC (Diesel Oxidation Catalyst) was installed upstream of DPF and the LSD fuel was used, the PM reduction rates at high exhaust temperature were deteriorated because the DOC oxidized sulfur dioxide at high exhaust temperature which eventually forms sulfate particles during dilution. With DOC, BPT (Balance Point Temperature) was lowered from 420℃ to 360℃ due to the NO₂ formation inside the DOC, which is favorable for the DPF regeneration. Accordingly, when ULSD was used, the combination of DOC and DPF showed PM reduction rate of 70% and relatively low pressure difference across DPF, which are acceptable performance for DPF.
이정민(Jeongmin Lee),성낙원(Nakwon Sung),권오채(Oh Chae Kwon),김홍석(Gyubaek Cho),오권오(Hongsuk Kim),이의성(Euisung Lee),조규백(Gyuback Cho) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_1
Filtration process in a Diesel particulate filter (DPF) of metallic foam, INCOFOAM?HighTemp, has been studied analytically for the effects of filter configurations on pressure drops and filtration efficiencies. The concept of 'unit-cell' is applied for modeling filtration process in the metallic foam that is the prospective material for DPF due to the effectiveness in filtrating nano-scale particles and the large specific surface area for catalytic coating compared to the conventional honeycomb wall-flow monoliths. The structural properties such as strut diameters and porosities are determined from the pictures by a 3D X-ray scope. Permeability and Forchheimer coefficients of the INCOFOAM? HighTemp were obtained from clean filter experiments. Soot particles deposited inside the filter change the local collector diameter, porosity and permeability, which affect the particle filtration efficiencies and pressure drops. The results from the model show that filter length and thickness strongly affect pressure drops and filtration efficiencies, respectively. The optimal combination of filter length and thickness for the radial type DPF is suggested.
DPF용 금속폼의 투과도 및 Forchheimer 계수 측정
최현아(Hyunha Choi),이정민(Jeongmin Lee),성낙원(Nakwon Sung),권오채(Oh Chae Kwon),조규백(Gyubaek Cho),오권오(Kwonoh Oh),이의성(Euisung Lee) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_1
Recently metallic foam of Nickel-based super alloy (Inconel?HighTemp) is regarded as the prospective porous medium for DPF due the large specific area for the filtration and catalytic coating. Filtration efficiency and pressure drop between upstream and downstream of the DPF mostly depend on the exhaust gas flow properties and the micro-structural properties such as strut diameter and porosities. For modeling the filtration process, the micro-structural properties of the metallic foam are measured by using a 3D X-ray scope. And these parameters should be correlated with the porous media flow parameters such as permeability and Forchheimer coefficients evaluated from clean filter experiments. The some correlations arc examined and the best fit correlation suggested by Du Plessis is chosen for Inconel?HighTemp metallic foam.
박만호(Manho Park),이정민(Jeongmin Lee),이의성(Euisung Lee),홍승현(Seunghyun Hong),오권오(Kwonoh Oh),김기호(Kiho Kim),김재권(Jaekwon Kim),송호영(Hoyoung Song) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
In this study, passive type Metal Foam partial DPF characteristics was investigated. 70% target efficiency filter designed by Metal Foam Filter design program, was installed on D6DB(6.6L) engine exhaust line and PM removal efficiency & gas conversion rate by ND-13 mode was evaluated. The Filter has around 70% PM removal efficiency on whole soot loading level. When 7g/L soot loaded on the filter, the differential pressure is 280mbar on ND-13mode 10step air flow. But repeated ND-13mode test, there is no pressure drop gain.
김진현(Jinhyun Kim),이상수(Sangsu Lee),조규백(Gyubaek Cho),김홍석(Hongsuk Kim),이의성(Euisung Lee),오권오(Kwonoh Oh),차경옥(Kyongok Cha),정용일(Yongil Jeong) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Axial type metal foam filters were investigated to determine the feasibility as DPF filters in last study. In this study, catalyzed metal foam filters with 800um pore sizes were evaluated for the characteristics such as pressure drop and gas analysis. Pressure drop tests were performed in rig test bench, others were performed in engine test bench. To investigate the effects of flow rate and temperature on catalyzed metal foam filter, we controled engine rpm and load which correspond to 2400rpm(flow rate) or 290℃(upstream temperature of filter). Filters with same mean pore diameter showed high PM reduction rates and pressure drop as the filter thickness was increasing. But pressure drop was lower than cordierite DOC. Also increasing the thickness of filter exhaust gas was lower and the level was similar to codierite DOC.
금속폼 DPF 필터의 발생 배압 예측을 위한 실험적 연구
오정교(Jungkyo Oh),이정민(Jeongmin Lee),이의성(Euisung Lee),박만호(Manho Park),오권오(Kwonoh Oh),이병하(Byungha Lee) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
DPF is widely used to follow the emission regulation which is getting more stricter. The pressure drop by DPF is needed to be considered for design of DPF. In this study, the permeability and the forrchheimer coefficient which influence the pressure drop by metal foam filter will be decided through experiments. And this result will be applied to CFD analysis in order for introducing design elements for DPF through testing the permissible pressure of DPF
금속 폼 필터의 촉매 코팅에 따른 PM 저감 성능에 관한 연구
안석종(Seokjong An),조규백(Gyubaek Cho),최현하(Hyunha Choi),정용일(Youngil Jeong),이의성(Euisung Lee),오권오(Kwonoh Oh),한승한(Seunghan Han),김경재(Kyungjae Kim),박승룡(Seunglyong Park) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The air in cities has been heavily polluted by vehicle emissions. Above all, exhaust gases of diesel engines is the principal cause of these air pollutions. DOC is used to reduce harmful emissions, such as HC, CO and PM. But PM reduction rate of DOC is not enough. DPF is necessary to reduce PM and satisfy regulations. Metal foam is the one of promising materials in process on researches. Metal foam filter is available to use with catalytic coating. In case of catalytic metal foam, it reduce efficiency of PM reduction. In this study, we research the cause why efficiency of PM reduction is been worse and find out the most suitable condition.