• 한국자동차공학회논문집
• /
• 제14권4호
• /
• pp.68-76
• /
• 2006

The minimization of maximum DPF wall temperature and the fast Light-off during regeneration are the targets for the high durability of the DPF system and the high efficiency of regeneration. In order to predict transient thermal response of DPF, one-channel numerical modeling has been adopted. The effect of the ratio of length to diameter(L/D), cell density, the amount of soot loading on temporal thermal response and regeneration characteristics has been numerically investigated under two different running conditions: city driving mode and high speed mode. The results indicate that the maximum wall temperature of DPF increase with increasing 'L/D' in 'High speed mode'. For 'City driving mode', the maximum wall temperature decreases with increasing 'L/D' in the range of $'L/D{\geq}0.6'$. The maximum temperature decreases with increasing cell density because heat conduction and heat capacity are increased. It is also found that the effect of amount of soot loading on light-off time is negligible.

• 대한기계학회:학술대회논문집
• /
• 대한기계학회 2003년도 춘계학술대회
• /
• pp.2245-2250
• /
• 2003

Particulate matters(PM) have bad effect on the health. We carried out measurements of diesel PM under $10{\mu}m$ diameter from a HSDI diesel engine with a diesel oxidation catalyst(DOC) by using the ELPI. This paper compares the two results of the smoke level and the PM level of masses and numbers. We also investigated the effect of the DOC. Under high speed and load, HSDI diesel engine exhausts much masses of particulate matters over 100nm diameter, and a number of PM from 7 to 100nm diameters at the same condition. DOC could reduce the total mass of the PM. However, the DOC could increase the number of ultra fine PM. Before light-off of the soot, the DOC absorb the PM and the DOC oxidize the PM after light-off temperature. The fine PM could be made during the oxidation. Therefore, the advanced DOC is needed to reduce the number of the fine PM.

• 한국자동차공학회논문집
• /
• 제13권4호
• /
• pp.167-173
• /
• 2005

Thermal regeneration means burning-off and cleaning-up the particulate matters piled up in DPF(diesel particulate filter), and it requires both high temperature $(550\~600^{\circ}C)$ and appropriate concentration of oxygen at DPF entrance. However, it is not easy to satisfy such conditions because of the low temperature window of the HSDI(high speed direct injection) diesel engine(approximately $200\~350^{\circ}C$ at cycle). Therefore, this study is focused on the method to raise temperature using the trade-off relation between temperature, oxygen concentration, and the influence of many parameters of common rail injection system including post injection. After performing an optimal mapping of the common rail parameters for regeneration mode, the actual cleaning process during regeneration mode is investigated and evaluated the availability of the regeneration mode mapping through regenerating soot trapped in the DPF.

• Korean Chemical Engineering Research
• /
• 제57권4호
• /
• pp.584-588
• /
• 2019

디젤엔진 시스템은 미세먼지 배출의 엄격해진 저감/제어 기준을 충족하기 위해서 산화촉매는 매우 중요한 기술 중에 하나이다. 본 연구에서는 효율적인 soot산화의 촉매로 Ag 나노입자가 loading된 $La_{0.6}Sr_{0.4}Co_{0.2}Fe_{0.8}O_3$ 섬유상 web 촉매를 제시하였다. 제조된 촉매는 FE-SEM, EDS mapping, XRD, XPS 분석을 통해 특성을 평가하였다. Soot 산화성능측정결과 Ag의 효율적인 촉매특성과 증가된 soot입자와 표면의 접촉면적으로 인하여 50% 산화온도 평가($T_{50}=490^{\circ}C$)에서 자연적인 산화보다 $151^{\circ}C$ 가속화된 것을 확인하였다. 따라서 Ag가 loading된 촉매와 3차원적인 web 구조는 soot 산화에 효율적인 촉매후보군으로 확인하였다.

• 한국연소학회:학술대회논문집
• /
• 한국연소학회 2012년도 제45회 KOSCO SYMPOSIUM 초록집
• /
• pp.183-186
• /
• 2012

The characteristics of particulate matters (PM) from an exhaust gas for conventional and low temperature diesel combustion (LTC) in a compression ignition engine was experimentally investigated by the elemental, thermogravimetric analysis. Morphology of PM was also studied by the transmission electron microscopy. PM for LTC shows that it contains more volatile hydrocarbons, which can be easily evaporated than conventional regime. PM for LTC is comprised of smaller primary particles.

• International Journal of Automotive Technology
• /
• 제7권3호
• /
• pp.261-267
• /
• 2006

Understanding the mechanism of carbon oxidation is important for the successful modeling of diesel particulate filter regeneration. Carbon oxidation characteristics were investigated by temperature programmed oxidation(TPO) method as well as constant temperature oxidation(CTO) with a flow reactor including porous bed. The activation energy of carbon oxidation was increasing with temperature and had two different constant values in the early and the later stage of the oxidation process respectively in TPO experiment. Kinetic constants were derived and the reaction mechanisms were assumed from the experimental results and a simple reaction scheme was proposed, which approximately predicted the overall oxidation process in TPO as well as CTO.

• 한국산학기술학회논문지
• /
• 제7권5호
• /
• pp.788-792
• /
• 2006

본 논문은 터보가 장착된 8000cc 대형디젤엔진에 연속재생장식 매연저감장치를 장착함으로써 기관성능과 배기가스에 대한 영향을 알아보기 위하여 수행되었으며, 실험 조건은 황 함량이 430ppm 인 표준 디젤 연료와 황 함량이 50ppm인 저유황 연료의 조건 하에서 이루어졌다. CO, HC, NOx 및 PM은 D-13 모드에서 수행되었고 매연은 D-3 모드를 기준으로 배기가스 실험이 진행되었다.

• 한국마린엔지니어링학회:학술대회논문집
• /
• 한국마린엔지니어링학회 2006년도 전기학술대회논문집
• /
• pp.293-294
• /
• 2006

This paper aims to simulate by FDS(Fire Dynamics Simulator) the distributions of temperature and smoke on fires in accommodations on boards. The paper focuses on analysis of temperature at fire occurrence and soot density. The purpose of this study is to predict the possibility of safe escape and efficient fire extinguishing method using fire simulation results.

• 해양환경안전학회:학술대회논문집
• /
• 해양환경안전학회 2017년도 추계학술발표회
• /
• pp.137-137
• /
• 2017

• 한국환경과학회지
• /
• 제13권7호
• /
• pp.619-626
• /
• 2004

We have studied the catalytic combustion of soot particulates over perovskite-type oxides prepared by malic acid method, The catalysts were modified to enhance the activity by substitution of metal into A or B site of perovskite oxide. In addition, the reaction conditions such as temperature and $O_2$ concentration were investigated. The partial substitution of alkali metals into A site in the $LaMnO_3$ catalyst, enhanced the catalytic activity in the combustion of carbon particulate and the activity was shown in the order: Cs > K > Na. For the $La_{1-x}Cs_{x}MnO_{3}$ catalysts, the catalytic activity showed the maximum value with x=0.3 but no more increase on the catalytic activity was shown with x > 0.3. For the $La_{0.8}Cs_{0.2}MnO_{3}$ catalyst, the substitution of Fe or Ni increased the ignition temperature. The ignition temperature decreased with an increase of $O_2$ concentration, however, no more increase in the catalytic activity was shown with $O_2$ concentration > 0.2. The introduction of NO into reactants showed no effect on the catalytic activity.