• 청정기술
• /
• 제26권1호
• /
• pp.22-29
• /
• 2020

최근 미세먼지 증가로 인하여 디젤엔진의 배출 규제가 강화됨에 따라 디젤 매연여과장치에 관심이 급증하게 되었으며, 특히 디젤 배기가스 후처리 장치의 고효율화에 대한 기술개발이 더욱 요구되고 있다. 이에 대한 일환으로서 디젤매연여과장치(diesel particulate filter, DPF) 내 배기가스의 유동 균일도를 향상시키고 배압을 낮추어서 배기가스처리 효율을 높이는 연구가 많이 되고 있다. 본 연구에서는 ANSYS Fluent를 이용하여 직경 12"의 DPF와 디젤산화촉매(diesel oxidation catalyst, DOC)를 장착한 디젤 매연여과장치에서의 배기가스의 유속과 온도, DPF IO ratio, Ash와 PM양에 따른 배압에 미치는 영향을 시뮬레이션 하여 배압을 낮추는 최적화 연구를 하였다. 결과로서 배기가스의 온도와 유속이 낮을수록 배압이 낮아졌으며, PM양이 Ash양보다 배압에 더 큰 영향을 주는 것으로 나타냈다. 또한 비대칭 DPF가 대칭 DPF에 비해 배압이 더 낮게 나타냈으나, 유동 균일도의 경우는 다양한 변수에 관계없이 일정하게 나타냈다. european stationary cycle (ESC), european transient cycle (ETC) 조건에서 PM의 정화효율은 비대칭, 대칭 DPF 관계없이 유사하나, particle number (PN)의 정화효율에서는 비대칭 DPF가 대칭 DPF에 비해 높게 나타냈다.

• 한국연소학회:학술대회논문집
• /
• 한국연소학회 제26회 KOSCO SYMPOSIUM 논문집
• /
• pp.21-26
• /
• 2003

Diesel particulate trap is a core technology for the reduction of PM from diesel vehicles This study presents the features and the characteristics of DPF system when using pellet type filters. In comparison with wall-flow filter, the pellet filter has the advantages of cracking free during regeneration and shape flexibility. Experiments are conducted in a test bench simulated as diesel engine exhaust condition. Pressure drop and particle loading rate was compared by using two pellet filters having the porosity of 70% and 0%. Also its regeneration was tested.

• 한국자동차공학회논문집
• /
• 제12권3호
• /
• pp.66-74
• /
• 2004

DPF technology has been considered as one of the most effective methods for reducing diesel particulate emission. PSA Peugeot Citroen introduced the DPF equipped diesel passenger car, Peugeot 607 HDI Sedan, in 2000 for the first time in the world, in which SiC filter, an oxidation catalyst, cerium based fuel born catalyst and post-injection technology were used for PM regeneration. In the present study, the characteristics of the Peugeot 607 DPF system were studied on chassis dynamometer and real road driving conditions. The change of emissions and fuel economy during 80,000km operation were also tested. Additionally, ash contents accumulated in the DPF filter was analyzed and particle size distributions was investigated after running of 80,000km.

• 한국연소학회지
• /
• 제8권1호
• /
• pp.9-16
• /
• 2003

Carbon soot emission from combustion processes, especially from diesel engines, is a subject of growing concern since soot is known to seriously affect human health. Efforts have been made to oxidize soot particles utilizing Non-Thermal Plasma(NTP) techniques. When oxygen is carried into a plasma device, electrons generated by the plasma dissociate the oxygen, resulting in the formation of oxygen atoms. These highly activated atoms, called O radicals, are known as strong oxidizing agent. This paper presents concentration variations of CO and $CO_2$ at the exit of the plasma device, resulting from the soot oxidation by O radicals, with variations of inlet oxygen concentration, gas temperature, and gas flow rate. Based on the data, Arrehenious rate constants of reactions between C(s)+O and C(s)+O+O were proposed.

• 한국대기환경학회:학술대회논문집
• /
• 한국대기환경학회 2003년도 추계학술대회 논문집
• /
• pp.181-182
• /
• 2003

경유엔진은 가솔린엔진에 비해 연소특성상 연료소비효율이 우수하여 온실가스인 $CO_2$ 배출이 적은 반면 대기 및 인체위해성이 높은 NOx와 입자상물질(PM)의 배출이 많아 대기저감을 위한 연료의 고압분사, 전자제어식 EGR기술등 엔진개량기술과 매연여과장치, De-NOx등 후처리기술 그리고 대체연료사용 기술등 다양한 저감대책이 전세계적으로 강구되고 있다. 특히 경유엔진에서 배출되는 오염물질로 인한 대기오염영향은 점차 증가하고 있어 대체연료사용 및 배출허용기준강화둥 우리 실정에 적합한 효율적인 대기저감대책이 강구되어야 할 것이다. (중략)

• 한국자동차공학회논문집
• /
• 제14권6호
• /
• pp.127-136
• /
• 2006

Prediction of diesel particulate filtration is typically made by virtue of modeling of particulate matter(PM) collection. The model is closed with filtration parameters reflecting all small scale phenomena associated with PM trapping, and these parameters are to be traced back by inversely analyzing large-scale empirical data-the pressure drop histories. Included are soot cake permeability, soot cake density, soot density in the porous filter wall, and percolation constant. In the present study, a series of single channel DPF experiment is conducted, pressure histories are inversely analyzed, and the essential filtration parameters are deducted by DPF filtration model formulated with non-linear description of soot cake regression. Sensitivity analyses of model parameters are also made. Results showed that filtration transients are significantly altered by the extent of percolation constant, and the soot density in the porous filter wall is controlling the filtration qualities in deep-bed filtration regime. In addition, effect of soot particle size on filtration quality is distinct in a period of soot cake regime.

• 한국자동차공학회논문집
• /
• 제15권1호
• /
• pp.78-88
• /
• 2007

In the present study a detailed examination of various porous media models for predicting filtration efficiency and pressure drop of diesel particulate filter (DPF), such as sphere-in-cell and constricted tube models, are attempted. In order for demonstrating their validities of correct estimation on permeability, geometry of property configurations common in commercial cordierite DPFs are correlated to the porous media flow models, and validations of predicted filtration efficiencies due to the use of different unit collectors are made with experiments. The result shows that the porosity, pore size and permeability of cordierite DPF can be successfully correlated by Kuwabara flow field with correction factor of 0.6. The unit collector efficiency predicted by sphere-in-cell model agrees very well with measurements in accumulation mode, whereas that by constricted tube model with significant prediction error.

• 동력기계공학회지
• /
• 제10권2호
• /
• pp.11-15
• /
• 2006

The increasing numbers of automobiles keep causing air-pollution problems worse than ever. Nowadays, research on catalyst converter and filter trap as a modern technology is very active because PM is designated as a major cancer material and stringent regulations on this are necessary and required. This research emphasized on the development of Continuously Regenerating DPF technology which was the best particulate matters removing technology of current existing technology because of its superior comparability and high applicability. This experimental study has been conducted with equipped and unequipped a Continuously Regenerating DPF ona displacement 7,000cc diesel engine and compared in terms of engine performance and emission. To measure the emission, D-13 mode is applied and measured quantities of the exhaust gases, particularly in CO, HC, PM, and NOx. Therefore, this research is focused on engine performance and characteristics on exhaust emissions with the application of a Continuously Regenerating DPF in a heavy-duty diesel vehicle.

• 한국자동차공학회논문집
• /
• 제13권2호
• /
• pp.52-57
• /
• 2005

The increasing automobiles continue to cause air-pollution problem s worse than ever. In fact, many automobile research are involved in how to reduce exhaust emissions effectively specially in $NO_X$ and PM to comply with stringent emission standards, Euro V. This research emphasized on the development of continuous regeneration DPF technology which was one of promising removing technology of particulate matters because of its comparability and high applicability. In addition, this research discussed on some design points of view through correlation study by com paring the experimental data with computational results by the introduction of commercial codes such as CFD-ACE+ and KIVA-3V. The numerical simulation on the performance of continuous regeneration DPF apparatus and corresponding emission characteristics has been predicted well enough and verified with experimental results. The pressure and average temperatures are decreased to about 2.6% and 1.4% respectively under a full engine load condition mainly due to back pressures raised by diesel particulate filter. Pressure, temperature and heat releasing rates tend to decrease specially at higher engine load, but they are not affected at lower engine load regions.

• 한국환경보건학회지
• /
• 제33권1호
• /
• pp.36-42
• /
• 2007

Diesel PM can be controlled using Diesel Particulate Filter, which can effectively reduce the level of soot emissions to ambient background levels. In the Heavy Duty Diesel area, the Continuously Regeneration trap has been widely applied in the retrofit market. As the Special act for the improvement of air quality in the capital area, the retrofit program for DPF to used diesel vehicle has progressed favorably and there are currently over 1,000 of these DPF in use in retrofit applications in korea. These DPF comprise a specially formulated Diesel Oxidation Catalyst upstream of a DPF. The $NO_2$ generated by the DOC is used to combust the carbon collected in the DPF at low temperature. To certificate DPF device that is suitable to domestic circumstances, it is necessary to evaluate exactly the DPF devices according to the regulation of DPF certificate test procedure for retrofit(ministry of environment(MOE) announcement NO. 2005-16). To do so the understand of that regulation like the standard of PM reduction rate is needed. In this study the test procedure including test cycle and BPT test condition was examined and also the test result for specific DPF was analyzed. In every test like field test, PM reduction efficiency test and seoul-10 mode test, no defect could be showed.