• Title/Summary/Keyword: diesel particulate

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Effects of Regeneration Parameters on Oxidation of Particulate in a Diesel Particulate Trap System (디젤 입자상물질 후처리 장치에서 입자상물질의 연소에 미치는 재생 인자의 영향)

  • Kim, J. U.;Cho, H.;Kim, H. U.;Park, D. S.;You, C.;Kim, E. S.
    • Transactions of the Korean Society of Automotive Engineers
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    • v.6 no.2
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    • pp.168-177
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    • 1998
  • The effects of the regeneration parameters such as inlet gas temperature, space velocity, oxygen concentration of the exhaust gas, and initial particulate loading on the oxidation of the particulate inside ceramic cordierite filter have been investigated through an engine experiment. As the inlet gas temperature increases, the remarkable filter temperature occurs owing to the rapid combustion rate. Though the higher space velocity affirms the safe regeneration, it also requires much fuel consumption of the burner. For that reason, the space velocity should be compromised considering the fuel economy. The excessive accumulation of the particulate may cause undesirable regeneration temperatures inside filer even under the optimized regeneration condition. The inlet gas temperature should be selected to overcome the variation of the oxygen concentration which is inherent feature of the diesel engine. It is the most important factor in the regeneration control techniques.

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Development of Plasma Assisted Burner for Regeneration of Diesel Particulate Filter (매연여과장치 재생을 위한 플라즈마 응용 버너 개발)

  • Cha, Min-Suk;Lee, Dae-Hoon;Kim, Kwan-Tae;Lee, Jae-Ok;Song, Young-Hoon;Kim, Seock-Joon
    • Journal of the Korean Society of Combustion
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    • v.12 no.4
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    • pp.8-13
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    • 2007
  • Plasma assisted combustion is an old subject for the combustion society, but recently, the subject is refocused partly because techniques for non-thermal plasmas are progressed significantly, and partly because there are lots of applications which need to be overcome by a new reaction technology. In the present study, we have developed plasma assisted burner (plasma burner), which can be used as a heating source in a diesel particulate filter system. The burner can burn 20-60 cc/min of diesel fuel with 50 lpm of fresh air in an exhaust pipe of 2.0 liter diesel engine. Using 20 cc/min of diesel fuel, an exhaust temperature for 2.0 liter diesel engine can be raised up to around $600^{\circ}C$ for a wide range of engine speed (idle-3,000 rpm). The characteristics of the plasma burner are reported, and the possible operating mechanism of it will be discussed based on the effects of an electric field and a plasma on flames.

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OXIDATION CHARACTERISTICS OF PARTICULATE MATTER ON DIESEL WARM-UP CATALYTIC CONVERTER

  • Choi, B.C.;Yoon, Y.B.;Kang, H.Y.;Lim, M.T.
    • International Journal of Automotive Technology
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    • v.7 no.5
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    • pp.527-534
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    • 2006
  • Modern passenger cars with diesel engines are equipped with DOC(diesel oxidation catalyst) for the purpose of reducing HC and CO in the exhaust stream. Cold start exhaust emissions pose troubles here as on gasoline engine vehicles. As a result, some of the diesel passenger cars roll off todays the assembly lines with WCC(warm-up catalytic converter). Oxidation characteristics of the particulates in WCC is analyzed in this study by EEPS(engine exhaust particulate size spectrometer). The maximum number of PM is found to come out of WCC in sizes near 10nm when an HSDI diesel engine is operated under the conditions of high speed and medium to heavy load. When the temperature of the WCC exceeds $300^{\circ}C$, the number of PM smaller than 30 nm in diameter sharply increases upon passing through the WCC. Total mass of emitted PM gets reduced downstream of the WCC under low speed and light load conditions due to adsorption of PM onto the catalyst. Under conditions of high speed and medium to heavy load, the relatively large PM shrink or break into fine particles during oxidation process within the WCC, which results in more mass fraction of fine particles downstream of the WCC.

A Study on PM Regeneration Characteristics of Diesel Passenger Vehicle with Passive Regeneration DPF System (자연재생방식 DPF시스템 부착 경유승용차량의 PM재생 특성 연구)

  • Lee, Jin-Wook;Cho, Gyu-Baek;Kim, Hong-Suk;Jeong, Young-Il
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.31 no.2 s.257
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    • pp.188-194
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    • 2007
  • New diesel engines equipped with common-rail injection systems and advanced engine management control allow drastic decreases in the production of particulate matters and nitrogen oxides with a significant advantage in terms of the fuel consumption and $CO_2$ emissions. Nevertheless, the contribution of exhaust gas after treatment in the ultra low emission vehicles conception has become unavoidable today. Recently the passive type DPF(Diesel Particulate Filter Trap) system for diesel passenger vehicle has been manufactured into mass production from a French automotive maker since the year of 2000. This passive DPF system fully relies on the catalytic effects from additives blended into the diesel fuel and additives injected into the DPF system. In this study, the effects of PM regeneration in the commercial diesel passenger vehicle with the passive type DPF system were investigated in chassis dynamometer CVS(constant volume sampler)-75 mode. As shown in this experimental results, the DPF regeneration was observed at temperature as low as $350^{\circ}C$. And the engine-controlled the DPF regeneration founded to be one of the most promising regeneration technologies. Moreover, the durability of this DPF system was evaluated with a season weather in terms of the differential pressure and exhaust gas temperature traces from a road test during the total mileage of 80,000km.

An Experimental Study on Exhaust Gas Reduction of Diesel Oxidation Catalyst by CVS-75 Mode in Light Duty Diesel Engine (小型디젤機關에서 CVS-75 모드에 따른 디젤 酸化觸媒裝置의 排出가스 低減에 關한 實驗的 硏究)

  • 한영출;김종춘;오용석
    • Journal of Korean Society for Atmospheric Environment
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    • v.15 no.4
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    • pp.457-461
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    • 1999
  • Recently, increasing usage of diesel vehicle, many countries try to reduce the pollutant materials by emission regulation standard. Particularly, in our country, the supplement ratio of diesel vehicle is high, and air pollution by particulate matter(PM) is very serious. So, in theoretical study wer analyzed the formation principle of gaseous emission and PM, the characteristics of CVS-75 mode. In experimental study, we tested exhaust gas reduction of emission and PM, the characteristics of CVS-75 mode. In experimental study, we tested exhaust gas reduction of disel oxidation catalyst(DOC) by CVS-75 mode in light duty diesel vehicle. In case of an automobiletest with the 2,956cc diesel engine which DOC was equipped, CVS-75 mode which is similar to driving conditions on the road was chosen as the restrictive mode of light duty diesel automobile in our country. According to the Pt, the reduction rate of exhaust emission was estimated with using 0.1% high sulfur fuel and 0.05% low sulfur fuel.

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Characteristics of Nano-particles Exhausted from Heavy-duty Diesel Vehicles with Low Emission Technology (대형경유차 저공해기술 적용에 따른 나노입자 배출특성)

  • Lim Cheol-Soo;Yoo Jung-Ho;Eom Myoung-Do;Hwang Jin-Woo;Kim Ye-Eun
    • Journal of Korean Society for Atmospheric Environment
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    • v.20 no.2
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    • pp.225-236
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    • 2004
  • Diesel engines which emit a lot of PM and NOx have been known as a main air polluter. Especially, diesel particulate matters (OPM) including black smoke are hazardous air pollutants to human health and environment. The nations retaining advanced engine technologies have reinforced emission regulations. To meet these regulations diesel engine manufacturers have developed low-emission diesel engines, aftertreatment equipments, alternative fuel technologies and so on. In this study, particle number concentrations characteristics according to particle size and engine driving conditions were analyzed when these low-emission technologies were applied. There was a tendency of increasing particle number concentrations from heavy-duty diesel engines with increasing engine rpm and load rate. In the cases of COPF (Catalytic Diesel Particulate Filter), CNG (Compressed Natural Gas) engine and ULSD (Ultra Low Sulfur Diesel) more than 99% of particle number concentration were removed.

Study on Multi-Dimensional Simulation of the Flow and Filtration Characteristics in Diesel Particulate Filters (DPF의 배기가스 유동 및 포집에 관한 다차원 모델링 연구)

  • Kim, Dong-Kyun;Yoon, Cheon-Seog
    • Transactions of the Korean Society of Automotive Engineers
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    • v.18 no.3
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    • pp.60-68
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    • 2010
  • In order to understand the flow and filtration characteristics in a wall-flow type DPF(Diesel Particulate Filter), 0-D, 1-D, and 3-D simulations are preformed. In this paper, three model are explained and validated with each other. Based on the comparisons with 1-D and 3-D results for the steady state solution, 3-D CFD analysis is preferable to 1-D for the prediction of wall velocity at the inlet and exit plane. Because PM loading process is transient state phenomena, the combination of full 3-D and time dependent simulation is crucial for the configuration of wall channels. New coupling technique, which is the connection between calculated permeability from 0-D lumped parameter model and UDF(User Defined Functions) of main solver, is proposed for the realisti

Bioassay-Directed Chemical Analysis of Mutagens in Diesel Exhaust Particulate Matter (Dep)

  • Kim, Soung-Ho;Jang, Hyoung-Seok;Lee, Do-Han;Kim, Yun-Hee;Ryu, Byung-Taek;Oh, Seoung-Min;Chung, Kyu-Hyuck
    • Proceedings of the Korean Society of Toxicology Conference
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    • 2003.10b
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    • pp.153-153
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    • 2003
  • It has been reported that exposure to particulate matter is linked to increase lung cancer risk. Recently it is confirmed that diesel exhaust particulate matter (DEP), which derives from diesel powered vehicles, is contributed as a major pollutant in urban air-borne particulate matter.(omitted)

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An Analysis of Characteristics of Particulate Matter Exhausted from Diesel Locomotive Engines (디젤기관차 엔진에서 배출되는 입자의 특성분석)

  • 박덕신;김태오;김동술
    • Journal of Korean Society for Atmospheric Environment
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    • v.19 no.2
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    • pp.133-143
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    • 2003
  • Numerous evidence have been reported that fine particulate matters can play an important role in threatening human health. Recently concerns on fine particle pollution from various engines may require re-examination of particulate emission standards. The particles emitted by most diesel engines are mainly divided into their size ranges such as Dp< 50 nm and 50 nm< Dp< 1,000 nm. In this work, the number concentration and the size distribution of fine particles emitted from an exhaust manifold of a railroad diesel engine were measured under load test conditions using a scanning mobility particle sizer (SMPS). The fine particles observed were within the range of 7 to 304 nm under different load conditions with two different dilution ratios. The fine particles exhibited unique patterns showing bimodal shapes in size distribution.

A Study on the Characteristics of DPF System of Peugeot 607 Diesel Passenger Car (Peugeot 607 경유승용차의 매연여과장치 특성 분석)

  • 김홍석;김진현;신동길;조규백;정용일;김강출;이영재
    • Transactions of the Korean Society of Automotive Engineers
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    • v.12 no.3
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    • pp.66-74
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    • 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.