• Title/Summary/Keyword: DPF

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An Investigation of the Effect of Diesel Particulate Filter for Heavy-duty Diesel Engine on Emission Reduction (디젤입자상물질 여과장치의 배기저감성능 효과 분석)

  • Park, Yong-Hee;Shin, Dae-Yewn
    • Journal of Environmental Health Sciences
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    • v.33 no.1 s.94
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    • pp.36-42
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    • 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.

Analysis of an Automotive Fire Case that a Fire Broke out during Driving Immediately after DPF Cleaning (DPF 클리닝 직후에 주행 중 발생한 승용차화재 사례의 분석)

  • Lee, Euipyeong
    • Transactions of the Korean Society of Automotive Engineers
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    • v.24 no.5
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    • pp.556-565
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    • 2016
  • As a result of the enforced control of emission, many devices, including the diesel particulate filter, have been installed in diesel cars to reduce the emission of particulate matters. In this study, a car fire case has been investigated and analyzed. A car fire broke out after the vehicle traveled a distance of 1.4 km from a car service center. The car was provided with DPF cleaning when the DPF warning light came on. After being dismantled in the engine room, the car's engine and gearbox were investigated. The findings showed that the rear part of the DPF metal case was melted and punctured, while the honeycomb filter of the DPF was damaged. The car fire was caused by an overheated DPF associated with inaccurate maintenance practice. Therefore, the responsibility of the fire rested on the car service center that performed the DPF cleaning.

Measurement of Flow Velocity Distribution at Inlet and Exit of Diesel Particulate Filter (디젤 엔진 매연여과장치 입.출구에서의 유속 분포 측정)

  • Lee, Choong-Hoon;Choi, Ung;Bae, Sang-Hong;Lee, Su-Ryong
    • Journal of the Korean Society for Railway
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    • v.10 no.3 s.40
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    • pp.343-349
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    • 2007
  • The flow velocity distribution at inlet and exit of a DPF was measured using a Pitot tube and 2-D positioning equipment. An adaptor which was designed for accessing the Pitot tube probe into inlet of the DPF was fabricated with inlet flange of the DPF. The Pitot tube which was mounted in the 2-D positioning machine could access to the inlet of the DPF through the rectangular window of the adaptor. Automation of the velocity measurement at the inlet and exit of the DPF was effectively achieved and measuring time was reduced drastically. The flow velocity distribution at the inlet of the DPF showed parabola shape with maximum velocity near to the center of the DPF, as expected. The velocity distribution at the exit of the DPF showed crown shape, that is, the flow velocity distribution near to the center of the DPF is lower than that at surrounded peripheral region of the DPF.

Flow Uniformity Analysis of DOC-DPF System using CFD (CFD를 활용한 DOC-DPF 조합의 유동 균질도 분석)

  • Kim, Taehoon;Park, Sungwook
    • Journal of ILASS-Korea
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    • v.24 no.3
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    • pp.122-129
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    • 2019
  • Flow uniformity in aftertreatment system is an important factor in determining uniform catalytic reaction and filtration. In this study, variety types of DOC-DPF system design were analyzed to increase flow uniformity. For this analysis, ANSYS Fluent was used with porous media setup for DOC and DPF. Turbulent flow was modeled by standard $k-{\varepsilon}$ model excepting porous media. Uniformity index was utilized to evaluate the flow uniformity quantitatively. Reference design showed low velocity region because two large vortex were generated before baffle. When radius of DOC-DPF system was increased, exhaust pressure acting on the inlet decreases and velocity distribution was shifted to one side. When inlet pipe was set to axial center of DOC-DPF system velocity distribution was symmetric. However, flow was not dissipated until the front end of DOC and showed higher uniformity index. When the volume of DOC was reduced while fixed volume of entire DOC-DPF system and baffle plate is located downstream of the DOC-DPF system, there was improvement in uniformity index.

A Study on Flow Velocity Distribution at Inlet and Exit of Diesel Particulate Filter with L-Shape Inlet Connector Using Automatic Measurement (측정자동화에 의한 입구연결부 형상이 L-형인 디젤매연필터 입.출구에서의 유속 분포에 관한 연구)

  • Lee, Choong-Hoon;Bae, Sang-Hong;Choi, Ung;Lee, Su-Ryong
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.16 no.4
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    • pp.93-100
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    • 2007
  • The flow velocity distribution at inlet and exit of Diesel Particulate Filter(DPF) by fabricating L-shape connector with the DPF was measured using a Pitot-tube and 2-D transverse machine. An adaptor designed for making the Pitot tube probe access to the inlet and exit of the DPF was connected with the inlet and exit flange of the DPF, respectively. The Pitot tube which was mounted in the 2-D positioning machine could access to the inlet and exit of the DPF through the rectangular window of the adaptor. The L-shape connector in the DPF inlet has a flow guide which is a perforated steel pipe. The flow velocity distribution at the inlet of the DPF showed a chaotic velocity distribution which is different from that with a diffuser type connector. The velocity distribution at the exit of the DPF showed a crown shape which is similar to that of the diffuser type connector. The velocity distribution at the exit of DPF showed different patterns according to the air flow rate.

Influence of Driving Pattern on Regeneration Performance of Continuously Regenerating Diesel Particulate Filter (연속재생 DPF의 재생 성능에 미치는 차량 운행패턴의 영향)

  • Hwang, Jin-Woo;Lee, Chang-Sik
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.33 no.5
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    • pp.358-364
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    • 2009
  • This paper is to investigate the influence of driving patterns of slow and high speed vehicles on the performance of continuously regenerating diesel particulate filter(DPF) system matched with operating conditions in field application. The DPF performance test for field application was carried out for two identical DPFs installed to slow and high speed vehicles. A slow speed vehicle was selected among local buses which have driving patterns to repeat running and stop frequently, while a high speed vehicle was prepared to have long route of high speed over 60km/h like inter-city buses. In this test, the regeneration performance on the DPF of slow speed vehicle deteriorated because of high soot load index(SLI) in spite of same balance point temperature(BPT) distribution for high speed vehicle. The DPF of slow speed vehicle melted in the end because the rapid increase of back pressure caused high temperature over $1200^{\circ}C$ in the ceramic wall of DPF. The PM components like ash collected to the filter in the DPF were analyzed in order to investigate the cause of the defect and provide an operation performance of DPF system. In the result of the analysis, high levels of lubrication oil ash(Ca, Mg, P, Zn) were detected.

Experimental Study on Single Channel DPF Device Applying the Method of Internal 2-Way Rotary Valve (회전형 밸브를 적용한 단일채널내 2-Way 방식의 DPF장치에 대한 실험적 연구)

  • Ham, Seong-Hun;Youm, Kwang-Wook
    • Journal of the Korean Institute of Gas
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    • v.19 no.6
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    • pp.110-115
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    • 2015
  • In this paper it is proposed to solve the problem of particulate matter reducing apparatus of the current DPF. One exhaust gas passage 2-way controlled to purify the exhaust gas generated during combustion efficiently. Through the control of the rotary valve within a single device, it is possible to prevent the exhaust pressure increases due to particulate matter accumulate inside the developing DPF. Develop DPF device capable of inducing a high efficiency of the output in order to improve the problem of reducing the engine output and fuel efficiency.

Study on the Flow Characteristics Inside a Metal DPF System (메탈 DPF 시스템 유동특성 연구)

  • Han, Cheolheui;Chon, Munsoo
    • Journal of Institute of Convergence Technology
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    • v.3 no.1
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    • pp.31-35
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    • 2013
  • Unsteady fluid dynamics analysis of flow characteristics inside a Metal DPF system is done using a commercial CAE software, CFD-ACE+. The time profiles of both temperature and pressure of exhaust gas are given as initial conditions. It was found that the position of connecting pipes and the numbering of exhaust gases did not affect the flow uniformity. The presence of a DPF resulted in the significant flow nonuniformity effect on the flow characteristics at the inlet of the DPF. Present results can be applied to the selection of optimal geometry that produces uniform flow characteristics inside a DPF system.

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Reliability Assessment Criteria of Differential Pressure Sensor for DPF (자동차용 DPF 차압센서의 신뢰성 평가기준)

  • Chung, Wooyoung;Min, Joonwon;Park, Dongkyu;Choi, Jungwoon;Choi, Wooseok;Kim, Sidong
    • Journal of Applied Reliability
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    • v.15 no.1
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    • pp.67-75
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    • 2015
  • Differential pressure sensor for DPF (Diesel Particulate Filter) is the important part of a automobile exhaust system. This device measures the pressure of before DOC and after DPF to determine whether the DPF regenerate. In this paper reliability assessment criteria for DPF differential pressure sensor are established on terms of quality calcification test and lifetime test. The former quality certification test comprises general performance test and environmental test. Items which pass the test undergo lifetime test which guarantees the extent of mean lifetime with certain confidence.

An Experimental Study on Filtration Efficiency and BPT Characteristics by PM Loading in Partial-diesel Particulate Filter (포집량에 따른 p-DPF의 정화효율 및 BPT 특성에 관한 실험적 연구)

  • Oh, Kwang-Chul;Lee, Kyung-Bok;Lee, Chun-Beom
    • Transactions of the Korean Society of Automotive Engineers
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    • v.20 no.1
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    • pp.147-154
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    • 2012
  • The number of vehicles applied diesel engine are rapidly rising for fuel economy. Accompanying this trend, application of an after-treatment system is strictly required as a result of reinforced emission regulation. The Diesel Particulate Filter (DPF) system is considered as the most efficiency method to reduce particulate matter (PM) by car makers but also in retrofit market. In recently, various kinds of partial flow DPF are widely used for proper filtration performance and reducing of pressure drop but it is difficult to define the characteristics of these filters because the filtration mechanism is obscure according to the status of these systems. In this paper we investigated the characteristics of cell open type DPF according to the status of filter especially, PM loading. The PM loading mass in the p-DPF are predicted from increase of differential pressure of DPF and the trend of filtration efficiency so that we can measure filtration efficiency and Balance Point Temperature (BPT) of this p-DPF according to PM loading.