• Title/Summary/Keyword: 디젤 매연여과장치

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Study on Estimation of PM Mass in DPF from Pressure Drop in 3L Diesel Engine (3L급 디젤엔진의 배압이용 DPF 매연포집량 예측에 대한 연구)

  • Kim, Hong-Suk;Lee, Jin-Wook
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.34 no.5
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    • pp.499-504
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    • 2010
  • It is important to determine the exact soot mass in a DPF system in order to control the timing of PM regeneration. The soot mass accumulated in a filter can be estimated from the pressure drop in the filter and the exhaust gas flow rates. In this study, the soot index is defined as the pressure drop in the DPF divided by the pressure drop in a DOC. An effective signal processing method for determining the soot index is proposed; the results yielded by this method indicate good correlation between the soot index and the amount of soot loaded into the filter for both steady-state and transient-state operating conditions in a 3L diesel engine for passenger vehicles.

Effect of Particulate Matter and Ash Amount on Pressure Drop and Flow Uniformity of Diesel Particulate Filter Reduction System (입자상물질과 Ash양이 디젤매연여과장치 내의 배압 및 유동균일도에 미치는 영향)

  • Kim, YunJi;Han, DanBee;Seo, TaeWon;Oh, KwangChul;Baek, YoungSoon
    • Clean Technology
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    • v.26 no.1
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    • pp.22-29
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    • 2020
  • Recently, as the fine dust is increased and the emission regulations of diesel engines have been tightened, interest in diesel soot filtration devices has rapidly increased. There is specifically a demand for the technological development of higher diesel exhaust gas after-treatment device efficiency. As part of this, many studies were conducted to increase exhaust gas treatment efficiency by improving the flow uniformity of the exhaust gas in the diesel particulate filter (DPF) and reducing the pressure drop between the inlet and the outlet of DPF. In this study, the effects of pressure drop by the flow rate and temperature of exhaust gas, DPF I/O ratio, Ash, and PM amount in diesel reduction device were simulated via a 12" diameter DPF and diesel oxidation catalyst (DOC) using ANSYS Fluent. As the flow rate and temperature decreased, the pressure drop decreased, whereas the PM amount affected the pressure drop more than the ash amount and the pressure drop was lower in anisotropic DPF than isotropic DPF. In the case of DPF flow uniformity, it was constant regardless of the various variables of DPF. In ESC and ETC conditions, the filtration efficiency for PM was similar regardless of anisotropic and isotropic DPF, but the filtration efficiency for PN (particle number) was higher in anisotropic DPF than isotropic DPF.

Reduction Characteristics of Diesel Nano-Particle by Diesel Particulate Filter (매연여과장치에 의한 경유미세입자 저감 특성)

  • 임철수;엄명도;류정호;김예은
    • Proceedings of the Korea Air Pollution Research Association Conference
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    • 2003.05b
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    • pp.327-328
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    • 2003
  • 경유자동차는 연료 특성상 매연을 포함한 입자상물질을 다량 배출하고 있으며, 이러한 디젤입자상물질은 인체에 유해한 발암성 및 돌연변이원성 물질들을 함유하고 있기 때문에 호흡 등을 통한 인체 유입시 건강에 매우 유해하다. 그러므로 디젤입자상물질을 저감시키기 위한 여러 가지 기술들 중 발생된 배출가스가 배기관을 통해 대기중으로 배출되기 전에 엔진 연소실과 배기관 사이에 후처리장치와 같은 기술들을 이용하여 이를 저감시키고 있다. 본 연구에서는 후처리장치들 중 세라믹필터에 백금과 같은 산화성이 우수한 촉매를 코팅하여 만든 촉매식 매연여과장치(DPF ; diesel particulate filter, SK제공)를 사용하였을 때 입자저감성능 및 입자크기별 분포특성을 살펴보고자 하였다. 이를 통해 도시대기오염 저감대책을 기초자료 및 환경학적, 보건학적 연구에 적극 활용하고자 한다. (중략)

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A Study of the Reduction of Diesel-Engine Emissions for Off-Road Vehicles (비도로 차량용 디젤엔진의 배기가스 저감에 관한 연구)

  • Cho, Gyu-Baek;Kim, Hong-Suk;Kang, Jeong-Ho
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.35 no.6
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    • pp.577-583
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    • 2011
  • To meet the requirements of the Tier 4 interim regulations for off-road vehicles, emissions of particulate matter (PM) and nitrogen oxides (NOx) must be reduced by 95% and 30%, respectively, compared to current regulations. In this research, both the DPF and HPL EGR systems were investigated, with the aim of decreasing the PM and NOx emissions of a 56-kW off-road vehicle. The results of the experiments show that the DOC-DPF system is very useful for reducing PM emissions. It is also found that the back pressure is acceptable, and the rate of power loss is less than 5%. By applying the HPL EGR system to the diesel engine, the NOx emissions under low- and middle-load conditions are reduced effectively because of the high differential pressure between the turbocharger inlet and the intake manifold. The NOx emissions can be decreased by increasing the EGR rate, but total hydrocarbon (THC) emission increases because of the increased fuel consumption needed to compensate for the power loss caused by EGR and DPF.

A Study on the Flow Characteristic of the Diesel Engine DPF (디젤엔진용 매연여과장치 내부유동 특성 연구)

  • Go, Hyun-Sun;Jung, Chan-Gyu;Lee, Heang-Nam
    • Journal of Advanced Marine Engineering and Technology
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    • v.36 no.1
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    • pp.109-117
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    • 2012
  • This paper addresses influence on the flow field by varying the length of DPF Inlet pipe in 5 ways. Numerical analysis is carried out by using PIV and commercial code and as a result, PIV and commercial code shows correlation correspond to 87%. Furthermore, in the same velocity condition, as stable and high pressure value is shown when the Inlet pipe length is 20mm, particulate filtering rate can be increased.

Experimental Investigation of Nano-sized Particulate Matter Emission Characteristics under Engine Operating Conditions from Common Rail Diesel Engine (커먼레일 디젤엔진의 운전조건이 나노크기 입자상 물질 배출특성에 미치는 영향에 관한 실험적 연구)

  • Lee, Hyung-Min;Myung, Cha-Lee;Park, Sim-Soo
    • Journal of Advanced Marine Engineering and Technology
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    • v.34 no.4
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    • pp.508-514
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    • 2010
  • The objective of this work presented here was experimental study of steadystate and cold start exhaust nano-sized particle characteristics from common rail diesel engine. The effect of the diesel oxidation catalyst (DOC) on the particle number reduction was insignificant, however, particle number concentration levels were reduced by 3 orders of magnitude into the downstream of diesel particulate filter (DPF). In high speed and load conditions, natural regeneration of trapped particle occurred inside DPF and it was referable to increase particle number concentration. As fuel injection timing was shifted BTDC $6^{\circ}CA$ to ATDC $4^{\circ}CA$, particle number concentration level was slightly reduced, however particle number and size was increased at ATDC $9^{\circ}CA$. Nucleation type particle reduced and accumulation type particle was increased on EGR condition.

A CFD Analysis on DPF for the Removal of PM from the Emission of Diesel Vehicle (디젤차량 배기가스의 PM 제거에 관한 매연여과장치 전산해석)

  • Yeom, Gyuin;Han, Danbee;Nam, Seungha;Baek, Youngsoon
    • Clean Technology
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    • v.24 no.4
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    • pp.301-306
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    • 2018
  • Recently, due to the increase in the fine dust, regulations on PM generated from diesel cars are strengthened. There is a growing interest in diesel particulate filters (DPFs), a post-treatment device that removes exhaust gases from diesel vehicles. Therefore, one of the enhancements of the DPF efficiency is to reduce the pressure drop in the DPF, thereby increasing the efficiency of the filter and regeneration. In this study, the effect of cell density, channel shape, wall thickness, and inlet channel ratio of 5.66" SiC and Cordierite DPF on the pressure drop in DPF was investigated using ANSYS FLUENT simulator. As a result of the experiment, the pressure drop was smaller at 300 CPSI than 200 CPSI, and the anisotropy and O / S cell showed less than Isotropy by pressure drop of about 1,000 Pa. As the porosity increased by 10% the pressure drop was reduced by about 300 Pa and as the wall thickness increased by 0.05 mm, the pressure drop was increased by about 500 Pa.

Exhaust Emission Characteristics from Heavy-duty Diesel Engine applicable to Prime Propulsion Engine for Marine Vessels (선박 주 추진기관으로 사용가능한 대형 디젤엔진의 배기가스 특성 분석)

  • Lee, Hyung-Min;Park, Rang-Eun
    • Journal of Advanced Marine Engineering and Technology
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    • v.36 no.4
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    • pp.484-489
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    • 2012
  • The objective of this work presented here was focused on analysis of particulate matter and nitrogen oxide characteristics in ESC test mode from heavy-duty diesel engine installed on-road vehicles applicable to prime propulsion engine for marine vessels. The authors confirmed that a large quantity particulate matter were emitted in high power density condition, nitrogen oxide characteristics were dependent on exhaust gas temperature. Particulate matters were reduced by 1/100~1/1,000 times in post DPF with test modes but filtration efficiency was decreased in the engine power fluctuation. In the case of the high speed and power condition, the exhaust level of particulate matters was increased according to increment of temperature of gas flowing into DPF. The orders of magnitude for particle concentration levels from the analysis of size distribution of particulate matters of test engine was different. Both emitting nano-sized particles below 100nm regardless of DPF and non-DPF.

Study of Particle Emission Contour Construction & Characteristics and Reduction Efficiency of Exhaust-Treatment System of Diesel Engine (승용 디젤 엔진의 후처리 시스템 적용에 따른 나노입자 배출 맵 구축 및 저감특성에 관한 연구)

  • Ko, A-Hyun;Hwang, In-Goo;Myung, Cha-Lee;Park, Sim-Soo;Choi, Hoi-Myung
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.34 no.8
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    • pp.755-760
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    • 2010
  • In this study, we mainly focused on the PM (Particulate Matter) emission characteristics of a diesel engine. To analyze particle behavior in the tail-pipe, particle emission was measured on the engine-out (downstream of turbocharger), each upstream and downstream both of DOC (Diesel Oxidation Catalyst) and DPF (Diesel Particulate Filter). Moreover, particle emission contours on each sampling point were constructed. The reduction efficiency of particle number concentration and mass through the DOC and DPF was studied. Parameters such as EGR (Exhaust Gas Recirculation) and the main injection timing were varied in part load conditions and evaluated using the engine-out emissions. The DMS500 (Differential Mobility Spectrometer) was used as a particle measurement instrument that can measure particle concentrations from 5 nm to 1000 nm. Nano-particles of sizes less than 30 nm were reduced by oxidation or coagulated with solid particles in the tail-pipe and DOC. The DPF has a very high filtration efficiency over all operating conditions except during natural regeneration of DPF.

Application of Intake Throttling for Improving Regeneration Characteristics of an Electrical Heated DPE System (소형디젤엔진용 전기히터방식 매연여과장치의 재생특성 향상을 위한 흡기드로틀링 적용연구)

  • Kim Hongsuk;Han Hanseung;Kim Jinhyun;Cho Gyubaek;Jeong Youngil;Hwang Jae-Won;Han Sangmyeong
    • Transactions of the Korean Society of Automotive Engineers
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    • v.13 no.6
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    • pp.77-83
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    • 2005
  • Application of an electric heater is one of attractive methods for active regeneration in DPF systems, but its application has been limited by the capacity of electric power available in vehicles. This study was focused on intake throttling to reduce electrical energy required in the electrical heated DPF system. As results, this study showed the decrease of $30\~50\%$ of intake air mass flow rate and the increase of $20\~60^{\circ}C$ of exhaust gas temperature by the proper control of intake throttling. These intake throttling effects was helpful for regenerable temperature achievement.