• Title/Summary/Keyword: 매연 여과장치

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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.

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.

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.

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.

A Study on the Characteristics of Pressure Drop and Regeneration of a Porous Seramic Pellet Filter for Diesel Particulate Trap (다공성 세라믹 펠렛을 포집재로 사용하느 매연여과장치의 배압 및 재생 특성에 관한 연구)

  • Kim, Hong-Suk;Cho, Guy-Back;Kim, Jin-Hyun;Jeong, Young-Il;Jeong, In-Su;Park, Jai-Koo
    • 한국연소학회:학술대회논문집
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    • 2003.05a
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    • pp.21-26
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    • 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.

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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 on the PM Oxidation Characteristics of Electrical Heater DPF System (전기히터방식 매연여과장치의 PM 산화 특성에 관한 연구)

  • Ham, Yun-Young;Kim, Dae-Ha;Kim, Kyung-Woon
    • Transactions of the Korean Society of Automotive Engineers
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    • v.14 no.1
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    • pp.183-190
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    • 2006
  • For continuously regenerative PM collecting system which adopted thermally stable SiC DPF and electrical heater which was placed upstream of the filter and driven by well constructed control logic, PM oxidation characteristics were investigated varying air flow rate, amounts of PM accumulated on the DPF and filter inlet temperature in order to get optimized PM regeneration performance. This study showed that the operating condition of air flow rate 70 lpm, high PM loading around 30g and filter inlet temperature $700^{\circ}C$ with heat insulation was effective in achieving high regeneration efficiency. Also, in this condition, we could decrease the electric energy consumption by reducing the regeneration time.