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  1. Article ; Online: A Study on the Impact of DPF Failure on Diesel Vehicles Emissions of Particulate Matter

    Giyoung Park / Saewoong Park / Taewon Hwang / Sangki Oh / Seangwock Lee

    Applied Sciences, Vol 13, Iss 7592, p

    2023  Volume 7592

    Abstract: A diesel particulate filter (DPF) is an after-treatment device designed to capture and store exhaust particulate matter emitted by diesel vehicles. DPFs are damaged owing to complex reasons, such as regeneration processes and loads generated during ... ...

    Abstract A diesel particulate filter (DPF) is an after-treatment device designed to capture and store exhaust particulate matter emitted by diesel vehicles. DPFs are damaged owing to complex reasons, such as regeneration processes and loads generated during driving. While DPFs can be damaged, they can also be manipulated, especially DPFs with hollow damage. In such cases, the filtration performance deteriorates significantly, and excessive amounts of smoke and ash are emitted during driving, resulting in environmental pollution. In this study, DPF damage types were observed using the CR X-ray imaging technique without removing the DPF. In addition, it was experimentally determined that the five types of DPF shapes (normal, crack, melt, plug, and hollow) caused increases in the particle number (PN) and smoke concentration. Experiments were conducted in the Korea Diesel 147 (KD-147) vehicle driving mode, and the PN and smoke concentration were measured using a nanoparticle emission tester 3795 (NPET-3795-HC) and opacimeter (OPA-102). The experiment was conducted 10 times for each type of DPF damage. As a result of the experiment, no significant difference was found between the normal DPF and crack-damaged DPF in terms of smoke emission, but there was a definite difference in the smoke concentration relative to the other DPF damage types. DPF of all damage types satisfied Korea’s smoke concentration regulation. In addition, the PN emission characteristics differed clearly in terms of the values measured for each damage type, and, unlike the smoke concentration characteristics, there was a clear difference in the PN emission characteristics of various DPF damage types. In addition, the PN concentration tended to increase in the rapid acceleration section of the KD-147 vehicle driving mode for all DPF damage types.
    Keywords diesel particulate filter ; particulate matter ; smoke ; CR X-ray ; KD-147 test mode ; Technology ; T ; Engineering (General). Civil engineering (General) ; TA1-2040 ; Biology (General) ; QH301-705.5 ; Physics ; QC1-999 ; Chemistry ; QD1-999
    Subject code 690
    Language English
    Publishing date 2023-06-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  2. Article ; Online: Flow Analysis of PM/NO X Aftertreatment System for Emergency Generator

    Giyoung Park / Hyowon Bang / Seangwock Lee

    Applied Sciences, Vol 12, Iss 4404, p

    2022  Volume 4404

    Abstract: Emergency generators normally use diesel engines. The generators need to conduct weekly no-load operation inspections to ensure stable performance in emergency situations. In particular, the generators with large diesel engines mainly use rectangle-type ... ...

    Abstract Emergency generators normally use diesel engines. The generators need to conduct weekly no-load operation inspections to ensure stable performance in emergency situations. In particular, the generators with large diesel engines mainly use rectangle-type filter substrates. To minimize hazardous emissions generated by generators, optimizing the reduction efficiency through computational fluid dynamics (CFD) analysis of flow characteristics of particulate matter (PM)/NO X reduction system is important. In this study, we analyzed internal flow by CFD, which is difficult to confirm by experimental method. The main factors in our numerical study are the changes of flow uniformity and back pressure. As a result, the flow distribution characteristics according to the cross-sectional shape are similar at high engine loads. Spraying urea in the reverse direction increases static pressure, greatly improving flow uniformity. Raising the selective catalyst reduction (SCR) diffuser angle to 30 degrees improves both back pressure and flow uniformity characteristics, and when the porosity increases, both flow uniformity and back pressure decrease.
    Keywords emergency generator ; aftertreatment system ; CFD (computational fluid dynamics) ; uniformity index ; porosity ; DPF (diesel particulate filter) ; Technology ; T ; Engineering (General). Civil engineering (General) ; TA1-2040 ; Biology (General) ; QH301-705.5 ; Physics ; QC1-999 ; Chemistry ; QD1-999
    Subject code 532 ; 621
    Language English
    Publishing date 2022-04-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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    Inter-library loan at ZB MED

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  3. Article ; Online: A Study on Soot and Ash Accumulation Characteristics of Diesel Particulate Filter Substrate Using Nondestructive Computed Radiography X-ray Imaging Technique

    Giyoung Park / Hoyoung Ryu / Manjae Kwon / Seangwock Lee

    Applied Sciences, Vol 11, Iss 9483, p

    2021  Volume 9483

    Abstract: The diesel particulate filter of a diesel engine is an after-treatment device that removes particulate matter from exhaust emissions by filtering and oxidating them through a regeneration process. When the diesel particulate filter is damaged, a vehicle ... ...

    Abstract The diesel particulate filter of a diesel engine is an after-treatment device that removes particulate matter from exhaust emissions by filtering and oxidating them through a regeneration process. When the diesel particulate filter is damaged, a vehicle inspection is usually performed; if the cause is not found through using on-board diagnostics, then the diesel particulate filter is removed, and a visual test is conducted. However, it is not easy to find the exact cause of the diesel particulate filter being damaged, and a visual test takes a long time as the diesel particulate filter substrate is covered by a canister. In this study, using the computed radiography X-ray imaging technique, X-ray images were taken after placing an accumulated amount of carbon powder, similar to soot and ash powder in the substrate. Results confirmed that carbon powder and ash powder were shown in white in X-ray images, leading to a conclusion that distinguishing between carbon powder and ash powder is possible by analyzing the pixel value through the image processing technique. However, since pixel values alone are insufficient for exact quantitative evaluation, various studies and analyses are necessary for quantitative evaluation.
    Keywords diesel vehicle ; diesel particulate filter (DPF) ; particulate matter (PM) ; soot ; ash ; computed radiography (CR) ; Technology ; T ; Engineering (General). Civil engineering (General) ; TA1-2040 ; Biology (General) ; QH301-705.5 ; Physics ; QC1-999 ; Chemistry ; QD1-999
    Language English
    Publishing date 2021-10-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    Full text online

    More links

    Kategorien

    Inter-library loan at ZB MED

    Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

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