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Study on Wall Pore Structure for Next Generation Diesel Particulate Filter
Technical Paper
2008-01-0618
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
A wall flow diesel particulate filter (DPF) having a novel wall pore structure design for reducing backpressure, increasing robustness, and increasing filtration efficiency is presented. The filter offers a linear relationship between soot loading and backpressure, offering greater accuracy in estimating the amount of soot loading from backpressure. Basic experiments were performed on small plate test pieces having various pore structure designs. Soot generated by a Cast-2F propane burner having a controlled size distribution was used. Cold flow test equipment that was carefully designed for flow distribution and soot/air mixing was used for precise measurement of backpressure during soot loading. The upstream and downstream PM numbers were counted by Scanning Mobility Particle Sizer (SMPS) to determine soot concentration in the gas flow and filtration efficiency of the test pieces. Microscope observations of the soot trapped in the wall were also carried out. A dual-layer pore structure in which the gas inflow side of the wall is given a filtration layer having small pores and a high porosity (void ratio) was demonstrated to drastically improve the filtration efficiency, drastically reduce the backpressure with Particulate Matter (PM) accumulation, as well as provide a linear relationship between soot loading and backpressure. This structure allows the porosity of the both body components to be independently chosen because filtration and backpressure are not easily affected by the pore structure of the wall bodies, making the structure suitable for both robustness-oriented and continuous-regeneration oriented applications.
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Authors
- Yukio Mizuno - NGK Insulators, Ltd.
- Yukio Miyairi - NGK Insulators, Ltd.
- Fumio Katsube - NGK Insulators, Ltd.
- Etsuji Ohara - NGK Insulators, Ltd.
- Akira Takahashi - NGK Insulators, Ltd.
- Mikio Makino - NGK Insulators, Ltd.
- Takashi Mizutani - NGK Insulators, Ltd.
- Kazuya Yuki - NGK Insulators, Ltd.
- Hiroshi Kurachi - NGK Insulators, Ltd.
Topic
Citation
Mizuno, Y., Miyairi, Y., Katsube, F., Ohara, E. et al., "Study on Wall Pore Structure for Next Generation Diesel Particulate Filter," SAE Technical Paper 2008-01-0618, 2008, https://doi.org/10.4271/2008-01-0618.Also In
References
- Kolsakis Grigoris V et.al. “Design and application of Catalyzed metal Form Particulate Filtaers” SAE 2006-01-3284
- Kuki et.al. “Study on Reliability of Wall-Flow Type Diesel Particulate Filter” SAE 2004-01-0959
- Yamaguchi S. Fujii S. et.al. “Design Optimization of Wall-Flow-Type Catalyzed Cordierite Particulate Filter for Heavy-Duty Diesel” SAE 2005-01-0666
- Hashimoto S. et.al. “Sic and Cordierite Diesel Particulate Filters Designed for Low Pressure Drop and Catalyzed, Uncatalyzed Systems” SAE 2002-01-0322
- Ohara E. Mizuno Y. et.al. “Filtration Behavior of Diesel Particulate Filters (1)” SAE 2007-01-0921
- Mizutani T. et.al. “Filtration Behavior of Diesel Particulate Filters (2)” SAE 2007-01-0923