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Influence of Material Properties and Pore Design Parameters on Non-Catalyzed Diesel Particulate Filter Performance with Ash Accumulation
Technical Paper
2012-01-1728
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Diesel particulate filters (DPF) are a common component in emission-control systems of modern clean diesel vehicles. Several DPF materials have been used in various applications. Silicone Carbide (SiC) is common for passenger vehicles because of its thermal robustness derived from its high specific gravity and heat conductivity. However, a segmented structure is required to relieve thermal stress due to SiC's higher coefficient of thermal expansion (CTE). Cordierite (Cd) is a popular material for heavy-duty vehicles. Cordierite which has less mass per given volume, exhibits superior light-off performance, and is also adequate for use in larger monolith structures, due to its lower CTE. SiC and cordierite are recognized as the most prevalent DPF materials since the 2000's.
The DPF traps not only combustible particles (soot) but also incombustible ash. Ash accumulates in the DPF and remains in the filter until being physically removed. Several studies have confirmed that a small amount of ash accumulation in the DPF (until a certain level) improves DPF performance, both in terms of filtration efficiency and sooted back pressure [1, 2, 3, 4]. On the other hand, it has also been confirmed that too much ash accumulation increases exhaust back pressure, leading to a reduction in engine efficiency, as the ash occupies space and plugs the DPF. In some cases, periodic ash cleaning, which requires removal of the DPF from the vehicle, is needed to ensure appropriate DPF performance, especially for heavy-duty diesel vehicles which accumulate high mileage. Thus, accumulation of ash in the DPF is a common and considerable issue for long-term vehicle operation, regardless of the filter material. Improved understanding of the phenomena of ash accumulation in the DPF is valuable for further improvement of the emission-control system.
In this study, four different non-catalyzed DPF materials (three different porosities and two different pore sizes) of rectangular configuration 38mm × 38mm × 152mm, made of SiC were subjected to accelerated ash loading. In addition, a non-catalyzed cordierite DPF was also evaluated to determine the influence of the DPF material. Ash loading at five different levels from 0 to 20 g/L was conducted. Twenty five ashed DPF samples in total were prepared for this investigation. The DPF back pressure response to soot loading was verified by a soot generator for all samples. The phenomenon of ash accumulation and its effects on the sooted DPF back pressure response was investigated, resulting in the formulation of DPF design criteria to reduce ash-related impact on lifetime DPF performance.
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Authors
- Iason Dimou - Massachusetts Institute of Technology
- Alexander Sappok - Massachusetts Institute of Technology
- Victor Wong - Massachusetts Institute of Technology
- Shuji Fujii - NGK Automotive Ceramics USA
- Hirofumi Sakamoto - NGK Insulators Ltd
- Kazuya Yuuki - NGK Insulators Ltd
- Claus Dieter Vogt - NGK Insulators, Ltd.
Citation
Dimou, I., Sappok, A., Wong, V., Fujii, S. et al., "Influence of Material Properties and Pore Design Parameters on Non-Catalyzed Diesel Particulate Filter Performance with Ash Accumulation," SAE Technical Paper 2012-01-1728, 2012, https://doi.org/10.4271/2012-01-1728.Also In
References
- Aravelli, K. and Heibel, A., “Improved Lifetime Pressure Drop Management for Robust Cordierite (RC) Filters with Asymmetric Cell Technology (ACT),” SAE Technical Paper 2007-01-0920, 2007, doi:10.4271/2007-01-0920.
- Fujii, S. and Asako, T., “Development of Artificial Ash Accelerated Accumulation Test Method,” SAE Technical Paper 2010-01-2171, 2010, doi:10.4271/2010-01-2171.
- Sappok, A., Santiago, M., Vianna, T., and Wong, V., “Characteristics and Effects of Ash Accumulation on Diesel Particulate Filter Performance: Rapidly Aged and Field Aged Results,” SAE Technical Paper 2009-01-1086, 2009, doi:10.4271/2009-01-1086.
- Fujii, S. and Asako, T., “Design Optimization of Non-Catalyzed DPF from Viewpoint of Back Pressure in Ash loading State,” SAE Technical Paper 2011-01-2091, 2011, doi:10.4271/2011-01-2091.
- Ingram-Ogunwumi, R., Dong, Q., Murrin, T., Bhargava, R. et al., “Performance Evaluations of Aluminum Titanate Diesel Particulate Filters,” SAE Technical Paper 2007-01-0656, 2007, doi:10.4271/2007-01-0656.
- Boger, T., Jamison, J., Warkins, J., Golomb, N. et al., “Next Generation Aluminum Titanate Filter for Light Duty Diesel Applications,” SAE Technical Paper 2011-01-0816, 2011, doi:10.4271/2011-01-0816.
- Majkowski, S., “Value Analysis of Alternative Diesel Particulate Filter (DPF) Substrates for Future Diesel Aftertreatment System”, 2009 DEER Conference, 2009.
- Mikulic, I., Zhan, R., and Eakle, S., “Dependence of Fuel Consumption on Engine Backpressure Generated by a DPF,” SAE Technical Paper 2010-01-0535, 2010, doi:10.4271/2010-01-0535.
- Malanga, M., Martin, S.J., Ziebarth, R., Pyzik, A., Han, C., “Tailored Acicular Mullite Substrates for Multifunctional Diesel Particulate Filters”, 2009 DEER Conference, 2009.
- Wolff, T., Friedrich, H., Johannesen, L., and Hajireza, S., “A New Approach to Design High Porosity Silicon Carbide Substrates,” SAE Technical Paper 2010-01-0539, 2010, doi:10.4271/2010-01-0539.
- Regulation, Commission Regulation (EC) No 692/2008 of 18 July 2008.
- Tan, J., Solbrig, C., and Schmieg, S., “The Development of Advanced 2-Way SCR/DPF Systems to Meet Future Heavy-Duty Diesel Emissions,” SAE Technical Paper 2011-01-1140, 2011, doi:10.4271/2011-01-1140.
- Cavataio, G., Girard, J., and Lambert, C., “Cu/Zeolite SCR on High Porosity Filters: Laboratory and Engine Performance Evaluations,” SAE Technical Paper 2009-01-0897, 2009, doi:10.4271/2009-01-0897.
- Kimura, K., Lynskey, M., Corrigan, E., Hickman, D. et al., “Real World Study of Diesel Particulate Filter Ash Accumulation in Heavy-Duty Diesel Trucks,” SAE Technical Paper 2006-01-3257, 2006, doi:10.4271/2006-01-3257.
- McGeehan, J., Yeh, S., Rutherford, J., Couch, M. et al., “Analysis of DPF Incombustible Materials from Volvo Trucks Using DPF-SCR-Urea With API CJ-4 and API CI-4 PLUS Oils,” SAE Int. J. Fuels Lubr. 2(1):762-780, 2009, doi:10.4271/2009-01-1781.
- Williams, A., McCormick, R., Luecke, J., Brezny, R. et al., “Impact of Biodiesel Impurities on the Performance and Durability of DOC, DPF and SCR Technologies,” SAE Int. J. Fuels Lubr. 4(1):110-124, 2011, doi:10.4271/2011-01-1136.
- Bodek, K. and Wong, V., “The Effects of Sulfated Ash, Phosphorus and Sulfur on Diesel Aftertreatment Systems - A Review,” SAE Technical Paper 2007-01-1922, 2007, doi:10.4271/2007-01-1922.
- Youngquist, A., Nguyen, K., Bunting, B., and Toops, T., “Development of an Accelerated Ash Loading Protocol for Diesel Particulate Filters,” SAE Technical Paper 2008-01-2496, 2008, doi:10.4271/2008-01-2496.
- Takeuchi, Y., Hirano, S., Kanauchi, M., Ohkubo, H. et al., “The Impact of Diesel Engine Lubricants on Deposit Formation in Diesel Particulate Filters,” SAE Technical Paper 2003-01-1870, 2003, doi:10.4271/2003-01-1870.
- Manni, M., Pedicillo, A., and Bazzano, F., “A Study of Lubricating Oil Impact on Diesel Particulate Filters by Means of Accelerated Engine Tests,” SAE Technical Paper 2006-01-3416, 2006, doi:10.4271/2006-01-3416.
- Manni, M., Pedicillo, A., Del Piero, G., and Previde Massara, E., “An Experimental Evaluation of the Impact of Lubricating Oils and Fuels on Diesel Particulate Filters,” SAE Technical Paper 2007-01-1925, 2007, doi:10.4271/2007-01-1925.
- Sappok, A., Wong, V., “Lubricant-Derived Ash Properties and Their Effects on Diesel Particulate Filter Pressure Drop Performance”, ICEF2009-140880, 2009.
- Ishizawa, T., Yamane, H., Satoh, H., Sekiguchi, K. et al., “Investigation into Ash Loading and Its Relationship to DPF Regeneration Method,” SAE Int. J. Commer. Veh. 2(2):164-175, 2010, doi:10.4271/2009-01-2882.
- Sappok, A., Beauboeuf, D., and Wong, V., “A Novel Accelerated Aging System to Study Lubricant Additive Effects on Diesel Aftertreatment System Degradation,” SAE Int. J. Fuels Lubr. 1(1):813-827, 2009, doi:10.4271/2008-01-1549.
- Majewski, W., DieselNet Technology Guide, Diesel Particulate Matter, “What Are Diesel Particulates”, http://www.dieselnet.com/tech/dpm.html
- Sappok, A., Kamp, C., and Wong, V., “Sensitivity Analysis of Ash Packing and Distribution in Diesel Particulate Filters to Transient Changes in Exhaust Conditions,” SAE Int. J. Fuels Lubr. 5(2):733-750, 2012, doi:10.4271/2012-01-1093.
- Kamp, C., Sappok, A., and Wong, V., “Soot and Ash Deposition Characteristics at the Catalyst-Substrate Interface and Intra-Layer Interactions in Aged Diesel Particulate Filters Illustrated using Focused Ion Beam (FIB) Milling,” SAE Int. J. Fuels Lubr. 5(2):696-710, 2012, doi:10.4271/2012-01-0836.
- Fujii, S., Asako, T., and Yuuki, K., “Studies of Diesel Particulate Filter Performances by a Diesel Engine Simulator,” SAE Technical Paper 2010-01-0813, 2010, doi:10.4271/2010-01-0813.
- Merkel, G., Tao, T., Culter, W., Chiffey, A., Phillips, P., Walker, A., “New Cordierite Diesel Particulate Filters for Catalyzed and Non-Catalyzed Application”, 2003 DEER Conference, 2003.
- Gaiser, G. and Mucha, P., “Prediction of Pressure Drop in Diesel Particulate Filters Considering Ash Deposit and Partial Regenerations,” SAE Technical Paper 2004-01-0158, 2004, doi:10.4271/2004-01-0158.
- Heibel, A. and Bhargava, R., “Advanced Diesel Particulate Filter Design for Lifetime Pressure Drop Solution in Light Duty Applications,” SAE Technical Paper 2007-01-0042, 2007, doi:10.4271/2007-01-0042.
- Konstandopoulos, A., Skaperdas, E., and Masoudi, M., “Microstructural Properties of Soot Deposits in Diesel Particulate Traps,” SAE Technical Paper 2002-01-1015, 2002, doi:10.4271/2002-01-1015.
- Koltsakis, G., Konstantinou, A., Haralampous, O., and Samaras, Z., “Measurement and Intra-Layer Modeling of Soot Density and Permeability in Wall-flow Filters,” SAE Technical Paper 2006-01-0261, 2006, doi:10.4271/2006-01-0261.