This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Minimizing Filter Volume by Design Optimization
Technical Paper
2007-01-0657
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
As Diesel Particulate Filter (DPF) applications become widespread, the need for downsizing of filters increases. Indeed, downsizing allows reducing both filter and system costs, facilitates filter integration in the exhaust line close to the engine, and reduces overall system mass and potentially the precious metal loading.
Filter downsizing is mainly limited by filter thermo-mechanical resistance because the system must be capable of storing enough soot before being forced to start filter regeneration in order to limit oil dilution and fuel consumption. The interval between two regenerations depends on filter maximum soot load (MSL) and volume. Thus, it is desired to increase filter MSL in order to keep long regeneration intervals with minimum filter volume. Moreover, in order to maintain acceptable backpressure on a loaded filter, it is required to use optimized cell geometries allowing significant pressure drop reductions.
The current criterion used to define MSL is the appearance of the first crack inside the filter. This criterion is too conservative for recrystallized silicon carbide (RSiC) filters. Indeed, durability and robustness tests performed on RSiC filters show that it is possible to use a higher soot mass than the current MSL without degrading filter functional properties such as filtration efficiency and pressure drop. Therefore, filter downsizing is possible, but it is necessary to reduce filter pressure drop when it is loaded with soot. To do this, cell geometry has been optimized by increasing cell density and reducing wall thickness. Asymmetrical design is also maintained to guarantee good ash storage capacity. This new optimized filter enables a filter volume reduction of 20% while maintaining the same level of performance.
Recommended Content
Authors
Citation
Briot, A., Carranza, F., Girot, P., and Bardon, S., "Minimizing Filter Volume by Design Optimization," SAE Technical Paper 2007-01-0657, 2007, https://doi.org/10.4271/2007-01-0657.Also In
References
- Haralampous O. A. et al “Modeling and experimental study of uncontrolled regeneration in SiC filters with fuel borne catalyst” SAE paper 2004-01-0697
- Pinturaud D. “Etude expérimentale de la régénération partielle” Conference SIA Rouen 29 November 2005
- Bouteiller B. et. al. “One Dimensional Backpressure Model for Asymmetrical Cells DPF” SAE Paper 2007-01-0045
- Bardon S. et. al. “Asymmetrical Channels to Increase DPF Lifetime” SAE Paper 2004-01-0950
- Bouteiller B. “Étude théorique et expérimentale des filtres à particules à substrat céramique pour moteur Diesel - Application à une nouvelle géométrie de cellules” University of Orléans 2006
- Bardon S. «DPF optimization, Robustness and durability» CTI forum in Paris June 2005
- Oxarango L. Institut National Polytechnique de Toulouse 2004
- Konstandopoulos A.G. et. al. “The Optimum Cell Density for Wall-Flow Monolithic Filters: Effects of Filter Permeability, Soot Cake Structure and Ash Loading” SAE Paper 2004-01-1133
- Ranalli et. al. “Soot Loading Distribution as a Key Factor for a Reliable DPF System: an Innovative Development Methodology” SAE Paper 2002-01-2158
- Konstandopoulos, A.G. et. al. “Microstructural Properties of Soot Deposition in Diesel Particulate Traps” SAE Paper 2002-01-1015
- Oxarango L. et al “3-D Macroscopic Model for Fluid Flow and Soot Deposit in Wall Flow Honeycomb DPF” SAE 2003-01-0834