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Investigation into Ash from Field Returned DPF Units: Composition, Distribution, Cleaning Ability and DPF Performance Recovery
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 05, 2016 by SAE International in United States
Annotation ability available
Ash accumulation in the DPF over life results in reduced soot storage capacity, lower catalytic activity and may even alter substrate properties and lead to higher back-pressure; hence ash-cleaning of the DPF is required periodically to extend the life of the DPF and restore its catalytic performance.
Several ash cleaning technologies are available which utilize pneumatic, hydraulic and wet-chemical cleaning techniques or their combinations. A batch of DPFs with various ash accumulation levels were recovered from customer field units. X-ray CT imaging was performed to understand the ash distribution in the DPF channels. Field returned DPFs were tested on Engine Dynamometer to determine the impact on overall system performance loss from fresh state. The DPFs were then cleaned using various cleaning techniques; X-ray imaging and dynamometer testing was repeated to evaluate the performance recovery. Ash samples retrieved from cleaning were analyzed using ICP-OES to determine ash composition and source of origin; they were correlated to DPF operating history.
It was found that lube oil consumption rate and the engine-oil SAPS (Sulfated Ash, Phosphorous, Sulfur) levels were the primary drivers for ash accumulation rates. Ash tends to collect at the channel end plugs in applications that require frequent active regeneration and tends to accumulate as a thin layer on the DPF wall with applications that are more dependent on passive regenerations. On DPFs that had higher regeneration frequency due to more severe cycles, the ash had a tendency to form bridges on the substrates and permanently sinter with the washcoat interface thereby leading to reduced area available for catalytic activity. The cleaning techniques evaluated were quite effective; however they have to be selected based on the ash loading characteristics in the DPF. Improvements in back-pressure, HC light-off and soot storage capacities were quantified for various cleaning techniques.
CitationBagi, S., Singh, N., and Andrew, R., "Investigation into Ash from Field Returned DPF Units: Composition, Distribution, Cleaning Ability and DPF Performance Recovery," SAE Technical Paper 2016-01-0928, 2016, https://doi.org/10.4271/2016-01-0928.
- Kotrba , A. , Gardner , T. , Bai , L. , and Yetkin , A. Passive Regeneration Response Characteristics of a DPF System SAE Technical Paper 2013-01-0520 2013 10.4271/2013-01-0520
- Morcos , M. , Ayyappan , P. , and Harris , T. Characterization of DPF Ash for Development of DPF Regeneration Control and Ash Cleaning Requirements SAE Technical Paper 2011-01-1248 2011 10.4271/2011-01-1248
- McGeehan , J. , Van Dam , W. , Narasaki , K. , Boffa , A. et al. Extending the Boundaries of Diesel Particulate Filter Maintenance With Ultra-Low Ash - Zero-Phosphorus Oil SAE Int. J. Fuels Lubr. 5 3 1240 1263 2012 10.4271/2012-01-1709
- Watson , S. , Huang , W. , and Wong , V. Correlations among Ash-Related Oil Species in the Power Cylinder, Crankcase and the Exhaust Stream of a Heavy-Duty Diesel Engine SAE Technical Paper 2007-01-1965 2007 10.4271/2007-01-1965
- Bardasz , E. , Cowling , S. , Panesar , A. , Durham , J. et al. Effects of Lubricant Derived Chemistries on Performance of the Catalyzed Diesel Particulate Filters SAE Technical Paper 2005-01-2168 2005 10.4271/2005-01-2168
- Piesche , M. , Bargende , M. , Deuschle , T. , Hitzler , G. , Janoske , U. , and Weitk , W. 2003 Langzeitstabilität von Partikelfiltern in Dieselmotoren FVV Heft R521 Informationstagung Motoren, FVV Frankfurt
- Sappok , A. and Wong , V. Detailed Chemical and Physical Characterization of Ash Species in Diesel Exhaust Entering Aftertreatment Systems SAE Technical Paper 2007-01-0318 2007 10.4271/2007-01-0318
- 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 10.4271/2006-01-3257
- 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 10.4271/2007-01-0920
- Najman , Morey et al. Combination of ashless antiwear additives with metallic detergents: interactions with neutral and overbased calcium sulfonates Tribology International 39.4 2006 342 355
- Topolovec-Miklozic , Ksenija , T. Reg Forbus , and Hugh Spikes Film forming and friction properties of overbased calcium sulphonate detergents Tribology Letters 29.1 2008 33 44
- Rizvi , Syed QA 4 Detergents Lubricant Additives: Chemistry and Applications 2009 123
- Galisteo F. Cabello et al. Deactivation on vehicle aged DOC, Topics in Catalysis 30/31 1022 5528 July 2004
- Kröger , Virpi Poisoning of Automotive Exhaust Gas Catalyst Components Process and Environmental Engineering University of Oulu Oulu, Finland 2007
- Angove, Dennys E. , and Cant Noel W. Position dependent phenomena during deactivation of three-way catalytic converters on vehicles Catalysis today 63.2 2000 371 378
- 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 10.4271/2012-01-1093
- 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 10.4271/2004-01-0158
- Hubbard , Camden R. , Evans E. H. , and Smith D. K. The reference intensity ratio, I/Ic, for computer simulated powder patterns Journal of Applied Crystallography 9.2 1976 169 174
- 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 10.4271/2009-01-1086
- Burrows , A. , Korosec , P. , and Malfer , D. FORMULATION OF LOWER PHOSPHORUS PASSENGER CAR OILS SAE Technical Paper 860373 1986 10.4271/860373
- Inoue ,, K. , Kurahashi ,, T. , Negishi , T. , Akiyama ,, K. et al. Effects of Phosphorus and Ash Contents of Engine Oils on Deactivation of Monolithic Three-Way Catalysts and Oxygen Sensors SAE Technical Paper 920654 1992 10.4271/920654
- 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 10.4271/2009-01-2882
- Bagi , S. , Bowker , R. , and Andrew , R. Understanding Chemical Composition & Phase Transitions of Ash from Field Returned DPF Units and their Correlation with Filter Operating Conditions SAE Technical Paper 2016-01-0898 2016