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A Dual - Reductant HC LNC Approach to Commercial Vehicle Tier 4 Final Solutions
ISSN: 0148-7191, e-ISSN: 2688-3627
Published September 13, 2011 by SAE International in United States
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Stringent global emissions legislations demand effective NOx reduction strategies for both the engine as well as the aftertreatment. Diesel applications have previously applied Lean NOx Catalysts (LNCs) [1, 2], but their reduction efficiency and longevity have been far less than that of the competing ammonia-based SCR systems, such as urea . A catalyst has been developed to significantly reduce NOx emissions, approaching 60% with ULSD and exceeding 95% with E85. Both thermal and sulfur aging are applied, as well as on-engine aging, illustrating resilient performance to accommodate necessary life requirements. A robust system is developed to introduce both ULSD from the vehicle's tank as well as E85 (up to 85% ethanol with the balance being gasoline) from a moderately sized supplemental tank, enabling extended mileage service intervals to replenish the reductant, as compared with urea, particularly when coupled with an engine-out based NOx reduction technology, such as EGR. The highly efficient E85 is applied when engine-out NOx conditions are at their highest, and in other less polluting regions the ULSD is leveraged for moderate reductions, ensuring Not-to-Exceed (NTE) requirements are achieved, of course. Results illustrate the ability to extend reductant refill intervals, while keeping the E85 reductant tank volume to less than that necessary with urea. Additional benefits of E85 in the system design are described, including improved evaporation, deposit avoidance, simplified freeze-thaw strategies, and existing reductant infrastructure and availability. Low temperature management is accommodated through the integration of a thermal regenerator, which provides heat necessary for DPF regeneration as well as catalyst activation and desulfation. Temperature sensitivities of the catalyst are compared, evaluating fuel and reductant consumption effects, particularly as engine-out NOx concentrations and exhaust temperatures change. In conclusion, the system is applied to a Tier 3 off-road tractor, demonstrating not only Tier 4 Final compliance, but significant additional reductions.
- Gabriel Salanta - Tenneco, Inc.
- Adam Kotrba - Tenneco, Inc.
- John Nunan - Umicore, Inc.
- Jason Jacques - Umicore, Inc.
- Dan Hancu - General Electric, Inc.
- Benjamin Winkler - General Electric, Inc.
- Daniel Norton - General Electric, Inc.
- Larry Lewis - General Electric, Inc.
- Ashish Mhadeshwar - General Electric, Inc.
CitationSalanta, G., Kotrba, A., Nunan, J., Jacques, J. et al., "A Dual - Reductant HC LNC Approach to Commercial Vehicle Tier 4 Final Solutions," SAE Technical Paper 2011-01-2203, 2011, https://doi.org/10.4271/2011-01-2203.
- Eränen, K. Lindfors, L-E. Niemi, A. Elfving, P. Cider, L. “Influence of Hydrocarbons on the Selective Catalytic Reduction of NOx over Ag/Al2O3-Laboratory and Engine Tests,” SAE Technical Paper 2000-01-2813 2000 10.4271/2000-01-2813
- Schmieg, S. J. Blint, R. J. Deng, L. “Control Strategy for the Removal of NOx from Diesel Engine Exhaust using Hydrocarbon Selective Catalytic Reduction,” SAE Technical Paper 2008-01-2486 2008 10.4271/2008-01-2486
- Lambert, C. Hammerle, R. McGill, R. Khair, M. Sharp, C. “Technical Advantages of Urea SCR for Light-Duty and Heavy-Duty Diesel Vehicle Applications,” SAE Technical Paper 2004-01-1292 2004 10.4271/2004-01-1292
- Emission Standards: USA HD Diesel Engines http:/www.dieselnet.com/standards/us/hd.php
- Floyd, R. Kotrba, A. Martin, S. Prodin, K. “Material Corrosion Investigations for Urea SCR Diesel Exhaust Systems,” SAE Technical Paper 2009-01-2883 2009 10.4271/2009-01-2883
- Zheng, G. Fila, A. Kotrba, A. Floyd, R. “Investigation of Urea Deposits in Urea SCR Systems for Medium and Heavy Duty Trucks,” SAE Technical Paper 2010-01-1941 2010 10.4271/2010-01-1941
- DiMaggio, C. L. Fisher, G. B. Rahmoeller, K. M. Sellnau, M. “Dual SCR Aftertreatment for Lean NOx Reduction,” SAE Int. J. Fuels Lubr. 2 1 66 77 2009 10.4271/2009-01-0277
- Mhadeshwar, A. Norton, D. Deluga, G. Hancu, D. 2008 Integrated System-Level Modeling for Diesel-Based NOx Aftertreatment Spring 2008 ACS National Meeting
- Mhadeshwar, A. Winkler, B. Eiteneer, B. Hancu, D. 2009 Microkinetic Modeling for Hydrocarbon (HC)-based selective catalytic reduction (SCR) of NOx on a silver-based catalyst Applied Catalysis B: Environmental 229 238
- Zuzaniuk, V. Meunier, F. Ross, J. 2001 Differences in the Reactivity of Organo-Nitro and Nitrito Compounds over Al2O3-Based Catalysts Active for the Selective Reduction of NOx Journal of Catalysis 340 353
- Mhadeshwar, A. Norton, D. Buddle, S. Winkler, B. Hancu, D. Demidyuk, V. et al. 2010 Catalytic Deactivation for Hydrocarbon-based Selective Catalytic Reduction of NOx 21st Canadian Symposium on Catalysis
- Zheng, G. Palmer, G. Salanta, G. Kotrba, A. “Mixer Development for Urea SCR Applications,” SAE Technical Paper 2009-01-2879 2009 10.4271/2009-01-2879
- Sampeth, M. Zheng, G. Kotrba, A. “Integration of Diesel Burner for Large Engine Aftertreatment using CFD,” SAE Technical Paper 2010-01-1946 2010 10.4271/2010-01-1946
- Akiyoshi, T. Torisaka, H. Yokta, H. Shimizu, T. “Development of Efficient Urea-SCR Systems for EPA 2010-Compliant Medium Duty Diesel Vehicles,” SAE Technical Paper 2011-01-1309 2011 10.4271/2011-01-1309
- Gardner, T. Yetkin, A. Shotwell, R. Kotrba, A. “Evaluation of a DPF Regeneration System and DOC Performance Using Secondary Fuel Injection,” SAE Technical Paper 2009-01-2884 2009 10.4271/2009-01-2884
- Majewski, A.W. Khair, M.K. 2006 ‘Diesel Emissions and Their Control’ 177
- Kotrba, A. Bai, L. Yetkin, A. Shotwell, R. et al. “DPF Regeneration Response : Coupling Various DPFs with a Thermal Regeneration Unit to Assess System Behaviors,” SAE Technical Paper 2011-01-2200 2011 10.4271/2011-01-2200
- Naseri, M. Chatterjee, S. Castagnola, M. Chen, H-Y. et al. “Development of SCR on Diesel Particulate Filter System for Heavy Duty Applications,” SAE Technical Paper 2011-01-1312 2011 10.4271/2011-01-1312