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Impact of Selective Catalytic Reduction Process on Nonvolatile Particle Emissions
Technical Paper
2021-01-0624
ISSN: 0148-7191, e-ISSN: 2688-3627
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SAE WCX Digital Summit
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English
Abstract
Particulate matter (PM) and NOX are two major pollutants generated by diesel engines. Modern diesel aftertreatment systems include selective catalytic reduction (SCR) technology that helps reduce tailpipe NOX emissions when coupled with diesel exhaust fluid (DEF/urea) injection. However, this process also results in the formation of urea derived byproducts that can influence non-volatile particle number (PN) measurement conducted in accordance with the European Union (EU) Particle Measurement Program (PMP) protocol. In this program, an experimental investigation of the impact of DEF injection on tailpipe PN and its implications for PMP compliant measurements was conducted using a 2015 model year 6.7 L diesel engine equipped with a diesel oxidation catalyst, diesel particulate filter and SCR system. Open access to the engine controller was available to manually override select parameters. Ammonia-to-NOX (ANR) ratio was varied to understand the impact of urea injection rate on measured PN emissions. In addition, experiments were conducted with and without exhaust gas recirculation. Limited experiments were also conducted to understand the impact of the PN instrument evaporation tube (ET) temperature setpoint on measured PN. Test cycles included the world harmonized transient cycle (WHTC) and world harmonized stationary cycle (WHSC). Tailpipe PN was simultaneously sampled with two PN instruments that were under ISO 17025 calibration in accordance with PMP requirements, but at two different evaporation tube (ET) temperatures of 300 °C and 350 °C. The instrument using the lower ET temperature reported PN emissions on the order of 50% higher or more, although both ET temperatures were in compliance with the standard. The increase was most pronounced when soot concentration was at its lowest level, suggesting that the presence and increase of soot suppressed the formation of urea derived particles. The work also showed urea derived species contributed to PN emissions, even if the ET temperature was set to 350 °C, when compared with no DEF injection. These results highlight the critical impact DEF-derived species could have on tailpipe PN, and how this may or may not be captured under the framework of the existing PMP regulations.
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Citation
Legala, A., Premnath, V., Chadwell, M., Weber, P. et al., "Impact of Selective Catalytic Reduction Process on Nonvolatile Particle Emissions," SAE Technical Paper 2021-01-0624, 2021, https://doi.org/10.4271/2021-01-0624.Data Sets - Support Documents
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References
- Silverman , D.T. , Samanic , C.M. , Lubin , J.H. , Blair , A.E. et al. The Diesel Exhaust in Miners Study: A Nested Case-Control Study of Lung Cancer and Diesel Exhaust Journal of the National Cancer Institute 104 11 855 868 2012 10.1093/jnci/djs034
- Amanatidis , S. , Ntziachristos , L. , Giechaskiel , B. , Bergmann , A. , and Samaras , Z. Impact of Selective Catalytic Reduction on Exhaust Particle Formation over Excess Ammonia Events Environmental Science and Technology 48 19 11527 11534 2014 10.1021/es502895v
- Mamakos , A. , Schwelberger , M. , Fierz , M. , and Giechaskiel , B. Effect of Selective Catalytic Reduction on Exhaust Nonvolatile Particle Emissions of Euro VI Heavy-Duty Compression Ignition Vehicles Aerosol Science and Technology 53 8 898 910 2019 10.1080/02786826.2019.1610153
- Herner , J.D. , Hu , S. , Robertson , W.H. , Huai , T. et al. Effect of Advanced Aftertreatment for PM and NO X Reduction on Heavy-Duty Diesel Engine Ultrafine Particle Emissions Environmental Science and Technology 45 6 2413 2419 2011 10.1021/es102792y
- Khalek , I.A. , Blanks , M.G. , Merritt , P.M. , and Zielinska , B. Regulated and Unregulated Emissions from Modern 2010 Emissions-Compliant Heavy-Duty on-Highway Diesel Engines Journal of the Air and Waste Management Association 65 8 987 1001 2015 10.1080/10962247.2015.1051606
- Khalek , I.A. , Bougher , T.L. , Merritt , P.M. , and Zielinska , B. Regulated and Unregulated Emissions from Highway Heavy-Duty Diesel Engines Complying with U.S. Environmental Protection Agency 2007 Emissions Standards Journal of the Air and Waste Management Association 61 4 427 442 2011 10.3155/1047-3289.61.4.427
- 2019
- Lee , C. , Kwangchul , O. , Kim , D. , and Lee , C. A Characteristic of Particle Number Distribution for the Urea Solution Injection to Urea SCR System of Commercial Diesel Engine for an Emission Regulation SAE Technical Papers 2007-01-3455 2007 https://doi.org/10.4271/2007-01-3455
- Amanatidis , S. , Ntziachristos , L. , Giechaskiel , B. , Bergmann , A. , and Samaras , Z. Impact of Selective Catalytic Reduction on Exhaust Particle Formation over Excess Ammonia Events Environmental Science and Technology 48 19 11527 11534 2014 10.1021/es502895v
- Zhao , Y. , Hu , J. , Hua , L. , Shuai , S. , and Wang , J. Ammonia Storage and Slip in a Urea Selective Catalytic Reduction Catalyst under Steady and Transient Conditions Industrial and Engineering Chemistry Research 50 21 11863 11871 2011 10.1021/ie201045w
- Giechaskiel , B. , Mamakos , A. , Andersson , J. , Dilara , P. et al. Measurement of Automotive Nonvolatile Particle Number Emissions within the European Legislative Framework: A Review Aerosol Science and Technology 46 7 719 749 2012 10.1080/02786826.2012.661103
- Arun Prasath , K. , Bernemyr , H. , and Erlandsson , A. On the Effects of Urea and Water Injection on Particles across the SCR Catalyst in a Heavy - Duty Euro VI Diesel Engine SAE Technical Paper 2020-01-2196 2020 https://doi.org/10.4271/2020-01-2196
- Robinson , M.A. , Backhaus , J. , Foley , R. , and Liu , Z.G. The Effect of Diesel Exhaust Fluid Dosing on Tailpipe Particle Number Emissions SAE Technical Paper 2016-01-0995 2016 https://doi.org/10.4271/2016-01-0995