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Soot Emission Reduction from Post Injection Strategies in a High Pressure Direct-Injection Natural Gas Engine
Technical Paper
2013-24-0114
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Compression ignition engines, including those that use natural gas as the major fuel, produce emissions of NOx and particulate matter (PM). Westport Inc. has developed the pilot-ignited high-pressure direct-injection (HPDI) natural gas engine system. Although HPDI engines produce less soot than comparable conventional diesel engines, further reductions in engine-out soot emissions is desired. In diesel engines, multiple injections can help reduce both NOx and PM. The effect of post injections on HPDI engines was not studied previously. The present research shows that late injection of a second gas pulse can significantly reduce PM and CO from HPDI engines without significantly increasing NOx or fuel consumption. In-cylinder pressure measurements were used to characterize the heat release resulting from the multiple injections. Experiments showed that most close-coupled split injection strategies provided no significant emissions benefit and less stable operation. However, post injection of 15-20% of the fuel 1.5-2.5 ms after the end of the first injection can reduce PM and CO by over 80%. Using this strategy has only a small effect on other emissions and fuel consumption. Methane emission is reduced about 25%, NOx changes is almost within the variability of results, maximum pressure of cylinder increases within 5bar and fuel consumption will increase about 1%. Based on the literature for diesel engines, we expect that enhanced mixing due to the second injection and increased local temperature within the cylinder may be major contributors to the soot reductions.
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Faghani, E., Patychuk, B., McTaggart-Cowan, G., and Rogak, S., "Soot Emission Reduction from Post Injection Strategies in a High Pressure Direct-Injection Natural Gas Engine," SAE Technical Paper 2013-24-0114, 2013, https://doi.org/10.4271/2013-24-0114.Also In
References
- McTaggart-Cowan , G. Pollutant Formation in a Gaseous-Fuelled, Direct Injection Engine Ph.D. Thesis University of British Columbia 2006
- Ouellette , P. , Douville , B. H. P. , and Ursu , B. NOx Reduction in a directly injected natural gas engine Proceedings of the 1998 Fall Technical Conference of the ASME, IC Engines Division. ICE 31-3 Clymer, NY Sept. 1998
- Harrington , J. , Munshi , S. , Nedelcu , C. , Ouellette , P. et al. Direct Injection of Natural Gas in a Heavy-Duty Diesel Engine SAE Technical Paper 2002-01-1630 2002 10.4271/2002-01-1630
- Jones , H. , McTaggart-Cowan , G. , Rogak , S. , Bushe , W. et al. Source Apportionment of Particulate Matter from a Diesel Pilot-Ignited Natural Gas Fuelled Heavy Duty DI Engine SAE Technical Paper 2005-01-2149 2005 10.4271/2005-01-2149
- Bobba , M. , Musculus , M. , and Neel , W. Effect of Post Injections on In-Cylinder and Exhaust Soot for Low-Temperature Combustion in a Heavy-Duty Diesel Engine SAE Int. J. Engines 3 1 496 516 2010 10.4271/2010-01-0612
- Han , Z. , Uludogan , A. , Hampson , G. , and Reitz , R. Mechanism of Soot and NOx Emission Reduction Using Multiple-injection in a Diesel Engine SAE Technical Paper 960633 1996 10.4271/960633
- Desantes , J. , Arrègle , J. , López , J. , and García , A. A Comprehensive Study of Diesel Combustion and Emissions with Post-injection SAE Technical Paper 2007-01-0915 2007 10.4271/2007-01-0915
- O'Connor , J. and Musculus , M. Post Injections for Soot Reduction in Diesel Engines: A Review of Current Understanding SAE Int. J. Engines 6 1 400 421 2013 10.4271/2013-01-0917
- Munshi , S. R. , McTaggart-Cowan , G. P. , Huang , J. , Hill , P. G. Development of a Partially-Premixed Combustion Strategy for a Low-Emission, Direct Injection High Efficiency Natural Gas Engine Proceedings of the ASME 2011 Internal Combustion Engine Division Fall Technical Conference, ICEF2011 October 2 5 2011 Morgantown, West Virginia, USA
- Heywood , J. Internal Combustion Engine Fundamentals McGraw-Hill 1988
- Brown , B. S. High-pressure direct-injection of natural gas with entrained diesel into a compression-ignition engine M.Sc. Thesis University of British Columbia 2008
- Gilbert , M. S. , and Clark , N. N. Measurement of particulate matter from diesel engine exhaust using a tapered element oscillating microbalance International Journal of Engine Research 2 4 277 287 2001
- Cheung , S. , Elder , S. , and Raine , R. Diesel Particulate Measurements with a Light Scattering Photometer SAE Technical Paper 2000-01-1136 2000 10.4271/2000-01-1136
- Patychuk , B. , and Rogak , S. Particulate Matter Emission Characterization from a Natural Gas Fuelled High Pressure Direct Injection Engine Proceedings of the ASME 2012 Internal Combustion Engine Division Fall Technical Conference, ICEF2012 September 23 26 2012 Vancouver, BC, Canada 2012
- Matti Maricq , M. Monitoring Motor Vehicle PM Emissions: An Evaluation of Three Portable Low-Cost Aerosol Instruments Aerosol Science and Technology 47 564 573 2013
- McTaggart-Cowan , G. , Mann , K. , Huang , J. , Wu , N et al Particulate Matter Reduction From a Pilot-Ignited, Direct Injection of Natural Gas Engine Proceedings of the ASME 2012 Internal Combustion Engine Division Fall Technical Conference, ICEF2012 September 23 26 2012 Vancouver, BC, Canada 2012