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Effects of Fuel Aromatics, Cetane Number, and Cetane Improver on Emissions from a 1991 Prototype Heavy-Duty Diesel Engine
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Abstract
Several diesel fuel properties have been identified as having significant effects on diesel engine emissions. For heavy-duty diesel engines, fuel properties of aromatics, back end volatility (represented by the 90 percent boiling point), and sulfur were examined in a previous CRC VE-1 study in which reductions in all three properties decreased regulated emissions to varying degrees. Aromatic levels and cetane numbers were generally correlated in the previous study, so variation in emissions due to “aromatics” could not clearly be assigned to variation in aromatic levels alone. To separate the effects of aromatics and cetane number, a fuel set with controlled variation in aromatics and cetane number was developed, including the use of ignition improver to increase the cetane number of selected fuels.
The fuel set was used in a 1991 Prototype DDC Series 60 heavy-duty diesel engine to examine regulated emissions over EPA transient cycle operation. Results indicate that cetane number was the key fuel property affecting transient HC and CO emissions. In addition, cetane number was the principal fuel property affecting composite particulate emissions, but aromatic effects were also significant. For emissions of NOx, both cetane number and aromatics were significant for transient emissions.
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Ullman, T., Mason, R., and Montalvo, D., "Effects of Fuel Aromatics, Cetane Number, and Cetane Improver on Emissions from a 1991 Prototype Heavy-Duty Diesel Engine," SAE Technical Paper 902171, 1990, https://doi.org/10.4271/902171.Also In
References
- CRC APRAC “Status Report,” Coordinating Research Council, Inc. 219 Perimeter Center Parkway, Atlanta, Georgia 30346 January 1988
- Ullman, T.L. “Investigation of the Effects of Fuel Composition, and Injection and Combustion System Type on Heavy-Duty Diesel Exhaust Emissions,” Coordinating Research Council March 1989
- Ullman, T.L. “Investigation of the Effects of Fuel Composition on Heavy-Duty Diesel Engine Emissions,” SAE Paper 892072 International Fuels and Lubricants Meeting & Exposition Baltimore, Maryland September 25-28 1989
- Ullman, T.L. Mason, R.L. Montalvo, D.A. “Study of Fuel Cetane Number and Aromatic Content Effects on Regulated Emissions from a Heavy-Duty Diesel Engine,” Coordinating Research Council, Inc. September 1990
- California Code of Regulations “Aromatic Content of Diesel Fuel,” April 17 1989
- “Emission Regulations for New Gasoline-and Diesel-fueled Heavy-Duty Engines; Gaseous Exhaust Test Procedures,” Environmental Protection Agency