Effects of fuel aromatics, cetane number, and cetane improver on emissions from a 1991 prototype heavy-duty diesel engine

Conference · Mon Jan 01 04:00:00 EST 1990

OSTI ID:5556239

Ullman, T L; Mason, R L; Montalvo, D A

Several diesel identified as having significant effects on diesel engine emissions. This paper reports, for heavy-duty diesel engines, fuel properties of aromatics, back end volatility (represented by the 90 percent boiling point), and sulfur 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 NO{sub x} both cetane number and aromatics were significant for transient emissions.

• OSTI ID: 5556239
• Report Number(s): CONF-9010205--
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330102* -- Internal Combustion Engines-- Diesel
330701 -- Emission Control-- Nitrogen Oxides
330702 -- Emission Control-- Carbon Monoxide
330704 -- Emission Control-- Hydrocarbons
ANTIKNOCK RATINGS
AROMATICS
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CHALCOGENIDES
CHEMICAL PROPERTIES
DIESEL ENGINES
DIESEL FUELS
ELEMENTS
EMISSION
ENGINES
FUELS
HEAT ENGINES
HYDROCARBONS
IGNITION
INTERNAL COMBUSTION ENGINES
NATIONAL ORGANIZATIONS
NITROGEN COMPOUNDS
NITROGEN OXIDES
NONMETALS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PETROLEUM PRODUCTS
SULFUR
US EPA
US ORGANIZATIONS