Fuel, lubricant and additive effects in combustion chamber deposit formation

Conference · Tue Oct 01 04:00:00 EDT 1996

OSTI ID:370722

Kelemen, S R; Homan, H S ^[1]

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1. Exxon Research and Engineering Company, Annandale, NJ (United States)

CCD causes octane requirement increase (ORI) and can potentially contributes to exhaust emissions and combustion chamber deposit interference (CCDI). Experiments were conducted to identify the separate fuel, lubricant and additive contributions to the amount and composition of CCD. CCD originates from multiple sources. Gasoline hydrocarbon components, gasoline additives, engine lubricant, and atmospheric nitrogen contribute to CCD in different ways. With some fuels the engine lubricant is the main contributor to CCD and this is shown by the high ash level in the CCD. For other fuels CCD is predominantly organic. Significant amounts of nitrogen were found in the CCD even when the fuel and lubricant were nitrogen free. The pyrolysis reactivity of different CCDs was studied to gain an understanding about the transformations that potentially happen over longer times and lower temperatures on the combustion chamber walls. In all cases during mild pyrolysis (375{degrees}C) there was a substantial increase in the level of aromatic carbon and a decrease in the level of organic oxygen. The largest increases in the amount of aromatic carbon occurred for CCDs that were the least aromatic.

• OSTI ID: 370722
• Report Number(s): CONF-960376--
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
COMBUSTION
COMBUSTION CHAMBERS
DEPOSITS
FUEL ADDITIVES
FUELS
GASOLINE
LUBRICANTS
OCTANE
PYROLYSIS