Effect of fuel aromaticity on diesel emissions

Journal Article · Fri Sep 01 00:00:00 EDT 1989 · Combustion and Flame; (USA)

DOI:https://doi.org/10.1016/0010-2180(89)90134-X· OSTI ID:5674172

Barbella, R; Ciajolo, A; D'Anna, A ^[1]; Bertoli, C ^[2]

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1. Istituto di Ricerche sulla Combustione, CNR, P. le Tecchio, 1-80125 Napoli (IT)
2. Isituto Motori, CNR, Piazza Barsanti e Matteucci, 80125 Napoli (IT)

The effect of the fuel aromatic content on soot and heavy hydrocarbon emissions from a single-cylinder direct-injection diesel engine has been investigated burning a pure paraffinic fuel (n-tetradecane), a tetradecane-toluene mixture (70-30 vol%) and two diesel oils with different aromatic content. All experiments were at various air-fuel ratios with constant engine speed and injection timing advance. The detailed chemical analysis of exhaust heavy hydrocarbons in terms of mass percentage of paraffins, monoaromatics, polyaromatics and polar compounds, and the gas chromatography-mass spectrometry of each hydrocarbon class have been compared with the original fuel analyses in order to discriminate the unburned fuel compounds from the combustion-formed products. The soot emission rate has been found to be independent of the fuel aromatic content, but the fuel affects the quality and quantity of heavy hydrocarbon emission. Low amounts of heavy hydrocarbons, mainly partially oxidized compounds, are emitted from tetradecane combustion, whereas diesel fuel oils produced high emissions of heavy hydrocarbons, mainly unburned fuel compounds. The emission of polynuclear aromatic hydrocarbons (PAH) from tetradecane and tetradecane-toluene diesel combustion indicates that these compounds are combustion-formed products, but unburned fuel PAH are the main components of PAH emitted by the diesel fuel oils.

• OSTI ID: 5674172
• Journal Information: Combustion and Flame; (USA), Vol. 77:3; ISSN 0010-2180
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
54 ENVIRONMENTAL SCIENCES
02 PETROLEUM
DIESEL ENGINES
EMISSION
DIESEL FUELS
COMBUSTION KINETICS
POLYCYCLIC AROMATIC HYDROCARBONS
AIR POLLUTION
CHEMICAL ANALYSIS
CHEMICAL COMPOSITION
COMBUSTION PRODUCTS
GAS CHROMATOGRAPHY
HYDROCARBONS
MASS SPECTROSCOPY
OXIDATION
SOOT
TETRADECANOIC ACID
TOLUENE
VISCOSITY
ALKYLATED AROMATICS
AROMATICS
CARBOXYLIC ACIDS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CHROMATOGRAPHY
ENGINES
HEAT ENGINES
INTERNAL COMBUSTION ENGINES
KINETICS
MONOCARBOXYLIC ACIDS
ORGANIC ACIDS
ORGANIC COMPOUNDS
PETROLEUM PRODUCTS
POLLUTION
REACTION KINETICS
SEPARATION PROCESSES
SPECTROSCOPY
330704* - Emission Control- Hydrocarbons
400800 - Combustion
Pyrolysis
& High-Temperature Chemistry
500200 - Environment
Atmospheric- Chemicals Monitoring & Transport- (-1989)
020500 - Petroleum- Products & By-Products