Oxygenated fuel composition impact on heavy-duty diesel engine emissions
conference paper
This paper reports on a study of a large number of blends of a low-sulfur EN-590 type diesel fuel respectively of a Swedish Class 1 fuel and of a synthetic diesel with different types of oxygenates. Oxygen mass fraction of the blends varied between 0 and 15 %. For comparison, the fuel matrix was extended with non-oxygenated blends including a diesel/water emulsion. Tests were performed on a modern multi-cylinder HD DAF engine equipped with cooled EGR for enabling NOx-levels between 2.0 and 3.5 g/kWh on EN-590 diesel fuel. Additional tests were done on a Volvo Euro-2 type HD engine with very low PM emission. Finally, for some blends, combustion progress and soot illumination was registered when tested on a single cylinder research engine with optical access. The results confirm the importance of oxygen mass fraction of the fuel blend, but at the same time illustrate the effect of chemical structure : some oxygenates are twice as effective in reducing PM as other well-known oxygenates. In combination with conventional CI combustion with
extended ignition delay, such fuel blends will produce extremely low PM levels without the necessity of very high amounts of EGR, suggesting a possible alternative pathway towards clean diesel combustion.
extended ignition delay, such fuel blends will produce extremely low PM levels without the necessity of very high amounts of EGR, suggesting a possible alternative pathway towards clean diesel combustion.
Topics
TNO Identifier
953948
ISSN
01487191
Publisher
SAE International
Article nr.
SAE 2007-01-2018
Source title
SAE Technical Papers, JSAE/SAE International Fuels and Lubricants Meeting, JSAE 2007, 23 July 2007 through 23 July 2007
Pages
1929-1943
Files
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