Abstract
In order to increase the possibility of utilizing ethanol to propel the combustion ignition engines, ethanol or methanol blends with diesel oil or other similar fuels are used. However, ethanol has a low solubility index in diesel fuel especially at low temperatures, which requires the use of additives to improve this feature. The paper presents the results of comparative tests of the derived cetane number of diesel fuel blend with ethanol and the addition of dodecanol which is used to improve the miscibility of ethanol with diesel fuel. The results of tests indicate that the effect of dodecanol additive in blended diesel fuel-ethanol on the auto-ignition properties of such fuel is negligible.
Highlights
Introduction by the European Union of increasingly restrictive standards on toxicity of flue gases emitted by combustion engines necessitates the search for fuels that would be environmentally friendly and cost-competitive as compared with petroleum-based fuels
Ethanol miscibility with diesel fuel is affected by the presence of water in fuel, even small quantity of which can cause a separation of blended components
Determination of derived cetane number of diesel fuel and diesel fuel blend with ethanol with addition of dodecanol was conducted according to ASTM D7668 standard
Summary
Introduction by the European Union of increasingly restrictive standards on toxicity of flue gases emitted by combustion engines necessitates the search for fuels that would be environmentally friendly and cost-competitive as compared with petroleum-based fuels. One of the additives that improves the stability of diesel fuel blend with ethanol and improves their miscibility is the dodecanol It is characterized by good solubility in both of these fuels and its volume fraction in the blend may amount up to 3% [4]. The following methods are used to determine the cetane number [9]: – method consisting in calculating the value of derived cetane number based on the average value of ignition delay measured during fuel combustion in a constant volume combustion chamber, – spectral analysis in the medium infra-red, – method consisting in comparing the blends tested with analogous blends of known cetane number with a use of a test engine under standard test conditions. In order to determine DCN value, the normative test method consisting in fuel combustion in a constant volume combustion chamber was used [1]
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