Abstract
In connection with the limited resources of fossil fuels and the reduction of emissions and stimulation of agricultural areas, a very important indication is the search for alternative fuels – biofuels. The article presents the results of testing the lubricating properties of selected fuel mixtures. The lubricity of diesel fuel (DF), DF with 7% content of methyl esters of rapeseed oil fatty acids (RME), technical linoleic acid and DF with 7% content of RME and 10% content of technical linoleic acid was tested. The research was carried out on the author's research stand in the amount of 20 dm3 of mixture. Four parameters were taken into account: mass loss of samples, the footprint area of cooperation, diameter of equivalent wheel and average value of the coefficient of friction. It has been shown that the addition of linoleic acid to diesel fuel containing RME causes a significant increase in the mass loss of the samples and the footprint area of cooperation as well as its diameter of equivalent wheel, during lubrication with such a mixture. As a result of the addition of linoleic acid, no positive results were obtained, as the lubricating properties in this case deteriorated. Therefore, it is justified to continue looking for fuel additives that will eliminate this negative effect.
Highlights
Fossil fuels are sources of resources, and their mass consumption has a significant impact on our environment and society [31]
Diesel fuel containing the addition in the form of rapeseed oil fatty acid methyl esters showed a greater mass and surface loss of the samples
The lubricating properties of linoleic acid were found to be intermediate between the lubricating properties of diesel fuel and diesel fuel containing rapeseed oil methyl esters (RME)
Summary
Fossil fuels are sources of resources, and their mass consumption has a significant impact on our environment and society [31]. Environmental requirements apply to both engines and the fuels used to power them. The most realistic scenario to reduce air pollution from outdated vehicles is the use of fuels that do not require any changes to the engine systems [29]. The growing awareness of fossil fuel depletion leads to an intensive search for renewable fuels [13, 30, 38]. The main areas of fuel development are the following areas: improvement of oil refining technology, search for new additives and use of alternative fuels. In addition to the benefits of obtaining raw material for fuel production, this is an opportunity for rural development. The last decade has seen a stunning increase in the production of renewable fuels for energy purposes, growing at an average rate of 7.8% per annum [14]
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