Abstract
For diesel oils containing fatty acid methyl esters (FAME), an important problem is their susceptibility to oxidation processes as this shortens the maximum storage time of such fuels and may result in deterioration of oil properties and thus affect the engine operation. One of the fuel ageing processes is the formation and release of resins from the fuel. The physical stability of mixtures may be evaluated by means of a physical stability index, determined with using a Turbiscan analyser. The authors attempted to explore the possibility of using this index for evaluating the changes that take place during the ageing of diesel oil. Additionally, the impact of the presence of selected metals on the fuel ageing process was examined. Within the research, diesel oil samples containing various metals were prepared and subjected to the ageing process. Spectrophotometric tests were also carried out with using a Turbiscan instrument. The samples were subjected to oxidation stability tests before and after the ageing process. The physical stability index and, additionally, the oxidation stability of the samples were examined by accelerated ageing methods.
Highlights
The necessity of adding biocomponents had a negative effect on the chemical stability of diesel oil
Based on the Rancimat and PetroOxy test results (Table 2), an opinion may be formulated that the metal deactivator fulfilled its function and slowed down the catalytic action of metals in diesel oil
Tests carried out with using the Turbiscan instrument showed that an opposite effect could be observed in some cases and a fuel sample with the deactivator added was less stable in comparison with a corresponding sample without that admixture
Summary
The necessity of adding biocomponents had a negative effect on the chemical stability of diesel oil. The process of deterioration of the thermo-oxidation stability of fuels, taking place during storage, causes a necessity for the fuel quality to be continuously monitored This may be done by various analytical methods making it possible to determine the induction period, i.e. the time that elapsed from the start of the test to the instant when the reaction between the fuel and oxygen began: the longer the induction period, the better the chemical stability of the fuel. Only the Rancimat method is allowed by the Polish Standard PN-EN 590 for the oxidation stability testing [24] and laid down in the Regulation of the Minister of Economy of 9 October 2015 on Athneoqthuaelrityinrsetqruuimremenetnttshfaotr dmieasyel boeil.u[2s6e]d for fuel stability testing is the Turbiscan analyser In this case, physical rather than chemical stability is determined. After 14 days, stability tests were carried out with using Rancimat and PetroOxy instruments
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