Abstract
The mineral diesel oil sold in Brazil, due to environmental reasons; presents sulfur concentration of 10 ppm, which causes a deficiency of lubricity, since sulfur is one of the chemical species that gives a good lubricating characteristic. Poor lubricity affects performance and causes failure of engine parts. This study aimed to evaluate the use of glycerin as an antiwear additive by means of tribological tests of the mineral diesel S10 B7 and 10 formulations of diesel based fuels, micro emulsified with 0% (distilled water), 7.5% and 15% of glycerin solution. The formulations were subjected to lubricity tests on HFRR (Hight Frequency Reciprocating Rig) under hydrodynamic lubrication conditions, according to the ASTM D-6079 standard. The results showed that the increased concentration of glycerin added to diesel S10 B7 contributes to improved lubricity and wear reduction
Highlights
Diesel is a fossil fuel obtained from the distillation of petroleum, being used mainly in motors of automobiles, buses, trucks and large machines[1,2,3]
From analyzing the results of the glycerin micro emulsified fuels formulations shown in Table 4, it can be concluded that the highest mass concentration of the solution containing distilled water incorporated into the S10 B7 diesel occurred for the surfactants concentration of 11.0 g/100 mL of diesel, and proportion of surfactants (R4/ R6) of 1/1
The results presented in the study of the friction coefficient (COF) corroborate with the stability of the film, as it can be seen in Figure 4, the samples with higher content of glycerin in the aqueous solution have lower coefficients of friction, that is, diesel S10 B7
Summary
Diesel is a fossil fuel obtained from the distillation of petroleum, being used mainly in motors of automobiles, buses, trucks and large machines[1,2,3]. The wide use of this fuel has increased emissions of pollutant gases into the atmosphere such as COx, NOx, SOx and soot[4]. These gases have an influence on the aggravation of the greenhouse effect, cause acid rain and a decrease in the quality of the air[5]. Low sulfur concentration in diesel is required in the United States and Europe[7] This causes a decrease in lubricity, because in the treatment process a large part of the sulfur, oxygenated and nitrogen compounds are withdrawn[8]. It shortens the lifespan of the engine[9] and causes energy dissipation by friction and failure of engine parts such as fuel injectors and pumps[8]
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