Modeling of the optimal component composition of biodiesel fuel

The article presents the results of study to determine the component composition of rape-based biodiesel. Modeling of the optimal component composition taking into account low-temperature properties and cetane number was carried out. According to the studies, mathematical models of changes in the low-temperature properties of biodiesel fuel depending on the percentage of rapeseed oil were obtained, the optimal ratio of its components was determined and justified. The tests were conducted in 2012-2019. The studied temperature limits correspond to the extreme temperature values of the central and southern regions of the Russian Federation. The second important task was to determine the optimal ratio of diesel fuel and rapeseed oil while meeting the requirements of GOST R52368-05 for the cetane number of biodiesel fuel. Studies of the optimal percentage ratio of rapeseed oil and diesel fuel per cetane number showed that biodiesel, which contains rapeseed oil in a concentration of up to 30 %, meets the requirements of GOST R52368-05 (EN 590:2009). Certified equipment was used in the studies, and the methodology met the requirements of the state standard for their implementation. To solve the problem of determining the optimal ratio of biodiesel components, a methodology for assessing temperature and cetane number properties, as well as foreign scientific literature was analyzed in the field of research data. According to the results of the research, hypotheses were put forward that the lowtemperature properties and cetane number of biodiesel fuel change with an increase in the proportion of rapeseed oil in it, as well as the possibility of mathematical modeling of its optimal component composition corresponding to environmental temperature conditions during operation of the equipment. The reliability of the approximation of the obtained dependences was 0.83...0.91 when studying the low-temperature properties of biodiesel samples within the specified temperatures from -40 to 0 °C.

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