Optimization of composition of mixed biofuels made from vegetable oils for diesel engines

Currently the most part of motor fuels are produced from mineral resources, mainly, from oil. However, along with oil fuels the increasing application of alternative fuels takes place. You must acknowledge the advantages of using alternative fuels produced from the renewable natural resources. As raw material for the production of motor fuels, the following resources can be used: logging and wood processing wastes, wood products and agricultural waste, food industry wastes, biogas, algae and other marine bioresources. The use of fuels of vegetable origin provides circulation of carbon dioxide in the atmosphere, because the combustion of biofuels in internal combustion engines emits about the same amount of carbon dioxide, which is absorbed in the process of preparing raw materials for biofuel production. This leads to the reduction of greenhouse gases emissions and the prevention of the greenhouse effect, global warming and the emergence of various natural anomalies. The authors show the advantages of using biofuels made from vegetable oils in diesel engines and propose the methods of determining the optimal composition of mixed fuels which contain oil diesel fuel and methyl ether of rapeseed oil. Using the proposed methods the authors carry out the optimizational calculations of the composition of such mixed fuels for the diesel engine of Д-245.12С. type. It is shown that the mixture which contains 60 % of the oil diesel fuel and 40 % of the rapeseed oil methyl ester has the best ecological characteristics among the studied mixed biofuels. Even better ecological characteristics are reached when the ingredients of such a mixture are selected according to the changes of engine shaft rotation speed and engine load.