Optimization of the ethanol-fuel emulsion composition for use in diesel engines

Abstract

The use of alternative fuels of biological origin, in particular, alcohols, should be considered as a matter for the very near future. Scientists around the world are exploring more and more concentrated compositions of ethanol-fuel emulsions with various additives. However, to date, the reasonable limits of substitution of diesel fuel with ethanol have not been determined. Taking into account the depth of the problem, first of all, it is necessary to consider the creation of ethanol-fuel emulsions with a number of necessary properties, which is possible only if additives are used. The analysis of the additives used in the fuel showed that the directional effect of the additives is usually very narrow. Accordingly, a complex action additive is required to ensure a number of necessary properties of ethanol-fuel emulsions. The tests were carried out in several stages. The stability of the new fuel composition was investigated using various additives. The additive with the best performance was determined and adopted for further use in experiments. Further, the comparative tests of the operation of the fuel supply equipment, both on the basic fuel and on new fuel compositions, were carried out. The final stage of the research was to check the parameters of the engine operability as a whole when working at the main load and speed modes. The article considers a possible variant of the action of a complex additive based on molybdenum disulfide MoS2 as a combustion ignibitor. A hypothetical type and mechanism of reactions occurring in the combustion chamber of a diesel engine is presented. The results of experiments on the performance of injectors 455.1112010-50 on various compositions of new fuels and under changing conditions are shown. Environmental performance indicators of the 4ChN 11.0 / 12.5 engine are considered when operating according to the external speed characteristic on various fuel compositions. Based on the results of the data analysis, conclusions were drawn about the limitation of the presence of ethanol in the mixture and the substitution limit for the main fuel was justified.

Keywords

diesel / alternative fuel / ethanol-fuel emulsion / fuel additive / injection / bench tests

RIGHTS & PERMISSIONS

Plotnikov S.A., Kartashevich A.N., Plyago A.V., Pachurin G.V.