Biofuels are a very attractive alternative to conventional fuel (diesel fuel) in their use on medium power diesel engines. The effects of using on Diesel engines have been intense studied the engine performances and emissions resulting from use as fuels. The hydrocarbons (HC) emitted by a diesel engine are complex mixtures of unburned and partially burned fuel components in the gaseous and liquid phases, containing dangerous compounds for both the environment and human health. The purpose of this study was to identify from experimental researches the emissions of hydrocarbons using as fuels based on rapeseed oil compared with diesel fuel. This engine type (engine D-2402) equipped the middle power vehicles with different destinations and implicitly with different operating regimes and loads. The engine used in the experimental test equiped some tractors in Romania and the supply unit adapted as the case to use biofuels. Fuels used in experimental research were mixtures of rapeseed oil, rapeseed methyl ester and diesel in different proportions, namely: 80% diesel fuel - 20% rapeseed oil, 50% diesel fuel - 50% rapeseed oil, 25%diesel fuel - 75 % rapeseed oil, 100% rapeseed oil, 100% rapeseed methyl ester (RME) and 100% diesel fuel as (reference fuel). Worldwide research on the use of biofuels in the medium-power diesel engines has underlined the immediate results of using the biofuels on consumption problems, pollution and wear of engine parts. Results and conclusions issued in the work are possible due to the support of the research project co-funded by the European Social Fund through Sectoral Operational Programme Human Resources Development 2007-2013. The theme and direction of approach in this paper represents an innovation in the field of national research. The novelty of these experiments refers to the fuel blends used in the experimental tests and to the importance of results on emissions of hydrocarbons. Practical implications of this work have applicability on the possibility to use these cheaper classes of biofuels in diesel engines in order to reduce hydrocarbon emissions into the atmosphere.

diesel fuel; crude rapeseed oil; hydrocarbons emissions.

Presentation: oral