Aplicação da mistura gasolina-butanol em um motor de combustão interna Ciclo Otto

Abstract

Butanol is a non-renewable alcohol that has various applications in the chemical industry in general. However, several researches have been developed in Brazil aiming at the production of biobutanol, that is, butanol of renewable origin, in addition to its use in Otto cycle engines. Butanol is a potential alternative to ethanol and offers many benefits including a much higher heating value and lower latent heat of vaporization. It also has a higher cetane number, less corrosive and less prone to water absorption than ethanol, which allows it to be stored and transported using the same gasoline infrastructure. This work aims to evaluate the impact of the addition of butanol to gasoline on fuel consumption and engine emissions and also to discuss the feasibility of supplying internal combustion engines with the blend. The methodology adopted consisted of experimental tests performed on an Otto cycle engine operating with butanol-gasoline type A blends in different proportions (Bu00, Bu10, Bu50 and Bu100), and with load variation (0.35 kW, 0.70 kW and 1.05 kW). Regarding the results, the addition of butanol to gasoline presented advantages due to the reduction of the specific consumption in the minimum and intermediate load, which is directly related to the efficiency of the engine. In addition, the increase of butanol in the blend increases CO2 emissions and decreases that of SO2 and CH4.