Abstract
One of the sources of renewable energy is biomass. It includes agricultural wastes, which can be converted into bioethanol. The latter could be mixed with gasoline in spark ignition engines to improve their performance and to reduce their emissions. The first objective of this study was to investigate the effect of bread yeast (Saccharomyces cerevisiae) ratios (0.025, 0.075 and 0.125 (g yeast)/(g dates)) on the production time and rate of bioethanol at 30 ℃. The bioethanol was extracted from wastes of dried Sukkary palm dates. The second objective was to explore the effect of blending the bioethanol with gasoline at (E20) on the braking torque and the braking power of dates harvesting machine, which was operated by 1 kW, 4-strokes, single cylinder, spark ignition engine. This exploration was done by using rope brake dynamometer. The results of bioethanol production showed a maximum specific production of 0.405 (L Bioethanol)/(kg dates ). Whereas, the highest production rate was 2.90 (kg bioethanol)/hour at 30 °C and 0.125 (kg yeast)/(kg dates) at which the fermentation was completed in 11 hours. However, the results of fuels blending showed a general enhancement by nearly 17% in the braking torque and the braking when E20 is used in comparison to gasoline (octane 91) only.
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