Experimental Test of the Effect Wet Ethanol on Decreasing Emissions Exhaust in EFI Gasoline Engine with EGR System

Abstract The increase in the number of vehicles results in increased fuel consumption and air pollution. This also affects the more depletion of fossil fuel availability. An increasing number of these vehicles contribute to air pollution in urban areas. Hazardous substances such as NOx (Nitrogen Oxide), CO (Carbon Monoxide), and HC (Hydrocarbon) are harmful to health. In order to reduce the emissions of CO and HC, wet ethanol is one of the solutions to overcome these problems. Besides ethanol can be obtained from materials that are renewable. In fact, wet ethanol has a value of higher octane and higher oxygen content than gasoline. Blending both the fuel is expected to reduce air pollution. The purpose of this research is to obtain the best premium and wet ethanol percentage for lowering emissions of CO and HC. The fuel used is gasoline (88 octane number) and the wet ethanol (109 octane number). The percentage of wet ethanol blended into the fuel is in the range of 5% to 15%. Experiments conducted an engine speed of 2500 to 4000 rpm with an interval of 500 rpm. This study investigates the effects of wet ethanol and premium blends and the use of EGR (Exhaust Gas Recirculation) against exhaust emissions on a gasoline engine with EFI systems (Electronic Fuel Injection). From the results of this study is found that the exhaust gas temperature increases in the increase of engine speed. The addition of EGR reduces the exhaust gas temperature. The increase in BSFC (brake specific fuel consumption) without the largest EGR at we15 is 3.36% at 0.38 kg/kw. Hour, while the decrease in BSFC with the largest EGR at we5 is 17.61% at 0.30 kg/kw. Hour. Wet ethanol and gasoline blends cause a decrease in emissions of CO and HC. With a 15% wet ethanol blend, CO and HC emissions can be reduced to 60.23% and 44.30%, respectively. However, adding 15% wet ethanol into gasoline fuel increases 34.66% of CO2.