Effect of Premium-Butanol Blends on Fuel Consumption and Emissions on Gasoline Engine with Cold EGR System

Abstract

Butanol is renewable fuel that can be used as a solution for the increasing fuel consumption and emissions. This is because of the high octane number in butanol increase the effectiveness of the combustion. In addition, high oxygen content in butanol can reduce CO and HC emissions. The purpose of this study is to determine the optimal mixture of premium and butanol on fuel consumption and exhaust emissions on gasoline engines. This study uses a Toyota 7K engine equipped with an Cold EGR system. The percentage of addition butanol in gasoline fuels is 5%, 10%, and 15%. The experiment was carried out at a variation of 2500 rpm to 4000 rpm engine speed. The experimental results show that the addition of butanol in gasoline reduces fuel consumption by 1.9%. The use of the Cold EGR system results in fuel consumption of 0.31 kG.kW/hours in the P85B15 mixture. This value is 16.8% lower than without using the Cold EGR system. Addition of butanol to fuel also increases the EGT. However, the EGT value decreases with the use of the Cold EGR System. The use of a mixture of gasoline and butanol reduced carbon monoxide (CO) and hydrocarbons (HC) by 74.2% and 46.3%. The percentage of CO2 also showed an increase of 58.6 %. However, the use of the Cold EGR system increases the value of HC and CO. The use of the Cold EGR system also increases the value of CO2 emissions by 19.04% compared without using the Cold EGR system.