Effect methanol, ethanol, butanol on the emissions characteristics of gasoline engines Syarifudin1, Firman Lukman Sanjaya2, M. Khumaidi Usman3, Yohanes Sibagariang4
1,2,3Department of Mechanical Engineering, Harapan Bersama Politechnic, Tegal, Indonesia.
4Department of Civil Engineering, Quality University, Sumatera Utara, Indonesia
Abstract
The increasing of the volume of motorized vehicles leads to an increase in dependence on fossil fuels and an increase in air pollution. The problem can be reduced by utilizing renewable alcohol fuels such as methanol, ethanol, and butanol. High number of octane and oxygen content is the main reasons. This study aims to observing the exhaust emissions of the gasoline engine with a mixture of methanol, ethanol, and butanol. The percentage of alcohol that used is 0% to 30% by volume. The test was carried out in 2000, 3000, and 4000 rounds. The results of the study explained that the use of methanol, ethanol, butanol in the fuel mixture was proven to reduce exhaust emissions. CO and HC emissions decrease during the percentage of alcohol in the fuel increased. The highest reduction in CO and HC emission in methanol blended fuel was 30%, respectively 94.55% and 82.71%. Meanwhile, CO2 emissions increased by 34.37% at 2000 rpm engine speed. Based on this test, the addition of methanol to fuel can reduce exhaust emissions better than ethanol and butanol.
