Pengaruh persentase CO2 terhadap temperatur dan kecepatan api premixed laminar pada oxy-butane combustion

Abstract

Oxy-combustion is one of the technologies developed to reduce the amount of CO₂ released into the atmosphere in order to reduce the greenhouse effect and global warming. Gas recirculation in oxy-combustion results in the presence of CO₂ in the oxidizer. This study was conducted to determine the effect of the percentage of CO₂ on the laminar premixed flame speed in the oxy-butane combustion process. Experiment was conducted on equivalent ratios of 0.6, 0.8, 1, 1.2 and 1.4. CO₂ content were varied by 50%, 55%, 60%, 65% and 70%, calculated based on the amount of oxygen in the combustion process. The measurement of laminar premixed flame speed was carried out on a cylindrical tube burner. The results showed that the flame temperature and the laminar premixed flame speed decreased with the increasing of CO₂ percentage in the oxidizer. The presence of CO₂ causes the heat generated from the combustion process absorbed by CO₂, so that the flame temperature is reduced. The decreasing in the flame temperature is an important factor which caused the decreasing in laminar premixed flame speed in a mixture with CO₂ content. Furthermore, the presence of CO₂ in the reactants prevents the butane and oxygen from mixing and reacting, hence the flame speed becomes lower. In addition, it is known that for every percentage of CO₂ in the oxidizer, the flame has a maximum flame temperature and speed at an equivalent ratio of unity.