Effect of Inner Swirl Angle on Flame Stability of a Double-Swirl Burner with Biogas-Methane Co-Firing

Abstract

This paper studies how the inner swirl angle affects the flame stability of a double-swirl burner with biogas-methane co-firing. Biogas is a renewable fuel that is produced from organic waste by anaerobic digestion, it can be mixed with methane as an act to save methane fuel as well reduce CO2 emissions. However, biogas has combustion challenges due to its high CO2 content. The double-swirl burner is a technology that can improve combustion performance and reduce nitrogen oxide emissions. This study investigates different inner swirl angles with various CO2 fractions in biogas and assesses their effects on flame stability and flame appearance. The paper finds that a higher CO2 fraction and inner swirl angle make the flame less stable and requires more fuel, and also changes the flame shape. The paper gives insights into improving the double-swirl burner for biogas-methane co-firing.