CO2 첨가에 따른 순산소 연소기의 연소특성에 관한 실험적 연구

Abstract

The performance of oxygen combustion with CO2 feeding was investigated in a pyrex tube furnace. The inverse type multi-hole burner was used for improving mixing and wide operating range. It introduced oxygen, fuel, and oxygen, respectively, from center tube to outer tubes. Oxygen combustion characteristics with excess oxygen ratio, oxygen feeding ratio, and CO2 feeding flow rate were studied to optimize the operating condition and to apply the oxygen combustion with recirculation of flue gas to a real furnace. This paper presents results on the effect Of CO2 feeding flow rate on the structure of the flames and concentrations of NO and CO emissions. The visible flame length was shortest due to well mixing between fuel and oxygen when the oxygen feeding ratio was 0.25. The NO emission was reduced drastically regardless of excess oxygen ratio when the CO2 feeding flow rate was larger than 15 lpm. The CO emission is varied by changing the CO2 feeding flow rate but the CO emission characteristics is highly affected by excess oxygen ratio. When the excess oxygen ratio is below λ=1.1, the CO emission increased as the CO2 feeding flow rate increased.