Experimental Study on the Oxygen Combustion Characteristics with $CO_2$ Feeding

$CO_2$ 첨가에 따른 순산소 연소기의 연소특성에 관한 실험적 연구

  • 서정일 (한국과학기술원 기계공학과 대학원) ;
  • 곽영태 (한국과학기술원 기계공학과 대학원) ;
  • 배수호 (한국과학기술원 기계공학과 대학원) ;
  • 홍정구 (한국과학기술원 기계공학과 대학원) ;
  • 이은도 (한국과학기술원 기계공학과 대학원) ;
  • 신현동 (한국과학기술원 기계공학과)
  • Published : 2005.06.30


The performance of oxygen combustion with $CO_2$ 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 $CO_2$ 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 $CO_2$ 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 $CO_2$ feeding flow rate was larger than 15 lpm. The CO emission is varied by changing the $CO_2$ feeding flow rate but the CO emission characteristics is highly affected by excess oxygen ratio. When the excess oxygen ratio is below $\lambda=1.1$, the CO emission increased as the $CO_2$ feeding flow rate increased.