연소실 압력변동이 스월 화염에서 화염 안정화와 NOx 배출에 미치는 영향

Influence of changing combustor pressure on flame stabilization and NOx emission in swirl flame

  • 김종률 (부산대학교 기계공학과, 부산대학교 기계기술연구소) ;
  • 최경민 (부산대학교 기계공학부, 부산대학교 기계기술연구소) ;
  • 김덕줄 (부산대학교 기계공학부)
  • 발행 : 2006.08.23

초록

In present study, the influence of changing combustor pressure on flame stabilization and nitrogen oxide (NOX) emission in the swirl flame with secondary fuel injection was investigated. The combustor pressure was controlled by suction at combustor exit. Pressure index ($P^*=Pabs/Patm$), where Pabs and Patm indicated the absolute pressure and atmosphere pressure, was controlled in the range of 0.7~1.15 for each equivalence ratio conditions. It could be observed that flame stable region became narrower with decreasing equivalence ratio and pressure index. In this combustion system, stable flames were formed until $P^*=\;0.7$. Emission index decreased with decreasing pressure index for overall equivalence ratio conditions and NOx reduction rates were almost identical for $P^*<1$ regardless of equivalence ratio though EINOx values showed different level with change of equivalence ratio for $P^*{\geq}1$. It is also observed that EINOx decreased with increasing secondary fuel injection ratio. Emission index of nitric oxide was controllable by adjusting the changing combustor pressure and injecting secondary fuel and this NOx reduction technology is applicable to industrial furnaces and air conditioning system.

키워드