Journal of the Korean Society of Combustion (한국연소학회지)

The Korean Society of Combustion (한국연소학회)
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An Experimental Study on Mode Switching from Air-firing to Oxy-firing in Pilot-scale Combustion Systems

미분탄 순산소 연소 운전 모드 전환 과정에 대한 Pilot 규모 설비에서의 실험적 연구

  • 최종균 (한국생산기술연구원 에너지시스템연구그룹) ;
  • 나익환 (한국생산기술연구원 에너지시스템연구그룹) ;
  • 이재욱 (한국생산기술연구원 에너지시스템연구그룹) ;
  • 채태영 (한국생산기술연구원 에너지시스템연구그룹) ;
  • 양원 (한국생산기술연구원 에너지시스템연구그룹) ;
  • 김영주 (한전전력연구원 수화력발전연구소) ;
  • 김종안 (한전전력연구원 수화력발전연구소) ;
  • 서상일 (한전전력연구원 수화력발전연구소)
  • Received : 2011.05.30
  • Accepted : 2011.06.17
  • Published : 2011.09.30
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Abstract

Oxy-coal combustion for $CO_2$ capture in coal power plants entails a mode switching from air-firing to oxyfiring. In this study, procedure of the mode switching was investigated and discussed through experiments in pilot scale facilities: (1) a 0.3 $MW_{th}$ furnace with a vertical single burner and a FGR(Flue Gas Recirculation) system (2) a 1 $MW_{th}$ furnace with horizontal 4 burners and a FGR system. Principle of the mode switching was established and performed with control of FD fan, FGR fan, ID fan and oxygen flow rates. We have found that equivalence ratio in the oxy-firing mode should be increased more than that in the air-firing to achieve stable mode switching. Control of FD, ID and FGR fans should be performed carefully in the mode switching, in the sense of complete combustion and flame attachment. Moisture contents in the ash and the flue gas recycled to the primary oxidizer stream should be removed to prevent condensation, corrosion and duct clogging.

Keywords

References

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