미분탄 순산소 연소 운전 모드 전환 과정에 대한 Pilot 규모 설비에서의 실험적 연구
An Experimental Study on Mode Switching from Air-firing to Oxy-firing in Pilot-scale Combustion Systems.
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Oxy-coal combustion for CO₂ capture in coal power plants entails a mode switching from air-firing to oxy-firing. In this study, procedure of the mode switching was investigated and discussed through experiments in pilot scale facilities: (1) a 0.3MWth furnace with a vertical single burner and a FGR(Flue Gas Recirculation) system (2) a 1MWth 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.
Abstract
Oxy-coal combustion for CO₂ capture in coal power plants entails a mode switching from air-firing to oxy-firing. In this study, procedure of the mode switching was investigated and discussed through experiments in pilot scale facilities: (1) a 0.3MWth furnace with a vertical single burner and a FGR(Flue Gas Recirculation) system (2) a 1MWth 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.
참고문헌 (12)
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