미분탄-암모니아 혼소 및 암모니아 전소 부하 변화 시 스월 구조에 따른 화염 안정성 평가
Effect of Swirl Structure on Flame Stability in Pulverized-Coal Ammonia Co-Firing and Ammonia Sole-Firing under Load Variation
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Ammonia-coal co-firing can reduce CO2 emissions in pulverized-coal boilers, but ammonia’s low burning velocity makes flame stabilization a key design issue. This study investigates the impact of swirler geometry on flame stability in a lab-scale pulverized coal-ammonia burner. Six tangential swirlers, combining three port numbers (8, 6, 4) and two axial positions (upper: U, lower: D), were tested over 1-5 kWth. Flame imaging and two-color pyrometry quantified apparent flame intensity and coal particle temperature, and non-reacting CFD clarified the internal recirculation and turbulence fields. The 8-port cases (U-8, D-8) secured the widest stable operating range, whereas 4-port swirlers exhibited frequent ignition failure and blow-off at low loads. D-type geometries enhanced stability by promoting recirculation of coal reaction heat into the flame root. These results provide practical design guidelines for stabilizing ammonia-coal co-firing burners.
Abstract
Ammonia-coal co-firing can reduce CO2 emissions in pulverized-coal boilers, but ammonia’s low burning velocity makes flame stabilization a key design issue. This study investigates the impact of swirler geometry on flame stability in a lab-scale pulverized coal-ammonia burner. Six tangential swirlers, combining three port numbers (8, 6, 4) and two axial positions (upper: U, lower: D), were tested over 1-5 kWth. Flame imaging and two-color pyrometry quantified apparent flame intensity and coal particle temperature, and non-reacting CFD clarified the internal recirculation and turbulence fields. The 8-port cases (U-8, D-8) secured the widest stable operating range, whereas 4-port swirlers exhibited frequent ignition failure and blow-off at low loads. D-type geometries enhanced stability by promoting recirculation of coal reaction heat into the flame root. These results provide practical design guidelines for stabilizing ammonia-coal co-firing burners.