Effect of Co-firing Ammonia on Coal Volatile Flame Characteristics and Particulate Matter Formation Behaviours
ZHU Jingji,
XU Yishu,
XU Jingying,
WANG Huakun,
LIU Xiaowei,
YU Dunxi,
MA Jingjing,
XU Minghou
Affiliations
ZHU Jingji
State Key Laboratory of Coal Combustion (Huahzong University of Science and Technology), Wuhan 430074, Hubei Province, China
XU Yishu
State Key Laboratory of Coal Combustion (Huahzong University of Science and Technology), Wuhan 430074, Hubei Province, China
XU Jingying
State Key Laboratory of Coal Combustion (Huahzong University of Science and Technology), Wuhan 430074, Hubei Province, China
WANG Huakun
State Key Laboratory of Coal Combustion (Huahzong University of Science and Technology), Wuhan 430074, Hubei Province, China
LIU Xiaowei
State Key Laboratory of Coal Combustion (Huahzong University of Science and Technology), Wuhan 430074, Hubei Province, China
YU Dunxi
State Key Laboratory of Coal Combustion (Huahzong University of Science and Technology), Wuhan 430074, Hubei Province, China
MA Jingjing
State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering, Ningxia Univeristy, Yinchuan 750021, Ningxia Hui Autonomous Region, China
XU Minghou
State Key Laboratory of Coal Combustion (Huahzong University of Science and Technology), Wuhan 430074, Hubei Province, China
Co-firing “zero-carbon, hydrogen rich, high nitrogen” ammonia (NH3) fuel in coal-fired power plant is an important technical route to mitigate CO2 emission. To explore the impacts of co-firing ammonia fuel on coal combustion and pollutant formation behaviour, the coal-ammonia co-firing experiments were carried out on a McKenna type flat-flame burner system. Combined with visible-light camera, flue gas analyser and thermophoresis probe sampling system, the influence of co-firing ammonia on the flame properties, gaseous pollutant and particulate matter formation was explored. The results show that the ammonia fuel ignites ahead of coal, and the additional heat released from ammonia combustion promotes the pyrolysis of coal and the release of volatile. Thereafter, it promotes the ignition and combustion of volatile, resulting in the increase of flame height and temperature. The added NH3 is partially converted into NO in the volatile flame, resulting in a notable increase in NO concentration. Adding NH3 improves the equivalent ratio of gaseous fuel, which promotes the conversion of volatile to soot, and finally increases the yield of soot particles.
