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NOx Emission Characteristics Depending on the Variations in Yaw Angle of the Secondary Air Nozzles in a Coal Fired Boiler  

Kim, Young-Joo (Advanced Power & Combustion Group, KEPRI)
Park, Ho-Young (Advanced Power & Combustion Group, KEPRI)
Lee, Sung-No (Department of Mechanical Engineering, Chungnam National University)
Publication Information
Journal of Korean Society of Environmental Engineers / v.31, no.4, 2009 , pp. 272-277 More about this Journal
Abstract
Three dimensional numerical analysis for the coal fired boiler has been performed to investigate the effect of yaw angle variation of the secondary air nozzles on the combustion characteristics and NOx emission. It was found that the prediction gives a good agreement with plant data. The increase in yaw angle up to $20^{\circ}$ have results in the decrease in NOx emission at furnace exit and recirculation flow intensity, together with the increase of unburned carbon in ash. It also has been recognized the remarkably change in configuration of fire ball with increase in yaw angle. The results from this study would be valuable in the case of the combustion modification of the corner firing coal-fired utility boiler.
Keywords
NOx Emission; Unburned Carbon; Corner Firing; Furnace; Yaw Angle;
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