Numerical Simulation of Oxy-fuel Combustion Characteristics in a 300 MW Coal-fired Boiler

Journal of Chinese Society of Power Engineering ›› 2016, Vol. 36 ›› Issue (3) : 172-177.

GE Xueli¹, WU Xiaojiang², ZHANG Jianwen², FAN Haojie¹, ZHANG Zhongxiao¹

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Taking the 300 MW coal-fired boiler as an object of study, the models for reaction mechanism, physical parameters and heat transfer of the combustion process were revised, so as to comparatively investigate the temperature field in the furnace and the carbon content in the pulverized coal by numerical method respectively under air and oxy-fuel combustion conditions. Results show that the reaction mechanism and physical parameters have significant influence on the oxy-fuel combustion, when the ignition of pulverized coal is delayed, and the shape of the flame is narrowed and elongated. With the rise of oxygen concentration, the residence time of coal particles in the furnace reduces while the burnout rate increases. Compared to air combustion conditions, the peak temperature of flue gas and coal particles decreases, the heat-transfer capability reduces and the height of flame center moves upward under oxy-fuel combustion conditions. When the oxygen concentration increases from 26% to 29%, the oxy-fuel combustion has a good agreement with the air combustion in trends of temperature variation. The capacity of heat transfer calculated by numerical simulation is 4%-11% lower than that by thermal calculation.

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oxy-fuel combustion / heat transfer / revised model / char / CFD

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GE Xueli, WU Xiaojiang, ZHANG Jianwen, FAN Haojie, ZHANG Zhongxiao. Numerical Simulation of Oxy-fuel Combustion Characteristics in a 300 MW Coal-fired Boiler. Journal of Chinese Society of Power Engineering. 2016, 36(3): 172-177

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Received	Revised	Published
2015-05-13	2015-07-08	2016-03-15
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2016-03-15

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