Abstract
In this paper, the combustion characteristics of lignite with different levels of predrying and the influence of different oxy-fuel concentration on the combustion characteristics of pulverized coal are studied with CFD software. The results show that with the increase of lignite moisture content, the temperature level in the burner decreases gradually, which affects the ignition of pulverized coal and the thermal efficiency of the furnace, and the amount of NO and intermediate products in the furnace also decreases. The flame distance of pulverized coal in oxy-fuel combustion is shortened and the combustion rate is accelerated. The ignition temperature and the production of NO and SO2 are reduced, and the concentration of CO2 can reach more than 90%. The local high temperature will appear in oxy-fuel combustion, and it will increase as the oxygen concentration increases, and the temperature of surrounding flue gas will become more uniform.
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