Method for simultaneously removing sulfur oxides and nitric oxides in flue gas

The present invention relates to a method for simultaneously removing sulfur oxides and nitric oxides in flue gas, which belongs to the technical field of flue gas purification. The method comprises the following steps: spraying water or steam into a flue before flue gas from burning equipment enters a fluidized bed reactor through the flue and controlling the temperature of the flue gas within a range of 90-200 DEG C, wherein the flue gas in the flue contains gas components of O2, H2O, SO2 and NOx; directly jetting CaO and/or Ca(OH)2 into the flue to oxidize NO; and controlling the temperature of the fluidized bed reactor to be between 50 DEG C and 90 DEG C for the flue gas to desulfurize and denitrate in the fluidized bed reactor. In the method, desulfurization and denitration can be simultaneously realized in the same system by adjusting processing steps and controlling a reaction condition. When a molar ratio Ca/(S+0.5N) of calcium to sulfur to nitrogen is 1.3, the removal rate of the SO2 can reach over 85 percent, and the removal rate of the NO can reach over 60 percent.