SCR + ozone denitration coupling system

The utility model discloses an SCR + ozone denitration coupling system, and relates to the technical field of flue gas denitration. Wherein the boiler comprises an upper-stage economizer, a lower-stage economizer and an air preheater; the SCR reactor is used for receiving the flue gas led out from the upper-stage economizer, carrying out SCR reaction and guiding the flue gas into the lower-stage economizer after the reaction; and the ozone denitration reactor is used for receiving the flue gas passing through the lower-stage economizer and the air pre-heater and carrying out denitration reaction. By utilizing the characteristic of low ammonia nitrogen ratio of SCR (Selective Catalytic Reduction) when the denitration efficiency is not high and the advantage that the ozone consumption of ozone denitration is in direct proportion to NOx removal under any denitration efficiency, on one hand, the operating cost of an enterprise is reduced, on the other hand, NOx emission of the enterprise can meet the environmenta