Mixed SCR deNOx systems of flue gas subregion

The utility model belongs to the technical field of flue gas denitration, concretely relates to mixed SCR deNOx systems of flue gas subregion. DeNOx systems includes the SCR entry flue of following the flue gas direction of advance and setting gradually, first layer ammonia injection grid, first layer baffle subregion, second floor ammonia injection grid, second floor baffle subregion and SCR reactor, first layer ammonia injection grid and second floor ammonia injection grid are by supplying the female pipe of ammonia, a plurality of ammonia branch pipes that spout become with control valve, first layer baffle subregion and second floor baffle subregion are respectively by flue baffle uniformly split a plurality of flue gas passageways cheng, to spout ammonia branch pipe direction parallel with corresponding the layer for every layer of baffle subregion flue baffle direction, set up one in every flue gas passageway spout the ammonia branch pipe, it sets up a plurality of unanimous nozzles with the flue gas di