Ammonia spraying device and flue gas denitration device

The utility model relates to the technical field of environmental protection, in particular to an ammonia spraying device and a flue gas denitration device.The ammonia spraying device comprises an ammonia spraying pipeline, the ammonia spraying pipeline is suitable for being horizontally arranged in a flue, the cross section of the ammonia spraying pipeline is rectangular, and the side, perpendicular to the flowing direction of flue gas in the flue, of the cross section of the ammonia spraying pipeline is a short side; the edge parallel to the flowing direction of flue gas in the flue is a long edge; and the nozzle is arranged on the ammonia spraying pipeline. Under the condition that the ammonia spraying flow is not changed, namely the ammonia spraying flow is not changed, the projection area of the ammonia spraying pipeline can be greatly reduced and the blocking area to the flue gas is reduced on the premise that the length of the ammonia spraying pipeline is not changed, so that the deamination efficiency