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 suitable for being horizontally arranged in a flue, the cross section of the ammonia spraying pipeline is in a rhombus shape, the short diagonal line of the rhombus is perpendicular to the flowing direction of flue gas in the flue, and the short diagonal line of the rhombus is perpendicular to the flowing direction of the flue gas in the flue; the long diagonal line of the rhombus is parallel to the flowing direction of flue gas in the flue; and the nozzle is arranged on the ammonia spraying pipeline. As the short diagonal is perpendicular to the flowing direction of the flue gas, the projection area of the ammonia spraying pipeline is the product of the length of the short diagonal and the length of the ammonia spraying pipeline on the premise that the length of the ammonia spraying pipeli