Denitration and ammonia spraying device for gas turbine and gas turbine

The invention relates to a denitration and ammonia spraying device for a gas turbine and the gas turbine. The denitration and ammonia spraying device comprises an injection pipe, an atomization air pipe and an atomization spray nozzle, the atomization air pipe sleeves the outside of the injection pipe, and an annular hollow cavity is formed between the atomization air pipe and the outer wall of the injection pipe; two ends of the injection pipe are separately an inlet end and an outlet end, two ends of the atomization air pipe are separately a blocking end and an open end, the outlet end and the open end are flush and connected with the atomization spray nozzle, and the inlet end passes through the blocking end; and a position, close to the outlet end, of the side wall of the atomization air pipe is provided with an atomization air inlet which communicates with the annular hollow cavity. According to the device provided by the invention, ammonia water is atomized, the atomized ammonia water is injected into a