PURPOSE: To annularly rotate fine fog drips by inclining a discharge orifice at a specified angle with respect to a spray nozzle useful to spray lime slurry in a gas desulfurizing system, and by prevent the deposition and accumulation of the slurry on the tip face of the nozzle.

CONSTITUTION: A spray nozzle device 10 for spraying lime slurry into a flue 11 such as an exhaust duct in a boiler of a power plant or the like, with lime as fuel is provided with an air inlet 15 at the upstream end of a cylindrical shell 14, an inlet 16 for a fluid such as the lime slurry is furnished intermediate to both ends of the shell 14 and a tubular nozzle tip member 18 at the downstream end of the shell 14, and a plurality of circumferentially spaced discharge orifices 55 pierce the tip member 18. However, in this case, the axis of each orifice 55 is inclined at an angle of about 10° to a first plane including a central line and also at the angle of 35° to a second plane vertical to the first plane.