This fountain nozzle device is a two-fluid nozzle comprising a pressure swing nozzle for sprinkling a stock solution and a high-speed gas spouting body provided around the pressure swing nozzle, and has a tapered structure at the tip of the two-pressure nozzle. Further, an air purge hole is provided in the side surface of the accelerated gas swelling tip end portion. Moreover, the spray dryer apparatus arrange | positions this pressurized diaphragm nozzle to the lower part of a drying chamber, and is equipped with the hot-air blow inlet in a drying chamber, and the exhaust port from a drying chamber. The spray dryer device of the closed system has a hot air blowing inlet in the drying chamber and an exhaust port from the drying chamber, while arranging a pressurized two-fluid nozzle device in the upper part of the drying chamber, and the gas for hot air and / or high velocity gas blowing in the drying chamber. Circulate all or part of Maggi used in spray drying.;Further, in the pressurized two-fluid nozzle, the droplet diameter of the spray formed is controlled by adjusting the flow velocity of the blowing high velocity gas.
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