Spray nozzle

A spray nozzle comprising:

• a first flow channel providing a flow path between a first inlet and a first outlet, the first flow channel being delimited by an inner casing, and
• a second flow channel providing a flow path between a second inlet and a second outlet surrounding the first outlet, the second flow channel being delimited by an outer casing, wherein the first outlet comprises a plurality of first outlet openings, the first outlet openings being separated by first slats extending helically at least a part of the distance between the first inlet and the first outlet,
• the second outlet comprises a plurality of second outlet openings, the second outlet openings being separated by second slats extending helically at least a part of the distance between the second inlet and the second outlet, and
• the second flow channel comprises a plurality of helical sections for bringing a fluid flow arriving to the second flow channel to a cyclonic motion before its arrival to a channel section provided with the second slats.