Patent ID: 8656699

Claim:
A combustion burner comprising: a fuel nozzle; a burner tube that surrounds the fuel nozzle to form an air passage between the burner tube and the fuel nozzle; a plurality of swirler vanes being arranged in a plurality of positions in a circumferential direction on an external circumferential surface of the fuel nozzle, each of which extends along an axial direction of the fuel nozzle, and gradually curves from upstream to downstream so as to swirl air flowing in the air passage from the upstream to the downstream; a liquid fuel injecting hole that is formed on the fuel nozzle, and from which a liquid fuel is injected to a vane surface of each of the swirler vanes; and a cooling unit that cools a part of the vane surface on which the liquid fuel hits, wherein the liquid fuel injecting hole is arranged on a vane pressure surface of the swirler vane; and the cooling unit includes a water injecting hole in fluid communication with a water source, that is arranged upstream of the liquid fuel injecting hole on the vane pressure surface, and from which water is injected to the vane pressure surface of the swirler vane.