Patent ID: 8820047

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 pressure surface of each of the swirler vanes; and a cooling unit that cools a part of the vane pressure surface on which the liquid fuel hits, wherein the cooling unit provided on the fuel nozzle includes a water injecting hole that is arranged upstream of the liquid fuel injecting hole provided on the fuel nozzle, and in line therewith, and from which water is injected to the vane pressure surface of the swirler vane.