Abstract: A combustion burner for a boiler includes: an inner cylinder defining a fuel supply passage for supplying fuel; an outer cylinder surrounding the inner cylinder and defining an air supply passage between the inner cylinder and the outer cylinder; and a swirler in the air supply passage, the swirler being configured to swirl air in the air supply passage. The swirler includes a plurality of blades radially disposed between the inner cylinder and the outer cylinder, the plurality of blades extending from an air-supply side toward a combustion-space side of the air supply passage, and each of the plurality of blades having, at least on an inner cylinder side of the blade, a section with a thickness varied in a burner axial direction, the thickness being smaller at an edge portion on the combustion-space side than at a maximum-thickness section of the blade.

Abstract: A combustion burner for a boiler includes: an inner cylinder forming a fuel supply passage for supplying the fuel; an outer cylinder disposed so as to surround the inner cylinder and to form an air supply passage between the inner cylinder and the outer cylinder; and a swirler disposed in the air supply passage and configured to swirl the air flowing through the air supply passage. The swirler includes a plurality of blades radially disposed between the inner cylinder and the outer cylinder, the blades extending from an air-supply side toward a combustion-space side of the air supply passage, and each of the plurality of blades has, at least on an inner-cylinder side of the blade, a section with a thickness varied in a burner axial direction, the thickness being smaller at an edge portion on the combustion-space side than at a maximum-thickness section of the blade.