Combustion burner and boiler

A combustion burner comprising:

• a fuel nozzle ejecting a fuel gas being a mixture of fuel and air;
• a combustion air nozzle ejecting air from an outer side of the fuel nozzle;
• a first member arranged inside the fuel nozzle and comprising a first inclined surface inclined with respect to a flow of the fuel gas and a first inclination end edge, the first inclined surface ending inclination at the first inclination end edge;
• and
• second members arranged downstream of the first inclination end edge in a direction of the fuel gas flow and each comprising a second inclined surface inclined toward the first member with respect to the fuel gas flow and a second inclination end edge, the second inclined surface ending inclination at the second inclination end edge;
• the second members being disposed on both sides of the first member.

A combustion burner comprising:

• a fuel nozzle ejecting a fuel gas being a mixture of fuel and air;
• a combustion air nozzle ejecting air from an outer side of the fuel nozzle;
• a first member arranged inside the fuel nozzle and comprising a first inclined surface inclined with respect to a flow of the fuel gas and a first inclination end edge, the first inclined surface ending inclination at the first inclination end edge;
• a second member arranged downstream of the first inclination end edge in a direction of the fuel gas flow and comprising a second inclined surface inclined toward the first member with respect to the fuel gas flow and a second inclination end edge, the second inclined surface ending inclination at the second inclination end edge;
• and
• rectifying plates extending from a first end portion to a second end portion of the fuel nozzle;
• the first member and the second member being oriented in a vertical direction and arranged at predetermined intervals in a horizontal direction;
• the rectifying plates being disposed at both ends of the first member and the second member in the fuel gas flow direction so as to face each other;
• a distance between the facing rectifying plates gradually expanding toward a downstream side in the fuel gas flow direction.