Patent ID: 8561554

Claim:
A burner structure of a boiler comprising: a single air flow passage for injecting air into a furnace through an air nozzle; and a fuel passage for injecting fuel into the furnace through a fuel nozzle disposed inside the air nozzle, wherein the air flow passage has a bent portion just before the air nozzle, and the bent portion is formed so that a center line of the air flow passage which extends along centroids of cross-sections of the air flow passage is bent at the bent position, wherein a guide vane is provided in the air flow passage, the guide vane formed to extend from an upstream side to a downstream side of the bent portion so that the guide vane divides the air flow passage at the bent portion into two or more divided air flow passages, wherein the air flow passage is provided with a drift control part for varying the ratio of the flow passage resistances of each of the divided air flow passages divided by the guide vanes.