Patent ID: 8302544
Filing Date: 2012-11-06
Classification: F23D

Abstract:
1. A burner structure comprising: a fuel-air mixture system provided in a burner central portion and supplying a mixture of a fuel and a primary air, said fuel-air mixture system protruding a distance inside an inner wall of a furnace; a secondary air system provided circumferentially around the fuel-air mixture system and supplying a secondary air; a cooling air system provided circumferentially around the secondary air system and supplying a cooling air; a nozzle main body attached to furnace-side end portions of the fuel-air mixture system and the secondary air system in a tiltable form and provided with a flame holder at its tip end; and a cooling air nozzle attached to a furnace-side end portion of the cooling air system in a tiltable form; wherein a tip end position of the cooling air nozzle protrudes substantially the same distance inside the inner wall of the furnace as a tip end position of the flame holder in a tiltable range of the nozzle main body and the cooling air nozzle.