| 摘要 |
PURPOSE:To prevent instability of combustion, e.g. blow off, due to blow off even when high load combustion is made on fuel gas having a slow burning velocity and to enable increase of a combustion load by a method wherein burner ports are blinded at intervals of at least two burner ports or up to four burner ports. CONSTITUTION:In burner ports 11 formed in the shape of a lattice, large burner ports with a diameter of 1.5-2.0 millimeters are formed at intervals of a distance of 3.0-4.0 millimeters, and a blind part 12 where a burner port is formed is situated at intervals of three burner ports. When fuel-air mixture of combustion air and fuel gas is increased for high load combustion, the velocity of flow of the fuel-air mixture injected through the burner ports is increased to a value higher than a flame propagation speed. Flame F is blown up to cause the occurrence of blow off. However, since at the blind part 12, recirculation of combustion gas is produced as shown by an arrow mark, fuel-air mixture injected through the burner ports situated around the blind part 12 is continuously ignited by means of high temperature recirculation gas to perform stable combustion, and high load combustion being higher than that of a combustion plate having no blind part 12 can be achieved. |
