| 摘要 |
<p>PURPOSE: To obtain a gas burner, producing low NOx and flame of short length, by a method wherein an ejector, throttling the outlet port unit of a preheated air supplying passage to draw exhaust gas in a furnace, being recirculated into a recessed place, and mix it in the recessed place, is formed while fuel gas injection ports are provided on furnace walls at the side of the recessed place. CONSTITUTION: A recessed place 2, whose front surface is opened in the inside wall surface 1 of a furnace, is provided in a burner tile 3 and the outlet port of preheated air supplying passage 4 is opened on the rear end surface of the recessed place 2 while the outlet port unit of the preheated air supplying passage 4 is throttled to form an ejector 5. The ejector 5 draws gas in the furnace, which is recirculated into the recessed place 2, by the momentum of the injected preheated air and mixes it into preheated air in the recessed place 2 to inject it into the furnace again. Further, fuel gas ejection ports 6, whose ejecting direction is slanted toward the center, are provided on the wall surface 1 in the furnace at both sides of the recessed place 2 and after a temperature in the furnace has arrived at a temperature higher than the igniting temperature of the fuel, low oxygen concentration combustion and low-NOx concentration combustion can be effected by fuel, ejected out of the fuel ejection port 6, air-fuel mixture, ejected out of the recessed place 2.</p> |
