| 摘要 |
<p>In one aspect the invention discloses an improved gas burner with a high turn-down ratio. The improved burner includes first and second gas flow passages (44, 47), a flame front locator (49) in one of the passages of the burner head. Fuel gas is injected into an end of one of of one of the passages (47) and is ignited to establish a flame at the flame front locator (49). Secondary combustion air is provided through the other of the passages (44)which on a high setting enables secondary combustion and on a low setting may mix with the hot gases and cool them resulting in a lower temperature at the cooking vessel.</p> |
