| 摘要 |
PURPOSE:To stabilize the flame only at burner ports regardless of the change of air quantity in premixture and consequently continue stable combustion by a method wherein secondary air is supplied uniformly throughout the whole periphery of the flame formed at the burner ports. CONSTITUTION:Gas supplied through a fuel supply port 2 in a premixture chamber 4 and primary air supplied through primary air supply holes 7 therein are mixed with each other in order to produce premixture in the premixture chamber 4. After that, the premixture is supplied to burner ports 5 so as to form flame 8 to burn there. The supply of secondary air to the flame 8 is performed by two kinds of air streams or by a secondary air stream C, which is supplied through a gap 14 to the root of the flame 8, and a conventional secondary air stream A, which is supplied through secondary air holes 10 to the top of the flame 8. Consequently, the diffusing surface of the premixture jetted through the burner ports 5 and the secondary air is formed between the burner ports 5 and the gap 14 and consequently no heating and thermal deformation on a partition plate 9 is resulted. And yet, no pressure drop in an outer peripheral air passage 6 occurs and as a result stable combustion can be continued, because the magnitude of the gap 14 does not be changed or is kept constant during combustion. |
