| 摘要 |
PURPOSE:To decrease the content of nitrogen oxides contained in combustion exhaust gas and at the same time to completely burn unburnt content such as carbon monoxide, by providing a secondary air controlling plate, which has secondary air intake holes of which feeding rate of air is as much increased as they are close to the downstream side of a flame, to the side of the forming position of a flame. CONSTITUTION:A secondary air controlling plate 7 is fixed on the side of a burner body 1 in parallel with the longitudinal direction of the burner port 5 of a Bunsen burner body 1 at a position by the side of the forming position of a flame 6 formed on the burner port 5. The secondary air controlling plate 7 has a number of secondary air intake ports 8, which are formed so that the rate of intake air is as much increased as they are close to the downstream side of a flame 6. Incomplete combustion which produces much unburnt content such as CO is prevented and low NOx combustion can be realized by providing the secondary air controlling plate 7 and by taking in a secondary air 12 from the outside of a secondary air controlling plate 7 by a draft force to supply it to the flame 6. Besides the secondary air controlling plate 7 has an effect to cool the flame 6, so that the effect to reduce NOx can be further increased.
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