| 摘要 |
PURPOSE:To obtain a complete combustion due to a constantly stable flame by supplying air only in a quantity required for combustion to a secondary burning part wherein an incompletely burnt gas sent from a primary burning part is subjected to a diffusion combustion, and discharging surplus air as it is. CONSTITUTION:Secondary air is supplied through an air passage 49 formed outside partition plate 48, whereby a resident time of a reaction of the secondary air with oxygen at a premixed combustion gas portion is prolonged and a diffusion combustion can be carried out by sufficiently supplying oxygen thereto. Further, the passage 49 output the partition plate 48 can secure an area sufficient for the structure, and hence, even if the quantity of the incomplete combustion gas is increased by making the combustion state 'strong', a sufficient quantity of secondary air can be supplied, this can sufficiently follow the flame rising, and adherence of soots or the like can also be prevented. Further, secondary air is supplied from the outside to a secondary burning portion 30, and a part necessary for the quantity of the premixed combustion gas is completely mixed, and unnecessary (surplus) air does not make contact with the flame but is discharged through an upper opening 44.
|
