GB1372184A - Tunnel burner - Google Patents

Abstract

1372184 Gas burners BRITISH GAS CORP 30 Nov 1971 [5 Sept 1970] 42640/70 Addition to 1243626 Heading F4T A nozzle mixing tunnel burner (Fig. 1) comprises a refractory body having a bore 19 forming a combustion chamber 20, a nozzle core 22 having a gas supply bore 23 which discharge through radial parts 24, the gas flow being induced by the passage of air through an annular slot 26 formed between an aperture 18 in a plate 21 and a rib 25 on the nozzle core 22, the air expanding into a chamber 27 and mixing thereon with the gas, the mixture burning beyond the end face of the core 22. The part of the bore surrounding the core 22 may be formed by a metal bush lining a counterbore in the refractory body, and this bush may also extend through the plate 21. The position of the slot 26 may be varied between that shown and a position in which the rib 25 is dispensed with and the aperture 18 in the plate 21 is correspondingly' reduced. The nozzle core 22 may be held in place by radial ribs in the slot 26 or upstream thereof or by a separate apertured plate surrounding the core. Alternatively the slot 26 may be replaced by a series of separate apertures arranged in a circle. In Fig. 13 there is shown a linear type of burner producing a flat flame and this comprises a rectangular box 32 having an air manifold 34 and a fuel manifold 35. The air passes through a slot 41 expanding into the chamber 27 and mixing therein with gas drawn through a row of parts 43 leading from the manifold 35, the mixture then passing to the combustion chamber 20. The slot 41 may be replaced by a line of circular apertures.