Venturi cluster, and burners and methods employing such cluster

Details Venturi cluster, and burners and methods employing such cluster Venturi cluster, and burners and methods employing such cluster

F - Mech Eng,Light,Heat,Weapons

23

D

F23D 14/04 (2006.01) F23C 6/04 (2006.01) F23D 14/10 (2006.01)

Patent

CA 2385028

A burner arrangement includes a venturi cluster including a plu- rality of venturis arranged for parallel flow. The multi venturi arrangement uti- lizing pressurized fuel as the inducing fluid to induce a flow of air enables the provision of an ultra fuel lean premix of fuel and air. A central burner tube which extends outwardly beyond the delivery end of a primary burner tip and mounts a relatively small capacity nozzle at a substantial distance from the delivery end of the burner tip enabling the ultra fuel lean mixture to expand and slow down such that its linear speed does not exceed the flame speed of the mixture prior to by the flame of the spaced nozzle. A deflector may be positioned adjacent the nozzle to assist in stabilizing the flame after the expansion and slowing process has been completed.

L'invention concerne un arrangement de brûleur comprenant un ensemble de tubes venturi composé d'une pluralité de tubes venturi disposés de façon à fournir un écoulement parallèle. L'arrangement des tubes venturi utilise un combustible sous pression comme fluide inducteur pour produire un flux d'air, ce qui permet de fournir un mélange préalable de combustible et d'air à teneur extrêmement faible en combustible. Un tube central de brûleur qui s'étend vers l'extérieur, au-delà de l'extrémité de distribution du bec du brûleur primaire, est muni d'un embout à capacité relativement faible, à une distance éloignée de l'extrémité de distribution du bec du brûleur, ce qui permet au mélange à teneur extrêmement faible en combustible de se dilater et de ralentir de façon que sa vitesse linéaire ne dépasse pas la vitesse de la flamme de l'embout éloigné. Un déflecteur peut être placé adjacent à l'embout pour aider à stabiliser la flamme après que les étapes de dilatation et de ralentissement sont terminées.

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