High capacity/low nox radiant wall burner

F - Mech Eng,Light,Heat,Weapons – 23 – C

Patent

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Details

F23C 6/04 (2006.01) F23D 14/04 (2006.01) F23D 14/06 (2006.01) F23D 14/10 (2006.01) F23D 14/12 (2006.01) F23D 14/58 (2006.01) F23M 5/02 (2006.01)

Patent

CA 2388067

A method for operating a radiant wall burner to heat a radiant surface adjacent a combustion zone, said method comprising: providing a fuel lean combustible fuel-air mixture; causing the fuel-air mixture to flow outwardly from a main nozzle, into said combustion zone and generally accross said radiant surface in a circular pattern which essentially surronds said main nozzle in a radial direction; causing the fuel-air mixture to flow outwardly from said main nozzle at an initial velocoty which exceeds the flame speed of the mixture, whereby a detached round flame is created; providing a secondary fuel at a location in the furnace on an opposite side of said zone from said radiant surface, said secondary fuel constituting a substantial portion of the total fuel provided to said combustion zone by said fuel-aire mixture supply system and said secondary fuel nozzle system.

L'invention concerne un procédé d'exploitation d'un brûleur à paroi radiante pour chauffer une surface radiante adjacente à une zone de combustion, ledit procédé consistant à produire un mélange combustible de combustible-air pauvre en combustible, à faire s'écouler le mélange de combustible-air à l'extérieur d'une buse principale jusque dans une zone de combustion et, d'une manière générale, à travers ladite surface radiante en une forme circulaire entourant essentiellement ledit ajutage principal dans un sens radial, à faire s'écouler le mélange de combustible-air à l'extérieur dudit ajutage principal à une vitesse initiale dépassant la vitesse de propagation des flammes du mélange, de manière à créer une flamme ronde détachée, à fournir un combustible secondaire au niveau d'un emplacement se trouvant dans le four sur une face opposée de ladite zone par rapport à ladite surface radiante, ledit combustible secondaire constituant une partie substantielle du combustible total fourni dans ladite zone de combustion par ledit système d'alimentation en mélange de combustible-air et ledit système d'ajutage de combustible secondaire.

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