Low nox gas burner

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

Patent

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Details

F23D 14/58 (2006.01) F23D 14/06 (2006.01) F23D 14/70 (2006.01) F23D 14/84 (2006.01) F24H 9/18 (2006.01)

Patent

CA 2238793

A gas burner adapted to discharge said fuel at its the periphery for combustion, includes upper and lower concave plates secured together to define a chamber and an outer periphery having a plurality of burner ports. The upper plate preferably has a periphery extending radially at least as far as the lower plate. The periphery of the upper plate is downwardly angled, preferably more steeply than the periphery of the lower plate. The peripheral edge of at least one or the other of the top or bottom burner plates extends radially outwardly from the central axis a distance beyond the location of the burner ports and into the path of burning gases issuing from the ports whereby the temperature of said burning gases is reduced. Preferably, the periphery of the upper plate extends downwardly to an elevation below the upper edges of the burner ports, so that gases emerging from the ports are caused to impinge against the periphery, thus cooling the gases and thereby reducing the NOx content of the combustion gases.

Brûleur à gaz conçu pour expulser le combustible à sa périphérie en vue de la combustion. Il comprend des plaques concaves supérieure et inférieure fixées ensemble afin de délimiter une chambre et un périmètre extérieur muni d'une série d'orifices de combustion. La plaque supérieure a, de préférence, un pourtour qui s'étend radialement au moins jusqu'à la plaque inférieure. Le pourtour de la plaque supérieure est incliné vers le bas, de préférence, de manière plus prononcée que le pourtour de la plaque inférieure. Le bord du pourtour d'une des plaques ou de la plaque supérieure et de la plaque inférieure s'étend radialement vers l'extérieur à partir de l'axe central à une certaine distance au-delà de l'emplacement des orifices de combustion et dans le passage des gaz de combustion provenant des orifices de combustion dans lesquels la température des gaz de combustion est réduite. De préférence, le pourtour de la plaque supérieure pointe vers le bas jusqu'à un point au-dessous des bords supérieurs des orifices de combustion, de sorte que les gaz sortant des orifices sont forcés de frapper le pourtour, ce qui a pour effet de les refroidir et de diminuer le contenu en NOx des gaz de combustion.

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