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Gas Convection Burner
March 2002
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Wayne Combustion Systems has a new patented technology that relates to convection ovens and, more particularly, to a gas burner for a fan-driven convection oven. The burner is formed of a circular or square cross section bent in a circular configuration interconnected to a fitting, which itself is connected to a gas source. A series of slots are located in the outer periphery of the face of the circular or square cross section. Each slot is laser cut to a specific dimension on the outside diameter. The burner configuration produces a short, tight, and stable flame with the gas pressure at each of the slots from the respective cross sections inputs remaining relatively consistent. It has been found that when a burner of this configuration is utilized in a convection oven environment, together with a fan for blowing heated air into a convection chamber, even the turbulent flow of the fan does not blow out the flames. The burner is disposed around the outer periphery of a convection fan. A short, cylindrical sleeve extends along the fan axis between the outer periphery, and the burner and serves as an inner baffle. A flat ring extends radially from the downstream end of the cylindrical sleeve, with respect to air flow through the fan, at least coextensively with and preferably outwardly of the periphery of the annular burner and near one side of the annular burner. This ring serves as an outer burner baffle.

The company's burner, when used in a convection oven, is said to produce several advantages. Since the flame is proximate to the fan path and in the same chamber as the fan, most of the heat generated by the burner is directed by the air flow into the oven cavity and not wasted radiating in other directions. Secondly, the burner reportedly reaches operating temperature much more quickly than an electric element does, reducing preheat energy loss. Accordingly, when used in a convection oven, once a preheat temperature is obtained and the burner turned off, there is much less lag in the desired rise in operating temperature and less heat is lost in the interim. The burner is said to produce a tight flame, not susceptible to being blown out by the convection fan mounted in the same chamber and which can also be ignited despite the ongoing fan flow.

 

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