Importance

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Abstract

A burner suitable for use in conjunction with an air heater. The burner has a burner plate including a plurality of slots. The burner plate slots are aligned with and spaced from fuel supply tubes. The tubes have spaced apart orifices that discharge fuel gas in conical patterns and direct the gas jets through the slots in the burner plate and into the combustion chamber downstream from the burner. A baffle plate is positioned above the fuel supply tubes and extends across an air supply plenum. The baffle plate includes air discharge orifices through which the air from the plenum enters the burner in substantially uniform flow. The baffle plate orifices direct the air toward the burner plate for cooling. The air heated by the burner plate eventually flows toward and through the burner plate slots where it forms a layer between the fuel gas jets and the perimetrical surfaces and edges of the burner plate slots and, thus, maintains the fuel gas spaced from these surfaces and edges. The gas velocity exceeds the air velocity to the extent that the gas and air flows are effectively kept separate before entering the combustion chamber. With this construction, very high fuel flow velocities can be used to generate very high turbulence, and a high intensity flame with reduced NO.sub.x emissions without flame flashback into the burner, within wide turndown.

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First Claim