Natural draft burner

Details Natural draft burner Natural draft burner

F - Mech Eng,Light,Heat,Weapons

23

D

F23D 14/02 (2006.01) F23D 14/70 (2006.01) F23L 1/00 (2006.01)

Patent

CA 2694415

A natural draft burner has a burner head and a deflector plate extending radially therefrom and across a firetube housing. An air deflector plate has a plurality of angled vanes for re-directing secondary combustion air flowing through the housing. Secondary air is deflected away from a nozzle tip at the burner head to minimize lifting of the flame by the deflector plate or by a low pressure ring formed around the nozzle tip above the deflector plate for creating an area of low pressure. Preferably, a combination of the deflector plate and low pressure ring provides a stable flame positioned at the nozzle tip under low- fire and high-fire conditions enabling use of a pilotless ignition and flame sensing system which is consistent under low and high fire conditions. More preferably, the deflector plate supports the igniter and optionally a heat return tube for heat tracing of the freeze-prone burner assembly components.

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