Premix single stage low nox burner

Details Premix single stage low nox burner Premix single stage low nox burner

F - Mech Eng,Light,Heat,Weapons

23

D

F23D 14/02 (2006.01) F23D 14/14 (2006.01) F23D 14/82 (2006.01)

Patent

CA 2108498

ABSTRACT OF THE DISCLOSURE A premix burner has a mixing plenum, a mesh flametrap and a ceramic honeycomb arranged in series. The mixing plenum has inner and outer chambers, with a mixing nozzle for introducing a gaseous fuel concentrically located in the inner chamber. The burner is operated with either high excess air or flue gas recirculation to produce a low temperature flame at a flame face defined by the honeycomb. The thorough premixing of air and fuel ensures a flame with homogeneous air-to-fuel ratios across the flame face, producing low NOx levels. The honeycomb and flametrap also function as flame arrestors to prevent burner flashback. A method for attaining a low temperature, low NOx flame using excess air, with or without flue gas recirculation, is also disclosed.

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