Flame forming burner

Details Flame forming burner Flame forming burner

1978-01-03

1980-05-06

Davis, Albert W.

Combustion

Mixer and flame holder

F23D 1340

Patent

active

042015391

ABSTRACT:
A flame forming burner for simultaneously minimizing excess air consumption while suppressing NO.sub.x emissions. A dual zone air register is provided to supply primary air in substoichiometric quantity into mixture with fuel to produce a flame in a primary zone. Additional air is introduced around the flame and downstream of the initial combustion site in a secondary zone, in sufficient quantity to complete combustion. In the preferred embodiment, primary air is provided through a venturi throat, and secondary air is provided through an annular passage equipped with vanes which generate dual counter-rotating (DCR) air flow surrounding the primary zone. Dampers for each register control the primary to secondary air ratio. Preferably, a divergent, non-circular throat provides flame shaping.

REFERENCES:
patent: 3285315 (1966-11-01), Voorheis
patent: 3409383 (1968-11-01), Voorheis
patent: 3563470 (1971-02-01), Suzuki
patent: 3700376 (1972-10-01), Niepenberg et al.
patent: 3748087 (1973-07-01), Shular
patent: 3765345 (1973-10-01), Binasik et al.
patent: 4049021 (1977-09-01), Fromm et al.

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