Flash-tube ignition system

Details Flash-tube ignition system Flash-tube ignition system

1976-10-04

1978-06-27

Favors, Edward G.

Combustion

Burner ignited by flash flame through conduit

126 91A, 431353, F23C 310

Patent

active

040972232

ABSTRACT:
A combustible fuel gas burner has a primary tube supplying gas and primary air to a main burner, a secondary tube supplying secondary air to the main burner to afford complete combustion, and an exhaust tube through which the products of combustion are exhausted. The exhaust tube also acts as a flash-tube for igniting the main burner. In the absence of combustion, the gas and primary air issuing from the primary tube and the secondary air issuing from the secondary tube combine to form an air-gas mixture in the exhaust tube which is too lean (below the lower limit of flammability) to be ignitable. The supply of secondary air is controlled so as to vary the air-gas ratio in the exhaust tube such that this ratio changes through a spectrum of values between the lower and upper limits of flammability wherein the flame propagation speed of the mixture is substantially greater than the flow velocity thereof. A resistance coil is provided at the outlet of the exhaust tube and is energized at an optimum value of the changing ratio, corresponding to an explosive mixture, whereby a flame travels or flashes back to the main burner.

REFERENCES:
patent: 2041312 (1936-05-01), Winder et al.
patent: 2255540 (1941-09-01), Dreffein
patent: 3174474 (1965-03-01), Jones et al.
patent: 3220401 (1965-11-01), Jones et al.
patent: 3225757 (1965-12-01), Keller

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