F - Mech Eng,Light,Heat,Weapons – 23 – D
Patent
F - Mech Eng,Light,Heat,Weapons
23
D
158/47
F23D 99/00 (2010.01) F23Q 7/10 (2006.01) G01N 25/40 (2006.01)
Patent
CA 1066607
FLASH-TUBE IGNITION SYSTEM WITH MEANS FOR VARYING THE COMBUSTIBLE MIXTURE WITHIN THE FLASH-TUBE Abstract of the Disclosure 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.
286488
Cutler-Hammer World Trade
Na
LandOfFree
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