Preheating of secondary air from combustion chamber radiation

Details Preheating of secondary air from combustion chamber radiation Preheating of secondary air from combustion chamber radiation

1977-06-29

1979-05-01

Favors, Edward G.

Combustion

Fuel disperser installed in furnace

Furnace heated feed line section

431190, 431242, 431243, F23D 1144

Patent

active

041521072

ABSTRACT:
In an oil fired boiler (with a combustion chamber and a burner which blows a flame into it) there is a J-shaped heat-exchange duct, built on the combustion chamber floor out of thermally ultra-conductive and non-corroding pipes and fittings. Because of the extreme rigidity and brittleness of these, our structure is designed with masonry-like constraints on duct layout: Must rest on floor--never two attachments to anything--must not rely wholly on cement for stability.
The J-duct becomes hot from the radiation in combustion chamber. It serves to heat secondary air and delivers it at suitable discharge regions from which it will join the base of the entering flame.
The tip of J's long leg is outside chamber and gets secondary air from blower. This leg extends into chamber through its front wall then, curving around, its short leg extends forward and ends at location next to front wall's hot face. The heated air is either discharged at this location through an orifice, or else is carried up in a tower-like riser duct and discharged at a higher discharge point almost directly above the location where the short leg ends.

REFERENCES:
patent: 805671 (1905-11-01), Saffell
patent: 1857667 (1932-05-01), Stadler
patent: 2440491 (1948-04-01), Schwander
patent: 2660230 (1953-11-01), Denker et al.
patent: 4050877 (1977-09-01), Craig et al.
patent: 4060374 (1977-11-01), Kwait

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