High efficiency furnace with low polluting emissions

Details High efficiency furnace with low polluting emissions High efficiency furnace with low polluting emissions

1977-03-14

1979-02-13

Wayner, William E.

Stoves and furnaces

Hot-air furnaces

Liquid or gaseous fuel

431185, F24H 306

Patent

active

041389867

ABSTRACT:
A domestic furnace for heating a fluid that is circulated through a residential building includes an oil burner, a firebox for combustion products of the burner, a heat exchanger and a flue. A conduit extending from outside of the building supplies outside air to the burner and to the flue through a pressure controlled damper; the combustion air supplied to the burner is filtered. The air inlet to the burner includes a damper that closes automatically when the burner is extinguished, to eliminate heat losses up the flue during furnace standby. Nitric oxide, carbon monoxide, unburned hydrocarbon, and smoke emissions are minimized by the design of the burner and firebox combination. A conventional type burner head is used, rather than a flame retention type, and its choke diameter is related quantitatively to the burner firing rate. In addition, the burner head has oversized, internal, peripheral air swirler vanes. The combustion air fan, an integral part of the burner, draws exterior air into the burner; it is designed to prevent coupling of combustion air flow spikes with combustion noise in the firebox. To reduce flame zone temperature and, thereby, to help minimize nitric oxide emissions, a substantial amount of heat is extracted from the firebox. The firebox is therefore uninsulated and has external radially-extending heat exchange fins in the heated fluid. It is matched in size and shape to the burners in order to optimize the reduction of emissions and of excess air requirements.

REFERENCES:
patent: 353994 (1886-12-01), Walker et al.
patent: 1956603 (1934-05-01), Bailey
patent: 1994184 (1935-03-01), Williams
patent: 2075587 (1937-03-01), Mesinger
patent: 2675865 (1954-04-01), Betzer
patent: 2711683 (1955-06-01), Ryder
patent: 3500814 (1970-03-01), DeLancey
patent: 3906925 (1975-09-01), Dyer
patent: 4038963 (1977-08-01), Dingwall
"Design of an Optimum Distillate Oil Burner for Control of Pollutant Emissions" EPA--650/2--74--047, Jun., 1974.

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