Method for reducing the volume of atmosphere needed to inhibit i

Details Method for reducing the volume of atmosphere needed to inhibit i Method for reducing the volume of atmosphere needed to inhibit i

1984-04-30

1985-11-05

Camby, John J.

Heating

Processes of heating or heater operation

Controlling flame position or work atmosphere

432 64, 432198, F27B 904, F27B 504, F27D 700

Patent

active

045510911

ABSTRACT:
The volume of atmosphere needed to inhibit the ingress of ambient oxygen into the furnace chamber (3) of a continuous heat treatment furnace (1) can be reduced by introducing a gas containing free oxygen (e.g. air) into the entrance section (2) and/or exit section (4) adjacent the roof thereof. Thus a relatively inexpensive gas may often be used in combination with an expensive atmosphere thereby significantly reducing overall process cost. Continuous heat treatment furnaces can readily be converted to perform the method by simply inserting adjacent the roof of the entrance and/or exit section a tube (3) having a slot and/or a plurality of downwardly facing holes (9) and connecting the tube to a supply of the requisite gas. The invention is applicable to both double open ended furnaces and continuous furnaces in which the exit section is filled with a liquid, e.g. oil or molten salt. In these latter cases the gas is introduced in the entrance section (2).

REFERENCES:
patent: 1725059 (1929-08-01), Colby
patent: 1851831 (1932-03-01), Hayes
patent: 2253897 (1941-08-01), Doderer
patent: 3575398 (1971-04-01), Lincoln et al.

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