Means for maintaining a non-oxidizing atmosphere at positive pre

Details Means for maintaining a non-oxidizing atmosphere at positive pre Means for maintaining a non-oxidizing atmosphere at positive pre

1979-01-29

1980-07-01

Kendall, Ralph S.

Coating apparatus

With heat exchange, drying, or non-coating gas or vapor...

With housing surrounding or engaging coating means

118 67, 118 69, 118419, 427319, 427321, 148156, 432 8, 432 2, 432 4, 432200, F27B 928, C23C 100

Patent

active

042100976

ABSTRACT:
In a line for coating a ferrous base metal strip with a molten coating metal, the line being of the type having a preparation furnace for the strip comprising a direct fired furnace, a controlled atmosphere heating furnace, one or more cooling chambers and a snout leading beneath the surface of the molten coating metal bath, all in sealed relationship to each other, the improvement comprising a method and means for maintaining a non-oxidizing atmosphere at positive pressure within the entire preparation furnace during line stops. To this end, a retractable, refractory lined door means is provided in the conduit between the direct fired furnace and its exhaust fan to seal off the direct fired furnace from its exhaust fan and an air dilution opening in that conduit. Additionally, means are provided to add excess nitrogen flow to the preparation furnace to maintain a positive pressure therein. Thus, during a line stop, the refractory lined door will be shifted from its normal retracted position to its position sealing off the direct fired furnace and the means for adding excess nitrogen will be actuated to maintain a positive pressure within the entire strip preparation furnace of the metallic coating line.

REFERENCES:
patent: 1890065 (1932-12-01), Meehan
patent: 2711683 (1955-06-01), Ryder
patent: 3222042 (1965-12-01), Fritz
patent: 3396951 (1968-08-01), Cope et al.
patent: 3827854 (1974-08-01), Gildersleeve

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