Metallurgical apparatus – Process
Patent
1996-01-19
1997-08-19
Kastler, Scott
Metallurgical apparatus
Process
266 78, 266103, C21D 1100
Patent
active
056585276
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a method of detection and treatment of fires in a seal means in the comparted entrance and exit of a furnace for continuous thermal treatment of metallic strips and the like, by which in the vicinity of the outside of the seal means provided in each of the comparted entrance and exit using a flammable atmospheric gas having a danger of explosions or fires, such as furnaces for continuous thermal treatment or equipments for continuous painting wherein metallic strips such as stainless steel strips and other alloy steel strips, high alloy strips, copper alloy strips and copper strips are subjected to bright annealing or stress relief annealing without forming an oxide film (such furnaces or equipments being hereinafter referred to as "furnaces for continuous thermal treatment of metallic strips"), the ignition can be quickly detected and treated when the leaked flammable atmospheric gas is ignited by dropping of red hot refractories, spark of static electricity or the like.
BACKGROUND OF THE INVENTION
In furnaces for continuous thermal treatment wherein metallic strips such as stainless steel strips and other alloy steel strips, high alloy strips, copper alloy strips and copper strips are subjected to bright annealing or stress relief annealing without forming an oxide film, when the case of vertical furnaces is concerned and explained, a metallic strip to be thermally treated (such a metallic strip being hereinafter sometimes referred to as "strip") comes into the furnace from a lower portion of the furnace, goes inside the furnace and comes out again from the lower portion of the furnace. For the reason for preventing the oxidation of the strip and other reasons, a flammable gas having a danger of explosions or fires, such as, for example, a hydrogen gas-containing gas, is fed into such a furnace.
Also, in equipments for continuous painting, an organic solvent which generates a flammable gas having a danger of explosions or fires is used in painting compartments of the metallic strip.
In portions of an entrance and an exit through which the strip or the like passes in compartments of such a furnace for continuous thermal treatment and the like, wherein a flammable atmospheric gas having a danger of explosions or fires is used, seal members having various structures and shapes and seal means for shutting off the compartment with flammable atmosphere from outside of the furnace by means of a pad comprising a felt, an elastic rubber or the like in addition to these seal members (such seal means being hereinafter sometimes referred to as "seals") are commonly used in sites held in contact with the strip.
As a representative example of furnaces for continuous thermal treatment and the like, conventionally used general furnaces for bright annealing of stainless steel strips and a seal means provided in the comparted entrance and exit of a furnace body will be hereunder explained.
FIG. 6 is an explanatory drawing of the schematic structure of a conventionally used furnace for bright annealing of stainless steel strips, wherein a strip 1 passes through a seal means 4 provided in the entrance side of a furnace body 2 via a roll 3, comes into the furnace body 2, and passes again through the seal means 4 on the exit side of the furnace body 2 when comes out. The furnace is operated in such a manner that in order to prevent the formation of an oxide film when the passing strip 1 is heated and subjected to annealing, a hydrogen gas-containing reducible flammable atmospheric gas 10, such as a gas comprising 75% of H.sub.2 and 25% of N.sub.2, is always fed into the furnace body 2, and the furnace pressure is kept at from about 10 to 50 mmH.sub.2 O higher than atmospheric pressure outside of the furnace, so that the flammable atmospheric gas 10 fed into the furnace body 2 leaks out gradually into outside air from the seal means 4 provided in the exit side and the entrance side.
The seal means 4 provided in the exit side and the entrance side in the comparted state in su
REFERENCES:
patent: 2367174 (1945-01-01), Renkin
patent: 3291468 (1966-12-01), Albertsen et al.
patent: 3306594 (1967-02-01), Bauer
Kastler Scott
Nisshin Steel Co. Ltd.
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