SU1213077A1 - Belt-type furnace for annealing metals - Google Patents

Description

The invention relates to designs of bell-type furnaces for the heat treatment of sheet metal coils and can be used in metallurgical and machine-building plants.

The purpose of the invention is to improve the performance of the electric furnace.

Improving the performance of the furnace is provided by a more reliable operation of the gas circulation medium, in which there are no rotating and rubbing parts. The circulation booster allows you to extend the period of the overhaul company of the furnace and, jyieflovely, increase the productivity of the unit.

FIG. 1 shows the koppakov electric furnace, general view; in fig. 2 - a precursor of gas circulation, general view.

Kolpakova electric furnace contains a heating cap 1, lined with refractory plates, on the inside; On its side surface there are tape heaters, metal muffle 2, stand 3 with sand shutters 4, a lined stand 5 is installed on the stand base, on the inner conical surface of which there are rows of strip heaters 6, in the center of the stand there is a circulation booster 7, above the stand on vertical metal posts 8, insulated with ceramic bushings at the locations of electric heaters, a plate 9 is installed with a central channel on which the metal charge is mounted 10, the withdrawal of gas is effected via a conduit 11.

The circulation booster is made in the form of a cylindrical pipe 12, in the upper part of which 13 holes are installed along the perimeter, the total area of which ensures the passage of the estimated amount of gas to the mixer 14. At the entrance to the confuser 15 a nozzle 16 with a gas supply pipeline 17 is installed

 Kolpakova electric furnace works as follows.

A metal cage is installed on the slab (rolls of tape, wire riots) and is closed with a muffle and cap. Through the gas supply pipeline

and the nozzle is supplied with the conditioned gas and the furnace is purged for 1 hour, after which the hood and pendants are turned on. Strut gas exiting nozzle with large

speed, directed through the confuser to the mixer, creating a vacuum before the mixer. Due to this, the kiln gas, the passage above the heater tape heaters located on

the conical surface of the pedestal, is heated and passes through the apertures of the cylindrical pedestal, mixing with the gas stream exiting the nozzle. Obtained in a gas mixer

the mixture, heated to a high temperature, is injected into the center of the metal charge, where it washes the inner surface of the metal and gives it its heat. Then the gas flow, falling down, passes between the outer surface of the cage and the muffle, enters the circulation booster, forming a closed circulation loop. After finishing the heating

the metal switches off the electric heaters of the cap and the cabinets, the cap is removed and the charge is cooled under the muffle. When the cage cools, a gas mixture is injected into its center,

The kotor, having washed the internal surface of the metal, is heated, taking heat from the metal. The passage between the outer surface of the cage and the muffle, the gas gives off heat to the muffle surface and cools down to the circulation booster.

Using the proposed design of a bell electric furnace allows, in comparison with the base object, to obtain a higher unit performance due to higher reliability and design efficiency and, as a result, a decrease in the number and duration of equipment repairs over a selected period of time.

VNIIPI Order 753/38 Circulation 552 Subscription

Branch PPP Patent, Uzhgorod, Proektna St., 4

FIG.

Claims (3)

1. CAPITAL ELECTRIC FURNACE FOR ANNEALING METAL, containing a cap with an electric heater, a muffle, a stand, a cylindrical stand made of refractory material with a vertical axial cylindrical channel on the stand, passing in the upper part into an expanding cone, a gas medium circulation promoter installed in the axial channel, support a plate with a central channel mounted above the pedestal, characterized in that, in order to increase the productivity of the electric furnace, the inducer of circulation of the gas medium is made in the form of a pipe with embarrassment holes in the upper part, ending with a cylindrical mixer, and a central nozzle for supplying gas located in the pipe, while holes are made in the pipe at the level of the nozzle exit. 2. Electric furnace pop. 1, characterized in that the upper end of the mixer is paired with the Central channel of the base plate. 3. An electric furnace according to Claim. 1, which comprises tape heaters on the surface of the channel of the cabinet of the wife.