KR100726416B1 - Cooling unit of electric furnace - Google Patents

Abstract

A device for cooling an electric furnace, which firmly holds the castable, and prevents the castable from being damaged while the device is used, is provided. In an electric furnace cooling device comprising water cooling pipes(10), caps(20) for connecting the water cooling pipes, and anchors(30) installed on outer peripheries of the water cooling pipes, the electric furnace cooling device is characterized in that: the caps are manufactured in a mold by a cold press forging process using a material similar to that of the water cooling pipes; and the anchors are placed in a zigzag shape together with anchors of adjacent water cooling pipes by cutting cylinders of which both ends are opened such that the cylinders are axially cut as much as 90 degrees of an angle, thereby welding the cut cylinders to the water cooling pipes in a predetermined distance such that cut faces of the cylinders face upward.

Description

Furnace Chillers {COOLING UNIT OF ELECTRIC FURNACE}

1 is a plan view showing an electric furnace cooling apparatus according to the present invention

Figure 2 is an exploded perspective view showing the structure of the cap in Figure 1

3A is a perspective view of an anchor

3B is a top view of the anchor

* Explanation of symbols for main parts of drawings *

10: water cooling pipe 20: cap

22: blocking plate 30: anchor

32: bend

The present invention relates to an electric furnace cooling device, and more particularly, to secure the cap connection structure of the water-cooled pipe, and to the castable is firmly supported and in use using a pipe-type anchor cut by a certain angle in the axial direction. The present invention relates to an electric furnace cooling device that prevents breakage of castables.

In the interior of the furnace, a structure for protecting walls or shells of the furnace from high temperature molten steel has been installed. In the past, simply refractory materials have been used, but recently, a cooling apparatus mainly using water-cooled pipes is used.

Looking at the configuration of the above cooling device, first, the cooling water flows and the water cooling pipe made of carbon steel material for high-temperature piping arranged at a predetermined interval, and the cap connecting the plurality of adjacent water cooling pipe ends so that the cooling water flows through the water cooling pipe sequentially; It is composed of an anchor installed on the outer circumference of the water-cooled pipe to attach a castable or slug.

However, since the cap is usually manufactured by casting and then welded with the water-cooled pipe, cracks are advanced in the welding area with bubbles and the water-cooled pipe generated during the casting process, and water is leaked, so that frequent repairs and replacements are performed by the electric furnace. It caused great obstacles to work productivity. In addition, when the above-described cracks are not properly repaired, leaked cooling water flows into the electric furnace, which may cause a great risk of explosion in the electric furnace by electrolyzed hydrogen gas.

In order to solve this problem, the material of the cap is adopted as SS400 (JIS standard of iron and steel) to produce a mold and hot forging, but this is cumbersome, deformation and cracking and pressure There was a problem that the strength was not constant.

In addition, in the case of the anchor, a straight rod is used to be mounted on the outer periphery of the water-cooled pipe in a 'V' type or a 'Y' type, but the anchor has a relatively large thermal expansion rate compared to the castable. There is still a problem in that the stress caused by the difference in expansion coefficient is concentrated at the tip and the castable is cracked or the castable mass is dropped when it is severe.

An object of the present invention for solving the above problems is to firmly support the cap connection structure of the water-cooled pipe, and to support the castable by using a pipe-type anchor cut by a certain angle in the axial direction, and castable in use. An object of the present invention is to provide a cooling device for an electric furnace that does not cause breakage.

A feature of the electric furnace cooling device of the present invention for achieving the above object is an electric furnace cooling device comprising a water cooling pipe, a cap connecting the water cooling pipe and an anchor installed on the outer periphery of the water cooling pipe, wherein the cap is Using a material similar to a water-cooled pipe, it is manufactured by cold press forging in a mold, and the anchor is welded and attached to the water-cooled pipe so that the cylinder whose both ends are open is cut by a predetermined angle in the axial direction and the cut surface is directed upward.

In the above configuration, the end portion attached by welding of the anchor is curved to fit the outer circumferential surface of the water-cooled pipe so as to accurately engage the water-cooled pipe.

An embodiment of the present invention having the features as described above will be described in more detail with reference to the accompanying drawings.

1 is a plan view showing an electric furnace cooling apparatus according to the invention, Figure 2 is an exploded perspective view showing the structure of the cap in Figure 1, Figure 3a is a perspective view of the anchor and Figure 3b is a plan view of the anchor.

The apparatus for cooling an electric furnace according to the present invention includes a plurality of caps 20 and pipes having both sides which are largely arranged with a plurality of water cooling pipes 10 arranged at regular intervals, and press-forged to connect adjacent water cooling pipes 10. It is formed by cutting a predetermined angle in the axial direction and consists of a plurality of anchors 30 which are installed on the outer periphery of the water-cooled pipe 10.

In the above configuration, the cap 20 uses a material similar to that of the water-cooled pipe 10 (for example, according to JIS iron and steel standards, using SB410 used for carbon steel for pressure vessels), and forming a mold to form a cold ( Normal temperature) is produced by press forging, the end of the water-cooled pipe 10 is in close contact with the upper end of the cap so that the cooling water flows to the upper portion is formed so that both sides have dimensions corresponding to the dimensions of the water-cooled pipe (10) The end is first flattened by a lathe, and then faced to have an inclination of 20-40 ° (preferably 30 °), and when the water-cooled pipe is installed, the center space part is blocked by the blocking plate 22. The lower end of the plate 22 faces obliquely symmetrically with the upper end of the cap 20. In addition, the end of the water-cooled pipe 10 is also faced inclined symmetrically with the upper end of the cap (20).

The anchor 30 is attached to the water cooling pipe 10 so that the sides of the cylinder with both ends open are cut by a predetermined angle (90 °) so that the cutting surface is directed upward, the water cooling pipe 10 of the anchor 30 And the attachment portion is formed to be curved to correspond to the outer periphery of the water-cooled pipe 10 to be precisely coupled during the welding operation.

In addition, the anchor 30 is installed at regular intervals, the adjacent water-cooled pipe 10 is installed so that the installation position is zigzag.

Looking at the installation example of the cooling device configured as described above, first, by placing the plurality of water cooling pipe 10 to the upper end of the cap 20, by the inclined end of the water cooling pipe 10 and the inclined end of the cap 20 The water cooling pipe 10 and the cap 20 are welded using the same material as that of the water cooling pipe 10 or the cap 20 to attach the water cooling pipe 10 and the cap 20.

Thereafter, the curved portion 32 of the anchor 30 is in close contact with the outer circumferential surface of the water cooling pipe 10, and then the anchor 30 and the water cooling pipe 10 are welded to install the anchor 30. 30 is arranged on the outer periphery of the water cooling pipe 10 at a predetermined interval.

The cooling device configured as described above is installed in the electric furnace to protect the shell of the electric furnace.

The electric furnace cooling device of the present invention configured as described above is made of a material similar to that of a water-cooled pipe, and only needs to be processed by a flat surface and faced by a lathe after cold press forging. Since cracks and damages are not caused by the difference, safety accidents such as explosion accidents are prevented, and labor and cost are reduced in maintenance.

In addition, by the cold press forging, the cap is economical, high production speed, low machining, good mechanical properties, no oxidation, no decarburization, smooth surface finish, good dimensions and light weight.

In addition, the anchor is formed in a pipe shape with an open upper portion, and thus the supportability of the castable becomes high, and the crack of the castable does not occur due to the difference of the coefficient of thermal expansion during use, and even if the crack occurs, the anchor may cast the castable. There is an effect that does not cause problems such as falling crack lumps.

Claims (3)

In the electric furnace cooling device comprising a water cooling pipe, a cap connecting the water cooling pipe and an anchor provided on the outer circumference of the water cooling pipe, The cap is made by cold press forging in a mold using a material similar to a water-cooled pipe, The anchor is electrically cooled, characterized in that the cylinder with both ends open is cut by 90 ° in the axial direction and welded at regular intervals to the water cooling pipe so that the cutting surface faces upward, and is positioned with the anchor and zigzag of the adjacent water cooling pipe. Device. In the electric furnace cooling device comprising a water cooling pipe, a cap connecting the water cooling pipe and an anchor provided on the outer circumference of the water cooling pipe, The cap is made by cold press forging in a mold using a material similar to a water-cooled pipe, The anchor is welded to the water-cooled pipe so that the cylinder whose both ends are open is cut by a predetermined angle in the axial direction, and the cutting surface is directed upward, and the end attached by welding is connected to the outer circumferential surface of the water-cooled pipe so as to precisely engage with the water-cooled pipe. An electric furnace cooling device, characterized in that the curved shape to fit. According to claim 2, wherein the cap is cold press forged at room temperature and the top end is flattened by a lathe after 20-40 ° inclined, the lower end of the water-cooled pipe is also faced at the same angle, the water-cooled pipe If a plurality of is installed, the space generated in the middle is located in the middle of the face plated block plate, and then welded to the space generated by the surface treatment unit to connect the water-cooled pipe, characterized in that for connecting with the water cooling pipe .

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