KR20140101931A - Cooling unit of electric furnace - Google Patents

Cooling unit of electric furnace Download PDF

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Publication number
KR20140101931A
KR20140101931A KR1020130015121A KR20130015121A KR20140101931A KR 20140101931 A KR20140101931 A KR 20140101931A KR 1020130015121 A KR1020130015121 A KR 1020130015121A KR 20130015121 A KR20130015121 A KR 20130015121A KR 20140101931 A KR20140101931 A KR 20140101931A
Authority
KR
South Korea
Prior art keywords
water
cooled pipe
cap
electric furnace
anchor
Prior art date
Application number
KR1020130015121A
Other languages
Korean (ko)
Inventor
이상만
김현곤
Original Assignee
순천향대학교 산학협력단
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 순천향대학교 산학협력단 filed Critical 순천향대학교 산학협력단
Priority to KR1020130015121A priority Critical patent/KR20140101931A/en
Publication of KR20140101931A publication Critical patent/KR20140101931A/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B3/00—Hearth-type furnaces, e.g. of reverberatory type; Tank furnaces
    • F27B3/10—Details, accessories, or equipment peculiar to hearth-type furnaces
    • F27B3/24—Cooling arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D11/00—Arrangement of elements for electric heating in or on furnaces
    • F27D11/08—Heating by electric discharge, e.g. arc discharge
    • F27D11/10—Disposition of electrodes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D9/00—Cooling of furnaces or of charges therein
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/52—Manufacture of steel in electric furnaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D9/00—Cooling of furnaces or of charges therein
    • F27D2009/0002—Cooling of furnaces

Abstract

The present invention relates to an electric furnace cooling device, and an electric furnace cooling device including a cap connecting a water-cooled pipe and a water-cooled pipe and an anchor provided on the outer periphery of the water-cooled pipe, wherein the anchor includes a cylindrical portion And a circular plate portion formed at a distal end of the cylindrical portion with a diameter larger than the diameter of the cylindrical portion.
By using the electric furnace cooling device as described above, the present invention is characterized in that the water-cooled pipe and the cap are firmly fixed, and a plurality of anchors are provided on the outer periphery of the water-cooled pipe to attach and remove the slag included in the molten steel to the anchor.

Description

{COOLING UNIT OF ELECTRIC FURNACE}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric furnace cooling apparatus, and more particularly, to an electric furnace cooling apparatus for solidifying a cap connecting structure of a water-cooled pipe and attaching and removing slag in an electric furnace.

Inside the electric furnace, a structure for protecting the wall or the iron fiber of the electric furnace from the high-temperature molten steel was installed. In the past, the refractory was simply used, but in recent years, a cooling device using mainly a water-cooled pipe has been used.

Conventionally, an electric furnace cooling apparatus includes a water-cooled pipe of carbon steel material for high-temperature piping which is arranged at regular intervals with cooling water flowing therein, a cap which connects the plurality of adjacent water-cooling pipe ends so that the cooling water can flow sequentially through the water- And an anchor that is installed to allow the castable or slag to be attached.

Since the cap is manufactured through the casting process and then welded with the water-cooled pipe, cracks are developed on the welded portion between the bubbles generated in the casting process and the water-cooled pipe and water is leaked. Therefore, And replacement work has caused a great deal of work productivity in the electric furnace.

Therefore, in the conventional electric furnace cooling apparatus, when cracks and the like of the cap are not properly repaired, the leaked cooling water is introduced into the electric furnace, and the electrolytic hydrogen gas causes an explosion inside the electric furnace.

On the other hand, the anchor is used by attaching a straight rod to the outer circumference of the water-cooled pipe as 'V' type or 'Y' type by welding.

However, since the thermal expansion rate of the anchor is relatively larger than that of the castable, there is a problem that cracks are generated in the castable due to the difference of the expansion coefficient due to the difference in expansion coefficient at the tip of the anchor, or the castable lumps fall off in severe cases.

An example of a technique for solving such a problem is disclosed in Korean Patent Registration No. 10-0726416 (published on June 14, 2007, hereinafter referred to as Patent Document 1).

FIG. 1 is a plan view of an electric furnace cooling apparatus according to Patent Document 1, FIG. 2 is an exploded perspective view of the cap shown in FIG. 1, and FIG. 3 is a perspective view of the anchor shown in FIG.

1 to 3, an electric furnace cooling apparatus according to Patent Document 1 includes a water-cooled pipe 1 in which a plurality of water-cooled pipes 1 are arranged at regular intervals, a plurality of caps (not shown) (2), and a plurality of anchors (3) formed by cutting a pipe having both sides open at a predetermined angle in the axial direction and provided on the outer periphery of the water-cooled pipe (1).

The cap 2 is made of a material similar to the water-cooled pipe 1 by cold forging (at room temperature), and the end of the water-cooled pipe 1 is in close contact with the upper end of the cap 2, And both sides thereof are formed to have dimensions corresponding to those of the water-cooled pipe 1.

 The anchors 3 are attached to the water-cooled pipe 1 such that the side faces of the cylindrical openings of both ends are cut by a predetermined angle (90 DEG) The attaching portion is formed to be curved so as to correspond to the outer periphery of the water-cooled pipe (1), so that it is precisely coupled during the welding work.

The electric furnace cooling device according to Patent Document 1 having the above-described structure uses the cap 2 as a material similar to the water-cooled pipe 1, and thus prevents cracks or breakage due to a difference in thermal expansion coefficient during use, .

However, in the electric furnace cooling apparatus according to the patent document 1, when the water-cooled pipe 1 is installed, as shown in Fig. 2, the central space portion is blocked by using the shutoff plate 4. [

At this time, the cross section of the water-cooled pipe 1 is circular, but the shape of the space partly shielded by the shield plate 4 is formed in a distorted circular shape on the side of the shield plate 4 so that the gap between the cap 2 and the water- The cooling water leaks through the space, and the leaked cooling water flows into the electric furnace, causing the explosion inside the electric furnace due to the electrolyzed hydrogen gas.

On the other hand, slag occurs in the process of dissolving and melting metal in the electric furnace, and this slag changes the composition of molten steel and deteriorates the quality of the product.

Therefore, as shown in FIG. 3, in the electric furnace cooling device according to Patent Document 1, slag is attached to a space formed by cutting a side of a cylindrical anchor 3 by a predetermined angle to remove slag, .

However, in the electric furnace cooling apparatus according to Patent Document 1, since the slag is not sufficiently introduced through the cut portion of the anchor 3, the slag can not be sufficiently removed, and the slag attached to the inside of the anchor 3 There is a problem that a lot of time and efforts are required to be removed.

Korean Patent Registration No. 10-0726416 (published on June 14, 2007)

SUMMARY OF THE INVENTION It is an object of the present invention to provide an electric furnace cooling device for preventing the outflow of cooling water by firmly connecting a water-cooled pipe and a cap.

Another object of the present invention is to provide an electric furnace cooling device capable of attaching and removing slag contained in molten steel.

According to an aspect of the present invention, there is provided an electric furnace cooling apparatus including a cap connecting a water-cooled pipe and a water-cooled pipe, and an anchor provided on an outer periphery of the water-cooled pipe, A cylindrical portion formed in a cylindrical shape and an original portion formed at a tip end of the cylindrical portion with a diameter larger than the diameter of the cylindrical portion.

And the cylindrical portion has a curved surface formed on the surface contacting with the water-cooled pipe so as to be bent so as to correspond to the outer periphery of the water-cooled pipe.

And the curved surface is welded to only two points corresponding to the outer circumference of the water-cooled pipe.

The cap includes a pair of circular spaces spaced apart from each other by a predetermined distance so that a pair of the water-cooled pipes are coupled to each other, and a blocking plate is coupled between the upper surfaces of the pair of circular spaces.

Wherein a curved surface corresponding to the outer periphery of the water-cooled pipe is formed on both sides of the blocking plate, and curved surfaces are formed on the upper and lower sides of the blocking plate in a shape corresponding to the upper surface of the cap.

As described above, in the present invention, a plurality of anchors are provided on the outer periphery of the water-cooled pipe, and the slag included in the molten steel is attached to and removed from the anchors.

That is, according to the present invention, a disk portion is formed on the outer periphery of the water-cooled pipe at a tip end of the cylindrical portion with a larger diameter than the cylindrical portion, thereby widening the attachment area of the slag, thereby improving the removal efficiency of the slag.

According to the present invention, a pair of circular spaces are formed on an upper surface of an inner space of a cap so as not to overlap with each other, and the upper surface of the inner space of the cap is shielded by engaging a shield plate formed in a shape corresponding to an end surface of the water-

Accordingly, the present invention can firmly fix the water-cooled pipe and the cap, and stably prevent the cooling water from leaking into the electric furnace.

Further, according to the present invention, since the cap is formed of a similar material having the same thermal expansion coefficient as that of the water-cooled pipe, it is possible to prevent a crack due to a difference in thermal expansion coefficient between the water-

1 is a plan view of an electric furnace cooling apparatus according to the prior art;
Figure 2 is an exploded perspective view of the cap shown in Figure 1;
3 is a perspective view of the anchor shown in Fig.
4 is a plan view of an electric furnace cooling apparatus according to a preferred embodiment of the present invention.
5 is a cross-sectional view of the cap shown in Fig.
6 and 7 are a perspective view and a cross-sectional view of the anchor shown in Fig.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an electric furnace cooling apparatus according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 4 is a plan view of an electric furnace cooling apparatus according to a preferred embodiment of the present invention, FIG. 5 is a sectional view of the cap shown in FIG. 4, and FIGS. 6 and 7 are a perspective view and a sectional view of the anchor shown in FIG.

Generally, the electric furnace is formed into a cylindrical shape with one side opened, and one side of the electric furnace which is opened is shielded by using a disc-shaped lid.

As shown in FIG. 4, the electric furnace cooling apparatus according to the present invention includes a plurality of water cooling pipes 10 arranged in a lid to be installed at regular intervals and having an electric furnace and cooling water moving therein to cool the molten steel A cap 20 connecting the water-cooled pipes 10 adjacent to each other, and a plurality of anchors 30 installed on the outer periphery of the water-cooled pipe 10. [

The cap 20 is cast using a material similar to the water-cooled pipe 10, for example, JIS steel and steel for use in carbon steel for pressure vessels, heated to 900 DEG C or higher, Forging and cold forging at room temperature.

The ends of the pair of water-cooled pipes 10 are coupled to the cap 20 and the cooling water flows from one of the water-cooled pipes 10 to the next water-cooled pipe 10 via the internal space of the cap 20 .

For this purpose, the cap 20 is formed into a semi-disc shape having an approximately open upper surface as shown in Fig.

More specifically, the cap 20 has a substantially semicircular cross-section with respect to the line A-A, and the upper surface of the cap 20 has a shape in which two non-overlapping circles are connected by a pair of straight lines when viewed from above.

That is, the upper surface of the inner space of the opened cap 20 is separated into two circular spaces 21 and 22 by the shutoff plate 23, and the water-cooled pipe 10 is connected to the circular spaces 21 and 22 Welded.

Curved surfaces 24 are formed on both sides of the blocking plate 23 in a shape corresponding to the outer periphery of the water-cooled pipe 10 and upper and lower sides of the blocking plate 23 are formed in a shape corresponding to the opening of the cap 20, 25 are formed.

The blocking plate 23 is formed such that the distance between the pair of curved surfaces 24 is slightly larger than the distance between the pair of water-cooled pipes 10 connected by the cap 20, The distance between the upper and lower ends of the upper surface of the inner space of the corresponding cap 20 is formed to be slightly larger than the distance between the upper and lower ends of the corresponding upper surface of the inner space of the cap 20.

Of course, the blocking plate 23 may be formed to have a size corresponding to the size of the opening of the cap 20, or may be formed larger than the opening of the cap 20, and then welded to the upper end of the cap 20.

On the other hand, the inner space front end face of the water-cooled pipe 10 and the end faces of the circular spaces 21 and 22 of the cap 20 are formed into circular shapes of the same diameter so as to smoothly move the cooling water and are connected by welding.

In order to smoothly perform the welding operation, it is preferable that the opposite ends of the water-cooled pipe 10 and the cap 20 are flatly machined by a lathe, and then are symmetrically positioned so as to have an inclination of about 20-40 °.

The anchor 30 is installed on the outer periphery of the water-cooled pipe 10 to attach and remove the slag included in the molten steel.

6, the anchor 30 includes a cylindrical portion 31 formed in a cylindrical shape and a circular plate portion 32 integrally formed at the tip of the cylindrical portion 31. [

The cylindrical portion 31 has a curved surface 33 formed on one side of the water-cooled pipe 10 so as to be bent to correspond to the outer periphery of the water-cooled pipe 10.

The cylindrical portion 31 may be formed in a cylindrical shape, but it is preferable to reduce the manufacturing cost of the component by reducing the amount of material required when the anchor 30 is formed by forming a space in a cylindrical shape.

The disc portion 32 is formed larger than the diameter of the cylindrical portion 31 to increase the attachment area of the slag.

The anchor 30 is welded to the outer periphery of the water-cooled pipe 10 so that the anchor 30 is separated from the water-cooled pipe 10 after the slag is attached to the curved surface 33 so as to easily remove the slag. It is preferable that only two points symmetrical to each other are welded to the outer periphery of the water-cooled pipe 10.

The anchors 30 are spaced apart from each other by a predetermined distance so as to prevent the anchors 30 from being connected while the slag is attached to the anchors 30 installed in the adjacent water- It is preferable to be installed so as to stagger the installation position of the anchor 30 installed in the adjacent water-cooled pipe 10.

Accordingly, in the present invention, a plurality of anchors including a cylindrical portion and a circular plate portion are provided on the outer circumferential surface of the water-cooled pipe, and slag included in the molten steel can be attached and removed.

According to another aspect of the present invention, a pair of circular spaces are formed on an upper surface of an inner space of a cap so as not to overlap with each other, and the upper surface of the inner space of the cap is welded by inserting a shield plate formed in a shape corresponding to an end surface of the water-

Accordingly, the present invention can firmly fix the water-cooled pipe and the cap, and stably prevent the cooling water from leaking into the electric furnace.

Next, the coupling relationship of the electric furnace cooling apparatus according to the preferred embodiment of the present invention will be described.

A water cooling pipe 10 is coupled to each of the pair of circular spaces 21 and 22 formed in the inner space of the cap 20 and then between the upper surfaces of the pair of circular spaces 21 and 22, So as to shield the space between the pair of water-cooled pipes 10.

At this time, the water-cooled pipe 10 coupled to the circular spaces 21 and 22 of the cap 20 and the cap 20 is firmly fixed by the engagement of the blocking plate 23 and then the cap 20 and the water- 10 and the shield plate 23 are welded.

Accordingly, it is possible to prevent the cooling water from leaking through the space between the water-cooled pipe and the cap, thereby preventing a safety accident such as an explosion due to the inflow of the cooling water into the electricity.

Also, according to the present invention, since the cap is formed of a similar material having the same thermal expansion coefficient as that of the water-cooled pipe, it is possible to prevent a crack due to a difference in thermal expansion coefficient between the water-

Next, the anchor 30 is welded to the outer periphery of the water-cooled pipe 10.

At this time, the anchor 30 is installed at a predetermined distance from the anchor 30 installed in the same water-cooled pipe 10 so as to prevent the anchors 30 from sticking together with the slag between the adjacent anchors 30 And is provided so as to be staggered with the installation position of the anchor 30 installed in the adjacent water-cooled pipe 10.

The anchor 30 is installed by welding only two points symmetrical to each other on the curved surface 33 so that the anchor 30 can be easily separated from the outer periphery of the water-cooled pipe 10 during welding.

Of course, when the slag attached to the anchor 30 is removed in a state where the anchor 30 is installed on the outer periphery of the water-cooled pipe 10 without separating the anchor 30, the anchor 30 is moved along the outer periphery of the curved surface 33 10 as a whole.

Accordingly, in the present invention, an original plate portion having a diameter larger than the diameter of the cylindrical portion is formed at the tip end of the cylindrical portion of the anchor to widen the attachment area of the slag, thereby increasing the removal efficiency of the slag.

Next, a method for removing slag in an electric furnace cooling apparatus according to a preferred embodiment of the present invention will be described in detail.

As the molten steel is being melted and cooled, the slag contained in the molten steel is attached to the plurality of anchors 30 provided on the water-cooled pipe 10.

Then, after the cooling process is completed, the anchor 30 is removed from the water-cooled pipe 10 to remove the slag attached to the anchor 30.

However, in the present invention, the anchor 30 must not necessarily be separated from the water-cooled pipe 10, and the slag attached to the anchor 30 may be removed in a state where the water-cooled pipe 10 is installed.

If the anchor 30 is separated, the slag may be removed and welded to the water-cooled pipe 10 again.

On the other hand, when the anchor 30 is not separated, it is preferable that the anchor 30 is integrally welded to the outer periphery of the water-cooled pipe 10 along the curved surface 33 of the cylindrical portion 31.

Through the above-described process, the water-cooled pipe and the cap are firmly fixed, and a plurality of anchors are installed on the outer periphery of the water-cooled pipe to attach and remove the slag included in the molten steel to the anchor.

The scope of the present invention is not limited to the embodiments described above, but may be defined by the scope of the claims, and those skilled in the art may make various modifications and alterations within the scope of the claims It is self-evident.

10: water-cooled pipe 20: cap
21, 22: circular space 23:
24: curved surface 25: curved surface
30: anchor 31: cylindrical portion
32: original plate portion 33: curved surface

Claims (5)

An electric furnace cooling apparatus comprising a cap connecting a water-cooled pipe and a water-cooled pipe, and an anchor provided on an outer periphery of the water-cooled pipe,
The anchor
A cylindrical portion formed in a cylindrical shape
And a disk portion formed at a tip end of the cylindrical portion with a diameter larger than the diameter of the cylindrical portion. 2. The apparatus of claim 1, wherein the cylindrical portion
And a curved surface formed on the surface contacting the water-cooled pipe so as to be bent so as to correspond to the outer periphery of the water-cooled pipe. 3. The apparatus of claim 2, wherein the curved surface
Wherein only two points corresponding to each other are welded to the outer periphery of the water-cooled pipe. 4. The cap according to any one of claims 1 to 3,
A pair of circular spaces spaced apart from each other by a predetermined distance so as to couple a pair of the water-cooled pipes,
And a shield plate is coupled between the upper surfaces of the pair of circular spaces. 5. The method of claim 4,
On both sides of the blocking plate, a curved surface corresponding to the outer periphery of the water-cooled pipe is formed,
Wherein a curved surface is formed on the upper and lower sides of the blocking plate in a shape corresponding to the upper surface of the cap.
KR1020130015121A 2013-02-13 2013-02-13 Cooling unit of electric furnace KR20140101931A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020130015121A KR20140101931A (en) 2013-02-13 2013-02-13 Cooling unit of electric furnace

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020130015121A KR20140101931A (en) 2013-02-13 2013-02-13 Cooling unit of electric furnace

Publications (1)

Publication Number Publication Date
KR20140101931A true KR20140101931A (en) 2014-08-21

Family

ID=51746995

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020130015121A KR20140101931A (en) 2013-02-13 2013-02-13 Cooling unit of electric furnace

Country Status (1)

Country Link
KR (1) KR20140101931A (en)

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