KR100899358B1 - Method of carrying out supporting structure for bustil pipe - Google Patents

Abstract

It is an object of the present invention to provide an annular tube support structure and a construction method thereof that can greatly shorten the overall blast furnace refurbishment process to minimize the interruption of molten iron production. To this end, in the present invention, a box girder including pillars installed in the vertical direction and a box beam connecting the upper portion of the pillars, the girder is installed around the blast furnace; A tension rod that connects the box girder and the hanger bracket surrounding the annular tube to fix the annular tube to the box girder; And a stabilizer rod connecting the neighboring pillars of the box girder and the annular tube to block vibration of the annular tube.

Annular building, blast furnace renovation, air shortening

Description

Method of carrying out supporting structure for bustil pipe}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing a bust pipe support structure, and more particularly, a blow pipe which is disposed around a blast furnace for producing molten iron and injects hot air into the blast furnace during operation. It is related with the construction method of the support structure which supports the annular tube which functions to supply hot air to air. Here, molten iron means the process of obtaining molten pig iron or its molten pig iron. However, the present invention relates to a support annular support structure and a construction method which are advantageous for shortening the air in the construction or renovation of the blast furnace in which the process is performed, rather than directly related to the process for producing molten iron.

As shown in Figure 1, in general, the blast furnace operation charges the charge (iron ore and coke) into the furnace from the top of the blast furnace, and blows high temperature hot air through the air vent 110f installed in the furnace bottom to reduce melting in the furnace The reaction produces a molten iron.

In this process, the iron ore and coke 114 charged into the blast furnace 50 is lowered to the lower part of the furnace according to the coke 114 combustion and the reduced melting of the iron ore from the lower part of the furnace or frictional action with the internal furnace smoke generated from the bottom of the coke. Gas generated during the combustion and melt reduction process of iron ore rises to be discharged to the upper part of the blast furnace, and is damaged by the refractory smoke installed inside the blast furnace (50) due to chemical erosion reaction generated at the contact with the furnace lead and the surface. do.

If the damage to the refractory smoke persists, the blast furnace will reach its end of life and at some point, the blast furnace will be suspended for static reconstruction. If the blast furnace operation is stopped, the production of molten iron in the blast furnace will be stopped, so shortening the period is a very important task for the molten iron producer. This blast furnace refurbishment process is accompanied by renovation work of the annular tube disposed around the bottom of the blast furnace. The renovation of the annular tube should be carried out in conjunction with the refurbishment work inside and outside the blast furnace, and there is a great need for the development of an annular tube construction method that can shorten the overall refurbishment schedule.

An object of the present invention is to provide a construction method of an annular tube support structure that can greatly shorten the overall blast furnace renovation process to minimize the interruption of the production of molten iron.

The object of the present invention as described above,

The object of the present invention as described above, in the method for constructing an annular tube around the blast furnace,

delete

delete

delete

Installing a hanger bracket on a portion of the annular tube piece to be installed and installing a lift lug on the entire annular tube piece to be installed;

(B) lifting the annular tube piece having the hanger bracket installed thereto by connecting a wire rope to the lift lug;

(C) connecting and fixing the hanger bracket and the box girder of the lifted annular tube piece with a tension rod which can be adjusted in length;

(D) lifting the annular tube piece provided with only the lift lug in the step (a) and welding the annular tube pieces fixedly connected to the box girder in step (c); And

(E) installing a stabilizer rod whose both ends are fixed to two adjacent pillars of the box girder, the center portion of which is in contact with the annular tube,

In step (a),

Half of the annular pieces to be installed are equipped with two hanger brackets.

In the annular piece with hanger brackets, one lift lug is installed by welding,

In the annular piece without hanger brackets, two lift lugs are installed by welding,

In step (b),

delete

Lifting work is done by winch or crane,

In step (c),

The tension rod is installed to penetrate the lower end from the top of the box girder, two or more are used to connect the hanger bracket and the box girder,

Length adjustment of the tension rod is made by the rotation of a nut that fixes the tension rod at the top of the box girder,

In step (d),

The annular piece fixedly connected to the box girder is welded after adjusting the length and tension of the tension rod,

In step (d),

The annular piece provided with only lift lugs is achieved by providing an annular construction method which is lifted by position with wire rope wrapped around two pulleys spaced a predetermined distance and the distance therebetween can be adjusted.

Here, in step (e), it is also possible to adjust the height and balance of the annular pipe pieces provided with only lift lugs by adjusting the distance between the pulleys.

In this case, each of the blower tubes may be further lifted and welded to the annular tube.

According to the present invention, during the expansion or renovation of the blast furnace, it is possible to simultaneously proceed with the step of constructing the outer shell of the blast furnace and the process of constructing the annular tube around the blast furnace, thereby significantly shortening the air. As a result, it is possible to drastically reduce the downtime of blast furnaces, which require periodic refurbishment, thereby drastically reducing the loss of charter production during periods when the blast furnace is not in operation.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention.

FIG. 2 is a cross-sectional view schematically showing the annular support structure according to the present invention, FIG. 3 is a plan view of the annular tube viewed from the IV-IV direction of FIG. 2, and FIG. 4 is the VV direction of FIG. 2. A plan view of the transverse beams of the box girder is shown, and a stabilizer rod is shown in FIG. 5.

As shown in the figure, the annular tube support structure according to the present invention includes a box girder assembly 10, a tension rod 20 and a stabilizer rod 40 supporting the annular tube 30.

The box girder assembly 10 includes four pillars 10b installed in the vertical direction and four horizontal beams 10a connecting the upper portions of the pillars 10b and are installed around the blast furnace 50. The box girder assembly 10 may further be provided with four auxiliary beams 10c that diagonally connect neighboring horizontal beams to each other. Two tension rod fixing brackets 10d are installed on the auxiliary beams 10c, respectively, and the tension rods 20 are connected to each other.

The tension rod 20 functions to support the annular tube 30 to the auxiliary beam 10c of the box girder, and connects the auxiliary beam 10c to the hanger bracket 25 surrounding the annular tube. . The hanger bracket 25 entirely surrounds the circumference of the annular tube. In FIG. 2, the tension rods 20 are illustrated as being connected to the horizontal beam 10a. However, the auxiliary beam 10c is not shown from the perspective of FIG. The bracket 10d of 10c is engaged in the installed position.

As shown in FIG. 3, the stabilizer rod 40 connects the pillar 10b of the box girder, the annular tube 30 and the other pillar 10b of the box girder to each other. A connection bracket is further installed at a portion of the annular tube 30 connected to the stabilizer rod 40 so that one end portion 41 of the stabilizer rod 40 is fixed to the pillar 10b and the other end portion 41 '. ) May be fixed to the annular tube. Alternatively, unlike those shown in FIG. 3, both ends of the stabilizer rod 40 may be fixed to neighboring pillars 10b, and the turnbuckle portion 42 of the stabilizer rod may be connected to the annular tube.

The stabilizer rod 40 may be made in the form of a turnbuckle as shown in FIG. 5 and used to center the annular tube while rotating the central turnbuckle portion.

The stabilizer rod 40 serves to block vibrations that swing in the left and right directions in the structure in which the tension rods 20 hold the annular tube 30 from above.

6 shows an annular support structure of a comparative example for explaining the advantages of the annular support structure of the present invention.

As shown in FIG. 6, the annular support structure of the comparative example includes a support beam 60 for supporting the annular tube 30 from below. The support beam 60 is made in the form of a table connected to the blast furnace 50 body, and may include a horizontal portion 62, a reinforcement portion 63, and a support portion 61. The support portion may be formed in a concave shape in the center portion corresponding to the circular cross section of the annular tube.

On the other hand, after the blast furnace has reached a certain life, the refurbishment work of the blast furnace newly replaces the refractory (not shown) inside the blast furnace and the shell (not shown) outside the blast furnace and replaces the annular tube. In the support structure of this comparative example, the installation work of the annular tube cannot be performed until the process of dismantling the existing bark and constructing a new bark is completed. Therefore, the entire blast furnace repair process will be long. The blast furnace repair period is a period in which the blast furnace is not used, and a delay of only a few days may not allow the steelmakers to produce molten iron, which can lead to huge losses. On the other hand, when applying a support structure that can be constructed separately from the shell construction, such as the annular support structure according to the present invention can increase the production period of the molten iron can be minimized the loss. Therefore, compared with the case of using the structure of a comparative example, it is said that the annular support structure of this application is a breakthrough structure which can shorten a blast furnace repair process significantly.

Hereinafter, the method of constructing the annular support structure of the present invention will be described.

Basically, the installation of the annular tube is made by manufacturing the annular tube into several pieces (for example, eight pieces) and welding them together. Therefore, the following work is made in preparation for this.

A hanger bracket is installed on a part of the annular tube piece to be installed, and a lift lug is installed on the whole annular piece to be installed. This process is a preparation for lifting the annular tube piece. In case of eight annular tube pieces to be installed, four of the annular tube pieces to be installed are provided with two hanger brackets and an annular tube piece with the hanger bracket installed. One lift lug is provided by welding in the case, and two lift lugs are installed by welding in the annular pipe piece which is not provided with the hanger bracket, and the lift lug is installed by welding in the annular pipe piece.

When the above preparation is completed, the salvage pipe hanger bracket is then lifted by connecting a wire rope to the lift lug. The lifting operation can be done by winch or crane.

When the lifting of the annular tube piece with hanger bracket is completed, the hanger bracket of the lifted annular tube piece and the box girder are connected and fixed by a tension rod which can be adjusted in length. The tension rod is installed penetrating the lower end from the top of the box girder, two or more are used to connect the hanger bracket and the box girder, the length adjustment of the tension rod to fix the tension rod at the top of the box girder It can be done by the rotation of the nut.

Next, the annular pipe piece, which has been previously installed only with the lift lug, is lifted, and the annular pipe is completed by welding the annular pipe pieces lifted and fixed to the box girder first. The annular piece fixedly connected to the box girder adjusts the height and balance by adjusting the length of the tension rod, and the newly lifted annular piece is adjusted by height and balance with a crane used for lifting and then welded. do.

Next, a stabilizer rod is used to connect the pillars of the box girder to the annulus. After the connection of the stabilizer rod is completed, each of the blower tubes is lifted and welded to the annular tube.

In order to apply the construction method described above to the blast furnace renovation process, the following annular pipe demolition step should basically be included.

The annular pipe dismantling step marks the part to be cut on the annular tube to be removed, installs a lift lug at the center of each cut portion of the annular tube, and supports the annular tube to be cut by connecting a wire rope to the lift lug. The cutting of the annular tube may be performed by descending and removing the cut annular piece.

In the following description of the present invention, the embodiments illustrated in the drawings have been described with reference to the embodiments, which are merely exemplary, and various modifications and equivalent other embodiments of the present invention may be made by those skilled in the art. I will understand the point. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

1 is a cross-sectional view schematically showing the inside of the blast furnace and the position of the annular tube during normal blast furnace operation.

2 is a cross-sectional view showing an annular tube support structure according to the present invention.

3 is a plan view of the annular tube seen from the IV-IV direction of FIG.

4 is a plan view of the box girder seen in the V-V direction of FIG. 2;

5 is a diagram showing a configuration of a stabilizer rod.

6 is a cross-sectional view showing an annular support structure of a comparative example.

<Explanation of symbols for the main parts of the drawings>

10: box girder assembly 10a: box girder horizontal beam

10b: box girder pillar 10c: box girder auxiliary beam

10d: Tension rod fixing bracket 20: Tension rod

25: hanger bracket 30: annular tube

30a, 30b, 30c, 30d, 30e, 30f, 30g, 30h: annular piece

31: blowing branch connecting part 32: annular tube welding line

33: ventilation branch 40: stabilizer road

41, 41 ': Rod end 42: Turnbuckle section

50: blast furnace 110a: melt

110b: exit 110c: soft fusion zone

110f: blowhole 113: bottom of the bottom

114: coke

Claims (4)

delete In the method of constructing the annular tube 30 around the blast furnace 50, Installing a hanger bracket (25) on a portion of the annular tube piece to be installed and installing a lift lug on the entire annular tube piece to be installed; (B) lifting the annular tube piece having the hanger bracket installed thereto by connecting a wire rope to the lift lug; (C) connecting and fixing the hanger bracket 25 and the box girder of the lifted annular tube piece with a tension rod 20 whose length is adjustable; (D) lifting the annular tube piece provided with only the lift lug in the step (a) and welding the annular tube pieces fixedly connected to the box girder in step (c); And (E) installing a stabilizer rod 40 whose both ends are fixed to two neighboring pillars of the box girder, the center portion of which is in contact with the annular tube, In step (a), Half of the annular pipe pieces to be installed are provided with two hanger brackets (25), One lift lug is installed by welding on the annular pipe pieces 30a, 30b, 30c, 30d provided with the hanger bracket 25, In the annular tube pieces 30e, 30f, 30g, 30h without the hanger bracket 25 installed, two lift lugs are installed by welding, In step (b), Lifting work is done by winch or crane, In step (c), The tension rod 20 is installed to penetrate the lower end from the top of the box girder, two or more are used to connect the hanger bracket and the box girder, The length adjustment of the tension rod 20 is made by the rotation of a nut fixing the tension rod 20 at the top of the box girder, In step (d), An annular piece fixedly connected to the box girder is welded after adjusting the height and balance by adjusting the length of the tension rod 20, In step (d), The annular pipe piece provided with only the lift lug is lifted by a winch or a crane with the wire rope encircling the outside of two pulleys which can be separated by a predetermined distance and which can adjust the distance therebetween. The method of claim 2, In the step (e), the height and balance of the annular pieces (30e, 30f, 30g, 30g) installed only the lift lug by adjusting the distance between the pulleys. The method of claim 2, Lifting the blower pipes (33), respectively, and welded to the annular pipe installation step further comprising the step of installing.

Images