JPS58161712A - Method and device for relining of wall of blast furnace - Google Patents

Abstract

PURPOSE:To reline the walls of a blast furnace easily and safely in relining the walls of the blast furnace in the stage of blowing out, by leaving a top charger intact, installing supporting beams horizontally in the furnace port with the materials inserted through the manhole, and inserting a working deck into the furnace through the tuyere opening. CONSTITUTION:In relining the walls of a blast furnace in the stage of blowing out, a raw material charger 1 at the furnace top is held intact and a stationary deck 2 is installed in the furnace port with the materials brought therein through the manhole at the furnace top. Assembling members for an operating deck 6 and a gnodola 9 are mounted to a working deck 11 and are introduced into the furnace through the opening 17 at the tuyere level. The deck 11 is hoisted with the deck 2 and is stopped temporary thereto, then the deck 6 mounted on the deck 11 is fixed to the deck 2. The gondola 9 is also suspended from the deck 2 freely movably upward and downward. Finally, the deck 11 is mounted to the deck 2 movably upward and downward, and the temporary stopping is released. The workers ride on the deck 11 and reline the walls in the blast furnace.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and device for repairing blast furnace walls, and in particular, the method and device are aimed at shortening the repair period during blast furnace blowdown and maintaining the integrity of the work. Regarding ゛.

When repairing a blast furnace during blowdown.

After blowing off, holes are installed at the level of the blast furnace tuyeres, and the contents at the top are scraped out to leave the furnace in an empty state. However, under such conditions, the inside of the furnace is generally unstable due to deposits, damaged bricks, etc. It is normal for it to remain in this state.

Therefore, during renovation, there is a risk that these unstable remnants may suddenly fall and make the renovation work dangerous, so in order to replace or repair the cooling system and bricks inside the furnace, it is necessary to , the conventional method - In such cases, the method is to remove the furnace top charging device, or open the steel shell above the tUtf body, suspend scaffolding inside the furnace, and dismantle the extra materials and bricks. Alternatively, demolition methods were used, such as loading gunpowder into the remaining bricks and deposits inside the steel shell and utilizing the destructive power of gunpowder. However, with this method, removing the charging equipment would be a major undertaking, which would require a long repair period, and the conventional scaffolding was unstable, so it was difficult to remove the extra material and bricks that had adhered to the reactor memory. It was not possible to remove it completely.

In addition, methods that rely on the destructive power of gunpowder have the disadvantage that the iron shell and cooling device are damaged when the gunpowder explodes.

The present invention has been developed to solve the drawbacks and problems of the above-mentioned conventional method, and a support beam is installed horizontally at the furnace top opening S (hereinafter referred to as the furnace mouth), and a wire is connected to the furnace top opening S (hereinafter referred to as the furnace mouth). The work deck is suspended, and workers use a crusher such as a breaker from the top of the work deck to remove debris and damaged bricks from the top of the furnace to the tuyere level, and remove debris that has fallen from the top. One of the objects of the present invention is achieved by making it possible to carry out refurbishment work with the above-mentioned work deck under safe conditions.

In order to carry out the present invention, it is of course possible and easy to remove the charging device at the top of the furnace and install a repair device, but if the charging device is removed, it will take more time and cost to restore the furnace. It is natural that this is necessary, and furthermore, the loss due to the delay in operation is also large. Therefore, in the present invention, a method is proposed in which the charging device f is installed by inserting a working deck through the opening at the tuyere level without removing it. In other words, in the present invention, a new mechanism is incorporated into the structure of the working deck.In other words, in the present invention, the furnace top charging device remains as it is,
A fixed deck was installed by horizontally supporting a support beam at the furnace mouth using members inserted through the manhole.
The present invention provides a method of reducing the size, inserting it into the furnace through the tuyere-level opening, rolling it up and installing it on the upper fixed deck, and a device adapted to this method.

The gist of the invention is as follows.

(i) Work to install a fixed deck by horizontally suspending support beams at the furnace mouth.

(2) Loading the operating deck assembly members and gondola onto the working deck and inserting them into the furnace through the tuyere level opening, (b) Place the inserted working deck onto the fixed deck provided at the top of the furnace. The process of hoisting and temporarily fixing the gondola, (g) the process of fixing the hoisted operation deck mounted on the work deck to the support beam of the fixed deck, (V') the gondola can be raised and lowered to the support beam of the fixed deck. Hanging installation work @.

(vL) Finally, after attaching the working deck to the fixed S deck so that it can be raised and lowered, the temporary fixing is released, and the operating deck supported by the fixed deck support beam is
Working deck and gondola.

It was installed in the blast furnace in an empty furnace state, and then on the operating deck, the working deck was moved to a predetermined position by operating the elevating means for the working deck, one worker was transferred to the working deck by a gondola, and the first working deck was stabilized. After that, the repair work is carried out, and then the gondola returns to the operating deck, moves one work deck to the next predetermined position, and repeats the above-mentioned repair work.

Next, the gist of the device of the present invention for carrying out the above method consists of a fixed deck horizontally placed at the furnace mouth and consisting of nine support beams, and an n+ operation deck fixed and suspended from the fixed deck support beams. ,
Below the operating deck.

It is suspended from a fixed deck support beam so that it can be raised and lowered.

This furnace wall repair device is composed of a working deck equipped with an overhanging member that can be folded and expanded in the furnace radial direction, and nine gondolas that are suspended so that they can be raised and lowered to communicate between the operating deck and the working deck.

Next, the present invention will be explained in detail with reference to the drawings based on a concrete example of the present invention.

Fig. 1 is a schematic diagram of the embodiment, Fig. 2 is a cross-sectional diagram 1, and Fig. 8 is a schematic diagram of the embodiment.
The figure is a Moom's view in FIG. 3. In the figure, 1 is a large bell, 1ila is a blast furnace shell, 6 is an armor ring wear ring plate, and a fixed deck 2 is fixed to a manhole part M by a main support beam 1B (see FIG. 4).

An operating deck 6 is fixedly installed under the fixed deck 2, making it a working deck! The working deck is suspended from a fixed deck 3 via a chain block 4 at four locations (see FIG. 8, 4a) using work deck hanging wires 1 so as to be movable up and down. Gondola 9 again
is suspended from the fixed deck 8 so that it can be raised and lowered by the gondola lifting wire 8.N1 operation deck 6 and work deck 11
Transport workers by going up and down between them. In addition, the work deck ll
The workers above are protected by handrails 10 installed around the work deck. 0 and 14 are temporary hangers for temporarily suspending the work deck 11 from the fixed deck 2 (see Figure 5).
Until the work deck 11 is suspended by the chain block 4 and the work deck suspension wire 7, it is welded and fixed to the ninth part that supports the work deck, and is removed when the suspension is completed.

Next, the operation and structure of the work deck, which is the main component of the device of the present invention, will be explained below. It must be easy to remove deposits and bricks adhering to the furnace wall, and since the work deck moves up and down inside the blast furnace from the furnace mouth to the tuyere level, it must be easy to remove it from the bottom. As you go, you need to gradually expand the furnace in one direction. One of the features of the present invention is that the day repair equipment can be installed without removing the furnace top charging equipment, but the furnace assembly at the tuyere level requires removing the damaged bricks in the deposits from the top. There is a risk of falling, and there is a large bell when assembling on the fixed deck at the furnace mouth, and there is a risk of falling off the manhole of the solo bread ball.
Since taking in material from '' requires assembly from entirely small parts and is impractical, a working deck must be inserted from the tuyere level.

Therefore, in order to avoid increasing the size of the shell opening at the level of one tuyere, the working deck must be made as small as possible. The following measures have been taken to provide the work deck with such a function. In other words, the work deck 11 has a hexagonal shape formed by beams 11' when its legs are opened, as shown in FIG. Although it has a shape,
When inserted into the furnace, the beam 11 is inserted as shown in Figure 4.5.8.
The eight sides formed by ' are folded and taken into the furnace. The work deck 1 is attached to the main support beam 18 of the furnace opening fixing deck 2.
After a temporary spa was installed in the W part on the hanger 14 that was temporarily installed on the 5th
As shown in the figure, the folded parts 1 and 5 are welded and fixed on the inner side centering on the holder part to form a hexagonal shape. Note that 0B-1, li, and 8 are chain blocks.

For example, in a blast furnace of 1,845 m'', the inner diameter of the furnace mouth is approximately 7,200 mm, so the size of one side of the hexagon of the work deck 11 is approximately 1,000 to 80 mm, as shown in Figure 8.
00M fr% PK work tare *tt 500~60
0m (D@'CMtotK6゜Next, as the working deck 11 descends from the furnace mouth, the distance between 1 wax and the working deck in the original hexagonal shape gradually decreases (in the belly of the blast furnace, the internal diameter is 10,000 m). ), it becomes difficult to remove the deposits of furnace wax with a breaker.
111 As shown in FIG. 8, the catch section II.

16' is stored in box 16' and in good condition on work deck 1.
It has a structure that allows it to be attached on top of the operating deck 6 and to extend in the circumferential direction on the operating deck 6.

The rib of the overhang 16.16' is a box structure 16'.

There is an H beam 16.16' inside the box (see Figure 8, 0), and after the slide is completed, it can be completely fixed with the nut K attached to the top of the box.

In this way, H beams l 6 , l 6 in the circumferential direction
By extending a thick steel plate to the upper surface of the work deck 11, the work deck 11 can be gradually lowered while making it slightly smaller than the inner diameter of the furnace.

In addition, when the work deck 11 is suspended from the fixed deck 8 and the breaker is used to crush 500 ~ aOO yen #IIt'L objects from 1 wax, the work deck 11 may swing from side to side, so the H7 frame storage box is used. The steady rest II shown in Figure 2 is slidably attached to the support body 15' provided on the side of the furnace 16'. The procedure for taking and installing the decks 3, operating deck 6, gondola 9, and working deck 11 into the furnace will be explained.

(Hand 11) First, take the main beam 18 of the fixed deck 2 into the furnace mouth from the manhole at the bottom of the solo bread ball.
Using this as the main support beam, a fixed deck 8 is installed at the furnace mouth.

(By hand) With work deck 11 folded, bond '79 and equipment on operating deck 6 are loaded and inserted into the furnace through the blade level opening l.

(Hand I [8) Next, move 1 working deck 11 to fixed deck 2.
#1
(See Figure 4.Is) (Step 4) As shown in Figure 5, the work deck 11 in the folded state is
By opening on both sides using the check/blocks OB1 to OB8 and welding and fixing the open back arm portions, the work deck 11 in the angle shape shown in Fig. 8 is created.0 (Step 5) Fixed deck 8 and work deck At the moment of death, the gondola 9 and the operating deck 6 are assembled and attached to the fixed deck respectively.With the above, the fixed deck Φ2, the operating deck 6, the gondola 9, and the working deck 11 are installed at the furnace mouth. and,
Each of these decks has the following functions:

Fixed Detsukito... Solo pan ball in hole X'
Workers entering and exiting from the fixed deck 2 have temporary stairs 1
Use 9 to get off this deck.
Operation deck 6, gondola 9, and work deck 1.1 are suspended.O operation deck 6... A support is taken from the fixed deck 3 and the suspended work deck 11 is suspended. This is all done by operating the chain block number on this operating deck. At this time, remove the common connection part of the hanger 14 and replace it with the wire 7. 20 is a lift ramp.

Gondola 9... Operation deck 6 and work deck 11
A worker is lifted up and down between the two.

Work deck 11: When operated on the operating deck 6 and moved to a predetermined position and fixed, the gondola 9 is transferred from the operating deck 6 to the working deck 11 to perform work.

Next, the method and procedure for removing the deposits and bricks on the deck using these decks and gondolas to a safe condition below -4 is explained below. The work deck 11, which was suspended from the deck 2 by the hanger 14, was resuspended from the hanging point (7X7'X7') shown in Figure 2.6.7 using a wire rope and a hand-wound chain block, and the hanger 14 was removed. do.

(111%) Working deck 111% suspended from fixed deck 2 with wire ropes Operate four hand-wound chain blocks 4 from above the operating deck to lower them in one pitch and attach one point of hanging wire rope. Make me nervous. Next, loosen the four Cheno blocks and fix them with wire ropes at four points in total. In this way, wire ropes 7, ? ', -7'
15! The details of the method of descending at a predetermined pitch by repeating the operation of using and replacing each other can be easily seen from FIG. 6.7. After descending to a predetermined location and becoming stable, the worker transfers from the operating deck 6 to the working deck 11 using the gondola 9. First, extend the steady rests 15 at four locations in a 90° direction from above the work deck ll toward the top of the furnace.

After stabilizing the furnace wall, remove any deposits and
Remove the damaged item.

The above description has been about repair work such as removing deposits and sway from the furnace wood surface, but it goes without saying that it can also be applied to cases such as building bricks and replacing coolers during renovation.

Since the present invention has the configuration as described above, by alternating the hanging points of the four hanging wires from the fixed deck (see Fig. 7), the wires are gradually moved from the furnace mouth to the tuyere. By lowering the furnace to the same level and expanding the working deck as the inner diameter of the furnace expands, and by allowing workers to evacuate to the gondola, it is possible to completely remove deposits and bricks adhering to the inner walls of the furnace. Therefore, the subsequent work of scraping out the hearth bottom and repairing the bricks and cooling system can be carried out safely without worrying about deposits or bricks falling from above.

Furthermore, in the present invention, since the repair device can be inserted into the furnace through the shell opening at the tuyere level, there is no need to remove the furnace top charging device, which eliminates the possibility of damage to the cooling device or excess shell. The effect of being able to start burning operations quickly with a short period of repair is enormous.

[Brief explanation of drawings]

FIG. 1 is an overall explanatory diagram of the embodiment, sIi! Figure 8 is a schematic diagram of one side of the device, Figure 8 is a Mumu view of Uki 3WJ, Figure 41! (2)
Figure 6 is a perspective view of the working deck rolled up below the fixed deck, Figure 6 (4), ■) is an explanatory diagram of the order of assembly by folding the folding part of the working deck. Front sectional view of the device, Figure 7 is a detailed explanatory diagram of the method of moving the working deck in Figure 6, Figure 8 (4) is the maximum working deck, Makitairaen, (6) is the Moom view, and (0) is the D section. Detailed drawing of O l...Large pel 2...Fixed deck 8...
Shackle number...Chain block 5...Armor ring wear ring plate 6...Operation deck 7.7',? '... Working deck hanging wire 8... Gondola lifting wire 9... Gondola lO... Handrail 11, il'
, L pi...Working deck tg...Steel shell 1t...Fixing deck main beam 1
4°゛° linker 15... work deck steady rest 16
, 16', 16', 16 a, 16 b--Working deck overhang 17... Tuyere level opening 18... Winch 19... Stairs sO...
Gangway M, ) 41...Man, Hall W
...Welded part N...Nut 0 Patent applicant
Kawasaki Steel Co., Ltd. Applicant Chugoku Kako Co., Ltd. Figure 1 Figure 2 Figure 3 Figure 4 Figure 1 1B) Figure 5 (A) <B) Figure 7 (A) (C) 30)
(21 Go to Figure 8・B・C・

Claims (1)

[Scope of Claims] L: When refurbishing a blast furnace that has been brought into an empty state through reduced-scale blowing operations, (a) A support beam is placed horizontally at the top opening without removing the top charging device. (2) The process of assembling and installing the fixed deck, (b) The process of creating an opening in the wing roll. (c) Inserting the working deck carrying the operating deck assembly members and the gondola into the furnace through the above-mentioned wing roll opening, and (2) Hoisting up the working deck inserted into the furnace and temporarily fixing it below the fixed deck. (e) A step of fixing the operating deck mounted on the working deck and hoisted up below the fixed deck; (f) Suspending and installing the gondola hoisted up in the same way on the fixed deck so that it can be raised and lowered. Engineering! . (G) A step of removing the temporary fixing after the working deck is suspended and attached to the fixed deck so that it can be raised and lowered. Through these processes, the fixed deck, operating deck,
a gondola and a working deck are installed in the furnace in an empty furnace state; - the working deck is stabilized at a predetermined position by operating the elevating means of one working deck and the adjusting means of the overhang member on the operating deck; (IJ); The workers board the gondola and move to the work deck to carry out the repair work. (b) After the above repair work is completed, the workers return to the operating deck by the gondola, and (2) move the work deck to the next predetermined position. A blast furnace furnace wall renovation method characterized by repeating such steps to continue the renovation work. Kame A blast furnace made into an empty furnace* by operating a reduced-scale blowdown system.
In the renovation of , a fixed deck Φ consisting of a support beam suspended horizontally on the top of the furnace, an operating deck fixed and suspended from the supporting beam of the fixed deck, and a support beam suspended below the operating deck so that it can be raised and lowered. A work deck that is supported, folds in the radial direction of the furnace, and is equipped with a telescopic overhang. A blast furnace single-station refurbishment device comprising a gondola suspended from the support beam so as to be movable up and down between the operation deck and the work deck.