JPH01165707A - Method for repairing wearing metal in blast furnace - Google Patents

Abstract

PURPOSE:To reduce the man-hour for fitting of a protecting liner and to easily execute repairing of worn part is wearing metal, by arranging metal parts having protrusions or recesses which are able to engage with each other at both side on the back face of the protecting liner, integrating those liners side by side with their metal parts. CONSTITUTION:At both side parts on the back face of the projecting liner 12 arranging in front of refractory for the wearing metal 3 in a blast furnace, the engaging type protruded connecting metal part 12b and the recessed connecting metal part 12a are arranged, and each protecting liner 12 is in order connected. At last, the protecting liner 12 having the recessed connecting metal part 12b is hung down with a chain 14 for hanging to complete the connecting work. This protecting liner 12 is hung with the chain 14 and fitted to the worn part of the wearing metal 3 and a chain 13 for fitting connected to a supporting metal 12c arranged at the upper part of the protecting liner is fixed and supported to a blind lounge 11b of a pipe seat 11a. Under this condition, the repair of the wear part is executed.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a method for repairing wear ring metal fittings provided in the upper part of a blast furnace.

<Prior Art> When charging materials such as ore are charged into a blast furnace using a charging device, the charging materials collide with and are received by the inner surface of a wear ring provided at the upper part of the furnace. For this reason, the wear ring hardware is worn out due to the collision of the charges, and if the wear progresses, it may be damaged by cracking or the like, and there is a risk that it may fall off.

Wearing hardware in blast furnaces plays an important role in controlling the distribution of charged raw materials, and it is necessary to prevent the progression of wear. If the wear ring hardware becomes severely damaged, it will need to be replaced to protect the steel shell and refractories and maintain good furnace conditions.

There are two types of raw material charging equipment: a bell type and a rotating chute type, but both types are equipped with wear ring hardware, and damage due to wear is inevitable.

FIG. 6 shows an example of how the wear ring hardware is attached to the bell-type charging device. When the large bell 7 is opened, the charging material is charged into the furnace via the armor plate 5 that controls the distribution of the charging material, and collides with the wear ring hardware 3 before being charged into the furnace.

The wear ring hardware 3 is a fixed type with an integral structure in which the wear-resistant hardware 3 is embedded in the refractory 3a, and as mentioned above, it gradually wears out due to the collision of charged raw materials, so it should be repaired when the damage due to wear has progressed. There is a need to.

Reference numeral 6 denotes a tube seat provided on the iron skin 1 at the top of the furnace, and the armor plate 5 is replaced through the opening of the tube seat 6. That is, the armor plate 5 is replaced by being hooked onto a hook 14 at the end of a chain 14 suspended from a hanging device 9 running on a mole rail 8 for replacing the armor plate provided above the tube seat 6.

By the way, Fig. 6 shows a wear ring with a refractory integrated structure in which the wear-resistant metal 3 on the inside of the furnace is embedded in the refractory 3a on the shell l side, but as mentioned above, collision of the charge As a result, the wear-resistant hardware 3 gradually wears out, so it is necessary to repair it when the wear progresses.

For example, Japanese Patent Application Laid-Open No. 55-89408 discloses a method of replacing the wear ring hardware when wear progresses. This is due to the rotating chute type charging device,
A separate detachable wear ring that covers the inner surface of the refractories at the upper end of the refractories stacked on the inner surface of the shell of the blast furnace can be replaced from outside the furnace.

<Problems to be Solved by the Invention> It is not a good idea to repair the integrally constructed fixed wear ring metal fittings in which wear-resistant metal fittings are embedded in the refractory shown in FIG. It takes a lot of money and time to replace the worn ring hardware with a new one.

For this reason, a method is generally adopted in which a separate protective liner is attached to the front surface of the worn metal piece embedded in the refractory material, in accordance with the method disclosed in the above-mentioned Japanese Patent Application Laid-open No. 55-8940.

However, when installing the protective liner, the mounting chain connected to the top of the protective liner can be supported by the blast furnace shell along the top surface of the wear ring hardware; The attachment chain connected to the lower part of the protective liner must be supported by drilling a hole in the lower part of the wear ring hardware and supporting it on the blast furnace shell through this hole.

However, since the material of wear ring hardware is generally ductile cast iron or heat-resistant and wear-resistant cast iron, drilling the holes is extremely difficult and not only increases the construction cost, but also requires the blast furnace to be shut down in order to open the holes. The problem is that losses due to production cuts are also large.

The present invention solves the above-mentioned conventional problems and provides a method for installing a protective liner without making holes in the wear ring hardware or the back refractory when installing the protective liner, and therefore without requiring a mounting chain at the bottom of the protective liner. The purpose is to provide the following.

<Means for Solving the Problems> In order to achieve the above-mentioned object, the present invention provides a protective liner that is divided into a plurality of pieces in the circumferential direction, and has metal fittings connected to each other in a concave-convex fitting relationship on both sides of the back side of the protective liner. We focused on connecting and integrating adjacent protective liners and conducted various studies.

As a result, by integrating the unevenness by fitting together, it is possible to prevent the protective liner from fluttering due to the collision force of the charged raw materials, and also to prevent the protective liner from floating due to the gas flow in the furnace that occurs when the raw materials in the furnace slip. This discovery led to the development of the present invention.

The present invention will be explained based on FIGS. 1 to 6. The method for repairing blast furnace wear ring hardware of the present invention is to repair a refractory on the front surface of a blast furnace fixed wear ring hardware or after removing a replaceable wear ring hardware. In a method for repairing blast furnace wear ring metal fittings by disposing a protective liner 12 on the front side of the protective liner 12, insertable convex connecting metal fittings 12b and concave connecting metal fittings 12a are provided on both sides of the rear side of the protective liner 12, The protective liner 12 provided with the shaped connecting hardware 12b and the concave connecting hardware 12a is taken into the blast furnace via the armor plate replacement tube seat 6a provided at the top of the blast furnace, and the protective liner 12 is placed adjacent to the convex inside the blast furnace. By sequentially connecting the shaped connecting hardware 12b and the concave connecting hardware 12a by inserting them into a body, and fixing the mounting chain 13 connected to the supporting hardware 12c provided at the upper end of each of the protective liners 12 to the blast furnace shell 1, the above-mentioned The protective liner 12 is attached to the mounting chain 13.
A technical measure has been taken in which the protective liner 12 is placed on the front surface of the fixed wear ring hardware or refractory for repair.

In FIGS. 1 and 2, reference numeral 10 denotes a shell opening through which a mounting chain 13 for fixing the protective liner 12 to the blast furnace shell 1 passes. Further, 11 is a hardware for fixing the mounting chain 13 to the blast furnace shell 1, lla is a tube seat, Ilb is a blind flange for fixing the mounting chain 13 by welding, etc., and 11C is a gas seal cover. It is.

12 is a protective liner that protects the worn parts of the wear ring hardware 3. 12a is a concave connecting hardware; 12b is a convex connecting hardware; 12c is a supporting hardware for supporting the weight of the protective liner 12 on the upper surface of the wear ring hardware 3 and at the same time attaching the mounting chain 13; and 12d is for installing the protective liner 12. It is a hanging piece.

FIG. 3 is a detailed view of the attachment of the convex connecting metal fittings 12b and the concave connecting metal fittings 12a attached to the side surfaces of each protective liner 12. Each protective liner 12 is sequentially connected by inserting the concave connecting metal fittings 12a into the convex connecting metal fittings 12b.

Then, as shown in FIG. 3, the protective liner 12 goes around the furnace once, and the concave connecting hardware 12a is installed last on the protective liner 12 which has the convex connecting hardware 12b installed first.
The protective liner 12 having a structure shown in FIG. From this state, if the two connecting hardware 12a and 12b are connected, a series of connecting operations will be completed.

Further, FIG. 1 shows a state in which the hanging protective liner 12 is taken in by the hanging chain 14 to the worn part of the wear ring hardware 3, and FIG.
The protective liner 1 is shown attached to the worn part of the
A mounting chain 13 connected to a supporting hardware 12c provided at the upper end of the tube seat 11a is fixed and supported on the blind lounge llb of the tube seat 11a.

The convex connecting hardware 12b and the concave connecting hardware 12a are attached to both sides of the back of the protective liner 12 (the front surface of the worn part of the wear ring hardware 3). If this configuration is used, the charging material will collide with the concave connecting metal fittings, causing the concave connecting metal fittings to wear out and lose their connection function.

<Example> The present invention will be explained in detail below.

4 and 5 show examples of installing the protective liner 12. The opening for taking the protective liner 12 into the blast furnace is generally provided for replacing the armor plate 5. Use tube seat 6. The number of armor plate replacement tube seats 6 is about 8 to 12, and the opening size is about 450mm wide and about 1.5mm long, so the number of protective liners 12 is about 24. be divided.

In the embodiment, the protective liner 12 divided into 24 parts is divided into 12 parts.
The case where the armor plate is taken in from the replacement tube seat 6 will be explained.

The protective liner 12 is taken in by a hanging device 9 such as an electric chain block set in the armor plate replacement mold 8, and the hanging chain 14 of the hanging device 9 is used.
Protect the hook 14 at the tip of the hanging piece 1 of the liner 12
2d, pass through the opening of the armor plate replacement tube seat 6, and sequentially take in the protective liner 12 into the blast furnace.
It's a lot.

In this case, since there are 12 armor plate replacement tube seats 6 and 24 protective liners 12, the protective liner 12 installed directly below the armor plate replacement tube seats 6 cannot be hung. There is one hanging chain 14, and two hanging chains 14 for the protective liner 12 installed outside the range of the armor plate replacement pipe seat 6.

FIG. 4 shows the state in which the protective liner 12 has been connected with the concave and convex connecting metal fittings 12a and 12b, and the state in which five protective liners are taken in at the final stage. Each protective liner 1
The concave and convex connecting fittings 12a and 12b attached to the first protective liner 12 are convex connecting fittings 12b on both sides, and the concave connecting fittings 12b on both sides are attached to the last protective liner 12. Let it be hardware 12a.

In addition, two types of concave-convex connecting hardware 12a and 12b are attached.

What is shown on the left half side in Fig. 5 is the protective liner 1
2 is a plan view showing a state in which all 24 pieces of 2 are temporarily connected with concave and convex connecting hardware 12aS12b directly below the armor plate replacement pipe seat 6 (corresponding to the state shown in the cross-sectional view of FIG. 1).
After this temporary connection, the attachment chain 13 hanging down on the back side of the protective liner 12 is attached to the tube seat 11a and the steel shell opening 10.
Insert a key rod (not shown) etc. into the mounting chain 1.
3, the hook is pulled out from the shell opening 10 and the tube seat 11a.

Furthermore, a hole is made in the blind flange llb through which the mounting chain 13 passes, and after passing the blind flange llb through the pulled out mounting chain 13 and setting the blind flange llb on the tube seat 11a, the mounting chain 13 is attached to a chain block (not shown). All the protective liners 12 are simultaneously set in the normal position by the pulling operation of the chain 14 and the suspending operation of the hanging chain 14 (corresponding to the state shown in the cross-sectional view of FIG. 2).

After that, fix the mounting chain 13 to the blind flange ttb by welding or the like, and finally set the gas seal cover 11c and connect the three flanges, the tube seat 11a, the blind flange llb, and the gas seal cover 11c, with bolts and nuts. .

In FIG. 5, the radial position of the protective liner 12 in the temporarily connected state shown on the left half side and the radial position where the protective liner 12 is normally set on the front surface of the wear ring hardware 3 shown on the right half side are generally Therefore, the concave connecting metal fitting 12a hole is made into a long hole of ~8 Oam in the circumferential direction, so that the protective liner 1 can be properly connected from the temporarily connected state.
Even if the diameter is expanded to the position where 2 is set, the concave-convex connecting portion is made to be able to slide in the circumferential direction.

As another example of taking the protective liners into the blast furnace and connecting them, for example, 6 of the 24 protective liners in the circumferential direction are connected as 1 & I, and 4 blocks of protective liners are set independently. You can also do that.

In this case, in order to connect the first of the six protective liners with the second, a convex connecting metal fitting 12b is attached only to one side.
In order to connect the sixth block to the fifth block, a concave connecting hardware 12a is attached to only one side of the block, and there is no connecting hardware between each block, so there is no connecting hardware between the blocks.

In this case, there is a problem of flapping because not all of them are connected, but there is an advantage that it is possible to install them separately and the number of hanging devices can be reduced.

As yet another embodiment for eliminating the above-mentioned fluttering, four blocks of protective liners are made by connecting five protective liners as a set, and convex connecting metal fittings are arranged at both ends of each block. Then, a protective liner provided with concave connecting metal fittings can be connected and integrated between each block according to the method shown in FIG. 3.

In the above embodiment, the protective liner 12 is installed on the front surface of the wear ring hardware, which has an integral structure in which the metal hardware 3b is embedded in the refractory material 3a. It can also be used for those equipped with replaceable wear ring hardware.

In this case, after removing the replaceable wear ring hardware, a protective liner is similarly placed on the front of the refractory, and the upper part of the protective liner is bent to protect the top surface of the refractory. is preferable.

<Effects of the Invention> Since the present invention is configured as described above, it is possible to reduce the closure of the steel shell when the protective liner is fixedly attached to the blast furnace steel shell. Therefore, the number of installation steps can be significantly reduced.

In addition, it is possible to reduce the number of wind breaks required for installation work and shorten the wind break time, resulting in the effect that the worn parts of the wear ring metal parts can be repaired with minimal impact on blast furnace operation.

[Brief explanation of the drawing]

1 and 2 are sectional views of main parts showing an embodiment of the present invention, FIG. 3 is a perspective view showing the connection state of the protective liner, FIG. 4 is an explanatory view showing the state of attachment of the protective liner, and FIG. The figure is a plan view showing temporary connection and final connection of the protective liner, and FIG. 6 is a sectional view showing a conventional example. l...Blast furnace iron skin, 3...Wearing hardware,
5...Armor plate, 6...Pipe seat for armor plate replacement, 8...Mole rail for armor plate replacement, 9...Hanging device, lla...Pipe seat, 12...Protective liner , 12a... Concave connecting hardware, 12b... Convex connecting hardware, 12c... Supporting hardware, 12d... Hanging piece, 13... Mounting chain, 14... Hanging chain. Patent applicant: Kawasaki Steel Corporation Figure 1

Claims (1)

[Claims] In a method for repairing blast furnace wear ring hardware by disposing a protective liner on the front surface of the fixed wear ring hardware of a blast furnace or on the front of the refractory after removing the replaceable wear ring hardware, both sides of the back side of the protective liner are provided. The protective liner provided with the convex connecting metal fittings and the concave connecting metal fittings is provided in the blast furnace through an armor plate replacement pipe seat provided at the top of the blast furnace. In the blast furnace, the protective liners are placed adjacent to each other, and the convex and concave connecting hardware are sequentially connected and integrated by insertion, and the mounting chain connected to the supporting hardware provided at the upper end of each of the protective liners is attached to the blast furnace iron. A method for repairing blast furnace wear ring hardware, characterized in that the protective liner is suspended and supported by the mounting chain by being fixed to the skin, and the protective liner is disposed in front of the fixed wear ring hardware or refractory for repair.