A method of repairing an inner lining of a brickwork and blast furnace stave online

Abstract

The application provides a kind of brick and the method for repairing lining of blast furnace cooling wall brick online, it is related to the technical field of blast furnace maintenance, including two brick bodies and the clamping plate arranged between the two brick bodies, the dovetail is arranged on the brick body, the brick provided by the application adopts split structure, can be in the case where blast furnace cooling wall is not disassembled, labor-saving, time-saving, efficiently online inlaying brick in cooling wall hot face dovetail groove, at least inlaying brick is installed in two layers of dovetail groove on cooling wall when repairing furnace lining, adjacent newly added inlaying brick layer forms net structure, so that the sprayed material can be reliably bonded with inlaying brick, the bonding strength of furnace lining and furnace wall is greatly improved, thereby prolonging the service life of furnace lining and furnace type holding time, promoting the reasonable airflow distribution and stable smooth running of blast furnace.

Description

Technical Field

[0001] This application relates to the field of blast furnace repair technology, and more specifically, to a method for online repair of the lining of blast furnace cooling walls using brickwork. Background Technology

[0002] Cooling walls are important cooling equipment in blast furnaces. Ensuring that cooling walls are not damaged and are used normally is of great significance to blast furnace production and longevity. The cooling wall body and the lining bricks are interdependent. The lining bricks isolate the cooling wall from the high temperature inside the furnace, preventing the cooling wall from being directly exposed to the high temperature environment. The cooling wall, on the other hand, transfers the heat from the lining bricks away in a timely manner through cooling water, while also providing outer shell protection and support for the lining bricks. Therefore, if one is damaged, the other will have problems.

[0003] In existing technologies, blast furnace cooling walls are generally designed with dovetail grooves to accommodate refractory bricks. These refractory bricks are typically designed with dovetail protrusions, which are embedded in the dovetail grooves of the cooling wall, covering the hot surface of the cooling wall. However, due to the harsh conditions of long-term exposure to high-temperature thermal shock, burden erosion, and chemical corrosion from alkali metal slag, the refractory lining material gradually thins, loosens, and peels off, leading to problems such as localized detachment and loss of bricks. Existing brick-laying structures are not conducive to localized replacement, and major repairs involving blast furnace shutdowns are lengthy, result in significant losses, and are costly. Therefore, short-term planned shutdowns are often utilized to employ blast furnace in-furnace spraying lining technology to quickly repair the lining, reshape the furnace, restore normal gas flow distribution, stabilize furnace operation, reduce energy consumption, eliminate equipment safety hazards, extend the blast furnace's service life, and minimize economic losses from shutdowns.

[0004] However, during the process of spraying and lining the furnace, it is often found that the refractory material in the furnace lining is loose and falls off in some areas, directly exposing the inner surface of the cooling wall. Although furnace spraying and lining technology is adopted, the refractory material bonding area is small in this area because it is relatively smooth. Often, the lining in this area will fall off again shortly after the blast furnace resumes blasting and production, which seriously affects the effect of furnace spraying and has a serious impact on blast furnace production. Summary of the Invention

[0005] The purpose of this application is to provide a method for online repair of the lining of blast furnace cooling walls and brickwork, which can solve the technical problems of online repair of blast furnaces.

[0006] This application provides a brick inlay, including two bricks and a clamping plate disposed between the two bricks, wherein the bricks are provided with dovetail tenons.

[0007] Preferably, one end of the clamp is a wedge-shaped structure.

[0008] Preferably, both the brick and the clamping plate are made of steel, and the brick and the clamping plate are welded together.

[0009] Preferably, the ends of the two bricks that are far apart from each other have a slope.

[0010] A method for online repair of the lining of a blast furnace cooling wall includes the following steps:

[0011] S1: Locate the location that needs maintenance, clean the dovetail grooves on the cooling wall for that layer, then select at least one layer of dovetail grooves on the cooling wall and clean them. After cleaning the dovetail grooves, install multiple inlay bricks in each cleaned dovetail groove.

[0012] S2: When installing the bricks, first install the two bricks into the dovetail grooves on the cooling wall, then use a hammer to knock the clamp into the space between the two bricks, and finally weld the bricks and clamps together.

[0013] S3: Spraying refractory materials to make blast furnace linings.

[0014] Preferably, in S1, the bricks on adjacent newly added brick layers are spaced apart.

[0015] Preferably, in S2, the reserved gap between the two bricks is 10mm, and the thickness of the clamping plate is 10.5mm.

[0016] Preferably, in S3, the thickness of the brick body is 50% of the thickness of the blast furnace lining.

[0017] The beneficial effects of this invention are:

[0018] The brick inserts provided by this invention adopt a split structure, which can save effort, time and efficiency to insert bricks into the dovetail grooves of the hot surface of the blast furnace cooling wall online without disassembling the blast furnace cooling wall. When repairing the furnace lining, brick inserts are installed in at least two layers of dovetail grooves on the cooling wall. The adjacent newly added brick insert layers form a mesh structure, which enables the spray coating to reliably bond with the brick inserts. The bonding strength between the furnace lining and the furnace wall is greatly improved, thereby extending the service life of the furnace lining and the furnace shape retention time, and promoting reasonable airflow distribution and stable operation of the blast furnace. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the brick-laying installation structure in this invention;

[0021] Figure 2 This is a split view of the brick inlay in this invention;

[0022] Figure 3 This is a schematic diagram showing the distribution of the newly added inlaid bricks in this invention;

[0023] Figure 4 This is a side view of the furnace lining after repair in this invention.

[0024] The reference numerals in the attached figures are as follows:

[0025] 1. Inlay bricks; 2. Brick body; 3. Plywood; 4. Dovetail tenon; 5. Cooling wall; 6. Dovetail groove; 7. Blast furnace lining. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0028] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0029] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0030] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0031] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0032] Example 1

[0033] like Figure 1-4 As shown, this application embodiment provides a brick inlay, including two brick bodies 2 and a clamping plate 3 disposed between the two brick bodies 2. The brick bodies 2 are provided with dovetail tenons 4. In use, the two brick bodies 2 are installed in pairs into the dovetail grooves 6 on the cooling wall 5, and then the clamping plate 3 is installed between the two brick bodies 2. The two brick bodies 2 and the clamping plate 3 are assembled to form a brick inlay 1 structure installed in the dovetail grooves 6.

[0034] In this embodiment, one end of the clamping plate 3 is a wedge-shaped structure, which facilitates the clamping plate 3 to enter between the two bricks 2.

[0035] In this embodiment, both the brick body 2 and the clamping plate 3 are made of steel. The brick body 2 and the clamping plate 3 are welded together. Welding can reduce structural redundancy and improve the stability of the brick inlay structure 1 formed by the brick body 2 and the clamping plate 3.

[0036] In this embodiment, the ends of the two bricks 2 that are far apart from each other have bevels. The bevels facilitate the adhesion of the spray coating and are beneficial for slag adhesion.

[0037] Example 2

[0038] A method for online repair of the lining of a blast furnace cooling wall includes the following steps:

[0039] S1: Locate the location that needs maintenance, clean the dovetail grooves 6 of that layer on the cooling wall 5, then select at least one layer of dovetail grooves 6 on the cooling wall 5 and clean them. After cleaning the dovetail grooves 6, install multiple inlay bricks 1 in each cleaned dovetail groove 6.

[0040] S2: When adding the brick 1, first install the two bricks 2 into the dovetail grooves 6 on the cooling wall 5 respectively, then use a hammer to knock the clamping plate 3 into the space between the two bricks 2, and finally weld and fix the bricks 2 and the clamping plate 3.

[0041] S3: Spraying refractory materials to make blast furnace linings.

[0042] When in use, at least two layers of dovetail grooves 6 on the cooling wall 5 are fitted with bricks 1. The adjacent newly added brick layers form a mesh structure, which enables the sprayed paint to be reliably bonded to the bricks 1. The bonding strength between the furnace lining and the furnace wall is greatly improved, thereby extending the service life of the furnace lining and the furnace shape retention time, and promoting the reasonable airflow distribution and stable operation of the blast furnace.

[0043] In this embodiment, in S1, the bricks 1 on the adjacent newly added brick layers are spaced apart to form a maze-like structure, which is more conducive to the coating material adhering to the slag on it and accelerates the formation of the furnace lining.

[0044] In this embodiment, in S2, the reserved gap between the two bricks 2 is 10mm, and the thickness of the clamping plate 3 is 10.5mm. The brick inlay structure formed by the bricks 2 and the clamping plate 3 can be tightly fitted with the dovetail groove 6 on the cooling wall 5, thereby improving the stability of the installation.

[0045] In this embodiment, in S3, the thickness of the brick 2 is 50% of the thickness of the blast furnace lining. Figure 4 As shown, point a represents the thickness of the blast furnace lining 7, and point b represents the thickness of the brick body 2.

[0046] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A type of inlaid brick, characterized in that: It includes two bricks and a clamping plate disposed between the two bricks, wherein the bricks are provided with dovetail tenons.

2. The inlay method according to claim 1, characterized in that: One end of the clamp is a wedge-shaped structure.

3. The inlay method according to claim 1, characterized in that: Both the brick and the clamping plate are made of steel, and the brick and the clamping plate are welded together.

4. The inlay method according to claim 1, characterized in that: The ends of the two bricks that are far apart from each other have inclined surfaces.

5. A method for online repair of the lining of a blast furnace cooling wall using bricks as described in any one of claims 1-4, characterized in that: Includes the following steps: S1: Locate the location that needs maintenance, clean the dovetail grooves on the cooling wall for that layer, then select at least one layer of dovetail grooves on the cooling wall and clean them. After cleaning the dovetail grooves, install multiple inlay bricks in each cleaned dovetail groove. S2: When installing the bricks, first install the two bricks into the dovetail grooves on the cooling wall, then use a hammer to knock the clamp into the space between the two bricks, and finally weld the bricks and clamps together. S3: Spraying refractory materials to make blast furnace linings.

6. The method for online repair of the lining of a blast furnace cooling wall according to claim 5, characterized in that: In S1, the bricks on adjacent newly added brick layers are spaced apart.

7. A method for online repair of the lining of a blast furnace cooling wall according to claim 5, characterized in that: In S2, the reserved gap between the two bricks is 10mm, and the thickness of the cladding is 10.5mm.

8. A method for online repair of the lining of a blast furnace cooling wall according to claim 5, characterized in that: In S3, the thickness of the brick body is 50% of the thickness of the blast furnace lining.

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