Large blast furnace overhaul body construction method

Abstract

The invention provides a large blast furnace overhaul body construction method which comprises the following steps: after cleaning in a furnace is completed, mounting a protective shed and a protective shed central upright post; removing the last layer of carbon bricks by using an annular hoisting system of the protective shed, recovering to hoist and build the hearth carbon bricks and the tuyere combined bricks, and constructing by using the protective shed as a construction platform; the hanging scaffold is lowered to the position above the protective shed; the protective shed is dismantled; refractory spraying construction is conducted on the protective shed area, and the interior of the furnace is cleaned; baking the furnace; and dismantling the oven facility. According to the invention, the requirements of construction operations such as remaining of four layers of carbon bricks at the bottom of the furnace, removal and recovery of all of the rest carbon bricks and tuyere combined bricks, partial replacement of the cooling wall, patching of the furnace shell, lining making on the surface of the cooling wall, steel brick repair and gas sealing cover repair are met; according to the method, the construction period is effectively shortened, and the operation safety of the hearth and the masonry quality of refractory materials are effectively guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of engineering construction, and in particular to a large blast furnace overhaul body construction method. Background Art

[0002] At present, the blast furnace in the domestic steel industry is in a high temperature environment for a long time, so the furnace shell and the cooling equipment in the furnace shell are most susceptible to damage. Therefore, each blast furnace basically has to go through minor repairs, medium repairs and major repairs. In general, the furnace body frame remains unchanged, and the furnace shell, the cooling equipment and refractory materials in the furnace are all replaced, and some of the furnace top equipment is replaced.

[0003] The existing technology generally adopts conventional construction methods, which have long construction periods, many uncontrollable factors, and it is difficult to guarantee the construction quality of furnace refractory materials. Summary of the invention

[0004] In view of this, the present invention proposes a large-scale blast furnace overhaul body construction method, aiming to solve the problems of long construction period and many uncontrollable factors in the existing blast furnace overhaul construction method.

[0005] The invention proposes a method for overhauling a large-scale blast furnace body, which comprises the following steps: slag cleaning is performed on the inside of the blast furnace, the slag is cleaned to the residual iron layer, the carbon bricks around the residual iron layer are removed until the upper layer of the carbon bricks is removed, the surrounding residual iron is cleaned, and a space for carbon brick recovery is cleared in a circumferential direction; after the cleaning inside the furnace is completed, a protection shed and a central column of the protection shed are installed; in the space below the protection shed in the blast furnace body, the last layer of carbon bricks is removed by using a protective shed annular lifting system, the hearth carbon bricks and tuyere combination bricks are restored by lifting and masonry, and the space above the protection shed in the blast furnace body is constructed by using the protective shed as a construction platform; after the construction of the protection shed is completed, the lifting plate is lowered to the top of the protection shed; the space below the protection shed in the blast furnace body is lowered as the construction height decreases, the protection shed is removed, and the elevation of the central column of the protection shed is kept flush with the center line of the tuyere; after the removal of the protection shed, refractory spraying is performed on the protection shed area, and the furnace is cleaned; after the installation of the furnace baking facilities is completed, the furnace is baked; after the furnace baking is completed, the furnace baking facilities are removed.

[0006] Furthermore, the above-mentioned large-scale blast furnace overhaul main body construction method, the installation of the protection shed and the central column of the protection shed, specifically includes: assembling the protection shed on the residual iron surface of the furnace bottom and lifting it as a whole, installing the central column of the protection shed until the protective shed is fixed in the furnace waist, and finally fixing the central column on the residual iron surface, and fixing the other main beams of the protection shed at the furnace waist position, to ensure the flatness of the protection shed and the firmness of the installation.

[0007] Furthermore, in the above-mentioned large blast furnace overhaul body construction method, after the protection shed is installed, the blast furnace body is divided into two independent spaces above and below the protection shed based on the protection shed, namely the space above the protection shed and the space below the protection shed, to meet the requirements of synchronous operation between the upper and lower parts.

[0008] Furthermore, in the above-mentioned large-scale blast furnace overhaul body construction method, the space above the protection shed within the blast furnace body is used as a construction platform for construction, which specifically includes: assembling the hanging plate, cleaning the furnace shell grouting material, installing the cooling wall, restoring the furnace shell, grouting the cooling wall, repairing the steel bricks, repairing the gas seal and spraying the lining of the space above the protection shed within the blast furnace body.

[0009] Furthermore, in the above-mentioned large-scale blast furnace overhaul main body construction method, the slag removal and cleaning of the interior of the blast furnace specifically includes: stopping the blast furnace to release residual iron; cooling the furnace with water; removing the middle and large sleeves of the tuyere; removing slag from the tuyere; replacing the cooling wall and partially removing the furnace shell, and transporting the removed cooling wall and furnace shell out of the furnace to a preset storage position through the large square hole on the furnace top; hoisting an excavator from the large square hole into the furnace to remove slag, and transporting the slag in the furnace to a preset slag position; as the elevation gradually decreases, the corresponding tuyere combination bricks and carbon bricks are removed simultaneously with the slag removal, and the tuyere combination bricks and carbon bricks are transported from the large tuyere sleeve to the tuyere platform for transportation; when the height drops to a preset position below the tuyere centerline, the two symmetrical iron mouths are dug out and the refractory materials in the iron mouth area are removed to open the iron mouth channel, and the slag and refractory materials enter the main ditch through the iron mouth channel and are then loaded and transported by an excavator.

[0010] Furthermore, in the above-mentioned large-scale blast furnace overhaul main body construction method, the slag in the furnace is transported to a preset slag position, which specifically includes: the slag is transported from the tuyere to the outside of the furnace by a belt conveyor and loaded onto a truck for transport to the preset slag position, and the large pieces of slag in the slagging process are lifted out of the furnace from the large square hole on the furnace top during the rest intervals.

[0011] Furthermore, in the above-mentioned large blast furnace overhaul body construction method, as the elevation is gradually lowered, the corresponding tuyere assembly bricks and carbon bricks are removed synchronously with the slag removal, and the removed tuyere assembly bricks and carbon bricks are transported from the tuyere large sleeve to the tuyere platform for further transfer.

[0012] Furthermore, in the above-mentioned large blast furnace overhaul body construction method, the height distance between the preset position and the center line of the tuyere is 2m.

[0013] Furthermore, in the above-mentioned large-scale blast furnace overhaul body construction method, the dismantling of the protection shed includes: as the space below the protection shed inside the blast furnace body decreases with the construction height, scaffolding is erected to the space below the protection shed inside the blast furnace body, the protection shed is dismantled, and the dismantled components except the central column are transported outside the furnace.

[0014] Furthermore, in the above-mentioned large blast furnace overhaul body construction method, after the refractory spraying construction of the protection shed area is completed, the scaffolding is removed from top to bottom, and the furnace is cleaned after the scaffolding is removed.

[0015] The large-scale blast furnace overhaul main body construction method provided by the present invention meets the construction operations of dismantling and restoring the four layers of carbon bricks at the furnace bottom, retaining the remaining carbon bricks and tuyere combination bricks, replacing the cooling wall part, digging and patching the furnace shell and lining the cooling wall surface, repairing steel bricks and repairing the gas sealing cover, etc. This method effectively saves the construction period and effectively guarantees the safety of the furnace operation and the quality of refractory masonry. Among them, this method provides a reliable construction technology for such large-scale blast furnace overhaul construction, so that the construction content can be carried out smoothly, ensuring the construction quality while greatly shortening the construction period and reducing safety risks. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings: Figure 1 A flowchart of a large blast furnace overhaul body construction method provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0017] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to be able to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that, in the absence of conflict, the embodiments of the present invention and the features described in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0018] See also Figure 1 , which is a flowchart of a large blast furnace overhaul main body construction method provided by an embodiment of the present invention. As shown in the figure, the method includes the following steps: Step S1, slag cleaning is performed inside the blast furnace, the slag is cleaned to the residual iron layer, the carbon bricks around the residual iron layer are removed until the upper layer of the carbon bricks is retained, the surrounding residual iron is cleaned, and a carbon brick recovery space is cleaned along the circumferential direction.

[0019] Specifically, slag cleaning, carbon brick removal, residual iron cleaning can be carried out, and slag materials etc. can be transported to other locations outside the furnace.

[0020] Step S2, after the furnace is cleaned, the protective shed and the central column of the protective shed are installed.

[0021] Specifically, after the furnace is cleaned, the protective shed is assembled on the residual iron surface at the bottom of the furnace and lifted as a whole. The central column of the protective shed is installed by the inverted installation method until the protective shed is fixed at the furnace waist. Finally, the central column is fixed on the residual iron surface, and the other main beams of the protective shed are fixed at the furnace waist to ensure the flatness and firmness of the protective shed. After the installation of the protective shed is completed, the blast furnace body is divided into two independent spaces above and below the protective shed based on the protective shed, namely the space above the protective shed and the space below the protective shed, to meet the requirements of synchronous operation from top to bottom.

[0022] Step S3, in the space below the protection shed within the blast furnace body, the last layer of carbon bricks is removed by using the protection shed's circular lifting system, and the hearth carbon bricks and tuyere combination bricks are restored by lifting and laying. The space above the protection shed within the blast furnace body is constructed by using the protection shed as a construction platform.

[0023] Specifically, the protective shed circular lifting system is used below the protective shed to dismantle the last layer of carbon bricks and to lift and build the furnace hearth carbon bricks and tuyere combination bricks. The protective shed is used above the protective shed as a construction platform to complete the assembly of the hanging plate and the subsequent cleaning of the furnace shell grouting material, installation of the cooling wall, restoration of the furnace shell, grouting of the cooling wall, repair of steel bricks, repair of the gas cover, and spraying and lining above the protective shed. In other words, the space above the protective shed within the blast furnace body is constructed using the protective shed as a construction platform, which specifically includes: assembling the hanging plate, cleaning of the furnace shell grouting material, installation of the cooling wall, restoration of the furnace shell, grouting of the cooling wall, repair of steel bricks, repair of the gas cover, and spraying and lining of the space above the protective shed within the blast furnace body, and may also include: building of furnace hearth carbon bricks and building of tuyere combination bricks.

[0024] Step S4, after the construction of the protection shed is completed, the hanging plate is lowered to the top of the protection shed.

[0025] Specifically, after the construction above the protection shed is completed, the hanging platform is lowered to the top of the protection shed to dismantle it, and the dismantled components are transported to the outside of the furnace through the large square hole on the furnace top.

[0026] Step S5, as the space below the protection shed inside the blast furnace body decreases with the construction height, the protection shed is dismantled, and the center column of the protection shed is kept flush with the center line of the tuyere.

[0027] Specifically, as the height of the construction increases, the quick frame is set up to the lower part of the protection shed, that is, the scaffolding is set up to the space inside the blast furnace body below the protection shed, and the protection shed is dismantled. The dismantled components (except the central column) are transported to the outside of the furnace from the tuyere / large square hole on the furnace top. The central column of the protection shed is kept flush with the center line of the tuyere to facilitate the subsequent installation of the furnace drying device.

[0028] Step S6, after the protection shed is removed, the refractory material is sprayed on the protection shed area and the furnace is cleaned.

[0029] Specifically, after the protective shed is dismantled, the refractory spraying construction in the protective shed area is completed, the rapid scaffolding is dismantled from top to bottom and the furnace is cleaned, and all materials are transported to the outside of the furnace through the tuyere.

[0030] Step S7, after the installation of the baking furnace facilities is completed, the baking furnace is carried out.

[0031] Specifically, the furnace facilities are installed and the furnace is fired.

[0032] Step S8, after the baking is completed, the baking facilities are dismantled.

[0033] Specifically, after the furnace is baked, the furnace facilities are dismantled, and except for the central column of the protection shed which is hoisted from the large square hole on the furnace top to the outside of the furnace, the remaining furnace facilities are transported from the tuyere to the outside of the furnace.

[0034] In this embodiment, slag removal and cleaning of the interior of the blast furnace specifically includes: The blast furnace is shut down to discharge residual iron.

[0035] Get some water to cool the stove.

[0036] The middle and large sets of the tuyere are removed.

[0037] Slag removal from the tuyere.

[0038] The cooling wall is replaced and part of the furnace shell is removed. The removed cooling wall and furnace shell are transported out of the furnace through the large square hole on the furnace top to the preset storage location.

[0039] The excavator is hoisted from the large square hole into the furnace to remove slag, and the slag in the furnace is transported to the preset slag location. Specifically, the slag is transported from the tuyere to the outside of the furnace by a belt conveyor and loaded onto a truck and transported to the preset slag location. During the slagging process, large pieces of slag are hoisted out of the furnace from the large square hole on the top of the furnace during the rest period.

[0040] As the elevation is gradually lowered, the corresponding tuyere combination bricks and carbon bricks are removed synchronously with the slag removal, and the tuyere combination bricks and carbon bricks are transported from the tuyere large sleeve to the tuyere platform for transportation. Specifically, as the elevation is gradually lowered, the corresponding tuyere combination bricks and carbon bricks are removed synchronously with the slag removal, and the removed tuyere combination bricks and carbon bricks are transported from the tuyere large sleeve to the tuyere platform for transportation.

[0041] When the height drops to a preset position below the centerline of the tuyere, the two symmetrical iron openings are dug out and the refractory materials in the iron opening area are removed to open the iron opening passage. The slag and refractory materials enter the main ditch through the iron opening passage and are then loaded and transported by an excavator. Specifically, the height distance between the preset position and the centerline of the tuyere is 2m.

[0042] In summary, the large-scale blast furnace overhaul main body construction method provided in this embodiment meets the construction operations of dismantling and restoring the four layers of carbon bricks at the furnace bottom, retaining the remaining carbon bricks and tuyere combination bricks, replacing the cooling wall part, digging and patching the furnace shell and lining the cooling wall surface, repairing steel bricks and repairing the gas cover, etc. This method effectively saves the construction period and effectively guarantees the safety of the furnace operation and the quality of refractory masonry. Among them, this method provides a reliable construction technology for such large-scale blast furnace overhaul construction, so that the construction content can be carried out smoothly, ensuring the construction quality while greatly shortening the construction period and reducing safety risks.

[0043] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0044] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A large blast furnace overhaul body construction method, characterized in that: include: The slag is removed from the inside of the blast furnace until the residual iron layer is reached. The carbon bricks around the residual iron layer are removed until the upper layer of the carbon bricks is retained. The surrounding residual iron is cleaned and space for carbon brick recovery is cleared along the circumferential direction. After the furnace is cleaned, install the protection shed and the central column of the protection shed; In the space below the protection shed inside the blast furnace, the last layer of carbon bricks is removed by using the protection shed circular lifting system, and the hearth carbon bricks and tuyere combination bricks are lifted and laid again. In the space above the protection shed inside the blast furnace, the protection shed is used as a construction platform for construction; After the construction of the protection shed is completed, lower the hanging plate to the top of the protection shed; As the construction height decreases, the space inside the blast furnace body below the protective shed is dismantled, and the center column of the protective shed is kept flush with the center line of the tuyere; After the protective shed is dismantled, spray refractory materials on the protective shed area and clean the furnace; After the furnace facilities are installed, the furnace is baked; After the kiln is completed, the kiln facilities are dismantled.

2. The large blast furnace overhaul main body construction method according to claim 1 is characterized in that: The installation of the protection shed and the central column of the protection shed specifically includes: Assemble the protective shed on the scrap iron surface at the bottom of the furnace and lift it as a whole, install the central column of the protective shed until the protective shed is fixed at the furnace waist, and finally fix the central column on the scrap iron surface. The other main beams of the protective shed are fixed at the furnace waist to ensure the flatness of the protective shed and the firmness of the installation.

3. The large blast furnace overhaul main body construction method according to claim 2 is characterized in that: After the protection shed is installed, the blast furnace body is divided into two independent spaces, upper and lower, based on the protection shed, namely the space above the protection shed and the space below the protection shed, to meet the requirements of synchronous operation between the upper and lower parts.

4. The large blast furnace overhaul main body construction method according to any one of claims 1 to 3, characterized in that: The space above the protection shed in the blast furnace body is used as a construction platform for construction, specifically including: Assemble the hanging plate, clean the grouting material of the furnace shell, install the cooling wall, restore the furnace shell, point the cooling wall, repair the steel bricks, repair the gas seal and spray lining the space above the protective shed inside the blast furnace body.

5. The large blast furnace overhaul main body construction method according to any one of claims 1 to 3, characterized in that: The slag removal and cleaning of the interior of the blast furnace specifically includes: The blast furnace is shut down to discharge residual iron; Fetch water to cool the stove; The middle and large sets of the tuyere are removed; Slag removal at tuyere; Replace the cooling wall and part of the furnace shell, and move the removed cooling wall and furnace shell out of the furnace through the large square hole on the top of the furnace to the preset storage location; Lift the excavator from the large square hole into the furnace to remove slag, and transport the slag in the furnace to the preset slag position; As the elevation is gradually lowered, the corresponding tuyere combination bricks and carbon bricks are removed simultaneously with the slag removal. The tuyere combination bricks and carbon bricks are transported from the tuyere large set to the tuyere platform for transfer; When the height drops to the preset position below the center line of the tuyere, the two symmetrical iron openings are dug out and the refractory materials in the iron opening area are removed to open the iron opening passage. The slag and refractory materials enter the main ditch through the iron opening passage and are then loaded and transported by an excavator.

6. The large blast furnace overhaul main body construction method according to claim 5, characterized in that: The transporting of the slag in the furnace to a preset slag position specifically includes: The slag is transported from the tuyere to the outside of the furnace by a belt conveyor and loaded onto a truck for transport to the preset slag location. During the slagging process, large pieces of slag are lifted out of the furnace from the large square hole on the furnace top during breaks.

7. The large blast furnace overhaul main body construction method according to claim 5, characterized in that: As the elevation is gradually lowered, the corresponding tuyere assembly bricks and carbon bricks are removed synchronously with the slag removal, and the removed tuyere assembly bricks and carbon bricks are transported from the tuyere large sleeve to the tuyere platform for further transfer.

8. The large blast furnace overhaul main body construction method according to claim 5, characterized in that: The height distance between the preset position and the center line of the tuyere is 2m.

9. The large blast furnace overhaul main body construction method according to any one of claims 1 to 3, characterized in that: The dismantling of the protection shed includes: As the construction height decreases, the space inside the blast furnace body below the protective shed is lowered. The scaffolding is erected to the space inside the blast furnace body below the protective shed, and the protective shed is dismantled. The dismantled components except the central column are transported outside the furnace.

10. The large blast furnace overhaul main body construction method according to any one of claims 1 to 3, characterized in that: After the refractory spraying construction in the protection shed area is completed, the scaffolding is removed from top to bottom, and the furnace is cleaned after the scaffolding is removed.

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