A blast furnace shaft repairing structure and construction method

Abstract

The present application relates to a kind of blast furnace shaft repair structure and construction method, the blast furnace shaft repair structure includes cooling wall body, which is provided with recess towards the inside of furnace side, recess and the surface of cooling wall body are provided with refractory castable layer;Through type passage is provided on cooling wall body, and water cooling plate passes through through type passage and forms composite cooling heat exchange unit with cooling wall body;Multiple cooling wall body is arranged along the circumferential and longitudinal direction of blast furnace shaft;Refractory castable layer surface is provided with wet method spray lining layer;Cooling wall body and gap between furnace shell are filled with pressure grouting layer.The blast furnace shaft repair structure is first offline cast refractory castable layer when construction, then assemble water cooling plate and cooling wall body, then wet method spray lining, finally gap pressure grouting sealing.The present application effectively solves the problem of high temperature of furnace shell caused by cooling plate refractory falling off through multiple composite protection structure, and the repaired furnace type is regular, and service life is long.

Description

Technical Field

[0001] This invention relates to the field of blast furnace maintenance and construction technology, and more specifically, to a blast furnace body repair structure and construction method. Background Technology

[0002] Blast furnaces are the core equipment in steel smelting, and their furnace body is typically cooled using water-cooled plate structures. These cooling plates operate under harsh conditions of high temperature, high pressure, and high erosion. After prolonged use, the refractory material inside the cooling plates is prone to detachment and failure. Once the refractory material detaches, the insulation and cooling capacity of the cooling plates decrease significantly, directly causing abnormal increases in localized temperatures in the blast furnace shell, leading to safety hazards such as shell deformation, burn-through, and unplanned blast furnace shutdowns.

[0003] Regarding the aforementioned problem of refractory detachment from the furnace cooling plates, the traditional repair method in existing technologies typically involves simply cleaning the faulty area down to the surface of the remaining refractory before directly applying wet spraying for lining. This repair method has the following shortcomings in practical applications: First, relying solely on a single layer of sprayed coating for insulation results in poor lining formation and repair effectiveness; second, the regularity of the furnace shape after repair is unsatisfactory, making it difficult to restore the original blast furnace design; third, the service life after repair is short, and the refractory detachment problem easily recurs within a short period, requiring frequent secondary repairs.

[0004] Therefore, there is an urgent need in this field for a furnace body repair technology that can efficiently solve the problem of high furnace shell temperature caused by refractory material falling off the furnace body cooling plate, restore the regular operation furnace shape of the blast furnace, and extend the service life of the repaired furnace body. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a blast furnace body repair structure and construction method, which aims to solve the problems existing in the prior art.

[0006] According to a first aspect of the present invention, a blast furnace body repair structure is provided, comprising: The cooling wall body has a groove on the side facing the blast furnace, and a refractory castable layer is provided in the groove and on the surface of the cooling wall body facing the furnace. The cooling wall body is provided with a through channel, through which the blast furnace water-cooled plate passes. The water-cooled plate and the cooling wall body are combined to form a composite cooling and heat exchange unit. Multiple cooling wall bodies are spliced ​​together along the circumference and longitudinal direction of the blast furnace body; The surface of the refractory castable layer of the cooling wall body is provided with a wet-sprayed lining layer. The gap between the cooling wall body and the inner wall of the blast furnace shell is filled with a grouting material layer.

[0007] Preferably, the cross-sectional shape of the groove is dovetail-shaped or rectangular, the groove is arranged along the length direction of the cooling wall body, and multiple grooves are distributed at intervals along the height direction of the cooling wall body.

[0008] Preferably, the surface of the cooling wall body facing the furnace is provided with a plurality of anchors, the anchors protruding from the surface of the cooling wall body and embedded in the refractory castable layer.

[0009] Preferably, the through channel is provided along the thickness direction of the cooling wall body, and the cross-sectional shape of the through channel matches the cross-sectional shape of the water-cooled plate.

[0010] Preferably, the number of through channels is one or two, and the through channels are arranged symmetrically on the longitudinal centerline of the cooling wall body or on both sides of the longitudinal centerline.

[0011] Preferably, an assembly gap is reserved between adjacent cooling wall bodies, and the assembly gap is filled with grout to form a grout layer.

[0012] Preferably, grouting holes are provided at the top and sides of the gap between the cooling wall body and the inner wall of the blast furnace shell, and the grouting material layer is pressed into and filled into the gap through the grouting holes.

[0013] According to a second aspect of the present invention, a construction method for a blast furnace body repair structure as described above is provided, the construction method comprising the following steps: Step 1: Offline casting of cooling wall; The cooling wall body is transported to the ground prefabrication site, and refractory castable is filled into the groove of the cooling wall body and the surface of the cooling wall body facing the furnace. After compaction, it is cured until the refractory castable reaches the design strength, thus completing the prefabrication of the refractory castable layer of the cooling wall body. Step 2: Assemble the water-cooled plate and cooling wall; Remove the original failed cooling plate, retain the original blast furnace water-cooling main pipeline, align the prefabricated refractory castable layer of the cooling wall body with the direction of the water-cooled plate, so that the water-cooled plate passes through the pre-set through channel on the cooling wall body, and complete the interlocking assembly of the water-cooled plate and the cooling wall body. Adjust the installation position so that the outline of the multiple cooling wall bodies after splicing fits the original design furnace shape of the blast furnace. Leave assembly gaps between adjacent cooling wall bodies and fill them with grouting material. Step 3: Wet spraying lining in the furnace; using the hardened refractory castable layer on the surface of the prefabricated cooling wall body as the base layer, the refractory spraying material is evenly sprayed onto the surface of the refractory castable layer of all cooling wall bodies using a wet spraying process in the furnace to form a wet spraying lining layer. Step 4: Gap grouting and sealing treatment; grouting holes are reserved in the gap between the cooling wall body and the inner wall of the blast furnace shell. High-pressure grouting equipment is used to continuously press refractory grout into the gap through the grouting holes until uniform, bubble-free grout flows out from the overflow outlet on the other side of the gap. Then the grouting holes are sealed. After the refractory grout has completely solidified, it fills all gaps.

[0014] Preferably, in step three, the uneven areas are leveled by controlling the spraying thickness and spraying trajectory to form a continuous and complete inner lining and restore the regular operating furnace shape of the blast furnace. Preferably, in step three, the spraying process is carried out layer by layer from bottom to top, with each layer having a thickness of 30-50mm, and the layers are stacked to the designed thickness.

[0015] The blast furnace body repair structure and construction method provided by this invention form a composite cooling and heat exchange unit by integrating the cooling wall body with a water-cooled plate that passes through its through-channel. This is supplemented by a prefabricated refractory castable layer, a wet-sprayed lining layer, and a grouting layer in the gap between the cooling wall body and the furnace shell. This achieves a systematic, multi-layered composite protection for the cooling components, lining, and gap insulation, fundamentally solving the high-temperature defects in the furnace shell caused by refractory material detachment from the cooling plate. The refractory castable layer is prefabricated offline in the factory, forming a stable bond with the grooves of the cooling wall body, avoiding high-altitude pouring operations inside the furnace. This significantly improves the density of the lining and the controllability of construction quality. After the cooling wall body is spliced ​​and fitted to the original furnace shape, it is precisely leveled by wet spraying. The repaired furnace shape has high regularity, stable heat exchange, and effectively extends the service life of the blast furnace. Attached Figure Description

[0016] The above and other objects, features and advantages of the present invention will become clearer from the following description of embodiments of the invention with reference to the accompanying drawings.

[0017] Figure 1 A schematic diagram of a blast furnace body repair structure according to an embodiment of the present invention is shown.

[0018] Figure 2 A schematic diagram of a cooling wall body in a blast furnace body repair structure according to an embodiment of the present invention is shown.

[0019] In the figure: 1. Cooling wall body; 11. Groove; 12. Through channel; 13. Anchor; 2. Refractory castable layer; 3. Wet spray lining layer; 4. Grouting layer; 5. Water cooling plate. Detailed Implementation

[0020] Various embodiments of the invention will now be described in more detail with reference to the accompanying drawings. In the various drawings, the same elements are indicated by the same or similar reference numerals. For clarity, the various parts in the drawings are not drawn to scale.

[0021] This invention provides a blast furnace body repair structure, see below. Figure 1 The blast furnace body repair structure includes: a cooling wall body 1, a refractory castable layer 2, a wet-sprayed lining layer 3, and a grouting layer 4. The cooling wall body 1 has a groove 11 on the side facing the blast furnace interior, and the refractory castable layer 2 is disposed within the groove 11 and on the surface of the cooling wall body 1 facing the furnace interior. A through-channel 12 is provided on the cooling wall body 1, through which a blast furnace water-cooled plate 5 passes, and the water-cooled plate 5 and the cooling wall body 1 combine to form a composite cooling and heat exchange unit. Multiple cooling wall bodies 1 are spliced ​​together along the circumference and longitudinal direction of the blast furnace body. The wet-sprayed lining layer 3 is disposed on the surface of the refractory castable layer 2 on the cooling wall body 1. The grouting layer 4 fills the gap between the cooling wall body 1 and the inner wall of the blast furnace shell.

[0022] Specifically, the cooling wall body 11 is cast from cast steel or cast iron. The specific dimensions of the cooling wall body 1 can be determined based on the actual repair scope of the blast furnace body and the design parameters of the furnace type. The shape and size of the cooling wall body can vary, as long as the outline of each cooling wall body 1, after being assembled, conforms to the original design of the blast furnace. See also... Figure 2 The cooling wall body 1 has multiple grooves 11 on the side facing the blast furnace interior (i.e., the hot side). These grooves 11 extend along the length of the cooling wall body 1 (horizontal direction during installation), and are spaced apart along the height of the cooling wall body 1. The cross-sectional shape of the grooves 11 can be dovetail-shaped or rectangular; in this embodiment, the cross-sectional shape is rectangular. The grooves 11 serve as forming cavities for offline casting of refractory castable, forming a mechanically interlocking structure with the refractory castable layer 2, enhancing the bonding strength between the refractory castable layer 2 and the cooling wall body 1. This is particularly suitable for the lower furnace area where high bonding strength is required.

[0023] Furthermore, the surface of the cooling wall body 1 facing the furnace interior is provided with several anchors 13. The anchors 13 are columnar or other shaped protrusions extending from the surface of the cooling wall body 1. In a preferred embodiment, the anchors 13 can be evenly distributed in an array on the surface of the cooling wall body 1 facing the furnace interior. The height of the anchors 13 can be determined according to design requirements; in an optional embodiment, the height of the anchors 13 can be 20–50 mm. The anchors 13 serve two purposes: firstly, they are embedded in the refractory castable layer 2, increasing the anchoring force between the refractory castable layer 2 and the cooling wall body 1, preventing the refractory castable layer 2 from falling off under thermal stress and mechanical impact; secondly, the height of the anchors 13 can serve as a positioning reference for the thickness of the refractory castable, facilitating control of the uniformity of the thickness of the refractory castable layer 2. The through-channel 12 provided on the cooling wall body 1 extends along the thickness direction of the cooling wall body 1, and the cross-sectional shape of the through-channel 12 matches the cross-sectional shape of the water-cooled plate 5. In this embodiment, the cross-sectional shape of the water-cooled plate 5 is a monolithic shape, and the corresponding cross-sectional shape of the through-channel 12 is a matching monolithic shape. As an optional implementation, the inner diameter of the through-channel 12 can be set to be 10-30 mm larger than the outer diameter of the water-cooled plate 5 to facilitate the insertion and thermal expansion of the water-cooled plate 5. The number of through-channels 12 can be one or two: when there is one through-channel 12, it is located at the longitudinal centerline of the cooling wall body 1, suitable for the case where a single water-cooled plate 5 passes through; when there are two through-channels 12, the two channels are symmetrically arranged on both sides of the longitudinal centerline, suitable for the case where two water-cooled plates 5 pass through side by side.

[0024] The refractory castable layer 2 is disposed within the groove 11 and on the surface of the cooling wall body 1 facing the furnace. The refractory castable layer 2 covers the entire surface of the cooling wall body 1 facing the furnace, and the thickness of the refractory castable layer 2 is greater than the depth of the groove 11, that is, the portion exceeding the groove 11 covers the surface of the cooling wall body 1. As an optional embodiment, the thickness of the refractory castable layer 2 exceeding the groove 11 can be 20-60 mm. The anchor 13 is completely embedded in the refractory castable layer 2.

[0025] Multiple cooling wall bodies 1 are spliced ​​together along the circumference and longitudinal direction of the blast furnace body. Assembly gaps are reserved between adjacent cooling wall bodies 1, and these gaps are filled with grouting material to form a grouting layer. As an optional implementation, the width of the assembly gaps can be 5–20 mm. The grouting material can be high-alumina refractory mortar, which has good plasticity and bonding strength. The function of the grouting layer is to seal the gaps between adjacent cooling wall bodies 1, preventing high-temperature gas flow from entering the gap between the cooling wall body 1 and the furnace shell.

[0026] The wet-sprayed lining layer 3 is applied to the surface of the refractory castable layer 2 of the cooling wall body 1, covering the entire surface of the refractory castable layer 2 of the cooling wall body 1. The wet-sprayed lining layer 3 and the refractory castable layer 2 together form the blast furnace lining. The wet-sprayed lining layer 3 is used to level uneven areas, forming a continuous and complete lining, and restoring the regular operating shape of the blast furnace.

[0027] The grouting layer 4 fills the gap between the cooling wall body 1 and the inner wall of the blast furnace shell. Grouting holes are provided at the top and sides of the gap between the cooling wall body 1 and the inner wall of the blast furnace shell, and the grouting layer 4 is pressed into the gap through the grouting holes. After the grouting layer 4 fills the entire gap, it blocks the direct conduction of high-temperature airflow and heat to the furnace shell.

[0028] The present invention also provides a construction method for the blast furnace body repair structure as described above, the construction method comprising the following steps: Step 1: Offline casting of cooling wall; transport the cooling wall body 1 to the ground prefabrication site, fill the groove 11 of the cooling wall body 1 and the surface of the cooling wall body 1 facing the furnace with refractory castable, compact it and then cure it until the refractory castable reaches the design strength, thus completing the prefabrication of the refractory castable layer 2 of the cooling wall body 1.

[0029] Specifically, the cooling wall body 1 is cast from cast steel or cast iron. The cast cooling wall body 1 is then transported to a prefabrication site on the ground, and a dedicated casting mold is set up around it. Refractory castable is filled into the grooves 11 of the cooling wall body 1 and onto the surface of the cooling wall body 1 facing the furnace. After the grooves 11 are filled, filling continues until the entire surface of the cooling wall body 1 facing the furnace is covered, with a coverage thickness of 20-60 mm beyond the grooves 11. Anchors 13 are fully embedded in the refractory castable layer 2. The refractory castable is thoroughly vibrated and compacted to ensure a tight bond between the refractory castable and the walls of the grooves 11 and the anchors 13, without voids or air bubbles. Alternatively, corundum or silicon carbide refractory castable can be used, suitable for the high-temperature, high-scouring area in the lower part of the furnace. After compaction, curing is carried out at room temperature. During curing, a dedicated person supervises the process to avoid vibration and impact. After the curing period, the strength of the refractory castable layer 2 was tested. The test results met the design strength requirements, and the prefabrication of the refractory castable layer 2 of the cooling wall body 1 was completed. After offline prefabrication, the prefabricated cooling wall body 1 of the refractory castable layer 2 was transported as a whole to the blast furnace maintenance area and directly hoisted into place.

[0030] Step 2: Assemble the water-cooled plate 5 with the cooling wall; remove the original failed cooling plate, retain the original blast furnace water-cooling main pipeline, align the pre-fabricated refractory castable layer 2 cooling wall body 1 with the direction of the water-cooled plate 5, so that the water-cooled plate 5 passes through the pre-set through channel 12 on the cooling wall body 1, and complete the interlocking assembly of the water-cooled plate 5 and the cooling wall body 1. Adjust the installation position so that the outline of the multiple cooling wall bodies 1 after splicing fits the original design furnace shape of the blast furnace. Leave an assembly gap between adjacent cooling wall bodies 1 and use grouting material to fill the gap.

[0031] Specifically, the existing failed cooling plates of the blast furnace body are removed one by one, taking care to protect the original water-cooling main pipelines from damage. The prefabricated cooling wall body 1, consisting of the refractory castable layer 2, is hoisted piece by piece to its installation position using in-furnace hoisting equipment. The water-cooling plate 5 is aligned with its direction, ensuring it passes through the pre-designed through-channel 12 of the cooling wall body 1. The installation position of each cooling wall body 1 is adjusted, and a laser rangefinder and straightedge are used to ensure that the overall outline of the assembled cooling wall body 1 conforms to the original blast furnace design. A certain size assembly gap is reserved between adjacent cooling wall bodies 1. High-alumina refractory mortar is used to fill the assembly gap between adjacent cooling wall bodies 1, forming a grouting layer. The grouting layer should be full, dense, and smoothed.

[0032] Step 3: In-furnace wet spraying lining; using the hardened refractory castable layer 2 on the surface of the prefabricated cooling wall body 1 as the base layer, the refractory spraying material is evenly sprayed onto the surface of the refractory castable layer 2 of all cooling wall bodies 1 using a wet spraying process in the furnace to form a wet spraying lining layer 3.

[0033] Specifically, after the entire cooling wall body 1 is hoisted and the water-cooled plates 5 are interspersed, the lining is constructed inside the furnace using a wet spraying process, with the hardened refractory castable layer 2 on the surface of the prefabricated cooling wall body 1 as the base layer. The refractory coating is evenly sprayed onto the surface of the prefabricated refractory castable layer 2 on the cooling wall body 1 using wet spraying equipment. The spraying is carried out layer by layer from bottom to top, with each layer controlled to a thickness of 30-50 mm, and layers are stacked to the designed thickness. The spraying thickness is determined according to the design furnace shape of different parts of the blast furnace. The spraying thickness and surface flatness are monitored in real time during the spraying process. By controlling the spraying thickness and spraying trajectory, uneven areas are leveled and repaired to ensure a continuous, complete, and flat lining, restoring the blast furnace to its regular operating shape. After spraying, the lining surface is checked and found to be flat, without cracks or peeling.

[0034] Step 4: Gap grouting and sealing treatment; grouting holes are reserved in the gap between the cooling wall body 1 and the inner wall of the blast furnace shell. High-pressure grouting equipment is used to continuously press refractory grout into the gap through the grouting holes until uniform, bubble-free grout flows out from the overflow outlet on the other side of the gap. Then the grouting holes are sealed. After the refractory grout has completely solidified, it fills all gaps.

[0035] Specifically, after the cooling wall body 1 is installed, there is an assembly gap between the outer side of the cooling wall body 1 and the inner wall of the blast furnace shell. Grouting holes are pre-reserved at the top and side of the assembly gap. Using high-pressure grouting equipment, refractory grout is continuously injected into the interlayer gap between the cooling wall body 1 and the furnace shell through the grouting holes. During continuous grouting, the overflow outlet on the other side of the gap is closely observed (usually grouting is done through the pre-reserved grouting hole on the side, and the pre-reserved grouting hole at the top serves as the overflow outlet). When a uniform, bubble-free grout flows out of the overflow outlet, it indicates that the gap has been completely filled, and the grouting hole is immediately sealed. After curing, the grout fills the entire gap, blocking the high-temperature airflow and heat from being directly conducted to the furnace shell, thus completely solving the problem of furnace shell overheating.

[0036] In summary, the blast furnace body repair structure and construction method provided by this invention forms a composite cooling and heat exchange unit by integrating the cooling wall body with a water-cooled plate that passes through its through-channel. This is supplemented by a prefabricated refractory castable layer, a wet-sprayed lining layer, and a grouting layer in the gap between the cooling wall body and the furnace shell. This achieves systematic, multi-layered composite protection for the cooling components, lining, and gap insulation, fundamentally solving the high-temperature defects in the furnace shell caused by refractory material detachment from the cooling plate. The refractory castable layer is prefabricated offline in the factory, forming a stable bond with the grooves of the cooling wall body, avoiding high-altitude pouring operations inside the furnace. This significantly improves the density of the lining and the controllability of construction quality. After the cooling wall body is spliced ​​and fitted to the original furnace shape, it is precisely leveled by wet spraying, resulting in a high degree of furnace shape regularity and stable heat exchange after repair, effectively extending the service life of the blast furnace.

[0037] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0038] Finally, it should be noted that the above embodiments are merely examples for clearly illustrating the present invention and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A blast furnace body repair structure, characterized in that, include: The cooling wall body has a groove on the side facing the blast furnace, and a refractory castable layer is provided in the groove and on the surface of the cooling wall body facing the furnace. The cooling wall body is provided with a through channel, through which the blast furnace water-cooled plate passes. The water-cooled plate and the cooling wall body are combined to form a composite cooling and heat exchange unit. Multiple cooling wall bodies are spliced ​​together along the circumference and longitudinal direction of the blast furnace body; The surface of the refractory castable layer of the cooling wall body is provided with a wet-sprayed lining layer. The gap between the cooling wall body and the inner wall of the blast furnace shell is filled with a grouting material layer.

2. The blast furnace body repair structure according to claim 1, characterized in that, The groove has a dovetail or rectangular cross-sectional shape, and the groove is arranged along the length of the cooling wall body. Multiple grooves are distributed at intervals along the height of the cooling wall body.

3. The blast furnace body repair structure according to claim 1, characterized in that, The surface of the cooling wall body facing the furnace is provided with several anchors, which protrude from the surface of the cooling wall body and are embedded in the refractory castable layer.

4. The blast furnace body repair structure according to claim 1, characterized in that, The through-channel is provided along the thickness direction of the cooling wall body, and the cross-sectional shape of the through-channel matches the cross-sectional shape of the water-cooled plate.

5. The blast furnace body repair structure according to claim 1, characterized in that, The number of the through channels is one or two, and the through channels are arranged symmetrically on both sides of the longitudinal centerline of the cooling wall body.

6. The blast furnace body repair structure according to claim 1, characterized in that, An assembly gap is reserved between adjacent cooling wall bodies, and the assembly gap is filled with grout to form a grout layer.

7. The blast furnace body repair structure according to claim 1, characterized in that, Grouting holes are provided at the top and sides of the gap between the cooling wall body and the inner wall of the blast furnace shell, and the grouting material layer is pressed into and filled into the gap through the grouting holes.

8. A construction method for a blast furnace body repair structure as described in any one of claims 1 to 7, characterized in that, Includes the following steps: Step 1: Offline casting of cooling wall; The cooling wall body is transported to the ground prefabrication site, and refractory castable is filled into the groove of the cooling wall body and the surface of the cooling wall body facing the furnace. After compaction, it is cured until the refractory castable reaches the design strength, thus completing the prefabrication of the refractory castable layer of the cooling wall body. Step 2: Assemble the water-cooled plate and cooling wall; Remove the original failed cooling plate, retain the original blast furnace water-cooling main pipeline, align the pre-fabricated refractory castable layer of the cooling wall body with the direction of the water-cooled plate, so that the water-cooled plate passes through the pre-set through channel on the cooling wall body, and complete the interlocking assembly of the water-cooled plate and the cooling wall body. Adjust the installation position so that the outline of the multiple cooling wall bodies after splicing fits the original design furnace shape of the blast furnace. Leave assembly gaps between adjacent cooling wall bodies and fill them with grouting material. Step 3: Wet spraying lining in the furnace; using the hardened refractory castable layer on the surface of the prefabricated cooling wall body as the base layer, the refractory spraying material is evenly sprayed onto the surface of the refractory castable layer of all cooling wall bodies using a wet spraying process in the furnace to form a wet spraying lining layer. Step 4: Gap grouting and sealing treatment; grouting holes are reserved in the gap between the cooling wall body and the inner wall of the blast furnace shell. High-pressure grouting equipment is used to continuously press refractory grout into the gap through the grouting holes until uniform, bubble-free grout flows out from the overflow outlet on the other side of the gap. Then the grouting holes are sealed. After the refractory grout has completely solidified, it fills all gaps.

9. The construction method for the blast furnace body repair structure according to claim 8, characterized in that, In step three, the uneven areas are leveled by controlling the spraying thickness and spraying trajectory to form a continuous and complete inner lining, thus restoring the regular operating furnace shape of the blast furnace.

10. The construction method for the blast furnace body repair structure according to claim 8, characterized in that, In step three, the spraying process is carried out layer by layer from bottom to top, with each layer having a thickness of 30 to 50 mm, and the layers are stacked to the designed thickness.

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