A method for repairing the refractory lining of a high-temperature furnace

Abstract

The present invention discloses a method for repairing the refractory lining of a high-temperature furnace, including: Step 1, stuffing fiber blankets or fiber cotton of the same material or a higher material between the fiber modules with gaps as a compensation layer; Step 2, wetting the surface of the fiber modules with a curing agent; Step 3, drilling holes in the fiber modules with a hand-held electric drill; Step 4, pouring a fiber thermal protection coating into the holes; Step 5, spraying a fiber thermal protection coating on the surface of the fiber modules; Step 6, pasting the original or new fiber blanket refractory layer; Step 8, filling the original ceramic nail insertion holes in the fiber blanket refractory layer with a fiber thermal protection coating; Step 9, drilling holes with a hand-held electric drill, inserting ceramic nails after pouring the fiber thermal protection coating; Step 10, applying a supplementary coating of the fiber thermal protection coating around the ceramic nails. This method protects the heat insulation layer, improves the strength and load-bearing capacity of the heat insulation layer, and solves the problem that the heat insulation layer powderizes and its strength decreases after long-term use of the kiln furnace, resulting in the inability to fix the refractory layer.

Description

Technical Field

[0001] The present invention relates to a method for repairing a high-temperature furnace, and particularly to a method for repairing a refractory lining of a high-temperature furnace. Background Art

[0002] At present, tunnel kilns, shuttle kilns and other kilns in industries such as electroceramics and ceramics mainly use temperatures of about 1200-1280°C. Currently, most use a full-fiber kiln lining structure with an alumina fiber blanket refractory layer and a zirconium-containing fiber module insulation layer. The lining life is generally about 4 years. After that, the zirconium-containing fiber modules will be partially pulverized, and the alumina fiber blanket refractory layer will fall off due to the inability to adhere, attaching to the calcined objects in the furnace, causing losses.

[0003] When the service life of the lining structure reaches the limit, generally, the materials in the original structure will be removed and new materials will be installed. This method is relatively costly, causing a certain economic burden to the user, and the construction period is long, affecting the use of the kiln. How to quickly repair the zirconium-containing fiber module insulation layer in the original structure and solve the problems of low strength and falling of the alumina fiber blanket caused by the pulverization of the zirconium-containing fiber modules in the lining structure has become an urgent problem to be solved by current kiln users.

[0004] When the furnace lining material reaches the service life limit, the furnace lining material is completely removed and new materials are purchased and reinstalled. Although its service life will be long, this method has a long construction period and high cost, increasing the economic burden on the kiln user.

[0005] Chinese patents CN 208832998 U "A repair structure for the ceramic fiber lining of the end wall of a heating furnace" and CN 208832997 U "A repair structure for the ceramic fiber lining of the furnace top of a heating furnace" are both for repairing the damaged refractory layer on the surface of the lining. The repair principle is to connect each structural unit with anchor bolts as the keel structure. This repair method cannot solve the problem of the alumina fiber blanket refractory layer falling off caused by the pulverization of the zirconium-containing fiber module insulation layer in the "full-fiber kiln lining structure of alumina fiber blanket and zirconium-containing fiber module", and a large number of anchor bolts described in the above technical solutions will form a heat bridge, increasing the heat transfer in the kiln, causing heat loss and accompanied by an increase in the temperature outside the furnace. Summary of the Invention

[0006] The object of the present invention is to provide a method for repairing a refractory lining of a high-temperature furnace. This repair method involves drilling holes obliquely in the insulation layer and pouring a fiber thermal protection coating, which integrates with the fiber thermal protection coating on the surface of the insulation layer, thereby increasing the load-bearing capacity and surface strength of the insulation layer. At the same time, taking the fiber thermal protection coating as the main medium means, the refractory layer, insulation layer and ceramic nails are connected and fixed, so as to ensure that there will be no heat bridge and no additional heat loss in the structure.

[0007] The technical solution of the present invention provides a method for repairing the refractory lining of a high-temperature furnace, which is characterized in that:

[0008] Step 1: Treat the fiber module insulation layer on the top surface of the furnace, that is, remove the fibers that are easy to fall off after surface pulverization, and insert fiber blankets or fiber cotton of the same material or higher heat-resistant grade between the fiber modules with gaps as a compensation layer;

[0009] Among them, the fiber blanket or fiber cotton used for plugging the gaps is made of the same heat-insulating material as the fiber module insulation layer; or the fiber blanket or fiber cotton is made of a heat-insulating material with a temperature grade higher than that of the fiber module insulation layer;

[0010] Step 2: Wet the surface of the fiber module processed in Step 1 with a curing agent;

[0011] Step 3: Use a hand drill to drill holes in the fiber module at an angle of 30-60° from the vertical, with a hole diameter of 8-12 mm and a drilling depth > 150 mm, ensuring that the depth exceeds the thickness of the pulverized fiber module; the number of holes drilled on the surface of each fiber module is 2-5 or holes are drilled every 150-230 mm. Preferably, at least one hole can pass through the fiber blanket or fiber cotton inserted into the gap of the fiber module;

[0012] Step 4: Pour the fiber thermal protection coating into the holes in Step 3 to ensure that all the holes are filled and compacted;

[0013] Step 5: Spray the fiber thermal protection coating on the surface of the fiber module that has been filled in Step 4; first spray about 2-3 mm evenly, with a smooth surface spraying, so that it can be fully combined with the fiber module insulation layer;

[0014] Step 6: Perform a second spray on the surface of the fiber module that has completed the first spray in Step 5, spray evenly, with a smooth surface spraying, and the overall spraying thickness is 6-12 mm;

[0015] Step 7: When spraying the fiber thermal protection coating for the second time in Step 6, start pasting the original fiber blanket refractory layer, and paste it while spraying;

[0016] Step 8: After pasting the original fiber blanket refractory layer, fill the original ceramic nail insertion holes with the fiber thermal protection coating, and then apply the fiber thermal protection coating around the original ceramic nail insertion holes, with a coating thickness of 5-7 mm. The coating area of the fiber thermal protection coating should be larger than the area of the end of the original ceramic nail, so that the fiber thermal protection coating on the surface of the fiber module is connected and penetrated with the fiber thermal protection coating outside the fiber blanket;

[0017] Step 9: Use a hand drill to drill a hole at the center of the fiber thermal protection coating applied to the original ceramic nail insertion hole from the surface of the fiber blanket, and use a caulking gun to pour the fiber thermal protection coating into the bottom of the hole and insert the ceramic nail;

[0018] Step 10: Apply supplementary coating with fiber thermal protection coating around the ceramic nails inside the inserted lining structure.

[0019] Furthermore, when the fiber module is a zirconium-containing fiber module, the fiber blanket refractory layer correspondingly is an alumina fiber blanket refractory layer.

[0020] Furthermore, when the fiber module is a high-aluminum fiber module, the fiber blanket refractory layer correspondingly is a mullite fiber blanket refractory layer.

[0021] Furthermore, when the fiber module is a high-purity fiber module, the fiber blanket refractory layer correspondingly is a zirconium fiber blanket refractory layer.

[0022] Furthermore, in Step 2, the curing agent is one of silica sol or alumina sol, and is prepared with water according to a certain weight ratio. The configured ratio is silica sol or alumina sol: water = 1:2 - 4.

[0023] Furthermore, silica sol or alumina sol: water = 1:3.

[0024] Furthermore, in Step 3, the electric drill makes holes at an angle of 30 - 45° perpendicular to the fiber module. The number of holes is 2 - 3 or holes are made every 180 - 200 mm.

[0025] Furthermore, in Step 5, the fiber thermal protection coating is a slurry-like coating material mainly composed of fibers and refractory fillers, and its service temperature grade is higher than or equivalent to the service temperature grade of the refractory layer; one or several temperature grades of fiber thermal protection coatings can be selected and used in mixture.

[0026] Furthermore, in Step 6, the overall spraying thickness of the fiber thermal protection coating is 6 - 8 mm.

[0027] Furthermore, in Step 9, the ceramic nails are selected to be nail-shaped with barbs or deep threads;

[0028] When using ceramic nails with barbs, the ceramic nails with barbs rotate 90° after being vertically inserted into the holes filled with a little fiber thermal protection coating;

[0029] When using ceramic nails with deep threads, the ceramic nails with deep threads are rotated and inserted into the holes filled with fiber thermal protection coating.

[0030] The beneficial effects of the present invention are as follows:

[0031] (1) The present invention uses the fiber thermal protection coating as the main means to repair the powdered and damaged heat insulation layer, and can connect and fix the refractory layer and the heat insulation layer at the same time.

[0032] (2) By drilling holes in the heat insulation layer and pouring in fiber thermal protection coating, which integrates with the fiber thermal protection coating on the surface of the refractory layer, it protects the heat insulation layer while improving its strength and load-bearing capacity, solving the problem that the heat insulation layer pulverizes and its strength decreases after long-term use of the kiln furnace, making it unable to fix the refractory layer.

[0033] (3) The repaired kiln furnace of this invention has a heat preservation and insulation performance not lower than or better than that of the original structure. There will be no thermal bridges in the structure and no additional heat loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the repair structure of the refractory lining of the high-temperature furnace shown in this invention.

[0035] 1 - furnace wall, 2 - heat insulation layer, 3 - repair layer, 4 - refractory layer, 5 - ceramic nail, 6 - compensation layer. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0036] The following is a detailed description of the technical solution of this invention in combination with the attached Figure 1 drawings.

[0037] The embodiments of this invention provide methods for repairing the refractory lining of high-temperature furnaces. These methods include, but are not limited to, repairing the all-fiber kiln lining structure of alumina fiber blanket refractory layer and zirconium-containing fiber module heat insulation layer. As long as it is a structure of fiber blanket refractory layer and fiber module heat insulation layer, and the temperature resistance grade of the refractory layer is higher than that of the heat insulation layer, the method can be used for lining repair. For specific methods, see the following embodiments:

[0038] Embodiment 1

[0039] This embodiment provides a method for repairing the refractory lining of a high-temperature furnace. Taking the all-fiber lining structure of alumina fiber blanket refractory layer and zirconium-containing fiber module heat insulation layer as an example, aiming at the situation of pulverization and damage of the zirconium-containing fiber module in the structure, the overall lining structure is repaired. The specific method includes:

[0040] Step 1: First, treat the pulverized zirconium-containing fiber module heat insulation layer on the inner surface of the furnace, that is, remove the fibers that are easy to fall off after surface pulverization, and insert zirconium-containing fiber blankets between the zirconium-containing fiber modules with gaps as a compensation layer;

[0041] Step 2: Mix silica sol and water in a ratio of 1:3, and wet the surface of the zirconium-containing fiber module processed in Step 1;

[0042] Step 3: Use a hand drill to drill holes at an angle of 30° perpendicular to the zirconium-containing fiber module, with a hole diameter of 12 mm and a drilling depth of 160 mm. The number of holes drilled on the surface of each zirconium-containing fiber module is 2 or 3, and ensure that at least one hole passes through the zirconium-containing fiber blanket inserted into the gap of the zirconium-containing fiber module;

[0043] Step 4: Pour the fiber thermal protection coating with a temperature resistance level of 1400 °C into the holes in Step 3 to ensure that all the holes are filled and compacted.

[0044] Step 5: Spray the fiber thermal protection coating with a temperature resistance level of 1400 °C on the surface of the zirconium-containing fiber module that has been filled in Step 4. First, spray about 3 mm evenly and smoothly on the surface to make it fully combine with the heat insulation layer of the zirconium-containing fiber module.

[0045] Step 6: Conduct a second spraying on the surface of the zirconium-containing fiber module that has completed the first spraying in Step 5. Spray evenly and smoothly, and the overall spraying thickness is 6 mm.

[0046] Step 7: When spraying the fiber thermal protection coating with a temperature resistance level of 1400 °C for the second time in Step 6, start pasting the original alumina fiber blanket refractory layer while spraying.

[0047] Step 8: After pasting the original alumina fiber blanket refractory layer, fill the original insertion holes with the fiber thermal protection coating with a temperature resistance level of 1400 °C, and then apply the fiber thermal protection coating with a temperature resistance level of 1400 °C around the holes. The coating thickness is 5 mm. The coating area of the fiber thermal protection coating with a temperature resistance level of 1400 °C should be larger than the end area of the ceramic nails, so that the fiber thermal protection coating with a temperature resistance level of 1400 °C on the surface of the zirconium-containing fiber module is connected and penetrated with the fiber thermal protection coating with a temperature resistance level of 1400 °C outside the alumina fiber blanket.

[0048] Step 9: Use a hand-held electric drill to drill a hole at the center of the original insertion hole where the fiber thermal protection coating with a temperature resistance level of 1400 °C is applied on the surface of the alumina fiber blanket. Use a caulking gun to pour a little fiber thermal protection coating with a temperature resistance level of 1400 °C into the bottom of the hole, and then rotate and insert a deep-threaded ceramic nail.

[0049] Step 10: Use the fiber thermal protection coating with a temperature resistance level of 1400 °C to make supplementary coating around the ceramic nails inserted into the lining structure in Step 9.

[0050] Example 2

[0051] This example provides a method for repairing the refractory lining of a high-temperature furnace. Taking the all-fiber lining structure of a mullite fiber blanket refractory layer and a high-aluminum fiber module heat insulation layer as an example, aiming at the pulverization and damage of the high-aluminum fiber module in the structure, the overall lining structure is repaired. The method specifically includes:

[0052] Step 1: First, process the heat insulation layer of the pulverized high-aluminum fiber module on the inner surface of the furnace, that is, remove the fibers that are easy to fall off after surface pulverization, and insert a zirconium-containing fiber blanket between the high-aluminum fiber modules with gaps as a compensation layer.

[0053] In this step, since the temperature resistance level of zirconium-containing fiber is higher than that of high-aluminum fiber, inserting a zirconium-containing fiber blanket as a compensation layer can achieve better results;

[0054] Step 2: Mix silica sol and water in a weight ratio of 1:2, and wet the surface of the high-aluminum fiber module processed in Step 1;

[0055] Step 3: Use a hand-held electric drill to drill holes at an angle of 45° to the vertical of the high-aluminum fiber module, with a hole diameter of 10 mm and a drilling depth of 160 mm. The number of holes drilled on the surface of each high-aluminum fiber module is 2 or 3, and ensure that at least one hole passes through the zirconium-containing fiber blanket stuffed in the gap of the high-aluminum fiber module.

[0056] Step 4: Pour a fiber thermal protection coating with a temperature resistance level of 1400 °C into the holes in Step 3 to ensure that all the holes are filled and solid;

[0057] Step 5: Spray a fiber thermal protection coating with a temperature resistance level of 1400 °C on the surface of the high-aluminum fiber module that has been filled in Step 4; First spray about 3 mm, spray evenly, and make the surface smooth, so that it can be fully combined with the heat insulation layer of the high-aluminum fiber module first;

[0058] Step 6: Conduct a second spray on the surface of the high-aluminum fiber module that has completed the first spray in Step 5, spray evenly, make the surface smooth, and the overall spray thickness is 8 mm;

[0059] Step 7: When spraying the second layer of the fiber thermal protection coating with a temperature resistance level of 1400 °C in Step 6, paste the original mullite fiber blanket refractory layer, and paste it while spraying;

[0060] Step 8: After pasting the original mullite fiber blanket refractory layer, fill the original insertion holes with a fiber thermal protection coating with a temperature resistance level of 1400 °C, and then apply a fiber thermal protection coating with a temperature resistance level of 1400 °C around the holes, with a coating thickness of 5 mm. The coating area of the fiber thermal protection coating with a temperature resistance level of 1400 °C should be larger than the end area of the ceramic nail, so that the fiber thermal protection coating with a temperature resistance level of 1400 °C on the surface of the high-aluminum fiber module is connected and penetrated with the fiber thermal protection coating with a temperature resistance level of 1400 °C outside the mullite fiber blanket;

[0061] Step 9: Use a hand-held electric drill to drill a hole from the surface of the mullite fiber blanket at the center of the original insertion hole coated with a fiber thermal protection coating with a temperature resistance level of 1400 °C, use a caulking gun to pour a little fiber thermal protection coating with a temperature resistance level of 1400 °C into the bottom of the hole, and vertically insert a barbed ceramic nail and rotate it 90°;

[0062] Step 10: Use a fiber thermal protection coating with a temperature resistance level of 1400 °C to make supplementary coating around the ceramic nails inserted into the lining structure in Step 9.

[0063] Example 3

[0064] Taking the all-fiber lining structure of a zirconium-containing fiber blanket refractory layer and a high-purity fiber module insulation layer as an example, in view of the pulverization and damage of the high-purity fiber modules in the structure, the overall lining structure is repaired.

[0065] Step 1: First, treat the high-purity fiber module insulation layer with pulverization on the inner surface of the furnace, that is, remove the fibers that are easy to fall off after surface pulverization, and insert a zirconium-containing fiber blanket between the high-purity fiber modules with gaps as a compensation layer;

[0066] In this step, since the temperature resistance grade of zirconium-containing fibers is higher than that of high-purity fibers, inserting a zirconium-containing fiber blanket as a compensation layer can achieve better results;

[0067] Step 2: Mix silica sol and water in a ratio of 1:3, and wet the surface of the high-purity fiber modules processed in Step 1;

[0068] Step 3: Use a hand drill to drill holes in the high-purity fiber modules at a 40° angle to the vertical, with a hole diameter of 10 mm and a drilling depth of 160 mm. The number of holes drilled on the surface of each high-purity fiber module is 3 or 4, and ensure that at least one hole passes through the zirconium-containing fiber blanket inserted into the gap of the high-purity fiber module.

[0069] Step 4: Pour a fiber thermal protection coating with a temperature resistance grade of 1400°C into the holes in Step 3 to ensure that all the holes are filled and compact;

[0070] Step 5: Spray a fiber thermal protection coating with a temperature resistance grade of 1400°C on the surface of the high-purity fiber modules that have been filled in Step 4. First, spray about 3 mm evenly and smoothly on the surface to make it fully combine with the high-purity fiber module insulation layer first;

[0071] Step 6: Conduct a second spraying on the surface of the high-purity fiber modules that have completed the first spraying in Step 5, spray evenly and smoothly on the surface, and the overall spraying thickness is 10 mm;

[0072] Step 7: When spraying the fiber thermal protection coating with a temperature resistance grade of 1400°C for the second time in Step 6, start pasting a new zirconium-containing fiber blanket refractory layer and paste it while spraying;

[0073] For the repair of the kiln, the original refractory layer fiber blanket can be selected for use, and new materials can also be used.

[0074] Step 8: Use a hand-held electric drill to punch holes on the surface of the zirconium-containing fiber blanket at intervals of 150 - 230 mm, preferably at intervals of 200 mm, and ensure that the hole positions cover the edge parts of the zirconium-containing fiber blanket. Use a caulking gun to pour a little fiber thermal protection coating with a heat resistance rating of 1400°C into the bottom of the holes, and then apply the fiber thermal protection coating with a heat resistance rating of 1400°C around the holes, with a coating thickness of 5 mm. The coating area of the fiber thermal protection coating with a heat resistance rating of 1400°C on the surface of the high-purity fiber module should be larger than the end area of the ceramic nails, so that the fiber thermal protection coating with a heat resistance rating of 1400°C on the surface of the high-purity fiber module is connected and penetrated with the fiber thermal protection coating with a heat resistance rating of 1400°C outside the zirconium-containing fiber blanket. Vertically insert the barbed ceramic nails and rotate them 90°;

[0075] Step 9: Use the fiber thermal protection coating with a heat resistance rating of 1400°C to make supplementary coating around the ceramic nails inserted into the lining structure in Step 8.

[0076] Although only three embodiments are given in this application, it can be understood that in addition to being able to select the alumina fiber blanket refractory layer, mullite fiber blanket, and zirconium-containing fiber blanket for the fiber blanket refractory layer, one or several of high-aluminum fiber blanket, crystal fiber blanket, and chromium-containing fiber blanket can also be selected for mixed or superimposed application.

[0077] In some embodiments, it is optional to use a hand-held electric drill to punch holes at an angle of 60° perpendicular to the fiber module; the hole diameter can be selected as 8 mm, and the punching depth can be selected as > 150 mm to ensure that the depth exceeds the thickness of the fiber module pulverization;

[0078] In some embodiments, in Step 3, the number of holes punched on the surface of each fiber module can be selected as 5 or punched at intervals of 150 - 230 mm. Preferably, in some embodiments, the holes can be punched at intervals of 180 - 200 mm on the surface of each fiber module.

[0079] In some embodiments, in Step 6, the overall spraying thickness can be selected as 12 mm.

[0080] In some embodiments, in Step 5, it is optional to spray about 2 mm first.

[0081] In some embodiments, in Step 8, the coating thickness of the fiber thermal protection coating can be selected as 7 mm.

[0082] Those skilled in the art should understand that the above embodiments are only illustrative implementations of the present invention and do not limit the scope of the present invention. The details in the embodiments do not constitute a limitation on the scope of the present invention. Without departing from the spirit and scope of the present invention, any obvious changes such as equivalent transformations and simple replacements based on the technical solutions of the present invention all fall within the protection scope of the present invention.

Claims

1. A method for repairing the refractory lining of a high-temperature furnace, characterized in that: Step 1: Treat the fiber module insulation layer on the surface of the furnace top, that is, remove the fibers that are easy to fall off after surface pulverization, and insert fiber blankets or fiber cotton of the same material or higher heat resistance grade between the fiber modules with gaps as a compensation layer; Among them, the fiber blanket or fiber cotton used for caulking is made of the same heat-insulating material as the fiber module insulation layer; or the fiber blanket or fiber cotton is made of a heat-insulating material with a temperature grade higher than that of the fiber module insulation layer; Step 2: Wet the surface of the fiber module processed in Step 1 with a curing agent; Step 3: Use a hand-held electric drill to drill holes at an angle of 30-60° to the vertical of the fiber module, with a hole diameter of 8-12 mm and a drilling depth > 150 mm, ensuring that the depth exceeds the thickness of the pulverized fiber module; the number of holes drilled on the surface of each fiber module is 2-5 or holes are drilled every 150-230 mm, and at least one hole is guaranteed to pass through the fiber blanket or fiber cotton inserted into the gap of the fiber module; Step 4: Pour the fiber thermal protection coating into the holes in Step 3 to ensure that all the holes are filled and compacted; Step 5: Spray the fiber thermal protection coating on the surface of the fiber module completed in Step 4; first spray about 2-3 mm, spray evenly, and the surface is sprayed smoothly to make it fully combined with the fiber module insulation layer; Step 6: Perform a second spray on the surface of the fiber module that has completed the first spray in Step 5, spray evenly, and the surface is sprayed smoothly, with an overall spray thickness of 6-12 mm; Step 7: When spraying the fiber thermal protection coating for the second time in Step 6, start pasting the original fiber blanket refractory layer, and paste it while spraying; Step 8: After pasting the original fiber blanket refractory layer, fill the original ceramic nail insertion holes with the fiber thermal protection coating, and then apply the fiber thermal protection coating around the original ceramic nail insertion holes, with an application thickness of 5-7 mm. The application area of the fiber thermal protection coating should be larger than the area of the end of the original ceramic nail to make the fiber thermal protection coating on the surface of the fiber module connected and penetrated with the fiber thermal protection coating outside the fiber blanket; Step 9: Use a hand-held electric drill to drill a hole at the center of the fiber thermal protection coating applied to the original ceramic nail insertion hole from the surface of the fiber blanket, and use a caulking gun to pour the fiber thermal protection coating into the bottom of the hole and insert the ceramic nail; Step 10: Retouch the fiber thermal protection coating around the ceramic nail inserted into the inner part of the lining structure.

2. The method for repairing the refractory lining of a high-temperature furnace according to claim 1, characterized in that: When the fiber module is a zirconium-containing fiber module, the fiber blanket refractory layer corresponds to an alumina fiber blanket refractory layer.

3. The method for repairing the refractory lining of a high-temperature furnace according to claim 1, characterized in that: When the fiber module is a high-aluminum fiber module, the fiber blanket refractory layer corresponds to a mullite fiber blanket refractory layer.

4. The method for repairing the refractory lining of a high-temperature furnace according to claim 1, characterized in that: When the fiber module is a high-purity fiber module, the fiber blanket refractory layer corresponds to a zirconium-containing fiber blanket refractory layer.

5. The method for repairing the refractory lining of a high-temperature furnace according to claim 1, characterized in that: In Step 2, the curing agent is one of silica sol or alumina sol, and is prepared with water according to a certain weight ratio. The mixing ratio is silica sol or alumina sol: water = 1:2 - 4.

6. The method for repairing the refractory lining of a high-temperature furnace according to Claim 5, wherein: Silica sol or alumina sol: water = 1:

3.

7. The method for repairing the refractory lining of a high-temperature furnace according to Claim 1, wherein: In Step 3, the electric drill makes holes at an angle of 30 - 45° to the vertical of the fiber module, and the number of holes is 2 - 3 or holes are made at intervals of 180 - 200 mm.

8. The method for repairing the refractory lining of a high-temperature furnace according to claim 1, wherein: In Step 5, the fiber thermal protection coating is a slurry-like coating material mainly composed of fibers and refractory fillers, and its service temperature grade is higher than or equivalent to that of the refractory layer; one or several temperature grades of fiber thermal protection coatings can be selected and used in combination.

9. The method for repairing the refractory lining of a high-temperature furnace according to Claim 1, wherein: In Step 6, the overall spraying thickness of the fiber thermal protection coating is 6 - 8 mm.

10. The method for repairing the refractory lining of a high-temperature furnace according to Claim 1, wherein: In Step 9, the ceramic nails are selected to be in the shape of nails with barbs or deep threads; When using barbed ceramic nails, the barbed ceramic nails are rotated 90° after being vertically inserted into the holes filled with a little fiber thermal protection coating; When using deep-threaded ceramic nails, the deep-threaded ceramic nails are rotated and inserted into the holes filled with fiber thermal protection coating.

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