Online repairing method for platinum channel in heating loop

Abstract

The invention relates to the technical field of platinum channel maintenance, and discloses an online repair method for a platinum channel in a heating loop. The repairing method comprises the following steps: step 10, acquiring a numerical value record of each thermocouple, and determining the position of the thermocouple of which the numerical value is abnormally changed; step 20, discharging the glass liquid in the platinum channel; 30, at least part of the heat preservation supporting structure in the area near the thermocouple with the abnormally-changed numerical value is dismantled, the platinum heating pipeline in the area near the thermocouple with the abnormally-changed numerical value is exposed, and the fracture position of the platinum heating pipeline is determined; step 40, cutting off a local area of the platinum heating pipeline at the fracture position; 50, manufacturing a repairing piece matched with the cut-off area in size, and welding the repairing piece to the cut-off area of the platinum heating pipeline; and step 60, recovering the heat preservation supporting structure. The repairing method is high in repairing efficiency, low in repairing cost and good in follow-up quality regulation and control effect on the molten glass, and the risk of secondary fracture can be reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of platinum channel maintenance, and in particular to an online repair method for a platinum channel in a heating circuit. Background Art

[0002] In the production of substrate glass and carrier glass, the role of platinum channel equipment is to adjust the defects and quality of the glass liquid flowing out of the furnace. The adjustment methods include heating the glass liquid, stirring the glass liquid, cooling the glass liquid to control viscosity, etc. The platinum channel equipment includes multiple heating circuits. Figure 1 This is a schematic diagram of the structure of a heating circuit. Figure 2 is a cross-sectional view of the heating circuit, such as Figure 1 and Figure 2 As shown, the heating circuit includes a platinum channel, a heat-insulating support structure, and several thermocouples, such as Figure 3 As shown, the platinum channel comprises a platinum heating pipe and two platinum heating flanges. The platinum heating pipes house the molten glass, while the platinum heating flanges are mounted outside the pipes and connected to an external circuit. Several thermocouples are spaced axially along the pipes and used to detect the temperature of the molten glass at corresponding locations. An insulating support structure wraps around the pipes, providing insulation and support. When current flows through the flanges, the self-heating heat of the pipes transfers to the molten glass within, thereby regulating the temperature of the molten glass.

[0003] During the production and operation of platinum channel equipment, due to the erosion of glass liquid and the aging of platinum heating pipes, the platinum heating pipes may break, resulting in the platinum heating flange being unable to be powered, which in turn leads to uncontrolled temperature of the glass liquid flowing through the platinum heating pipes and glass quality, and the occurrence of glass defects. To address the above problems, existing solutions include: 1. Power compensation of the heating circuits upstream or downstream of the faulty power circuit to reduce the impact of the platinum heating pipe breakage in the heating circuit on the glass quality, but this method changes the glass processing process and may not be ideal; 2. Dismantling and replacing the entire power circuit that has not reached its designed service life will seriously affect production efficiency and increase the cost of production equipment. Summary of the Invention

[0004] The purpose of the present invention is to propose an online repair method for a platinum channel in a heating circuit, which has high repair efficiency and low repair cost. It not only ensures good subsequent quality control of the glass liquid, but also reduces the risk of secondary fracture.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] An online repair method for a platinum channel in a heating circuit, the heating circuit comprising a platinum channel, a thermal insulation support structure covering the platinum channel, and a plurality of thermocouples, the platinum channel comprising a platinum heating pipe, the plurality of thermocouples being arranged at intervals along the axial direction of the platinum heating pipe, the online repair method for the platinum channel in the heating circuit comprising:

[0007] Step 10, obtaining the numerical records of each thermocouple and determining the location of the thermocouple where the abnormal sudden change in numerical value occurs;

[0008] Step 20, discharging the glass liquid in the platinum channel;

[0009] Step 30: at least partially dismantle the insulation support structure in the vicinity of the thermocouple with the abnormal value mutation, so as to expose the platinum heating pipe in the vicinity of the thermocouple with the abnormal value mutation, and confirm the fracture position of the platinum heating pipe;

[0010] Step 40, cutting off a local area of the platinum heating pipe at the fracture location;

[0011] Step 50: making a repair piece that matches the size of the cut-out area, and welding the repair piece to the cut-out area of the platinum heating pipe;

[0012] Step 60: Restore the thermal insulation support structure.

[0013] As an optional solution, in step 40, the local excision method of the broken position is: a certain length of pipe section is cut off on both sides of the broken position of the platinum heating pipe, so that the remaining platinum heating pipe forms two separated segments.

[0014] As an optional solution, the total length of the pipe sections removed on both sides of the fracture location is not less than 120 mm.

[0015] As an optional solution, after the pipe section is cut off, the cutting surfaces of the two segments are perpendicular to the axial direction of the platinum heating pipe.

[0016] As an optional solution, in step 50, the repair part is made by cutting a strip of plate, the width of which is the same as the total length of the pipe sections cut off on both sides of the fracture position, and the length of which is not less than the circumference of the platinum heating pipe.

[0017] As an optional solution, in step 50, the welding method of the repair part is:

[0018] First, bend the repair piece into a U shape;

[0019] Welding the lower end of the repair piece to the two segments from the inner side of the platinum heating pipe to form inner welds;

[0020] Welding the upper end of the repair piece to the two segments from the outside of the platinum heating pipe to form outer welds;

[0021] The ends of the patch are trimmed so that the two ends of the patch are butted together, and the two ends of the patch are welded together from the outside of the platinum heating pipe.

[0022] As an optional solution, the end of the outer weld overlaps with the end of the inner weld.

[0023] As an optional solution, the butt welds formed at both ends of the repair piece are perpendicular to the axial direction of the platinum heating pipe.

[0024] As an optional solution, the thermal insulation support structure includes a crucible, a steel structure, a crucible filler, and a thermal insulation layer. The crucible is arranged on the periphery of the platinum heating pipe, and the crucible filler is filled between the platinum heating pipe and the crucible. The steel structure is arranged on the periphery of the crucible, and the thermal insulation layer is sandwiched between the crucible and the steel structure, wherein:

[0025] In step 30, when removing the insulation support structure in the vicinity of the thermocouple with abnormal value sudden change, part of the crucible in the vicinity is retained so that the crucible does not split in the axial direction.

[0026] As an optional solution, if there are two thermocouples with abnormal sudden changes in value, the insulation support structure between the two thermocouples is removed; if there is one thermocouple with abnormal sudden changes in value, the insulation support structure between the two thermocouples adjacent to the thermocouple is removed.

[0027] The beneficial effects of the present invention are:

[0028] In the online repair method for the platinum channel in the heating circuit of the present invention, when the platinum heating flange cannot be powered on, it indicates that the platinum heating pipe has a problem of fracture. The glass liquid seeping from the fracture position contacts the thermocouple, which will cause the thermocouple to have a significant abnormal value mutation. In the present invention, by obtaining the numerical records collected by the thermocouple already in the heating circuit itself, the location of the thermocouple with the abnormal value mutation is obtained, thereby roughly locating the fracture position; the fracture position is accurately found by partially removing the insulation support structure; the wall thickness of the platinum channel on both sides of the fracture position will be thinner, so the present application cuts off the fracture position and then re-welds the repair part, which not only ensures the sealing of the platinum heating pipe, but also removes the above-mentioned thinned area, thereby avoiding the problem of subsequent fracture. The online repair method for the platinum channel in the heating circuit of the present invention does not require the entire heating circuit to be dismantled, and can quickly obtain the fracture position of the platinum channel and perform local repair. Not only is the repair efficiency high and the cost low, but the thinned area is also repaired simultaneously, so the risk of secondary fracture can be reduced. In addition, compared with the power compensation method through the upstream or downstream power circuit, better glass liquid quality control can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of a heating circuit provided by a specific embodiment of the present invention;

[0030] Figure 2 is a cross-sectional view of a heating circuit provided in a specific embodiment of the present invention;

[0031] Figure 3 Schematic diagram of the structure of the platinum channel provided by a specific embodiment of the present invention;

[0032] Figure 4 is a side view of a platinum channel provided in a specific embodiment of the present invention;

[0033] Figure 5 This is a schematic diagram of a heating circuit provided by a specific embodiment of the present invention after removing part of the insulation support structure and cutting off the local platinum heating pipe at the broken position;

[0034] Figure 6 This is a schematic diagram of the partial structure of the heating circuit provided by a specific embodiment of the present invention when the lower end of the repair part is welded;

[0035] Figure 7 yes Figure 6 Cross-sectional view of the mid-structure;

[0036] Figure 8 This is a schematic diagram of the partial structure of the heating circuit provided by a specific embodiment of the present invention when welding the upper end of the repair part;

[0037] Figure 9 yes Figure 8 A cross-sectional view of the structure in FIG.

[0038] Figure 10 It is a schematic diagram of the partial structure of the heating circuit provided by the specific embodiment of the present invention after the repair part is welded.

[0039] In the picture:

[0040] 10. Platinum channel; 11. Platinum heating pipe; 12. Platinum heating flange; 13. Segmentation;

[0041] 20. Insulation support structure; 21. Crucible; 22. Crucible filling material; 23. Steel structure; 24. Insulation layer;

[0042] 30. Thermocouple;

[0043] 40. Repair parts;

[0044] 51. Inside weld; 52. Outside weld; 53. Butt weld. DETAILED DESCRIPTION

[0045] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It will be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all structures.

[0046] In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific circumstances.

[0047] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0048] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meanings.

[0049] This embodiment provides an online repair method for a platinum channel in a heating circuit, which can quickly and cost-effectively repair a heating circuit of a platinum channel device when the heating circuit fails to power on.

[0050] Typically, a platinum channel device consists of multiple heating circuits connected in series, such as Figure 1-Figure 4 As shown, a single heating circuit includes a platinum channel 10, an insulation support structure 20, and a plurality of thermocouples 30. The platinum channel 10 includes a platinum heating pipe 11 and two platinum heating flanges 12. The platinum heating pipe 11 is provided with a flow of molten glass. The platinum heating flanges 12 are arranged around the outside of the platinum heating pipe 11. The two platinum heating flanges 12 are arranged axially at intervals along the platinum heating pipe 11 and are used to connect to an external circuit. When the two platinum heating flanges 12 are energized, the platinum heating pipe 11 self-heats and heats the molten glass flowing through the platinum heating pipe 11 by heat conduction, thereby achieving temperature control of the molten glass. The plurality of thermocouples 30 are arranged axially at intervals along the platinum heating pipe 11 and are used to detect and reflect the temperature of the molten glass at the corresponding position.

[0051] like Figure 1 and Figure 2 As shown, the insulation support structure 20 wraps around the platinum heating pipe 11 and is used to insulate and support the platinum heating pipe 11. The platinum heating flange 12 partially extends outside the insulation support structure 20 to facilitate electrical connection to an external circuit. In this embodiment, the insulation support structure 20 includes a crucible 21, a steel structure 23, a crucible filler 22, and an insulation layer 24. The crucible 21 is positioned around the platinum heating pipe 11, with the crucible filler 22 filling the space between the platinum heating pipe 11 and the crucible 21. The crucible 21 is made of a hard and high-temperature resistant material. Together with the crucible filler 21, it supports the platinum heating pipe 11, thereby preventing it from being squeezed. The steel structure 23 is positioned around the crucible 21, with an insulation layer 24 sandwiched between the crucible 21 and the steel structure 23. The insulation layer 24 supports and insulates the crucible 21, controlling heat dissipation. The steel structure 23 covers and supports all internal structures.

[0052] In the prior art, when the two platinum heating flanges 12 of the heating circuit cannot be powered, power compensation is usually performed through the upstream or downstream heating circuit. However, this method changes the glass processing process and the effect may not be ideal. Another method is to completely dismantle and replace the power circuit that has not reached its designed service life, which will seriously affect production efficiency and increase the cost investment in production equipment.

[0053] In this regard, Figure 5-10 As shown, this embodiment provides an online repair method for a platinum channel in a heating circuit, comprising:

[0054] Step 10, obtaining the numerical records of each thermocouple 30, and determining the location of the thermocouple 30 where the abnormal sudden change in numerical value occurs;

[0055] Step 20, discharging the glass liquid in the platinum channel 10;

[0056] Step 30, at least partially dismantling the insulation support structure 20 in the vicinity of the thermocouple 30 with the abnormal value change, exposing the platinum heating pipe 11 in the vicinity of the thermocouple 30 with the abnormal value change, and confirming the fracture position of the platinum heating pipe 11;

[0057] Step 40, cutting off the local area of the platinum heating pipe 11 at the fracture position;

[0058] Step 50 , making a repair piece 40 that matches the size of the cutout area, and welding the repair piece 40 to the cutout area of the platinum heating pipe 11 ;

[0059] Step 60 : Restore the thermal insulation support structure 20 .

[0060] In the online repair method of the platinum channel in the heating circuit of the present invention, when the platinum heating flange 12 cannot be powered on, it indicates that the platinum heating pipe 11 has a broken problem. The glass liquid seeping from the broken position contacts the thermocouple 30, which will cause the thermocouple 30 to have an obvious abnormal value mutation. In the present invention, the numerical records collected by the thermocouple 30 already in the heating circuit are obtained to obtain the location of the thermocouple 30 with the abnormal value mutation, thereby roughly locking the broken position; the broken position is accurately found by partially dismantling the insulation support structure 20; the wall thickness of the platinum channel 10 on both sides of the broken position will become thinner, so the present application cuts off the broken position and then re-welds the repair part 40, which not only ensures the sealing of the platinum heating pipe 11, but also removes the above-mentioned thinning area at the same time, thereby avoiding the problem of subsequent breakage. The online repair method of the platinum channel in the heating circuit of this embodiment does not require the entire heating circuit to be dismantled, and can quickly obtain the fracture location of the platinum channel 10 and perform local repair. Not only is the repair efficiency high and the cost low, but the thinned area is also repaired simultaneously, thereby reducing the risk of secondary fracture. In addition, compared with the method of power compensation through the upstream or downstream power supply circuit, better glass liquid quality control can be achieved.

[0061] It should be noted that, in step 20, the specific method of discharging the glass liquid in the platinum channel 10 can be referred to the prior art and will not be described here in detail. It is sufficient to ensure that the glass liquid in the platinum heating pipe 11 is completely discharged.

[0062] In step 10, after obtaining the values of all thermocouples 30, the following situations may occur: 1. Only one thermocouple 30 has an abnormal value mutation; 2. Two of the thermocouples 30 have abnormal value mutations; 3. The values of multiple thermocouples 30 have abnormal value mutations. Based on the above situations, the method of dismantling the insulation support structure 20 in step 30 is adjusted accordingly.

[0063] Specifically, when removing the insulation support structure 20 in the area near the abnormally mutated thermocouple 30: If only one thermocouple 30 with an abnormally mutated value is found, it means that the thermocouple 30 is in direct contact with the glass liquid, so it is basically judged that the fracture position of the platinum heating pipe 11 is near the thermocouple 30, and therefore, the insulation support structure 20 between the two thermocouples 30 adjacent to the thermocouple 30 can be removed. If two thermocouples 30 with abnormally mutated values are found, it means that the two thermocouples 30 may be in direct contact with the glass liquid, so it is basically judged that the fracture position of the platinum heating pipe 11 is located between the two thermocouples 30, and therefore, the insulation support structure 20 between the two thermocouples 30 can be removed. If multiple thermocouples 30 with abnormally mutated values are found, the insulation support structure 20 between the two thermocouples 30 that are farthest apart among the multiple thermocouples 30 is removed.

[0064] like Figure 5 As shown, in step 30, when the insulation support structure 20 in the vicinity of the thermocouple 30 with abnormal sudden changes in value is removed, part of the crucible 21 in the vicinity is retained to prevent the crucible 21 from being broken in the axial direction. With such a configuration, after the pipe sections on both sides of the broken position of the platinum heating pipe 11 are cut off in step 40, the remaining two segments 13 will be limited by the crucible 21, thereby ensuring that the relative positions of the two segments 13 are fixed, thereby avoiding the relative position deviation of the segments 13 during the subsequent welding of the repair part 40, which may result in the repair part 40 being unable to be accurately welded. In this embodiment, Figure 5 As shown, when removing the insulation support structure 20 in the area near the abnormally mutated thermocouple 30, the steel structure 23 and the insulation layer 24 on both sides of the platinum heating pipe 11 can be removed, and then the parts of the crucible 21 above and on both sides of the platinum heating pipe 11 can be removed, and the part of the crucible 21 below the platinum heating pipe 11 can be retained. Finally, all the filling materials of the crucible 21 around the platinum heating pipe 11 can be removed.

[0065] like Figure 5 As shown, in step 40, the localized area of the platinum heating pipe 11 at the fracture location is removed by removing a predetermined length of pipe section on either side of the fracture location, thereby forming two spaced-apart segments 13 within the remaining platinum heating pipe 11. Since fractures in the platinum heating pipe 11 are typically caused by repeated erosion by molten glass, the areas on either side of the fracture location become thinner. By removing a predetermined length of pipe section on both sides of the fracture location, the thinned area can be completely removed. Replacing the thinned area with the patch 40 reliably eliminates the thinned area, thereby reducing the risk of secondary fractures in the platinum heating pipe 11.

[0066] In some embodiments, the total length of the pipe sections removed on both sides of the fracture site is no less than 120 mm. This arrangement creates sufficient operating space, thereby improving the ease of welding the repair piece 40. Alternatively, the total length of the pipe sections removed on both sides of the fracture site can be 120 mm, 130 mm, 140 mm, etc. Those skilled in the art can flexibly adjust the specific value of this total length based on the specific shape and size of the fracture site, and this is not limited here.

[0067] In this embodiment, the cut surfaces of the two segments 13 after the pipe section is removed are both perpendicular to the axial direction of the platinum heating pipe 11. These two cut surfaces are the surfaces that will interface with the repair piece 40. By cutting them perpendicular to the axial direction of the platinum heating pipe 11, not only the shape of the repair piece 40 is more regular, but also the weld between the repair piece 40 and the platinum heating pipe 11 is more regular.

[0068] like Figure 6 and Figure 7As shown, in step 50, the repair part 40 is fabricated by cutting a strip of sheet metal from a plate-like blank. The width of this strip is equal to the total length of the pipe segments removed on both sides of the fracture site, and the length of this strip of sheet metal is no less than the circumference of the platinum heating pipe 11, thereby ensuring that the repair part 40 completely fills the removed portion of the platinum heating pipe 11. Furthermore, the strip-shaped repair part 40 does not yet form a closed ring when welding the repair part 40 to the segment 13. This not only facilitates the shape adjustment of the repair part 40 to ensure precise alignment between the repair part 40 and the segment, but also relieves welding stress, ensuring the shape accuracy of the repair part 40 after welding, and thus the shape accuracy of the repaired platinum heating pipe 11. It should be understood that the material of the repair part 40 is identical to that of the original platinum heating pipe 11.

[0069] It should be noted that when welding the repair part 40, the glass retained in the platinum heating pipe 11 can be cleaned first by using a torch heating device to ensure smooth subsequent welding process.

[0070] Since the operating space below the platinum heating pipe 11 is small, the welding method of the repair piece 40 in this embodiment is as follows:

[0071] like Figure 6 and Figure 7 As shown, the repair piece 40 is first bent into a U shape.

[0072] Next, the lower end of the patch 40 is welded to each of the two segments 13 from the inside of the platinum heating pipe 11, forming inner welds 51. It should be noted that during this welding process, the shape of the patch 40 can be adjusted while welding to ensure proper fit at the butting edges between the patch 40 and the segments 13. Optionally, the highest point of the inner weld 51 is approximately located along the axis of the platinum heating pipe 11. Optionally, argon arc welding can be used.

[0073] Then, if Figure 8 and Figure 9 As shown, the upper end of the repair piece 40 is welded to the two segments 13 from the outside of the platinum heating pipe 11, and an outer weld 52 is formed. During this welding process, it is also necessary to adjust the shape of the repair piece 40 while welding to ensure the fit between the patch 40 and the segment 13 at the joint edge. The inner weld 51 and the outer weld 52 cooperate to form a weld between the repair piece 40 and the segment 13 at each position along the axial direction, thereby ensuring the sealing of the patch 40 at the joint position with the segment 13. Optionally, as Figure 9As shown, the end of the outer weld 52 overlaps the end of the inner weld 51 (i.e., the butt joint), thereby ensuring the reliability of the seal at the butt joint, thereby further improving the density performance of the repaired platinum heating pipe 11. Optionally, the overlap length between the inner weld 51 and the outer weld 52 can be 5 mm, 10 mm, etc., and the specific value can be flexibly selected.

[0074] Then, if Figure 10 As shown, the ends of the patch 40 are trimmed so that the two ends of the patch 40 are butted together, and then the two ends of the patch 40 are welded together from the outside of the platinum heating pipe 11. This seals the patch 40. Optionally, the butt welds 53 formed at the two ends of the patch 40 are perpendicular to the axial direction of the platinum heating pipe 11.

[0075] In step 60, in the step of restoring the thermal insulation support structure 20, the shape of the crucible 21 can be restored by stacking corundum bricks (the material of the crucible 21 is corundum), then the crucible filling material 22 is filled into the crucible 21, and then the thermal insulation layer 24 and the steel structure 23 are restored.

[0076] After step 60 is completed, proceed to:

[0077] In step 70 , the restored platinum channel 10 is electrically heated, and the heating rate is based on the cold-state heating process parameters of the platinum channel equipment to ensure that the expansion of the heating circuit is reasonable and controlled.

[0078] In step 80 , the furnace is heated to raise the level of the molten glass until the molten glass in the platinum heating pipe 11 flows through.

[0079] Obviously, the above embodiments of the present invention are merely examples for the purpose of illustrating the present invention, and are not intended to limit the embodiments of the present invention. Those skilled in the art will readily vary the specific embodiments and scope of application based on the principles of the present invention, and this specification should not be construed as limiting the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention are intended to be included within the scope of protection of the claims.

Claims

1. An online repair method for a platinum channel in a heating circuit, the heating circuit comprising a platinum channel (10), a heat-insulating support structure (20) wrapped around the platinum channel (10), and a plurality of thermocouples (30), wherein the platinum channel (10) comprises a platinum heating pipe (11), and the plurality of thermocouples (30) are arranged at intervals along the axial direction of the platinum heating pipe (11), characterized in that: Online repair methods for platinum channels in heating circuits include: Step 10, obtaining the numerical records of each thermocouple (30), and determining the location of the thermocouple (30) where the abnormal sudden change in numerical value occurs; Step 20, discharging the glass liquid in the platinum channel (10); Step 30, at least a portion of the heat-insulating support structure (20) in the vicinity of the thermocouple (30) with the abnormal value mutation is removed to expose the platinum heating pipe (11) in the vicinity of the thermocouple (30) with the abnormal value mutation, so as to confirm the fracture position of the platinum heating pipe (11); Step 40, cutting off the local area of the platinum heating pipe (11) at the fracture position; Step 50, making a repair piece (40) that matches the size of the cut-out area, and welding the repair piece (40) to the cut-out area of the platinum heating pipe (11); Step 60: Restore the thermal insulation support structure (20).

2. The online repair method for a platinum channel in a heating circuit according to claim 1, characterized in that: In step 40, the local excision method of the fracture position is: a certain length of pipe section is respectively cut off on both sides of the fracture position of the platinum heating pipe (11), so that the remaining platinum heating pipe (11) forms two spaced segments (13).

3. The online repair method for a platinum channel in a heating circuit according to claim 2, characterized in that: The total length of the pipe sections removed on both sides of the fracture site shall not be less than 120 mm.

4. The online repair method for a platinum channel in a heating circuit according to claim 2, characterized in that: After the pipe section is cut off, the cutting surfaces of the two segments (13) are both perpendicular to the axial direction of the platinum heating pipe (11).

5. The online repair method for a platinum channel in a heating circuit according to claim 2, characterized in that: In step 50, the repair part (40) is made by cutting a strip of plate, the width of which is the same as the total length of the pipe sections removed on both sides of the fracture position, and the length of which is not less than the circumference of the platinum heating pipe (11).

6. The online repair method for a platinum channel in a heating circuit according to claim 5, characterized in that: In step 50, the welding method of the repair piece (40) is: First, the repair piece (40) is bent into a U shape; Welding the lower end of the repair piece (40) to the two segments (13) from the inner side of the platinum heating pipe (11) to form an inner weld (51); Welding the upper end of the repair piece (40) to the two segments (13) from the outside of the platinum heating pipe (11) to form an outer weld (52); The end portion of the repair piece (40) is trimmed so that the two ends of the repair piece (40) are butted together, and the two ends of the repair piece (40) are welded together from the outside of the platinum heating pipe (11).

7. The online repair method for a platinum channel in a heating circuit according to claim 6, characterized in that: The end of the outer weld (52) overlaps with the end of the inner weld (51).

8. The online repair method for a platinum channel in a heating circuit according to claim 6, characterized in that: The butt welds (53) formed at both ends of the repair piece (40) are perpendicular to the axial direction of the platinum heating pipe (11).

9. The online repair method for a platinum channel in a heating circuit according to any one of claims 1 to 8, characterized in that: The heat-insulating support structure (20) comprises a crucible (21), a steel structure (23), a crucible filling material (22) and a heat-insulating layer (24); the crucible (21) is arranged on the periphery of the platinum heating pipe (11); the crucible filling material (22) is filled between the platinum heating pipe (11) and the crucible (21); the steel structure (23) is arranged on the periphery of the crucible (21); the heat-insulating layer (24) is sandwiched between the crucible (21) and the steel structure (23); wherein: In step 30, when removing the heat-insulating support structure (20) in the vicinity of the thermocouple (30) with abnormal value mutation, a portion of the crucible (21) in the vicinity is retained so that the crucible (21) is not separated in the axial direction.

10. The online repair method for a platinum channel in a heating circuit according to any one of claims 1 to 8, characterized in that: If there are two thermocouples (30) with abnormal sudden changes in value, the thermal insulation support structure (20) between the two thermocouples (30) is removed; if there is one thermocouple (30) with abnormal sudden changes in value, the thermal insulation support structure (20) between the two thermocouples (30) adjacent to the thermocouple (30) is removed.

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