Method for replacing serpentine tubes of evaporation zone of coke dry quenching boiler

Abstract

The application discloses a replacement method, in particular to a replacement method for serpentine pipes in the evaporation area of a dry quenching coke oven waste heat boiler, and belongs to the technical field of boiler accessory maintenance and repair. The replacement method is characterized in that: first, a replacement hoisting tool is arranged above the serpentine pipes which need to be replaced in the oven; at the same time, an access channel which can allow at least one serpentine pipe to pass through is cut on the water-cooled wall at the position of the platform assembly; then, the old serpentine pipes which need to be replaced are removed in turns by the replacement hoisting tool under the cooperation of the access channel in units of the serpentine pipes; next, the new serpentine pipes are replaced in turns by the replacement hoisting tool under the cooperation of the access channel in units of the serpentine pipes; finally, the water-cooled wall which is cut off and the corresponding components are restored, and the replacement of the serpentine pipes in the evaporation area of the dry quenching coke oven waste heat boiler is completed.

Description

Technical Field

[0001] This invention relates to a replacement method, and more particularly to a replacement method for the serpentine tubes in the evaporation zone of a dry-quenching coke oven waste heat boiler, belonging to the field of boiler accessory repair and maintenance technology. Background Technology

[0002] In steel production, dry quenching coke boilers are advanced equipment that reduces environmental pollution, facilitates heat recovery, and provides high-quality coke to blast furnaces. After a period of operation, the equipment needs to be inspected and damaged parts replaced, especially the serpentine tubes in the boiler's evaporation zone, which typically corrode and fail before the water-cooled wall pipes.

[0003] In the prior art, patent CN107416690A, entitled "A Lifting Tool for Installing and Positioning Economizer Serpentine Tubes in a Dry Quenching Coke Boiler and Its Usage Method," discloses a lifting tool for installing and positioning economizer serpentine tubes in a dry quenching coke boiler. This tool includes a track, a pulley hanger, a hand-operated hoist, and a diamond-shaped support. The track is a section of I-beam. The hand-operated hoist is placed on the pulley hanger on the track, lifting the economizer and moving it along the track to the economizer installation position. Patent CN117685555A, entitled "A Sealing Box for Multi-Row Tube Bundles at the Through-Tube Location of a Water-Cooled Wall in a Dry Quenching Coke Boiler," discloses a sealing box for multi-row tube bundles at the through-tube location of a water-cooled wall in a dry quenching coke boiler. This box includes a fixing box and a sealing cover. The fixing box is fixedly installed at the through-tube location of the water-cooled wall and surrounds the outside of the tube bundle. The patent with publication number CN215491269U, entitled "A Serpentine Tube Installation and Fixing Device for Economizer of Dry Quenching Coke Boiler", discloses a serpentine tube installation and fixing device for economizer of dry quenching coke boiler, belonging to the technical field of serpentine tube installation and fixing devices, including a mounting plate, a base and auxiliary devices.

[0004] The aforementioned patents do not propose specific hoisting schemes for the serpentine tubes in the evaporation zone of dry quenching coke boilers, nor do they propose solutions for the movement and positioning of the serpentine tubes within the boiler.

[0005] The boiler tubes of a dry quenching waste heat boiler in the second phase of a coal coking plant were being replaced, primarily the economizer and the serpentine tubes in the evaporation zone. The evaporation zone consists of upper and lower layers, each with 46 sets of serpentine tubes, totaling 92 sets. The upper and lower layers of serpentine tubes in the evaporation zone are surrounded by water-cooled wall tubes, and the top contains superheater tubes and a steam drum, hindering the entry and exit of the serpentine tubes. The common method is to install the evaporation zone serpentine tubes first, followed by the water-cooled wall tubes. However, during maintenance, the lack of a proper entry and exit route for the serpentine tubes makes replacement difficult. Currently, there are no relevant patent documents or corresponding technologies to guide the replacement of the serpentine tubes in the evaporation zone of this dry quenching coke plant. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a method for replacing serpentine tubes in the evaporation zone of a dry quenching coke oven waste heat boiler, which significantly improves construction efficiency and reduces labor intensity.

[0007] The technical solution adopted to solve the above-mentioned technical problems is: a method for replacing the serpentine tubes in the evaporation zone of a dry-quenching coke oven waste heat boiler, comprising an economizer, an evaporation zone, and a superheater arranged sequentially along the height direction. Platform assemblies are respectively installed between the economizer, the evaporation zone, and the superheater. Each platform assembly extends outward from the corresponding part of the economizer, the evaporation zone, or the superheater. The evaporation zone includes water-cooled walls and serpentine tubes, which are arranged sequentially at specified intervals within the three-dimensional space enclosed by the water-cooled walls. The replacement method first involves... Replace the hoisting tools inside the furnace above the serpentine tubes. At the same time, cut an access channel on the water-cooled wall at the platform component location, allowing at least one serpentine tube to pass through. Then, in units of one, remove and move out the old serpentine tubes to be replaced one by one with the help of the access channel using the hoisting tools. Next, in units of one, move in and replace the new serpentine tubes one by one with the hoisting tools and the access channel. Finally, restore the cut water-cooled wall and corresponding components to complete the replacement of the serpentine tubes in the evaporation zone of the dry quenching coke oven waste heat boiler.

[0008] Furthermore, there are two evaporation zones arranged vertically between the economizer and the superheater, and a platform assembly is also set between the two evaporation zones. The serpentine tubes in each evaporation zone can be replaced independently.

[0009] The preferred method of the above scheme is to also install an auxiliary transfer and hoisting tool on the top platform assembly outside the evaporation zone. The various serpentine tubes transported to the platform assembly by the external crane are transferred to the entrance of the access channel by the auxiliary transfer and hoisting tool, and the serpentine tubes are moved into the evaporation zone by changing the hoisting tool.

[0010] Furthermore, the auxiliary transfer and hoisting tools include a platform beam and a transfer and hoisting tool. The transfer and hoisting tool is movably arranged on the platform beam, which is fixed to the bottom of the corresponding evaporation zone top platform component. The various serpentine pipes transported to the platform component by an external crane are transferred to the entrance of the access channel by the transfer and hoisting tool in cooperation with the platform beam.

[0011] The preferred embodiment of the above scheme is that the platform beam is composed of the support beams of the corresponding platform components, and the transfer and hoisting tool is movably connected to the lifting rings set at the bottom of the support beams via hooks.

[0012] Furthermore, the replacement hoisting tools include at least two sets of flexible hoisting and transfer components. Each set of flexible hoisting and transfer components is evenly distributed in the boiler above the corresponding evaporation zone along the length of the individual serpentine tube. The individual serpentine tubes transferred to the inlet / outlet channel entrance are moved out of or into the evaporation zone by the cooperation of each set of flexible hoisting and transfer components with the hoisting tools. The individual serpentine tubes moved into the evaporation zone are rotated and assembled to the specified position with the cooperation of each set of flexible hoisting and transfer components.

[0013] The preferred embodiment of the above scheme is that each set of flexible hoisting and transfer components includes a wire rope slide, a guide slide, and a replacement hoisting tool. The two ends of the wire rope slide pass through the process holes on the sealing plate and are fixed to the outside of the boiler above the corresponding evaporation zone. The replacement hoisting tool is movably arranged on the wire rope slide in the evaporation zone through the guide slide. Each serpentine tube is hoisted, moved, installed, or disassembled, moved, and removed by the replacement hoisting tool at the corresponding position in cooperation with the corresponding guide slide and wire rope slide.

[0014] Furthermore, one end of each wire rope slide is fixedly connected to a corresponding column at the corresponding position outside the boiler, and the other end of each wire rope slide is adjustablely fixedly connected to another column at the corresponding position outside the boiler via a hand-operated hoist.

[0015] The preferred method of the above scheme is that both the replacement and transfer of lifting tools are accomplished using hand-operated hoists.

[0016] Furthermore, it also includes a winch located outside the boiler. After the old serpentine tubes in the evaporation zone are removed, the new serpentine tubes are transported to the access passage. Then, they are caught by the replacement hoisting tool located above the boiler. The winch then pulls the serpentine tubes along the wire rope slide to the end for installation, fixing, and welding. Installation and welding are carried out from both sides towards the middle until the installation is completed.

[0017] The beneficial effects of this invention are as follows: The technical solution provided in this application combines the existing waste heat boiler, which includes an economizer, an evaporation zone, and a superheater arranged sequentially along the height direction. Platform components are respectively provided between the economizer, the evaporation zone, and the superheater. Each platform component extends outward to the corresponding part of the economizer, the evaporation zone, or the superheater. The evaporation zone includes a water-cooled wall and serpentine tubes. The serpentine tubes are arranged sequentially at specified intervals in the three-dimensional space enclosed by the water-cooled wall. When replacing the serpentine tubes in the three-dimensional space enclosed by the water-cooled wall of the evaporation zone, firstly, an access channel that allows at least one serpentine tube to pass through is cut on the water-cooled wall at the location of the platform component. Then, the old serpentine tubes to be replaced are removed and moved out sequentially by changing the hoisting tools and with the cooperation of the access channel, in units of one tube. Next, the new serpentine tubes are moved in and replaced sequentially by changing the hoisting tools and with the cooperation of the access channel, in units of one tube. Finally, the cut water-cooled wall and corresponding components are restored to complete the replacement of the serpentine tubes in the evaporation zone of the dry quenching coke oven waste heat boiler. Because the technical solution of this application only cuts off a part of the water-cooled wall to form a serpentine tube inlet and outlet channel before replacement, and then removes the old serpentine tube and replaces the new serpentine tube in units through the inlet and outlet channel with the help of hoisting tools, and finally restores the cut-off part of the water-cooled wall, the workload of dismantling the water-cooled wall as a whole in the prior art is greatly reduced, thereby significantly improving construction efficiency and significantly reducing labor intensity. Attached Figure Description

[0018] Figure 1 This is a schematic diagram showing the position and structure of the serpentine tube in the waste heat boiler involved in the replacement method of the serpentine tube in the evaporation zone of the dry quenching coke oven waste heat boiler of the present invention. Figure 2 , Figure 3 These are, respectively, a frontal view and a top view of the serpentine tube and water-cooled wall involved in the replacement method of the serpentine tube in the evaporation zone of the dry quenching coke oven waste heat boiler of the present invention. Figure 4 , Figure 5 These are, respectively, a frontal view and a top view of the serpentine tubes entering and exiting the water-cooled wall involved in the replacement method of the serpentine tubes in the evaporation zone of the dry quenching coke oven waste heat boiler of the present invention. Figure 6 This is a schematic diagram of the structure of the replacement hoisting tool involved in the replacement method of the serpentine tube in the evaporation zone of the dry quenching coke oven waste heat boiler of the present invention.

[0019] The components in the diagram are labeled as follows: Economizer 1, Superheater 2, Platform assembly 3, Water-cooled wall 4, Serpentine tube 5, Inlet / outlet channel 6, Platform beam 7, Wire rope slide 8, Guide slide 9, Hand chain hoist 10, Column 11. Detailed Implementation

[0020] like Figures 1-6The present invention provides a method for replacing serpentine tubes in the evaporation zone of a dry quenching coke oven waste heat boiler, which significantly improves construction efficiency and reduces labor intensity. The replacement method includes an economizer 1, an evaporation zone, and a superheater 2 arranged sequentially along the height direction. Platform components 3 are respectively set between the economizer 1, the evaporation zone, and the superheater 2. Each platform component 3 extends outward from the corresponding part of the economizer 1, the evaporation zone, or the superheater 2. The evaporation zone includes a water-cooled wall 4 and serpentine tubes 5. The serpentine tubes 5 are arranged sequentially at specified intervals in the three-dimensional space enclosed by the water-cooled wall 4. The replacement method first sets up a replacement hoisting tool in the furnace above the serpentine tube to be replaced. At the same time, an access channel 6 that allows at least one serpentine tube 5 to pass through is cut on the water-cooled wall 4 at the position of the platform component 3. Then, the old serpentine tubes to be replaced are removed and moved out sequentially by the replacement hoisting tool with the assistance of the access channel 6, one by one. Then, the new serpentine tubes are moved in and replaced sequentially by the replacement hoisting tool with the assistance of the access channel 6, one by one. Finally, the cut water-cooled wall 4 and the corresponding components are restored to complete the replacement of the serpentine tubes in the evaporation zone of the dry quenching coke oven waste heat boiler. The technical solution provided in this application combines the existing waste heat boiler, which includes an economizer, an evaporation zone, and a superheater arranged sequentially along the height direction. Platform components are respectively set between the economizer, the evaporation zone, and the superheater. Each platform component extends outward to the corresponding part of the economizer, the evaporation zone, or the superheater. The evaporation zone includes water-cooled walls and serpentine tubes. The serpentine tubes are arranged in a three-dimensional space enclosed by the water-cooled walls at a specified interval. When replacing the serpentine tubes in the three-dimensional space enclosed by the water-cooled walls of the evaporation zone, an access channel that allows at least one serpentine tube to pass through is first cut on the water-cooled wall at the location of the platform component. Then, the old serpentine tubes to be replaced are removed and moved out sequentially by changing the hoisting tools and with the assistance of the access channel, one by one. Next, the new serpentine tubes are moved in and replaced sequentially by changing the hoisting tools and with the assistance of the access channel, one by one. Finally, the cut water-cooled walls and corresponding components are restored to complete the replacement of the serpentine tubes in the evaporation zone of the dry quenching coke oven waste heat boiler. Because the technical solution of this application only cuts off a portion of the water-cooled wall to form a serpentine tube inlet and outlet channel before replacement, and then removes the old serpentine tubes and replaces them with new ones in units through the inlet and outlet channels with the help of hoisting tools, and finally restores the cut-off portion of the water-cooled wall, the workload of dismantling the entire water-cooled wall in the prior art is greatly reduced, thereby significantly improving construction efficiency and significantly reducing labor intensity. Considering the existing waste heat boiler's structural feature of having two evaporation zones arranged vertically between the economizer 1 and the superheater 2, and a platform assembly 3 also set between the two evaporation zones, the serpentine tubes 5 in each evaporation zone of this application are replaced independently.

[0021] Accordingly, to facilitate lifting during replacement, this application also provides an auxiliary transfer and lifting tool on the top platform assembly outside the evaporation zone. The various serpentine tubes 5, transported to the platform assembly 3 by an external crane, are transferred to the entrance of the access channel 6 using the auxiliary transfer and lifting tool, and then moved into the evaporation zone using the replacement lifting tool. At this time, the auxiliary transfer and lifting tool includes a platform beam 7 and a transfer lifting tool. The transfer lifting tool is movably arranged on the platform beam 7, which is fixed to the bottom of the corresponding top platform assembly of the evaporation zone. The various serpentine tubes 5, transported to the platform assembly 3 by an external crane, are transferred to the entrance of the access channel 6 using the transfer lifting tool in conjunction with the platform beam 7. More specifically, the platform beam 7 is composed of the support beam of the corresponding platform assembly 3, and the transfer lifting tool is movably connected to the lifting ring at the bottom of the support beam via a hook.

[0022] Furthermore, in order to facilitate the replacement of the serpentine tubes and simplify the structure of the replacement device, the replacement hoisting tool of this application includes at least two sets of flexible hoisting and transfer components. Each set of flexible hoisting and transfer components is evenly distributed in the boiler above the corresponding evaporation zone along the length of the individual serpentine tubes. The individual serpentine tubes 5 transferred to the inlet / outlet channel 6 are moved out of or into the evaporation zone by the cooperation of each set of flexible hoisting and transfer components with the hoisting tool. The individual serpentine tubes 5 moved into the evaporation zone are rotated and assembled to the specified position by the cooperation of each set of flexible hoisting and transfer components. At this point, the preferred structure of each flexible lifting and transfer assembly includes a wire rope slide 8, a guide slide 9, and a replacement lifting tool. Both ends of the wire rope slide 8 pass through process holes in the sealing plate and are fixed to the outside of the boiler above the corresponding evaporation zone. The replacement lifting tool is movably arranged on the wire rope slide 8 within the evaporation zone via the guide slide. Each serpentine tube 5 is lifted, moved, and installed or disassembled, moved, and removed using the replacement lifting tool at its corresponding position in conjunction with the guide slide 9 and the wire rope slide 8. More specifically, one end of each wire rope slide 8 is fixedly connected to a corresponding column 11 at a corresponding position outside the boiler, and the other end of each wire rope slide 8 is adjustablely fixedly connected to another column 11 at a corresponding position outside the boiler via a hand-operated hoist 10. Furthermore, both the replacement lifting tool and the transfer lifting tool in this application are composed of a hand-operated hoist 10. Furthermore, considering the structural feature of having a winch installed outside the boiler, after the old serpentine tubes in the evaporation zone are removed, the new serpentine tubes are transported to the inlet / outlet channel. Then, they are caught by the replacement hoisting tool located above the boiler, and the winch pulls the serpentine tube 5 along the wire rope slide 8 to the end for installation, fixing, and welding. Installation and welding are carried out from both sides towards the middle until the installation is completed.

[0023] In summary, the technical solution provided in this application also has the following advantages: This application relates to the hoisting of serpentine tubes in the evaporation zone of dry quenching coke boilers in the steel industry during maintenance. It adopts a combination of in-boiler hoisting and horizontal movement to improve efficiency, reduce labor intensity, and lower costs. It is applicable to the replacement of pipes in dry quenching coke boilers in the steel industry and can be extended to the replacement of pipes in other steam boilers, thus having promotional value.

[0024] The water-cooled wall tubes are partially dismantled to create an access channel. A hoisting system consisting of wire ropes, guide wheels, and hand-operated hoists is used to ensure that the serpentine tubes in the evaporation zone are transported to the access channel. This facilitates the entry and exit of the serpentine tubes from and from the boiler, reduces the amount of water-cooled wall dismantling work, reduces weld joints, and promotes safe boiler operation.

[0025] 1) Remove pipes and components at the entrance and exit points outside the boiler, open up the external transportation channel, remove the insulation layer of the water-cooled wall tubes, remove 10 water-cooled wall tubes, and fully lay scaffolding boards below the evaporation zone inside the boiler.

[0026] 2) Open holes on the water-cooled wall tubes on both sides above the serpentine tubes in the evaporation zone, install two steel wire rope slides, and fix them to the boiler column. Tighten them with a hand chain hoist, and set up hoisting tools with guide pulleys and hand chain hoists.

[0027] 3) Starting from the middle and moving towards both sides, use hoisting tools to remove the serpentine pipes, transport them to the water-cooled wall entry / exit position, pick them up with external hand-operated hoists, and finally unload them onto the ground by truck.

[0028] 4) The new serpentine tube is transported to the inlet and outlet position of the boiler water-cooled wall, accessed by the hoisting tools inside the boiler, and pulled to the end by the winch for installation and fixing.

[0029] 5) Restore the removed water-cooled wall pipes and pipes on the platform passage until the replacement of the serpentine tubes in the evaporation zone is completed.

[0030] Example 1 The evaporator coils that need to be replaced are divided into upper and lower layers. The lower layer houses the economizer, and the upper layer houses the superheater and steam drum. The boiler is sealed by water-cooled wall tubes. To replace the evaporator coils inside the boiler, one side of the water-cooled wall tubes must be removed to create a passage for the evaporator coils to be removed and transported out, and the new coils to be installed inside the boiler. The specific steps for replacing the coils are as follows. 1) Removing 46 water-cooled wall tubes from one of the sealed walls facilitated the entry and exit of the serpentine tubes in the evaporation zone, but caused significant damage to the water-cooled wall tubes, reducing the safety of the boiler. The large number of water-cooled wall tubes to be restored increased the workload. 2) On the water-cooled wall tubes in the inlet and outlet directions, holes are only opened in the middle to form an outlet channel. The serpentine tubes in the evaporation zone move from both sides towards the middle, entering and exiting along the opening. This reduces the amount of work required to dismantle and restore the water-cooled wall tubes on this side. 3) First, two holes are made on the sealing plate between the water-cooled wall tubes on both sides above the evaporation zone. The steel wire rope is threaded into the boiler and fixed to the column. It is tightened by hand hoist to form a steel wire rope slide. A guide slide is used in conjunction with the hand hoist to form a hoisting tool, which is installed on the steel wire rope slide. The hoisting tool lifts the serpentine tube of the evaporation zone and runs along the steel wire rope slide to the inlet and outlet passage. 4) When the serpentine pipe is transported to the inlet / outlet position, it is connected by an external hand-operated hoist; 5) After the old serpentine tubes in the evaporation zone are removed, the new serpentine tubes are transported to the inlet and outlet positions. Then, the hoisting tools above the boiler are used to catch them, and the winch is used to pull the serpentine tubes along the wire rope slide to the end for installation, fixing, and welding. The installation and welding are carried out from both sides to the middle until the installation is completed. 6) Restore the water-cooled wall pipes at the inlet and outlet positions, restore other components and facilities, and complete the replacement of the serpentine pipes in the evaporation zone; 7) The serpentine tube in the evaporation zone is divided into upper and lower layers. After the lower layer is completed, the upper layer is replaced.

Claims

1. A method for replacing the serpentine tubes in the evaporation zone of a dry-quenching coke oven waste heat boiler, comprising an economizer (1), an evaporation zone, and a superheater (2) arranged sequentially along the height direction, wherein platform components (3) are respectively provided between the economizer (1), the evaporation zone, and the superheater (2), and each platform component (3) extends outward from the corresponding part of the economizer (1), the evaporation zone, or the superheater (2), the evaporation zone including a water-cooled wall (4) and serpentine tubes (5), the serpentine tubes (5) being arranged sequentially at specified intervals in the three-dimensional space enclosed by the water-cooled wall (4), characterized in that: The replacement method first sets up a replacement hoisting tool in the furnace above the serpentine tube to be replaced. At the same time, an access channel (6) is cut on the water-cooled wall (4) at the position of the platform component (3) to allow at least one serpentine tube (5) to pass through. Then, the old serpentine tubes to be replaced are removed and moved out in sequence with the help of the replacement hoisting tool and the access channel (6) in a unit. Next, the new serpentine tubes are moved in and replaced in sequence with the help of the replacement hoisting tool and the access channel (6) in a unit. Finally, the cut water-cooled wall (4) and the corresponding parts are restored to complete the replacement of the serpentine tubes in the evaporation zone of the dry quenching coke oven waste heat boiler.

2. The method for replacing the serpentine tubes in the evaporation zone of a dry-quenching coke oven waste heat boiler according to claim 1, characterized in that: There are two evaporation zones arranged vertically between the economizer (1) and the superheater (2), and a platform assembly (3) is also set between the two evaporation zones. The serpentine tubes (5) in each evaporation zone are replaced independently.

3. The method for replacing the serpentine tubes in the evaporation zone of a dry-quenching coke oven waste heat boiler according to claim 1 or 2, characterized in that: An auxiliary transfer hoisting tool is also provided on the top platform assembly outside the evaporation zone. The various serpentine tubes (5) that are hoisted to the platform assembly (3) by an external crane are transferred to the entrance of the access channel (6) by the auxiliary transfer hoisting tool, and the serpentine tubes (5) are moved into the evaporation zone by changing the hoisting tool.

4. The method for replacing the serpentine tubes in the evaporation zone of a dry-quenching coke oven waste heat boiler according to claim 3, characterized in that: The auxiliary transfer and hoisting tools include a platform beam (7) and a transfer and hoisting tool. The transfer and hoisting tool is movably arranged on the platform beam (7). The platform beam (7) is fixed at the bottom of the corresponding evaporation zone top platform assembly. The various serpentine pipes (5) that are hoisted to the platform assembly (3) by an external crane are transferred to the entrance of the access channel (6) with the cooperation of the platform beam (7) by the transfer and hoisting tool.

5. The method for replacing the serpentine tubes in the evaporation zone of a dry-quenching coke oven waste heat boiler according to claim 4, characterized in that: The platform beam (7) is composed of the support beam of the corresponding platform component (3), and the transfer hoisting tool is movably connected to the lifting ring set at the bottom of the support beam through the hook.

6. The method for replacing the serpentine tubes in the evaporation zone of a dry-quenching coke oven waste heat boiler according to claim 3, characterized in that: The replacement hoisting tool includes at least two sets of flexible hoisting and transfer components. Each set of flexible hoisting and transfer components is evenly distributed in the boiler above the corresponding evaporation zone along the length of the single serpentine tube. The serpentine tubes (5) transferred to the inlet of the inlet / outlet channel (6) are moved out or into the evaporation zone with the cooperation of each set of flexible hoisting and transfer components. The serpentine tubes (5) moved into the evaporation zone are rotated and assembled to the specified position with the cooperation of each set of flexible hoisting and transfer components.

7. The method for replacing the serpentine tubes in the evaporation zone of a dry-quenching coke oven waste heat boiler according to claim 6, characterized in that: Each flexible hoisting and transfer assembly includes a wire rope slide (8), a guide slide (9), and a replacement hoisting tool. The two ends of the wire rope slide (8) pass through the process holes on the sealing plate and are fixed to the outside of the boiler above the corresponding evaporation zone. The replacement hoisting tool is arranged on the wire rope slide (8) in the evaporation zone through the guide slide. Each serpentine tube (5) is hoisted, moved, installed, disassembled, moved, and removed by the replacement hoisting tool at the corresponding position in cooperation with the corresponding guide slide (9) and the wire rope slide (8).

8. The method for replacing the serpentine tubes in the evaporation zone of a dry-quenching coke oven waste heat boiler according to claim 7, characterized in that: One end of each wire rope slide (8) is fixedly connected to the corresponding column (11) at the corresponding position outside the boiler, and the other end of each wire rope slide (8) is fixedly connected to another column (11) at the corresponding position outside the boiler via a hand-operated hoist (10).

9. The method for replacing the serpentine tubes in the evaporation zone of a dry-quenching coke oven waste heat boiler according to claim 8, characterized in that: The replacement and transfer of lifting tools are both made of hand-operated hoists (10).

10. The method for replacing the serpentine tubes in the evaporation zone of a dry-quenching coke oven waste heat boiler according to claim 9, characterized in that: It also includes a winch arranged outside the boiler. After the old serpentine tubes in the evaporation zone are removed, the new serpentine tubes are transported to the inlet and outlet passage. Then, the replacement hoisting tool above the boiler is used to catch them. The winch is then used to pull the serpentine tube (5) along the wire rope slide (8) to the end for installation, fixing and welding. Installation and welding are carried out from both sides to the middle until the installation is completed.

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