An assembling method of a tool for coke tower field cylinder replacement

Abstract

This invention discloses an assembly method for a tooling used for on-site replacement of a coke tower shell. The tooling includes multiple auxiliary replacement components positioned between the outer walls of the coke tower shell at both ends of the shell to be replaced. Reinforcing rings are connected to the outer walls of both the upper and lower shells, and these reinforcing rings are placed within the auxiliary replacement components. A new shell is installed between the upper and lower reinforcing rings, and its outer wall is provided with multiple evenly spaced lifting lugs. Each auxiliary replacement component includes multiple evenly spaced arc-shaped pads fixed to the outer walls of the upper and lower shells. Multiple reinforcing plates are fixed to one side of each pad, with stiffening ribs between them. The upper and lower reinforcing plates and stiffening ribs are symmetrically distributed. A connecting rod is installed between the upper and lower reinforcing plates, its inner side connected to the reinforcing rings. The arc-shaped pads conform to the tower wall in curvature and are made of the same material, ensuring uniform stress on the contact surface. The stiffening ribs are welded to form a stable triangular support, effectively distributing the load. H-beam connecting rods connect the upper and lower reinforcing plates and are welded to the reinforcing rings, constructing a continuous load-bearing frame to avoid deformation or cracking caused by localized stress concentration, thus meeting the requirements for large-scale coke towers.

Description

Technical Field

[0001] This invention specifically relates to an assembly method for a tooling used for on-site replacement of the shell of a coke tower. Background Technology

[0002] In the petrochemical industry, vertical coking towers are the core equipment in delayed coking processes, mainly used to convert heavy oil into light oil, coke, and other products. Because coking towers operate under harsh conditions of high temperature, high pressure, and corrosive media for extended periods, their cylinders are prone to corrosion, cracks, and thinning. When the damage reaches a certain level, on-site replacement and repair of the damaged cylinders are necessary to ensure the safe and stable operation of the coking tower.

[0003] The on-site replacement and repair of the vertical coke tower involves a series of complex technical operations, including tower replacement, heat treatment, high-altitude operations, welding, and hoisting. Before replacing the tower, it is crucial to use tooling to secure the relevant components. This is a key step to ensure the smooth progress of the subsequent repair process, prevent component displacement or deformation, and guarantee the quality of the repair. Currently, the tooling used in the on-site replacement and maintenance of coke tower cylinders is mostly installed and fixed using welding, riveting, and other connection methods, and most of this tooling is located inside the cylinder. During the high-altitude cylinder replacement construction of coke towers, the installation and disassembly space of the tooling is limited, making the operation extremely difficult. This not only increases the risks of high-altitude operations but also results in a cumbersome and inefficient cylinder replacement construction process, making it difficult to meet the construction needs of rapid and safe high-altitude cylinder replacement on site.

[0004] Furthermore, after the coking tower shell is replaced, it needs to undergo heat treatment to eliminate welding stress and ensure its mechanical properties. However, the existing tooling lacks sufficient fixing strength and stability, failing to provide reliable constraint on the shell. During heat treatment, the shell is prone to irregular deformation due to temperature changes, affecting its dimensional accuracy and subsequent assembly quality. In severe cases, this can lead to the repaired shell failing to meet usage requirements. During the assembly of the upper and lower shells of the coking tower, the existing tooling lacks precise positioning and guiding structures, making it difficult to ensure the coaxiality and docking accuracy of the upper and lower shells, and easily resulting in misalignment of the circumferential seams.

[0005] Existing tooling often needs to be custom-made on-site according to the specific dimensions of the coke tower, which results in a long manufacturing cycle and can easily lead to delays in maintenance. At the same time, on-site tooling requires a lot of construction space, which will further aggravate the congestion of the construction site when the space is limited, and increase the risk of interference between cross-operations between different processes.

[0006] Therefore, it is necessary to invent an assembly method for a tooling for on-site replacement of the coke tower shell to solve the above problems. Summary of the Invention

[0007] (a) Purpose of the invention The purpose of this invention is to provide an assembly method for tooling used for on-site replacement of the shell of a coke tower.

[0008] (II) Technical Solution To achieve the above objectives, the present invention provides the following technical solution: an assembly method for a tooling for on-site replacement of a coke tower shell, comprising multiple auxiliary replacement components disposed between the outer walls of the coke tower shell at the upper and lower ends of the shell to be replaced; each of the upper and lower ends of the coke tower shell outer walls is connected to a reinforcing ring, the reinforcing ring is placed inside the auxiliary replacement components, and a new shell is installed between the upper and lower reinforcing rings, the outer wall of the new shell being provided with multiple evenly spaced lifting lugs; the multiple auxiliary replacement components include multiple arc-shaped pads fixed to the outer walls of the upper and lower ends of the coke tower shell, the multiple arc-shaped pads being evenly spaced, and multiple reinforcing plates fixed to one side of the multiple arc-shaped pads, multiple stiffening plates being provided between the multiple reinforcing plates and the multiple arc-shaped pads, the upper and lower reinforcing plates and the stiffening plates being symmetrically arranged, a connecting rod being provided between the upper and lower reinforcing plates, and the inner side of the multiple connecting rods being connected to the reinforcing rings; Its assembly method includes the following steps: S1. Prefabrication of tooling components: S1.1 Select chromium-molybdenum steel strip that matches the material of the coke tower shell as the material of the arc-shaped pad, and prefabricate an arc-shaped structure with a thickness of 26mm, a width of 800mm and a length of 1000mm, and prefabricate the inner diameter of the arc-shaped pad according to 8470mm. S1.2, The reinforcing ring, stiffening plate, reinforcing plate and connecting rod are all prefabricated according to the preset list of Q235B material; among them, the reinforcing ring is prefabricated as a quarter-segment structure, and an isolation layer with a thickness of not less than 6mm is welded on the side where each quarter-segment reinforcing ring is welded to the cylinder. S2. Mark the welding position lines of the reinforcing rings 200mm above and below the coke tower body to be replaced; at the same time, mark the welding position lines of the arc-shaped pads 150mm above and below the welding position lines of the reinforcing rings. S3. Position the prefabricated quarter-section reinforcing rings according to the preset assembly drawing, and use R307G welding rods to perform intermittent welding on the connection between the reinforcing rings and the cylinder; use E5015 welding rods to weld the joints between the segments of the reinforcing rings; preheat the welding area before welding, with a preheating temperature ≥100℃; after welding, grind all welds and perform magnetic particle testing according to standards. S4. Weld the prefabricated arc-shaped backing plate according to the position lines marked in S2, using R307G welding rods, and leave a 10~15mm vent hole at the bottom of the arc-shaped backing plate; preheat the welding area before welding, with a preheating temperature ≥100℃; immediately after welding, perform hydrogen removal treatment on the weld area at 300~350℃; after hydrogen removal treatment, grind the weld and perform magnetic particle testing according to standards; S5. According to the preset assembly drawing, the prefabricated stiffening plates and reinforcing plates are positioned and welded to the coke tower body and reinforcing rings using E5015 welding rods. Before welding, the welding area is preheated to a temperature ≥100℃. Immediately after welding, the weld area is subjected to hydrogen removal treatment at 300~350℃. After hydrogen removal treatment, the weld is ground and subjected to magnetic particle testing according to standards. S6. According to the preset assembly drawing, position and weld the prefabricated connecting rod with the reinforcing plate and reinforcing ring using E5015 welding rods; after welding, grind the weld and perform magnetic particle testing according to the standard to complete the installation of the overall tooling.

[0009] Preferably, each of the reinforcing rings is welded from four reinforcing arc plates, and the reinforcing rings are welded to the lower part of the outer wall of the coke tower cylinder. A reserved groove for installing the new cylinder is reserved at the bottom of the coke tower cylinder. The upper and lower ends of the new cylinder are welded to the inner sides of the upper and lower reinforcing rings and fixed in the reserved groove.

[0010] Preferably, multiple arc-shaped pads are welded to the outer wall of the coke tower, and the arc of the arc-shaped pads matches the arc of the outer wall of the coke tower. The inner side of the reinforcing plate matches the arc of the arc-shaped pads and is welded perpendicularly to the arc-shaped pads. The stiffening plate is placed on top of the reinforcing plate and there are two sets of stiffening plates. The stiffening plate is triangular in shape, and its right-angled sides are welded to one side of the arc-shaped pads and the top of the reinforcing plate, respectively.

[0011] Preferably, the connecting rod is an H-beam, with its two ends welded to the opposite sides of the upper and lower reinforcing plates, and the inner side of the connecting rod is welded to the connection point of the reinforcing ring.

[0012] Preferably, the material of the plurality of arc-shaped pads is the same as that of the coke tower body, and the reinforcing ring, the stiffening plate, the reinforcing plate and the connecting rod are all made of Q235B material.

[0013] Preferably, in S3, the preheating before welding is performed by heating the welding area with an oxyacetylene flame.

[0014] Preferably, in S4, the welding connection between the arc-shaped pad and the coke tower body and the reinforcing ring is fully welded using R307G welding rods, and the vent holes are spaced apart along the length of the arc-shaped pad.

[0015] Preferably, in S5, the welding positions of the stiffening plate, the reinforcing plate and the reinforcing ring correspond to the intermittent weld gap of the reinforcing ring, and the welding depth is not less than two-thirds of the thickness of the stiffening plate and the supporting plate.

[0016] Preferably, in S6, the welding of the connecting rod and the reinforcing plate is double-sided welding, and the weld height is not less than the thickness of the web of the H-beam.

[0017] Compared with the prior art, the beneficial effects of the above-mentioned technical solution of the present invention are: 1. This invention can reduce the difficulty of hoisting and the difficulty of transporting the undisassembled cylinder, thereby reducing the difficulty of equipment hoisting and the complexity of on-site coordination and management; 2. This invention can reduce external pressure, greatly reduce the degree of cylinder deformation, and prevent the cylinder after coke tower replacement from easily deforming due to external pressure during heat treatment. 3. This invention can improve assembly accuracy and prevent the replacement cylinder from having circumferential seam misalignment and straightness deviation with the upper and lower shells during the welding and replacement process due to the influence of the gravity of the external cylinder. 4. This invention not only avoids the time required for hoisting, thereby shortening the overall manufacturing cycle and avoiding site occupation issues, but also reduces the risks during hoisting. Furthermore, the tooling should be selected based on the inner diameter and weight of the equipment on site, has the characteristic of being prefabricated, and has a wide range of applications. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0019] Figure 1 This is a schematic diagram of the overall cylindrical body installation structure of the present invention; Figure 2 This is a schematic diagram of the auxiliary replacement component and reinforcing ring installation structure of the present invention; Figure 3 This is a schematic diagram of the overall structure of the auxiliary replacement component of the present invention; Figure 4 This is a partial structural diagram of the auxiliary replacement component of the present invention; Figure 5 This is a schematic diagram of the novel cylindrical structure of the present invention; Figure 6 This is a schematic diagram of the installation structure of the new cylinder and the coke tower cylinder of the present invention.

[0020] Explanation of reference numerals in the attached figures: 1. Coke tower shell; 11. Reserved slot; 2. Auxiliary replacement assembly; 21. Arc-shaped pad; 22. Reinforcing plate; 23. Rib plate; 24. Connecting rod; 3. Reinforcing ring; 31. Reinforcing arc plate; 4. New shell; 41. Lifting lug. Detailed Implementation

[0021] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0022] This invention provides, for example Figure 1-6 The method for assembling a tooling for on-site replacement of a coke tower shell is shown. It includes multiple auxiliary replacement components 2 set between the outer walls of the coke tower shell 1 at the upper and lower ends of the shell to be replaced. The outer walls of the coke tower shell 1 at both ends are connected to reinforcing rings 3, which are placed inside the auxiliary replacement components 2. A new shell 4 is installed between the upper and lower reinforcing rings 3. The outer wall of the new shell 4 is provided with multiple evenly spaced lifting lugs 41. The multiple auxiliary replacement components 2 include multiple arc-shaped pads 21 fixed to the outer walls of the upper and lower coke tower shell 1. The multiple arc-shaped pads 21 are evenly spaced, and multiple reinforcing plates 22 are fixed on one side of the multiple arc-shaped pads 21. Multiple stiffening plates 23 are provided between the multiple reinforcing plates 22 and the multiple arc-shaped pads 21. The upper and lower reinforcing plates 22 and stiffening plates 23 are symmetrically arranged. A connecting rod 24 is provided between the upper and lower reinforcing plates 22. The inner side of the multiple connecting rods 24 is connected to the reinforcing rings 3. Its assembly method includes the following steps: S1. Prefabrication of tooling components: S1.1 Select chromium-molybdenum steel strip that matches the material of the coke tower shell as the material of the arc-shaped pad, and prefabricate an arc-shaped structure with a thickness of 26mm, a width of 800mm and a length of 1000mm, and prefabricate the inner diameter of the arc-shaped pad according to 8470mm. S1.2, The reinforcing ring, stiffening plate, reinforcing plate and connecting rod are all prefabricated according to the preset list of Q235B material; among them, the reinforcing ring is prefabricated as a quarter-segment structure, and an isolation layer with a thickness of not less than 6mm is welded on the side where each quarter-segment reinforcing ring is welded to the cylinder. S2. Mark the welding position lines for the reinforcing rings 200mm above and below the coke tower body to be replaced; at the same time, mark the welding position lines for the arc-shaped pads 150mm above and below the welding position lines for the reinforcing rings. S3. Position the prefabricated quarter-segment reinforcing rings 3 according to the preset assembly drawing, and use R307G welding rods to perform intermittent welding on the connection between the reinforcing rings and the cylinder; use E5015 welding rods to weld the joints between the segments of the reinforcing rings 3; preheat the welding area before welding, with a preheating temperature ≥100℃; after welding, grind all welds and perform magnetic particle testing according to standards. S4. Weld the prefabricated arc-shaped backing plate according to the position lines marked in S2, using R307G welding rods, and leave a 10~15mm vent hole at the bottom of the arc-shaped backing plate; preheat the welding area before welding, with a preheating temperature ≥100℃; immediately after welding, perform hydrogen removal treatment on the weld area at 300~350℃; after hydrogen removal treatment, grind the weld and perform magnetic particle testing according to standards; S5. According to the preset assembly drawing, the prefabricated stiffening plate 23 and reinforcing plate 22 are positioned and welded to the coke tower body 1 and reinforcing ring 3, using E5015 welding rods; the welding area is preheated before welding, with a preheating temperature ≥100℃; immediately after welding, the weld area is subjected to hydrogen removal treatment at 300~350℃; after hydrogen removal treatment, the weld is ground and subjected to magnetic particle testing according to standards; S6. According to the preset assembly drawing, the prefabricated connecting rod 24 is positioned and welded to the reinforcing plate 22 and the reinforcing ring 3 using E5015 welding rods. After welding, the weld is ground and magnetic particle testing is performed according to the standard to complete the installation of the overall tooling.

[0023] Specifically, each reinforcing ring 3 is welded from four reinforcing arc plates 31, and the reinforcing ring 3 is welded to the lower part of the outer wall of the coke tower body 1. A reserved groove 11 for installing the new body 4 is reserved at the bottom of the coke tower body 1. The upper and lower ends of the new body 4 are welded to the inner side of the upper and lower reinforcing rings 3 and fixed in the reserved groove 11.

[0024] Specifically, multiple arc-shaped pads 21 are welded to the outer wall of the coke tower body 1, and the arc of the arc-shaped pads 21 matches the arc of the outer wall of the coke tower body 1. The inner side of the reinforcing plate 22 matches the arc of the arc-shaped pads 21 and is welded perpendicularly to the arc-shaped pads 21. The stiffening plate 23 is placed on the top of the reinforcing plate 22, and there are two sets. The stiffening plate 23 is triangular in shape, and its right-angled sides are welded to one side of the arc-shaped pads 21 and the top of the reinforcing plate 22, respectively.

[0025] Specifically, the connecting rod 24 is an H-beam, with its two ends welded to the opposite sides of the upper and lower reinforcing plates 22, and the inner side of the connecting rod 24 is welded to the connection point of the reinforcing ring 3.

[0026] Specifically, the material of multiple arc-shaped pads 21 is the same as that of the coke tower body 1, and the reinforcing ring 3, stiffening plate 23, reinforcing plate 22, and connecting rod 24 are all made of Q235B material.

[0027] Specifically, in S3, the preheating before welding is achieved by heating the welding area with an oxyacetylene flame.

[0028] Specifically, in S4, the welding connection between the arc-shaped pad 21 and the coke tower body 1 and the reinforcing ring 3 is fully welded using R307G welding rods, and the vent holes are spaced apart along the length of the arc-shaped pad.

[0029] Specifically, in S5, the welding positions of stiffening plate 23, reinforcing plate 22 and reinforcing ring 3 correspond to the intermittent weld gap of reinforcing ring 3, and the welding depth is not less than two-thirds of the thickness of stiffening plate and supporting plate.

[0030] Specifically, in S6, the welding of the connecting rod 24 and the reinforcing plate 22 adopts double-sided welding, and the weld height is not less than the thickness of the web of the H-beam.

[0031] In this embodiment, the auxiliary replacement assembly 2 is evenly distributed circumferentially along the outer wall of the coke tower body 1 at both the upper and lower ends of the body to be replaced, forming a ring support structure. Reinforcing rings 3 are welded to the outer walls of both the upper and lower ends of the body 1. The reinforcing rings 3 are embedded inside the auxiliary replacement assembly 2 to form a fulcrum. A new body 4 is hoisted between the upper and lower reinforcing rings 3. The outer wall of the new body 4 is provided with evenly distributed lifting lugs 41 for easy hoisting. The bottom is fitted and fixed within the pre-reserved groove 11 of the body 1 to achieve axial positioning.

[0032] Specifically, the arc-shaped pad 21 is made of chromium-molybdenum steel of the same origin as the cylinder 1. It is prefabricated as an arc-shaped part with a thickness of 26mm, a width of 800mm, and a length of 1000mm. The inner diameter is precisely matched with the outer diameter of the cylinder 1 (8470mm), and the curvature is completely in line with the tower wall. It is welded to the designated position of the cylinder 1. At the bottom, 10~15mm ventilation holes are reserved at intervals along the length direction to balance the internal and external air pressure during welding.

[0033] Specifically, the reinforcing plate 22 is made of Q235B material, with its inner side machined to have the same curvature as the arc-shaped pad 21. It is fixed to the pad by vertical welding to form a radial force-bearing carrier. The stiffening plate 23 is a triangular structure made of Q235B material, with two sets symmetrically distributed on the top of the reinforcing plate 22. The right-angled sides are fully welded to the side of the arc-shaped pad 21 and the top of the reinforcing plate 22 to construct a triangular stable support. The connecting rod 24 is an H-beam made of Q235B material, with both ends welded to the outer facade of the upper and lower reinforcing plates 22, and the inner side welded to the outer wall of the reinforcing ring 3 to form a longitudinally continuous force-bearing frame.

[0034] Specifically, the reinforcing ring 3 is composed of four quarter-arc segment reinforcing arc plates 31 spliced ​​together, made of Q235B material; a ≥6mm isolation layer is overlaid on the side welded to the cylinder 1 to avoid cracks caused by direct welding of dissimilar steels. The upper and lower bevels of the new cylinder 4 are welded to the inner side of the reinforcing ring 3, and the bottom is inserted into the reserved groove 11 to achieve double fixation.

[0035] In this invention, the arc-shaped pad is prefabricated using chromium-molybdenum steel strip through rolling and shaping to ensure that the arc tolerance is ≤±2mm; the reinforcing ring is prefabricated in four sections with a pre-reserved welding bevel at the joint; the isolation layer is overlaid by submerged arc welding; the stiffening plates and reinforcing plates are cut to size and then the burrs are ground off; the H-beams are cut into sections and then the bevels are treated.

[0036] Specifically, a laser line projector is used to mark the reinforcing ring welding line 200mm above and below the cylinder to be replaced. Using this line as a reference, arc-shaped pad welding lines are marked 150mm above and below, with the marking deviation controlled within ±1mm.

[0037] Specifically, the segmented reinforcing rings are fixed with temporary supports. After aligning the center according to the assembly drawing, the connection between the reinforcing rings and the cylinder is welded intermittently at 50mm intervals using R307G welding rods. The segmented joints are welded with E5015 welding rods. Before welding, the welding area is heated in a ring with an oxyacetylene flame to 100~120℃. After welding, the weld reinforcement is ground to ≤2mm, and surface cracks are checked using magnetic particle testing (MT).

[0038] Specifically, the pad is positioned according to the markings, and the connection between the pad and the cylinder 1 and the reinforcing ring 3 is fully welded with R307G welding rods, with a weld width ≥12mm; the preheating before welding is the same as S3, and immediately after welding, the weld area is treated with a track-type heater at 300~350℃ to remove hydrogen, kept at the temperature for 2 hours, and then ground and tested by MT after cooling.

[0039] Specifically, the reinforcing plate is positioned to fit the arc-shaped pad, the stiffening plates are placed symmetrically, the welding position avoids the intermittent weld of the reinforcing ring, and E5015 welding rods are used for welding. The welding depth of the stiffening plates, reinforcing plates and reinforcing ring is ≥ 2 / 3 of the component thickness; the preheating, hydrogen removal and testing process is the same as S4.

[0040] Specifically, the two ends of the H-beam connecting rod are fitted to the opposing surfaces of the upper and lower reinforcing plates using a double-sided welding process. The weld height is greater than or equal to the thickness of the H-beam web, and the connection point with the reinforcing ring is fully welded. After welding, the weld is ground and subjected to MT inspection. Once it is confirmed that there are no defects, the tooling installation is completed.

[0041] In this invention, the arc-shaped pad is compatible with the cylinder in terms of material and curvature, ensuring uniform stress on the contact surface during load transfer; the triangular stiffener utilizes the principle of triangular stability to disperse radial loads; and the H-shaped steel connecting rod, with its high cross-sectional moment of inertia, constructs a longitudinal rigid frame to uniformly transfer the self-weight of the new cylinder and the operating load to the original tower body, completely solving the problem of tower deformation or cracking caused by local stress concentration in traditional tooling, and adapting to the trend of larger coke towers.

[0042] In this invention, the reinforcing ring is prefabricated in four segments, with each segment weighing ≤200kg, which is suitable for the lifting capacity of on-site cranes; the arc-shaped pad has reserved ventilation holes to avoid porosity defects during welding and reduce rework rate; the welding of the stiffening plates and reinforcing plates avoids the intermittent welding gap of the reinforcing ring, preventing stress superposition caused by weld superposition, and the overall installation cycle is shortened by 30% compared with traditional tooling.

[0043] In this invention, R307G low-hydrogen welding rods are used for welding chromium-molybdenum steel and Q235B dissimilar steel, while E5015 high-strength welding rods are used for welding structural components, ensuring precise matching. Preheating inhibits the formation of martensite structure, eliminates hydrogen and reduces the content of diffusible hydrogen, and with the help of post-weld MT inspection, the welding defect rate is controlled below 0.1%, ensuring the connection strength.

[0044] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A method of assembling a tooling for coke drum field shell replacement, characterized by: The system includes multiple auxiliary replacement components (2) disposed between the outer walls of the coke tower cylinder (1) at the upper and lower ends of the cylinder to be replaced; each of the outer walls of the coke tower cylinder (1) at the upper and lower ends is connected to a reinforcing ring (3), the reinforcing ring (3) is placed inside the auxiliary replacement components (2), and a new cylinder (4) is installed between the upper and lower reinforcing rings (3), the outer wall of the new cylinder (4) is provided with multiple evenly spaced lifting lugs (41); the multiple auxiliary replacement components (2) include components fixed to the upper and lower ends of the coke tower cylinder (1) Multiple arc-shaped pads (21) on the outer wall are evenly spaced, and multiple reinforcing plates (22) are fixed on one side of each arc-shaped pad (21). Multiple stiffening plates (23) are provided between the multiple reinforcing plates (22) and the multiple arc-shaped pads (21). The upper and lower reinforcing plates (22) and the stiffening plates (23) are symmetrically arranged. A connecting rod (24) is provided between the upper and lower reinforcing plates (22). The inner side of the multiple connecting rods (24) is connected to the reinforcing ring (3). Its assembly method includes the following steps: S1. Prefabrication of tooling components: S1.1 Select chromium-molybdenum steel strip that matches the material of the coke tower shell as the material of the arc pad (21), and prefabricate an arc structure with a thickness of 26mm, a width of 800mm and a length of 1000mm, and prefabricate the inner diameter of the arc pad (21) according to 8470mm. S1.2, the reinforcing ring (3), stiffening plate (23), reinforcing plate (22), and connecting rod (24) are all prefabricated using Q235B material according to the preset list; among them, the reinforcing ring (3) is prefabricated as a quarter-segment structure, and an isolation layer with a thickness of not less than 6mm is welded on the side where each quarter-segment reinforcing ring (3) is welded to the coke tower body (1); S2. Mark the welding position lines of the reinforcing ring (3) at 200mm above and below the coke tower body to be replaced; at the same time, mark the welding position lines of the arc-shaped pad (21) at 150mm above and below the welding position lines of the reinforcing ring (3). S3. Position the prefabricated quarter-segment reinforcing rings (3) according to the preset assembly drawing, and use R307G welding rods to intermittently weld the connection between the reinforcing rings (3) and the coke tower body (1); use E5015 welding rods to weld the joints between the segments of the reinforcing rings (3); preheat the welding area before welding, with a preheating temperature ≥100℃; grind all welds after welding and perform magnetic particle testing according to standards. S4. The prefabricated arc-shaped pad (21) is welded according to the position line marked in S2. R307G welding rod is used for welding, and a 10~15mm vent hole is reserved at the bottom of the arc-shaped pad (21). The welding area is preheated before welding, and the preheating temperature is ≥100℃. After welding, the weld area is immediately subjected to hydrogen removal treatment at 300~350℃. After hydrogen removal treatment, the weld is ground and magnetic particle testing is performed according to the standard. S5. According to the preset assembly drawing, the prefabricated stiffening plate (23) and reinforcing plate (22) are positioned and welded to the coke tower body (1) and reinforcing ring (3) using E5015 welding rods; the welding area is preheated before welding, and the preheating temperature is ≥100℃; the weld area is immediately treated with hydrogen removal at 300~350℃ after welding; after hydrogen removal treatment, the weld is ground and magnetic particle testing is performed according to the standard. S6. According to the preset assembly drawing, the prefabricated connecting rod (24) is positioned and welded with the reinforcing plate (22) and the reinforcing ring (3) using E5015 welding rods. After welding, the weld is ground and magnetic particle testing is performed according to the standard to complete the installation of the overall tooling.

2. The assembling method of a tool for coke drum in-place shell replacement according to claim 1, characterized in that: Each of the reinforcing rings (3) is welded together from four reinforcing arc plates (31), and the reinforcing rings (3) are welded to the lower part of the outer wall of the coke tower body (1), and a reserved groove (11) for installing the new body (4) is reserved at the bottom of the coke tower body (1). The upper and lower ends of the new body (4) are welded to the inner side of the upper and lower reinforcing rings (3) and fixed in the reserved groove (11).

3. The assembling method of a tool for coke drum in-place shell replacement according to claim 1, characterized in that: Multiple arc-shaped pads (21) are welded to the outer wall of the coke tower body (1), and the arc of the arc-shaped pads (21) fits the arc of the outer wall of the coke tower body (1). The inner side of the reinforcing plate (22) matches the arc of the arc-shaped pads (21) and is welded perpendicularly to the arc-shaped pads (21). The stiffening plate (23) is placed on the top of the reinforcing plate (22) and there are two sets. The stiffening plate (23) is triangular in shape, and its right-angled sides are welded to one side of the arc-shaped pads (21) and the top of the reinforcing plate (22) respectively.

4. The assembling method of a tool for coke drum in-place shell replacement according to claim 1, characterized in that: The connecting rod (24) is an H-beam, with its two ends welded to the opposite sides of the upper and lower reinforcing plates (22). The inner side of the connecting rod (24) is welded to the connection point of the reinforcing ring (3).

5. The assembly method of the tooling for on-site replacement of the shell of a coke tower according to claim 1, characterized in that: The material of the multiple arc-shaped pads (21) is the same as that of the coke tower body (1), and the reinforcing ring (3), the stiffening plate (23), the reinforcing plate (22), and the connecting rod (24) are all made of Q235B material.

6. The assembly method of the tooling for on-site replacement of the shell of a coke tower according to claim 1, characterized in that: In S3, preheating before welding is achieved by heating the welding area with an oxyacetylene flame.

7. The assembly method of the tooling for on-site replacement of the shell of a coke tower according to claim 1, characterized in that: In S4, the arc-shaped pad (21) is fully welded to the coke tower body (1) and the reinforcing ring (3) using R307G welding rods, and the vent holes are spaced along the length of the arc-shaped pad.

8. The assembly method of the tooling for on-site replacement of the shell of a coke tower according to claim 1, characterized in that: In S5, the welding positions of the stiffening plate (23), the reinforcing plate (22) and the reinforcing ring (3) correspond to the intermittent weld gap of the reinforcing ring (3), and the welding depth is not less than two-thirds of the thickness of the stiffening plate and the supporting plate.

9. The assembly method of the tooling for on-site replacement of the shell of a coke tower according to claim 1, characterized in that: In S6, the welding of the connecting rod (24) and the reinforcing plate (22) adopts double-sided welding, and the weld height is not less than the thickness of the web of the H-beam.

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