Fixing device for replacing upper header of waste heat boiler suspension type module

Abstract

The utility model belongs to the technical field of power generation industrial equipment, and particularly relates to a fixing device for replacing an upper header of a waste heat boiler suspension type module, the fixing device comprises a supporting structure and an anti-roll structure, the supporting structure is arranged at the bottom of the specified suspension type module, and a base frame, an adjusting rib plate and a protection base plate form a whole; the adjusting rib plate is composed of a first height adjusting rib plate and a second height adjusting rib plate, and the first height adjusting rib plate and the second height adjusting rib plate are arranged at the joint of the base frame and the bottom of the specified suspended module to form a height-adjustable fulcrum; the anti-roll structure comprises a first structure part, a second structure part and a third structure part, and the front face of the suspension type module is connected with a shockproof support adjacent to the suspension type module in the waste heat boiler through the first structure part so as to prevent the suspension type module from roll or deviation. The device has the characteristic of preventing the suspended module from shifting after the upper header is cut and moved away.

Description

Technical Field

[0001] This utility model belongs to the technical field of auxiliary equipment for power generation industry, and specifically relates to a fixing device for replacing the upper header of the suspended module of the waste heat boiler. Background Technology

[0002] In existing technologies, most 9F combined cycle units are equipped with waste heat boilers manufactured by domestic companies using imported technology. Because these boilers operate on a daily start-stop system, components such as the upper header connected to the suspended modules experience shortened lifespans or corrosion and aging, requiring modification, replacement, or repair. Since the suspended modules' positioning stress points are located on the upper header, and existing technologies lack protective structures for these modules, modifying or removing the upper header during repairs disrupts the positioning stress points of the suspended modules, causing them to shift and resulting in equipment damage.

[0003] A search of Chinese patent announcements reveals that while some technical solutions for treating waste heat boiler exhaust gas are disclosed, such as the utility model application with application number 2022112344230 entitled "Method for Constructing a Waste Gas and Waste Liquid Waste Heat Boiler," which involves incinerating waste gas and waste liquid to achieve standard emissions, utilizing high-temperature flue gas waste heat to reduce environmental pollution, and simultaneously saving energy through waste heat utilization; it can also improve construction efficiency, enhance construction quality, and shorten the construction cycle; however, it has the problem of not being applicable to the modular concept of replacing and treating the upper header of the waste heat boiler equipped in the 9F combined cycle unit. Application No. 2023112288786, entitled "A New Type of 350MW Ultra-Supercritical Lignite Boiler and Its Design Method," describes a method to improve boiler steam operating parameters by replacing the water-cooled wall tubes in the lower furnace, thickening the upper furnace water-cooled wall tubes, installing two headers for the upper headers of the side wall water-cooled walls and front water-cooled walls, reducing the height of the diaphragms of the side wall water-cooled walls near the front wall above the ceiling, changing the material of the header tube legs, and replacing the first-stage reheater with a high-temperature reheater and a low-temperature reheater. However, it has the problem of not being suitable for the modular replacement and handling of the upper header of the waste heat boiler equipped in 9F combined cycle units. Application No. 2016105969059, entitled "A Utility Model of a Flexible Suspended Modular Building Structure," essentially uses suspension vibration reduction technology to significantly reduce the horizontal load input from the modules to the core tube structure, saving the amount of material used in the core tube structure. Modular architecture allows for inter-story displacement of the secondary structure, avoiding damage to non-structural components while relaxing the limits on inter-story displacement, thereby improving energy dissipation and vibration reduction efficiency. However, it presents challenges in adapting to the modular concept of replacing and handling the upper header of the waste heat boiler in a 9F combined cycle unit. Therefore, a method and fixing device for replacing the upper header of a suspended module waste heat boiler is needed to solve the problem of replacing or removing the upper header for repair when using suspended modules of waste heat boilers. Utility model content:

[0004] The purpose of this utility model is to solve the problem that the positioning and stress points of the suspended module are destroyed after the upper header is cut open and removed in the existing technology, which causes the suspended module to shift and damage the equipment. The present invention provides a fixing device for replacing the upper header of the suspended module of the waste heat boiler, which has the characteristics and effects of preventing the suspended module from shifting after the upper header is cut open and removed, so as to ensure the quality of restoration.

[0005] To achieve the objective of this utility model, the following technical solutions can be adopted:

[0006] A fixing device for replacing the upper header of a suspended module of a waste heat boiler is characterized by the following structural features: the fixing device includes a support structure and an anti-tilting structure. The support structure is located at the bottom of the designated suspended module and is composed of a base frame, adjusting ribs, and protective pads as a whole. The adjusting ribs consist of a first height adjusting rib and a second height adjusting rib, which are located at the connection between the base frame and the bottom of the designated suspended module to form a height-adjustable support point. The protective pads consist of a first protective pad and a second protective pad, forming the protective pad structure for the lower header. The dimensions of the first and second protective pads are the same as those of the lower header. The pipe diameters are matched to form a tight-fitting protective structure; the anti-tilting structure includes a first structural part, a second structural part, and a third structural part. The front of the designated suspended module is connected to the adjacent anti-vibration bracket in the waste heat boiler through the first structural part. The anti-vibration bracket is connected to the suspended module adjacent to the front of the designated suspended module. The left and right sides of the designated suspended module are respectively connected to the untreated suspended modules or side walls adjacent to the left and right sides of the designated suspended module in the waste heat boiler through the second and third structural parts to prevent the suspended module from tilting or shifting. The designated suspended module is a suspended module whose top is connected to the upper header to be replaced.

[0007] To achieve the objectives of this utility model, the following technical solutions may also be adopted:

[0008] Furthermore, the supporting structure, which bears the load of the suspended module, is an integral structure including a base support frame and a support base. The base frame consists of support frame columns, a top frame, and a bottom frame, with the bottom frame fixed to the floor of the waste heat boiler room via the support base. Several through holes are provided in the floor slab of the waste heat boiler room, through which the supporting structure passes and pushes upwards against the lower header of the suspended module tube panel. The first structural part of the anti-tilting structure has a three-layer anti-tilting connection structure: an upper anti-tilting connection structure, a middle anti-tilting connection structure, and a lower anti-tilting connection structure. The structure includes a connecting structure and a lower anti-tilting connection structure; the three-layer anti-tilting connection structure is connected to the adjacent suspended module on the front through a three-layer anti-vibration bracket in the waste heat boiler; the second and third structural parts of the anti-tilting structure each have three layers of anti-tilting structure, which are connected to the adjacent suspended modules on the left and right sides through a three-layer anti-vibration bracket in the waste heat boiler or directly connected to the side wall of the waste heat boiler room; when directly connected to the side wall of the waste heat boiler room, one end of the second and third structural parts is welded to the side wall column, and the other end is pressed against the anti-vibration bracket of the suspended module.

[0009] Furthermore, the first and second height adjusting ribs serve to secure the lower header ribs. They are made of 20mm thick semi-circular arc steel plates, with two plates at each tightening point. They are prefabricated to match the semi-circular arc plates, with a length of 250mm. The arc dimension corresponds to the outer diameter of the lower header. The length of the semi-circular arc plates is cut according to the site height. The semi-circular arc steel plates of the first and second height adjusting ribs have matching shapes. The first and second protective pads serve as protective plates for the lower header. They are made of 10mm thick steel plates and are semi-circular tile-shaped. The semi-circular tile-shaped plates of the first and second protective pads have similar shapes. After being tightened, the first and second protective pads are welded and fixed to the first and second height adjusting ribs.

[0010] Furthermore, the first structural part of the anti-tilt structure is composed of a frame structure made up of several sets of H-beams and channel steel to prevent the designated suspended module from tilting backward (front). The second and third structural parts of the anti-tilt structure are each composed of channel steel structures. The size of the channel steel structure matches the gap between the left and right sides of the designated suspended module and the furnace wall. A channel steel structure is set at the height of each anti-vibration bracket, and the channel steel structure is welded to the anti-vibration bracket to form a fixed structure to prevent tilting to the left and right sides.

[0011] Furthermore, the anti-tilting structure has a three-layer structure, including a first layer, a second layer, and a third layer of anti-seismic frame structure. The first layer, the second layer, and the third layer of anti-seismic frame structure include a support unit made of H-beams. One side of the support unit is attached to the anti-seismic bracket of the waste heat boiler, and its two ends are welded to the columns on both sides of the waste heat boiler.

[0012] Furthermore, the first, second, and third anti-rollback frame structures formed by the anti-rollback structure are vertically connected to two adjacent suspended modules to form a multi-layer anti-rollback structure.

[0013] Furthermore, the anti-tilting structure includes, in addition to the first, second, and third anti-vibration frame structures, several channel steels. These channel steels are filled into the gaps between the suspended module and the furnace wall and spot-welded to the anti-vibration support of the waste heat boiler to prevent left and right tilting.

[0014] This utility model has the following beneficial effects:

[0015] 1. The present invention relates to a fixing device for replacing the upper header of a suspended module of a waste heat boiler. This device features a support structure at the bottom of the suspended module and an anti-tilting structure on its side. The support structure consists of a base frame, adjusting ribs, and protective pads. The first and second height adjusting ribs are positioned at the connection between the base frame and the bottom of the suspended module to form a height-adjustable support point. The dimensions of the first and second protective pads are matched to the diameter of the lower header pipe to form a close-fitting protective structure. The anti-tilting structure is installed between the two suspended modules to prevent them from tilting forward or backward. Therefore, this invention solves the problem in existing technologies where the positioning stress point of the suspended module is destroyed after the upper header is cut open and removed, leading to module displacement and equipment damage. It prevents module displacement after the upper header is cut open and removed, ensuring quality restoration.

[0016] 2. This utility model supports the weight of the module being processed by setting a bottom support device, which, after installation, firmly presses against the lower headers and the ground to prevent the module from sinking. An anti-tilting device keeps each module's tube panel in its original position, and after installation, it firmly presses against the two modules and the side walls to prevent lateral tilting or displacement. Therefore, it solves the problem in existing technologies where the positioning and stress points of the suspended module are destroyed after the upper header is cut open and removed, leading to module displacement and equipment damage. It has the characteristics and effect of preventing module displacement after the upper header is cut open and removed, thus ensuring the quality of restoration. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the support structure for the fixing device involved in this utility model.

[0018] Figure 2 This is a schematic diagram of the support structure of the fixing device involved in this utility model.

[0019] Figure 3 This is a schematic diagram of the structure of the first height adjustment rib involved in this utility model.

[0020] Figure 4 This is a schematic diagram of the structure of the second height adjustment rib involved in this utility model.

[0021] Figure 5 This is a schematic diagram of the structure of the first protective pad involved in this utility model.

[0022] Figure 6 This is a schematic diagram of the structure of the second protective pad involved in this utility model.

[0023] Figure 7 This is a schematic diagram of the anti-tilting application structure of the fixing device involved in this utility model.

[0024] Figure 8 This is a schematic diagram of the anti-side structure of the fixing device involved in this utility model. Detailed Implementation

[0025] Reference Figures 1-8 The present invention relates to a fixing device for replacing the upper header of a suspended module of a waste heat boiler, specifically embodiment 1. This fixing device includes a support structure and an anti-tilting structure. The support structure is located at the bottom of the designated suspended module 5 and consists of a base frame 1, adjusting ribs 2, and protective pads 3, forming a whole, which is fixed to the ground 20 by a support seat 9. The adjusting ribs 2 consist of a first height adjusting rib 2-1 and a second height adjusting rib 2-2, which are located at the connection between the base frame 1 and the bottom of the designated suspended module 5 to form a height-adjustable support point. The protective pads 3 consist of a first protective pad 3-1 and a second protective pad 3-2, forming the protective pad structure of the lower header 4. The structure consists of a first protective pad 3-1 and a second protective pad 3-2, the dimensions of which match the pipe diameter of the lower header 4 to form a tight-fitting protective structure. The anti-tilting structure includes a first structural part, a second structural part, and a third structural part. The first structural part is located on the front of the designated suspended module 5 and is connected to the adjacent suspended module on the front through an anti-vibration bracket in the waste heat boiler. The second and third structural parts are located on the left and right sides of the designated suspended module 5 and are connected to the adjacent suspended modules on the left and right sides through anti-vibration brackets in the waste heat boiler, or directly connected to the side wall of the waste heat boiler room, to prevent the suspended module 5 from tilting or shifting. The designated suspended module 5 is a suspended module whose top is connected to the upper header to be replaced.

[0026] In this embodiment:

[0027] Reference Figure 1 and Figure 2The supporting structure serves as the load-bearing structure for the suspended module 5. The supporting structure is an integral structure, including a base support frame 1 and a support base 9. The base frame 1 consists of support frame columns 1-1, a top frame 1-2, and a bottom frame 1-3. The bottom frame 1-3 is fixed to the waste heat boiler room floor 20 via the support base 9. Several through holes 7 are provided in the floor slab of the waste heat boiler room. The supporting structure passes through these through holes 7 and is then pushed upwards against the lower header 4 of the suspended module 5's pipe panel. The first structural part of the anti-tilting structure has a three-layer anti-tilting connection structure: an upper anti-tilting connection structure... 8-1, middle layer anti-tilt connection structure 8-2 and lower layer anti-tilt connection structure 8-3; the three-layer anti-tilt connection structure is connected to the adjacent suspended module on the front through the three-layer anti-vibration bracket in the waste heat boiler; the second and third structural parts of the anti-tilt structure each have three layers of anti-tilt structure, which are connected to the adjacent suspended module on the left and right sides through the three-layer anti-vibration bracket in the waste heat boiler or directly connected to the side wall of the waste heat boiler room; when directly connected to the side wall of the waste heat boiler room, one end of the second and third structural parts is welded to the side wall column and the other end is pressed against the anti-vibration bracket of the suspended module.

[0028] The modular tube panel of the waste heat boiler is supported by the supporting structure and the furnace wall steel columns 6.

[0029] The first height adjusting rib 2-1 and the second height adjusting rib 2-2 serve to secure the lower header rib. They are made of ordinary 20mm thick semi-circular arc steel plates. There are two plates at each clamping point. They are prefabricated to be semi-circular arc plates with a length of about 250mm. The arc size is related to the outer diameter of the lower header. The length of the semi-circular arc plate is cut according to the site height. The semi-circular arc steel plates of the first height adjusting rib 2-1 and the second height adjusting rib 2-2 have similar shapes, but different arc sizes.

[0030] The first protective pad 3-1 and the second protective pad 3-2 serve as protective plates for the lower header. They are both made of ordinary 10mm thick steel plates and are semi-circular in shape. The semi-circular plates of the first protective pad 3-1 and the second protective pad 3-2 are similar in appearance, but the arc size is different. After the first protective pad 3-1 and the second protective pad 3-2 are tightened, they are welded and fixed to the first height adjusting rib 2-1 and the second height adjusting rib 2-2. Welding to the lower header is not allowed.

[0031] Before inserting the first height adjusting rib 2-1 and the second height adjusting rib 2-2, gently lift the first protective pad 3-1 and the second protective pad 3-2 together with the lower header of the tube panel using a jack. Measure the height of the first height adjusting rib 2-1 and the second height adjusting rib 2-2, then insert the first height adjusting rib 2-1 and the second height adjusting rib 2-2 so that they are tightly attached together. Finally, weld and reinforce the base frame 1, the first height adjusting rib 2-1 and the second height adjusting rib 2-2, the first protective pad 3-1 and the second protective pad 3-2.

[0032] The first structural part of the anti-tilt structure consists of a frame structure composed of several sets of H-beams and channel steel to prevent the designated suspended module from tilting backward (front). The second and third structural parts of the anti-tilt structure are each composed of channel steel structures. The dimensions of the channel steel structures are matched with the gaps between the left and right sides of the designated suspended module and the furnace wall. A channel steel structure is set at the height of each anti-vibration support, and the channel steel structures are welded to the anti-vibration support to form a fixed structure that prevents tilting to the left and right sides.

[0033] The anti-tilt structure forms a first, second, and third layer of seismic-resistant frame structure, which is vertically connected to two adjacent suspended modules to form a multi-layer anti-tilt structure.

[0034] Each anti-tilt frame is made of H-beams and channel steel, assembled on site. The frame is vertically clamped between the front and rear modules, as close as possible to the anti-vibration support of the tube screen, and has a certain internal tension. The five layers of anti-tilt frames are evenly distributed in the middle of the reinforced modules.

[0035] To prevent the modules from tilting, channel steel with a gap close to the module is inserted into the gap between the module and the two side walls. One of these steels is installed at each anti-vibration bracket height and spot-welded to the anti-vibration bracket.

[0036] Support base 9 acts as a base and is made of ordinary I-beams of grade 500. It is cut into four lengths according to the ground conditions and the height above the ground, and then welded into a whole. Each pipe panel has two clamping points in its lower header.

[0037] The method for replacing the upper header of the suspended module of the waste heat boiler involved in this specific embodiment is characterized by:

[0038] 1) A support structure is provided at the bottom of the designated suspended module in the waste heat boiler, and anti-tilting structures are provided on the front and left and right sides of the suspended module; the suspended module is located on the bottom surface of the upper header to be replaced.

[0039] 2) The weight of the specified suspended module is supported by a support structure, specifically: the upper part of the support structure is pressed against the bottom of the specified suspended module, and the lower part is pressed against the ground to prevent the specified suspended module from sinking;

[0040] 3) The anti-tilting structure is used to keep adjacent suspended modules in their original positions. Specifically, the front of the designated suspended module is connected to the anti-vibration bracket in the waste heat boiler through the first part of the anti-tilting structure. The anti-vibration bracket is connected to the suspended module adjacent to the front of the designated suspended module. The left and right sides of the designated suspended module are respectively connected to the untreated suspended modules or side walls adjacent to the left and right sides of the designated suspended module in the waste heat boiler through the second and third parts of the anti-tilting structure, so as to prevent the suspended module from tilting or shifting.

[0041] 4) Cut off the upper header located above the designated suspended module. During the cutting process, take measurements and check to control the offset within the set range.

[0042] Furthermore, in point 1), when setting up the support structure, the furnace wall is cut open at the bottom of the designated suspended module to form an opening. The support structure is then set at the bottom of the designated suspended module through the opening. The top of the support structure is pressed against the bottom of the designated suspended module, and the bottom of the support structure is pressed against the ground, thus providing support for the designated suspended module.

[0043] Furthermore, point 4) refers to the measurement and inspection during the excision process to control the offset within 10mm, which means controlling the offset within 10mm.

[0044] The actual construction process in this embodiment is as follows:

[0045] Transport the H-beams and channel steel to the waste heat boiler site and remove the insulation structure layer of the connecting pipes of the lower header at the bottom of the boiler module; in the furnace located at the bottom of the suspended module to be treated, 500mm away from both sides of the header end cap of each lower header, cut open the inner lining plate, remove the insulation and outer protective plate, and specifically cut six support installation holes with a size of 1000mm*600mm.

[0046] Six sets of supports are formed at the support mounting holes using H-beams. These six sets of supports are interconnected to form the base frame 1 of the support structure. These six sets of supports extend from the bottom 0-meter layer of the waste heat boiler through the furnace wall to the bottom of the lower header.

[0047] At the bottom of the lower header, there are six horizontally arranged H-beams, each 500mm long. Three supports are welded on top of the H-beams and are fixedly connected to the bottom of the lower header to form a support unit structure. The supports are located 500mm away from both ends of the end cap of each lower header.

[0048] Since there is a gap of about 100mm on the left and right sides of the suspension module to be processed, close to the furnace wall, or a channel steel of similar size is inserted into the gap, one channel steel is set at each height of each anti-vibration bracket, and the channel steel is welded to the anti-vibration bracket to form a fixed structure to prevent tilting to the left and right sides.

[0049] Note: Taking the cut-off part as the front of the suspension module as an example, since the suspension module and the back set of suspension modules are connected by the original design anti-vibration bracket, which provides support, it will not tilt backward. Therefore, it is not necessary to consider adding a support to prevent it from tilting backward. That is, since the anti-tilt mechanism is mainly designed to prevent the suspension module from tilting forward, the first part of the anti-tilt structure is set on the front, and the second and third parts are set on the left and right sides of the suspension module. There is no need to set an anti-tilt structure on the back.

[0050] Because the original design of the waste heat boiler has two to four layers of anti-vibration supports between two adjacent suspension modules, an operating platform is erected about 1 meter below each layer of anti-vibration supports. The anti-vibration supports are the original anti-vibration supports installed on the waste heat boiler suspension modules, with a total of three layers. H-beams are used for support at the first, second, and third layers of the three-layer anti-vibration supports. One side of the H-beams is close to the anti-vibration supports, and both ends are welded to the columns on both sides of the boiler, forming a three-layer anti-tilting structure.

[0051] The H-beams used for support and the anti-vibration brackets of the rear module are welded and fixed with channel steel; the two layers of anti-vibration brackets below the module being treated are welded and fixed with channel steel and the anti-vibration brackets of the rear module.

[0052] Mark the position and elevation of the finned tubes and columns at the height of each layer of the anti-seismic support to facilitate monitoring of module settlement during pipe cutting and header installation.

[0053] In summary, this utility model is applicable to the modification, replacement, or repair of suspended modules in waste heat boilers when the upper header is removed. These suspended modules, weighing tens of tons, are fixed to the I-beams at the top of the furnace wall by the lugs of the upper header on the tube panel. When replacing the upper header, the suspended module loses its load-bearing fixation, causing it to sag and tip over. Therefore, before removing the lugs when replacing the upper header, a bottom support device and an anti-tilting device must be installed to prevent the module from shifting. Care should be taken during the feeding of the support material to avoid collisions with the finned tubes inside the furnace.

Claims

1. A fixing device for replacing the upper header of a suspended module of a waste heat boiler, characterized in that: The fixing device includes a support structure and an anti-tilting structure. The support structure is set at the bottom of the designated suspended module (5) and is composed of a base frame (1), an adjusting rib (2), and a protective pad (3). The adjusting rib (2) is composed of a first height adjusting rib (2-1) and a second height adjusting rib (2-2). The first height adjusting rib (2-1) and the second height adjusting rib (2-2) are set at the connection between the base frame (1) and the bottom of the designated suspended module (5) to form a height-adjustable support point. The protective pad (3) is composed of a first protective pad (3-1) and a second protective pad (3-2), forming the protective pad structure of the lower header (4). The size of the protective plate (3-2) matches the pipe diameter of the lower header (4) to form a tight protective structure; the anti-tilting structure includes a first structural part, a second structural part and a third structural part. The first structural part is set on the front of the designated suspended module (5) and connected to the adjacent suspended module on the front through the anti-vibration bracket in the waste heat boiler; the second and third structural parts are set on the left and right sides of the designated suspended module (5) and connected to the adjacent suspended modules on the left and right sides through the anti-vibration bracket in the waste heat boiler or directly connected to the side wall of the waste heat boiler room to prevent the suspended module (5) from tilting or shifting; the designated suspended module (5) is a suspended module whose top is connected to the upper header to be replaced.

2. The fixing device for replacing the upper header of a suspended module of a waste heat boiler according to claim 1, characterized in that: The supporting structure serves as the load-bearing structure for the suspended module (5). It is an integral structure, including a base frame (1) and a support seat (9). The base frame (1) is composed of a support frame column (1-1), a top frame (1-2), and a bottom frame (1-3). The bottom frame (1-3) is fixed to the floor (20) of the waste heat boiler room by the support seat (9). Several through holes (7) are provided on the floor of the waste heat boiler room. The supporting structure passes through the through holes (7) and is then pushed upwards to tighten the lower header (4) of the suspended module (5) pipe screen. The first structural part of the anti-tilting structure has a three-layer anti-tilting connection structure, namely: the upper layer The anti-tilt connection structure consists of three layers: a middle layer anti-tilt connection structure (8-2) and a lower layer anti-tilt connection structure (8-3). The three-layer anti-tilt connection structure is connected to the adjacent suspended module on the front side through a three-layer anti-vibration bracket in the waste heat boiler. The second and third structural parts of the anti-tilt structure each have three layers of anti-tilt structure, which are connected to the adjacent suspended modules on the left and right sides through a three-layer anti-vibration bracket in the waste heat boiler or directly connected to the side wall of the waste heat boiler room. When directly connected to the side wall of the waste heat boiler room, one end of the second and third structural parts is welded to the side wall column, and the other end is pressed against the anti-vibration bracket of the suspended module.

3. The fixing device for replacing the upper header of a suspended module of a waste heat boiler according to claim 2, characterized in that: The first height adjusting rib (2-1) and the second height adjusting rib (2-2) serve to secure the lower header rib. The material is ordinary 20mm thick semi-circular arc steel plate. There are two plates at each tightening point. They are prefabricated into semi-circular arc plates with a length of about 250mm. The arc size is related to the outer diameter of the lower header. The length of the semi-circular arc plate is cut according to the site height. The semi-circular arc steel plates of the first height adjusting rib (2-1) and the second height adjusting rib (2-2) have similar shapes, but different arc sizes.

4. The fixing device for replacing the upper header of a suspended module of a waste heat boiler according to claim 2, characterized in that: The first protective pad (3-1) and the second protective pad (3-2) serve as protective plates for the lower header. They are made of ordinary 10mm thick steel plates and are semi-circular in shape. The semi-circular plates of the first protective pad (3-1) and the second protective pad (3-2) are similar in appearance, but the arc size is different. After the first protective pad (3-1) and the second protective pad (3-2) are tightened, they are welded and fixed to the first height adjusting rib (2-1) and the second height adjusting rib (2-2). Welding to the lower header is not allowed.

5. The fixing device for replacing the upper header of a suspended module of a waste heat boiler according to claim 2, characterized in that: The first structural part of the anti-tilt structure consists of a frame structure composed of several sets of H-beams and channel steel to prevent the designated suspended module from tilting backward, i.e., tilting to the front of the suspended module. The second and third structural parts of the anti-tilt structure are each composed of channel steel structures. The dimensions of the channel steel structures are matched with the gaps between the left and right sides of the designated suspended module and the furnace wall. A channel steel structure is set at the height of each anti-vibration bracket, and the channel steel structures are welded to the anti-vibration bracket to form a fixed structure that prevents tilting to the left and right sides.

6. The fixing device for replacing the upper header of a suspended module of a waste heat boiler according to claim 2, characterized in that: The anti-tilt structure forms a first, second, and third layer of seismic-resistant frame structure, which is vertically connected to two adjacent suspended modules to form a multi-layer anti-tilt structure.

7. The fixing device for replacing the upper header of a suspended module of a waste heat boiler according to claim 2, characterized in that: Each anti-tilt frame is made of H-beams and channel steel, and is assembled on site. The frame is vertically inserted between the front and rear modules, as close as possible to the anti-vibration support of the tube screen, and has a certain internal tension. The five layers of anti-tilt frames are evenly distributed in the middle of the reinforced modules.

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