Boiler air preheating device and installation process thereof

Abstract

The application relates to a boiler air preheating device, belonging to the field of boiler air preheaters, which comprises a mounting base, the mounting base is connected with a fixed shaft, a rotating sleeve is sleeved on the fixed shaft, the rotating sleeve is rotationally connected with the mounting base, a plurality of layers of mounting racks are arranged on the fixed sleeve, heat exchange assemblies are arranged on each layer of the mounting racks; a plurality of mounting plates are further arranged, each mounting plate is provided with a plug rod, a plurality of first plug holes are formed in the circumferential surface of the mounting rack, and the first plug rods can be inserted into the first plug holes; adjacent mounting plates are connected through connecting assemblies, the mounting plates are driven to rotate around the fixed shaft through driving assemblies; a cross beam is connected to the top of the fixed shaft; a connecting shell is further arranged, and the connecting shell is rotationally connected with the top and the bottom of all the mounting plates through circumferential sealing assemblies. The application has the effect of being beneficial to relieving the adverse influence of thermal deformation on the sealing fit.

Description

Technical Field

[0001] This application relates to the field of boiler air preheater technology, and in particular to a boiler air preheating device and its installation process. Background Technology

[0002] Boiler air preheating equipment is typically installed in the flue gas duct at the tail end of the boiler. It is used to preheat the air entering the boiler using the heat from the boiler exhaust gas, thereby improving combustion efficiency and reducing exhaust heat loss. Existing boiler air preheating equipment commonly features a rotor mounted around a fixed or rotating shaft. Heat exchange elements are arranged on the rotor, and an outer shell structure is installed outside the rotor to enclose the flue gas flow path and the air flow path. Axial, radial, and circumferential sealing structures are used to isolate the different media flow paths.

[0003] In existing technologies, the aforementioned shell structure typically adopts an integral or large-section construction, meaning the shell is integrally surrounded by the heat exchange component and connected to the corresponding flue gas ducts and air ducts. While this structure can achieve the enclosure of the heat exchange component and the limitation of the flow channels, it still has the following shortcomings in practical applications: Firstly, unibody shells are typically large in size, presenting challenges in molding and precision control during manufacturing. Furthermore, they present difficulties in transportation, hoisting, and on-site assembly, leading to inconvenience and installation challenges. When the shell experiences localized wear, corrosion, or damage, the unibody structure also makes disassembly, replacement, and maintenance inconvenient and results in higher repair costs.

[0004] Secondly, boiler air preheating equipment operates under conditions of continuous heat exchange between high-temperature flue gas and air, making the outer shell and related structures prone to thermal deformation. Existing integral shells, after thermal deformation, are susceptible to changes in the fitting clearances of various sealing parts, leading to a decrease in the sealing effectiveness of axial, radial, or circumferential seals. This increases the air leakage rate between the flue gas and air sides, hindering the improvement of heat exchange efficiency and the maintenance of operational stability. Summary of the Invention

[0005] To address the aforementioned problems, this application provides a boiler air preheating device and its installation process.

[0006] The boiler air preheating device provided in this application adopts the following technical solution: A boiler air preheating device includes a mounting base, a fixed shaft connected to the mounting base, a rotating sleeve sleeved on the fixed shaft, the rotating sleeve being rotatably connected to the mounting base, and a plurality of mounting frames provided on the fixed sleeve, each mounting frame being provided with a heat exchange component. It also includes several mounting plates, each of which is provided with a plug rod. The mounting frame has several first insertion holes along its circumference, and the first plug rod can be inserted into the first insertion hole. The adjacent mounting plates are connected by a connecting assembly, and the adjacent mounting plates are sealed by an axial sealing assembly. The mounting plates are driven to rotate around the fixed axis by a driving assembly, and several mounting plates, together with the axial sealing assembly, form the outer cover of the heat exchange assembly. A crossbeam is connected to the top of the fixed shaft, and a radial sealing assembly is provided between the crossbeam and the mounting bracket located at the top of the rotating sleeve. It also includes a connecting housing that is connected to the top and bottom of all the mounting plates via a circumferential sealing assembly, the connecting housing being used for connection to flue gas ducts and air ducts.

[0007] By adopting the above technical solution, the outer casing surrounding the heat exchange component is formed by assembling several mounting plates in sections, replacing the existing integral shell structure. This eliminates the need for a single-piece molding of the outer casing, allowing the originally large shell to be disassembled into multiple independent components for separate processing and transportation. This reduces manufacturing difficulty, facilitates control of processing precision, and improves the convenience of on-site hoisting, assembly, and replacement. When some mounting plates become worn, corroded, or damaged, they can be partially disassembled and replaced without replacing the entire shell, which helps reduce maintenance costs and improves maintenance efficiency.

[0008] Since each mounting plate is connected to the first insertion hole on the mounting frame through a plug rod, each mounting plate can be assembled segment by segment around the outer periphery of the mounting frame around the fixed axis. This not only ensures the installation positioning but also improves the ease of assembly and enables the segmented outer cover to form a stable circumferential support structure.

[0009] Compared to a monolithic shell structure, the segmented enclosure formed by several mounting plates reduces the overall rigidity constraint of the enclosure under hot conditions. This prevents deformation caused by localized heating from accumulating and propagating along the entire enclosure, thus mitigating the adverse effects of hot deformation on the sealing fit. Combined with the axial, radial, and circumferential sealing components, this design better adapts to positional and clearance changes caused by thermal expansion and contraction during equipment operation, reducing fluctuations in sealing clearances. This, in turn, helps control air leakage between the flue gas and air sides, improving heat exchange efficiency and operational stability.

[0010] Optionally, the mounting bracket includes a supporting annular plate and several partitions. The supporting annular plate is coaxially fixed with the rotating sleeve. The first insertion hole is opened on the outer peripheral surface of the supporting annular plate. Several partitions are vertically fixed to the supporting annular plate and are equidistantly arranged along the peripheral surface of the supporting annular plate. Each partition of the supporting annular plate supports the supporting annular plate above it. The heat exchange assembly includes several element boxes, each element is located between two adjacent partitions, and each element box is fitted to the side of the partition. Each element box is provided with several corrugated plates arranged at equal intervals, and ventilation gaps are left between adjacent corrugated plates.

[0011] By adopting the above technical solution, each component box is positioned between two adjacent partitions and is fitted against the side of the partitions. This allows each component box to be limited and supported by the partitions, preventing it from shifting during rotation or when subjected to airflow impact. Furthermore, separating the component boxes into different circumferential areas facilitates zoned installation, disassembly, and replacement, improving maintenance convenience.

[0012] Optionally, along the vertical distribution direction of the supporting annular plate, the ventilation spacing between adjacent corrugated plates in each component box gradually decreases from top to bottom.

[0013] By adopting the above technical solution, since the upper area of ​​the air preheating equipment is where hot flue gas enters and hot air is discharged during actual operation, and the lower area is where cold air enters and flue gas is discharged after heat exchange, the upper area is usually under higher temperature conditions and the lower area is usually under lower temperature conditions.

[0014] In the upper high-temperature zone, setting a larger ventilation gap between adjacent corrugated plates helps to improve the passage capacity of hot flue gas, reduce flue gas flow resistance, and reduce the possibility of dust carried by high-temperature flue gas accumulating, bridging, and blocking between the corrugated plates. This helps to improve the dust-proofing ability of the upper zone and ensures smooth flow of hot flue gas.

[0015] In the lower low-temperature zone, setting the ventilation spacing between adjacent corrugated plates to be smaller is beneficial for arranging more corrugated plates in a unit space, increasing the heat exchange area, thereby enhancing the heat exchange effect between the cold air and the corrugated plates after entering, allowing the cold air to be preheated more fully, and improving the utilization efficiency of the waste heat of the flue gas after heat exchange.

[0016] Optionally, each component box has a second insertion hole on the side facing the mounting plate, a second insertion rod is provided on the mounting plate, the insertion hole is inserted into the second insertion hole, and the component box is fitted to the mounting plate.

[0017] By adopting the above technical solution, the component box can not only be installed between adjacent partitions, but also further positioned by insertion through the mounting plate, thus forming a mating installation relationship between the component box and the mounting plate. This helps improve the installation stability of the component box on the mounting rack.

[0018] The component box is fitted snugly to the mounting plate, allowing the mounting plate to support and limit the outward-facing side of the component box, thereby further restricting the component box's radial swaying, offset, or loosening. This ensures that the component box maintains a relatively stable installation state during equipment rotation and the impact of flue gas and airflow, improving the overall reliability of the heat exchange assembly structure.

[0019] Optionally, the axial sealing assembly includes a plurality of first sealing gaskets. One end of the mounting plate is provided with a first abutment plate, and the other end of the mounting plate is provided with a second abutment plate. The first abutment plate is flush with the inner sidewall of the mounting plate, and the second abutment plate is flush with the outer sidewall of the mounting plate. Each first abutment plate has a first sealing gasket on the side away from the heat exchange assembly and each second abutment plate has a first sealing gasket on the side facing the heat exchange assembly. The first abutment plate abuts against the end of the adjacent mounting plate, and the first abutment plate and the second abutment plate of the adjacent mounting plate are arranged opposite each other, and the first sealing gaskets on the opposing first abutment plates and second abutment plates abut against each other.

[0020] By adopting the above technical solution, the relative cooperation between the first abutting plate and the second abutting plate, combined with the first sealing gasket set in the relative position, forms a meandering Z-shaped sealing path between the adjacent mounting plates, thereby extending the leakage path of the medium, reducing the possibility of leakage of the medium along the axial gap, and improving the axial sealing effect; at the same time, the abutting cooperation between the first abutting plate and the second abutting plate also helps to improve the stability of the connection between the adjacent mounting plates.

[0021] Optionally, the connecting assembly includes a plurality of pull plates. The pull plate is provided at the end of the first abutment plate away from the second abutment plate. The pull plate is also provided at the end of each mounting plate away from the first abutment plate. The pull plates on the first abutment plate correspond one-to-one with the pull plates on the end face of the adjacent mounting plate. The corresponding pull plates are connected by pull bolts.

[0022] By adopting the above technical solution, the first abutting plate and the tie plates on the end faces of the adjacent mounting plates are connected one-to-one by tie bolts, which can tighten and fix the adjacent mounting plates along the axial direction, thereby improving the connection strength and assembly stability between the adjacent mounting plates. At the same time, under the action of the tie, it is also conducive to keeping the first abutting plate, the second abutting plate and the oppositely arranged first sealing gasket in a stable abutting state, thereby ensuring the sealing effect of the axial sealing structure.

[0023] Optionally, the radial sealing assembly includes a sealing strip, which is provided on the partition plate near the top of the rotating sleeve. A sliding groove is provided at the bottom of the crossbeam, and a plurality of springs are provided in the sliding groove. The plurality of springs are connected to a pressing plate. Guide surfaces are provided on both sides of the pressing plate. When the sealing strip is located below the pressing plate, the springs are in a compressed state.

[0024] By adopting the above technical solution, the sealing strip set on the partition can form a radial sealing fit with the bottom of the crossbeam to seal the radial gap between the rotating sleeve and the crossbeam, reducing gas leakage from the radial gap; at the same time, the pressing plate can apply a continuous pressing force to the sealing strip under the action of the spring, so that even after the sealing strip is worn, the pressing contact can still be maintained by spring compensation, improving the sealing reliability and service life of the radial sealing assembly.

[0025] Optionally, the circumferential sealing assembly includes a second sealing gasket. The top and bottom of the mounting plate are provided with arc-shaped blocks, and the arc-shaped blocks at the same height are spliced ​​together to form a ring structure. The connecting shell includes two semi-cylindrical shells. The top and bottom of the inner sidewalls of the semi-cylindrical shells are provided with semi-circular clips. The top and bottom surfaces of the arc-shaped blocks are provided with the second sealing gaskets. The semi-circular clips are clamped on the two second sealing gaskets corresponding to the arc-shaped blocks. Both ends of the crossbeam are abutted against the inner walls of the two semi-circular abutment plates.

[0026] By adopting the above technical solution, arc-shaped blocks are set at the top and bottom of the mounting plate, and the arc-shaped blocks at the same height are spliced ​​together to form a ring structure. This creates a continuous circumferential connection at the top and bottom of the mounting plate, facilitating corresponding assembly with the connecting shell. The connecting shell is formed by splicing two semi-cylindrical shells, eliminating the need for integral molding of the connecting shell, which helps reduce processing and assembly difficulties, and facilitates docking and installation with the outer cover formed by the mounting plate.

[0027] After the semi-circular clip is inserted into the arc-shaped block, the second sealing gasket can effectively seal the circumferential connection, reducing the possibility of leakage or cross-flow of flue gas or air at this connection point, which helps to improve the circumferential sealing effect and thus ensure the separation effect of flue gas flow path and air flow path inside the equipment.

[0028] Optionally, the drive assembly includes a plurality of arc-shaped racks, each of the mounting plates is provided with one of the arc-shaped racks, one end of each arc-shaped rack is flush with the end of the first abutment plate, and the other end of each arc-shaped rack is flush with the end of the mounting plate, and the plurality of arc-shaped racks are spliced ​​together end to end to form a rack; The drive assembly also includes a drive motor connected to a gear. The connecting housing has an opening, and the gear extends into the opening to mesh with the arc-shaped rack.

[0029] By adopting the above technical solution, each mounting plate is provided with an arc-shaped rack, and several arc-shaped racks are spliced ​​together to form a complete rack, so that the segmented mounting plates can not only jointly form the outer cover of the heat exchange component, but also jointly form a continuous transmission structure. Since the arc-shaped racks are respectively set on each mounting plate, when a mounting plate or the corresponding arc-shaped rack is worn or damaged, it can be partially disassembled and replaced by using the mounting plate, without having to replace the entire transmission gear ring.

[0030] The technical solution for the installation process of a boiler air preheating equipment provided in this application is as follows: An installation process for a boiler air preheating device includes the following steps: S1. Fix and level the mounting base, and install the fixing shaft on the mounting base; S2. Fit the rotating sleeve to the fixed shaft; S3. Install the heat exchange components onto the mounting bracket; S4. Install the crossbeam; S5. Assemble the mounting plate and put on the connecting shell, then install the drive components.

[0031] In summary, this application includes at least one of the following beneficial technical effects: 1. The outer casing surrounding the heat exchange components is assembled from several mounting plates in sections, replacing the existing monolithic shell structure. This eliminates the need for a single-piece molding process, allowing the originally large shell to be disassembled into multiple independent parts for separate processing and transportation. This reduces manufacturing difficulty, facilitates precision control during processing, and improves the convenience of on-site hoisting, assembly, and replacement. When some mounting plates become worn, corroded, or damaged, they can be partially disassembled and replaced without replacing the entire shell, thus reducing maintenance costs and improving repair efficiency. 2. Since each mounting plate is connected to the first insertion hole on the mounting frame through the insertion rod, each mounting plate can be assembled segment by segment around the fixed axis on the outer periphery of the mounting frame. While ensuring the installation positioning, it is conducive to improving the assembly convenience and enables the segmented outer cover to form a stable circumferential support structure. 3. Compared to a monolithic shell structure, the segmented enclosure formed by several mounting plates helps reduce the overall rigidity constraint of the enclosure under hot conditions. This prevents deformation caused by localized heating from accumulating and propagating along the entire enclosure, thus mitigating the adverse effects of hot deformation on the sealing fit. Combined with the axial, radial, and circumferential sealing components, it can better adapt to positional and clearance changes caused by thermal expansion and contraction during equipment operation, reducing fluctuations in the sealing clearance. This, in turn, helps control the air leakage rate between the flue gas side and the air side, improving heat exchange efficiency and operational stability. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application.

[0033] Figure 2 yes Figure 1 An enlarged schematic diagram of part A in the middle.

[0034] Figure 3 This is a schematic diagram illustrating the structure of the fixed shaft and the rotating sleeve in an embodiment of this application.

[0035] Figure 4 yes Figure 3 Enlarged diagram of part B.

[0036] Figure 5 This is a schematic diagram illustrating the structure of the partition in an embodiment of this application.

[0037] Figure 6 This is a schematic diagram illustrating the structure of the clamping plate in an embodiment of this application.

[0038] Figure 7 This is a schematic diagram illustrating the structure of the semi-cylindrical shell in an embodiment of this application.

[0039] Figure 8 yes Figure 7 An enlarged schematic diagram of section C.

[0040] Figure 9 yes Figure 7 An enlarged schematic diagram of part D in the middle.

[0041] Explanation of reference numerals in the attached drawings: 1. Mounting base; 12. Fixed shaft; 13. Rotating sleeve; 14. Crossbeam; 141. Sliding groove; 15. Connecting outer shell; 151. Semi-cylindrical shell; 1511. Opening; 2. Mounting bracket; 21. Supporting annular plate; 211. First insertion hole; 212. Second insertion hole; 22. Partition plate; 3. Heat exchange assembly; 31. Component box; 4. Mounting plate; 41. First insertion rod; 42. Second insertion rod; 5. Circumferential sealing assembly Components; 51. Arc-shaped block; 52. Second sealing gasket; 53. Semi-circular clamping piece; 6. Axial sealing assembly; 61. First sealing gasket; 62. First abutment plate; 63. Second abutment plate; 7. Radial sealing assembly; 71. Sealing strip; 72. Spring; 73. Pressing plate; 731. Guide surface; 8. Connecting assembly; 81. Pull plate; 82. Pull bolt; 9. Drive assembly; 91. Arc-shaped rack; 92. Drive motor; 93. Gear. Detailed Implementation

[0042] The following is in conjunction with the appendix Figure 1-9 This application will be described in further detail.

[0043] This application discloses a boiler air preheating device.

[0044] like Figure 1-3 The boiler air preheating equipment includes a mounting base 1, which is fixed to an expansion support on a base frame mounted on the ground. A fixed shaft 12 is vertically fixed on the mounting base 1, and a rotating sleeve 13 is fitted onto the fixed shaft 12. Three layers of mounting frames 2 are arranged on the circumference of the rotating sleeve 13, and each layer of mounting frame 2 is equipped with a heat exchange component 3. The top of the fixed shaft 12 extends out of the rotating sleeve 13 and is fixed with a crossbeam 14. Several mounting plates 4 are installed on the circumference of all the mounting frames 2, and adjacent mounting plates 4 are connected by connecting components 8.

[0045] like Figure 1 , 4 An axial sealing assembly 6 is provided between the mounting plates 4 adjacent to 5. All the mounting plates 4 and the axial sealing assembly 6 cooperate to surround all the heat exchange components 3, thus forming the outer cover of the heat exchange components 3. The outer cover formed by all the mounting plates 4 and the axial sealing assembly 6 is rotatably connected to the connecting housing 15 through the circumferential sealing assembly 5. The mounting bracket 2 closest to the crossbeam 14 forms a seal with the bottom surface of the crossbeam 14 through the radial sealing assembly 7. The two ends of the crossbeam 14 are sealed and abut against the inner wall of the connecting housing 15. The connecting housing 15 is used to connect to the flue gas duct and the air duct. The radial sealing assembly 7 isolates the air side and the flue gas side, and the axial sealing assembly 6 and the circumferential sealing assembly 5 prevent gas leakage.

[0046] Specifically, the mounting frame 2 includes a supporting annular plate 21 and several partitions 22. The supporting annular plate 21 is fixed to the rotating sleeve 13, and the several partitions 22 are fixed to the top surface of the supporting annular plate 21 and are equidistantly arranged around the fixed shaft 12. Furthermore, the partitions 22 located on the next layer of supporting annular plate 21 support the bottom surface of the next layer of supporting annular plate 21.

[0047] The heat exchange assembly 3 includes several element boxes 31. Specifically, one element box 31 is disposed between two adjacent partitions 22. The element box 31 has a fan-shaped structure, with its top surface flush with the top surface of the partition 22. One end of the element box 31 is attached to the circumference of the rotating sleeve 13, and both sides of the element box 31 are attached to the adjacent partitions 22. Several corrugated plates (not shown in the figure, a conventional structure) are arranged inside the element box 31. The corrugated plates are arranged equidistantly around the rotating sleeve 13, with ventilation gaps between adjacent corrugated plates. Along the vertical distribution direction of the supporting annular plate 21, the ventilation gaps between adjacent corrugated plates in each element box 31 gradually decrease from top to bottom. That is, the ventilation gap of the corrugated plate closest to the crossbeam 14 is greater than the ventilation gap of the corrugated plate below it, and the ventilation gap of the corrugated plate closest to the mounting base 1 is smaller than the ventilation gap of the corrugated plate above it. This design improves the throughput of hot flue gas in the upper high-temperature region, reduces flue gas flow resistance, and decreases the possibility of dust carried by high-temperature flue gas accumulating, bridging, and blocking between the corrugated plates. In the lower low-temperature region, the heat exchange area is increased, thereby enhancing the heat exchange effect between the cold air and the corrugated plates after the cold air enters.

[0048] like Figure 4 and Figure 6 The radial sealing assembly 7 includes sealing strips 71. Sealing strips 71 are provided on all partitions 22 near the top of the rotating sleeve 13. A sliding groove 141 is provided at the bottom of the crossbeam 14, and several springs 72 are installed within the sliding groove 141. These springs 72 are connected to a pressing plate 73. Guide surfaces 731 are provided on both sides of the pressing plate 73. When the sealing strip 71 is below the pressing plate 73, the springs 72 are compressed. Furthermore, when one sealing strip 71 is disengaged from the pressing plate 73, another sealing strip 71 is in contact with the pressing plate 73. This reduces the leakage of flue gas to the air side and vice versa. Simultaneously, the pressing plate 73, under the action of the springs 72, can apply a continuous pressing force to the sealing strips 71. Even after the sealing strips 71 wear, the springs 72 can compensate and maintain the pressing contact, improving the sealing reliability and service life of the radial sealing assembly 7.

[0049] like Figure 3The mounting plate 4 is provided with a first insertion rod 41 and a second insertion rod 42 on the side facing the rotating sleeve 13. The circumference of the supporting ring plate 21 is provided with a plurality of first insertion holes 211 at equal intervals around the central axis. Each component box 31 is provided with a second insertion hole 212 at the end away from the rotating sleeve 13. The first insertion holes 211 correspond one-to-one with each other, and the second insertion rods 42 correspond one-to-one with each other. The mounting plate 4 is positioned by the first insertion rods 41 and the second insertion rods 42, so that the inner wall of the mounting plate 4 is fitted with the component box 31 and the supporting ring plate 21.

[0050] like Figure 2 The axial sealing assembly 6 includes a plurality of first sealing gaskets 61. One end of the mounting plate 4 is provided with a first abutment plate 62, and the other end of the mounting plate 4 is provided with a second abutment plate 63. The first abutment plate 62 is flush with the inner sidewall of the mounting plate 4, and the second abutment plate 63 is flush with the outer sidewall of the mounting plate 4. That is, both the first abutment plate 62 and the second abutment plate 63 are arc-shaped plates. In this embodiment, the first abutment plate 62 and the second abutment plate 63 are integrally formed with the mounting plate 4. Each first abutment plate 62 is provided with a first sealing gasket 61 on the side away from the heat exchange assembly 3 and each second abutment plate 63 is provided with a side facing the heat exchange assembly 3. The first abutment plate 62 abuts with the end of the adjacent mounting plate 4, and the second abutment plate 63 also abuts with the end of its adjacent mounting plate 4. The first abutment plate 62 and the second abutment plate 63 of the adjacent mounting plate 4 are arranged opposite each other, and the first sealing gaskets 61 on the opposite first abutment plate 62 and the second abutment plate 63 abut against each other. A meandering Z-shaped sealing path is formed between adjacent mounting plates 4, thereby extending the leakage path of the medium, reducing the possibility of medium leakage along the axial gap, and improving the axial sealing effect.

[0051] like Figure 8 Adjacent mounting plates 4 are connected by a connecting assembly 8, which includes several tie plates 81. A tie plate 81 is provided at the end of the first abutment plate 62 away from the second abutment plate 63, and a tie plate 81 is also provided at the end of each mounting plate 4 away from the first abutment plate 62. In this embodiment, each first abutment plate 62 and each mounting plate 4 has two tie plates 81. The tie plates 81 on the first abutment plate 62 correspond one-to-one with the tie plates 81 on the end face of the adjacent mounting plate 4, and the corresponding tie plates 81 are connected by tie bolts 82. The one-to-one connection between the first abutment plate 62 and the tie plates 81 on the end face of the adjacent mounting plate 4 via tie bolts 82 can axially tighten and fix the adjacent mounting plates 4, improving the connection strength and assembly stability between the adjacent mounting plates 4.

[0052] like Figure 9Each mounting plate 4 has an integrally formed arc-shaped block 51 at its top and bottom. One end of the arc-shaped block 51 is flush with the end face of the mounting plate 4, and the other end of the arc-shaped block 51 is flush with the end face of the first abutment plate 62. The circumferential sealing assembly 5 includes a number of second sealing gaskets 52. The top and bottom surfaces of the arc-shaped block 51 are provided with second sealing gaskets 52. All the second sealing gaskets 52 on the top surface of the arc-shaped block 51 are spliced ​​together to form a sealing ring, and all the second sealing gaskets 52 on the bottom surface of the arc-shaped block 51 are spliced ​​together to form a sealing ring.

[0053] like Figure 7 and Figure 9 The connecting housing 15 includes two semi-cylindrical housings 151. The top and bottom of the inner sidewall of the semi-cylindrical housing 151 are provided with semi-circular clips 53. The semi-circular clips 53 are flush with the ends of the semi-cylindrical housing 151. The semi-circular clips 53 are clamped on the two second sealing gaskets 52 of the corresponding arc-shaped block 51. That is, the semi-circular clips 53 located at the top of the semi-cylindrical housing 151 are inserted into the two second sealing gaskets 52 located at the top of the mounting plate 4, and the semi-circular clips 53 located at the bottom of the semi-cylindrical housing 151 are inserted into the two second sealing gaskets 52 located at the bottom of the mounting plate 4. Both ends of the crossbeam 14 are abutted against the inner walls of the two semi-circular abutment plates.

[0054] like Figure 1 and Figure 8 Several mounting plates 4 are driven to rotate around a fixed shaft 12 by a drive assembly 9. The drive assembly 9 includes an arc-shaped rack 91. Each mounting plate 4 is provided with an arc-shaped rack 91. One end of each arc-shaped rack 91 is flush with the end of the first abutment plate 62, and the other end of each arc-shaped rack 91 is flush with the end of the mounting plate 4. Several arc-shaped racks 91 are spliced ​​together end to end to form a rack. The drive assembly 9 also includes a drive motor 92. The drive motor 92 is connected to a gear 93. An opening 1511 is opened on one of the semi-cylindrical housings 151. The gear 93 extends into the opening 1511 and meshes with the arc-shaped rack 91.

[0055] This application embodiment also provides a boiler air preheating equipment installation process for installing the above-mentioned boiler air preheating equipment, including the following steps: S1. Fix and level the mounting base 1, and install the fixing shaft 12 on the mounting base 1; Install the base frame on the ground, install the expansion bracket on the base frame, fix the mounting base 1 on the expansion bracket, then level the mounting base 1, use a crane to lift the fixed shaft 12 onto the mounting base 1, tighten the bolts to fix it, and calibrate its verticality.

[0056] S2. Fit the rotating sleeve 13 to the fixed shaft 12; The crane lifting and moving sleeve 13 is set on the fixed shaft 12.

[0057] S3. Install heat exchange component 3 to mounting bracket 2; The component boxes 31 are laid out sequentially from bottom to top on the bottom mounting rack 2.

[0058] S4. Install crossbeam 14; Hoist the crossbeam 14 to the top of the fixed shaft 12, tighten the bolts, and ensure its levelness.

[0059] S5. Assemble the mounting plate 4 and put on the connecting shell 15, then install the drive assembly 9; Use a crane to lift and transport the mounting plate 4, and install the mounting plate 4 one by one. After all the mounting plates 4 are installed, tighten them with tie bolts 82, and then use a forklift to transfer the semi-cylindrical shell and the semi-circular clamp 53 onto the corresponding arc plate.

[0060] The implementation principle of this application embodiment is as follows: one side of the crossbeam 14 is the air side, and the other side is the flue gas side. The semi-circular shell is fixed to the corresponding pipe. The drive motor 92 controls the rotation of the mounting plate 4. The mounting plate 4 drives the supporting annular plate 21 and the component box 31 to rotate, so that the corrugated plate absorbs heat on the flue gas side and then rotates to the air side to exchange heat with the air. The outer cover surrounding the heat exchange component 3 is formed by assembling several mounting plates 4 in sections, replacing the existing integral shell structure. This eliminates the need for integral molding of the outer cover, allowing the originally large shell to be disassembled into multiple independent parts for separate processing and transportation, thereby reducing manufacturing difficulty and facilitating the control of processing accuracy. The method of forming the outer cover in sections by several mounting plates 4 helps to reduce the overall rigidity constraint of the outer cover under hot conditions, making it less likely for deformation caused by local heating to accumulate and be transmitted along the entire outer cover, thereby helping to mitigate the adverse effects of hot deformation on the sealing fit. With the axial sealing assembly 6, radial sealing assembly 7 and circumferential sealing assembly 5 in combination, the equipment can better adapt to position and gap changes caused by thermal expansion and contraction during operation, reduce the fluctuation of the sealing gap, and thus help control the air leakage rate between the flue gas side and the air side, improve heat exchange efficiency and operational stability.

[0061] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A boiler air preheating device, characterized in that: Includes a mounting base (1), the mounting base (1) is connected to a fixed shaft (12), a rotating sleeve (13) is sleeved on the fixed shaft (12), the rotating sleeve (13) is rotatably connected to the mounting base (1), and several layers of mounting frames (2) are provided on the rotating sleeve (13), and a heat exchange component (3) is provided on each layer of the mounting frame (2); It also includes several mounting plates (4), each mounting plate (4) is provided with a first insert rod (41), and the mounting bracket (2) is provided with several first insertion holes (211) along its circumference, and the first insert rod (41) can be inserted into the first insertion hole (211); The adjacent mounting plates (4) are connected by a connecting assembly (8), and the adjacent mounting plates (4) are sealed by an axial sealing assembly (6). The mounting plates (4) are driven to rotate around the fixed shaft (12) by a driving assembly (9). Several mounting plates (4) together with the axial sealing assembly (6) form the outer cover of the heat exchange assembly (3). A crossbeam (14) is connected to the top of the fixed shaft (12), and a radial sealing assembly (7) is provided between the crossbeam (14) and the mounting bracket (2) located on the top of the rotating sleeve (13); It also includes a connecting housing (15) which is rotatably connected to the top and bottom of all the mounting plates (4) via a circumferential sealing assembly (5) and is used to connect to flue gas ducts and air ducts.

2. The boiler air preheating equipment according to claim 1, characterized in that: The mounting bracket (2) includes a supporting ring plate (21) and a plurality of partitions (22). The supporting ring plate (21) is coaxially fixed with the rotating sleeve (13). The first insertion hole (211) is opened on the outer circumferential surface of the supporting ring plate (21). The plurality of partitions (22) are vertically fixed to the supporting ring plate (21) and are equidistantly arranged along the circumferential surface of the supporting ring plate (21). Each partition (22) of the supporting ring plate (21) supports the supporting ring plate (21) above it. The heat exchange assembly (3) includes several element boxes (31), each element box (31) is located between two adjacent partitions (22), and each element box (31) is attached to the side of the partition (22). Each element box (31) is provided with several corrugated plates arranged at equal intervals, and ventilation gaps are left between adjacent corrugated plates.

3. The boiler air preheating equipment according to claim 2, characterized in that: Along the vertical distribution direction of the supporting annular plate (21), the ventilation distance between adjacent corrugated plates in each component box (31) gradually decreases from top to bottom.

4. The boiler air preheating equipment according to claim 2, characterized in that: Each component box (31) has a second insertion hole (212) on the side facing the mounting plate (4). The mounting plate (4) is provided with a second insertion rod (42), which is inserted into the second insertion hole (212). The component box (31) is fitted to the mounting plate (4).

5. The boiler air preheating equipment according to claim 1, characterized in that: The axial sealing assembly (6) includes a plurality of first sealing gaskets (61). One end of the mounting plate (4) is provided with a first abutting plate (62), and the other end of the mounting plate (4) is provided with a second abutting plate (63). The first abutting plate (62) is flush with the inner sidewall of the mounting plate (4), and the second abutting plate (63) is flush with the outer sidewall of the mounting plate (4). Each first abutting plate (62) is provided with a first sealing gasket (61) on the side away from the heat exchange assembly (3) and each second abutting plate (63) is provided with a side facing the heat exchange assembly (3). The first abutting plate (62) abuts against the end of the adjacent mounting plate (4), and the first abutting plate (62) and the second abutting plate (63) of the adjacent mounting plate (4) are arranged opposite to each other. At the same time, the first sealing gaskets (61) on the opposing first abutting plate (62) and the second abutting plate (63) abut against each other.

6. The boiler air preheating equipment according to claim 5, characterized in that: The connecting assembly (8) includes several pull plates (81). The pull plate (81) is provided at the end of the first abutment plate (62) away from the second abutment plate (63). The pull plate (81) is also provided at the end of the mounting plate (4) away from the first abutment plate (62). The pull plates (81) on the first abutment plate (62) correspond one-to-one with the pull plates (81) on the end face of the adjacent mounting plate (4). The corresponding pull plates (81) are connected by pull bolts (82).

7. The boiler air preheating equipment according to claim 2, characterized in that: The radial sealing assembly (7) includes a sealing strip (71). The sealing strip (71) is provided on the partition plate (22) near the top of the rotating sleeve (13). A sliding groove (141) is provided at the bottom of the crossbeam (14). A plurality of springs (72) are provided in the sliding groove (141). The plurality of springs (72) are connected to a pressing plate (73). Guide surfaces (731) are provided on both sides of the pressing plate (73). When the sealing strip (71) is located below the pressing plate (73), the springs (72) are in a compressed state.

8. The boiler air preheating equipment according to claim 1, characterized in that: The circumferential sealing assembly (5) includes a second sealing gasket (52). The top and bottom of the mounting plate (4) are provided with arc-shaped blocks (51). The arc-shaped blocks (51) at the same height are spliced ​​together to form a ring structure. The connecting shell (15) includes two semi-cylindrical shells (151). The top and bottom of the inner sidewall of the semi-cylindrical shell (151) are provided with semi-circular clips (53). The top and bottom surfaces of the arc-shaped blocks (51) are provided with the second sealing gaskets (52). The semi-circular clips (53) are clamped on the two second sealing gaskets (52) corresponding to the arc-shaped blocks (51). Both ends of the crossbeam (14) are abutted against the inner walls of the two semi-cylindrical shells (151).

9. The boiler air preheating equipment according to claim 5, characterized in that: The drive assembly (9) includes a plurality of arc-shaped racks (91), each of the mounting plates (4) is provided with an arc-shaped rack (91), one end of each arc-shaped rack (91) is flush with the end of the first abutment plate (62), and the other end of each arc-shaped rack (91) is flush with the end of the mounting plate (4), and the plurality of arc-shaped racks (91) are spliced ​​together end to end to form a rack; The drive assembly (9) also includes a drive motor (92), the drive motor (92) is connected to a gear (93), the connecting housing (15) has an opening (1511), the gear (93) extends into the opening (1511) and meshes with the arc-shaped rack (91).

10. An installation process for a boiler air preheating device, characterized in that: For installing any one of the boiler air preheating devices described in 1-9, the following steps are included: S1. Fix and level the mounting base (1), and install the fixing shaft (12) on the mounting base (1); S2. Fit the rotating sleeve (13) onto the fixed shaft (12); S3. Install the heat exchange component (3) onto the mounting bracket (2); S4. Install the crossbeam (14); S5. Assemble the mounting plate (4) and put on the connecting shell (15), then install the drive assembly (9).

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