Air preheater with fan seal convenient to maintain

Abstract

This utility model discloses an air preheater with a convenient maintenance fan-shaped sealing device. It belongs to the field of rotary air preheater design and manufacturing. The device includes a rotor, an outer shell assembly, and upper and lower connecting frames at its top and bottom ends, respectively. The upper connecting frame includes an upper beam and a circumferential outer shell. The circumferential outer shell has an opening and closing installation door corresponding to the outer end of the upper beam. Radial bosses are located on the two radial edges of the upper surface of the upper beam. A fan-shaped sealing plate is connected below the upper beam. Several connecting blocks are fixed to the outer sides of the two radial edges of the fan-shaped sealing plate. Each connecting block has a connecting hole into which an adjusting screw is connected. Adjusting nuts are screwed onto the adjusting screws on both the upper and lower sides of the connecting blocks. When the fan-shaped sealing plate is inserted into the bottom of the upper beam from the installation door, the upper end of the adjusting screw is welded to the bottom of the radial bosses on the upper beam. This structure solves the problems of large disassembly work and inconvenient maintenance of heavy-duty fan-shaped sealing devices.

Description

Technical Field

[0001] This utility model relates to the field of rotary air preheater design and manufacturing, specifically to an air preheater with a convenient maintenance fan-shaped sealing device. Background Technology

[0002] Rotary air preheaters are a major auxiliary device in thermal power plants, utilizing the waste heat of flue gas at the boiler's tail end to heat the air needed for boiler combustion. They rely on heat transfer elements to absorb heat from the higher-temperature flue gas, which then rotates through multiple compartments (24, 36, 48 compartments, etc.) into the air passage, transferring the heat to the cold air. The heat storage elements continuously alternately pass through the flue gas and air passages, thereby recovering heat energy and reducing fuel loss. The main heat exchange component is the heat storage element box, typically designed as a basket frame structure, with compartments labeled A, B, C, D, E... from the center outwards for easy maintenance and replacement.

[0003] The upper and lower beams of the rotary air preheater are equipped with sector-shaped sealing devices. The sector-shaped sealing devices mainly form the main sealing form of the air preheater through the sector-shaped plates and accessories and the radial sealing plates of the rotor. They are the core components for controlling air leakage in the air preheater. The number of sector-shaped sealing devices varies depending on the number of compartments.

[0004] Existing sector-shaped sealing devices, in their initial design considering redundancy and strength, often employ a heavy-duty sector-shaped structure. This structure uses a 16-25mm low-alloy corrosion-resistant and wear-resistant sector-shaped plate, with 12-16mm reinforcing ribs welded to the back, and is connected to the upper and lower beams using a threaded tie rod structure. In actual operation, the tie rod is adjusted according to the hot-state operating clearance between the sector-shaped surface and the radial seal. However, due to the limited space in the sector-shaped sealing area, during later maintenance, the rotor cannot be removed, and the sector-shaped surface is larger than the compartment partition. The heavy-duty sector-shaped device structure, due to the threaded tie rod, cannot be disassembled and replaced from the circumferential side. It often requires simultaneous disassembly of the upper and lower beams, resulting in a large maintenance workload and making practical construction difficult. Furthermore, since the sector-shaped bottom surface of the sector-shaped sealing device plays a major sealing role in conjunction with the radial seal, a high degree of flatness is required for the sector-shaped bottom surface. Therefore, stress-relieving heat treatment and milling machining are often performed after welding to ensure the sealing effect. Consequently, the production process of sector-shaped sealing devices is complex, with high lead times and costs.

[0005] In view of the problems existing in the prior art, this utility model designs and manufactures an air preheater that is easy to maintain for the sector-shaped sealing device, in order to overcome the above defects. Summary of the Invention

[0006] To address the problems existing in the prior art, this utility model provides an air preheater for easy maintenance of a sector-shaped sealing device. This effectively solves the problems of large disassembly workload and inconvenient maintenance of heavy-duty sector-shaped sealing devices, greatly reducing the amount of construction work and effectively reducing the manufacturing workload of sector-shaped sealing devices, thereby lowering production and construction costs.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is as follows: an air preheater for easy maintenance of a fan-shaped sealing device, including a rotor, an outer shell plate assembly, an upper connecting frame and a lower connecting frame respectively provided at the upper and lower ends of the rotor, and the upper connecting frame and the lower connecting frame connected to the outer shell plate assembly;

[0008] The upper connecting frame includes an upper beam and a circumferential outer shell. The upper beam divides the interior of the circumferential outer shell into a flue gas port and an air port. The circumferential outer shell is provided with an opening and closing installation door at the outer end position of the upper beam. The upper beam has radial protrusions at the two radial edges of its upper end face, and the two radial protrusions are arranged radially.

[0009] A fan-shaped sealing plate is connected below the upper beam. Several connecting blocks are fixed on the outer sides of the two radial sides of the fan-shaped sealing plate. The connecting blocks are arranged radially along the radial sides of the fan-shaped sealing plate. Each connecting block has a connecting hole, and an adjusting screw is connected to the connecting hole. Adjusting nuts are screwed onto the adjusting screws on both the upper and lower sides of the connecting block. When the fan-shaped sealing plate is inserted into the bottom of the upper beam from the installation door position, the upper end of the adjusting screw is welded to the bottom of the radial boss of the upper beam.

[0010] Preferably, two radial positioning plates are provided on both sides of the bottom of the upper beam. The two radial positioning plates are parallel to the two adjacent radial sides of the fan-shaped sealing plate, and the two radial positioning plates are arranged on both sides of the positioned fan-shaped sealing plate.

[0011] Preferably, after the position of the sector-shaped sealing plate is adjusted by the adjusting nut, the two radial sides of the sector-shaped sealing plate are welded to the two radial positioning plates respectively.

[0012] Preferably, the length of the adjusting screw is less than the distance between the bottom of the sector-shaped sealing plate and the bottom of the radial boss.

[0013] Preferably, the fan-shaped sealing plate has several steel plate reinforcing ribs welded to the side away from the rotor.

[0014] Preferably, the steel plate reinforcing ribs are channel steels, which are intermittently welded and connected to the fan-shaped sealing plate.

[0015] Preferably, the connecting block is a channel steel, and a reinforcing plate is welded to the bottom of the channel steel, and the connecting hole penetrates through the channel steel and the reinforcing plate.

[0016] Preferably, the sector-shaped sealing plate is provided with a hoisting connection hole.

[0017] Preferably, the upper beam is Y-shaped, and the Y-shaped upper beam divides the circumferential interior of the outer shell into a flue gas port, a primary air port, and a secondary air port;

[0018] The surrounding outer shell has three opening and closing mounting doors at the outer end of the Y-shaped upper beam.

[0019] The advantages of this utility model are:

[0020] 1. In actual on-site construction, the original adjusting screw in the center of the sector-shaped sealing plate will affect the disassembly and reinstallation of the sector-shaped sealing plate. Therefore, during maintenance, the original adjusting screw in the middle of the sector-shaped sealing plate should be cut off directly. After removing the sector-shaped sealing plate from the installation door, the sealing surface of the sector-shaped sealing plate should be repaired. Then, new adjusting screws should be installed on both radial edges of the sector-shaped sealing plate. Since the length of the adjusting screw is less than the distance between the bottom of the sector-shaped sealing plate and the bottom of the radial boss, and the operator can directly adjust the height of the sector-shaped sealing plate up and down through the flue gas port and air port and weld the upper end of the adjusting screw, the amount of construction work of removing the upper beam is reduced compared with the traditional disassembly and assembly method of sector-shaped sealing plate.

[0021] 2. This utility model maintains the original overall structure of the fan-shaped sealing plate, moves the original adjusting screw to both sides outward, and provides connecting holes on both sides of the fan-shaped sealing plate to cooperate with the adjusting screw, so that the operator can directly adjust the height of the fan-shaped sealing plate and weld it through the flue gas port and air port, thereby solving the problem of large disassembly work and inconvenient maintenance of the fan-shaped sealing device.

[0022] 3. This utility model adjusts the steel plate reinforcing ribs of the fan-shaped sealing plate to channel steel reinforcement. The channel steel is connected to the fan-shaped sealing plate by intermittent welding. Pre-welding anti-deformation control can effectively reduce welding deformation and ensure that the flatness of the sealing surface of the fan-shaped sealing plate meets the usage requirements. This method can eliminate the post-weld stress-relieving heat treatment and milling machining process, simplifying the production process and reducing the lead time and manufacturing cost. Attached Figure Description

[0023] Figure 1 A schematic diagram of an air preheater with a convenient sector-shaped sealing device;

[0024] Figure 2 This is a schematic diagram showing the distribution of the sector-shaped sealing plate of this utility model;

[0025] Figure 3 This is a cross-sectional view of the present invention at the CC section;

[0026] Figure 4 This is a cross-sectional view of the mating point between the sector-shaped sealing plate and the radial positioning plate at the CC position of this utility model;

[0027] Figure 5 This is a schematic diagram showing that the connecting block of this utility model is made of channel steel and reinforcing plate.

[0028] In the diagram: 1. Outer shell assembly; 2. Upper beam; 3. Circumferential outer shell; 4. Lower connecting frame; 5. Mounting door; 6. Fan-shaped sealing plate; 7. Connecting block; 8. Steel plate reinforcing rib; 9. Lifting connection hole; 10. Adjusting screw; 11. Adjusting nut; 12. Radial positioning plate; 13. Reinforcing plate; 14. Connecting hole. Detailed Implementation

[0029] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0030] like Figures 1 to 5 As shown, an air preheater for a convenient maintenance fan-shaped sealing device includes a rotor, an outer shell plate assembly 1 is provided on the outside of the rotor, and an upper end connecting frame and a lower end connecting frame 4 are respectively provided at the upper and lower ends of the rotor, and the upper end connecting frame and the lower end connecting frame 4 are connected to the outer shell plate assembly 1.

[0031] The upper connecting frame includes an upper beam 2 and a circumferential outer shell 3. The upper beam 2 divides the interior of the circumferential outer shell 3 into a flue gas port and an air port. The circumferential outer shell 3 is provided with an opening and closing installation door 5 at the outer end position of the upper beam 2. The upper beam 2 has radial bosses at the two radial edges of its upper surface, and the two radial bosses are arranged radially.

[0032] The present invention has a fan-shaped sealing plate 6 connected below the upper beam 2. Several connecting blocks 7 are fixed to the outer sides of the two radial edges of the fan-shaped sealing plate 6. The connecting blocks 7 are arranged radially along the radial edges of the fan-shaped sealing plate 6. Each connecting block 7 has a connecting hole 14, into which an adjusting screw 10 is connected. Adjusting nuts 11 are screwed onto the adjusting screws 10 on both the upper and lower sides of the connecting block 7. When the fan-shaped sealing plate 6 is inserted from the mounting door 5 to the bottom of the upper beam 2, the upper end of the adjusting screw 10 is welded to the bottom of the radial boss of the upper beam 2. Preferably, the connecting block 7 is a channel steel, with a reinforcing plate 13 welded to the bottom of the channel steel. The connecting hole 14 penetrates both the channel steel and the reinforcing plate 13.

[0033] The original sector-shaped sealing plate 6 uses an adjusting screw 10 on the upper end face of the sector-shaped sealing plate 6, and a through connection hole on the upper beam 2 to cooperate with the adjusting screw 10. A connecting nut is set above the through connection hole to connect with the adjusting screw 10, and the upper and lower installation positions of the original sector-shaped sealing plate 6 are adjusted by the connecting nut. However, since the sealing surface at the bottom of the sector-shaped sealing plate 6 is worn and needs maintenance, if the original sector-shaped sealing plate 6 is used for disassembly and installation, the upper beam 2 must also be removed, which will greatly increase the workload.

[0034] In actual on-site construction, the original adjusting screw 10 in the center of the sector-shaped sealing plate 6 affects the disassembly and reinstallation of the sector-shaped sealing plate 6. Therefore, during maintenance, the original adjusting screw 10 in the middle of the sector-shaped sealing plate 6 must be cut off directly. Then, the sector-shaped sealing plate 6 is removed from the installation door 5, the sealing surface of the sector-shaped sealing plate 6 is repaired, and new adjusting screws 10 are installed on both radial edges of the sector-shaped sealing plate 6. Since the length of the adjusting screw 10 is less than the distance between the bottom of the sector-shaped sealing plate 6 and the bottom of the radial boss, and the operator can directly reach into the bottom of the upper beam 2 through the flue gas port and air port to adjust the height of the sector-shaped sealing plate 6 and weld the upper end of the adjusting screw 10, the amount of construction work required to dismantle the upper beam 2 is reduced compared to the traditional disassembly and assembly method of the sector-shaped sealing plate 6.

[0035] Since the original overall structure of the sector-shaped sealing plate 6 remains unchanged, the original adjusting screw 10 is moved outward to both sides, and the connecting holes 14 on both sides of the sector-shaped sealing plate 6 are provided to cooperate with the adjusting screw 10, so that the operator can directly adjust the height of the sector-shaped sealing plate 6 and weld it through the flue gas port and air port. This solves the problem of large disassembly work and inconvenient maintenance of the sector-shaped sealing device.

[0036] The bottom sides of the upper beam 2 of this utility model are provided with two radial positioning plates 12. The two radial positioning plates 12 are parallel to the two adjacent radial sides of the fan-shaped sealing plate 6. The two radial positioning plates 12 are set on both sides of the positioned fan-shaped sealing plate 6. The installation position of the fan-shaped sealing plate 6 can be defined by this structure.

[0037] After the position of the sector-shaped sealing plate 6 is adjusted by the adjusting nut 11, the two radial sides of the sector-shaped sealing plate 6 are welded to the two radial positioning plates 12 respectively, thereby ensuring the positional stability of the sector-shaped sealing plate 6.

[0038] The length of the adjusting screw 10 of this utility model is less than the distance between the bottom of the fan-shaped sealing plate 6 and the bottom of the radial boss, so as to ensure that it can enter the bottom of the upper beam 2 through the installation door 5 along with the fan-shaped sealing plate 6.

[0039] The fan-shaped sealing plate 6 has several steel plate reinforcing ribs 8 welded to the side away from the rotor. The steel plate reinforcing ribs 8 of this utility model are made of channel steel, which are intermittently welded and connected to the fan-shaped sealing plate 6.

[0040] The sector-shaped sealing plate 6 of this utility model is provided with a hoisting connection hole 9, which facilitates the hoisting of the sector-shaped sealing plate 6.

[0041] The upper beam 2 is Y-shaped. The Y-shaped upper beam 2 divides the interior of the circumferential outer shell 3 into a flue gas inlet, a primary air inlet, and a secondary air inlet. The circumferential outer shell 3 is provided with three opening and closing installation doors 5 at the outer end of the Y-shaped upper beam 2.

[0042] Although this utility model does not describe the fan-shaped sealing plate 6 at the lower beam position, those skilled in the art can easily make appropriate adjustments based on the above structure, and can also disassemble and install it through the above structure, so it will not be described in detail here.

[0043] It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of protection of this utility model. Furthermore, it should be understood that after reading the technical description of this utility model, those skilled in the art can make various alterations, modifications, and / or variations to this utility model, and all such equivalent forms also fall within the scope of protection defined by the appended claims.

Claims

1. An air preheater with a convenient-to-maintain sector-shaped sealing device, characterized in that, Includes a rotor, the rotor is provided with an outer shell plate assembly (1), the upper end connecting frame and the lower end connecting frame (4) are respectively provided at the upper and lower ends of the rotor, and the upper end connecting frame and the lower end connecting frame (4) are connected to the outer shell plate assembly (1); The upper connecting frame includes an upper beam (2) and a circumferential outer shell (3). The upper beam (2) divides the interior of the circumferential outer shell (3) into a flue gas port and an air port. The circumferential outer shell (3) is provided with an opening and closing installation door (5) at the outer end of the upper beam (2). The upper beam (2) is provided with radial protrusions at the two radial edges of the upper end face. The two radial protrusions are arranged radially. A fan-shaped sealing plate (6) is connected below the upper beam (2). Several connecting blocks (7) are fixed on the outer sides of the two radial sides of the fan-shaped sealing plate (6). Several connecting blocks (7) are arranged radially along the radial sides of the fan-shaped sealing plate (6). A connecting hole (14) is provided on the connecting block (7). An adjusting screw (10) is connected in the connecting hole (14). An adjusting nut (11) is screwed on the adjusting screw (10) on both the upper and lower sides of the connecting block (7). When the fan-shaped sealing plate (6) is inserted into the bottom of the upper beam (2) from the position of the installation door (5), the upper end of the adjusting screw (10) is welded to the bottom of the radial boss of the upper beam (2).

2. The air preheater with a convenient-to-maintain sector-shaped sealing device according to claim 1, characterized in that, The upper beam (2) has two radial positioning plates (12) on both sides of its bottom. The two radial positioning plates (12) are parallel to the two adjacent radial sides of the fan-shaped sealing plate (6) respectively. The two radial positioning plates (12) are set on both sides of the positioned fan-shaped sealing plate (6).

3. The air preheater with a convenient-to-maintain sector-shaped sealing device according to claim 2, characterized in that, After adjusting the position of the sector-shaped sealing plate (6) by the adjusting nut (11), the two radial sides of the sector-shaped sealing plate (6) are welded to the two radial positioning plates (12) respectively.

4. An air preheater with a convenient-to-maintain sector-shaped sealing device according to claim 1, characterized in that, The length of the adjusting screw (10) is less than the distance between the bottom of the fan-shaped sealing plate (6) and the bottom of the radial boss.

5. An air preheater with a convenient-maintaining sector-shaped sealing device according to claim 1, characterized in that, The fan-shaped sealing plate (6) has several steel plate reinforcing ribs (8) welded to the side away from the rotor.

6. An air preheater with a convenient-to-maintain sector-shaped sealing device according to claim 5, characterized in that, The steel plate reinforcing rib (8) is a channel steel, which is intermittently welded and connected to the fan-shaped sealing plate (6).

7. An air preheater with a convenient-to-maintain sector-shaped sealing device according to claim 1, characterized in that, The connecting block (7) is a channel steel, and a reinforcing plate (13) is welded to the bottom of the channel steel. The connecting hole (14) passes through the channel steel and the reinforcing plate (13).

8. An air preheater with a convenient-to-maintain sector-shaped sealing device according to claim 1, characterized in that, The sector-shaped sealing plate (6) is provided with a hoisting connection hole (9).

9. An air preheater with a convenient-to-maintain sector-shaped sealing device according to claim 1, characterized in that, The upper beam (2) is Y-shaped, and the Y-shaped upper beam (2) divides the interior of the circumferential outer shell (3) into a flue gas port, a primary air port and a secondary air port; The surrounding outer shell (3) has three opening and closing mounting doors (5) at the outer end of the Y-shaped upper beam (2).

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