A sealing structure of a rotary air preheater of a boiler

Abstract

The utility model relates to rotary air preheater technical field especially relates to a kind of sealing structure of boiler rotary air preheater, it is set in the radial baffle of rotor, the sealing structure is by multiple sealing units and sequentially segmented setting on radial baffle, the sealing unit includes: sealing base;Sealing sheet, corresponding rotation setting in the inside of the sealing base, both ends of each the sealing sheet are respectively provided with combination groove and combination block;Double-channel anti-clearance resistance flow sheet, including main resistance flow sheet, auxiliary resistance flow sheet.The utility model can be segmented through the support and elastic member of itself independently up and down movement, always keep with the best micro-gap of rotor local area, and will not be influenced by the deformation of other parts of rotor, and under the adaptive connection of combination groove and combination block, solve the leakage problem existing between segmentation;Also through the double-channel anti-clearance resistance flow sheet of setting, form turbulence to carry out energy dissipation, to realize effective sealing.

Description

Technical Field

[0001] This utility model relates to the field of rotary air preheater technology, and in particular to a sealing structure for a boiler rotary air preheater. Background Technology

[0002] The statements herein provide only background information in relation to this invention and do not necessarily constitute prior art.

[0003] Rotary air preheaters are key heat exchange equipment in large power plant boilers, with their rotors rotating continuously and slowly during operation. Due to issues such as rotor mass, uneven temperature distribution, and thermal deformation, their shape during hot operation (typically a "mushroom-like" deformation) differs significantly from their ideal cylindrical shape when stationary in a cold state. This dynamic deformation makes it difficult to control the gap between the traditional integral sealing plate fixed to the rotor and the fan-shaped plate fixed to the shell.

[0004] Traditional radial seals are typically elongated, monolithic structures, rigidly or flexibly fixed to the radial diaphragms of the rotor by supports. This structure cannot accommodate the complex and uneven thermal deformation of the rotor during operation. As a result, the seal can only be pre-set with a fixed gap based on the deformation of a certain part of the rotor (usually the center or edge), while in other areas of the rotor, the gap either becomes too large, leading to a surge in leakage, or becomes too small, causing frictional wear. Utility Model Content

[0005] The purpose of this utility model is to address the aforementioned shortcomings by providing a sealing structure for a boiler rotary air preheater.

[0006] To solve the above technical problems, this utility model adopts the following technical solution: a sealing structure for a boiler rotary air preheater, which is arranged on a radial partition plate of the rotor. The radial partition plate is used to divide the rotor into multiple sector-shaped compartments within the shell. The upper and lower ends of the rotor are provided with sector-shaped plates fixed to the shell and dividing the rotor's flow portion into a flue gas side and an air side. The sealing structure is used to prevent air from leaking into the flue gas through the gap between the upper and lower ends of the rotor and the sector-shaped plates. The sealing structure is composed of multiple sealing units arranged sequentially in segments on the radial partition plate. Each sealing unit includes: A sealing base, wherein the sealing base is disposed on one side of the radial partition; The sealing sheet is rotatably disposed on the inner side of the sealing base. Each sealing sheet has a combination groove and a combination block at both ends. The combination groove on one sealing sheet is adapted to be inserted into the combination block on the sealing sheet at the adjacent position, so that the multiple sealing units installed in sections on the radial partition are sequentially spliced. Multiple elastic elements are evenly arranged on the inner side of the sealing sheet, and the elastic elements elastically support the sealing sheet to compensate for thermal deformation and mechanical deviation. The dual-channel gap-removing flow-blocking plate includes a main flow-blocking plate disposed on the back of the sealing plate and a secondary flow-blocking plate superimposed on the main flow-blocking plate, which are used to alternately form interception gaps and expansion cavities.

[0007] Furthermore, the main flow-blocking plate has multiple evenly distributed sealing strips alternately arranged on the end face of the corresponding sealing plate, with a small chamber left between each pair of sealing strips. Similarly, the secondary flow-blocking plate has multiple alternating and evenly distributed sealing strips on the end face of the corresponding main flow-blocking plate.

[0008] Furthermore, the sealing sheet and the main flow-blocking sheet each have two slots symmetrically distributed along their length, and the main flow-blocking sheet and the secondary flow-blocking sheet are provided with matching blocks corresponding to the slots; The slot on the sealing sheet and the block on the main flow-blocking sheet are adapted to each other, so that the main flow-blocking sheet can be detachably disposed on the back of the sealing sheet; The slot on the main flow-blocking plate and the block on the secondary flow-blocking plate are adapted to each other, so that the secondary flow-blocking plate can be detachably mounted on the main flow-blocking plate.

[0009] Furthermore, the main flow-blocking plate forms a gradually narrowing gap of 15-20° on the sealing plate, and the secondary flow-blocking plate forms a reverse gradually expanding gap of 10-15° on the main flow-blocking plate.

[0010] Furthermore, the elastic element includes a support frame vertically disposed on the sealing base, a connecting rod parallel to the sealing base and passing through the support frame, a hinge seat rotatably disposed on the end of the connecting rod corresponding to the sealing sheet, the hinge seat being disposed on the sealing sheet, a spring being sleeved on the portion of the connecting rod located between the support frame and the hinge seat, and a locking nut being rotatably disposed on the lower portion of the connecting rod located on the support frame.

[0011] Furthermore, the combined groove is provided with an outwardly expanding opening at the outer end of the sealing sheet, and the combined block is provided with an outwardly expanding end corresponding to the outwardly expanding opening.

[0012] Furthermore, the sealing sheet is integrally formed with a bevel, which is used to abut against the end face of the fan-shaped plate fixed on the housing.

[0013] Furthermore, the sealing sheet is made of heat-resistant high-strength steel metal sealing strip.

[0014] The beneficial effects of this utility model are reflected in: This invention, due to the multiple sealing units segmented and combined on the radial partition, can move independently up and down segment by segment through their own support and elastic elements, always maintaining the optimal micro-gap with the local area of ​​the rotor, without being affected by the deformation of other parts of the rotor. Furthermore, with the adaptive connection of the combined groove and the combined block, the leakage problem between segments is solved. In addition, the double-channel gap-eliminating flow-blocking plate is set to form turbulence, which is converted into internal energy through internal friction, collision and mixing, and guides the air to dissipate energy, thereby achieving effective sealing and further improving the flow-blocking effect of the seal. Attached Figure Description

[0015] Figure 1 This is a perspective view of the overall application of this utility model on a radial partition according to an embodiment of the present invention; Figure 2 This is a side view of the planar structure of the sealing unit according to an embodiment of the present invention; Figure 3 This is a three-dimensional structural diagram of the double-channel gap-eliminating flow-blocking plate assembled on the sealing unit according to an embodiment of the present invention, taken from a separate perspective. Figure 4 This is a three-dimensional structural view of the double-channel gap-eliminating flow-blocking plate assembled on the sealing unit according to an embodiment of the present invention, from another separate perspective. Figure 5 This is an enlarged structural diagram of the connection of the double-channel gap-eliminating flow-blocking plate on the sealing plate in one embodiment of the present invention.

[0016] In the picture: 1. Sealing base; 2. Sealing plate; 21. Combination groove; 22. Combination block; 3. Elastic element; 31. Support frame; 32. Connecting rod; 33. Spring; 4. Main flow deflector; 5. Secondary flow deflector; 6. Sealing strip; 7. Slot; 8. Block. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present utility model, and not all of them. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model.

[0018] Please see Figure 1-5This utility model discloses a sealing structure for a rotary air preheater in a boiler, which is arranged on a radial partition plate of the rotor. The radial partition plate is used to divide the rotor into multiple sector-shaped compartments within the housing. The upper and lower ends of the rotor are provided with sector-shaped plates fixed to the housing and dividing the rotor's flow portion into a flue gas side and an air side. The sealing structure is used to prevent air from leaking into the flue gas through the gaps between the upper and lower ends of the rotor and the sector-shaped plates. The sealing structure consists of multiple sealing units arranged sequentially in segments on the radial partition plate. Each sealing unit includes: A sealing base 1 is disposed on one side of the radial partition; The sealing sheet 2 is rotatably disposed on the inner side of the sealing base 1. Each sealing sheet 2 has a combination groove 21 and a combination block 22 at both ends. The combination groove 21 on one sealing sheet 2 is adapted to be inserted into the combination block 22 on the adjacent sealing sheet 2, so that the multiple sealing units installed in sections on the radial partition are sequentially spliced. Multiple elastic elements 3 are evenly arranged on the inner side of the sealing sheet 2. The elastic elements 3 elastically support the sealing sheet 2 to compensate for thermal deformation and mechanical deviation. The dual-channel gap-removing flow-blocking plate includes a main flow-blocking plate 4 disposed on the back of the sealing plate 2 and a secondary flow-blocking plate 5 superimposed on the main flow-blocking plate 4, which are used to alternately form interception gaps and expansion cavities.

[0019] In practice, the segmented structure design, consisting of multiple sealing units spliced ​​along the length of one side of the radial partition, can move up and down independently through its own support and elastic element 3, always maintaining the optimal micro-gap with the local area of ​​the rotor, without being affected by the deformation of other parts of the rotor. The combination groove 21 and combination block 22 are adapted and connected between the two combined sealing pieces 2. The width of the combination groove 21 can be adapted to the inner groove of the combination groove 21, and the combination block 22 on the adjacent sealing pieces 2 can be inserted to make effective connection between the two segmented sealing units, effectively solving the leakage problem between the segments. Furthermore, by setting a double-channel gap-reducing flow-blocking plate on the back of the sealing plate 2, turbulence can be formed on the back of the sealing plate 2. Through internal friction, collision and mixing, it is converted into internal energy, which guides the air to dissipate energy, thereby achieving effective sealing and further improving the flow-blocking effect of the seal.

[0020] It should be noted that the bolt mounting holes a on the radial partition and b on the sealing base 1 are used to insert bolts into bolt mounting holes b and protrude from bolt mounting holes a, and to fix the sealing base 1 to one side of the radial partition with nuts.

[0021] In one embodiment, the main flow-blocking plate 4 has multiple evenly distributed sealing strips 6 alternately arranged on the end face corresponding to the sealing plate 2, with small chambers left between each pair of sealing strips 6. Similarly, the secondary flow-blocking plate 5 has multiple alternating and evenly distributed sealing strips 6 on the end face corresponding to the main flow-blocking plate 4. This design, with multiple evenly distributed and alternating sealing strips 6 integrally formed on the inner ends of the main flow-blocking plate 4 and the secondary flow-blocking plate 5, and the small chambers left between adjacent sealing strips 6, creates turbulence as gas flows through the sealing strips 6 and is separated by the alternating small chambers. This turbulent flow, through internal friction, collision, and mixing, is converted into internal energy, guiding the gas to dissipate energy and thus achieving effective sealing.

[0022] In one embodiment, the sealing sheet 2 and the main flow-blocking sheet 4 are each provided with two slots 7 symmetrically distributed along their length direction, and the main flow-blocking sheet 4 and the secondary flow-blocking sheet 5 are provided with matching blocks 8 corresponding to the slots 7. The slot 7 on the sealing sheet 2 and the block 8 on the main flow-blocking sheet 4 are adapted to be connected, so that the main flow-blocking sheet 4 can be detachably disposed on the back of the sealing sheet 2; The slot 7 on the main flow-restricting plate 4 and the locking block 8 on the secondary flow-restricting plate 5 are adapted to each other, allowing the secondary flow-restricting plate 5 to be detachably mounted on the main flow-restricting plate 4. This design, through the slots 7 machined at both ends of the sealing plate 2 and the main flow-restricting plate 4, and the locking blocks 8 integrally formed at both ends of the main flow-restricting plate 4 and the secondary flow-restricting plate 5, allows for the detachable assembly of the main flow-restricting plate 4 and the secondary flow-restricting plate 5 on the back of the sealing plate 2. This facilitates subsequent disassembly and maintenance, reducing maintenance costs.

[0023] In one embodiment, the main flow-blocking plate 4 forms a gradually narrowing gap of 15-20° on the sealing plate 2, and the secondary flow-blocking plate 5 forms a reverse gradually expanding gap of 10-15° on the main flow-blocking plate 4. This design utilizes support blocks machined at 15-20° angles at both ends of the main flow deflector 4, located at the positions of the locking blocks 8. The locking blocks 8, formed at the bottom of these support blocks, engage with the locking grooves 7 on the sealing sheet 2, creating a 15-20° gradually narrowing gap on the sealing sheet 2 in conjunction with the main flow deflector 4. Similarly, support blocks machined at opposite angles (10-15° angles) at both ends of the secondary flow deflector 5, located at the positions of the locking blocks 8, also have locking blocks 8 formed at the bottom. These locking blocks 8 engage with the locking grooves 7 on the main flow deflector 4, creating a 10-15° reverse gradually expanding gap on the main flow deflector 4 in conjunction with the secondary flow deflector 5. Thus, the main flow deflector 4 and the secondary flow deflector 5 form a floating structure, creating a dynamic sealing surface. The gradual narrowing effect accelerates the airflow, forming a local high-pressure zone, while the reverse diffusion effect consumes the kinetic energy of the airflow, resulting in a good sealing effect.

[0024] It should be noted that both the main flow deflector 4 and the secondary flow deflector 5 are made of elastic rubber sheets, which can achieve a floating support effect by utilizing the elasticity of the body.

[0025] In one embodiment, the elastic element 3 includes a support frame 31 vertically mounted on the sealing base 1 and a connecting rod 32 parallel to the sealing base 1 and extending through the support frame 31. A hinge seat is rotatably mounted on the connecting rod 32 corresponding to the end of the sealing sheet 2. The hinge seat is mounted on the sealing sheet 2. A spring 33 is sleeved on the portion of the connecting rod 32 located between the support frame 31 and the hinge seat. A locking nut is rotatably mounted on the lower side of the connecting rod 32 located between the support frame 31 and the hinge seat. With this design, the support frame 31 vertically welded to the inside of the sealing base 1, and the connecting rod 32 movably mounted through the opening of the support frame 31, along with the spring 33 sleeved on the portion of the connecting rod 32 located between the support frame 31 and the hinge seat, ensure that when the rotor rotates around the central cylinder and passes the end face of the sector plate, the sealing sheet 2 in the sealing structure mounted on one side of the radial partition will always be in contact with the end face of the sector plate fixed to the housing under the elastic support of the elastic element 3. This adaptively compensates for mechanical deviations and thermal deformation, ensuring a good sealing effect.

[0026] In one embodiment, the combined groove 21 has an outwardly flared opening at the outer end of the sealing sheet 2, and the combined block 22 has an outwardly flared end corresponding to the outwardly flared opening. This design, with the outwardly flared opening formed on the combined groove 21 and the outwardly flared end formed on the combined block 22, facilitates the insertion of the combined block 22 on one side of adjacently distributed sealing sheets 2 through the outwardly flared opening, enabling splicing between two adjacently distributed sealing sheets 2. This avoids gaps between segmented sealing units and prevents air leakage.

[0027] It should be noted that the outwardly flared opening formed on the combination groove 21 allows for the smooth insertion of the combination block 22.

[0028] In one embodiment, the sealing sheet 2 has an integrally formed inclined surface, which is used to abut against the end face of the fan-shaped plate fixed on the housing. This design, through the integrally formed inclined surface on the sealing sheet 2 and the elastic support of the cooperating elastic element 3, ensures that the inclined end of the sealing sheet 2 always abuts against the end face of the fan-shaped plate fixed on the housing, forming a closed space and guaranteeing a good sealing effect.

[0029] In one embodiment, the sealing sheet 2 is made of heat-resistant high-strength steel metal sealing strip. This design provides good high-temperature strength, creep resistance, and a controllable coefficient of thermal expansion.

[0030] Additional information: A layer of wear-resistant material such as high-chromium cast iron is welded onto the surface of sealing sheet 2.

[0031] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0032] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0033] Additionally, "multiple" refers to two or more.

[0034] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A sealing structure for a boiler rotary air preheater, comprising a radial partition plate on the rotor, the radial partition plate being used to divide the rotor into multiple sector-shaped compartments within the casing, wherein sector-shaped plates fixed to the casing are provided at the upper and lower ends of the rotor, dividing the rotor's flow portion into a flue gas side and an air side, the sealing structure being used to prevent air from leaking into the flue gas through the gaps between the upper and lower ends of the rotor and the sector-shaped plates, characterized in that... The sealing structure consists of multiple sealing units arranged sequentially in segments on the radial partition. Each sealing unit includes: A sealing base (1) is disposed on one side of the radial partition; The sealing sheet (2) is rotatably disposed on the inner side of the sealing base (1). Each sealing sheet (2) has a combination groove (21) and a combination block (22) at both ends. The combination groove (21) on one sealing sheet (2) is adapted to be inserted into the combination block (22) on the adjacent sealing sheet (2), so that the multiple sealing units installed in sections on the radial partition are sequentially spliced. Multiple elastic elements (3) are uniformly arranged on the inner side of the sealing sheet (2). The elastic elements (3) elastically support the sealing sheet (2) to compensate for thermal deformation and mechanical deviation. The dual-channel gap-removing flow-blocking plate includes a main flow-blocking plate (4) disposed on the back of the sealing plate (2) and a secondary flow-blocking plate (5) superimposed on the main flow-blocking plate (4), which are used to alternately form interception gaps and expansion cavities.

2. The sealing arrangement for a rotary air preheater of a boiler according to claim 1, characterized in that: The main flow-blocking plate (4) is provided with multiple evenly distributed sealing strips (6) on the end face of the sealing plate (2) in alternation, and a small chamber is left between each pair of sealing strips (6). The secondary flow-blocking plate (5) is also provided with multiple alternating and evenly distributed sealing strips (6) on the end face of the main flow-blocking plate (4).

3. The sealing arrangement of a rotary air preheater of a boiler according to claim 2, characterized in that: The sealing sheet (2) and the main flow-blocking sheet (4) are each provided with two slots (7) symmetrically distributed along their length direction. The main flow-blocking sheet (4) and the secondary flow-blocking sheet (5) are provided with matching blocks (8) corresponding to the slots (7). The slot (7) on the sealing sheet (2) and the block (8) on the main flow-blocking sheet (4) are adapted to be connected so that the main flow-blocking sheet (4) can be detachably disposed on the back of the sealing sheet (2); The slot (7) on the main flow-blocking plate (4) and the block (8) on the secondary flow-blocking plate (5) are adapted to be connected so that the secondary flow-blocking plate (5) can be detachably mounted on the main flow-blocking plate (4).

4. The sealing arrangement of a rotary air preheater of a boiler according to claim 3, characterized in that: The main flow-blocking plate (4) forms a gradually narrowing gap of 15-20° on the sealing plate (2), and the secondary flow-blocking plate (5) forms a gradually expanding gap of 10-15° in the opposite direction on the main flow-blocking plate (4).

5. The sealing arrangement for a rotary air preheater of a boiler as recited in claim 1, wherein: The elastic element (3) includes a support frame (31) vertically disposed on the sealing base (1) and a connecting rod (32) parallel to the sealing base (1) and passing through the support frame (31). A hinge seat is rotatably disposed on the connecting rod (32) at the end corresponding to the sealing plate (2). The hinge seat is disposed on the sealing plate (2). A spring (33) is sleeved on the part of the connecting rod (32) located between the support frame (31) and the hinge seat. A locking nut is rotatably disposed on the part of the connecting rod (32) located on the lower side of the support frame (31).

6. The sealing arrangement for a rotary air preheater of a boiler as recited in claim 1, wherein: The combined groove (21) is provided with an outward expansion opening at the outer end of the sealing sheet (2), and the combined block (22) is provided with an outward expansion end corresponding to the outward expansion opening.

7. The sealing arrangement for a rotary air preheater of a boiler as recited in claim 1, characterized in that: The sealing sheet (2) has an integrally formed inclined surface, which is used to abut against the end face of the fan-shaped plate fixed on the housing.

8. The sealing arrangement for a rotary air preheater of a boiler as recited in claim 1, characterized in that: The sealing strip (2) is made of heat-resistant high-strength steel metal sealing strip.

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