High-temperature-resistant sealing device based on fire grate driving beam

Abstract

The utility model belongs to the technical field of waste incineration, and relates to a high-temperature-resistant sealing device based on a fire grate driving beam, which is mounted on an ash bucket wall, is used for movably sealing the driving beam, and comprises a base box, a supporting block, a sealing assembly and a sealing sleeve, the base box is detachably and fixedly connected to the ash bucket wall and is arranged on the inner side of an ash bucket, and the supporting block is arranged on the base box; a hole for the driving beam to penetrate through is formed in the base; the supporting block is fixedly connected to the base box and arranged on the side, away from the ash bucket, of the base box, a clamping groove used for containing the sealing assembly is formed in the supporting block, the sealing assembly is arranged on a driving beam in a sleeving mode and placed in the clamping groove, and the two ends of the sealing sleeve are connected with the sealing assembly and the base box respectively. Therefore, movable sealing of the driving beam is achieved. On the basis that a sealing fan is omitted, effective sealing and long-time stable operation of the driving beam and the ash bucket in front-back reciprocating operation are achieved, and the sealing effect and the operation quality are guaranteed.

Description

Technical Field

[0001] This utility model belongs to the field of waste incineration technology and relates to a high-temperature resistant sealing device based on a grate drive beam. Background Technology

[0002] The incinerator is the core equipment in the waste incineration process, realizing the entire process of waste feeding, incineration, and ash removal. The stability and reliability of the equipment are essential for its overall operation. The grate is the device in the incinerator that achieves waste drying, combustion, and complete burning. Waste is conveyed and burned on the reciprocating grate plates, the core component. The reciprocating motion of the grate plates is driven by a drive beam in the high-temperature ash hopper below, which extends through the ash hopper and connects to an external hydraulic system. The stability and reliability of the drive beam are crucial for the continuous operation of the grate, and effectively sealing the drive beam as it exits the high-temperature ash hopper is a key challenge in achieving reliable operation.

[0003] Since the high-temperature ash hopper under the grate is a device that supplies combustion air to the furnace and also collects ash and slag leaking from the grate, the drive beam moves continuously through the wall of the ash hopper. During operation, the drive beam may also sway to some extent. This places high demands on the sealing of the ash hopper's perforation points, potentially leading to leaks. This would cause high-temperature air from the ash hopper and ash leaking from the grate to leak to the outside, seriously affecting the surrounding environment and operational quality. Existing applications typically install a metal sealing cover with a built-in sealing ring at the point where the drive beam exits the wall. A continuous sealing air supply is also introduced into the sealing cover to prevent the primary air from overflowing from the ash hopper. Due to the large volume of sealing air required, a separate sealing fan is needed. This solution is theoretically feasible, but over time, the sealing ring will wear down, reducing its sealing effect. Furthermore, the need for a continuous sealing fan increases equipment and operating costs, as well as maintenance and repair work and costs.

[0004] In summary, research on new sealing solutions and eliminating the need for sealing fans is a hot topic of industry attention and innovation, which is conducive to improving the operational quality of waste incineration, reducing operating costs, and promoting the healthy development of the industry. Utility Model Content

[0005] In view of this, the purpose of this utility model is to provide a high-temperature resistant sealing device based on a grate drive beam, which achieves effective sealing between the drive beam and the ash hopper during reciprocating motion and ensures stable operation over a long period of time by eliminating the sealing fan, thereby ensuring sealing effect and operational quality.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A high-temperature resistant sealing device based on a grate drive beam is installed on the wall of an ash hopper for the movable sealing of the drive beam. It includes a base box, a support block, a sealing assembly, and a sealing sleeve. The base box is detachably and fixedly connected to the wall of the ash hopper and arranged inside the ash hopper. It has holes for the drive beam to pass through.

[0008] The support block is fixedly connected to the base box and arranged on the side of the base box away from the ash hopper. It is provided with a slot for placing the sealing component. The sealing component is sleeved on the drive beam and placed in the slot. The two ends of the sealing sleeve are respectively connected to the sealing component and the base box to achieve a movable seal on the drive beam.

[0009] Furthermore, the slot is arranged along the axial direction of the drive beam, and the axial width of the sealing assembly is smaller than the axial width of the slot, so as to restrict the axial displacement of the sealing assembly while allowing the sealing assembly to have a certain amount of room to move in the slot.

[0010] Furthermore, the base box is a hollow box structure with a cover plate on the right end. The cover plate has a hole in the middle for the drive beam to pass through, and the left end of the base box is an open structure, which is fixedly connected to the opening of the ash hopper wall so that the drive beam passes through the ash hopper wall and the base box.

[0011] Furthermore, the cover plate is perpendicular to the drive beam.

[0012] Furthermore, the sealing assembly includes a support ring, a first sealing ring, a spacer ring, a second sealing ring, and a pressure plate. The first sealing ring, the spacer ring, and the second sealing ring are placed sequentially inside the support ring from the inside out. The pressure plate is bolted to the support ring and is arranged outside the second sealing ring to install the first sealing ring, the spacer ring, and the second sealing ring inside the support ring.

[0013] Furthermore, the first sealing ring and the second sealing ring are made of polytetrafluoroethylene and ammonium polyacrylamide, respectively.

[0014] Furthermore, the sealing sleeve is made of high-temperature resistant flexible PTFE cloth.

[0015] Furthermore, the inner diameter of the support ring and the pressure plate is larger than the outer diameter of the drive beam, and the inner diameters of the first sealing ring and the second sealing ring are the same and match the outer diameter of the drive beam to form a transition fit.

[0016] Furthermore, an annular cavity surrounding the drive beam is formed between the first sealing ring and the second sealing ring by the cooperation of the first sealing ring and the second sealing ring with the spacer ring;

[0017] An air inlet hole is provided on the support ring, and an annular groove communicating with the air inlet hole is provided on the outer circle of one side of the spacer ring. On the same side of the spacer ring and the annular groove, a plurality of radial grooves facing the axis and communicating with the annular groove and the inner cavity of the spacer ring are provided, so that the air inlet hole communicates with the annular cavity inside the spacer ring.

[0018] Furthermore, the base box, support ring, first sealing ring, spacer ring, second sealing ring, and pressure plate all adopt a symmetrical design with a split in the middle to facilitate on-site installation, thereby enabling online replacement and maintenance without removing the drive beam and meeting operation and maintenance requirements.

[0019] The beneficial effects of this utility model are as follows:

[0020] This invention provides a high-temperature resistant sealing device based on a grate drive beam, offering an innovative solution to the sealing problem of the drive beam penetrating the high-temperature ash hopper in a waste incinerator. This device not only ensures effective sealing between the drive beam and the ash hopper during reciprocating operation but also achieves stable operation over extended periods, significantly improving the operational quality and environmental benefits of waste incineration.

[0021] Firstly, this sealing device, through ingenious design, organically combines components such as the base box, support block, sealing assembly, and sealing sleeve to form a complete and efficient sealing system. The base box is detachably fixed to the ash hopper wall and has holes for the drive beam to pass through, facilitating both installation and maintenance. The sealing assembly is fitted onto the drive beam and connected to the base box via a flexible sealing sleeve. The sealing assembly is placed on a bottom-bearing support block, forming an axial limit. This design allows the sealing assembly to flexibly adjust with the movement of the drive beam, avoiding additional stress and wear, thus ensuring the stability and durability of the seal.

[0022] Secondly, the innovation of this device lies in the material selection and structural design of its sealing components. The use of a double-layered non-metallic sealing ring not only meets the requirements for high temperature resistance, corrosion resistance, and wear resistance, but also ensures tight contact with the drive beam, resulting in a good sealing effect. Simultaneously, the inner diameter of the sealing ring matches the outer diameter of the drive beam, forming a smooth fit, further improving the reliability and lifespan of the seal. Furthermore, the symmetrically split design of the base box makes online inspection and replacement more convenient and faster, significantly reducing maintenance costs and time.

[0023] Finally, this sealing device eliminates the traditional configuration of sealing air and corresponding fan design, and adopts a clever air inlet channel design and annular cavity. This allows it to utilize a small amount of existing secondary air to form a small-volume air curtain, and combined with a double-layer sealing ring structure, achieves a seal between the drive beam and the ash hopper. This innovative approach not only simplifies the system structure and reduces equipment costs, but also reduces the operation, maintenance, and energy consumption of the sealing fan, thereby saving operating costs. This groundbreaking design gives this sealing device a significant leading advantage in the waste incineration industry, providing strong technical support for the healthy development of the industry.

[0024] In summary, the high-temperature resistant sealing device based on a grate drive beam of this utility model demonstrates its leading position and practical value in the waste incineration industry with its innovative design, efficient sealing effect, stable operation performance and significant cost savings.

[0025] Other advantages, objectives, and features of this invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination and study, or may be learned from practice of this invention. The objectives and other advantages of this invention can be realized and obtained through the following description. Attached Figure Description

[0026] To make the objectives, technical solutions, and advantages of this utility model clearer, the preferred embodiments of this utility model will be described in detail below with reference to the accompanying drawings, wherein:

[0027] Figure 1 This is a schematic diagram of a sealing device based on a grate drive beam in Example 1;

[0028] Figure 2 This is a schematic diagram of the sealing assembly in Example 1;

[0029] Figure 3 for Figure 2 AA section view;

[0030] Figure 4 This is a plan view of the base in Example 1;

[0031] Figure 5 This is a schematic diagram of the support block in Example 1;

[0032] Figure 6 This is a schematic diagram of a sealing device based on a grate drive beam in Example 2;

[0033] Figure 7 This is a schematic diagram of the support ring structure in Example 2;

[0034] Figure 8 This is a schematic diagram of the fixed-distance ring in Example 2.

[0035] Reference numerals: 1. Ash hopper wall; 2. Base; 21. Cover plate; 3. Support block; 31. Slot; 4. Sealing assembly; 41. Support ring; 411. Air inlet hole; 42. Pressure plate; 43. First sealing ring; 44. Spacer ring; 44. Annular groove; 441. Radial through groove; 442. Second sealing ring; 45. Sealing sleeve; 5. Drive beam; 6. Detailed Implementation

[0036] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this utility model. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0037] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual pictures. They should not be construed as limiting the present invention. To better illustrate the embodiments of the present invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0038] In the accompanying drawings of this utility model, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," "right," "front," and "rear" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this utility model. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0039] Please see Figures 1-5 A high-temperature resistant sealing device based on a grate drive beam is installed on the ash hopper wall 1 for the movable sealing of the drive beam 6. It includes a base box 2, a support block 3, a sealing assembly 4, and a sealing sleeve 5. The base box 2 is detachably and fixedly connected to the ash hopper wall 1 and arranged inside the ash hopper. It has holes for the drive beam 6 to pass through.

[0040] The sealing component 4 is sleeved on the drive beam 6 and arranged on the side of the base box 2 away from the ash hopper (near the outside of the ash hopper). The two ends of the sealing sleeve 5 are respectively connected to the sealing component 4 and the base box 2, so as to achieve a movable seal on the drive beam 6 by the cooperation of the sealing component 4 with the sealing sleeve 5 and the base box 2.

[0041] The support block 3 is fixedly connected to the base box 2 and is arranged on the side of the base box 2 away from the ash hopper. It has a slot 31 for placing the sealing component 4, and the slot 31 is arranged along the reciprocating direction (i.e., axial direction) of the drive beam 6. The axial width of the sealing component 4 is 10-15mm smaller than the axial width of the slot 31, so as to limit the axial displacement of the sealing component 4 while allowing it some room to move within the slot 31. The depth of the slot 31 is adaptively set according to the size of the sealing component 4 to ensure that the sealing component 4 does not fall out of the slot 31.

[0042] Specifically, the base box 2 adopts a hollow box structure with a cover plate 21 on the upper end. The cover plate has a circular hole in the middle for the drive beam 6 to pass through. The lower end of the box is an open structure with a reserved outer edge for installation around it. It overlaps the wall of the ash hopper under the open grate and is fixed to the ash hopper wall 1 by bolts. The cover plate 21 is perpendicular to the drive beam 6 and forms a certain angle with the lower end (adapted according to the angle of the ash hopper wall).

[0043] Furthermore, the base box 2 adopts a symmetrical design with a split in the middle to facilitate installation on the drive beam 6, and the joint is welded closed after installation.

[0044] In another embodiment, the hole in the middle of the cover plate can be set to a corresponding hole shape according to the shape of the drive beam 6, such as a square.

[0045] The sealing assembly 4 includes a support ring 41, a first sealing ring 43, a spacer ring 44, a second sealing ring 45, and a pressure plate 42. The first sealing ring 43, the spacer ring 44, and the second sealing ring 45 are placed in the support ring 41 from bottom to top and pressed together by the pressure plate 42. The pressure plate 42 is bolted to the support ring 41 to install the first sealing ring 43, the spacer ring 44, and the second sealing ring 45 in the support ring 41.

[0046] Specifically, the sealing component 4 is installed in the base box 2 and is supported (placed) in the slot 31 of the support block 3 on the lower inner side of the base box using a movable connection. The support block 3 is welded to the side of the cover plate 21 in the base box 2 away from the ash hopper. The sealing component can move left and right within a certain range in the slot 31, and the drive beam passes through the center of the sealing component 4.

[0047] The sealing assembly comprises multiple circular, hollow, split-in, and symmetrically arranged overlapping components. From the inside out (from the inside of the ash hopper to the outside of the ash hopper), they are a support ring 41, a first sealing ring 43, a spacer ring 44, a second sealing ring 45, and a pressure plate 42. The pressure plate is fastened to the support ring by bolts. The first sealing ring 43, the spacer ring 44, and the second sealing ring 45 are sequentially fixed in the inner cavity of the support ring by the pressure plate. The circumferential boss at the end of the support ring 41 near the base box 2 is connected to the circumferential boss on the inner side of the upper cover of the base box by a sealing sleeve 5 made of high-temperature resistant flexible PTFE cloth, thereby achieving the connection and sealing between the sealing assembly 4 and the base box 2.

[0048] The sealing sleeve 5 can be installed as a whole from the end of the drive beam, or it can be cut open and installed on the outside of the drive beam and then bonded at high temperature. Except for the sealing sleeve 5 and the sealing ring, all other parts are made of metal.

[0049] Furthermore, both the circumferential boss at one end of the support ring 41 near the base box 2 and the circumferential boss on the inner side of the upper cover of the base box have annular grooves to cooperate with the retaining ring or clamp to fix the sealing sleeve 5.

[0050] Furthermore, the inner diameter of the support ring 41 and the pressure plate 42 is larger than the outer diameter of the drive beam 6, and they do not contact the drive beam 6. The two circular sealing rings are installed in the groove of the support ring 41 at intervals through the spacer ring 44. The two sealing rings are made of 5mm thick polytetrafluoroethylene and ammonium polyacrylamide with a certain hardness, respectively, or both are made of polytetrafluoroethylene, or both are made of ammonium polyacrylamide. The inner diameter of the first sealing ring 43 and the second sealing ring 45 is the same as or slightly larger than the outer diameter of the drive beam 6, forming a transition fit and ensuring that there is no friction between them. That is, the two sealing rings maintain overall contact with the outer surface of the drive beam, achieving double-layer effective sealing.

[0051] The sealing component 4 and the base box are flexibly connected by the sealing sleeve 5. By limiting the movement of the support block 3, the sealing component 4 can fluctuate within a small range with the drive beam 6 during operation without wear or damage. The sealing ring has a certain degree of flexibility, good sealing performance, good high temperature resistance, corrosion resistance and wear resistance, and long service life.

[0052] The drive beam 6 passes through the cover plate 21 of the base box 2 and extends out of the ash hopper. The sealing component 2 ensures that the drive beam maintains the isolation and sealing between the inside and outside of the ash hopper during the reciprocating operation. After a certain period of operation, the sealing component 4 can be replaced online without disassembling the base box 2, making maintenance more convenient.

[0053] Specifically, the base box 2, support ring 41, first sealing ring 43, spacer ring 44, second sealing ring 45, and pressure plate 42 all adopt a symmetrical design with a split in the middle to facilitate on-site installation. This allows for online replacement and maintenance without removing the drive beam, meeting operational and maintenance requirements.

[0054] Example 2

[0055] Please see Figures 6-8 The difference between this embodiment and embodiment 1 is that in this embodiment, the first sealing ring 43 and the second sealing ring 45 cooperate with the spacer ring 44 to form an annular cavity surrounding the drive beam 6. An air inlet hole 411 is provided on the support ring 41. An annular groove 441 communicating with the air inlet hole 411 is provided on the outer circle of one side of the spacer ring 44. On the same side of the spacer ring 44 and the annular groove 441, a plurality of radial through grooves 442 facing the axis and communicating with the annular groove 441 and the inner cavity of the spacer ring are provided, so that the air inlet hole 411 communicates with the annular cavity inside the spacer ring.

[0056] Specifically, a secondary air branch pipe is drawn from the combustion secondary air of the incinerator and connected to the end of the air inlet 411 away from the annular groove 441. This allows the use of pressurized secondary air as sealing air. The air enters the annular groove 441 outside the spacer ring through the air inlet 411 of the support ring, and then enters the annular cavity inside the spacer ring near the drive beam through multiple radial grooves 442. This forms a sealed air curtain around the drive beam, preventing the primary air in the ash hopper from leaking out of the ash hopper through the small gap between the first sealing ring 43 and the drive beam 6, further ensuring the seal between the drive beam and the ash hopper.

[0057] Since the gap between the first sealing ring 43 and the second sealing ring 45 and the drive beam is very small, and the volume of the annular cavity between the spacer ring 44 and the drive beam is also relatively small, the air volume required to form a sealing air curtain in the annular cavity is also relatively small. Therefore, there is no need to set up a separate sealing fan. A small amount of air volume can be diverted from the existing secondary air surplus of the incinerator to meet the requirements. Furthermore, since the amount of secondary air diverted is small, there is no need to design or improve the existing secondary air system.

[0058] Specifically, taking an incinerator with a processing capacity of 600 tons / day as an example, the parameters of its primary and secondary air are shown in Table 1 below:

[0059] Table 1

[0060] Fan Fan Design air volume Design pressure unit <![CDATA[Nm 3 / h]]> Pa Primary air fan A wind 70000 4200 Secondary air fan Secondary wind 37000 5200 Sealing fan Sealed air 6000 7000

[0061] One type of air enters the ash hopper under the grate and is then blown into the furnace through the air holes of the grate plates above the ash hopper to aid combustion; the sealing device is to prevent the primary air with temperature and pressure in the ash hopper from leaking out through the ash hopper wall due to the reciprocating motion of the drive beam.

[0062] Secondary air is blown into the furnace through tuyeres around the upper outlet of the furnace to disturb the flue gas and promote its complete combustion.

[0063] Because the existing sealing devices require a large air volume and pressure, and the parameters are not matched, a separate sealing fan is needed to supply air.

[0064] In this embodiment, the annular cavity forming a sealed air curtain around the drive beam has a very small volume, requiring only a small air volume to meet the needs. Taking a 600-ton / day incinerator as an example, the air inlet 411 of the support ring 41 can be 2mm in diameter. The annular groove 441 on the outer circumference of the spacer ring can be a square with a side length of 2mm, and four radial through-slots 442, each with a cross-section of 4mm*2mm and facing the axis, are evenly distributed along the circumference. The height of the annular cavity inside the spacer ring between the first sealing ring 43 and the second sealing ring 45 can be 3mm. The thickness of the first sealing ring 43 and the second sealing ring 45 can be 5mm, and the thickness of the spacer ring 44 can be 7mm, requiring only 300Nm. 3 A flow rate of 5000Pa / h is sufficient to meet the sealing requirements. A small amount of surplus air can be directly diverted from the secondary air supply, so there is no need to install a separate fan, and it will not affect the normal use of the secondary air supply.

[0065] Example 3

[0066] The difference between this embodiment and embodiment 2 is that the air inlet hole of the support ring 41 in this embodiment is not ventilated. Instead, an oil nozzle is connected to the end of the air inlet hole 411 away from the annular groove. High-temperature lubricating grease is periodically added to the air inlet hole through the oil nozzle, so that the annular cavity between the spacer ring 44 and the drive beam is filled with high-temperature lubricating grease. The semi-solid high-temperature lubricating grease isolates the inside and outside of the ash hopper and seals the gap of the drive beam movement.

[0067] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of this technical solution, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A high-temperature resistant sealing device based on a grate drive beam, installed on the wall of an ash hopper, for the movable sealing of the drive beam, characterized in that: It includes a base box, a support block, a sealing assembly, and a sealing sleeve. The base box is detachably and fixedly connected to the wall of the ash hopper and arranged inside the ash hopper. It has holes for the drive beam to pass through. The support block is fixedly connected to the base box and arranged on the side of the base box away from the ash hopper. It is provided with a slot for placing the sealing component. The sealing component is sleeved on the drive beam and placed in the slot. The two ends of the sealing sleeve are respectively connected to the sealing component and the base box to achieve a movable seal on the drive beam.

2. The high-temperature resistant sealing device based on a grate drive beam according to claim 1, characterized in that: The slot is arranged along the axial direction of the drive beam, and the axial width of the sealing assembly is smaller than the axial width of the slot, so as to restrict the axial displacement of the sealing assembly while allowing the sealing assembly to have a certain amount of room to move in the slot.

3. The high-temperature resistant sealing device based on a grate drive beam according to claim 1, characterized in that: The base box is a hollow box structure with a cover plate on the right end. The cover plate has a hole in the middle for the drive beam to pass through, and the left end of the base box is an open structure, which is fixedly connected to the opening of the ash hopper wall so that the drive beam can pass through the ash hopper wall and the base box.

4. The high-temperature resistant sealing device based on a grate drive beam according to claim 3, characterized in that: The cover plate is perpendicular to the drive beam.

5. The high-temperature resistant sealing device based on a grate drive beam according to claim 1, characterized in that: The sealing assembly includes a support ring, a first sealing ring, a spacer ring, a second sealing ring, and a pressure plate. The first sealing ring, the spacer ring, and the second sealing ring are placed sequentially inside the support ring from the inside out. The pressure plate is bolted to the support ring and is arranged outside the second sealing ring to install the first sealing ring, the spacer ring, and the second sealing ring inside the support ring.

6. The high-temperature resistant sealing device based on a grate drive beam according to claim 5, characterized in that: The first sealing ring and the second sealing ring are made of polytetrafluoroethylene and ammonium polyacrylamide, respectively.

7. The high-temperature resistant sealing device based on a grate drive beam according to claim 5, characterized in that: The sealing sleeve is made of high-temperature resistant flexible PTFE cloth.

8. The high-temperature resistant sealing device based on a grate drive beam according to claim 5, characterized in that: The inner diameter of the support ring and the pressure plate is larger than the outer diameter of the drive beam. The inner diameters of the first sealing ring and the second sealing ring are the same and match the outer diameter of the drive beam to form a transition fit.

9. The high-temperature resistant sealing device based on a grate drive beam according to claim 5, characterized in that: An annular cavity surrounding the drive beam is formed between the first and second sealing rings by the cooperation of the first sealing ring and the second sealing ring with the spacer ring. An air inlet hole is provided on the support ring, and an annular groove communicating with the air inlet hole is provided on the outer circle of one side of the spacer ring. On the same side of the spacer ring and the annular groove, a plurality of radial grooves facing the axis and communicating with the annular groove and the inner cavity of the spacer ring are provided, so that the air inlet hole communicates with the annular cavity inside the spacer ring.

10. The high-temperature resistant sealing device based on a grate drive beam according to claim 9, characterized in that: The base box, support ring, first sealing ring, spacer ring, second sealing ring, and pressure plate are all designed with a symmetrical, split-in-the-middle shape to facilitate on-site installation.

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