A sealing device for a rotary flue gas heat exchanger
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- GUANGDONG RED BAY POWER GENERATION CO LTD
- Filing Date
- 2024-01-03
- Publication Date
- 2026-07-24
Smart Images
Figure CN117704413B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of heat exchanger technology, and more particularly to a sealing device for a rotary flue gas heat exchanger. Background Technology
[0002] Rotary flue gas heat exchangers are important heat exchange devices used in large boilers. They utilize the heat from boiler flue gas to heat the air needed for combustion, thereby improving boiler efficiency. During hot operation, all components of the flue gas heat exchanger expand due to heat. Because of temperature differences between different parts of the heat exchanger, the rotor undergoes mushroom-shaped deformation, and the gaps between the rotor and the fan-shaped plates, axial sealing plates, etc., also change. If the gaps are too large, the air leakage rate of the flue gas heat exchanger will be high; if they are too small, the heat exchanger may seize up.
[0003] Currently, controlling the air leakage rate of flue gas heat exchangers is one of the main energy-saving indicators for power plants. Various sealing technologies are being tried, but problems such as large air leakage, short lifespan, or low reliability have emerged. This problem is particularly prominent under the current low load conditions in the power industry. Summary of the Invention
[0004] The main objective of this invention is to overcome the shortcomings of existing technologies and provide a sealing device for a rotary flue gas heat exchanger. This elastic sealing device has the advantages of long service life and high reliability. Simultaneously, it can reduce direct air leakage by decreasing the radial air leakage gap of the flue gas heat exchanger, thereby reducing the air leakage rate of the flue gas heat exchanger, thus reducing the unit's coal consumption and improving economic efficiency.
[0005] The technical solution adopted by the present invention to achieve its technical objective is: a sealing device for a rotary flue gas heat exchanger, including an elastic sealing device, which is installed on the flue gas heat exchanger. The elastic sealing device is installed on the fan-shaped plates at both ends of the flue gas side. Unlike the traditional method of installing the sealing device on the rotor, it can be adjusted online as the vertical position of the fan-shaped plates changes. The elastic sealing device includes a self-cleaning rotating shaft, an adjusting limit rod, a two-in-one sleeve, a spring, an elastic sealing plate, and a side plate.
[0006] The spring is fixedly installed inside the two-in-one sleeve, and one end of it extends to the outside of the two-in-one sleeve and is hinged to the middle end of the sealing sheet. The other end is fixedly installed with an air inlet pipe, which is fixedly inserted through the top of the two-in-one sleeve.
[0007] The adjusting limit rod is fixedly installed on one side of the two-in-one sleeve, and one end of it is hinged to one end of the elastic sealing sheet. The position and height of the elastic sealing sheet can be adjusted by adjusting the adjusting limit rod. The adjusting limit rod can adjust the descent height of the sealing sheet according to the air leakage gap, while preventing the sealing sheet from falling too far and getting stuck with the rotor sealing sheet. It has the dual functions of "adjustable" and "limited".
[0008] The side plate is fixedly installed on the other side of the two-in-one sleeve, and one end of it is rotatably connected to one end of the elastic sealing sheet through the self-cleaning shaft.
[0009] Preferably, the elastic sealing device further includes a cooling air duct, the upper part of the two-in-one sleeve is connected to the cooling air duct, compressed air is introduced through the inside of the cooling air duct, and the spring 7 is cooled and cleaned through the air inlet pipe. The air inlet pipe is located inside the cooling air duct 8, and the cooling air duct is connected online to the cooling and purging equipment to facilitate online cooling and cleaning.
[0010] Meanwhile, the lower part of the two-in-one sleeve is provided with a ventilation ash outlet. The compressed air inside the cooling air duct blows through the ventilation ash outlet, allowing the dust inside the two-in-one sleeve to be discharged in time, preventing the accumulation of dust inside, which could lead to spring failure, jamming of internal mechanical parts, and other problems.
[0011] Preferably, the self-cleaning shaft consists of a shaft and a rotating bushing. The rotating bushing is designed in an arc shape, and the end of the arc surface is designed in a sawtooth shape. With the relative rotation of the shaft and the rotating bushing, it is easy to realize the automatic cleaning of internal dust, thereby realizing the automatic cleaning of dust during the rotation of the sealing sheet and preventing dust accumulation and jamming during operation.
[0012] Preferably, the flue gas heat exchanger includes a rotor sealing plate, a sector plate, and a rotor. The length of the sealing plate is gradient-distributed in the radial direction of the sector plate, gradually increasing from the center of the rotor outwards. This is to ensure that the length of the sealing plate is consistent with the curvature radius change law of the rotor under heat deformation, thereby increasing the effective contact area between the elastic sealing plate and the rotor sealing plate.
[0013] Preferably, the flue gas heat exchanger further includes a housing, and an enhanced sealing device is provided inside the housing. The enhanced sealing device is located at the position of the sector plate and maintains a radial seal with the rotor. By providing the enhanced sealing device, the radial sealing effect of the rotor is further increased.
[0014] Preferably, the enhanced sealing device includes an airbag, which is fixedly installed inside the housing. The airbag has two surfaces exposed outside the housing. One surface faces the inside of the housing and is sealed to the rotor. The surface facing the inside of the housing facilitates contact with the radial end of the rotor. The other surface faces the sector plate and is fixedly connected to a Y-shaped pipe. The surface facing the sector plate is also exposed to facilitate connection to the Y-shaped pipe and other components.
[0015] The two branch pipes of the Y-shaped pipe are fixedly connected to a cylinder. A positioning spring is fixedly installed at the middle of the cylinder. Pistons are fixedly installed at both ends of the positioning spring. The pistons are in a sliding and sealed connection with the cylinder. When the piston is subjected to air pressure, it will be pushed towards the positioning spring to absorb the pressure. When the piston is not under pressure, the positioning spring pushes the piston away from it until the piston is no longer subjected to elastic force.
[0016] Preferably, the airbag is fixed in an inlay groove inside the outer shell. A concave groove for installing a Y-shaped pipe is provided on both sides of the inlay groove. One end of the concave groove is connected to the inlay groove, and the other end is connected to an installation groove for installing a cylinder. The concave groove and the installation groove are also provided inside the outer shell. By setting up the concave groove, the installation groove and the inlay groove, multiple components are hidden inside the outer shell.
[0017] A flue gas purification system is installed below the flue gas heat exchanger. The flue gas purification system includes a filter screen shell that is fixedly installed at the bottom of the outer shell. The filter screen shell is designed as a quarter-sphere structure, and dust discharge pipes are fixedly installed at both ends of its bottom. The dust and other dust blocked by the filter screen shell are partially discharged through the dust discharge pipes.
[0018] The filter housing is internally connected to a rotating shaft and a first mesh cover, a second mesh cover, and a leaf plate fixedly installed on the rotating shaft.
[0019] The first mesh cover is fixedly installed in the middle of the rotating shaft, and the second mesh cover is fixedly fixed at both ends of the rotating shaft symmetrically about the first mesh cover. An ionization module is fixedly installed inside both the first and second mesh covers. The first and second mesh covers isolate large dust particles in the flue gas, while the ionization modules electrolytically separate odors or harmful gases in the flue gas. This is mainly achieved by using an electric field to ionize molecules in the air, thereby generating a large number of ions. These ions can combine with dust particles in the air to form charged particles, which are easy to collect, thus purifying the flue gas.
[0020] Multiple blades are provided, symmetrically installed on the rotating shaft, the first screen cover, and the second screen cover. When the multiple blades are unfolded, the overall plane forms an elliptical structure. Through the arrangement of the blades, when a large amount of flue gas rushes into the flue gas heat exchanger for heat exchange, the impact force of the flue gas can drive the blades to rotate. When the blades rotate, it is convenient to diffuse the molecules ionized by the ionization module. At the same time, a small speed increaser is provided at the connection between the rotating shaft and the filter screen cover to facilitate the rotation of the rotating shaft.
[0021] Preferably, the filter screen shell has a multi-layer structure, consisting of a grid plate, a pre-filter plate, and a filter element plate from the outermost layer to the innermost layer. The grid plate and the pre-filter plate are both configured with a U-shaped structure, with the filter element plate wrapped in the middle layer. The pre-filter plate and the filter element plate are activated carbon plates of different densities. After the flue gas undergoes preliminary ionization treatment to remove odors or harmful substances and is reduced to small particulate dust, the flue gas is filtered through the filter screen shell before being discharged. The flue gas undergoes layer-by-layer filtration through the grid plate, the pre-filter plate, and the filter element plate.
[0022] Compared with the prior art, the beneficial effects of the present invention are:
[0023] The sealing device of this rotary flue gas heat exchanger boasts advantages such as long service life and high reliability. It also reduces direct air leakage by decreasing the radial leakage gap of the flue gas heat exchanger, thereby lowering the leakage rate and ultimately reducing the unit's coal consumption and improving economic efficiency. Furthermore, this elastic sealing device features a simple installation process and low construction costs, eliminating the need to remove or damage existing sealing devices. When used in conjunction with existing sealing technologies, it can further reduce the leakage rate. Additionally, a reinforced sealing device is also included to enhance the radial seal.
[0024] This flue gas purification system based on a rotary flue gas heat exchanger electrolytically separates odorous or harmful gases in the flue gas, transforming chemical pollutants into physical pollutants, thereby purifying the flue gas. After most of the flue gas pollutants are reduced to small particulate dust, they are filtered layer by layer to ultimately achieve the purpose of waste gas treatment. Attached Figure Description
[0025] Figure 1 This is a top view of the structure of the elastic sealing device installed on the sector plate of the air preheater.
[0026] Figure 2 This is a schematic diagram of the main cross-sectional structure of the rotor seal and the rotor in contact with the elastic seal.
[0027] Figure 3 This is a schematic diagram of the main sectional view of the elastic sealing device.
[0028] Figure 4 A top view of the structure in which the sealing device is installed inside the air preheater housing to enhance sealing.
[0029] Figure 5 for Figure 4 A top-view enlarged structural schematic diagram of the reinforced sealing device.
[0030] Figure 6 This is a bottom view of the flue gas purification system installed on the sector plate of the air preheater.
[0031] Figure 7 This is a top view of the flue gas purification system.
[0032] Figure 8 This is a schematic diagram of the structure of the filter screen shell.
[0033] in:
[0034] 1-Rotor sealing plate; 2-Elastic sealing device; 3-Fan-shaped plate; 4-Self-cleaning shaft; 5-Adjusting limit rod; 6-Two-in-one sleeve; 7-Spring; 8-Cooling air duct; 9-Ventilation dust outlet; 10-Elastic sealing plate; 11-Side plate; 12-Rotor; 13-Outer shell; 14-Reinforced sealing device; 15-Airbag; 16-Y-shaped pipe; 17-Cylinder; 18-Piston; 19-Positioning spring; 20-Concave groove; 21-Mounting groove; 22-Inlay groove; 23-Filter screen shell; 24-Dust exhaust pipe; 25-Rotating shaft; 26-First screen cover; 27-Second screen cover; 28-Ionization module; 29-Banner plate; 30-Grid plate; 31-Primary filter plate; 32-Filter element plate. Detailed Implementation
[0035] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use. They are only for the convenience of describing this invention 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, they should not be construed as limitations on this invention. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0036] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.
[0037] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. However, it should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of the invention. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of the invention. Example 1
[0038] Please see Figure 1-3 A sealing device for a rotary flue gas heat exchanger includes an elastic sealing device 2, which is installed on the flue gas heat exchanger. The elastic sealing device 2 is installed on the fan-shaped plates 3 at both ends of the flue gas side. Unlike the traditional method of installing the sealing device on the rotor, the elastic sealing device 2 can be adjusted online as the vertical position of the fan-shaped plates 3 changes.
[0039] Specifically, such as Figure 3 As shown, the elastic sealing device 2 includes a self-cleaning rotating shaft 4, an adjusting limit rod 5, a two-in-one sleeve 6, a spring 7, an elastic sealing sheet 10, and a side plate 11.
[0040] The adjusting limit rod 5 is fixedly installed on one side of the two-in-one sleeve 6, and one end of it is hinged to one end of the elastic sealing sheet 10. The position and height of the elastic sealing sheet 10 can be adjusted by adjusting the adjusting limit rod 5.
[0041] The adjusting limit rod 5 is a double-rod combination, with a through hole at the top of each limit rod. The descent height of the elastic sealing plate 10 can be adjusted by combining different positions of the through holes on the two limit rods. Simultaneously, the position limitation by the limit rods prevents the elastic sealing plate 10 from descending too far, thus preventing jamming between the elastic sealing plate 10 and the rotor sealing plate 1. The adjusting limit rod 5 allows for adjusting the descent height of the sealing plate according to the air leakage gap, while preventing excessive descent and jamming between the sealing plate and the rotor sealing plate, thus possessing both "adjustable" and "limiting" functions. Furthermore, the tilt angle of the elastic sealing plate 10 is consistent with the rotation direction of the rotor 12, ensuring contact between the rotor sealing plate 1 and the elastic sealing plate 10 without causing jamming.
[0042] The side plate 11 is fixedly installed on the other side of the two-in-one sleeve 6, and one end of it is rotatably connected to one end of the elastic sealing sheet 10 through the self-cleaning rotating shaft 4;
[0043] The self-cleaning rotating shaft 4 consists of a rotating shaft and a rotating bushing. The rotating bushing is designed in an arc shape, and the end of the arc surface is designed in a sawtooth shape. With the relative rotation of the rotating shaft and the rotating bushing, it is easy to realize the automatic cleaning of internal dust, thereby realizing the automatic cleaning of dust during the rotation of the sealing sheet and preventing dust accumulation and jamming during operation.
[0044] Spring 7 is fixedly installed inside the two-in-one sleeve 6, with one end extending to the outside of the two-in-one sleeve 6 and hinged to the middle of the sealing plate 10. The other end is fixedly installed with an air inlet pipe, which passes through the top of the two-in-one sleeve 6. Spring 7 transforms the contact collision between rotor sealing plate 1 and elastic sealing plate 10 into an elastic collision, which is different from the traditional hard contact. It has a buffering and shock absorption function, improving the service life of rotor sealing plate 1 and elastic sealing plate 10. At the same time, the two-in-one sleeve 6 is designed outside spring 7 to prevent spring 7 from being scoured by flue gas and damaged by soot blowing, thereby extending the service life of spring 7.
[0045] Furthermore, the elastic sealing device 2 also includes a cooling air duct 8. The upper part of the two-in-one sleeve 6 is connected to the cooling air duct 8. Compressed air is introduced through the inside of the cooling air duct 8 and cooled and cleaned by the air inlet pipe. The air inlet pipe is located inside the cooling air duct 8. The cooling air duct 8 is connected online to the cooling and purging equipment to facilitate online cooling and cleaning.
[0046] Meanwhile, the lower part of the two-in-one sleeve 6 is provided with a ventilation ash outlet hole 9. The compressed air inside the cooling air duct 8 blows the dust inside the two-in-one sleeve 6, allowing the dust inside to be discharged in time through the ventilation ash outlet hole 9, preventing the accumulation of dust inside, which could lead to spring failure, jamming of internal mechanical parts, and other problems.
[0047] Furthermore, specifically as follows Figure 1 , 2 As shown, the flue gas heat exchanger includes a rotor sealing plate 1, a sector plate 3, and a rotor 12. The length of the sealing plate 10 is distributed in a gradient in the radial direction of the sector plate 3, gradually increasing from the center of the rotor 12 outwards. This is to make it consistent with the curvature radius change law of the rotor 12 under thermal deformation, thereby increasing the effective contact area between the elastic sealing plate 10 and the rotor sealing plate 1.
[0048] Due to different heating conditions, the rotor 12 will undergo mushroom-shaped deformation. The relative deformation of the rotor 12 gradually increases from the center outwards, and the corresponding radius of curvature gradually increases. The length of the elastic sealing sheet 10 gradually increases from the center outwards in the radial direction. That is, the length of the elastic sealing sheet 10 near the center of the rotor 12 is the smallest, and the length of the outermost elastic sealing sheet 10 is the longest. This increases the effective contact area between the rotor sealing sheet 1 and the elastic sealing sheet 10 at different positions in the radial direction, thereby reducing the air leakage gap and reducing the air leakage rate.
[0049] Specifically, in use, the elastic sealing device 2 is installed on the fan-shaped plates at both ends of the flue gas side, and its position can be adjusted up and down with the fan-shaped plates according to the specific air leakage gap;
[0050] The two-in-one sleeve 6 has a spring 7 inside and an elastic sealing sheet 10 at the bottom. The elastic sealing sheet 10 contacts the rotor sealing sheet 1 of the rotor 12, reducing radial air leakage during the rotation of the rotor 12. The spring 7 makes the contact between the two sealing sheets elastic rather than hard contact, which improves the service life of the sealing sheets and can absorb vibration.
[0051] The two-in-one sleeve 6 prevents the spring 7 from being exposed to high-temperature flue gas and being eroded by the flue gas and damaged by the soot blower; the upper part of the two-in-one sleeve 6 is connected to the cooling air duct 8, which can realize online cooling, and the lower part of the two-in-one sleeve 6 is opened with ventilation and dust discharge hole 9, which can allow cooling air to circulate and dust to be discharged in time. Example 2
[0052] Please see Figure 4-5 Based on the above embodiments, the rotary flue gas heat exchanger also includes a housing 13, and a reinforced sealing device 14 is provided inside the housing 13. The reinforced sealing device 14 is located at the position of the fan-shaped plate 3 and keeps the rotor 12 sealed in the radial direction. By setting the reinforced sealing device 14, the sealing effect of the rotor 12 in the radial direction is further increased.
[0053] The enhanced sealing device 14 includes an airbag 15, which is fixed in an inlay groove 22 inside the outer casing 13. The airbag 15 is fixedly installed inside the outer casing 13 and has two surfaces exposed outside the outer casing 13. One surface faces the inside of the outer casing 13 and is sealed to the rotor 12. The surface facing the inside of the outer casing 13 facilitates contact with the radial end of the rotor. The other surface faces the direction of the fan-shaped plate 3 and is fixedly connected to a Y-shaped pipe 16. A concave groove 20 for installing the Y-shaped pipe 16 is provided on both sides of the inlay groove 22. The surface facing the direction of the fan-shaped plate 3 is also exposed to facilitate connection of the Y-shaped pipe 16 and other components.
[0054] Two branch pipes of the Y-shaped pipe 16 are fixedly connected to the cylinder 17. One end of the concave groove 20 is connected to the inlay groove 22, and the other end is connected to the mounting groove 21 for mounting the cylinder 17. A positioning spring 19 is fixedly installed in the middle of the cylinder 17. Pistons 18 are fixedly installed at both ends of the positioning spring 19. The pistons 18 and the cylinder 17 maintain a sliding seal connection. When the piston 18 is subjected to air pressure, it will be pushed towards the positioning spring 19 to absorb the pressure. When the piston 18 is not under pressure, the positioning spring 19 pushes the piston 18 away from it until the piston 18 is no longer subjected to elastic force.
[0055] Specifically, during use, when the rotor 12 rotates, the rotor 12 will come into contact with the airbag 15. Due to the limited distance, the radial part of the rotor 12 will obviously exert a squeezing force on the airbag 15. Once the two are squeezed, the radial sealing between them can be improved. At the same time, when the airbag 15 is squeezed, the air pressure inside it will enter the two ends of the cylinder 17 through the Y-shaped pipe 16, thereby increasing the air pressure at both ends of the cylinder 17, pushing the piston 18 to move towards the positioning spring 19, and absorbing the pressure through the positioning spring 19.
[0056] After the rotor 12 leaves the contact surface of the airbag 15, due to the rebound force of the positioning spring 19, the positioning spring 19 pushes the piston 18 to move away from it, and the piston sends the air pressure back into the airbag 15. Thus, the airbag 15 is always in a bulging state, avoiding contact with the rotor 12 in the radial direction, thereby avoiding radial air leakage and increasing its sealing performance.
[0057] The solution in this embodiment can be selectively combined with solutions in other embodiments. Example 3
[0058] Please see Figure 6-8 Based on the above embodiments, the rotary flue gas heat exchanger has a sealing device and a flue gas purification system is provided below the flue gas heat exchanger. The flue gas purification system includes a filter screen shell 23 fixedly installed at the bottom of the outer shell 13. The filter screen shell 23 is configured as a quarter-sphere structure, and dust discharge pipes 24 are fixedly installed at both ends of its bottom. The dust and other dust blocked by the filter screen shell 23 are partially discharged through the dust discharge pipes 24.
[0059] Specifically, such as Figure 8 As shown, the filter screen shell 23 has a multi-layer structure, from the outer layer to the inner layer, namely the grid plate 30, the primary filter plate 31 and the filter element plate 32. The grid plate 30 and the primary filter plate 31 are both set as a U-shaped structure, and the filter element plate 32 is wrapped in the middle layer. The primary filter plate 31 and the filter element plate 32 are set as activated carbon plates of different densities.
[0060] The filter housing 23 is rotatably connected to a rotating shaft 25 and a first screen cover 26, a second screen cover 27 and a leaf plate 29 fixedly installed on the rotating shaft 25.
[0061] The first mesh cover 26 is fixedly installed in the middle of the rotating shaft 25, and the second mesh cover 27 is fixedly fixed at both ends of the rotating shaft 25 with respect to the first mesh cover 26. An ionization module 28 is fixedly installed inside both the first mesh cover 26 and the second mesh cover 27.
[0062] Large dust particles in the flue gas are isolated by the first mesh cover 26 and the second mesh cover 27. At the same time, the ionization module 28 electrolytically separates odors or harmful gases in the flue gas. This is mainly achieved by using an electric field to ionize molecules in the air, thereby generating a large number of ions. These ions can combine with dust particles in the air to form charged particles, which are easy to collect, thus purifying the flue gas. After the flue gas undergoes preliminary ionization treatment of odors or harmful gases and is reduced to small dust particles, it is discharged after being filtered through the filter screen 23. The flue gas then undergoes layer-by-layer filtration through the grid plate 30, the primary filter plate 31, and the filter element plate 32.
[0063] Multiple blades 29 are provided, symmetrically installed on the rotating shaft 25, the first screen 26, and the second screen 27. When the multiple blades 29 are unfolded, the overall plane forms an elliptical structure. Through the arrangement of the blades 29, when a large amount of flue gas rushes into the flue gas heat exchanger for heat exchange, the impact force of the flue gas can drive the blades 29 to rotate. When the blades rotate, it is convenient to diffuse the molecules ionized by the ionization module 28. At the same time, a small speed increaser is provided at the connection between the rotating shaft 25 and the filter screen 23 to facilitate the rotation of the rotating shaft 25.
[0064] Specifically, during the heat exchange process in the flue gas heat exchanger, the boiler flue gas contains a large amount of dust and polluting gases. To prevent the flue gas from being discharged randomly during the heat exchange process, after passing through the flue gas heat exchanger, the flue gas first enters the filter screen shell 23. The ionization module 28 electrolytically separates the odors or harmful gases in the flue gas, achieving the purpose of purifying the flue gas. Then, through the rotation of the blades 29, the molecules ionized by the ionization module 28 are diffused and accelerated to combine into small dust particles, changing chemical pollution into physical pollution. Thus, after most of the flue gas pollutants have been turned into small dust particles, the flue gas is filtered through the filter screen shell 23 and discharged. This layer-by-layer filtration process ultimately achieves the purpose of waste gas treatment.
[0065] The solution in this embodiment can be selectively combined with solutions in other embodiments.
[0066] It should be noted that although the above embodiments have been described herein, this does not limit the scope of patent protection of this invention. Therefore, any changes and modifications made to the embodiments described herein based on the innovative concept of this invention, or equivalent structural, procedural, or functional transformations made using the description and drawings of this invention, directly or indirectly applying the above technical solutions to other related technical fields, are all included within the scope of protection of this invention.
Claims
1. A sealing device for a rotary flue gas heat exchanger, characterized in that: The device includes an elastic sealing device (2), which is installed on the flue gas heat exchanger. The elastic sealing device (2) is installed on the fan-shaped plates (3) at both ends of the flue gas side. The elastic sealing device (2) is adjusted online as the vertical position of the fan-shaped plates (3) changes. The elastic sealing device (2) includes a self-cleaning rotating shaft (4), an adjusting limit rod (5), a two-in-one sleeve (6), a spring (7), an elastic sealing plate (10), and a side plate (11). The spring (7) is fixedly installed inside the two-in-one sleeve (6), and one end of it extends to the outside of the two-in-one sleeve (6) and is hinged to the elastic sealing sheet (10). The other end is fixedly installed with an air inlet pipe, which is fixedly inserted through the top of the two-in-one sleeve (6). The adjusting limit rod (5) is fixedly installed on one side of the two-in-one sleeve (6), and one end of it is hinged to one end of the elastic sealing sheet (10). The position and height of the elastic sealing sheet (10) can be adjusted by adjusting the limiting rod (5). The side plate (11) is fixedly installed on the other side of the two-in-one sleeve (6), and one end of it is rotatably connected to one end of the elastic sealing sheet (10) through the self-cleaning shaft (4); The elastic sealing device (2) also includes a cooling air duct (8). The upper part of the two-in-one sleeve (6) is connected to the cooling air duct (8). Compressed air is introduced through the cooling air duct (8) and cooled and cleaned by the air inlet pipe. At the same time, the lower part of the two-in-one sleeve (6) is provided with a ventilation dust outlet hole (9). The compressed air inside the cooling air duct (8) blows the dust inside the two-in-one sleeve (6) so that the dust inside the two-in-one sleeve (6) is discharged in time through the ventilation dust outlet hole (9).
2. The sealing device for a rotary flue gas heat exchanger according to claim 1, characterized in that: The self-cleaning rotating shaft (4) consists of a rotating shaft and a rotating bushing. The rotating bushing is designed in an arc shape, and the end of the arc surface is designed in a sawtooth shape.
3. The sealing device for a rotary flue gas heat exchanger according to claim 1, characterized in that: The flue gas heat exchanger includes a rotor sealing plate (1), a sector plate (3) and a rotor (12). The length of the elastic sealing plate (10) is distributed in a gradient in the radial direction of the sector plate (3), gradually increasing from the center of the rotor (12) outward.
4. The sealing device for a rotary flue gas heat exchanger according to claim 3, characterized in that: The flue gas heat exchanger also includes a housing (13), inside which is provided a reinforced sealing device (14), which is located at the position of the sector plate (3) and keeps sealed to the rotor (12) in the radial direction.
5. The sealing device for a rotary flue gas heat exchanger according to claim 4, characterized in that: The enhanced sealing device (14) includes an airbag (15), which is fixedly installed inside the outer shell (13). The airbag (15) has two sides exposed outside the outer shell (13). One side faces the inner side of the outer shell (13) and is sealed to the rotor (12). The other side faces the direction of the fan-shaped plate (3) and is fixedly connected to a Y-shaped pipe (16). The two branch pipes of the Y-shaped pipe (16) are fixedly connected to the cylinder (17). A positioning spring (19) is fixedly installed in the middle of the cylinder (17). Pistons (18) are fixedly installed at both ends of the positioning spring (19). The pistons (18) and the cylinder (17) maintain a sliding seal connection.
6. The sealing device for a rotary flue gas heat exchanger according to claim 5, characterized in that: The airbag (15) is fixed in the inlay groove (22) inside the outer shell (13). The inlay groove (22) is connected to the two sides of the concave groove (20) for installing the Y-shaped pipe (16). One end of the concave groove (20) is connected to the inlay groove (22), and the other end is connected to the mounting groove (21) for installing the cylinder (17).
7. The sealing device for a rotary flue gas heat exchanger according to claim 4, characterized in that: A flue gas purification system is provided below the flue gas heat exchanger. The flue gas purification system includes a filter screen shell (23) fixedly installed at the bottom of the outer shell (13). The filter housing (23) is rotatably connected to a rotating shaft (25) and a first mesh cover (26), a second mesh cover (27), and a leaf plate (29) fixedly installed on the rotating shaft (25). The first mesh cover (26) is fixedly installed in the middle of the rotating shaft (25), and the second mesh cover (27) is axially symmetrically fixed to both ends of the rotating shaft (25) about the first mesh cover (26). An ionization module (28) is fixedly installed inside both the first mesh cover (26) and the second mesh cover (27). Multiple leaf plates (29) are provided. Leaf plates (29) are symmetrically installed on the rotating shaft (25), the first mesh cover (26) and the second mesh cover (27). When the multiple leaf plates (29) are unfolded, the overall plane forms an elliptical structure.
8. The sealing device for a rotary flue gas heat exchanger according to claim 7, characterized in that: The filter screen shell (23) has a multi-layer structure, from the outer layer to the inner layer, namely a grid plate (30), a primary filter plate (31) and a filter element plate (32). The grid plate (30) and the primary filter plate (31) are both set as a U-shaped structure, and the filter element plate (32) is wrapped in the middle layer.