An air preheater rotor deformation adaptive adjustment sealing system

Abstract

The present invention discloses an air preheater rotor deformation adaptive sealing system, which is arranged at the hot end of the rotor and includes a sealing plate assembly, a thermal deformation push rod, and a mating plate. The sealing plate assembly is arranged radially along the rotor, with its inner side rotatably connected to the rotor and its outer side flexibly connected to the rotor, so that the sealing plate assembly can rotate about its inner side and the rotor's rotation axis. The length of the thermal deformation push rod changes with changes in temperature. The thermal deformation push rod is arranged radially along the rotor, with its inner side rotatably connected to the rotor and its outer side connected to the mating plate, which is flexibly connected to the outer side of the sealing plate assembly and the rotor, respectively. When the thermal deformation push rod elongates due to rising temperature, it drives the sealing plate assembly to rotate relative to the rotor through the mating plate, causing the outer side of the sealing plate assembly to rise relative to the rotor. In other words, the sealing plate assembly can adaptively adjust with changes in rotor temperature, thereby maintaining the hot end radial sealing gap within a small range and reducing the direct air leakage rate in the hot end radial direction.

Description

Technical Field

[0001] The invention belongs to the technical field of rotary air preheaters, and in particular relates to an air preheater rotor deformation adaptive adjustment sealing system. Background Art

[0002] Air preheaters are essential equipment for large thermal power generation boiler systems. They absorb heat from flue gases to heat the air entering the furnace, achieving energy conservation and environmental protection. Improving the heat exchange efficiency of the air preheater can effectively increase the boiler's power generation efficiency. Reducing air leakage is a key component of improving air preheater efficiency. Reliable calculations show that every 1% increase in air preheater air leakage results in an increase in coal consumption of 0.06-0.08g / kWh. Air preheater leakage not only increases the power plant's coal consumption but also increases the plant's electricity consumption. This wastes significant energy and also leads to wear and tear within the air preheater, shortening its lifespan, and other drawbacks.

[0003] Air leakage in rotary heat exchangers is an inherent problem for this type of equipment. Air leakage typically consists of carryover and direct leakage. Carryover leakage occurs when air in the cavities between the rotor's heat transfer elements (accounting for 80-85% of the rotor's volume) is carried into the flue gas as the rotor rotates. The carryover rate is typically around 1.5-2%, and currently, there is no effective economical way to reduce this leakage other than to appropriately reduce the rotational speed. Direct leakage occurs when air, driven by the air-to-flue gas pressure differential, leaks through the gap between the rotor seal and the housing. Direct leakage generally accounts for the majority of air preheater leakage.

[0004] The most challenging issue in controlling direct air leakage in preheaters is how to accommodate rotor deformation caused by temperature differences between the upper and lower rotors. The preheater rotor deforms into a mushroom shape when heated. Axial and cold-end radial seals can be pre-configured to take advantage of this deformation. After the hot rotor deforms, the axial and cold-end seal gaps in the preheater are effectively eliminated. However, the hot-end radial seal gap is difficult to simply eliminate. Currently, the industry typically uses automatic air leakage control systems or spring-loaded flexible seals to control the hot-end seal gap. Automatic air leakage control systems have improved air preheater leakage to some extent, but they also introduce operational and maintenance issues such as hot-end system jamming, frequent sensor damage, lift rod dust leakage, and electronic control device failure, resulting in a low overall operational rate for the equipment. Spring-loaded flexible seals, on the other hand, have complex structures, short lifespans, and are expensive to replace as a set, making them uneconomical. The economic benefits of reducing air leakage are unlikely to offset the equipment investment. Summary of the Invention

[0005] The invention provides an air preheater rotor deformation self-adapting adjustment sealing system, which aims to reduce the radial direct air leakage rate of the hot end of the air preheater.

[0006] The technical solution of the present invention is:

[0007] An air preheater rotor deformation adaptive adjustment sealing system is provided at the hot end of the rotor, comprising:

[0008] A sealing plate assembly is arranged along the radial direction of the rotor, wherein the inner side of the sealing plate assembly is rotatably connected to the rotor and the outer side is movably connected to the rotor, so that the sealing plate assembly can rotate around the rotation axis of the inner side and the rotor;

[0009] A thermally deformable push rod, the length of which changes with temperature; the thermally deformable push rod is arranged along the radial direction of the rotor, the inner side of the thermally deformable push rod is rotatably connected to the rotor, and the outer side of the thermally deformable push rod is connected to a matching plate, and the matching plate is movably connected to the outer side of the sealing plate assembly and the rotor respectively;

[0010] When the thermally deformed push rod is extended due to temperature increase, the sealing plate assembly is driven to rotate relative to the rotor through the matching plate, so that the outer side of the sealing plate assembly is lifted relative to the rotor.

[0011] A certain embodiment provides an air preheater rotor deformation adaptive adjustment sealing system, wherein the sealing plate assembly includes a sealing plate and a bending reinforcement plate, the sealing plate, the bending reinforcement plate and the rotor are arranged side by side, and the bending reinforcement plate is arranged between the sealing plate and the rotor.

[0012] An air preheater rotor deformation adaptive adjustment sealing system provided in a certain embodiment also includes an elastic sealing pressure plate, which is arranged side by side and fixedly connected to the rotor; the interval between the elastic sealing pressure plate and the rotor is an accommodating interval, and the sealing plate assembly is arranged in the accommodating interval and rotates relative to the rotor in the accommodating interval.

[0013] An air preheater rotor deformation adaptive adjustment sealing system provided in one embodiment further includes an inner connecting portion, wherein the inner connecting portion includes:

[0014] An inner bushing, the two axial ends of which are respectively in contact with the elastic sealing pressure plate and the rotor, the sealing sheet and the anti-bending reinforcement plate are both sleeved on the inner bushing and can rotate around the inner bushing;

[0015] The inner fastener is passed through the elastic sealing pressure plate, the inner bushing and the rotor in sequence and then presses them together.

[0016] An air preheater rotor deformation adaptive adjustment sealing system provided in one embodiment further includes an outer connecting portion, the outer connecting portion including a gasket, an outer bushing, and an outer fastener, the sidewall of the outer bushing being in a three-stepped manner, including a first sidewall, a second sidewall, a third sidewall, a first step surface disposed between the first sidewall and the second sidewall and facing the rotor, and a second step surface disposed between the second sidewall and the third sidewall and facing the rotor;

[0017] The gasket, the matching plate, the elastic sealing pressure plate, the sealing sheet, the anti-bending reinforcement plate and the rotor are arranged side by side in sequence;

[0018] The rotor is sleeved on the first side wall, and the surface of the rotor facing the sealing plate assembly abuts against the first stepped surface. The anti-bending reinforcement plate, the sealing plate, and the elastic sealing pressure plate are sleeved on the second side wall. The matching plate is sleeved on the third side wall. The gasket abuts against the end surface of the outer bushing away from the rotor. The outer fastener passes through the gasket, the outer bushing, and the rotor in sequence and then presses them together.

[0019] The through holes on the anti-bending reinforcement plate and the sealing plate for the outer bushing to pass through are long holes, so as to enable the sealing plate assembly to rotate around its inner side and the rotation axis of the rotor.

[0020] A certain embodiment provides an air preheater rotor deformation adaptive adjustment sealing system, wherein the hot end side of the sealing plate is bent in the opposite direction of the rotor rotation direction; the sealing plate assembly includes a plurality of sealing plates, and the bending angles of different sealing plates are different and the bending angles are arranged in order of size.

[0021] In a certain embodiment, an air preheater rotor deformation adaptive adjustment sealing system is provided, wherein the cold end of the elastic sealing pressure plate is bent and abuts against the rotor after bending to form a line seal with the rotor.

[0022] In a certain embodiment, a rotor deformation adaptive adjustment sealing system for an air preheater is provided, wherein the mating plate is provided with a first long hole chute and a second long hole chute, respectively used for movably connecting with the sealing plate assembly and the rotor, and the first long hole chute is provided on the outside of the second long hole chute;

[0023] The sliding shaft connected to the sealing plate assembly is slidably connected in the first long hole chute, and the sliding shaft connected to the rotor is slidably connected in the second long hole chute.

[0024] In a certain embodiment, an air preheater rotor deformation adaptive adjustment sealing system is provided, wherein the first long hole slide groove and the second long hole slide groove are both inclined, the first long hole slide groove is gradually lowered toward the outside, and the second long hole slide groove is gradually raised toward the outside.

[0025] In a certain embodiment, an air preheater rotor deformation adaptive adjustment sealing system is provided, wherein the expansion coefficient of the thermal deformation push rod is greater than that of the rotor, and the trend of the thermal expansion coefficient of the thermal deformation push rod changing with temperature is smaller than that of the thermal expansion coefficient of the rotor changing with temperature.

[0026] Due to the adoption of the above technical solution, the present invention has the following advantages and positive effects compared with the prior art:

[0027] The present invention provides an adaptively adjustable air preheater rotor deformation sealing system. When the temperature rises, the thermally deformable push rods extend, driving the sealing plate assembly to rotate relative to the rotor via a mating plate, thereby raising the outer side of the sealing plate assembly relative to the rotor. In other words, the sealing plate assembly can adaptively adjust with rotor temperature, maintaining the hot-end radial sealing gap within a narrow range, thereby reducing the direct air leakage rate in the hot-end radial direction. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Various other advantages and benefits will become apparent to those skilled in the art by reading the following detailed description of the preferred embodiment.The accompanying drawings are only for the purpose of illustrating the preferred embodiment and are not to be considered as limiting the present invention.

[0029] Figure 1 This is a schematic diagram of the overall layout of the air preheater rotor deformation adaptive sealing system;

[0030] Figure 2 This is a three-dimensional installation diagram of the air preheater rotor deformation adaptive adjustment sealing system;

[0031] Figure 3 This is a cross-sectional diagram of the installation of the air preheater rotor deformation adaptive adjustment sealing system;

[0032] Figure 4 This is the engineering installation diagram of the air preheater rotor deformation adaptive sealing system;

[0033] Figure 5 It is a cross-sectional schematic diagram of the connection between the inner side of the sealing plate assembly and the rotating connection of the rotor;

[0034] Figure 6 This is a schematic diagram of the structure of the connection between the inner side of the thermally deformed push rod and the rotor;

[0035] Figure 7 It is a cross-sectional schematic diagram of the movable connection between the outer side of the sealing plate assembly and the rotor;

[0036] Figure 8 It is a cross-sectional schematic diagram of the movable connection between the outer side of the sealing plate assembly and the matching plate;

[0037] Figure 9 The structural diagram of the matching plate;

[0038] Figure 10 This is a schematic diagram of the air preheater rotor deformation adaptive adjustment sealing system at a certain moment after the thermal deformation push rod is deformed when it is put into hot use;

[0039] Figure 11 It is a cross-sectional schematic diagram of the connection between the inner side of the sealing plate assembly and the rotor rotation when multiple sealing plates are used;

[0040] Figure 12 Schematic diagram of welding of sealing sheet and bending reinforcement plate;

[0041] Figure 13 A comparison of the changes in the outer side of the sealing plate assembly and the rotor's movable connection before and after the rotor's mushroom-shaped deformation.

[0042] Description of reference numerals:

[0043] 1: Rotor; 2: Air preheater rotor deformation adaptive adjustment sealing system / system; 3: Sector plate; 4: Sealing plate assembly; 5: Articulated seat; 6: Thermal deformation push rod; 7: Compensation plate; 8: Elastic sealing pressure plate; 9: Sealing plate; 10: Anti-bending reinforcement plate; 11: Inner bushing; 12: Matching plate; 13: Outer bushing; 14: Sliding shaft (located in the first long hole slide); 15: First long hole slide; 16: Second long hole slide; 17: Inner connecting part. DETAILED DESCRIPTION

[0044] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific embodiments of the present invention will be described below with reference to the accompanying drawings. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings and other embodiments can be obtained based on these drawings without inventive work.

[0045] To simplify the drawings, only the parts relevant to the present invention are schematically shown in each figure. They do not represent the actual structure of the product. Furthermore, to simplify the drawings and facilitate understanding, in some figures, only one of the components with the same structure or function is schematically depicted or labeled. As used herein, "one" not only means "only one" but also "more than one."

[0046] In this document, along the radial direction of the rotor 1 , the side close to the rotation center of the rotor 1 is the inner side, and the opposite side is the outer side.

[0047] See Figures 1 to 13This embodiment provides an air preheater rotor deformation adaptive sealing system 2, located radially along the hot end of the rotor 1. The system comprises a sealing plate assembly 4, a thermally deformable push rod 6, and a mating plate 12. The sealing plate assembly 4 is radially disposed along the rotor 1, with its inner side pivotally connected to the rotor 1 and its outer side flexibly connected to the rotor 1, enabling the sealing plate assembly 4 to rotate about the rotational axis of the inner side and the rotor 1. The length of the thermally deformable push rod 6 changes with temperature. The thermally deformable push rod 6 is radially disposed along the rotor 1, with its inner side pivotally connected to the rotor 1 and its outer side connected to a mating plate 12, which flexibly connects the outer side of the sealing plate assembly 4 and the rotor 1, respectively. When the thermally deformable push rod 6 elongates due to rising temperature, it drives the sealing plate assembly 4 to rotate relative to the rotor 1 via the mating plate 12, causing the outer side of the sealing plate assembly 4 to rise relative to the rotor 1. In other words, the sealing plate assembly 4 can adaptively adjust with changes in the rotor 1 temperature, thereby maintaining the hot end radial sealing gap within a narrow range and reducing the direct air leakage rate in the hot end radial direction.

[0048] Specifically, the sealing sheet assembly 4 includes a sealing sheet 9 and an anti-bending reinforcement plate 10. The sealing sheet 9, the anti-bending reinforcement plate 10 and the rotor 1 are arranged side by side, and the anti-bending reinforcement plate 10 is arranged between the sealing sheet 9 and the rotor 1. The sealing sheet 9 can include a single channel or multiple channels. The sealing sheet 9 and the anti-bending reinforcement plate 10, and (when there are multiple channels of sealing sheets) the sealing sheets 9 and the sealing sheets 9 can be connected by welding at several locations, such as Figure 12 shown.

[0049] The hot end side of the sealing sheet 9 can be bent in the opposite direction of the rotation direction of the rotor 1. Preferably, the sealing sheet assembly 4 includes multiple sealing sheets 9, such as Figure 11 As shown, the bending angles of different sealing sheets 9 are different and the bending angles are arranged in order, thereby forming a labyrinth sealing effect and improving the overall sealing effect of the system 2.

[0050] The air preheater rotor deformation adaptive adjustment sealing system 2 also includes an elastic sealing pressure plate 8, which is arranged side by side and fixedly connected; the interval between the elastic sealing pressure plate 8 and the rotor 1 is an accommodating interval, and the sealing sheet assembly 4 is arranged in the accommodating interval and rotates relative to the rotor 1 in the accommodating interval.

[0051] Specifically, the inner side of the sealing plate assembly 4 is connected to the rotor 1 through the inner connecting portion 17, and the inner connecting portion 17 includes an inner bushing 11 and an inner fastener. Figure 5As shown, at the inner connection, the elastic sealing plate 8, sealing sheet 9, anti-bending reinforcement plate 10, and rotor 1 are arranged side by side in sequence. The axial ends of the inner bushing 11 respectively abut the elastic sealing plate 8 and rotor 1. The sealing sheet 9 and anti-bending reinforcement plate 10 are both sleeved on the inner bushing 11 and can rotate around it. The inner fasteners penetrate the elastic sealing plate 8, inner bushing 11, and rotor 1 in sequence and then tighten them together.

[0052] The outer side of the sealing plate assembly 4 is connected to the rotor 1 through the outer connecting portion, which includes a gasket, an outer bushing 13 and an outer fastener. Figure 7 As shown, at the outer connection, the gasket, mating plate 12, elastic sealing pressure plate 8, sealing plate 9, anti-bending reinforcement plate 10, and rotor 1 are arranged side by side in sequence. The sidewall of the outer bushing 13 is arranged in three steps, including a first sidewall, a second sidewall, a third sidewall, a first step surface located between the first and second sidewalls and facing the rotor 1, and a second step surface located between the second and third sidewalls and facing the rotor 1. The rotor 1 is mounted on the first sidewall, and the side of the rotor 1 facing the sealing plate assembly 4 abuts the first step surface. The anti-bending reinforcement plate 10, sealing plate 9, and elastic sealing pressure plate 8 are mounted on the second sidewall, and the mating plate 12 is mounted on the third sidewall. The gasket abuts the end surface of the outer bushing 13 facing away from the rotor 1. The outer fasteners are inserted through the gasket, outer bushing 13, and rotor 1 in sequence and then tightened. The through holes on the anti-bending reinforcement plate 10 and the sealing sheet 9 for the outer bushing 13 to penetrate are long holes, so that the sealing sheet assembly 4 can rotate around its inner side and the rotation axis of the rotor 1.

[0053] The width of the accommodation interval between the elastic sealing pressure plate 8 and the rotor 1, that is, the distance between the elastic sealing pressure plate 8 and the rotor 1, is slightly larger than the thickness of the sealing plate assembly 4, so that the sealing plate assembly 4 can be installed more stably in the accommodation interval and can rotate in the accommodation interval (around the rotation axis of the inner side of the sealing plate assembly 4 and the rotor 1).

[0054] Preferably, the cold end of the elastic sealing plate 8 is bent and abuts against the rotor 1 after the bend, forming a line seal with the rotor 1. Specifically, the bent portion of the elastic sealing plate 8 will produce a slight elastic deformation after installation, applying a pre-tightening force to the rotor 1, thereby forming a line seal pair at this location to prevent air leakage.

[0055] The sealing plate assembly 4 can rotate in a small range with the inner side and the rotation axis of the rotor 1 as the rotation center, thereby achieving the effect of lifting the outer sealing plate 9. Figure 4As shown, compensation plates 7 are provided on the innermost and outermost sides of the sealing plate assembly 4 near the rotation center of the rotor 1. The compensation plates 7 on both sides are located on both sides of the two connections between the sealing plate 4 and the rotor 1. At the positions where the compensation plates 7 are provided, no elastic sealing pressure plates 8 are provided. The compensation plates 7 and the sealing plates 9 are tightly attached to form a surface sealing pair, which is used to compensate for the air leakage gap caused by the action of the sealing plate assembly 4. The gap-filling plates are welded and fixed to the rotor 1.

[0056] Please refer to Figure 9 The mating plate 12 is provided with a first slotted slot 15 and a second slotted slot 16, respectively, for flexible connection with the sealing plate assembly 4 and the rotor 1. The first slotted slot 15 is located outside the second slotted slot 16. A sliding shaft connected to the rotor 1 slides and rotates within the second slotted slot 16, thereby converting the length change of the thermally deformed push rod 6 into a rotational motion of the outer side of the thermally deformed push rod 6 and the mating plate 12 (the rotational axis of the rotational motion is the inner side of the thermally deformed push rod 6 and the rotational axis of the rotor 1). The sliding shaft 14 connected to the sealing plate assembly 4 slides and rotates within the first slotted slot 15, thereby converting the aforementioned rotational motion into rotational motion of the sealing plate assembly 4 (the rotational axis of the rotational motion is the inner side of the sealing plate assembly 4 and the rotational axis of the rotor 1). This ultimately controls the lifting of the outermost sealing plate 9, compensating for the additional air leakage gap caused by the mushroom-shaped deformation of the rotor 1, and thus providing adaptive sealing adjustment.

[0057] Specifically in this embodiment, Figure 9 As shown, the first long hole chute 15 and the second long hole chute 16 are both inclined, the first long hole chute 15 is gradually lowered toward the outside, and the second long hole chute 16 is gradually raised toward the outside. Figure 10 As shown, in order to avoid the sliding shaft 14 connected to the sealing sheet assembly 4 and slidably connected to the first long hole sliding groove 15, the elastic sealing pressure plate 8 can be designed into two sections and disconnected at the sliding shaft 14.

[0058] The heat-deformed push rod 6 is located on the side of the sealing plate assembly 4 and the elastic sealing pressure plate 8 away from the rotor 1. Its inner side is hinged to the rotor 1 via the hinge seat 5, and its outer side is fixedly connected to the matching plate 12. Figure 6 The inner side of the heat-deformed push rod 6 is provided with a hinge hole, which is rotatably hinged with the hinge seat 5. The hinge seat 5 and the rotor 1 are respectively provided with mounting holes, and the fasteners are respectively passed through the mounting holes on the hinge seat 5 and the rotor 1 to achieve a fastening connection between the two; wherein, the mounting hole on the hinge seat 5 is slightly larger than the mounting hole on the rotor 1, so that fine adjustment can be made, so that the inner side of the heat-deformed push rod 6 can be installed in the appropriate position of the rotor 1. Please refer to Figure 9A sleeve is fixedly connected to the mating plate 12, and the thermally deformable push rod 6 extends into the sleeve. The outer side of the thermally deformable push rod 6 is provided with an external thread, which is threadedly connected to two nuts. The two nuts are respectively located on either side of the sleeve to clamp the sleeve, thereby achieving a fixed connection between the thermally deformable push rod 6 and the mating plate 12. By adjusting the position of the two nuts on both sides of the sleeve, the relative position of the thermally deformable push rod 6 and the mating plate 12 can be adjusted, thereby adjusting the initial position of the radial outer side of the sealing plate assembly 4.

[0059] The thermal deformation push rod 6 has a greater coefficient of expansion than the rotor 1, and the thermal expansion coefficient of the thermal deformation push rod 6 has a smaller temperature variation trend than the thermal expansion coefficient of the rotor 1. Specifically, the thermal deformation push rod 6 includes an inner core rod and an outer sleeve. The inner core rod is made of a material with a high coefficient of expansion, and the outer sleeve is made of a wear-resistant material. Several ventilation holes are provided on the outer sleeve to prevent the outer sleeve from blocking heat conduction. The outer sleeve is disconnected at the middle of the thermal deformation push rod 6 and then welded to the inner core rod near the middle to form a whole. The hinge hole on the inner side of the thermal deformation push rod 6 and the hinge seat 5 is made of a wear-resistant material. There is no limitation on the specific implementation method. For example, a through hole can be provided on the inner side of the inner core rod, and the through hole can be made of a wear-resistant layer made of a wear-resistant material, and the wear-resistant layer forms the hinge hole. Among them, both the inner core rod and the outer sleeve can be made of metal.

[0060] During hot operation of the air preheater, the temperature at the hot end of the rotor 1 rises, causing the rotor 1 to deform in a downward, mushroom-like shape. The amount of deformation is linearly related to the hot-end temperature. When the air preheater is in operation, the heat-deformed push rod 6 at the hot end of the air preheater expands and contracts in its length as the ambient temperature changes. The amount of expansion depends on the thermal expansion coefficient of the core material within the heat-deformed push rod 6. Considering the economic and safety considerations of the air preheater, the core material selected has a thermal expansion coefficient that varies less with temperature than that of the rotor 1 material. Furthermore, by varying the relative angle and distance between the two slotted slots (first slot 15 and second slot 16) on the mating plate 12, the lift height of the sealing plate 9 of the system 2 can be adjusted at different temperatures, enabling the air preheater rotor deformation adaptive sealing system 2 to adapt to air preheaters of varying sizes and models.

[0061] The sealing plate assembly 4 will be as follows when in action Figure 4 、 Figure 10 and Figure 13As shown in the figure, the rotation around the inner side of the sealing plate assembly 4 and the rotation axis of the rotor 1 can compensate for the additional air leakage gap caused by the mushroom-shaped deformation of the rotor 1, thus providing an adaptive seal adjustment function. Considering the safety of the unit operation, the appropriate core rod material is selected so that the thermal expansion tendency of the heat-deformed push rod 6 is appropriately reduced as the temperature rises, thereby preventing the system 2 and the sector plate 3 from scraping and affecting the unit operation, thereby ensuring the safe operation of the unit.

[0062] The air preheater rotor deformation adaptive adjustment sealing system 2 provided in this embodiment has at least the following advantages:

[0063] (1) System 2 is simple and does not require the installation of electrical control equipment. It can automatically adjust the size of the radial air leakage gap at the hot end of the air preheater to reduce the air leakage rate. The air leakage control effect is close to that of the traditional automatic air leakage control system.

[0064] (2) Daily maintenance workload is small. Since system 2 has no electrical control equipment, manual control operation is not required. During operation, the air leakage gap can be appropriately enlarged as the boiler load increases. The sealing plate 9 will not increase the operating resistance of the air preheater due to friction with the sector plate 3, thereby improving the safety and reliability of the entire system 2.

[0065] (3) System 2 has a fast response speed. Since system 2 uses the expansion characteristics of the material to control the system action, the expansion amount is only related to the ambient temperature of the material. The expansion and the mushroom-shaped deformation of rotor 1 are synchronized, and the action responds in real time.

[0066] (4) Good economy, simple structure, easy processing, low production cost, and short investment recovery period of System 2.

[0067] (5) Compact integrated design, small space occupation, strong adaptability, and easy installation and disassembly. The sealing plate assembly 4 adopts an integrated design, eliminating the trouble of traditional sealing plates being installed in sections and requiring on-site disassembly and installation, making maintenance more convenient. At the same time, the sealing plate assembly 4, the thermal deformation push rod 6, and the matching plate 12 all adopt a compact design. The system 2 occupies less space, has stronger equipment adaptability, and can be flexibly installed without on-site modifications.

[0068] (6) Flexible adjustment. When the unit needs to change its operating conditions, the parameter changes of the unit can be adapted by adjusting the relative position of the thermally deformed push rod 6 and the matching plate 12, replacing the matching plate 12, etc.

[0069] (7) Long service life of the equipment. Since System 2 has no electrical control components, only the hinged parts (or rotating parts) may be subject to wear and tear, and the calculated service life can exceed 3 overhaul cycles.

[0070] (8) System 2 has a wide range of applications. The sealing plate assembly 4 can adopt various sealing forms to adapt to the requirements of different air preheater models.

[0071] (9) System 2 has good adaptability. The matching plate 12 can be adjusted according to different unit designs to change the magnification factor (i.e., the relative angle and distance between the first long hole chute 15 and the second long hole chute 16).

[0072] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, if these changes fall within the scope of the claims of the present invention and their equivalents, they still fall within the scope of protection of the present invention.

Claims

1. An air preheater rotor deformation adaptive adjustment sealing system, characterized in that: Located at the hot end of the rotor, it includes: A sealing plate assembly is arranged along the radial direction of the rotor, wherein the inner side of the sealing plate assembly is rotatably connected to the rotor and the outer side is movably connected to the rotor, so that the sealing plate assembly can rotate around the rotation axis of the inner side and the rotor; A thermally deformable push rod, the length of which changes with temperature; the thermally deformable push rod is arranged along the radial direction of the rotor, the inner side of the thermally deformable push rod is rotatably connected to the rotor, and the outer side of the thermally deformable push rod is connected to a matching plate, and the matching plate is movably connected to the outer side of the sealing plate assembly and the rotor respectively; When the thermally deformed push rod is extended due to temperature increase, the sealing plate assembly is driven to rotate relative to the rotor through the matching plate, so that the outer side of the sealing plate assembly is lifted relative to the rotor; The mating plate is provided with a first long hole chute and a second long hole chute, which are respectively used to be movably connected to the sealing plate assembly and the rotor, and the first long hole chute is provided on the outside of the second long hole chute; the sliding shaft connected to the sealing plate assembly is slidably connected to the first long hole chute, and the sliding shaft connected to the rotor is slidably connected to the second long hole chute; The first long hole chute and the second long hole chute are both inclined, the first long hole chute is gradually lowered toward the outside, and the second long hole chute is gradually raised toward the outside; The expansion coefficient of the thermally deformable push rod is greater than that of the rotor, and the trend of the thermal expansion coefficient of the thermally deformable push rod changing with temperature is smaller than that of the thermal expansion coefficient of the rotor changing with temperature.

2. The air preheater rotor deformation adaptive adjustment sealing system according to claim 1 is characterized in that: The sealing sheet assembly includes a sealing sheet and an anti-bending reinforcement plate. The sealing sheet, the anti-bending reinforcement plate and the rotor are arranged side by side, and the anti-bending reinforcement plate is arranged between the sealing sheet and the rotor.

3. The air preheater rotor deformation adaptive adjustment sealing system according to claim 2 is characterized in that: It also includes an elastic sealing pressure plate, which is arranged side by side with the rotor and fixedly connected; the interval between the elastic sealing pressure plate and the rotor is an accommodating interval, and the sealing sheet assembly is arranged in the accommodating interval and rotates relative to the rotor in the accommodating interval.

4. The air preheater rotor deformation adaptive adjustment sealing system according to claim 3 is characterized in that: Also included is an inner connecting portion, the inner connecting portion comprising: An inner bushing, the two axial ends of which are respectively in contact with the elastic sealing pressure plate and the rotor, the sealing sheet and the anti-bending reinforcement plate are both sleeved on the inner bushing and can rotate around the inner bushing; The inner fastener is passed through the elastic sealing pressure plate, the inner bushing and the rotor in sequence and then presses them together.

5. The air preheater rotor deformation adaptive adjustment sealing system according to claim 3 is characterized in that: The outer connecting portion includes a gasket, an outer bushing, and an outer fastener. The side wall of the outer bushing is stepped in three sections, including a first side wall, a second side wall, a third side wall, a first step surface disposed between the first side wall and the second side wall and facing the rotor, and a second step surface disposed between the second side wall and the third side wall and facing the rotor. The gasket, the matching plate, the elastic sealing pressure plate, the sealing sheet, the anti-bending reinforcement plate and the rotor are arranged side by side in sequence; The rotor is sleeved on the first side wall, and the surface of the rotor facing the sealing plate assembly abuts against the first stepped surface. The anti-bending reinforcement plate, the sealing plate, and the elastic sealing pressure plate are sleeved on the second side wall. The matching plate is sleeved on the third side wall. The gasket abuts against the end surface of the outer bushing away from the rotor. The outer fastener passes through the gasket, the outer bushing, and the rotor in sequence and then presses them together. The through holes on the anti-bending reinforcement plate and the sealing plate for the outer bushing to pass through are long holes, so as to enable the sealing plate assembly to rotate around its inner side and the rotation axis of the rotor.

6. The air preheater rotor deformation adaptive adjustment sealing system according to claim 2, characterized in that: One side of the hot end of the sealing sheet is bent in the opposite direction of the rotor rotation direction; the sealing sheet assembly includes a plurality of sealing sheets, and the bending angles of different sealing sheets are different and the bending angles are arranged in order.

7. The air preheater rotor deformation adaptive adjustment sealing system according to claim 3 is characterized in that: One side of the cold end of the elastic sealing pressure plate is bent, and after being bent, it abuts against the rotor to form a line seal with the rotor.

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