A non-contact flexible sealing structure for rotary air preheater

Abstract

The present invention relates to the field of rotary air preheaters, and discloses a non-contact flexible sealing structure for rotary air preheaters. Through the invention, a new rotor radial sealing structure is provided that can ensure the sealing effect while avoiding component damage, that is, non-contact sealing components are respectively provided on the upper / lower edges of the rotor radial partition, and the non-contact sealing components include radial rigid beams, rollers, elastic parts and radial sealing sheets. Through their combined relationship, the radial sealing sheet can maintain a constant distance from the fan-shaped plate when passing through the space between the upper and lower fan-shaped plates together with the rotor radial partition, ensuring that there is always a gap such as 0.5 mm, thereby having a high sealing performance and truly achieving the purpose of non-contact sealing of the upper / lower edges, avoiding the situation where the radial sealing sheet and the fan-shaped plate wear each other, and can respectively increase the service life of both.

Description

Technical Field

[0001] The invention relates to the field of rotary air preheaters, and in particular to a non-contact flexible sealing structure for rotary air preheaters. Background Art

[0002] The rotary air preheater is a flue gas and air heat exchange equipment mainly used in thermal power plants. It generally has the following forms: two-compartment air preheater - the heating surface of this type of air preheater is divided into two compartments, namely the air compartment and the flue gas compartment; three-compartment air preheater - the heating surface of this type of air preheater is divided into three compartments, namely the primary air compartment, the secondary air compartment and the flue gas compartment; four-compartment air preheater - the heating surface of this type of air preheater is divided into four compartments, namely two secondary air compartments, one primary air compartment and one flue gas compartment.

[0003] The rotary air preheater has different compartments, through which flue gas, primary air and secondary air pass respectively. Its working principle is: the heating surface in each compartment is driven to rotate by rotation, and the heat in the flue gas is transferred to the heating surface through flue gas, primary air and secondary air respectively. When the heating surface rotates to the primary air and secondary air compartments, the heating surface transfers the heat to the primary air and secondary air, thus completing the heat exchange from flue gas to primary air and secondary air. Due to the different pressures of flue gas, primary air and secondary air, there is a radial flue gas leakage problem from the primary air and secondary air on the high-pressure side to the low-pressure side, which will cause part of the air that should have entered the boiler for combustion to "short-circuit" in the air preheater and be directly discharged from the flue gas into the atmosphere, which in turn causes the capacity of the primary fan, secondary fan and induced draft fan to increase, which increases the power consumption of these fans and wastes electric energy. Especially in the hot state, the rotor will become mushroom-shaped, that is, in the high temperature state, the rigidity of the radial partition plate will be reduced, which will cause the outer side of the radial partition plate to deform downward due to its own weight, and a triangular air leakage area will appear between the radial partition plate and the fan plate, making the radial air leakage at the hot end more serious.

[0004] In order to alleviate the radial air leakage problem of the rotary air preheater, a variety of anti-leakage structures are currently used, but the following problems still exist:

[0005] (1) With long-term operation, the rotor horizontality of the air preheater of some old units may seriously exceed the design value due to various reasons (such as fire, bearings, etc.), and the cause cannot be solved by rotor alignment. When installing traditional sealing plates on this type of air preheater, the radial sealing gap at the cold end must be enlarged, which leads to more air leakage at the cold end, lowers the exhaust gas temperature, reduces the overall temperature of the cold end, and aggravates the formation of ammonium bisulfate at the cold end, causing serious ash blockage in the heat storage element of the air preheater; and when the heat storage element of the air preheater is blocked by ash, the power consumption of the three major fans will increase, the pressure difference between the air side and the flue gas side will increase, and the air leakage of the air preheater will be further increased, eventually forming a vicious circle. In severe cases, it will affect the load of the unit and must be solved by shutting down and cleaning the air preheater.

[0006] (2) Flexible seals currently on the market mainly reduce the wear of the seal by improving the wear resistance of the material, but this inevitably increases the wear of the fan plate, causing irreparable damage to the fan plate bottom plate after a long period of operation; at the same time, because the fan plate bottom plate is worn unevenly, the wear of the seal is aggravated, forming an inevitable vicious cycle. The problem can only be solved by replacing the fan plate, but the workload and cost of replacing the fan plate are relatively high.

[0007] (3) Currently, all flexible seals on the market are swing-type, with the central axis of the swing hinge "parallel" to the radial partition surface and "vertical" to the contact direction of the fan plate. This means that for each rotation of the three-compartment air preheater, the swing hinge of a single set of seals must collide with the fan plate at least six times under "ideal conditions", causing the swing hinge to swing six times. However, in actual air preheaters, the rotor always has a horizontal deviation, and the surface of the fan plate is worn and uneven, so the swing hinge will swing very frequently, far more than six times. After a long period of operation, it is easy to produce a large clearance; at the same time, it reduces the life of the elastic element and affects the sealing performance.

[0008] (4) Some sealing structures currently on the market require a long time to install and a large amount of installation work, requiring the sector plates, arc plates and all sealing structures to be replaced.

[0009] (5) When the flexible seal is running in cold state, it needs to reserve elastic recovery in cold state to make up for the air leakage gap, which will cause relatively large wear on the fan plate. Especially for 1000MW units, the rotor diameter of the air preheater generally exceeds 17500mm. The radial seal length on the rotor radial partition generally exceeds 7500mm, and when the rotor is thermally deformed in mushroom shape, the outermost air leakage gap of the rotor exceeds 50mm. Therefore, if the elastic recovery reserve of the sealing piece exceeds 50mm. Since the time from the boiler being shut down to the boiler being completely cooled down is very long, the air preheater must keep rotating before the boiler is completely cooled down. The thermal deformation of the rotor of the air preheater slowly changes from 50 to 0mm. At this time, the sealing piece of the air preheater will cause irreversible wear on the fan plate. Summary of the invention

[0010] In order to solve the problems of easy damage of sealing components and poor sealing effect in various radial sealing methods in rotary air preheaters, the present invention aims to provide a non-contact flexible sealing structure for a rotary air preheater.

[0011] The technical solution adopted by the present invention is:

[0012] A non-contact flexible sealing structure for a rotary air preheater, comprising a rotor central tube, a hot end fan-shaped plate, a cold end fan-shaped plate and a rotor radial partition plate, wherein the hot end fan-shaped plate and the cold end fan-shaped plate are respectively located at the periphery of the rotor central tube and are coaxially arranged with the rotor central tube, and the hot end fan-shaped plate and the cold end fan-shaped plate are arranged opposite to each other up and down, and the rotor radial partition plate is fixedly connected to the rotor central tube and passes through the space between the hot end fan-shaped plate and the cold end fan-shaped plate during rotation;

[0013] The radial starting end of the upper edge of the rotor radial partition is movably hinged to the first end of the first radial rigid beam, the second end of the first radial rigid beam is rotatably connected to the first roller through a bearing, the radial end of the upper edge of the rotor radial partition is fixedly connected to the first end of the first elastic member, the second end of the first radial rigid beam is also fixedly connected to the second end of the first elastic member, the first roller can roll with the bottom surface of the hot end fan plate when passing through the space between the hot end fan plate and the cold end fan plate together with the rotor radial partition, and a first radial sealing sheet is provided above the first radial rigid beam, the upper edge of the first radial sealing sheet is parallel to the axis of the first roller, and the parallel spacing is smaller than the radius of the first roller;

[0014] And / or, the radial starting end of the lower edge of the rotor radial baffle is movably hinged to the first end of the second radial rigid beam, the second end of the second radial rigid beam is rotatably connected to the second roller through a bearing, the radial end of the lower edge of the rotor radial baffle is fixedly connected to the first end of the second elastic member, the second end of the second radial rigid beam is also fixedly connected to the second end of the second elastic member, the second roller can roll in contact with the top surface of the cold end fan plate when passing through the space between the hot end fan plate and the cold end fan plate together with the rotor radial baffle, and a second radial sealing plate is provided below the second radial rigid beam, the lower edge of the second radial sealing plate is parallel to the axial center line of the second roller and the parallel spacing is smaller than the radius of the second roller.

[0015] The optimization further includes an arc-shaped plate, wherein the arc-shaped plate is located at the periphery of the hot end sector plate and the cold end sector plate and is coaxially arranged with the rotor center tube;

[0016] The upper and lower ends of the outer edges of the rotor radial partition are respectively fixedly connected to the first ends of two third elastic members, and the second ends of the two third elastic members are respectively fixedly connected to the upper and lower ends of the same vertical rigid rod. The upper and lower ends of the vertical rigid rod are also rotatably connected to a third roller through bearings. When the third roller rotates with the rotor radial partition, it can roll in contact with the inner wall surface of the arc plate, and a vertical sealing plate is provided on the radial outer side of the vertical rigid rod. The radial outer edge of the vertical sealing plate is parallel to the axial center line of the third roller and the parallel spacing is smaller than the radius of the third roller.

[0017] For further optimization, third roller buffer plates capable of rolling contact with the third roller are respectively provided at both circumferential ends of the arc plate.

[0018] Optimally, when a first roller is included, first roller buffer plates capable of rolling contact with the first roller are respectively provided at both circumferential ends of the hot end sector plate;

[0019] When a second roller is included, second roller buffer plates capable of rolling contact with the second roller are respectively provided at both circumferential ends of the cold end sector plate.

[0020] Optimally, smoke guide plates are provided at both circumferential ends of the hot end fan-shaped plate or the cold end fan-shaped plate.

[0021] Optimally, when a first radial rigid beam is included, a buffer mounting plate is also provided on the upper edge of the rotor radial partition, wherein the lower area of ​​the buffer mounting plate is fixedly connected to the rotor radial partition in parallel, and the upper area of ​​the buffer mounting plate extends upward from the upper edge of the rotor radial partition and is embedded with a buffer pad that can slide in contact with the side of the first radial rigid beam.

[0022] Optimized, when including a first radial rigid beam, the radial starting end of the upper edge of the rotor radial partition is movably hinged to the first end of the first radial rigid beam through a hinge seat, wherein the hinge seat includes a vertical connecting plate, a transverse connecting plate and a vertical hinged plate, the vertical connecting plate is detachably connected to the rotor radial partition in parallel and the top end is fixedly connected to one end of the transverse connecting plate, the other end of the transverse connecting plate is fixedly connected to the bottom end of the vertical hinged plate, the vertical hinged plate is movably hinged to the first end of the first radial rigid beam, and the hinged end of the first radial rigid beam is limited in the space surrounded by the plane of the vertical connecting plate, the transverse connecting plate and the vertical hinged plate.

[0023] Optimized, when including a first radial rigid beam and a first elastic member, the radial end of the upper edge of the rotor radial partition is fixedly connected to the first end of the first elastic member through a guide support plate, wherein the guide support plate includes a vertical fixing plate, a transverse support plate and a vertical limiting plate, the vertical fixing plate is detachably connected to the rotor radial partition in parallel and the top end is fixedly connected to one end of the transverse support plate, the other end of the transverse support plate is fixedly connected to the bottom end of the vertical limiting plate and the upper surface is fixedly connected to the first end of the first elastic member, and the first elastic member and the elastic member connection end of the first radial rigid beam are limited in the space surrounded by the plane of the vertical fixing plate, the transverse support plate and the vertical limiting plate.

[0024] Optimally, a pressure plate and a radial sealing plate are further provided on the upper edge of the rotor radial partition, wherein the lower area of ​​the pressure plate and the lower area of ​​the radial sealing plate are respectively and detachably connected to the rotor radial partition in parallel, the upper area of ​​the pressure plate extends upward from the upper edge of the rotor radial partition, and the radial sealing plate is clamped between the rotor radial partition and the pressure plate and the upper area extends upward from the upper edge of the pressure plate.

[0025] Optimally, when a first radial rigid beam is included, the first radial rigid beam is a hollow rectangular steel tube;

[0026] and / or, when a first roller is included, the first roller is a stainless steel wheel;

[0027] And / or, when a first elastic member is included, the first elastic member is a stainless steel spring;

[0028] And / or, when a first radial sealing sheet is included, an upper edge region of the first radial sealing sheet is inclined toward the counter-rotation direction.

[0029] The beneficial effects of the present invention are:

[0030] (1) The present invention provides a novel rotor radial sealing structure that can ensure the sealing effect while avoiding component damage, that is, non-contact sealing components are respectively provided on the upper / lower edges of the rotor radial partition, and the non-contact sealing components include radial rigid beams, rollers, elastic members and radial sealing sheets. Through their combination, the radial sealing sheets can maintain a constant distance from the fan-shaped plates when passing through the space between the upper and lower fan-shaped plates together with the rotor radial partition, ensuring that there is always a gap of 0.5 mm, thereby having a high sealing performance and truly achieving the purpose of non-contact sealing of the upper / lower edges, avoiding the mutual wear between the radial sealing sheets and the fan-shaped plates, and respectively improving the service life of both.

[0031] (2) By providing a non-contact sealing component on the outer edge of the rotor radial partition, the purpose of non-contact sealing of the outer edge can also be achieved, further improving the radial sealing effect without damaging the component;

[0032] (3) It can be applied to any rotary air preheater, especially the rotary air preheater with seriously exceeded rotor horizontality, and can still reduce the air leakage rate of the air preheater a lot;

[0033] (4) It is conducive to product modularization and simple installation. There is no need to make additional adjustments to the fan-shaped plate, and there is no need to set up installation scales. Under the premise of ensuring the installation quality, the construction difficulty and workload of the project are greatly reduced. In practice, the entire installation cycle is about 2 days, which greatly shortens the installation cycle;

[0034] (5) Since the sealing principle is relatively simple, the dependence on the sealing sheet material is not high. Conventional wear-resistant and corrosion-resistant materials are used, so the cost is very low. In addition, the effect after the transformation is good and the duration is long, which can ensure that the air leakage rate of the air preheater remains stable within an overhaul period;

[0035] (6) The non-contact flexible sealing structure also has the advantages of stable operation, reliable hinge, convenient modification, simple structure and easy implementation, which is convenient for practical application and promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0037] Figure 1 It is a schematic diagram of the rotor lateral structure of the non-contact flexible sealing structure provided by the present invention.

[0038] Figure 2 It is a schematic diagram of the radial structure of the rotor of the non-contact flexible sealing structure provided by the present invention.

[0039] Figure 3 The figure is a schematic diagram of the rotor top view of the non-contact flexible sealing structure provided by the present invention.

[0040] Figure 4 It is a schematic diagram of the AA cross section of various operating conditions in the rotor transverse structure provided by the present invention.

[0041] Figure 5 It is a BB cross-sectional schematic diagram of various operating conditions in the rotor transverse structure provided by the present invention.

[0042] Figure 6 It is a CC cross-sectional schematic diagram of various operating conditions in the rotor transverse structure provided by the present invention.

[0043] In the above drawings: 1-rotor center tube; 2-hot end sector plate; 3-cold end sector plate; 4-rotor radial partition; 51-first radial rigid beam; 52-second radial rigid beam; 53-vertical rigid rod; 61-first roller; 62-second roller; 63-third roller; 71-first elastic member; 72-second elastic member; 73-third elastic member; 81-first radial sealing sheet; 82-second radial sealing sheet; 83-vertical sealing sheet; 91 -first roller buffer plate; 92-second roller buffer plate; 93-third roller buffer plate; 10-smoke guide plate; 11-arc plate; 12-buffer mounting plate; 13-buffer pad; 14-hinge seat; 141-vertical connecting plate; 142-transverse connecting plate; 143-vertical hinge plate; 15-guide support plate; 151-vertical fixing plate; 152-transverse support plate; 153-vertical limit plate; 16-pressure plate; 17-radial sealing plate. DETAILED DESCRIPTION

[0044] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. It should be noted that although the description of these embodiments is used to help understand the present invention, it does not constitute a limitation of the present invention. The specific structures and functional details disclosed herein are only used to describe the exemplary embodiments of the present invention. However, the present invention can be embodied in many alternative forms, and it should not be understood that the present invention is limited to the embodiments set forth herein.

[0045] It should be understood that although the terms first, second, etc. may be used herein to describe various units, these units should not be limited by these terms. These terms are only used to distinguish one unit from another unit. For example, a first unit can be referred to as a second unit, and similarly, a second unit can be referred to as a first unit without departing from the scope of the exemplary embodiments of the present invention.

[0046] It should be understood that the term "and / or" that may appear in this article is merely a description of the association relationship between associated objects, indicating that three relationships may exist. For example, A and / or B can represent three situations: A exists alone, B exists alone, and A and B exist at the same time. The term " / and" that may appear in this article describes another type of association object relationship, indicating that two relationships may exist. For example, A / and B can represent two situations: A exists alone, and A and B exist alone. In addition, the character " / " that may appear in this article generally indicates that the previous and next associated objects are in an "or" relationship.

[0047] It should be understood that when an element is referred to herein as being "connected," "connected," or "coupled" to another element, it can be directly connected or coupled to the other element, or intermediate elements can exist. Conversely, when an element is referred to herein as being "directly connected" or "directly coupled" to another element, no intermediate elements are present. Additionally, other words used to describe the relationship between elements (e.g., "between" versus "directly between," "adjacent" versus "directly adjacent," etc.) should be interpreted in a similar manner.

[0048] It should be understood that the terms used herein are only used to describe specific embodiments and are not intended to limit the exemplary embodiments of the present invention. As used herein, the singular forms "a", "an", and "the" are intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that when the terms "include", "comprises", "includes", and / or "comprising" are used herein, they specify the existence of the claimed features, integers, steps, operations, units, and / or components, and do not exclude the existence or addition of one or more other features, quantities, steps, operations, units, components, and / or their combinations.

[0049] It should be understood and also noted that in some alternative embodiments, the functions / actions that appear may be different from the order in which the figures appear. For example, depending on the functions / actions involved, two figures shown in succession may actually be performed substantially concurrently, or may sometimes be performed in the reverse order.

[0050] It should be understood that in the following description, specific details are provided to facilitate a complete understanding of the example embodiments. However, it should be understood by those of ordinary skill in the art that the example embodiments can be implemented without these specific details. For example, the system can be shown in a block diagram to avoid obscuring the example with unnecessary details. In other examples, well-known processes, structures, and techniques may not be shown in unnecessary detail to avoid obscuring the example embodiments.

[0051] Embodiment 1

[0052] like Figures 1 to 6 As shown, the non-contact flexible sealing structure for a rotary air preheater provided in this embodiment includes a rotor central tube 1, a hot end fan-shaped plate 2, a cold end fan-shaped plate 3 and a rotor radial partition 4, wherein the hot end fan-shaped plate 2 and the cold end fan-shaped plate 3 are respectively located at the periphery of the rotor central tube 1 and are coaxially arranged with the rotor central tube 1, and the hot end fan-shaped plate 2 and the cold end fan-shaped plate 3 are arranged opposite to each other up and down, and the rotor radial partition 4 is fixedly connected to the rotor central tube 1 and passes through the space between the hot end fan-shaped plate 2 and the cold end fan-shaped plate 3 during rotation.

[0053] The radial starting end of the upper edge of the rotor radial partition 4 is movably hinged to the first end of the first radial rigid beam 51, the second end of the first radial rigid beam 51 is rotatably connected to the first roller 61 through a bearing, the radial end of the upper edge of the rotor radial partition 4 is fixedly connected to the first end of the first elastic member 71, the second end of the first radial rigid beam 51 is also fixedly connected to the second end of the first elastic member 71, the first roller 61 can roll with the bottom surface of the hot end sector plate 2 when passing through the space between the hot end sector plate 2 and the cold end sector plate 3 together with the rotor radial partition 4, and a first radial sealing sheet 81 is provided above the first radial rigid beam 51, the upper edge of the first radial sealing sheet 81 is parallel to the axis of the first roller 61 and the parallel spacing is smaller than the radius of the first roller 61; and / Or, the radial starting end of the lower edge of the rotor radial partition 4 is movably hinged to the first end of the second radial rigid beam 52, the second end of the second radial rigid beam 52 is rotatably connected to the second roller 62 through a bearing, the radial end of the lower edge of the rotor radial partition 4 is fixedly connected to the first end of the second elastic member 72, the second end of the second radial rigid beam 52 is also fixedly connected to the second end of the second elastic member 72, the second roller 62 can roll with the top surface of the cold end fan plate 3 when passing through the space between the hot end fan plate 2 and the cold end fan plate 3 together with the rotor radial partition 4, and a second radial sealing plate 82 is provided below the second radial rigid beam 52, the lower edge of the second radial sealing plate 82 is parallel to the axial center line of the second roller 62 and the parallel spacing is smaller than the radius of the second roller 62.

[0054] like Figures 1 to 6 As shown, in the specific structure of the non-contact flexible sealing structure, the rotor central tube 1, the hot end fan plate 2, the cold end fan plate 3 and the rotor radial partition plate 4 are all conventional components in the existing rotary air preheater and have the conventional combination relationship mentioned above. Figure 1 and 2As shown, non-contact sealing components (i.e., including radial rigid beams, rollers, elastic parts and radial sealing sheets) corresponding to the hot end sector plates 2 and the cold end sector plates 3 are respectively provided on the upper edge and the lower edge of the rotor radial partition plate 4.

[0055] In the non-contact sealing assembly corresponding to the hot end fan plate 2, since the first end of the first radial rigid beam 51 is movably hinged to the radial starting end of the upper edge of the rotor radial partition 4, a hinged center axis can be formed with a rotation range perpendicular to the rotor radial partition 4, so that the second end of the first radial rigid beam 51 can move freely up and down. At the same time, since the first elastic member 71 is provided between the second end of the first radial rigid beam 51 and the radial end of the upper edge of the rotor radial partition 4, under the compression and reset action of the first elastic member 71 (the elastic member is in a compressed reset state due to gravity and the squeezing force from the hot end fan plate 2 when passing through the space between the hot end fan plate 2 and the cold end fan plate 3), the first roller 61 can roll in contact with the bottom surface of the hot end fan plate 2 when passing through the space between the hot end fan plate 2 and the cold end fan plate 3 together with the rotor radial partition 4, forming a rolling amplitude with a rolling center axis parallel to the rotor radial partition 4. Even if various rotor horizontal deviations occur on the upper edge of the rotor radial partition 4 (such as a small lift or drop, etc.), the horizontal position of the first roller 61 can be maintained by adaptively adjusting the deformation length of the first elastic member 71, so that the first roller 61 always rolls in contact with the bottom surface of the hot end fan plate 2 when passing. Figure 4As shown. Since the upper edge of the first radial sealing sheet 81 is parallel to the axis of the first roller 61 and the parallel spacing is smaller than the radius of the first roller 61, the upper edge of the first radial sealing sheet 81 keeps a constant distance from the bottom surface of the hot end sector plate 2 (because the horizontal position of the first roller 61 remains unchanged) when passing through the space between the hot end sector plate 2 and the cold end sector plate 3 together with the rotor radial partition plate 4, so that it can be ensured that there is always a gap such as 0.5mm, and thus it can have a high sealing performance and truly achieve the purpose of non-contact sealing of the upper edge, avoiding the mutual wear of the first radial sealing sheet 81 and the hot end sector plate 2, respectively, and can respectively increase the service life of both, and can reduce the dependence on the sealing sheet material, and conventional wear-resistant and corrosion-resistant materials can be used, and the cost is very low. Since the main wear will come from the first roller 61, the first roller 61 can be preferably a stainless steel wheel with extremely high wear resistance, and at the same time, the wear can be further reduced by reducing the dynamic friction coefficient of the roller. In addition, the first radial rigid beam 51 may preferably be a hollow rectangular steel tube; the first elastic member 71 may preferably be a stainless steel spring; the upper edge area of ​​the first radial sealing sheet 81 is preferably inclined in the reverse rotation direction, such as Figure 4 As shown, it can follow the airflow and prevent deformation.

[0056] In the non-contact sealing assembly corresponding to the cold end fan plate 3, based on the similar principle mentioned above: since the first end of the second radial rigid beam 52 is movably hinged at the radial starting end of the lower edge of the rotor radial partition 4, a hinged center axis can be formed with a rotation range perpendicular to the rotor radial partition 4, so that the second end of the second radial rigid beam 52 can move freely up and down. At the same time, since the second elastic member 72 is provided between the second end of the second radial rigid beam 52 and the radial end of the lower edge of the rotor radial partition 4, the second elastic member 72 can be extended (the elastic member is in an extended state due to gravity) so that the second roller 62 can roll in contact with the top surface of the cold end fan plate 3 when passing through the space between the hot end fan plate 2 and the cold end fan plate 3 together with the rotor radial partition 4, forming a rolling amplitude with a rolling center axis parallel to the rotor radial partition 4. Even if various rotor horizontality deviations occur at the lower edge of the rotor radial partition 4 (such as a small lift or drop, etc.), the deformation length of the second elastic member 72 can be adaptively adjusted to maintain the horizontal position of the second roller 62, so that the second roller 62 is always in rolling contact with the top surface of the cold end fan plate 3 when passing. Furthermore, since the lower edge of the second radial sealing sheet 82 is parallel to the axis of the second roller 62 and the parallel spacing is smaller than the radius of the second roller 62, the lower edge of the second radial sealing sheet 82 maintains a constant distance from the top surface of the cold end fan-shaped plate 3 when passing through the space between the hot end fan-shaped plate 2 and the cold end fan-shaped plate 3 together with the rotor radial partition plate 4 (because the horizontal position of the second roller 62 remains unchanged), so that it can be ensured that there is always a gap such as 0.5mm, and thus it can have a very high sealing performance and truly achieve the purpose of non-contact sealing of the lower edge, avoiding the mutual wear of the second radial sealing sheet 82 and the cold end fan-shaped plate 3, respectively improving the service life of both, and reducing the dependence on the sealing sheet material, and conventional wear-resistant and corrosion-resistant materials can be used, and the cost is very low. Since the main wear will come from the second roller 62, the second roller 62 can be preferably a stainless steel wheel with extremely high wear resistance, and at the same time, the wear can be further reduced by reducing the roller dynamic friction coefficient. In addition, the second radial rigid beam 52 may also be preferably a hollow rectangular steel tube; the second elastic member 72 may also be preferably a stainless steel spring; the upper edge area of ​​the second radial sealing sheet 82 may also be preferably inclined in the reverse rotation direction, so as to conform to the airflow and prevent deformation.

[0057] Therefore, through the detailed description of the aforementioned non-contact flexible sealing structure, a new rotor radial sealing structure for a rotary air preheater is provided, which can ensure the sealing effect while avoiding component damage, that is, non-contact sealing components are respectively provided on the upper / lower edges of the rotor radial partition, and the non-contact sealing components include a radial rigid beam, a roller, an elastic member and a radial sealing sheet. Through their combination, the radial sealing sheet can maintain a constant distance from the fan plate when passing through the space between the upper and lower fan plates together with the rotor radial partition, ensuring that there is always a gap of such as 0.5 mm, thereby having high sealing performance and truly achieving the purpose of non-contact sealing of the upper / lower edges, avoiding mutual wear between the radial sealing sheet and the fan plate, and can respectively increase the service life of both.

[0058] The optimization also includes an arc plate 11, wherein the arc plate 11 is located at the periphery of the hot end fan plate 2 and the cold end fan plate 3 and is coaxially arranged with the rotor center tube 1; the upper and lower ends of the outer edge of the rotor radial partition 4 are respectively fixedly connected to the first ends of two third elastic members 73, and the second ends of the two third elastic members 73 are respectively fixedly connected to the upper and lower ends of the same vertical rigid rod 53, and the upper and lower ends of the vertical rigid rod 53 are also respectively connected to a third roller 63 through bearings, and the third roller 63 can roll with the inner wall surface of the arc plate 11 when rotating with the rotor radial partition 4, and a vertical sealing plate 83 is provided on the radial outer side of the vertical rigid rod 53, and the radial outer edge of the vertical sealing plate 83 is parallel to the axial center line of the third roller 63 and the parallel spacing is smaller than the radius of the third roller 63.

[0059] like Figure 1 and 3As shown, the arc plate 11 is also a conventional component in the existing rotary air preheater and has the conventional combination relationship mentioned above, and a non-contact sealing component corresponding to the arc plate 11 is also provided on the outer edge of the rotor radial partition 4. In the non-contact sealing component corresponding to the arc plate 11, since the vertical rigid rod 53 is provided with the third elastic member 73 at the upper and lower ends respectively, under the compression and reset action of the third elastic member 73 (because the elastic member is in a compressed and reset state due to the squeezing force from the arc plate 11 when passing through the space between the hot end sector plate 2 and the cold end sector plate 3), the third rollers 63 (the two rollers are of the same size) at the upper and lower ends can pass through the space between the hot end sector plate 2 and the cold end sector plate 3 together with the rotor radial partition 4. When the space between the hot-end fan-shaped plate 2 and the cold-end fan-shaped plate 3 is formed, it can roll in contact with the inner wall surface of the arc plate 11 to form a rolling width with a rolling center axis parallel to the rotor radial partition 4. Even if various gap deviations occur between the outer edge of the rotor radial partition 4 and the inner wall surface of the arc plate 11, the radial position of the third roller 63 can be maintained by adaptively adjusting the deformation length of the third elastic member 73, so that the third roller 63 is always in rolling contact with the inner wall surface of the arc plate 11 when passing by. At the same time, since the radial outer edge of the vertical sealing sheet 83 is parallel to the axis of the third roller 63 and the parallel spacing is smaller than the radius of the third roller 63, the radial outer edge of the third radial sealing sheet 83 keeps a constant distance from the inner wall surface of the arc plate 11 when passing through the space between the hot end sector plate 2 and the cold end sector plate 3 together with the rotor radial partition plate 4 (because the radial position of the third roller 61 remains unchanged), so that it can be ensured that there is always a gap such as 0.5mm, and then it can have a high sealing performance and truly achieve the purpose of non-contact sealing of the outer edge, avoiding the mutual wear of the third radial sealing sheet 83 and the arc plate 11, respectively improving the service life of both, and reducing the dependence on the sealing sheet material, and conventional wear-resistant and corrosion-resistant materials can be used, and the cost is very low. Since the main wear will come from the third roller 63, the third roller 63 can also be preferably a stainless steel wheel with extremely high wear resistance, and at the same time, the wear can be further reduced by reducing the roller dynamic friction coefficient. In addition, the vertical rigid rod 53 may also be preferably a hollow rectangular steel tube; the third elastic member 73 may also be preferably a stainless steel spring; the outer edge area of ​​the third radial sealing sheet 83 is preferably inclined in the reverse rotation direction, and may also conform to the airflow to prevent deformation.

[0060] Further optimized, the arc plate 11 is provided with a third roller buffer plate 93 at both ends of the arc plate 11, which can roll in contact with the third roller 63. Figure 1 and 3As shown, by providing the third roller buffer plate 93, it can be ensured that the third elastic member 73 can smoothly change from the natural state to the compressed state when entering the space between the hot end fan plate 2 and the cold end fan plate 3, and can smoothly change from the compressed state to the natural state when exiting the space between the hot end fan plate 2 and the cold end fan plate 3, thereby reducing the operating resistance and improving the smoothness of the operation.

[0061] Optimally, when a first roller 61 is included, first roller buffer plates 91 capable of rolling contact with the first roller 61 are respectively provided at both ends of the hot end sector plate 2 in the circumferential direction; and when a second roller 62 is included, second roller buffer plates 92 capable of rolling contact with the second roller 62 are respectively provided at both ends of the cold end sector plate 3 in the circumferential direction. Figure 1 and 2 As shown, similarly, by setting up these two roller buffer plates, it can also be ensured that the corresponding elastic member can smoothly change from the natural state to the compressed state when entering the space between the hot end fan plate 2 and the cold end fan plate 3, and can smoothly change from the compressed state to the natural state when exiting the space between the hot end fan plate 2 and the cold end fan plate 3, thereby reducing the operating resistance and improving the smoothness of the operation.

[0062] Optimally, a smoke guide plate 10 is provided at both ends of the hot end fan plate 2 or the cold end fan plate 3. Figure 2 As shown, by setting the smoke guide plate 10, the smoke flow direction can also be regulated at the corresponding end.

[0063] Optimally, when the first radial rigid beam 51 is included, a buffer mounting plate 12 is further provided on the upper edge of the rotor radial partition 4, wherein the lower region of the buffer mounting plate 12 is fixedly connected to the rotor radial partition 4 in parallel, and the upper region of the buffer mounting plate 12 extends upward from the upper edge of the rotor radial partition 4 and is embedded with a buffer pad 13 that can slide in contact with the side of the first radial rigid beam 51. Figure 4 and 5 As shown, the design of the aforementioned buffer structure can prevent the non-contact seal assembly from excessive vibration during the rotation of the rotor, further ensuring the stability of operation. Similarly, a similar buffer structure can also be designed for the second radial rigid beam 52 and / or the vertical rigid beam 53, which will not be described in detail here.

[0064] Optimized, when including a first radial rigid beam 51, the radial starting end of the upper edge of the rotor radial partition 4 is movably hinged to the first end of the first radial rigid beam 51 through a hinge seat 14, wherein the hinge seat 14 includes a vertical connecting plate 141, a transverse connecting plate 142 and a vertical hinged plate 143, the vertical connecting plate 141 is detachably connected to the rotor radial partition 4 in parallel and the top end is fixedly connected to one end of the transverse connecting plate 142, the other end of the transverse connecting plate 142 is fixedly connected to the bottom end of the vertical hinged plate 143, the vertical hinged plate 143 is movably hinged to the first end of the first radial rigid beam 51, and the hinged end of the first radial rigid beam 51 is limited in the space surrounded by the plane of the vertical connecting plate 141, the transverse connecting plate 142 and the vertical hinged plate 143. Figure 6 As shown, through the specific design of the hinge seat 14, the rotor rotation mode of the first radial rigid beam 51 and the hinge seat 14 can be "parallel" to the contact direction of the hot end sector plate 2, achieving a better force-bearing mode and greatly improving the reliability of the hinge. Similarly, a similar hinge seat structure can also be designed for the second radial rigid beam 52 and / or the vertical rigid beam 53, which will not be described in detail here.

[0065] Optimized, when including a first radial rigid beam 51 and a first elastic member 71, the radial end of the upper edge of the rotor radial partition 4 is fixedly connected to the first end of the first elastic member 71 through a guide support plate 15, wherein the guide support plate 15 includes a vertical fixing plate 151, a transverse support plate 152 and a vertical limiting plate 153, the vertical fixing plate 151 is detachably connected to the rotor radial partition 4 in parallel and the top end is fixedly connected to one end of the transverse support plate 152, the other end of the transverse support plate 152 is fixedly connected to the bottom end of the vertical limiting plate 153 and the upper surface is fixedly connected to the first end of the first elastic member 71, and the first elastic member 71 and the elastic member connection end of the first radial rigid beam 51 are limited in the space surrounded by the plane of the vertical fixing plate 151, the transverse support plate 152 and the vertical limiting plate 153. Figure 4 As shown, through the specific design of the aforementioned guide support plate 15, the first radial rigid beam 51 can be effectively limited during the rotation of the rotor to ensure the normal operation of the non-contact sealing assembly. Similarly, a similar guide support structure can also be designed for the second radial rigid beam 52 and / or the vertical rigid beam 53, which will not be described in detail here.

[0066] Optimally, a pressure plate 16 and a radial sealing plate 17 are further provided on the upper edge of the rotor radial partition 4, wherein the lower region of the pressure plate 16 and the lower region of the radial sealing plate 17 are respectively and detachably connected to the rotor radial partition 4 in parallel, the upper region of the pressure plate 16 extends upwardly from the upper edge of the rotor radial partition 4, and the radial sealing plate 17 is clamped between the rotor radial partition 4 and the pressure plate 16, and the upper region extends upwardly from the upper edge of the pressure plate 16. Figures 4 to 6 As shown, the design of the pressure plate 16 and the radial sealing plate 17 can provide a primary non-contact sealing effect and achieve a double sealing purpose. Similarly, a similar primary non-contact sealing structure can also be designed for the lower edge and / or outer edge of the rotor radial partition 4, which will not be described in detail here.

[0067] In summary, the non-contact flexible sealing structure for a rotary air preheater provided in this embodiment has the following technical effects:

[0068] (1) This embodiment provides a novel rotor radial sealing structure that can ensure the sealing effect while avoiding component damage, that is, non-contact sealing components are respectively provided on the upper / lower edges of the rotor radial partition, and the non-contact sealing components include radial rigid beams, rollers, elastic members and radial sealing sheets. Through their combination, the radial sealing sheets can maintain a constant distance from the fan-shaped plates when passing through the space between the upper and lower fan-shaped plates together with the rotor radial partition, ensuring that there is always a gap of 0.5 mm, thereby having a high sealing performance and truly achieving the purpose of non-contact sealing of the upper / lower edges, avoiding the mutual wear between the radial sealing sheets and the fan-shaped plates, and respectively improving the service life of both.

[0069] (2) By providing a non-contact sealing component on the outer edge of the rotor radial partition, the purpose of non-contact sealing of the outer edge can also be achieved, further improving the radial sealing effect without damaging the component;

[0070] (3) It can be applied to any rotary air preheater, especially the rotary air preheater with seriously exceeded rotor horizontality, and can still reduce the air leakage rate of the air preheater a lot;

[0071] (4) It is conducive to product modularization and simple installation. There is no need to make additional adjustments to the fan-shaped plate, and there is no need to set up installation scales. Under the premise of ensuring the installation quality, the construction difficulty and workload of the project are greatly reduced. In practice, the entire installation cycle is about 2 days, which greatly shortens the installation cycle;

[0072] (5) Since the sealing principle is relatively simple, the dependence on the sealing sheet material is not high. Conventional wear-resistant and corrosion-resistant materials are used, so the cost is very low. In addition, the effect after the transformation is good and the duration is long, which can ensure that the air leakage rate of the air preheater remains stable within an overhaul period;

[0073] (6) The non-contact flexible sealing structure also has the advantages of stable operation, reliable hinge, convenient modification, simple structure and easy implementation, which is convenient for practical application and promotion.

[0074] The multiple embodiments described above are merely illustrative. If a unit described as a separate component is involved, it may or may not be physically separated; if a component displayed as a unit is involved, it may or may not be a physical unit, that is, it may be located in one place, or it may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0075] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention is described in detail with reference to the above embodiments, a person skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some of the technical features can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

[0076] Finally, it should be noted that the present invention is not limited to the above optional implementations, and anyone can derive other various forms of products under the enlightenment of the present invention. The above specific implementations should not be understood as limiting the scope of protection of the present invention. The scope of protection of the present invention should be based on the definition in the claims, and the description can be used to interpret the claims.

Claims

1. A non-contact flexible sealing structure for a rotary air preheater, characterized in that: The invention comprises a rotor central tube (1), a hot end sector plate (2), a cold end sector plate (3), a rotor radial partition plate (4) and an arc plate (11), wherein the hot end sector plate (2) and the cold end sector plate (3) are respectively located at the periphery of the rotor central tube (1) and are coaxially arranged with the rotor central tube (1), and the hot end sector plate (2) and the cold end sector plate (3) are arranged opposite to each other up and down, the rotor radial partition plate (4) is fixedly connected to the rotor central tube (1) and passes through the space between the hot end sector plate (2) and the cold end sector plate (3) during rotation, and the arc plate (11) is located at the periphery of the hot end sector plate (2) and the cold end sector plate (3) and is coaxially arranged with the rotor central tube (1); The radial starting end of the upper edge of the rotor radial partition (4) is movably hinged to the first end of the first radial rigid beam (51), the second end of the first radial rigid beam (51) is rotatably connected to the first roller (61) via a bearing, the radial end of the upper edge of the rotor radial partition (4) is fixedly connected to the first end of the first elastic member (71), the second end of the first radial rigid beam (51) is also fixedly connected to the second end of the first elastic member (71), the first roller (61) can roll with the bottom surface of the hot end sector plate (2) when passing through the space between the hot end sector plate (2) and the cold end sector plate (3) together with the rotor radial partition (4), and a first radial sealing sheet (81) is provided above the first radial rigid beam (51), the upper edge of the first radial sealing sheet (81) is parallel to the axis of the first roller (61) and the parallel spacing is smaller than the radius of the first roller (61); and / Alternatively, the radial starting end of the lower edge of the rotor radial partition (4) is movably hinged to the first end of the second radial rigid beam (52), the second end of the second radial rigid beam (52) is rotatably connected to the second roller (62) via a bearing, the radial end of the lower edge of the rotor radial partition (4) is fixedly connected to the first end of the second elastic member (72), the second end of the second radial rigid beam (52) is also fixedly connected to the second end of the second elastic member (72), the second roller (62) can roll with the top surface of the cold end fan-shaped plate (3) when passing through the space between the hot end fan-shaped plate (2) and the cold end fan-shaped plate (3) together with the rotor radial partition (4), and a second radial sealing sheet (82) is provided below the second radial rigid beam (52), the lower edge of the second radial sealing sheet (82) is parallel to the axis of the second roller (62) and the parallel spacing is smaller than the radius of the second roller (62); The upper and lower ends of the outer edges of the rotor radial partition (4) are respectively fixedly connected to the first ends of two third elastic members (73); the second ends of the two third elastic members (73) are respectively fixedly connected to the upper and lower ends of the same vertical rigid rod (53); the upper and lower ends of the vertical rigid rod (53) are also respectively rotatably connected to a third roller (63) via bearings; the third roller (63) can roll in contact with the inner wall surface of the arc plate (11) when rotating with the rotor radial partition (4); and a vertical sealing sheet (83) is provided on the radial outer side of the vertical rigid rod (53); the radial outer edge of the vertical sealing sheet (83) is parallel to the axis of the third roller (63) and the parallel spacing is smaller than the radius of the third roller (63); Smoke guide plates (10) are also provided at both circumferential ends of the hot end sector plate (2) or the cold end sector plate (3), respectively.

2. A non-contact flexible sealing structure for a rotary air preheater according to claim 1, characterized in that: Third roller buffer plates (93) capable of rolling contact with the third roller (63) are respectively provided at both circumferential ends of the arc-shaped plate (11).

3. A non-contact flexible sealing structure for a rotary air preheater according to claim 1, characterized in that: When the first roller (61) is included, first roller buffer plates (91) capable of rolling contact with the first roller (61) are respectively provided at both circumferential ends of the hot end sector plate (2); When a second roller (62) is included, second roller buffer plates (92) capable of rolling contact with the second roller (62) are respectively provided at both circumferential ends of the cold end sector plate (3).

4. A non-contact flexible sealing structure for a rotary air preheater according to claim 1, characterized in that: When a first radial rigid beam (51) is included, a buffer mounting plate (12) is also provided on the upper edge of the rotor radial partition (4), wherein the lower region of the buffer mounting plate (12) is fixedly connected to the rotor radial partition (4) in parallel, and the upper region of the buffer mounting plate (12) extends upward from the upper edge of the rotor radial partition (4) and is embedded with a buffer pad (13) that can slide in contact with the side of the first radial rigid beam (51).

5. A non-contact flexible sealing structure for a rotary air preheater according to claim 1, characterized in that: When a first radial rigid beam (51) is included, the radial starting end of the upper edge of the rotor radial partition (4) is movably hinged to the first end of the first radial rigid beam (51) through a hinge seat (14), wherein the hinge seat (14) includes a vertical connecting plate (141), a transverse connecting plate (142) and a vertical hinged plate (143), wherein the vertical connecting plate (141) is detachably connected to the rotor radial partition (4) in parallel and the top end is fixedly connected to one end of the transverse connecting plate (142), and the other end of the transverse connecting plate (142) is fixedly connected to the bottom end of the vertical hinged plate (143), and the vertical hinged plate (143) is movably hinged to the first end of the first radial rigid beam (51), and the hinged end of the first radial rigid beam (51) is limited in a space surrounded by the plane where the vertical connecting plate (141) is located, the transverse connecting plate (142) and the vertical hinged plate (143).

6. A non-contact flexible sealing structure for a rotary air preheater according to claim 1, characterized in that: When a first radial rigid beam (51) and a first elastic member (71) are included, the radial end of the upper edge of the rotor radial partition (4) is fixedly connected to the first end of the first elastic member (71) via a guide support plate (15), wherein the guide support plate (15) comprises a vertical fixing plate (151), a transverse support plate (152) and a vertical limiting plate (153), wherein the vertical fixing plate (151) is detachably connected to the rotor radial partition (4) in parallel and the top end is fixedly connected to one end of the transverse support plate (152), the other end of the transverse support plate (152) is fixedly connected to the bottom end of the vertical limiting plate (153) and the upper surface is fixedly connected to the first end of the first elastic member (71), and the first elastic member (71) and the elastic member connection end of the first radial rigid beam (51) are limited in a space surrounded by the plane where the vertical fixing plate (151) is located, the transverse support plate (152) and the vertical limiting plate (153).

7. A non-contact flexible sealing structure for a rotary air preheater according to claim 1, characterized in that: A pressure plate (16) and a radial sealing plate (17) are also provided on the upper edge of the rotor radial partition (4), wherein the lower region of the pressure plate (16) and the lower region of the radial sealing plate (17) are respectively and detachably connected to the rotor radial partition (4) in parallel, the upper region of the pressure plate (16) extends upwardly from the upper edge of the rotor radial partition (4), and the radial sealing plate (17) is clamped between the rotor radial partition (4) and the pressure plate (16), and the upper region extends upwardly from the upper edge of the pressure plate (16).

8. A non-contact flexible sealing structure for a rotary air preheater according to claim 1, characterized in that: When a first radial rigid beam (51) is included, the first radial rigid beam (51) is a hollow rectangular steel tube; and / or, when a first roller (61) is included, the first roller (61) is a stainless steel wheel; And / or, when the first elastic member (71) is included, the first elastic member (71) is a stainless steel spring; And / or, when a first radial sealing sheet (81) is included, an upper edge region of the first radial sealing sheet (81) is inclined in the reverse rotation direction.

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