Ash removal device of air preheater

Abstract

The invention relates to an air preheater ash removal device which comprises a first rail (1) and a second rail (2), two transverse support assemblies (3) are arranged on the upper side of the first rail (1) and the upper side of the second rail (2) in parallel, the transverse support assemblies (3) move along the first rail (1) and the second rail (2), and a connecting frame (4) is connected between the two transverse support assemblies (3); vertical vibration devices (5) are arranged on the upper sides of the two transverse ends of the transverse support assembly (3) respectively, the vertical vibration devices (5) are connected with a main shaft (6), and a plurality of toothed plates (7) are arranged on the main shaft (6) at intervals; the middle of the transverse support assembly (3) is connected with an adapter plate (8), and the adapter plate (8) is connected with a horizontal driving device (9) used for driving the transverse support assembly (3) to move along the first track (1) and the second track (2). The ash removal device of the air preheater is good in ash removal effect.

Description

Technical Field

[0001] The invention belongs to the technical field of dust cleaning, and in particular relates to a dust cleaning device for an air preheater. Background Art

[0002] In order to improve the thermal efficiency of the boiler and reduce the heat loss of flue gas, an air preheater is usually installed at the rear of the boiler. When the air preheater is working, ash will accumulate on its surface. The ash is mostly a mixture of various components such as ammonium bisulfate and dust particles. It has a certain viscosity and will hinder the flow of flue gas. Therefore, it is necessary to use a cleaning device to clean the air preheater. The existing cleaning device includes a driving device and a cleaning comb plate connected to the driving device. The driving device drives the cleaning comb plate to move horizontally between the heat exchange tubes of the air preheater for cleaning. However, since the ash has a certain viscosity, when the comb plate moves horizontally between the heat exchange tubes to clean the ash, the mixture will adhere to the comb plate and be carried to the end, resulting in ash accumulation on the tube plates at both ends of the air preheater, thereby causing the stroke range of the comb plate to be gradually compressed and unable to operate continuously for a long period of time.

[0003] In addition, the existing drive mode uses a motor drive. When the comb plate is blocked during dust cleaning, it will continue to output power, which will cause burning. Or it is necessary to set a shutdown protection when the above situation occurs, and the motor can only be restarted after the furnace is stopped for dust cleaning. Summary of the invention

[0004] The object of the present invention is to solve the above-mentioned problem and provide an air preheater dust cleaning device.

[0005] To achieve the above object, the present invention provides an air preheater dust cleaning device, comprising a first track and a second track, wherein two transverse bracket assemblies are provided on the upper sides of the first track and the second track in parallel with each other, the transverse bracket assemblies move along the first track and the second track, and a connecting frame is connected between the two transverse bracket assemblies;

[0006] The upper sides of the two lateral ends of the lateral support assembly are respectively provided with vertical vibration devices, the vertical vibration devices are connected to a main shaft, and a plurality of tooth plates are spaced apart on the main shaft;

[0007] An adapter plate is connected to the middle of the transverse support assembly, and the adapter plate is connected to a horizontal driving device for driving the transverse support assembly to move along the first track and the second track.

[0008] According to one aspect of the present invention, the transverse bracket assembly includes a first transverse bracket and a second transverse bracket arranged at intervals, a clamping plate fixedly connected to the first transverse bracket and the second transverse bracket, and a support baffle located between the first transverse bracket and the second transverse bracket, wherein a spindle limiting hole is provided on the support baffle;

[0009] The first transverse bracket and the second transverse bracket are connected to a support seat, the clamping plate and the upper side of the support seat are fixedly connected to a mounting seat, and the vertical vibration device is mounted on the mounting seat.

[0010] According to one aspect of the present invention, the vertical vibration device comprises an air oscillator mounted on the mounting seat, the air oscillator having a vibration piston rod, a moving block is connected to the lower part of the vibration piston rod, the main shaft passes through the moving block, and a return spring is connected to the lower side of the moving block;

[0011] The support seat comprises a bottom plate, and the other end of the return spring is located on the bottom plate and connected to the bottom plate.

[0012] According to one aspect of the present invention, the moving block comprises an upper moving block and a lower moving block which are arranged opposite to each other, and the upper moving block and the lower moving block are provided with semicircular arc surfaces which cooperate with the main shaft;

[0013] The return spring is connected to the lower moving block, and the lower moving block is also connected to a guide column, and the return spring is located at the periphery of the guide column;

[0014] The bottom plate is provided with a circular hole, and the guide column passes through the circular hole.

[0015] According to one aspect of the present invention, the clamping plate is also connected to an air conduit, and the air conduit is connected to the air oscillator through an air pipe.

[0016] According to one aspect of the present invention, the connecting frame includes a first connecting frame and a second connecting frame arranged parallel to each other in a horizontal direction, the first connecting frame and the second connecting frame are fixedly connected to the card plate, and the first connecting frame and the second connecting frame are vertically arranged with the first transverse bracket and the second transverse bracket;

[0017] A reinforcing bracket is also provided between the second transverse bracket and the second connecting bracket;

[0018] The first connecting frame, the second connecting frame and the air conduit are arranged opposite to each other on both sides of the card plate;

[0019] The lower side of the second connecting frame is connected to a roller, the roller is provided with a track baffle, and the clamping plate is also connected to an anti-dropping plate.

[0020] According to one aspect of the present invention, the horizontal driving device comprises a cylinder and a push rod fixedly connected to the cylinder;

[0021] The air preheater further comprises a through-wall sealing assembly, and the push rod passes through the through-wall sealing assembly and is connected to the adapter plate.

[0022] According to one aspect of the present invention, the wall sealing assembly comprises a main structure and a flange pressing piece connected to the main structure;

[0023] A heat-insulating cotton layer is arranged inside the main structure.

[0024] According to one aspect of the present invention, the horizontal drive device further comprises cylinder supports arranged opposite to each other, and the cylinder supports are provided with adjustment holes;

[0025] The front end of the cylinder is connected to a fixing plate, and the fixing plate is provided with an adjusting shaft that matches the adjusting hole.

[0026] According to one aspect of the present invention, the tooth plate has a self-cleaning function, and comprises a plate body and a sawtooth structure arranged on the plate body, and the sawtooth structures of the cleaning tooth plates at the two transverse bracket assemblies are arranged in opposite directions.

[0027] The air preheater cleaning device of the present invention can drive the adapter plate and the transverse support assembly to move along the first track and the second track through the operation of the horizontal device. Since the connecting frame connects the two groups of transverse support assemblies together, the two groups of transverse support assemblies can be moved synchronously along the first track and the second track, so that the tooth plate can be translated between the air preheater tubes to achieve the cleaning operation. At the same time, due to the setting of the vertical vibration device, the tooth plate can be driven to reciprocate up and down, and the tooth plate can be reciprocated from top to bottom in the gap between the heat exchange tubes, cutting and shaking off the sticky or compacted dust on the heat exchange tubes, and the dust accumulated on the tube plates at both ends of the air preheater can also be cleaned.

[0028] The air preheater dust cleaning device of the present invention has an air path interface on the top of the air oscillator, and compressed air is input through the air pipe. The front end of the air path is connected to the air path interface of the air path conduit, which is a metal hard pipe. The air path conduit passes through the wall sealing component on the flue wall of the boiler and is connected to the card plate. The air path interface of the air path conduit is connected to the output port of the electromagnetic control valve, and the input port of the electromagnetic control valve is connected to the external compressed air source. The electromagnetic control valve controls the air oscillator to rush out and retract. When the electromagnetic control valve is opened, the compressed air enters the pressure chamber of the air oscillator through the pipeline, overcomes the magnetic force of the magnet and instantly explodes to push the vibration piston rod of the air oscillator. When the electromagnetic control valve is closed, the compressed air entering the pressure chamber of the air oscillator returns to the atmosphere through the pipeline, and the vibration piston rod of the air oscillator retracts and resets under the action of the internal spring. The vibration frequency of the air oscillator is controlled by the control valve. When the vibration piston rod of the air oscillator rushes downward, the moving block and the main shaft move downward, and the reset spring is compressed. When the vibration piston rod of the air oscillator retracts upward, the reset spring pushes the moving block and the main shaft to return to their original positions. In this way, the air vibrator vibrates over and over again, driving the main shaft to reciprocate up and down, thereby enabling the tooth plate to reciprocate from top to bottom in the gap between the heat exchange tubes, cutting and shaking off the sticky or hardened dust on the heat exchange tubes.

[0029] The air preheater tooth plate of the present invention is vertically arranged between adjacent heat exchange tubes, and the direction of flue gas flow is from top to bottom. Since the angle between the first inclined tooth surface and the tooth top surface is 33°-35°, and the angle between the second inclined tooth surface and the tooth top surface is greater than the angle between the first inclined tooth surface and the tooth top surface, and the arc surface is arranged to connect the second inclined tooth surface and the first inclined tooth surface of the adjacent sawtooth structure, when the flue gas passes from top to bottom, the space surrounded by the second inclined tooth surface, the arc surface and the first inclined tooth surface forms a vortex negative pressure zone, and the flow rate of the flue gas is 6-12 m / s, which will generate a Karman vortex street. The vortex has high energy and periodic characteristics. The vortex periodically sheds and hits the accumulated soot on the second inclined tooth surface, the arc surface and the first inclined tooth surface, thereby achieving a self-cleaning effect.

[0030] The air preheater cleaning device of the present invention adopts a controlled cleaning method of controlling the translation speed and vibration frequency, and has a good cleaning effect. It can also adopt a vibration method in which the left and right sides are not synchronized, and the two vibration devices at the front end of the walking direction vibrate, and the vibrations simultaneously form resonance. The translation drive method adopts a cylinder push rod drive device outside the boiler. The cylinder drive push and pull force is constant. If the cleaning plate is blocked due to dust accumulation, it will stay in place and continue to vibrate until the dust is cleaned up. In addition, the tooth plate of the present invention can form a vortex street effect to achieve self-cleaning. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 A schematic diagram showing the cooperation between an air preheater cleaning device and an air preheater according to an embodiment of the present invention;

[0032] Figure 2 A schematic diagram showing a structure of an air preheater dust cleaning device according to an embodiment of the present invention;

[0033] Figure 3 A partial diagram schematically showing an air preheater dust cleaning device according to the present invention;

[0034] Figure 4 A schematic diagram showing a structure of a horizontal driving device according to an embodiment of the present invention;

[0035] Figure 5 Schematic representation Figure 2 Enlarged view of part A in the middle;

[0036] Figure 6 Schematic representation Figure 2 Enlarged view of middle part B;

[0037] Figure 7 Schematic representation based on Figure 4 Enlarged view of middle C;

[0038] Figure 8 Schematic diagram of the structure of a transverse support assembly and a vertical vibration device according to an embodiment of the present invention Figure 1 ;

[0039] Fig. 9 Schematic diagram of the structure of a transverse support assembly and a vertical vibration device according to an embodiment of the present invention Figure 2 ;

[0040] Fig.10 A schematic diagram showing a connection structure of a tooth plate and a main shaft according to an embodiment of the present invention;

[0041] Fig.11 A schematic diagram showing the structure of a tooth plate according to an embodiment of the present invention;

[0042] Fig.12 A schematic diagram showing the structure of a tooth plate according to a second embodiment of the present invention;

[0043] Fig.13 A structural diagram schematically showing a sawtooth structure according to an embodiment of the present invention;

[0044] Fig.14 A schematic diagram showing a gas circuit principle diagram of a horizontal drive device according to an embodiment of the present invention;

[0045] Fig.15 The figure schematically shows the gas path principle diagram of the vertical vibration device according to one embodiment of the present invention.

[0046] The numbers in the accompanying drawings represent the following meanings:

[0047] 1. First track; 2. Second track; 3. Horizontal bracket assembly; 4. Connecting frame; 5. Vertical vibration device; 6. Main shaft; 7. Tooth plate; 8. Adapter plate; 9. Horizontal drive device; 31. First horizontal bracket; 32. Second horizontal bracket; 33. Card plate; 34. Support baffle; 35. Main shaft limit hole; 36. Support seat; 37. Mounting seat; 51. Air oscillator; 52. Vibration piston rod; 53. Moving block; 54. Return spring; 361. Bottom plate; 531. Upper moving block; 532. Lower moving block; 533. Guide column; 38. Air duct; 39. Air pipe; 41. First connecting frame; 42. Second connecting frame; 4 3. Strengthening bracket; 421. Roller; 422. Track baffle; 423. Anti-drop plate; 91. Cylinder; 911. Piston rod; 92. Push rod; 10. Wall sealing assembly; 101. Main structure; 102. Flange pressing piece; 103. Insulation cotton layer; 93. Cylinder support; 94. Adjustment hole; 95. Fixing plate; 96. Adjustment shaft; 71. Plate body; 72. Sawtooth structure; 912. Thread; 913. Nut; 914. Auxiliary limiting plate; 61. Tooth plate seat; 62. Tooth plate cover; 63. Connecting piece; 711. Sawtooth plate; 731. First inclined tooth surface; 732. Tooth top surface; 733. Second inclined tooth surface; 734. Arc surface. DETAILED DESCRIPTION

[0048] 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 are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0049] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. The embodiments cannot be described one by one here, but the embodiments of the present invention are not therefore limited to the following embodiments.

[0050] Combination Figure 1-Figure 3 As shown, the present invention provides an air preheater cleaning device, including a first track 1, a second track 2, a transverse support assembly 3, a connecting frame 4, a vertical vibration device 5, a main shaft 6, a tooth plate 7, an adapter plate 8 and a horizontal drive device 9.

[0051] In the present invention, two groups of transverse support assemblies 3 are provided, and the two groups of transverse support assemblies 3 are arranged parallel to each other on the upper side of the first track 1 and the second track 2. The connecting frame 4 is connected between the two groups of transverse support assemblies 3, and vertical vibration devices 5 are respectively provided on the upper side of the two lateral ends of each group of transverse support assemblies 3, that is, in the present invention, a total of four vertical vibration devices 5 are provided. The main shaft 6 is connected to the vertical vibration device 5, and a plurality of tooth plates 7 are arranged on the main shaft 6 at intervals. In addition, in this embodiment, the adapter plate 8 is provided in the middle of one group of transverse support assemblies 3, and the horizontal drive device 9 is connected to the adapter plate 8.

[0052] The air preheater cleaning device of the present invention can drive the adapter plate 8 and the transverse support assembly 3 to move along the first track 1 and the second track 2 through the operation of the horizontal device 9. Since the connecting frame 4 connects the two groups of transverse support assemblies 3 together, the two groups of transverse support assemblies 3 can be synchronously moved along the first track 1 and the second track 2, so that the tooth plate 7 can be translated between the air preheater tubes to achieve the cleaning operation. At the same time, due to the setting of the vertical vibration device 5, the tooth plate 7 can be driven to reciprocate up and down, and the tooth plate 7 can reciprocate from top to bottom in the gap between the heat exchange tubes, cutting and shaking off the sticky or compacted dust on the heat exchange tubes, and the dust accumulated on the tube plates at both ends of the air preheater can also be cleaned.

[0053] Combination Figure 1-Figure 3 , Figure 8 and Fig. 9 As shown, according to one embodiment of the present invention, the transverse bracket assembly 3 includes a first transverse bracket 31 and a second transverse bracket 32 ​​that are spaced apart, a clamping plate 33 fixedly connected to the first transverse bracket 31 and the second transverse bracket 32, and a support baffle 34 located between the first transverse bracket 31 and the second transverse bracket 32, the support baffle 34 is located between the first transverse bracket 31 and the second transverse bracket 32, and a spindle limiting hole 35 is provided on the support baffle 34; the first transverse bracket 31 and the second transverse bracket 32 ​​are connected to a support seat 36, and a mounting seat 37 is fixedly connected to the upper side of the clamping plate 33 and the support seat 36, and the vertical vibration device 5 is installed on the mounting seat 37.

[0054] In this embodiment, the connecting frame 4 includes a first connecting frame 41 and a second connecting frame 42 which are arranged parallel to each other in the vertical direction. The first connecting frame 41 and the second connecting frame 42 are fixedly connected to the card plate 33. The first connecting frame 41 and the second connecting frame 42 are arranged perpendicularly to the first transverse bracket 31 and the second transverse bracket 32. A reinforcing bracket 43 is further arranged between the second transverse bracket 32 ​​and the second connecting frame 42. The first connecting frame 41, the second connecting frame 42 and the air path conduit 38 are arranged opposite to each other on both sides of the card plate 33; the lower side of the second connecting frame 42 is connected to a roller 421, and the roller 421 is provided with a track baffle 422. The card plate 33 is also connected to an anti-drop hanging plate 423. Such an arrangement is conducive to the smooth movement of the transverse bracket assembly 3.

[0055] like Figure 8 and Fig. 9 As shown, in this embodiment, the vertical vibration device 5 includes an air oscillator 51 installed on the mounting seat 37, the air oscillator 51 has a vibration piston rod 52, the lower part of the vibration piston rod 52 is connected to a moving block 53, the main shaft 6 passes through the moving block 53, the lower side of the moving block 53 is connected to a return spring 54, the support seat 36 includes a bottom plate 361, and the other end of the return spring 54 is located on the bottom plate 361 and connected to the bottom plate 361.

[0056] According to one embodiment of the present invention, the moving block 53 of the present invention includes an upper moving block 531 and a lower moving block 532 which are arranged relatively to each other, and the upper moving block 531 and the lower moving block 532 are provided with semicircular arc surfaces which cooperate with the main shaft 6. The return spring 54 is connected to the lower moving block 532, and a guide column 533 is also connected to the lower moving block 532. The return spring 54 is located at the periphery of the guide column 533, and a circular hole is provided on the bottom plate 361, and the guide column 533 passes through the circular hole. The clamping plate 33 is also connected to an air conduit 38, and the air conduit 38 is connected to the air oscillator 51 through the air pipe 39.

[0057] Combination Fig.15As shown, there is an air circuit interface at the top of the air oscillator 51, and compressed air is input through the air pipe 39. The front end of the air circuit 39 is connected to the air circuit interface of the air circuit conduit 38, which is a metal hard pipe. The air circuit conduit 38 passes through the wall sealing component 10 on the boiler flue wall and is connected to the clamping plate 33. The air circuit interface of the air circuit conduit 38 is connected to the output port of the electromagnetic control valve, and the input port of the electromagnetic control valve is connected to the external compressed air source. The electromagnetic control valve controls the air oscillator 51 to rush out and retract. When the electromagnetic control valve is opened, compressed air enters the pressure chamber of the air oscillator 51 through the pipeline, overcomes the magnetic force of the magnet, and instantly explodes to drive the air oscillator to vibrate. When the electromagnetic control valve is closed, the compressed air in the pressure chamber of the air oscillator 51 returns to the atmosphere through the pipeline, and the vibration piston rod 52 of the air oscillator 51 retracts and resets under the action of the internal spring. The vibration frequency of the air oscillator 51 is controlled by the control valve. When the vibration piston rod 52 of the air oscillator rushes downward to push the moving block 53 and the main shaft 6 to move downward, the reset spring 54 is compressed. When the vibration piston rod of the air oscillator retracts upward, the reset spring 54 pushes the moving block 53 and the main shaft 6 upward to return to their original positions. In this way, the air exciter vibrates and drives the main shaft to reciprocate up and down, so that the tooth plate can reciprocate from top to bottom in the gap between the heat exchange tubes, cutting and shaking off the sticky or hardened dust on the heat exchange tubes.

[0058] According to the concept of the present invention, under the control of the control valve, the air oscillator on the vibration device arranged at the same end is extended and retracted synchronously or asynchronously, so as to realize synchronous or asynchronous vibration of the vibration device. Under the control of the control valve, the vibration device with the same main axis makes the cleaning plate vibrate strongly when it reciprocates up and down in an asynchronous vibration mode, which is conducive to the removal of the accumulated dust adhering to the cleaning plate. The control valve is controlled by the electromagnetic coil to control the frequency of on and off, and the working frequency of the air oscillator can be controlled by adjusting the frequency.

[0059] Combination Figure 2 , Figure 4-Figure 7 As shown, according to an embodiment of the present invention, the horizontal driving device 9 includes a cylinder 91 and a push rod 92 fixedly connected to the cylinder 91. The cylinder 91 is connected to a piston rod 911, and the piston rod 911 is fixedly connected to the push rod 92, and the connection method can be threaded connection, flange connection, pin connection, welding, etc. In this embodiment, a thread 912 is provided at the front end of the piston rod 911, and a nut 913 is provided on the push rod 92. The push rod 92 is fixedly connected to the piston rod 911 through the cooperation of the nut 913 and the thread 912. An auxiliary limit plate 914 is also provided on the push rod 92 of the present invention.

[0060] Since the air preheater is arranged at the tail end of the flue, the air duct 38 and the push rod 92 of the cleaning device of the present invention need to be arranged through the flue wall. Specifically, a wall sealing assembly 10 is provided on the flue wall, and the push rod 92 passes through the wall sealing assembly 10 to be connected to the adapter plate 8, and the air duct 38 passes through the wall sealing assembly 10 to be connected to the clamping plate 33.

[0061] In this embodiment, the wall sealing assembly 10 includes a main structure 101 and a flange pressing piece 102 connected to the main structure 101; a heat-insulating cotton layer 103 is provided inside the main structure 101, and such a configuration is conducive to ensuring sealing.

[0062] In the container preheater cleaning device of the present invention, the push rod 92 passes through the wall sealing assembly 10 with a sealing function on the flue wall, and the other end is connected to the transverse bracket assembly 3, so that the piston rod 911 of the cylinder 91 can extend and retract to drive the transverse bracket assembly 3 to reciprocate. Under the push or pull of the cylinder, the tooth plate device is blocked before reaching the designed limit position, and the cylinder still applies force in the forward direction to keep applying pressure, and the tooth plate maintains the forward trend. Under the action of the tooth plate, the accumulated dust will be cleaned up, achieving the purpose of removing the accumulated dust. After the cylinder encounters resistance when starting, the thrust can be kept constant, and the rear-end pushed equipment will not be damaged.

[0063] Combination Fig.14 As shown, the control valve can be used to control the flow of compressed air entering the cylinder to adjust the cylinder extension and contraction speed, thereby adjusting the reciprocating speed of the push rod transverse bracket assembly.

[0064] In addition, according to an embodiment of the present invention, the horizontal drive device 9 also includes a relatively arranged cylinder support 93, an adjustment hole 94 is provided on the cylinder support 93, a fixing plate 95 is connected to the front end of the cylinder 91, and an adjustment shaft 96 is provided on the fixing plate 95 to match the adjustment hole 94. This installation form allows the cylinder to be axially fixed and constrained, with a slight space for upward and downward and lateral movement, so that the central axis of the piston rod can be adjusted to be flush with the axis center line of the wall sealing assembly.

[0065] Combination Figure 10-13 As shown, according to an embodiment of the present invention, the tooth plate 7 is connected to the main shaft 6 through the tooth plate seat 61 and the tooth plate cover 62. The tooth plate 7 has a self-cleaning function and includes a plate body 71 and a sawtooth structure 72 arranged on the plate body 71. The sawtooth structures 72 of the cleaning tooth plates 7 at the two transverse bracket assemblies 3 are arranged in opposite directions. Such an arrangement can be used to clean the end plates on both sides of the air preheater.

[0066] According to a second embodiment of the present invention, the toothed plate may also be configured to include a plate body 71, a sawtooth plate 711 fixedly connected to the plate body 71, and a plurality of sawtooth structures 72 are provided on the outer edge of the sawtooth plate 711. In this embodiment, the sawtooth plate 711 and the plate body 71 may be fixedly connected by welding, riveting or bolting. The plate body 71 and the sawtooth plate 711 may be made of aluminum alloy to reduce weight.

[0067] The thickness of the tooth plate 7 of the present invention is set to 1 / 3+0.5mm of the gap between adjacent heat exchange tubes, and such setting is conducive to ensuring the dust cleaning effect. In the present invention, the sawtooth structure 72 includes a first inclined tooth surface 731, a tooth top surface 732 and a second inclined tooth surface 733 connected in sequence, the inclination direction of the second inclined tooth surface 733 is consistent with the inclination direction of the first inclined tooth surface 731, and the inclination angle between the first inclined tooth surface 731 and the tooth top surface 732 is smaller than the inclination angle between the second inclined tooth surface 733 and the tooth top surface 732. The first inclined tooth surface 731 is the windward surface, the tooth top surface 732 is a plane, and the angle between the first inclined tooth surface 731 and the tooth top surface 372 is 33°-35°. And the second inclined tooth surface 733 of the sawtooth structure 72 is connected to the first inclined tooth surface 731 of the adjacent sawtooth structure 72 through an arc surface 7344, and the arc surface 7344 is concave in the direction away from the tooth top surface 732.

[0068] The tooth plate of the air preheater of the present invention is vertically arranged between adjacent heat exchange tubes, and the direction of flue gas flow is from top to bottom. Since the angle between the first inclined tooth surface 731 and the tooth top surface 732 is 33°-35°, and the angle between the second inclined tooth surface 733 and the tooth top surface 732 is greater than the angle between the first inclined tooth surface 731 and the tooth top surface 732, and the arc surface 734 is arranged to connect the second inclined tooth surface 733 and the first inclined tooth surface 731 of the adjacent sawtooth structure 72, when the flue gas passes from top to bottom, the space surrounded by the second inclined tooth surface 733, the arc surface 734 and the first inclined tooth surface 731 forms a vortex negative pressure zone, and the flow rate of the flue gas is 6-12 m / s, which will generate a Karman vortex street. The vortex has high energy and periodic characteristics. The vortex periodically falls off and hits the accumulated soot on the second inclined tooth surface 733, the arc surface 734 and the first inclined tooth surface 731, thereby achieving a self-cleaning effect.

[0069] According to an embodiment of the present invention, chamfers are provided on both sides of the width direction of the sawtooth plate 711. Such a configuration can prevent the sawtooth plate from damaging the surface coating of the heat exchange tube when in contact with the surface of the heat exchange tube, thereby reducing the corrosion resistance of the heat exchange tube.

[0070] The air preheater cleaning device of the present invention adopts a controlled cleaning method of controlling the translation speed and vibration frequency, and has a good cleaning effect. It can also adopt a vibration method in which the left and right sides are not synchronized, and the two vibration devices at the front end of the walking direction vibrate, and the vibrations simultaneously form resonance. The translation drive method adopts a cylinder push rod drive device outside the boiler. The cylinder drive push and pull force is constant. If the cleaning plate is blocked due to dust accumulation, it will stay in place and continue to vibrate until the dust is cleaned up. In addition, the tooth plate of the present invention can form a vortex street effect to achieve self-cleaning.

[0071] The above is only one embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An air preheater dust cleaning device, comprising a first track (1) and a second track (2), characterized in that: Two transverse support assemblies (3) are provided on the upper sides of the first track (1) and the second track (2) in parallel with each other, the transverse support assemblies (3) move along the first track (1) and the second track (2), and a connecting frame (4) is connected between the two transverse support assemblies (3); The upper sides of the two lateral ends of the lateral support assembly (3) are respectively provided with vertical vibration devices (5), the vertical vibration device (5) is connected to a main shaft (6), and a plurality of tooth plates (7) are arranged at intervals on the main shaft (6); The middle part of the transverse support assembly (3) is connected to an adapter plate (8), and the adapter plate (8) is connected to a horizontal driving device (9) for driving the transverse support assembly (3) to move along the first track (1) and the second track (2).

2. The air preheater cleaning device according to claim 1, characterized in that: The transverse support assembly (3) comprises a first transverse support (31) and a second transverse support (32) which are arranged at intervals, a clamping plate (33) fixedly connected to the first transverse support (31) and the second transverse support (32), and a support baffle (34) located between the first transverse support (31) and the second transverse support (32), wherein a main shaft limiting hole (35) is provided on the support baffle (34); The first transverse bracket (31) and the second transverse bracket (32) are connected to a support seat (36), the clamping plate (33) and the upper side of the support seat (36) are fixedly connected to a mounting seat (37), and the vertical vibration device (5) is mounted on the mounting seat (37).

3. The air preheater dust cleaning device according to claim 2, characterized in that: The vertical vibration device (5) comprises an air oscillator (51) mounted on the mounting seat (37), the air oscillator (51) having a vibration piston rod (52), a moving block (53) being connected to the lower part of the vibration piston rod (52), the main shaft (6) passing through the moving block (53), and a return spring (54) being connected to the lower side of the moving block (53); The support seat (36) comprises a bottom plate (361), and the other end of the return spring (54) is located on the bottom plate (361) and connected to the bottom plate (361).

4. The air preheater dust cleaning device according to claim 3, characterized in that: The moving block (53) comprises an upper moving block (531) and a lower moving block (532) which are arranged opposite to each other, and the upper moving block (531) and the lower moving block (532) are provided with semicircular arc surfaces which are matched with the main shaft (6); The return spring (54) is connected to the lower moving block (532), and the lower moving block (532) is also connected to a guide column (533), and the return spring (54) is located on the periphery of the guide column (533); The bottom plate (361) is provided with a circular hole, and the guide column (533) passes through the circular hole.

5. The air preheater cleaning device according to claim 3, characterized in that: The clamping plate (33) is also connected to an air conduit (38), and the air conduit (38) is connected to the air oscillator (51) through an air pipe (39).

6. The air preheater dust cleaning device according to claim 5, characterized in that: The connecting frame (4) comprises a first connecting frame (41) and a second connecting frame (42) which are arranged parallel to each other in a horizontal direction, the first connecting frame (41) and the second connecting frame (42) are fixedly connected to the clamping plate (33), and the first connecting frame (41) and the second connecting frame (42) are arranged vertically to the first transverse bracket (31) and the second transverse bracket (32); A reinforcing bracket (43) is further provided between the second transverse bracket (32) and the second connecting bracket (42); The first connecting frame (41), the second connecting frame (42) and the air path conduit (38) are arranged opposite to each other on both sides of the clamping plate (33); The lower side of the second connecting frame (42) is connected to a roller (421), the roller (421) is provided with a track baffle (422), and the clamping plate (33) is also connected to an anti-dropping plate (423).

7. The air preheater dust cleaning device according to claim 1, characterized in that: The horizontal driving device (9) comprises a cylinder (91) and a push rod (92) fixedly connected to the cylinder (91); The air preheater also includes a through-wall sealing assembly (10), and the push rod (92) passes through the through-wall sealing assembly (10) and is connected to the adapter plate (8).

8. The air preheater dust cleaning device according to claim 7, characterized in that: The wall sealing assembly (10) comprises a main structure (101) and a flange pressing sheet (102) connected to the main structure (101); A heat-insulating cotton layer (103) is provided inside the main structure (101).

9. The air preheater dust cleaning device according to claim 8, characterized in that: The horizontal driving device (9) further comprises cylinder supports (93) arranged opposite to each other, and an adjustment hole (94) is provided on the cylinder supports (93); The front end of the cylinder (91) is connected to a fixing plate (95), and the fixing plate (95) is provided with an adjustment shaft (96) that matches the adjustment hole (94).

10. The air preheater cleaning device according to claim 1, characterized in that: The tooth plate (7) has a self-cleaning function and comprises a plate body (71) and a sawtooth structure (72) arranged on the plate body (71); the sawtooth structures (72) of the cleaning tooth plates (7) at the two transverse bracket assemblies (3) are arranged in opposite directions.

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