A pouring-type cleaning device for a vertical air preheater

Abstract

This utility model relates to a water-spraying cleaning device for a vertical air preheater. It includes a rotary drive assembly and a cleaning fluid spraying assembly. Multiple telescopic support arms are mounted on the top of the rotary drive assembly. The cleaning fluid spraying assembly includes a base, with detachable support plates mounted on the left and right sides of the base. An extension frame is mounted on the outer side of each support plate. A telescopic frame is located below the support plates and extension frames, and multiple nozzles are mounted at the bottom of the telescopic frame. A telescopic control mechanism is mounted on the support plates to drive the extension frames to move inward and outward and to control the telescopic frame to extend and retract. A pipe connector is mounted at the bottom of the base, and each nozzle is connected to the pipe connector via a distribution pipe. It also includes a delivery pipe whose lower end is connected to the pipe connector, and whose upper end is connected to a cleaning fluid supply pipe via a rotary pipe connector. This utility model reduces workload, improves the efficiency of cleaning fluid spraying, and enhances personnel safety during cleaning operations.

Description

Technical Field

[0001] This utility model belongs to the field of cleaning equipment technology, and in particular relates to a pouring cleaning device for a vertical air preheater. Background Technology

[0002] Air preheaters are heat exchange devices used in thermal power plants. They are regenerative heat exchangers that operate in a counter-current manner. Over time, scale builds up inside the air preheater. This scale layer reduces heat exchange efficiency, and in severe cases, thicker scale can clog the heat exchange tubes, leading to equipment failure. Therefore, regular cleaning of the air preheater is necessary to remove scale and restore its heat exchange capacity.

[0003] Because the scale inside the heat exchanger tubes of the air preheater is quite dense, directly unclogging the tubes is not a feasible solution. Severely clogged scale prevents tools like steel rods from penetrating the tubes. Therefore, before unclogging, the tubes need to be soaked in a cleaning solution. This solution is typically a mixture of chelating agents, high-efficiency dispersants, penetrants, corrosion inhibitors, and water. During the cleaning process, the solution disperses, penetrates, and inhibits corrosion, promoting the softening and removal of the scale. As mentioned earlier, the scale is quite dense, so a single cleaning operation requires repeated spraying of the cleaning solution. Each spray is followed by a pause to allow the solution to soak into the scale, and then the process is repeated until the scale inside the heat exchanger tubes is observed to be fully soaked and softened from the bottom.

[0004] The aforementioned work is not suitable for manual operation: First, the repeated spraying of cleaning fluid is labor-intensive and inefficient; second, the air preheater has limited internal space and may contain harmful gases, potentially affecting personal safety and health. Therefore, auxiliary cleaning facilities need to be developed and designed. Utility Model Content

[0005] The purpose of this utility model is to provide a water-spraying cleaning device for vertical air preheaters, which reduces workload, improves the efficiency of cleaning fluid spraying, and enhances the safety of personnel during cleaning operations.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a vertical air preheater irrigation-type cleaning device, comprising a rotary drive assembly and a cleaning fluid spraying assembly driven by the rotary drive assembly. Multiple telescopic support arms are installed on the top of the rotary drive assembly, and the rotary drive assembly is supported and fixed in the middle of the air preheater's inner cavity via these telescopic support arms. The cleaning fluid spraying assembly includes a base, with detachable support plates installed on the left and right sides of the base. An extension frame is installed on the outer side of each support plate. A telescopic frame is provided below the support plates and extension frames, and multiple nozzles are installed at the bottom of the telescopic frame. A telescopic control mechanism is installed on the support plate to drive the extension frame to move inward and outward, and to allow the telescopic frame to extend and retract. A pipe connector is installed at the bottom of the base, and each nozzle is connected to the pipe connector via a distribution pipe. It also includes a delivery pipe with its lower end connected to the pipe connector, and the upper end of the delivery pipe is connected to a cleaning fluid supply pipe via a rotary pipe connector.

[0007] Preferably, a slot is provided on the side of the base, and the inner end of the support plate is inserted into the slot on this side and fixed by bolts.

[0008] Preferably, the telescopic control mechanism includes a lead screw mounted above the support plate, a strip hole in the middle of the support plate, a nut on the lead screw located in the strip hole, and an extension frame including a telescopic rod that passes through a hole at the end of the support plate into the strip hole and is fixedly connected to the nut. The inner end of the telescopic frame is connected to the support plate, and the outer end of the telescopic frame is connected to the extension frame.

[0009] Preferably, a support pipe with a flange on top is also installed on the top of the base, the upper end of the support pipe is connected to the rotary drive assembly, and the delivery pipe extends upward in the inner cavity of the support pipe.

[0010] Preferably, the rotary drive assembly includes a drive bracket, a rotary drive motor is installed inside the drive bracket, a drive gear is installed at the lower end of the motor shaft of the rotary drive motor, a central shaft is also installed at the bottom of the drive bracket, a rotary sleeve is installed on the central shaft, and a driven gear that meshes with the drive gear is installed at the upper end of the rotary sleeve, a swing arm is installed on the outer wall of the rotary sleeve, a bushing is installed at the outer end of the swing arm, a rotating shaft tube is installed inside the bushing, the upper flange of the support tube is fixedly connected to the lower flange of the rotating shaft tube, and the conveying pipe passes upward through the central channel of the rotating shaft tube.

[0011] Preferably, a connecting seat with a connecting plate on the side is installed at the lower end of the central shaft, a connecting plate is provided on the outer wall of the rotating shaft tube, and a tie rod is installed between the connecting seat and the connecting plate of the rotating shaft tube.

[0012] Preferably, there are two telescopic support arms that extend and retract to both sides respectively; the telescopic support arm includes an outer tube fixed to the top of the drive bracket and a telescopic tube located inside the outer tube. A drive screw is provided at the rear of the inner part of the outer tube. The rear end of the drive screw extends from the shaft seat at the rear end of the outer tube and is equipped with a handle. The nut on the drive screw is located inside the rear port of the telescopic tube and is fixedly connected. A rubber block is installed at the outer end of the telescopic tube.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: A vertical air preheater irrigation-type cleaning device, by installing telescopic support arms on the top of the rotary drive assembly, can support and fix the rotary drive assembly in the middle of the air preheater's inner cavity through the telescopic support arms, thus suspending the cleaning fluid spraying assembly above the air preheater's heat exchange tubes. By using the rotary drive assembly to drive the cleaning fluid spraying assembly to rotate, a circumferential rotary cleaning fluid spraying effect is achieved, that is, an irrigation-type spray cleaning effect is realized.

[0014] This irrigation-type cleaning device is installed inside the air preheater. The cleaning operator controls it from outside the air preheater. The cleaning liquid spraying component, driven by a rotary drive component, performs repeated spraying of cleaning liquid, thus reducing the workload and improving the efficiency of cleaning liquid spraying. Since the cleaning operator does not need to be inside the air preheater, the safety of the cleaning operation is improved. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the main structure of the present invention in its application state;

[0016] Figure 2 This is a cross-sectional structural diagram of the main body of this utility model;

[0017] Figure 3 yes Figure 1 A three-dimensional structural diagram of the slewing drive component, from a lower perspective;

[0018] Figure 4 yes Figure 1 A three-dimensional structural diagram of the cleaning fluid spraying component, viewed from below.

[0019] In the diagram: 1. Telescopic support arm; 1-1. Handle; 1-2. Outer sleeve; 1-3. Drive screw; 1-4. Telescopic tube; 1-5. Rubber block; 2. Rotary drive motor; 3. Drive gear; 4. Rotary sleeve; 5. Drive bracket; 6. Driven gear; 7. Swing arm; 8. Cleaning fluid supply pipe; 9. Rotary pipe connector; 10. Bushing; 11. Rotating shaft tube; 12. Support tube; 13. Tie rod; 14. Cleaning fluid spraying assembly; 14-1. Base; 14-2. Support plate; 14-3. Extension frame; 14-4. Telescopic control mechanism; 14-5. Pipe connector; 14-6. Distributor pipe; 14-7. Telescopic frame; 14-8. Nozzle; 15. Air preheater inner wall; 16. Air preheater heat exchanger pipes; 17. Central shaft; 18. Connecting seat; 19. Delivery pipe. Detailed Implementation

[0020] Please see Figure 1 This utility model provides a watering-type cleaning device for a vertical air preheater, including a rotary drive assembly and a cleaning liquid spraying assembly 14 driven by the rotary drive assembly. Multiple telescopic support arms 1 are installed on the top of the rotary drive assembly, and the rotary drive assembly is supported and fixed in the middle of the inner cavity of the air preheater through each telescopic support arm 1.

[0021] Figure 1 The diagram shows the internal structure of the cleaning device inside the air preheater. It can be seen that each telescopic support arm 1 extends and its end abuts against the inner wall 15 of the air preheater. Therefore, the rotary drive assembly and the cleaning fluid spraying assembly 14 are suspended above the heat exchange tubes 16 of the air preheater. During operation, the rotary drive assembly drives the cleaning fluid spraying assembly 14 to rotate, and the cleaning fluid spraying assembly 14 sprays cleaning fluid onto the heat exchange tubes 16 of the air preheater below, thus achieving a pouring-type spray cleaning effect. The cleaning fluid sprayed onto the heat exchange tubes 16 of the air preheater flows into the heat exchange tubes and is finally discharged from the lower end of the heat exchange tubes. During this process, the cleaning fluid wets and softens the scale inside the tubes.

[0022] like Figure 2 As shown, there are two telescopic support arms 1, which extend and retract to both sides respectively. Of course, it is conceivable that more telescopic support arms 1 can be set as needed, such as three or four telescopic support arms 1 with equal circumferential angle intervals, to provide better suspension support for the rotary drive assembly and the cleaning fluid spraying assembly 14.

[0023] The telescopic support arm 1 includes an outer tube 1-2 and a telescopic tube 1-4 located inside the outer tube 1-2. A drive screw 1-3 is provided at the rear of the inner part of the outer tube 1-2. The rear end of the drive screw 1-3 extends from the shaft seat at the rear end of the outer tube 1-2 and is equipped with a handle 1-1. The nut on the drive screw 1-3 is located inside the rear port of the telescopic tube 1-4 and is fixedly connected. A rubber block 1-5 is installed at the outer end of the telescopic tube 1-4.

[0024] The drive screw 1-3 is rotated by the handle 1-1, and its nut moves forward or backward on the drive screw 1-3. Correspondingly, the telescopic tube 1-4 moves forward or backward, producing a telescopic action. The rubber block 1-5 set at the outer end of the telescopic tube 1-4 abuts against the inner wall 15 of the air preheater and is deformed by pressure. The resulting elastic force and friction can better keep the cleaning device in the set position inside the air preheater.

[0025] Please see Figure 2 and Figure 3 It can be seen that:

[0026] The rotary drive assembly includes a drive bracket 5, inside which a rotary drive motor 2 is installed. The outer sleeve 1-2 of the telescopic support arm 1 is fixedly connected to the drive bracket 5. Specifically, as shown in the figure, the drive bracket 5 includes a top plate, a bottom plate, and connecting columns located between the four corners of the top plate and the bottom plate. The outer sleeve 1-2 is fixedly connected to the top plate, and the rotary drive motor 2 is mounted and fixed on the bottom plate.

[0027] A drive gear 3 is mounted on the lower end of the motor shaft of the rotary drive motor 2. A central shaft 17 is also mounted on the bottom of the drive bracket 5. A rotary sleeve 4 is mounted on the central shaft 17, and a driven gear 6 that meshes with the drive gear 3 is mounted on the upper end of the rotary sleeve 4. A swing arm 7 is mounted on the outer wall of the rotary sleeve 4. A bushing 10 is mounted on the outer end of the swing arm 7, and a rotating shaft tube 11 is mounted inside the bushing 10. Under the driving action of the rotary drive motor 2, the rotary sleeve 4 rotates around the central shaft 17, and the swing arm 7 rotates around the central shaft 17.

[0028] In this embodiment, a connecting seat 18 with a connecting plate on its side is installed at the lower end of the central shaft 17, and a connecting plate is provided on the outer wall of the rotating shaft tube 11. A pull rod 13 is installed between the connecting plates of the connecting seat 18 and the rotating shaft tube 11. The function of installing the pull rod 13 between the connecting seat 18 and the rotating shaft tube 11 is to improve the stability of the rotary drive assembly during operation and prevent the rotating shaft tube 11 and the cleaning fluid spraying assembly 14 below it from shaking during operation. Since the cleaning fluid spraying assembly 14 sprays the cleaning fluid downwards at a certain pressure, the cleaning fluid spraying assembly 14 generates an upward thrust on the swing arm 7 of the rotary drive assembly. By setting the pull rod 13, the influence of the aforementioned thrust on the swing arm 7 can be reduced.

[0029] Please see Figure 4 It can be seen that:

[0030] The cleaning fluid spraying assembly 14 includes a base 14-1, with detachable support plates 14-2 installed on the left and right sides of the base 14-1. An extension frame 14-3 is installed on the outer side of each support plate 14-2. A telescopic frame 14-7 is provided below the support plates 14-2 and the extension frames 14-3, and multiple nozzles 14-8 are installed at the bottom of the telescopic frame 14-7. A telescopic control mechanism 14-4 for driving the telescopic frame 14-7 to extend and retract is installed on the support plate 14-2. A pipe connector 14-5 is installed at the bottom of the base 14-1, and each nozzle 14-8 is connected to the pipe connector 14-5 through a liquid distribution pipe 14-6.

[0031] It also includes a delivery pipe 19 whose lower end is connected to the pipe connector 14-5, and the upper end of the delivery pipe 19 is connected to the cleaning fluid supply pipe 8 through a rotary pipe connector 9. During operation, the cleaning fluid supply pump delivers the cleaning fluid through the cleaning fluid supply pipe 8. The cleaning fluid reaches the pipe connector 14-5 through the rotary pipe connector 9 and the delivery pipe 19, and then reaches each nozzle 14-8 through the distribution pipe 14-6 and is sprayed out.

[0032] The purpose of using a rotary pipe fitting 9 to connect the cleaning fluid supply pipe 8 and the delivery pipe 19 is to allow the cleaning fluid supply pipe 8 and the delivery pipe 19 to rotate relative to each other while ensuring the pipe connection, thus avoiding the problem of kinking in the cleaning fluid supply pipe 8.

[0033] In this embodiment, a slot is provided on the side of the base 14-1, and the inner end of the support plate 14-2 is inserted into the slot on this side and fixed with bolts. The advantage of this structure is that the support plate 14-2 and its auxiliary structures (extension frame 14-3, telescopic frame 14-7, and nozzle 14-8) can be disassembled and assembled with the base 14-1. The dispensing pipe 14-6 includes a dispensing main pipe and multiple dispensing branch pipes. The end of the dispensing main pipe is provided with a connector and the connector is connected to the pipe joint 14-5. Each dispensing branch pipe is connected to the water inlet of each nozzle 14-8. When it is necessary to disassemble the cleaning fluid spraying assembly 14, the support plate 14-2 is disconnected from the base 14-1, and the dispensing main pipe of the dispensing pipe 14-6 is disconnected from the pipe joint 14-5.

[0034] In this embodiment, the telescopic control mechanism 14-4 includes a lead screw installed above the support plate 14-2. A strip-shaped hole is provided in the middle of the support plate 14-2, and the lead screw nut is located in the strip-shaped hole. The extension frame 14-3 includes a telescopic rod, which passes through a hole provided at the end of the support plate 14-2 and is fixedly connected to the lead screw nut. The inner end of the telescopic frame 14-7 is connected to the support plate 14-2, and the outer end of the telescopic frame 14-7 is connected to the extension frame 14-3.

[0035] A rotating end is provided at the end of the telescopic control mechanism 14-4. The rotating end drives the lead screw to rotate forward or backward. When the lead screw rotates forward, the lead nut moves outward, driving the extension frame 14-3 outward, thus further extending the telescopic frame 14-7. The total length of the support plate 14-2 and the extension frame 14-3 increases, and the distance between the nozzles 14-8 increases. Conversely, when the lead screw rotates backward, the lead nut moves inward, driving the extension frame 14-3 inward, thus further retracting the telescopic frame 14-7. The total length of the support plate 14-2 and the extension frame 14-3 decreases, and the distance between the nozzles 14-8 decreases. The function of this structure is to allow the length of the cleaning fluid spray assembly 14 to extend and retract, thereby allowing the spray range of the bottom nozzles 14-8 to better cover the air preheater heat exchanger pipes 16 below. Figure 1 As shown, during operation, the length of the cleaning fluid spraying assembly 14 should be appropriate to the inner diameter of the air preheater, that is, the outermost nozzle 14-8 should be as close as possible to the inner wall 15 of the air preheater.

[0036] In this embodiment, a support pipe 12 with a flange on top is also installed on the top of the base 14-1. The upper end of the support pipe 12 is connected to the rotary drive assembly, and the delivery pipe 19 extends upward within the inner cavity of the support pipe 12. As shown in the figure, the upper flange of the support pipe 12 is fixedly connected to the lower flange of the rotating shaft pipe 11, and the delivery pipe 19 passes upward through the central channel of the rotating shaft pipe 11. In this way, the cleaning fluid spraying assembly 14 and the rotary drive assembly can be separated.

[0037] How to use:

[0038] Initially, all telescopic support arms 1 of this irrigation-type cleaning device are fully retracted, and the length of the cleaning fluid spraying component 14 is minimized to reduce the space occupied. The entire cleaning device is inserted into the air preheater housing through the inspection hole. Inside the air preheater housing, the operator extends each telescopic support arm 1. After extension, the ends of the telescopic support arms 1 press firmly against the inner wall 15 of the air preheater. The telescopic control mechanism 14-4 is adjusted according to the radial dimension of the air preheater cavity to adjust the length of the cleaning fluid spraying component 14. Finally, this irrigation-type cleaning device... Figure 1 The state shown is installed inside the air preheater shell, with the cleaning fluid spraying assembly 14 positioned at a certain distance (e.g., 30 cm) above the upper end face of the air preheater heat exchanger tubes 16. The cleaning fluid tank, cleaning fluid pump, and controller are located outside the air preheater. After the arrangement of this device inside the air preheater is completed, the operator moves to the outside of the air preheater to perform the operation.

[0039] The cleaning fluid pump is turned on, and the cleaning fluid is pressurized and delivered to pipe connector 14-5 via cleaning fluid supply pipe 8, rotary pipe connector 9, and delivery pipe 19. It then flows through distributor pipe 14-6 to each nozzle 14-8, finally spraying downwards. The rotary drive motor 2 is started, and the rotary drive assembly drives the cleaning fluid spraying assembly 14 to rotate while spraying the cleaning fluid. After each rotation, the rotary drive assembly is reversed, driving the cleaning fluid spraying assembly 14 to rotate in the opposite direction. During each spraying operation, the cleaning fluid spraying assembly 14 alternates between clockwise and counterclockwise rotations a suitable number of times (e.g., 5 rotations), then stops and enters a holding state. At this time, the cleaning fluid sprayed on the air preheater heat exchanger tubes 16 enters the tubes through the upper port and flows vertically downwards, wetting and softening the scale inside the heat exchanger tubes. After holding for a certain period (e.g., 1 hour), the operator performs the above operation again for the next watering-style spray cleaning operation, then returns to the holding state. Repeat this process multiple times until a good wetting and softening effect is observed on the scale at the bottom of the air preheater heat exchanger tube 16 at the bottom port, then stop the aforementioned pouring cleaning operation.

[0040] The operator then re-enters the air preheater shell, separates the cleaning device from the air preheater inner wall 15 while minimizing its size, and removes the cleaning device through the air preheater's inspection port. Further cleaning of the air preheater heat exchange tubes 16 is then performed, involving scale impregnation and softening, to facilitate the separation and discharge of scale from the heat exchange tubes.

Claims

1. A water-pouring cleaning device for a vertical air preheater, characterized in that: The system includes a rotary drive assembly and a cleaning fluid spraying assembly (14) driven by the rotary drive assembly. Multiple telescopic support arms (1) are installed on the top of the rotary drive assembly, and the rotary drive assembly is supported and fixed in the middle of the air preheater cavity by each telescopic support arm (1). The cleaning fluid spraying assembly (14) includes a base (14-1), and detachable support plates (14-2) are installed on the left and right sides of the base (14-1). An extension frame (14-3) is installed on the outside of each support plate (14-2), and a telescopic frame (14-7) is provided below the support plate (14-2) and the extension frame (14-3). Multiple nozzles (14-8) are installed at the bottom of the telescopic frame (14-7). A telescopic control mechanism (14-4) is installed on the support plate (14-2) to drive the extension frame (14-3) to move inward and outward and to extend and retract the telescopic frame (14-7). A pipe connector (14-5) is installed at the bottom of the base (14-1). Each nozzle (14-8) is connected to the pipe connector (14-5) through a liquid distribution pipe (14-6). It also includes a delivery pipe (19) whose lower end is connected to the pipe connector (14-5). The upper end of the delivery pipe (19) is connected to the cleaning fluid supply pipe (8) through a rotary pipe connector (9).

2. The pouring-type cleaning device for a vertical air preheater according to claim 1, characterized in that: A slot is provided on the side of the base (14-1), and the inner end of the support plate (14-2) is inserted into the slot on this side and fixed with bolts.

3. The pouring-type cleaning device for a vertical air preheater according to claim 2, characterized in that: The telescopic control mechanism (14-4) includes a lead screw installed above the support plate (14-2). A strip hole is provided in the middle of the support plate (14-2). The lead screw nut is located in the strip hole. The extension frame (14-3) includes a telescopic rod. The telescopic rod passes through a hole provided at the end of the support plate (14-2) and is fixedly connected to the lead screw nut. The inner end of the telescopic frame (14-7) is connected to the support plate (14-2), and the outer end of the telescopic frame (14-7) is connected to the extension frame (14-3).

4. The pouring-type cleaning device for a vertical air preheater according to claim 3, characterized in that: A support pipe (12) with a flange on top is also installed on the top of the base (14-1). The upper end of the support pipe (12) is connected to the rotary drive assembly and the delivery pipe (19) extends upward in the inner cavity of the support pipe (12).

5. The pouring-type cleaning device for a vertical air preheater according to claim 4, characterized in that: The rotary drive assembly includes a drive bracket (5), a rotary drive motor (2) is installed inside the drive bracket (5), a drive gear (3) is installed at the lower end of the motor shaft of the rotary drive motor (2), a central shaft (17) is also installed at the bottom of the drive bracket (5), a rotary sleeve (4) is installed on the central shaft (17), and a driven gear (6) that meshes with the drive gear (3) is installed at the upper end of the rotary sleeve (4). A swing arm (7) is installed on the outer wall of the rotary sleeve (4), a bushing (10) is installed at the outer end of the swing arm (7), a rotating shaft tube (11) is installed inside the bushing (10), the upper flange of the support tube (12) is fixedly connected to the lower flange of the rotating shaft tube (11), and the conveying pipe (19) passes upward through the central channel of the rotating shaft tube (11).

6. The pouring-type cleaning device for a vertical air preheater according to claim 5, characterized in that: A connecting seat (18) with a connecting plate on the side is installed at the lower end of the central shaft (17). A connecting plate is provided on the outer wall of the rotating shaft tube (11). A pull rod (13) is installed between the connecting seat (18) and the connecting plate of the rotating shaft tube (11).

7. The pouring-type cleaning device for a vertical air preheater according to claim 6, characterized in that: The telescopic support arm (1) has two arms and extends and retracts to the sides respectively. The telescopic support arm (1) includes an outer tube (1-2) fixed to the top of the drive bracket (5) and a telescopic tube (1-4) located inside the outer tube (1-2). A drive screw (1-3) is provided at the rear of the inner part of the outer tube (1-2). The rear end of the drive screw (1-3) extends from the shaft seat at the rear end of the outer tube (1-2) and is equipped with a handle (1-1). The nut on the drive screw (1-3) is located inside the rear port of the telescopic tube (1-4) and is fixedly connected. A rubber block (1-5) is installed at the outer end of the telescopic tube (1-4).

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