Cleaning device for steam generator

Abstract

The application discloses a cleaning device suitable for a steam generator, which comprises a mounting assembly, a guide rail assembly, a first driving assembly, a second driving assembly and a third driving assembly; the mounting assembly is used for connecting the cleaning device with the steam generator; the guide rail assembly comprises a guide rail body, a driving wheel and a driven wheel respectively arranged at two ends of the guide rail body and a conveying belt arranged on the driving wheel and the driven wheel; the first driving assembly is connected to the conveying belt and is used for driving the cleaning belt to stretch and retract; the second driving assembly is used for driving the driving wheel to rotate; the third driving assembly is used for driving the guide rail assembly to move, and the third driving assembly is arranged on the mounting assembly. The cleaning device suitable for the steam generator can quickly and accurately send the cleaning belt cleaning gun from the outer corridor of the steam generator to the position of the hard sludge between the pipes for fixed-point high-efficiency cleaning.

Description

Technical Field

[0001] This invention belongs to the field of steam generator cleaning technology, specifically relating to a flexible cleaning device suitable for precise cleaning of sludge on the secondary side tube sheet of a steam generator. Background Technology

[0002] During high-power operation, steam generators inevitably accumulate scale (sludge). If this scale remains for too long, it can gradually form hard sludge that is difficult to remove using conventional rigid flushing methods. This leads to localized temperature increases and introduces the risk of circumferential pressure corrosion cracking in the heat transfer tubes. According to statistics, the formation area of ​​hard sludge is primarily within the first 10 rows of tubes on the hot and cold sides, close to the central area.

[0003] Numerous studies have been conducted both domestically and internationally on the removal of hard sludge. The method employed involves delivering a flexible cleaning nozzle to the specific location of the hard sludge and using high-pressure water jets for targeted cleaning. Based on the structural characteristics of steam generators, there are two methods to deliver the flexible cleaning nozzle to the specific location of the hard sludge. One method involves extending the flexible cleaning nozzle vertically into the tube space to the location of the hard sludge, such as the widely used CECIL flexible cleaning technology abroad, and a flexible cleaning device with a linear guide drive mechanism (CN109973987A and CN114353050A) developed and repeatedly applied by the Nuclear Power Operation Research Institute in China. This approach leverages the ample available space in the central tube gallery of the steam generator for equipment installation, resulting in lower design and installation requirements. However, the significant height difference between the central tube gallery and the hard sludge on the tube sheet leads to unfavorable cleaning angles, making rapid and accurate positioning of the flexible cleaning nozzle difficult. Furthermore, since the hard sludge is mainly distributed in the first 10 rows of tubes near the central tube gallery, this method has low removal efficiency.

[0004] Another approach involves extending a flexible cleaning gun into the pipe section from the outer ring corridor of the steam generator, parallel to the central pipe corridor, to perform high-pressure cleaning of the hard sludge. This method only requires extending into the first 10 rows of pipes near the center of the central pipe corridor to cover almost all the hard sludge, resulting in high cleaning efficiency. The height difference between the flexible cleaning gun and the hard sludge on the tube sheet is minimal, allowing for quick and accurate positioning of the cleaning gun head, and providing a good cleaning angle. However, the outer ring corridor is narrow and curved, making equipment development difficult. Current research focuses on developing a trolley-driven system to extend the flexible cleaning gun into the pipe section from the outer ring corridor, such as the French PIPA magnetic crawling trolley actuator-driven flexible cleaning technology. However, this trolley-driven flexible cleaning technology suffers from low reliability, complex equipment structure, cumbersome installation, inconvenient operation, unstable trolley position, and poor alignment accuracy between pipes. Summary of the Invention

[0005] In view of this, in order to overcome the shortcomings of the prior art, the purpose of this invention is to provide a cleaning device suitable for steam generators, which can quickly and accurately deliver a cleaning belt and a cleaning gun from the outer ring of the steam generator into the pipe space to the location of hard sludge for targeted and efficient cleaning.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A cleaning device suitable for a steam generator includes a mounting assembly, a guide rail assembly, a first drive assembly, a second drive assembly, and a third drive assembly. The mounting assembly connects the cleaning device to the steam generator. The guide rail assembly includes a guide rail body, a driving wheel and a driven wheel located at both ends of the guide rail body, and a conveyor belt disposed on the driving wheel and the driven wheel. The first drive assembly is connected to the conveyor belt and is used to drive the cleaning belt to extend or retract (forward or backward). The second drive assembly drives the driving wheel to rotate. The third drive assembly drives the guide rail assembly to move. The third drive assembly is disposed on the mounting assembly.

[0007] According to some preferred embodiments of the invention, the mounting assembly includes a mounting plate and a mounting flange, the third drive assembly is disposed on the mounting plate, and the mounting flange is for connection to the handhole flange of the steam generator.

[0008] According to some preferred embodiments of the present invention, the mounting plate is provided with a mounting groove, and the third driving component is disposed in the mounting groove; a linear guide rail is disposed in the mounting groove, and a mounting bracket is disposed at the end of the guide rail body; the third driving component is used to drive the mounting bracket to move along the linear guide rail.

[0009] According to some preferred embodiments of the present invention, the second drive assembly is disposed on the mounting bracket; the mounting bracket is provided with a tensioning mechanism for driving the drive wheel closer to or away from the end of the guide rail body.

[0010] According to some preferred embodiments of the present invention, the mounting bracket includes a top plate, a bottom plate, and a side plate, and the end of the guide rail body is mounted between the top plate and the bottom plate; the top plate, bottom plate, or side plate is slidably disposed on the linear guide rail, and the bottom plate and the top plate are respectively provided with adjustment holes; the second drive assembly is disposed on the top plate or the bottom plate, and the shaft of the drive wheel passes through the adjustment hole and is connected to the second drive assembly.

[0011] According to some preferred embodiments of the present invention, the tensioning mechanism includes an adjusting plate connected to the drive wheel, an adjusting rod disposed through the side plate, and an adjusting nut sleeved on the adjusting rod, wherein the drive wheel is moved along the adjusting hole by the adjusting rod and the adjusting nut to perform tensioning.

[0012] According to some preferred embodiments of the present invention, the first drive assembly includes a drive wheel, a drive box, an elbow, and a first motor. The drive wheel is disposed inside the drive box, the elbow is disposed on the drive box, the cleaning belt cooperates with the drive wheel and passes through the tube space of the corresponding tube bundle after the elbow, and the first motor is used to drive the drive wheel to rotate.

[0013] Preferably, the cleaning belt is provided with a drive hole, and a drive block is provided on the circumference of the drive wheel to be inserted into the drive hole to drive the cleaning belt to extend and retract.

[0014] According to some preferred embodiments of the present invention, the first drive assembly is connected to a connecting component for connecting to the guide rail assembly. The connecting component includes a fixing plate, a connecting block, and a roller. The fixing plate is connected to the connecting block and fixed on the conveyor belt. The connecting block is connected to the first drive assembly. The roller is disposed on the side of the connecting block near the guide rail body and cooperates with the guide rail.

[0015] According to some preferred embodiments of the invention, the guide rail body includes a receiving groove for the movement of the conveyor belt and a limiting groove for the movement of the roller, the limiting groove being located below the receiving groove.

[0016] According to some preferred embodiments of the present invention, the guide rail body includes a first straight segment, a first curved segment, a second straight segment, or a second curved segment. The first straight segment is connected to the mounting assembly. The first and second curved segments are arc-shaped. The bending direction of the first curved segment is opposite to the bending direction of the cylinder wall of the steam generator, and the bending direction of the second curved segment is the same as the bending direction of the cylinder wall of the steam generator. Preferably, the center of the second curved segment coincides with the center of the cylinder wall of the steam generator. An angle is formed between the tangent of the second curved segment near the end of the first curved segment or between the tangent of the second straight segment and the end of the first curved segment. By setting the angle, after the first drive mechanism moves to a designated position, the cleaning belt can be directly aligned with the tube space of the tube bundle, achieving precise positioning and cleaning. According to some preferred embodiments of the present invention, the angle is 0~15°.

[0017] According to some preferred embodiments of the present invention, a camera is provided at the end of the elbow to observe the end of the cleaning belt and whether it is located exactly between the tubes of the tube bundle.

[0018] Due to the adoption of the above technical solutions, the advantages of the present invention compared with the prior art are as follows: The cleaning device of the present invention for steam generators provides a guide rail adapted to the outer ring corridor of the steam generator, and precisely controls the entry and exit of the cleaning belt into the heat transfer tube space from the outer ring corridor to perform high-pressure cleaning of hard sludge, realizing rapid and precise control of the cleaning belt spray gun head to be aligned with different tube spaces. It has the advantages of simple structure, stable equipment, high reliability, simple installation, convenient operation, high cleaning efficiency, and good effect. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a three-dimensional structural diagram of the cleaning device for a steam generator according to a preferred embodiment of the present invention; Figure 2 This is a top view of the cleaning device for a steam generator according to a preferred embodiment of the present invention; Figure 3 This is a three-dimensional structural diagram of the cleaning device of the steam generator according to a preferred embodiment of the present invention, after the components are concealed. Figure 4 This is a three-dimensional structural diagram of the first drive component in the cleaning device of the steam generator according to a preferred embodiment of the present invention; Figure 5 This is a three-dimensional structural diagram of the connection between the connecting component and the guide rail component in the cleaning device of the steam generator according to a preferred embodiment of the present invention; Figure 6 This is a schematic diagram of the installation structure of the cleaning device on the left side of the steam generator hand hole according to a preferred embodiment of the present invention; Figure 7 This is a schematic diagram of the installation structure of the cleaning device on the right side of the steam generator hand hole, which is a preferred embodiment of the present invention.

[0021] In the attached diagram, the components are: mounting assembly-1, guide rail assembly-2, connecting assembly-3, first drive assembly-4, handhole flange-5, outer ring corridor-6, mounting flange-7, anti-loosening screw-8, third drive assembly-9, linear guide rail-10, mounting bracket-12, second drive assembly-13, driving wheel-15, driven wheel-16, conveyor belt-17, fixing plate-18, roller-19, connecting block-20, connecting cylinder-21, drive box-23, drive wheel-24, elbow-25, cleaning belt-26, camera-27, guide rail body-28, first straight section-281, curved section-282, second straight section-283, mounting plate-29, top plate-31, bottom plate-32, side plate-33, adjusting hole-34, adjusting plate-35, adjusting rod-36, adjusting nut-37, drive block-38, receiving groove-39, and limiting groove-40. Detailed Implementation

[0022] To enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0023] The present invention provides a device that can quickly and accurately deliver a cleaning belt and cleaning gun from the outer ring corridor of a steam generator into the pipe section to the hard sludge location for targeted and efficient cleaning. The device has a simple structure, high reliability, simple installation, convenient operation, and high cleaning efficiency. The cleaning process can be controlled quickly and accurately.

[0024] Specifically, such as Figure 1-7 As shown, the cleaning device for a steam generator in this embodiment includes a mounting assembly 1, a guide rail assembly 2, a first drive assembly 4, a second drive assembly 13, and a third drive assembly 9. The mounting assembly 1 is used to connect the cleaning device to the manhole flange 5 of the steam generator. In use, the guide rail assembly 2 and the first drive assembly 4 thereon extend from the manhole flange 5 into the outer annular space 6.

[0025] The mounting assembly 1 in this embodiment includes a mounting plate 29, a mounting flange 7, and anti-loosening screws 8. The anti-loosening screws 8 are disposed on the mounting flange 7, and the mounting flange 7 is fixedly installed on the manhole flange 5 of the steam generator. The first drive assembly 4 is connected to the guide rail assembly 2, and the second drive assembly 13 and the third drive assembly 9 are located at one end of the guide rail assembly 2. The mounting plate 29 has a mounting groove, and the third drive assembly 9 is disposed in the mounting groove. A linear guide rail 10 is disposed in the mounting groove, and a mounting bracket 12 is disposed at the end of the guide rail body 28. The third drive assembly 9 is used to drive the mounting bracket 12 to move back and forth along the linear guide rail 10, so as to control the guide rail assembly 2 to move back and forth along the linear guide rail 10 within the outer annular corridor 6, so as to maintain the optimal distance between the first drive assembly 4 and the heat transfer tube.

[0026] The guide rail assembly 2 includes a guide rail body 28, a drive wheel 15 and a driven wheel 16 located at both ends of the guide rail body 28, and a conveyor belt 17 disposed on the drive wheel 15 and the driven wheel 16. The drive wheel 15 is located at the head end of the guide rail body 28, and the driven wheel 16 is located at the end of the guide rail body 28. The conveyor belt 17 is disposed on the guide rail body 28 and meshes with the drive wheel 15 and the driven wheel 16. A first drive assembly 4 is connected to the conveyor belt 17. The first drive assembly 4 is used to drive the cleaning belt 26 to extend or retract to enter or exit the tube compartment. A second drive assembly 13 is used to drive the drive wheel 15 to rotate. A third drive assembly 9 is used to drive the guide rail assembly 2 to move.

[0027] The mounting bracket 12 includes a top plate 31, a bottom plate 32, and a side plate 33. The end of the guide rail body 28 is installed between the top plate 31 and the bottom plate 32. The extension of the side plate 33 is slidably mounted on the linear guide rail 10. The bottom plate 32 and the top plate 31 are respectively provided with adjustment holes 34. The second drive assembly 13 is mounted on the top plate 31 or the bottom plate 32. The shaft of the drive wheel 15 passes through the adjustment hole 34 and is connected to the second drive assembly 13.

[0028] Mounting bracket 12 is located at the end of guide rail body 28 and connected to mounting assembly 1 to fix guide rail assembly 2 onto mounting assembly 1. Second drive assembly 13 is located on mounting bracket 12 and is connected to drive wheel 15 to drive conveyor belt 17 to move back and forth.

[0029] The mounting bracket 12 is equipped with a tensioning mechanism, which is used to move the drive wheel 15 closer to or further away from the end of the guide rail body 28 to adjust the tension of the conveyor belt 17. Specifically, the tensioning mechanism includes an adjusting plate 35 connected to the drive wheel 15, an adjusting rod 36 passing through the side plate 33, and an adjusting nut 37 sleeved on the adjusting rod 36. The adjusting rod 36 and the adjusting nut 37 drive the drive wheel 15 to move along the adjusting hole 34 to achieve tension. During the tensioning movement, the second drive assembly 13 moves synchronously.

[0030] The first drive assembly 4 is connected to a connecting assembly 3 for connecting with the guide rail assembly 2. The connecting assembly 3 is installed on the conveyor belt 17 in the guide rail assembly 2 and is used for quick connection with the first drive assembly 4. It drives the first drive assembly 4 to move back and forth with the conveyor belt 17. The first drive assembly 4 is used to observe and drive the cleaning belt 26 to enter and exit the hard mud in the heat transfer tube for fixed-point high-pressure cleaning.

[0031] In this embodiment, the connecting component 3 includes a fixing plate 18, a connecting block 20, and a roller 19. The fixing plate 18 is connected to and fixed on the conveyor belt 17 with the connecting block 20. The connecting block 20 is connected to the first drive component 4. The roller 19 is located on the side of the connecting block 20 near the guide rail body 28 and cooperates with the guide rail to reduce the moving resistance of the connecting block 20. After the connecting block 20 is connected to the first drive component 4 through a quick-connect pin, it drives the first drive component 4 to move back and forth, and the height can be adjusted as needed.

[0032] The first drive assembly 4 includes a drive wheel 24, a drive box 23, an elbow 25, a connecting cylinder 21, and a first motor. One end of the connecting cylinder 21 is connected to the lower part of the connecting block 20 via a quick-connect pin, fixing the first drive assembly 4 to the connecting block 20 and the fixing plate 18, allowing it to move along the guide rail body 28. The first motor is located inside the connecting cylinder 21 and is used to drive the drive wheel 24 to rotate. The motor encoder sets and acquires the in-and-out distance of the cleaning belt 26. The drive box 23 is fixedly connected to the lower end of the connecting cylinder 21. The drive wheel 24 is located inside the drive box 23, and the elbow 25 is located on the drive box 23, pressing the cleaning belt 26 to engage with the drive wheel 24. The structure and curvature of the elbow 25 allow it to pass through the hand hole and the outer annular corridor 6 to reach the lower edge of the inner circumference plate of the steam generator, ensuring that the cleaning belt 26 is directly opposite the pipe section after passing through the elbow 25.

[0033] The cleaning belt 26 is provided with a drive hole, and a drive block 38 is provided on the circumference of the drive wheel 24 to be inserted into the drive hole to drive the cleaning belt 26 to extend and retract. After exiting the bend 25, the cleaning belt 26 is parallel to the direction between the pipes. A camera 27 is provided above the end of the bend 25 to observe the end of the cleaning belt 26 and whether it is located exactly between the pipes of the tube bundle.

[0034] The guide rail body 28 includes a receiving groove 39 for the conveyor belt 17 to move and a limiting groove 40 for the roller 19 to move. The limiting groove 40 is located below the receiving groove 39. Limiting grooves 40 are provided on both sides of the guide rail body 28.

[0035] The guide rail body 28 has an arc-shaped curved structure and can be arranged in the outer annular corridor 6 through a hand hole to provide a fixed alignment path between the heat transfer tubes for the first drive assembly 4. In this embodiment, the guide rail body 28 includes a first straight segment 281, a curved segment 282, and a second straight segment 283. The first straight segment 281 is connected to the mounting assembly 1, and the curved segment 282 is arc-shaped, with its bending direction opposite to the bending direction of the steam generator's cylinder wall. An angle is formed between the tangent at the end of the second straight segment 283 and the curved segment 282. By setting this angle, after the first drive mechanism moves to a designated position, the cleaning belt 26 can be directly aligned with the tubes of the tube bundle, achieving precise positioning and cleaning. The preferred angle is 0~15°.

[0036] In other embodiments, the curved segment is a first curved segment, and the second straight segment 283 is replaced by a second curved segment. The bending direction of the second curved segment is the same as the bending direction of the steam generator cylinder wall, and preferably the center of the circle corresponding to the second curved segment coincides with the center of the circle corresponding to the steam generator cylinder wall. The tangent of the second curved segment near the end of the first curved segment has an angle of 0 to 15° with the tangent of the end of the first curved segment.

[0037] like Figure 6-7 As shown, the cleaning device for the steam generator in this embodiment includes two types of guide rail bodies 28, which have opposite bending directions. One type of guide rail body 28 is bent to the left and installed on the outer annular corridor 6 on the left side of the steam generator's handhole. Figure 6 Another type of guide rail body 28 is bent to the right and installed on the outer ring corridor 6 on the right side of the steam generator manhole. Figure 7 The guide rail body 28 can be replaced depending on the usage environment.

[0038] The present invention relates to a precise and flexible cleaning device for hard sludge on the secondary side of a steam generator. Unlike existing cleaning methods that are installed in the central pipe gallery and driven by linear guide rails, this device, by designing the guide rails as curved structures, achieves for the first time a method of installing guide rail assemblies in the outer ring gallery of the steam generator. This method drives the cleaning belt from the outer ring gallery into the pipe space for high-pressure, targeted cleaning. This method only needs to extend into the first 10 rows of pipes near the center of the central pipe gallery to cover almost all the hard sludge, resulting in high cleaning efficiency. The cleaning belt gun enters along the top of the tube sheet at a height close to the hard sludge, with a small drop. The precise location of the gun head in the hard sludge can be confirmed by the length of the cleaning belt extending into the pipe space, and the cleaning angle is always kept perpendicular to the tube sheet. In addition, compared with existing flexible cleaning devices driven by linear guide rails in the central pipe gallery, this invention does not require a cleaning belt flipping mechanism and can determine with high precision and speed whether the cleaning belt spray nozzle has reached the position of hard mud. The overall structure is simple, the function is reliable, the operation is convenient, and the cleaning efficiency is high. Compared with existing cleaning belt cleaning devices driven by climbing trolleys in the outer ring corridor, this device is stable, can quickly and accurately control the cleaning belt spray nozzle to align with different pipes, and has advantages such as simple structure, high reliability, simple installation, and convenient operation.

[0039] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A cleaning device suitable for steam generators, characterized in that, The device includes an installation assembly, a guide rail assembly, a first drive assembly, a second drive assembly, and a third drive assembly. The installation assembly connects the cleaning device to the steam generator. The guide rail assembly includes a guide rail body, a drive wheel and a driven wheel located at both ends of the guide rail body, and a conveyor belt mounted on the drive wheel and the driven wheel. The first drive assembly is connected to the conveyor belt and is used to drive the cleaning belt to move. The second drive assembly drives the drive wheel to rotate. The third drive assembly drives the guide rail assembly to move and is mounted on the installation assembly. The mounting assembly includes a mounting plate and a mounting flange. The third drive assembly is disposed on the mounting plate, and the mounting plate has a mounting groove. The third drive assembly is disposed in the mounting groove. A linear guide rail is disposed in the mounting groove, and a mounting bracket is disposed at the end of the guide rail body. The third drive assembly is used to drive the mounting bracket to move along the linear guide rail. The first drive assembly includes a drive wheel, a drive box, an elbow, and a first motor. The drive wheel is disposed inside the drive box, the elbow is disposed on the drive box, the cleaning belt passes through the elbow and cooperates with the drive wheel, and the first motor is used to drive the drive wheel to rotate. The first drive assembly is connected to a connecting component for connecting to the guide rail assembly. The connecting component includes a fixing plate, a connecting block, and a roller. The fixing plate is connected to the connecting block and fixed on the conveyor belt. The connecting block is connected to the first drive assembly. The roller is disposed on the side of the connecting block near the guide rail body and cooperates with the guide rail body. The guide rail body includes a receiving groove for the conveyor belt to move and a limiting groove for the roller to move, the limiting groove being located below the receiving groove; The guide rail body includes a first straight segment, a first curved segment, a second straight segment, and a second curved segment. The first straight segment is connected to the mounting assembly. The first and second curved segments are arc-shaped. The bending direction of the first curved segment is opposite to the bending direction of the cylinder wall of the steam generator, and the bending direction of the second curved segment is the same as the bending direction of the cylinder wall of the steam generator. There is an angle between the tangent of the second curved segment near the end of the first curved segment or the tangent of the second straight segment and the end of the first curved segment.

2. The cleaning device according to claim 1, characterized in that, The mounting flange is used to connect to the handhole flange of the steam generator.

3. The cleaning device according to claim 1, characterized in that, The second drive component is mounted on the mounting bracket; the mounting bracket is provided with a tensioning mechanism, which is used to drive the drive wheel to move closer to or away from the end of the guide rail body.

4. The cleaning device according to claim 3, characterized in that, The mounting bracket includes a top plate, a bottom plate, and a side plate. The end of the guide rail body is installed between the top plate and the bottom plate. The top plate, bottom plate, or side plate is slidably disposed on the linear guide rail. The bottom plate and the top plate are respectively provided with adjustment holes. The second drive assembly is disposed on the top plate or the bottom plate. The shaft of the drive wheel passes through the adjustment hole and is connected to the second drive assembly.

5. The cleaning device according to claim 4, characterized in that, The tensioning mechanism includes an adjusting plate connected to the drive wheel, an adjusting rod that passes through the side plate, and an adjusting nut sleeved on the adjusting rod. The adjusting rod and the adjusting nut drive the drive wheel to move along the adjusting hole to perform tensioning.

6. The cleaning apparatus according to claim 1, characterized in that, The included angle is 0~15°.

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