Pipeline inner wall cleaning device and simulation system for operation under swinging working condition of pipeline inner wall cleaning device

Abstract

The utility model provides a pipeline inner wall cleaning device and a simulation system for operation under a swing working condition thereof, and relates to the technical field of pipeline cleaning. The at least one ultrasonic transducer is fixed on the pipeline through a clamping jig; the ultrasonic generator is electrically connected with the ultrasonic transducer; the at least one detection probe is arranged towards the pipeline; and the control module is electrically connected with the detection probe, the ultrasonic generator and the ultrasonic transducer. The simulation system comprises a pipeline inner wall cleaning device and a simulation pipeline section; the two end sealing plates are respectively fixed on the openings at the two ends of the simulation pipeline section in a sealing manner so as to form a closed cavity in the simulation pipeline section; and the swinging platform device is fixedly connected with the simulation pipeline section through a movable platform. The purpose of efficiently cleaning the inner wall of the pipeline through the ultrasonic coupling cleaning medium is achieved, the use requirement for cleaning the inner wall of the related pipeline of the nuclear power unit under the swing working condition can be met, and mechanical damage to the pipeline cannot be caused.

Description

Technical Field

[0001] This application relates to the field of pipeline cleaning technology, specifically to a pipeline inner wall cleaning device and a simulation system for operation under swaying conditions. Background Technology

[0002] During the operation of a nuclear power unit, the activated corrosion products generated in the reactor core migrate with the coolant to the primary loop related systems and are deposited on the inner surfaces of pipes and valves in various forms. Areas where these corrosion products are concentrated can form radioactive hotspots or radioactive heat pipe sections, which will significantly increase the contact dose rate and environmental dose rate at these locations. This is the main source of radiation dose received by nuclear power plant workers during maintenance.

[0003] Traditional methods for decontaminating the inner walls of pipelines in nuclear power units typically include mechanical and chemical cleaning. However, these methods are often ineffective under swaying conditions. Mechanical cleaning may become less efficient due to vibrations caused by swaying, and could even damage the inner walls of the pipelines. Chemical cleaning, on the other hand, may be affected by the hydrodynamic characteristics under swaying conditions, leading to uneven distribution of the liquid chemical cleaning medium and thus affecting the decontamination effect. Utility Model Content

[0004] This application provides a pipeline inner wall cleaning device and a simulation system for operation under swaying conditions, addressing the technical problems of existing pipeline inner wall cleaning devices being unsuitable for operation under swaying conditions, exhibiting low cleaning efficiency and poor results, and easily causing pipeline damage. The pipeline inner wall cleaning device provided in this application achieves highly efficient cleaning of the pipeline inner wall using ultrasonically coupled cleaning media, meeting the usage requirements for pipeline inner wall cleaning operations in nuclear power units under swaying conditions, without causing mechanical damage to the pipeline.

[0005] In some embodiments of this application, a pipe inner wall cleaning device is provided for cleaning the dirt adhering to and deposited on the inner wall of radioactive hot spots or radioactive heat pipe sections of related pipelines of nuclear power units, which contains contaminants such as corrosion products and radionuclides. The pipe inner wall cleaning device includes:

[0006] The cleaning medium is a liquid cleaning medium, which fills the pipe.

[0007] At least one ultrasonic transducer is fixed to the outer wall of the pipe by a clamping fixture to emit ultrasonic waves into the pipe and the cleaning medium by high-frequency vibration.

[0008] An ultrasonic generator is electrically connected to the ultrasonic transducer.

[0009] At least one detection probe is positioned toward the pipe to detect the dose of a radionuclide in the pipe;

[0010] The control module is electrically connected to the detection probe, the ultrasonic generator, and the ultrasonic transducer to control the operation of the ultrasonic generator and the ultrasonic transducer based on the detection results of the detection probe.

[0011] In some embodiments, at least a portion of the ultrasonic transducers are arranged axially along the pipe; and / or at least a portion of the ultrasonic transducers are arranged circumferentially around the pipe;

[0012] And / or, at least some of the detection probes are arranged along the axial direction of the pipe, and / or at least some of the detection probes are arranged circumferentially around the pipe.

[0013] In some embodiments, at least one detection probe is provided within the operating range of each ultrasonic transducer, and the control module independently controls the operation of the corresponding ultrasonic transducer based on the detection results of the detection probe.

[0014] In some embodiments, the ultrasonic transducer includes:

[0015] A first reflective unit and a second reflective unit, wherein the first reflective unit is fixedly connected to the clamping fixture and indirectly contacts the pipeline through the clamping fixture;

[0016] A piezoelectric ceramic sheet is abutted against the end of the first reflective unit facing away from the pipe;

[0017] An electrode assembly is fixedly clamped between the second reflective unit and the piezoelectric ceramic sheet, and the electrode assembly is electrically connected to the ultrasonic generator and the control module;

[0018] Fasteners are used to lock and fix the second reflective unit, electrode assembly, piezoelectric ceramic sheet, and first reflective unit in the axial direction.

[0019] In some embodiments, the electrode assembly includes a positive electrode sheet, an insulating block, and a negative electrode sheet, wherein the insulating block is fixedly clamped between the positive electrode sheet and the negative electrode sheet.

[0020] In some embodiments, the clamping fixture includes:

[0021] The first clamping part is movably abutted against half of the outer wall of the pipe in the circumferential direction;

[0022] The second clamping part is movably abutted against the other half of the outer wall of the pipe in the circumferential direction. One end of the second clamping part in the radial direction of the pipe is movably connected to the same end of the first clamping part through a hinge. The other end of the second clamping part in the radial direction of the pipe is fixedly connected to the same end of the first clamping part through a locking member.

[0023] At least one mounting platform is disposed along the tangential direction of the outer wall of the pipe on the side of the first clamping part and / or the second clamping part facing away from the pipe, and the ultrasonic transducer is fixedly connected to the mounting platform along the radial direction of the pipe.

[0024] In some embodiments, the cleaning medium is an environmentally friendly cleaning solution.

[0025] In some embodiments, the pipe wall cleaning device further includes:

[0026] Vibration feedback sensors are provided in the same number as the ultrasonic transducers and are positioned close to the corresponding ultrasonic transducers. The vibration feedback sensors are electrically connected to the ultrasonic generator to detect the vibration state of the corresponding ultrasonic transducer and output a feedback signal to the ultrasonic generator.

[0027] The ultrasonic generator independently adjusts the excitation voltage signal output to the corresponding ultrasonic transducer based on the feedback signal from the vibration feedback sensor, so that the ultrasonic transducer operates under the set vibration parameters.

[0028] In some embodiments, the pipe wall cleaning device further includes:

[0029] The host computer has a display module and an operation module. The control module is located in the host computer and is electrically connected to the display module and the operation module respectively.

[0030] In some embodiments of this application, a simulation system is provided for the operation of a pipe inner wall cleaning device under oscillating conditions. The simulation system includes the pipe inner wall cleaning device as described in any of the above embodiments, and...

[0031] A simulated pipe segment is configured to be identical to a segment of the stated pipe;

[0032] Two end-sealing plates are respectively sealed and fixed to the openings at both ends of the simulated pipe section to form a sealed chamber inside the simulated pipe section;

[0033] A swing platform device is fixedly connected to the simulated pipe section via a movable platform having at least three degrees of freedom swing amplitude to simulate the swing state of the pipe;

[0034] The cleaning medium is filled in the chamber; the ultrasonic transducer is fixed to the outer wall of the simulated pipe by the clamping fixture to emit ultrasonic waves into the simulated pipe section and the cleaning medium by high-frequency vibration; the detection probe is set towards the simulated pipe section.

[0035] The pipe inner wall cleaning device provided in this application uses a clamping fixture to fix at least one ultrasonic transducer to the outer wall of the pipe. Under the control of the control module, the ultrasonic generator outputs an excitation voltage signal with adjustable frequency and voltage to each ultrasonic transducer, controls the ultrasonic transducer to vibrate at high frequency and emit ultrasonic waves into the pipe and the cleaning medium, thereby using the high-frequency vibration of the ultrasonic waves to break the bonding force between the stubborn dirt containing pollutants such as corrosion products and radioactive nuclides and the inner wall of the pipe, and promotes the loosening and disintegration of the dirt.

[0036] Meanwhile, this application utilizes ultrasonic waves to excite the liquid cleaning medium, causing it to produce acoustic cavitation. The generated cavitation bubbles then promote the impact and penetration of the liquid cleaning medium on stubborn dirt, thereby improving the cleaning effect of the cleaning medium on the dirt on the inner wall of the pipe.

[0037] In addition, this application utilizes a detection probe to detect the content of radioactive nuclides in the pipeline in real time, enabling the control module to control the operation of the ultrasonic transducer according to the cleanliness status of the pipeline, thereby realizing online automated control of pipeline cleaning operations.

[0038] In summary, the pipeline inner wall cleaning device provided in this application achieves efficient cleaning of the pipeline inner wall by ultrasonic coupled cleaning medium and online automated control of pipeline cleaning operations. It has high cleaning efficiency and good effect, and can meet the usage requirements of pipeline inner wall cleaning operations in nuclear power units under swaying conditions. Moreover, the ultrasonic cleaning method will not cause any mechanical damage to the pipeline itself, reducing the risk of pipeline leakage. Attached Figure Description

[0039] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:

[0040] Figure 1 This is a schematic diagram of the overall structure of a specific embodiment of the pipe inner wall cleaning device of this application;

[0041] Figure 2 This is a circuit block diagram of a specific embodiment of the pipe inner wall cleaning device of this application;

[0042] Figure 3 This is a schematic cross-sectional view of an ultrasonic transducer mounted on a pipe using a clamping fixture, according to a specific embodiment of the pipe inner wall cleaning device of this application.

[0043] Figure 4 for Figure 3Enlarged schematic diagram of the local structure at point A;

[0044] Figure 5 This is a schematic diagram of the simulated system structure of the pipe inner wall cleaning device under oscillating conditions.

[0045] In the diagram: 100 - Pipe inner wall cleaning device; 200 - Pipe;

[0046] 1-Ultrasonic generator; 2-Ultrasonic transducer; 21-First reflection unit; 211-Fasting screw hole; 22-Piezoelectric ceramic sheet; 23-Electrode assembly; 231-Positive electrode sheet; 232-Insulating block; 233-Negative electrode sheet; 24-Second reflection unit; 241-Fasting hole; 25-Fastener; 3-Detection probe; 31-Fixed bracket; 4-Host computer; 42-Display module; 43-Operation module; 5-Clamping fixture; 51-First clamping part; 52-Second clamping part; 53-Mounting platform; 54-Hinge; 55-Locking part; 6-Vibration feedback sensor; 7-End plate; 8-Swing platform device; 81-Fixed platform; 82-Hinge assembly; 83-Drive assembly; 84-Moving platform; 85-Control mechanism; 9-Pipe clamp; 10-Simulated pipe section; 101-Cleaning medium. Detailed Implementation

[0047] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application. Furthermore, the features, operations, or characteristics described in the specification can be combined in any suitable manner to form various implementations. At the same time, the steps or actions in the method description can also be rearranged or adjusted in a manner obvious to those skilled in the art. Therefore, the various orders in the specification and drawings are only for clearly describing a particular embodiment and do not imply a necessary order, unless otherwise stated that a certain order must be followed.

[0048] Please see Figures 1 to 4 In some embodiments of this application, a pipe inner wall cleaning device 100 is provided. This pipe inner wall cleaning device 100 can be used in the cleaning operation of the inner wall of the radioactive hotspots or radioactive heat pipe sections of the relevant pipes 200 of a nuclear power unit, so as to remove the corrosion products and radioactive nuclides (such as...) that are attached to and deposited on the inner wall of the pipe 200. 60Cleaning of contaminants such as Co. The pipe inner wall cleaning device 100 includes a cleaning medium 101, at least one ultrasonic transducer 2, an ultrasonic generator 1, at least one detection probe 3, and a control module 41. The cleaning medium 101 is a liquid cleaning medium with cleaning function, and the liquid cleaning medium is filled in the pipe 200.

[0049] The ultrasonic transducer 2 is fixed to the outer wall of the pipe 200 by the clamping fixture 5, so as to emit ultrasonic waves into the pipe 200 and the cleaning medium 101 filled in the pipe 200 by high-frequency vibration.

[0050] The ultrasonic generator 1 is located outside the pipe 200, and the ultrasonic generator 1 is electrically connected to all the ultrasonic transducers 2.

[0051] The detection probe 3 is positioned toward the pipe 200 to detect the content of radionuclides in the pipe 200.

[0052] The control module 41 is located outside the pipe 200 and is electrically connected to the ultrasonic generator 1, ultrasonic transducer 2 and detection probe 3 mentioned above, so as to control the operation of the ultrasonic generator 1 and ultrasonic transducer 2 based on the detection result of the detection probe 3.

[0053] Each clamping fixture 5 may be equipped with only one ultrasonic transducer 2, or two or more ultrasonic transducers 2 may be installed simultaneously. This application does not limit this, as long as it can meet the cleaning requirements of the inner wall of the pipe 200.

[0054] The liquid cleaning medium can be water or a cleaning solution containing natural or non-natural cleaning ingredients that meets the cleaning requirements of the inner wall of pipe 200. This application does not limit the type of cleaning medium as long as it meets the cleaning requirements of the inner wall of pipe 200.

[0055] Radionuclides 60 Co releases radioactive radiation, including gamma rays, during its decay process. The detection probe 3 utilizes its own response to these gamma rays to detect the radiation in pipe 200 in real time. 60 The presence of Co nuclides and their radiation dose, absorption 60 Co emits gamma rays and converts them into measurable detection electrical signals. These signals are then transmitted efficiently and in real time to the control module 41 via an RS485 signal line. The control module 41 amplifies, shapes, counts, and processes the detection signals to generate real-time detection result data. Based on this data, the control module 41 controls the operation of the ultrasonic generator 1 and the ultrasonic transducer 2.

[0056] The detection probe 3 can be a scintillation detector, semiconductor detector, Geiger-Miller counter, or other devices capable of detecting radioactive radiation such as gamma rays. The detection probe 3 can be fixed to the outer wall of the pipe 200 or installed detached from the pipe 200. This application does not limit this, as long as it can meet the detection requirements of radioactive nuclides within the pipe 200.

[0057] The pipe inner wall cleaning device 100 provided in this application fixes at least one ultrasonic transducer 2 to the outer wall of a pipe 200, particularly to the outer wall of a radioactive hot spot or radioactive heat pipe section of the pipe 200, using a clamping fixture 5. Under the control of the control module 41, the ultrasonic generator 1 outputs an adjustable excitation voltage signal to each ultrasonic transducer 2, controlling the ultrasonic transducer 2 to vibrate at high frequency and emit ultrasonic waves into the pipe 200 and the cleaning medium 101. The ultrasonic waves are reflected by the inner wall of the pipe 200, forming a strong impact on the inner wall of the pipe 200. The high-frequency vibration of the ultrasonic waves breaks down the bonding force between the stubborn dirt containing pollutants such as corrosion products and radionuclides and the inner wall of the pipe 200, causing the dirt to loosen and disintegrate.

[0058] Meanwhile, this application utilizes ultrasonic waves to excite the liquid cleaning medium to generate acoustic cavitation, thereby using the generated cavitation bubbles to promote the impact and penetration of the liquid cleaning medium on stubborn dirt, thus improving the cleaning effect of the cleaning medium 101 on the dirt on the inner wall of the pipe 200.

[0059] In addition, this application utilizes the detection probe 3 to detect the content of radioactive nuclides in the pipeline 200 in real time, so that the control module 41 can control the operation of the ultrasonic transducer 2 according to the cleanliness status in the pipeline 200, thereby realizing online automated control of the pipeline 200 cleaning operation.

[0060] In summary, the pipe inner wall cleaning device 100 provided in this application achieves the goal of efficient cleaning of the inner wall of the pipe 200 by the ultrasonic coupled cleaning medium 101 and online automated control of the pipe 200 cleaning operation. It has high cleaning efficiency and good effect, and can meet the usage requirements of the relevant pipe inner wall cleaning operation of nuclear power units under swaying conditions. Moreover, the ultrasonic cleaning method will not cause any mechanical damage to the pipe 200 itself, reducing the risk of leakage of the pipe 200.

[0061] In some embodiments, under the control of the control module 41, the ultrasonic generator 1 outputs an adjustable excitation voltage signal to each ultrasonic transducer 2 using PWM wave and PID control technology, controlling each ultrasonic transducer 2 to vibrate at a high frequency of 20kHz-40kHz. The 20kHz-40kHz frequency range falls within the low-frequency range of ultrasonic frequencies. The lower the ultrasonic frequency, the lower the excitation threshold for liquid cavitation; that is, the lower the acoustic intensity or power required to generate cavitation in the liquid cleaning medium, making it easier to excite acoustic cavitation in the liquid cleaning medium. Furthermore, at low frequencies, the time interval between compression and stretching of the liquid cleaning medium is longer, allowing cavitation bubbles to grow to a larger size before collapsing, significantly enhancing the intensity of the generated cavitation bubbles and further improving the cleaning effect.

[0062] In some embodiments, the ultrasonic generator 1 controls each ultrasonic transducer 2 to vibrate at a frequency of 20kHz-25kHz, which can further reduce the acoustic intensity or acoustic power required for the acoustic cavitation of the liquid cleaning medium, which is conducive to exciting the acoustic cavitation phenomenon of the liquid cleaning medium. While reducing power consumption, it promotes the impact and penetration of the liquid cleaning medium on the dirt attached to the inner wall of the pipe 200, thereby improving the cleaning efficiency and cleaning effect of the inner wall of the pipe 200.

[0063] In some embodiments, at least some of the ultrasonic transducers 2 are arranged along the axial direction of the pipe 200, either in a straight line or in a curve. The distance between adjacent ultrasonic transducers 2 in the axial direction of the pipe 200 can be the same or different.

[0064] In some embodiments, at least some of the ultrasonic transducers 2 are arranged circumferentially around the pipe 200, and the distance between adjacent ultrasonic transducers 2 in the circumferential direction of the pipe 200 may be the same or different.

[0065] In some embodiments, at least some of the ultrasonic transducers 2 are arranged axially along the pipe 200, and at least some of the ultrasonic transducers 2 are arranged circumferentially around the pipe 200.

[0066] By adopting the above technical solution, the ultrasonic transducer 2 can be arranged at any position in the axial and circumferential directions of the pipeline 200, so as to adapt the ultrasonic transducer 2 to the actual situation of dirt adhering to the inner wall of different sections of the pipeline 200, thereby meeting the overall cleaning requirements of the pipeline 200.

[0067] In some embodiments, at least some of the detection probes 3 are arranged along the axial direction of the pipe 200, either in a straight line or in a curve. The distance between adjacent detection probes 3 in the axial direction of the pipe 200 can be the same or different.

[0068] In some embodiments, at least some of the detection probes 3 are arranged circumferentially around the pipe 200, and the distance between adjacent detection probes 3 in the circumferential direction of the pipe 200 may be the same or different.

[0069] In some embodiments, at least some of the detection probes 3 are arranged axially along the pipe 200, and at least some of the detection probes 3 are arranged circumferentially around the pipe 200.

[0070] By adopting the above technical solution, the detection probe 3 can be arranged at any position in the axial and circumferential directions of the pipeline 200, so as to adapt the detection probe 3 to the actual situation of dirt adhering to the inner wall of different sections of the pipeline 200, thereby meeting the overall cleaning requirements of the pipeline 200.

[0071] Please see Figure 1 In some embodiments, at least one detection probe 3 is provided within the operating range of each ultrasonic transducer 2. The control module 41 independently controls the operation of the corresponding ultrasonic transducer 2 based on the detection results of these detection probes 3. This method ensures that there is at least one detection probe 3 within the operating range of each ultrasonic transducer 2, so as to use these detection probes 3 to detect the cleaning effect of the corresponding ultrasonic transducer 2, and enables the control module 41 to independently control the operation of the corresponding ultrasonic transducer 2 according to the actual cleaning situation of different sections and positions of the pipeline 200.

[0072] During the cleaning process, when the detection probe 3 detects a radioactive dose in a certain section of pipe 200 that exceeds a preset dose threshold, the control module 41 controls the corresponding ultrasonic transducer 2 in that section of pipe 200 to continue operating via the ultrasonic generator 1, thereby continuing to clean the inner wall of that section of pipe 200. When the detection probe 3 detects a radioactive dose in a certain section of pipe 200 that is less than the preset dose threshold, the control module 41 controls the corresponding ultrasonic transducer 2 in that section of pipe 200 to stop operating via the ultrasonic generator 1. This continues until all detection probes 3 detect radioactive doses in their respective sections of pipe 200 that are less than the preset dose threshold, at which point the control module 41 controls the ultrasonic generator 1 to stop operating.

[0073] Please see Figure 3 and Figure 4In some embodiments, the ultrasonic transducer 2 includes a first reflecting unit 21, a second reflecting unit 24, a piezoelectric ceramic sheet 22, an electrode assembly 23, and a fastener 25. The first reflecting unit 21 is fixedly connected to a clamping fixture 5 and indirectly contacts the pipe 200 through the clamping fixture 5. The piezoelectric ceramic sheet 22 abuts against the end of the first reflecting unit 21 facing away from the pipe 200. The electrode assembly 23 is fixedly clamped between the second reflecting unit 24 and the piezoelectric ceramic sheet 22, and is electrically connected to the ultrasonic generator 1 and the control module 41. The fastener 25 locks and fixes the second reflecting unit 24, the electrode assembly 23, the piezoelectric ceramic sheet 22, and the first reflecting unit 21 axially.

[0074] The first reflective unit 21 is preferably made of stainless steel and is shaped like a frustum. It abuts against and is fixedly connected to the clamping fixture 5 through its relatively larger bottom surface. The piezoelectric ceramic sheet 22 abuts against the relatively smaller top surface of the first reflective unit 21. The first reflective unit 21 is provided with a fastening screw hole 211, which is recessed from the center of the top surface of the first reflective unit 21.

[0075] Correspondingly, the dimensions of the piezoelectric ceramic sheet 22 and the electrode assembly 23 are preferably set to match the top surface dimensions of the first reflective unit 21, and the piezoelectric ceramic sheet 22 and the electrode assembly 23 are both provided with through holes (not shown) for the insertion of fasteners 25 along their central axes.

[0076] The second reflective unit 24 is preferably made of aluminum alloy and is cylindrical in shape. The dimensions of its end face are preferably matched with the dimensions of the top face of the first reflective unit 21. A fastening hole 241 is provided through the central axis of the second reflective unit 24. The fastening hole 241 is preferably a countersunk hole. The fastener 25 is a fastening screw that passes through the countersunk hole, through the through holes on the electrode assembly 23 and the piezoelectric ceramic sheet 22, and is threadedly connected to the fastening screw hole 211 on the first reflective unit 21.

[0077] In use, the ultrasonic generator 1 outputs a high-frequency excitation voltage signal with a set frequency and power, which has been amplified, to the electrode assembly 23. The set frequency is generally matched with the natural frequency of the piezoelectric ceramic sheet 22. When the high-frequency excitation voltage signal is applied to the electrode sheet, the polarization direction inside the piezoelectric ceramic sheet 22 will change periodically due to the action of the electric field, thereby driving the piezoelectric ceramic sheet 22 to generate high-frequency mechanical vibration. This high-frequency vibration is then transmitted to the pipe 200 and the cleaning medium filled in the pipe 200 through the first reflection unit 21 and the clamping fixture 5.

[0078] The first reflective unit 21 can be connected to the clamping fixture 5 by adhesive bonding or by a combination of threaded fastening and adhesive bonding.

[0079] Please see Figure 4 In some embodiments, the electrode assembly 23 includes a positive electrode sheet 231, an insulating block 232, and a negative electrode sheet 233, with the insulating block 232 fixedly clamped between the positive electrode sheet 231 and the negative electrode sheet 233.

[0080] Both the positive electrode 231 and the negative electrode 233 are preferably made of pure copper, and the insulating block 232 is preferably made of hard rubber with a certain deformation capability. The insulating block 232 is used to isolate the positive electrode 231 and the negative electrode 233 to prevent the positive and negative electrode plates from short-circuiting due to contact.

[0081] The ultrasonic transducer 2 of the pipeline inner wall cleaning device 100 of this application has a simple overall structure, few components, convenient installation, and low cost, and can meet the needs of cleaning the inner wall of nuclear pipelines 200.

[0082] Please see Figure 3 In some embodiments, the clamping fixture 5 includes a first clamping part 51, a second clamping part 52, and at least one mounting platform 53. The first clamping part 51 is movably abutted against half of the outer wall of the pipe 200 in the circumferential direction. The second clamping part 52 is movably abutted against the other half of the outer wall of the pipe 200 in the circumferential direction. The left end of the second clamping part 52 in the radial direction of the pipe 200 is movably connected to the left end of the first clamping part 51 via a hinge 54, and the right end of the second clamping part 52 in the radial direction of the pipe 200 is fixedly connected to the right end of the first clamping part 51 via a locking member 55.

[0083] The mounting platform 53 is disposed along the tangent direction of the outer wall of the pipe 200 on the side of the first clamping part 51 facing away from the pipe 200, or the mounting platform 53 is disposed along the tangent direction of the outer wall of the pipe 200 on the side of the second clamping part 52 facing away from the pipe 200, or the mounting platform 53 is disposed along the tangent direction of the outer wall of the pipe 200 on the side of the first clamping part 51 and the second clamping part 52 facing away from the pipe 200 respectively. Each clamping fixture 5 is provided with at least one mounting platform 53, and at least one ultrasonic transducer 2 is fixedly connected through at least one mounting platform 53. As to whether the mounting platform 53 is specifically disposed on the first clamping part 51, the second clamping part 52, or both the first clamping part 51 and the second clamping part 52, this application does not limit this, as long as it meets the installation and use requirements of the ultrasonic transducer 2.

[0084] The ultrasonic transducer 2 is fixedly connected to the mounting platform 53 along the radial direction of the pipe 200, which ensures that the vibration transmitted by the ultrasonic transducer 2 to the mounting platform 53 can be transmitted into the pipe 200 efficiently and accurately along the radial direction.

[0085] The first clamping part 51 and the second clamping part 52 of the clamping fixture 5 of this application are movably connected at one end by a hinge 54 and fixedly connected at the other end by a locking part 55. This allows the free ends of the first clamping part 51 and the second clamping part 52 to open and close relative to each other in the circumferential direction of the pipe 200 with the hinge as the axis. This facilitates the control of the separation or fixation of the clamping fixture 5 from the pipe 200 and makes it convenient to use. In addition, the clamping fixture 5 of this application has a simple structure and low cost, which helps to reduce the production cost of the pipe inner wall cleaning device 100.

[0086] In some embodiments, the cleaning medium 101 is an environmentally friendly cleaning fluid. The environmentally friendly cleaning fluid has low corrosiveness to the pipeline 200, is environmentally friendly, and facilitates the recycling and treatment of waste liquid after cleaning.

[0087] In one specific embodiment, the environmentally friendly cleaning solution is a binary mixture containing citric acid and malic acid. Citric acid and malic acid have a strong dissolving effect on the corrosion deposits on the surface of the stainless steel pipe 200, and under the excitation of ultrasound, a large number of cavitation bubbles are generated. The instantaneous high temperature and high pressure environment released by the collapse of these cavitation bubbles can promote the dissolution of corrosion deposits attached to the inner wall of the pipe 200 by citric acid and malic acid, significantly improving cleaning efficiency and cleaning effect.

[0088] In actual use, the required mass of cleaning medium 101 needs to be calculated based on the total volume of pipe 200. Preferably, in the binary mixed cleaning solution, the concentration of malic acid solution (MLA) is set at 0.3 mol / L, and the concentration of citric acid solution (CA) is set at 0.15 mol / L. The reaction conditions are: pH = 3, temperature T = 60℃, and reaction time t = 3 min. Cleaning with this cleaning solution formulation results in a high dissolution rate of corrosion deposits adhering to the inner wall of pipe 200, while minimizing corrosion of the stainless steel pipe 200.

[0089] Please see Figure 1 and Figure 2 In some embodiments, the pipe inner wall cleaning device 100 further includes a vibration feedback sensor 6. The vibration feedback sensor 6 is the same number as the ultrasonic transducer 2 and is respectively set close to the corresponding ultrasonic transducer 2. The vibration feedback sensor 6 is electrically connected to the ultrasonic generator 1 to detect the vibration state of the corresponding ultrasonic transducer 2 and output a feedback signal to the ultrasonic generator 1.

[0090] The ultrasonic generator 1 independently adjusts the excitation voltage signal output to the corresponding ultrasonic transducer 2 based on the feedback signal from the vibration feedback sensor 6, so that the ultrasonic transducer 2 operates under the set vibration parameters.

[0091] This application uses a vibration feedback sensor to monitor the vibration state of each ultrasonic transducer 2 in real time. When the vibration state of the ultrasonic transducer 2 becomes abnormal, the excitation voltage signal output by the ultrasonic generator 1 is adjusted in a timely manner to ensure that each ultrasonic transducer 2 can vibrate stably and accurately according to the set frequency and power parameters, thereby realizing the feedback control of the ultrasonic generator 1 for each ultrasonic transducer 2.

[0092] Preferably, the vibration feedback sensor 6 can be integrated into the first reflection unit 21 of the ultrasonic transducer 2, or the vibration feedback sensor 6 can also be set on the mounting platform 53 of the clamping fixture 5 so as to directly detect the vibration state parameters of the ultrasonic transducer 2 through the vibration feedback sensor.

[0093] Please see Figure 1 and Figure 2 In some embodiments, the pipe inner wall cleaning device 100 further includes a host computer 4, which is located outside the pipe 200 and has a display module 42 and an operation module 43. The control module 41 is located inside the host computer 4 and is electrically connected to the display module 42 and the operation module 43 respectively.

[0094] The host computer 4 can be an industrial control computer, or a desktop computer, laptop computer, tablet computer, or other terminal device. This application does not limit it in this regard. It is sufficient that it can control the operation of the ultrasonic generator 1 and the ultrasonic transducer 2 based on the detection electrical signal of the detection probe 3 to meet the cleaning requirements of the inner wall of the pipeline 200.

[0095] The host computer 4 can integrate intelligent control algorithms, such as automatically adjusting the output power or frequency of the ultrasonic generator 1 according to the degree of contamination on the inner wall of the pipe 200, to achieve multi-band combined cleaning of the ultrasonic transducer 2. In addition, to ensure the safety of the cleaning process, the industrial control computer can also be equipped with safety mechanisms such as overload protection and short circuit protection to prevent accidents caused by equipment failure.

[0096] The display module 42 can be configured to display the radionuclide doses collected by all detection probes 3 within the pipe 200 in real time. The control module 41 processes the detection signals fed back by each detection probe 3 through amplification, shaping, and counting circuits, and finally displays the total dose on the display module 42. If the total radionuclide dose detected by the detection probes 3 is equal to or exceeds a preset threshold for initiating cleaning, the control module 41 automatically sends an activation signal to the ultrasonic generator 1, thereby driving the ultrasonic transducer 2 to automatically clean the pipe 200. If the total radionuclide dose detected by the detection probes 3 is equal to or lower than a preset threshold for stopping cleaning, the control module 41 automatically sends a stop signal to the ultrasonic generator 1 to control the ultrasonic transducer 2 to stop operating.

[0097] Users can adjust the preset dose threshold, cleaning time, and ultrasonic power for radionuclide detection through the operation module 43. They can also control the operation of the ultrasonic generator 1 and ultrasonic transducer 2 automatically or manually, and realize the operation terminal functions of data display and parameter setting on the host computer 4.

[0098] In some embodiments, the display module can be a touch screen, and the operation module can be integrated into the touch screen to realize touch operation, which can eliminate the physical operation buttons on the host computer 4 and facilitate touch operation for users.

[0099] Please see Figure 5 In some embodiments of this application, a simulation system is provided for the operation of a pipe inner wall cleaning device 100 under swaying conditions. The simulation system includes the pipe inner wall cleaning device 100 as described above, as well as a simulated pipe section 10, two end caps 7, and a swaying platform device 8. The simulated pipe section 10 can simulate the internal environment of a relevant pipe 200 in a real nuclear power unit, and the swaying platform device 8 can simulate the swaying conditions of the relevant pipe 200 in a nuclear power unit. The simulation system verifies the actual operation of the pipe inner wall cleaning device 100 provided in this application under swaying conditions and examines its actual cleaning effect under swaying conditions.

[0100] The simulated pipe segment 10 is configured to be identical to a segment of any of the pipes 200 described above. This identicalness refers to the fact that the simulated pipe segment 10 and the actual nuclear power unit-related pipes 200 are identical in terms of pipe material, wall thickness, inner diameter, extension path, degree of fouling adhesion, and fouling composition. Preferably, it is configured to be identical to the radioactive heat pipe segment of the pipe 200, thereby ensuring that the internal environment of the simulated pipe segment 10 is the same as that of the actual nuclear power unit-related pipes 200. The specific length of the simulated pipe segment 10 can be set according to the actual needs of the simulation experiment; this application does not impose any limitations on this.

[0101] In this embodiment, the simulated pipe section 10 and the two end plates 7 are made of stainless steel, the same material as the actual pipe 200, which has good acid and alkali resistance and corrosion resistance.

[0102] The simulated pipe section 10 is a tubular structure open at both ends. Two end-sealing plates 7 are respectively sealed and fixed to the two end openings of the simulated pipe section 10 to form a sealed chamber (not shown) inside the simulated pipe section 10. The cleaning medium 101 is filled in the sealed chamber. The cleaning medium 101 is an environmentally friendly cleaning fluid, preferably a binary mixed cleaning fluid of citric acid and malic acid. Preferably, in the binary mixed cleaning fluid, the concentration of malic acid solution (MLA) is prepared to be 0.3 mol / L, and the concentration of citric acid (CA) solution is prepared to be 0.15 mol / L.

[0103] Each end plate 7 is sealed to the simulated pipe section 10 by a sealing ring to prevent the cleaning medium 101 from leaking out from the gap between them.

[0104] The swing platform device 8 is a commercially available multi-degree-of-freedom swing platform device 8, which is fixedly connected to the simulated pipe section 10 through a movable platform 84 with at least three degrees of freedom swing amplitude, in order to simulate the swing state of the real pipe 200 used in nuclear power units.

[0105] At least one ultrasonic transducer 2 is fixed to the outer wall of the simulated pipe 200 by a clamping fixture 5 to emit ultrasonic waves into the simulated pipe section 10 and the binary mixed cleaning fluid by means of high-frequency vibration. At least one detection probe 3 is positioned facing the simulated pipe section 10.

[0106] The swing platform device 8 preferably employs a six-degree-of-freedom swing platform device, which includes a fixed platform 81 and a movable platform 84 arranged opposite to each other, six sets of drive components 83 movably connected between the fixed platform 81 and the movable platform 84 via hinge components 82, and a control mechanism 85 electrically connected to the six sets of drive components 83. The fixed platform 81 is horizontally fixedly installed on the ground or other plane that can support and fix the swing platform device 8. The drive components 83 are preferably electric cylinders, evenly distributed between the fixed platform 81 and the movable platform 84 with the central axis of the fixed platform 81 and the movable platform 84 as the center. The hinge components 82 are preferably Hooke hinges, with two in each set of Hooke hinges. One is movably connected to the telescopic rod of the electric cylinder and the movable platform 84, and the other is movably connected to the cylinder body of the electric cylinder and the fixed platform 81. The control mechanism 85 controls the extension and retraction strokes of the six sets of electric cylinders in a preset working mode, so as to drive the movable platform 84 to swing in six degrees of freedom under the transmission of the Hooke hinges, thereby causing the simulated pipe section 10 fixedly connected thereto to swing.

[0107] The actual simulation operation includes the following steps:

[0108] Configuration of Cleaning Medium 101: Calculate the required mass of environmentally friendly cleaning fluid based on the actual chamber volume of the simulated pipe 200. The preferred environmentally friendly cleaning fluid is a binary mixture containing malic acid and citric acid, with the following concentrations: malic acid solution (MLA) concentration: 0.3 mol / L; citric acid solution (CA) concentration: 0.15 mol / L; reaction conditions: pH = 3; temperature T = 60℃; reaction time t = 3 min. Under these concentration conditions, the binary mixture of malic acid and citric acid exhibits a high dissolution rate for stubborn dirt adhering to the inner wall of pipe 200, while having a relatively low corrosive effect on the stainless steel inner wall of pipe 200.

[0109] Filling with cleaning medium 101: First, seal one end opening of the simulated pipe section 10 with an end cap 7. Then, inject the prepared binary mixed cleaning solution containing malic acid and citric acid into the simulated pipe 200 through the other end opening, so that the binary mixed cleaning solution fills the entire inner cavity of the simulated pipe section 10. Then, seal the other end opening of the simulated pipe section 10 with another end cap 7 to ensure that the cavity of the simulated pipe section 10 is well sealed, so as to prevent leakage from both ends of the simulated pipe section 10 under swaying conditions.

[0110] Assemble the pipe inner wall cleaning device 100: Use the clamping fixture 5 to fix the ultrasonic transducer 2 onto the outer wall of the simulated pipe section 10. In this embodiment, one ultrasonic transducer 2 is used as an example. The ultrasonic transducer 2 is fixed vertically on the upper outer wall of the middle part of the simulated pipe section 10 and has a built-in vibration feedback sensor 6. Use the fixing bracket 31 to fix the detection probe 3 onto the outer wall of the simulated pipe section 10. In this embodiment, two detection probes 3 are used as an example, with the two probes positioned close to the left and right sides of the ultrasonic transducer 2, respectively.

[0111] Before the cleaning operation of pipe 200 begins, the ultrasonic transducer 2 is fixedly connected to the mounting platform 53 of the clamping fixture 5 using epoxy resin. One side of the clamping fixture 5 is movably connected to the first clamping part 51 and the second clamping part 52 via a hinge 54, allowing the first clamping part 51 and the second clamping part 52 of the clamping fixture 5 to be opened from the other side, facilitating the fitting of the clamping fixture 5 onto the outer wall of the simulated pipe 200. After the first clamping part 51 and the second clamping part 52 are closed, two sets of locking members 55 lock and fix the other side of the first clamping part 51 and the second clamping part 52 of the clamping fixture 5, thereby fixing the ultrasonic transducer 2 to the simulated pipe section 10 via the clamping fixture 5.

[0112] Assemble the simulated pipe section 10 and the swaying platform device 8: The simulated pipe section 10, with the ultrasonic transducer 2 and the detection probe 3 installed, is fixedly installed onto the movable platform 84 of the swaying platform device 8 using the pipe clamp 9, so as to simulate the operation process of the pipe inner wall cleaning device 100 under swaying conditions through the swaying platform device 8.

[0113] Electrical connections of related equipment: The control module 41 in the host computer 4 is electrically connected to the ultrasonic generator 1, ultrasonic transducer 2, and detection probe 3 via wired and / or wireless connections. The control module 41 is electrically connected to the display module 42 on the host computer 4 via a display circuit, and also to the operation module 43 on the host computer 4 via a control circuit. The host computer 4 is located outside the simulated pipe section 10 and can be placed on the ground outside the simulated pipe section 10. The display module 42 on the host computer 4 displays the dose values ​​of radionuclides detected by each detection probe 3 in real time. The operation module 43 on the host computer 4 can also adjust the preset threshold value of the radionuclide detection dose for starting and / or stopping cleaning. In addition, the operation of the pipe inner wall cleaning device 100 can also be manually controlled via the operation module 43 on the host computer 4.

[0114] The ultrasonic generator 1 uses a DSP+FPGA+ARM as the system control core, and replaces the traditional IGBT inverter circuit with a MOSFET high-speed full-bridge inverter circuit. A PWM chopper circuit is used to control the power supply output voltage, providing an adjustable excitation voltage signal for the ultrasonic transducer 2. In this embodiment, the ultrasonic cleaning frequency of the ultrasonic transducer 2 is set to 20kHz-25kHz.

[0115] The operation of the simulated pipeline 200 cleaning device under swaying conditions: The swaying platform device 8 is started and operated under the control of the control mechanism 85 to control the six sets of electric cylinders to extend and retract according to the set pattern, thereby driving the movable platform 84 to sway with six degrees of freedom, simulating the actual swaying conditions of the relevant pipelines of the nuclear power unit. The ultrasonic generator 1 is started through the control module 41 of the host computer 4, and the ultrasonic generator 1 is controlled to send an excitation voltage signal to the ultrasonic transducer 2, driving the ultrasonic transducer 2 to vibrate at high frequency and transmit 20kHz-25kHz ultrasonic waves to the simulated pipeline section 10 and the cleaning medium 101 in the simulated pipeline section 10.

[0116] The ultrasonic waves are reflected by the inner wall of the simulated pipe section 10, creating a powerful impact on the inner wall of the pipe 200. The high-frequency vibrations of the ultrasonic waves then break down the bonding force between the magnetic oxides in the stubborn dirt and the inner wall of the pipe 200, causing the dirt to loosen and disintegrate. Simultaneously, the ultrasonic waves excite the liquid cleaning medium in the chamber of the simulated pipe section 10, causing acoustic cavitation. The resulting cavitation bubbles then promote the impact and penetration of the liquid cleaning medium onto the stubborn dirt, thereby achieving the cleaning and decontamination of the inner wall of the simulated pipe section 10.

[0117] To simulate actual swaying conditions, the pre-collected swaying time and amplitude data of the pipeline 200 under real swaying conditions need to be imported into the control software of the control mechanism 85 of the swaying platform device 8. The swaying platform device 8 can operate independently using its own control mechanism 85, or the control mechanism 85 can be connected to the host computer 4, and the control module 41 of the host computer 4 can be used to control the swaying platform device 8.

[0118] During the cleaning process, the display module 42 on the host computer 4 monitors the process, and the dose data of radionuclides within the simulated pipe section 10 is detected in real time by each detection probe 3. If the total dose detected by the detection probe 3 is greater than or equal to the preset threshold value of the radionuclide detection dose for initiating cleaning, the control module 41 automatically sends an activation signal to the ultrasonic generator 1, thereby driving the ultrasonic transducer 2 to vibrate at high frequency to perform high-frequency cleaning of the inner wall of the simulated pipe section 10, achieving automatic cleaning of the pipe 200. If the total dose detected by the detection probe 3 is less than or equal to the preset threshold value of the radionuclide detection dose for stopping cleaning, the control module 41 automatically sends a stop signal to the ultrasonic generator 1, controlling the ultrasonic transducer 2 to stop working.

[0119] After the cleaning operation is completed, the simulated pipe section 10 is removed from the movable platform 84 of the swing platform device 8, at least one end plate 7 is removed and all waste liquid in the chamber is poured out. The inner wall surface of the simulated pipe section 10 is observed and measured. It can be seen that the stubborn dirt attached to the inner wall of the pipe 200 is almost completely removed, which proves that the pipe inner wall cleaning device 100 provided in this application is fully applicable to the cleaning operation of the inner wall of the pipe 200 under swing conditions. Moreover, the cleaning efficiency of the inner wall of the pipe 200 is high and the effect is good. It realizes the online automated cleaning operation and intelligent control of the inner wall of the pipe 200, improves work efficiency and safety, and reduces the radioactive pollution hazards of radioactive materials to nuclear power plant operators and the surrounding production and living environment.

[0120] It is also important to note that the waste liquid poured out from chamber 10 of the simulated pipeline after the simulation experiment must be transferred to a dedicated waste liquid collection tank and handed over to the relevant treatment unit for waste liquid treatment to prevent environmental pollution.

[0121] The above are merely preferred embodiments of this application and do not limit the scope of this patent application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of this application.

Claims

1. A pipe inner wall cleaning device for cleaning the inner wall of a pipe, characterized in that, include: The cleaning medium is a liquid cleaning medium, which fills the pipe. At least one ultrasonic transducer is fixed to the outer wall of the pipe by a clamping fixture to emit ultrasonic waves into the pipe and the cleaning medium by high-frequency vibration. An ultrasonic generator is electrically connected to the ultrasonic transducer. At least one detection probe is positioned toward the pipe to detect the dose of a radionuclide in the pipe; The control module is electrically connected to the detection probe, the ultrasonic generator, and the ultrasonic transducer to control the operation of the ultrasonic generator and the ultrasonic transducer based on the detection results of the detection probe.

2. The pipe inner wall cleaning device according to claim 1, characterized in that, At least some of the ultrasonic transducers are arranged along the axial direction of the pipe; and / or at least some of the ultrasonic transducers are arranged circumferentially around the pipe. And / or, at least some of the detection probes are arranged along the axial direction of the pipe, and / or at least some of the detection probes are arranged circumferentially around the pipe.

3. The pipe inner wall cleaning device according to claim 2, characterized in that, At least one detection probe is provided within the operating range of each ultrasonic transducer, and the control module independently controls the operation of the corresponding ultrasonic transducer based on the detection results of the detection probe.

4. The pipe inner wall cleaning device according to claim 1, characterized in that, The ultrasonic transducer includes: A first reflective unit and a second reflective unit, wherein the first reflective unit is fixedly connected to the clamping fixture and indirectly contacts the pipeline through the clamping fixture; A piezoelectric ceramic sheet is abutted against the end of the first reflective unit facing away from the pipe; An electrode assembly is fixedly clamped between the second reflective unit and the piezoelectric ceramic sheet, and the electrode assembly is electrically connected to the ultrasonic generator and the control module; Fasteners are used to lock and fix the second reflective unit, electrode assembly, piezoelectric ceramic sheet, and first reflective unit in the axial direction.

5. The pipe inner wall cleaning device according to claim 4, characterized in that, The electrode assembly includes a positive electrode sheet, an insulating block, and a negative electrode sheet, with the insulating block fixedly clamped between the positive electrode sheet and the negative electrode sheet.

6. The pipe inner wall cleaning device according to claim 1, characterized in that, The clamping fixture includes: The first clamping part is movably abutted against half of the outer wall of the pipe in the circumferential direction; The second clamping part is movably abutted against the other half of the outer wall of the pipe in the circumferential direction. One end of the second clamping part in the radial direction of the pipe is movably connected to the same end of the first clamping part through a hinge. The other end of the second clamping part in the radial direction of the pipe is fixedly connected to the same end of the first clamping part through a locking member. At least one mounting platform is disposed along the tangential direction of the outer wall of the pipe on the side of the first clamping part and / or the second clamping part facing away from the pipe, and the ultrasonic transducer is fixedly connected to the mounting platform along the radial direction of the pipe.

7. The pipe inner wall cleaning device according to claim 1, characterized in that, The cleaning medium is an environmentally friendly cleaning solution.

8. The pipe inner wall cleaning device according to claim 1, characterized in that, Also includes: Vibration feedback sensors are provided in the same number as the ultrasonic transducers and are positioned close to the corresponding ultrasonic transducers. The vibration feedback sensors are electrically connected to the ultrasonic generator to detect the vibration state of the corresponding ultrasonic transducer and output a feedback signal to the ultrasonic generator. The ultrasonic generator independently adjusts the excitation voltage signal output to the corresponding ultrasonic transducer based on the feedback signal from the vibration feedback sensor, so that the ultrasonic transducer operates under the set vibration parameters.

9. The pipe inner wall cleaning device according to claim 7, characterized in that, Also includes: The host computer has a display module and an operation module. The control module is located in the host computer and is electrically connected to the display module and the operation module respectively.

10. A simulation system for the operation of a pipe inner wall cleaning device under oscillating conditions, characterized in that, Including the pipe inner wall cleaning device as described in any one of claims 1-9, and A simulated pipe segment is configured to be identical to a segment of the stated pipe; Two end-sealing plates are respectively sealed and fixed to the openings at both ends of the simulated pipe section to form a sealed chamber inside the simulated pipe section; A swing platform device is fixedly connected to the simulated pipe section via a movable platform having at least three degrees of freedom swing amplitude to simulate the swing state of the pipe; The cleaning medium is filled in the chamber; the ultrasonic transducer is fixed to the outer wall of the simulated pipe by the clamping fixture to emit ultrasonic waves into the simulated pipe section and the cleaning medium by high-frequency vibration; the detection probe is set towards the simulated pipe section.

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