Operation and maintenance assisting method and system for heat transfer tube bundle of steam generator, and medium and device

Abstract

An operation and maintenance assisting method and system for a heat transfer tube bundle of a steam generator, and a medium and a device. The operation and maintenance assisting method for a heat transfer tube bundle of a steam generator comprises the following steps: acquiring actual measurement data of inlet and outlet connecting tubes on a primary side and a secondary side of a steam generator (S10); on the basis of the actual measurement data, simulating the internal operation condition of the steam generator, so as to obtain simulation parameters of a tube bundle area of the steam generator (S20); on the basis of a micro-vibration wear analysis model and on the basis of the simulation parameters, performing micro-vibration wear analysis on each heat transfer tube, so as to obtain the current wear depth of each heat transfer tube (S30); and on the basis of the current wear depth, calculating a predicted wear depth of each heat transfer tube that corresponds to at least one target time point (S40). By means of analyzing the micro-vibration wear of all heat transfer tubes in a steam generator and predictively giving the corresponding wear depths of each heat transfer tube at different target time points, a service behavior of each heat transfer tube can be tracked and the service life of each heat transfer tube can be predicted.

Description

A steam generator heat transfer tube bundle operation and maintenance auxiliary method, system, medium and equipment Technical Field

[0001] The present invention relates to the technical field of steam generators in nuclear power plants, and in particular to an auxiliary operation and maintenance method, system, medium and equipment for a heat transfer tube bundle of a steam generator. Background Art

[0002] The steam generator is a key component in a pressurized water reactor (PWR) nuclear power system, connecting the primary and secondary circuits. It performs crucial heat and mass transfer functions. Coolant from the core transfers heat to the secondary circuit fluid through heat transfer tubes, generating steam. The primary circuit coolant is characterized by high temperature, high pressure, and radioactivity. The secondary circuit fluid undergoes single-phase convection heat transfer and boiling heat transfer within the steam generator, converting it into steam that drives the steam turbine for power generation.

[0003] Steam generator operation involves complex internal physical processes and a harsh operating environment, placing extreme strain on all components. U-shaped heat transfer tubes are among the most critical components. The working fluid inside the tubes is a radioactive coolant, while the working fluid outside is water and steam. These tubes operate in a coupled environment characterized by heat exchange, flow, and vibration. Thousands of these tubes are located within a steam generator, requiring support plates, vibration dampers, and other solid components to secure and support them. Heat exchange between the fluid inside and outside the tubes is coupled, and the flow of the fluid outside the tubes can fluctuate between perpendicular and parallel to the tube bundle. These tubes, with a total area exceeding 85% of the primary circuit boundary and a wall thickness of only approximately 1 mm, are the weakest component in the primary circuit. Their reliability and integrity are directly linked to the proper functioning of the nuclear power steam supply system. Failure can result in significant economic losses and threaten nuclear safety. Of the 235 nuclear power plants operating between 1993 and 2012, 138, or 58.7%, experienced shutdowns due to heat transfer tube defects, making them the leading cause of unplanned nuclear power plant shutdowns. Heat transfer tubes are subjected to forced vibrations by the steam-liquid two-phase flow on the secondary side of the steam generator, leading to contact wear between the tubes and components such as support plates and anti-vibration strips. Therefore, fretting wear between the tubes and the support structure is the primary cause of heat transfer tube defects.

[0004] However, steam generators operate in a high-temperature, high-pressure, and closed environment, and their internal components are extremely complex, making the sensor monitoring signals of steam generators in operating nuclear power plants very limited. The health status of steam generator heat transfer tubes can only be detected through eddy current non-destructive testing during regular overhauls.

[0005] Furthermore, related technologies typically select a typical set of 10 or more heat transfer tubes for analysis during the design and analysis phase, employing an envelope approach for conservative structural and thermal design. This makes it impossible to track the service behavior and lifespan of each heat transfer tube. Furthermore, there is no solution for accurately predicting the health status of heat transfer tubes. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a method, system, medium and equipment for auxiliary operation and maintenance of a steam generator heat transfer tube bundle.

[0007] The technical solution adopted by the present invention to solve the technical problem is: a steam generator heat transfer tube bundle operation and maintenance auxiliary method, comprising the following steps:

[0008] S10, obtaining actual measurement data of the inlet and outlet pipes on the primary and secondary sides of the steam generator;

[0009] S20, simulating the internal operating conditions of the steam generator according to the actual measurement data to obtain simulation parameters of the steam generator tube bundle area;

[0010] S30. Based on the fretting wear analysis model, perform fretting wear analysis on each heat transfer tube according to the simulation parameters to obtain the current wear depth of each heat transfer tube.

[0011] S40: Calculate, based on the current wear depth, a predicted wear depth of each heat transfer tube corresponding to at least one target time point.

[0012] Furthermore, in the steam generator heat transfer tube bundle operation and maintenance auxiliary method of the present invention, after step S20 and before step S30, the method further includes:

[0013] S50, performing a three-dimensional thermal-hydraulic analysis based on the simulation parameters to obtain fluid parameters of each heat transfer tube in the tube bundle area of ​​the steam generator;

[0014] Step S30 includes:

[0015] Based on the fretting wear analysis model, fretting wear analysis is performed on each heat transfer tube according to the fluid parameters to obtain the current wear depth of each heat transfer tube.

[0016] Furthermore, in the steam generator heat transfer tube bundle operation and maintenance auxiliary method of the present invention, after step S30, the method further includes:

[0017] S60. Obtaining the actual wear depth of the steam generator heat transfer tube obtained by eddy current testing during periodic overhaul of the nuclear power plant, and comparing the actual wear depth with the current wear depth, and verifying the feasibility of the fretting wear analysis model based on the obtained comparison result.

[0018] Furthermore, in the steam generator heat transfer tube bundle operation and maintenance auxiliary method of the present invention, step S30 further includes:

[0019] A fretting wear analysis model is preset for each heat transfer tube, and the fretting wear analysis is performed on the heat transfer tube according to the fluid parameters of each heat transfer tube to obtain the current wear depth of each heat transfer tube.

[0020] Furthermore, in the steam generator heat transfer tube bundle operation and maintenance auxiliary method of the present invention, step S60 further includes:

[0021] When the comparison result exceeds the preset deviation range, the configuration parameters of the fretting wear analysis model are adjusted, and step S30 is performed again until the comparison result is within the preset deviation range, and then the adjustment of the configuration parameters is stopped.

[0022] Furthermore, in the steam generator heat transfer tube bundle operation and maintenance auxiliary method described in the present invention, the configuration parameters include at least one of the boundary conditions, additional mass, and damping ratio of the heat transfer tube, and the boundary conditions include the support state value and / or gap value of the heat transfer tube.

[0023] Furthermore, in the steam generator heat transfer tube bundle operation and maintenance auxiliary method of the present invention, step S30 further includes:

[0024] Dynamic characteristics modeling and analysis of the heat transfer tubes are performed based on the geometric structure, material properties, and support positions of the support plates and anti-vibration strips of each heat transfer tube to obtain the dynamic characteristics of each heat transfer tube. Furthermore, based on the fretting wear analysis model, fretting wear analysis is performed on each heat transfer tube based on the dynamic characteristics and the fluid parameters to obtain the current wear depth of each heat transfer tube.

[0025] The dynamic characteristics include vibration frequency and / or vibration shape.

[0026] Furthermore, in the steam generator heat transfer tube bundle operation and maintenance auxiliary method of the present invention, the method further includes:

[0027] S70. Based on the fluid-elastic instability analysis model, perform fluid-elastic instability analysis on each heat transfer tube according to the fluid parameters, obtain and display the fluid-elastic instability rate, vibration stress and / or vibration displacement of each heat transfer tube.

[0028] Furthermore, in the steam generator heat transfer tube bundle operation and maintenance auxiliary method of the present invention, step S50 includes:

[0029] In the three-dimensional thermal-hydraulic analysis model, based on the simulation parameters, mass conservation, momentum conservation, and energy conservation calculations are performed on the secondary side of the tube bundle area, and energy conservation calculations are performed on the primary side of the tube bundle area. This results in the heat exchange rate between the primary and secondary sides through the heat transfer tube surfaces. Based on this heat exchange rate and the location of each heat transfer tube, the fluid parameters along the length of each heat transfer tube in the steam generator tube bundle area are calculated.

[0030] The fluid parameters include fluid velocity and / or fluid density.

[0031] Furthermore, in the steam generator heat transfer tube bundle operation and maintenance auxiliary method of the present invention, step S20 includes:

[0032] Performing real-time simulation of the internal operating conditions of the steam generator based on the actual measurement data to obtain simulation parameters of the steam generator tube bundle area;

[0033] The actual measurement data includes at least one of the flow rate, pressure, and temperature of the inlet and outlet pipes on the primary and secondary sides of the steam generator. The simulation parameters include at least one of the flow rate at the bottom inlet of the tube bundle area, the enthalpy value at the bottom inlet of the tube bundle area, the temperature at the bottom inlet of the tube bundle area, the outlet pressure of the sleeve top cover, the temperature at the primary inlet of the heat transfer tube, and the flow rate at the primary inlet of the heat transfer tube. The tube bundle area is the area enclosed by the secondary side surface of the tube sheet, the sleeve, and the sleeve top cover, and includes the heat transfer tubes, support plates, and anti-vibration strips.

[0034] Furthermore, in the steam generator heat transfer tube bundle operation and maintenance auxiliary method of the present invention, the method further includes:

[0035] S80: Visually display the current wear depth and / or the predicted wear depth.

[0036] Furthermore, in the steam generator heat transfer tube bundle operation and maintenance auxiliary method of the present invention, the method further includes:

[0037] S90: Monitor the current wear depth of each heat transfer tube, and issue a fault warning when the current wear depth exceeds a preset threshold.

[0038] In addition, the present invention also provides a steam generator heat transfer tube bundle operation and maintenance auxiliary system, comprising:

[0039] An acquisition unit, used to acquire actual measurement data of the inlet and outlet pipes on the primary and secondary sides of the steam generator;

[0040] a simulation unit, configured to simulate the internal operating conditions of the steam generator according to the actual measurement data, and obtain simulation parameters of the tube bundle area of ​​the steam generator;

[0041] an analysis unit, configured to perform a fretting wear analysis on each heat transfer tube based on the fretting wear analysis model and the simulation parameters to obtain a current wear depth of each heat transfer tube;

[0042] The prediction unit is used to calculate the predicted wear depth of each heat transfer tube corresponding to at least one target time point according to the current wear depth.

[0043] In addition, the present invention also provides a computer-readable storage medium storing a computer program, wherein the computer program is suitable for being loaded by a processor to execute the steps of the above-mentioned steam generator heat transfer tube bundle operation and maintenance auxiliary method.

[0044] In addition, the present invention also provides a computer device, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the steps of the above-mentioned steam generator heat transfer tube bundle operation and maintenance auxiliary method by calling the computer program stored in the memory.

[0045] The steam generator heat transfer tube bundle operation and maintenance assistance method, system, medium, and equipment implemented in the present invention have at least the following beneficial effects: by analyzing the micro-vibration wear of all heat transfer tubes in the steam generator, the present invention predictively provides the wear depth corresponding to each heat transfer tube at different target time points, thereby enabling tracking of the service behavior and life prediction of each heat transfer tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0047] FIG1 is a schematic flow chart of a steam generator heat transfer tube bundle operation and maintenance assistance method according to an embodiment of the present invention;

[0048] FIG2 is a schematic flow chart of a steam generator heat transfer tube bundle operation and maintenance assistance method according to some embodiments of the present invention;

[0049] FIG3 is a schematic flow chart of a steam generator heat transfer tube bundle operation and maintenance assistance method according to some embodiments of the present invention;

[0050] FIG4 is a schematic flow chart of a steam generator heat transfer tube bundle operation and maintenance assistance method according to some embodiments of the present invention;

[0051] FIG5 is a schematic flow chart of a steam generator heat transfer tube bundle operation and maintenance assistance method according to some embodiments of the present invention;

[0052] FIG6 is a schematic flow chart of a steam generator heat transfer tube bundle operation and maintenance assistance method according to some embodiments of the present invention;

[0053] FIG7 is a schematic structural diagram of a steam generator heat transfer tube bundle operation and maintenance auxiliary system according to an embodiment of the present invention. DETAILED DESCRIPTION

[0054] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described in detail with reference to the accompanying drawings.

[0055] In the following description, specific details such as particular system structures and techniques are provided for purposes of illustration, not limitation, to facilitate a thorough understanding of the embodiments of the present invention. However, it will be apparent to those skilled in the art that the present invention may be practiced in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.

[0056] In order to facilitate understanding of the present invention, the present invention will be described more fully below. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0057] In a preferred embodiment, referring to FIG1 , the steam generator heat transfer tube bundle operation and maintenance auxiliary method of this embodiment includes the following steps:

[0058] S10: Acquire actual measurement data of the inlet and outlet pipes on the primary and secondary sides of the steam generator. Specifically, the actual measurement data includes but is not limited to real-time parameters such as flow rate, pressure, and temperature of the inlet and outlet pipes on the primary and secondary sides of the steam generator.

[0059] S20. Simulate the internal operating conditions of the steam generator based on the actual measured data to obtain simulation parameters for the steam generator tube bundle area. It should be noted that the tube bundle area is the area enclosed by the secondary surface of the tube sheet, the sleeve, and the sleeve top cover. This area includes components such as heat transfer tubes, support plates, and anti-vibration strips.

[0060] As can be understood, this embodiment performs a one-dimensional transient thermal-hydraulic analysis of the steam generator based on a preset steam generator transient analysis theoretical model to obtain simulation parameters of the steam generator tube bundle area. Specifically, real-time parameters such as the flow rate, pressure, and temperature of the inlet and outlet pipes on the primary and secondary sides of the steam generator are connected to the steam generator transient analysis theoretical model to simulate the internal operating conditions of the steam generator in real time. Through analysis, real-time simulation parameters such as the inlet flow rate, enthalpy value, and temperature of the bottom of the tube bundle area, the outlet pressure of the sleeve top cover, and the inlet temperature and flow rate of the primary side of the heat transfer tube are obtained.

[0061] Preferably, referring to FIG2 , after step S20 and before step S30, the method further includes:

[0062] S50. Perform a three-dimensional thermal-hydraulic analysis based on the simulation parameters to obtain the fluid parameters of each heat transfer tube in the tube bundle area of ​​the steam generator.

[0063] As will be appreciated, this embodiment performs a three-dimensional thermal-hydraulic analysis of the steam generator tube bundle area using a preset three-dimensional thermal-hydraulic analysis model to obtain fluid parameters such as fluid velocity and fluid density along the length of each heat transfer tube. Specifically, in the three-dimensional thermal-hydraulic analysis model, mass conservation, momentum conservation, and energy conservation calculations are performed on the secondary side of the tube bundle area based on simulation parameters, and energy conservation calculations are performed on the primary side of the tube bundle area to obtain the heat exchange rate between the primary and secondary sides through the heat transfer tube surfaces. Based on the heat exchange rate and the location of each heat transfer tube, the fluid parameters along the length of each heat transfer tube in the steam generator tube bundle area are calculated.

[0064] It should be noted that in order to obtain more accurate fluid parameters, the fluid velocity and fluid density at the location of each heat transfer tube are determined by the location of the heat transfer tube. For example, structures such as the secondary side tube bundle and tie rods of the steam generator are considered using a distributed resistance method. However, since supporting structures such as tube support plates and anti-vibration strips have good fluid permeability, they are considered using a concentrated resistance method in the three-dimensional thermal-hydraulic analysis model.

[0065] S30. Based on the fretting wear analysis model, perform fretting wear analysis on each heat transfer tube according to simulation parameters to obtain the current wear depth of each heat transfer tube.

[0066] It will be appreciated that, after obtaining the fluid parameters of each heat transfer tube based on the simulation parameters, this embodiment uses the calculated fluid parameters such as the fluid velocity and density along the length of each heat transfer tube as input parameters of a preset heat transfer tube fretting wear analysis model and performs fretting wear analysis to obtain the current wear depth of each heat transfer tube.

[0067] Specifically, in some embodiments, step S30 includes presetting a fretting wear analysis model for each heat transfer tube, performing fretting wear analysis on each heat transfer tube based on the fluid parameters of each heat transfer tube, and thereby determining the current wear depth of each heat transfer tube. This embodiment establishes a separate fretting wear analysis model for each heat transfer tube.

[0068] Alternatively, in some embodiments, step S30 further includes: performing dynamic characteristic modeling and analysis on each heat transfer tube based on its geometric structure, material properties, and the support positions of its support plates and anti-vibration strips to obtain the dynamic characteristics of each heat transfer tube. Furthermore, based on a fretting wear analysis model, fretting wear analysis is performed on each heat transfer tube based on the dynamic characteristics and fluid parameters to obtain the current wear depth of each heat transfer tube. Dynamic characteristics include vibration frequency, vibration shape, etc. In other words, before performing the fretting wear analysis, a dynamic characteristic analysis is performed on each heat transfer tube to obtain the inherent characteristics of the heat transfer tube, such as vibration frequency and vibration shape.

[0069] S40: Calculate the predicted wear depth for each heat transfer tube at at least one target time point based on the current wear depth. It is understood that the system can retrieve the predicted wear depth for each heat transfer tube at other future time points from a pre-stored wear pattern curve based on the current wear depth and the current operating time of the heat transfer tube. For example, the system can predict fretting wear depths for 5, 10, 30, or 60 years.

[0070] In this embodiment, an envelope-based design analysis model is no longer used. Instead, the micro-vibration wear of all heat transfer tubes in the steam generator is analyzed to predict the wear depth of each heat transfer tube at different target time points. This allows tracking of the service behavior and lifespan prediction of each heat transfer tube, and further, enables real-time monitoring of the health status of each heat transfer tube in the steam generator.

[0071] In some embodiments of the steam generator heat transfer tube bundle operation and maintenance assistance method, referring to FIG3 , after step S30, the method further includes:

[0072] S60. Obtain the actual wear depth of the steam generator heat transfer tube obtained by eddy current testing during periodic overhaul of the nuclear power plant, compare the actual wear depth with the current wear depth, and verify the feasibility of the micro-vibration wear analysis model based on the obtained comparison results.

[0073] It is understood that when the comparison result exceeds the preset deviation range, the configuration parameters of the fretting wear analysis model are adjusted, and step S30 is executed again until the comparison result is within the preset deviation range. At this point, the configuration parameter adjustment and step S30 are discontinued. Specifically, the configuration parameters include, but are not limited to, the boundary conditions, added mass, and damping ratio of the heat transfer tube. Boundary conditions include the support state and clearance value of the heat transfer tube. Of course, the preset deviation range can be 0, meaning that the preset deviation range can be consistent with the current wear depth and the actual wear depth detected by eddy current detection.

[0074] In this embodiment, since the heat transfer tubes are supported by multiple layers of support plates and multiple groups of anti-vibration bars, the final state of the support plates and anti-vibration bars after component manufacturing and assembly is not completely consistent with the theoretical model. Furthermore, it is impossible to inspect and confirm the dense tube bundle and internal components after manufacturing is completed. Therefore, when the comparison result exceeds the preset deviation range, the micro-vibration wear analysis model adjusts the boundary conditions such as the heat transfer tube support state and gap value, as well as configuration parameters such as the added mass and damping ratio. The analysis in step S30 is then repeated. Through big data analysis technology, an empirical model is trained that conforms to the vibration and wear characteristics of the heat transfer tubes during actual service, thereby realizing intelligent fault diagnosis and fault warning for the heat transfer tubes.

[0075] In some embodiments of the steam generator heat transfer tube bundle operation and maintenance assistance method, referring to FIG4 , the method further includes:

[0076] S70. Based on the hydroelastic instability analysis model, perform a hydroelastic instability analysis on each heat transfer tube according to the fluid parameters, obtain and display the hydroelastic instability rate, vibration stress and / or vibration displacement of each heat transfer tube.

[0077] As can be understood, dynamic characteristics modeling and analysis of each heat transfer tube are performed based on its geometry, material properties, and the support positions of its support plates and anti-vibration strips to determine the dynamic characteristics of each heat transfer tube. Furthermore, based on the hydroelastic instability analysis model, parameters such as the calculated fluid velocity and density along the length of each heat transfer tube are used as input parameters for the flow-induced vibration of the heat transfer tube. Based on the dynamic characteristics, a hydroelastic instability analysis is performed on each heat transfer tube to determine the hydroelastic instability rate, vibration stress, and vibration displacement of each heat transfer tube. Dynamic characteristics include vibration frequency and vibration shape. In other words, before performing the hydroelastic instability analysis, a dynamic characteristics analysis is performed on each heat transfer tube to determine its inherent characteristics, such as vibration frequency and vibration shape.

[0078] This embodiment performs hydroelastic instability analysis on all heat transfer tubes in the steam generator, which can more accurately track the service behavior of each heat transfer tube, thereby realizing fault diagnosis, health status prediction and intelligent operation and maintenance of the steam generator heat transfer tubes.

[0079] Optionally, in some embodiments, referring to FIG5 , the method further includes: S80, visually displaying the current wear depth and / or predicted wear depth. This embodiment visualizes key analysis results such as the current wear depth, predicted wear depth, and flow-elastic instability rate, vibration stress, and vibration displacement, enabling more intuitive intelligent operation and maintenance.

[0080] Optionally, in some embodiments, referring to FIG6 , the method further includes: S90 , monitoring the current wear depth of each heat transfer tube, and issuing a fault warning when the current wear depth exceeds a preset threshold.

[0081] In another preferred embodiment, referring to FIG7 , the steam generator heat transfer tube bundle operation and maintenance auxiliary system of this embodiment includes:

[0082] The acquisition unit is used to obtain actual measurement data of the inlet and outlet pipes on the primary and secondary sides of the steam generator.

[0083] The simulation unit is used to simulate the internal operating conditions of the steam generator according to the actual measurement data and obtain the simulation parameters of the steam generator tube bundle area.

[0084] The analysis unit is used to perform fretting wear analysis on each heat transfer tube based on the fretting wear analysis model and simulation parameters to obtain the current wear depth of each heat transfer tube.

[0085] The prediction unit is configured to calculate a predicted wear depth for each heat transfer tube corresponding to at least one target time point based on the current wear depth. Obtaining the predicted wear depth is equivalent to obtaining a predicted lifespan of the heat transfer tube.

[0086] This embodiment analyzes the fretting wear of all heat transfer tubes in the steam generator and predicts the wear depth of each heat transfer tube at different target time points, thereby enabling tracking of the service behavior and life prediction of each heat transfer tube.

[0087] In another preferred embodiment, the computer-readable storage medium of this embodiment stores a computer program, which is suitable for loading by a processor to execute the steps of the above-mentioned steam generator heat transfer tube bundle operation and maintenance auxiliary method.

[0088] This embodiment analyzes the fretting wear of all heat transfer tubes in the steam generator and predicts the wear depth of each heat transfer tube at different target time points, thereby enabling tracking of the service behavior and life prediction of each heat transfer tube.

[0089] In another preferred embodiment, the computer device of this embodiment includes a memory and a processor, the memory stores a computer program, and the processor executes the steps of the above-mentioned steam generator heat transfer tube bundle operation and maintenance auxiliary method by calling the computer program stored in the memory.

[0090] This embodiment analyzes the fretting wear of all heat transfer tubes in the steam generator and predicts the wear depth of each heat transfer tube at different target time points, thereby enabling tracking of the service behavior and life prediction of each heat transfer tube.

[0091] It should be noted that the computer-readable storage medium of the present invention can be any computer-readable storage medium that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a magnetic disk, or an optical disk.

[0092] The processor of the present invention is used to provide computing and control capabilities to support the operation of the entire steam generator heat transfer tube bundle operation and maintenance auxiliary system. It should be understood that in the embodiments of the present application, the processor can be a central processing unit (CPU). The processor can also be other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor or any conventional processor.

[0093] Professionals may further appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the above description has generally described the components and steps of each example according to their functions. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present invention.

[0094] The steps of the methods or algorithms described in conjunction with the embodiments disclosed herein may be implemented directly using hardware, a software module executed by a processor, or a combination of the two. The software module may be placed in random access memory (RAM), internal memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.

[0095] It is understandable that the above embodiments only express the preferred implementation modes of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the patent scope of the present invention. It should be pointed out that for ordinary technicians in this field, without departing from the concept of the present invention, the above technical features can be freely combined, and several deformations and improvements can be made, all of which fall within the scope of protection of the present invention. Therefore, all equivalent changes and modifications made to the scope of the claims of the present invention should fall within the scope of coverage of the claims of the present invention.

Claims

1. An auxiliary method for operation and maintenance of a heat transfer tube bundle of a steam generator, characterized in that It includes the following steps: S10. Obtain the actual measurement data of the inlet and outlet nozzles of the primary and secondary sides of the steam generator; S20. Simulate the internal operating conditions of the steam generator according to the actual measurement data to obtain the simulation parameters of the tube bundle area of the steam generator; S30. Based on the fretting wear analysis model, perform fretting wear analysis on each heat transfer tube according to the simulation parameters to obtain the current wear depth of each heat transfer tube; S40. Calculate the predicted wear depth corresponding to at least one target time point of each heat transfer tube according to the current wear depth.

2. The operation and maintenance assistance method for the heat transfer tube bundle of the steam generator according to claim 1, wherein, After step S20 and before step S30, it further includes: S50. Perform three-dimensional thermohydraulic analysis according to the simulation parameters to obtain the fluid parameters of each heat transfer tube in the tube bundle area of the steam generator; Step S30 includes: Based on the fretting wear analysis model, perform fretting wear analysis on each heat transfer tube according to the fluid parameters to obtain the current wear depth of each heat transfer tube.

3. The steam generator heat transfer tube bundle operation and maintenance assistance method according to claim 2, characterized in that, After step S30, it further includes: S60. Obtain the actual wear depth of the heat transfer tubes of the steam generator obtained by eddy current detection during the regular overhaul of the nuclear power plant, compare the actual wear depth with the current wear depth, and moreover, verify the feasibility of the fretting wear analysis model according to the obtained comparison result.

4. The operation and maintenance assistance method for the heat transfer tube bundle of the steam generator according to claim 3, wherein Step S30 further includes: Preset a fretting wear analysis model for each heat transfer tube, and perform fretting wear analysis on the heat transfer tube according to the fluid parameters of each heat transfer tube, so as to obtain the current wear depth of each heat transfer tube.

5. The operation and maintenance assistance method for the heat transfer tube bundle of the steam generator according to claim 4, characterized in that, Step S60 further includes: When the comparison result exceeds the preset deviation range, adjust the configuration parameters of the fretting wear analysis model, and moreover, execute step S30 again until the comparison result is within the preset deviation range, then stop adjusting the configuration parameters.

6. The operation and maintenance assistance method for the heat transfer tube bundle of the steam generator according to claim 5, wherein The configuration parameters include at least one of the boundary conditions of the heat transfer tube, the added mass, and the damping ratio, and the boundary conditions include the support state value and / or the clearance value of the heat transfer tube.

7. The operation and maintenance assistance method for the heat transfer tube bundle of the steam generator according to claim 2, characterized in that, Step S30 further includes: Perform dynamic characteristic modeling analysis on the heat transfer tubes according to the geometric structure, material properties, support positions of the support plates and anti-vibration strips of each heat transfer tube to obtain the dynamic characteristics of each heat transfer tube, and moreover, based on the fretting wear analysis model, perform fretting wear analysis on each heat transfer tube according to the dynamic characteristics and the fluid parameters to obtain the current wear depth of each heat transfer tube; Wherein, the dynamic characteristics include the vibration frequency and / or the vibration shape.

8. The operation and maintenance assistance method for the heat transfer tube bundle of the steam generator according to claim 2, characterized in that, This method further includes: S70. Based on the fluidelastic instability analysis model, perform fluidelastic instability analysis on each heat transfer tube according to the fluid parameters to obtain the fluidelastic instability rate, vibration stress and / or vibration displacement of each heat transfer tube and display them.

9. The operation and maintenance assistance method for the heat transfer tube bundle of the steam generator according to claim 2, characterized in that Step S50 includes: In the three-dimensional thermohydraulic analysis model, perform mass conservation, momentum conservation and energy conservation calculations on the secondary side of the tube bundle area according to the simulation parameters, perform energy conservation calculation on the primary side of the tube bundle area, so as to obtain the heat exchange amount between the primary side and the secondary side through the surface of the heat transfer tube, and calculate the fluid parameters of each heat transfer tube in the tube bundle area of the steam generator along the tube length direction according to the heat exchange amount and in combination with the position of each heat transfer tube. Among them, the fluid parameters include fluid velocity and / or fluid density.

10. The operation and maintenance assistance method for the heat transfer tube bundle of the steam generator according to claim 1, characterized in that, Step S20 includes: Performing real-time simulation on the internal operating condition of the steam generator according to the actual measurement data to obtain the simulation parameters of the tube bundle area of the steam generator; Among them, the actual measurement data includes at least one of the flow rate, pressure, and temperature at the inlet and outlet nozzles on the primary and secondary sides of the steam generator, and the simulation parameters include at least one of the flow rate at the bottom inlet of the tube bundle area, the enthalpy value at the bottom inlet of the tube bundle area, the temperature at the bottom inlet of the tube bundle area, the outlet pressure of the sleeve top cover, the temperature at the primary side inlet of the heat transfer tube, and the flow rate at the primary side inlet of the heat transfer tube. The tube bundle area is the area enclosed by the secondary side surface of the tube sheet, the sleeve, and the sleeve top cover, and this area includes heat transfer tubes, support plates, and anti-vibration strips.

11. The operation and maintenance assistance method for the heat transfer tube bundle of the steam generator according to claim 1, wherein, This method further includes: S80. Visually display the current wear depth and / or the predicted wear depth.

12. The operation and maintenance assistance method for the heat transfer tube bundle of the steam generator according to claim 1 or 2, characterized in that, This method further includes: S90. Monitor the current wear depth of each heat transfer tube, and issue a fault warning when the current wear depth exceeds a preset threshold.

13. An operation and maintenance assistance system for a heat transfer tube bundle of a steam generator, characterized in that, It includes: An acquisition unit for acquiring the actual measurement data of the inlet and outlet nozzles on the primary and secondary sides of the steam generator; A simulation unit for simulating the internal operating condition of the steam generator according to the actual measurement data to obtain the simulation parameters of the tube bundle area of the steam generator; An analysis unit for performing fretting wear analysis on each heat transfer tube based on the fretting wear analysis model according to the simulation parameters to obtain the current wear depth of each heat transfer tube; A prediction unit for calculating the predicted wear depth corresponding to at least one target time point of each heat transfer tube according to the current wear depth.

14. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program, and the computer program is suitable for being loaded by a processor to execute the steps of the steam generator heat transfer tube bundle operation and maintenance assistance method according to any one of claims 1 to 12.

15. A computer device, characterized in that, It includes a memory and a processor. The memory stores a computer program, and the processor executes the steps of the steam generator heat transfer tube bundle operation and maintenance assistance method according to any one of claims 1 to 12 by calling the computer program stored in the memory.

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