Method, device, equipment and storage medium for hot straightening of a bent rotor
By acquiring the curvature information of the bent rotor and calculating the target heat input information using a preset heat tracking program, the heating area is determined for heating correction, which solves the problem of the inability to straighten the bent rotor of a large steam turbine unit and improves the safety and stability of the unit.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- CHN ENERGY NEW ENERGY TECHNOLOGY RESEARCH INSTITUTE CO LTD
- Filing Date
- 2023-07-21
- Publication Date
- 2026-06-09
Smart Images
Figure CN117161140B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of rotor straightening technology, and more specifically to a thermal straightening method for a bent rotor, a thermal straightening device for a bent rotor, an electronic device, and a readable storage medium. Background Technology
[0002] In recent years, as the service life of thermal power units has increased, the turbine rotors of steam turbine units have experienced multiple bending accidents. The continued operation of large turbines after bending will cause increased vibration of the unit, increase the risk of collision and rubbing, exacerbate the difficulty of starting the unit, and pose a major safety hazard to the safe operation of large steam turbine units.
[0003] Current methods for correcting bent rotors involve adding weight to the middle of the rotor for high-speed dynamic balancing on-site or returning the rotor to the factory for machining of the middle section and performing high-speed dynamic balancing on a single rotor. However, while these methods can stop the further development of rotor bending, they cannot straighten such large-scale rotor bending, forcing the unit to operate with the problem for a long time, which increases the operational risk of the unit. Summary of the Invention
[0004] The purpose of this invention is to provide a method, apparatus, device, and storage medium for thermal straightening of bent rotors to solve the above-mentioned technical problems.
[0005] To achieve the above objectives, embodiments of the present invention provide a method for thermally straightening a bent rotor, the method comprising:
[0006] Obtain the curvature information of the bent rotor;
[0007] Based on the initial heat input data, the target heat input information at different times is calculated using a preset heat tracking program; wherein, the initial heat input data includes the initial heating rate, the initial isothermal temperature, the initial isothermal time, and the initial cooling rate, and the target heat input information includes the target heating rate, the target isothermal temperature, the target isothermal time, and the target cooling rate;
[0008] Based on the curvature information and the target heat input information, the target heating area is determined;
[0009] The target heating area is heated according to the corresponding target heat input information at different times.
[0010] Optionally, determining the target heating area based on the curvature information and the target heat input information includes:
[0011] Based on the curvature information, the initial heating area is determined;
[0012] The initial heating area and the target heat input information are input into a preset calculation model to determine the target heating area.
[0013] Optionally, the method further includes:
[0014] During the heating process of the target heating area, the temperature of the target heating area is monitored in real time;
[0015] Once the temperature of the target heating area reaches the preset temperature, the target heating area is then insulated.
[0016] Optionally, the method further includes:
[0017] Record the heating time of the target heating area in real time;
[0018] Once the preset heating time has been reached, the thermal correction is deemed complete, and heating of the target heating area is stopped.
[0019] In a second aspect of the present invention, a thermal straightening apparatus for a bent rotor is provided, the apparatus comprising:
[0020] The acquisition module is used to acquire the curvature information of the bent rotor;
[0021] The calculation module is used to calculate the target heat input information at different times based on the initial heat input data and using a preset heat tracking program; wherein, the initial heat input data includes the initial heating rate, the initial isothermal temperature, the initial isothermal time, and the initial cooling rate, and the target heat input information includes the target heating rate, the target isothermal temperature, the target isothermal time, and the target cooling rate.
[0022] The region determination module is used to determine the target heating region based on the curvature information and the target heat input information;
[0023] The heating module is used to heat the target heating area according to the corresponding target heat input information at different times.
[0024] Optionally, determining the target heating area based on the curvature information and the target heat input information includes:
[0025] Based on the curvature information, the initial heating area is determined;
[0026] The initial heating area and the target heat input information are input into a preset calculation model to determine the target heating area.
[0027] Optionally, the heating module is further used for:
[0028] During the heating process of the target heating area, the temperature of the target heating area is monitored in real time;
[0029] Once the temperature of the target heating area reaches the preset temperature, the target heating area is then insulated.
[0030] Optionally, the heating module is further used for:
[0031] Record the heating time of the target heating area in real time;
[0032] Once the preset heating time has been reached, the thermal correction is deemed complete, and heating of the target heating area is stopped.
[0033] A third aspect of this application provides an electronic device configured to perform the above-described thermal straightening method for a bent rotor.
[0034] A fourth aspect of this application provides a machine-readable storage medium storing instructions that, when executed by a processor, are configured by the processor to perform the aforementioned thermal straightening method for a bent rotor.
[0035] This invention, through obtaining the curvature information of a bent rotor, and then calculating the target heat input information at different times based on preset temperature rise data and a preset thermal tracking program, further determines the target heating area based on the curvature information and the target heat input information. Finally, the target heating area is heated at different times according to the corresponding target heat input information. In other words, this invention, by considering the heat input information, input area, and thermal cycle temperature effects of local heating, achieves thermal correction of the bent rotor, thereby improving the service safety performance of turbine components.
[0036] Other features and advantages of the embodiments of the present invention will be described in detail in the following detailed description section. Attached Figure Description
[0037] The accompanying drawings are provided to further illustrate embodiments of the present invention and form part of the specification. They are used together with the following detailed description to explain the embodiments of the present invention, but do not constitute a limitation thereof. In the drawings:
[0038] Figure 1 This is a schematic flowchart of a thermal straightening method for a bent rotor provided in an embodiment of the present invention;
[0039] Figure 2 This is a diagram showing the measurement positions of the dial indicator;
[0040] Figure 3 This is a diagram illustrating the reading of a dial indicator;
[0041] Figure 4It is a line graph showing the curvature of the bent rotor;
[0042] Figure 5 This is a schematic diagram of the area with the preset thermal tracking program;
[0043] Figure 6 (a) is a three-dimensional schematic diagram simulating a bent rotor;
[0044] Figure 6 (b) is a longitudinal section temperature polygon of the heating zone simulating a bent rotor;
[0045] Figure 6 (c) is a three-dimensional schematic diagram of the target heating area;
[0046] Figure 7 This is a functional module diagram of a thermal straightening device for a bent rotor provided in an embodiment of the present invention. Detailed Implementation
[0047] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of the present invention.
[0048] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit this application.
[0049] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.
[0050] Example 1
[0051] Please refer to Figure 1 , Figure 1 This is a schematic flowchart of a thermal straightening method for a bent rotor provided in this embodiment.
[0052] Step S100: Obtain the bending information of the bent rotor.
[0053] Specifically, such as Figure 2 As shown, in this embodiment, the entire circumference of the bent rotor can be divided into eight equal parts. Eight dial indicators are installed on the same longitudinal section along the shaft of the bent rotor, with the measuring rods of the dial indicators perpendicular to the surface of the shaft. This allows for the measurement of the bending degree of the bent rotor. For example, dial indicator III measures the bending degree of the shaft of the bent rotor in four directions at the cross-section. Figure 3 As shown, and so on, such as Figure 4 A rectangular coordinate system is established as shown, with the axis centerline as the abscissa and the curvature as the ordinate. The curvature measured by eight dial indicators is marked in the coordinate system. Connecting the points yields a curve. The curve is approximated as a straight line. The two straight lines intersect at point M, which is the ordinate of the maximum curvature. In this embodiment, the curvature of the bent rotor and the position of maximum curvature can be seen from the curve.
[0054] Step S200: Based on the initial heat input data, the target heat input information at different times is calculated using a preset heat tracking program; wherein, the initial heat input data includes the initial heating rate, the initial isothermal temperature, the initial isothermal time, and the initial cooling rate, and the target heat input information includes the target heating rate, the target isothermal temperature, the target isothermal time, and the target cooling rate.
[0055] To achieve "progressive" thermal correction of the bent rotor, the initial thermal input data includes the initial heating rate, initial isothermal temperature, initial isothermal time, and initial cooling rate. Preset heating data may include the heating rate, isothermal temperature, isothermal time, cooling rate, and tracking error value. Target thermal input information includes the target heating rate, target isothermal temperature, target isothermal time, and target cooling rate. It can be understood that the preset thermal tracking program utilizes iterative calculations to optimize the thermal correction operating parameters and improve the correction effect. The heating rate obtained from the iterative calculations should be no less than 9.6℃ / min.
[0056] Specifically, this embodiment performs simulated thermal correction on the simulated bending rotor based on preset temperature rise data, uses a preset thermal tracking program to monitor temperature data in real time, and calculates the target thermal input information for the heating area at different times through iterative calculations. For example, Figure 5 To simulate a bent rotor, the preset thermal tracking program examines regions A, B, and C. Region A is the upper surface, region C is the center of the thickness, and region B is the area between regions A and C. Regions A, B, and C lie on a straight line perpendicular to the ground. During the simulated thermal correction process, each time period is 5 minutes. After each time period, the preset thermal tracking program obtains the arithmetic mean of the temperature of each region. Based on the arithmetic mean of the temperature of each region under each time period, the target thermal input information at different times during the thermal correction process is obtained through iterative calculation.
[0057] Step S300: Determine the target heating area based on curvature information and target heat input information.
[0058] It is understood that in this embodiment, the area with a curvature greater than the preset curvature can be used as the initial heating area to provide a data basis for subsequent calculations.
[0059] Specifically, this step inputs the initial heating area and target heat input information into a preset calculation model. The preset calculation model optimizes the size of the initial heating area based on the target heat input information to obtain the target heating area. For example, the initial heating area is formed by... Figure 6 As shown in (a), a longitudinal section of the initial heating region is taken. Based on the aforementioned target heat input information, the temperature data of the longitudinal section is determined by... Figure 6 As shown in (b), the target heating area is determined by calculation using a preset calculation model. Figure 6 As shown in (c). The boundary conditions of the target heating area are that the axial distance of the area is 1m-2m, the axial heating range is 180°, and the heating angle is not less than 180°.
[0060] Step S400: Heat the target heating area according to the corresponding target heat input information at different times.
[0061] Specifically, in this embodiment, the target heating area is heated based on the target heat input information at different times, and the temperature and heating time of the target heating area are recorded. Once the temperature of the heating area reaches the preset temperature, the target heating area is insulated. Once the heating time reaches the preset heating time, the thermal correction is considered complete, and heating of the heating area is stopped. For example, when the bent rotor reaches the preset temperature, the bent rotor is insulated for no more than 60 minutes. After the heating time reaches the preset time, the power is turned off, and the wires, insulation asbestos, and heating elements are quickly removed. The rotor is then forced to cool with an electric fan for more than 48 hours.
[0062] This embodiment acquires the curvature information of the bent rotor, then calculates the target heat input information at different times based on preset temperature rise data and a preset thermal tracking program. Further, based on the curvature information and heat input information, the target heating area is determined, and finally, the target heating area is heated according to the heat input information. In other words, this embodiment achieves thermal correction of the bent rotor by considering the heat input information and area of local heating, as well as the influence of thermal cycling temperature, thereby improving the service safety performance of turbine components.
[0063] Example 2
[0064] Please refer to Figure 7 , Figure 7 This is a functional module diagram of a thermal straightening device 200 for a bent rotor provided in an embodiment of this application.
[0065] The acquisition module 210 is used to acquire the bending degree information of the bent rotor.
[0066] The calculation module 220 is used to calculate the target heat input information at different times based on the initial heat input data and using a preset heat tracking program; wherein, the initial heat input data includes the initial heating rate, the initial isothermal temperature, the initial isothermal time and the initial cooling rate, and the target heat input information includes the target heating rate, the target isothermal temperature, the target isothermal time and the target cooling rate.
[0067] The region determination module 230 is used to determine the target heating region based on curvature information and target heat input information.
[0068] Region determination module 230 is specifically used for:
[0069] The initial heating area is determined based on the curvature information;
[0070] The initial heating area and target heat input information are input into the preset calculation model to determine the target heating area.
[0071] The heating module 240 is used to heat the target heating area according to the corresponding target heat input information at different times.
[0072] Heating module 240, specifically used for:
[0073] During the heating process of the target heating area, the temperature of the target heating area is monitored in real time; once the temperature of the target heating area reaches the preset temperature, heat preservation treatment is performed on the target heating area. The heating module 240 is also specifically used for:
[0074] Record the heating time of the target heating area in real time;
[0075] Once the preset heating time has been reached, the thermal correction is deemed complete, and heating of the target heating area is stopped.
[0076] It should be understood that this device corresponds to the above-described embodiment of the thermal straightening method for bent rotors and is capable of performing the various steps involved in the above-described method embodiments. The specific functions of this device can be found in the description above, and detailed descriptions are omitted here to avoid repetition. The device includes at least one software functional module that can be stored in memory or embedded in the device's operating system (OS) in the form of software or firmware.
[0077] Example 3
[0078] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.
[0079] Memory may include non-persistent memory in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM. Memory is an example of computer-readable media.
[0080] Computer-readable media includes both permanent and non-permanent, removable and non-removable media that can store information using any method or technology. Information can be computer-readable instructions, data structures, modules of programs, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, magnetic magnetic disk storage or other magnetic storage devices, or any other non-transferable medium that can be used to store information accessible by a computing device. As defined herein, computer-readable media does not include transient computer-readable media, such as modulated data signals and carrier waves.
[0081] Example 4
[0082] This invention also provides a computer-readable storage medium storing instructions that, when executed by a processor, are adapted to perform a program having steps of a thermal straightening method for a bent rotor.
[0083] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.
[0084] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.
[0085] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.
[0086] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.
[0087] It should also be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the embodiments of the present invention will not describe the various possible combinations separately.
[0088] In addition, the functional modules in the various embodiments of this application can be integrated together to form an independent part, or each module can exist independently, or two or more modules can be integrated to form an independent part.
[0089] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.
[0090] The above are merely embodiments of this application and are not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.
Claims
1. A method for thermally straightening a bent rotor, characterized in that, The method includes: Obtain the curvature information of the bent rotor; Based on initial thermal input data, target thermal input information at different times is calculated using a preset thermal tracking program. Specifically, this includes: performing simulated thermal correction on a simulated bending rotor based on preset heating data; monitoring temperature data in real time using a preset thermal tracking program; and calculating target thermal input information for the heating area at different times through iterative calculations. The initial thermal input data includes initial heating rate, initial isothermal temperature, initial isothermal time, and initial cooling rate. The target thermal input information includes target heating rate, target isothermal temperature, target isothermal time, and target cooling rate. The preset heating data includes heating rate, isothermal temperature, isothermal time, cooling rate, and tracking error value. Based on the curvature information and the target heat input information, the target heating area is determined; The target heating area is heated according to the corresponding target heat input information at different times.
2. The thermal straightening method for a bent rotor according to claim 1, characterized in that, The determination of the target heating area based on the curvature information and the target heat input information includes: Based on the curvature information, the initial heating area is determined; The initial heating area and the target heat input information are input into a preset calculation model to determine the target heating area.
3. The thermal straightening method for a bent rotor according to claim 2, characterized in that, The method further includes: During the heating process of the target heating area, the temperature of the target heating area is monitored in real time; Once the temperature of the target heating area reaches the preset temperature, the target heating area is then insulated.
4. The thermal straightening method for a bent rotor according to claim 3, characterized in that, The method further includes: Record the heating time of the target heating area in real time; Once the preset heating time has been reached, the thermal correction is deemed complete, and heating of the target heating area is stopped.
5. A thermal straightening device for a bent rotor, characterized in that, The device includes: The acquisition module is used to acquire the curvature information of the bent rotor; The calculation module is used to calculate the target thermal input information at different times based on the initial thermal input data and using a preset thermal tracking program. Specifically, it includes: performing simulated thermal correction on the simulated bending rotor based on preset heating data, monitoring temperature data in real time using the preset thermal tracking program, and calculating the target thermal input information for the heating area at different times through iterative calculations. The initial thermal input data includes the initial heating rate, initial isothermal temperature, initial isothermal time, and initial cooling rate. The target thermal input information includes the target heating rate, target isothermal temperature, target isothermal time, and target cooling rate. The preset heating data includes the heating rate, isothermal temperature, isothermal time, cooling rate, and tracking error value. The region determination module is used to determine the target heating region based on the curvature information and the target heat input information; The heating module is used to heat the target heating area according to the corresponding target heat input information at different times.
6. The thermal straightening device for a bent rotor according to claim 5, characterized in that, The region determination module is specifically used for: Based on the curvature information, the initial heating area is determined; The initial heating area and the target heat input information are input into a preset calculation model to determine the target heating area.
7. The thermal straightening device for a bent rotor according to claim 6, characterized in that, The heating module is also used for: During the heating process of the target heating area, the temperature of the target heating area is monitored in real time; Once the temperature of the target heating area reaches the preset temperature, the target heating area is then insulated.
8. The thermal straightening device for a bent rotor according to claim 7, characterized in that, The heating module is also used for: Record the heating time of the target heating area in real time; Once the preset heating time has been reached, the thermal correction is deemed complete, and heating of the target heating area is stopped.
9. An electronic device, characterized in that, include: A processor and a memory, the memory storing machine-readable instructions executable by the processor, which, when executed by the processor, perform the thermal straightening method for a bent rotor as described in any one of claims 1-4.
10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores instructions for causing a machine to perform the thermal straightening method for a bent rotor as described in any one of claims 1-4.