Method and device for manufacturing a cylinder

Abstract

The application provides a manufacturing method and device of a cylinder, and relates to the technical field of steam turbine equipment. The method comprises the following steps: S1, constructing a simulation model of the cylinder according to structure data of the cylinder; S2, performing thermodynamic simulation on the operation process of the cylinder according to the simulation model, and determining the ovality deformation of the cylinder under the thermal-elastic coupling effect according to the simulation result; S3, in the case that the ovality deformation is not within a preset threshold range, adjusting the structure data of the cylinder, repeatedly performing the above steps S1-S2 by using the adjusted structure data, and stopping until the ovality deformation corresponding to the adjusted structure data is within the threshold range; and S4, manufacturing the cylinder by using the ovality deformation corresponding to the adjusted structure data.

Description

Technical Field

[0001] This application relates to the field of steam turbine equipment technology, and more specifically, to a method and apparatus for manufacturing a cylinder. Background Technology

[0002] The cylinder is a crucial core component of a steam turbine, characterized by its complex structure and high dimensional accuracy requirements. In particular, the high- and intermediate-pressure inner cylinder endures both high temperatures and high pressures, resulting in extremely harsh working conditions. Therefore, the design and structural integrity of the cylinder have a significant impact on the economic efficiency and safety of the unit's operation.

[0003] During the startup and operation of a steam turbine, the cylinder may undergo uneven deformation due to the combined effects of thermal and mechanical stresses. In particular, the radial deformation may exhibit a large degree of ellipticity. This deformation may not only cause steam leakage at the split surface but may also lead to increased leakage of the steam seal, reducing the unit's thermal efficiency. In severe cases, it may even cause dynamic and static rubbing accidents.

[0004] Therefore, effectively controlling and optimizing the cylinder's deformation ellipticity has become a key issue in steam turbine design. Currently, the deformation ellipticity of the cylinder is usually optimized by simply adding stiffeners or other structural reinforcements. This approach lacks systematicity and precision, and is insufficient to meet the high efficiency and reliability requirements of modern steam turbines. Summary of the Invention

[0005] In view of the above problems, this application provides a method and apparatus for manufacturing a cylinder.

[0006] This application provides a method for manufacturing a cylinder, comprising: step S1, constructing a simulation model of the cylinder based on the cylinder's structural data; step S2, performing a thermodynamic simulation of the cylinder's operation based on the simulation model, and determining the ellipticity deformation of the cylinder under thermo-mechanical coupling based on the simulation results; step S3, adjusting the cylinder's structural data when the ellipticity deformation is determined to be outside a preset threshold range, and repeating steps S1 to S2 using the adjusted structural data until the ellipticity deformation corresponding to the adjusted structural data is within the threshold range; and step S4, manufacturing the cylinder using the ellipticity deformation corresponding to the adjusted structural data.

[0007] According to an embodiment of this application, a simulation model of a cylinder is constructed based on the cylinder's structural data, including: obtaining the cylinder's structural design form and structural design data, wherein the structural design form includes horizontally partitioned and vertically partitioned types; and constructing a simulation model of the cylinder based on the structural design form and structural design data.

[0008] According to an embodiment of this application, the cylinder's operation process includes a startup process and a stable operating process. The simulation results include thermodynamic parameter data of the cylinder during the startup and stable operating processes. Determining the ellipticity deformation of the cylinder under thermo-mechanical coupling based on the simulation results includes: determining the boundary conditions of the cylinder during the heat transfer analysis process based on the thermodynamic parameter data; determining the temperature distribution of the cylinder based on the boundary conditions; and determining the ellipticity deformation of the cylinder under thermo-mechanical coupling based on the temperature distribution.

[0009] According to an embodiment of this application, determining the ellipticity deformation of the cylinder under thermo-mechanical coupling based on the temperature distribution includes: obtaining the top radial deformation, bottom radial deformation, left radial deformation, and right radial deformation of the cylinder under thermo-mechanical coupling based on the temperature distribution; calculating the first sum of the top radial deformation and the bottom radial deformation, and the second sum of the left radial deformation and the right radial deformation, respectively; determining the difference between the first sum and the second sum, and taking the average of the differences as the ellipticity deformation of the cylinder under thermo-mechanical coupling.

[0010] According to an embodiment of this application, when it is determined that the ellipticity deformation amount is not within a preset threshold range, the structural data of the cylinder is adjusted, including: locating the position of the flange in the cylinder according to the ellipticity deformation amount; and making a cut in the position of the flange in the structural data of the cylinder to adjust the lateral deformation stiffness of the flange.

[0011] According to an embodiment of this application, the location of the flange includes the location of the flange bolt holes. Cutting the flange location includes: cutting the flange outside the flange bolt holes or cutting the flange inside the flange bolt holes in the cylinder structural data.

[0012] According to an embodiment of this application, locating the position of a flange in a cylinder based on the ellipticity deformation includes: determining the average temperature of the axial section at any target position in the cylinder based on the temperature distribution of the cylinder; determining the ellipticity of the target position based on the ellipticity deformation; and taking the target position as the flange position when both the ellipticity and the average temperature of the axial section meet preset conditions.

[0013] Another aspect of this application provides a cylinder manufacturing apparatus, comprising: a model building module for building a simulation model of the cylinder based on the cylinder's structural data; a numerical determination module for performing thermodynamic simulations of the cylinder's startup and stable operation processes based on the simulation model, and determining the ellipticity deformation of the cylinder under thermo-mechanical coupling based on the simulation results; a numerical adjustment module for adjusting the cylinder's structural data when the ellipticity deformation is determined to be outside a preset threshold range, and repeating the steps of building the cylinder's simulation model and determining the ellipticity deformation of the cylinder under thermo-mechanical coupling based on the simulation results using the adjusted structural data, until the ellipticity deformation corresponding to the adjusted structural data is within the threshold range; and a cylinder manufacturing module for manufacturing the cylinder based on the ellipticity deformation corresponding to the adjusted structural data.

[0014] The cylinder manufacturing method and apparatus based on the embodiments of this application can accurately calculate the ellipticity deformation of the turbine cylinder by performing thermodynamic simulation on the cylinder's operation process. By adjusting the ellipticity deformation, the system can be effectively optimized, thereby improving the turbine's operating efficiency and reliability, reducing maintenance costs, and extending the equipment's service life. Attached Figure Description

[0015] The above and other objects, features and advantages of this application will become clearer from the following description of embodiments with reference to the accompanying drawings, in which:

[0016] Figure 1 A flowchart illustrating a method for manufacturing a cylinder according to an embodiment of this application is shown schematically.

[0017] Figure 2 This schematically illustrates a flowchart of determining the ellipticity deformation of a cylinder under thermo-mechanical coupling based on simulation results, according to an embodiment of this application.

[0018] Figure 3 This schematic diagram illustrates a structure for cutting a flange location according to an embodiment of the present application.

[0019] Figure 4 A schematic block diagram of a cylinder manufacturing apparatus according to an embodiment of this application is shown. Detailed Implementation

[0020] The embodiments of this application will now be described with reference to the accompanying drawings. However, it should be understood that these descriptions are exemplary only and are not intended to limit the scope of this application. In the following detailed description, numerous specific details are set forth to provide a thorough understanding of the embodiments of this application for ease of explanation. However, it will be apparent that one or more embodiments may be implemented without these specific details. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concepts of this application.

[0021] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of this application. The terms “comprising,” “including,” etc., as used herein indicate the presence of features, steps, operations, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, or components.

[0022] All terms used herein (including technical and scientific terms) have the meanings commonly understood by those skilled in the art, unless otherwise defined. It should be noted that the terms used herein are to be interpreted in a manner consistent with the context of this specification, and not in an idealized or overly rigid way.

[0023] Figure 1 A flowchart illustrating a method for manufacturing a cylinder according to an embodiment of this application is shown.

[0024] like Figure 1 As shown, the cylinder manufacturing method of this embodiment includes steps S1 to S4.

[0025] In step S1, a simulation model of the cylinder is constructed based on the cylinder's structural data.

[0026] For example, the original structural data of the turbine cylinder can be input into a 3D solid modeling software to construct a 3D solid model of the turbine cylinder. The 3D solid model can be used to simplify the fine structures such as chamfers in the cylinder structural data, and the cylinder can be simplified according to its structure and stress characteristics. The simplified 3D solid model can then be imported into finite element analysis software for material data allocation and finite element mesh generation to obtain the simulation model of the cylinder.

[0027] For example, when the cylinder has a vertically symmetrical structure, the forces acting on the cylinder are symmetrical from left to right. Therefore, a 1 / 2 symmetrical model is used to construct the simulation model, and symmetrical boundary conditions are set in the symmetrical model.

[0028] In step S2, the operation process of the cylinder is simulated by thermodynamic simulation based on the simulation model, and the ellipticity deformation of the cylinder under thermo-solid coupling is determined based on the simulation results.

[0029] Simulation results of the turbine operation process are obtained using a simulation model. Thermo-structure interaction analysis is performed on the simulation model of the turbine cylinder to calculate the ellipticity deformation of the cylinder. The ellipticity deformation is the difference in radial deformation of the inner wall of the cylinder caused by non-uniform thermal expansion and mechanical load, which is manifested as ellipticization of the cross-section.

[0030] In step S3, if it is determined that the ellipticity deformation is not within the preset threshold range, the structural data of the cylinder is adjusted, and the above steps S1 to S2 are repeated using the adjusted structural data until the ellipticity deformation corresponding to the adjusted structural data is within the threshold range.

[0031] For example, the preset threshold range is that the absolute value of the ellipticity deformation of the cylinder at each axial position must be less than or equal to 0.5 mm. If there is an ellipticity deformation greater than 0.5 mm at any axial position of the cylinder, the structural data of the cylinder is adjusted. The steps of building the simulation model of the cylinder are repeated using the adjusted structural data until the ellipticity deformation of the cylinder under thermo-mechanical coupling is determined based on the simulation results, until the ellipticity deformation corresponding to the adjusted structural data is within the threshold range.

[0032] In step S4, the cylinder is manufactured using the ellipticity deformation amount corresponding to the adjusted structural data.

[0033] The cylinder manufacturing method based on the embodiments of this application accurately predicts the ellipticity deformation of the cylinder under real working conditions through thermodynamic simulation and thermo-mechanical coupling analysis of structural deformation. By setting a preset threshold range, it ensures that the deformation of the finally manufactured cylinder under thermal load is within the ideal range, which not only ensures operational safety but also improves the sealing performance and service life of the cylinder.

[0034] In the embodiments of this application, constructing a simulation model of the cylinder based on the cylinder's structural data includes: obtaining the cylinder's structural design form and structural design data, wherein the structural design form includes horizontally partitioned and vertically partitioned types; and constructing a simulation model of the cylinder based on the structural design form and structural design data.

[0035] For example, the structural design data of a cylinder includes: the cylinder's geometric dimensions (such as inner diameter, length, and flange thickness) and wall thickness distribution data (such as the design wall thickness values ​​at different locations of the cylinder).

[0036] The cylinder manufacturing method based on the embodiments of this application uses the cylinder structural design data for parametric modeling, ensuring a high degree of consistency between the simulation model and the physical design, thereby improving the efficiency and accuracy of cylinder design analysis.

[0037] Figure 2The flowchart illustrating the determination of the ellipticity deformation of a cylinder under thermo-mechanical coupling based on simulation results according to an embodiment of this application is shown in the illustration.

[0038] like Figure 2 As shown, in some embodiments, the operation of the cylinder in the above operation S2 includes a start-up process and a stable working process, and the simulation results include the thermodynamic parameter data of the cylinder under the start-up process and the stable working process; based on this, the ellipticity deformation of the cylinder under the thermo-mechanical coupling effect is determined according to the simulation results. The flowchart of determining the ellipticity deformation of the cylinder under the thermo-mechanical coupling effect according to the simulation results may further include steps S21 to S23.

[0039] In step S21, the boundary conditions of the cylinder during the heat exchange analysis are determined based on the thermodynamic parameter data of the cylinder during the start-up and stable operation processes.

[0040] For example, the thermodynamic parameter data of the turbine cylinder during startup and steady-state operation are one-dimensional thermodynamic analysis calculation result files at different times during startup and under steady-state rated operating conditions, specifically including parameters such as steam temperature, pressure, flow rate, enthalpy drop, and flow velocity.

[0041] For example, the boundary conditions of different regions in the cylinder during the heat transfer analysis process are determined. These different regions include: the circular pipe regions for steam inlet, extraction, and exhaust; the annular region between the rotor and the cylinder; the radial flow region between the cylinder walls; the annular region of the cylinder jacket; and the cylinder surface region between the blade stages. The calculation formulas for the heat transfer boundary conditions of different regions are shown below.

[0042] For example, the heat transfer coefficients of the circular pipe regions for steam inlet, extraction, and exhaust can be determined using the following formula:

[0043]

[0044]

[0045]

[0046] In the formula, The heat transfer coefficient is the coefficient of the circular pipe region for steam inlet, extraction, and exhaust. Thermal conductivity, For pipe diameter, For the length of the pipe, For vapor density, The steam flow rate is... For dynamic viscosity, For Nusselt numbers, The Reynolds number is the number of the fluid flow. It is a Prandtl number.

[0047] For example, the heat transfer coefficient of the annular region between the rotor and the cylinder can be determined using the following formula:

[0048]

[0049]

[0050]

[0051] In the formula, This is the heat transfer coefficient of the annular region between the rotor and the cylinder. Thermal conductivity, The inner diameter of the ring, The outer diameter of the ring, For vapor density, The steam flow rate is... For dynamic viscosity, For Nusselt numbers, The Reynolds number is the number of the fluid flow. It is a Prandtl number.

[0052] For example, the heat transfer coefficient of the radial flow region between cylinder walls can be determined using the following formula:

[0053]

[0054]

[0055]

[0056] In the formula, This is the heat transfer coefficient of the radial flow region between the cylinder walls. Thermal conductivity, For feature size, For vapor density, The steam flow rate is... For dynamic viscosity, For Nusselt numbers, The Reynolds number is the number of the fluid flow. It is a Prandtl number.

[0057] For example, the heat transfer coefficient of the annular region of the cylinder jacket can be determined using the following formula:

[0058]

[0059]

[0060]

[0061]

[0062] In the formula, The heat transfer coefficient of the annular region of the cylinder jacket. The axial heat transfer coefficient is... The circumferential heat transfer coefficient is... This refers to the axial or circumferential heat transfer coefficient. Thermal conductivity, These are axial or circumferential feature dimensions. For vapor density, The steam flow rate is... For dynamic viscosity, For Nusselt numbers, The Reynolds number is the number of the fluid flow. For Prandtl numbers, It can be either axial or circumferential.

[0063] For example, the heat transfer coefficient of the interstage cylinder surface region can be determined using the following formula:

[0064]

[0065]

[0066]

[0067]

[0068] In the formula, The heat transfer coefficient of the annular region of the cylinder jacket. The axial heat transfer coefficient is... The circumferential heat transfer coefficient is... Thermal conductivity, These are axial or circumferential feature dimensions. For axial feature dimensions, For circumferential feature dimensions, For vapor density, The steam flow rate is... For dynamic viscosity, The Reynolds number for axial fluid flow. The Reynolds number is the number of the circumferential fluid flow. The Reynolds number is used for axial or circumferential fluid flow. It is a Prandtl number.

[0069] In step S22, the temperature distribution of the cylinder is determined based on the boundary conditions.

[0070] Based on the boundary conditions of different regions of the cylinder, the temperature changes and temperature distribution of the cylinder during the start-up process and steady-state operation are calculated using finite element analysis software.

[0071] In step S23, the ellipticity deformation of the cylinder under thermo-solid coupling is determined based on the temperature distribution.

[0072] Based on the temperature distribution of the cylinder during startup and steady-state operation, the ellipticity deformation at various locations of the cylinder under thermo-mechanical coupling is obtained.

[0073] The cylinder manufacturing method based on the embodiments of this application dynamically determines the boundary conditions through thermodynamic parameter data, avoids manual setting errors, improves simulation reliability, and directly outputs the ellipticity deformation amount through thermo-mechanical coupling and structural mechanical effects, providing a quantitative basis for cylinder design, material selection or cooling system optimization, and reducing the failure risk caused by cylinder thermal deformation.

[0074] In the embodiments of this application, determining the ellipticity deformation of the cylinder under thermo-mechanical coupling based on the temperature distribution includes: obtaining the top radial deformation, bottom radial deformation, left radial deformation, and right radial deformation of the cylinder under thermo-mechanical coupling based on the temperature distribution; calculating the first sum of the top radial deformation and the bottom radial deformation, and the second sum of the left radial deformation and the right radial deformation, respectively; determining the difference between the first sum and the second sum, and taking the average of the differences as the ellipticity deformation of the cylinder under thermo-mechanical coupling.

[0075] For example, the ellipticity deformation of the cylinder under thermo-mechanical coupling. Use the following formula to determine.

[0076]

[0077] In the formula, This represents the radial deformation at the top. This represents the radial deformation at the bottom. This represents the radial deformation on the left side. This represents the radial deformation on the right side.

[0078] The cylinder manufacturing method based on the embodiments of this application directly reflects the ellipticization trend caused by the temperature gradient by separating the deformation in the vertical (top and bottom) and horizontal (left and right) directions, avoiding the ambiguity of the overall deformation. By performing differential averaging, the influence of local measurement errors is reduced, and the reliability of the results is improved.

[0079] In the embodiments of this application, when it is determined that the ellipticity deformation amount is not within a preset threshold range, the structural data of the cylinder is adjusted, including: locating the position of the flange in the cylinder according to the ellipticity deformation amount; and making a cut in the position of the flange in the structural data of the cylinder to adjust the lateral deformation stiffness of the flange.

[0080] The cylinder manufacturing method based on the embodiments of this application weakens the lateral deformation stiffness of the flange by cutting the slits, releases thermal stress in a directional manner, effectively suppresses the ellipticization trend, and flexibly adjusts the slit layout for different temperature distributions.

[0081] In the embodiments of this application, the position of the flange includes the location of the flange bolt holes. Cutting the flange position includes: cutting the flange outside the flange bolt holes or cutting the flange inside the flange bolt holes in the cylinder structural data.

[0082] Figure 3 The diagram illustrates a structural schematic of a flange location being cut according to an embodiment of this application.

[0083] like Figure 3 As shown, Figure 3 In (a) the flange position is cut, and a flange bolt hole 301 is selected on the outside of a flange bolt hole 301 within a preset range. In the cylinder structure data, the flange bolt hole 301 is cut from the outside of the flange bolt hole 301.

[0084] Figure 3 (b) Cutting the flange location: Select the flange area 303 in the middle of the flange bolt holes 301 within the preset range, cut the flange area 303 in the middle of the flange bolt holes 301 from the outside, and connect the stress relief hole 302 on the inside near the flange bolt holes 301.

[0085] The cylinder manufacturing method based on the embodiments of this application avoids the sealing surface and bolt bearing area by making cuts, ensuring that the connection strength and sealing performance are not compromised. Making cuts on the outside of the flange bolt holes can compensate for the thermal expansion of the flange outer edge and suppress elliptic deformation. Making cuts on the flange inside the flange bolt holes can optimize the bolt force transmission path and reduce the impact of cylinder thermal deformation on the sealing surface. The cylinder deformation direction is guided by the cuts, making the overall cylinder deformation closer to the preset uniform expansion mode.

[0086] In the embodiments of this application, locating the position of the flange in the cylinder based on the ellipticity deformation includes: determining the average temperature of the axial section at any target position in the cylinder based on the temperature distribution of the cylinder; determining the ellipticity of the target position based on the ellipticity deformation; and taking the target position as the flange position when both the ellipticity and the average temperature of the axial section meet preset conditions.

[0087] For example, the ellipticity of the target location and the average temperature of the axial section need to satisfy the following formula.

[0088]

[0089] In the formula, The average temperature of the axial section at the target location. This is the highest temperature in the cylinder. The ellipticity of the target location. This represents the maximum ellipticity of the cylinder.

[0090] The cylinder manufacturing method based on the embodiments of this application can more accurately determine the position of the flange in the cylinder by using ellipticity and average temperature of the axial section, thereby improving the manufacturing accuracy of the cylinder.

[0091] Based on the above-described cylinder manufacturing method, this application also provides a cylinder manufacturing apparatus. The following will be combined with... Figure 4 The device is described in detail.

[0092] Figure 4 A schematic block diagram of a cylinder manufacturing apparatus according to an embodiment of this application is shown.

[0093] like Figure 4 As shown, the cylinder manufacturing apparatus 400 of this embodiment includes a model building module 410, a value determination module 420, a value adjustment module 430, and a cylinder manufacturing module 440.

[0094] The model building module 410 is used to build a simulation model of the cylinder based on the cylinder's structural data. In one embodiment, the model building module 410 can be used to perform step S1 as described above, which will not be repeated here.

[0095] The numerical determination module 420 is used to perform thermodynamic simulations of the cylinder's start-up and stable operation processes based on the simulation model, and to determine the ellipticity deformation of the cylinder under thermo-mechanical coupling based on the simulation results. In one embodiment, the numerical determination module 420 can be used to execute step S2 described above, which will not be repeated here.

[0096] The numerical adjustment module 430 is used to adjust the cylinder's structural data when the ellipticity deformation is determined to be outside a preset threshold range. The adjusted structural data is used to repeat the steps of constructing a simulation model of the cylinder until the ellipticity deformation of the cylinder under thermo-mechanical coupling is determined based on the simulation results, until the ellipticity deformation corresponding to the adjusted structural data falls within the threshold range. In one embodiment, the numerical adjustment module 430 can be used to execute step S3 described above, which will not be repeated here.

[0097] The cylinder manufacturing module 440 is used to manufacture the cylinder according to the ellipticity deformation amount corresponding to the adjusted structural data. In one embodiment, the cylinder manufacturing module 440 can be used to perform step S4 described above, which will not be repeated here.

[0098] According to embodiments of this application, any plurality of modules among the model building module 410, the numerical determination module 420, the numerical adjustment module 430, and the cylinder manufacturing module 440 can be combined into one module, or any one of these modules can be split into multiple modules. Alternatively, at least part of the functionality of one or more of these modules can be combined with at least part of the functionality of other modules and implemented in one module. According to embodiments of this application, at least one of the model building module 410, the numerical determination module 420, the numerical adjustment module 430, and the cylinder manufacturing module 440 can be at least partially implemented as hardware circuitry, such as a field-programmable gate array (FPGA), a programmable logic array (PLA), a system-on-a-chip, a system-on-a-substrate, a system-on-package, an application-specific integrated circuit (ASIC), or any other reasonable means of integrating or packaging the circuitry, or implemented in any one of the three methods of software, hardware, and firmware, or in a suitable combination of any of these. Alternatively, at least one of the model building module 410, the numerical determination module 420, the numerical adjustment module 430, and the cylinder manufacturing module 440 can be at least partially implemented as a computer program module, which can perform corresponding functions when the computer program module is run.

[0099] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of apparatuses and methods according to various embodiments of this application. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two consecutively indicated blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in a block diagram or flowchart, and combinations of blocks in a block diagram or flowchart, may be implemented using a dedicated hardware-based system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions.

[0100] Those skilled in the art will understand that the features described in the various embodiments of this application can be combined or combined in various ways, even if such combinations or combinations are not explicitly described in this application. In particular, the features described in the various embodiments of this application can be combined or combined in various ways without departing from the spirit and teachings of this application. All such combinations or combinations fall within the scope of this application.

[0101] The embodiments of this application have been described above. However, these embodiments are merely illustrative and not intended to limit the scope of this application. Although various embodiments have been described above, this does not mean that the measures in the various embodiments cannot be used advantageously in combination. Without departing from the scope of this application, those skilled in the art can make various substitutions and modifications, all of which should fall within the scope of this application.

Claims

1. A method for manufacturing a cylinder, characterized in that, include: Step S1: Construct a simulation model of the cylinder based on the structural data of the cylinder; Step S2: Perform thermodynamic simulation of the cylinder's operation process based on the simulation model, and determine the ellipticity deformation of the cylinder under thermo-solid coupling based on the simulation results; The cylinder's operation includes a startup process and a stable operating process. The simulation results include thermodynamic parameter data of the cylinder at different times during startup and during stable operating. The ellipticity deformation of the cylinder under thermo-mechanical coupling is determined based on the simulation results, including: determining the boundary conditions of different regions in the cylinder during heat transfer analysis based on the thermodynamic parameter data; these different regions include the circular pipe regions for steam inlet, extraction, and exhaust; the annular region between the rotor and cylinder; the radial flow region between the cylinder walls; the annular region of the cylinder jacket; and the cylinder surface region between the blade stages. The temperature distribution of the cylinder is determined based on the boundary conditions. Finally, the ellipticity deformation of the cylinder under thermo-mechanical coupling is determined based on the temperature distribution. Step S3: If the ellipticity deformation is determined to be outside the preset threshold range, the structural data of the cylinder is adjusted. Steps S1 to S2 are repeated using the adjusted structural data until the ellipticity deformation corresponding to the adjusted structural data is within the threshold range. Adjusting the structural data of the cylinder when the ellipticity deformation is determined to be outside the preset threshold range includes: locating the position of the flange in the cylinder based on the ellipticity deformation; and making a cut in the flange position within the cylinder's structural data to adjust the lateral deformation stiffness of the flange. The step of locating the flange position in the cylinder based on the ellipticity deformation includes: determining the average axial section temperature at any target position in the cylinder based on the temperature distribution of the cylinder; determining the ellipticity of the target position based on the ellipticity deformation; and taking the target position as the flange position when both the ellipticity and the average axial section temperature meet preset conditions, wherein the preset conditions include the cylinder's highest temperature being greater than or equal to 0.8 times the average axial section temperature, and the cylinder's maximum ellipticity being greater than or equal to 0.8 times the average ellipticity. The location of the flange includes the location of the flange bolt holes. Cutting the flange location includes: cutting the flange outside the flange bolt holes in the cylinder structural data or cutting the flange inside the flange bolt holes. Step S4: The cylinder is manufactured using the ellipticity deformation amount corresponding to the adjusted structural data.

2. The method according to claim 1, characterized in that, Based on the structural data of the cylinder, a simulation model of the cylinder is constructed, including: Obtain the structural design form and structural design data of the cylinder, wherein the structural design form includes horizontal split type and vertical split type; Based on the structural design form and the structural design data, a simulation model of the cylinder is constructed.

3. The method according to claim 1, characterized in that, Based on the temperature distribution, the ellipticity deformation of the cylinder under thermo-mechanical coupling is determined, including: Based on the temperature distribution, the top radial deformation, bottom radial deformation, left radial deformation, and right radial deformation of the cylinder under thermo-solid coupling are obtained. Calculate the first sum of the top radial deformation and the bottom radial deformation, and the second sum of the left radial deformation and the right radial deformation, respectively; The difference between the first sum and the second sum is determined, and the average value of the difference is taken as the ellipticity deformation of the cylinder under thermo-solid coupling.

4. A cylinder manufacturing apparatus, characterized in that, include: The model building module is used to build a simulation model of the cylinder based on the structural data of the cylinder; The numerical determination module is used to perform thermodynamic simulation of the cylinder's start-up and stable operation processes based on the simulation model, and to determine the ellipticity deformation of the cylinder under thermo-mechanical coupling based on the simulation results. The cylinder's operation includes a startup process and a stable operating process. The simulation results include thermodynamic parameter data of the cylinder at different times during startup and during stable operating. The ellipticity deformation of the cylinder under thermo-mechanical coupling is determined based on the simulation results, including: determining the boundary conditions of different regions in the cylinder during heat transfer analysis based on the thermodynamic parameter data; these different regions include the circular pipe regions for steam inlet, extraction, and exhaust; the annular region between the rotor and cylinder; the radial flow region between the cylinder walls; the annular region of the cylinder jacket; and the cylinder surface region between the blade stages. The temperature distribution of the cylinder is determined based on the boundary conditions. Finally, the ellipticity deformation of the cylinder under thermo-mechanical coupling is determined based on the temperature distribution. The numerical adjustment module is used to adjust the structural data of the cylinder when it is determined that the ellipticity deformation is not within a preset threshold range. The adjusted structural data is then used to repeat the steps of constructing the simulation model of the cylinder up to determining the ellipticity deformation of the cylinder under thermo-mechanical coupling based on the simulation results, until the ellipticity deformation corresponding to the adjusted structural data is within the threshold range. Specifically, adjusting the structural data of the cylinder when it is determined that the ellipticity deformation is not within the preset threshold range includes: locating the position of the flange in the cylinder based on the ellipticity deformation; and performing a slit treatment on the flange position in the cylinder's structural data to adjust the lateral deformation stiffness of the flange. The step of locating the flange position in the cylinder based on the ellipticity deformation includes: determining the average axial section temperature at any target position in the cylinder based on the temperature distribution of the cylinder; determining the ellipticity of the target position based on the ellipticity deformation; and taking the target position as the flange position when both the ellipticity and the average axial section temperature meet preset conditions. The location of the flange includes the location of the flange bolt holes. Cutting the flange location includes: cutting the flange outside the flange bolt holes in the cylinder structural data or cutting the flange inside the flange bolt holes. The cylinder manufacturing module is used to manufacture the cylinder according to the ellipticity deformation amount corresponding to the adjusted structural data.

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