Turbine rotor center adjusting method

Abstract

The invention discloses a steam turbine rotor center adjusting method, relates to the technical field of steam turbine transformation, and aims to solve the technical problems that in the prior art, the adjusting process is complex and prone to making mistakes, the adjusting precision of a shaft system rotor is difficult to guarantee, and a steam turbine is difficult to operate stably. According to the method, all the components are comprehensively and carefully checked before adjustment, when the adjustment amount of the bearing bush and the gasket is calculated, the adjustment numerical value can be accurately determined according to the similar triangle principle and a reasonable formula, and especially when the center of the shaft system is adjusted for the second time, the number of the adjustment bushes is reduced and the adjustment amount is accurately calculated according to the special situation after cylinder buckling. According to the method, the adjustment accuracy is greatly improved, the shafting rotor can efficiently reach the qualified range, good cooperation of all parts of the steam turbine is ensured, and therefore the operation stability and reliability of the steam turbine are improved, the service life of equipment is prolonged, and the equipment failure risk is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of steam turbine transformation, and more specifically, to a method for adjusting the center of a steam turbine rotor. Background Art

[0002] In the actual operation scenario of the power industry, the demand for steam turbine flow path transformation is extremely urgent, and its background is closely intertwined with the operating characteristics of the steam turbine itself and the industry development trend.

[0003] For early 300MW and 600MW class steam turbines, whether they are directly imported foreign models or domestic products optimized and improved based on them, a large number of problems have accumulated during long-term service. Due to long-term exposure to harsh working conditions of high temperature and high pressure, internal components of the steam turbine inevitably experience wear, deformation, etc. For example, the surface of the blades may become rough due to steam erosion and corrosion, and even small cracks may appear, which will seriously disrupt the normal flow trajectory of the steam flow, resulting in a significant increase in steam flow energy loss.

[0004] In terms of heat consumption rate, the heat consumption rates of these old steam turbines generally exceed the design expectations. A higher heat consumption rate means that more coal resources are required to generate the same amount of electricity during power generation, which not only greatly increases the power generation cost, reduces the economic benefits of the power plant, but also puts the power plant at a disadvantage in the market competition. Moreover, its narrow high-efficiency load range also severely restricts the operation flexibility of the unit. In the current situation of frequent power grid load fluctuations and increasing demand for deep peak shaving, the steam turbine is difficult to operate efficiently under different load conditions and cannot meet the requirements of the power system for rapid response and stable power supply of the unit. Therefore, it is necessary to carry out flow path transformation on the steam turbine, and in the flow path transformation of the steam turbine, rotor center adjustment is a key and complex link.

[0005] However, in the existing technology, there is usually a lack of such a comprehensive and detailed pre-inspection link for each component. Often, only the appearance of the coupling and the rotor is simply checked, and the subtle defects on the circumference and end face, as well as key parameters such as the bending degree, floating deviation, journal ovality, and taper of the rotor, are not deeply detected. This makes the basic data for subsequent adjustment inaccurate and easily leads to a series of problems. When calculating the adjustment amounts of the bearing bush and the gasket, empirical estimation methods are mostly used, without relying on the scientific principle of similar triangles and accurate formulas, and various influencing factors such as the relative position between the rotors and the coupling parameters are not fully considered, resulting in large adjustment numerical errors and strong blindness. Moreover, in the face of special situations such as after cylinder covering, there is no targeted strategy, and the number of adjusted bearings cannot be effectively reduced, making the adjustment process complex and error-prone. Eventually, it is difficult to ensure the adjustment accuracy of the shafting rotor, which in turn affects the stable operation of the steam turbine, increases the possibility of equipment failures, and reduces the service life of the equipment. In view of this, we propose a method for adjusting the center of a steam turbine rotor. Summary of the Invention

[0006] The object of the present invention is to overcome the deficiencies of the prior art, meet the actual needs, and provide a method for adjusting the center of a steam turbine rotor, so as to solve the technical problems in the current technology that the adjustment process is complex and error-prone, it is difficult to ensure the adjustment accuracy of the shafting rotor, and the steam turbine is difficult to operate stably.

[0007] To solve the above technical problems, the present invention provides the following technical solutions: A method for adjusting the center of a steam turbine rotor, comprising the following steps:

[0008] S1: Preparation work before adjusting the shafting center;

[0009] S2: Rotor center adjustment;

[0010] S201: Measure the coupling center data in the semi-full cylinder state, refer to the difference between the center data in the full-full cylinder state and the semi-full cylinder state when the equipment is disassembled to judge the adjustment amount, and perform shafting center adjustment;

[0011] S202: Taking the low-pressure A rotor as the reference, if there is not much adjustment amount, the low-pressure A rotor remains unchanged, adjust the high-pressure and middle-pressure rotor and the low-pressure B rotor, calculate the bearing pad adjustment amount and the gasket adjustment amount according to the principle of similar triangles, put the bearing pads and grind them to the qualified standard, and then perform shafting center measurement and adjustment again;

[0012] S203: When adjusting the shafting center for the second time, especially after the cylinder is closed and the shafting center is rechecked and the through-flow clearance adjustment is completed, reduce the number of adjusting pads, calculate the change amount of the opening and the change amount of the center difference for adjustment, and measure the data including the horizontal deflection and the oil baffle depression of each rotor after adjusting the shafting rotor to the qualified range.

[0013] Preferably, the step S1 includes the following steps:

[0014] S101: Check the end face and circumference of each coupling to ensure that they are smooth without burrs, scratches and uneven pits;

[0015] S102: Complete the inspection of the rotor bending, floating deviation, journal ovality and taper;

[0016] S103: Check and grind the contact of each support bearing pad and the contact of the support bearing white metal is qualified;

[0017] S104: Make special tools for finding the center, and prepare tools including dial indicators, gauge blocks, special clamps, mirrors, rotor limiters; for rotors placed for a long time, rotate the rotor several circles before measurement;

[0018] S105: Ensure that the water in the condenser has been drained, the expansion energy saver at the lower steam extraction port of the low-pressure cylinder has been unlocked, and the lower half of the low-pressure cylinder has been initially positioned.

[0019] S105: Before turning the rotor each time, ensure that there is no jamming in the coupling connecting pin, and there is no binding between the wire rope for turning the rotor or the temporary electric barring gear and the gear of the rotor.

[0020] S106: Install the dial indicator firmly, ensure that the extension line of the dial indicator rod for measuring the circumference is perpendicular to the axis line, and the same person operates when using the gauge block to measure the end face distance.

[0021] S107: Install special limiter tools at both ends of the rotor to limit the axial movement of the rotor, and copper or aluminum metal is used at the joint between the limiter and the rotor.

[0022] Preferably, the special centering tool includes a special clip for the dial indicator used for coupling centering, whose design and dimensions meet the accuracy requirements for coupling center measurement, and it is firmly installed on the coupling to ensure the stable position of the dial indicator during the measurement process.

[0023] Preferably, when checking the rotor bow, use a high-precision measuring instrument and operate according to the specified measuring points and measuring methods to accurately reflect the bow state of the rotor.

[0024] Preferably, when adjusting the shafting center, take the low-pressure A rotor as the reference rotor. If the center deviation of the low-pressure A rotor is within the predetermined allowable range, do not adjust the low-pressure A rotor and use it as the reference for adjusting other rotors; if it exceeds the allowable range, make corresponding adjustments to the low-pressure A rotor and consider the impact of its adjustment on the subsequent rotor adjustments.

[0025] Preferably, when adjusting the relative position of rotor 1 and rotor 2 during shafting center adjustment, according to the measured opening value a, the center difference b of coupling 1, the diameter of the coupling of rotor 1 the diameter of the coupling of rotor 2 the distance L1 from the end face of coupling 1 to bearing X, the distance L2 to bearing Y, and the distance L0 to the end face of coupling 2, calculate the adjustment amount of bearing X the adjustment amount of bearing Y When considering the adjustment amount b of the center difference, the total adjustment amount of bearing X the total adjustment amount of bearing Y

[0026] Preferably, when calculating the bearing adjustment amount and the gasket adjustment amount, when moving up and down, for the bearing directly below, the adjustment amount is directly added or subtracted by the corresponding adjustment amount ⊿a, and for the bearings on both sides, the adjustment amount is ⊿a×cosθ; when moving left and right, the bearing directly below is not adjusted, and the adjustment amount of the bearings on both sides is the adjustment amount ⊿b×sinθ, where θ is the angle between the position of the shim iron and the vertical central axis of the bearing.

[0027] Preferably, when grinding the bearing bush, the particle size and hardness of the grinding material are selected according to the material and processing accuracy requirements of the bearing bush. The grinding ensures the surface finish and dimensional accuracy of the bearing bush, and ensures that the clearance between the bearing bush and the rotor meets the technical requirements.

[0028] Preferably, during the second shafting center adjustment, after the cylinder is closed and the shafting center is rechecked and the through-flow clearance has been adjusted, the number of adjusting pads is reduced and adjusted, and the change amount of the opening The change amount b' of the center difference of the circle center = (L1 / L) × △Y', where L1 is the diameter of the corresponding coupling, L is the distance between two pads of the same rotor, and △Y' is the adjustment amount of the adjusting pad.

[0029] Preferably, during the shafting center adjustment in step S2, record the data of each measurement and adjustment, including but not limited to the coupling center data, the bearing bush adjustment amount, the gasket adjustment amount, and the rotor bending data, to form a data record document; after the shafting center adjustment is completed, carry out inspection and verification work, including checking whether the final data of the shafting center is within the specified tolerance range, and checking the parameters of the rotor including the vibration value, bearing temperature, and clearance between the static and moving parts, to ensure that the adjusted steam turbine meets the operation performance and safety requirements.

[0030] Compared with the prior art, the beneficial effects of the present invention are:

[0031] 1. Before adjustment, the present invention conducts a comprehensive and detailed inspection of each component, such as strict detection of the coupling and rotor and treatment of the bearing-related components, laying a solid foundation for subsequent adjustment. When calculating the adjustment amounts of the bearing bush and gasket, based on the principle of similar triangles and reasonable formulas, various factors are fully considered, and the adjustment values can be accurately determined, reducing the errors caused by blind adjustment. Especially during the second shafting center adjustment, for the special situation after the cylinder is closed, the number of adjusting pads is reduced and the adjustment amount is accurately calculated. The present invention greatly improves the accuracy of adjustment, enables the shafting rotor to efficiently reach the qualified range, ensures good cooperation between the components of the steam turbine, thereby improving the operation stability and reliability of the steam turbine, prolonging the service life of the equipment, and reducing the equipment failure risk.

[0032] 2. Starting from the preparatory work before the adjustment of the shafting center, each operation step has clear specifications. Measures such as making special tools, preparing measuring tools, and turning the rotor ensure the adequacy of the preparatory work. During the entire adjustment process, the data of each measurement and adjustment are recorded in detail to form a complete data record document, which is convenient for technicians to retrospectively analyze the adjustment process at any time, promptly discover possible problems and optimize them. After the adjustment is completed, comprehensive inspection and verification work cover key parameters such as shafting center data, rotor vibration values, bearing temperatures, and clearances between static and moving parts to ensure that the steam turbine meets the operating performance and safety requirements. The present invention provides a strong guarantee for the flow path transformation of the steam turbine, helps improve the construction quality and efficiency, reduces rework and maintenance costs, and enhances the overall operating efficiency of the power plant. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 is a schematic flow chart of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0034] Example 1, as Figure 1 shown, a method for adjusting the center of a steam turbine rotor according to the present invention includes the following steps:

[0035] S1: Preparatory work before the adjustment of the shafting center.

[0036] The step S1 includes the following steps:

[0037] S101: Check the end faces and circumferences of each coupling to ensure they are smooth without burrs, scratches, and uneven pits;

[0038] S102: Complete the inspection of the rotor camber, runout, journal ovality, and taper; when inspecting the rotor camber, use a high-precision measuring instrument and operate according to the specified measuring points and measuring methods to accurately reflect the bending state of the rotor.

[0039] S103: Check and grind the contact of each support bearing pad and ensure the qualified contact of the support bearing babbitt;

[0040] S104: Make special tools for centering and prepare tools including dial indicators, gauge blocks, special clamps, mirrors, and rotor limiters; for rotors placed for a long time, turn the rotor several circles before measurement; the special centering tools include special clamps for dial indicators used for coupling centering, whose design and dimensions meet the accuracy requirements for coupling center measurement and are firmly installed on the coupling to ensure the stable position of the dial indicator during the measurement process.

[0041] When manufacturing the special centering tool, advanced machining processes and high-precision manufacturing equipment should be adopted to ensure the dimensional accuracy and surface quality of the tool. For example, for the special clip for the dial indicator used in coupling centering, alloy steel with high strength, wear resistance and good thermal stability should be selected as the material. During the machining process, numerical control machining technology is used to ensure that the dimensional tolerances of all parts are controlled within a very small range. For example, the dimensional tolerance of the key installation part can be controlled within ±0.02 mm. At the same time, when designing the clip, its compatibility with different models of couplings should be considered. By adopting an adjustable structure or equipping with a variety of adaptor accessories, it can be firmly installed on various specifications of couplings and effectively reduce the influence of the tool's own errors on the measurement results during the measurement process.

[0042] S105: Ensure that the water in the condenser has been completely drained, the expansion energy-saving device at the lower steam extraction port of the low-pressure cylinder has been unlocked, and the lower inner cylinder of the low-pressure cylinder is initially in place;

[0043] S105: Before each rotation of the rotor, ensure that there is no jamming in the coupling connecting pins, and there is no binding between the wire rope or the temporary electric turning gear for turning the rotor and the gear of the rotor;

[0044] S106: Firmly install the dial indicator, ensure that the extension line of the dial indicator rod for measuring the circumference is perpendicular to the axis line, and the same person operates when using the gauge block to measure the end face distance;

[0045] S107: Install special limiter tools at both ends of the rotor to limit the axial movement of the rotor, and copper or aluminum metal is used at the joint between the limiter and the rotor.

[0046] For the inspection work in step S1, in addition to ensuring that the physical states of the coupling, rotor and bearing related components meet the requirements, a detailed inspection list and record form should also be established. When inspecting the coupling, in addition to the surface quality inspection, the tightening condition of its connecting bolts and the thread integrity should also be recorded. If it is found that the bolts have slight deformation or thread wear, they should be replaced in time to avoid loosening or poor connection during the subsequent adjustment process. In terms of the inspection of the rotor curvature, in addition to using high-precision instruments and operating according to regulations, multiple measurement points should be set at different axial positions and circumferential directions to form a comprehensive curvature measurement matrix, so as to more accurately analyze the curvature characteristics of the rotor and compare and analyze with historical data or standard data of similar units. If it is found that the curvature exceeds the normal range, the reasons should be further checked, such as whether there is uneven heating or mechanical stress concentration, etc., and corresponding repair measures should be taken, such as rotor straightening or replacing damaged components.

[0047] S2: Rotor center adjustment;

[0048] S201: Measure the coupling center data in the semi-full cylinder state. Refer to the center data comparison difference between the full-full cylinder state and the semi-full cylinder state during equipment disassembly to determine the adjustment amount, and perform shafting center adjustment.

[0049] During the shafting center adjustment, take the low-pressure A rotor as the reference rotor. If the center deviation of the low-pressure A rotor is within the predetermined allowable range, do not adjust the low-pressure A rotor and use it as the reference for adjusting other rotors; if it exceeds the allowable range, make corresponding adjustments to the low-pressure A rotor, and at the same time consider the impact of its adjustment on the subsequent rotor adjustment.

[0050] During the shafting center adjustment, for the relative position adjustment between rotor 1 and rotor 2, according to the measured opening value a, the center difference b of coupling 1, the coupling diameter of rotor 1 the coupling diameter of rotor 2 the distance L1 from the end face of coupling 1 to bearing X, the distance L2 to bearing Y, and the distance L0 to the end face of coupling 2, calculate the adjustment amount of bearing X the adjustment amount of bearing Y When considering the center difference adjustment amount b, the total adjustment amount of bearing X the total adjustment amount of bearing Y

[0051] During the adjustment process of step S2, when adjusting with the low-pressure A rotor as the reference, it is necessary to deeply analyze the original installation data and operation history data of the low-pressure A rotor. In addition to considering whether its center deviation is within the allowable range, attention should also be paid to its stability and change trend during long-term operation. If it is found that although the current center deviation of the low-pressure A rotor is within the allowable range, but there is a tendency of gradual deviation, a certain adjustment margin should be appropriately reserved during the adjustment process to ensure the stability of the shafting center during subsequent operation. For the relative position adjustment calculation between rotor 1 and rotor 2, in actual operation, the method of taking the average value of multiple measurements should be used to improve the accuracy of the measurement data. For example, for key data such as the opening value a and the center difference b of the coupling, multiple measurements should be carried out at different rotation angles and time intervals. After each measurement, analyze and screen the data, remove abnormal values, and then take the average value as the final calculation basis, which can effectively reduce the influence of measurement errors on the adjustment results.

[0052] S202: With the low-pressure A rotor as the reference, if there is not much adjustment amount, the low-pressure A rotor remains stationary, adjust the high-pressure and middle-pressure rotor and the low-pressure B rotor, calculate the bearing adjustment amount and gasket adjustment amount according to the principle of similar triangles, put the bearing in for grinding until it meets the qualified standard, and then measure and adjust the shafting center again.

[0053] When calculating the adjustment amount of the bearing bush and the gasket, when moving up and down, for the bearing bush directly below, the adjustment amount is directly added or subtracted by the corresponding adjustment amount ⊿a, and for the bearing bushes on both sides, the adjustment amount is ⊿a×cosθ; when moving left and right, the bearing bush directly below is not adjusted, and the adjustment amount of the bearing bushes on both sides is the adjustment amount ⊿b×sinθ, where θ is the angle between the position of the shim and the vertical central axis of the bearing bush.

[0054] In the process of calculating and adjusting the adjustment amount of the bearing bush and the gasket, an accurate mathematical model and calculation software should be established. By inputting the measurement data and the relevant parameters of the rotor and the bearing bush, the software can automatically calculate the accurate adjustment amount and generate detailed adjustment steps and operation guides. When adjusting the gasket, in addition to operating according to the calculated adjustment amount, strict control should be exerted on the material and surface quality of the gasket. Gaskets should be made of materials that meet the temperature and pressure requirements of the steam turbine operation, such as high-temperature resistant and corrosion-resistant metal gaskets or high-performance composite gaskets, and the gasket surface should be cleaned and polished before installation to ensure tight and uniform contact between it and the bearing bush and the bearing housing, avoiding problems such as poor contact or local stress concentration caused by improper gasket installation.

[0055] When grinding the bearing bush, the particle size and hardness of the grinding material are selected according to the material and machining accuracy requirements of the bearing bush. Grinding ensures the surface finish and dimensional accuracy of the bearing bush, and ensures that the clearance between the bearing bush and the rotor meets the technical requirements.

[0056] In the process of bearing bush grinding, in addition to selecting the appropriate grinding material, a scientific grinding process specification should also be formulated. The grinding process should be divided into multiple stages such as rough grinding, medium grinding, and fine grinding. Different particle sizes of grinding materials and corresponding grinding parameters are used in each stage. In the rough grinding stage, coarser grinding sand can be selected to quickly remove the machining allowance and uneven parts on the bearing bush surface; in the medium grinding stage, the particle size of the grinding sand is gradually reduced to improve the surface finish of the bearing bush; in the fine grinding stage, extremely fine-grained grinding paste is used for the final polishing treatment to make the bearing bush surface meet the mirror finish requirements. At the same time, during the grinding process, the grinding pressure and grinding speed should be strictly controlled. By real-time monitoring the dimensional changes and surface quality of the bearing bush, ensure that the dimensional accuracy and shape accuracy of the bearing bush meet the design requirements, such as controlling the roundness and taper of the bearing bush within ±0.002mm and the surface roughness reaching below Ra0.8.

[0057] S203: When adjusting the center of the shafting for the second time, especially when rechecking the center of the shafting after the cylinder is covered and the through-flow clearance has been adjusted, reduce the number of adjusting pads, calculate the change in the opening and the change in the center difference for adjustment. After adjusting the shafting rotor to the qualified range, measure the data including the horizontal deflection and the oil baffle depression of each rotor.

[0058] During the second shafting center adjustment, after the cylinder is closed and the shafting center is rechecked and the through-flow clearance has been adjusted, reduce the number of adjusting pads and make adjustments. The change in the opening The change in the center difference of the circle b'=(L1 / L)×△Y', where is the diameter of the corresponding coupling, L is the distance between two pads of the same rotor, and △Y' is the adjustment amount of the adjusting pad.

[0059] During the second shafting center adjustment, since the through-flow clearance has been adjusted, the requirement for adjustment accuracy is higher. While reducing the number of adjusting pads, high-precision measuring instruments and advanced measuring techniques should be used to monitor the adjustment process in real time. For example, a laser measuring instrument is used to dynamically monitor the position and center deviation of the rotor, and its measuring accuracy can reach ±0.005 mm, which can timely detect small deviations during the adjustment process and make corrections. When calculating the change in the opening and the change in the center difference of the circle, in addition to calculating according to the formula, the actual measured data should also be combined for correction and verification. If it is found that there is a large deviation between the calculated result and the actual measured data, the accuracy of the measured data and the applicability of the calculation formula should be rechecked, and the calculation formula should be optimized and adjusted if necessary to ensure the reliability of the adjustment result.

[0060] During the shafting center adjustment in step S2, record the data of each measurement and adjustment, including but not limited to the coupling center data, the pad adjustment amount, the gasket adjustment amount, and the rotor bending data, to form a data record document; after the shafting center adjustment is completed, carry out inspection and verification work, including checking whether the final data of the shafting center is within the specified tolerance range, and checking the parameters of the rotor including the vibration value, bearing temperature, and clearance between static and moving parts, to ensure that the adjusted steam turbine meets the operation performance and safety requirements.

[0061] During the entire shafting center adjustment process, data recording and management are crucial. Establish a dedicated database system to input and store the data of each measurement and adjustment in real time. The database should have functions such as data query, analysis, and report generation, which are convenient for technicians to view and analyze the data change trend during the adjustment process. At the same time, during the inspection and verification work after the shafting center adjustment is completed, in addition to checking the final data of the shafting center and the relevant parameters of the rotor, a simulated operation test should also be carried out. By starting the lubricating oil system and turning gear device of the steam turbine, monitor the changes in parameters such as the vibration and bearing temperature of the rotor under the low-speed rotation state, and comprehensively inspect the adjustment effect by simulating the actual operation conditions. If any abnormal situation is found during the simulated operation process, the cause should be analyzed in time and adjustments should be made to ensure that the steam turbine can operate safely, stably, and efficiently during the formal operation.

[0062] The embodiments disclosed in the present invention are preferred embodiments, but not limited thereto. Those of ordinary skill in the art can easily understand the spirit of the present invention based on the above embodiments and make different extensions and changes. However, as long as they do not depart from the spirit of the present invention, they are within the protection scope of the present invention.

Claims

1. A method for adjusting the center of a steam turbine rotor, characterized in that: The following steps are involved: S1: Preparation work before adjusting the axis center; S2: rotor center adjustment; S201: Measure the coupling center data in the half-full cylinder state, compare the center data of the full-full cylinder state and the half-full cylinder state when the equipment is disassembled, determine the adjustment amount, and adjust the shaft center; S202: Take the low-pressure A rotor as the reference. If there is not much adjustment, the low-pressure A rotor is kept unchanged. The high-pressure, medium-pressure rotor and the low-pressure B rotor are adjusted. The bearing adjustment amount and the gasket adjustment amount are calculated according to the principle of similar triangles. After the bearing is put in and ground to the qualified standard, the shaft center is measured and adjusted again. S203: When adjusting the shaft center for the second time, especially when the shaft center is rechecked after the cylinder is removed and the flow clearance has been adjusted, reduce the number of adjustment pads, calculate the change in opening and the change in center difference, and adjust the shaft rotor to the qualified range, then measure the data including the horizontal spring of each rotor and the oil retaining cavity.

2. A method for adjusting the center of a steam turbine rotor according to claim 1, characterized in that: The step S1 includes the following steps: S101: Check the end faces and circumferences of each coupling to ensure they are smooth without burrs, scratches or pits; S102: Complete the inspection of rotor curvature, drift, journal ovality and taper; S103: Check and grind the contact of each support bearing pad and make sure the support bearing tungsten carbide contact is qualified; S104: Make a special tool for centering, and prepare tools including a dial indicator, a gauge block, a special clip, a mirror, and a rotor stopper; for rotors that have been stored for a long time, rotate the rotor several times before measuring; S105: Ensure that the water in the condenser has been drained, the expansion energy saving of the steam extraction port at the lower part of the low-pressure cylinder has been unlocked, and the low-pressure inner lower cylinder is initially in place; S105: Before turning the rotor each time, ensure that there is no tension on the wheel connecting pins, and that there is no tension between the rotor turning wire rope or temporary electric turning gear and the rotor gear; S106: Install the dial indicator firmly, ensure that the extension line of the dial indicator rod for measuring the circumference intersects the axis line perpendicularly, and the same person operates when using the gauge block to measure the end face distance; S107: Special limiter tools are installed at both ends of the rotor to limit the axial movement of the rotor, and the joints between the limiter and the rotor are made of copper or aluminum metal.

3. A method for adjusting the center of a steam turbine rotor according to claim 2, characterized in that: The special centering tool includes a special dial indicator clip for coupling centering, the design and size of which meet the accuracy requirements of coupling center measurement and are firmly installed on the coupling to ensure that the position of the dial indicator is stable during the measurement process.

4. A method for adjusting the center of a steam turbine rotor according to claim 2, characterized in that: When inspecting the curvature of the rotor, a high-precision measuring instrument is used and the operation is performed in accordance with the prescribed measuring points and measuring methods to accurately reflect the curvature state of the rotor.

5. A method for adjusting the center of a steam turbine rotor according to claim 1, characterized in that: When adjusting the center of the shaft system, the low-pressure A rotor is used as the reference rotor. If the center deviation of the low-pressure A rotor is within the predetermined allowable range, the low-pressure A rotor is not adjusted and is used as a reference for adjusting other rotors. If it exceeds the allowable range, the low-pressure A rotor is adjusted accordingly, while considering the impact of its adjustment on subsequent rotor adjustments.

6. A method for adjusting the center of a steam turbine rotor according to claim 5, characterized in that: When the axis center is adjusted, the relative position of rotor 1 and rotor 2 is adjusted according to the measured opening value a, the center difference b of coupling 1, and the coupling diameter of rotor 1. Coupling diameter of rotor 2 Calculate the distance L1 from the end face of coupling 1 to the X-bearing, the distance L2 to the Y-bearing, and the distance L0 to the end face of coupling 2. When considering the center difference adjustment amount b, 7. A method for adjusting the center of a steam turbine rotor according to claim 6, characterized in that: When calculating the bearing adjustment amount and the shim adjustment amount, when moving up and down, the adjustment amount for the bearing directly below is the direct addition or subtraction of the corresponding adjustment amount ⊿a, and the adjustment amount for the bearings on both sides is ⊿a×cosθ; when moving left and right, the bearing directly below is not adjusted, and the adjustment amount for the bearings on both sides is the adjustment amount ⊿b×sinθ, where θ is the angle between the position of the shim and the vertical center axis of the bearing.

8. A method for adjusting the center of a steam turbine rotor according to claim 7, characterized in that: When grinding the bearing, the particle size and hardness of the grinding material are selected according to the material and processing accuracy requirements of the bearing. Grinding ensures the smoothness and dimensional accuracy of the bearing surface and ensures that the matching clearance between the bearing and the rotor meets the technical requirements.

9. A method for adjusting the center of a steam turbine rotor according to claim 8, characterized in that: During the second shaft center adjustment, after the cylinder is buckled, the shaft center is rechecked and the through-flow clearance has been adjusted. The number of adjustment pads is reduced and adjusted. The change in the center difference b' = (L1 / L) × △Y', where is the diameter of the corresponding coupling, L is the distance between the two bearings of the same rotor, and △Y' is the adjustment amount of the adjustment bearing.

10. A method for adjusting the center of a steam turbine rotor according to claim 9, characterized in that: During the shaft center adjustment process of step S2, the data of each measurement and adjustment is recorded, including but not limited to the coupling center data, bearing adjustment amount, gasket adjustment amount, and rotor curvature data, to form a data record document; after the shaft center adjustment is completed, inspection and verification work is carried out, including checking whether the final data of the shaft center is within the specified tolerance range, checking the rotor parameters including vibration value, bearing temperature, and clearance between moving and static parts, to ensure that the adjusted steam turbine meets the operating performance and safety requirements.

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