CN119617006A - A method for operating a tilting pad bearing jacking oil system for a steam turbine and a jacking device - Google Patents
A method for operating a tilting pad bearing jacking oil system for a steam turbine and a jacking device Download PDFInfo
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- CN119617006A CN119617006A CN202510152602.7A CN202510152602A CN119617006A CN 119617006 A CN119617006 A CN 119617006A CN 202510152602 A CN202510152602 A CN 202510152602A CN 119617006 A CN119617006 A CN 119617006A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/02—Parts of sliding-contact bearings
- F16C33/04—Brasses; Bushes; Linings
- F16C33/06—Sliding surface mainly made of metal
- F16C33/10—Construction relative to lubrication
- F16C33/1025—Construction relative to lubrication with liquid, e.g. oil, as lubricant
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/02—Parts of sliding-contact bearings
- F16C33/04—Brasses; Bushes; Linings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/02—Parts of sliding-contact bearings
- F16C33/04—Brasses; Bushes; Linings
- F16C33/06—Sliding surface mainly made of metal
- F16C33/10—Construction relative to lubrication
- F16C33/1025—Construction relative to lubrication with liquid, e.g. oil, as lubricant
- F16C33/106—Details of distribution or circulation inside the bearings, e.g. details of the bearing surfaces to affect flow or pressure of the liquid
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- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
- G06F16/20—Information retrieval; Database structures therefor; File system structures therefor of structured data, e.g. relational data
- G06F16/23—Updating
- G06F16/2358—Change logging, detection, and notification
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Theoretical Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Data Mining & Analysis (AREA)
- Databases & Information Systems (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Sliding-Contact Bearings (AREA)
Abstract
本发明涉及一种汽轮机可倾瓦轴承顶轴油系统运行方法及顶轴装置，运行方法包括：建立轴承工况、最佳油压、瓦块温度和轴系振动值之间的顶轴油系统运行数据库；机组在运行过程中，判断轴承内瓦块温度是否位于预设阈值范围内；若在，关闭顶轴油系统，轴承保持原运行方式；若大于，则判断最佳油压是否在运行数据库内被记录；若未被记录，则开启顶轴油系统，使得瓦块温度处于预设阈值范围内，获取最佳油压，并将上述最佳油压及最佳油压所对应的瓦块温度和轴系振动值记录至运行数据库内；若被记录，则开启顶轴油系统，使得油膜压力达到最佳油压，并保持运行。本发明中的调节方法能够满足新型电力系统中机组频繁、快速变负荷轴系稳定运行的需求。
The present invention relates to an operation method and a jacking device for a tilting pad bearing jacking oil system of a steam turbine, the operation method comprising: establishing a jacking oil system operation database between bearing working conditions, optimal oil pressure, pad temperature and shaft vibration value; during the operation of the unit, judging whether the pad temperature in the bearing is within a preset threshold range; if so, closing the jacking oil system and the bearing maintains the original operation mode; if greater than, judging whether the optimal oil pressure is recorded in the operation database; if not recorded, opening the jacking oil system so that the pad temperature is within the preset threshold range, obtaining the optimal oil pressure, and recording the above-mentioned optimal oil pressure and the pad temperature and shaft vibration value corresponding to the optimal oil pressure into the operation database; if recorded, opening the jacking oil system so that the oil film pressure reaches the optimal oil pressure and keeps operating. The adjustment method of the present invention can meet the requirements of stable operation of the shaft system of units with frequent and rapid load changes in new power systems.
Description
Technical Field
The invention relates to the technical field of steam turbines, in particular to an operation method of a tilting-pad bearing jacking oil system of a steam turbine and a jacking device.
Background
Tilting pad bearings are typically used in steam turbines, which are rocking-bearing bush type bearings, wherein the tilting bearings are accompanied by a jacking oil system in use, which provides lubricating oil into the bearings to jack up the rotor and avoid direct contact of the rotor with the pads, but in the prior art, the turbine uses the jacking oil system only during start-up, and the jacking oil system is withdrawn during daily operation of the unit, and the lubricating oil temperature is controlled by the lubricating oil system.
However, in the novel electric power system, the role of the coal motor group is converted into the peak shaving by the main power generation and matched with new energy, so that the guide unit operates under ultralow load and fast load change, the oil film pressure is unstable, the output of the lubricating oil pump is smaller, the lubricating oil injection direction is tangential to the rotation direction of the rotor, the top shaft pressure is insufficient, when the pressure is insufficient, the oil film is easy to crack and the bearing bush is worn, the temperature of the bearing bush is increased, even the phenomenon of fever is caused, the rotation of the rotating shaft in the steam turbine is influenced, and the maintenance can be carried out frequently, so that the maintenance cost is increased. Based on the problems, the invention provides a steam turbine tilting pad bearing jacking oil system operation method and a jacking device.
Disclosure of Invention
The invention provides a steam turbine tilting pad bearing jacking shaft oil system operation method and a jacking shaft device, which have the advantages of large oil pressure adjusting range and high speed, are favorable for meeting the requirements of frequent and rapid load-changing shafting stable operation of a unit in a novel power system, and improve the safety of the unit.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a method of regulating oil film pressure using a lift oil system, comprising:
establishing a top shaft oil system operation database among bearing working conditions, optimal oil pressure, pad temperature and shafting vibration values, wherein the top shaft oil system operation database is a blank database when initially established;
judging whether the temperature of a tile in a bearing is within a preset threshold value range or not in the running process of the unit;
if the temperature of the pad is within the preset threshold value range, the top shaft oil system is in a closed state, and the bearing keeps the original running mode;
if the pad temperature is greater than the maximum value of the preset threshold value, judging whether the optimal oil pressure under the running bearing working condition is recorded in a top shaft oil system running database;
If the optimal oil pressure is not recorded, starting a top shaft oil system, enabling the tile temperature to be in a preset threshold range, taking the oil pressure corresponding to the minimum shafting vibration value as the optimal oil pressure, and recording the tile temperature and the shafting vibration value corresponding to the optimal oil pressure and the optimal oil pressure to the top shaft oil system operation database under the bearing working condition;
if the optimal oil pressure is recorded, the top shaft oil system is started so that the oil film pressure reaches the optimal oil pressure and operates.
Preferably, when the pad temperature is greater than the maximum value of the preset threshold value and the optimal oil pressure is recorded in the top shaft oil system operation database in the operation process of the unit, the top shaft oil system is started, so that the oil film pressure reaches the optimal oil pressure and continuously operates, and after the pad temperature is stable, the top shaft oil system operation database is updated, and the updating step comprises the following steps:
firstly judging whether the segment tile temperature is within a preset threshold range;
If yes, updating the pad temperature and the shafting vibration value under the bearing working condition in the top shaft oil system operation database;
If not, starting the top shaft oil system, enabling the tile temperature to be in a preset threshold range, obtaining the optimal oil pressure corresponding to the minimum shafting vibration value, and updating the tile temperature and the shafting vibration value corresponding to the optimal oil pressure and the optimal oil pressure to the bearing working condition in the top shaft oil system operation database.
Preferably, after the operation database of the top shaft oil system is established, at least one optimal oil pressure, pad temperature and shafting vibration value under the bearing working condition are recorded in the unit operation process, and then whether the optimal oil pressure under the running bearing working condition is recorded in the operation database of the top shaft oil system is judged.
Preferably, the preset threshold range of the tile temperature is a factory specified tile operating temperature range at the time of shipping the tile.
Preferably, the bearing conditions are divided according to unit load and variable load rate.
The jacking device is arranged on a shoe block which is arranged at the bottom of a bearing and supports a rotor, is an oil inlet device of a jacking oil system, is used based on the operation method and comprises a one-way valve, a transition pipe joint and an oil pipe assembly, wherein the shoe block is provided with a mounting hole along the side wall which is axially arranged, the shoe block is provided with a jacking oil bag towards the side wall of the rotor, an oil way is arranged in the tile block, an inlet and an outlet of the oil way are respectively communicated with the mounting hole and the top shaft oil bag, the transition pipe joint is arranged at the orifice of the mounting hole, the one-way valve is arranged in the mounting hole, and the oil pipe assembly is connected with the transition pipe joint.
Preferably, the transition pipe joint is cast integrally with the shoe.
Compared with the prior art, the invention has the beneficial effects that:
1. the jacking oil system which is usually operated only in the starting process is applied to daily operation, and because the jacking oil pump has large power, large oil pressure adjusting range and high speed, the requirements of frequent and rapid load-changing shafting stable operation of the unit in the novel electric power system are met, and the safety of the unit is improved.
2. By establishing a blank top shaft oil system operation database, in the unit operation process, the database data is perfected, the oil pressure is regulated through the top shaft oil system, and the oil pressure is regulated by utilizing the top shaft oil system according to the recorded data of the top shaft oil system operation database under the same bearing working condition, so that a large amount of data testing time and testing cost can be saved, and the top shaft oil system is directly put into use, perfected in use and used as a basis for regulation.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a block diagram of a method according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a connection of a shoe to a spindle assembly in accordance with an embodiment of the present invention;
FIG. 3 is a schematic view of a tile in accordance with an embodiment of the present invention;
Fig. 4 is a schematic diagram of a top shaft oil pocket according to an embodiment of the present invention.
Reference numerals illustrate:
1. A tile; 11, an oil way, 12, a mounting hole, 13, a top shaft oil bag, 2, a top shaft device, 21, a transition pipe joint, 22, a one-way valve, 23, an oil pipe assembly, 231, a hard pipe, 232, a metal hose and 3, a tile body.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, unless explicitly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, mechanically connected, electrically connected, directly connected, indirectly connected via an intervening medium, or in communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
The tilting bearing in the steam turbine is provided with a top shaft oil system in use, wherein the top shaft oil system is in the prior art and generally comprises a motor, a high-pressure oil pump, a duplex filter, a plate filter, a pressure relay, an overflow valve, a one-way throttle valve and a top shaft device arranged on a tile. The high-pressure oil pump is connected with the motor, the pressure relay, the plate filter and the duplex filter, the plate filter is connected with the one-way throttle valve, the plate filter is further connected with the distributor, the overflow valve is connected with the duplex filter , specifically, high-pressure oil is provided through the high-pressure oil pump, oil filtered through the oil pump and the filter enters the bearing through the jacking device, a static pressure oil film is formed between the pad and the rotor, the rotor is jacked up, the rotor is prevented from being directly contacted with the pad to generate friction, but in the prior art, the turbine only uses the jacking oil system in the starting process, the jacking oil system is withdrawn in daily operation of the unit, the lubricating oil temperature is controlled by the lubricating oil system, but the output of the lubricating oil pump in the lubricating oil system is small, the lubricating oil spraying direction is always tangential to the rotating direction of the rotor, the jacking pressure is insufficient, the oil film is easy to crack and the bearing bush is easy to wear, the temperature of the bearing bush is raised, and even the phenomenon of fever is avoided, and the ultralow load and the quick load change operation of the unit cannot be satisfied.
The embodiment of the invention provides a method for operating a steam turbine tilting pad bearing top shaft oil system, which specifically comprises the following steps:
The method comprises the steps of firstly establishing a top shaft oil system operation database among bearing working conditions, optimal oil pressure, pad temperature and shafting vibration values, wherein the top shaft oil system operation database is a blank database when the initial establishment is carried out, then acquiring operation data of the bearing working conditions, the optimal oil pressure, the pad temperature and the shafting vibration values in the unit operation process, recording the data into the top shaft oil system operation database, filling data in the top shaft oil system operation database, and taking the data as reference data when the bearing working conditions are operated later.
Then, in the running process of the unit, judging whether the temperature of the pad in the bearing is within a preset threshold range or not; if the pad temperature is within the preset threshold value range, the oil film pressure is stable, so that the oil film can stably run, the top shaft oil system can be in a closed state, and the bearing can keep the original running mode to continue running; if the temperature of the pad exceeds the standard, namely, the pad temperature is higher than the maximum value of the preset threshold, the pad temperature is raised due to insufficient oil film pressure, thinner oil film and abrasion of the pad, oil pressure is required to be regulated at the moment, the pad temperature is reduced by regulating the oil pressure, and whether the optimal oil pressure under the running bearing working condition is recorded in a top shaft oil system running database is required to be judged before regulation, specifically, if the optimal oil pressure is not recorded, oil supply is required, the pad temperature under the running bearing working condition is reduced to be within the preset threshold range, specifically, a top shaft oil system is started, oil supply is carried out to the bearing, the top shaft oil pressure is regulated until the pad temperature is in the preset threshold range, the oil pressure corresponding to the lowest shafting vibration value is taken as the optimal oil pressure, the rotor running is the most stable at the moment, the pad temperature accords with the regulation, then the optimal oil pressure and the pad temperature corresponding to the optimal oil pressure are acquired, the optimal oil pressure and the vibration value are recorded in the top shaft oil system running database, thereby realizing that the top shaft oil system running database is realized, and finally, if the oil pressure of the optimal oil system running database is increased along with the running time of the set, the top shaft system is directly recorded, and all the oil pressure corresponding to the optimal oil pressure and the oil pressure system vibration value is recorded in the top shaft system running database, and the oil system is completely, and if the oil pressure is completely recorded and the oil system is completely and completely recorded, oil is supplied to the bearing, so that the oil film pressure value reaches the recorded value of the optimal oil pressure, and the state operation is kept, and the pad temperature can be reduced to be within the range of a preset threshold value, so that the bearing can stably operate.
In the adjusting method, an operation database of the top shaft oil system is firstly established, an initial blank database is established, then in the unit operation process, data in the operation database of the top shaft oil system is perfected while adjusting, oil pressure in the bearing operation process is adjusted through the top shaft oil system according to recorded data of the operation database of the top shaft oil system under the same bearing working condition, so that the optimal oil pressure is achieved, the temperature of a tile is stabilized within a preset threshold range, a large amount of data testing time and testing cost can be saved, moreover, the top shaft oil system which is usually operated only in the starting process is applied to daily operation, and an opening and oil pressure adjusting method is established.
The method is characterized in that after the jacking oil system supplies oil into the bearing, lubricating oil in the bearing cannot flow back even if the jacking oil system is closed, the lubricating oil in the bearing can be left in the bearing, the jacking oil system carries out oil pressure adjustment, namely, the adjustment of a fixed value (a specific adjustment value is determined by an operator) each time and is carried out for a period of time (about 1 minute), then the corresponding pad temperature and the corresponding shafting vibration value are obtained, when the pad temperature is in a preset threshold range, the oil pressure is adjusted through the fixed value, a plurality of shafting vibration values are obtained, then the oil pressure with the smallest shafting vibration value is taken as the optimal oil pressure, the oil pressure is adjusted to the optimal oil pressure through the jacking oil system, and the pad temperature, the oil pressure and the shafting vibration value can be directly obtained in a power plant measuring system, so that the method belongs to the prior art and is not repeated.
Furthermore, because the unit is aged, overhauled and the like, the optimal oil pressure corresponding to the same pad temperature is possibly changed, the operation database of the top shaft oil system is required to be updated and adjusted, so that the optimal oil pressure recorded by the operation database of the top shaft oil system is always suitable for the actual condition of the unit, and the method comprises the following specific steps:
When the temperature of the tile is larger than the maximum value of a preset threshold in the running process of the unit, and the optimal oil pressure is recorded in an operation database of the top axle oil system, starting the top axle oil system, supplying oil into a bearing, enabling the oil film pressure to reach the optimal oil pressure, continuously running for a period of time, after the temperature of the tile is stable (the fluctuation range is not more than 5%), firstly judging whether the temperature of the tile is in the preset threshold range or not, specifically, if the temperature of the tile is in the preset threshold range, acquiring the temperature of the tile and the vibration value of a shafting again, and then updating the temperature of the tile and the vibration value of the shafting again to the bearing working condition in the operation database of the top axle oil system, if the temperature of the tile is not in the preset threshold range, continuously adjusting the oil pressure of the top axle oil system, supplying oil into the bearing until the temperature of the tile is in the preset threshold range, acquiring the optimal oil pressure corresponding to the minimum vibration value of the shafting, and updating the temperature of the tile and the vibration value of the shafting corresponding to the optimal oil pressure to the vibration value of the shafting to the bearing working condition in the operation database of the top axle oil system.
Specifically, after the operation database of the top shaft oil system is established, in the running process of the unit, at least one optimal oil pressure under the working condition of the bearing, a pad temperature and a shafting vibration value corresponding to the optimal oil pressure are recorded, and whether the optimal oil pressure under the working condition of the running bearing is recorded in the operation database of the top shaft oil system is judged, so that the situation that no data exists in a blank database is avoided, and whether the optimal oil pressure is recorded is judged, so that unnecessary judging steps are saved.
Specifically, the preset threshold range of the tile temperature is the tile working temperature range specified by the manufacturing factory when the tile leaves the factory.
Specifically, the bearing working conditions are divided according to the unit load and the variable load rate, for example, the running load range of a certain unit is P 0~Pn, the variable load rate range is a 0%-an%, the load and the variable load rate change range can be divided into a plurality of discrete points, P 0、P2、P3、…Pn,a0%、a1%、a2%、…an%, and the distances are Δp and Δa respectively, so that the working conditions of the first load are divided as shown in table 1.
TABLE 1
The operating mode split for the second load is shown in table 2.
TABLE 2
The bearing working condition division of other loads is analogized in sequence, and through the bearing working condition division, data in actual operation can be classified into corresponding bearing working condition points, so that operation cluster analysis is realized, and a basis is provided for adjustment of the oil pressure of the top shaft.
The invention also discloses a jacking device which is used based on the operation method and used for ensuring oil pressure, as shown in fig. 2-4, the jacking device comprises a one-way valve 22, a transition pipe joint 21 and an oil pipe assembly 23, wherein a mounting hole 12 is formed in the side wall of the tile 1, which is axially arranged along the side wall of the tile, a jacking oil bag 13 is arranged on the side wall of the tile 1, which faces to a rotor, an oil way 11 is arranged in the tile 1, the inlet and the outlet of the oil way 11 are respectively communicated with the mounting hole 12 and the jacking oil bag 13, the transition pipe joint 21 is arranged at the orifice of the mounting hole 12, the one-way valve 22 is arranged in the mounting hole 12, one end of the oil pipe assembly 23 is connected with the transition pipe joint 21, and the other end of the oil pipe assembly is communicated with a duplex filter in the jacking oil system so as to form a finished oil supply system. The check valve 22 is arranged in the mounting hole 12 to enable lubricating oil to circulate unidirectionally, so that the lubricating oil in the bearing flows back after the high-pressure oil pump in the oil supply device stops working, the oil pressure in the top shaft oil pocket 13 can be ensured, the pressure of a static pressure oil film formed between the tile 1 and the rotor is ensured, and the tile 1 and the rotor are prevented from being bumped and ground.
Preferably, the oil tube assembly 23 comprises a rigid tube 231 and a metal hose 232 connected, wherein the rigid tube 231 is in communication with the transition joint 21 and the metal hose is in communication with the filter, such that the transition joint 21 and the shoe 1 have free play, such that the shoe 1 has a play to swing without affecting the swinging of the shoe 1.
Because the shoe 1 swings slightly in the running process of the bearing, the transitional joint of the traditional jackshaft device 2 and the shoe 1 are in threaded connection, the connection part of the transitional joint and the shoe 1 is easy to loosen, the pressure is accompanied by outward inclination, so that the oil pressure of the jackshaft is insufficient, the rotor is thinner than an oil film of the shoe 1 and even contacts with the shoe, the two can wear, and a series of running accidents are caused, preferably, in the embodiment, the transitional joint 21 and the shoe 1 are integrally cast, the relative running between the transitional joint 21 and the shoe 1 is avoided, the transitional joint 21 and the shoe 1 move synchronously, and the connection reliability and stability are ensured.
The above embodiments are only preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, but any insubstantial changes and substitutions made by those skilled in the art on the basis of the present invention are intended to be within the scope of the present invention as claimed.
Claims (7)
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| CN202510152602.7A CN119617006B (en) | 2025-02-12 | 2025-02-12 | Operation method of steam turbine tilting pad bearing jacking oil system and jacking device |
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