CN113153460B - High-level oil tank system for turbine lubricating oil - Google Patents
High-level oil tank system for turbine lubricating oil Download PDFInfo
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- CN113153460B CN113153460B CN202110101362.XA CN202110101362A CN113153460B CN 113153460 B CN113153460 B CN 113153460B CN 202110101362 A CN202110101362 A CN 202110101362A CN 113153460 B CN113153460 B CN 113153460B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/18—Lubricating arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/18—Lubricating arrangements
- F01D25/20—Lubricating arrangements using lubrication pumps
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- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Sliding-Contact Bearings (AREA)
Abstract
The invention discloses a turbine lubricating oil high-level oil tank system which comprises a main oil tank, an oil pump, an oil supply pipeline, a bearing tank and an oil return pipeline which are sequentially communicated according to the circulation sequence of lubricating oil, wherein the oil supply pipeline is communicated with an oil cooler, the oil supply pipeline is communicated with an oil filling pipeline, the oil filling pipeline is communicated with the high-level oil tank, and the high-level oil supply pipeline is communicated between the high-level oil tank and the bearing tank. The invention has the beneficial effects that: the existing system does not depend on an electrical system and can automatically and stably control the oil supply pressure, only has requirements on the lowest arrangement height of an oil tank and has no requirements on the structural form; the oil temperature and the oil level of the high-level oil tank can be maintained, and the online test function is realized. The invention can effectively reduce the volume of the high-level oil tank, reduce the arrangement requirement of the high-level oil tank, carry out periodic tests, enhance the safety of a lubricating oil system of a unit and avoid oil break and tile burning accidents.
Description
Technical Field
The invention relates to the technical field of turbine lubricating oil, in particular to a high-level oil tank system of turbine lubricating oil.
Background
The turbine lubricating oil system is very important in the operation of the unit, if the lubricating oil failure occurs, the unit can not normally supply oil, the unit stops operating, bearing bush burnout and bearing abrasion can occur, and even the serious consequence of fire disaster occurs, therefore, the unit is generally required to be provided with a high-level oil tank system so as to supply oil to the bearing when the lubricating oil system fails and meet the requirement of safe shutdown.
The lubricating oil supply pressure of the small unit is low, the oil quantity demand is low, the high-level oil tank is directly connected with the lubricating oil supply pipeline through a pipeline, and the system is very simple; however, with the development of high-parameter and large-scale of the steam turbine unit, the oil supply pressure of lubricating oil is correspondingly improved, the amount of lubricating oil required by the system is continuously increased, the unit is stopped for a long time, the volume required by a high-level oil tank is also increased, the original high-level oil tank system is not suitable any more, and basically, the unit with the power of more than 300MW cancels the setting of the high-level oil tank system of the lubricating oil in the actual production construction.
In recent power production, electrical elements of some old power plant lubricating oil system devices (a standby alternating-current oil pump and a direct-current oil pump) are aged, and after sudden failure of lubricating oil, the standby pump cannot be started in time, so that oil-cut and tile-burning failures occur for multiple times, and therefore, the 8.4.1 th notice of twenty-five key requirements for preventing power production accidents, which are issued by the national energy agency 2014 at 4, 15: the turbine should be equipped with a lubricating oil energy storage device (such as a high-level oil tank) with enough capacity, once a lubricating oil pump and a system are in failure, the energy storage device can ensure that a unit is safely shut down, bearing bush burnout and bearing abrasion do not occur, and before the unit is started, the lubricating oil energy storage device and the system thereof must have commissioning conditions, otherwise, the unit cannot be started. The unit without the lubricating oil accumulator is additionally arranged and washed during the overhaul period of the unit, and meets the requirement of operation conditions.
The application of the high-level oil tank on a large unit is restricted due to the defects of the original high-level oil tank system, and certain risks are brought to the operation of the unit.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a turbine lubricating oil high-level oil tank system, which reduces the volume requirement of a high-level oil tank to the maximum extent, meets the requirement of a turbine on idle oil supply, reduces the volume requirement of the high-level oil tank to the minimum, and has the functions of maintaining the oil temperature of the high-level oil tank and performing an online manual test; after the pressure of the lubricating oil of the unit is reduced, the lubricating oil is automatically put into the unit, stable oil pressure can be maintained, stable oil quantity is provided, and the unit is guaranteed to be safely shut down.
The invention is realized by the following technical scheme: a high-level oil tank system for turbine lubricating oil comprises a main oil tank, an oil pump, an oil supply pipeline, a bearing tank and an oil return pipeline which are sequentially communicated according to the circulation sequence of the lubricating oil, wherein an oil cooler is communicated with the oil supply pipeline, the oil supply pipeline is communicated with an oil filling pipeline, the oil filling pipeline is communicated with the high-level oil tank, and the high-level oil supply pipeline is communicated with the bearing tank.
Furthermore, in order to better realize the invention, an isolation valve and an electric oil filling valve are sequentially arranged on the oil filling pipeline according to the circulation direction of the lubricating oil; the electric oil filling valve is connected in parallel with an oil temperature pore plate.
Furthermore, in order to better realize the invention, a self-operated regulating valve, an oil drain check valve and an isolating valve are sequentially arranged on the high-level oil supply pipeline according to the flowing direction of lubricating oil, and a pressure guide pipe communicated with the self-operated regulating valve is communicated with a pipeline between the self-operated regulating valve and the oil drain check valve.
Furthermore, in order to better realize the invention, the self-operated regulating valve is connected with an oil supply pore plate in parallel.
Further, in order to better realize the invention, the oil drain check valve is connected with a gas drain hole plate in parallel.
Further, in order to better implement the invention, a high-level oil tank oil overflow pipeline is communicated between the high-level oil tank and the oil return pipeline.
Furthermore, in order to better realize the invention, a pipeline between the pressure guiding pipe and the oil drain check valve is communicated with a test pipeline communicated with an oil overflow pipeline of the high-level oil tank, and the test pipeline is sequentially provided with a pressure gauge, a test orifice plate and a manual test valve according to the flowing direction of lubricating oil.
Furthermore, in order to better realize the invention, the high-level oil tank is communicated with a breather valve.
Furthermore, in order to better realize the invention, the main oil tank is communicated with an accident oil tank through a main oil tank oil overflow pipeline.
The beneficial effect that this scheme obtained is:
(1) the system reduces the arrangement requirement of a high-level oil tank, the original system relies on gravity flow, the arrangement height and the structural form of the oil tank directly influence the oil supply time, the existing system can automatically control the oil supply pressure, only has the requirement on the minimum arrangement height of the oil tank, has no requirement on the structural form, and can select a proper structural form on site according to the arrangement space.
(2) The system meets the requirement of idle running oil supply of a steam turbine, simultaneously reduces the capacity requirement of a high-level oil tank to the minimum, after a lubricating oil system of a unit breaks down, the high-level oil tank is automatically put in, and can always stably and automatically control the oil supply pressure in the minimum oil supply pressure range of the system, compared with a mode of completely relying on gravity to flow automatically (when the oil level of the high-level oil tank is high, the oil supply pressure is high, the oil supply quantity is large, the effective oil supply time is short), the oil consumption of the system can be effectively reduced, and the volume of the high-level oil tank is reduced.
(3) The system automatically charges oil to the high-level oil tank, and can charge a small amount of high-temperature oil in front of the oil cooler during operation of the unit, so that the heat dissipation loss of the oil tank is balanced, and the oil temperature of the high-level oil tank can be kept in a reasonable range; especially in winter, the viscosity of the lubricating oil is maintained at the optimal state required by the unit, the flow resistance can be reduced, and the unit is safer.
(4) The system comprises a manual test pipeline, simulates the running state of the high-level oil tank, does not influence the running of the existing system, can carry out activity test regularly, and improves the reliability and the safety of the unit.
(5) The lubricating oil part and the high-level oil tank part of the system can be isolated and independently overhauled, and after the unit is stopped, the oil pump can be stopped to run without discharging oil of the high-level oil tank.
(6) The system is simple, does not change the original lubricating oil system, does not depend on an electrical system, has low failure rate, high reliability and low input cost, and is very convenient for the reconstruction of a newly-built unit or an old unit.
Drawings
FIG. 1 is a schematic diagram of a system architecture;
wherein 1-a steam turbine, 2-a bearing, 3-a bearing box, 4-a main oil tank, 5-an accident oil tank, 6-a high-level oil tank, 7-an oil pump, 8-an oil cooler, 9-an oil pump check valve, 10-an electric oil charging valve, 11-an oil temperature orifice plate, 12-a breather valve, 13-a self-operated regulating valve, 14-an oil discharging check valve, 15-B isolation valves, 16-an oil supply orifice plate, 17-an air discharging orifice plate, 18-a pressure gauge, 19-a test orifice plate, 20-a manual test valve, 21-an oil supply pipeline, 22-an oil return pipeline, 23-an oil charging pipeline, 24-a high-level oil supply pipeline, 25-a high-level oil tank overflow pipeline, 26-a pressure guide pipe, 27-a test pipeline and 28-a main oil tank overflow pipeline, 29-a isolation valve.
Detailed Description
The present invention will be described in further detail with reference to examples, but the embodiments of the present invention are not limited thereto.
Example 1:
as shown in fig. 1, in the present embodiment, a turbine lubricating oil high-level oil tank system includes a main oil tank 4, an oil pump 7, an oil supply pipeline 21, a bearing tank 3, and an oil return pipeline 22, which are sequentially communicated according to a lubricating oil circulation order, wherein an oil cooler 8 is communicated with the oil supply pipeline 21, the oil supply pipeline 21 is communicated with an oil filling pipeline 23, the oil filling pipeline 23 is communicated with a high-level oil tank 6, and a high-level oil supply pipeline 24 is communicated between the high-level oil tank 6 and the bearing tank 3.
The unit is in the working condition before starting, the oil pump 7 runs, and lubricating oil passes through the oil pump check valve 9 behind the oil pump 7 and then is supplied to the bearing 2 through the oil supply pipeline 21 and the oil cooler 8; the other path fills oil into the high-level oil tank 6 through an oil filling pipeline 23, and after the high-level oil tank is filled with the oil, the electric oil filling valve 10 is closed.
When the unit is in an operating condition, the oil pump 7 operates, and lubricating oil passes through the oil pump check valve 9 behind the pump and then is supplied to the bearing 2 through the oil supply pipeline 21 and the oil cooler 8 in one way; the other path fills oil to the high-level oil tank 6 through the oil filling pipeline 23 and the oil temperature pore plate 11, and the stability of the oil temperature and the oil level of the high-level oil tank 6 is maintained. The oil supply pipeline 21 is provided with an oil pump check valve 9, so that the lubricating oil is prevented from flowing back during oil supply, and the stability of the system is prevented from being influenced.
And under the working condition of unit lubricating oil failure, the oil pump 7 is stopped, and the oil supply pipeline 21 stops supplying oil. Lubricating oil in the high-level oil tank 6 is supplied to the bearing 2 through the high-level oil supply pipeline 24, so that the shutdown safety of the unit is guaranteed.
Example 2:
on the basis of the above embodiments, in this embodiment, the oil-filling pipeline 23 is provided with the a isolation valve 29 and the electric oil-filling valve 10 in sequence according to the flow direction of the lubricating oil; the electric oil filling valve 10 is connected in parallel with an oil temperature orifice plate 11. The electric oil fill valve 10 can control the communication or closing of the oil fill line 23 so as to be opened when oil filling is required and closed after filling.
Example 3:
in addition to the above embodiments, in the present embodiment, the self-operated regulating valve 13, the oil discharge check valve 14, and the B isolation valve 15 are sequentially disposed in the high-level oil supply line 24 in the flow direction of the lubricating oil, and a pressure guide pipe 26 communicating with the self-operated regulating valve 13 is communicated with a pipe between the self-operated regulating valve 13 and the oil discharge check valve 14.
In this embodiment, when the unit lubricating oil fails, the oil pump 7 is stopped, the pressure of the lubricating oil supply pipeline 21 is reduced, the oil discharge check valve 14 is automatically opened under the pressure difference, the lubricating oil in the high-level oil tank 6 is supplied to the bearing 2 through the self-operated regulating valve 13 and the oil supply orifice plate 16, the actuator of the self-operated regulating valve 13 automatically adjusts the opening degree according to the pressure after the valve through the pressure guiding pipe 26, the oil supply pressure is maintained to a set value, the return oil of the bearing tank 3 is discharged into the main oil tank 4 through the oil return pipeline 22, and the oil level of the main oil tank 4 rises.
Example 4:
on the basis of the above embodiments, in the present embodiment, the self-operated regulating valve 13 is connected in parallel with the oil supply orifice plate 16. The oil supply pore plate is in a certain proportion to the through-flow capacity of the self-operated regulating valve, so that the regulating capacity of the self-operated regulating valve is more accurate, and the system can still supply oil to the bearing through the oil supply pore plate under extreme working conditions even if the self-operated regulating valve fails, so that the safety of a unit is guaranteed to the maximum extent.
The oil drain check valve 14 is connected with a gas drain hole plate 17 in parallel. The air release hole plate can discharge air gathered by a pipeline in front of the oil release check valve, and oil cut-off is avoided when the high-level oil tank is put into operation.
Example 5:
on the basis of the above embodiment, in the present embodiment, a high-level tank oil-spilling pipeline 25 is communicated between the high-level tank 6 and the oil-returning pipeline 22. The communication port of the high-level oil tank oil overflow pipeline 25 and the high-level oil tank 6 is higher than the communication port of the oil filling pipeline 23 and the high-level oil tank 6. The liquid level in the high-level oil tank 6 can be controlled by using the high-level oil tank oil overflow pipeline 25, and when the liquid level of the lubricating oil exceeds the high-level oil tank oil overflow pipeline 25, the redundant lubricating oil can be discharged into the oil return pipeline 22 from the high-level oil tank oil overflow pipeline 25 and finally enters the main oil tank 4.
Example 6:
on the basis of the above embodiment, in this embodiment, the pipeline between the pressure guiding pipe 26 and the oil drain check valve 14 is communicated with a test pipeline 27 communicated with the high-level oil tank oil overflow pipeline 25, and the test pipeline 27 is sequentially provided with the pressure gauge 18, the test orifice plate 19 and the manual test valve 20 according to the flow direction of the lubricating oil.
In the test working condition, after the manual test valve 20 is opened, the lubricating oil in the high-level oil tank 6 passes through the self-operated regulating valve 13 and the oil supply pore plate 16, the opening of the self-operated regulating valve 13 is automatically adjusted according to the pressure after the valve through the pressure guiding pipe 26, the oil supply pressure is maintained to be a set value, the discharged oil in the test state is discharged into the high-level oil tank oil overflow pipeline 25 through the test pore plate 19 and the manual test valve 20, the test pore plate is calculated according to the oil quantity required by the system, the oil supply state of the system can be simulated, and the test can be performed regularly. The numerical value of the pressure gauge 18 is observed in the test process, and whether the working states of the system and the valve are normal or not can be judged.
Example 7:
in addition to the above embodiments, in the present embodiment, the breather valve 12 is communicated with the high-level tank 6. The breather valve 12 can control the air pressure in the high-level oil tank 6 to be consistent with the external atmospheric pressure, and the phenomenon that the oil supply efficiency is influenced due to inconsistent air pressure inside and outside the high-level oil tank 6 when the high-level oil tank 6 is used for supplying oil is avoided.
Example 8:
in addition to the above embodiments, in the present embodiment, the main oil tank 4 is communicated with the accident oil tank 5 through the main oil tank overflow pipeline 28. Under the working condition of the unit lubricating oil failure, the return oil of the bearing box 3 is discharged into the main oil tank 4 through the oil return pipeline 22, the oil level of the main oil tank 4 rises, and when the oil level reaches the main oil tank oil overflow pipeline 28, the redundant lubricating oil can be discharged into the accident oil tank 5 through the main oil tank oil overflow pipeline 28, so that the main oil tank 4 is prevented from being full of oil, and the unit is guaranteed to be stopped safely. When the steam turbine 1 stops working, the bearing 2 does not need to supply oil, the isolating valve B15 on the accident oil supply pipeline 24 and the isolating valve A29 on the oil charging pipeline 23 are closed, the high-level oil tank 6 keeps an oil storage state, the next starting of the turbine can be avoided from refilling oil when the turbine stops for a short time, the starting time of the turbine set is shortened, and the oil pump 7 is closed.
In this embodiment, other undescribed contents are the same as those in the above embodiment, and thus are not described again.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications and equivalent variations of the above embodiments according to the technical spirit of the present invention are included in the scope of the present invention.
Claims (8)
1. The utility model provides a high-order oil tank system of turbine lubricating oil, includes main oil tank (4), oil pump (7), oil supply line (21), bearing box (3) and return oil line (22) that communicate in proper order according to lubricating oil circulation, and the intercommunication has oil cooler (8), its characterized in that on oil supply line (21): the oil supply pipeline (21) is communicated with an oil filling pipeline (23), the oil filling pipeline (23) is communicated with a high-level oil tank (6), the high-level oil tank (6) is communicated with the bearing box (3) through a high-level oil supply pipeline (24), the high-level oil supply pipeline (24) is sequentially provided with a self-operated regulating valve (13), an oil drain check valve (14) and a B isolating valve (15) according to the flowing direction of lubricating oil, and a pressure guide pipe (26) communicated with the self-operated regulating valve (13) is communicated on a pipeline between the self-operated regulating valve (13) and the oil drain check valve (14).
2. The turbine lubricating oil high-level oil tank system according to claim 1, wherein: the oil filling pipeline (23) is sequentially provided with an A isolating valve (29) and an electric oil filling valve (10) according to the flowing direction of lubricating oil; the electric oil filling valve (10) is connected with an oil temperature pore plate (11) in parallel.
3. The turbine lubricating oil high-level oil tank system according to claim 1, wherein: the self-operated regulating valve (13) is connected with an oil supply pore plate (16) in parallel.
4. The turbine lubricating oil high-level oil tank system according to claim 1, wherein: the oil drain check valve (14) is connected with an air drain hole plate (17) in parallel.
5. The turbine lubricating oil high-level oil tank system according to any one of claims 1, 3 and 4, wherein: and an oil overflow pipeline (25) of the high-level oil tank is communicated between the high-level oil tank (6) and the oil return pipeline (22).
6. The turbine lubricating oil high-level oil tank system according to claim 5, wherein: and a test pipeline (27) communicated with the oil overflow pipeline (25) of the high-level oil tank is communicated with a pipeline between the pressure guiding pipe (26) and the oil drain check valve (14), and a pressure gauge (18), a test orifice plate (19) and a manual test valve (20) are sequentially arranged on the test pipeline (27) according to the flowing direction of lubricating oil.
7. The turbine lubricating oil high-level oil tank system according to any one of claims 1, 2, 3, 4 and 6, wherein: the high-level oil tank (6) is communicated with a breather valve (12).
8. The turbine lubricating oil high-level oil tank system according to any one of claims 1, 2, 3, 4 and 6, wherein: the main oil tank (4) is communicated with an accident oil tank (5) through a main oil tank oil overflow pipeline (28).
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| CN202110101362.XA CN113153460B (en) | 2021-01-26 | 2021-01-26 | High-level oil tank system for turbine lubricating oil |
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| CN202110101362.XA CN113153460B (en) | 2021-01-26 | 2021-01-26 | High-level oil tank system for turbine lubricating oil |
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| CN113153460B true CN113153460B (en) | 2022-03-25 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114198162B (en) * | 2021-11-30 | 2023-06-23 | 天津国能津能热电有限公司 | Oil supply device for bearing box of steam turbine |
| CN114718670B (en) * | 2022-02-28 | 2024-01-30 | 西安热工研究院有限公司 | Turbine lubrication oil level low protection self-intelligent adaptive identification method, system and equipment |
| CN115164080B (en) * | 2022-07-15 | 2024-04-05 | 东方电气集团东方电机有限公司 | Generator, starting method and shutdown method thereof, and computer readable storage medium |
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| GB690120A (en) * | 1950-07-18 | 1953-04-15 | English Electric Co Ltd | Improvements in and relating to the starting of gas turbines |
| GB1152187A (en) * | 1966-05-20 | 1969-05-14 | Bergmann Borsig Veb | Lubricating Oil Supply Apparatus |
| US4446377A (en) * | 1982-05-03 | 1984-05-01 | General Electric Company | Low collapse speed lube oil pumping system for turbomachinery |
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