CN108071428B - Shaft jacking oil system of steam turbine rotor and working method thereof - Google Patents
Shaft jacking oil system of steam turbine rotor and working method thereof Download PDFInfo
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- CN108071428B CN108071428B CN201711213638.3A CN201711213638A CN108071428B CN 108071428 B CN108071428 B CN 108071428B CN 201711213638 A CN201711213638 A CN 201711213638A CN 108071428 B CN108071428 B CN 108071428B
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- outlet pressure
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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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- 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
- F01D21/00—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for
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- General Engineering & Computer Science (AREA)
- Support Of The Bearing (AREA)
- Sliding-Contact Bearings (AREA)
Abstract
The invention belongs to the technical field of steam turbine control, and discloses a jacking oil system of a steam turbine rotor and a working method thereof, which can realize a function of time delay adjustment of the jacking oil pressure and comprise the following steps: the oil tank, the inlet manual valve, the top shaft oil pump, the filter screen, the outlet pressure manual regulating valve, the outlet pressure automatic regulating valve and the bearing bush are connected in sequence through pipelines; the automatic outlet pressure regulating valve is characterized by further comprising a controller, wherein an outlet pressure collecting end of the automatic outlet pressure regulating valve is connected with a first signal input end of the controller, a starting/stopping signal collecting end of the jacking oil pump is connected with a second signal input end of the controller, a signal output end of the controller is connected with a control signal input end of the automatic outlet pressure regulating valve, and the control signal is used for regulating the opening degree of the automatic outlet pressure regulating valve.
Description
Technical Field
The invention belongs to the technical field of steam turbine control, and particularly relates to a shaft jacking oil system of a steam turbine rotor and a working method of the shaft jacking oil system.
Background
A plain bearing refers to a bearing that operates under sliding friction. The sliding bearing works stably and reliably without noise. Under the condition of liquid lubrication, the sliding surfaces are separated by lubricating oil without direct contact, so that the friction loss and the surface wear can be greatly reduced, and meanwhile, the oil film also has certain vibration absorption capacity and can reduce the vibration, but the starting friction resistance of the sliding bearing is larger.
The turbine rotor is usually supported by a sliding bearing, and a portion of the shaft of the turbine rotor supported by the bearing is called a journal, and a part fitted to the journal is called a bearing shell. The jacking oil system is used for providing high-pressure jacking oil, so that a steam turbine rotor journal is separated from a bearing bush, a stable oil film is formed between the steam turbine rotor journal and the bearing bush, and the jacking oil system is a necessary condition for realizing liquid lubrication.
As shown in fig. 1, the working flow of the conventional jack oil system is as follows: the top shaft oil flows out of the oil tank 1, passes through the inlet manual valve 2 (normally operates fully), is boosted by the top shaft oil pump 3, is filtered by the filter screen 4 to remove impurities, flows through the outlet pressure manual regulating valve 5 to be properly throttled and depressurized, then enters the bearing bush 7 to form an oil film, and finally flows back to the oil tank 1.
Conventional quill oil system limitations: before the oil film is formed, a gap does not exist between the shaft diameter of the steam turbine and the bearing bush, at the moment, for a shaft jacking oil system, the resistance of the bearing bush is large, high shaft jacking oil pressure is needed to jack up a steam turbine rotor, and the oil film is formed. The opening degree of the manual regulation valve 5 corresponding to the jack shaft oil pressure at which the oil film can be formed in a certain bush is called the minimum required jack shaft oil pressure. Therefore, in the case of the conventional jack-up oil system, when the outlet pressure manual adjustment valve 5 is set, it is necessary to ensure that the opening degree of the outlet pressure manual adjustment valve 5 is larger than the minimum opening degree. After the oil film is formed, a gap exists between the shaft diameter of the steam turbine and the bearing bush, and the pressure of the jacking oil entering the bearing bush is in positive correlation with the thickness of the oil film formed in the bearing bush. Due to the minimum tip oil pressure, there is a minimum oil film thickness for a certain bearing shoe. The minimum oil film thickness is closely related to the shape of the bearing bush, and for a conventional jacking oil system, if the minimum oil film thickness of a certain bearing bush is greater than a standard value, only the bearing bush can be replaced, and the replacement of the bearing bush is time-consuming and labor-consuming and cannot fully utilize the old bearing bush.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, an object of the present invention is to provide a lift pin oil system of a steam turbine rotor and a working method thereof, which can achieve a function of adjusting the lift pin oil pressure in a delayed manner.
In order to achieve the purpose, the invention is realized by adopting the following technical scheme.
The first technical scheme is as follows:
a topping shaft oil system for a steam turbine rotor, comprising:
the oil tank, the inlet manual valve, the top shaft oil pump, the filter screen, the outlet pressure manual regulating valve, the outlet pressure automatic regulating valve and the bearing bush are connected in sequence through pipelines;
the jack oil system also comprises a controller, wherein two signal input ends and one signal output end are arranged on the controller;
the outlet pressure acquisition end of the outlet pressure automatic regulating valve is connected with the first signal input end of the controller, the start/stop signal acquisition end of the top shaft oil pump is connected with the second signal input end of the controller, the signal output end of the controller is connected with the control signal input end of the outlet pressure automatic regulating valve, and a control signal input through the control signal input end of the outlet pressure automatic regulating valve is used for regulating the opening degree of the outlet pressure automatic regulating valve.
The second technical scheme is as follows:
the working method of the top shaft oil system of the steam turbine rotor is applied to the top shaft oil system according to the first technical scheme, and comprises the following steps:
step 1, determining the lowest opening degree of an outlet pressure manual regulating valve; the minimum opening degree of the outlet pressure manual regulating valve is the opening degree of the outlet pressure manual regulating valve corresponding to the minimum jacking oil pressure required for forming a stable oil film on the bearing bush;
determining a delay time t1, wherein the delay time t1 is t2+ △ t, wherein △ t ∈ [2s, 5s ] and t2 represents the time required from the opening of the top shaft oil pump to the first formation of a stable oil film on the bearing bush;
step 3, determining the critical outlet pressure of the outlet pressure automatic regulating valve when a stable oil film with a specified thickness value is formed on the bearing bush;
step 4, storing the delay time and the critical outlet pressure in a controller, starting timing by the controller when the controller receives a top shaft oil pump starting signal, and sending a first control signal to an outlet pressure automatic regulating valve by the controller after the delay time, wherein the first control signal is used for controlling the opening of the outlet pressure automatic regulating valve to be gradually reduced;
and 5, recording the actual outlet pressure of the outlet pressure automatic regulating valve, and keeping the current opening of the outlet pressure automatic regulating valve when the actual outlet pressure of the outlet pressure automatic regulating valve is reduced to the critical outlet pressure, so that a stable oil film with a specified thickness value is formed on the bearing bush.
And 6, when the controller receives a top shaft oil pump stop signal, the controller sends a second control signal to the outlet pressure automatic regulating valve, and the second control signal is used for controlling the outlet pressure automatic regulating valve to be in the maximum opening degree.
The second technical scheme of the invention has the characteristics and further improvements that:
(1) in step 3, the critical outlet pressure of the outlet pressure automatic regulating valve is specifically as follows:
and when the thickness of the oil film formed on the bearing bush is larger than a specified thickness value, gradually reducing the opening of the outlet pressure automatic regulating valve until the thickness of the oil film formed on the bearing bush is reduced to the specified thickness value, recording the outlet pressure value of the outlet pressure automatic regulating valve, and taking the outlet pressure value as the critical outlet pressure.
The minimum oil film thickness is closely related to the shape of the bearing bush, and for a conventional jacking oil system, if the minimum oil film thickness of a certain bearing bush is greater than a standard value, only the bearing bush can be replaced, and the replacement of the bearing bush is time-consuming and labor-consuming and cannot fully utilize the old bearing bush. By applying the technology, the thickness of the oil film of the bearing bush can be adjusted under the condition that the original bearing bush is not changed, and time and labor are saved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a conventional oil jacking system according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a jack oil system according to an embodiment of the present invention;
fig. 3 is a schematic flow chart of a working method of a top shaft oil system according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
An embodiment of the present invention provides a top shaft oil system of a steam turbine rotor, as shown in fig. 2, the top shaft oil system includes: the oil tank, the inlet manual valve, the top shaft oil pump, the filter screen, the outlet pressure manual regulating valve, the outlet pressure automatic regulating valve and the bearing bush are connected in sequence through pipelines;
the jack oil system also comprises a controller, wherein two signal input ends and one signal output end are arranged on the controller;
the outlet pressure acquisition end of the outlet pressure automatic regulating valve is connected with the first signal input end of the controller, the start/stop signal acquisition end of the top shaft oil pump is connected with the second signal input end of the controller, the signal output end of the controller is connected with the control signal input end of the outlet pressure automatic regulating valve, and a control signal input through the control signal input end of the outlet pressure automatic regulating valve is used for regulating the opening degree of the outlet pressure automatic regulating valve.
Further, an embodiment of the present invention further provides a working method of a top shaft oil system, where the working method of the top shaft oil system is applied to the top shaft oil system described in the above embodiment, and a basic idea of the working method is as follows: the method comprises the steps of fully opening an automatic outlet pressure regulating valve, and performing a setting test on a manual outlet pressure regulating valve to ensure that the opening degree of the manual outlet pressure regulating valve is greater than the minimum opening degree so as to ensure that an oil film can be formed. The oil film thickness at this time was measured and recorded, and the time T required from the start of the top shaft oil pump to the formation of a stable oil film was measured.
And after the oil film is stabilized, keeping the opening of the outlet pressure manual regulating valve. If the thickness of the oil film is larger than a specified value, the outlet pressure automatic regulating valve is gradually closed, so that the pressure of the jacking oil entering the bearing bush is reduced, the thickness of the oil film is further reduced to the specified value, and the outlet pressure value K of the jacking oil behind the outlet pressure automatic regulating valve is recorded.
The delay time (which should be larger than T) and the pressure value K of the oil outlet of the jacking shaft are input into the controller. The functions that can be realized are as follows: 1, when a top shaft oil pump starting signal is transmitted to a controller, timing is started, and a closing instruction is sent to an outlet pressure automatic regulating valve after delay time, so that the outlet pressure automatic regulating valve is gradually closed, the outlet pressure of top shaft oil is gradually reduced, and the top shaft oil pump starting signal is stopped (the current opening degree of the outlet pressure automatic regulating valve is kept) until a top shaft oil outlet pressure feedback signal reaches K; and 2, when a top shaft oil pump stop signal is transmitted to the controller, the full-open outlet pressure automatic regulating valve.
Specifically, as shown in fig. 3, the working method includes:
step 1, determining the lowest opening degree of an outlet pressure manual regulating valve; the minimum opening degree of the outlet pressure manual regulating valve is the opening degree of the outlet pressure manual regulating valve corresponding to the minimum jacking oil pressure required for forming a stable oil film on the bearing bush;
determining a delay time t1, wherein the delay time t1 is t2+ △ t, wherein △ t ∈ [2s, 5s ] and t2 represents the time required from the opening of the top shaft oil pump to the first formation of a stable oil film on the bearing bush;
step 3, determining the critical outlet pressure of the outlet pressure automatic regulating valve when a stable oil film with a specified thickness value is formed on the bearing bush;
in step 3, the critical outlet pressure of the outlet pressure automatic regulating valve is specifically as follows: and when the thickness of the oil film formed on the bearing bush is larger than a specified thickness value, gradually reducing the opening of the outlet pressure automatic regulating valve until the thickness of the oil film formed on the bearing bush is reduced to the specified thickness value, recording the outlet pressure value of the outlet pressure automatic regulating valve, and taking the outlet pressure value as the critical outlet pressure.
Step 4, storing the delay time and the critical outlet pressure in a controller, starting timing by the controller when the controller receives a top shaft oil pump starting signal, and sending a first control signal to an outlet pressure automatic regulating valve by the controller after the delay time, wherein the first control signal is used for controlling the opening of the outlet pressure automatic regulating valve to be gradually reduced;
and 5, recording the actual outlet pressure of the outlet pressure automatic regulating valve, and keeping the current opening of the outlet pressure automatic regulating valve when the actual outlet pressure of the outlet pressure automatic regulating valve is reduced to the critical outlet pressure, so that a stable oil film with a specified thickness value is formed on the bearing bush.
And 6, when the controller receives a top shaft oil pump stop signal, the controller sends a second control signal to the outlet pressure automatic regulating valve, and the second control signal is used for controlling the outlet pressure automatic regulating valve to be in the maximum opening degree.
The working method of the top shaft oil system provided by the embodiment of the invention comprises the following steps: after the top shaft oil pump is started, the automatic top shaft oil outlet pressure regulating valve is in a full-open position, the top shaft oil enters the bearing bush (the pressure of the top shaft oil is greater than the minimum top shaft oil pressure) at a higher pressure, and the steam turbine rotor is jacked up to form an oil film. And sending a starting signal of the top shaft oil pump to a controller, and after a certain time delay (at the moment, the steam turbine rotor should be jacked up), sending an instruction to the outlet pressure automatic regulating valve by the controller, so that the outlet pressure automatic regulating valve is gradually closed until the outlet pressure of the top shaft oil is reduced to a target value, and stopping the action. Along with the reduction of the pressure of the oil outlet of the jacking shaft, the jacking height of the corresponding bearing bush is reduced along with the reduction of the pressure of the oil outlet of the jacking shaft until the required height is reached. After the top shaft oil pump stops, the outlet pressure automatic regulating valve is automatically and fully opened.
Those of ordinary skill in the art will understand that: all or part of the steps for realizing the method embodiments can be completed by hardware related to program instructions, the program can be stored in a computer readable storage medium, and the program executes the steps comprising the method embodiments when executed; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (2)
1. A working method of a top shaft oil system of a steam turbine rotor is applied to the top shaft oil system of the steam turbine rotor, and the system comprises the following steps: the oil tank, the inlet manual valve, the top shaft oil pump, the filter screen, the outlet pressure manual regulating valve, the outlet pressure automatic regulating valve and the bearing bush are connected in sequence through pipelines; the jack oil system also comprises a controller, wherein two signal input ends and one signal output end are arranged on the controller; an outlet pressure acquisition end of the outlet pressure automatic regulating valve is connected with a first signal input end of the controller, a starting/stopping signal acquisition end of the top shaft oil pump is connected with a second signal input end of the controller, a signal output end of the controller is connected with a control signal input end of the outlet pressure automatic regulating valve, and a control signal input through the control signal input end of the outlet pressure automatic regulating valve is used for regulating the opening degree of the outlet pressure automatic regulating valve; the working method is characterized by comprising the following steps:
step 1, determining the lowest opening degree of an outlet pressure manual regulating valve; the minimum opening degree of the outlet pressure manual regulating valve is the opening degree of the outlet pressure manual regulating valve corresponding to the minimum jacking oil pressure required for forming a stable oil film on the bearing bush;
determining a delay time t1, wherein the delay time t1 is t2+ △ t, wherein △ t ∈ [2s, 5s ] and t2 represents the time required from the opening of the top shaft oil pump to the first formation of a stable oil film on the bearing bush;
step 3, determining the critical outlet pressure of the outlet pressure automatic regulating valve when a stable oil film with a specified thickness value is formed on the bearing bush;
step 4, storing the delay time and the critical outlet pressure in a controller, starting timing by the controller when the controller receives a top shaft oil pump starting signal, and sending a first control signal to an outlet pressure automatic regulating valve by the controller after the delay time, wherein the first control signal is used for controlling the opening of the outlet pressure automatic regulating valve to be gradually reduced;
step 5, recording the actual outlet pressure of the outlet pressure automatic regulating valve, and keeping the current opening of the outlet pressure automatic regulating valve when the actual outlet pressure of the outlet pressure automatic regulating valve is reduced to the critical outlet pressure, so that a stable oil film with a specified thickness value is formed on the bearing;
and 6, when the controller receives a top shaft oil pump stop signal, the controller sends a second control signal to the outlet pressure automatic regulating valve, and the second control signal is used for controlling the outlet pressure automatic regulating valve to be in the maximum opening degree.
2. The operating method of the lift shaft oil system of the steam turbine rotor according to claim 1, wherein in the step 3, the critical outlet pressure of the outlet pressure automatic regulating valve is specifically:
and when the thickness of the oil film formed on the bearing bush is larger than a specified thickness value, gradually reducing the opening of the outlet pressure automatic regulating valve until the thickness of the oil film formed on the bearing bush is reduced to the specified thickness value, recording the outlet pressure value of the outlet pressure automatic regulating valve, and taking the outlet pressure value as the critical outlet pressure.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711213638.3A CN108071428B (en) | 2017-11-28 | 2017-11-28 | Shaft jacking oil system of steam turbine rotor and working method thereof |
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| CN201711213638.3A CN108071428B (en) | 2017-11-28 | 2017-11-28 | Shaft jacking oil system of steam turbine rotor and working method thereof |
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| CN108071428A CN108071428A (en) | 2018-05-25 |
| CN108071428B true CN108071428B (en) | 2020-06-26 |
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| CN111502970B (en) * | 2020-04-20 | 2022-06-17 | 华润电力投资有限公司北方分公司 | Start-stop control method and system for top shaft oil pump and overflow electromagnetic valve |
| CN111691931A (en) * | 2020-05-23 | 2020-09-22 | 大唐双鸭山热电有限公司 | Oil pump control system for top shaft of plate car |
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| CN202402087U (en) * | 2011-11-09 | 2012-08-29 | 中国神华能源股份有限公司 | Jacking system of steam turbine rotor |
| CN202718718U (en) * | 2012-07-01 | 2013-02-06 | 杭州吉通机电有限公司 | Jack control device of turbine |
| CN205260080U (en) * | 2015-06-11 | 2016-05-25 | 大唐国际发电股份有限公司张家口发电厂 | Steam turbine jacking oil pump by path system |
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Address after: 710021 No.155, Fengcheng 7th Road, Xi'an Economic and Technological Development Zone, Shaanxi Province Applicant after: NORTHWEST ELECTRIC POWER RESEARCH INSTITUTE, CHINA DATANG CORPORATION SCIENCE ANDTECHNOLOGY RESEARCH INSTITUTE Co.,Ltd. Address before: 710021 Fengcheng seven road, Xi'an Economic Development Zone, Xi'an, Shaanxi Province, No. 155 Applicant before: NORTHWEST BRANCH OF CHINA DATANG CORPORATION SCIENCE AND TECHNOLOGY Research Institute |
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