CN114876592A - System and method for automatically adjusting bearing bush vibration of small-volume-flow lower-seat cylinder bearing - Google Patents
System and method for automatically adjusting bearing bush vibration of small-volume-flow lower-seat cylinder bearing Download PDFInfo
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- CN114876592A CN114876592A CN202210622986.0A CN202210622986A CN114876592A CN 114876592 A CN114876592 A CN 114876592A CN 202210622986 A CN202210622986 A CN 202210622986A CN 114876592 A CN114876592 A CN 114876592A
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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
- F01D25/04—Antivibration 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
- F01D21/00—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for
- F01D21/003—Arrangements for testing or measuring
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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
- F01D21/14—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for responsive to other specific conditions
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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
- F01D25/08—Cooling; Heating; Heat-insulation
- F01D25/12—Cooling
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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
- F01D25/16—Arrangement of bearings; Supporting or mounting bearings in casings
- F01D25/162—Bearing supports
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Turbines (AREA)
Abstract
The invention discloses a system and a method for automatically adjusting bearing bush vibration of a low-volume-flow lower-seat cylinder bearing. The bearing bush vibration automatic adjusting system comprises a steam turbine cylinder body, a bearing bush bearing seat, a bearing bush vibration tester, a temperature control system, a vacuum control system and a controller, wherein a condenser is arranged below the steam turbine cylinder body; the bearing bush vibration tester is used for testing the vibration value of the bearing bush; the temperature control system is used for adjusting the temperature of the steam exhaust area of the rear cylinder of the steam turbine; the vacuum control system is used for adjusting the vacuum degree of the condenser; the bearing bush vibration tester, the temperature control system and the vacuum control system are all electrically connected with the controller. On the premise of ensuring the small volume flow operation blast cooling effect, the invention comprehensively utilizes the adjusting means of the water spray flow of the rear cylinder of the steam turbine and the back pressure of the unit according to the vibration increasing condition of the bearing bush, improves the temperature of the steam exhaust area of the rear cylinder of the steam turbine, reduces the thermal expansion deviation between the cylinder shell of the cylinder bearing unit and the rotor bearing, and realizes the purpose of controlling the vibration of the bearing bush within the safe operation threshold.
Description
Technical Field
The invention relates to the technical field of steam turbines, in particular to a system and a method for automatically adjusting bearing bush vibration of a small-volume-flow lower-seat cylinder bearing.
Background
On the one hand, under the large background of great advocation of thermal power generating unit flexibility peak shaving and cogeneration, on the other hand, the requirements of a new energy large-scale high-proportion access network and power grid peak shaving capacity are remarkably increased; on the other hand, the demand of heating and heat supply keeps growing year by year, and the fact that the thermal power heat supply unit always operates under a small volume flow deviating from the design working condition is created together. Under the working condition of small volume flow of the steam turbine, the random internal volume flow is reduced, the flow state in the turbine formed by the blades is greatly changed, a steam inlet negative attack angle is generated, flow separation on the pressure surface of the blades and flow defluidization at blade roots are formed, and finally a series of problems of blast aggravation, cylinder deformation and the like are caused.
The cylinder bearing is widely applied by virtue of the advantages of compact structure and short shafting length. However, the rotor and steam load are firstly transmitted to the cylinder shell by the cylinder bearing and then transmitted to the foundation by the skirt support at the lower part of the cylinder body, so that the existence of the bearing bush clearance is influenced by the thermal expansion of the rotor bearing and the cylinder shell.
Aiming at the problem of small-volume-flow operation air blowing of a thermal power heat supply unit, the current main means is to increase in-cylinder cooling and reduce back pressure to inhibit air blowing heating. However, for a cylinder bearing unit, simply increasing in-cylinder cooling and reducing back pressure under a small volume flow also causes inconsistent thermal expansion of a cylinder shell and a rotor bearing, and a bearing bush clearance is relatively reduced, so that finally bearing bush vibration is continuously increased and exceeds a safe operation threshold, and the safe operation of a steam turbine is seriously challenged.
At present, to the axle bush vibration adjustment of sitting jar bearing under little volume flow, mainly rely on the increase of artifical adjustment operating parameter in order to alleviate axle bush vibration under the operating mode, nevertheless the control effect often is not good, has the effect that is suitable for it to react even.
Disclosure of Invention
Aiming at the technical problem that the vibration of a bearing bush of a small-volume-flow lower-seat cylinder bearing is difficult to adjust well by manpower in the technology, the invention provides a system and a method for automatically adjusting the vibration of the bearing bush of the small-volume-flow lower-seat cylinder bearing. The bearing bush vibration automatic adjusting system of the small-volume-flow lower-seat cylinder bearing provided by the invention comprehensively adjusts the water spray flow of the rear cylinder and the unit backpressure according to the vibration increasing condition of the bearing bush on the premise of ensuring the small-volume-flow operation blast cooling effect, and controls the bearing bush vibration to be within a safe operation threshold value.
On one hand, the invention provides a bearing bush vibration automatic adjusting system of a small-volume-flow lower-seat cylinder bearing, which comprises:
the steam turbine comprises a steam turbine cylinder body, wherein a condenser is arranged below the steam turbine cylinder body;
the cylinder bearing block is arranged, and the steam turbine cylinder body is connected with the steam turbine cylinder body through a bearing bush;
the bearing bush vibration tester is used for testing the vibration value of the bearing bush;
the temperature control system is used for adjusting the temperature of a steam exhaust area of a rear cylinder of the steam turbine;
the vacuum control system is used for adjusting the vacuum degree of the condenser;
the bearing bush vibration tester, the temperature control system and the vacuum control system are all electrically connected with the controller, and the bearing bush vibration tester transmits the measured vibration value of the bearing bush to the controller.
In some embodiments, an automatic adjustment system is activated when the vibration value of the bearing shell exceeds a safety threshold, and the controller adjusts the temperature control system and the vacuum control system according to a deviation of the vibration value of the bearing shell exceeding the safety threshold.
In some embodiments, the temperature control system comprises:
the water spray nozzles are arranged at the position of a rear cylinder of the steam turbine cylinder body;
the regulating valve is used for regulating the water spraying flow;
the water spraying flow tester is used for testing the water spraying flow and is arranged at the downstream of the regulating valve;
the temperature tester is used for testing the temperature of the steam exhaust area of the rear cylinder of the steam turbine and is arranged in the steam exhaust area of the cylinder body of the steam turbine.
In some embodiments, the temperature tester, the regulating valve and the water jet flow tester are electrically connected with the controller, the controller regulates and controls the opening degree of the regulating valve, the water jet flow tester transmits test data to the controller, and the temperature tester transmits temperature test data to the controller.
In some embodiments, the vacuum controller comprises:
the vacuum pressure tester is used for testing the vacuum value of the condenser;
the vacuum pump set is used for vacuumizing the condenser and is connected with the condenser through a pipeline, and the vacuum pressure tester is arranged on the pipeline between the vacuum pump set and the condenser;
a vacuum break valve disposed on a branch between the vacuum pressure tester and the vacuum pump set.
In some embodiments, the vacuum pressure tester, the vacuum pump set and the vacuum breaker valve are all electrically connected with the controller, the controller regulates and controls the frequency and the opening and closing of the vacuum pump set, the controller regulates and controls the opening of the vacuum breaker valve, and the vacuum pressure tester transmits test data to the controller.
In some embodiments, the vacuum pump set and the vacuum breaker valve cooperate to increase the vacuum breaker valve opening when the vacuum pump set is stopped or the frequency of the vacuum pump set is decreased; when the vacuum pump set is started or the frequency of the vacuum pump set is increased, the opening degree of the vacuum breaking valve is reduced.
On the other hand, the invention provides a method for automatically adjusting the vibration of a bearing bush of a low-volume-flow lower-seat cylinder bearing, which comprises the following steps of:
(1) judging whether the vibration value of the bearing bush exceeds a safety threshold value, and if the vibration value of the bearing bush does not exceed the safety threshold value, finishing the adjustment; if the vibration value of the bearing bush exceeds the safety threshold, calculating the deviation of the vibration value of the bearing bush and the safety threshold;
(2) the controller sends a control signal for increasing the temperature of the steam exhaust area of the rear cylinder of the steam turbine according to the deviation;
(3) judging whether the temperature of the steam exhaust area of the rear cylinder of the steam turbine exceeds an air blast temperature limit value or not, and finishing the adjustment if the temperature of the steam exhaust area of the rear cylinder of the steam turbine does not exceed the air blast temperature limit value; if the temperature of the steam exhaust area of the rear cylinder of the steam turbine exceeds the air blast temperature limit value, a controller sends out a control signal for reducing the temperature of the steam exhaust area of the rear cylinder of the steam turbine;
(4) and (4) repeating the steps (1) to (3) until the adjustment is finished.
In some embodiments, the control signal for increasing the temperature of the steam exhaust area of the rear cylinder of the steam turbine is to decrease the opening of the regulating valve, stop the vacuum pump set or decrease the frequency of the vacuum pump set, and increase the opening of the vacuum breaking valve.
In some embodiments, the control signal for reducing the temperature of the steam exhaust area of the rear cylinder of the steam turbine is to increase the opening of the regulating valve, open the vacuum pump set or increase the frequency of the vacuum pump set, and decrease the opening of the vacuum breaking valve.
Compared with the prior art, the invention has the beneficial effects that:
on the premise of ensuring the small volume flow operation blast cooling effect, the invention comprehensively utilizes the adjustment means of the water spray flow of the rear cylinder of the steam turbine and the back pressure of the unit according to the vibration increase condition of the bearing bush, improves the temperature of the steam exhaust area of the rear cylinder of the steam turbine, reduces the thermal expansion deviation between the cylinder shell of the cylinder bearing unit and the rotor bearing, and realizes the purpose of controlling the vibration of the bearing bush within the safe operation threshold;
the invention effectively avoids the risk that the steam turbine safety operation is endangered due to the fact that the blast temperature of the steam turbine exceeds the standard because the vibration of the bearing bush cannot be effectively controlled or the adjustment is excessive because the working condition operation parameters are randomly adjusted by depending on personal experience of steam turbine operators at present.
Drawings
The foregoing and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic structural diagram of an automatic adjustment system for vibration of a bearing shell of a low volume flow lower cylinder bearing according to the present invention;
FIG. 2 is a flow chart of the method for automatically adjusting the vibration of a bearing shell of a low volume flow lower cylinder bearing according to the present invention;
description of reference numerals:
the device comprises a steam turbine cylinder body 1, a condenser 2, a bearing bush 3, a bearing bush vibration tester 4, a cylinder bearing pedestal 5, a regulating valve 6, a water spray flow tester 7, a temperature tester 8, a water spray nozzle 9, a vacuum pump set 10, a vacuum breaker valve 11 and a vacuum pressure tester 12.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
The following describes a system and a method for automatically adjusting the vibration of a bearing shell of a low-volume-flow lower-lying cylinder bearing, which are provided by the embodiment of the invention, with reference to the attached drawings.
As shown in fig. 1, the automatic bearing bush vibration adjusting system for a small-volume-flow lower-seat cylinder bearing of the present invention includes a steam turbine cylinder body 1, a seat cylinder bearing seat 5, a bearing bush vibration tester 4, a temperature control system, a vacuum control system and a controller.
In some embodiments, the bearing shell vibration tester 4, the temperature control system, and the vacuum control system are all electrically connected to a controller, and the bearing shell vibration tester 4 transmits the measured vibration values of the bearing shells 3 to the controller.
In some embodiments, when the vibration value of the bearing shell 3 exceeds a safety threshold, the automatic adjustment system is activated and the controller adjusts the temperature control system and the vacuum control system according to a deviation of the vibration value of the bearing shell 3 from exceeding the safety threshold.
In some embodiments, the controller is a DCS central control system.
In some embodiments, a condenser 2 is disposed below the turbine cylinder 1, and the condenser 2 and the turbine cylinder 1 are hermetically connected.
In some embodiments, the turbine cylinder block 1 is connected to the turbine cylinder block 1 by bearing shells 3.
In some embodiments, the bearing shell vibration tester 4 is configured to test a vibration value of the bearing shell 3, and it is understood that the bearing shell vibration tester 4 transmits the tested vibration value of the bearing shell 3 to the controller, and the controller performs corresponding control adjustment by determining the vibration value of the bearing shell 3 and a safety threshold for vibration of the bearing shell 3. The turbine cylinder body 1, the condenser 2, the bearing bush 3, the bearing bush vibration tester 4 and the cylinder bearing pedestal 5 form a turbine bearing and a corresponding supporting mechanism thereof.
In some embodiments, the temperature control system comprises a sprinkler head 9, a regulating valve 6, a sprinkler flow tester 7, and a temperature tester 8.
Specifically, the water spray nozzles 9 are arranged at the rear cylinder position of the steam turbine cylinder block 1, and a plurality of water spray nozzles 9 are provided, so that it can be understood that the number of the water spray nozzles 9 is set according to actual conditions.
The regulating valve 6 is arranged on the water flow main pipeline and used for regulating the water spraying flow, and it can be understood that the water spraying flow is regulated by regulating the valve opening degree of the regulating valve 6, the regulating valve 6 is electrically connected with the controller, and the controller regulates and controls the opening degree of the regulating valve 6.
The water spraying flow tester 7 is arranged at the downstream of the regulating valve 6 and used for testing the water spraying flow, the water spraying flow tester 7 is electrically connected with the controller, and the water spraying flow tester 7 transmits the water spraying flow data obtained by testing to the controller.
The temperature tester 8 sets up in steam turbine rear cylinder steam extraction district position, and the temperature tester 8 is a plurality of, and it can be understood that, sets for the quantity of temperature tester 8 according to actual conditions, and the temperature tester 8 is connected with the controller electricity, and the temperature data transmission that the temperature tester 8 will test and obtain to the controller.
In addition, although not shown, it is understood that the temperature control system further includes a water source disposed upstream of the regulator valve 6, which provides cooling water to the temperature control system.
In some embodiments, the vacuum control system includes a vacuum pressure tester 12, a vacuum pump set 10, and a vacuum break valve 11.
Specifically, the vacuum pump unit 10 is connected with the condenser 2 through a pipeline and used for vacuumizing the condenser 2, the vacuum pump unit 10 is electrically connected with the controller, and the controller adjusts and controls the frequency and the opening and closing of the vacuum pump unit 10.
The vacuum pressure tester 12 is arranged on a pipeline between the vacuum pump unit 10 and the condenser 2 and used for testing the vacuum value of the condenser 2, the vacuum pressure tester 12 is electrically connected with the controller, and the vacuum pressure tester 12 transmits test data to the controller.
The vacuum breaker valve 11 is arranged on a branch between the vacuum pressure tester 12 and the vacuum pump unit 10, the vacuum pump unit 10 and the vacuum breaker valve 11 are both electrically connected with a controller, and the controller regulates and controls the opening of the vacuum breaker valve 11. The vacuum pump set 10 and the vacuum breaker valve 11 work cooperatively, specifically, when the vacuum pump set 10 is stopped or the frequency of the vacuum pump set 10 is reduced, the opening degree of the vacuum breaker valve 11 is increased; when the vacuum pump unit 10 is turned on or the frequency of the vacuum pump unit 10 is increased, the opening degree of the vacuum break valve 11 is reduced.
As shown in fig. 2, the method for automatically adjusting the vibration of the bearing bush of the low volume flow lower cylinder bearing comprises the following steps:
(1) obtaining the vibration value of the bearing bush 3;
(2) judging whether the vibration value of the bearing bush 3 exceeds a safety threshold value, and if the vibration value of the bearing bush 3 does not exceed the safety threshold value, finishing the adjustment; if the vibration value of the bearing bush 3 exceeds the safety threshold, calculating the deviation between the vibration value of the bearing bush 3 and the safety threshold;
(3) the controller sends out a control signal for increasing the temperature of the steam exhaust area of the rear cylinder of the steam turbine according to the deviation;
(4) judging whether the temperature of the steam exhaust area of the rear cylinder of the steam turbine exceeds the air blast temperature limit value or not, and finishing the adjustment if the temperature of the steam exhaust area of the rear cylinder of the steam turbine does not exceed the air blast temperature limit value; if the temperature of the steam exhaust area of the rear cylinder of the steam turbine exceeds the air blast temperature limit value, the controller sends out a control signal for reducing the temperature of the steam exhaust area of the rear cylinder of the steam turbine;
(5) and (5) repeating the steps (2) to (4) until the adjustment is finished.
In the step (1), the obtained vibration value of the bearing bush 3 is real-time data tested by the bearing bush vibration tester 4 obtained from the controller.
In the step (2), whether the vibration value of the bearing bush 3 exceeds a safety threshold is judged, and specifically, the controller judges whether the vibration value of the bearing bush 3 exceeds the safety threshold according to the acquired real-time data tested by the bearing bush vibration tester 4. If the temperature of the steam exhaust area of the rear cylinder of the steam turbine does not exceed the air blast temperature limit value, the adjustment is finished. The vibration value of the bearing bush 3 exceeds a safety threshold, specifically, when the vibration value of the bearing bush 3 exceeds the safety threshold, the steam turbine has a potential safety hazard, and at this time, adjustment is needed. And calculating the deviation of the vibration value of the bearing bush 3 and the safety threshold, specifically, calculating the deviation of the vibration value of the bearing bush 3 and the safety threshold by the controller according to the real-time data and the safety threshold tested by the bearing bush vibration tester 4, and further performing corresponding adjustment according to the deviation.
And (3) sending a control signal for increasing the temperature of the steam exhaust area of the rear cylinder of the steam turbine by the controller according to the deviation, wherein the control signal for increasing the temperature of the steam exhaust area of the rear cylinder of the steam turbine is to reduce the opening of the regulating valve 6, stop the vacuum pump set 10 or reduce the frequency of the vacuum pump set 10, increase the opening of the vacuum breaker valve 11, and increase the temperature of the steam exhaust area of the rear cylinder of the steam turbine together through the regulation. Wherein, the opening of the regulating valve 6 is reduced so as to reduce the flow value measured by the water spraying flow tester 7. Stopping the vacuum pump set 10 or reducing the frequency of the vacuum pump set 10, thereby reducing the vacuumizing output of the vacuum pump set 10; the opening degree of the vacuum breaker valve 11 is increased, so that the vacuum breaking amount is increased, and finally the back pressure of the turbine cylinder 1 and the condenser 2 is increased.
In the step (4), judging whether the temperature of the steam exhaust area of the rear cylinder of the steam turbine exceeds the air blast temperature limit value, specifically, after the operation of increasing the temperature of the steam exhaust area of the rear cylinder of the steam turbine in the step (3), judging the sizes of the temperature of the steam exhaust area of the rear cylinder of the steam turbine and the air blast temperature limit value; if the temperature of the steam exhaust area of the rear cylinder of the steam turbine does not exceed the air blast temperature limit value, the steam turbine is safely operated at the moment, and the adjustment is finished; if the temperature of the steam exhaust area of the rear cylinder of the steam turbine exceeds the blowing temperature limit value, the steam turbine has potential safety hazards at the moment, and the controller sends out a control signal for reducing the temperature of the steam exhaust area of the rear cylinder of the steam turbine. The control signal for reducing the temperature of the steam exhaust area of the rear cylinder of the steam turbine is to increase the opening of the regulating valve 6, open the vacuum pump set 10 or improve the frequency of the vacuum pump set 10, and reduce the opening of the vacuum breaker valve 11, so that the temperature of the steam exhaust area of the rear cylinder of the steam turbine is reduced through the adjustment.
In one embodiment, a method for automatically adjusting the vibration of a bearing bush of a small-volume-flow lower-cylinder bearing is specifically described by taking a DSC (differential scanning) centralized control system as an example, and includes the following steps:
s1: when the unit operates under the condition of small volume flow, the DCS centralized control system monitors that the vibration value of the real-time bearing bush 3 exceeds the safe operation threshold value by 80 microns, at the moment, the vibration value reaches 90 microns, and the exceeding proportion reaches 12.5 percent.
S2: after the bearing bush vibration adjusting system monitors that the deviation delta between the vibration value of the bearing bush 3 and the safe operation threshold value is 12.5%, the adjusting valve 6 is adjusted to be small, so that the adjusting valve 6 is relatively adjusted to be 18% from the current opening degree of 24% to reduce the water spraying flow value.
S3: because only one vacuum pump set 10 runs at a low speed at present, and the operation of stopping the pump and reducing the frequency can not be carried out any more, the opening degree of the vacuum breaker valve 11 is increased according to the deviation delta between the vibration value of the bearing bush 3 and the safe running threshold value as 12.5%, so that the vacuum breaker valve 11 is relatively increased to 20% from the current 10% to increase the back pressure of the condenser 2.
S4: and (3) monitoring whether the temperature of the steam exhaust area of the rear cylinder of the steam turbine exceeds the limit value of the blast temperature under the working condition of small volume flow or not at all time while the water spray flow is adjusted to be small and the back pressure of the condenser 2 is adjusted to be large. If the adjusted temperature of the steam exhaust area of the rear cylinder of the steam turbine exceeds the blowing temperature limit value, the opening degree of the adjusting valve 6 is reduced and adjusted from 18% to 21%, meanwhile, the opening degree of the vacuum breaker valve 11 is reduced and adjusted from 20% to 15%, whether the vibration value of the bearing bush 3 exceeds the safety threshold value or not is judged, if the vibration value of the bearing bush 3 does not exceed the safety threshold value, the adjustment is finished, if the vibration value of the bearing bush 3 exceeds the safety threshold value, the adjustment is continued according to the deviation of the vibration value of the bearing bush 3 and the safety threshold value until the real-time vibration value of the bearing bush 3 falls within 80 microns of the safety operation threshold value, and the operation of the adjustment system of the steam turbine is finished.
S5: and if the temperature of the steam exhaust area of the rear cylinder of the steam turbine does not exceed the upper limit value of the blast temperature under the working condition of small volume flow after adjustment, ending the action of the adjustment system of the steam turbine.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms may be directed to different embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. The utility model provides a sit axle bush vibration automatic regulating system of jar bearing under little volume flow which characterized in that includes:
the steam turbine comprises a steam turbine cylinder body, wherein a condenser is arranged below the steam turbine cylinder body;
the cylinder bearing block is arranged, and the steam turbine cylinder body is connected with the steam turbine cylinder body through a bearing bush;
the bearing bush vibration tester is used for testing the vibration value of the bearing bush;
the temperature control system is used for adjusting the temperature of a steam exhaust area of a rear cylinder of the steam turbine;
the vacuum control system is used for adjusting the vacuum degree of the condenser;
the bearing bush vibration tester, the temperature control system and the vacuum control system are all electrically connected with the controller, and the bearing bush vibration tester transmits the measured vibration value of the bearing bush to the controller.
2. The system of claim 1, wherein an automatic adjustment system is activated when the vibration level of the bearing shell exceeds a safety threshold, and wherein the controller adjusts the temperature control system and the vacuum control system based on a deviation of the vibration level of the bearing shell from exceeding the safety threshold.
3. The system of claim 1, wherein the temperature control system comprises:
the water spray nozzles are arranged at the position of a rear cylinder of the steam turbine cylinder body;
the regulating valve is used for regulating the water spraying flow;
the water spraying flow tester is used for testing the water spraying flow and is arranged at the downstream of the regulating valve;
the temperature tester is used for testing the temperature of the steam exhaust area of the rear cylinder of the steam turbine and is arranged in the steam exhaust area of the cylinder body of the steam turbine.
4. The system of claim 3, wherein the temperature tester, the regulator valve, and the water jet flow tester are electrically connected to the controller, the controller regulates the opening of the regulator valve, the water jet flow tester transmits test data to the controller, and the temperature tester transmits temperature test data to the controller.
5. The system of claim 1, wherein the vacuum controller comprises:
the vacuum pressure tester is used for testing the vacuum value of the condenser;
the vacuum pump set is used for vacuumizing the condenser and is connected with the condenser through a pipeline, and the vacuum pressure tester is arranged on the pipeline between the vacuum pump set and the condenser;
a vacuum break valve disposed on a branch between the vacuum pressure tester and the vacuum pump set.
6. The system of claim 5, wherein the vacuum pressure tester, the vacuum pump set, and the vacuum breaker valve are electrically connected to the controller, the controller regulates the frequency and opening and closing of the vacuum pump set, the controller regulates the opening of the vacuum breaker valve, and the vacuum pressure tester transmits test data to the controller.
7. The system of claim 5, wherein the vacuum pump set and the vacuum breaker valve cooperate to increase the vacuum breaker valve opening when the vacuum pump set is stopped or the frequency of the vacuum pump set is decreased; when the vacuum pump set is started or the frequency of the vacuum pump set is increased, the opening degree of the vacuum breaking valve is reduced.
8. A method for automatically adjusting the vibration of a bearing shell of a low volume flow squat cylinder bearing, adapted for use in a system according to any of claims 1 to 7, comprising the steps of:
(1) judging whether the vibration value of the bearing bush exceeds a safety threshold value, and if the vibration value of the bearing bush does not exceed the safety threshold value, finishing the adjustment; if the vibration value of the bearing bush exceeds the safety threshold, calculating the deviation of the vibration value of the bearing bush and the safety threshold;
(2) the controller sends a control signal for increasing the temperature of the steam exhaust area of the rear cylinder of the steam turbine according to the deviation;
(3) judging whether the temperature of the steam exhaust area of the rear cylinder of the steam turbine exceeds an air blast temperature limit value or not, and finishing the adjustment if the temperature of the steam exhaust area of the rear cylinder of the steam turbine does not exceed the air blast temperature limit value; if the temperature of the steam exhaust area of the rear cylinder of the steam turbine exceeds the air blast temperature limit value, a controller sends out a control signal for reducing the temperature of the steam exhaust area of the rear cylinder of the steam turbine;
(4) and (4) repeating the steps (1) to (3) until the adjustment is finished.
9. The method according to claim 8, wherein the control signal for increasing the temperature of the steam exhaust area of the rear cylinder of the steam turbine is to decrease the opening of the regulating valve, stop the vacuum pump set or decrease the frequency of the vacuum pump set, and increase the opening of the vacuum breaker valve.
10. The method according to claim 8, wherein the control signal for lowering the temperature of the steam exhaust area of the rear cylinder of the steam turbine is to increase the opening of the regulating valve, to open the vacuum pump set or to increase the frequency of the vacuum pump set, and to decrease the opening of the vacuum breaker valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210622986.0A CN114876592B (en) | 2022-06-02 | 2022-06-02 | Automatic bearing bush vibration adjusting system and method for cylinder bearing under small volume flow |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210622986.0A CN114876592B (en) | 2022-06-02 | 2022-06-02 | Automatic bearing bush vibration adjusting system and method for cylinder bearing under small volume flow |
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| CN114876592A true CN114876592A (en) | 2022-08-09 |
| CN114876592B CN114876592B (en) | 2023-10-17 |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20160090861A1 (en) * | 2014-09-26 | 2016-03-31 | Kabushiki Kaisha Toshiba | Steam turbine |
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| CN114876592B (en) | 2023-10-17 |
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