CN113279823A - Secondary liquid drop control system for last-stage blade of steam turbine - Google Patents
Secondary liquid drop control system for last-stage blade of steam turbine Download PDFInfo
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- CN113279823A CN113279823A CN202110561044.1A CN202110561044A CN113279823A CN 113279823 A CN113279823 A CN 113279823A CN 202110561044 A CN202110561044 A CN 202110561044A CN 113279823 A CN113279823 A CN 113279823A
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- control valve
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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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- 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
- 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
Abstract
The invention relates to a secondary liquid drop control system for a last-stage blade of a steam turbine, which comprises: the device comprises a final-stage liquid drop parameter detection device, a controller, a final-stage atomization water spraying device and a water spraying control valve arranged on a water inlet pipeline of the final-stage atomization water spraying device; the final-stage atomization water spraying device is arranged on the low-pressure cylinder and is used for spraying water to the low-pressure cylinder; the final-stage liquid drop parameter detection device is arranged on the low-pressure cylinder and is used for detecting the state parameters of the final-stage steam of the low-pressure cylinder; and the controller is respectively connected with the final-stage liquid drop parameter detection device and the water spray control valve and is used for controlling the opening of the water spray control valve according to the state parameters so as to adjust the water spray flow of the final-stage atomization water spray device. The invention realizes the accurate control of the water spray flow, thereby reducing the over spray, reducing the final stage water spray amount, achieving the aim of optimally controlling the secondary liquid drop of the final stage blade, avoiding the advanced water erosion of the final blade and prolonging the service life of the final blade.
Description
Technical Field
The invention relates to the technical field of thermal power generation, in particular to a secondary liquid drop control system for a last-stage blade of a steam turbine.
Background
With the high-speed development of new energy installation, the function positioning of the thermal power generating unit is fundamentally changed, and the trend of supporting the bottom, protecting the supply and giving way is inevitable. For large-scale steam turbine units, the overall operation life in China is relatively short, most capital construction designs are of the nature of basic load or shallow peak regulation, and most of the steam turbines of the unit have potential safety hazard pressure of peak regulation for the situation requirement of deep peak regulation. For a steam turbine with flexible deep peak regulation requirements, particularly for a northern heat supply unit, water erosion is easy to occur on the last-stage blade under the condition of small cooling flow, and the water erosion harm caused by secondary water drops is mainly used, so that great hidden danger is brought to the operation safety of a main machine
Disclosure of Invention
In order to solve the technical problem or at least partially solve the technical problem, the invention provides a secondary liquid drop control system for a last stage blade of a steam turbine.
The invention provides a secondary liquid drop control system for a last-stage blade of a steam turbine, which comprises: last-stage liquid drop parameter detection device, controller, last-stage atomizing and water spraying device and set up and be in spout water control valve on last-stage atomizing and water spraying device's the inlet channel, wherein:
the final-stage atomization water spraying device is arranged on the low-pressure cylinder and is used for spraying water to the low-pressure cylinder;
the final-stage liquid drop parameter detection device is arranged on the low-pressure cylinder and used for detecting the state parameter of the final-stage steam of the low-pressure cylinder;
and the controller is respectively connected with the final-stage liquid drop parameter detection device and the water spray control valve and is used for controlling the opening of the water spray control valve according to the state parameters so as to adjust the water spray flow of the final-stage atomization water spray device.
According to the secondary liquid drop control system for the last-stage blade of the steam turbine, the last-stage liquid drop parameter detection device is used for collecting state parameters of last-stage steam, and the controller is used for adjusting the water spraying control valve according to the state parameters, so that the water spraying flow of the last-stage atomizing water spraying device is controlled, namely the accurate control of the water spraying flow is realized, the over spraying is reduced, the last-stage water spraying amount is reduced, the aim of optimally controlling the secondary liquid drops of the last-stage blade is achieved, the advanced water erosion of the last blade is avoided, and the service life of the last blade is prolonged.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
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, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
FIG. 1 is a schematic diagram of the connection between a secondary liquid droplet control system and a high-low pressure cylinder of a last stage blade of a steam turbine provided by the invention.
Reference numerals: 1-a low pressure cylinder; 2-a controller; 3-final stage atomization water spraying device; 4-a first water spray control valve; 5-a second water spray control valve; 6-steam admission parameter detection device; 7-final droplet parameter detection means; and 8-unit distributed control device.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
The invention provides a secondary liquid drop control system for a last-stage blade of a steam turbine, which is a system for controlling secondary liquid drops of the last-stage blade under a flexible peak regulation type steam turbine scene. As shown in fig. 1, the system includes: last-stage liquid drop parameter detection device 7, controller 2, last-stage atomizing and water-spraying device 3 and set up the water spray control valve on the inlet channel of last-stage atomizing and water-spraying device 3, wherein:
the final-stage atomization water spraying device 3 is arranged on the low-pressure cylinder 1 and is used for spraying water to the low-pressure cylinder 1;
the final-stage liquid drop parameter detection device 7 is arranged on the low-pressure cylinder 1 and is used for detecting the state parameter of the final-stage steam of the low-pressure cylinder 1;
and the controller 2 is respectively connected with the final-stage droplet parameter detection device 7 and the water spray control valve, and is used for controlling the opening of the water spray control valve according to the state parameters so as to adjust the water spray flow of the final-stage atomization water spray device 3.
Wherein, the final droplet parameter detecting device 7 may be specifically arranged on the cylinder of the low pressure cylinder 1, and is used for detecting a state parameter of the final steam, and the state parameter may include a plurality of, and therefore, the final droplet parameter detecting device 7 may include a plurality of sensors capable of detecting different state parameters.
Wherein, the last leaf is the last stage leaf.
The state parameters may specifically include temperature, pressure, humidity and/or droplet particle size of the last leaf vapor, among others. Of course, other parameters are possible.
Wherein, the final stage atomizing water spraying device 3 is used for spraying water to the low pressure cylinder 1. The final-stage atomizing water spraying device 3 can be specifically arranged on the cylinder guide ring of the low-pressure cylinder 1, namely, the cylinder guide ring of the low-pressure cylinder 1 is sprayed with water so as to cool the cylinder of the low-pressure cylinder 1.
Wherein, the water spray control valve is arranged on the water inlet pipeline of the final-stage atomization water spraying device 3, and the water spray flow of the final-stage atomization water spraying device 3 can be adjusted by adjusting the opening degree of the water spray control valve. The opening of the regulating valve is increased, and the water spraying flow of the final-stage atomizing and water spraying device 3 is increased; the opening of the regulating valve is reduced, and the water spraying flow of the final-stage atomizing and water spraying device 3 is reduced.
The controller 2 can also be called a final-stage droplet controller 2, and the controller 2 is connected with the regulating valve and the final-stage droplet parameter detection device 7, so that the controller 2 can acquire the state parameters of the final-stage droplet parameter detection device 7 in real time, and then control the opening degree of the water spray control valve according to the state parameters, thereby realizing the control of the water spray flow of the final-stage atomizing water spray device 3.
The controller 2 can be connected with the water spraying control valve through a signal cable, and the controller 2 can be connected with the final-stage droplet parameter detection device 7 through a signal cable.
It can be understood that the last-stage droplet parameter detection device 7 is adopted to collect the state parameters of the last-stage steam, and the controller 2 is adopted to adjust the water spraying control valve according to the state parameters, so that the water spraying flow of the last-stage atomizing and water spraying device 3 is controlled, namely, the accurate control of the water spraying flow is realized, the over-spraying is reduced, the last-stage water spraying amount is reduced, the target of optimally controlling the secondary droplets of the last-stage blades is achieved, the early water erosion of the last-stage blades is avoided, and the service life of the last-stage blades is prolonged.
In practice, the method can effectively reduce the final stage water spraying amount of unnecessary over spraying by about 5%, prolong the water erosion service life of the final stage blade by 50%, and realize economic operation of the unit.
In particular implementation, the controller 2 may be specifically configured to: and when the humidity of the last leaf steam is more than or equal to the preset safe humidity or the granularity of the liquid drops is more than or equal to the preset safe granularity, controlling the opening of the water spraying control valve to be reduced until the humidity of the last leaf steam is less than the preset safe humidity and the granularity of the liquid drops is less than the preset safe granularity.
That is, when the humidity of the steam in the last leaf is too high or the particle size of the droplets is too large, which indicates that the water spraying amount is large, the controller 2 may adjust the opening degree of the water spraying control valve to be small, thereby reducing the water spraying amount. And monitoring the state parameters in real time, and when the humidity of the last leaf steam and the granularity of the liquid drops are reduced to be within a safety value, namely the humidity of the last leaf steam is less than the preset safety humidity, the granularity of the liquid drops is less than the preset safety granularity, and the opening degree of the water spraying control valve can not be adjusted to be small any more.
In particular implementation, the controller 2 may be specifically configured to: and when the temperature of the last leaf steam is higher than the preset temperature, controlling the opening of the water spraying control valve to be increased.
That is to say, when the temperature of the steam in the last leaf is too high, the controller 2 controls the opening of the water spray control valve to be increased, and the water spray flow is increased, so that the temperature of the steam in the last leaf is reduced, and the potential safety hazard caused by the too high temperature is reduced.
It can be understood that if the pressure of the steam in the last leaf is too high, the controller 2 can also control the opening degree of the water spraying control valve to be increased, increase the water spraying flow and reduce the pressure by reducing the temperature.
It can be seen that this application has practiced thrift the water resource through accurate control water spray flow, control and restrain the formation of the regional large granule secondary liquid drop of last leaf, guarantee the safe operation of last leaf. Therefore, the method and the device can ensure that the economic operation of the unit is realized on the premise that the last leaf is safe.
In a specific implementation, the water spray control valve may include: a first water spray control valve 4 and a second water spray control valve 5; the final-stage atomization water spraying device 3 comprises two groups of water spraying units, the first water spraying control valve 4 is arranged on a water inlet pipeline of one group of water spraying units, and the second water spraying control valve 5 is arranged on a water inlet pipeline of the other group of water spraying units.
That is, the first spray control valves 4 are used to control one group of spray units, and the second spray control valves 5 are used to control the other group of spray units.
Because two groups of water spraying units are arranged, the two groups of water spraying units can spray water independently, and the two groups of water spraying units spray water independently in different time periods, and can spray water jointly. At this time, the controller 2 may also be configured to control the staged individual opening or combined opening of the first and second water injection control valves 4 and 5 according to the state parameter.
For example, it can be determined that a larger amount of water is needed according to the state parameters, and at this time, the two water spray control valves can be jointly opened to spray water by the two groups of water spray units together. If the smaller water spraying amount can meet the requirement according to the state parameters, a water spraying control valve can be opened, and a group of water spraying units spray water.
In specific implementation, the control system provided by the present application may further include: the steam inlet parameter detection device 6 and the unit distributed control device 8 that all are connected with the controller 2, wherein:
the steam inlet parameter detection device 6 is arranged on a steam inlet pipeline of the low pressure cylinder 1 and is used for detecting the steam inlet parameter of the low pressure cylinder 1;
the controller 2 is configured to send the steam inlet parameter and the state parameter of the last blade steam to the unit distributed control device 8, so that the unit distributed control device 8 adjusts an operation parameter of the steam turbine according to the steam inlet parameter and the state parameter of the last blade steam.
The operating parameters of the steam turbine, such as the cold end back pressure and the steam inlet parameters of the steam turbine, are described.
The intake parameters include, for example, intake pressure, intake flow rate, and the like.
The controller 2 and the unit distributed control apparatus 8 may be connected by a signal cable.
The unit distributed control device 8, namely DCS, can control the whole steam turbine unit, where the unit distributed control device 8 is based on the intake parameters and the state parameters of the last blade steam during the control process.
For example, the unit distributed control device 8 regulates and controls the cold end back pressure of the steam turbine according to the state parameter of the final blade steam, so that the operation of the cold end back pressure of the unit is optimized; and adjusting the steam inlet parameters of the steam turbine according to the air inlet parameters of the low pressure cylinder 1 so as to optimize and adjust the proper unit backpressure and steam inlet parameters. Therefore, the monitoring method for preventing the water erosion of the last-stage blade is provided for the steam turbine, the optimal back pressure operation of the cold end of the unit can be jointly realized through the controller 2 and the unit distributed control device 8, and the effect of safety and energy conservation is realized.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal (such as a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (9)
1. A secondary droplet control system for a last stage blade of a steam turbine, comprising: last-stage liquid drop parameter detection device, controller, last-stage atomizing and water spraying device and set up and be in spout water control valve on last-stage atomizing and water spraying device's the inlet channel, wherein:
the final-stage atomization water spraying device is arranged on the low-pressure cylinder and is used for spraying water to the low-pressure cylinder;
the final-stage liquid drop parameter detection device is arranged on the low-pressure cylinder and used for detecting the state parameter of the final-stage steam of the low-pressure cylinder;
and the controller is respectively connected with the final-stage liquid drop parameter detection device and the water spray control valve and is used for controlling the opening of the water spray control valve according to the state parameters so as to adjust the water spray flow of the final-stage atomization water spray device.
2. The system of claim 1, wherein the state parameters of the last leaf vapor comprise temperature, pressure, humidity, and/or droplet particle size of the last leaf vapor.
3. The system of claim 2,
the controller is specifically configured to: and when the humidity of the last leaf steam is more than or equal to the preset safe humidity or the granularity of the liquid drops is more than or equal to the preset safe granularity, controlling the opening of the water spraying control valve to be reduced until the humidity of the last leaf steam is less than the preset safe humidity and the granularity of the liquid drops is less than the preset safe granularity.
4. The system of claim 2,
the controller is specifically configured to: and when the temperature of the last leaf steam is higher than the preset temperature, controlling the opening of the water spraying control valve to be increased.
5. The system of claim 1, wherein the spray control valve comprises: a first water spray control valve and a second water spray control valve; the last-stage atomization water spraying device comprises two groups of water spraying units, a first water spraying control valve is arranged on a water inlet pipeline of one group of water spraying units, and a second water spraying control valve is arranged on a water inlet pipeline of the other group of water spraying units.
6. The system of claim 5, wherein the controller is further configured to control the phased individual opening or the joint opening of the first and second spray control valves based on the state parameter.
7. The system of claim 1, further comprising: all with admission parameter detection device and unit distributed control device that the controller is connected, wherein:
the steam inlet parameter detection device is arranged on a steam inlet pipeline of the low pressure cylinder and is used for detecting the steam inlet parameters of the low pressure cylinder;
the controller is used for sending the steam inlet parameter and the state parameter of the last blade steam to the unit distributed control device, so that the unit distributed control device can adjust the operation parameter of the steam turbine according to the steam inlet parameter and the state parameter of the last blade steam.
8. The system of claim 1 wherein the final atomizing water spray device is disposed on a cylinder deflector ring of the low pressure cylinder.
9. The system of claim 1, wherein said final droplet parameter sensing device is disposed in a cylinder of said low pressure cylinder.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110561044.1A CN113279823B (en) | 2021-05-21 | 2021-05-21 | Secondary liquid drop control system for last-stage blade of steam turbine |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110561044.1A CN113279823B (en) | 2021-05-21 | 2021-05-21 | Secondary liquid drop control system for last-stage blade of steam turbine |
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| CN113279823A true CN113279823A (en) | 2021-08-20 |
| CN113279823B CN113279823B (en) | 2022-11-18 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53102403A (en) * | 1977-02-18 | 1978-09-06 | Hitachi Ltd | Temperature control for low pressure exhaust chamber of steam turbine |
| JPH09256806A (en) * | 1996-03-26 | 1997-09-30 | Fuji Electric Co Ltd | Cooling device of low pressure part of steam turbine |
| CN109899120A (en) * | 2019-04-24 | 2019-06-18 | 西安热工研究院有限公司 | A kind of steam turbine low-pressure is through-flow area's pre-warning system for monitoring and working method |
| CN110259527A (en) * | 2019-07-24 | 2019-09-20 | 哈尔滨汽轮机厂有限责任公司 | A kind of power output of super-pressure 200MW low pressure (LP) cylinder zero flexibility transformation steam turbine |
-
2021
- 2021-05-21 CN CN202110561044.1A patent/CN113279823B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53102403A (en) * | 1977-02-18 | 1978-09-06 | Hitachi Ltd | Temperature control for low pressure exhaust chamber of steam turbine |
| JPH09256806A (en) * | 1996-03-26 | 1997-09-30 | Fuji Electric Co Ltd | Cooling device of low pressure part of steam turbine |
| CN109899120A (en) * | 2019-04-24 | 2019-06-18 | 西安热工研究院有限公司 | A kind of steam turbine low-pressure is through-flow area's pre-warning system for monitoring and working method |
| CN110259527A (en) * | 2019-07-24 | 2019-09-20 | 哈尔滨汽轮机厂有限责任公司 | A kind of power output of super-pressure 200MW low pressure (LP) cylinder zero flexibility transformation steam turbine |
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| CN113279823B (en) | 2022-11-18 |
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