CN116067560A - Method and device for reducing pressure fluctuation of main steam valve closing test of steam turbine - Google Patents
Method and device for reducing pressure fluctuation of main steam valve closing test of steam turbine Download PDFInfo
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- CN116067560A CN116067560A CN202310196978.9A CN202310196978A CN116067560A CN 116067560 A CN116067560 A CN 116067560A CN 202310196978 A CN202310196978 A CN 202310196978A CN 116067560 A CN116067560 A CN 116067560A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
- G01L19/0092—Pressure sensor associated with other sensors, e.g. for measuring acceleration or temperature
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- G—PHYSICS
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
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Abstract
The embodiment of the invention provides a method and a device for reducing pressure fluctuation of a main steam valve closing test of a steam turbine, and belongs to the field of main steam valve testing of the steam turbine. The method comprises the following steps: acquiring the main steam pressure of the steam valve in the closing test process; calculating a pressure change difference value between the main steam pressure and a preset pressure, wherein the preset pressure is the main steam pressure of a steam valve in a stable load state of the steam turbine; and adjusting the experimental action in the closing test process according to the pressure change difference value so as to enable the main steam pressure to approach the preset pressure. The invention can effectively reduce the pressure fluctuation of the main steam, can control the pressure fluctuation of the main steam in a relatively small range, can ensure the safe operation of the unit, and has stronger reference significance for the safe operation of the unit after the domestic transformation of the same type of unit.
Description
Technical Field
The invention relates to the field of testing of main steam valves of steam turbines, in particular to a method for reducing pressure fluctuation of a main steam valve closing test of a steam turbine, a device for reducing pressure fluctuation of the main steam valve closing test of the steam turbine, electronic equipment and a computer readable storage medium.
Background
When the unit is in normal operation, the high-pressure and medium-pressure main steam valves and the regulating valves of the steam turbine are always in an open state, so that the problems that the steam valves cannot act due to salt accumulation, oxide skin generation and the like of the steam valves and the problems that the regulating security system is in a state that the steam valves cannot act due to the oil motor or the fast-closing electromagnetic valve is out of order are solved, and therefore overspeed accidents of the steam turbine occur when the unit is in load shedding and is in shutdown, and therefore loosening and closing tests on the steam valves are required to be carried out regularly. According to the operation rules and operation ticket regulations, the loosening and closing tests of the steam valve are carried out one by one within the specified load range so as to ensure the normal action of the steam valve.
After the steam turbine unit is modified by the DCS operation system, the main steam pressure can be continuously increased aiming at the modified steam turbine unit by the current shutdown test, and the main steam pressure can be continuously increased to cause the unit superheat degree and the regulating stage temperature to be reduced, so that the possibility of water carrying of steam is increased, and the safe operation of the unit is seriously threatened.
Disclosure of Invention
The embodiment of the invention aims to provide a method and a device for reducing pressure fluctuation of a main steam valve closing test of a steam turbine, and solves the problem that the main steam pressure continues to rise for a reformed steam turbine unit in the current closing test.
In order to achieve the above object, the present invention provides a method of reducing pressure fluctuations in a steam valve closing test of a steam turbine, the method comprising:
acquiring the main steam pressure of the steam valve in the closing test process;
calculating a pressure change difference value between the main steam pressure and a preset pressure, wherein the preset pressure is the main steam pressure of a steam valve in a stable load state of the steam turbine;
and adjusting the experimental action in the closing test process according to the pressure change difference value so as to enable the main steam pressure to approach the preset pressure.
Preferably, the experimental actions include: at least one of the opening and closing rate of the steam valve, the experimental interval duration and the boiler combustion amount.
Preferably, the adjusting of the experimental actions during the closing test according to the pressure variation difference comprises:
calculating the variation amplitude of the main steam pressure according to the pressure variation difference value;
determining a magnitude of decrease in the valve opening and closing rate that matches a magnitude of change in the main steam pressure;
and reducing the opening and closing speed of the steam valve according to the reducing amplitude of the opening and closing speed of the steam valve.
Preferably, the adjusting of the experimental actions during the closing test according to the pressure variation difference comprises:
calculating the rising rate of the main steam pressure according to the pressure change difference value;
and if the rising rate of the main steam pressure exceeds a rising rate threshold value, reducing the combustion amount of the boiler.
Preferably, if the rising rate of the main steam pressure does not exceed the rising rate threshold, the switching rate of the steam valve is reduced so that the main steam pressure approaches the preset pressure.
Preferably, the adjusting of the experimental actions during the closing test according to the pressure variation difference comprises:
setting the experimental interval time of two steam valves for continuously closing experiments;
judging whether the pressure change difference value at the moment is reduced to be within a pressure stabilizing interval or not at the moment when the previous steam valve closing experiment is finished and the experiment interval duration is reached;
if the pressure change difference value at the moment is reduced to be within the pressure stabilizing interval, starting a closing experiment of a later steam valve;
if the pressure change difference value at the moment is not reduced to the pressure stabilizing interval, the experimental interval duration is increased until the pressure change difference value is reduced to the pressure stabilizing interval, and the closing experiment of the next steam valve is started.
Preferably, the method further comprises:
calculating the rising rate of the main steam pressure according to the pressure change difference value;
if the rising rate of the main steam pressure is far more than the rising rate threshold value, reducing the boiler combustion amount and the switching rate of the steam valve;
if the rising rate of the main steam pressure does not exceed the rising rate threshold value, the switching rate of the steam valve is reduced.
Preferably, the steam valve comprises a high-pressure main steam valve, a high-pressure regulating valve and a medium-pressure combined valve.
The invention also provides a device for reducing the fluctuation of the closing test pressure of the steam valve of the steam turbine, which is used for realizing the method for reducing the fluctuation of the closing test pressure of the steam valve of the steam turbine, and comprises the following steps:
the acquisition module is used for acquiring the main steam pressure of the steam turbine steam valve in the closing test process;
the calculation module is used for calculating a pressure change difference value between the main steam pressure and a preset pressure, wherein the preset pressure is the main steam pressure of a steam turbine steam valve in a stable load state of the steam turbine;
and the adjusting module is used for adjusting the experimental action in the closing test process according to the pressure change difference value so as to enable the main steam pressure to approach the preset pressure.
The invention also provides an electronic device, which comprises a memory, a processor and a computer program stored in the memory and capable of running on the processor, wherein the method for reducing the pressure fluctuation of the steam valve closing test of the steam turbine is realized when the processor executes the computer program.
The invention also provides a computer readable storage medium having stored thereon a computer program, characterized in that the program when executed by a processor implements the above method of reducing pressure fluctuations in a steam turbine valve closing test.
Through the technical scheme, the invention has at least the following technical effects:
the invention can effectively reduce the pressure fluctuation of the main steam, can control the pressure fluctuation of the main steam in a relatively smaller safety range, can ensure the safe operation of the unit, and has stronger reference significance for the safe operation of the unit after the domestic transformation of the same type of unit.
Additional features and advantages of embodiments of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings are included to provide a further understanding of embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain, without limitation, the embodiments of the invention. In the drawings:
FIG. 1 is a flow chart of a method for reducing pressure fluctuations in a steam turbine valve closing test according to one embodiment of the present invention;
FIG. 2 is a block diagram of a method for reducing pressure fluctuations in a turbine valve closing test according to an alternative embodiment of the present invention.
Detailed Description
The following describes the detailed implementation of the embodiments of the present invention with reference to the drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the invention, are not intended to limit the invention.
FIG. 1 is a flow chart of a method for reducing turbine valve closing test pressure fluctuations according to an embodiment of the present invention, as shown in FIG. 1, a method for reducing turbine valve closing test pressure fluctuations, the method comprising:
step S101: acquiring the main steam pressure of the steam valve in the closing test process;
in the embodiment, the steam turbine is provided with 2 high-pressure main steam valves, 4 high-pressure regulating valves and 2 medium-pressure combined valves, the valve sequence of the high-pressure regulating valves is se:Sub>A compound steam distribution mode, and the opening sequence of four high-pressure regulating valves (valve A, valve B, valve C and valve D) is D-BC-A; in general, when the high-pressure regulating valve is closed for experiments, the high-pressure regulating valve is gradually closed to 10% at a reference rate of 2%/s, then the electromagnetic valve is quickly closed, the high-pressure regulating valve is quickly closed after the safety oil pressure is released, and the high-pressure regulating valve is automatically opened to a valve position before the start of the experiments at a reference rate of 2%/s after the feedback of total closing of the high-pressure regulating valve is received; the main steam pressure is thus collected during the experiment by means of a steam pressure monitoring device.
Step S102: calculating a pressure change difference value between the main steam pressure and a preset pressure, wherein the preset pressure is the main steam pressure of a steam valve in a stable load state of the steam turbine;
in the embodiment, when the full-stroke closing test of the main steam valve is carried out, the stable load of the unit is 400MW, the main steam pressure is 19.51MPa, and the supercritical pressure of the main steam pressure is 23.18MPa; therefore, 19.51MPa is taken as the preset pressure of the stable load of the steam turbine.
Step S103: and adjusting the experimental action in the closing test according to the pressure change difference value so as to enable the main steam pressure to approach the preset pressure.
As a further optimization of this embodiment, the experimental actions include: at least one of the switching speed of the steam valve, the experimental interval duration and the boiler combustion amount, namely, the invention can flexibly select different adjusting modes according to the actual valve closing experimental working condition; for example, the main steam pressure can be adjusted in one mode, or can be adjusted in a combination of two modes or three modes simultaneously.
Specifically, when the opening and closing speed of the steam valve in the closing experiment is adjusted, the experimental actions in the closing experiment process are adjusted according to the pressure change difference value, and the method comprises the following steps:
step a101: calculating the variation amplitude of the main steam pressure according to the pressure variation difference value;
step a102: determining a magnitude of decrease in the valve opening and closing rate that matches a magnitude of change in the main steam pressure;
in this embodiment, the decreasing amplitude of each valve opening and closing rate corresponds to a range of varying amplitude, and it is determined in which range of varying amplitude the calculated varying amplitude falls, and then the decreasing amplitude of the corresponding valve opening and closing rate is selected; for example, it can be divided into six ranges of variation ranges, 5% -7.5%,7.5% -10%,10% -12.5%,12.5% -15%,15% -17.5% and 17.5% -19%, respectively.
Step a103: and reducing the opening and closing speed of the steam valve according to the reducing amplitude of the opening and closing speed of the steam valve.
In this embodiment, for example, the collected main steam pressure is 22.46MPa, the variation range is 15.18%, the corresponding reduction range of the valve switching rate is 50%, and when the switching experiment is performed at the reference rate of 2%/s, the adjusted valve switching rate is 1%/s, and the reduction range of the valve switching rate corresponding to each variation range is obtained by fitting according to a plurality of tests.
Specifically, the method for adjusting the boiler combustion amount in the closing experiment comprises the following steps of:
step c101: calculating the rising rate of the main steam pressure according to the pressure change difference value;
step c102: and if the rising rate of the main steam pressure exceeds a rising rate threshold value, reducing the combustion amount of the boiler.
As a further optimization of this embodiment, if the rising rate of the main steam pressure does not exceed the rising rate threshold, the opening and closing rate of the steam valve is reduced, that is, the adjusting steps from step a01 to step a03 are adopted, so that the main steam pressure approaches the preset pressure.
Specifically, when the experimental interval duration in the closing experiment is adjusted, the experimental action in the closing experiment process is adjusted according to the pressure change difference value, and the method comprises the following steps:
step b101: setting the experimental interval time of two steam valves for continuously closing experiments;
step b102: judging whether the pressure change difference value is reduced to a pressure stabilizing interval after the previous steam valve closing experiment is finished and the experimental interval duration is reached;
step b103: if the pressure change difference value is reduced to a pressure stabilizing interval, starting to execute a closing experiment on the later steam valve;
if the pressure variation difference value is not reduced to the pressure stabilizing section, the experimental interval duration is increased until the pressure variation difference value is reduced to the pressure stabilizing section, and the closing experiment of the later steam valve is started.
In this embodiment, since the main steam pressure of the unit fluctuates immediately after the closing experiment of one valve is completed, that is, the flow command and the load of the unit need to oscillate for several periods to return to the original values, it is known from the historical data of the closing experiment of a single valve, and after the closing experiment of a single valve is completed, the main steam pressure of the unit needs about 10s to be stable. Therefore, in this embodiment, 10s is taken as the experimental interval duration of setting two steam valves for continuously performing the closing experiment, and the experimental interval durations under different experimental conditions are also different, so that the initially set experimental interval duration can be increased by increasing the experimental interval duration, for example, when the pressure variation difference is not reduced to the pressure stabilizing interval, by a step size of 1-2 s; the main steam pressure can be ensured to be stable after the closing experiment of the previous valve is completed, and then the closing experiment of the next valve is carried out.
As a further optimization of this embodiment, the present invention preferably performs the adjustment of the main steam pressure in a combined manner, for example, in a combined manner of adjusting the switching rate (step a 01-step a 03), the experimental interval duration (step b 01-step b 03), and the boiler combustion amount (step c 01-step c 02) when the steam pressure rising rate exceeds or far exceeds the rising rate threshold; when the steam pressure rising rate is lower than the rising rate threshold, a combination mode of adjusting the switching rate (step a 01-step a 03) and the experimental interval duration (step b 01-step b 03) is adopted.
In the embodiment, in the closing experiment process, the pressure rise is stable and the amplitude is smaller in the high-pressure valve closing process through the adjustment of the switching speed of the steam valve, the experimental interval duration and the boiler combustion amount; the minimum value of the main steam pressure is 18.96MPa, the maximum value is 19.96MPa, the difference between the main steam pressure after test recovery and the main steam pressure before test (19.64 MPa) is about 0.56MPa, and the pressure fluctuation amplitude is controlled within 1MPa, so that the safe operation of the unit can be ensured.
Secondly, the invention has stronger reference significance for safe operation after the domestic transformation of the same type of units.
FIG. 2 is a block diagram of a method for reducing pressure fluctuations in a turbine valve closing test according to an alternative embodiment of the present invention, and as shown in FIG. 2, an apparatus for reducing pressure fluctuations in a turbine valve closing test is used to implement the method for reducing pressure fluctuations in a turbine valve closing test, where the apparatus includes:
the acquisition module is used for acquiring the main steam pressure of the steam turbine steam valve in the closing test process;
the calculation module is used for calculating a pressure change difference value between the main steam pressure and a preset pressure, wherein the preset pressure is the main steam pressure of a steam turbine steam valve in a stable load state of the steam turbine;
and the adjusting module is used for adjusting the experimental action in the closing test process according to the pressure change difference value so as to enable the main steam pressure to approach the preset pressure.
The device for reducing the pressure fluctuation of the steam valve closing test of the steam turbine comprises a processor and a memory, wherein the acquisition module, the calculation module, the adjustment module and the like are all stored in the memory as program units, and the processor executes the program units stored in the memory to realize corresponding functions.
The invention can effectively reduce the pressure fluctuation of the main steam, can control the pressure fluctuation of the main steam in a relatively small range, can ensure the safe operation of the unit, and has stronger reference significance for the safe operation of the unit after the domestic transformation of the same type of unit.
The embodiment of the invention provides electronic equipment, which comprises a memory, a processor and a computer program stored in the memory and capable of running on the processor, wherein the method for reducing the pressure fluctuation of a steam valve closing test of a steam turbine is realized when the processor executes the computer program.
The invention also provides a computer readable storage medium having stored thereon a computer program, characterized in that the program when executed by a processor implements the above method of reducing pressure fluctuations in a steam turbine valve closing test.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
In one typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.
The memory may include volatile memory in a computer-readable medium, random Access Memory (RAM) and/or nonvolatile memory, etc., such as Read Only Memory (ROM) or flash RAM. Memory is an example of a computer-readable medium.
Computer readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of storage media for a computer include, but are not limited to, phase change memory (PRAM), static Random Access Memory (SRAM), dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), read Only Memory (ROM), electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium, which can be used to store information that can be accessed by a computing device. Computer-readable media, as defined herein, does not include transitory computer-readable media (transmission media), such as modulated data signals and carrier waves.
It should also be noted that 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 one … …" does not exclude the presence of other like elements in a process, method, article or apparatus that comprises an element.
The foregoing is merely exemplary of the present application and is not intended to limit the present application. Various modifications and changes may be made to the present application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc. which are within the spirit and principles of the present application are intended to be included within the scope of the claims of the present application.
Claims (10)
1. A method of reducing pressure fluctuations in a steam turbine valve closing test, the method comprising:
acquiring the main steam pressure of the steam valve in the closing test process;
calculating a pressure change difference value between the main steam pressure and a preset pressure, wherein the preset pressure is the main steam pressure of a steam valve in a stable load state of the steam turbine;
and adjusting the experimental action in the closing test process according to the pressure change difference value so as to enable the main steam pressure to approach the preset pressure.
2. The method of claim 1, wherein the experimental action comprises: at least one of the opening and closing rate of the steam valve, the experimental interval duration and the boiler combustion amount.
3. The method of claim 2, wherein adjusting the experimental actions during the shut-down test based on the pressure change differential comprises:
calculating the variation amplitude of the main steam pressure according to the pressure variation difference value;
determining a magnitude of decrease in the valve opening and closing rate that matches a magnitude of change in the main steam pressure;
and reducing the opening and closing speed of the steam valve according to the reducing amplitude of the opening and closing speed of the steam valve.
4. The method of claim 2, wherein adjusting the experimental actions during the shut-down test based on the pressure change differential comprises:
calculating the rising rate of the main steam pressure according to the pressure change difference value;
and if the rising rate of the main steam pressure exceeds a rising rate threshold value, reducing the combustion amount of the boiler.
5. The method of claim 4, wherein if the rate of rise of the main vapor pressure does not exceed the rate of rise threshold, the opening and closing rate of the vapor valve is reduced to bring the main vapor pressure closer to a predetermined pressure.
6. The method of claim 2, wherein adjusting the experimental actions during the shut-down test based on the pressure change differential comprises:
setting the experimental interval time of two steam valves for continuously closing experiments;
judging whether the pressure change difference value at the moment is reduced to be within a pressure stabilizing interval or not at the moment when the previous steam valve closing experiment is finished and the experiment interval duration is reached;
if the pressure change difference value at the moment is reduced to be within the pressure stabilizing interval, starting a closing experiment of a later steam valve;
if the pressure change difference value at the moment is not reduced to the pressure stabilizing interval, the experimental interval duration is increased until the pressure change difference value is reduced to the pressure stabilizing interval, and the closing experiment of the next steam valve is started.
7. The method as recited in claim 4, further comprising:
calculating the rising rate of the main steam pressure according to the pressure change difference value;
if the rising rate of the main steam pressure is far more than the rising rate threshold value, reducing the boiler combustion amount and the switching rate of the steam valve;
if the rising rate of the main steam pressure does not exceed the rising rate threshold, the switching rate of the steam valve is reduced so that the main steam pressure approaches the preset pressure.
8. An apparatus for reducing turbine steam valve closure test pressure fluctuations, the apparatus for implementing the method of reducing turbine steam valve closure test pressure fluctuations of any of claims 1-7, the apparatus comprising:
the acquisition module is used for acquiring the main steam pressure of the steam turbine steam valve in the closing test process;
the calculation module is used for calculating a pressure change difference value between the main steam pressure and a preset pressure, wherein the preset pressure is the main steam pressure of a steam turbine steam valve in a stable load state of the steam turbine;
and the adjusting module is used for adjusting the experimental action in the closing test process according to the pressure change difference value so as to enable the main steam pressure to approach the preset pressure.
9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor, when executing the computer program, implements the method of reducing turbine steam valve closure test pressure fluctuations of any one of claims 1-7.
10. A computer readable storage medium having stored thereon a computer program, which when executed by a processor, implements the method of reducing pressure fluctuations in a steam turbine valve closing test of any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310196978.9A CN116067560A (en) | 2023-02-23 | 2023-02-23 | Method and device for reducing pressure fluctuation of main steam valve closing test of steam turbine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310196978.9A CN116067560A (en) | 2023-02-23 | 2023-02-23 | Method and device for reducing pressure fluctuation of main steam valve closing test of steam turbine |
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| CN116067560A true CN116067560A (en) | 2023-05-05 |
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| CN202310196978.9A Pending CN116067560A (en) | 2023-02-23 | 2023-02-23 | Method and device for reducing pressure fluctuation of main steam valve closing test of steam turbine |
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| CN (1) | CN116067560A (en) |
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- 2023-02-23 CN CN202310196978.9A patent/CN116067560A/en active Pending
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