A steam turbine protection method, system, electronic device and medium

Abstract

The application discloses a steam turbine protection method, system, electronic equipment and medium, and is applied to the field of steam turbine control. The steam turbine protection method provided by the application comprises the following steps: judging whether instruction information sent by a steam turbine emergency trip system meets a preset protection condition, so as to obtain a corresponding judgment result; adjusting an unloading valve according to the judgment result, so as to control opening or closing of a main steam valve of the steam turbine; and adjusting a servo valve according to the judgment result, so as to control opening or closing of a governing valve of the steam turbine. The application adjusts the unloading valve and the servo valve, controls the main steam valve and the governing valve of the steam turbine to be closed through an electric control signal, so that the same effect as opening an AST electromagnetic valve is achieved, the safe shutdown of the unit is ensured, and the safety protection means is increased. The problem that the safety oil cannot be unloaded due to the jamming of the AST electromagnetic valve and the blockage of a drain hole in a safety oil system of the steam turbine, and thus the safe shutdown of the steam turbine cannot be ensured, is avoided.

Description

Technical Field

[0001] This application relates to the field of steam turbine control, and in particular to a steam turbine protection method, system, electronic equipment, and medium. Background Technology

[0002] Turbine shutdown protection is an important guarantee for the safe operation of steam turbines. When the turbine protection is activated, the turbine shutdown protection releases turbine safety oil into the main oil tank by opening the AST solenoid valve. By reducing the pressure of the turbine safety oil, the main steam valves and regulating valves of the turbine are mechanically closed due to the lack of power EH oil (fire-resistant oil), thereby ensuring the safe shutdown of the steam turbine.

[0003] In some cases, poor EH oil quality may cause the AST solenoid valve to stick, preventing it from operating correctly or the safety oil drain hole from becoming blocked. This results in the safety oil maintaining a certain pressure, and the main steam valve and regulating valve still having EH oil, making it impossible to mechanically close the main steam valve and regulating valve. Consequently, the turbine cannot be safely shut down, posing significant risks such as overspeed.

[0004] In recent years, the turbine protection system in thermal power plants has been the ETS system, short for Emergency Trip System. When a turbine malfunctions, or when the generator or main boiler fuel trips, it automatically activates the shut-off circuit to quickly close the steam inlet valves (main steam valves and regulating valves). The ETS system automatically activates the shut-off circuit based on the AST solenoid valve test. By opening the AST solenoid valve, the hydraulic control system of each turbine regulating valve loses its power oil pressure, causing the valves to close by spring force, thus shutting down the turbine. When the AST solenoid valve is blocked, the ETS system cannot automatically shut off the circuit. The turbine regulating valves lose their power oil pressure, and the regulating valves and main steam valves remain in their operating positions, unable to respond to the corresponding protection signals. This could potentially lead to turbine damage, overspeed, and other serious accidents.

[0005] In view of the above-mentioned technologies, finding a turbine protection method is an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0006] The purpose of this application is to provide a turbine protection method, system, electronic equipment, and medium. This application regulates the unloading valve and servo valve, and controls the turbine's main steam valve and regulating valve to close via electrical control signals, thereby achieving the same effect as opening the AST solenoid valve, ensuring safe unit shutdown and increasing safety protection measures. It avoids the problem of safety oil not being able to be discharged due to jamming of the AST solenoid valve or blockage of the drain hole in the turbine safety oil system, thus preventing the turbine from safely shutting down.

[0007] To solve the above-mentioned technical problems, this application provides a turbine protection method, including:

[0008] Determine whether the command information issued by the turbine emergency trip system meets the preset protection conditions in order to obtain the corresponding judgment result;

[0009] The unloading valve is adjusted according to the judgment result to control the opening or closing of the main steam valve of the steam turbine;

[0010] The servo valve is adjusted based on the judgment result to control the opening or closing of the turbine's regulating valve.

[0011] Preferably, determining whether the command information issued by the turbine emergency trip system meets the preset protection conditions includes:

[0012] Obtain the first trip command information issued by the turbine emergency shutdown system;

[0013] Obtain the second trip command information issued by the turbine emergency shutdown system;

[0014] Obtain the third trip command information issued by the turbine emergency shutdown system;

[0015] Select at least two sets of information from the first trip instruction information, the second trip instruction information, and the third trip instruction information to obtain the corresponding selection information;

[0016] Determine whether the selected information meets the preset protection conditions.

[0017] Preferably, the unloading valve is adjusted according to the judgment result to control the opening or closing of the main steam valve of the steam turbine, including:

[0018] When the command information issued by the turbine emergency shutdown system meets the preset protection conditions, the unloading valve is energized to control the main steam valve of the turbine to close.

[0019] When the command information issued by the turbine emergency shutdown system does not meet the preset protection conditions, the unloading valve is de-energized to control the opening of the turbine's main steam valve.

[0020] Preferably, it further includes:

[0021] Determine the current state of the steam turbine;

[0022] Determine whether the turbine is currently in a test state, and adjust the unloading valve according to the turbine's current state.

[0023] Preferably, determining whether the turbine is currently in a test state and adjusting the unloading valve according to the turbine's current state includes:

[0024] When the turbine is currently in the test state, the unloading valve is energized to control the turbine's main steam valve to close.

[0025] When the turbine is not currently in the test state, the unloading valve is de-energized to control the opening of the turbine's main steam valve.

[0026] Preferably, the servo valve is adjusted according to the judgment result to control the opening or closing of the turbine's regulating valve, including:

[0027] When the command information issued by the turbine emergency shutdown system meets the preset protection conditions, the threshold of the servo valve is adjusted to the preset target threshold to control the turbine regulating valve to close.

[0028] If the command information issued by the turbine emergency shutdown system does not meet the preset protection conditions, the current threshold of the servo valve is maintained, and the opening size of the servo valve is adjusted according to the current control system command.

[0029] Preferably, the regulating valve of the steam turbine includes a first regulating valve whose pressure value meets a preset high pressure range and a second regulating valve whose pressure value meets a preset medium pressure range.

[0030] To address the above problems, this application also provides a steam turbine protection system, comprising:

[0031] The judgment module is used to determine whether the command information issued by the turbine emergency shutdown system meets the preset protection conditions, so as to obtain the corresponding judgment result;

[0032] The first adjustment module is used to adjust the unloading valve according to the judgment result in order to control the opening or closing of the main steam valve of the steam turbine.

[0033] The second adjustment module is used to adjust the servo valve according to the judgment result in order to control the opening or closing of the turbine's regulating gate.

[0034] To address the aforementioned problems, this application also provides an electronic device, including a memory for storing computer programs;

[0035] A processor is used to execute computer programs to implement the steps of the turbine protection method described above.

[0036] To address the aforementioned problems, this application also provides a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the steps of the aforementioned turbine protection method.

[0037] This application provides a turbine protection method, comprising: determining whether the command information issued by the turbine emergency trip system meets preset protection conditions to obtain a corresponding judgment result; adjusting the unloading valve according to the judgment result to control the opening or closing of the turbine's main steam valve; and adjusting the servo valve according to the judgment result to control the opening or closing of the turbine's regulating valve. This application adjusts the unloading valve and servo valve, and controls the turbine's main steam valve and regulating valve to close via an electrical control signal, thereby achieving the same effect as opening the AST solenoid valve, ensuring safe unit shutdown and increasing safety protection measures. It avoids the problem of safety oil not being able to be discharged due to jamming of the AST solenoid valve in the turbine safety oil system or blockage of the drain hole, thus preventing the turbine from safely shutting down. Attached Figure Description

[0038] To more clearly illustrate the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1 The circuit diagram for the AST solenoid valve in the turbine safety oil system;

[0040] Figure 2 A flowchart of a turbine protection method provided in this application embodiment;

[0041] Figure 3 A logic diagram of the regulating unloading valve provided in an embodiment of this application;

[0042] Figure 4 A logic diagram of a regulating servo valve provided in an embodiment of this application;

[0043] Figure 5 A module diagram of a steam turbine protection system provided in this application embodiment;

[0044] Figure 6 A structural diagram of an electronic device provided in another embodiment of this application. Detailed Implementation

[0045] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this application.

[0046] The core of this application is to provide a steam turbine protection method, system, electronic device, and medium.

[0047] To enable those skilled in the art to better understand the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0048] In recent years, when turbine malfunctions, generator trips, or boiler main fuel trips occur, it can automatically activate the shut-off circuit to quickly close the steam inlet valves (all main steam valves and regulating valves). The turbine emergency trip system (ETS) automatically activates the shut-off circuit based on the AST solenoid valve test. By opening the AST solenoid valve, the hydraulic control system of each turbine regulating valve loses power oil pressure, causing each regulating valve to close by spring force, thus achieving the function of shutting down the turbine. When the AST solenoid valve is blocked, the turbine emergency trip system cannot automatically shut off the circuit. The turbine regulating valves lose power oil pressure, and the regulating valves and main steam valves remain in the working position, unable to respond to the corresponding protection action signals, which could potentially lead to turbine damage, overspeed, and other major accidents. Figure 1 As shown, AST solenoid valve 1 and AST solenoid valve 3 form the first group, while AST solenoid valve 2 and AST solenoid valve 4 form the second group. The second group and the first group are redundant with each other.

[0049] When the ETS is activated, AST solenoid valve 1 and AST solenoid valve 3 are activated, and the safety oil is released without pressure into the EH (fire-resistant oil) tank through the pipelines of AST solenoid valve 1 and AST solenoid valve 3. When the safety oil is lost, the EH power oil is released into the safety oil pipeline through the main steam valve and regulating valve, and then enters the drain pipe. This causes the high-pressure main steam valve and the high and medium pressure regulating valves to lose power and close the valves by relying on the spring force.

[0050] Alternatively, when the ETS is activated, AST solenoid valves 2 and 4 will activate, and safety oil will leak unpressurized into the EH oil tank through the pipelines of AST solenoid valves 2 and 4. Once the safety oil is gone, the EH power oil will leak into the safety oil pipeline through the main steam valve and regulating valve, and then into the drain pipe. This will cause the high-pressure main steam valve and the high and medium pressure regulating valves to lose power and close the valves by relying on the spring force.

[0051] The solenoid valve pipeline is redundantly configured. When the solenoid valve jams, the oil pipeline becomes blocked, preventing safety oil from entering the drain pipe. Consequently, the EH power oil cannot be lost, and the main steam valve and regulating valve cannot close. Similarly, when the oil quality is poor or the internal components are dirty, causing blockage of the drain hole at point A, the same situation will occur, preventing the turbine from safely shutting down.

[0052] Figure 2 A flowchart of a turbine protection method provided in this application embodiment is shown in the figure, including the following steps:

[0053] S10: Determine whether the command information issued by the turbine emergency trip system meets the preset protection conditions, so as to obtain the corresponding judgment result.

[0054] In a specific embodiment, the Emergency Trip System (ETS) automatically activates the shut-off circuit to quickly close the steam inlet valves (main steam valves and regulating valves) when the turbine malfunctions, the generator trips, or the boiler main fuel trips. The ETS automatically activates the shut-off circuit by testing the AST solenoid valve. By opening the AST solenoid valve, the hydraulic control system of each turbine valve loses its power oil pressure, causing the valves to close by spring force, thus shutting down the turbine. Therefore, the ETS determines the current turbine status by receiving turbine information (e.g., turbine protection trip signals, reset commands, status display signals, and some important signals from the ETS system itself), and then sends this information to the Digital Electro-Hydraulic Control System (DEH). The DEH receives the command information sent by the ETS and determines whether the command information meets the preset protection conditions that require the DEH to activate its protection action. The preset protection conditions include, but are not limited to: manual emergency stop buttons on the control panel; unit overspeed (when the turbine speed reaches the action speed greater than or equal to the rated speed, a 3-out-of-2 signal); bearing vibration (or bearing vibration) exceeding the protection action setting value; axial displacement exceeding the protection action setting value; lubricating oil pressure lower than the protection action setting value; generator cooling system failure (determined according to design); control (EH) oil pressure lower than the protection action setting value; trip signal issued by DEH; generator-transformer unit and generator trip protection action; boiler MFT action; condenser vacuum (or back pressure) exceeding the setting value; and other protection items provided by the turbine manufacturer.

[0055] S11: Adjust the unloading valve according to the judgment result to control the opening or closing of the main steam valve of the steam turbine.

[0056] In a specific embodiment, the unloading valve is conditional based on the judgment result. The unloading valve controls the opening or closing of the main steam valve of the steam turbine by whether it is energized or not, achieving the same effect as opening the AST solenoid valve.

[0057] S12: Adjust the servo valve according to the judgment result to control the opening or closing of the turbine regulating valve.

[0058] Similarly, in a specific embodiment, the servo valve is adjusted according to the judgment result. The threshold value of the servo valve controls the opening or closing of the turbine's regulating valve, achieving the same effect as opening the AST solenoid valve.

[0059] This application provides a turbine protection method, comprising: determining whether the command information issued by the turbine emergency trip system meets preset protection conditions to obtain a corresponding judgment result; adjusting the unloading valve according to the judgment result to control the opening or closing of the turbine's main steam valve; and adjusting the servo valve according to the judgment result to control the opening or closing of the turbine's regulating valve. This application adjusts the unloading valve and servo valve, and controls the turbine's main steam valve and regulating valve to close via an electrical control signal, thereby achieving the same effect as opening the AST solenoid valve, ensuring safe unit shutdown and increasing safety protection measures. It avoids the problem of safety oil not being able to be discharged due to jamming of the AST solenoid valve in the turbine safety oil system or blockage of the drain hole, thus preventing the turbine from safely shutting down.

[0060] Based on the above embodiments, as a preferred embodiment, determining whether the command information issued by the turbine emergency trip system meets the preset protection conditions includes:

[0061] Obtain the first trip command information issued by the turbine emergency shutdown system;

[0062] Obtain the second trip command information issued by the turbine emergency shutdown system;

[0063] Obtain the third trip command information issued by the turbine emergency shutdown system;

[0064] Select at least two sets of information from the first trip instruction information, the second trip instruction information, and the third trip instruction information to obtain the corresponding selection information;

[0065] Determine whether the selected information meets the preset protection conditions.

[0066] In a specific embodiment, the DEH system acquires the first trip command information, the second trip command information, and the third trip command information issued by the turbine emergency trip system. As a preferred embodiment, at least two sets of information are selected from the first trip command information, the second trip command information, and the third trip command information to obtain the corresponding selection information, and it is determined whether the selection information meets the preset protection conditions.

[0067] For example: if the first trip command is a turbine protection trip, the corresponding protection condition is whether the trip command indicates a turbine trip; if the second trip command is a reset command, the corresponding protection condition is whether a reset command is received; if the third trip command is some important signals of the ETS system itself, the corresponding protection condition is whether these important signals conform to the standards. At least two sets of information from the first, second, and third trip command are selected to determine whether preset protection conditions are met. These preset protection conditions are determined based on the selected sets of information and are the protection conditions corresponding to the selected sets of information.

[0068] It should be noted that the examples in this application are only one possible way to achieve the desired result, but are not limited to this one method. Users can customize the method according to their needs.

[0069] This application improves the accuracy of judging the current state of the steam turbine by selecting and judging different command information issued by the steam turbine emergency shutdown system.

[0070] Based on the above embodiments, as a preferred embodiment, the unloading valve is adjusted according to the judgment result to control the opening or closing of the main steam valve of the steam turbine, including:

[0071] When the command information issued by the turbine emergency shutdown system meets the preset protection conditions, the unloading valve is energized to control the main steam valve of the turbine to close.

[0072] When the command information issued by the turbine emergency shutdown system does not meet the preset protection conditions, the unloading valve is de-energized to control the opening of the turbine's main steam valve.

[0073] In a specific embodiment, controlling whether the unloading valve is energized controls whether the main steam valve is closed, achieving the same effect as opening the AST solenoid valve via an electrical signal. When the command information issued by the ETS meets the preset protection conditions, the unloading valve is energized, thereby controlling the turbine's main steam valve to close. This ensures that the main steam valve is closed promptly in the event of an AST solenoid valve failure, guaranteeing a safe unit shutdown and adding safety protection measures. Similarly, when the command information issued by the ETS does not meet the preset protection conditions, the unloading valve is de-energized, controlling the turbine's main steam valve to open, allowing the turbine to operate normally.

[0074] This application indirectly controls the main steam valve by controlling the unloading valve, achieving the same effect as opening the AST solenoid valve, and adding safety protection measures.

[0075] Based on the above embodiments, as a preferred embodiment, it further includes:

[0076] Determine the current state of the steam turbine;

[0077] Determine whether the turbine is currently in a test state, and adjust the unloading valve according to the turbine's current state.

[0078] When the turbine is currently in the test state, the unloading valve is energized to control the turbine's main steam valve to close.

[0079] When the turbine is not currently in the test state, the unloading valve is de-energized to control the opening of the turbine's main steam valve.

[0080] In a specific embodiment, the opening and closing of the main steam valve can also be determined by judging the current state of the steam turbine. When the steam turbine is in the test state, the unloading valve is adjusted to energize it, controlling the main steam valve to close. This ensures that the main steam valve is closed in time in case of AST solenoid valve failure, guaranteeing a safe shutdown of the unit and increasing safety protection measures. When the steam turbine is not in the test state, the unloading valve is de-energized to control the opening of the main steam valve, allowing the steam turbine to operate normally.

[0081] It should also be noted that determining whether a state is experimental is only one possible method, but it is not the only possible method. Users can set it themselves according to their needs.

[0082] Based on the above embodiments and the embodiments of this application, as follows: Figure 3 As shown, when the information selected in the command information issued by ETS meets the preset protection conditions, or when the current state of the steam turbine is in the test state, the unloading valve is energized, thereby controlling the main steam valve of the steam turbine to close. This ensures that the main steam valve is closed in time when the AST solenoid valve fails, ensuring the safe shutdown of the unit and increasing safety protection measures.

[0083] Based on the above embodiments, as a preferred embodiment, the servo valve is adjusted according to the judgment result to control the opening or closing of the turbine's regulating valve, including:

[0084] When the command information issued by the turbine emergency shutdown system meets the preset protection conditions, the threshold of the servo valve is adjusted to the preset target threshold to control the turbine regulating valve to close.

[0085] If the command information issued by the turbine emergency shutdown system does not meet the preset protection conditions, the current threshold of the servo valve is maintained, and the opening size of the servo valve is adjusted according to the current control system command.

[0086] The turbine's regulating valves include a first regulating valve whose pressure value meets a preset high-pressure range and a second regulating valve whose pressure value meets a preset medium-pressure range.

[0087] In a specific embodiment, such as Figure 4 As shown, the threshold of the servo valve controls the first and second regulating valves of the steam turbine. When the command information issued by the ETS meets the preset protection conditions, and all other data of the steam turbine meet the normal requirements, the threshold of the servo valve is adjusted to the preset target threshold, thereby controlling the steam turbine's regulating valves to close. This ensures that in the event of a malfunction of the AST solenoid valve, the first and second regulating valves are closed in a timely manner, guaranteeing a safe shutdown of the unit and increasing safety protection measures. Similarly, when the command information issued by the ETS does not meet the preset protection conditions, the current threshold of the servo valve is maintained to keep the steam turbine's regulating valves open, allowing the steam turbine to operate normally. At the same time, the opening size of the servo valve is adjusted according to the current control system specifications.

[0088] It should be noted that, Figure 4 The preset target threshold of -20 is just one possible way to achieve this, but it is not the only way. Users can set it according to their needs.

[0089] This application indirectly controls the regulating gate by controlling the threshold of the servo valve, achieving the same effect as opening the AST solenoid valve, and adding safety protection measures.

[0090] In the above embodiments, turbine protection has been described in detail. This application also provides embodiments corresponding to turbine protection devices. It should be noted that this application describes the embodiments of the device from two perspectives: one is based on functional modules, and the other is based on hardware.

[0091] Figure 5 A turbine protection system module diagram provided for embodiments of this application includes:

[0092] The judgment module 11 is used to judge whether the command information issued by the turbine emergency shutdown system meets the preset protection conditions, so as to obtain the corresponding judgment result;

[0093] The first adjustment module 12 is used to adjust the unloading valve according to the judgment result in order to control the opening or closing of the main steam valve of the steam turbine.

[0094] The second adjustment module 13 is used to adjust the servo valve according to the judgment result in order to control the opening or closing of the turbine's regulating gate.

[0095] Since the embodiments of the apparatus and the embodiments of the method correspond to each other, please refer to the description of the embodiments of the method for the embodiments of the apparatus, which will not be repeated here.

[0096] Figure 6 A structural diagram of an electronic device provided in another embodiment of this application, such as... Figure 6As shown, the electronic device includes: a memory 20 for storing computer programs;

[0097] The processor 21 is used to execute a computer program to implement the steps of the turbine protection method mentioned in the above embodiments.

[0098] The electronic devices provided in this embodiment may include, but are not limited to, smartphones, tablets, laptops, or desktop computers.

[0099] The processor 21 may include one or more processing cores, such as a quad-core processor or an octa-core processor. The processor 21 may be implemented using at least one of the following hardware forms: Digital Signal Processor (DSP), Field-Programmable Gate Array (FPGA), or Programmable Logic Array (PLA). The processor 21 may also include a main processor and a coprocessor. The main processor, also known as the Central Processing Unit (CPU), is used to process data in the wake-up state; the coprocessor is a low-power processor used to process data in the standby state. In some embodiments, the processor 21 may integrate a Graphics Processing Unit (GPU), which is responsible for rendering and drawing the content to be displayed on the screen. In some embodiments, the processor 21 may also include an Artificial Intelligence (AI) processor, which is used to handle computational operations related to machine learning.

[0100] The memory 20 may include one or more computer-readable storage media, which may be non-transitory. The memory 20 may also include high-speed random access memory and non-volatile memory, such as one or more disk storage devices or flash memory devices. In this embodiment, the memory 20 is used to store at least the following computer program 201, which, after being loaded and executed by the processor 21, is capable of implementing the relevant steps of the turbine protection method disclosed in any of the foregoing embodiments. In addition, the resources stored in the memory 20 may also include an operating system 202 and data 203, and the storage method may be temporary storage or permanent storage. The operating system 202 may include Windows, Unix, Linux, etc.

[0101] In some embodiments, the electronic device may further include a display screen 22, an input / output interface 23, a communication interface 24, a power supply 25, and a communication bus 26.

[0102] Those skilled in the art will understand that Figure 6 The structures shown do not constitute a limitation on electronic devices and may include more or fewer components than those shown.

[0103] The electronic device provided in this application includes a memory and a processor. When the processor executes a program stored in the memory, it can implement the following method: a steam turbine protection method.

[0104] Finally, this application also provides an embodiment corresponding to a computer-readable storage medium. The computer-readable storage medium stores a computer program, which, when executed by a processor, implements the steps described in the above method embodiments.

[0105] It is understood that if the methods in the above embodiments are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and executes all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0106] The present application provides a detailed description of a turbine protection method, system, electronic device, and medium. The various embodiments are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to in the method section. It should be noted that those skilled in the art can make various improvements and modifications to this application without departing from the principles of this application, and these improvements and modifications also fall within the protection scope of the claims of this application.

[0107] It should also be noted that, in this specification, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. A method for protecting a steam turbine, characterized in that, include: The system acquires the first trip command information, the second trip command information, and the third trip command information issued by the turbine emergency shutdown system. The first trip command information is protection trip information, the second trip command information is reset command information, and the third trip command information is self-test signal information of the turbine emergency shutdown system. Select at least two sets of information from the first trip instruction information, the second trip instruction information, and the third trip instruction information to obtain the corresponding selection information; Determine whether the selected information meets the preset protection conditions; When the selected information meets the preset protection conditions, the unloading valve is energized to control the main steam valve of the turbine to close, and the threshold of the servo valve is adjusted to the preset target threshold to control the regulating valve of the turbine to close. If the selected information does not meet the preset protection adjustment, the unloading valve is de-energized to control the main steam valve of the turbine to open, and the current threshold of the servo valve is maintained so that the regulating valve of the turbine is in the open state. The opening size of the servo valve is adjusted according to the current control system command.

2. The turbine protection method according to claim 1, characterized in that, Also includes: Determine the current state of the steam turbine; Determine whether the turbine is currently in a test state, and adjust the unloading valve according to the turbine's current state.

3. The turbine protection method according to claim 1, characterized in that, The step of determining whether the current state of the steam turbine is in a test state and adjusting the unloading valve according to the current state of the steam turbine includes: When the turbine is currently in a test state, the unloading valve is energized to control the turbine's main steam valve to close. When the turbine is not in the test state, the unloading valve is de-energized to control the main steam valve of the turbine to open.

4. The turbine protection method according to any one of claims 1-3, characterized in that, The turbine's regulating valves include a first regulating valve whose pressure value meets a preset high-pressure range and a second regulating valve whose pressure value meets a preset medium-pressure range.

5. A steam turbine protection system, characterized in that, include: The judgment module is used to acquire the first trip command information, the second trip command information, and the third trip command information issued by the turbine emergency trip system. The first trip command information is protection trip information, the second trip command information is a reset command information, and the third trip command information is the self-test signal information of the turbine emergency trip system. It selects at least two sets of information from the first, second, and third trip command information to obtain corresponding selection information, and determines whether the selected information meets preset protection conditions. The first adjustment module is used to control the unloading valve to be energized when the selected information meets the preset protection conditions, so as to control the main steam valve of the steam turbine to close, and to adjust the threshold of the servo valve to a preset target threshold so as to control the regulating valve of the steam turbine to close. The second adjustment module is used to control the unloading valve to be de-energized when the selected information does not meet the preset protection adjustment, so as to control the main steam valve of the steam turbine to open, and maintain the current threshold of the servo valve so that the regulating valve of the steam turbine is in the open state, and adjust the opening size of the servo valve according to the current control system instruction.

6. An electronic device, characterized in that, Includes memory used to store computer programs; A processor, configured to implement the steps of the turbine protection method as described in any one of claims 1 to 4 when executing the computer program.

7. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed by a processor, implements the steps of the turbine protection method as described in any one of claims 1 to 4.

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