Steam adjusting device and method based on energy storage type electro-hydraulic actuator

Abstract

The invention discloses a steam adjusting device and method based on an energy storage type electro-hydraulic actuator, and relates to the technical field of steam turbine generator unit testing. The device comprises the energy storage type electro-hydraulic actuator, a steam adjusting valve, a PLC, a monitoring platform, a steam main pipe and steam branch pipes; the monitoring platform responds to the load change instruction, and the PLC generates a first adjusting instruction for indicating the steam adjusting valve to be adjusted to the target valve position; and when the load changes, the energy storage type electro-hydraulic actuator controls the steam adjusting valve to be adjusted to the target valve position based on the first adjusting instruction, so that the target steam flow is discharged from the steam main pipe through the steam branch pipe, or the target steam flow is compensated and flows back to the steam main pipe from the steam branch pipe. The steam flow adjusting device is used for solving the problems that in the prior art, in the transient test process of a steam turbine generator unit, the steam flow adjusting precision is poor, and the safety reliability is poor, and steam flow adjusting of the steam turbine generator unit in the transient test process is rapidly, accurately, safely and reliably completed.

Description

Technical Field

[0001] This application relates to the field of steam turbine generator set testing technology, and in particular to a steam regulation device and method based on an energy storage electro-hydraulic actuator. Background Technology

[0002] During the testing of steam turbine generator sets, it is necessary to test the transient characteristics of generator voltage and speed under sudden load unloading / sudden load increases, and to assess the transient fluctuations and recovery of voltage and speed. During sudden load unloading, the steam flow rate entering the steam turbine generator set decreases rapidly, and the steam header pressure rises rapidly, easily triggering the safety valve. During sudden load increases, the steam flow rate entering the generator increases rapidly, and the steam header pressure drops rapidly, easily causing the steam turbine generator set to shut down under protection. Therefore, it is necessary to regulate the steam flow rate entering the steam turbine generator set to respond quickly to sudden load changes and maintain stable steam header pressure.

[0003] Existing technologies utilize desuperheaters and pressure reducers to regulate steam flow, but these are prone to control overshoot and oscillation when rapidly adjusting steam pressure. Alternatively, servo electric cylinders can be used to regulate steam flow, but these require energization to maintain the commanded valve position, posing a risk of overheating and failure, and making long-term online operation or high-frequency operation difficult. Summary of the Invention

[0004] In response to the aforementioned problems and technical requirements, the applicant has proposed a steam regulation device and method based on an energy storage electro-hydraulic actuator to solve the problems of poor steam flow regulation accuracy and poor safety and reliability in the transient test of steam turbine generator sets in the prior art, and to quickly, accurately and reliably complete the steam flow regulation of steam turbine generator sets during the transient test.

[0005] This application provides a steam regulating device based on an energy storage electro-hydraulic actuator. The device includes: an energy storage electro-hydraulic actuator, a steam regulating valve, a PLC controller, a monitoring platform, a steam main pipe, and steam branch pipes. The energy storage electro-hydraulic actuator is connected to the steam regulating valve, the steam regulating valve is connected to the steam main pipe through the steam branch pipe, the steam main pipe is connected to the steam turbine generator set, and the monitoring platform is connected to the PLC controller and the energy storage electro-hydraulic actuator respectively. The PLC controller is connected to the energy storage electro-hydraulic actuator. The monitoring platform is used to respond to the load adjustment value input by the user, generate the target valve position of the steam regulating valve based on the load adjustment value, and transmit the target valve position to the PLC controller; and when responding to the load change command triggered by the user, it synchronously sends the load change command to the PLC controller and the load control switch, wherein the load control switch is used to control the increase or decrease of the load; The PLC controller is used to respond to the target valve position transmitted by the monitoring platform, generate a first adjustment command to instruct the steam regulating valve to adjust to the target valve position, and send the first adjustment command to the energy storage electro-hydraulic actuator when the load change command is received. The energy storage electro-hydraulic actuator is used to control the steam regulating valve to adjust to the target valve position based on the first adjustment command when receiving the first adjustment command, so as to discharge the target steam flow from the steam header through the steam branch pipe, or to make the target steam flow compensated and returned from the steam branch pipe to the steam header, wherein the target steam flow is the change in the steam flow required by the steam turbine generator set before and after the load change; The final steam flow rate in the steam header enters the steam turbine generator set, and the final steam flow rate is matched with the current load, which is the load obtained after executing the load change command.

[0006] According to the steam regulating device based on an energy storage electro-hydraulic actuator provided in the embodiments of this application, the load changes include: load increase and load decrease; Specifically, when the load change is an increase, the target flow rate is compensated and returned from the steam branch pipe to the steam main pipe; when the load change is a decrease, the target flow rate is discharged from the steam main pipe through the steam branch pipe.

[0007] According to the embodiment of this application, the steam regulating device based on an energy storage electro-hydraulic actuator further includes: three steam pressure switches; One end of the steam pressure switch is connected to the PLC controller, and the other end of the steam pressure switch is connected to the steam header. The steam pressure switch is used to monitor the steam pressure of the steam header and to perform a pressure switch action when the steam pressure is greater than a preset steam pressure. The pressure switch action includes: changing the pressure switch signal received by the PLC controller from open to closed, and changing the pressure switch signal received by the PLC controller from closed to open. The PLC controller is used to acquire the pressure switch signal generated by the steam pressure switch performing the pressure switch action, and generate a second adjustment command based on the pressure switch signal to instruct the steam regulating valve to adjust to a preset valve position.

[0008] According to the steam regulating device based on an energy storage electro-hydraulic actuator provided in the embodiments of this application, the PLC controller is used to determine in real time whether at least two steam pressure switches perform pressure switching actions within a first preset time period and whether the pressure switching actions are maintained for a second preset time period when the current operating mode is determined to be an interlocking mode; if it is determined that at least two steam pressure switches perform pressure switching actions within the preset first time period and the pressure switching actions are maintained for the second preset time period, a second adjustment command is generated to instruct the steam regulating valve to adjust to a preset valve position, and the second adjustment command is sent to the energy storage electro-hydraulic actuator; The energy storage electro-hydraulic actuator is used to control the steam regulating valve to adjust to a preset valve position based on the second adjustment command when a second adjustment command is received.

[0009] According to the steam regulating device based on an energy storage electro-hydraulic actuator provided in the embodiments of this application, the monitoring platform is used to determine the target steam flow corresponding to the load change command based on a preset first correspondence between the load and the steam flow required by the steam turbine generator set; and to determine the target valve position corresponding to the target steam flow based on a preset second correspondence between the steam flow and the valve position of the steam regulating valve.

[0010] According to the steam regulating device based on an energy storage electro-hydraulic actuator provided in the embodiments of this application, the monitoring platform includes: a switching knob and an execution button; The switching knob is used to switch between test mode and interlock mode; wherein, when the current operating mode is determined to be test mode, the monitoring platform allows the user to input load adjustment values ​​and responds to load change commands triggered by the user. The execute button is connected to the PLC controller and the load control switch respectively. When the current operating mode is determined to be the test mode, when the user presses the execute button, the monitoring platform synchronously sends the load change instruction to the PLC controller and the load control switch.

[0011] According to the steam regulating device based on an energy storage electro-hydraulic actuator provided in the embodiments of this application, the monitoring platform further includes: an emergency operation button; The monitoring platform is used to generate a third adjustment command in response to the emergency operation button operated by the user, instructing the steam regulating valve to be adjusted to the fully open state, and to send the third adjustment command to the energy storage electro-hydraulic actuator. The energy storage electro-hydraulic actuator is used to control the steam regulating valve to be adjusted to the fully open state based on the third adjustment command when it receives the third adjustment command.

[0012] According to the embodiment of this application, a steam regulating device based on an energy storage electro-hydraulic actuator is provided. The energy storage electro-hydraulic actuator is used to acquire the actual valve position of the steam regulating valve in real time during the process of adjusting the steam regulating valve to the target valve position; compare the actual valve position and the target valve position to obtain a comparison result; and control the forward or reverse flow of hydraulic oil based on the comparison result.

[0013] According to the steam regulating device based on an energy storage electro-hydraulic actuator provided in the embodiments of this application, when it is determined that the deviation between the actual valve position and the target valve position is less than a preset threshold, the flow of hydraulic oil is stopped and the valve position is locked.

[0014] This application embodiment also provides a steam regulation method based on an energy storage electro-hydraulic actuator, the method comprising: In response to the load adjustment value input by the user, the target valve position of the steam regulating valve is generated based on the load adjustment value, and the load change command triggered by the user is also executed. In response to the target valve position, a first adjustment command is generated to instruct the steam regulating valve to adjust to the target valve position; Based on the first adjustment command, the steam regulating valve is controlled to adjust to the target valve position so as to discharge the target steam flow from the steam main pipe through the steam branch pipe, or to make the target steam flow compensated and returned to the steam main pipe from the steam branch pipe, wherein the target steam flow is the change in the steam flow required by the steam turbine generator set before and after the load change; The final steam flow rate in the steam header enters the steam turbine generator set, and the final steam flow rate is matched with the current load, which is the load obtained after executing the load change command.

[0015] The steam regulating device and method based on an energy storage electro-hydraulic actuator provided in this application embodiment utilizes a monitoring platform to respond to user-input load adjustment values ​​and generate a target valve position for the steam regulating valve. Upon responding to a user-triggered load change command, the device synchronously sends the load change command to a PLC controller and a load control switch. The PLC controller then generates a first adjustment command instructing the steam regulating valve to adjust to the target valve position, and immediately sends this first adjustment command to the energy storage electro-hydraulic actuator upon receiving the load change command. Using the energy storage electro-hydraulic actuator, while the load control switch controls the load change, the device controls the steam regulating valve based on the first adjustment command. The steam regulating valve is adjusted to the target valve position to discharge the target steam flow from the steam header through the steam branch pipe, or to compensate for the return of the target steam flow from the steam branch pipe to the steam header, so that the final steam flow in the steam header enters the turbine generator set. This final steam flow matches the current load, which is the load obtained after executing the load change command. It can be seen that this application accurately regulates the steam flow in the steam branch pipe based on load changes to maintain the pressure stability of the steam header, ensure the safe and stable operation of the turbine generator set, and quickly, accurately, safely and reliably complete the steam flow regulation of the turbine generator set during transient testing. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is one of the structural schematic diagrams of the steam regulating device provided in the embodiments of this application; Figure 2 This is a second schematic diagram of the steam regulating device provided in the embodiments of this application; Figure 3 This is a schematic diagram of the energy storage electro-hydraulic actuator provided in the embodiments of this application; Figure 4 This is one of the schematic flowcharts of the steam regulation method based on an energy storage electro-hydraulic actuator provided in the embodiments of this application; Figure 5 This is the second schematic flowchart of the steam regulation method based on an energy storage electro-hydraulic actuator provided in the embodiments of this application; Figure 6 This is the third schematic flowchart of the steam regulation method based on an energy storage electro-hydraulic actuator provided in the embodiments of this application. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, 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, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0019] This application provides a steam regulating device based on an energy storage electro-hydraulic actuator. For example... Figure 1 As shown, the device includes: an energy storage electro-hydraulic actuator 101, a steam regulating valve 102, a PLC controller 103, a monitoring platform 104, a steam main pipe 105, and a steam branch pipe 106.

[0020] The energy storage type electro-hydraulic actuator 101 is connected to the steam regulating valve 102. The steam regulating valve 102 is connected to the steam main pipe 105 through the steam branch pipe 106. The steam main pipe 105 is connected to the steam turbine generator set 107. The monitoring platform 104 is connected to the PLC controller 103 and the energy storage type electro-hydraulic actuator 101 respectively. The PLC controller 103 is connected to the energy storage type electro-hydraulic actuator 101.

[0021] The monitoring platform 104 is used to respond to the load adjustment value input by the user, generate the target valve position of the steam regulating valve 102 based on the load adjustment value, and transmit the target valve position to the PLC controller 103; and when responding to the load change command triggered by the user, it synchronously sends the load change command to the PLC controller 103 and the load control switch 108.

[0022] The load control switch 108 is used to control the increase or decrease of the load.

[0023] The PLC controller 103 is used to respond to the target valve position transmitted by the monitoring platform 104, generate a first adjustment command to instruct the steam regulating valve to adjust to the target valve position, and immediately send the first adjustment command to the energy storage electro-hydraulic actuator 101 when a load change command is received.

[0024] The energy storage type electro-hydraulic actuator 101 is used to control the steam regulating valve 102 to adjust to the target valve position based on the first adjustment command while the load control switch 108 controls the load change, so as to discharge the target steam flow from the steam header 105 through the steam branch pipe 106, or to make the target steam flow compensate and flow back from the steam branch pipe 106 to the steam header 105.

[0025] The target steam flow rate is the change in the required steam flow rate of the turbine generator set 107 before and after the load change.

[0026] The final steam flow in the steam header 105 enters the turbine generator set 107. The final steam flow is matched with the current load, which is the load obtained after executing the load change command.

[0027] Among them, Figure 1 The steam branch pipe 106 is indicated by a dashed line, and the steam main pipe 105 is indicated by a thick solid line. This is only for illustrative purposes.

[0028] The steam regulating device based on a storage electro-hydraulic actuator provided in this application embodiment utilizes a monitoring platform to respond to user-input load adjustment values ​​and generate a target valve position for the steam regulating valve. Upon responding to a user-triggered load change command, the device synchronously sends the load change command to the PLC controller and the load control switch. The PLC controller then generates a first adjustment command instructing the steam regulating valve to adjust to the target valve position, and immediately sends this first adjustment command to the storage electro-hydraulic actuator upon receiving the load change command. Using the storage electro-hydraulic actuator, while the load control switch controls the load change, the device controls the steam regulating valve based on the first adjustment command. The steam regulating valve is adjusted to the target valve position to discharge the target steam flow from the steam header through the steam branch pipe, or to compensate the return of the target steam flow from the steam branch pipe to the steam header, so that the final steam flow in the steam header enters the turbine generator set. This final steam flow matches the current load, which is the load obtained after executing the load change command. It can be seen that this application accurately regulates the steam flow in the steam branch pipe based on load changes to maintain the pressure stability of the steam header, ensure the safe and stable operation of the turbine generator set, and quickly, accurately, safely and reliably complete the steam flow regulation of the turbine generator set during transient testing.

[0029] In one specific embodiment, load changes include: load increase and load decrease.

[0030] Specifically, when the load changes to an increase, the target flow rate is compensated and returned from the steam branch pipe 106 to the steam main pipe 105; when the load changes to a decrease, the target flow rate is discharged from the steam main pipe 105 through the steam branch pipe 106.

[0031] In one specific embodiment, the monitoring platform 104 is used to determine the target steam flow corresponding to the load change command based on a preset first correspondence between the load and the steam flow required by the steam turbine generator set; and to determine the target valve position corresponding to the target steam flow based on a preset second correspondence between the steam flow and the valve position of the steam regulating valve.

[0032] Specifically, a first correspondence between load and steam flow demand of steam turbine generator set is created based on historical data and / or test data, and a second correspondence between steam flow and steam regulating valve position is created.

[0033] The first and second correspondences can be displayed as curves or tables, etc.

[0034] Specifically, the target valve position can also be determined by the user on the monitoring platform 104, which sends the user-input target valve position to the PLC controller 103.

[0035] In one specific embodiment, the monitoring platform 104 includes a switching knob and an execution button.

[0036] The switch button is used to switch between test mode and interlock mode. Only when the current operating mode is determined to be test mode, the monitoring platform 104 allows the user to input load adjustment values ​​and respond to load change commands triggered by the user.

[0037] The execute button is connected to both the PLC controller 103 and the load control switch 108. Only when the current operating mode is determined to be test mode, when the user presses the execute button, the monitoring platform 104 synchronously sends load change instructions to the PLC controller 103 and the load control switch 108. In one specific embodiment, as shown... Figure 2 As shown, the device also includes three steam pressure switches 201.

[0038] One end of the steam pressure switch 201 is connected to the PLC controller 103, and the other end of the steam pressure switch 201 is connected to the steam header 105.

[0039] Steam pressure switch 201 is used to monitor the steam pressure of steam header 105 and to perform pressure switch action when the steam pressure is greater than the preset steam pressure.

[0040] The pressure switch action includes: the action of changing the pressure switch signal received by the PLC controller 103 from open to closed, and the action of changing the pressure switch signal received by the PLC controller 103 from closed to open.

[0041] The PLC controller 103 is used to acquire the pressure switch signal generated by the steam pressure switch performing the pressure switch action, and generate a second adjustment command based on the pressure switch signal to instruct the steam regulating valve 102 to adjust to the preset valve position.

[0042] Among them, Figure 2 PK represents the steam pressure switch.

[0043] In one specific embodiment, the PLC controller 103 is used to determine in real time, based on the pressure switch signal, whether at least two steam pressure switches 201 have performed pressure switching actions within a first preset time period, and whether the pressure switching actions have been maintained for a second preset time period, when the current operating mode is determined to be the interlocking mode; if it is determined that at least two steam pressure switches 201 have performed pressure switching actions within the first preset time period, and the pressure switching actions have been maintained for the second preset time period, a second adjustment command is generated to instruct the steam regulating valve 102 to adjust to a preset valve position, and the second adjustment command is immediately sent to the energy storage electro-hydraulic actuator 101.

[0044] An energy storage type electro-hydraulic actuator 101 is used to control the steam regulating valve 102 to adjust to a preset valve position based on the second adjustment command when a second adjustment command is received.

[0045] Specifically, after the PLC controller 103 acquires the pressure switch signals of at least two steam pressure switches, it controls the energy storage electro-hydraulic actuator 101 to quickly adjust the steam regulating valve 102 to the preset valve position, and part of the steam flow is discharged through the steam branch pipe 106, thereby releasing the pressure of the steam main pipe 105 to below the safe pressure.

[0046] The preset valve position is a valve position predetermined based on actual conditions. Users can set it according to their own actual needs, and this application does not impose any restrictions.

[0047] In one specific embodiment, the monitoring platform 104 further includes an emergency operation button.

[0048] The monitoring platform 104 is used to generate a third adjustment command that instructs the steam regulating valve 102 to be adjusted to the fully open state when the user presses the emergency operation button, and immediately sends the third adjustment command to the accumulator electro-hydraulic actuator 101.

[0049] An energy storage type electro-hydraulic actuator 101 is used to control the steam regulating valve 102 to adjust to the fully open state based on the third adjustment command when a third adjustment command is received.

[0050] Specifically, under any circumstances (whether in test mode or interlock mode), when the operator presses the emergency operation button, the energy storage electro-hydraulic actuator 101 controls the steam regulating valve 102 to be adjusted to the fully open state, so as to discharge the steam flow in the steam header 105 from the steam branch pipe 106 as quickly and as much as possible, ensuring the safety of the steam pipeline and the steam turbine generator set.

[0051] In one specific embodiment, the monitoring platform 104 includes an operation panel and a host industrial control computer. The host industrial control computer is connected to the PLC controller 103 and the energy storage electro-hydraulic actuator 101, respectively. The operation panel is connected to the PLC controller 103 and the energy storage electro-hydraulic actuator 101, respectively.

[0052] Specifically, the instructions generated by the operation panel are implemented based on the connection between the operation panel and the PLC controller 103 and the energy storage electro-hydraulic actuator 101, and the instructions generated by the host industrial computer are implemented based on the connection between the host industrial computer and the PLC controller 103 and the energy storage electro-hydraulic actuator 101.

[0053] The control panel includes status lights, for example, green indicates that the steam regulator is operating normally, and red indicates that the steam regulator is operating abnormally; a switching button for switching between test mode and interlock mode; an execution button connected to the PLC controller 103 and the load control switch 108 respectively for synchronous execution of load change commands; and an emergency operation button connected to the energy storage electro-hydraulic actuator 101 for execution of emergency valve opening commands.

[0054] In one specific embodiment, the energy storage type electro-hydraulic actuator 101 is used to acquire the actual valve position of the steam regulating valve 102 in real time during the process of adjusting to the target valve position; compare the actual valve position and the target valve position to obtain a comparison result; and control the forward or reverse flow of hydraulic oil based on the comparison result.

[0055] In one specific embodiment, if the comparison result shows that the deviation between the actual valve position and the target valve position is less than a preset threshold, the flow of hydraulic oil is stopped and the valve position is locked.

[0056] Specifically, such as Figure 3 As shown, the energy storage type electro-hydraulic actuator 101 includes: a controller 301, a hydraulic oil pressure switch 302, a power unit 303, an accumulator 304, a control valve group 305, a drive cylinder 306, and a feedback module 307.

[0057] The steam regulating valve 102 is connected to the drive cylinder 306 and the feedback module 307 respectively.

[0058] The controller 301 is equipped with a battery for emergency power supply; the power unit 303 is equipped with an electric pump to increase the hydraulic oil pressure of the accumulator 304; the control valve group 305 includes a proportional control valve and a hydraulic check valve, the former is used to regulate the flow of hydraulic oil into and out of the drive cylinder 306, and the latter is used to cut off the flow of hydraulic oil; the feedback module 307 is used to indicate the current actual position (actual valve position) of the valve stem of the steam regulating valve 102.

[0059] Specifically, the energy storage type electro-hydraulic actuator 101 is used to compare the actual valve position indicated by the first adjustment command and the feedback module 307. The controller 301 controls the high-pressure hydraulic oil inside the accumulator 304 to enter the drive cylinder 306 through the proportional regulating valve, pushing the valve stem to move up or down quickly. When the deviation between the first adjustment command and the actual valve position is less than a preset threshold, the hydraulic control check valve stops the flow of hydraulic oil and locks the valve position.

[0060] The following is a detailed description of the working process of the steam regulating device to illustrate this application: First, the transient characteristic test of the steam turbine generator set includes two processes: sudden load unloading and sudden load loading. Before the transient characteristic test begins, the steam regulating valve 102 is fully closed, and the flow from the steam header 105 enters the steam turbine generator set 107.

[0061] Second, during the preparation for the load unloading test, the operator turns the switch knob to test mode on the monitoring platform 104 and inputs the specific load adjustment value into the program interface of the upper industrial control computer. Based on the first and second correspondences, the target valve position is obtained and displayed on the program interface.

[0062] Third, when the load unloading test begins, after the operator confirms that the status of each system is normal, press the execute button to simultaneously trigger the load control switch 108 to act and the PLC controller 103 to output the first adjustment command to characterize the valve opening.

[0063] Fourth, the accumulator-type electro-hydraulic actuator 101 controls the high-pressure hydraulic oil inside the accumulator to enter the drive cylinder through the proportional regulating valve based on the first adjustment command, pushing the valve stem to move upward rapidly, and when the deviation between the actual valve position and the target valve position is less than a preset threshold, the hydraulic control check valve stops the flow of hydraulic oil and locks the valve position.

[0064] The process controls the steam regulating valve 102 to open quickly to the target valve position, and the target steam flow is discharged through the steam branch pipe 106. The final steam flow of the steam header 105 matches the current load of the unit. The load unloading process and the sudden drop in the inlet steam flow are completed simultaneously, and the steam header pressure remains stable.

[0065] Specifically, the load surge test process is similar to the above process, except that the first adjustment command in the third step indicates valve closure, and the valve stem is pushed down rapidly in the fourth step to achieve the target steam flow compensation return to the steam header 105. The final steam flow of the steam header 105 matches the current load of the unit. The load surge process and the steam flow surge process are completed synchronously, and the steam header pressure remains stable.

[0066] Fifth, after the transient characteristic test is completed, the operator will turn the mode switch button to the interlock mode.

[0067] This application utilizes an energy storage type electro-hydraulic actuator 101 to synchronously open the valve when the load of the steam turbine generator set is suddenly unloaded, so as to discharge the target steam flow through the steam branch pipe; and to synchronously close the valve when the load is subsequently suddenly increased, so as to compensate and return the target steam flow to the steam main pipe; to ensure that the steam flow entering the unit matches the current load of the unit and to maintain the pressure of the steam main pipe is stable.

[0068] It utilizes an accumulator-type electro-hydraulic actuator to achieve rapid and precise regulation of the steam regulating valve. The full-stroke action time of the steam regulating valve is less than 0.8 seconds, and the valve position deviation is no higher than 0.3%. The hydraulically controlled check valve in the control valve group stops the flow of hydraulic oil, locking the valve to a designated position under steam purging without the need for energization, eliminating the risk of overheating failure, and maintaining the valve position even after power failure. The power unit is used to maintain the hydraulic oil pressure of the accumulator during intermittent operation. By using an accumulator, the starting response speed requirement and starting frequency of the power unit are reduced, saving on configuration costs and extending its service life. In interlock mode, the steam pressure switch triggers the electro-hydraulic actuator to quickly open the valve and release pressure in overpressure mode, allowing the steam regulating device to be used as a pre-operational safety valve for extended periods. The emergency quick-open button bypasses the host industrial computer and PLC controller, directly connecting to the electro-hydraulic actuator, whose controller is equipped with a battery. In the event of a system-wide power failure, the emergency quick-open function continues to operate normally, relying on the internal oil pressure of the accumulator and the power supply from the controller, ensuring high reliability of the steam regulating device in emergency situations.

[0069] As can be seen, this application, during transient characteristic tests of steam turbine generator sets, utilizes a steam regulating device to rapidly and accurately control the steam flow rate discharged from the steam branch pipes, maintain stable steam header pressure, and ensure unit safety and smooth test operation. The application of a storage-type electro-hydraulic actuator ensures fast valve action time and high valve position control accuracy; eliminates the risk of overheating failure, and maintains the valve position even after power failure; reduces the configuration cost of the power unit and extends its service life; features pressure-locked interlock protection, rapidly opens the valve to relieve pressure in case of steam overpressure; and retains an emergency rapid opening function even during a system-wide power outage, ensuring high reliability in emergency response. This steam regulating device boasts low configuration cost, rapid and accurate regulation, and high safety and reliability.

[0070] This application also provides a steam regulation method based on a storage-type electro-hydraulic actuator for a steam regulation device. For specific implementation details, please refer to the specific implementation section of the device. Repeated details will not be elaborated further. Figure 4 As shown, the method includes: Step 401: In response to the load adjustment value input by the user, generate the target valve position of the steam regulating valve based on the load adjustment value, and respond to the load change command triggered by the user.

[0071] Step 402: In response to the target valve position, generate a first adjustment command instructing the steam regulating valve to adjust to the target valve position.

[0072] Step 403: Based on the first adjustment command, control the steam regulating valve to adjust to the target valve position so as to discharge the target steam flow from the steam main pipe through the steam branch pipe, or to make the target steam flow compensate and flow back from the steam branch pipe to the steam main pipe.

[0073] The target steam flow rate is the change in the steam flow rate required by the turbine generator set before and after the load change.

[0074] The final steam flow in the steam header enters the turbine generator set, and the final steam flow is matched with the current load, which is the load obtained after executing the load change command.

[0075] The above process was conducted in experimental mode.

[0076] In one specific embodiment, such as Figure 5 As shown, the specific implementation in the interlocking mode includes: Step 501: Monitor the status of each steam pressure switch.

[0077] Step 502: Determine in real time whether at least two steam pressure switches have performed pressure switch actions within the first preset time period, and whether the pressure switch actions are maintained for the second preset time period. If both are yes, proceed to step 503; otherwise, proceed to step 501.

[0078] Step 503: Generate a second adjustment command to instruct the steam regulating valve to be adjusted to a preset valve position.

[0079] In one specific embodiment, such as Figure 6 As shown, the specific implementation of the emergency valve opening includes: Step 601: Respond to the emergency operation button activated by the user.

[0080] Step 602: Generate a third adjustment command to instruct the steam regulating valve to be adjusted to the fully open state.

[0081] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0082] Finally, it should be noted that the above descriptions are merely preferred embodiments of this application, and this application is not limited to the above embodiments. It is understood that other improvements and variations directly derived or conceived by those skilled in the art without departing from the spirit and concept of this application should be considered to be included within the protection scope of this application.

Claims

1. A steam regulating device based on an energy storage electro-hydraulic actuator, characterized in that, The device includes: an energy storage electro-hydraulic actuator, a steam regulating valve, a PLC controller, a monitoring platform, a steam main pipe, and steam branch pipes; The energy storage electro-hydraulic actuator is connected to the steam regulating valve, the steam regulating valve is connected to the steam main pipe through the steam branch pipe, the steam main pipe is connected to the steam turbine generator set, and the monitoring platform is connected to the PLC controller and the energy storage electro-hydraulic actuator respectively. The PLC controller is connected to the energy storage electro-hydraulic actuator. The monitoring platform is used to respond to the load adjustment value input by the user, generate the target valve position of the steam regulating valve based on the load adjustment value, and transmit the target valve position to the PLC controller; and when responding to the load change command triggered by the user, it synchronously sends the load change command to the PLC controller and the load control switch, wherein the load control switch is used to control the increase or decrease of the load; The PLC controller is used to respond to the target valve position transmitted by the monitoring platform, generate a first adjustment command to instruct the steam regulating valve to adjust to the target valve position, and send the first adjustment command to the energy storage electro-hydraulic actuator when the load change command is received. The energy storage electro-hydraulic actuator is used to control the steam regulating valve to adjust to the target valve position based on the first adjustment command when receiving the first adjustment command, so as to discharge the target steam flow from the steam header through the steam branch pipe, or to make the target steam flow compensated and returned from the steam branch pipe to the steam header, wherein the target steam flow is the change in the steam flow required by the steam turbine generator set before and after the load change; The final steam flow rate in the steam header enters the steam turbine generator set, and the final steam flow rate is matched with the current load, which is the load obtained after executing the load change command.

2. The steam regulating device based on an energy storage electro-hydraulic actuator according to claim 1, characterized in that, Load changes include: load increase and load decrease; Specifically, when the load change is an increase, the target flow rate is compensated and returned from the steam branch pipe to the steam main pipe; when the load change is a decrease, the target flow rate is discharged from the steam main pipe through the steam branch pipe.

3. The steam regulating device based on an energy storage electro-hydraulic actuator according to claim 1 or 2, characterized in that, The device also includes: three steam pressure switches; One end of the steam pressure switch is connected to the PLC controller, and the other end of the steam pressure switch is connected to the steam header. The steam pressure switch is used to monitor the steam pressure of the steam header and to perform a pressure switch action when the steam pressure is greater than a preset steam pressure. The pressure switch action includes: changing the pressure switch signal received by the PLC controller from open to closed, and changing the pressure switch signal received by the PLC controller from closed to open. The PLC controller is used to acquire the pressure switch signal generated by the steam pressure switch performing the pressure switch action, and generate a second adjustment command based on the pressure switch signal to instruct the steam regulating valve to adjust to a preset valve position.

4. The steam regulating device based on an energy storage electro-hydraulic actuator according to claim 3, characterized in that, The PLC controller is used to determine in real time, based on the pressure switch signal, whether at least two steam pressure switches have performed pressure switching actions within a first preset time period, and whether the pressure switch actions have been maintained for a second preset time period, when the current operating mode is determined to be interlock mode; if it is determined that at least two steam pressure switches have performed pressure switching actions within the first preset time period, and the pressure switch actions have been maintained for the second preset time period, a second adjustment command is generated to instruct the steam regulating valve to adjust to a preset valve position, and the second adjustment command is sent to the energy storage electro-hydraulic actuator. The energy storage electro-hydraulic actuator is used to control the steam regulating valve to adjust to a preset valve position based on the second adjustment command when a second adjustment command is received.

5. The steam regulating device based on an energy storage electro-hydraulic actuator according to claim 1 or 2, characterized in that, The monitoring platform is used to determine the target steam flow corresponding to the load change command based on a preset first correspondence between the load and the steam flow required by the steam turbine generator set; and to determine the target valve position corresponding to the target steam flow based on a preset second correspondence between the steam flow and the valve position of the steam regulating valve.

6. The steam regulating device based on an energy storage electro-hydraulic actuator according to claim 1 or 2, characterized in that, The monitoring platform includes: a switching knob and an execution button; The switching knob is used to switch between test mode and interlock mode; wherein, when the current operating mode is determined to be test mode, the monitoring platform allows the user to input load adjustment values ​​and responds to load change commands triggered by the user. The execute button is connected to the PLC controller and the load control switch respectively. When the current operating mode is determined to be the test mode, when the user presses the execute button, the monitoring platform synchronously sends the load change instruction to the PLC controller and the load control switch.

7. The steam regulating device based on an energy storage electro-hydraulic actuator according to claim 1 or 2, characterized in that, The monitoring platform also includes: an emergency operation button; The monitoring platform is used to generate a third adjustment command in response to the emergency operation button operated by the user, instructing the steam regulating valve to be adjusted to the fully open state, and to send the third adjustment command to the energy storage electro-hydraulic actuator. The energy storage electro-hydraulic actuator is used to control the steam regulating valve to be adjusted to the fully open state based on the third adjustment command when it receives the third adjustment command.

8. The steam regulating device based on an energy storage electro-hydraulic actuator according to claim 1 or 2, characterized in that, The energy storage electro-hydraulic actuator is used to acquire the actual valve position of the steam regulating valve in real time during the process of adjusting the valve to the target valve position; compare the actual valve position with the target valve position to obtain a comparison result; and control the forward or reverse flow of hydraulic oil based on the comparison result.

9. The steam regulating device based on an energy storage electro-hydraulic actuator according to claim 8, characterized in that, If the comparison result indicates that the deviation between the actual valve position and the target valve position is less than a preset threshold, the flow of hydraulic oil is stopped and the valve position is locked.

10. The steam regulation method based on an energy storage electro-hydraulic actuator of the steam regulation device according to any one of claims 1-9, characterized in that, The method includes: In response to the load adjustment value input by the user, the target valve position of the steam regulating valve is generated based on the load adjustment value, and the load change command triggered by the user is also responded to. In response to the target valve position, a first adjustment command is generated to instruct the steam regulating valve to adjust to the target valve position; Based on the first adjustment command, the steam regulating valve is controlled to adjust to the target valve position so as to discharge the target steam flow from the steam main pipe through the steam branch pipe, or to make the target steam flow compensated and returned to the steam main pipe from the steam branch pipe, wherein the target steam flow is the change in the steam flow required by the steam turbine generator set before and after the load change; The final steam flow rate in the steam header enters the steam turbine generator set, and the final steam flow rate is matched with the current load, which is the load obtained after executing the load change command.

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