System and method for real-time monitoring and optimization of flow characteristics of steam turbine high-pressure regulating valve

Abstract

The present invention provides a system and method for real-time monitoring and optimization of the flow characteristics of a steam turbine high-pressure regulating valve, which belongs to the field of steam turbine valve testing. The system includes: an acquisition module for real-time acquisition of data of the steam turbine high-pressure regulating valve; a conversion module for converting the data of the steam turbine high-pressure regulating valve from analog to digital; a processing module for judging whether the flow characteristics of the high-pressure regulating valve have changed based on the digital data of the steam turbine high-pressure regulating valve; calculating the flow characteristic calculated value based on the data of the steam turbine high-pressure regulating valve, and optimizing the flow characteristic calculated value based on a preset linear reference curve; a control module for testing the high-pressure regulating valve and outputting the measured data of the high-pressure regulating valve. The present invention can be put into long-term operation monitoring of the unit, without the need for periodic testing and optimization in accordance with the specific working conditions of the unit; normal heating and soot blowing of the unit do not affect the monitoring and optimization of the flow characteristics of the steam turbine high-pressure regulating valve, and has strong adaptive capabilities.

Description

Technical Field

[0001] The present invention relates to the field of steam turbine valve testing, and in particular to a system for real-time monitoring and optimization of flow characteristics of a high-pressure regulating valve of a steam turbine and a method for real-time monitoring and optimization of flow characteristics of a high-pressure regulating valve of a steam turbine. Background Art

[0002] The load regulation of the unit AGC and primary frequency regulation requires short response time and high action accuracy. The good linearity of the flow characteristics of the turbine steam inlet regulating valve is the basis for the unit load regulation.

[0003] After the turbine valve has been overhauled or has been running for a long time, the flow characteristics will change to varying degrees. The change in flow characteristics will affect the load regulation performance of the unit and cannot meet the technical requirements of the power grid. Summary of the Invention

[0004] The purpose of the embodiments of the present invention is to provide a system and method for real-time monitoring and optimization of the flow characteristics of a steam turbine high-pressure regulating valve, so as to solve the problem that the flow characteristics of the steam turbine regulating valve cannot be monitored and optimized in time after the flow characteristics change.

[0005] In order to achieve the above object, the present invention provides a system for real-time monitoring and optimization of flow characteristics of a high-pressure regulating valve of a steam turbine, the system comprising: an acquisition module, a conversion module, a control module and a processing module;

[0006] The acquisition module is used to collect data of the high-pressure regulating valve of the steam turbine in real time;

[0007] The conversion module is used to convert the data of the high-pressure regulating valve of the steam turbine collected by the collection module from analog quantity to digital quantity;

[0008] The processing module is used to determine whether the flow characteristic of the high-pressure regulating valve has changed based on the digital data of the high-pressure regulating valve of the steam turbine; calculate the flow characteristic calculated value after the flow characteristic of the high-pressure regulating valve has changed based on the data of the high-pressure regulating valve of the steam turbine; and optimize the flow characteristic calculated value according to a preset linear reference curve;

[0009] The control module is used to test the high-profile door and output the measured data of the high-profile door.

[0010] Preferably, the data of the steam turbine high-pressure regulating valve includes operation data and test data;

[0011] The operating data includes: one or more of steam temperature, steam pressure and valve opening;

[0012] The test data includes one or more of steam temperature, steam pressure and valve opening.

[0013] Preferably, it also includes: a storage module for storing operation data, test data, flow characteristic calculation values and measured data.

[0014] Preferably, it further comprises: a data import / export module, used to export the operating data, test data, flow characteristic calculation values and measured data stored in the storage module or to import new data into the storage module, wherein the new data is the monitoring data of the high-pressure regulating valve of the steam turbine monitored by the DCS system;

[0015] The storage module is also used to store the monitoring data;

[0016] The processing module is further configured to calculate and optimize the flow characteristic calculation value after the flow characteristic of the high-pressure valve changes based on the monitoring data.

[0017] Preferably, it also includes: a display module for displaying operation data, test data, flow characteristic calculation values and measured data.

[0018] Preferably, the control module includes: a judgment unit, a test boundary restriction unit and a test unit;

[0019] The judging unit is used to judge whether the historical travel status data of all high-profile doors are complete according to the operating data;

[0020] The testing unit is used to start testing the high-pressure door when the high-pressure door is fully opened;

[0021] The test boundary limiting unit is used to automatically limit the minimum value and maximum value of the total valve position instruction of the high-pressure regulating valve test link according to the stable operation load range of the steam turbine unit.

[0022] Preferably, the processing module includes: a pre-processing unit, a conversion unit and an optimization unit;

[0023] The pre-processing unit is used to remove deviated data in the running data based on a sampling discrete point elimination algorithm;

[0024] The conversion unit is used to calculate the flow characteristic calculation value based on the pre-processed operating data;

[0025] The optimization unit is used to optimize the flow characteristic calculation value according to a preset linear reference curve.

[0026] The present invention further provides a method for real-time monitoring and optimization of the flow characteristics of a high-pressure regulating valve of a steam turbine, which is implemented using the above-mentioned system for real-time monitoring and optimization of the flow characteristics of a high-pressure regulating valve of a steam turbine. The method comprises:

[0027] Obtaining the operation data or test data of the steam turbine high-pressure regulating valve;

[0028] Determine whether the flow characteristics of the high-pressure valve have changed based on operating data or test data;

[0029] Calculate the flow characteristic value based on the operating data;

[0030] The calculated flow characteristic value is optimized according to the preset linear reference curve.

[0031] Preferably, calculating the flow characteristic value according to the operating data includes:

[0032] Preprocess the running data based on the sampling discrete point elimination algorithm;

[0033] Calculate the relative steam flow of the high-pressure damper based on the pre-processed operating data;

[0034] A flow characteristic curve is drawn according to the relative steam flow rate, and the flow characteristic curve is used to represent the flow characteristic calculation value.

[0035] Preferably, the optimization operation of the flow characteristic calculation value includes: segmented manual adjustment, continuous manual adjustment and automatic setting.

[0036] Through the above technical solution, the present invention has at least the following technical effects:

[0037] 1. The acquisition module of the present invention can collect the operating data of the high-pressure regulating valve of the steam turbine in real time. Therefore, the optimization system of the present invention can be put into long-term operation monitoring of the unit, without the need for periodic testing and optimization under specific unit operating conditions;

[0038] 2. The present invention calculates the flow characteristic calculated value after the flow characteristic of the high-pressure regulating valve changes based on the operating data, and the normal heating and soot blowing of the unit do not affect the monitoring and optimization of the flow characteristic of the high-pressure regulating valve of the turbine, and has strong adaptive ability.

[0039] Other features and advantages of the embodiments of the present invention will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The accompanying drawings are used to provide a further understanding of the embodiments of the present invention and constitute a part of the specification. Together with the following detailed description, they are used to explain the embodiments of the present invention, but do not constitute a limitation of the embodiments of the present invention. In the accompanying drawings:

[0041] Figure 1 This is a block diagram of a system for real-time monitoring and optimization of flow characteristics of a steam turbine high-pressure regulating valve provided by one embodiment of the present invention;

[0042] Figure 2 This is a flow chart of a method for real-time monitoring and optimization of flow characteristics of a high-pressure regulating valve of a steam turbine provided by an optional embodiment of the present invention;

[0043] Figure 3 It is a monitoring and optimization curve diagram provided by an optional embodiment of the present invention. DETAILED DESCRIPTION

[0044] The following describes the specific implementation of the embodiment of the present invention in detail with reference to the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the embodiment of the present invention and is not used to limit the embodiment of the present invention.

[0045] Figure 1 This is a block diagram of a system for real-time monitoring and optimization of flow characteristics of a steam turbine high-pressure regulating valve provided by an embodiment of the present invention, such as Figure 1 As shown, a system for real-time monitoring and optimization of flow characteristics of a high-pressure regulating valve of a steam turbine, the system includes: an acquisition module, a conversion module, a control module and a processing module;

[0046] The acquisition module is used to collect data on the high-pressure valve of the turbine in real time. In this embodiment, the high-pressure valve is a valve used to control the speed and output power of the turbine. The speed and power are controlled by changing the amount of steam entering the turbine. Usually, multiple valves are used to open or close according to the set program to achieve the purpose.

[0047] In this embodiment, the data of the turbine high-speed regulating valve include operating data and test data. The operating data include: steam temperature, steam pressure, regulating valve opening and unit power, etc., and the test data also include: steam temperature, steam pressure, regulating valve opening and unit power, etc.; the operating data is the actual operation data of the turbine high-speed regulating valve, and the test data is the data obtained through the turbine high-speed regulating valve flow characteristic test. It takes a long time to obtain all the full-stroke operating data of the high-speed regulating valve, the amount of stored operating data is large, and the amount of calculation is relatively large; the test data can quickly obtain all the full-stroke data of the regulating valve through experiments as needed, and can quickly judge the changes in the flow characteristics of the high-speed regulating valve.

[0048] The acquisition module integrates thermocouples, transmitters, linear displacement sensors, etc. The thermocouples are mainly used to detect steam temperature, the transmitters are mainly used to detect steam pressure, and the linear displacement sensors are mainly used to detect the valve opening. Since the acquisition module can collect the operating data of the high-pressure valve of the steam turbine in real time, the optimization system of the present invention can be independent of the DCS system and can be used for long-term operation monitoring of the unit without the need for periodic testing and optimization based on the specific operating conditions of the unit.

[0049] The conversion module is used to convert the data of the turbine high-pressure valve collected by the acquisition module from analog to digital. One or more of the steam temperature, steam pressure, unit power and valve opening collected by the acquisition module are usually analog signals. The conversion module is a digital-to-analog converter, which can convert the analog signal into unified digital information, which is convenient for the subsequent processing of the operation data.

[0050] The processing module is used to determine whether the flow characteristics of the high-pressure regulating valve have changed based on the digital data of the turbine high-pressure regulating valve; calculate the flow characteristic calculated value after the flow characteristics of the high-pressure regulating valve have changed based on the data of the turbine high-pressure regulating valve; and optimize the flow characteristic calculated value according to a preset linear reference curve.

[0051] The control module is used to test the high-pressure valve and output the measured data of the high-pressure valve. In this embodiment, when all high-pressure valves are in the fully open state, the actual flow characteristics of the high-pressure valve are tested according to the process of fully open-fully closed-fully open to obtain measured data. The measured data can reflect the actual operation of the high-pressure valve, and the measured data can also be used to verify the accuracy of the calculated value of the flow characteristic.

[0052] As a further optimization of this embodiment, the control module includes: a judgment unit, a test boundary restriction unit and a test unit;

[0053] The judging unit is used to judge whether the historical travel status data of all high-profile doors are complete according to the operating data;

[0054] The testing unit is used to start testing the high-pressure door when the high-pressure door is fully opened;

[0055] The test boundary limiting unit is used to automatically limit the minimum value and maximum value of the total valve position instruction of the high-pressure regulating valve test link according to the stable operation load range of the steam turbine unit.

[0056] During the test, first determine whether all high-pressure regulating valves are in the fully open state. The degree of the regulating valve opening can be used to determine whether the high-pressure regulating valves are in the fully open state. When all high-pressure regulating valves are in the fully open state, each high-pressure regulating valve is tested according to the test instructions generated by the test unit (the test instructions generated by the test unit are converted by the conversion module, and the digital test instructions are converted into analog test instructions. The analog test instructions are then output by the acquisition module, and the high-pressure regulating valve performs the switching action according to the test instructions). For example, the steam turbine unit has four high-pressure regulating valves (CV1, CV2, CV3, CV4), the four high-pressure regulating valves are tested in sequence. The first high-pressure regulating valve is tested from fully open to fully closed, and then from fully closed to fully open. After the first high-pressure regulating valve test is completed, the second high-pressure regulating valve test is started. When all high-pressure regulating valves are tested, the minimum and maximum values of the total valve position command of the high-pressure regulating valve test link are limited in the stable operating load range of the steam turbine unit, and single valve test and sequence valve test are carried out. After the test is completed, the measured data are obtained, and the measured curve can be generated based on the measured data. The measured curve can reflect the actual operation of the high-pressure regulating valve; Figure 3As shown, CV1 old and CV1 new represent the flow characteristic curves of the first valve before and after optimization respectively. The horizontal axis of the flow characteristic curves of CV1 to CV4 is the flow command, and the vertical axis is the throttle opening.

[0057] As a further optimization of this embodiment, the processing module includes: a preprocessing unit, a conversion unit and an optimization unit;

[0058] The pre-processing unit removes the deviated data in the running data by using a sampling discrete point elimination algorithm;

[0059] In this embodiment, the processing module can generate high-pressure valve opening instructions corresponding to different flow instructions, that is, valve adjustment instructions.

[0060] In this embodiment, 30 or 40 equidistant reference points are selected within the range of the valve instruction (0% to 100%) by the processing module, and a flow instruction corresponds to a valve opening of the high-pressure valve. At this valve opening, the high-pressure valve has a corresponding steam flow; and before the flow characteristic of the high-pressure valve changes, the corresponding steam flow of the high-pressure valve will be different at this valve opening; therefore, after the flow characteristic changes, the steam flow corresponding to all flow instructions of the high-pressure valve is collected, and a flow instruction and the steam flow corresponding to the flow instruction are used as a test point. All test points near the collected reference point can be subjected to difference, square and square root operations with the reference point, and test points with too large differences are eliminated. The test point with the smallest difference is selected as the valid value. At this time, 30 or 40 test points can be obtained.

[0061] The conversion unit is used to calculate the flow characteristic calculation value based on the pre-processed operating data;

[0062] In this embodiment, when the flow characteristics of the high-pressure regulating valve of the steam turbine change, the relative steam flow of each high-pressure regulating valve is calculated according to the following calculation formula:

[0063]

[0064] Among them, Q is the steam flow rate after the flow rate change, that is, the relative steam flow rate; Q0 is the steam flow rate before the flow rate change, P 01 is the steam pressure of the regulating stage after the flow rate changes, P0 is the steam pressure of the regulating stage before the flow rate changes, P g1 is the exhaust pressure of the high-pressure cylinder after the flow rate changes, P g is the high pressure cylinder exhaust pressure before flow change, T 01is the steam temperature of the regulating stage after the flow change, and T0 is the steam temperature of the regulating stage before the flow change; wherein, the steam flow rate before the flow change is the steam flow rate of the high regulating valve at one of the regulating valve openings; the exhaust pressure of the high-pressure cylinder before the flow change is the exhaust pressure of the high-pressure cylinder at one of the regulating valve openings; the steam pressure of the regulating stage before the flow change is the steam pressure of the regulating stage at one of the regulating valve openings; the steam temperature of the regulating stage before the flow change is the steam temperature of the regulating stage at one of the regulating valve openings.

[0065] Therefore, the present invention can more accurately reflect the actual flow rate passing through the regulating valve by simultaneously introducing the steam pressure and temperature of the regulating stage and the exhaust pressure of the high-pressure cylinder. During the optimization process, there is no need to deliberately maintain the main steam pressure at a certain fixed value, and the soot blowing and heating of the boiler do not affect the accuracy of the measured steam flow rate, thereby reducing many requirements of conventional tests on the operating conditions of the unit and reducing the restrictions of multiple boundary conditions.

[0066] In this embodiment, a flow characteristic curve is drawn with 30 or 40 flow instructions as the horizontal axis and the relative steam flow corresponding to the flow instruction as the vertical axis. The flow characteristic curve can be used to represent the flow characteristic calculation value. The flow characteristic curve is Figure 3 "Flow characteristic curve before optimization".

[0067] The optimization unit is used to optimize the flow characteristic calculation value according to the preset linear reference curve, verify and optimize the flow characteristic calculation value according to the linear reference curve, and judge whether the flow characteristic curve is consistent with the linear reference curve. If there is a local deviation, the flow characteristic calculation value is optimized according to the linear reference curve. The linear reference curve is as follows: Figure 3 As shown in Figure 2, by adjusting the calculated value of the flow characteristic, the linear optimization of the flow characteristic is achieved. The optimized flow characteristic curve is shown in Figure 2. Figure 3 The “optimized flow characteristic curve” is shown.

[0068] In this embodiment, the operations for optimizing the calculated value of the flow characteristic include: segmented manual adjustment, continuous manual adjustment, and automatic adjustment;

[0069] Among them, the segmented manual adjustment is: using the touch screen input method, according to the difference between the flow characteristic curve and the linear reference curve, modify and adjust the segmented function such as Figure 3 The parameter (slope) shown in the figure then drives the flow characteristic curve to be close to the linear reference curve.

[0070] Among them, continuous manual adjustment is: according to the customized mouse wheel scrolling step, the local deviation point of the flow characteristic curve is continuously adjusted, thereby driving the entire flow characteristic curve to be close to the linear reference curve.

[0071] Among them, automatic tuning is: based on the algorithm for eliminating static deviation of the curve, with the set static deviation dead zone as the criterion, the relative flow value of the local deviation point is automatically adjusted, so that the flow characteristic curve is closely fitted with the linear reference curve.

[0072] As a further optimization of this embodiment, the system further includes a storage module for storing operating data, test data, calculated flow characteristic values, and measured data, and the storage module is further configured to store the monitoring data; the processing module is further configured to optimize the calculated flow characteristic value after changes in the flow characteristic of the high-pressure regulating valve based on the monitoring data. The storage module utilizes a memory to store data such as steam temperature, steam pressure, unit power, regulating valve opening, and flow instructions.

[0073] As a further optimization of this embodiment, the system also includes: a data import / export module, which is used to export the operating data, test data, flow characteristic calculation values and measured data stored in the storage module or import new data into the storage module, wherein the new data is the monitoring data of the turbine high-pressure valve monitored by the DCS system, and the storage module is also used to store the monitoring data; the processing module is also used to optimize the flow characteristic calculation value after the flow characteristic of the high-pressure valve changes according to the monitoring data.

[0074] In this embodiment, the new data can be exported from the DCS history via a CD, and then the new data in the CD is imported into the storage module of this system. The new data is equivalent to the digital operation data output by the conversion module, which can avoid the situation where the acquisition module cannot perform data acquisition due to on-site reasons. The system can still normally obtain the operation data of the high-profile door.

[0075] In this embodiment, once the memory is full of data, the device will inevitably operate abnormally or shut down. To ensure the long-term operation of the system, the system adopts a cyclic data acquisition mode and sets time segment and event segment modes for the cyclic acquisition mode. The time segment mode allows users to select any time length as a separately stored data packet through the function options set in the system menu for offline analysis or data export. The event segment, that is, during the data acquisition process, adds a pre-set determination of the required data for each effective stroke segment of each valve, and for all allowable stroke segments of a single valve or sequence valve. When the data acquisition is determined to be complete, the data is recorded and saved as a separately stored data packet at this moment for offline analysis or data export. To ensure data validity as much as possible, a unit power curve determination function is added. When the unit remains stable at a certain load for a long time, the data processing module automatically deletes duplicate segments of data.

[0076] As a further optimization of this embodiment, the system also includes: a display module for displaying operating data, test data, flow characteristic calculation values and measured data; in this embodiment, the display module can use a touch screen display, and the operating data, test data, flow characteristic calculation values and measured data can be viewed on the touch screen display.

[0077] Figure 2 This is a flow chart of a method for real-time monitoring and optimization of flow characteristics of a high-pressure regulating valve of a steam turbine provided by an optional embodiment of the present invention, such as Figure 2 As shown, an embodiment of the present invention further provides a method for real-time monitoring and optimization of the flow characteristics of a high-pressure regulating valve of a steam turbine, which is implemented using the above-mentioned system for real-time monitoring and optimization of the flow characteristics of a high-pressure regulating valve of a steam turbine. The method includes:

[0078] Step S101: Acquire operation data or test data of the steam turbine high-pressure regulating valve.

[0079] In this embodiment, the test data is data obtained through a flow characteristic test of a high-pressure regulating valve of a steam turbine. The operating data can be obtained in the following two ways: first, the acquisition module acquires data such as the steam temperature, steam pressure, regulating valve opening, and steam flow of the high-pressure regulating valve of the steam turbine as operating data; the operating data is subjected to digital-to-analog conversion processing by the conversion module, and the obtained digital operating data is used as the input value of the subsequent calculation step; second, the data such as the steam temperature, steam pressure, steam flow, and regulating valve opening of the high-pressure regulating valve of the steam turbine monitored in the DCS system are recorded into a CD, and then the recorded data in the CD are imported into the optimization system through the data import / export module, and the imported data are equivalent to the operating data collected by the acquisition module.

[0080] Step S102: Determine whether the flow characteristics of the high-pressure valve have changed based on the operating data or test data. In this embodiment, the operating or test data is used to determine whether the flow characteristics of the high-pressure valve have changed. When the flow characteristics of the high-pressure valve have changed, the test data will deviate from the Figure 3 The linear reference curve in .

[0081] Step S103: After obtaining the operation or test data, the flow characteristic calculation value is calculated based on the operation or test data:

[0082] Specifically, the flow characteristic calculation value is calculated based on the operation or test data, including:

[0083] Step b01: pre-processing the running or test data based on the sampling discrete point elimination algorithm;

[0084] In this embodiment, the processing module can generate a tuning instruction for the high-frequency gate. The tuning instruction is converted from digital to analog by the conversion module, converting the digital tuning instruction into an analog tuning instruction. The analog tuning instruction is then output by the acquisition module, and the high-frequency gate is opened or closed according to the tuning instruction.

[0085] In this embodiment, 30 or 40 equidistant reference points are selected within the range of the valve instruction (0% to 100%) by the processing module, and a flow instruction corresponds to a valve opening of the high-pressure valve. At this valve opening, the high-pressure valve has a corresponding steam flow; and before the flow characteristic of the high-pressure valve changes, the corresponding steam flow of the high-pressure valve will be different at this valve opening; therefore, after the flow characteristic changes, the steam flow corresponding to all flow instructions of the high-pressure valve is collected, and a flow instruction and the steam flow corresponding to the flow instruction are used as a test point. All test points near the collected reference point can be subjected to difference, square and square root operations with the reference point, and test points with too large differences are eliminated. The test point with the smallest difference is selected as the valid value. At this time, 30 or 40 test points can be obtained.

[0086] Step b02: Calculating the relative steam flow rate of the high-pressure damper based on the pre-processed operation or test data;

[0087] In this embodiment, when the flow characteristics of the high-pressure regulating valve of the steam turbine change, the relative steam flow of each high-pressure regulating valve is calculated according to the following calculation formula:

[0088]

[0089] Among them, Q is the steam flow rate after the flow rate change, that is, the relative steam flow rate; Q0 is the steam flow rate before the flow rate change, P 01 is the steam pressure of the regulating stage after the flow rate changes, P0 is the steam pressure of the regulating stage before the flow rate changes, P g1 is the exhaust pressure of the high-pressure cylinder after the flow rate changes, P g is the high pressure cylinder exhaust pressure before flow change, T 01 is the steam temperature of the regulating stage after the flow change, and T0 is the steam temperature of the regulating stage before the flow change; wherein, the steam flow rate before the flow change is the steam flow rate of the high regulating valve at one of the regulating valve openings; the exhaust pressure of the high-pressure cylinder before the flow change is the exhaust pressure of the high-pressure cylinder at one of the regulating valve openings; the steam pressure of the regulating stage before the flow change is the steam pressure of the regulating stage at one of the regulating valve openings; the steam temperature of the regulating stage before the flow change is the steam temperature of the regulating stage at one of the regulating valve openings.

[0090] Step b03: Draw a flow characteristic curve according to the relative steam flow rate, wherein the flow characteristic curve is used to represent the flow characteristic calculation value.

[0091] In this embodiment, a flow characteristic curve is drawn with 30 or 40 flow instructions as the horizontal axis and the relative steam flow corresponding to the flow instructions as the vertical axis. The flow characteristic curve can be used to represent the flow characteristic calculation value.

[0092] Step S104: Correcting the flow characteristic calculation value according to a preset linear reference curve.

[0093] In this embodiment, the correction operations for the flow characteristic calculation value include: segmented manual adjustment, continuous manual adjustment and automatic adjustment;

[0094] Among them, the segmented manual adjustment is: using the touch screen input method, according to the difference between the flow characteristic curve and the linear reference curve, modify and adjust the segmented function such as Figure 3 The parameter (slope) shown in the figure then drives the flow characteristic curve to be close to the linear reference curve.

[0095] Among them, continuous manual adjustment is: continuously adjusting the local deviation point of the flow characteristic curve according to the customized mouse wheel scrolling step, thereby driving the entire flow characteristic curve to be close to the linear reference curve.

[0096] Among them, automatic tuning is: based on the algorithm for eliminating static deviation of the curve, with the set static deviation dead zone as the criterion, the relative flow value of the local deviation point is automatically adjusted, so that the flow characteristic curve is closely fitted with the linear reference curve.

[0097] As a further optimization of this embodiment, the method further includes: testing the high-profile door, including:

[0098] Step a01: First determine whether all high-tone doors are in the fully open state. When all high-tone doors are in the fully open state, test each high-tone door according to the test instructions generated by the test unit (the test instructions generated by the test unit are converted by the conversion module, and the digital test instructions are converted into analog test instructions. The analog test instructions are then output by the acquisition module, and the high-tone door performs the switching action according to the test instructions). Each high-tone door is tested from fully open to fully closed and then from fully closed to fully open.

[0099] For example, a steam turbine unit has four high-speed regulating valves, which are tested in sequence. The first high-speed regulating valve is tested from fully open to fully closed, and then from fully closed to fully open. After the test of the first high-speed regulating valve is completed, the test of the second high-speed regulating valve is started.

[0100] Step a02: After the above tests are completed, the minimum and maximum values of the total valve position instructions of the high-pressure regulating valve test link are limited in the stable operating load range of the steam turbine unit, and single valve tests and sequential valve tests are carried out. The single valve test is to test all valves synchronously from fully closed to fully open, and the sequential valve test is to test from closed to open according to the opening sequence set by the valves. After the single valve test and sequential valve test of the high-pressure regulating valve are completed, the measured data are obtained, and a measured curve can be generated based on the test data. The measured curve can reflect the actual flow characteristic operation of the high-pressure regulating valve.

[0101] The acquisition module of the present invention can collect the operating data of the high-pressure regulating valve of the steam turbine in real time. Therefore, the optimization system of the present invention can be put into long-term operation monitoring of the unit without the need for specific operating conditions of the unit to carry out periodic testing and optimization; secondly, the present invention calculates the flow characteristic calculated value after the flow characteristic of the high-pressure regulating valve changes based on the operating data, and the normal heating and soot blowing of the unit do not affect the flow characteristic monitoring and optimization of the high-pressure regulating valve of the steam turbine, and has strong adaptability.

[0102] Those skilled in the art will appreciate that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application can adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0103] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the steps in the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0104] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0105] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0106] In a typical configuration, a computing device includes one or more processors (CPUs), input / output interfaces, network interfaces, and memory.

[0107] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

[0108] Computer-readable media includes permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. The information can be computer-readable instructions, data structures, program modules or other data. Examples of computer storage media 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 disc (DVD) or other optical storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer-readable media does not include transitory computer-readable media (transitory media), such as modulated data signals and carrier waves.

[0109] It should also be noted that the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, commodity, or apparatus that includes a series of elements includes not only those elements but also other elements not explicitly listed, or includes elements inherent to such process, method, commodity, or apparatus. In the absence of further limitations, an element defined by the phrase "comprises a ..." does not exclude the presence of other identical elements in the process, method, commodity, or apparatus that includes the element.

[0110] The above are merely embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application should all be included within the scope of the claims of the present application.

Claims

1. A method for real-time monitoring and optimization of the flow characteristics of a steam turbine high-pressure regulating valve is implemented using a system for real-time monitoring and optimization of the flow characteristics of a steam turbine high-pressure regulating valve. The system for real-time monitoring and optimization of the flow characteristics of a steam turbine high-pressure regulating valve comprises: Acquisition module, conversion module, control module and processing module; The acquisition module is used to collect data of the high-pressure regulating valve of the steam turbine in real time; The conversion module is used to convert the data of the high-pressure regulating valve of the steam turbine collected by the collection module from analog to digital; the processing module is used to determine whether the flow characteristic of the high-pressure regulating valve has changed based on the digital data of the high-pressure regulating valve of the steam turbine; calculate the flow characteristic calculated value after the flow characteristic of the high-pressure regulating valve has changed based on the data of the high-pressure regulating valve of the steam turbine, and optimize the flow characteristic calculated value based on a preset linear reference curve; the control module is used to test the high-pressure regulating valve and output the measured data of the high-pressure regulating valve, characterized in that the method includes: Obtaining operation data or test data of the high-pressure regulating valve of the steam turbine; wherein the operation data includes: steam flow rate of the high-pressure regulating valve before flow change, steam pressure of the regulating stage after flow change, steam pressure of the regulating stage before flow change, high-pressure cylinder exhaust pressure after flow change, high-pressure cylinder exhaust pressure before flow change, steam temperature of the regulating stage after flow change, and steam temperature of the regulating stage before flow change; Determine whether the flow characteristics of the high-pressure valve have changed based on operating data or test data; Calculate flow characteristic values based on operating or test data; Optimize the calculated flow characteristic value according to the preset linear reference curve; Calculates flow characteristics based on operating data, including: Preprocess the running data based on the sampling discrete point elimination algorithm; Calculate the relative steam flow of the high-pressure damper based on the pre-processed operating data; Drawing a flow characteristic curve according to the relative steam flow rate, wherein the flow characteristic curve is used to represent the flow characteristic calculation value; Calculate the relative steam flow of the HVAC valve based on the pre-processed operating data, including: Based on the steam flow of the high-pressure regulating valve before the flow change, the steam pressure of the regulating stage after the flow change, the steam pressure of the regulating stage before the flow change, the high-pressure cylinder exhaust pressure after the flow change, the high-pressure cylinder exhaust pressure before the flow change, the steam temperature of the regulating stage after the flow change, and the steam temperature of the regulating stage before the flow change, the relative steam flow of the high-pressure regulating valve is determined by the following formula; ;in, is the relative steam flow rate of the high-pressure damper; is the steam flow of the high-pressure valve before the flow change, is the steam pressure of the regulating stage after the flow rate changes, is the steam pressure of the regulating stage before the flow rate changes, is the exhaust pressure of the high-pressure cylinder after the flow rate changes, is the high pressure cylinder exhaust pressure before the flow rate changes, is the steam temperature of the regulating stage after the flow rate changes, is the steam temperature of the regulating stage before the flow rate changes.

2. The method according to claim 1, characterized in that The correction operations for the calculated flow characteristic values include: segmented manual adjustment, continuous manual adjustment and automatic adjustment.

3. The method according to claim 1, characterized in that The system for real-time monitoring and optimization of flow characteristics of a steam turbine high-pressure regulating valve also includes: a storage module for storing operating data, test data, flow characteristic calculation values and measured data.

4. The method according to claim 1, wherein The system for real-time monitoring and optimization of the flow characteristics of the steam turbine high-pressure regulating valve further includes: a data import / export module for exporting the operating data, test data, flow characteristic calculation values and measured data stored in the storage module or importing new data into the storage module, wherein the new data is the monitoring data of the steam turbine high-pressure regulating valve monitored by the DCS system; The storage module is also used to store the monitoring data; The processing module is further configured to optimize the flow characteristic calculation value after the flow characteristic of the high-pressure valve changes according to the monitoring data.

5. The method according to claim 1, wherein The system for real-time monitoring and optimization of the flow characteristics of the steam turbine high-pressure regulating valve also includes: a display module for displaying operating data, test data, flow characteristic calculation values and measured data.

6. The method according to claim 1, characterized in that The control module includes: a judgment unit, a test boundary restriction unit and a test unit; The judgment unit is used to judge the historical travel status of all high-profile doors based on the operating data; The testing unit is used to start testing the high-pressure door when the high-pressure door is fully opened; The test boundary limiting unit is used to automatically limit the minimum value and maximum value of the total valve position instruction of the high-pressure regulating valve test link according to the stable operation load range of the steam turbine unit.

7. The method according to claim 1, characterized in that The processing module includes: a pre-processing unit, a conversion unit and an optimization unit; The pre-processing unit is used to remove deviated data in the running data based on a sampling discrete point elimination algorithm; The conversion unit is used to calculate the flow characteristic calculation value based on the pre-processed operating data; The optimization unit is used to optimize the flow characteristic calculation value according to a preset linear reference curve.

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