A method for on-line activity test of a steam extraction check valve

Abstract

This invention discloses an online active testing method for extraction steam check valves, belonging to the field of check valves. It addresses the problems of current thermal power plant extraction steam check valve configurations lacking testing devices or requiring manual testing. Without testing devices, the solenoid valve operation for controlling the extraction steam check valve causes significant disturbance to the thermal system; and manual testing devices require numerous preconditions for active testing. The method is as follows: Establishing the online active testing logic for the check valve: This logic needs to be established during unit shutdown. An online active testing initiation button is set, and a valve closing time is added. Based on the results of each process (valve closing and opening) within a specified time, the final conclusion of the online active testing process is determined. An online active testing operation panel is added. The action time of the extraction steam check valve is tested. This invention realizes the online active testing function, allowing the test to be completed remotely with a single click on the screen. The progress and results of the test are automatically judged and displayed.

Description

Technical Field

[0001] This invention belongs to the field of extraction steam check valves and relates to active testing technology, specifically an online active testing method for extraction steam check valves. Background Technology

[0002] A check valve is a valve that automatically opens and closes its disc based on the flow of the medium itself to prevent backflow. It is also known as a one-way valve, backflow valve, or back pressure valve. Check valves are a type of automatic valve, primarily used to prevent backflow, reverse pump and motor operation, and the release of media from containers. Check valves can also be used in pipelines supplying auxiliary systems where the pressure may rise above the system pressure. Check valves are mainly classified into swing check valves (rotating around the center of gravity) and lift check valves (moving along the axis). The extraction steam check valve is a type of check valve that automatically closes when steam and / or water flow back from the extraction pipe to the turbine body.

[0003] Currently, most thermal power plants' extraction steam check valves are configured without testing devices or with manual testing devices. Without testing devices, the operation of the solenoid valve controlling the extraction steam check valve is required, which causes significant disturbance to the thermal system and poses a high safety risk. Testing can only be conducted before the planned shutdown and sliding stop of the unit. Manual testing devices have many prerequisites for conducting active testing, such as load requirements and proper functioning of relevant automatic controls. Furthermore, the testing process demands high skill from operators, requiring them to be proficient, fast, accurate, and stable. Operators must also be present on-site, and due to the confined space and proximity to the extraction steam check valve, there are personal safety risks. Therefore, we propose an online active testing method for extraction steam check valves. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the purpose of this invention is to provide an online active testing method for extraction steam check valves.

[0005] The technical problem to be solved by this invention is:

[0006] How to change the current situation where thermal power plants' steam extraction check valves have no testing device or are manually tested, so as to set up an online active testing device for the steam extraction check valves in thermal power plants.

[0007] The objective of this invention can be achieved through the following technical solutions:

[0008] A method for online operation testing of a steam extraction check valve, the specific method is as follows:

[0009] Step S100: Establish the online active test logic for the check valve;

[0010] Step S200: Add an online activity test operation panel;

[0011] Step S300: Test the operating time of the steam extraction check valve.

[0012] Furthermore, in step S100, when the unit is operating normally and the extraction steam check valve is fully open, the original solenoid valve is controlled by an RS trigger. The button is kept energized when clicked. In case of manual closing or unit malfunction, the solenoid valve is de-energized, and the extraction steam check valve is closed under the push of pipeline steam.

[0013] The logic for the online activity test of the check valve needs to be built during unit shutdown. The logic for the online activity test of the check valve is built on the basis of the original logic, setting an online activity test start button, adding the valve just-closing time, outputting control solenoid valve, and conducting online activity test of the extraction steam check valve. Based on the results of each process of valve closing and opening within the specified time, the final conclusion of the online activity process is determined.

[0014] Furthermore, in step S200, the operation panel for the online activity test is connected. The operation panel serves as the button to start the online activity test, determines the final conclusion of the online activity process, and displays it as a report in a pop-up font.

[0015] Further, in step S300, during normal operation, the energizing time pulse of the extraction steam check valve control solenoid valve starts from 0 seconds and gradually increases with a gradient of 0.1 seconds until the valve just actuates. The effective time t1 is recorded. After increasing the margin by 0.2 seconds, the sufficient time T1 is recorded.

[0016] Record the effective time t2 for the entire process from the de-energization of the solenoid valve to its energization and the return of the extraction steam check valve to its initial state. After increasing the margin by 0.2 seconds, record the sufficient time T2.

[0017] Furthermore, the operating steps of the control panel in the online activity trial are as follows:

[0018] Open the operation panel and click the "Start Experiment" button in the operation panel to start the experiment;

[0019] The solenoid valve loses power, and the extraction steam check valve closes.

[0020] When the test time ends, the solenoid valve is energized, and the steam extraction check valve opens.

[0021] If the valve does not disappear from the open state within the valve's closing time T1, meaning the valve does not move, it is judged as a valve closing failure, and the red text "valve closing failure" will pop up on the control panel.

[0022] If the valve is not in the open state within the total valve action time T2, i.e. the valve is not reset, it is judged as valve opening failure, and the red text "valve opening failure" will pop up on the operation panel.

[0023] If the check valve open status signal changes from 1 to 0 and then back to 1 within the total test time T3 of the valve activity test, it is considered a successful test, and the green text "valve opened successfully" will pop up on the operation panel.

[0024] Furthermore, the online operation test method for the extraction steam check valve also includes:

[0025] The valve online active test input button module is used to connect to the test start button. Clicking the button will start the active test.

[0026] The valve just closes time pulse module is used to control the time when the solenoid valve is de-energized, and after adding a margin of 0.2 seconds, the sufficient time T1 is recorded;

[0027] The total valve action time pulse module is used to record the effective time t2 for the entire process from the de-energization of the solenoid valve to its energization and the return of the extraction steam check valve to its initial state. After adding a margin of 0.2 seconds, the sufficient time T2 is recorded.

[0028] The total time pulse module for valve online activity testing is used to add 1-5 seconds to the full time T2 of the valve action process;

[0029] The valve online activity test end reset module is used to reset the cumulative number of valve state changes to zero when the total valve time ends.

[0030] The valve open state change capture module is used to input a MEAS value, which is the open position signal. The MEAS value changes from 1 to 0 or from 0 to 1.

[0031] During the valve online activity test, within T2, the valve state change capture is effective, and the input parameter MEAS value connected to the valve open state change count accumulation module is output;

[0032] The valve open state change count accumulation module is used to input the parameter MEAS to connect to the output of the valve state change capture valid value, and the parameter CLEAR is connected to the output of the valve activity test end clearing module. The online activity test ends and the output OUT of the valve open state change count accumulation module is connected to the downstream online activity test success or failure criterion pre-module.

[0033] The online activity experiment success or failure criterion pre-module receives the output of the online activity experiment success or failure criterion pre-module from the input parameter RI01 and compares it with the preset number of times. If the cumulative number of changes is equal to 0, then output BO01; if the cumulative number of changes is equal to 1, then output BO02; if the cumulative number of changes is equal to 2, then output BO03.

[0034] The valve closing failure time delay module has a delay time that is consistent with the valve closing time T1.

[0035] The valve closing failure judgment module outputs BO01 and M012 of the online activity test success or failure criterion pre-module. If the valve open state does not disappear within time T1, that is, the valve does not move, it is judged as valve closing failure, and the red text "valve closing failure" will pop up on the operation panel.

[0036] The valve opening failure time delay module has a delay time that is consistent with the total valve action time T2.

[0037] The valve opening failure judgment module outputs BO02 from the online activity test success or failure criterion pre-module and the valve opening failure time delay module. If the valve is not in the open state within T2 time, that is, the valve is not reset, it is judged as valve opening failure, and the red text "valve opening failure" will pop up on the operation panel.

[0038] The test success judgment module, within the specified time T3 of the valve activity test, ANDs the output BO03 of the upstream online activity test success / failure judgment module with 1, and judges the online activity test as successful, and pops up a green success message on the screen.

[0039] Compared with the prior art, the beneficial effects of the present invention are:

[0040] This invention enables online activity testing without adding or changing field equipment or writing control logic. The test can be completed remotely with a single click on the screen, and the progress and results of the test are automatically judged and displayed. Attached Figure Description

[0041] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0042] Figure 1 This is a flowchart of the process of the present invention;

[0043] Figure 2 This is a schematic diagram of the online activity test operation panel in this invention;

[0044] Figure 3 This is a logic diagram of the present invention. Detailed Implementation

[0045] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0046] In one embodiment, please refer to Figure 1 As shown, an online active test method for extraction steam check valve is proposed, and the specific process or steps are as follows:

[0047] Step S100: Establish the online active test logic for the check valve;

[0048] In step S100, for safety reasons, the setup and installation of the online activity test logic for the check valve need to be carried out during unit shutdown.

[0049] When the unit is running normally and the extraction steam check valve is fully open, the original solenoid valve is controlled by an RS trigger. Clicking the button keeps it constantly energized. In case of manual closing or unit malfunction, the interlock de-energizes the solenoid valve, and the extraction steam check valve closes under the push of the pipeline steam.

[0050] The online activity test logic for the check valve is built upon the existing logic. An initiation button for the online activity test is added, and the valve's closing time is increased. Compared to the original logic output, the output controls the solenoid valve to perform the online activity test of the extraction steam check valve. Based on the results of each valve closing and opening process within the specified time, the online activity progress and final conclusion are determined.

[0051] Step S200: Add an online activity test operation panel;

[0052] In step S200, a test start button is created from the steam extraction heating flow chart screen and connected to the operation panel of the online activity test. The operable part of the operation panel is the button to start the online activity test, to judge the progress of the online activity and the final conclusion, and to display the report in a pop-up font.

[0053] Step S300: Test the operating time of the steam extraction check valve;

[0054] In step S300, to ensure the safety and undisturbed operation of the thermal system, during normal operation, the energizing time pulse of the extraction steam check valve control solenoid valve starts from 0 seconds and gradually increases in increments of 0.1 seconds until the valve just actuates (from fully open to disappearing from the open state). The effective time t1 is recorded. After adding a margin of 0.2 seconds, the sufficient time T1 is recorded. From the time the solenoid valve is de-energized to the time it is energized again, and the extraction steam check valve returns to its initial state (fully open), the effective time t2 is recorded. After adding a margin of 0.2 seconds, the sufficient time T2 is recorded.

[0055] In embodiments of the present invention, such as Figure 2 The image shows the operation panel for the online activity test of this invention, combined with... Figure 2 Step S200 is described in detail:

[0056] In the thermal system monitoring flowchart, open the operation panel and click the start button for the active test in the operation panel to start the test;

[0057] The solenoid valve loses power, and the extraction steam check valve closes.

[0058] When the test time ends, the solenoid valve is energized, and the steam extraction check valve opens.

[0059] If the valve does not disappear from the open state within the valve's closing time T1, meaning the valve does not move, it is judged as a valve closing failure, and the red text "valve closing failure" will pop up on the control panel.

[0060] If the valve is not in the open state within the total valve action time T2, i.e. the valve is not reset, it is judged as valve opening failure, and the red text "valve opening failure" will pop up on the operation panel.

[0061] If the check valve open status signal changes from 1 to 0 and then back to 1 within the total test time T3 of the valve activity test, the test is considered successful, and the green text "Success" will pop up on the operation panel.

[0062] In an embodiment of the present invention, Figure 3 This is a logic diagram of the present invention. The functions of each module in the present invention will be explained in conjunction with the logic diagram:

[0063] Because the online activity test and normal valve opening and closing control the same solenoid valve. During normal operation, the solenoid valve needs to be energized, and the original logic output is 1. Therefore, it is ANDed with the original logic output to control the same solenoid valve.

[0064] M001 is the button module for starting the online valve test. It is connected to the test start button on the screen. Clicking it will start the test.

[0065] M002-B1 is a valve-closing timing pulse module that controls the time it takes for the solenoid valve to be de-energized. After adding a margin of 0.2 seconds, the sufficient time T1 is recorded.

[0066] M003-B1 is the inverting module.

[0067] M004-B1 is a module for controlling the power supply and de-energization of the solenoid valve.

[0068] The online activity test start button M001 outputs a start action time pulse module M002-B1, an inverted module M003-B1, and the original logic output ANDed with M003-B1 to control the solenoid valve and perform an online activity test of the extraction steam check valve.

[0069] M005-B1 is the total valve action time pulse module, which records the effective time t2 of the entire process from the solenoid valve being de-energized to the solenoid valve being energized, and the extraction steam check valve returning to its initial state (fully open). After adding a margin of 0.2 seconds, the sufficient time T2 is recorded.

[0070] M006-B1 is a total time pulse module for valve online activity testing. It adds 1-5 seconds (determined based on valve diameter, pipeline medium pressure, control gas pressure, and cylinder work capacity) to the full time T2 of the valve operation process to ensure that the online activity test results are fully displayed on the operation panel.

[0071] M007-B1 is a valve online activity test end reset module, which resets the cumulative number of valve state changes to zero when the total valve time ends.

[0072] M008 is a valve open / closed state change capture module. The module input MEAS value is the open-to-close signal. The rate change threshold ROCLIM is 0.5. When the MEAS value changes from 1 to 0 or from 0 to 1, the alarm ROCIND output is 1.

[0073] M009-B1 is an AND module. Valve state change capture is only effective during the valve online activity test (T2), and the output is the MEAS value, an input parameter connected to the downstream valve open / close state change count accumulation module.

[0074] M010 is the valve open / closed state change count accumulation module. The input parameter MEAS connects to the output of the valve state change capture valid value M009-B1. The parameter CLEAR connects to the output of the valve online activity test end-clearing module M007-B1, which automatically clears the data upon completion of the online activity test. The output OUT of the valve open / closed state change count accumulation module is connected to the downstream online activity test success / failure criterion pre-module.

[0075] M011 is the online activity experiment success / failure criterion pre-module. The input parameter RI01 receives the output of the online activity experiment success / failure criterion pre-module and compares it with a preset number of times. If the cumulative number of changes is equal to 0, output BO01; if the cumulative number of changes is equal to 1, output BO02; if the cumulative number of changes is equal to 2, output BO03.

[0076] M012-B1 is a valve closing failure time delay module. Its delay time is the same as the valve closing time T1.

[0077] M013-B1 is the valve closing failure judgment module. The output BO01 of the online activity test success or failure criterion pre-module and the output of the valve closing failure time delay module are the same. If the valve open state does not disappear within time T1, that is, the valve does not move, it is judged as valve closing failure, and the red text "valve closing failure" will pop up on the operation panel.

[0078] M014-B1 is a valve opening failure time delay module. Its delay time is the same as the total valve action time T2.

[0079] M015-B1 is the valve opening failure judgment module. The output BO02 of the online activity test success or failure criterion pre-module and the output of the valve opening failure time delay module are synchronized. If the valve does not reach the open state within time T2, i.e., the valve does not reset, it is judged as a valve opening failure, and the red text "Valve opening failure" will pop up on the operation panel.

[0080] M016-B1 is the test success judgment module. Within the specified time T3 of the valve activity test, it ANDs the output BO03 of the upstream online activity test success / failure criterion pre-module with 1 to determine that the online activity test is successful, and a green "Success" message pops up on the screen.

[0081] Compared with the prior art, the beneficial effects of the present invention are:

[0082] This invention enables online activity testing without adding or changing field equipment or writing control logic. The test can be completed remotely with a single click on the screen, and the progress and results of the test are automatically judged and displayed.

[0083] The above formulas are all dimensionless numerical calculations. The formulas are derived from software simulations using a large amount of collected data to obtain the most recent real-world results. The preset parameters in the formulas are set by those skilled in the art based on the actual situation. The weighting coefficient and the proportional coefficient are used to quantify each parameter to obtain a specific value for easy comparison later. Regarding the weighting coefficient and the proportional coefficient, it is acceptable as long as they do not affect the proportional relationship between the parameter and the quantified value.

[0084] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to any specific implementation. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A method for online dynamic testing of a steam extraction check valve, characterized in that, The specific method is as follows: Step S100: Establish the online activity test logic for the check valve; Step S200: Add an online activity test operation panel; Step S300: Test the operating time of the steam extraction check valve; In step S300, during normal operation, the energizing time pulse of the extraction steam check valve control solenoid valve starts from 0 seconds and gradually increases in increments of 0.1 seconds until the valve just activates. The effective time t1 is recorded. After increasing the margin by 0.2 seconds, the sufficient time T1 is recorded. The entire process from the de-energization of the solenoid valve to its energization and the recovery of the extraction steam check valve to its initial state is recorded as the effective time t2. After increasing the margin by 0.2 seconds, the sufficient time T2 is recorded. Step S300 includes the following sub-steps: Open the operation panel and click the "Start Experiment" button in the operation panel to start the experiment; The solenoid valve loses power, and the extraction steam check valve closes. When the test time ends, the solenoid valve is energized, and the steam extraction check valve opens. If the valve does not disappear from the open state within the valve's closing time T1, meaning the valve does not move, it is judged as a valve closing failure, and the red text "valve closing failure" will pop up on the control panel. If the valve is not in the open state within the total valve action time T2, i.e. the valve is not reset, it is judged as valve opening failure, and the red text "valve opening failure" will pop up on the operation panel. If the check valve open status signal changes from 1 to 0 and then back to 1 within the total test time T3 of the valve activity test, it is considered a successful test, and the green text "valve opened successfully" will pop up on the operation panel.

2. The method for online operation testing of a steam extraction check valve according to claim 1, characterized in that, In step S100, when the unit is operating normally and the extraction steam check valve is fully open, the original solenoid valve is controlled by an RS trigger. The button is kept energized when pressed. In case of manual closing or unit malfunction, the solenoid valve is de-energized and the extraction steam check valve is closed under the push of the pipeline steam. The logic for the online activity test of the check valve needs to be built during unit shutdown. The logic for the online activity test of the check valve is built on the basis of the original logic, setting an online activity test start button, adding the valve just-closing time, outputting control solenoid valve, and conducting online activity test of the extraction steam check valve. Based on the results of each process of valve closing and opening within the specified time, the final conclusion of the online activity process is determined.

3. The online active test method for a steam extraction check valve according to claim 1, characterized in that, In step S200, the operation panel for the online activity test is connected. The operation panel serves as the button to start the online activity test, determines the final conclusion of the online activity process, and displays it as a report in a pop-up font.

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