CN-115791146-B - Online activity test method for steam extraction check valve

CN115791146BCN 115791146 BCN115791146 BCN 115791146BCN-115791146-B

Abstract

The invention discloses an online activity test method of a steam extraction check valve, which belongs to the field of check valves and is used for solving the problems that the steam extraction check valve of a thermal power plant is configured to be a non-test device or a manual test device at present, the non-test device needs to control the electromagnetic valve action of the steam extraction check valve to greatly disturb a thermodynamic system, and the manual test device has a plurality of pre-conditions for carrying out activity test, and the method comprises the following steps of: building an online activity test logic of the check valve: setting up an online activity test logic of a check valve, setting an input button of the online activity test during the shutdown period of a unit, increasing the valve closing time, and judging the final conclusion of the online activity process according to the results of closing and opening the valve in the specified time; an online activity test operation panel is additionally arranged; the invention realizes the function of online activity test by testing the action time of the steam extraction check valve, the test is completed by remote one-key operation on a picture, and whether the test progress and result are successful or not is automatically judged and displayed.

Inventors

Ke Jinchao

Assignees

中电(商丘)热电有限公司

Dates

Publication Date: 20260505
Application Date: 20221020

Claims (3)

1. An online activity test method for a steam extraction check valve is characterized by comprising the following steps: Step S100, constructing an online activity test logic of a check valve; Step S200, an online activity test operation panel is additionally arranged; Step S300, testing the action time of the steam extraction check valve; In step S300, during normal operation, the charging time pulse of the electromagnetic valve is controlled by the steam extraction check valve to be gradually increased by taking 0.1 second as a gradient from 0 second until the valve just acts, the effective time T1 is recorded, the full time T1 is recorded after the margin is increased for 0.2 second, the whole process from the power failure of the electromagnetic valve to the power acquisition of the electromagnetic valve, the steam extraction check valve is restored to the initial state, the effective time T2 is recorded, and the full time T2 is recorded after the margin is increased for 0.2 second; the step S300 includes the following sub-steps: Opening the operation panel, clicking a start button of the activity test in the operation panel, and starting the test; The electromagnetic valve is powered off, and the steam extraction check valve is closed; After the test time is over, the electromagnetic valve is powered on, and the steam extraction check valve is opened; In the valve closing time T1, the valve opening state is not disappeared, namely the valve does not act, the valve closing failure is judged, and the red font is popped up on the operation panel to be closed; In the total valve action time T2, if the valve opening state is not reached, namely the valve is not reset, judging that the valve opening fails, and popping up the red font valve opening failure on the operation panel; and in the total time T3 of the valve activity test, the check valve opening state signal is changed from 1 to 0 and from 0 to 1, the test is judged to be successful, and the green font valve opening is popped up on the operation panel to be successful.
2. The method for online activity test of a steam extraction check valve according to claim 1, wherein in step S100, under the condition that the unit is normally operated, i.e. the steam extraction check valve is fully opened, the original electromagnetic valve is controlled to be an RS trigger, the click button is kept to be normally electrified, the electromagnetic valve is in power failure by interlocking under the condition of manual closing or unit abnormality, and the steam extraction check valve is closed under the pushing of pipeline steam; The construction of the on-line activity test logic of the check valve is required to be carried out in the machine set shutdown period, the on-line activity test logic of the check valve is constructed on the basis of the original logic, an input button of the on-line activity test is arranged, the valve closing time is increased, a control electromagnetic valve is output, the on-line activity test of the steam extraction check valve is carried out, and the final conclusion of the on-line activity process is judged according to the results of closing and opening the valve in the specified time.
3. The method according to claim 1, wherein in step S200, an operation panel for the on-line activity test is connected, the operation panel is used as an on-line activity test input button, a final conclusion of the on-line activity progress is judged, and the final conclusion is displayed as a report in a font popup manner.

Description

Online activity test method for steam extraction check valve Technical Field The invention belongs to the field of steam extraction check valves, relates to a motion test technology, and in particular relates to an online motion test method of a steam extraction check valve. Background The check valve is a valve which can automatically open and close the valve clack by means of the flow of the medium and is used for preventing the medium from flowing backwards, and is also called a one-way valve, a reverse flow valve and a back pressure valve. The check valve is an automatic valve and has the main functions of preventing medium from flowing backwards, preventing the reverse rotation of the pump and the driving motor and preventing the medium in the container from leaking. The check valve may also be used in a line to provide makeup to auxiliary systems where the pressure may rise above the system pressure. The check valve is mainly classified into a swing check valve (rotated by the center of gravity) and a lift check valve (moved along the axis). The steam extraction check valve is one of check valves, and is automatically closed when steam and/or water flow back to the turbine body through the steam extraction pipe. At present, the configuration of the steam extraction check valve of the thermal power plant is mostly provided with no test device or manual test device, the no test device needs to control the action of the electromagnetic valve of the steam extraction check valve, the disturbance on a thermodynamic system is large, the safety risk is higher, the test can only be carried out before the unit is planned to stop running and slide stop, the precondition of the manual test device for carrying out the activity test is very much, for example, the load requirement and the related automatic regulation are good, in the test process, the requirement on an operator is higher, the operator has to be skilled, the speed is fast, accurate and stable, and the operator has to be on site, because the space is narrow, the distance is close to the steam extraction check valve, and the personal safety risk exists. Disclosure of Invention Aiming at the defects existing in the prior art, the invention aims to provide an online activity test method for a steam extraction check valve. The technical problems to be solved by the invention are as follows: How to change the current situation that the steam extraction check valve of the thermal power plant is not provided with a test device or a manual test device, thereby providing the thermal power plant with an online movable test device of the steam extraction check valve. The aim of the invention can be achieved by the following technical scheme: An online activity test method for a steam extraction check valve comprises the following steps: Step 100, building an online activity test logic of a check valve; step 200, adding an online activity test operation panel; and step 300, testing the action time of the steam extraction check valve. Further, in step S100, when the unit is in normal operation, i.e. the steam extraction check valve is fully opened, the original electromagnetic valve is controlled to be an RS trigger, the click button is kept to be normally electrified, the electromagnetic valve is in interlocking to lose electricity under the condition of manual closing or abnormal unit, and the steam extraction check valve is closed under the pushing of pipeline steam; The construction of the on-line activity test logic of the check valve is required to be carried out in the machine set shutdown period, the on-line activity test logic of the check valve is constructed on the basis of the original logic, an input button of the on-line activity test is arranged, the valve closing time is increased, a control electromagnetic valve is output, the on-line activity test of the steam extraction check valve is carried out, and the final conclusion of the on-line activity process is judged according to the results of closing and opening the valve in the specified time. Further, in step S200, an operation panel for the online activity test is connected, and the operation panel is used as an input button for the online activity test, determines a final conclusion of the online activity process, and displays the final conclusion as a report in a font popup manner. Further, in step S300, during normal operation, the charging time pulse of the steam extraction check valve control solenoid valve starts from 0 seconds, gradually increases with a gradient of 0.1 seconds until the valve just acts, the effective time T1 is recorded, and after the margin is increased by 0.2 seconds, the sufficient time T1 is recorded; and (3) recording the effective time T2 in the whole process from the power failure of the electromagnetic valve to the power acquisition of the electromagnetic valve, and recording the sufficient time T2 after the margin is increased for 0.2 seconds. Further, the work