Main steam isolation valve pressure relief valve automatic calibration device and calibration method

Abstract

The present application relates to the field of maintenance, in particular to a main steam isolation valve pressure relief valve automatic calibration device and calibration method. The device comprises: the upper cylinder of the MSIV simulation body is connected with a nitrogen cylinder; the oil tank is connected to the oil inlet of the MSIV simulation body through an oil inlet pipeline, and the oil return outlet of the MSIV simulation body is connected to the oil tank through an oil return pipeline; the inlet electromagnetic valve and the pneumatic pump are in an integrated structure, which is arranged on the oil inlet pipeline, and the pneumatic pump delivers the high-pressure fire-resistant oil in the oil tank to the MSIV simulation body; the inlet electromagnetic valve controls the start and stop of the pneumatic pump; the lower oil cylinder of the MSIV simulation body returns the fire-resistant oil to the oil tank through a flow control valve; two pressure relief valves are arranged in series on the oil return pipeline, and each pressure relief valve is controlled by a quick closing electromagnetic valve; the action of the pressure relief valve is measured by a displacement measuring element; a first pressure measuring element is arranged at the oil return outlet of the MSIV simulation body, and a second pressure measuring element is arranged on the oil return pipeline arranged between the two pressure relief valves. A control system is used to control the actuator to automatically perform function test, and to perform system monitoring, equipment debugging and data playback, and to alarm for the function test that does not pass. The present application simulates the actual operation condition of the pressure relief valve during the action of the MSIV, tests the comprehensive performance of the MSIV pressure relief valve, and then guides the subsequent maintenance direction of the pressure relief valve, finally verifies whether the performance of the pressure relief valve after maintenance is qualified, effectively avoids blind repair and wrong repair; and can also check the new spare parts to confirm their usability.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of maintenance, in particular to a main steam isolation valve pressure relief valve automatic calibration device and calibration method. BACKGROUND

[0002] The main steam isolation valve (MSIV) is used for the main steam system of the secondary loop of the pressurized water reactor nuclear power plant, and is one of the important and key valves of the nuclear power plant. Under normal operating conditions, the valve is in an open state. Under shutdown and accident conditions, the valve is automatically and quickly closed within 5 seconds after receiving the main steam isolation signal, so as to quickly isolate the main steam.

[0003] In order to realize the quick closing of the MSIV, the MSIV of Hualong No. 1 is designed to have a quick pressure relief function, and the core components thereof are two groups of four quick closing electromagnetic valves and four pressure relief valves controlled by the electromagnetic valves. Under normal conditions, the MSIV is slowly opened. Under accident conditions, the two groups of four electromagnetic valves are simultaneously electrified, and the corresponding pressure relief valves are opened, so as to realize the 5-second quick closing function.

[0004] The MSIV of Hualong No. 1 is the first to realize localization in China. During the commissioning and normal operation of the unit, the pressure relief valves frequently fail, and often have problems such as jamming and leakage, which affect the overall performance of the MSIV. Since the pressure relief valves mainly rely on imports, the replacement cost is high, and the procurement cycle is long. The generally adopted overall replacement greatly increases the maintenance cost of the unit. The present application develops a main steam isolation valve pressure relief valve automatic calibration device for carrying out performance detection of the pressure relief valve, so as to guide the subsequent maintenance direction of the pressure relief valve and improve the work efficiency of the maintenance. SUMMARY

[0005] The technical problem to be solved by the present application is to provide a main steam isolation valve pressure relief valve automatic calibration device and calibration method, simulate the actual operating conditions of the pressure relief valve during the operation of the MSIV, test the comprehensive performance of the MSIV pressure relief valve, guide the subsequent maintenance direction of the pressure relief valve, and finally verify whether the performance of the pressure relief valve after maintenance is qualified, so as to effectively avoid blind maintenance and wrong maintenance. The new spare parts can also be checked to confirm their usability.

[0006] The present application provides a steam isolation valve pressure relief valve automatic calibration device, which comprises an MSIV simulation body, an oil tank, an air inlet electromagnetic valve, a gas-liquid pump, two electromagnetic valves, two pressure relief valves, a flow control valve and a control system.

[0007] The upper cylinder of the MSIV simulation body is connected to a nitrogen cylinder.

[0008] The oil tank is connected to the oil inlet of the MSIV simulation body through an oil inlet pipeline, and the oil return port of the MSIV simulation body is connected to the oil tank through an oil return pipeline.

[0009] The intake electromagnetic valve and the pneumatic pump are integrated, arranged on the oil inlet pipeline, and the pneumatic pump delivers the high-pressure fire-resistant oil in the oil tank to the MSIV simulation body; the intake electromagnetic valve controls the opening and closing of the pneumatic pump;

[0010] The pneumatic pump is used to establish the oil pressure of the lower oil cylinder of the MSIV simulation body, and the nitrogen gas in the nitrogen cylinder is used to establish the gas pressure of the upper air cylinder of the MSIV simulation body through the gas spring function;

[0011] The fire-resistant oil of the lower oil cylinder of the MSIV simulation body is returned to the oil tank through the flow control valve;

[0012] Two pressure relief valves are arranged in series on the oil return pipeline, and each pressure relief valve is controlled by a quick closing electromagnetic valve;

[0013] The action of the pressure relief valve is measured by a displacement measuring element;

[0014] A first pressure measuring element is arranged at the oil return port of the MSIV simulation body, and a second pressure measuring element is arranged on the oil return pipeline arranged between the two pressure relief valves,

[0015] A control system is used to control the actuator to automatically perform function test, and to perform system monitoring, device debugging and data playback, and to alarm for the function test that does not pass.

[0016] In a specific embodiment of the present application, the upper part of the oil tank is provided with a cross-arranged baffle and an exhaust hole.

[0017] In a specific embodiment of the present application, the control system comprises a human-computer interface as an upper computer and a controller as a lower computer;

[0018] The human-computer interface is a computer and a corresponding software system, which is used for interaction between the system and the operator, receiving instructions of the operator and monitoring and displaying the system state, and sends instructions to the controller to control the corresponding actuator while displaying the system state;

[0019] The controller receives the instructions of the human-computer interface, controls the corresponding actuator, and feeds back the execution results of the actuator or the collected data to the human-computer interface.

[0020] In a specific embodiment of the present application, the software system comprises a user login system, a valve basic information input, a function test and alarm system, a monitoring system, a device debugging and a data playback;

[0021] The function test adopts a sequence control mode, automatically performs the next step when the condition is met, and stops and alarms if the condition cannot be met, and the function test comprises displacement test, sealing test and load test.

[0022] In one specific embodiment of the present application, both displacement measuring elements adopt linear variable differential transformer structure, wherein the measuring rod of one displacement measuring element is in close proximity to the spool, and the measuring rod of the other displacement measuring element is integrally designed with the spool of the pressure relief valve.

[0023] In one specific embodiment of the present application, the flow control valve is a mechanical regulating valve.

[0024] The present application also provides an automatic calibration method for a steam isolation valve pressure relief valve, which utilizes the automatic calibration device for the steam isolation valve pressure relief valve to perform displacement testing, sealing testing and load testing.

[0025] In one specific embodiment of the present application, the displacement testing adopts sequential control logic, and when the conditions are met, the next step is automatically performed, and if the conditions cannot be met, the testing is aborted and an alarm is given, and the specific steps include the following:

[0026] The two quick-closing electromagnetic valves are powered on through the control system, the displacement of the pressure relief valve controlled by the quick-closing electromagnetic valve is observed, and the opening of the pressure relief valve is confirmed;

[0027] The two quick-closing electromagnetic valves are powered off through the control system, the displacement of the pressure relief valve controlled by the quick-closing electromagnetic valve is observed, and the closing of the pressure relief valve is confirmed.

[0028] In one specific embodiment of the present application, the sealing testing adopts sequential control logic, and the specific steps include the following:

[0029] When detecting the pressure relief valve close to the MSIV simulation body: it is judged whether the pre-measured pressure of the pressure relief valve close to the MSIV simulation body meets the preconditions, if yes, the air inlet electromagnetic valve is closed, the two quick-closing electromagnetic valves are powered off, the pre-pressure oil pressure value of the pressure relief valve close to the MSIV simulation body is read and a pressure curve is automatically drawn, and the pressure curve is compared with the set value, and then the leakage of the pressure relief valve close to the MSIV simulation body is judged;

[0030] When detecting the pressure relief valve away from the MSIV simulation body: the quick-closing electromagnetic valve of the pressure relief valve close to the MSIV simulation body is powered on, the pressure relief valve close to the MSIV simulation body is opened, it is judged whether the pre-pressure of the pressure relief valve away from the MSIV simulation body meets the preconditions, if yes, the quick-closing electromagnetic valve of the pressure relief valve close to the MSIV simulation body is powered on, the quick-closing electromagnetic valve of the pressure relief valve away from the MSIV simulation body is powered off, the pre-measured pressure of the pressure relief valve away from the MSIV simulation body is read, and the pre-measured pressure is compared with the set value, and then the leakage of the pressure relief valve away from the MSIV simulation body is judged;

[0031] If there is no leakage in the two pressure relief valves, the sealing testing is successful, and the testing is ended;

[0032] If there is leakage in any one of the pressure relief valves, an alarm is given.

[0033] In a specific embodiment of the present application, the load test adopts sequence control logic, and specifically includes the following steps:

[0034] Confirm that the MSIV simulator is opened, and the quick closing electromagnetic valves are all de-energized;

[0035] When detecting the pressure relief valve close to the MSIV simulator, the quick closing electromagnetic valve controlling the pressure relief valve close to the MSIV simulator is briefly energized and then de-energized, the opening and closing of the pressure relief valve close to the MSIV simulator is confirmed by observing the displacement measuring element, and the pressure of the mother pipe is observed to be obviously increased and kept at a high pressure, which indicates that the pressure relief valve far from the MSIV simulator has no leakage, and if the pressure is reduced to a preset value, it indicates that the pressure relief valve far from the MSIV simulator has leakage;

[0036] When detecting the pressure relief valve far from the MSIV simulator, the quick closing electromagnetic valve controlling the pressure relief valve far from the MSIV simulator is briefly energized and then de-energized, the opening and closing of the pressure relief valve far from the MSIV simulator is confirmed by observing the displacement measuring element, and after a certain period of time, if the pressure of the mother pipe is increased to a certain value, it indicates that the pressure relief valve close to the MSIV simulator has leakage;

[0037] If both pressure relief valves have no leakage, the load test is successful, and the test is ended;

[0038] If any one of the pressure relief valves has leakage, an alarm is given.

[0039] Compared with the prior art, the main steam isolation valve pressure relief valve automatic verification device and verification method has the following beneficial effects:

[0040] (1) Without affecting the overall action of the pressure relief valve, the opening and closing of the pressure relief valve can be accurately measured;

[0041] (2) The laboratory pressure relief valve identification method can be applied to on-site testing, and the performance of single and complete pressure relief valves can be tested in combination with the actual situation on site, specifically including displacement testing, sealing testing and load testing;

[0042] (3) The verification device software automatically realizes the automatic verification function, alarm function and playback function of the pressure relief valve, and can automatically generate a corresponding verification report. BRIEF DESCRIPTION OF DRAWINGS

[0043] Figure 1 The figure shows the structural principle diagram of the main steam isolation valve pressure relief valve automatic verification device;

[0044] Figure 2 The figure shows the control schematic diagram of the main steam isolation valve pressure relief valve automatic verification device;

[0045] In the figure,

[0046] 1-MSIV simulator, 2-oil tank, 3-inlet solenoid valve, 4-pneumatic pump, 5-first fast closing solenoid valve, 6-second fast closing solenoid valve, 7-first pressure relief valve, 8-second pressure relief valve, 9-flow control valve, 10-first displacement measuring element, 11-second displacement measuring element, 12-first pressure measuring element, 13-second pressure measuring element, 14-nitrogen cylinder. DETAILED DESCRIPTION

[0047] In order to further understand the present application, the embodiments of the present application are described below in conjunction with examples, but it should be understood that these descriptions are only for further illustrating the features and advantages of the present application, but not for limiting the present application.

[0048] The embodiments of the present application disclose a kind of steam isolation valve pressure relief valve automatic calibration device, as shown in Figure 1 And Figure 2 It includes: MSIV simulator 1, oil tank 2, inlet solenoid valve 3, gas-liquid pump 4, two solenoid valves, two pressure relief valves, flow control valve 9, control system.

[0049] The MSIV simulator 1, the upper part is a cylinder, the lower part is an oil cylinder, and the middle is isolated by a piston, a nitrogen cylinder 14 is installed on the upper part of the cylinder to realize the fast closing of the MSIV simulator 1; the oil cylinder includes two circuits of oil inlet and oil return, wherein the oil inlet part is connected with the pneumatic pump 4, and the oil return part is connected with the oil return pipeline; according to the mechanical characteristics of MSIV, it is reduced in proportion to simulate the mechanical part of MSIV.

[0050] The oil tank 2 stores a certain volume of high-pressure fire-resistant oil, and a plurality of exhaust holes with different diameters are arranged in the oil tank in a cross arrangement to effectively prevent the fire-resistant oil from overflowing due to oil unloading during the fast closing process.

[0051] The oil tank 2 is connected to the oil inlet of the MSIV simulator 1 through an oil inlet pipeline, and the oil return port of the MSIV simulator 1 is connected to the oil tank through an oil return pipeline.

[0052] The inlet solenoid valve 3 and the pneumatic pump 4 are integrated, arranged on the oil inlet pipeline, and provide a reliable and stable power source; the pneumatic pump 4 delivers the high-pressure fire-resistant oil in the oil tank 2 to the MSIV simulator 1; the inlet solenoid valve 3 controls the start and stop of the pneumatic pump 4.

[0053] The pneumatic pump 4 is a gas-liquid booster pump, which is started when the inlet solenoid valve 3 is opened, the high-pressure fire-resistant oil is pressurized to the lower oil cylinder of the MSIV simulator 1 through the oil inlet pipeline, and the nitrogen in the upper part of the MSIV simulator 1 is compressed back to the nitrogen cylinder 14, and when the oil cylinder pressure reaches a certain multiple of the inlet solenoid valve 3 gas supply pressure, the pneumatic pump 4 stops running. The multiple is 40-70 times.

[0054] The nitrogen cylinder 14 is connected with the upper cylinder of the MSIV simulation body 1, and functions as a "gas spring" to realize the quick closing function. That is, when the MSIV simulation body 1 is opened, the lower oil cylinder of the MSIV simulation body 1 is filled with oil, and the nitrogen in the upper cylinder of the MSIV simulation body 1 is compressed back into the nitrogen cylinder 14; when the MSIV simulation body 1 is closed, the lower oil cylinder of the MSIV simulation body 1 is quickly drained, and the nitrogen in the nitrogen cylinder 14 is quickly released into the upper cylinder of the MSIV simulation body 1, thereby realizing the quick closing function;

[0055] The anti-flame oil in the lower oil cylinder of the MSIV simulation body 1 is returned to the oil tank 2 through the flow control valve 9; the flow control valve 9 is a mechanical regulating valve, which is used to control the speed of the anti-flame oil in the lower oil cylinder of the MSIV simulation body 1 returning to the oil tank, and when the oil discharge speed is too low, the flow control valve 9 can be opened to increase the discharge speed and thereby shorten the quick closing time;

[0056] Two pressure relief valves, i.e., the first pressure relief valve 7 and the second pressure relief valve 8, are connected in series on the oil return pipeline, and each pressure relief valve is controlled by a quick closing electromagnetic valve, i.e., the first pressure relief valve 7 is controlled by the first quick closing electromagnetic valve 5, and the second pressure relief valve 8 is controlled by the second quick closing electromagnetic valve 6;

[0057] The first quick closing electromagnetic valve 5 is electrified, and the first pressure relief valve 7 is automatically opened; similarly, the second quick closing electromagnetic valve 6 controls the second pressure relief valve 8 to be opened; only when the first quick closing electromagnetic valve 5 and the second quick closing electromagnetic valve 6 are electrified at the same time, the corresponding first pressure relief valve 7 and the second pressure relief valve 8 are opened at the same time, and the anti-flame oil in the lower oil cylinder of the MSIV simulation body 1 is returned to the oil tank 2 through the flow control valve 9; when only one of the first quick closing electromagnetic valve 5 or the second quick closing electromagnetic valve 6 is electrified, the high-pressure anti-flame oil in the lower oil cylinder of the MSIV simulation body 1 cannot be discharged to the oil tank 2 because only one pressure relief valve is opened in the oil return pipeline, and the MSIV simulation body 1 remains in the opened state.

[0058] The action of the pressure relief valve is measured by a displacement measuring element;

[0059] Specifically, the action of the first pressure relief valve 7 is measured by the first displacement measuring element 10, and the action of the second pressure relief valve 8 is measured by the second displacement measuring element 11;

[0060] The first displacement measuring element 10 adopts a linear variable differential transformer (LVDT) structure, the measuring rod of which is close to the valve core of the pressure relief valve, and through reasonable setting of the size and sealing structure of the built-in spring of the LVDT, the measuring element can accurately measure the whole process of opening and closing of the pressure relief valve without affecting the overall action of the pressure relief valve;

[0061] The second displacement measuring element 11 also adopts an LVDT structure, and the measuring rod of which is designed in an integrated manner with the valve core of the pressure relief valve, thereby accurately measuring the whole process of the action of the pressure relief valve 8.

[0062] A first pressure measuring element 12 is arranged at the oil return port of the MSIV simulation body 1 to measure the lower oil cylinder pressure of the MSIV simulation body 1;

[0063] A second pressure measuring element 13 is arranged at the oil return pipeline between the two pressure relief valves to measure the manifold pressure between the first pressure relief valve 7 and the second pressure relief valve 8;

[0064] In order to realize the compact arrangement of the system, a special control valve block is designed, which is connected with the MSIV simulation body 1, the oil tank 2, the inlet electromagnetic valve 3, the pneumatic pump 4, each quick closing electromagnetic valve, each pressure relief valve, the flow control valve 9, each displacement measuring element, and each pressure measuring element, and the elements are connected through through holes and sleeve joints;

[0065] A control system is used to control the automatic function test of the actuator, and to perform system monitoring, device debugging, and data playback, and to alarm for the function test that fails to pass.

[0066] The control system comprises a human-computer interface as an upper computer and a controller as a lower computer;

[0067] The human-computer interface body is a computer and a corresponding software system, which is used for the interaction between the system and the operator, the acceptance of the operator's instructions, and the monitoring and display of the system state, and sends instructions to the controller to control the corresponding actuator while displaying the system state;

[0068] The controller receives the instructions of the human-computer interface, controls the corresponding actuator, and feeds back the execution results of the actuator or the collected data to the human-computer interface.

[0069] The software system comprises a user login system, a valve basic information input, a function test, an alarm system, a monitoring system, a device debugging, and a data playback;

[0070] The function test adopts a sequence control mode, automatically proceeds to the next step when the conditions are met, and is aborted and alarms if the conditions cannot be met, and the function test comprises displacement test, sealing test, and load test.

[0071] The main steam isolation valve pressure relief valve performance test can be realized through the present verification device, wherein the verification device has a pressure resistance of not less than 40 MPa, can carry out single and complete pressure relief valve test, single valve test includes displacement measurement and sealing test two types, complete test includes load test, and the performance of the two pressure relief valves is confirmed from the system perspective.

[0072] The present check device designs two different displacement measuring elements of pressure relief valve: one is to tightly close the measuring rod to the valve core of pressure relief valve, and through reasonably setting the built-in spring stiffness and sealing structure of LVDT, the measuring element can accurately measure the whole process of the action of pressure relief valve without affecting the overall action of pressure relief valve; the other is that the measuring rod and the valve core of pressure relief valve adopt an integrated structure and synchronously act with the valve core of pressure relief valve, and then accurately measure the whole process of the action.

[0073] The present check device uses a pneumatic pump to establish the oil pressure of the lower oil cylinder of the MSIV simulation body, and uses the "gas spring" function of nitrogen in a nitrogen cylinder to establish the air pressure of the upper air cylinder of the MSIV simulation body, and both reach dynamic balance when the MSIV simulation body is opened.

[0074] The present check device realizes process monitoring, alarm display, trend graph, data analysis, accident playback, report printing and other functions through a software control system.

[0075] The embodiment of the present application also discloses an automatic check method of pressure relief valve of steam isolation valve, which uses the automatic check device of pressure relief valve of steam isolation valve to perform displacement testing, sealing testing and load testing.

[0076] The displacement testing adopts sequential control logic, and if the conditions are met, the next step is automatically performed, if the conditions cannot be met, the process is stopped and an alarm is given, and the specific steps include the following steps:

[0077] The control system is used to electrify the two quick closing electromagnetic valves, the displacement of the pressure relief valve controlled by the quick closing electromagnetic valve is observed, and the opening of the pressure relief valve is confirmed;

[0078] The control system is used to de-electrify the two quick closing electromagnetic valves, the displacement of the pressure relief valve controlled by the quick closing electromagnetic valve is observed, and the closing of the pressure relief valve is confirmed.

[0079] Specifically, the first quick closing electromagnetic valve 5 is electrified, the first displacement measuring element 10 of the first pressure relief valve 7 is observed, and the opening of the first pressure relief valve 7 is confirmed; the first quick closing electromagnetic valve 5 is de-electrified, the first displacement measuring element 10 of the first pressure relief valve 7 is observed, and the closing of the first pressure relief valve 7 is confirmed. Similarly, the second electromagnetic valve 6 is electrified and de-electrified, the second displacement measuring element 11 is observed, and the action of the second pressure relief valve 8 is confirmed.

[0080] The sealing testing adopts sequential control logic, and the specific steps include the following steps:

[0081] When detecting the pressure relief valve close to the MSIV simulator, judge whether the measured pressure before the pressure relief valve close to the MSIV simulator meets the precondition, if yes, close the air inlet electromagnetic valve, keep the two quick closing electromagnetic valves de-energized, read the oil pressure value before the pressure relief valve close to the MSIV simulator and automatically draw a pressure curve, and compare it with the set value, and then judge the leakage of the pressure relief valve close to the MSIV simulator;

[0082] When detecting the pressure relief valve away from the MSIV simulator, the quick closing electromagnetic valve of the pressure relief valve close to the MSIV simulator is energized, the pressure relief valve close to the MSIV simulator is opened, judge whether the pressure before the pressure relief valve away from the MSIV simulator meets the precondition, if yes, keep the quick closing electromagnetic valve of the pressure relief valve close to the MSIV simulator energized, de-energize the quick closing electromagnetic valve of the pressure relief valve away from the MSIV simulator, read the measured pressure of the mother pipe before the pressure relief valve away from the MSIV simulator, and compare it with the set value, and then judge the leakage of the pressure relief valve away from the MSIV simulator;

[0083] If there is no leakage in the two pressure relief valves, the sealing test is successful, and the test is ended;

[0084] If there is leakage in any one of the pressure relief valves, an alarm is given. Specifically, when testing the first pressure relief valve 7, judge whether the measured pressure before the first pressure relief valve 7, i.e. the first pressure measuring element 12, meets the precondition, if yes, close the air inlet electromagnetic valve 3, keep the first quick closing electromagnetic valve 5 and the second quick closing electromagnetic valve 6 de-energized, start reading the oil pressure value of the first pressure measuring element 12 and automatically draw a pressure curve, and compare it with the set value, and then judge whether the first pressure relief valve 7 has leakage. When testing the second pressure relief valve 8, the first quick closing electromagnetic valve 5 is energized, the first pressure relief valve 7 is opened, judge whether the mother pipe pressure before the second pressure relief valve 8 meets the precondition, if yes, close the air inlet electromagnetic valve 3, keep the first quick closing electromagnetic valve 5 energized and the second quick closing electromagnetic valve 6 de-energized, start reading the oil pressure value of the second pressure measuring element 13 and automatically draw a pressure curve, and compare it with the set value, and then judge whether the second pressure relief valve 8 has leakage.

[0085] The load test adopts sequential control logic, specifically including the following steps:

[0086] Confirm that the MSIV simulator 1 is opened, and the quick closing electromagnetic valves are de-energized;

[0087] When detecting the pressure relief valve close to the MSIV simulation body 1: the fast closing solenoid valve controlling the pressure relief valve close to the MSIV simulation body is energized and de-energized, the displacement measuring element is observed to confirm that the pressure relief valve close to the MSIV simulation body is opened and closed, the mother pipe pressure is observed to be obviously increased and kept at a high pressure, which indicates that the pressure relief valve far from the MSIV simulation body has no leakage, and if the pressure is reduced to a preset value, it indicates that the pressure relief valve far from the MSIV simulation body has leakage.

[0088] That is, the first fast closing solenoid valve 5 is energized and de-energized, the first displacement measuring element 10 is observed to confirm that the first pressure relief valve 7 is opened and closed, and the pressure of the second pressure measuring element 13 is observed to be obviously increased and kept at a high pressure, which indicates that the second pressure relief valve 8 has no leakage, and if the pressure is reduced to a preset value, it indicates that the second pressure relief valve 8 has leakage.

[0089] When detecting the pressure relief valve far from the MSIV simulation body: the fast closing solenoid valve controlling the pressure relief valve far from the MSIV simulation body is energized and de-energized, the displacement measuring element is observed to confirm that the pressure relief valve far from the MSIV simulation body is opened and closed, and after a period of time, if the mother pipe pressure is increased to a certain value, it indicates that the pressure relief valve close to the MSIV simulation body has leakage.

[0090] That is, the second fast closing solenoid valve 6 is energized and de-energized, the second displacement measuring element 11 is observed to confirm that the second pressure relief valve 8 is opened and closed, and after a period of time, if the pressure of the second pressure measuring element 13 is increased to a certain value, it indicates that the first pressure relief valve 7 has leakage.

[0091] If both pressure relief valves have no leakage, the load test is successful, and the test is ended.

[0092] If any one of the pressure relief valves has leakage, an alarm is given.

[0093] The automatic control process for normal opening of the MSIV simulation body 1 is as follows: the normal opening button on the human-computer interaction page of the control system is clicked, the intake solenoid valve 3 is energized, the pneumatic pump 4 is automatically started, the anti-flame oil in the oil tank 2 is pressed into the lower cylinder of the MSIV simulation body 1, the nitrogen gas pressure released by the upper nitrogen cylinder 14 of the simulation body is overcome to open the MSIV simulation body 1, when the oil cylinder pressure reaches a predetermined value, the pneumatic pump 4 is automatically stopped, and the MSIV simulation body 1 remains in an open state.

[0094] The automatic control process for fast closing of the MSIV simulation body 1 is as follows: the fast closing button on the human-computer interaction page of the control system is clicked, the intake solenoid valve 3 is de-energized, the first fast closing solenoid valve 5 and the second fast closing solenoid valve 6 are simultaneously energized, the first pressure relief valve 7 and the second pressure relief valve 8 are simultaneously opened, the anti-flame oil in the lower cylinder of the MSIV simulation body 1 is quickly returned to the oil tank 2, and the MSIV simulation body 1 is quickly closed under the pressure of the upper cylinder.

[0095] The above description of the embodiments is only for the purpose of helping understand the method of the present application and its core idea. It should be noted that, for those skilled in the art, some modifications and improvements can be made to the present application without departing from the principle of the present application, and these modifications and improvements also fall within the protection scope of the claims of the present application.

[0096] The above description of the disclosed embodiments enables a person skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An automatic calibration device for a steam isolation valve and a pressure relief valve, characterized in that: include: MSIV simulation body, fuel tank, air intake solenoid valve, gas-liquid dual-purpose pump, two solenoid valves, two pressure relief valves, flow control valve, control system; The upper cylinder of the MSIV simulation body is connected to the nitrogen tank; The oil tank is connected to the oil inlet of the MSIV simulation body through an oil inlet pipe, and the oil return port of the MSIV simulation body is connected to the oil tank through an oil return pipe; The air intake solenoid valve and the pneumatic pump are integrated into one structure and are installed on the oil inlet pipeline. The pneumatic pump delivers the high-pressure fire-resistant oil in the fuel tank to the MSIV simulator. The air intake solenoid valve controls the opening and closing of the pneumatic pump. Use a pneumatic pump to establish the oil pressure in the lower cylinder of the MSIV simulated body, and use the gas spring function of the nitrogen in the nitrogen bottle to establish the air pressure in the upper cylinder of the MSIV simulated body; The anti-fire oil in the lower cylinder of the MSIV simulation body flows back to the tank through the flow control valve; Two pressure relief valves are arranged in series on the oil return pipeline, and each pressure relief valve is controlled by a fast-closing solenoid valve; The action of the pressure relief valve is measured by a displacement measuring element; A first pressure measuring element is provided at the oil return port of the MSIV simulation body, and a second pressure measuring element is provided on the oil return pipeline between the two pressure relief valves. The control system is used to control the actuator to automatically perform functional tests, and perform system monitoring, equipment debugging and data playback, and alarm for failed functional tests.

2. The automatic calibration device for steam isolation valve and pressure relief valve according to claim 1 is characterized in that: A cross-arranged baffle and exhaust holes are provided in the upper middle portion of the oil tank.

3. The automatic calibration device for steam isolation valve and pressure relief valve according to claim 1, characterized in that: The control system includes a human-machine interface as a host computer and a controller as a slave computer; The human-machine interface is a computer and its corresponding software system, which is used for interaction between the system and the operator, receiving the operator's instructions, and monitoring and displaying the system status. While displaying the system status, it also sends instructions to the controller to control the corresponding actuators. The controller receives instructions from the human-machine interface, controls the corresponding execution mechanism, and feeds back the execution results or collected data of the execution mechanism to the human-machine interface.

4. The automatic calibration device for steam isolation valve and pressure relief valve according to claim 3 is characterized in that: The software system includes user login system, valve basic information input, function test, alarm system, monitoring system, equipment debugging and data playback; The functional test adopts a sequential control method. When the conditions are met, the next step is automatically performed. If the conditions cannot be met, the test is terminated and an alarm is issued. The functional test includes a displacement test, a sealing test and a load test.

5. The automatic calibration device for steam isolation valve and pressure relief valve according to claim 1, characterized in that: The two displacement measuring elements both adopt a linear variable differential transformer structure, wherein the measuring rod of one displacement measuring element is close to the valve core, and the measuring rod of the other displacement measuring element is integrated with the valve core of the pressure relief valve.

6. The automatic calibration device for steam isolation valve and pressure relief valve according to claim 1, characterized in that: The flow control valve is a mechanical regulating valve.

7. A steam isolation valve pressure relief valve automatic calibration method, characterized in that: The automatic calibration device for a steam isolation valve and a pressure relief valve according to any one of claims 1 to 5 is used to perform displacement testing, sealing testing and load testing.

8. The automatic calibration method for steam isolation valve and pressure relief valve according to claim 7, characterized in that: The displacement test adopts sequential control logic. When the conditions are met, the next step is automatically performed. If the conditions are not met, the test is terminated and an alarm is issued. Specifically, the following steps are included: The two quick-closing solenoid valves are energized through the control system, and the displacement of the pressure relief valves controlled by the quick-closing solenoid valves is observed to confirm the opening of the pressure relief valves; The two quick-closing solenoid valves are de-energized through the control system, and the displacement of the pressure relief valve controlled by the quick-closing solenoid valve is observed to confirm the closing status of the pressure relief valve.

9. The automatic calibration method for steam isolation valve and pressure relief valve according to claim 7, characterized in that: The sealing test adopts sequential control logic and specifically includes the following steps: When testing the pressure relief valve close to the MSIV simulation body: determine whether the measured pressure in front of the pressure relief valve close to the MSIV simulation body meets the precondition. If so, close the intake solenoid valve, and keep the two quick-closing solenoid valves de-energized. Read the oil pressure value in front of the pressure relief valve close to the MSIV simulation body and automatically draw a pressure curve. Compare it with the set value to determine the leakage of the pressure relief valve close to the MSIV simulation body. When detecting the pressure relief valve far away from the MSIV simulation body: the quick-closing solenoid valve of the pressure relief valve close to the MSIV simulation body is energized, and the pressure relief valve close to the MSIV simulation body is opened, and it is judged whether the pressure in front of the pressure relief valve far away from the MSIV simulation body meets the precondition. If it meets the precondition, the quick-closing solenoid valve of the pressure relief valve close to the MSIV simulation body remains energized, and the quick-closing solenoid valve of the pressure relief valve far away from the MSIV simulation body is de-energized. The measured pressure of the main pipe in front of the pressure relief valve far away from the MSIV simulation body is read and compared with the set value, so as to judge the leakage of the pressure relief valve far away from the MSIV simulation body; If there is no leakage in both pressure relief valves, the sealing test is successful and the test ends; If there is leakage in any pressure relief valve, an alarm will be triggered.

Images