Control method and control device for industrial steam supply rapid isolation device of nuclear power plant

Abstract

The invention relates to the field of nuclear power, in particular to a control method and a control device of a nuclear power plant industrial steam supply rapid isolation device. The method comprises the following steps: commissioning the rapid isolation device; a hydraulic oil pump automatic start-stop control function is input, and normal operation of the rapid isolation device is maintained; during normal operation of the quick isolation device, whether a mechanical part is jammed or not is verified through an activity test, and the performance of a quick-closing electromagnetic valve is verified through a quick-closing test; the quick-closing function of the quick isolation device is achieved through two mutually redundant quick-closing loops, namely a quick-closing valve block A assembly and a quick-closing valve block B assembly, and quick-closing tests of the two quick-closing valve block assemblies are executed separately. Each quick-closing valve block assembly is provided with two quick-closing electromagnetic valves, pressure measuring points which are connected in series are arranged in front of each quick-closing electromagnetic valve, and action tests of the two electromagnetic valves are executed in sequence; normally stopping the quick isolation device or quickly stopping the quick isolation device; the safety instrument control system and the normal operation instrument control system independently control the rapid isolation device to realize rapid shutdown. According to the invention, the control quality and reliability are improved, and the purpose of optimizing the control function of the rapid isolation device is achieved.

Description

Technical Field

[0001] The present invention relates to the field of nuclear power, and in particular to a control method and a control device for a nuclear power plant industrial steam supply rapid isolation device. Background Art

[0002] The reactor of a nuclear power plant generates energy, and the steam generator transfers heat to the secondary circuit through the primary circuit. The main steam generated in the secondary circuit drives the turbine to convert it into electrical energy. In order to promote the high-quality development of modern industry, nuclear power plants use the extraction of the main steam from the secondary circuit as a heat source, heat the medium of the tertiary circuit through heat exchange equipment, and then produce high-quality industrial steam. Therefore, the comprehensive utilization of nuclear energy has expanded from single power generation and heating for urban residents to the field of industrial steam supply.

[0003] The rapid isolation device is installed on the main steam pipe that leads the secondary circuit main steam of the nuclear power plant to the heating main steam conversion equipment. When the radioactivity concentration of the secondary circuit main steam exceeds the design limit, the rapid isolation device is interlocked and closed, cutting off the main steam supply to the steam conversion device to ensure that the medium of the industrial main steam circuit is not contaminated and protect the safety of users. The shutdown time does not exceed 5 seconds.

[0004] The control method of the rapid isolation device is divided into two modes: slow closing and fast closing, which are achieved by controlling the slow closing circuit solenoid valve and the fast closing circuit solenoid valve. As the first nuclear energy steam supply project for industrial use, there is no experience to refer to for the control of the rapid isolation device. It is necessary to obtain the fast closing time limit of the rapid isolation device based on the main steam characteristic parameters such as the flow velocity of steam in the main steam main pipe to ensure that radioactive materials do not enter the industrial steam conversion equipment. The main control difficulty is the risk of refusal and false operation of the rapid isolation device, including single hardware failures and false triggering of software signals.

[0005] At present, the control method of the main steam rapid isolation valve of a nuclear power plant is similar to that of the rapid isolation device described in the present invention, but the control method has technical defects, such as the automatic rapid closing command is only automatically triggered by the protection system, and the command of a single control system is uncertain; the start and stop and test of the equipment are manually controlled by the operator according to the equipment status, and the increased operator load leads to an increased probability of human error; the activity test is only triggered by a 90% limit switch as the only condition for test feedback, and a 90% limit switch failure may cause the valve to be fully closed, etc. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a control method and a control device for a nuclear power plant industrial steam supply rapid isolation device, thereby improving the control quality and reliability and achieving the purpose of optimizing the control function of the rapid isolation device.

[0007] The present invention provides a control method for a nuclear power plant industrial steam supply rapid isolation device, comprising the following steps:

[0008] Step S1: putting the rapid isolation device into operation;

[0009] Step S2: Activate the automatic start and stop control function of the hydraulic oil pump to maintain the normal operation of the rapid isolation device;

[0010] Step S3: During the normal operation of the rapid isolation device, the activity test is performed to verify whether the mechanical part is stuck, and the quick closing solenoid valve performance is verified through a quick closing test; the quick closing function of the rapid isolation device is realized by two mutually redundant quick closing circuits, namely the quick closing valve block A component and the quick closing valve block B component, and the quick closing tests of the two sets of quick closing valve block components are performed separately; each set of quick closing valve block components is designed with two quick closing solenoid valves, and a series pressure measuring point is set in front of each quick closing solenoid valve, and the two solenoid valve action tests are performed in sequence;

[0011] Step S4: Normally shut down the rapid isolation device or rapidly shut down the rapid isolation device;

[0012] The safety instrumentation and control system and the normal operation instrumentation and control system independently control the rapid isolation device to achieve rapid shutdown.

[0013] In a specific embodiment of the present invention, the step S1 specifically includes:

[0014] After the DCS control system issues a command to put the rapid isolation device into operation, the solenoid valve of the pressure relief line is closed according to the command signal, the hydraulic oil pump is started, and the hydraulic oil enters the lower cavity of the valve drive mechanism through the oil supply pipeline. As the hydraulic oil pressure continues to increase, the nitrogen pressure in the upper cavity of the valve drive mechanism and the weight of the valve body are offset, and the main valve slowly opens to the open position.

[0015] In a specific embodiment of the present invention, step S2 specifically includes:

[0016] On the OM screen of the control room, the control module for the automatic start and stop function of the hydraulic oil pump is placed in the engaged state; when the hydraulic oil pressure in the hydraulic oil supply pipeline is less than 32.5MPa and the hydraulic oil pump is in a stopped state, the hydraulic oil pump is automatically started; when the hydraulic oil pressure in the hydraulic oil supply pipeline is greater than 34.2MPa and the hydraulic oil pump is in a running state, the hydraulic oil pump is automatically stopped; in addition, if the hydraulic oil pump runs continuously for more than 7 minutes, the continuous operation alarm is triggered to prompt the operator to pay attention to the status of the hydraulic oil pump and pipeline.

[0017] In a specific embodiment of the present invention, in step S3, the activity test is a 90% opening activity test.

[0018] In a specific embodiment of the present invention, the 90% opening activity test specifically includes:

[0019] After the DCS control system issues a test permission command, if the open position limit switch is triggered and the 90% valve position limit switch is not triggered, a 90% opening activity test action command is generated;

[0020] After the 90% opening activity test action command is issued, the hydraulic oil pump stops, the slow closing solenoid valve is powered on and opened, the hydraulic oil is depressurized through the hydraulic oil supply / return pipeline, and the main valve is slowly closed under the nitrogen pressure in the upper cavity of the valve drive mechanism and the weight of the valve body; when the 90% valve position limit switch is triggered or the 90% opening activity test action command continues for a period of time, a 90% opening activity test end signal is generated; after the 90% opening activity test end command is issued, the hydraulic oil pump starts, the slow closing solenoid valve is powered off and closed, and the hydraulic oil is pressurized through the hydraulic oil supply / return pipeline. As the hydraulic oil pressure continues to increase, the nitrogen pressure in the upper cavity of the valve drive mechanism and the weight of the valve body are offset, and the main valve slowly opens until the open position limit switch is triggered, and the test ends.

[0021] In a specific embodiment of the present invention, the quick closing test specifically includes: after the DCS control system issues a test permission instruction, if the pressure in front of the second solenoid valve in the quick closing valve block assembly is greater than 20MPa, the first solenoid valve meets the opening condition, and at this time the first solenoid valve is powered on and opened. If the pressure in front of the first solenoid valve is less than 3MPa within 30 seconds, a first solenoid valve test success signal is generated, and the first solenoid valve is powered off and closed; after the first solenoid valve test is successful, a second solenoid valve start test signal is generated. If the pressure in front of the first solenoid valve is greater than 20MPa, the second solenoid valve meets the opening condition, and at this time the second solenoid valve is powered on and opened. If the pressure in front of the second solenoid valve is less than 3MPa within 30 seconds, a second solenoid valve test success signal is generated, and the second solenoid valve is powered off and closed; if the tests of the two solenoid valves are successful, it indicates that the quick closing test of the quick closing valve block A assembly is successful, otherwise it indicates that the quick closing test of the quick closing valve block A assembly has failed;

[0022] Test the quick-closing valve block B assembly in the same way.

[0023] In a specific embodiment of the present invention, in step S4, the normal shutdown specifically includes:

[0024] After the DCS control system issues a command to shut down the rapid isolation device normally, it opens the slow-closing solenoid valve, shuts down the hydraulic oil pump, and the hydraulic oil flows back to the oil tank under the action of nitrogen pressure and the deadweight of the valve body, and the main valve slowly closes to the closed position.

[0025] In a specific embodiment of the present invention, in step S4, the rapid shutdown specifically includes:

[0026] The safety instrumentation and control system or the normal operation instrumentation and control system logic votes to generate a quick-closing command. The quick-closing solenoid valves in the two sets of quick-closing valve block assemblies are energized and opened at the same time. The oil pressure in the lower cavity of the valve drive mechanism drops rapidly, and the main valve closes quickly under the dual pressure of nitrogen pressure and deadweight.

[0027] The present invention provides a control device for a nuclear power plant industrial steam supply rapid isolation device, comprising: a nitrogen gas pressure valve block assembly, a slow closing valve block assembly, a fast closing valve block A assembly, a fast closing valve block B assembly, and a hydraulic oil assembly;

[0028] The hydraulic oil assembly includes a hydraulic oil pump and an oil tank;

[0029] The hydraulic oil in the hydraulic oil assembly is transported to the oil supply line in the slow-closing module assembly through the hydraulic oil pump. One line is connected to the lower part of the accumulator to assist in energy storage; the other line is connected to the lower cavity of the drive mechanism through the hydraulic oil supply / return pipeline to provide hydraulic oil and recover hydraulic oil when the rapid isolation device is put into operation and shut down;

[0030] A slow-closing solenoid valve is provided on the hydraulic oil supply / return pipeline in the slow-closing module assembly;

[0031] The quick-closing valve block A component and the quick-closing valve block B component are redundant circuits, one end of which is connected to the lower cavity of the driving mechanism, and the other end is connected to the oil tank through the oil return pipeline;

[0032] Two quick-closing solenoid valves are respectively arranged in the quick-closing valve block A component.

[0033] Two quick-closing solenoid valves are respectively arranged in the quick-closing valve block B component.

[0034] One end of the nitrogen gas pressure valve block assembly is connected to the accumulator through a nitrogen pipeline, and the other end is connected to the nitrogen tank;

[0035] Open limit switch, close limit switch, 90% of valve position limit switches are set with two, which are redundant to each other;

[0036] Two open limit switches, two closed limit switches, and two 90% valve position limit switches are installed on the actuator bracket according to the valve stem stroke to represent the valve opening state;

[0037] The signals of the first open limit switch and the first closed limit switch are connected to the DCS control system of the nuclear power unit, and the signals of the second open limit switch and the second closed limit switch are connected to the DCS control system of the industrial steam thermal control room;

[0038] The main valve is installed in the main pipe that leads the secondary circuit main steam to the industrial steam conversion equipment, and performs the switching function according to the control instructions.

[0039] In a specific embodiment of the present invention, a pressure gauge is arranged before each fast-closing solenoid valve, and a pressure gauge is arranged before each slow-closing solenoid valve.

[0040] Compared with the prior art, the control method and control device of the nuclear power plant industrial steam supply rapid isolation device of the present invention have the following beneficial effects:

[0041] (1) Both the safety instrumentation and control system and the normal operation instrumentation and control system can independently realize the fast closing function of the rapid isolation device according to the radioactive leakage monitoring signal, realize the redundant design of the fast closing function at the control system level, avoid the risk of refusal to operate, and effectively improve the availability of the rapid isolation device;

[0042] (2) The quick-closing instructions at the control system level are designed as redundant, the quick-closing valve block components at the control loop level are designed as redundant, and the quick-closing solenoid valves at the control equipment level are designed as redundant. Therefore, the quick-closing function is designed as redundant in both software and hardware design, avoiding the risk of false operation and effectively improving the reliability of the quick isolation device;

[0043] (3) The open and closed position limit switches of the rapid isolation device are designed to be two, one of which is connected to the DCS control system of the nuclear power unit, and the other is connected to the DCS control system of the industrial steam thermal control room, thereby realizing two control platforms to independently monitor the open and closed positions of the rapid isolation device, and realizing diversified equipment status monitoring;

[0044] (4) The risk of accidental closure of non-rapid isolation devices during the test is eliminated by designing the interlocking control logic between the two solenoid valves and the pre-valve pressure limit in the same quick-closing valve block assembly, and by designing the activity and quick-closing test instruction time limit judgment control logic.

[0045] (5) By designing the automatic start-stop control logic and switching function of the hydraulic oil pump, automatic control of the hydraulic oil pump is achieved, effectively reducing the burden on the operator. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 A schematic diagram showing the structure of the control device of the rapid isolation device;

[0047] In the figure, 1: accumulator; 2: slow closing valve block assembly; 3: check valve; 4: pressure gauge before slow closing solenoid valve; 5: slow closing solenoid valve; 6: hydraulic oil assembly; 7: hydraulic oil pump; 8: nitrogen pipeline; 9: hydraulic oil supply / return pipeline; 10: quick closing valve block A assembly; 11: pressure gauge before the first valve; 12: first quick closing solenoid valve; 13: pressure gauge before the second valve; 14: second quick closing solenoid valve; 15: quick closing valve block B assembly; 16: pressure before the third valve; 17: third quick closing solenoid valve; 1 8: Pressure before the fourth valve; 19: Fourth quick-closing solenoid valve; 20: Oil return pipeline of quick-closing valve block A assembly; 21: Oil return pipeline of quick-closing valve block B assembly; 22: Nitrogen air pressure valve block assembly; 23: Nitrogen tank pressure; 24: Nitrogen tank; 25: First open position limit switch; 26: First 90% valve position limit switch; 27: First closed position limit switch; 28: Second open position limit switch; 29: Second 90% valve position limit switch; 30: Second closed position limit switch; 31: Bracket; 32: Main valve. DETAILED DESCRIPTION

[0048] In order to further understand the present invention, the embodiments of the present invention 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 invention, rather than limiting the present invention.

[0049] The embodiment of the present invention discloses a control device for a nuclear power plant industrial steam supply rapid isolation device, such as Figure 1 As shown, it includes: a nitrogen gas pressure valve block assembly 22, a slow closing valve block assembly 2, a fast closing valve block A assembly 10, a fast closing valve block B assembly 15, and a hydraulic oil assembly 6;

[0050] The hydraulic oil assembly 6 includes a hydraulic oil pump 7 and an oil tank;

[0051] The hydraulic oil in the hydraulic oil assembly 6 is delivered to the oil supply line in the slow closing module assembly 2 through the hydraulic oil pump 7. One line is connected to the lower part of the accumulator 1 to assist in energy storage; the other line is connected to the lower cavity of the driving mechanism through the hydraulic oil supply / return pipeline 9 to provide hydraulic oil and recover hydraulic oil when the rapid isolation device is put into operation and shut down;

[0052] A slow closing solenoid valve 5 is provided on the hydraulic oil supply / return pipeline in the slow closing module assembly 2; a slow closing solenoid valve front pressure gauge 4 is provided in front of the slow closing solenoid valve 5; a check valve 3 is provided in the slow closing module assembly 2;

[0053] The quick-closing valve block A component 10 and the quick-closing valve block B component 15 are redundant circuits, one end of which is connected to the lower cavity of the driving mechanism, and the other end is connected to the oil tank through the oil return pipeline;

[0054] Two fast-closing solenoid valves are respectively arranged in the fast-closing valve block A component 10, namely: a first fast-closing solenoid valve 12 and a second fast-closing solenoid valve 14; a first valve front pressure gauge 11 is arranged before the first fast-closing solenoid valve 12, and a second valve front pressure gauge 13 is arranged before the second fast-closing solenoid valve 14;

[0055] Two fast-closing solenoid valves are respectively arranged in the fast-closing valve block B assembly 15, namely a third fast-closing solenoid valve 17 and a fourth fast-closing solenoid valve 19; a third valve front pressure gauge 16 is arranged before the third fast-closing solenoid valve 17, and a fourth valve front pressure gauge 18 is arranged before the fourth fast-closing solenoid valve 19;

[0056] One end of the nitrogen pressure valve block assembly 22 is connected to the accumulator 1 through the nitrogen pipeline 8, and the other end is connected to the nitrogen tank 24; one of the functions of the nitrogen pressure valve block assembly 22 is to monitor the nitrogen pressure of the nitrogen tank 24, the second function is to provide an interface for replenishing nitrogen to the nitrogen tank 24, and the third function is to be connected to the accumulator 1 through the nitrogen pipeline 8 to realize the normal design function of high-pressure nitrogen.

[0057] Open limit switch, close limit switch, 90% of valve position limit switches are set with two, which are redundant to each other;

[0058] Two open limit switches, two closed limit switches, and two 90% valve position limit switches are installed on the actuator bracket according to the valve stem stroke to represent the valve opening state;

[0059] The signals of the first open limit switch and the first closed limit switch are connected to the DCS control system of the nuclear power unit, and the signals of the second open limit switch and the second closed limit switch are connected to the DCS control system of the industrial steam thermal control room;

[0060] The main valve 32 is installed in the main pipe of the secondary circuit main steam leading to the industrial steam conversion equipment, and performs the switching function according to the control instruction.

[0061] The embodiment of the present invention also discloses a control method for a nuclear power plant industrial steam supply rapid isolation device, comprising the following steps:

[0062] Step S1: putting the rapid isolation device into operation;

[0063] Specifically include:

[0064] On the OM screen in the control room, put the input control module of the rapid isolation device into the input state, and it will be automatically cut off after 2 seconds;

[0065] The input port indicative of the input state in the control module outputs a command signal;

[0066] According to the command signal, the solenoid valves of the oil return pipeline are closed, the solenoid valves comprising: a first fast-closing solenoid valve 12, a second fast-closing solenoid valve 14, a third fast-closing solenoid valve 17 and a fourth fast-closing solenoid valve 19;

[0067] Start the hydraulic oil pump 7, and the hydraulic oil enters the lower cavity of the valve drive mechanism through the oil supply / return pipe 9. As the hydraulic oil pressure continues to increase, the nitrogen pressure in the upper cavity of the valve drive mechanism and the weight of the valve body are offset, and the main valve 32 slowly opens until the open limit fast closing is triggered, and the main valve 32 opens.

[0068] Step S2: Activate the automatic start and stop control function of the hydraulic oil pump to maintain the normal operation of the rapid isolation device;

[0069] Specifically include:

[0070] The automatic start and stop control logic of the hydraulic oil pump 7 is put into use to keep the oil pressure in the normal range. When the hydraulic oil pressure in the hydraulic oil supply pipeline is less than 32.5MPa and the hydraulic oil pump 7 is in a stopped state, the hydraulic oil pump 7 starts automatically; when the hydraulic oil pressure in the hydraulic oil supply pipeline is greater than 34.2MPa and the hydraulic oil pump 7 is in a running state, the hydraulic oil pump 7 stops automatically; in addition, if the hydraulic oil pump 7 runs continuously for more than 7 minutes, the continuous operation alarm is triggered to prompt the operator to pay attention to the status of the hydraulic oil pump and pipeline.

[0071] Step S3: During the normal operation of the rapid isolation device, the activity test is performed to verify whether the mechanical part is stuck, and the quick closing solenoid valve performance is verified through a quick closing test; the quick closing function of the rapid isolation device is realized by two mutually redundant quick closing circuits, namely the quick closing valve block A component and the quick closing valve block B component, and the quick closing tests of the two sets of quick closing valve block components are performed separately; each set of quick closing valve block components is designed with two quick closing solenoid valves, and a series pressure measuring point is set in front of each quick closing solenoid valve, and the two solenoid valve action tests are performed in sequence;

[0072] The activity test is a 90% opening activity test.

[0073] The 90% opening activity test specifically includes:

[0074] On the OM screen of the control room, the input control module of the 90% opening activity test is placed in the input state, and it is automatically cut off after 2 seconds; when the first opening limit switch 25 is in the triggered state and the first 90% valve position limit switch 26 is in the untriggered state, the 90% opening activity test action instruction is automatically generated;

[0075] After the 90% opening activity test action instruction is issued, the hydraulic oil pump 7 stops running, the slow closing solenoid valve 5 is powered on and opened, the hydraulic oil is depressurized through the hydraulic oil supply / return pipeline 9, and the main valve 32 is slowly closed under the nitrogen pressure of the upper cavity of the valve drive mechanism and the valve body's own weight; when the first 90% valve position limit switch 26 is triggered or the 90% opening activity test action instruction lasts for 20 seconds, a 90% opening activity test end signal is generated; after the 90% opening activity test end instruction is issued, the hydraulic oil pump 7 starts, the slow closing solenoid valve 5 is powered off and closed, the hydraulic oil is pressurized through the hydraulic oil supply / return pipeline 9, and as the hydraulic oil pressure continues to increase, the nitrogen pressure of the upper cavity of the valve drive mechanism and the valve body's own weight are offset, the main valve 32 slowly opens until the first opening limit switch 25 is triggered, and the test ends.

[0076] In the 90% opening activity test, the open position limit switch and the 90% valve position limit switch may also be the second 90% valve position limit switch and the second open position limit switch to perform corresponding actions.

[0077] The quick closing test specifically includes: placing the input / removal control module of the quick closing valve block A component in the input state on the OM screen of the control room, and automatically removing it after 2 seconds; if the pressure in front of the second quick closing solenoid valve 14 in the quick closing valve block component is greater than 20MPa, the first quick closing solenoid valve 12 is in the opening condition, and at this time, the first quick closing solenoid valve 12 is powered on and opened; if the pressure in front of the first quick closing solenoid valve 12 is less than 3MPa within 30 seconds, a test success signal of the first quick closing solenoid valve 12 is generated, and at the same time, the first quick closing solenoid valve 12 loses power and closes; after the first quick closing solenoid valve 12 is tested successfully, the second quick closing solenoid valve 14 is generated The test signal starts. If the pressure before the first quick-closing solenoid valve 12 is greater than 20MPa, the second quick-closing solenoid valve 14 is ready to open. At this time, the second quick-closing solenoid valve 14 is powered on and opened. If the pressure before the second quick-closing solenoid valve 14 is less than 3MPa within 30 seconds, a test success signal of the second quick-closing solenoid valve 14 is generated, and the second quick-closing solenoid valve 14 is powered off and closed. If the tests of the two solenoid valves are successful, it indicates that the quick-closing test of the quick-closing valve block A component is successful, otherwise it indicates that the quick-closing test of the quick-closing valve block A component has failed. The test failure signal issues a command to automatically close the first quick-closing solenoid valve 12 and the second quick-closing solenoid valve 14.

[0078] Test the quick-closing valve block B assembly in the same way.

[0079] Step S4: Normally shut down the rapid isolation device or rapidly shut down the rapid isolation device;

[0080] The normal shutdown specifically includes:

[0081] On the OM screen of the control room, the input control module of the rapid isolation device is placed in the input state, and it is automatically cut off after 2 seconds; the output port representing the input state in the control module outputs a 2-second command signal, opens the slow-closing solenoid valve 5, stops the hydraulic oil pump 7, and the hydraulic oil flows back to the oil tank under the action of nitrogen pressure and the deadweight of the valve body, and the main valve 32 slowly closes to the closed position.

[0082] Both the safety instrumentation and control system and the normal operation instrumentation and control system can independently realize the quick closing function of the rapid isolation device according to the radioactive leakage monitoring signal.

[0083] For example, when a major breach occurs in which the primary circuit medium leaks into the secondary circuit, the main steam gamma dose rate instrument of the nuclear power plant sends a threshold signal, and the safety instrumentation and control system generates a fast-closing command through logic voting, thus realizing the fast-closing function of the fast isolation device.

[0084] When a small breach occurs in which the primary circuit medium leaks into the secondary circuit, the main steam N16 monitoring instrument of the nuclear power plant sends a threshold signal, and the logic of the normal operation instrumentation and control system votes to generate a fast-closing command, thus realizing the fast-closing function of the fast isolation device;

[0085] The rapid shutdown specifically includes:

[0086] The safety instrumentation and control system or the normal operation instrumentation and control system logic votes to generate a quick closing command, and the quick closing solenoid valves in the two sets of quick closing valve block assemblies are energized and opened at the same time, the oil pressure in the lower cavity of the valve drive mechanism drops rapidly, and the main valve 32 is quickly closed under the dual pressure of nitrogen pressure and deadweight, and the time is less than 5 seconds.

[0087] The normal operation, shutdown, activity test, and quick-off test of the rapid isolation device of the present invention all realize the innovative design of one-button functional verification, effectively reducing the risk of human error and unexpected equipment operation. The innovative design and implementation of a set of digital control methods for rapid isolation devices fills the technical gap in the field of industrial nuclear energy steam supply.

[0088] The above embodiments are only used to help understand the method and core idea of ​​the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

[0089] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A control method for a nuclear power plant industrial steam supply rapid isolation device, characterized in that: The following steps are involved: Step S1: putting the rapid isolation device into operation; Step S2: Activate the automatic start and stop control function of the hydraulic oil pump to maintain the normal operation of the rapid isolation device; Step S3: During the normal operation of the rapid isolation device, the activity test is performed to verify whether the mechanical part is stuck, and the quick closing solenoid valve performance is verified through a quick closing test; the quick closing function of the rapid isolation device is realized by two mutually redundant quick closing circuits, namely the quick closing valve block A component and the quick closing valve block B component, and the quick closing tests of the two sets of quick closing valve block components are performed separately; each set of quick closing valve block components is designed with two quick closing solenoid valves, and a series pressure measuring point is set in front of each quick closing solenoid valve, and the two solenoid valve action tests are performed in sequence; Step S4: Normally shut down the rapid isolation device or rapidly shut down the rapid isolation device; The safety instrumentation and control system and the normal operation instrumentation and control system independently control the rapid isolation device to achieve rapid shutdown.

2. The control method of the nuclear power plant industrial steam supply rapid isolation device according to claim 1 is characterized in that: The step S1 specifically includes: After the DCS control system issues a command to put the rapid isolation device into operation, the solenoid valve of the pressure relief line is closed according to the command signal, the hydraulic oil pump is started, and the hydraulic oil enters the lower cavity of the valve drive mechanism through the oil supply pipeline. As the hydraulic oil pressure continues to increase, the nitrogen pressure in the upper cavity of the valve drive mechanism and the weight of the valve body are offset, and the main valve slowly opens to the open position.

3. The control method of the nuclear power plant industrial steam supply rapid isolation device according to claim 1 is characterized in that: The step S2 specifically includes: On the OM screen of the control room, the control module for the automatic start and stop function of the hydraulic oil pump is placed in the engaged state; when the hydraulic oil pressure in the hydraulic oil supply pipeline is less than 32.5MPa and the hydraulic oil pump is in a stopped state, the hydraulic oil pump is automatically started; when the hydraulic oil pressure in the hydraulic oil supply pipeline is greater than 34.2MPa and the hydraulic oil pump is in a running state, the hydraulic oil pump is automatically stopped; in addition, if the hydraulic oil pump runs continuously for more than 7 minutes, the continuous operation alarm is triggered to prompt the operator to pay attention to the status of the hydraulic oil pump and pipeline.

4. The control method of the nuclear power plant industrial steam supply rapid isolation device according to claim 1 is characterized in that: In the step S3, the activity test is a 90% opening activity test.

5. The control method of the nuclear power plant industrial steam supply rapid isolation device according to claim 4 is characterized in that: The 90% opening activity test specifically includes: After the DCS control system issues a test permission command, if the open position limit switch is triggered and the 90% valve position limit switch is not triggered, a 90% opening activity test action command is generated; After the 90% opening activity test action command is issued, the hydraulic oil pump stops, the slow closing solenoid valve is powered on and opened, the hydraulic oil is depressurized through the hydraulic oil supply / return pipeline, and the main valve is slowly closed under the nitrogen pressure in the upper cavity of the valve drive mechanism and the weight of the valve body; when the 90% valve position limit switch is triggered or the 90% opening activity test action command continues for a period of time, a 90% opening activity test end signal is generated; after the 90% opening activity test end command is issued, the hydraulic oil pump starts, the slow closing solenoid valve is powered off and closed, and the hydraulic oil is pressurized through the hydraulic oil supply / return pipeline. As the hydraulic oil pressure continues to increase, the nitrogen pressure in the upper cavity of the valve drive mechanism and the weight of the valve body are offset, and the main valve slowly opens until the open position limit switch is triggered, and the test ends.

6. The control method of the nuclear power plant industrial steam supply rapid isolation device according to claim 1, characterized in that: The quick closing test specifically includes: after the DCS control system issues a test permission instruction, if the pressure in front of the second solenoid valve in the quick closing valve block assembly is greater than 20MPa, the first solenoid valve meets the opening condition, and at this time the first solenoid valve is powered on and opened. If the pressure in front of the first solenoid valve is less than 3MPa within 30 seconds, a first solenoid valve test success signal is generated, and the first solenoid valve is powered off and closed; after the first solenoid valve test is successful, a second solenoid valve start test signal is generated. If the pressure in front of the first solenoid valve is greater than 20MPa, the second solenoid valve meets the opening condition, and at this time the second solenoid valve is powered on and opened. If the pressure in front of the second solenoid valve is less than 3MPa within 30 seconds, a second solenoid valve test success signal is generated, and the second solenoid valve is powered off and closed; if the tests of the two solenoid valves are successful, it indicates that the quick closing test of the quick closing valve block A assembly is successful, otherwise it indicates that the quick closing test of the quick closing valve block A assembly has failed; Test the quick-closing valve block B assembly in the same way.

7. The control method of the nuclear power plant industrial steam supply rapid isolation device according to claim 1, characterized in that: In step S4, the normal shutdown specifically includes: After the DCS control system issues a command to shut down the rapid isolation device normally, it opens the slow-closing solenoid valve, shuts down the hydraulic oil pump, and the hydraulic oil flows back to the oil tank under the action of nitrogen pressure and the deadweight of the valve body, and the main valve slowly closes to the closed position.

8. The control method of the nuclear power plant industrial steam supply rapid isolation device according to claim 4 is characterized in that: In step S4, the rapid shutdown specifically includes: The safety instrumentation and control system or the normal operation instrumentation and control system logic votes to generate a quick-closing command. The quick-closing solenoid valves in the two sets of quick-closing valve block assemblies are energized and opened at the same time. The oil pressure in the lower cavity of the valve drive mechanism drops rapidly, and the main valve closes quickly under the dual pressure of nitrogen pressure and deadweight.

9. A control device for a rapid isolation device for industrial steam supply in a nuclear power plant, characterized in that: include: A nitrogen gas pressure valve block assembly (22), a slow closing valve block assembly (2), a quick closing valve block A assembly (10), a quick closing valve block B assembly (15), and a hydraulic oil assembly (6); The hydraulic oil assembly (6) comprises a hydraulic oil pump (7) and an oil tank; The hydraulic oil in the hydraulic oil assembly (6) is transported to the oil supply pipeline in the slow-closing module assembly (2) through a hydraulic oil pump (7), one of which is connected to the lower part of the accumulator (1) to assist in energy storage; the other is connected to the lower cavity of the drive mechanism through a hydraulic oil supply / return pipeline to provide hydraulic oil and recover hydraulic oil when the rapid isolation device is put into operation or stopped; A slow-closing solenoid valve is provided on the hydraulic oil supply / return pipeline in the slow-closing module assembly (2); The quick-closing valve block A component (10) and the quick-closing valve block B component (15) are redundant circuits, one end of which is connected to the lower cavity of the drive mechanism, and the other end is connected to the oil tank through an oil return pipeline; Two fast-closing solenoid valves are respectively arranged in the fast-closing valve block A component (10). Two fast-closing solenoid valves are respectively arranged in the fast-closing valve block B component (15). One end of the nitrogen pressure valve block assembly (22) is connected to the accumulator (1) through a nitrogen pipeline (8), and the other end is connected to a nitrogen tank (24); Open limit switch, close limit switch, 90% of valve position limit switches are set with two, which are redundant to each other; Two open limit switches, two closed limit switches, and two 90% valve position limit switches are installed on the actuator bracket according to the valve stem stroke to represent the valve opening state; The signals of the first open limit switch and the first closed limit switch are connected to the DCS control system of the nuclear power unit, and the signals of the second open limit switch and the second closed limit switch are connected to the DCS control system of the industrial steam thermal control room; The main valve (32) is installed in the main pipe of the secondary circuit main steam leading to the industrial steam conversion equipment, and performs the switch function according to the control instruction.

10. The control device for the rapid isolation device for industrial steam supply in a nuclear power plant according to claim 9, characterized in that: A pressure gauge is set before each fast-closing solenoid valve, and a pressure gauge is set before each slow-closing solenoid valve.

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