A positioner system adapted to a nuclear power plant main feedwater flow control valve

Abstract

The application discloses a positioner system suitable for a main feed water flow regulating valve of a nuclear power station, relates to the field of nuclear power, and comprises a main positioner, a backup positioner, a first air guide pipeline, a second air guide pipeline, a third air guide pipeline, a three-way switch valve, a first filter pressure reducing valve, a second filter pressure reducing valve and a nuclear power unit heat exchange controller. The nuclear power unit heat exchange controller is used for monitoring and controlling the main positioner, the backup positioner and the three-way switch valve electrically connected to the nuclear power unit heat exchange controller, so that the main positioner and the backup positioner are backup to each other, the operation reliability of the positioner suitable for the main feed water flow regulating valve of the nuclear power station is improved, and the first filter pressure reducing valve and the second filter pressure reducing valve are configured to reduce the pressure of input gas of the main positioner and the backup positioner and filter possible foreign matters, so that the operation reliability of the main positioner and the backup positioner is improved. It can be seen that the application improves the operation reliability of the positioner suitable for the main feed water flow regulating valve of the nuclear power station.

Description

Technical Field

[0001] This application relates to the field of nuclear power technology, and in particular to a positioner system adapted to the main feedwater flow regulating valve of a nuclear power plant. Background Technology

[0002] During the operation of a nuclear power unit, the feedwater regulating valve positioner (hereinafter referred to as the positioner) of the main feedwater flow control system plays a key role, and its reliable operation is crucial for maintaining the stability of the evaporator water level in the nuclear power unit.

[0003] However, since the existing main feedwater flow control system is only equipped with a single positioner, and the positioner operates in a harsh environment, the reliability of the existing positioner is low, which seriously affects the safe operation of the nuclear power unit. Utility Model Content

[0004] In view of the above problems, this application provides a positioner system adapted to the main feedwater flow regulating valve of a nuclear power plant, so as to improve the operational reliability of the positioner adapted to the main feedwater flow regulating valve of a nuclear power plant. The specific solution is as follows:

[0005] The first aspect of this application provides a positioner system adapted to the main feedwater flow regulating valve of a nuclear power plant, comprising:

[0006] Main positioner, backup positioner, first gas guide line, second gas guide line, third gas guide line, three-way switching valve, first filter pressure reducing valve, second filter pressure reducing valve, and nuclear power unit heat exchange controller.

[0007] The inlets of both the first and second filter pressure reducing valves are connected to the outlet of the valve drive gas source of the nuclear power unit. The outlet of the first filter pressure reducing valve is connected to the gas input end of the main positioner, and the outlet of the second filter pressure reducing valve is connected to the gas input end of the backup positioner. The gas output end of the main positioner is connected to the first inlet of the three-way switching valve through the first gas guide pipe. The gas output end of the backup positioner is connected to the second inlet of the three-way switching valve through the second gas guide pipe. The outlet of the three-way switching valve is connected to the coupling inlet of the main feedwater flow regulating valve of the nuclear power unit through the third gas guide pipe.

[0008] The nuclear power unit heat exchange controller is electrically connected to the main positioner, the backup positioner and the three-way switching valve respectively;

[0009] When the main positioner fails, the three-way switching valve closes the first air inlet and opens the second air inlet. When the backup positioner fails, the three-way switching valve closes the second air inlet and opens the first air inlet.

[0010] In one possible implementation, the primary locator and the backup locator are locators equipped with inductive magnetic strips.

[0011] In one possible implementation, the inductive magnetic strip is mounted to the surface of the rotating component of the coupling by a fixing bolt, the fixing bolt being equipped with a spring washer.

[0012] In one possible implementation, the positioner system adapted to the main feedwater flow regulating valve of a nuclear power plant further includes:

[0013] The main filter pressure reducing valve has its inlet connected to the outlet of the valve drive gas source of the nuclear power unit, its first outlet connected to the inlet of the first filter pressure reducing valve, and its second outlet connected to the inlet of the second filter pressure reducing valve. The maximum filtration particle size of the main filter pressure reducing valve is greater than that of the first filter pressure reducing valve, and the maximum filtration particle size of the main filter pressure reducing valve is greater than that of the second filter pressure reducing valve.

[0014] In one possible implementation, the positioner system adapted to the main feedwater flow regulating valve of a nuclear power plant further includes:

[0015] At least one electromagnetic on / off valve is connected in series in the third gas pipeline and is electrically connected to the nuclear power unit heat exchange controller.

[0016] In one possible implementation, the positioner system adapted to the main feedwater flow regulating valve of a nuclear power plant further includes:

[0017] A flow amplifier is connected in series in the third air guide line between the electromagnetic on / off valve and the coupling, and the auxiliary air inlet of the flow amplifier is connected to the third air outlet of the main filter pressure reducing valve.

[0018] The flow amplifier is electrically connected to the nuclear power unit heat exchange controller.

[0019] In one possible implementation, the positioner system adapted to the main feedwater flow regulating valve of a nuclear power plant further includes:

[0020] A quick exhaust valve, wherein the quick exhaust valve is connected in series in the third air guide line between the electromagnetic on / off valve and the coupling;

[0021] The rapid exhaust valve is electrically connected to the nuclear power unit heat exchange controller.

[0022] In one possible implementation, the positioner system adapted to the main feedwater flow regulating valve of a nuclear power plant further includes:

[0023] A positioner bracket is mounted on the valve body of the three-way switching valve by fixing bolts. The fixing bolts are equipped with spring washers. The main positioner and the backup positioner are fixedly mounted on the mounting plane of the positioner bracket.

[0024] In one possible implementation, the first filter pressure reducing valve and the main positioner are connected by a fixing device, which includes a nut, a screw, and an anti-slip washer.

[0025] In one possible implementation, the second filter pressure reducing valve and the backup positioner are connected by a fixing device, which includes a nut, a screw, and an anti-slip washer.

[0026] By employing the above technical solution, this application provides a positioner system adapted to the main feedwater flow regulating valve of a nuclear power plant. Through the configuration of a nuclear power unit heat exchange controller electrically connected to the main positioner, backup positioner, and three-way switching valve, it achieves the acquisition of the operating status of the main and backup positioners, as well as the control of the three-way switching valve. Subsequently, by configuring the gas output end of the main positioner to be connected to the first air inlet of the three-way switching valve through a first air guide pipe, the gas output end of the backup positioner to be connected to the second air inlet of the three-way switching valve through a second air guide pipe, and the air outlet of the three-way switching valve to be connected to the air inlet end of the coupling of the main feedwater flow regulating valve through a third air guide pipe, the system is configured such that, in the event of a main positioner failure, the three-way switching valve closes the first air inlet and opens the second air inlet; and in the event of a backup positioner failure, the three-way switching valve closes the second air inlet and opens the first air inlet. This ensures that the main and backup positioners serve as backups for each other, improving the operational reliability of the positioner system adapted to the main feedwater flow regulating valve of a nuclear power plant. Finally, by configuring the inlets of both the first and second filter pressure reducing valves to be connected to the outlet of the valve drive gas source of the nuclear power unit, the outlet of the first filter pressure reducing valve to be connected to the gas input end of the main positioner, and the outlet of the second filter pressure reducing valve to be connected to the gas input end of the backup positioner, the first filter pressure reducing valve is used to reduce and filter the gas input to the main positioner, and the second filter pressure reducing valve is used to reduce and filter the gas input to the backup positioner. This avoids the decrease in accuracy caused by high-pressure gas impacting the main and backup positioners, and avoids the risk of reduced operational reliability caused by foreign objects in the gas clogging the positioners, thereby improving the operational reliability of the main and backup positioners. Attached Figure Description

[0027] The above and other features, advantages, and aspects of the embodiments of this disclosure will become more apparent from the accompanying drawings and the following detailed description. Throughout the drawings, the same or similar reference numerals denote the same or similar elements. It should be understood that the drawings are schematic, and the originals and elements are not necessarily drawn to scale.

[0028] Figure 1A schematic diagram of the connection relationship of a positioner system adapted to the main feedwater flow regulating valve of a nuclear power plant, provided for this application;

[0029] Figure 2 A schematic diagram of the connection relationship of another positioner system adapted to the main feedwater flow regulating valve of a nuclear power plant, provided in this application. Detailed Implementation

[0030] The embodiments of this application are described below with reference to the accompanying drawings. The terminology used in the implementation section of this application is for explaining specific embodiments only and is not intended to limit the scope of this application.

[0031] The embodiments of this application will now be described with reference to the accompanying drawings. Those skilled in the art will recognize that, with technological advancements and the emergence of new scenarios, the technical solutions provided in the embodiments of this application are equally applicable to similar technical problems.

[0032] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms are interchangeable where appropriate; this is merely a way of distinguishing objects with the same attributes in the embodiments of this application. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion, so that a process, method, system, product, or apparatus that comprises a series of elements is not necessarily limited to those elements but may include other elements not explicitly listed or inherent to those processes, methods, products, or apparatuses.

[0033] The first aspect of this application provides a positioner system adapted to the main feedwater flow regulating valve of a nuclear power plant, such as... Figure 1 As shown, the positioner system adapted to the main feedwater flow regulating valve of a nuclear power plant includes:

[0034] The system includes a main positioner 11, a backup positioner 12, a first gas guide line 13, a second gas guide line 14, a third gas guide line 15, a three-way switching valve 16, a first filter pressure reducing valve 17, a second filter pressure reducing valve 18, and a nuclear power unit heat exchange controller 19.

[0035] The air inlets of the first filter pressure reducing valve 17 and the second filter pressure reducing valve 18 are both connected to the air outlet of the valve drive air source of the nuclear power unit. The air outlet of the first filter pressure reducing valve 17 is connected to the gas input end of the main positioner 11, and the air outlet of the second filter pressure reducing valve 18 is connected to the gas input end of the backup positioner 12. The gas output end of the main positioner 11 is connected to the first air inlet of the three-way switching valve 16 through the first air guide pipe 13. The gas output end of the backup positioner 12 is connected to the second air inlet of the three-way switching valve 16 through the second air guide pipe 14. The air outlet of the three-way switching valve 16 is connected to the coupling air inlet of the main feedwater flow regulating valve of the nuclear power unit through the third air guide pipe 15.

[0036] The nuclear power unit heat exchange controller 19 is electrically connected to the main positioner 11, the backup positioner 12 and the three-way switching valve 16 respectively;

[0037] When the main positioner 11 fails, the three-way switching valve 16 closes the first air inlet and opens the second air inlet. When the backup positioner 12 fails, the three-way switching valve 16 closes the second air inlet and opens the first air inlet.

[0038] It should be noted that, in practical applications, the aforementioned first filter pressure reducing valve 17 and second filter pressure reducing valve 18 are valve devices used to ensure pressure stability and filter foreign matter in the medium. Since the valve drive gas source for nuclear power units needs to drive a large number of valves of different types in the nuclear power unit's supporting system, the output gas of the nuclear power unit's valve drive gas source is usually high-pressure gas after high-pressure pressurization to provide sufficient driving force. Valve positioners (the aforementioned main positioner 11 and backup positioner 12) require high-precision gas regulation. Direct entry of high-pressure gas into the valve positioner will impact its internal structure, and prolonged impact will severely affect the control accuracy and operational reliability of the valve positioner. Furthermore, the high-pressure gas output from the nuclear power unit's valve drive gas source may contain foreign matter such as rust, particulate matter, and water droplets, which are highly likely to clog or damage the valve positioner, thereby reducing its operational reliability. Therefore, this application configures the inlets of the first filter pressure reducing valve 17 and the second filter pressure reducing valve 18 to be connected to the outlet of the valve drive gas source of the nuclear power unit. The outlet of the first filter pressure reducing valve 17 is connected to the gas input end of the main positioner 11, and the outlet of the second filter pressure reducing valve 18 is connected to the gas input end of the backup positioner 12. This reduces the pressure and filters foreign matter from the gas entering the main positioner 11 and the backup positioner 12, thereby improving the operational reliability of the positioner system.

[0039] It should be noted that, in practical applications, the aforementioned main positioner 11 and backup positioner 12 can be valve positioners selected based on the flow regulation accuracy of the nuclear power unit's heat exchange system. Existing nuclear power unit heat exchanger systems typically employ a single valve positioner configuration, considering power supply reliability and the relatively mature nature of existing valve positioners. However, valve positioners still pose a risk of failure under harsh operating environments, aging, and product quality control factors. A single valve positioner configuration means that when the valve positioner fails, the main feedwater flow regulating valve of the nuclear power unit's heat exchange system will be unable to properly control the water flow, leading to evaporator water level instability and, in severe cases, the risk of reactor tripping. In such situations, existing technologies typically require suspending the nuclear power unit's operation and replacing the valve positioner, but the start-up and shutdown time of the nuclear power unit is excessively long, severely impacting power generation efficiency. Therefore, this application configures the gas output end of the main positioner 11 to be connected to the first inlet of the three-way switching valve 16 through the first gas guide pipe 13, and the gas output end of the backup positioner 12 to be connected to the second inlet of the three-way switching valve 16 through the second gas guide pipe 14. It is configured such that when the main positioner 11 fails, the three-way switching valve 16 closes the first inlet and opens the second inlet; when the backup positioner 12 fails, the three-way switching valve 16 closes the second inlet and opens the first inlet. Thus, the main positioner 11 and the backup positioner 12 serve as backups for each other. When one positioner fails, the gas flow path is changed by controlling the three-way switching valve, thereby ensuring the safe and stable operation of the nuclear power unit.

[0040] It should be noted that, in practical applications, the aforementioned nuclear power unit heat exchange controller 19 can be a controller in a distributed control system (DCS) used to control the heat exchange system in a nuclear power unit. The aforementioned nuclear power unit heat exchange controller 19 can monitor the operating status of the main positioner 11 and the standby positioner 12, which are electrically connected to it, based on its internal control program. When either positioner fails, it controls the three-way switching valve 16, which is electrically connected to it, to open or close the corresponding air inlet.

[0041] In one possible implementation, to further improve operational reliability, the electrical connection channels between the main positioner 11 and the nuclear power unit heat exchange controller 19, and the electrical connection channels between the backup positioner 12 and the nuclear power unit heat exchange controller 19, can be located on different control boards of the nuclear power unit heat exchange controller 19. This achieves physical-level communication isolation, avoids mutual interference, and improves operational reliability. The electrical connection channels of the three-way switching valve 16 can be connected to different boards respectively to avoid the risk of untimely response due to failure of any board.

[0042] In one possible implementation, the models of the first filter pressure reducing valve 17 and the second filter pressure reducing valve 18 can be compatible with the models of the main positioner 11 and the backup positioner 12. For example, if the main positioner 11 and the backup positioner 12 are DVC6200PD model positioners, then the first filter pressure reducing valve 17 and the second filter pressure reducing valve 18 can be pre-fitted 67CFR model filter pressure reducing valves to further improve compatibility and operational reliability.

[0043] In one possible implementation, the model of the three-way switching valve 16 can also be a model compatible with the models of the main positioner 11 and the backup positioner 12. For example, if the main positioner 11 and the backup positioner 12 are DVC6200PD model positioners, then the three-way switching valve 16 can be a two-position three-way solenoid valve of model V3012I10.

[0044] This application configures the nuclear power unit heat exchange controller to be electrically connected to the main positioner, the backup positioner, and the three-way switching valve, respectively, thereby enabling the acquisition of the operating status of the main and backup positioners and the control of the three-way switching valve. Subsequently, the gas output of the main positioner is connected to the first air inlet of the three-way switching valve via a first air guide pipe, the gas output of the backup positioner is connected to the second air inlet of the three-way switching valve via a second air guide pipe, and the air outlet of the three-way switching valve is connected to the air inlet of the coupling of the main feedwater flow regulating valve via a third air guide pipe. The system is configured such that, in the event of a main positioner failure, the three-way switching valve closes the first air inlet and opens the second air inlet; conversely, in the event of a backup positioner failure, the three-way switching valve closes the second air inlet and opens the first air inlet. This ensures that the main and backup positioners serve as backups for each other, improving the operational reliability of the positioner system adapted to the main feedwater flow regulating valve of a nuclear power plant. Finally, by configuring the inlets of both the first and second filter pressure reducing valves to be connected to the outlet of the valve drive gas source of the nuclear power unit, the outlet of the first filter pressure reducing valve to be connected to the gas input end of the main positioner, and the outlet of the second filter pressure reducing valve to be connected to the gas input end of the backup positioner, the first filter pressure reducing valve is used to reduce and filter the gas input to the main positioner, and the second filter pressure reducing valve is used to reduce and filter the gas input to the backup positioner. This avoids the decrease in accuracy caused by high-pressure gas impacting the main and backup positioners, and avoids the risk of reduced operational reliability caused by foreign objects in the gas clogging the positioners, thereby improving the operational reliability of the main and backup positioners.

[0045] In one possible implementation, the primary locator and the backup locator 12 are locators configured with inductive magnetic strips.

[0046] It should be noted that in practical applications, the valve positioners used in existing technologies are typically mechanical cam positioners or contact potentiometer positioners. Their working principle involves converting the stroke of the mechanical cam or the potential generated by the potentiometer into an electrical signal, and then determining the positioner's opening control signal based on this signal. However, because mechanical cam positioners or contact potentiometer positioners rely on the relative movement of moving parts to generate the corresponding signal, and because the adjustment frequency of nuclear power plant heat exchange systems is high, this leads to wear on the mechanical structure as the positioner is used over time, affecting its operational accuracy and reliability. Furthermore, the operating environment of nuclear power plant heat exchange systems is subject to interference factors such as dust, humidity, and vibration, causing existing positioners to be prone to problems such as mechanical loosening due to vibration, poor contact due to dust intrusion, and corrosion due to humidity, all of which affect the positioner's operational reliability. Positioners equipped with inductive magnetic strips, on the other hand, have the characteristics of independent sealing and no contact between parts, thus avoiding the impact of dust and humidity interference factors on the positioner's operational reliability and accuracy. Meanwhile, since the positioner equipped with the magnetic strip determines its relative position by sensing the magnetic field strength, this process is unaffected by vibration and mechanical wear. Therefore, this application configures both the main positioner and the backup positioner 12 as positioners equipped with magnetic strips. By utilizing the independent sealing and non-contact characteristics of the magnetic strip, the impact of external interference factors on the operational reliability and accuracy of the positioner is avoided, thus improving the operational reliability of the positioner in the positioner system adapted to the main feedwater flow regulating valve of a nuclear power plant.

[0047] In one possible implementation, the inductive magnetic strip is mounted to the surface of the rotating component of the coupling by a fixing bolt, which is equipped with a spring washer.

[0048] It should be noted that, in practical applications, the working principle of the positioner equipped with the magnetic strip is as follows: by installing the magnetic strip on the surface of the rotating part of the coupling, the magnetic sensor of the positioner detects the change in the magnetic field of the magnetic strip as the rotating part rotates, and the internal logic of the positioner converts the change in the magnetic field into an electrical signal, thereby determining the rotation angle of the coupling.

[0049] It should be noted that, in practical applications, this application configures the induction magnetic strip to be mounted on the surface of the rotating parts of the coupling using fixing bolts, in order to prevent the induction magnetic strip from being thrown off during rotation and affecting the operational reliability of the positioner. Simultaneously, by configuring the fixing bolts with spring washers, the interference of vibrations generated during coupling rotation on the magnetic field changes of the induction magnetic strip during rotation is further reduced, thereby improving the positioning accuracy of the positioner.

[0050] In one possible implementation, the positioner system adapted to the main feedwater flow regulating valve of a nuclear power plant provided in the first aspect of this application further includes:

[0051] The main filter pressure reducing valve has its inlet connected to the outlet of the valve drive gas source of the nuclear power unit. The first outlet of the main filter pressure reducing valve is connected to the inlet of the first filter pressure reducing valve 17, and the second outlet of the main filter pressure reducing valve is connected to the inlet of the second filter pressure reducing valve 18. The maximum filtration particle size of the main filter pressure reducing valve is greater than that of the first filter pressure reducing valve 17, and the maximum filtration particle size of the main filter pressure reducing valve is greater than that of the second filter pressure reducing valve 18.

[0052] It should be noted that, in practical applications, the maximum filtration particle size described above represents the size of foreign matter that the filter pressure reducing valve can filter. The larger the maximum filtration particle size, the larger the size of the foreign matter that the filter pressure reducing valve can filter. Since the valve drive gas source of a nuclear power unit needs to connect to a large number of start-up valves in various subsystems of the nuclear power unit, this can lead to the presence of foreign matter of different sizes and types (such as condensation, rust, and dust) in the gas pipelines connected to the nuclear power unit valve drive gas source. Under the action of the high-pressure gas output from the nuclear power unit valve drive gas source, these foreign matter are prone to adhesion during their movement within the pipeline, resulting in an increase in their size. When the size of the foreign matter is much larger than the maximum filtration particle size of the first filter pressure reducing valve 17 and the second filter pressure reducing valve 18, it will cause blockage failures in both valves, leading to the main positioner 11 and the backup positioner 12 failing to operate normally. Therefore, this application configures the inlet of the main filter pressure reducing valve to be connected to the outlet of the valve drive gas source of the nuclear power unit, the first outlet of the main filter pressure reducing valve to be connected to the inlet of the first filter pressure reducing valve 17, and the second outlet of the main filter pressure reducing valve to be connected to the inlet of the second filter pressure reducing valve 18. The maximum filtration particle size of the main filter pressure reducing valve is greater than that of the first filter pressure reducing valve 17 and the second filter pressure reducing valve 18. This allows the main filter pressure reducing valve to preferentially filter potentially larger foreign objects, thereby reducing the risk of blockage of the first filter pressure reducing valve 17 and the second filter pressure reducing valve 18, and thus improving the operational reliability of the positioner system.

[0053] In one possible implementation, the aforementioned main filter pressure reducing valve can also be replaced with a filter with a self-cleaning function, thereby achieving coarse filtration of high-pressure gas and self-cleaning of foreign matter.

[0054] In one possible implementation, the positioner system adapted to the main feedwater flow regulating valve of a nuclear power plant provided in the first aspect of this application further includes:

[0055] At least one electromagnetic on / off valve is connected in series in the third gas pipeline 15 and is electrically connected to the nuclear power unit heat exchange controller 19.

[0056] It should be noted that in practical applications, under special circumstances such as emergency reactor shutdown or positioner failure, it is necessary to prevent the main positioner 11 and / or the backup positioner 12 from further adjusting the opening of the main feedwater flow regulating valve. Therefore, this application configures an electromagnetic on / off valve to be connected in series in the third gas guide line 15, so that in an emergency, the electromagnetic on / off valve can be closed to terminate the adjustment of the main feedwater flow regulating valve opening by the main positioner 11 and / or the backup positioner 12, thereby improving the operational reliability of the nuclear power unit's heat exchange system.

[0057] In one possible implementation, the positioner system adapted to the main feedwater flow regulating valve of a nuclear power plant provided in the first aspect of this application further includes:

[0058] A flow amplifier is connected in series in the third air guide line 15 between the solenoid on / off valve and the coupling. The auxiliary air inlet of the flow amplifier is connected to the third air outlet of the main filter pressure reducing valve.

[0059] The flow amplifier is electrically connected to the nuclear power unit heat exchange controller 19.

[0060] It should be noted that in practical applications, since the coupling relies on the gas output from the main positioner 11 or the backup positioner 12 to drive the main feedwater flow regulating valve to adjust its opening, in situations such as partial blockage of the main positioner 11 or the backup positioner 12, or excessive load on the coupling, the gas output from the main positioner 11 or the backup positioner 12 alone is insufficient to drive the coupling. Therefore, this application configures a flow amplifier connected in series in the third air guide pipe 15 between the electromagnetic on / off valve and the coupling, and controls the opening of the auxiliary air inlet of the flow amplifier through the nuclear power unit heat exchange controller 19. Thus, when the output gas pressure is insufficient, the high-pressure gas output from the main filter pressure reducing valve is used to assist in driving the coupling, thereby improving the operational reliability of the positioner system.

[0061] In one possible implementation, the positioner system adapted to the main feedwater flow regulating valve of a nuclear power plant provided in the first aspect of this application further includes:

[0062] A quick exhaust valve is connected in series in the third air guide line 15 between the solenoid on / off valve and the coupling.

[0063] The quick exhaust valve is electrically connected to the nuclear power unit heat exchange controller 19.

[0064] It should be noted that in practical applications, when the main feedwater flow control valve needs to be shut off, the presence of high-pressure gas inside the coupling can impede its movement and reduce the shut-off rate of the main feedwater flow control valve. Therefore, this application configures a quick-release valve connected in series in the third air guide line 15 between the solenoid on / off valve and the coupling to quickly release the high-pressure gas inside the coupling when the main feedwater flow control valve is shut off, thereby improving the shut-off rate of the main feedwater flow control valve.

[0065] In one possible implementation, the positioner system adapted to the main feedwater flow regulating valve of a nuclear power plant provided in the first aspect of this application further includes:

[0066] The positioner bracket is installed on the valve body of the three-way switching valve 16 by fixing bolts. The fixing bolts are equipped with spring washers. The main positioner 11 and the backup positioner 12 are fixedly installed on the mounting plane of the positioner bracket.

[0067] It should be noted that in practical applications, the gas output of the main positioner 11 is connected to the first inlet of the three-way switching valve 16 via the first gas guide pipe 13, and the gas output of the backup positioner 12 is connected to the second inlet of the three-way switching valve 16 via the second gas guide pipe 14. Furthermore, the nuclear power unit's heat exchange system generates significant vibrations during operation. If the installation positions of the main positioner 11 and the backup positioner 12 are far from the three-way switching valve 16, the first gas guide pipe 13 and the second gas guide pipe 14 are easily loosened by vibration, affecting airtightness and consequently the reliability of gas flow. Therefore, this application configures a positioner bracket to be installed on the valve body of the three-way switching valve 16 using fixing bolts. The fixing bolts are equipped with spring washers, and the main positioner 11 and the backup positioner 12 are fixedly installed on the mounting plane of the positioner bracket. This shortens the length of the first gas guide pipe 13 and the second gas guide pipe 14 while reducing the impact of vibration on the airtightness of the pipelines, thereby improving the operational reliability of the positioner system.

[0068] In one possible implementation, the first filter pressure reducing valve and the main positioner 11 are connected by a fixing device, which includes a nut, a screw and an anti-slip washer.

[0069] In one possible implementation, the second filter pressure reducing valve 18 and the standby positioner 12 are connected by a fixing device, which includes a nut, a screw, and an anti-slip washer.

[0070] It should be noted that this application connects the first filter pressure reducing valve and the main positioner 11 through a fixing device, and connects the second filter pressure reducing valve 18 and the backup positioner 12 through a fixing device, thereby shortening the air path length between the filter pressure reducing valve and the positioner, improving the air tightness of the air path, and preventing the filter pressure reducing valve from falling off due to vibration by adding anti-slip pads.

[0071] To facilitate understanding of the positioner system adapted to the main feedwater flow regulating valve of a nuclear power plant provided in this application, an example of a possible implementation of this application is described below:

[0072] like Figure 2 The diagram shows the connection relationship of a positioner system adapted to the main feedwater flow regulating valve of a nuclear power plant. This positioner system includes: a main filter pressure reducing valve 21, a main positioner 11, a backup positioner 12, a first air guide line 13, a second air guide line 14, a third air guide line 15, a three-way switching valve 16, a first filter pressure reducing valve 17, a second filter pressure reducing valve 18, a solenoid on / off valve 22, a flow amplifier 23, a quick exhaust valve 24, and a nuclear power unit heat exchange controller 19.

[0073] The inlet of the main filter pressure reducing valve 21 is connected to the outlet of the nuclear power unit valve drive gas source. The first outlet of the main filter pressure reducing valve 21 is connected to the inlet of the first filter pressure reducing valve 17. The second outlet of the main filter pressure reducing valve 21 is connected to the inlet of the second filter pressure reducing valve 18. The inlets of both the first filter pressure reducing valve 17 and the second filter pressure reducing valve 18 are connected to the outlet of the nuclear power unit valve drive gas source. The outlet of the first filter pressure reducing valve 17 is connected to the gas input terminal of the main positioner 11. The outlet of the second filter pressure reducing valve 18 is connected to the gas input terminal of the backup positioner 12. The gas output terminal of the main positioner 11 is connected to the first inlet of the three-way switching valve 16 through the first gas guide pipe 13. The gas output terminal of the backup positioner 12 is connected to the first inlet of the three-way switching valve 16. The output end of the unit is connected to the second air inlet of the three-way switching valve 16 through the second air guide pipe 14. The air outlet of the three-way switching valve 16 is connected to the air inlet of the coupling of the main feedwater flow regulating valve of the nuclear power unit through the third air guide pipe 14. The flow amplifier 23 is connected in series in the third air guide pipe 14 between the electromagnetic on / off valve 22 and the coupling. The auxiliary air inlet of the flow amplifier 23 is connected to the third air outlet of the main filter pressure reducing valve 21. The quick exhaust valve 24 is connected in series in the third air guide pipe 14 between the electromagnetic on / off valve 22 and the coupling. The nuclear power unit heat exchange controller 19 is electrically connected to the main positioner 11, the backup positioner 12, the three-way switching valve 16, the electromagnetic on / off valve 22, the flow amplifier 23 and the quick exhaust valve 24 respectively.

Claims

1. A positioner system adapted to a main feedwater flow regulating valve in a nuclear power plant, characterized in that, include: Main positioner, backup positioner, first gas guide line, second gas guide line, third gas guide line, three-way switching valve, first filter pressure reducing valve, second filter pressure reducing valve, and nuclear power unit heat exchange controller. The inlets of both the first and second filter pressure reducing valves are connected to the outlet of the valve drive gas source of the nuclear power unit. The outlet of the first filter pressure reducing valve is connected to the gas input end of the main positioner, and the outlet of the second filter pressure reducing valve is connected to the gas input end of the backup positioner. The gas output end of the main positioner is connected to the first inlet of the three-way switching valve through the first gas guide pipe. The gas output end of the backup positioner is connected to the second inlet of the three-way switching valve through the second gas guide pipe. The outlet of the three-way switching valve is connected to the coupling inlet of the main feedwater flow regulating valve of the nuclear power unit through the third gas guide pipe. The nuclear power unit heat exchange controller is electrically connected to the main positioner, the backup positioner and the three-way switching valve respectively; When the main positioner fails, the three-way switching valve closes the first air inlet and opens the second air inlet. When the backup positioner fails, the three-way switching valve closes the second air inlet and opens the first air inlet.

2. The positioner system adapted to the main feedwater flow regulating valve of a nuclear power plant according to claim 1, characterized in that, The primary locator and the backup locator are locators equipped with inductive magnetic strips.

3. The positioner system adapted to the main feedwater flow regulating valve of a nuclear power plant according to claim 2, characterized in that, The induction magnetic strip is mounted on the surface of the rotating component of the coupling by fixing bolts, and the fixing bolts are equipped with spring washers.

4. The positioner system adapted to the main feedwater flow regulating valve of a nuclear power plant according to claim 1, characterized in that, The positioner system adapted to the main feedwater flow regulating valve of a nuclear power plant also includes: The main filter pressure reducing valve has its inlet connected to the outlet of the valve drive gas source of the nuclear power unit, its first outlet connected to the inlet of the first filter pressure reducing valve, and its second outlet connected to the inlet of the second filter pressure reducing valve. The maximum filtration particle size of the main filter pressure reducing valve is greater than that of the first filter pressure reducing valve, and the maximum filtration particle size of the main filter pressure reducing valve is greater than that of the second filter pressure reducing valve.

5. The positioner system adapted to the main feedwater flow regulating valve of a nuclear power plant according to claim 4, characterized in that, The positioner system adapted to the main feedwater flow regulating valve of a nuclear power plant also includes: At least one electromagnetic on / off valve is connected in series in the third gas pipeline and is electrically connected to the nuclear power unit heat exchange controller.

6. The positioner system adapted to the main feedwater flow regulating valve of a nuclear power plant according to claim 5, characterized in that, The positioner system adapted to the main feedwater flow regulating valve of a nuclear power plant also includes: A flow amplifier is connected in series in the third air guide line between the electromagnetic on / off valve and the coupling, and the auxiliary air inlet of the flow amplifier is connected to the third air outlet of the main filter pressure reducing valve. The flow amplifier is electrically connected to the nuclear power unit heat exchange controller.

7. The positioner system adapted to the main feedwater flow regulating valve of a nuclear power plant according to claim 5, characterized in that, The positioner system adapted to the main feedwater flow regulating valve of a nuclear power plant also includes: A quick exhaust valve, wherein the quick exhaust valve is connected in series in the third air guide line between the electromagnetic on / off valve and the coupling; The rapid exhaust valve is electrically connected to the nuclear power unit heat exchange controller.

8. The positioner system adapted to the main feedwater flow regulating valve of a nuclear power plant according to claim 1, characterized in that, The positioner system adapted to the main feedwater flow regulating valve of a nuclear power plant also includes: A positioner bracket is mounted on the valve body of the three-way switching valve by fixing bolts. The fixing bolts are equipped with spring washers. The main positioner and the backup positioner are fixedly mounted on the mounting plane of the positioner bracket.

9. The positioner system adapted to the main feedwater flow regulating valve of a nuclear power plant according to claim 1, characterized in that, The first filter pressure reducing valve and the main positioner are connected by a fixing device, which includes a nut, a screw and an anti-slip washer.

10. The positioner system adapted to the main feedwater flow regulating valve of a nuclear power plant according to claim 1, characterized in that, The second filter pressure reducing valve and the backup positioner are connected by a fixing device, which includes a nut, a screw, and an anti-slip washer.

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