Containment ventilation device for airborne radioactivity of nuclear power plant and group control method

Abstract

The present application relates to a kind of nuclear power plant airborne radioactive containment ventilation device and group control method, process function piece includes fresh air treatment function piece, air supply and exhaust and negative pressure regulation function piece and purification function piece, fresh air treatment function piece, air supply and exhaust and negative pressure regulation function piece and purification function piece are sequentially connected by pipeline, control piece includes global group control module, fresh air treatment group control module, air supply and exhaust and negative pressure regulation group control module, purification group control module.The nuclear power plant airborne radioactive containment ventilation device and group control method of the present application can make operator only need to send a small amount of simple control instruction by global group control module, realize the function control of each component, realize the automatic operation regulation of ventilation system under different conditions, system one-key start-stop function, can greatly improve the automation level of ventilation system, reduce operator operation load, reduce human error risk, simplify ventilation system control design.

Description

Technical Field

[0001] This invention relates to the field of nuclear-grade instrumentation and control equipment for nuclear power plants, and more specifically, to a nuclear power plant airborne radioactive containment ventilation device and a group control method. Background Technology

[0002] Group control technology allows operators to control a group of actuators to perform a complete function by issuing simple group control commands, following a built-in logical sequence. With minimal manual intervention, operators can control a group of actuators required to perform the same function by issuing system-level control commands, eliminating the need for manual control of each individual actuator. In group control technology, the control group has certain management functions over the lower-level actuators (or sub-groups) it controls, allowing operators to monitor the operating status of relevant actuators. When executing sequential control functions, operators can also see which step the system has reached; in case of malfunctions, the group control module can perform basic checks, such as timeouts or actuator failures, and simultaneously alert the operator through different screen colors flashing or alarms on the HMI (Human Machine Interface) to take timely action.

[0003] Group control functionality is achieved through the collaboration (inter-calling, nesting) of different types of standard group modules. A standard group control module has one or more input interfaces for receiving input signals and one or more output interfaces for output signals. In the illustrations, the left side of the module represents the input signal port, and the right side represents the output signal port. Based on the input signals (such as instrument measurement signals or actuator status feedback signals), the module internally processes them according to pre-set logic and outputs corresponding signals at the signal ports to control its lower-level actuators or communicate with other modules. Since the internal operational logic of the modules is tested, verified, and pre-set, designers can use different standard modules like building blocks when designing control methods. They only need to ensure the correctness of the logic between the standard modules to ensure the correctness of the entire control method. Therefore, the design difficulty and logical complexity of the control method can be reduced, thereby minimizing the risk of human error.

[0004] This solution uses three standard group control modules: a running mode switching module, a running condition setting module, and a running configuration selection module. A brief introduction to these three standard modules is as follows.

[0005] a) Operation Mode Switching Module: This module primarily manages the operation mode of the actuators controlled by the group. Operators can select between group automatic mode, group manual mode, or non-group mode based on operational needs. In non-group mode, the actuators are no longer in automatic control mode; they are essentially operating in manual mode, with the operator manually issuing control commands to each actuator via the HMI. Group automatic mode means that a series of control mechanisms automatically issue corresponding commands based on process requirements, driven by the control system to perform actions according to a preset sequence (or logic). Group manual mode means that when the group's actuators cannot operate automatically based on conditions, the operator must issue group control commands directly through the HMI before these controlled group actuators can perform corresponding operations according to a preset sequence (or logic). Both group manual and group automatic modes (i.e., group mode) require the actuators or sub-groups under their control to be in automatic mode.

[0006] b) Operating Condition Setting Module: The operating condition setting module is generally used in conjunction with the operating mode switching module. After the operating mode of the grouped actuators is determined (it operates in grouped mode, i.e., when the actuators are in automatic mode), it serves to set the execution direction. It generally has two opposite and mutually exclusive execution directions. For example, when condition 1 is met, it controls the relevant actuators to perform unit load increase operation; when condition 2 is met, it controls the relevant actuators to perform unit load decrease operation.

[0007] c) Run Configuration Selection Module: The run configuration module is mainly used to configure the priority of redundant actuators, that is, to determine which are the primary actuators and which are the standby actuators. During the operation of the functional components, if the primary actuator fails, this module can automatically activate the standby actuator. During the initial run, operators must manually pre-configure the redundant actuators through the HMI.

[0008] Standard group modules can communicate, call, and nest with each other. These three types of group control modules combine to complete specific control functions. The operating mode switching module is generally at the highest level and is used by the operator to set the operating mode of the corresponding controlled device. In group automatic mode (where the actuators or sub-groups under its control are in automatic mode), the operating condition setting module automatically determines the execution direction and issues control commands to the group of devices it controls based on pre-set logical conditions. In group manual mode, the operating condition setting module issues control commands to the group of devices it controls based on the operator's manual input commands on the HMI interface. After a certain delay, it determines whether the control commands controlled by the operating condition setting module have been correctly executed based on the feedback information received from the lower-level actuators or sub-groups. The operating configuration selection module is used to set the startup priority of redundant devices or sub-groups with the same function. Generally, two or more operating configuration modules are used in conjunction. After receiving the "start" command from the operating condition setting module, the device set to start first will start first, while the redundant devices that are not set to start first will be in standby mode. At the same time, it receives status feedback information from the controlled equipment, and when the equipment that is prioritized for startup fails, it will control the redundant equipment in standby status to start automatically.

[0009] Radioactive control zones are widely distributed throughout different buildings of a nuclear power plant. The operating strategies of the front-end process systems in each control zone differ under different operating conditions. Consequently, the operating modes and states of the ventilation systems serving these processes need to be flexibly adjusted according to demand, such as implementing ventilation isolation or variable air volume operation in a specific area. Airborne radioactive containment ventilation systems in nuclear power plants are characterized by relatively complex operation and control, a large number of systems, and wide distribution. The ventilation system of a nuclear power plant plays a crucial role in ensuring the normal operation of the front-end process systems. Its correct operation is a prerequisite for the correct operation of the nuclear island's front-end process systems and for achieving the goal of safe and controlled power generation of the nuclear power plant. Using the traditional method of operators controlling each ventilation system individually through HMIs would lead to a heavy workload for operators and increase the risk of human error. Summary of the Invention

[0010] The technical problem to be solved by the present invention is to provide a nuclear power plant airborne radioactive containment ventilation device and a group control method, in view of the above-mentioned defects of the prior art.

[0011] The technical solution adopted by the present invention to solve its technical problem is: a nuclear power plant airborne radioactive containment ventilation device, the process functional components including a fresh air handling functional component, a supply / exhaust air and negative pressure regulation functional component and a purification functional component, the fresh air handling functional component, the supply / exhaust air and negative pressure regulation functional component and the purification functional component are connected in sequence through pipelines, and the control components include a global group control module, a fresh air handling group control module, a supply / exhaust air and negative pressure regulation group control module and a purification group control module.

[0012] In some embodiments, the fresh air treatment group control module is electrically connected to the fresh air treatment functional component to control the operation of the fresh air treatment functional component under different requirements and to process the outdoor fresh air flowing to the factory.

[0013] In some embodiments, the fresh air treatment group control module is electrically connected to the global group control module to receive control commands from the global group control module.

[0014] In some embodiments, the fresh air handling component includes an inlet grille, an electric isolation valve, and a first filter element, wherein the inlet grille, the electric isolation valve, and the first filter element are connected in sequence via pipes.

[0015] In some embodiments, the fresh air handling function further includes a fresh air conditioning component for regulating the temperature and humidity of the ventilation and an air supply manifold for collecting and distributing the supply air, wherein the fresh air conditioning component and the air supply manifold are connected via the duct.

[0016] In some embodiments, the fresh air handling function further includes measuring instruments, which are connected to the air supply manifold and the outside atmosphere respectively, to measure the outdoor fresh air temperature and the temperature and humidity of the supplied air.

[0017] In some embodiments, the supply / exhaust air and negative pressure regulation group control module is electrically connected to the supply / exhaust air and negative pressure regulation functional component to control the supply / exhaust air and negative pressure regulation functional component to adjust the ventilation flow rate of the plant under different needs, and to regulate the pressure in the plant.

[0018] In some embodiments, the air supply / exhaust and negative pressure regulation group control module is electrically connected to the global group control module to receive control commands from the global group control module.

[0019] In some embodiments, the air supply / exhaust and negative pressure regulating functional components include an air supply component, a negative pressure regulating component, and an exhaust component;

[0020] The air supply component is connected to the factory building via a pipe to drive the fresh air treated by the fresh air handling unit to flow into the factory building;

[0021] The negative pressure regulating component is connected to the factory building to regulate the pressure inside the factory building;

[0022] The exhaust fan is connected to the factory building via a pipe, driving the ventilation of the factory building to exhaust air and filtering aerosols and impurities in the exhaust air.

[0023] In some embodiments, the supply / exhaust air and negative pressure regulating function further includes a pressure gauge, which is connected to the supply air component, the negative pressure regulating component and the exhaust air component respectively, to detect the pressure at the outlet of the supply air fan, inside the plant, inside the pipe between the plant and the exhaust air fan, and at the inlet of the exhaust air fan.

[0024] In some embodiments, the purification group control module is electrically connected to the purification functional component to control the purification functional component to remove airborne radioactivity from its exhaust air when airborne radioactive contamination occurs in the plant.

[0025] In some embodiments, the purification group control module is electrically connected to the global group control module to receive control commands from the global group control module.

[0026] In some embodiments, the purification functional components include an airborne radioactivity concentration detector, a switching valve, and a filter inlet manifold;

[0027] The airborne radioactivity concentration detector is connected to the exhaust duct between the plant and the exhaust fan. The switching valve is connected to the filter inlet manifold through the duct. The airborne radioactivity concentration detector is electrically connected to the switching valve to control the exhaust air to flow through the switching valve to the filter inlet manifold or to the exhaust inlet manifold.

[0028] In some embodiments, the purification function further includes at least one set of purification components, at least one pressurized fan, and a filter outlet manifold;

[0029] The filter inlet manifold, the purification unit, the pressurized fan, and the filter outlet manifold are connected in sequence through the pipe. The filter outlet manifold is also connected to the exhaust inlet manifold through the pipe to filter the exhaust air from the factory and discharge it through the ventilation device.

[0030] In some embodiments, the purification component further includes an inlet pressure gauge and a bypass regulating valve;

[0031] The inlet pressure gauge is electrically connected to the bypass regulating valve. The inlet pressure gauge is connected to the filter inlet manifold, and the bypass regulating valve is installed on the pipe connecting the exhaust inlet manifold and the filter inlet manifold to control the flow of exhaust air from the exhaust inlet manifold to the filter inlet manifold, thereby regulating the pressure at the filter inlet manifold.

[0032] A group control method for a nuclear power plant's airborne radioactive containment ventilation system includes the following steps:

[0033] S1. The operator sets the subgroups controlled by the global group control module to "automatic" state through the global group control module on the HMI interface, and manually sets the operating conditions of the global group control module through the global group control module. The global group control module sends control commands to the fresh air treatment group control module, and the fresh air treatment group control module controls the fresh air treatment function to operate according to the commands in order to treat the outdoor fresh air flowing into the plant.

[0034] S2. The global group control module sends control commands to the air supply / exhaust and negative pressure regulation group control module. The air supply / exhaust and negative pressure regulation group control module controls the operation of the air supply / exhaust and negative pressure regulation functional components according to the commands, so as to control the ventilation flow rate in the plant and regulate the pressure in the plant.

[0035] S3. The global group control module sends a control command to the purification group control module, and the purification group control module controls the operation of the purification functional components to remove airborne radioactivity from the exhaust air when airborne radioactive contamination occurs in the plant. 。

[0036] Implementing this invention has the following beneficial effects: The nuclear power plant airborne radioactive containment ventilation device and group control method of this invention enable operators to control the functions of each component by sending a small number of simple control commands through the global group control module, realize the automatic operation and adjustment of the ventilation system under different operating conditions, and the system can start and stop with one key. This can greatly improve the automation level of the ventilation system, reduce the operator's workload, reduce the risk of human error, and simplify the control design of the ventilation system.

[0037] This control method achieves one-button start / stop and automatic operation adjustment of the device through the combination, nesting, and mutual invocation of group modules at various levels. Simultaneously, each group module can monitor the operating status of its controlled actuators or sub-groups. For redundant actuators, if one group of actuators fails, it can automatically switch to another redundant group to ensure stable operation of the device. Attached Figure Description

[0038] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0039] Figure 1 This is a schematic diagram of the fresh air treatment functional component in an embodiment of the present invention;

[0040] Figure 2 This is a schematic diagram of the operation of the fresh air treatment component in an embodiment of the present invention;

[0041] Figure 3 This is a schematic diagram of the air supply / exhaust and negative pressure regulation function components in an embodiment of the present invention;

[0042] Figure 4 This is a schematic diagram of the operation of the air supply / exhaust and negative pressure regulation components in an embodiment of the present invention;

[0043] Figure 5 This is a schematic diagram of the purification function component in an embodiment of the present invention;

[0044] Figure 6 This is a schematic diagram of the operation of the purification component in an embodiment of the present invention;

[0045] Figure 7 This is a schematic diagram of the overall operation of the airborne radioactive containment ventilation device and group control method for nuclear power plants in an embodiment of the present invention. Detailed Implementation

[0046] To provide a clearer understanding of the technical features, objectives, and effects of the present invention, specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0047] Figures 1 to 7 This invention illustrates a nuclear power plant airborne radioactive containment ventilation device and group control method in some embodiments. The combination of this device and control method enables operators to adjust and control the ventilation system under different conditions using a small number of global control commands. Its process functional components include a fresh air handling component 22 for handling fresh air flowing to the outside of the plant, a supply / exhaust air and negative pressure regulation component 32 for controlling the ventilation flow rate and regulating the pressure within the plant, and a purification component 42 for removing airborne radioactivity from the plant exhaust air when airborne radioactive contamination occurs at the power plant. Its control components include a global group control module 1, a fresh air handling group control module 21, a supply / exhaust air and negative pressure regulation group control module 31, and a purification group control module 41. The global group control module 1 is electrically connected to the fresh air handling group control module 21, the supply / exhaust air and negative pressure regulation group control module 31, and the purification group control module 41, respectively. The fresh air handling functional component 22, the supply / exhaust air and negative pressure regulation functional component 32, and the purification functional component 42 are connected in sequence through pipes. The fresh air handling group control module 21 is electrically connected to the actuators and instruments in the fresh air handling functional component 22 to control the operation of the fresh air handling functional component 22. The supply / exhaust air and negative pressure regulation group control module 31 is electrically connected to the actuators and instruments in the supply / exhaust air and negative pressure regulation functional component 32 to control the operation of the supply / exhaust air and negative pressure regulation functional component 32. The purification group control module 41 is electrically connected to the actuators and instruments in the purification functional component 42 to control the operation of the purification functional component 42.

[0048] The global group control module 1 controls the fresh air handling group control module 21, the supply / exhaust air and negative pressure regulation group control module 31, and the purification group control module 41 to start / stop in a specific sequence. In turn, the fresh air handling group control module 21, the supply / exhaust air and negative pressure regulation group control module 31, and the purification group control module 41 control the actuators of the fresh air handling functional component 22, the supply / exhaust air and negative pressure regulation functional component 32, and the purification functional component 42 respectively to start / stop and regulate the functions, thereby ventilating the plant 3222. During this process, the pressure inside the plant 3222 (negative pressure relative to the outdoor atmosphere) is controlled in real time. When airborne radioactive contamination occurs inside the plant 3222, the exhaust air is filtered to remove the airborne radioactivity from the exhaust air.

[0049] The nuclear power plant airborne radioactive containment ventilation device and group control method of the present invention enable operators to control the functions of each component by sending a small number of simple control commands through the global group control module. This enables automatic operation and adjustment of the ventilation system under different operating conditions, one-button start and stop of the system, and other functions. It can greatly improve the automation level of the ventilation system, reduce the operator's workload, reduce the risk of human error, and simplify the design of ventilation system control.

[0050] The global group control module 1 includes a global group operation mode switching module 11 and a global group operation condition setting module 12. The global group operation mode switching module 11 is used to set the operation mode ("automatic" or "manual") of the sub-group fresh air handling group control module 21, supply / exhaust air and negative pressure regulation group control module 31, and purification group control module 41 under the control of the global group control module 1. The global group operation condition setting module 12 is used to set the system operation conditions ("start" or "stop") according to the requirements, and send corresponding control commands to the sub-group fresh air handling group control module 21, supply / exhaust air and negative pressure regulation group control module 31, and purification group control module 41 under the control of the global group control module 1.

[0051] In some embodiments, the fresh air treatment component and its group control module 2 are electrically connected to the fresh air treatment functional component 22 to control the fresh air treatment functional component 22 to treat the outdoor fresh air flowing to the factory building 3222. At the same time, the fresh air treatment group control module 21 is electrically connected to the global group control module 1. The global group control module 1 can send a ("start" or "stop") control command to the fresh air treatment group control module 21. After receiving the signal, the fresh air treatment group control module 21 controls the operation (start / stop or adjust) of the fresh air treatment functional component (22) according to the command to treat the outdoor fresh air flowing to the factory building (3222).

[0052] Specifically, in some embodiments, the fresh air handling component 22 includes an inlet grille 221, an electrically operated isolation valve 222, and a first filter element 223. The inlet grille 221 is installed at the end of the duct facing the outside to prevent larger foreign objects from entering the ventilation device through the duct and damaging it. The electrically operated isolation valve 222 is installed on the duct to isolate outdoor fresh air when the system is shut down. The first filter element 223 is installed on the duct after the electrically operated isolation valve 222 to purify and filter the fresh air flowing to the plant 3222. The first filter element 223 includes a pre-filter and a medium-efficiency filter. The pre-filter is located close to the electrically operated isolation valve 222, and the medium-efficiency filter is located away from the electrically operated isolation valve 222. The inlet grille 221, the electrically operated isolation valve 222, and the first filter element 223 are connected in sequence through ducts to allow ventilation to enter the ventilation device and purify and filter the ventilation, removing impurities from the outdoor fresh air.

[0053] In some embodiments, the fresh air handling component 22 also includes a fresh air regulating component 224 and an air supply manifold 225. The fresh air regulating component 224 is used to regulate the temperature and humidity of the ventilation, and the air supply manifold 225 is used to distribute the treated air. The fresh air regulating component 224 and the air supply manifold 225 are connected by pipes. In this embodiment, the fresh air regulating component 224 includes a heating coil 2241, a heating water regulating valve 2242, a cooling coil 2243, a cooling water regulating valve 2244, a humidifier 2245, and a humidification regulating valve 2246. The heating coil 2241, the cooling coil 2243, and the humidifier 2245 are respectively installed on the pipes to heat or cool the ventilation flowing to the plant 3222 and to humidify it, so as to ensure that the temperature and humidity of the ventilation flowing to the plant 3222 meet the requirements. A heating water regulating valve 2242 is installed on the water-side pipe of the heating coil 2241 to control the flow rate of heating water into the heating coil 2241, thereby regulating the output of the heating coil. A cooling water regulating valve 2244 is installed on the water-side pipe of the cooling coil 2243 to control the flow rate of cooling water into the cooling coil 2243, thereby regulating the output of the heating coil 2241. A humidification regulating valve 2246 is installed on the water-side pipe of the humidifier 2245 to control the flow rate of water into the humidifier 2245, thereby regulating the output of the humidifier. An air supply manifold 225 is installed on the duct. Outdoor fresh air flows into the air supply manifold 225 after being treated by the fresh air regulating component 224. The air supply manifold 225 is used to distribute the airflow to the downstream user plants 3222.

[0054] In some embodiments, the fresh air handling functional component 22 also includes measuring instruments 226. The measuring instruments 226 are connected to the air supply manifold 225 and the outside atmosphere respectively to measure the temperature and humidity of the supplied air and the outdoor fresh air temperature. Specifically, the measuring instruments 226 include a first thermometer 2261, a second thermometer 2262 and a hygrometer 2263. The first thermometer 2261 is connected to the outside and is electrically connected to the heating water regulating valve 2242 and the cooling water regulating valve 2244 to measure the air temperature of the outside atmosphere. The fresh air handling component control group 22 determines whether to activate the heating coil 2241 or the cooling coil 2243 based on this. The second thermometer 2262 is connected to the air supply manifold 225 and electrically connected to the heating water regulating valve 2242 and the cooling water regulating valve 2244. It is used to determine whether the temperature of the treated fresh air meets the target set value for the supply air temperature. The heating water regulating valve 2242 and the cooling water regulating valve 2244 adjust the output of the heating coil 2241 (or cooling coil 2243) based on the deviation between their measured values ​​and the target set value. The humidifier 2263 is connected to the air supply manifold 225 and electrically connected to the humidification regulating valve 2246. It is used to determine whether the humidity of the treated fresh air reaches the target set value. The humidification regulating valve 2246 adjusts the output of the humidifier 2245 based on the deviation between its measured value and the target set value.

[0055] The specific operation and control of the fresh air handling components and their group control module 2 are as follows: The fresh air handling group control module 21 is electrically connected to the actuators and instruments in the fresh air handling functional component 22. The fresh air handling group control module 21 includes a fresh air operation mode switching module 211 and a fresh air operation condition setting module 212, which are used to control the operation of the relevant actuators in the fresh air handling functional component 22. The fresh air operation mode switching module 211 is used to set the operating status ("automatic" or "manual") of the equipment or sub-groups under the control of the fresh air handling group control module 21. When the fresh air operation mode switching module 211 sets the actuator of the fresh air handling functional component 22 to the "automatic" state, when the global group control module 1 sends a start control signal to the fresh air handling group control module 21, the fresh air operation condition setting module 212 is automatically set to the "start" condition. The fresh air handling group control module 21 controls the electric isolation valve 222 to open, and simultaneously determines whether to activate the heating coil 2241 or the cooling coil 2243 of the fresh air handling function based on the ambient air temperature value measured by the first thermometer 2261. When the measured value of the first thermometer 2261 is less than the set value, the fresh air handling group control module 21 determines that it is in winter mode, and controls the heating water regulating valve 2242 to start regulating (at this time, the cooling water regulating valve 2244 is closed), and the heating coil 2241 heats the ventilation in the duct; when the measured value of the first thermometer 2261 is greater than the set value, the fresh air handling group control module 21 determines that it is in summer mode, and controls the cooling water regulating valve 2244 to start regulating (at this time, the heating water regulating valve 2242 is closed), and the cooling coil 2243 cools the ventilation in the duct; when the measured value of the first thermometer 2261 is exactly equal to the set temperature value, no heating or cooling treatment is required for the ventilation. The second thermometer 2262 measures the temperature of the ventilation inside the air supply manifold 225. The hot water regulating valve 2242 (when the heating coil 2241 is in operation) or the cooling water regulating valve 2244 (when the cooling coil 2243 is in operation) continuously adjusts its opening based on the deviation between its measured value and the target set value of the air supply temperature, eliminating the deviation and maintaining the air supply temperature at the target set value. At the same time, the humidifier 2263 measures the humidity of the ventilation inside the air supply manifold 225. The humidifier flow regulating valve 2246 continuously adjusts its opening based on the deviation between its measured value and the target set value of the air supply humidity, eliminating the deviation and maintaining the air supply humidity at the target set value.

[0056] In some embodiments, the supply / exhaust air and negative pressure regulation group control module 31 is electrically connected to the supply / exhaust air and negative pressure regulation functional component 32 to control the actuator of the fresh air handling functional component 22, control the ventilation flow rate in the plant 3222, and regulate the pressure in the plant 3222. The supply / exhaust air and negative pressure regulation group control module 31 is electrically connected to the global group control module 1. The global group control module 1 can send ("start" or "stop") control commands to the supply / exhaust air and negative pressure regulation group control module 31. After receiving the signal, the supply / exhaust air and negative pressure regulation group control module 31 controls the operation (start / stop or regulate) of the supply / exhaust air and negative pressure regulation functional component 32 according to the command to control the ventilation flow rate in the plant 3222 and regulate the pressure in the plant 3222.

[0057] Specifically, in some embodiments, the supply / exhaust ventilation and negative pressure regulating function 32 includes an air supply component 321, a negative pressure regulating component 322, and an exhaust component 323. The air supply component 321 is connected to the plant 3222 via a pipe and is used to supply air to the plant 3222. The negative pressure regulating component 322 is connected to the plant 3222 and is used to regulate the pressure (relative negative pressure) in the plant 3222 to maintain it at the target set value. The exhaust component 323 is connected to the plant 3222 via a pipe and is used to exhaust air from the plant 3222.

[0058] The air supply component 321 includes an air inlet header 3211, one or more air supply fans 3212, an equal number of air supply frequency converters 3213, and an air outlet header 3214. The air inlet header 3211 and the air supply header 225 are connected by pipes to drive the airflow. In this embodiment, two air supply fans 3212 and two air supply frequency converters 3213 are provided. The two air supply fans 3212 are respectively connected to the air inlet header 3211 by pipes to drive the airflow. The airflow is directed towards the plant 3222. Each air supply frequency converter 3213 is electrically connected to one air supply fan 3212 to control the operating frequency of the air supply fan 3212, so that the ventilation flow and pressure to the plant 3222 can be flexibly adjusted according to demand. The air supply outlet header 3214 is connected to the two air supply fans 3212 through pipes and to the plant 3222 through pipes. It is used to collect and distribute the ventilation driven by the air supply fans 3212 and distribute the ventilation to one (or more) downstream to the plant 3222.

[0059] The exhaust system 323 includes an exhaust inlet header 3231, one or more exhaust fans 3232, an exhaust frequency converter 3233 equal in number to the exhaust fans 3232, and an exhaust outlet header 3234. The exhaust inlet header 3231 is connected to the factory building 3222 via a pipe and is used to collect the exhaust air discharged from the factory building 3222. In this embodiment, two exhaust fans 3232 and two exhaust frequency converters 3233 are provided. The two exhaust fans 3232 are respectively... The exhaust inlet header 3231 is connected by a pipe to drive the exhaust air out of the factory 3222. Each exhaust frequency converter 3233 is electrically connected to an exhaust fan 3232 to adjust the frequency of the exhaust fan 3232, so that the exhaust air flow and pressure can be flexibly adjusted according to the needs. The exhaust outlet header 3234 is connected to the two exhaust fans 3232 by pipes to collect the exhaust air driven by the exhaust fans 3232 and discharge it through the chimney at a high level.

[0060] The negative pressure regulating component 322 includes an air supply regulating valve 3221 and an exhaust regulating valve 3223. The air supply regulating valve 3221 is installed on the pipeline between the air supply outlet header 3214 and the plant 3222 to regulate the flow rate of ventilation to the plant 3222. The exhaust regulating valve 3223 is installed on the pipeline between the plant 3222 and the exhaust inlet header 3231 to regulate the exhaust flow rate of the exhaust air discharged from the plant 3222. The air supply regulating valve 3221 and the exhaust regulating valve 3223 cooperate to adjust the difference between the supply and exhaust air flow rates in the plant 3222 as needed to maintain the pressure (relative negative pressure) of the plant 3222.

[0061] In some embodiments, the supply / exhaust ventilation and negative pressure regulating component 32 also includes a pressure gauge 324. The pressure gauge 324 is electrically connected to the supply ventilation component 321, the negative pressure regulating component 322, and the exhaust ventilation component 323, respectively, to measure the pressure in the supply ventilation outlet header 3214, the plant 3222, and the exhaust ventilation component 323. In this embodiment, the pressure monitoring instruments include a supply ventilation outlet header pressure gauge 3241, a plant pressure gauge 3242, an exhaust duct pressure gauge 3243, and an exhaust inlet header pressure gauge 3244. Test gauge 3241 is connected to the air supply outlet header 3214 to detect the pressure of the air supply header 3214. Plant pressure test gauge 3242 is connected to the plant 3222 to detect the pressure (relative negative pressure) inside the plant 3222. Exhaust duct pressure test gauge 3243 is connected to the pipe between the plant 3222 and the exhaust regulating valve 3223 to detect the pressure value of the exhaust air discharged from the plant 3222. Exhaust inlet header test gauge 3244 is connected to the exhaust inlet header 3231 to detect the pressure of the exhaust air flowing into the exhaust inlet header 3231.

[0062] In some embodiments, the supply / exhaust air and negative pressure regulating component 32 also includes a second filter element 325. The second filter element 325 is installed on the pipe between the exhaust air regulating valve 3223 and the exhaust air inlet header 3231, and is used to filter and purify impurities, aerosols, etc. in the exhaust air discharged from the plant 3222. The second filter element 325 includes a pre-filter and a high-efficiency filter. The pre-filter is close to the exhaust air regulating valve 3223, and the high-efficiency filter is away from the exhaust air regulating valve 3223.

[0063] The specific operation control of the supply / exhaust air and negative pressure regulation component 3 is as follows: The supply / exhaust air and negative pressure regulation group control module 31 is electrically connected to the actuators and instruments of the supply / exhaust air and negative pressure regulation functional component 32. Specifically, in this embodiment, the supply / exhaust air and negative pressure regulation group control module 31 includes a supply / exhaust air and negative pressure regulation operation mode switching module 311, a supply / exhaust air and negative pressure regulation operation condition setting module 312, and a supply / exhaust air redundant equipment operation configuration selection module 313, which are used to control the operation of the relevant actuators of the supply / exhaust air and negative pressure regulation functional component 32. The supply / exhaust air and negative pressure regulation operation mode switching module 311 is used to set the operating status ("automatic" or "manual") of the equipment or sub-group under the control of the supply / exhaust air and negative pressure regulation group control module 31. When the supply / exhaust ventilation and negative pressure regulation operation mode switching module 311 sets the actuator of the supply / exhaust ventilation and negative pressure regulation function to the "automatic" state, when the global group control module 1 sends a start control signal to the supply / exhaust ventilation and negative pressure regulation group control module 31, the supply / exhaust ventilation and negative pressure regulation operation condition setting module 312 is automatically set to the "start" condition. The supply / exhaust ventilation and negative pressure regulation group control module 31 sends start control signals to the relevant actuators and the supply / exhaust ventilation redundant equipment operation configuration selection module 313 in the order of starting the exhaust fan 3232 first and then starting the supply fan 3212.

[0064] The supply / exhaust redundant equipment operation configuration selection module 313 includes a first operation configuration selection module 3131 and a second operation configuration selection module 3132. The first operation configuration selection module 3131 is electrically connected to the first supply fan 3212, and the second operation configuration selection module 3132 is electrically connected to the second supply fan 3212. The two supply fans 3212 are redundantly configured, with one in operation and one on standby during normal operation. The first supply fan 3212 can be set to start first via the first operation configuration selection module 3131, and the second supply fan 3212 can be set to start first via the second operation configuration selection module 3132. The first and second operation configuration selection modules 3131 and 3132 are electrically connected, and their settings are mutually exclusive. Once one module is set to start first, its redundant equipment (module) will be automatically interlocked and set as standby equipment. When the first operation configuration selection module 3131 sets the first blower 3212 as the priority start-up device and receives the start command from the supply / exhaust air and negative pressure regulation operation condition setting module 312, the first operation configuration selection module 3131 sends a start command to the first blower 3212, and the first blower 3212 starts running. At the same time, the first operation configuration selection module 3131 receives the "running" status feedback of the first blower 3212. At this time, the second operation configuration selection module 3132 and the second blower 3212 are in standby state. When the first blower 3212 starts or malfunctions, the first operation configuration selection module 3131 will receive feedback on the abnormal operation status of the first blower 3212. The first operation configuration selection module 3131 will feed back the abnormal control equipment signal to its standby second operation configuration selection module 3132. After receiving the start command from the supply / exhaust air and negative pressure regulation operation condition setting module 312 and the abnormal operation signal from the priority start module, the standby second operation configuration selection module 3132 will send a start command to the standby second blower 3212, thereby realizing the automatic interlocking start of the standby second blower 3212.

[0065] The supply / exhaust redundant equipment operation configuration selection module 313 also includes a third operation configuration selection module 3133 and a fourth operation configuration selection module 3134. The third operation configuration selection module 3133 is electrically connected to the first exhaust fan 3232, and the fourth operation configuration selection module 3134 is electrically connected to the second exhaust fan 3232. The two exhaust fans 3232 are redundantly configured, with one in use and one on standby during normal operation. The first exhaust fan 3232 can be set to start first via the third operation configuration selection module 3133, and the second exhaust fan 3232 can be set to start first via the fourth operation configuration selection module 3134. The third and fourth operation configuration selection modules 3133 and 3134 are electrically connected, and their settings are mutually exclusive. Once one module is set to start first, its redundant device (module) will be automatically interlocked and set as the standby device. When the third operation configuration selection module 3133 sets the first exhaust fan 3232 as the priority start-up device and receives the start command from the supply / exhaust air and negative pressure regulation operation condition setting module 312, the third operation configuration selection module 3133 sends a start command to the first exhaust fan 3232, and the first exhaust fan 3232 starts running. At the same time, the third operation configuration selection module 3133 receives the "running" status feedback of the first exhaust fan. At this time, the fourth operation configuration selection module 3134 and the second air supply unit 3232 are in standby state. When the first exhaust fan 3232 starts or malfunctions, the third operation configuration selection module 3133 will receive feedback on the abnormal operation status of the first exhaust fan 3232. At this time, the third operation configuration selection module 3133 will feed back the abnormal control equipment signal to its backup fourth operation configuration selection module 3134. After receiving the start command from the supply / exhaust and negative pressure regulation operation condition setting module 312 and the abnormal operation signal from the priority start module, the backup fourth operation configuration selection module 3134 will send a start command to the backup second exhaust fan 3232, thereby realizing the automatic interlocking start of the backup second exhaust fan 3232.

[0066] The air supply outlet header pressure gauge 3241 is electrically connected to the air supply frequency converter 3213. The air supply frequency converter 3213 continuously adjusts according to the deviation between its real-time detected value and the set target value to eliminate the deviation and maintain stable air supply pressure. The plant pressure gauge 3242 is electrically connected to the air supply regulating valve 3221. The air supply regulating valve 3221 continuously adjusts according to the deviation between its real-time detected value and the set target value to eliminate the deviation and maintain stable pressure (relative to atmospheric negative pressure) within the plant 3222. The exhaust duct pressure gauge 3243 is electrically connected to the exhaust regulating valve 3223. The exhaust regulating valve 3223 continuously adjusts according to the deviation between its real-time detected value and the set target value to eliminate the deviation and adjust the exhaust flow rate to reach the set value. The exhaust inlet header pressure gauge 3244 is electrically connected to the exhaust frequency converter 3233. The air supply frequency converter 3213 continuously adjusts according to the deviation between its real-time detected value and the set target value to eliminate the deviation and maintain stable exhaust pressure.

[0067] In some embodiments, the purification component 4 is electrically connected to the purification functional component 42, and is used to control the purification functional component 42 to remove the airborne radioactivity from its exhaust air when airborne radioactive contamination occurs in the plant 3222. At the same time, the purification group control module 41 is electrically connected to the global group control module 1, and the global group control module 1 can send a ("start" or "stop") control command to the purification group control module 41. After receiving the signal, the purification group control module 41 controls the operation (start / stop or adjust) of the purification functional component 42 according to the command to remove the airborne radioactivity from the exhaust air when airborne radioactive contamination occurs in the plant 3222.

[0068] Specifically, in some embodiments, the purification component 42 includes an airborne radioactivity concentration detector 421, a switching valve 422, and a filter inlet manifold 423. The airborne radioactivity concentration detector 421 is connected to a pipeline to detect the radioactivity concentration of the exhaust air discharged from the plant 3222. The switching valve 422 is connected to the filter inlet manifold 423 via a pipeline, and is also connected to the exhaust inlet manifold 3231 via a pipeline. The airborne radioactivity concentration detector 421 is electrically connected to the switching valve 422. When the airborne radioactivity concentration detector 421 detects that the radioactivity of the exhaust air is greater than a set value, the switching valve 422 controls the exhaust air to flow to the filter inlet manifold 423 to filter the airborne radioactivity in the exhaust air. When the airborne radioactivity concentration detector 421 detects that the radioactivity of the exhaust air does not exceed the set value, the switching valve 422 controls the exhaust air to flow to the exhaust inlet manifold 3231 for discharge. The switching valve 422 includes a normal exhaust isolation valve 4221 and an iodine-filtered exhaust isolation valve 4222. The normal exhaust isolation valve 4221 is connected to the exhaust inlet manifold 3231 via a pipe, and the iodine-filtered exhaust isolation valve 4222 is connected to the filter inlet manifold 423 via a pipe. When the airborne radioactivity concentration detector 421 detects that the radioactivity of the exhaust air is greater than the set value, the normal exhaust isolation valve 4221 closes and the iodine-filtered exhaust isolation valve 4222 opens, controlling the exhaust air flow to the filter inlet manifold 423. When the airborne radioactivity concentration detector 421 detects that the radioactivity of the exhaust air does not exceed the set value, the normal exhaust isolation valve 4221 opens and the iodine-filtered exhaust isolation valve 4222 closes, controlling the exhaust air flow to the exhaust inlet manifold 3231.

[0069] In some embodiments, the purification component 42 further includes one or more purification components 424, one or more pressurized fans 425, and a filter outlet header 426. In this embodiment, it includes two sets of purification components 424 and two pressurized fans 425. The two sets of purification components 424 are respectively connected to the filter inlet header 423 through pipes to filter the exhaust air discharged from the plant 3222 and remove the airborne radioactivity from the exhaust air. Each pressurized fan 425 is connected to one purification component 424 through a pipe to drive the exhaust air filtered by the purification component 424. The filter outlet header 426 is connected to the pressurized fan 425 through a pipe. The filter outlet header 426 is also connected to the exhaust inlet header 3231 in the exhaust and negative pressure regulating assembly through a pipe, so that the exhaust air that has been de-radioactively removed can be discharged from the ventilation device through the exhaust inlet header 3231 and the exhaust fan 3232.

[0070] In some embodiments, the purification component 424 includes a filter electric isolation valve 4241, a pipeline heater 4242, and an iodine adsorber 4243. The filter electric isolation valve 4241, the pipeline heater 4242, and the adsorber 4243 are connected in sequence through pipelines. Therefore, when the exhaust air passes through the purification component 42, it passes in sequence through the filter inlet header 423, the filter electric isolation valve 4241, the pipeline heater 4242, the iodine adsorber 4243, the pressurized fan 425, and the filter outlet header 426. The filter electric isolation valve 4241 is used to isolate the inlet air. When the airborne radioactivity concentration in the exhaust air exceeds the set value, the filter electric isolation valve 4241 opens, and the exhaust air passes through the heater 4242 and the iodine adsorber 4243, so that the airborne radioactivity in the exhaust air is removed. When the airborne radioactivity concentration in the exhaust air does not exceed the set value, the filter electric isolation valve 4241 closes. Heater 4242 is used to heat the exhaust air, reduce the relative humidity of the exhaust air, and ensure the adsorption efficiency of iodine adsorber 4243. Iodine adsorber 4243 is used to adsorb airborne radioactive iodine substances in the exhaust air.

[0071] In some embodiments, the purification function component 42 also includes an inlet pressure gauge 427 and a bypass regulating valve 428. The inlet pressure gauge 427 is connected to the filter inlet header 423 and is used to measure the pressure value inside the filter inlet header 423. The bypass regulating valve 428 is installed on the pipe connecting the exhaust inlet header 3231 and the filter inlet header 423 and is electrically connected to the inlet pressure gauge 427. The valve continuously adjusts the opening degree according to the deviation between the real-time detection value of the inlet pressure gauge 427 and the target set value of the filter inlet header 423 to eliminate the deviation and maintain the pressure stability of the filter inlet header 423.

[0072] The specific operation control of the purification component 4 is as follows: The purification group control module 41 is electrically connected to the purification functional component 42. Specifically, in this embodiment, the purification group control module 41 includes a purification operation mode switching module 411, a purification operation condition setting module 412, a fifth operation configuration selection module 4131 and a sixth operation configuration selection module 4132 for redundant devices (sub-groups), a first sub-operation condition setting module 4141 and a second sub-operation condition setting module 4142, used to control the operation of actuators related to the purification functional component 42. The purification operation mode switching module 411 sets the operating status ("automatic" or "manual") of the devices and sub-groups under the control of the purification group control module 41. The fifth operation configuration selection module 4131 is electrically connected to the first group of purification components 424, and the sixth operation configuration selection module 4132 is electrically connected to the second group of purification components 424. The first group of purification components 424 and the second group of purification components 424 are in a standby relationship. The first group of purification components 424 can be set to start first via the fifth operation configuration selection module 4131, and the second group of purification components 424 can be set to start first via the sixth operation configuration selection module 4132. The fifth operation configuration selection module 4131 and the sixth operation configuration selection module 4132 are electrically connected, and their settings are mutually exclusive. Once one module is set to start the device first, its redundant devices (modules) will be automatically interlocked and set as standby devices.

[0073] When the purification operation mode switching module 411 sets the relevant actuators of the purification function component 42 to the "automatic" state, and the global group control module 1 sends a start control signal to the purification group control module 41, the purification operation condition setting module 412 is automatically set to the "start" condition. When the airborne radioactivity concentration detector 421 detects that the airborne radioactivity concentration of the exhaust air does not exceed the set value, it sends an open signal to the normal exhaust isolation valve 4221 and a close signal to the iodine filter exhaust isolation valve 4222, so that the exhaust air bypasses the purification component 424 and directly enters the exhaust inlet header 3231, passes through the exhaust fan 3232, and is directly discharged through the exhaust fan outlet header 3234. At this time, the purification function component 42 does not start. However, when the airborne radioactivity concentration detector 421 detects that the airborne radioactivity concentration of the exhaust air exceeds the set value, it sends a close signal to the normal exhaust isolation valve 4221 and an open signal to the iodine filter exhaust isolation valve 4222, so that the exhaust air flows to the filter inlet header 423. If the fifth operation configuration selection module 4131 sets the first group of purification components 424 to start first, and the fifth operation configuration selection module 4131 simultaneously receives the start signal from the purification operation condition setting module 412 and the high airborne radioactivity concentration signal from the airborne radioactivity concentration detector 421, the fifth operation configuration selection module 4131 sends a start signal to the first sub-operation condition setting module 4141 of the first group of purification components 424. When the first sub-operation condition setting module 4141 receives the control signal, it sends a start signal to the filter electric isolation valve 4241, the pipeline heater 4242, and the first pressurized fan 425 in the first group of purification components 424, and starts the first group of exhaust components 424 to filter the exhaust air. After all actuators of the first group of purification components 424 have started, the filter electric isolation valve 4241, heater 4242, and first pressurizing fan 425 send "run" status feedback signals to the first sub-operation condition setting module 4141. When the first sub-operation condition setting module 4141 receives the "run" status feedback from all the actuators it controls, it indicates that the first group of purification components 424 has started. At this time, the first sub-operation condition setting module 4141 completes command execution and sends the module's "run" status feedback to the fifth operation configuration selection module 4131, indicating that the control command of the fifth operation configuration selection module 4131 has been executed.When one or more actuators in the first group of purification components 424 malfunction and cannot operate, triggering a "fault" signal for one or more devices in the first group of purification components 424, the first sub-operation condition setting module 4141 of the first group of purification components sends a "fault" status feedback to its upper-level fifth operation configuration selection module 4131. At this time, the fifth operation configuration selection module 4131 will feed back its control device abnormal signal to its backup sixth operation configuration selection module 4132. The sixth operation configuration selection module 4132, which is in a backup state, will prioritize starting the fifth operation configuration selection module upon receiving the start command from the purification operation condition setting module 412. Upon receiving the abnormal operation signal from the configuration selection module 4131 and the high airborne radioactivity concentration signal from the airborne radioactivity concentration detector 421, a start command is sent to the second sub-operation condition setting module 4142 of the second group of purification components 424, which is in standby mode. After receiving the control signal, the second sub-operation condition setting module 4142 of the second group of purification components 424 sends a start signal to the filter electric isolation valve 4241, the pipeline heater 4242, and the second pressurizing fan 425 in the second group of purification components 424, thereby starting the second group of purification components 424 to filter the exhaust air, so as to realize the automatic interlocking start of the second group of purification components 424 in standby mode.

[0074] If the sixth operation configuration selection module 4132 sets the second group of purification components 424 to start first, and simultaneously receives the start signal from the purification operation condition setting module 412 and the high airborne radioactivity concentration signal from the airborne radioactivity concentration detector 421, the sixth operation configuration selection module 4132 sends a start signal to the second sub-operation condition setting module 4142 of the second group of purification components 424. Upon receiving the control signal, the second sub-operation condition setting module 4142 of the second group of purification components 424 will start the second group of purification components 424 first, while the first group of purification components 424 remains in standby mode. If the second group of purification components 424 malfunctions, it will trigger the automatic start of the first group of purification components 424, which is in standby mode. The process is the same as when the first group of purification components 424 starts first, and a malfunction triggers the automatic start of the second group of purification components 424, which is in standby mode.

[0075] After being processed by the purification component 424, the exhaust air from the plant 3222 flows to the filter outlet header 426 under the action of the pressurized fan 425, then flows to the exhaust inlet header 3231, and finally is discharged under the action of the exhaust fan 3232.

[0076] A nuclear power plant airborne radioactive containment ventilation device and its group control method, the start-up control process includes the following steps:

[0077] S1. On the HMI interface, the operator sets the subgroups under the control of the global group control module 1 to "automatic" state through the global group control module 1, and manually sets the operating conditions of the global group control module 1 ("start"). The global group control module 1 sends control commands ("start command") to the fresh air handling group control module 21. The fresh air handling group control module 21 controls the fresh air handling functional component 22 to operate (start and adjust) according to the commands.

[0078] S2. After receiving the control command ("start") from the global group control module 1 and the feedback signal that the fresh air treatment group control module 21 has completed the start, the supply / exhaust air and negative pressure regulation group control module 31 controls the supply / exhaust air and negative pressure regulation functional component 32 to operate (start and regulate) according to the command.

[0079] S3. After receiving the control command ("start") from the global group control module 1 and the feedback signal that the fresh air treatment group control module 21 has completed the start-up, the purification group control module 41 controls the purification function component 42 to operate (start and adjust).

[0080] A nuclear power plant airborne radioactive containment ventilation device and its group control method, wherein the shutdown control process includes the following steps:

[0081] S1. The operator sets the subgroups under the control of the global group control module 1 to "automatic" state through the global group control module 1 on the HMI interface, and manually sets the operating conditions of the global group control module 1 ("stop"). The global group control module 1 sends a control command ("stop command") to the purification group control module 41, and the purification group control module 41 controls the purification function component 42 to stop operating according to the command.

[0082] S2. After receiving the control command ("stop" command) from the global group control module 1 and the feedback signal from the purification group control module 41 after it has completed the shutdown, the supply / exhaust air and negative pressure regulation group control module 31 controls the supply / exhaust air and negative pressure regulation function 32 to shut down according to the command.

[0083] S3. After receiving the control command ("stop" command) from the global group control module 1 and the feedback signal that the supply / exhaust air and negative pressure regulation group control module 31 has completed shutdown, the fresh air handling group control module 21 controls the fresh air handling function component 22 to shut down.

[0084] Specifically, taking the startup process as an example (the shutdown process is the same in principle), the operator first sets the lower-level fresh air operation condition setting module 212, supply / exhaust air and negative pressure regulation operation condition setting module 312, and purification operation condition setting module 412 controlled by the global group operation mode switching module 11 to the "automatic" state on the HMI. On the HMI, the global group operation condition setting module 12 sets the system operation condition to the "startup" condition. The global group operation condition setting module 12 sends "startup" commands to each of its next-level subgroups, controlling each functional component to start up and automatically adjust.

[0085] First, the fresh air handling unit 22 is activated via the fresh air handling group control module 21 to purify, filter, and regulate the temperature and humidity of the outdoor fresh air entering the plant 3222. Then, the supply / exhaust air and negative pressure regulation unit 32 is activated via the supply / exhaust air and negative pressure regulation group control module 31 to regulate the ventilation flow entering the plant 3222 and maintain the pressure (relative to atmospheric negative pressure) within the plant 3222. When airborne radioactive material contamination occurs within the plant 3222, the purification unit 42 is automatically activated via the purification group control module 41 to filter the exhaust air discharged from the plant 3222 and remove the airborne radioactivity from the exhaust air.

[0086] In an embodiment of the present invention, the fresh air treatment group control module 21, the supply / exhaust air and negative pressure regulation group control module 31, and the purification group control module 41 simultaneously receive the "start" command from the global operating condition setting module 12. The "in operation" feedback signal, which indicates that the fresh air treatment group control module 21 has completed its start-up, is used as a prerequisite for starting the supply / exhaust air and negative pressure regulation group control module 31. The "in operation" status feedback, which indicates that the supply / exhaust air and negative pressure regulation group control module 31 has completed its start-up, is used as a prerequisite for inputting the start command of the purification group control module 41. This achieves the setting of starting the fresh air treatment component 22, the supply / exhaust air and negative pressure regulation component 32, and the purification component 42 in a specific order. That is, the supply / exhaust air and negative pressure regulation control module 31 will start after the fresh air treatment group control module 21 completes the start-up and correctly sends the "in operation" status feedback signal, and the purification group control module 41 will start after the supply / exhaust air and negative pressure regulation group control module 31 completes the start-up and correctly sends the "in operation" status feedback signal.

[0087] When a subgroup receives a "start" command, it outputs a "start" control command to the lower-level actuators it controls and the next-level subgroups. The controlled actuators and the next-level subgroups begin to operate. When the controlled actuators and subgroups have all reached the start-up requirements, they input an "in operation" status feedback signal indicating that the start-up is complete to the control group. The control group receives the "in operation" status feedback signals from all the subgroups and actuators it controls, and outputs an "in operation" status feedback signal to its next-level control group. This process continues until the global group operation condition setting module 12 receives the "in operation" status feedback signal, indicating that the entire system has started up.

[0088] In this embodiment, when the fresh air handling group control module 21, the supply / exhaust air and negative pressure regulation group control module 31, and the purification group control module 41 send a "start" command to their respective next-level actuators or sub-group modules, the actuators and sub-group modules they control will all send a "running" status feedback signal after the start-up is completed. After receiving the "running" status feedback signals from all next-level actuators and sub-group modules, the fresh air handling group control module 21, the supply / exhaust air and negative pressure regulation group control module 31, and the purification group control module 41 will each send an "running" status feedback signal to the global operating condition setting module 12. Finally, when the global group operating condition setting module 12 receives the "running" status feedback signals from all the sub-groups it controls, it indicates that the entire system has started up successfully.

[0089] After each control group issues a "start" command to its controlled actuators and next-level sub-group modules, it should receive an "in operation" status signal from the controlled equipment and next-level sub-group modules after a specific time interval (determined by the time it takes for the controlled actuators and next-level sub-group modules to complete the start-up process). This indicates that the command has been executed successfully. If no "in operation" status feedback signal is received after the specified time interval, it indicates a fault in the start-up process. Different colors can be used in the HMI to represent the group's status, such as red for "start-up timeout or fault," green for "normal operation," and gray for "normal shutdown." This gives the control group operational monitoring capabilities and makes it easier for operators to locate faulty sub-functions or equipment. In this embodiment, if the global operating condition setting module 12 does not receive the "in operation" status feedback signal from its subordinate sub-group modules within a timeout period, the HMI can display and locate which component and its controlled actuator has malfunctioned based on the different statuses of the fresh air handling group control module 21, the supply / exhaust air and negative pressure regulation group control module 31, and the purification group control module 41.

[0090] Understandably, the above-mentioned technical features can be used in any combination without restriction.

[0091] The above are merely embodiments of the present invention and do not limit the scope of the patent. Any equivalent structural or procedural transformations made based on the description and drawings of the present invention, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of the present invention.

Claims

1. A nuclear power plant airborne radioactive containment ventilation device, characterized in that, The process functional components include a fresh air handling functional component (22), an air supply / exhaust and negative pressure regulation functional component (32), and a purification functional component (42). The fresh air handling functional component (22), the air supply / exhaust and negative pressure regulation functional component (32), and the purification functional component (42) are connected in sequence through pipes. The control components include a global group control module (1), a fresh air handling group control module (21), an air supply / exhaust and negative pressure regulation group control module (31), and a purification group control module (41). The fresh air treatment group control module (21) is electrically connected to the fresh air treatment functional component (22) to control the operation of the fresh air treatment functional component (22) under different needs and to process the outdoor fresh air flowing to the factory (3222). The fresh air treatment group control module (21) is electrically connected to the global group control module (1) to receive the control instructions of the global group control module (1). The air supply / exhaust and negative pressure regulation group control module (31) is electrically connected to the air supply / exhaust and negative pressure regulation functional component (32) to control the air supply / exhaust and negative pressure regulation functional component (32) to regulate the ventilation flow of the plant (3222) under different needs, and to regulate the pressure in the plant (3222). The air supply / exhaust and negative pressure regulation group control module (31) is electrically connected to the global group control module (1) to receive the control commands of the global group control module (1). The purification group control module (41) is electrically connected to the purification functional component (42) to control the purification functional component (42) to remove the airborne radioactivity in its exhaust air when airborne radioactive contamination occurs in the plant (3222). The purification group control module (41) is electrically connected to the global group control module (1) to receive control commands from the global group control module (1). The purification function component (42) includes an airborne radioactivity concentration detector (421), a switching valve (422), and a filter inlet manifold (423). The airborne radioactivity concentration detector (421) is connected to the exhaust duct between the plant (3222) and the exhaust fan (3232). The switching valve (422) is connected to the filter inlet header (423) through the duct. The airborne radioactivity concentration detector (421) is electrically connected to the switching valve (422) to control the exhaust air to flow through the switching valve (422) to the filter inlet header (423) or to the exhaust inlet header (3231). The purification function component (42) also includes at least one set of purification components (424), at least one pressurizing fan (425) and a filter outlet header (426). The filter inlet manifold (423), the purification component (424), the pressurized fan (425), and the filter outlet manifold (426) are connected in sequence through the pipe. The filter outlet manifold (426) is also connected to the exhaust inlet manifold (3231) through the pipe to filter the exhaust air from the factory (3222) and discharge it through the ventilation device. The purification function component (42) also includes an inlet pressure gauge (427) and a bypass regulating valve (428). The inlet pressure gauge (427) is electrically connected to the bypass regulating valve (428). The inlet pressure gauge (427) is connected to the filter inlet manifold (423). The bypass regulating valve (428) is installed on the pipe connecting the exhaust inlet manifold (3231) and the filter inlet manifold (423) to control the exhaust air to flow from the exhaust inlet manifold (3231) to the filter inlet manifold (423) in order to regulate the pressure at the filter inlet manifold (423).

2. The airborne radioactive containment ventilation device for nuclear power plants according to claim 1, characterized in that, The fresh air handling component (22) includes an inlet grille (221), an electric isolation valve (222), and a first filter (223), which are connected in sequence by pipes.

3. The airborne radioactive containment ventilation device for nuclear power plants according to claim 2, characterized in that, The fresh air handling function (22) also includes a fresh air conditioning component (224) for regulating the temperature and humidity of the ventilation and an air supply manifold (225) for collecting and distributing the supplied air. The fresh air conditioning component (224) and the air supply manifold (225) are connected by the pipe.

4. The airborne radioactive containment ventilation device for nuclear power plants according to claim 3, characterized in that, The fresh air handling function component (22) also includes a measuring instrument (226), which is connected to the air supply box (225) and the outside atmosphere respectively to measure the outdoor fresh air temperature and the temperature and humidity of the supplied air.

5. The airborne radioactive containment ventilation device for nuclear power plants according to claim 1, characterized in that, The air supply / exhaust and negative pressure regulating functional component (32) includes an air supply component (321), a negative pressure regulating component (322), and an exhaust component (323). The air supply component (321) is connected to the factory building (3222) through a pipe to drive the fresh air after it has been treated by the fresh air handling component to flow to the factory building (3222). The negative pressure regulating component (322) is connected to the plant (3222) to regulate the pressure inside the plant (3222); The exhaust component (323) is connected to the factory building (3222) through a pipe, driving the ventilation of the factory building (3222) to exhaust and filter aerosols and impurities in the exhaust air.

6. The airborne radioactive containment ventilation device for nuclear power plants according to claim 5, characterized in that, The supply / exhaust and negative pressure regulating function (32) also includes a pressure gauge (324), which is connected to the supply air component (321), the negative pressure regulating component (322) and the exhaust air component (323) respectively, to detect the pressure at the outlet of the supply air fan (3212), inside the plant (3222), inside the pipe between the plant and the exhaust air fan (3232), and at the inlet of the exhaust air fan (3232).

7. A group control method for a nuclear power plant airborne radioactive containment ventilation system according to any one of claims 1 to 6, characterized in that, Includes the following steps: S1. The operator sets the subgroups under the control of the global group control module (1) to "automatic" state through the global group control module (1), and manually sets the operating conditions of the global group control module (1) through the global group control module (1). The global group control module (1) sends control instructions to the fresh air treatment group control module (21). The fresh air treatment group control module (21) controls the fresh air treatment function (22) to operate according to the instructions, so as to treat the outdoor fresh air flowing to the factory (3222). S2. The global group control module (1) sends control commands to the supply / exhaust ventilation and negative pressure regulation group control module (31). The supply / exhaust ventilation and negative pressure regulation group control module (31) controls the operation of the supply / exhaust ventilation and negative pressure regulation functional component (32) according to the commands, so as to control the ventilation flow rate in the plant (3222) and regulate the pressure in the plant (3222). S3. The global group control module (1) sends a control command to the purification group control module (41), and the purification group control module (41) controls the operation of the purification function (42) to remove the airborne radioactivity in the exhaust when airborne radioactive contamination occurs in the plant (3222).

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