A control system and method for rotating operation of a nuclear power plant fresh air system

Abstract

The application discloses a kind of nuclear power plant fresh air system rotation operation control system and method, the control system includes: rotation control module, temperature measuring device, electric control device and two groups of fresh air system, rotation control module is used to determine the preferred condition of fresh air system;Temperature measuring device is used to detect the ambient temperature of diesel engine hall;Electric control device is connected with rotation control module and temperature measuring device respectively, and electric control device is used to output control instruction according to preferred condition and ambient temperature;Fresh air system is connected with electric control device, and fresh air system is used to execute corresponding operation according to the control instruction output by electric control device.The control system and method of the application can realize automatic rotation under single group, two groups of fresh air system operation mode, can effectively balance the operation time length of two groups of fresh air system, improve the service life of fresh air system.

Description

Technical Field

[0001] This invention relates to the field of nuclear power plant fresh air system control technology, and more specifically, to a control system and method for the rotating operation of a nuclear power plant fresh air system. Background Technology

[0002] The diesel engine room of a nuclear power plant is equipped with two sets of fresh air systems. Fresh air, after being filtered, silenced, and cooled, is delivered into the diesel engine room by a blower. Exhaust air is discharged to the air-cooled radiator room via an exhaust fan and silencer. A temperature measuring device is also installed in the diesel engine room to monitor the ambient temperature. Generally, both sets of fresh air systems operate automatically, starting in a predetermined sequence. Typically, operating one set of systems is sufficient to meet operational requirements. This can lead to frequent activation of one set of systems, resulting in an uneven utilization rate between the two sets and impacting the lifespan of the fresh air systems.

[0003] Existing patent CN208059196U discloses a fresh air system control system, which aims to overcome the problem that existing fresh air system control systems cannot be applied to multiple operating modes. The system includes a main controller housed in a sealed housing and a control panel mounted on the housing. The main controller includes a network control module capable of network connection to achieve stand-alone offline operation, stand-alone network operation, and multi-unit network + MPU intelligent control center linkage operation; a sensor module for collecting real-time indoor and outdoor temperature and indoor CO2 concentration data; and a damper control module that automatically switches between three different operating modes—bidirectional flow, unidirectional flow, and internal circulation—in free mode. As can be seen from the above description, this patent does not solve the problems of uneven utilization of fresh air systems and the difficulty in adapting control logic to diverse application scenarios in existing technologies.

[0004] Existing patent CN116221082A discloses a control system for the automatic rotation of sump pumps in a nuclear power plant. This system includes a liquid level measuring device, an electrical control device, and two sump pumps. The liquid level measuring device detects the liquid level of non-radioactive wastewater in the sump. The electrical control device is connected to the liquid level measuring device and includes two bistable triggers. The electrical control device outputs control commands for the sump pumps in the next operating cycle based on the liquid level and the two bistable triggers. The two sump pumps are connected to the electrical control device and execute corresponding operations according to the control commands. This solution addresses the problem of automatic rotation of sump pumps. However, the input conditions of the control system are fixed, the conditions are highly constrained, and the control logic has poor scalability and portability, making it difficult to adapt to diverse application scenarios.

[0005] In summary, neither of the two existing patents mentioned above has solved the problems of uneven utilization of fresh air systems and the difficulty in adapting control logic to diverse application scenarios in the prior art. Summary of the Invention

[0006] Based on the above-mentioned technical problems, this invention proposes a control system and method for the rotating operation of a fresh air system in a nuclear power plant, which solves the problems of uneven utilization of fresh air systems and difficulty in applying control logic to various application scenarios in the prior art.

[0007] To achieve the above objectives, this invention proposes a control system for the rotating operation of a fresh air system in a nuclear power plant.

[0008] A control system for the rotating operation of a fresh air system in a nuclear power plant includes: a rotating control module, a temperature measuring device, an electrical control device, and two sets of fresh air systems.

[0009] The rotation control module is used to determine the optimal conditions for the fresh air system;

[0010] Temperature measuring device for detecting the ambient temperature in the diesel engine room;

[0011] The electronic control device is connected to the rotation control module and the temperature measurement device respectively. The electronic control device is used to output control commands according to the preferred conditions and ambient temperature.

[0012] The fresh air system is connected to the electronic control device, and the fresh air system is used to perform corresponding operations according to the control commands output by the electronic control device.

[0013] Furthermore, the rotation control module includes: two OR gates, two time-delay off gates, one time-delay on gate, one AND gate, one single flip-flop, four NAND gates, two NOT gates, and one bistable flip-flop;

[0014] The first OR gate is connected to the first delay gate and is used to receive the operating status of the first fresh air system and the operating status of the second fresh air system, and to perform an OR operation on the above operating status to generate a first output result.

[0015] The second OR gate is connected to the first AND gate and is used to receive the first fresh air system stop command and the second fresh air system stop command, and to perform an OR operation on the above commands to generate a second output result;

[0016] The first delay gate is connected to the first OR gate and the first AND gate respectively, and is used to delay and turn off the first output result;

[0017] The first AND gate is used to receive the first output result, the second output result, and the enable rotation control signal after the first delay is turned off, and to perform an AND operation on the above signals to generate the third output result;

[0018] The single flip-flop is connected to the first AND gate and the first NAND gate respectively to delay the third output result;

[0019] The first NAND gate is connected to the single flip-flop and the second delay gate respectively. It is used to receive the output result of the single flip-flop and the output result after being delayed by the second delay gate, and to perform NAND operation on the above signals to generate the fourth output result.

[0020] The second NAND gate is connected to the second delay gate and the first NAND gate respectively, and is used to receive the output result after being delayed by the second delay gate and the fourth output result, and to perform NAND operation on the above signals to generate the fifth output result;

[0021] The third NAND gate is connected to the single flip-flop and the first NAND gate respectively, and is used to receive the third and fourth output results after the single flip-flop delay, and perform NAND operation on the above signals to generate the sixth output result.

[0022] The fourth NAND gate is connected to the second and third NAND gates respectively, and is used to receive the fifth and sixth output results, and perform NAND operations on the above signals to generate the seventh output result;

[0023] The delay gate is connected to the fourth NAND gate and the first NOT gate respectively, and is used to delay the output of the seventh output result.

[0024] The first NOT gate receives the seventh output result after delay and opening delay, and performs NOT operation on the above signal to generate the eighth output result;

[0025] The bistable multi-trigger is connected to the delay-open gate and the first NOT gate respectively, and is used to receive the seventh and eighth output results after the delay-open gate;

[0026] The second delay switch is connected to the bistable trigger and is used to delay and turn off the output of the bistable trigger.

[0027] The second NOT gate is connected to the second delay switch and the first fresh air system respectively. It is used to receive the output result of the bistable trigger after being delayed by the second delay switch, and to perform a NOT operation on the output result of the bistable trigger to generate the ninth output result.

[0028] The second fresh air system is connected to the second delay switch.

[0029] Furthermore, the temperature measuring device includes low temperature, high temperature, and high temperature threshold detection modules.

[0030] Furthermore, the electrical control device includes a control device and a power distribution device. The control device is used to output control commands for the fresh air system and to collect data on the operating status of the fresh air system; the power distribution device is used to supply power to the control system.

[0031] Furthermore, it also includes: a rotation monitoring module, which is connected to the rotation control module. The rotation monitoring module receives the rotation operation status of the two sets of fresh air systems provided by the rotation control module and displays the rotation operation status.

[0032] Furthermore, the signal delay duration of the first delay switch is 2 seconds.

[0033] Furthermore, the signal delay duration for the delay on and the second delay off is 3 seconds.

[0034] Furthermore, the bistable trigger is an RS trigger.

[0035] Furthermore, when the rotation control signal is 1, the control logic of the rotation control module takes effect.

[0036] To achieve the same objective as the methods described above, this invention also proposes a control method for the rotational operation of a nuclear power plant's fresh air system.

[0037] A control method for the rotating operation of a fresh air system in a nuclear power plant, the method being applied to the aforementioned control system, the method comprising:

[0038] Optimal conditions for receiving the fresh air system and the ambient temperature of the diesel engine room;

[0039] Output control commands based on preferred conditions and ambient temperature;

[0040] Control the fresh air system to perform corresponding operations according to the control commands.

[0041] Based on the above technical solution, the present invention has at least the following beneficial effects:

[0042] 1. This invention, by setting up a rotation control module, uses the operating status of the fresh air system, stop command, and allow rotation control signal as inputs to participate in the operation of the rotation control logic. It can achieve automatic rotation in both single-group and two-group fresh air system operation modes, balancing the operation time of the two groups of fresh air systems and improving the service life of the fresh air system. In addition, this invention can also adjust the allow rotation control conditions to participate in the rotation control logic operation to adapt to different application scenarios and improve the flexibility of the control system and method.

[0043] 2. This invention utilizes a first delay switch to ensure that after the fresh air system stops issuing a stop command, its operating status signal is delayed by 2 seconds before disappearing. This allows the first AND gate to simultaneously receive the operating status and stop command of the fresh air system. In other words, this method detects the signal indicating the end of an operating cycle and switches the preferred conditions after each operating cycle ends, thereby achieving the alternating control of the two sets of fresh air systems.

[0044] 3. By setting up a rotation monitoring module to receive and display the status information transmitted by the rotation control module, this invention can monitor the rotation operation status of the fresh air system, making it easy to grasp the working status of the equipment in a timely manner. Attached Figure Description

[0045] The accompanying drawings, which form part of this specification, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0046] Figure 1 This is a schematic diagram of a control system for the rotating operation of a fresh air system in a nuclear power plant, according to an embodiment of the present invention.

[0047] Figure 2 This is a schematic diagram of the control logic of a rotation control module according to an embodiment of the present invention;

[0048] Figure 3 This is a schematic diagram of a computerized integrated module for the rotation control logic in another embodiment of the present invention;

[0049] Figure 4 This is a schematic diagram of the state of the rotation monitoring module when rotation control is not enabled in one embodiment of the present invention;

[0050] Figure 5 This is a schematic diagram of the status of the rotation monitoring module when rotation control is enabled, preferably in fresh air system A, according to one embodiment of the present invention;

[0051] Figure 6 This is a schematic diagram of the status of the rotating monitoring module when a single fresh air system (preferably fresh air system A) is put into operation in one embodiment of the present invention.

[0052] Figure 7 This is a schematic diagram showing the status of the rotating monitoring module when two sets of fresh air systems are put into operation in one embodiment of the present invention;

[0053] Figure 8 This is a schematic diagram of the status of the rotating monitoring module when the fresh air system is stopped, preferably when the fresh air system is switched to fresh air system B, in one embodiment of the present invention;

[0054] Figure 9 This is a schematic diagram of the status of the rotating monitoring module during the operation of a single fresh air system in one embodiment of the present invention.

[0055] Figure 10 This is a flowchart illustrating a monitoring method for the rotating operation of a nuclear power plant's fresh air system, according to an embodiment of the present invention.

[0056] The above figures include the following reference numerals:

[0057] 100. Rotation control module; 111. First OR gate; 112. Second OR gate; 121. First delay off; 122. Second delay off; 131. Delay on; 141. First AND gate; 151. Single trigger; 161. First NAND gate; 162. Second NAND gate; 163. Third NAND gate; 164. Fourth NAND gate; 171. First NOT gate; 172. Second NOT gate; 181. RS trigger; 200. Temperature measuring device; 300. Electrical control device; 400. Fresh air system; 500. Rotation monitoring module. Detailed Implementation

[0058] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0059] The present invention will be further described in detail below with reference to specific embodiments, which should not be construed as limiting the scope of protection claimed by the present invention.

[0060] Example

[0061] To address the issues of uneven utilization rates and difficulty in adapting control logic to diverse application scenarios in existing technologies, this invention proposes a control system and method for the rotating operation of a nuclear power plant's fresh air system.

[0062] To achieve the above objectives, this invention proposes a control system for the rotating operation of a fresh air system in a nuclear power plant.

[0063] like Figure 1 The diagram shows a schematic of a control system for the rotating operation of a nuclear power plant's fresh air system, according to an embodiment of the present invention. Figure 1 As shown, the control system includes: a rotation control module 100, a temperature measuring device 200, an electronic control device 300, and a fresh air system 400. The rotation control module 100 is used to determine the optimal conditions for the fresh air system; the temperature measuring device 200 is used to detect the ambient temperature of the diesel engine room; the electronic control device 300 is connected to both the rotation control module 100 and the temperature measuring device 200, and is used to output control commands based on the optimal conditions and the ambient temperature. The fresh air system 400 is connected to the electronic control device 300, and is used to execute corresponding operations based on the control commands output by the electronic control device 300.

[0064] Figure 2 The diagram shows a control logic schematic of the rotation control module in one embodiment of the present invention, such as... Figure 2As shown, this embodiment includes a fresh air system A and a fresh air system B. The rotation control module 100 can be implemented by a DCS (Distributed Control System) or by other control devices. The rotation control module 100 specifically includes: two OR gates, two time-delayed turn-off gates, one time-delayed turn-on gate, one AND gate, one single flip-flop, four NAND gates, two NOT gates, and one bistable flip-flop. The following will provide a detailed description of the connections, functions, and logic control methods between the components.

[0065] The first OR gate 111 is connected to the first delay gate 121, and is used to receive the operating status of fresh air system A and fresh air system B, and perform an OR operation on the received operating status to generate a first output result. The first delay gate 121 is connected to the first OR gate 111 and the first AND gate 141 respectively, and is used to delay the closing of the first output result. In the initial state, the operating status of fresh air system A and fresh air system B are both 0.

[0066] For example, after the temperature measuring device 200 detects the ambient temperature of the current diesel engine room and generates a high temperature signal, the fresh air system A is in operation. Since the process of the ambient temperature in the diesel engine room changing from high or high-high to low constitutes one operating cycle, when the temperature measuring device 200 generates a low temperature signal, the fresh air system A stops operating. In this scenario, the function of the first delay switch 121 is to delay the operating status signal of the fresh air system A for 2 seconds after the stop command is issued, so that the first AND gate 141 can simultaneously receive the operating status and stop command of the fresh air system A. That is, the present invention detects the signal of the end of an operating cycle through this method, and switches the preferred conditions after each operating cycle, thereby realizing the alternating control of the two sets of fresh air systems.

[0067] The second OR gate 112 is connected to the first AND gate 141 and is used to receive the stop command from fresh air system A and the stop command from fresh air system B, and to perform an OR operation on the received stop command to generate a second output result. Specifically, in the initial state, the stop commands for both fresh air system A and fresh air system B are 0.

[0068] The first AND gate 141 is used to receive the first output result, the second output result, and the enable rotation control signal after the first delay is turned off, and performs an AND operation on the above signals to generate a third output result. Specifically, in this embodiment, the enable rotation control signal is defaulted to 1, and the rotation control logic is active.

[0069] A single flip-flop 151 is connected to both a first AND gate 141 and a first NAND gate 161. When the third output of the first AND gate 141 is 1, the third output is held for a period of time T, after which the output returns to 0. A first NAND gate 161 is connected to both the single flip-flop 151 and a second delay gate 122. It receives the output of the single flip-flop 151 and the output after delay by the second delay gate 122, and performs a NAND operation on these signals to generate a fourth output. A second NAND gate 162 is connected to both the second delay gate 122 and the first NAND gate 161. It receives the output after delay by the second delay gate 122 and the fourth output, and performs a NAND operation on these signals to generate a fifth output. A third NAND gate 163 is connected to both the single flip-flop 151 and the first NAND gate 161. It receives the third and fourth outputs after delay by the single flip-flop 151, and performs a NAND operation on these signals to generate a sixth output. The fourth NAND gate 164 is connected to the second NAND gate 162 and the third NAND gate 163 respectively, and is used to receive the fifth output result and the sixth output result, and perform NAND operation on the above signals to generate the seventh output result.

[0070] Specifically, in the initial state, the operating status and stop command of both fresh air system A and fresh air system B are 0. In this embodiment, the output of the bistable trigger is 0. After the second NOT gate 172 performs a NOT operation on the input value, the preferred fresh air system A is 1, and the preferred fresh air system B is 0. Since the preferred condition of 1 indicates that the fresh air system is started first, fresh air system A is started first in the initial state.

[0071] When the temperature is high and fresh air system A is activated first, the operating state of fresh air system A is 1, and the operating state of fresh air system B is 0. When the temperature is low and fresh air systems are stopped, the stop command for fresh air system A is 1, and the stop command for fresh air system B is 0. Therefore, the third output of the first AND gate 141 is 1. Since the output of the single flip-flop received by the first NAND gate 161 is 1, and the output of the second delay switch 122 after the delay is 0, the fourth output after the NAND operation is 1. The output of the second delay switch received by the second NAND gate 162 after the delay is 0, and the fourth output is 1. Therefore, the fifth output after the NAND operation is 1. The third output of the single flip-flop 151 received by the third NAND gate 163 after the delay is 1, and the fourth output is 1. Therefore, the sixth output of the third NAND gate 163 is 0. Based on the above fifth and sixth outputs, the seventh output of the fourth NAND gate 164 is 1.

[0072] The delay switch 131 is connected to the fourth NAND gate 164 and the first NOT gate 171 respectively. In this embodiment, the delay switch 131 is triggered on the rising edge. When the seventh output result of the fourth NAND gate 164 is 1, it is output after a 3-second delay by the delay switch 131; when the seventh output result is 0, the seventh output result is output directly without further delay processing. The delay switch 131 can prevent the first NAND gate 161 from repeatedly receiving the return result of the second delay switch 122 when the single flip-flop 151 signal has not disappeared. The first NOT gate 171 receives the seventh output result after the delay by the delay switch 131 and performs a NOT operation on the above signal, generating an eighth output result, which is 0.

[0073] In this embodiment, the bistable trigger used is an RS trigger 181. This trigger is connected to a delay gate 131 and a first NOT gate 171, respectively. It receives the seventh and eighth output results after being delayed by the delay gate 131, performs calculations on the above output results, and then outputs and holds them. Specifically, when the R terminal of the RS trigger 181 is set to 1 and the S terminal is set to 0, the output of the RS trigger 181 is 0; when the R terminal is set to 0 and the S terminal is set to 1, the output of the RS trigger 181 is 1.

[0074] Furthermore, the second delay switch 122 is connected to the RS flip-flop 181. In this embodiment, the second delay switch 122 is triggered by a falling edge and is used to delay and turn off the output of the RS flip-flop 181 when the output of the RS flip-flop 181 is changed from 1 to 0. Conversely, when the output of the RS flip-flop 181 is changed from 0 to 1, no further delay processing is performed.

[0075] The second NOT gate 172 is connected to the second delay switch 122 and the fresh air system A. Since the eighth output result is 0, the output result of the RS flip-flop is 1. Based on the above description of the second delay switch 122, since the current output result of the RS flip-flop 181 is set from 0 to 1, the second delay switch 122 no longer performs delay processing on it. That is, the output result of the RS flip-flop 181 is directly output after passing through the second delay switch 122, and then after the second NOT gate 172 performs the NOT operation, the ninth output result is 0. At this time, the preferred fresh air system B is set from 0 to 1, and the preferred fresh air system A is set from 1 to 0. The fresh air system B will be started first on the next startup, completing a switching of the preferred conditions.

[0076] The aforementioned rotation control logic enables the fresh air system B to operate when the temperature measuring device 200 generates a high temperature signal, and to stop when a low temperature signal is generated, thus entering the next operating cycle. The rotation control logic calculates that the seventh output of the fourth NAND gate is 0. This result is processed by the RS flip-flop 181 and then output and held. At this time, the preferred fresh air system B is set from 1 to 0, and the preferred fresh air system A is set from 0 to 1, completing one switching of the preferred condition from fresh air system B to fresh air system A.

[0077] When a single fresh air system cannot meet the cooling requirements, causing the temperature measuring device 200 to generate a high-high temperature signal, a second fresh air system is simultaneously activated until the temperature measuring device 200 generates a low temperature signal, at which point both fresh air systems stop simultaneously. After both fresh air systems stop simultaneously, a switching of preferred conditions can be completed, with the switching logic being the same as that in the single fresh air system operation mode described above. For example, suppose that the current preferred fresh air system A does not meet the cooling requirements, and the temperature measuring device 200 generates a high-high temperature signal. At this time, fresh air system B needs to be activated simultaneously. When the temperature measuring device 200 generates a low temperature signal, both fresh air systems stop simultaneously, thus completing a switching of preferred conditions, with the preferred fresh air system switching from A to B.

[0078] Furthermore, the electrical control device 300 includes a control device and a power distribution device. The control device is used to output control commands for the fresh air system and to collect data on the operating status of the fresh air system. The power distribution device is used to supply power to the control system.

[0079] In this embodiment, the system further includes a rotation monitoring module 500, which is connected to the rotation control module 100. The rotation monitoring module 500 is used to receive and display the status information transmitted by the rotation control module. The rotation monitoring module 500 can monitor the rotation operation status of the fresh air system, making it easy to grasp the working status of the equipment in a timely manner.

[0080] Furthermore, in another embodiment of the invention, the system will Figure 2 The logic of the rotation control module shown is transformed into Figure 3 The computerized integrated module contains 5 input parameters and 3 output parameters. The definitions and configurations of the input parameters are shown in Table 1, and the definitions and configurations of the output parameters are shown in Table 2. Among them, the output parameter PAKOUT is used to send status feedback information packets to the rotating monitoring module 500, thereby realizing the monitoring of the rotating operation status on the host computer.

[0081] Table 1 Input parameters of the control logic integration module

[0082]

[0083] Table 2 Output parameters of the control logic integration module

[0084]

[0085] The information packet uses DWORD type variables. The definition and description of each parameter in the information packet are shown in Table 3:

[0086] Table 3 Definitions of PAKOUT parameters

[0087] Bit meaning illustrate 0 PERMIT CONTROL Allow rotation control 1 CHOICE A Preferred Fresh Air System A 2 CHOICE B Preferred Fresh Air System B 3 RUNNING A Fresh air system A operating status 4 RUNNING B Fresh air system B operating status 5 STOP DMD A Fresh air system A stop command 6 STOP DMD B Fresh air system B stop command 7～31 - Reserved extension bits

[0088] Figures 4 to 9 This is a schematic diagram of a rotating monitoring module according to an embodiment of the present invention. The rotating monitoring module 500 includes a rotating control display, a preferred condition display, a fresh air system status display, and editable text. The rotating monitoring module 500 can match an appropriate display style on the host computer according to the received status feedback information packet, thereby providing feedback on the rotating operation status of the fresh air system.

[0089] like Figure 4 As shown, when rotation control is not enabled, there is no highlighted display in the rotation monitoring module 500. After rotation control is enabled, "PECO" is highlighted, and the outline of the preferred fresh air system is highlighted. Figure 5 This is a status diagram of the rotating monitoring module when the fresh air system is not running, with fresh air system A being the preferred option. Figure 8 This diagram illustrates the status of the rotating monitoring module when the preferred fresh air system switches to system B while the fresh air system is not in operation. Specifically, it corresponds to the following two scenarios: First, in the single-system fresh air system A operation mode, fresh air system A stops operating, and the preferred fresh air system switches to system B; Second, if the preferred fresh air system A cannot meet the cooling requirements, the second fresh air system B is simultaneously activated. That is, in the two-system fresh air system operation mode, when both fresh air systems A and B stop operating, the preferred fresh air system switches to system B. When the fresh air system is running, the operating fresh air system is highlighted, such as... Figure 6 This is a status diagram of the rotating monitoring module during the operation of a single fresh air system (Fresh Air System A). Figure 7 This diagram illustrates the status of the rotating monitoring module for both fresh air systems A and B during operation. Figure 9 This is a schematic diagram showing the status of the rotating monitoring module when a single fresh air system B is in operation. The colors and definitions used for highlighting in the rotating monitoring module are shown in Table 4.

[0090] Table 4. Color Definition List for Rotational Monitoring Module

[0091]

[0092] Furthermore, the temperature measuring device 200 can be a resistance temperature detector (RTD) or a temperature switch. This device includes low temperature, high temperature, and high-high temperature threshold detection modules for measuring the ambient temperature of the diesel engine room and generating high temperature, high-high temperature, or low temperature signals to determine whether to activate one or both sets of fresh air systems. When the temperature measuring device 200 generates a high temperature signal, one set of fresh air systems is activated; when a low temperature signal is generated, the fresh air systems stop. If activating one set of fresh air systems cannot meet the cooling requirements, causing the temperature measuring device 200 to generate a high-high temperature signal, then a second set of fresh air systems is activated simultaneously, until a low temperature signal is generated, at which point both sets of fresh air systems stop simultaneously.

[0093] To achieve the same objective as the methods described above, this invention also proposes a control method for the rotational operation of a nuclear power plant's fresh air system.

[0094] like Figure 10 The diagram illustrates a control method for the rotating operation of a nuclear power plant's fresh air system according to an embodiment of the present invention. This method is applied to the aforementioned control system, such as... Figure 10 As shown, the method includes the following three steps:

[0095] S1 receives the preferred conditions of the fresh air system and the ambient temperature of the diesel engine hall.

[0096] S2 outputs control commands based on preferred conditions and ambient temperature.

[0097] S3 controls the fresh air system to perform corresponding operations according to the control commands.

[0098] It should be understood that the control method for the rotational operation of a nuclear power plant fresh air system is consistent with the description of the corresponding control system embodiment for the rotational operation of a nuclear power plant fresh air system, so this embodiment will not repeat it.

[0099] In summary, as can be seen from the above description, the embodiments of the present invention achieve the following technical effects:

[0100] 1. This invention, by setting up a rotation control module, uses the operating status of the fresh air system, stop command, and allow rotation control signal as inputs to participate in the operation of the rotation control logic. It can achieve automatic rotation in both single-group and two-group fresh air system operation modes, balancing the operation time of the two groups of fresh air systems and improving the service life of the fresh air system. In addition, this invention can also adjust the allow rotation control conditions to participate in the rotation control logic operation to adapt to different application scenarios and improve the flexibility of the control system and method.

[0101] 2. This invention utilizes a first delay switch to ensure that after the fresh air system stops issuing a stop command, its operating status signal is delayed by 2 seconds before disappearing. This allows the first AND gate to simultaneously receive the operating status and stop command of the fresh air system. In other words, this method detects the signal indicating the end of an operating cycle and switches the preferred conditions after each operating cycle ends, thereby achieving the alternating control of the two sets of fresh air systems.

[0102] 3. By setting up a rotation monitoring module to receive and display the status information transmitted by the rotation control module, this invention can monitor the rotation operation status of the fresh air system, making it easy to grasp the working status of the equipment in a timely manner.

[0103] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

[0104] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0105] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus or device (such as a computer-based system, a processor-included system or other system that can fetch and execute instructions from, an instruction execution system, apparatus or device).

[0106] It should be understood that various parts of the present invention can be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0107] It should be noted that, in the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

Claims

1. A control system for the rotating operation of a fresh air system in a nuclear power plant, characterized in that, include: The system includes a rotation control module, a temperature measuring device, an electrical control device, and two sets of fresh air systems. The rotation control module is used to determine the optimal conditions for the fresh air system; The temperature measuring device is used to detect the ambient temperature of the diesel engine hall. The temperature measuring device includes low temperature, high temperature and high temperature threshold detection modules. The electronic control device is connected to the rotation control module and the temperature measuring device respectively, and the electronic control device is used to output control commands according to the preferred conditions and the ambient temperature; The fresh air system is connected to the electronic control device, and the fresh air system is used to perform corresponding operations according to the control commands output by the electronic control device. A rotation monitoring module is connected to the rotation control module. The rotation monitoring module receives the rotation operation status of the two sets of fresh air systems provided by the rotation control module and displays the rotation operation status. By detecting the signal that an operating cycle has ended and switching the preferred conditions after each operating cycle, the alternating control of the two sets of fresh air systems can be achieved. The rotation control module includes: two OR gates, two delay-off gates, one delay-on gate, one AND gate, one single flip-flop, four NAND gates, two NOT gates, and one bistable flip-flop; The first OR gate is connected to the first delay gate and is used to receive the operating status of the first fresh air system and the operating status of the second fresh air system, and to perform an OR operation on the above operating status to generate a first output result. The second OR gate is connected to the first AND gate and is used to receive the first fresh air system stop command and the second fresh air system stop command, and to perform an OR operation on the above commands to generate a second output result; The first delay switch is connected to the first OR gate and the first AND gate respectively, and is used to delay and turn off the first output result; The first AND gate is used to receive the first output result, the second output result, and the allow rotation control signal after being delayed by the first delay, and to perform an AND operation on the above signals to generate a third output result; The single flip-flop is connected to the first AND gate and the first NAND gate respectively, and is used to delay the third output result; The first NAND gate is connected to the single flip-flop and the second delay gate respectively, and is used to receive the output result of the single flip-flop and the output result after being delayed by the second delay gate, and to perform NAND operation on the above signals to generate a fourth output result; The second NAND gate is connected to the second delay switch and the first NAND gate respectively, and is used to receive the output result after being delayed by the second delay switch and the fourth output result, and perform NAND operation on the above signals to generate the fifth output result; The third NAND gate is connected to the single flip-flop and the first NAND gate respectively, and is used to receive the third output result and the fourth output result after being delayed by the single flip-flop, and to perform NAND operation on the above signals to generate the sixth output result; The fourth NAND gate is connected to the second NAND gate and the third NAND gate respectively, and is used to receive the fifth output result and the sixth output result, and perform NAND operation on the above signals to generate the seventh output result; The delay switch is connected to the fourth NAND gate and the first NOT gate respectively, and is used to delay the output of the seventh output result. The first NOT gate receives the seventh output result after the delay is turned on, and performs a NOT operation on the above signal to generate the eighth output result; The bistable trigger is connected to the delay-on gate and the first NOT gate respectively, and is used to receive the seventh output result and the eighth output result after being delayed by the delay-on gate; The second delay switch is connected to the bistable trigger and is used to delay and turn off the output result of the bistable trigger. The second NOT gate is connected to the second delay switch and the first fresh air system respectively, and is used to receive the output result of the bistable trigger after being delayed by the second delay switch, and to perform a NOT operation on the output result of the bistable trigger to generate the ninth output result; The second fresh air system is connected to the second delay switch.

2. The control system according to claim 1, characterized in that, The electrical control device includes a control device and a power distribution device. The control device is used to output control commands for the fresh air system and to collect the operating status of the fresh air system. The power distribution device is used to supply power to the control system.

3. The control system according to claim 1, characterized in that, The first delay switch delays the signal for 2 seconds.

4. The control system according to claim 1, characterized in that, The signal delay duration for the delay on and the second delay off is 3 seconds.

5. The system according to claim 1, characterized in that, The bistable trigger is an RS trigger.

6. The system according to claim 1, characterized in that, When the allowed rotation control signal is 1, the control logic of the rotation control module takes effect.

7. A control method for the rotating operation of a fresh air system in a nuclear power plant, wherein the method is applied to the control system described in any one of claims 1-6, characterized in that, include: The preferred conditions of the fresh air system and the ambient temperature of the diesel engine hall are received; Output control commands based on the preferred conditions and the ambient temperature; The control commands are used to control the fresh air system to perform corresponding operations.

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