Reactor core outlet thermocouple temperature deviation experimental device and experimental method

Abstract

The invention relates to the technical field of reactors, and provides a reactor core outlet thermocouple temperature deviation experiment device and an experiment method.The reactor core outlet thermocouple temperature deviation experiment device comprises a constant temperature box and a temperature acquisition system, and a heat flow medium and a stirrer used for stirring the heat flow medium are arranged in the constant temperature box; a cold flow medium which exchanges heat with the hot flow medium is arranged outside the constant-temperature box; the temperature acquisition system comprises a first thermocouple, a positioning assembly and a second thermocouple, the first thermocouple is arranged in the heat flow medium, the positioning assembly is arranged in the thermostat, the second thermocouple is arranged in the positioning assembly, and the second thermocouple can extend out of or retract into the positioning assembly. The device can simulate the heat flow and cold flow mixed heat exchange process in a reactor, and analyzes the influence of the thermocouple installation position on the temperature measurement accuracy, thereby facilitating the improvement of the accuracy of the reactor core outlet temperature measurement, and ensuring the safe and stable operation of a nuclear power station.

Description

Technical Field

[0001] The present application relates to the field of reactor technology, and in particular provides a reactor core outlet thermocouple temperature deviation experimental device and experimental method. Background Art

[0002] In the reactor, the heat conduction process of the reactor core mainly includes the hot flow flowing out from the lower core outlet and the cold flow flowing down from the upper chamber of the reactor mixing with each other and exchanging heat before flowing out of the reactor.

[0003] The core outlet temperature (heat flow temperature) is an important indicator for monitoring the reactor status and is mainly measured by thermocouples in the core measurement system. If the thermocouple is not installed properly, the core outlet temperature at the location measured by the thermocouple will deviate from the actual temperature, which will affect the operator's judgment of the core status and further affect the safe and stable operation of the nuclear power plant. Summary of the invention

[0004] The purpose of the embodiments of the present application is to provide a reactor core outlet thermocouple temperature deviation experimental device and experimental method, aiming to solve the problem of inaccurate temperature measurement caused by improper installation of the existing reactor core outlet thermocouple.

[0005] To achieve the above purpose, the technical solution adopted in this application is:

[0006] The present application provides a reactor core outlet thermocouple temperature deviation experimental device, comprising:

[0007] A thermostatic box, wherein a hot flow medium and a stirrer for stirring the hot flow medium are arranged inside the thermostatic box, and a cold flow medium for exchanging heat with the hot flow medium is arranged outside the thermostatic box;

[0008] The temperature acquisition system includes a first thermocouple, a positioning assembly and a second thermocouple, wherein the first thermocouple is arranged in the heat flow medium, the positioning assembly is arranged in the constant temperature box, the second thermocouple is arranged in the positioning assembly, and the second thermocouple can extend or retract the positioning assembly.

[0009] The reactor core outlet thermocouple temperature deviation experimental device provided in the present application can simulate the mixed heat exchange process of hot flow and cold flow in the reactor through a constant temperature box, and can analyze the influence of the thermocouple installation position on the temperature measurement accuracy through a temperature acquisition system. Therefore, the actual installation position of the thermocouple can be adjusted or corrected according to the analysis results during the nuclear power plant reactor calibration stage, thereby improving the accuracy of the core outlet temperature measurement and ensuring the safe and stable operation of the nuclear power plant.

[0010] Optionally, the reactor core outlet thermocouple temperature deviation experimental device further includes:

[0011] A liquid level control system is connected to the thermostat and is used to adjust the liquid level of the heat flow medium in the thermostat.

[0012] Optionally, the thermostat comprises:

[0013] A box body, wherein the hot flow medium, the stirrer and the positioning assembly are arranged inside the box body, and the cold flow medium is arranged outside the box body;

[0014] A heating rod is arranged in the box;

[0015] A temperature sensor is disposed in the box;

[0016] A temperature controller is electrically connected to the heating rod and the temperature sensor respectively, and is used to control the temperature of the heat flow medium.

[0017] Optionally, the thermostat further comprises:

[0018] The clamp is arranged at the bottom of the box body and is used to fix the positioning assembly.

[0019] Optionally, the positioning component includes:

[0020] A support cylinder, arranged corresponding to the clamp;

[0021] A guide tube is arranged in the support tube, and one end of the guide tube away from the clamp is detachably connected to the support tube. An end plug is provided at one end of the guide tube adjacent to the clamp, and the end plug is detachably connected to one end of the support tube adjacent to the clamp, and the end plug is fixed on the clamp; the second thermocouple is used to be clamped in the end plug through the guide tube, and the second thermocouple can extend or retract the end plug.

[0022] Optionally, the temperature acquisition system further includes:

[0023] The third thermocouple is arranged between the support tube and the guide tube.

[0024] Optionally, the temperature acquisition system further includes:

[0025] The fourth thermocouple is arranged outside the box and is used to collect the temperature of the cold flow medium.

[0026] Optionally, the temperature acquisition system further includes:

[0027] a temperature collector, electrically connected to the first thermocouple, the second thermocouple, the third thermocouple and the fourth thermocouple respectively;

[0028] The terminal is electrically connected to the temperature collector.

[0029] The present application also provides an experimental method for a reactor core outlet thermocouple temperature deviation experimental device, comprising:

[0030] Adjusting the installation position of the second thermocouple to a set position, and controlling the mixer to operate constantly, wherein the set position has a plurality of positions;

[0031] Collecting the measured temperature of the first thermocouple and the measured temperature of the second thermocouple at each of the set positions to obtain the temperature deviation of the second thermocouple at each of the set positions;

[0032] Determining the correlation between the temperature deviation of the second thermocouple and the installation position of the second thermocouple according to the temperature deviation of the second thermocouple at each of the set positions;

[0033] The temperature deviation is the difference between the measured temperatures of the second thermocouple and the first thermocouple.

[0034] The experimental method of the reactor core outlet thermocouple temperature deviation experimental device provided in the present application studies the correlation between the temperature deviation of the second thermocouple and the installation position, so that the actual installation position of the thermocouple can be inferred according to the measured temperature deviation during the nuclear power plant reactor calibration stage, and then necessary measures can be taken to correct the installation error, thereby improving the accuracy of the core outlet temperature measurement and ensuring the safe and stable operation of the nuclear power plant.

[0035] Optionally, the experimental method of the reactor core outlet thermocouple temperature deviation experimental device further includes:

[0036] Adjusting the liquid level of the heat flux medium in the thermostat to a set height, wherein the set height has multiple values;

[0037] Adjusting the installation position of the second thermocouple to each of the set positions at each of the set heights, and controlling the mixer to operate constantly;

[0038] Collecting the measured temperature of the first thermocouple and the measured temperature of the second thermocouple at each of the set positions at each of the set heights, and obtaining the temperature deviation of the second thermocouple at each of the set positions at each of the set heights;

[0039] According to the temperature deviation of the second thermocouple at each of the set positions at each of the set heights, the correlation between the temperature deviation of the second thermocouple and the installation position of the second thermocouple and the liquid level of the heat flow medium is determined.

[0040] The experimental method of the reactor core outlet thermocouple temperature deviation experimental device provided in the present application studies the correlation between the temperature deviation of the second thermocouple and the installation position and the liquid level, so that the actual installation position of the thermocouple and the heat flow liquid level can be inferred according to the measured temperature deviation during the nuclear power plant reactor calibration stage, and then necessary measures can be taken to adjust or correct the installation position and the heat flow liquid level, thereby improving the accuracy of the core outlet temperature measurement and ensuring the safe and stable operation of the nuclear power plant. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0042] Figure 1 A schematic diagram of the structure of a reactor core outlet thermocouple temperature deviation experimental device provided in an embodiment of the present application;

[0043] Figure 2 A schematic diagram of the structure of a thermostat provided in an embodiment of the present application;

[0044] Figure 3 A schematic diagram of the structure of the temperature acquisition system provided in an embodiment of the present application;

[0045] Figure 4 A structural cross-sectional view of a positioning assembly provided in an embodiment of the present application;

[0046] Figure 5 A schematic diagram of the extension position of the second thermocouple provided in an embodiment of the present application;

[0047] Figure 6 One of the flow diagrams of the experimental method of the reactor core outlet thermocouple temperature deviation experimental device provided in the embodiment of the present application;

[0048] Figure 7 A second flow chart of an experimental method of a reactor core outlet thermocouple temperature deviation experimental device provided in an embodiment of the present application;

[0049] Figure 8 The third flow chart of the experimental method of the reactor core outlet thermocouple temperature deviation experimental device provided in the embodiment of the present application.

[0050] Among them, the reference numerals in the figure are:

[0051] 1. Constant temperature box;

[0052] 101, heat flow medium; 102, box; 103, heating rod; 104, temperature sensor;

[0053] 105, temperature controller; 106, clamp; 107, first clamp; 108, second clamp;

[0054] 2. Temperature acquisition system;

[0055] 201, a first thermocouple; 202, a positioning component; 203, a second thermocouple;

[0056] 204, support tube; 205, guide tube; 206, end plug; 207, third thermocouple;

[0057] 208. A fourth thermocouple; 209. A temperature collector; 210. A terminal. DETAILED DESCRIPTION

[0058] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0059] In the description of the embodiments of the present application, it needs to be understood that the orientations or positional relationships indicated by the terms "upper", "lower", "top", "bottom", "inside", "outside", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0060] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0061] In the embodiments of the present application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0062] In one embodiment, referring to Figures 1 to 5 As shown, the reactor core outlet thermocouple temperature deviation experimental device provided by the present application includes: a thermostat 1 and a temperature acquisition system 2. The thermostat 1 is provided with a hot flow medium 101 and a stirrer (not shown in the figure) for stirring the hot flow medium 101, and the thermostat 1 is provided with a cold flow medium for heat exchange with the hot flow medium 101; the temperature acquisition system 2 includes a first thermocouple 201, a positioning assembly 202 and a second thermocouple 203, the first thermocouple 201 is provided in the hot flow medium 101, the positioning assembly 202 is provided in the thermostat 1, the second thermocouple 203 is provided in the positioning assembly 202, and the second thermocouple 203 can extend or retract the positioning assembly 202.

[0063] In the reactor of a nuclear power plant, the thermocouple at the core outlet is used to monitor the heat flow temperature at the core outlet. If the thermocouple is not installed correctly, it may cause a deviation between the measured temperature and the actual temperature, which will affect the operator's judgment of the core status and thus affect the safe and stable operation of the nuclear power plant.

[0064] This application simulates the temperature measurement of thermocouples at different installation positions, aiming to establish the correlation (functional relationship) between the installation position of the thermocouple and its measured temperature deviation, thereby providing a method for nuclear power plants to calculate the actual installation position of the thermocouple according to the temperature deviation during the calibration phase and make adjustments to ensure that the measured temperature is as close as possible to the actual temperature of the core outlet. Specifically:

[0065] The thermostat 1 is the core part of the entire reactor core outlet thermocouple temperature deviation experimental device. The thermostat 1 is filled with a heatable heat flow medium 101, which can be water, and is equipped with a stirrer to ensure the uniformity of the heat flow medium 101. The thermostat 1 is provided with a cold flow medium (such as air) outside to simulate the cold flow in an actual reactor.

[0066] In the temperature acquisition system 2, the first thermocouple 201 is directly placed in the heat flow medium 101 in the thermostatic box 1 to measure the temperature of the heat flow medium 101, that is, the real temperature of the core outlet.

[0067] The positioning assembly 202 is located in the constant temperature box 1 and provides a fixing point for the second thermocouple 203 to ensure its stability in different extended or retracted positions.

[0068] The second thermocouple 203 is installed in the positioning assembly 202 and can be extended to simulate the thermocouple at the reactor core outlet. Different installation positions are simulated by changing the extension length thereof, thereby affecting the temperature measurement result.

[0069] Heat exchange simulation: The hot flow medium 101 in the thermostat 1 is heated to the set temperature and kept flowing evenly by the mixer, simulating the high-temperature and high-pressure heat flow flowing out of the reactor core outlet. At the same time, the cold flow medium outside the thermostat 1 represents the cold flow flowing down from the upper chamber of the reactor, and heat exchange occurs between the two.

[0070] Temperature measurement and deviation analysis: When the second thermocouple 203 is fully extended, it will directly contact the heat flow medium 101. At this time, it can accurately measure the temperature of the heat flow medium 101, which is close to the temperature measured by the first thermocouple 201. However, when the second thermocouple 203 is not fully extended, the presence of the positioning component 202 will hinder the transfer of heat to the second thermocouple 203, resulting in a measured temperature lower than the actual temperature, resulting in a temperature deviation. By adjusting the position of the second thermocouple 203 and recording the corresponding temperature difference, a functional relationship between the temperature deviation and the installation position can be established.

[0071] Through the study of the above experimental data, the actual installation position of the thermocouple can be calculated according to the measured temperature deviation during the calibration stage of the nuclear power plant reactor, so as to take necessary measures to correct the installation error, improve the accuracy of the core outlet temperature measurement, and ensure the safe and stable operation of the nuclear power plant.

[0072] Therefore, the reactor core outlet thermocouple temperature deviation experimental device provided in the embodiment of the present application not only helps to deeply understand the influence of the thermocouple installation position on temperature measurement, but also provides an effective method to improve the measurement accuracy, which is of great significance for improving the safety and efficiency of nuclear power plant operations.

[0073] In one embodiment, the reactor core outlet thermocouple temperature deviation experimental device further includes: a liquid level control system (not shown in the figure), which is connected to the thermostat 1 and is used to adjust the liquid level of the heat flow medium 101 in the thermostat 1.

[0074] During the reactor core outlet temperature measurement process, if the hot and cold turbulence of heat exchange is at different liquid levels, the core outlet temperature measurement at the location of the thermocouple will also be inaccurate. In order to deal with the impact of hot and cold turbulence on the accuracy of core outlet temperature measurement at different liquid levels, the core outlet thermocouple temperature deviation experimental device in this embodiment introduces a liquid level control system. The main purpose of this system is to simulate the hot and cold turbulence conditions at different liquid levels in the reactor and study its impact on the thermocouple temperature measurement results. Specifically:

[0075] The structure of the liquid level control system is not particularly limited, as long as it can play the role of liquid level control. In one example, the liquid level control system may include components such as a pump, a water inlet pipe, a water inlet valve, a drainage pipe, a drainage valve, a liquid level sensor, and a controller. The pump is connected to the thermostat 1 through the water inlet pipe, the water inlet valve is arranged on the water inlet pipe, the drainage pipe is connected to the thermostat 1, the drainage valve is arranged on the drainage pipe, the liquid level sensor is arranged in the thermostat 1, and the controller is connected to the pump, the water inlet valve, the drainage valve, the liquid level sensor, and other components to control the liquid level of the heat flow medium in the thermostat 1.

[0076] Specifically, when the liquid level needs to be raised, the controller opens the water inlet valve and increases the water inlet through the pump; conversely, if the liquid level needs to be lowered, the drain valve is opened to release an appropriate amount of heat flow medium. The liquid level sensor continuously feeds back the current liquid level information to the controller to ensure that the actual liquid level is always within the set range.

[0077] By precisely controlling the water inlet and outlet processes, the core outlet thermocouple temperature deviation experimental device can maintain a stable liquid level under different experimental conditions, thereby accurately simulating different hot and cold turbulent liquid level positions in the reactor. This helps to more realistically reflect the complex heat exchange environment inside the reactor and improve the representativeness and applicability of the experimental data.

[0078] Combined with the data from thermocouples at different installation positions, the application of the level control system allowed the researchers to record the temperature readings of the thermocouples when they reached a steady state at different liquid level heights. This made it possible to analyze and determine that the temperature deviation of the thermocouples was not only related to the installation position, but also affected by the liquid level of the heat flow medium.

[0079] By comparing the temperature deviation of the second thermocouple 203 at different installation positions and different liquid level heights, a functional relationship between the temperature deviation and these two variables can be established. This relationship provides a scientific basis for correcting the thermocouple installation error and ensures that the core outlet temperature can be accurately measured even under complex conditions.

[0080] Therefore, the embodiment of the present application can further enhance the research depth of the core outlet temperature measurement through the liquid level control system, especially the in-depth discussion of the influence of cold and hot turbulence at different liquid level heights. This not only enriches the function of the core outlet thermocouple temperature deviation experimental device, but also provides strong data support for improving the safety and efficiency of nuclear power plant operation.

[0081] In one embodiment, referring to Figure 1 and Figure 2As shown, the thermostatic box 1 includes: a box body 102, a heating rod 103, a temperature sensor 104 and a temperature controller 105. The box body 102 is provided with a hot flow medium 101, a stirrer and a positioning assembly 202, and a cold flow medium is provided outside the box body 102; the heating rod 103 is provided in the box body 102; the temperature sensor 104 is provided in the box body 102; the temperature controller 105 is electrically connected to the heating rod 103 and the temperature sensor 104 respectively, and is used to control the temperature of the hot flow medium 101.

[0082] In this embodiment, the box body 102 serves as the main container of the entire thermostatic box 1, and is provided with a stirrer inside to make the hot flow medium 101 in the thermostatic box 1 flow, and heat exchange occurs between the hot flow medium 101 in the box body 102 and the external cold flow medium to simulate the actual working conditions in the reactor, that is, the process of mixing and exchanging heat between the hot flow flowing out of the lower core outlet and the cold flow in the upper chamber.

[0083] The heating rod 103 is installed in the box 102 to directly heat the heat flow medium 101. The temperature sensor 104 is set in the box 102 to monitor the actual temperature of the heat flow medium 101 in real time. The temperature controller 105 is electrically connected to the heating rod 103 and the temperature sensor 104 respectively to form a closed-loop control system. According to the signal provided by the temperature sensor 104, the working state of the heating rod 103 is automatically adjusted (such as on or off), so as to accurately control the temperature of the heat flow medium 101 and keep it within the set range.

[0084] Specifically, the temperature sensor 104 continuously monitors the temperature of the heat flow medium 101 and transmits the data to the temperature controller 105. When it is detected that the temperature is lower than the set value, the temperature controller 105 starts the heating rod 103 until the temperature rises to the set value; conversely, when the temperature exceeds the set value, the temperature controller 105 stops the heating rod 103 to prevent the temperature from being too high. Through the above process, the temperature of the heat flow medium 101 can be accurately controlled to keep it in a relatively constant state, which provides a reliable heat source condition for the subsequent temperature deviation experiment.

[0085] Therefore, the constant temperature box design of the embodiment of the present application provides a stable and controllable high-temperature environment for studying the temperature deviation of the core outlet thermocouple, which helps to more accurately simulate and analyze the impact of different installation positions and liquid level heights on temperature measurement, thereby improving the safety and reliability of nuclear power plant operation.

[0086] In one embodiment, referring to Figure 1 and Figure 2 As shown, the thermostatic box 1 further includes: a clamp 106 , which is disposed at the bottom of the box body 102 and is used to fix the positioning assembly 202 .

[0087] In this embodiment, the fixture 106 is installed at the bottom of the box 102 to fix the positioning assembly 202 to ensure that it will not move or loosen during the experiment. The design of the fixture 106 takes into account the convenience and stability of operation, making the installation, adjustment and removal of the positioning assembly 202 easier.

[0088] For example, the clamp 106 may include a first clamping member 107 and a second clamping member 108 arranged side by side, and the first clamping member 107 and the second clamping member 108 can be relatively close to or far away from each other to adapt to different sizes of positioning components 202. The distance between the two can be adjusted, and the clamping and loosening functions can be achieved manually or mechanically, so as to conveniently complete the installation and adjustment of the positioning component 202.

[0089] Specifically, when the positioning assembly 202 needs to be installed, the operator can first adjust the first clamping member 107 and the second clamping member 108 to an appropriate distance, place the positioning assembly 202, and then gradually reduce the distance between the two until the positioning assembly 202 is firmly clamped. If the position of the positioning assembly 202 needs to be adjusted or replaced, the reverse operation is only required, that is, the distance between the first clamping member 107 and the second clamping member 108 is increased, the positioning assembly 202 is released, and then readjusted or replaced as needed.

[0090] Therefore, the design of the fixture 106 in the embodiment of the present application not only provides a stable fixing platform for the positioning assembly 202, but also greatly improves the operating convenience and adaptability of the core outlet thermocouple temperature deviation experimental device. This helps to improve the experimental efficiency and ensure the accuracy and reliability of the experimental data, which is of great significance for studying the core outlet thermocouple temperature deviation.

[0091] In one embodiment, referring to Figure 1 and Figure 4 As shown, the positioning assembly 202 includes: a support tube 204, a guide tube 205 and an end plug 206. The support tube 204 is arranged corresponding to the fixture 106; the guide tube 205 is arranged in the support tube 204, and the end of the guide tube 205 away from the fixture 106 is detachably connected to the support tube 204, and the end of the guide tube 205 adjacent to the fixture 106 is provided with an end plug 206, and the end plug 206 is detachably connected to the end of the support tube 204 adjacent to the fixture 106, and the end plug 206 is fixed on the fixture 106; the second thermocouple 203 is used to be clamped in the end plug 206 through the guide tube 205, and the second thermocouple 203 can extend or retract the end plug 206.

[0092] In this embodiment, the positioning assembly 202 is designed to provide a stable and adjustable platform for precisely controlling the position of the second thermocouple 203 and ensuring that it remains stable during the experiment. Specifically:

[0093] The support tube 204 is located above the fixture 106 and serves as the basic structure of the entire positioning assembly 202. The guide tube 205 is disposed inside the support tube 204, and the upper end of the guide tube 205 is detachably connected to the support tube 204. The support tube 204 can prevent the guide tube 205 from shaking, ensure stability, and avoid affecting the temperature measurement. The function of the guide tube 205 is to provide a guide path for the second thermocouple 203, ensuring that the second thermocouple 203 can be accurately extended or retracted in a straight line direction to avoid measurement errors caused by offset.

[0094] The end plug 206 can be welded to the lower end of the guide tube 205 and threadedly connected to the inner wall of the lower end of the support tube 204. The end plug 206 not only serves as a positioning and guide structure for the second thermocouple 203, but is also fixed by the clamp 106 to ensure that the second thermocouple 203 remains stable in different positions. The end plug 206 is designed to be easy to disassemble and install, and it is convenient to adjust the position of the second thermocouple 203.

[0095] The second thermocouple 203 is clamped in the end plug 206 via the guide tube 205 and can extend or retract the end plug 206. This design of the second thermocouple 203 allows its extension length to be flexibly adjusted to simulate different installation positions, thereby studying the influence of temperature deviation.

[0096] When the second thermocouple 203 needs to be installed, first insert the second thermocouple 203 through the guide tube 205 and clamp it into the end plug 206 to ensure that it is in the required position, then screw the end plug 206 on the support tube 204, and fix the guide tube 205 to the support tube 204, and finally clamp the end plug 206 by the clamp 106. If the position of the second thermocouple 203 needs to be changed, the clamp 106 can be loosened to remove the guide tube 205 and the end plug 206 from the support tube 204. Next, adjust the extension or retraction length of the second thermocouple 203 in the end plug 206, reinstall the guide tube 205 and the end plug 206 after completing the position adjustment, and tighten the clamp 106.

[0097] After the second thermocouple 203 is positioned, it can perform stable temperature measurement at different liquid levels and installation positions through the guidance of the guide tube 205 and the positioning of the end plug 206, and record the temperature data under steady-state conditions.

[0098] Therefore, the positioning assembly 202 of the embodiment of the present application not only provides a stable installation platform for the second thermocouple 203, but also realizes convenient position adjustment through ingenious structural design. This helps to improve the operating convenience and measurement accuracy of the core outlet thermocouple temperature deviation experimental device, which is of great significance for in-depth research on the core outlet thermocouple temperature deviation.

[0099] In one embodiment, referring to Figure 1 and Figure 3 As shown, the temperature acquisition system 2 further includes: a third thermocouple 207 , and the third thermocouple 207 is disposed between the support tube 204 and the guide tube 205 .

[0100] Specifically, the third thermocouple 207 is located in the area between the support tube 204 and the guide tube 205, where there is almost no heat flow medium, such as dead water. By measuring the temperature in this area, information different from the temperature of the mainstream heat flow medium can be obtained, which helps to more fully understand the thermal distribution of the entire system.

[0101] Therefore, by introducing the third thermocouple 207, the temperature acquisition system 2 in the embodiment of the present application can not only more comprehensively reflect the temperature distribution in the constant temperature box 1, but also provide more abundant data support for studying the temperature deviation of the core outlet thermocouple, which helps to improve the safety and efficiency of nuclear power plant operation.

[0102] In one embodiment, referring to Figure 1 and Figure 3 As shown, the temperature acquisition system 2 further includes: a fourth thermocouple 208, which is disposed outside the box 102 and is used to collect the temperature of the cold flow medium.

[0103] In this embodiment, the fourth thermocouple 208 is installed outside the box 102, directly in contact with the cold flow medium (such as the atmosphere), and is used to measure the temperature of the cold flow medium. This setting can simulate the cold flow conditions of the upper chamber of the reactor and provide data for comparison with the internal hot flow medium temperature.

[0104] Therefore, by introducing the fourth thermocouple 208, the temperature acquisition system 2 of the present application embodiment can not only more comprehensively reflect the temperature distribution inside and outside the thermostat 1, but also provide more abundant data support for studying the temperature deviation of the thermocouple at the core outlet. This helps to improve the safety and efficiency of nuclear power plant operation, and provides a scientific basis for improving the installation of thermocouples and temperature measurement methods.

[0105] In one embodiment, referring to Figure 1 and Figure 3 As shown, the temperature acquisition system 2 also includes: a temperature collector 209 and a terminal 210 , the temperature collector 209 is electrically connected to the first thermocouple 201 , the second thermocouple 203 , the third thermocouple 207 and the fourth thermocouple 208 respectively; the terminal 210 is electrically connected to the temperature collector 209 .

[0106] In this embodiment, the temperature collector 209 can be electrically connected to the four thermocouples through the ports, and its main function is to convert the analog electrical signals collected by each thermocouple into digital signals and perform preliminary data processing and storage. The temperature collector 209 can have multi-channel input capabilities and can process data from multiple thermocouples at the same time to ensure synchronization and accuracy.

[0107] The terminal 210 can be a computer, a mobile phone or other device, which can be electrically connected to the temperature collector 209 through the RS485 communication protocol to achieve remote data transmission and interaction. The terminal 210 can be responsible for real-time monitoring, storage, and analysis and processing of temperature data transmitted from the temperature collector 209, and provide a user interface for the operator to view and manage experimental data. The terminal 210 can also set an alarm threshold, and automatically issue an alarm when an abnormal temperature is detected, reminding the operator to take corresponding measures.

[0108] When working, the temperature collector 209 receives the electrical signals from each thermocouple, converts them into digital signals, and sends the processed digital signals to the terminal 210 through the RS485 communication protocol. After receiving the temperature data, the terminal 210 uses the built-in software to perform further analysis and processing, and generates charts or reports to help researchers intuitively understand the temperature change trend. In addition, the terminal 210 can also store historical data for a long time, which is convenient for subsequent research and reference.

[0109] Therefore, by introducing the temperature collector 209 and the terminal 210, the temperature acquisition system 2 of the present application embodiment not only realizes the centralized management and efficient processing of multiple thermocouple data, but also provides researchers with a convenient data analysis tool, which helps to improve the safety and efficiency of nuclear power plant operation. This system provides strong technical support for in-depth research on the temperature deviation of the core outlet thermocouple, ensuring the accuracy and reliability of the experimental data.

[0110] The following continues to describe the experimental method of the above-mentioned reactor core outlet thermocouple temperature deviation experimental device provided by the present application.

[0111] In one embodiment, referring to Figure 6 As shown, the experimental method of the reactor core outlet thermocouple temperature deviation experimental device provided in the present application mainly includes the following steps:

[0112] S601, adjusting the installation position of the second thermocouple 203 to a set position, and controlling the mixer to run constantly, and there are multiple set positions.

[0113] like Figure 5As shown, the second thermocouple 203 can be adjusted to four preset positions, including a first position P1 that is fully extended, a second position P2 that is half extended, a third position P3 that is not extended but at the bottom of the internal channel of the end plug 206, and a fourth position P4 that is not extended but at the upper part of the internal channel of the end plug 206. The internal channel of the end plug 206 is used to clamp the second thermocouple 203.

[0114] Make sure that after each position adjustment, the device (including the mixer) reaches a stable state to ensure the validity of the measurement results. During this process, keep the mixer running constantly to simulate the fluid movement under actual working conditions.

[0115] S602 , collecting the measured temperature of the first thermocouple 201 and the measured temperature of the second thermocouple 203 at each set position, and obtaining the temperature deviation of the second thermocouple 203 at each set position.

[0116] For each position of the second thermocouple 203, the temperature readings of the first thermocouple 201 and the second thermocouple 203 under the current setting are recorded after the device is stabilized. The first thermocouple 201 serves as a reference point for the temperature of the heat flux medium 101 (simulating the actual temperature of the core outlet), providing a relatively stable temperature reference for comparing different measurements of the second thermocouple 203 under the same environment.

[0117] S603 , determining the correlation between the temperature deviation of the second thermocouple 203 and the installation position of the second thermocouple 203 according to the temperature deviation of the second thermocouple 203 at each set position.

[0118] The temperature deviation at each position is calculated, that is, the difference between the measured temperature of the second thermocouple 203 and the measured temperature of the first thermocouple 201. A statistical analysis (such as regression analysis) or a mathematical model can be used to establish a functional relationship between the temperature deviation and the installation position. Based on the analysis results, a conclusion is drawn on how to select the best installation position to minimize the temperature deviation.

[0119] Therefore, the experimental method of the reactor core outlet thermocouple temperature deviation experimental device provided in the embodiment of the present application can effectively evaluate the influence of the installation position of the second thermocouple 203 on the temperature measurement accuracy, provide a scientific basis for optimizing the thermocouple arrangement, and thus improve the performance of the temperature monitoring system in nuclear power plants or other high temperature environments.

[0120] In one embodiment, referring to Figure 7 As shown, the experimental method of the reactor core outlet thermocouple temperature deviation experimental device provided in the present application mainly includes the following steps:

[0121] S701, adjusting the liquid level of the heat flow medium 101 in the constant temperature box 1 to a set height, wherein the set height has multiple values.

[0122] The liquid level control system can be used to adjust the liquid level of the heat flow medium 101 in the thermostat 1 to a plurality of preset height values ​​for simulating the height of the hot and cold turbulent flow positions. The set heights can include: flush position with the support tube 204, three-quarters, one-half, and one-quarter of the height of the support tube 204. After each adjustment, wait until a stable state is reached to ensure that changes in the liquid level will not cause other unnecessary fluctuations.

[0123] S702, adjusting the installation position of the second thermocouple 203 to each set position at each set height, and controlling the mixer to operate constantly.

[0124] like Figure 5 As shown, at each set height, the second thermocouple 203 can be adjusted to four preset positions, including a first position P1 that is fully extended, a second position P2 that is half extended, a third position P3 that is not extended but at the bottom of the internal channel of the end plug 206, and a fourth position P4 that is not extended but at the upper part of the internal channel of the end plug 206. The internal channel of the end plug 206 is used to clamp the second thermocouple 203.

[0125] Make sure that after each position adjustment, the device (including the mixer) reaches a stable state to ensure the validity of the measurement results. During this process, keep the mixer running constantly to simulate the fluid movement under actual working conditions.

[0126] S703 , collecting the measured temperature of the first thermocouple 201 and the measured temperature of the second thermocouple 203 at each set position at each set height, and obtaining the temperature deviation of the second thermocouple 203 at each set position at each set height.

[0127] At different liquid level heights, for each position of the second thermocouple 203 , the temperature readings of the first thermocouple 201 and the second thermocouple 203 are recorded, so as to obtain the temperature deviation therebetween.

[0128] S704 , determining the correlation between the temperature deviation of the second thermocouple 203 and the installation position of the second thermocouple 203 and the liquid level of the heat flow medium 101 according to the temperature deviation of the second thermocouple 203 at each set position at each set height.

[0129] The temperature deviation under each combination of liquid level height and installation position is calculated, and the temperature deviation is the difference between the measured temperature of the second thermocouple 203 and the measured temperature of the first thermocouple 201. Statistical analysis (such as multivariate regression analysis) or mathematical model can be used to establish the functional relationship between temperature deviation and installation position and liquid level. Based on the analysis results, a conclusion is drawn on how to select the best installation position and liquid level to minimize the temperature deviation.

[0130] Therefore, the experimental method of the reactor core outlet thermocouple temperature deviation experimental device provided in the embodiment of the present application can more comprehensively evaluate the influence of the installation position of the second thermocouple 203 and the liquid level of the heat flow medium on the temperature measurement accuracy, and provide a scientific basis for optimizing the thermocouple arrangement and liquid level control, thereby improving the performance of the temperature monitoring system in nuclear power plants or other high-temperature environments. This method of comprehensively considering multiple variables helps to improve the application value and technical depth of the experimental results.

[0131] The experimental method of the reactor core outlet thermocouple temperature deviation experimental device provided by the present application is further described below with reference to a specific example.

[0132] Reference Figure 8 As shown, the main steps of this example experimental method include:

[0133] S801. Install the core outlet thermocouple temperature deviation experimental device.

[0134] Place the positioning component 202 on the fixture 106 in the thermostatic box 1, and add water of an appropriate height into the thermostatic box 1; connect the four thermocouples in the temperature acquisition system 2 to the temperature collector 209 through the port, and the temperature collector 209 is connected to the computer through the RS485 communication line. Open the experimental software on the computer, set the relevant software parameters, so that the experimental software can receive the temperature of each thermocouple in real time and store it. In addition, connect the entire reactor core outlet thermocouple temperature deviation experimental device to the power supply.

[0135] S802. Calibrate thermocouple error.

[0136] Place four thermocouples at the same point in the same atmospheric environment and at the same point in water at 60°C, 70°C, 80°C and 90°C in a constant temperature box 1, and record the corresponding temperature data. Each thermocouple has five temperature data. The experimental data measured by each thermocouple are plotted into a corresponding fitting curve, and one of the curves is selected as the standard curve. The temperature deviation of this standard curve and the other three curves is the smallest, which is used to calibrate the error of each thermocouple.

[0137] S803, experimental preprocessing.

[0138] Each thermocouple is installed in the initial position, which includes: the first thermocouple 201 is placed in the water in the constant temperature box 1, the second thermocouple 203 passes through the guide tube 205 and the end plug 206 to the fully extended first position P1, the third thermocouple 207 is placed in the dead water between the support tube 204 and the guide tube 205, and the fourth thermocouple 208 is placed in the atmospheric environment outside the constant temperature box 1; and each thermocouple can be fixed by a plastic pipe rack (not shown in the figure).

[0139] S804 , changing the position of the second thermocouple 203 .

[0140] like Figure 5 As shown, the second thermocouple 203 can be adjusted to four preset positions, including the first position P1 fully extended, the second position P2 half extended, the third position P3 not extended but at the bottom of the internal channel of the end plug 206, and the fourth position P4 not extended but at the upper part of the internal channel of the end plug 206, and the internal channel of the end plug 206 is used to clamp the second thermocouple 203. And the heating rod 103 is controlled to heat the water temperature to 60°C, 70°C, 80°C, and 90°C, and the mixer is constantly running. At this time, the liquid level of the thermostat 1 is flush with the support tube 204, and the temperature of each thermocouple is collected when the device reaches a steady state.

[0141] S805. Record experimental data.

[0142] The experimental data are stored via the temperature collector 209 and the computer.

[0143] S806, changing the hot water level in the thermostat 1.

[0144] The hot water level in the thermostatic box 1 is adjusted to be flush with the support tube 204, three quarters, one half and one quarter of the height of the support tube 204, and then steps S803 and S804 are repeated.

[0145] S807. Process experimental data.

[0146] Repeat steps S803 to S806 three times, analyze and process the stored experimental data through computer experimental software, put the temperatures of the four thermocouples in each experiment at four different positions and different liquid level conditions when they reach a steady state into the same table, calculate and analyze the temperature deviation between the second thermocouple 203 and the first thermocouple 201, and establish a functional relationship between the temperature deviation and the installation position and the liquid level. Based on the analysis results, a conclusion is drawn on how to select the best installation position and liquid level to minimize the temperature deviation.

[0147] Therefore, the present application can provide a large amount of reusable data to analyze the correlation between the temperature deviation of the thermocouple and the installation position and the height of the hot and cold turbulent liquid level, thereby meeting the needs of accurate measurement of the thermocouple temperature in the reactor core of a nuclear power plant and helping to improve the safety of nuclear power plant operation.

[0148] The above are only preferred embodiments of the present application and are not intended to limit the embodiments of the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the embodiments of the present application should be included in the protection scope of the embodiments of the present application.

Claims

1. A reactor core outlet thermocouple temperature deviation experimental device, characterized in that: include: A thermostatic box, wherein a hot flow medium and a stirrer for stirring the hot flow medium are arranged inside the thermostatic box, and a cold flow medium for exchanging heat with the hot flow medium is arranged outside the thermostatic box; The temperature acquisition system includes a first thermocouple, a positioning assembly and a second thermocouple, wherein the first thermocouple is arranged in the heat flow medium, the positioning assembly is arranged in the constant temperature box, the second thermocouple is arranged in the positioning assembly, and the second thermocouple can extend or retract the positioning assembly.

2. The reactor core outlet thermocouple temperature deviation experimental device according to claim 1, characterized in that: Also includes: A liquid level control system is connected to the thermostat and is used to adjust the liquid level of the heat flow medium in the thermostat.

3. The reactor core outlet thermocouple temperature deviation experimental device according to claim 1, characterized in that: The thermostat comprises: A box body, wherein the hot flow medium, the stirrer and the positioning assembly are arranged inside the box body, and the cold flow medium is arranged outside the box body; A heating rod is arranged in the box; A temperature sensor is disposed in the box; A temperature controller is electrically connected to the heating rod and the temperature sensor respectively, and is used to control the temperature of the heat flow medium.

4. The reactor core outlet thermocouple temperature deviation experimental device according to claim 3, characterized in that: The thermostat also includes: The clamp is arranged at the bottom of the box body and is used to fix the positioning assembly.

5. The reactor core outlet thermocouple temperature deviation experimental device according to claim 4, characterized in that: The positioning component comprises: A support cylinder, arranged corresponding to the clamp; A guide tube is arranged in the support tube, and one end of the guide tube away from the clamp is detachably connected to the support tube. An end plug is provided at one end of the guide tube adjacent to the clamp, and the end plug is detachably connected to one end of the support tube adjacent to the clamp, and the end plug is fixed on the clamp; the second thermocouple is used to be clamped in the end plug through the guide tube, and the second thermocouple can extend or retract the end plug.

6. The reactor core outlet thermocouple temperature deviation experimental device according to claim 5, characterized in that: The temperature acquisition system also includes: The third thermocouple is arranged between the support tube and the guide tube.

7. The reactor core outlet thermocouple temperature deviation experimental device according to claim 6, characterized in that: The temperature acquisition system also includes: The fourth thermocouple is arranged outside the box and is used to collect the temperature of the cold flow medium.

8. The reactor core outlet thermocouple temperature deviation experimental device according to claim 7, characterized in that: The temperature acquisition system also includes: a temperature collector, electrically connected to the first thermocouple, the second thermocouple, the third thermocouple and the fourth thermocouple respectively; The terminal is electrically connected to the temperature collector.

9. An experimental method for a reactor core outlet thermocouple temperature deviation experimental device according to any one of claims 1 to 8, characterized in that: include: Adjusting the installation position of the second thermocouple to a set position, and controlling the mixer to operate constantly, wherein there are a plurality of set positions; Collecting the measured temperature of the first thermocouple and the measured temperature of the second thermocouple at each of the set positions to obtain the temperature deviation of the second thermocouple at each of the set positions; Determining the correlation between the temperature deviation of the second thermocouple and the installation position of the second thermocouple according to the temperature deviation of the second thermocouple at each of the set positions; The temperature deviation is the difference between the measured temperatures of the second thermocouple and the first thermocouple.

10. The experimental method of the reactor core outlet thermocouple temperature deviation experimental device according to claim 9, characterized in that: Also includes: Adjusting the liquid level of the heat flux medium in the thermostat to a set height, wherein the set height has multiple values; Adjusting the installation position of the second thermocouple to each of the set positions at each of the set heights, and controlling the mixer to operate constantly; Collecting the measured temperature of the first thermocouple and the measured temperature of the second thermocouple at each of the set positions at each of the set heights, and obtaining the temperature deviation of the second thermocouple at each of the set positions at each of the set heights; According to the temperature deviation of the second thermocouple at each of the set positions at each of the set heights, the correlation between the temperature deviation of the second thermocouple and the installation position of the second thermocouple and the liquid level of the heat flow medium is determined.

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