Experimental measurement method and device for near-wall equivalent heat conductivity coefficient of high-temperature gas cooled reactor

Abstract

The invention provides an experimental measurement method and device for an equivalent heat conductivity coefficient of a near wall surface of a high-temperature gas cooled reactor, and relates to the technical field of nuclear engineering experiments, a pebble bed reactor core corresponding to the near wall surface of the high-temperature gas cooled reactor is a graphite pebble bed formed by stacking a plurality of graphite pebbles, and the graphite pebble bed is arranged in a rectangular heat insulation closed container; a temperature thermocouple is arranged in the center of a graphite ball in the length direction of the graphite ball bed, a power supply is connected to two ends of a heating copper plate, the heating copper plate is tightly attached to a graphite plate, the graphite plate is tightly attached to the inlet end of the graphite ball bed in the rectangular heat insulation closed container, and the graphite plate is arranged at the tail of the graphite ball bed and tightly attached to a water cooling box. The method comprises the following steps: acquiring steady-state temperature distribution in the length direction in the graphite pebble bed based on readings of a temperature thermocouple, and acquiring water temperatures of an inlet and an outlet of a water cooling box, so that equivalent heat conductivity coefficients of a graphite pebble bed main body and a near-wall area are calculated, and rapid and accurate measurement of the near-wall equivalent heat conductivity coefficient of the high-temperature gas cooled reactor is realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of nuclear engineering experiments, and particularly relates to a method for experimentally measuring the equivalent thermal conductivity of a high-temperature gas-cooled reactor near a wall surface. BACKGROUND

[0002] The heat transfer characteristics of a high-temperature gas-cooled reactor, particularly the equivalent thermal conductivity, are crucial to the thermal management and safe operation of the reactor. In the related art, the variation characteristics of the equivalent thermal conductivity near the wall surface of the reactor core have not been focused on. Since the equivalent thermal conductivity near the wall surface of the high-temperature gas-cooled reactor is indeed different from that of the main body of the reactor core, it directly affects the cooling efficiency of the reactor core, and therefore, there is an urgent need for a method for experimentally measuring the equivalent thermal conductivity near the wall surface of the high-temperature gas-cooled reactor. SUMMARY

[0003] The present application aims to at least partially solve one of the technical problems in the related art.

[0004] To this end, the first object of the present application is to provide a method for experimentally measuring the equivalent thermal conductivity near the wall surface of a high-temperature gas-cooled reactor. The steady-state temperature distribution in the length direction of the graphite ball bed is obtained based on the readings of the temperature measuring thermocouples, and the water temperatures at the inlet and outlet of the water cooling tank are obtained, so as to calculate the equivalent thermal conductivity of the main body and the near-wall surface region of the graphite ball bed, thereby achieving rapid and accurate measurement of the equivalent thermal conductivity near the wall surface of the high-temperature gas-cooled reactor.

[0005] The second object of the present application is to provide a device for experimentally measuring the equivalent thermal conductivity near the wall surface of a high-temperature gas-cooled reactor.

[0006] The third object of the present application is to provide an electronic device.

[0007] The fourth object of the present application is to provide a non-transitory computer-readable storage medium storing computer instructions.

[0008] To achieve the above object, the first aspect of the present application provides an experimental measurement method of the equivalent thermal conductivity of the near-wall surface of a high-temperature gas-cooled reactor, which uses an experimental device including a graphite sphere bed, a rectangular adiabatic sealed container, a heated copper plate, a graphite plate, a power supply, and a water-cooled tank. In the case that the heated copper plate is heated by controlling the power of the power supply, the heat of the heated copper plate is transferred to the graphite sphere bed area in the rectangular adiabatic sealed container through the graphite plate, the heat of the graphite sphere bed area is continuously transferred to the graphite plate at the tail in the length direction, and the heat is taken away by the cooling water circulation of the water-cooled tank, and when the readings of all the temperature measuring thermocouples obtained are less than the set fluctuation deviation, the steady-state temperature distribution in the length direction of the graphite sphere bed is obtained based on the readings of all the temperature measuring thermocouples, and the water temperature at the inlet and outlet of the water-cooled tank is obtained, wherein the length direction is the heat transfer direction of the graphite sphere bed. According to the steady-state temperature distribution and the water temperature at the inlet and outlet of the water-cooled tank, the equivalent thermal conductivity of the graphite sphere bed is calculated as the equivalent thermal conductivity of the corresponding sphere bed core of the near-wall surface of the high-temperature gas-cooled reactor.

[0009] To achieve the above object, the second aspect of the present application provides an experimental measurement device of the equivalent thermal conductivity of the near-wall surface of a high-temperature gas-cooled reactor, which performs the experimental measurement method of the equivalent thermal conductivity of the near-wall surface of a high-temperature gas-cooled reactor, and the device includes: The acquisition module is configured to, in the case that the heated copper plate is heated by controlling the power of the power supply, the heat of the heated copper plate is transferred to the graphite sphere bed area in the rectangular adiabatic sealed container through the graphite plate, the heat of the graphite sphere bed area is continuously transferred to the graphite plate at the tail in the length direction, and the heat is taken away by the cooling water circulation of the water-cooled tank, and when the readings of all the temperature measuring thermocouples obtained are less than the set fluctuation deviation, obtain the steady-state temperature distribution in the length direction of the graphite sphere bed based on the readings of all the temperature measuring thermocouples, and obtain the water temperature at the inlet and outlet of the water-cooled tank, wherein the length direction is the heat transfer direction of the graphite sphere bed. The calculation module is configured to calculate the equivalent thermal conductivity of the graphite sphere bed according to the steady-state temperature distribution and the water temperature at the inlet and outlet of the water-cooled tank, and take the equivalent thermal conductivity as the equivalent thermal conductivity of the corresponding sphere bed core of the near-wall surface of the high-temperature gas-cooled reactor.

[0010] To achieve the above object, the third aspect of the present application provides an electronic device, comprising: at least one processor; and a memory connected with the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to execute the method of the first aspect.

[0011] To achieve the above object, the fourth aspect of the present application provides a non-transitory computer readable storage medium storing computer instructions, and the computer instructions are used to make the computer execute the method of the first aspect.

[0012] The experimental measurement method and device for the equivalent thermal conductivity of the near-wall surface of the high-temperature gas cooled reactor, the electronic device and the storage medium provided by the embodiments of the present application, the equivalent replacement of the corresponding pebble bed core of the high-temperature gas cooled reactor is a graphite pebble bed formed by a plurality of graphite pebbles, the graphite pebble bed is placed in a rectangular adiabatic closed container, a temperature measuring thermocouple is arranged at the center of the graphite pebble along the length direction of the graphite pebble bed, a power supply is connected to both ends of a heating copper plate, the heating copper plate is closely attached to a graphite plate, the graphite plate is closely attached to the inlet end of the graphite pebble bed in the rectangular adiabatic closed container, and a graphite plate is arranged at the tail of the graphite pebble bed and closely attached to a water cooling tank, and the water cooling tank passes through cooling water at a constant mass flow rate. The method comprises the following steps: based on the readings of the temperature measuring thermocouples, the steady-state temperature distribution in the length direction of the graphite pebble bed is obtained, and the water temperature at the inlet and outlet of the water cooling tank is obtained at the same time, so that the equivalent thermal conductivity of the main body of the graphite pebble bed and the near-wall surface region is calculated, and the rapid and accurate measurement of the equivalent thermal conductivity of the near-wall surface of the high-temperature gas cooled reactor is realized.

[0013] Additional aspects and advantages of the present application will be made apparent by the following description and the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0014] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the following description, taken in conjunction with the accompanying drawings, in which: Figure 1 A flowchart of an experimental measurement method for the equivalent thermal conductivity of the near-wall surface of the high-temperature gas cooled reactor provided by the embodiments of the present application is shown in the figure; Figure 2 A principle diagram of the division of the near-wall surface characteristic region of the corresponding pebble bed core of the high-temperature gas cooled reactor provided by the embodiments of the present application is shown in the figure; Figure 3 An example diagram of the verification result of the pebble bed porosity from the main body region of the core to the near-wall surface region of the core provided by the embodiments of the present application is shown in the figure; Figure 4 An example diagram of an experimental device provided by the embodiments of the present application is shown in the figure; Figure 5 A single graphite ball temperature measuring thermocouple installation schematic diagram provided by an embodiment of the present application; Figure 6 A sleeve sealing structure diagram provided by an embodiment of the present application; Figure 7 A structure schematic diagram of an experimental measurement device for the equivalent thermal conductivity of a near-wall surface of a high-temperature gas cooled reactor provided by an embodiment of the present application. DETAILED DESCRIPTION

[0015] Embodiments of the present application are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0016] It should be noted that the acquisition, storage, use, processing, etc. of data in the technical solutions of the present application comply with the relevant provisions of relevant laws and regulations.

[0017] The experimental measurement method, device, electronic equipment and storage medium for the equivalent thermal conductivity of a near-wall surface of a high-temperature gas cooled reactor of an embodiment of the present application are described below with reference to the accompanying drawings.

[0018] Figure 1 A flowchart of an experimental measurement method for the equivalent thermal conductivity of a near-wall surface of a high-temperature gas cooled reactor provided by an embodiment of the present application.

[0019] It should be noted that for a high-temperature gas cooled reactor cylindrical pebble bed, the ratio of the diameter of the cylindrical pebble bed to the diameter of the fuel ball is very large, and the heat transfer process from the radial direction to the wall surface (including the main core region and the near-wall core region of the high-temperature gas cooled reactor) can be simplified in the manner as shown in Figure 2 , that is, the local packing structure in the near-wall core region is extracted as a near-wall core characteristic region. Since the near-wall core characteristic region is extremely small relative to the size of the entire high-temperature gas cooled reactor cylindrical pebble bed, a graphite pebble bed model formed by multiple graphite balls in a rectangular region can be used to replace it. Figure 2 A division principle schematic diagram of a near-wall core characteristic region of a high-temperature gas cooled reactor provided in an embodiment of the present application.

[0020] In the experimental method involved in the present application, the model of the graphite pebble bed in the near-wall core characteristic region designed by the present application can effectively represent the thermophysical properties of the corresponding near-wall core characteristic region of the real high-temperature gas cooled reactor cylindrical pebble bed, and the technical basis is as follows: The porosity of the pebble bed is a key parameter describing the packing density of cylindrical pebble beds in a high-temperature gas-cooled reactor (HTGR), significantly influencing heat transfer and gas flow. This invention achieves a reasonable physical equivalence to the real-world situation by precisely controlling the packing process and boundary constraints, ensuring that the porosity distribution of the graphite pebble bed matches the distribution in the near-wall region of the core in a real HTGR cylindrical pebble bed. This verification can be validated using mathematical models describing the pore structure of porous materials (e.g., the DeKlerk porosity model). Specifically, the DeKlerk porosity model, serving as the validation benchmark, accurately reflects the porosity distribution from the core bulk region to the near-wall region. The DeKlerk porosity model (e.g., the DeKlerk correlation) describes the porosity distribution of the cylindrical pebble bed in an HTGR using a piecewise combination of parabolic and cosine functions. :

[0021] In the formula, This represents the dimensionless distance from the center of the cylindrical spherical bed of the high-temperature gas-cooled reactor. This represents the average porosity of the core bulk region.

[0022] As an example, Figure 3 This is an example diagram illustrating the verification results of the pebble bed porosity from the core body region to the near-wall region (location) of the core. It includes the experimentally measured porosity distribution curve of the cylindrical pebble bed in a high-temperature gas-cooled reactor, and the porosity distribution curve reflected by the DeKlerk porosity model. The experimentally measured porosity distribution of the cylindrical pebble bed in the high-temperature gas-cooled reactor matches well with the porosity distribution reflected by the DeKlerk porosity model, with an average deviation less than the set deviation threshold (e.g., 5%). This proves that the model of the graphite pebble bed in the near-wall region of the core of the present invention has good equivalence with the near-wall region of the cylindrical pebble bed in the core of a high-temperature gas-cooled reactor. Therefore, the heat transfer parameters (such as equivalent thermal conductivity) obtained based on the experimental device of the present invention can be used for the thermal analysis and design of the near-wall region of the cylindrical pebble bed core of a real high-temperature gas-cooled reactor.

[0023] In summary, the experimental setup used for measuring the near-wall equivalent thermal conductivity of a high-temperature gas-cooled reactor consists of a heating copper plate 1, a graphite plate 2, a graphite spherical bed 3, a rectangular insulated sealed container (insulation board) 4, a water-cooled box 5, and a power supply (DC heating power supply) 6. Figure 4 As shown, Figure 4An experimental device provided by the embodiment of the present application is shown in the figure, specifically, the equivalent replacement of the pebble bed core corresponding to the near-wall surface of the high temperature gas cooled reactor is a graphite pebble bed 3 formed by stacking multiple graphite pebbles, the graphite pebble bed 3 is placed in a rectangular adiabatic closed container 4 surrounded by heat insulation material, multiple temperature measuring planes are arranged at different height positions in the graphite pebble bed 3, multiple temperature measuring points are arranged on each temperature measuring plane along the length direction of the graphite pebble bed, each temperature measuring point is a temperature measuring thermocouple arranged at the center of the graphite pebble, the positive and negative poles of a power supply 6 are connected (connected through switches and protectors, circuit wires) to the two ends of a heating copper plate 1, the heating copper plate 1 is tightly attached to a graphite plate 2, the graphite plate 2 is tightly attached to the inlet end of the graphite pebble bed 3 in the rectangular adiabatic closed container 4, the tail end of the graphite pebble bed 3 is also provided with a graphite plate 2, and the graphite plate 2 at the tail end is tightly attached to a water cooling tank 5, and the water cooling tank 5 circulates cooling water at a constant mass flow rate.

[0024] As shown in Figure 1 , the method comprises the following steps: Step 101, in the case that the heating copper plate is heated by controlling the power of the power supply, the heat of the heating copper plate is transmitted to the graphite pebble bed area in the rectangular adiabatic closed container along the graphite plate, the heat of the graphite pebble bed area continues to be transmitted to the graphite plate at the tail end along the length direction, and the heat is taken away by the cooling water circulation of the water cooling tank, and when the readings of all the temperature measuring thermocouples are less than the set fluctuation deviation, the steady state temperature distribution in the length direction of the graphite pebble bed is obtained based on the readings of all the temperature measuring thermocouples, and the inlet and outlet water temperatures of the water cooling tank are obtained, wherein the length direction is the heat transfer direction of the graphite pebble bed.

[0025] Specifically, the disordered graphite pebble bed can be filled into a cuboid experimental section (rectangular adiabatic closed container) surrounded by heat insulation material, the positive and negative poles of a controllable silicon direct current power supply are connected to the two ends of a heating copper plate, and the heating copper plate is tightly attached to the graphite plate at the inlet end of the cuboid experimental section. When the graphite pebble bed is stacked, three temperature measuring planes are arranged at different height positions, and multiple temperature measuring points provided with temperature measuring thermocouples are arranged in the length direction, the spacing between each temperature measuring point is the same, and when the graphite pebbles are disorderedly filled, the corresponding temperature measuring graphite pebbles are drilled, and the temperature measuring thermocouples are inserted into the centers of the graphite pebbles. The controllable silicon direct current power supply will heat the copper plate based on the resistance effect to generate heat, the heat is transmitted to the graphite pebble bed area along the graphite plate, the heat of the graphite pebble bed area continues to be transmitted to the graphite plate at the tail end along the length direction, and finally the heat is taken away by the tightly attached stainless steel water tank (water cooling tank).

[0026] Step 102, according to the steady state temperature distribution and the inlet and outlet water temperatures of the water cooling tank, the equivalent thermal conductivity of the graphite pebble bed is calculated as the equivalent thermal conductivity of the pebble bed core corresponding to the near-wall surface of the high temperature gas cooled reactor.

[0027] In some possible embodiments, the equivalent thermal conductivity of the graphite sphere bed is calculated according to the steady-state temperature distribution and the water temperature at the inlet and outlet of the water-cooled box, and is taken as the equivalent thermal conductivity of the sphere bed core corresponding to the near-wall surface of the high-temperature gas-cooled reactor, including: based on the distribution of the temperature measuring points, the graphite sphere bed is divided into n units along the heat transfer direction, the readings of the temperature measuring thermocouples at each unit are taken as the steady-state temperature distribution, and the heat loss in the heat insulation material in each unit is calculated according to the readings of the temperature measuring thermocouples at each unit ; the heat carried away by the water-cooled box is calculated according to the water temperature at the inlet and outlet of the water-cooled box ; the heat flow at any position j along the heat transfer direction of the graphite sphere bed is calculated according to the heat loss in the heat insulation material in each unit and the heat carried away by the water-cooled box , ; based on , the area A perpendicular to the temperature gradient along the heat transfer direction, the equivalent thermal conductivity of the graphite sphere bed is calculated, which is taken as the equivalent thermal conductivity of the sphere bed core corresponding to the near-wall surface of the high-temperature gas-cooled reactor, wherein the temperature gradient is obtained by measuring the steady-state temperature distribution of the graphite sphere bed along the heat transfer direction.

[0028] wherein, , is the mass flow rate of the water passing through the water-cooled box , is the specific heat capacity of the water , and are the water temperatures at the inlet and outlet of the water-cooled box respectively, and can be measured by temperature measuring thermocouples.

[0029] wherein, , is the thickness of the heat insulation material (m), is the cross-sectional area of the heat insulation material , is the thermal conductivity of the heat insulation material , is the temperature at the boundary of the graphite sphere bed, which is taken as the reading of the temperature measuring thermocouple at each unit , is the ambient temperature at the outside of the heat insulation material .

[0030] The experimental measurement method of the high-temperature gas cooled reactor near-wall equivalent thermal conductivity coefficient of the embodiment of the application, the corresponding pebble bed reactor core of the high-temperature gas cooled reactor near-wall is a graphite pebble bed formed by a plurality of graphite pebbles, the graphite pebble bed is placed in a rectangular adiabatic closed container, the center of the graphite pebble along the length direction of the graphite pebble bed is provided with a temperature measuring thermocouple, a power supply is connected to both ends of a heating copper plate, the heating copper plate is closely attached to a graphite plate, the graphite plate is closely attached to the inlet end of the graphite pebble bed in the rectangular adiabatic closed container, and a graphite plate is arranged at the tail of the graphite pebble bed and closely attached to a water cooling tank, the water cooling tank passes through cooling water at a constant mass flow rate, and the method comprises the following steps: based on the reading of the temperature measuring thermocouple, the steady-state temperature distribution in the length direction of the graphite pebble bed is obtained, and the water temperature at the inlet and outlet of the water cooling tank is obtained at the same time, so that the equivalent thermal conductivity coefficient of the main body of the graphite pebble bed and the near-wall region is calculated, and the rapid and accurate measurement of the high-temperature gas cooled reactor near-wall equivalent thermal conductivity coefficient is realized.

[0031] In order to realize the above-mentioned embodiment, the application further provides a single graphite pebble temperature measuring thermocouple installation schematic diagram, as shown in Figure 5 , referring to Figure 4 , in the graphite pebble bed reactor core main body graphite pebble region, for the graphite pebble 8 of the temperature measuring point arranged at a certain interval, drilling is required, the drilling depth can be 30 mm, the temperature measuring thermocouple 9 is inserted into the center of the graphite pebble 8, and then the hole is sealed and the temperature measuring thermocouple is fixed by using the fireproof plugging material 10 (fireproof plugging mud), wherein the temperature measuring thermocouple 9 is inserted into the center of the graphite pebble 8 through the thermocouple guide pipe.

[0032] The application embodiment further provides a sleeve sealing structure diagram, as shown in Figure 6 , specifically, in the sleeve sealing structure diagram, the nut 12 is closely installed on the rectangular adiabatic closed container (heat preservation plate) 4, the temperature measuring thermocouple 9 is inserted into the center of the graphite pebble 8 through the thermocouple guide pipe 11, the ceramic rubber ring 14 is placed in the nut 12, the hole bolt 13 is matched with the threads of the nut 12, in the process of twisting the hole bolt 12, the ceramic rubber ring 14 is extruded and deformed, so as to be closely attached to the thermocouple guide pipe 11, and the purpose of insulation sealing is achieved. Wherein, the ceramic rubber ring 14 can be replaced by high-temperature resistant material.

[0033] Therefore, the specific implementation of the graphite pebble bed near-wall equivalent thermal conductivity coefficient measurement experiment is as follows: 1. The diameter 60 mm graphite pebble is randomly stacked in the rectangular adiabatic closed container, the position of the graphite pebble of the temperature measuring point is marked during the placement process, the graphite pebble which needs to be temperature measured is drilled and the temperature measuring thermocouple is placed, and then the fireproof plugging mud is used for plugging.

[0034] 2. The graphite pebbles at different positions of the temperature measuring point are marked, the temperature measuring thermocouple extension section is connected to the outside of the experimental cavity through the sealing sleeve, and is connected to the data acquisition system according to the mark, so as to collect the temperature measuring thermocouple reading.

[0035] 3. Repeat 1 to 2 steps to stack graphite balls of different temperature measuring planes until the chamber of the rectangular adiabatic closed container is filled, the heating copper plate is tightly attached to the graphite plate at the head and tail of the graphite ball bed, the chamber of the rectangular adiabatic closed container is closed, and the upper lead wire of the chamber of the rectangular adiabatic closed container is sealed by a sleeve.

[0036] 4. When the graphite ball bed heating experiment is performed, first, the total switch is opened, the heating copper plate is heated by controlling the power of the total power supply, and the water cooling tank at the tail is opened for cooling water circulation. In this process, the heat power of the heating copper plate is controlled to be constant. When the readings of all temperature measuring thermocouples are stable (the readings are less than the set fluctuation deviation), the steady-state temperature distribution in the length direction of the graphite ball bed and the water temperature at the inlet and outlet of the water cooling tank are recorded, so as to calculate the equivalent thermal conductivity, which is used as the equivalent thermal conductivity of the corresponding ball bed core of the high temperature gas cooled reactor near the wall surface.

[0037] Figure 7 A structural schematic diagram of an experimental measurement device for a high temperature gas cooled reactor near-wall surface equivalent thermal conductivity coefficient for performing an experimental measurement method of a high temperature gas cooled reactor near-wall surface equivalent thermal conductivity coefficient is provided for an embodiment of the present application.

[0038] As shown in Figure 7 , the experimental measurement device 70 for the high temperature gas cooled reactor near-wall surface equivalent thermal conductivity coefficient includes an acquisition module 71 and a calculation module 72.

[0039] The acquisition module 71 is configured to, in a case where the heating copper plate is heated by controlling the power of the power supply, the heat of the heating copper plate is transmitted to the graphite ball bed region in the rectangular adiabatic closed container along the graphite plate, the heat of the graphite ball bed region continues to be transmitted to the graphite plate at the tail along the length direction, and the heat is taken away by the cooling water circulation of the water cooling tank, and when the readings of all temperature measuring thermocouples obtained are less than a set fluctuation deviation, acquire the steady-state temperature distribution in the length direction of the graphite ball bed based on the readings of all temperature measuring thermocouples, and simultaneously acquire the water temperature at the inlet and outlet of the water cooling tank, wherein the length direction is the heat transfer direction of the graphite ball bed. The calculation module 72 is configured to calculate the equivalent thermal conductivity of the graphite ball bed according to the steady-state temperature distribution and the water temperature at the inlet and outlet of the water cooling tank, so as to be used as the equivalent thermal conductivity of the corresponding ball bed core of the high temperature gas cooled reactor near the wall surface.

[0040] Further, in a possible implementation manner of the embodiment of the present application, the calculation module 72 is specifically configured to: based on the distribution of the temperature measuring points, divide the graphite ball bed into n units along the heat transfer direction, take the readings of the temperature measuring thermocouples at each unit as the steady-state temperature distribution, and calculate the heat loss in the heat insulation material in each unit according to the readings of the temperature measuring thermocouples at each unit as . According to the water temperature at the inlet and outlet of the water cooled box, the heat taken away by the water cooled box is calculated ; According to the heat loss in the thermal insulation material in each unit and the heat taken away by the water cooled box , the heat flow at any position j along the heat transfer direction of the graphite sphere bed is calculated , ; Based on the , the area A perpendicular to the temperature gradient at position j along the heat transfer direction, the equivalent thermal conductivity of the graphite sphere bed is calculated as the equivalent thermal conductivity of the sphere bed core corresponding to the near-wall of the high-temperature gas cooled reactor The steady-state temperature distribution of the graphite sphere bed along the heat transfer direction is obtained by measurement.

[0041] Further, in a possible implementation manner of the embodiment of the present application, wherein, , is the mass flow rate of the water through the water cooled box, is the specific heat capacity of the water, and are the water temperatures at the inlet and outlet of the water cooled box respectively.

[0042] Further, in a possible implementation manner of the embodiment of the present application, wherein, , is the thickness of the thermal insulation material, is the cross-sectional area of the thermal insulation material, is the thermal conductivity of the thermal insulation material, is the temperature at the boundary of the graphite sphere bed, and the reading of the thermocouple at the measuring position is taken, is the ambient temperature at the outside of the thermal insulation material.

[0043] It should be noted that the foregoing explanation and description of the method embodiment are also applicable to the device of the embodiment, and will not be repeated here.

[0044] The experimental measurement device of the equivalent heat conductivity coefficient of the near-wall surface of the high-temperature gas cooled reactor in the embodiment of the application is characterized in that: the power of the power supply is controlled to heat the copper plate, the heat of the heated copper plate is transferred to the graphite ball bed area in the rectangular adiabatic closed container along the graphite plate, the heat of the graphite ball bed area continues to be transferred to the graphite plate at the tail along the length direction, and the heat is taken away by the water cooling tank through water circulation cooling; when the readings of all the temperature measuring thermocouples obtained are less than the set fluctuation deviation, the steady-state temperature distribution in the length direction of the graphite ball bed is obtained based on the readings of all the temperature measuring thermocouples, and the water temperature at the inlet and outlet of the water cooling tank is obtained; the length direction is the heat transfer direction of the graphite ball bed; the equivalent heat conductivity coefficient of the graphite ball bed is calculated according to the steady-state temperature distribution and the water temperature at the inlet and outlet of the water cooling tank, so as to serve as the equivalent heat conductivity coefficient of the near-wall surface of the high-temperature gas cooled reactor corresponding to the ball bed reactor core, and realize the rapid and accurate measurement of the equivalent heat conductivity coefficient of the near-wall surface of the high-temperature gas cooled reactor.

[0045] In order to achieve the above-mentioned embodiments, the present application further provides an electronic device, comprising: at least one processor; and a memory in communication connection with the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to execute the foregoing method.

[0046] In order to achieve the above-mentioned embodiments, the present application further provides a non-transitory computer readable storage medium storing computer instructions, and the computer instructions are used to enable the computer to execute the foregoing method.

[0047] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above-mentioned terms is not necessarily for the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any suitable manner in any one or more embodiments or examples. In addition, the skilled in the art can combine and combine the different embodiments or examples described in the present application and the features of the different embodiments or examples without contradiction.

[0048] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0049] Any process or method description in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more executable instructions for implementing custom logic functions or processes, and the scope of preferred embodiments of the invention includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the functions involved, as should be understood by those skilled in the art to which embodiments of the invention pertain.

[0050] 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). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include: an electrical connection having one or more wires (electronic device), a portable computer disk drive (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Alternatively, the computer-readable medium may be paper or other suitable media on which the program can be printed, since the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in a computer memory.

[0051] It should be understood that each part of the present application can be realized by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, a plurality of steps or methods can be realized by software or firmware stored in a memory and executed by a suitable instruction execution system. As in another embodiment, if realized by hardware, any one or a combination of the following technologies known in the art can be used: discrete logic circuit with logic gate circuit for implementing logic function on data signal, application specific integrated circuit with suitable combination logic gate circuit, programmable gate array (PGA), field programmable gate array (FPGA) and the like.

[0052] Those skilled in the art of the present technology can understand that all or part of the steps carried out by the above-mentioned embodiment method can be completed by a program instructing the relevant hardware, and the program can be stored in a computer readable storage medium. When the program is executed, it includes one of the steps of the method embodiment or a combination thereof.

[0053] In addition, each functional unit in each embodiment of the present application can be integrated in one processing module, or each unit can exist physically alone, or two or more units can be integrated in one module. The above-mentioned integrated module can be realized in the form of hardware or in the form of software functional module. When the integrated module is realized in the form of software functional module and sold or used as an independent product, it can also be stored in a computer readable storage medium.

[0054] The above-mentioned storage medium can be a read-only memory, a magnetic disk or an optical disk, etc. Although the embodiments of the present application have been shown and described above, it should be understood that the above-mentioned embodiments are exemplary and cannot be understood as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above-mentioned embodiments within the scope of the present application.

Claims

1. An experimental method for measuring the near-wall equivalent thermal conductivity of a high-temperature gas-cooled reactor, characterized in that, The experimental apparatus used for measuring the equivalent thermal conductivity near the wall of a high-temperature gas-cooled reactor includes a graphite sphere bed, a rectangular insulated sealed container, a heating copper plate, a graphite plate, a power supply, and a water-cooled box. The sphere bed core corresponding to the near-wall surface of the high-temperature gas-cooled reactor is equivalently replaced by a graphite sphere bed composed of multiple stacked graphite spheres. The graphite sphere bed is placed within a rectangular insulated sealed container surrounded by insulating material. Multiple temperature measuring planes are arranged at different heights within the graphite sphere bed. Multiple temperature measuring points are arranged along the length of the graphite sphere bed on each temperature measuring plane. Each temperature measuring point is a thermocouple placed at the center of a graphite sphere. The positive and negative terminals of the power supply are connected to both ends of the heating copper plate, which is in close contact with the graphite plate. The graphite plate is in close contact with the inlet end of the graphite sphere bed within the rectangular insulated sealed container. A graphite plate is also arranged at the tail end of the graphite sphere bed, and this tail end is in close contact with the water-cooled box. Cooling water flows through the water-cooled box at a constant mass flow rate. The method includes: The heating copper plate is heated by controlling the power supply. The heat from the heated copper plate is transferred along the graphite plate to the graphite ball bed area in the rectangular insulated sealed container. The heat from the graphite ball bed area continues to be transferred along the length direction to the graphite plate at the tail end. Then, the heat is removed by the cooling water circulation in the water-cooling box. When the readings of all the temperature measuring thermocouples are less than the set fluctuation deviation, the steady-state temperature distribution along the length direction in the graphite ball bed is obtained based on the readings of all the temperature measuring thermocouples. At the same time, the inlet and outlet water temperatures of the water-cooling box are obtained. The length direction is the heat transfer direction of the graphite ball bed. Based on the steady-state temperature distribution and the inlet and outlet water temperatures of the water-cooled box, the equivalent thermal conductivity of the graphite sphere bed is calculated and used as the equivalent thermal conductivity of the sphere bed core corresponding to the near-wall surface of the high-temperature gas-cooled reactor.

2. The experimental measurement method for the near-wall equivalent thermal conductivity of a high-temperature gas-cooled reactor according to claim 1, characterized in that, The step of calculating the equivalent thermal conductivity of the graphite spherical bed based on the steady-state temperature distribution and the inlet and outlet water temperatures of the water-cooled box, and using this as the equivalent thermal conductivity of the spherical bed core corresponding to the near-wall surface of the high-temperature gas-cooled reactor, includes: Based on the distribution of temperature measuring points, the graphite sphere bed is divided into n units along the heat transfer direction. The readings of the thermocouples at each unit are used as the steady-state temperature distribution. The heat loss in the insulation material within each unit is calculated based on the thermocouple readings. ; Calculate the heat removed by the water-cooled box based on the inlet and outlet water temperatures. ; Based on the heat loss in the insulation material within each unit Heat removed by the water-cooled box Calculate the heat flow at any position j along the heat transfer direction of the graphite sphere bed. , ; based on Perpendicular to the temperature gradient The equivalent thermal conductivity of the graphite sphere bed is calculated based on the area A along the heat transfer direction. , to be used as the equivalent thermal conductivity of the pebble bed core corresponding to the near-wall surface of the high-temperature gas-cooled reactor, where the temperature gradient The temperature distribution was obtained by measuring the steady-state temperature distribution of the graphite sphere bed along the heat transfer direction.

3. The experimental measurement method for the near-wall equivalent thermal conductivity of a high-temperature gas-cooled reactor according to claim 2, characterized in that, in, , It is measured by the mass flow rate of the water in the water-cooled tank. It is the specific heat capacity of water. and These are the water temperatures at the inlet and outlet of the water-cooled box, respectively.

4. The experimental measurement method for the near-wall equivalent thermal conductivity of a high-temperature gas-cooled reactor according to claim 2, characterized in that, in, , For the thickness of the insulation material, The cross-sectional area of ​​the insulation material. The thermal conductivity of the insulation material is... The temperature at the boundary of the graphite sphere bed is determined by taking the readings of the thermocouples at each unit. This corresponds to the ambient temperature outside the insulation material.

5. An experimental measuring apparatus for the near-wall equivalent thermal conductivity of a high-temperature gas-cooled reactor, used for performing the experimental measurement method for the near-wall equivalent thermal conductivity of a high-temperature gas-cooled reactor as described in claim 1, characterized in that, The device includes: The acquisition module is used to obtain the steady-state temperature distribution along the length direction of the graphite ball bed in a rectangular insulated sealed container when the heating copper plate is heated by the power of the control power supply, the heat from the heated copper plate is transferred along the graphite plate to the graphite ball bed area in the rectangular insulated sealed container, the heat from the graphite ball bed area is transferred along the length direction to the graphite plate at the tail, and the heat is removed by the cooling water circulation of the water cooling box. The module also obtains the inlet and outlet water temperatures of the water cooling box, where the length direction is the heat transfer direction of the graphite ball bed. The calculation module is used to calculate the equivalent thermal conductivity of the graphite sphere bed based on the steady-state temperature distribution and the inlet and outlet water temperatures of the water-cooled box, so as to serve as the equivalent thermal conductivity of the sphere bed core corresponding to the near-wall surface of the high-temperature gas-cooled reactor.

6. The experimental measuring device for the near-wall equivalent thermal conductivity of a high-temperature gas-cooled reactor according to claim 5, characterized in that, The computing module is specifically used for: Based on the distribution of temperature measuring points, the graphite sphere bed is divided into n units along the heat transfer direction. The readings of the thermocouples at each unit are used as the steady-state temperature distribution. The heat loss in the insulation material within each unit is calculated based on the thermocouple readings. ; Calculate the heat removed by the water-cooled box based on the inlet and outlet water temperatures. ; Based on the heat loss in the insulation material within each unit Heat removed by the water-cooled box Calculate the heat flow at any position j along the heat transfer direction of the graphite sphere bed. , ; based on Perpendicular to the temperature gradient The equivalent thermal conductivity of the graphite sphere bed is calculated based on the area A along the heat transfer direction. , to be used as the equivalent thermal conductivity of the pebble bed core corresponding to the near-wall surface of the high-temperature gas-cooled reactor, where the temperature gradient The temperature distribution was obtained by measuring the steady-state temperature distribution of the graphite sphere bed along the heat transfer direction.

7. The experimental measuring device for the near-wall equivalent thermal conductivity of a high-temperature gas-cooled reactor according to claim 6, characterized in that, in, , It is measured by the mass flow rate of the water in the water-cooled tank. It is the specific heat capacity of water. and These are the water temperatures at the inlet and outlet of the water-cooled box, respectively.

8. The experimental measuring device for the near-wall equivalent thermal conductivity of a high-temperature gas-cooled reactor according to claim 6, characterized in that, in, , For the thickness of the insulation material, The cross-sectional area of ​​the insulation material. The thermal conductivity of the insulation material is... The temperature at the boundary of the graphite sphere bed is determined by taking the readings of the thermocouples at each unit. This corresponds to the ambient temperature outside the insulation material.

9. An electronic device, characterized in that, include: At least one processor; as well as A memory communicatively connected to the at least one processor; wherein, The memory stores instructions that can be executed by the at least one processor to enable the at least one processor to perform the method of any one of claims 1-4.

10. A non-transitory computer-readable storage medium storing computer instructions, characterized in that, The computer instructions are used to cause the computer to perform the method according to any one of claims 1-4.

Images