Automatic mobile heat release rate measuring device
By using an automated mobile heat release rate measurement device, which combines staggered test bridges and calibration bridges with thermocouples, the problem of continuous measurement of the heat release rate of materials in reactor ducts was solved, enabling accurate heat release rate data acquisition and heat release distribution analysis under complex loading conditions.
Patent Information
- Application Number
- CN202511514396.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-22
- Publication Date
- 2026-02-27
AI Technical Summary
In existing technologies, it is difficult to continuously measure the heat release rate of materials within reactor channels. Fixed-point measurement methods cannot accurately capture the nonlinear distribution law of the heat release rate of materials, affecting the scientificity and rationality of fuel and material irradiation performance analysis.
Design an automated mobile heat release rate measurement device, including a support cylinder assembly and a calorimeter. Employ staggered test bridges and calibration bridges, combined with thermocouples for temperature data acquisition, and construct a stable thermal environment using inert gas to achieve axial movement and positioning of the device, eliminating interference from non-sample factors and providing accurate heat release rate data.
It enables continuous measurement of the heat release rate of materials within reactor pores, improves the accuracy of heat release rate measurement and computational capabilities under complex loading conditions, and ensures the reliability and accuracy of heat release distribution analysis.
Smart Images
Figure CN121583590A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of neutron irradiation test, in particular to an automatic mobile heat release rate measuring device. BACKGROUND
[0002] The material heat release rate is a key parameter in the irradiation process of fuel and materials, which is not only an important part of the heat source in the reactor, but also directly related to the actual thermal power of fuel elements, irradiation test samples and other nuclear facilities, and further affects the thermal safety and stability of these facilities and the accuracy of the irradiation test results. In the field of fuel and material irradiation test, with the continuous enrichment of in-core structural materials and the continuous increase of irradiation tasks, the proportion of material heat release in the total heat in the reactor gradually increases. Accurate acquisition of material heat release rate is an important basis for preliminary determination of material irradiation temperature and evaluation of fuel irradiation power, and plays an irreplaceable role in ensuring the reliability and safety of irradiation test.
[0003] At present, for the measurement of material heat release rate, the industry mainly relies on specific measuring devices, and mostly uses calorimetric methods to carry out related research. Common calorimetric measurement methods include sample adiabatic heating method when loaded into the active zone, step adiabatic heating method, static isothermal method, experimental measurement of heat transfer coefficient method, etc. In practical application, these methods basically adopt the mode of fixed-point measurement in the reactor, that is, the heat release rate detector or calorimeter is fixedly placed at a specific position on the axial direction of the hole, and the heat release rate data of the corresponding point is obtained through online monitoring at this position. However, this fixed-point measurement method has obvious limitations in obtaining continuous heat release rate information in the hole, and the amount of data that can be collected is limited, which makes it difficult to fully reflect the heat release distribution in the hole. Due to the complex structure of the reactor core load, the material heat release rate often shows nonlinear distribution characteristics on the axial direction of the hole, or although there is a certain regularity, the numerical difference at different heights on the axial direction is significant. Only relying on discrete data obtained by fixed-point measurement, the continuous change rule of material heat release rate cannot be accurately captured, and it is difficult to meet the demand for accurate calculation and evaluation of material heat release rate under complex loading conditions, which may affect the scientificity and rationality of subsequent analysis of the irradiation performance of fuel and materials. SUMMARY
[0004] The purpose of the present application is to provide an automatic mobile heat release rate measuring device, which solves the problems of difficult continuous measurement of material heat release rate in the reactor hole and calculation under complex loading.
[0005] The application realizes the technical scheme as follows: an automatic mobile heat release rate measuring device, comprising a support cylinder assembly, the support cylinder assembly comprises a protection tube, a calorimeter for measuring the heat release rate of a sample is arranged in the protection tube, a test bridge and a calibration bridge are respectively arranged in the calorimeter, one end of the test bridge is fixed to the end of the calorimeter, the other end of the test bridge is suspended and is provided with a sample, one end of the calibration bridge is fixed to the end of the calorimeter, the other end of the calibration bridge is suspended, a plurality of thermocouples are respectively arranged on the test bridge and the calibration bridge in the axial direction, one end of the protection tube is sealingly connected with a mouse dragon flange, a positioning flange for connecting a reactor is abutted with the mouse dragon flange and is sleeved on the protection tube in a sliding mode, the mouse dragon flange is sealingly provided with an air inlet pipe and an air outlet pipe which are in communication with the inside of the calorimeter.
[0006] Further, two calorimeters are arranged in the axial direction of the protection tube, the two calorimeters are arranged in a circumferential staggered mode and are fixed relative to each other.
[0007] Further, in one of the calorimeters, the suspended ends of the test bridge and the calibration bridge are both provided with mounting cylinders, a heating rod is connected to the mounting cylinders through a sleeve, and the sample is arranged between the mounting cylinder and the sleeve of the test bridge.
[0008] Further, the calorimeter is connected with a sealing assembly through a connecting pipe, the sealing assembly comprises an adapter and a heating wire sealing head, a thermocouple sealing head and an air pipe joint which are respectively connected with the adapter, the air pipe joint is in communication with the air inlet pipe and the air outlet pipe, the air inlet pipe and the air outlet pipe are both arranged in the connecting pipe, the heating wire sealing head is connected with the heating rod through a heating wire, the thermocouple sealing head is connected with the thermocouple, and the heating wire and the thermocouple are both arranged in the air outlet pipe.
[0009] Further, a plurality of fixing holes for fixing the thermocouples are arranged on the outer periphery of the test bridge and the calibration bridge.
[0010] Further, the calorimeter comprises a tube body and a top cover and a bottom cover which are respectively arranged at two ends of the tube body, the top cover is provided with a first connecting hole for sealingly penetrating the air inlet pipe and the air outlet pipe, and the inner end face of the bottom cover is provided with a second connecting hole for inserting the test bridge and the calibration bridge.
[0011] Further, the outlet of the air inlet pipe is close to the bottom cover.
[0012] Further, the other end of the protection tube is connected with a guide pipe, a filter cartridge is arranged between the guide pipe and the protection tube, and the guide pipe is insertedly connected with a lower joint.
[0013] Further, a water inlet hole is arranged on the side wall of the protection tube, and a water outlet hole is arranged at the end of the guide pipe.
[0014] Further, the test bridge and the calibration bridge are both in the form of a rod structure made of aluminum alloy.
[0015] The present application has at least the following advantages and beneficial effects: the support cylinder assembly provides structural support for the overall device, and the protection tube can protect the internal calorimeter to adapt to the complex environment of the reactor; the design of the test bridge loaded with samples and the calibration bridge without samples can exclude non-sample interference by comparing the temperatures of the two bridges, thereby improving the accuracy of the heat release rate measurement; the thermocouple installed along the axial direction can collect temperature data in real time, providing a basis for heat release rate calculation; the abutting connection of the mouse dragon flange and the positioning flange not only realizes stable connection of the device and the reactor, but also provides a structural basis for the axial movement of the calorimeter; the inlet pipe and the outlet pipe are in communication with the internal calorimeter, and inert gas (such as helium and argon) can be introduced to build a stable thermal environment, and the sealed design can prevent the intrusion of in-reactor medium, thereby ensuring the reliability of the measurement system. BRIEF DESCRIPTION OF DRAWINGS
[0016] Figure 1 A cross-sectional view of an automatic mobile heat release rate measuring device provided by the present application.
[0017] Figure 2 A cross-sectional view of a support cylinder assembly in an automatic mobile heat release rate measuring device provided by the present application.
[0018] Figure 3 A side view of an automatic mobile heat release rate measuring device provided by the present application.
[0019] Figure 4 A cross-sectional view of one of the calorimeters in an automatic mobile heat release rate measuring device provided by the present application.
[0020] Figure 5 A cross-sectional view of another calorimeter in an automatic mobile heat release rate measuring device provided by the present application. Figure 4 A local enlarged view of position A in the present application.
[0021] Figure 6 A cross-sectional view of another calorimeter in an automatic mobile heat release rate measuring device provided by the present application.
[0022] Reference signs: 1 - support cylinder assembly, 11 - protection tube, 12 - mouse dragon flange, 13 - guide pipe, 14 - lower joint, 15 - filter cylinder, 2 - calorimeter, 20 - fixing hole, 21 - test bridge, 22 - calibration bridge, 23 - mounting cylinder, 24 - sleeve, 25 - heating rod, 26 - pipe body, 27 - top cover, 28 - bottom cover, 3 - positioning flange, 4 - sealing assembly, 41 - adapter, 42 - heating wire sealing head, 43 - thermocouple sealing head, 44 - gas pipe joint, 5 - sample. DETAILED DESCRIPTION
[0023] The specific embodiments are described below in conjunction with the accompanying drawings.
[0024] EMBODIMENT As Figures 1 to 6As shown, in the embodiment, an automatic mobile heat release rate measuring device is mainly disclosed, which is suitable for measuring the heat release rate of a sample 5 made of stainless steel, aluminum alloy or zirconium alloy, and includes a support cylinder assembly 1. The support cylinder assembly 1 includes a protective tube 11, in which a calorimeter 2 for measuring the heat release rate of the sample 5 is arranged. The calorimeter 2 is respectively provided with a test bridge 21 and a calibration bridge 22. One end of the test bridge 21 is fixed to the end of the calorimeter 2, and the other end of the test bridge 21 is suspended and provided with the sample 5. One end of the calibration bridge 22 is fixed to the end of the calorimeter 2, and the other end of the calibration bridge 22 is suspended. The test bridge 21 and the calibration bridge 22 are respectively provided with a plurality of thermocouples arranged in the axial direction. One end of the protective tube 11 is sealingly connected with a mouse dragon flange 12. The protective tube 11 is slidingly sleeved with a positioning flange 3 abutting against the mouse dragon flange 12 for connecting the reactor. The mouse dragon flange 12 is sealingly provided with an air inlet pipe and an air outlet pipe in communication with the inside of the calorimeter 2. Specifically, the protective tube 11 of the support cylinder assembly 1 provides stable protection for the calorimeter 2, and can adapt to the complex environment of high pressure and radiation in the reactor. The test bridge 21 and the calibration bridge 22 in the calorimeter 2 form a core contrast system. During the test, the test bridge 21 provided with the sample 5 and the calibration bridge 22 provided without the sample 5 synchronously collect temperature data through the axially arranged thermocouples. The temperature difference between the two can effectively eliminate the interference of non-sample 5 factors such as coolant flow and environmental radiation, and directly reflect the heat release characteristics of the sample 5 itself. It should be noted that the mouse dragon flange 12 is connected with an existing lifting system to realize the axial movement of the support cylinder assembly 1. The abutting cooperation between the mouse dragon flange 12 and the positioning flange 3 limits the insertion depth of the support cylinder assembly 1, and meets the continuous measurement requirements at different positions in the channel. The air inlet pipe and the air outlet pipe are connected with inert gas (such as helium) to build a closed thermal environment. During the test, the gas flow can be adjusted to stabilize the heat field of the sample 5. The overall structure not only ensures the accuracy of the measurement, but also realizes the core function of mobile measurement.
[0025] Further, in specific implementation, the above-mentioned two calorimeters 2 are arranged in the axial direction along the protective tube 11, and the two calorimeters 2 are circumferentially staggered and relatively fixed. Specifically, the two calorimeters 2 are distributed in the axial direction and fixed in the circumferential direction. During the test, the heat release rate data of two axial positions in the channel can be synchronously obtained. By comparing and analyzing the measurement results of the two, the axial heat release distribution rule of the channel can be quickly captured, and the problem of one-sidedness of the traditional single-point measurement data is solved. The circumferential staggered arrangement avoids the thermal field superposition interference of the two calorimeters 2 during the measurement, and the relatively fixed structure ensures the position repeatability of multiple measurements, so that the heat release gradient analysis in the channel is more reliable, and the capture ability of the complex core heat release distribution is significantly improved.
[0026] Further, in the specific implementation, the free end of the test bridge 21 and the calibration bridge 22 in the above-mentioned calorimeter 2 provided by the embodiment of the present application is provided with a mounting cylinder 23, a heating rod 25 is connected in the mounting cylinder 23 through a sleeve 24, and the sample 5 is arranged between the mounting cylinder 23 and the sleeve 24 of the test bridge 21; and the free end of the test bridge 21 of the other calorimeter 2 is threadedly connected with the sample 5. Specifically, two sample 5 mounting modes are designed to form a functional comparison. In the test process, the calorimeter 2 with the heating rod 25 can change the temperature gradient of the sample 5 by adjusting the heating power, simulate the heat release characteristics under different working conditions, and the cooperation of the mounting cylinder 23 and the sleeve 24 ensures the close contact between the sample 5 and the heating rod 25, so that the heat transfer is uniform and stable. In the comparative test, by comparing the heat release rate change before and after heating, the influence of temperature on the heat release of the material can be analyzed; the calorimeter 2 with thread connection is suitable for rapid replacement of the sample 5, and in the test, different samples 5 can be installed multiple times through the same structure to compare the heat release difference. The combination of the two modes makes the device not only meet the fine working condition simulation, but also adapt to the rapid testing of multiple samples 5, greatly expanding the application scenarios.
[0027] Further, in the specific implementation, the above-mentioned calorimeter 2 provided by the embodiment of the present application is connected with a sealing assembly 4 through a connecting pipe, the sealing assembly 4 includes an adapter 41 and a heating wire sealing head 42, a thermocouple sealing head 43 and an air pipe joint 44 connected with the adapter 41 respectively, the air pipe joint 44 is in communication with the gas inlet pipe and the gas outlet pipe respectively, and the gas inlet pipe and the gas outlet pipe are arranged in the connecting pipe, the heating wire sealing head 42 is connected with the heating rod 25 through a heating wire, the thermocouple sealing head 43 is connected with a thermocouple, and the heating wire and the thermocouple are arranged in the gas outlet pipe. The sealing assembly 4 and the connecting pipe form a multiple protection system. In the test process, the heating wire sealing head 42 and the thermocouple sealing head 43 integrated by the adapter 41 can form sealing protection for the heating wire and the thermocouple wire respectively, which can effectively avoid the damage of the in-pile radiation to the wire and reduce the signal interference; the heating wire and the thermocouple are arranged in the gas outlet pipe, and the gas outlet pipe plays a protective role.
[0028] Further, in specific implementation, a plurality of fixing holes 20 are formed on the outer periphery of the test bridge 21 and the calibration bridge 22 provided by the embodiment of the present application, and the fixing holes 20 are inclined to the sample 5 for fixing the thermocouple. Specifically, the test bridge 21 and the calibration bridge 22 in the same calorimeter 2 have the same length, and in one of the calorimeters 2, the test bridge 21 and the calibration bridge 22 have a diameter of 5.8mm-6.3mm, and the test bridge 21 and the calibration bridge 22 can be respectively machined with three fixing holes 20, and the hole spacing of the fixing holes 20 is 40mm-45mm; in the other of the calorimeters 2, the test bridge 21 and the calibration bridge 22 have a diameter of 5.5mm-6.5mm, and the test bridge 21 and the calibration bridge 22 are also respectively machined with three fixing holes 20, and the hole spacing of the fixing holes 20 is 38mm-45mm. During the test, the thermocouple is in inclined contact with the test bridge 21 and the calibration bridge 22 through the fixing holes 20, which not only increases the contact area, but also improves the temperature response speed of the thermocouple in the test, and can more accurately capture the instantaneous change of the heat release of the sample 5; the thermocouple measurement end is close to the heat conduction path of the sample 5 by being inclined (such as 45°) to the sample 5. The physical limiting effect of the fixing holes 20 avoids the loosening of the thermocouple when the device moves, and ensures the consistency of the temperature collection point in multiple measurements, thereby providing a stable data basis for the calculation of the heat release rate.
[0029] Further, in specific implementation, the above calorimeter 2 provided by the embodiment of the present application includes a tube body 26 and a top cover 27 and a bottom cover 28 arranged at both ends of the tube body 26 respectively, the top cover 27 is provided with a first connecting hole for sealing the inlet gas pipe and the outlet gas pipe, and the inner end face of the bottom cover 28 is provided with a second connecting hole for inserting the test bridge 21 and the calibration bridge 22. The modular structure of the calorimeter 2 facilitates the test operation, and the detachable design of the top cover 27 and the bottom cover 28 allows the test bridge 21 or the calibration bridge 22 to be quickly replaced during the test, thereby improving the assembly efficiency.
[0030] Further, in specific implementation, the outlet of the above gas inlet pipe is close to the bottom cover 28. During the test, the inert gas directly acts on the area where the sample 5 is located from the outlet, so that the inert gas can fully fill the inner cavity of the calorimeter 2, maintain uniform temperature distribution in the cavity, and further improve the accuracy of the monitoring data of the thermocouple, thereby providing a more reliable temperature basis for the test analysis.
[0031] Further, in the specific implementation, the other end of the protection tube 11 is connected with a guide tube 13, a filter cartridge 15 is arranged between the protection tube 11 and the guide tube 13, and the guide tube 13 is inserted and matched with a lower joint 14. A water inlet hole is formed in the side wall of the protection tube 11, and the end of the guide tube 13 is a water outlet hole. The coolant enters the gap between the protection tube 11 and the calorimeter 2 from the water inlet hole, and is discharged from the water outlet hole after absorbing the working heat of the calorimeter 2. Specifically, the lower joint 14 includes an outer cylinder and an inner plug rod. The outer cylinder is matched with the guide tube 13 to provide axial guidance for the overall movement of the support cylinder assembly 1, reduce movement deviation and shaking, and ensure the accuracy of the measurement position. The inner plug rod is inserted into the water outlet hole to play a throttling role.
[0032] Further, in the specific implementation, the test bridge 21 and the calibration bridge 22 provided by the embodiment of the present application are both rod-shaped structures made of aluminum alloy. The high thermal conductivity of the aluminum alloy enables the heat released by the sample 5 to be quickly transferred to the thermocouple, so that the instantaneous heat release change can be accurately captured.
Claims
1. An automated mobile heat release rate measuring device, characterized in that, The system includes a support cylinder assembly (1), which includes a protective tube (11). A calorimeter (2) for measuring the heat release rate of a sample (5) is installed inside the protective tube (11). The calorimeter (2) contains a test bridge (21) and a calibration bridge (22). One end of the test bridge (21) is fixed to the end of the calorimeter (2), and the other end of the test bridge (21) is suspended and has the sample (5) mounted on it. One end of the calibration bridge (22) is connected to the calorimeter. (2) The end is fixed, and the other end of the calibration bridge (22) is suspended. Several thermocouples are installed on the test bridge (21) and the calibration bridge (22) along the axial direction. One end of the protective tube (11) is sealed and connected to a rat-long flange (12). The protective tube (11) is slidably sleeved with a positioning flange (3) that abuts against the rat-long flange (12) for connecting the reactor. The rat-long flange (12) is sealed and has an inlet pipe and an outlet pipe that communicate with the inside of the calorimeter (2).
2. The automated mobile heat release rate measuring device according to claim 1, characterized in that, Two calorimeters (2) are arranged along the axial direction of the protective tube (11), and the two calorimeters (2) are arranged circumferentially and fixed relative to each other.
3. The automated mobile heat release rate measuring device according to claim 2, characterized in that, In one of the calorimeters (2), the suspended ends of the test bridge (21) and the calibration bridge (22) are provided with mounting cylinders (23), and a heating rod (25) is connected to the mounting cylinder (23) through a sleeve (24). The sample (5) is placed between the mounting cylinder (23) and the sleeve (24) of the test bridge (21). The suspended end of the test bridge (21) of another calorimeter (2) is threadedly connected to the sample (5).
4. The automated mobile heat release rate measuring device according to claim 3, characterized in that, The calorimeter (2) is connected to a sealing assembly (4) via a connecting pipe. The sealing assembly (4) includes an adapter (41) and a heating wire sealing head (42), a thermocouple sealing head (43), and a gas pipe connector (44) connected to the adapter (41). The gas pipe connector (44) is connected to the inlet pipe and the outlet pipe, respectively. The inlet pipe and the outlet pipe are both located inside the connecting pipe. The heating wire sealing head (42) is connected to the heating rod (25) via a heating wire. The thermocouple sealing head (43) is connected to the thermocouple. The heating wire and the thermocouple are both inserted inside the outlet pipe.
5. The automated mobile heat release rate measuring device according to claim 1, characterized in that, The outer periphery of both the test bridge (21) and the calibration bridge (22) is provided with a plurality of fixing holes (20) that are inclined toward the sample (5) for fixing the thermocouple.
6. The automated mobile heat release rate measuring device according to claim 1, characterized in that, The calorimeter (2) includes a tube body (26) and a top cover (27) and a bottom cover (28) respectively disposed at both ends of the tube body (26). The top cover (27) has a first connecting hole for sealing the air inlet pipe and the air outlet pipe. The bottom cover (28) has a second connecting hole on its inner end face for inserting the test bridge (21) and the calibration bridge (22).
7. The automated mobile heat release rate measuring device according to claim 6, characterized in that, The outlet of the air intake pipe is located near the bottom cover (28).
8. The automated mobile heat release rate measuring device according to claim 1, characterized in that, The other end of the protective tube (11) is connected to a guide tube (13), and a filter cartridge (15) is provided between the guide tube (13) and the protective tube (11). The guide tube (13) is inserted into a lower connector (14).
9. An automated mobile heat release rate measuring device according to claim 8, characterized in that, The protective tube (11) has a water inlet hole on its side wall, and the guide tube (13) has a water outlet hole at its end.
10. The automated mobile heat release rate measuring device according to claim 1, characterized in that, Both the test bridge (21) and the calibration bridge (22) are rod-shaped structures made of aluminum alloy.