An experimental body heating and temperature measuring system for electrically heating a simulated fuel rod cladding tube in a gas

Abstract

The application provides a system for heating and temperature measurement of a simulated fuel rod cladding tube in a gas. The system comprises an inert gas high-pressure tank, a cladding tube heating and temperature measurement device, a cooling water tank, a cooling water pump, an exhaust treatment gas tank, a heating power supply, a general control computer and a matching pipeline. The inert gas high-pressure tank provides gas, the cladding tube heating and temperature measurement device provides a sealed environment and temperature measurement conditions, the heating power supply controls the output power of the current, and the cooling water tank and the radiator provide circulating cooling water to achieve the purpose of heating and temperature measurement of a simulated fuel rod cladding tube in a gas.

Description

Technical Field

[0001] This invention relates to the field of DC current heating of electric heating rods and temperature measurement at various axial positions, and in particular to a heating and temperature measurement system for an experimental body of a simulated fuel rod cladding tube in a gas atmosphere. Background Technology

[0002] Nuclear energy, as a clean energy source, has always attracted much attention from scholars in various research fields. In the field of reactor thermal-hydraulic engineering, the fabrication of simulated fuel assemblies is becoming an increasingly urgent need due to the need to investigate thermal-hydraulic parameters such as CHF (hydrogen peroxide) of fuel assemblies. Considering that the direct heating of cladding tubes to simulate fuel assemblies has the advantages of simple structure and ease of placement of detection equipment, electrically heated simulated fuel rod cladding tubes have become a research focus in the aforementioned field. Before entering the rod bundle experiment stage, the aforementioned cladding tubes must undergo a series of heating and pressurization tests to determine their quality.

[0003] Existing tests for simulating fuel rod cladding heating and pressurization using electric heating often employ rod bundle experiments, which involve assembling a set of cladding tubes into a rod bundle and testing it on a thermal-hydraulic test bench. However, this testing method has drawbacks such as high operational difficulty and cost, making the quality testing threshold for cladding tubes too high. It often requires more research funding and time, significantly hindering the development of reactor thermal-hydraulic experiments and the progress of research in related fields.

[0004] In summary, it is necessary to design a heating and temperature measurement system for an electrically heated simulated fuel rod cladding tube in a gaseous environment. This system provides a new approach for testing electrically heated simulated fuel rod cladding tubes and significantly lowers the barrier to entry for reactor thermal-hydraulic experiments, thus facilitating research in this field. Summary of the Invention

[0005] The purpose of this invention is to solve the problems in the prior art and to propose a heating and temperature measurement system for an experimental body of a simulated fuel rod cladding tube in a gas atmosphere using electric heating.

[0006] This invention is achieved through the following technical solution: This invention proposes a gas-based electrically heated simulation fuel rod cladding tube experimental body heating and temperature measurement system. The system includes an inert gas high-pressure tank, a cladding tube heating and temperature measurement device, a cooling water tank, a cooling water pump, an exhaust gas treatment tank, a heating power supply, and a central control computer. The cladding tube heating and temperature measurement device is connected to the inert gas high-pressure tank, cooling water tank, cooling water pump, exhaust gas treatment tank, heating power supply, and central control computer via relevant pipelines. The inert gas high-pressure tank provides a sealed gas environment within the chamber. The cooling water pump in the cooling water tank provides cooling to the heated cladding tube via relevant pipelines. The exhaust gas treatment tank collects overflow and inert gas after the experiment for centralized processing. The heating power supply controls the DC output power during the heating process. The central control computer controls the stroke program output of the temperature probe drive device in the cladding tube heating and temperature measurement device.

[0007] Furthermore, the heating and temperature measuring device for the casing tube includes a temperature probe drive device, a temperature probe, a drive motor, a radiator and casing tube support frame, an insulating joint, a heating extension section, and a casing tube; the heating and temperature measuring device for the casing tube is housed in a sealed box; the temperature probe is mounted on the temperature probe drive device, and is driven by the drive motor to make displacement relative to the axial direction of the casing tube to detect the temperature at different axial positions of the casing tube during electric heating; the radiator and casing tube are fixed on the radiator and casing tube support frame; heating extension sections are installed at both ends of the casing tube, and the current is blocked between the heating extension sections and the radiator and casing tube support frame by an insulating joint; the casing tube is located on the same horizontal plane as the detection point of the temperature probe in the vertical position, and its midpoint and the midpoint of the temperature probe's travel share the same normal in the horizontal position; the radiator is located directly above the casing tube in the vertical position, and its midpoint coincides with the midpoint of the casing tube in the horizontal position.

[0008] Furthermore, the inert gas high-pressure tank is connected to a pre-fabricated opening on the sealed box via a tank pipeline to provide the inert gas required during the heating process.

[0009] Furthermore, the cooling water tank and cooling water pump are connected to the radiator through cooling water pipelines passing through pre-made openings on the sealed box to provide the cold source required during the heating process.

[0010] Furthermore, the exhaust gas tank is connected to a pre-made opening on the sealed box via a gas tank pipeline to collect the inert gas that overflows during the heating process due to the expansion of the gas space and after the heating is completed, for subsequent processing.

[0011] Furthermore, the heating power supply is connected to the heating extension section via a related cable passing through a pre-made opening on the sealed box to provide the DC current output power required during the heating process.

[0012] Furthermore, the sealed box has several pre-fabricated openings for passing through relevant pipelines, and the gaps between these pre-fabricated openings and pre-fabricated pipelines are all sealed to ensure that the gas inside the sealed box does not exchange mass with the outside.

[0013] Furthermore, before the system heating begins, the casing tube is fixed to the radiator and casing tube support frame via the heating extension section and insulating joint. The heating power supply electrodes are connected to both ends of the heating extension section to ensure that the current output by the heating power supply flows only through the casing tube and not through the radiator and the radiator and casing tube support frame. The cooling water pipe is connected to both ends of the radiator, and one end of the pipe is connected to the cooling water pump in the cooling water tank to ensure that the cooling water forms a cooling loop of cooling water tank → radiator → cooling water tank. The programmed temperature probe driver is uploaded to the central control computer and checked through the drive motor to ensure that its stroke and dwell time meet the design requirements. After the above process, the sealed box is closed. The inert gas high-pressure tank is connected to the pre-fabricated opening on the sealed box through relevant pipelines, and the exhaust gas tank is connected to another pre-fabricated opening on the sealed box.

[0014] Furthermore, when the system heating begins, the cooling water pump is started first, so that the cooling water can flow in the cooling circuit of cooling water tank → radiator → cooling water tank; the heating power supply is started, and a DC current with a preset power is output; after the temperature probe shows that the temperature of the cladding tube tends to stabilize, the driver program of the temperature probe drive device in the central control computer is started to drive the temperature probe drive device to move according to the predetermined stroke, and record the stable temperature of each position of the cladding tube along the axial direction.

[0015] Furthermore, after the system heating is completed, the driver program of the temperature probe in the central control computer is turned off, so that the temperature probe driver stops moving; the heating power is turned off to interrupt the current output; after the temperature probe shows that the temperature of the casing tube has cooled to room temperature, the cooling water pump in the cooling water tank is turned off, and the radiator loses its circulating cooling capacity; the inert gas high-pressure tank is turned off, and the remaining inert gas in the sealed box is introduced into the exhaust treatment tank.

[0016] The beneficial effects of this invention are: (1) Considering the actual operation during the heating process, an insulating joint was designed for possible contact between the radiator and the shell tube support frame and the shell tube.

[0017] (2) Compared with the existing test of electric heating to simulate fuel rod cladding tubes, the test scheme of the present invention is more convenient to operate and has a lower cost. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the heating and temperature measurement system for an experimental body of an electrically heated simulated fuel rod cladding tube in a gas environment, as described in this invention. Figure 2 This is a schematic diagram of the heating and temperature measuring device for the cladding tube. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Combination Figures 1-2 This invention proposes a gas-based electrically heated simulation fuel rod cladding tube heating and temperature measurement system. The system includes an inert gas high-pressure tank, a cladding tube heating and temperature measurement device, a cooling water tank, a cooling water pump, an exhaust gas treatment tank, a heating power supply, and a central control computer. The cladding tube heating and temperature measurement device is connected to the inert gas high-pressure tank, cooling water tank, cooling water pump, exhaust gas treatment tank, heating power supply, and central control computer via relevant pipelines. The inert gas high-pressure tank provides a sealed gas environment within the chamber. The cooling water pump in the cooling water tank provides cooling to the heated cladding tube via relevant pipelines. The exhaust gas treatment tank collects overflow and inert gas after the experiment for centralized processing. The heating power supply controls the DC output power during the heating process. The central control computer controls the stroke program output of the temperature probe drive device in the cladding tube heating and temperature measurement device.

[0022] Furthermore, the heating and temperature measuring device for the casing tube includes a temperature probe drive device, a temperature probe, a drive motor, a radiator and casing tube support frame, an insulating joint, a heating extension section, and a casing tube; the heating and temperature measuring device for the casing tube is housed in a sealed box; the temperature probe is mounted on the temperature probe drive device, and is driven by the drive motor to make displacement relative to the axial direction of the casing tube to detect the temperature at different axial positions of the casing tube during electric heating; the radiator and casing tube are fixed on the radiator and casing tube support frame; heating extension sections are installed at both ends of the casing tube, and the current is blocked between the heating extension sections and the radiator and casing tube support frame by an insulating joint; the casing tube is located on the same horizontal plane as the detection point of the temperature probe in the vertical position, and its midpoint and the midpoint of the temperature probe's travel share the same normal in the horizontal position; the radiator is located directly above the casing tube in the vertical position, and its midpoint coincides with the midpoint of the casing tube in the horizontal position.

[0023] Furthermore, the inert gas high-pressure tank is connected to a pre-fabricated opening on the sealed box via a tank pipeline to provide the inert gas required during the heating process.

[0024] Furthermore, the cooling water tank and cooling water pump are connected to the radiator through cooling water pipelines passing through pre-made openings on the sealed box to provide the cold source required during the heating process.

[0025] Furthermore, the exhaust gas tank is connected to a pre-made opening on the sealed box via a gas tank pipeline to collect the inert gas that overflows during the heating process due to the expansion of the gas space and after the heating is completed, for subsequent processing.

[0026] Furthermore, the heating power supply is connected to the heating extension section via a related cable passing through a pre-made opening on the sealed box to provide the DC current output power required during the heating process.

[0027] Furthermore, the sealed box has several pre-fabricated openings for passing through relevant pipelines, and the gaps between these pre-fabricated openings and pre-fabricated pipelines are all sealed to ensure that the gas inside the sealed box does not exchange mass with the outside.

[0028] Furthermore, before the system heating begins, the casing tube is fixed to the radiator and casing tube support frame via the heating extension section and insulating joint. The heating power supply electrodes are connected to both ends of the heating extension section to ensure that the current output by the heating power supply flows only through the casing tube and not through the radiator and the radiator and casing tube support frame. The cooling water pipe is connected to both ends of the radiator, and one end of the pipe is connected to the cooling water pump in the cooling water tank to ensure that the cooling water forms a cooling loop of cooling water tank → radiator → cooling water tank. The programmed temperature probe driver is uploaded to the central control computer and checked through the drive motor to ensure that its stroke and dwell time meet the design requirements. After the above process, the sealed box is closed. The inert gas high-pressure tank is connected to the pre-fabricated opening on the sealed box through relevant pipelines, and the exhaust gas tank is connected to another pre-fabricated opening on the sealed box.

[0029] Furthermore, when the system heating begins, the cooling water pump is started first, so that the cooling water can flow in the cooling circuit of cooling water tank → radiator → cooling water tank; the heating power supply is started, and a DC current with a preset power is output; after the temperature probe shows that the temperature of the cladding tube tends to stabilize, the driver program of the temperature probe drive device in the central control computer is started to drive the temperature probe drive device to move according to the predetermined stroke, and record the stable temperature of each position of the cladding tube along the axial direction.

[0030] Furthermore, after the system heating is completed, the driver program of the temperature probe in the central control computer is turned off, so that the temperature probe driver stops moving; the heating power is turned off to interrupt the current output; after the temperature probe shows that the temperature of the casing tube has cooled to room temperature, the cooling water pump in the cooling water tank is turned off, and the radiator loses its circulating cooling capacity; the inert gas high-pressure tank is turned off, and the remaining inert gas in the sealed box is introduced into the exhaust treatment tank.

[0031] This invention proposes a gas-based electrically heated simulation system for heating and measuring the temperature of a fuel rod cladding tube. The system includes an inert gas high-pressure tank, a cladding tube heating and temperature measuring device, a cooling water tank, a cooling water pump, an exhaust gas treatment tank, a heating power supply, a central control computer, and associated piping. The system utilizes an inert gas high-pressure tank for gas supply, the cladding tube heating and temperature measuring device for a sealed environment and temperature measurement conditions, the heating power supply for controlling current output power, and a cooling water tank and radiator for circulating cooling water to achieve the purpose of heating and measuring the temperature of the simulated fuel rod cladding tube. The cladding tube heating and temperature measurement device comprises a temperature probe drive unit, a temperature probe, a drive motor, a radiator and cladding tube support frame, an insulating joint, a heating extension section, the cladding tube, and a sealed box. It is connected to an inert gas high-pressure tank, a cooling water tank, a cooling water pump, an exhaust gas treatment tank, a heating power supply, and a central control computer via relevant pipelines. The inert gas high-pressure tank provides the gas environment within the sealed box; the cooling water pump in the cooling water tank provides cooling to the heated cladding tube through relevant pipelines; the exhaust gas treatment tank collects overflow and inert gas awaiting centralized treatment after the experiment; the heating power supply controls the DC output power during the heating process; and the central control computer controls the stroke program output of the temperature probe drive unit. This invention provides a heating and temperature measurement process and implementation system for a simulated fuel rod cladding tube experiment based on electric heating in a gas environment.

[0032] Example The system described in this application will now be described in detail with reference to the accompanying drawings.

[0033] Combination Figure 1 The heating and temperature measurement system for an experimental body simulating a fuel rod cladding tube in a gas-fired electrically heated environment includes an inert gas high-pressure tank 1, a cladding tube heating and temperature measurement device 2, a cooling water tank 3, a cooling water pump 4, an exhaust gas treatment tank 5, a heating power supply 6, and a central control computer 7. The cladding tube heating and temperature measurement device 2 is connected to the inert gas high-pressure tank 1, cooling water tank 3, cooling water pump 4, exhaust gas treatment tank 5, heating power supply 6, and central control computer 7 via relevant pipelines. The inert gas high-pressure tank 1 provides the gas environment within the sealed chamber 16. The cooling water pump 4 in the cooling water tank 3 provides cooling to the heated cladding tube 15 via relevant pipelines. The exhaust gas treatment tank 5 collects overflow and inert gas after the experiment for centralized processing. The heating power supply 6 controls the DC power output during the heating process. The central control computer 7 controls the stroke program output of the temperature probe drive device 8 in the cladding tube heating and temperature measurement device 2.

[0034] Combination Figure 2The casing tube heating and temperature measuring device 2 includes a temperature probe drive device 8, a temperature probe 9, a drive motor 10, a radiator and casing tube support frame 11, a radiator 12, an insulating joint 13, a heating extension section 14, and a casing tube 15. The casing tube heating and temperature measuring device 2 is installed inside the sealed box 16. The main function of the casing tube heating and temperature measuring device 2 is to ensure the relative positions of the temperature probe 9, the radiator 12, and the casing tube 15, so that the radiator 12 can remove the heat inside the sealed box 16 and the temperature probe 9 can accurately detect the casing tube 15. The drive motor 10 drives the temperature probe drive device 8 to drive the temperature probe 9 to detect the temperature of the casing tube 15 at various axial positions during heating.

[0035] Before heating begins, the casing tube 15 is fixed to the radiator and casing tube support frame 11 via the heating extension section 14 and the insulating joint 13. The electrodes of the heating power supply 6 are connected to both ends of the heating extension section 14 to ensure that the current output by the heating power supply 6 flows only through the casing tube 15 and not through the radiator 12 and the radiator and casing tube support frame 11. The cooling water pipe is connected to both ends of the radiator 12, and one end of the pipe is connected to the cooling water pump 4 in the cooling water tank 3 to ensure that the cooling water forms a cooling circuit of cooling water tank 3 → radiator 12 → cooling water tank 3. The programmed temperature probe driver 8 is uploaded to the central control computer 7 and checked by the drive motor 10 to ensure that its stroke and dwell time meet the design requirements. After the above process, the sealing box 16 is closed. The inert gas high-pressure tank 1 is connected to the pre-made opening on the sealing box 16 through relevant pipelines, and the exhaust treatment gas tank 5 is connected to another pre-made opening on the sealing box 16.

[0036] When heating begins, the cooling water pump 4 is started first, so that the cooling water can flow in the cooling circuit of cooling water tank 3 → radiator 12 → cooling water tank 3; the heating power supply 6 is started, and the DC current with the preset power is output; after the temperature probe 9 shows that the temperature of the casing tube 15 tends to stabilize, the driver program of the temperature probe drive device 8 in the central control computer 7 is started to drive the temperature probe drive device 8 so that it can move according to the predetermined stroke and record the stable temperature of each position of the casing tube 15 along the axial direction.

[0037] After heating is completed, the driver program of the temperature probe drive device 8 in the main control computer 7 is turned off, so that the temperature probe drive device 8 stops moving; the heating power supply 6 is turned off to interrupt the current output; after the temperature probe 9 shows that the temperature of the casing tube 15 has cooled to room temperature, the cooling water pump 4 in the cooling water tank 3 is turned off, and the radiator 12 loses its circulating cooling capacity; the inert gas high-pressure gas tank 1 is turned off, and the remaining inert gas in the sealed box 16 is introduced into the exhaust treatment gas tank 5.

[0038] The above provides a detailed description of the gas-electrically heated simulated fuel rod cladding tube experimental body heating and temperature measurement system proposed in this invention. Specific examples have been used to illustrate the principle and implementation of this invention. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this invention. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​this invention. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A heating and temperature measurement system for an experimental body simulating a fuel rod cladding tube in a gas atmosphere using electric heating, characterized in that, The system includes an inert gas high-pressure tank, a casing tube heating and temperature measuring device, a cooling water tank, a cooling water pump, an exhaust gas treatment tank, a heating power supply, and a central control computer. The casing tube heating and temperature measuring device is connected to the inert gas high-pressure tank, cooling water tank, cooling water pump, exhaust gas treatment tank, heating power supply, and central control computer via relevant pipelines. The inert gas high-pressure tank provides the gas environment within the sealed chamber. The cooling water pump in the cooling water tank provides cooling to the heated casing tube via relevant pipelines. The exhaust gas treatment tank collects overflow and inert gas after the experiment for centralized processing. The heating power supply controls the DC output power during the heating process. The central control computer controls the stroke program output of the temperature probe drive device in the casing tube heating and temperature measuring device.

2. The system according to claim 1, characterized in that, The aforementioned casing tube heating and temperature measuring device includes a temperature probe drive unit, a temperature probe, a drive motor, a radiator and casing tube support frame, an insulating joint, a heating extension section, and a casing tube. The device is housed within a sealed enclosure. The temperature probe is mounted on the temperature probe drive unit, which, driven by the drive motor, moves relative to the axial direction of the casing tube to detect the temperature at different axial positions of the casing tube during electric heating. The radiator and casing tube are fixed to the radiator and casing tube support frame. Heating extension sections are installed at both ends of the casing tube, and an insulating joint blocks the current between the heating extension sections and the radiator and casing tube support frame. The casing tube is positioned vertically on the same horizontal plane as the temperature probe's detection point, and its midpoint shares a normal with the midpoint of the temperature probe's travel path. The radiator is positioned vertically directly above the casing tube, and its midpoint coincides with the midpoint of the casing tube in the horizontal position.

3. The system according to claim 2, characterized in that, The inert gas high-pressure tank is connected to a pre-fabricated opening on the sealed box via a tank pipeline to provide the inert gas required during the heating process.

4. The system according to claim 2, characterized in that, The cooling water tank and cooling water pump are connected to the radiator through a cooling water pipeline passing through a pre-made opening on the sealed box to provide the cold source required during the heating process.

5. The system according to claim 2, characterized in that, The exhaust gas treatment tank is connected to a pre-fabricated opening on the sealed box via a tank pipeline to collect the inert gas that overflows during the heating process due to gas space expansion and after heating is completed, for subsequent processing.

6. The system according to claim 2, characterized in that, The heating power supply is connected to the heating extension section via a related cable passing through a pre-made opening on the sealed box to provide the DC current output power required during the heating process.

7. The system according to claim 2, characterized in that, The sealed box has several pre-fabricated openings for passing through relevant pipelines, and the gaps between these pre-fabricated openings and the pre-fabricated pipelines are all sealed to ensure that the gas inside the sealed box does not exchange mass with the outside.

8. The system according to claim 1, characterized in that, Before the system heating begins, the casing tube is fixed to the radiator and casing tube support frame via the heating extension section and insulating joint. The heating power supply electrodes are connected to both ends of the heating extension section to ensure that the current output by the heating power supply flows only through the casing tube and not through the radiator and casing tube support frame. The cooling water pipes are connected to both ends of the radiator, and one end of the pipe is connected to the cooling water pump in the cooling water tank to ensure that the cooling water forms a cooling loop of cooling water tank → radiator → cooling water tank. The programmed temperature probe driver is uploaded to the central control computer and checked by the drive motor to ensure that its stroke and dwell time meet the design requirements. After the above process, the sealed box is closed. The inert gas high-pressure tank is connected to the pre-fabricated opening on the sealed box through relevant pipelines, and the exhaust gas tank is connected to another pre-fabricated opening on the sealed box.

9. The system according to claim 8, characterized in that, When the system starts heating, the cooling water pump is started first, so that the cooling water can flow in the cooling circuit of cooling water tank → radiator → cooling water tank; the heating power supply is started, and the DC current with the preset power is output; after the temperature probe shows that the temperature of the cladding tube tends to stabilize, the driver program of the temperature probe drive device in the central control computer is started to drive the temperature probe drive device to move according to the predetermined stroke, and record the stable temperature of each position of the cladding tube along the axial direction.

10. The system according to claim 9, characterized in that, After the system heating is completed, close the driver program of the temperature probe in the central control computer to stop the temperature probe driver from moving; turn off the heating power to interrupt the current output; after the temperature probe shows that the temperature of the casing tube has cooled to room temperature, turn off the cooling water pump in the cooling water tank, and the radiator loses its circulating cooling capacity; close the inert gas high-pressure tank, and introduce the remaining inert gas in the sealed box into the exhaust treatment tank.

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