A closed pressurized gas circuit high-temperature lead-bismuth pump performance testing device

Abstract

The utility model relates to the field of energy utilization discipline, concretely relates to a closed type pressurized gas circuit high temperature lead bismuth pump performance testing device, including melting jar, storage jar, lead bismuth pump, protective gas circuit, vacuum pumping circuit, lead bismuth supply circuit and lead bismuth pump performance testing circuit, can satisfy the performance test of lead bismuth pump to small flow, and the protective gas circuit and vacuum pumping circuit are set up separately to form independent circuit, can avoid the cross common circuit section and lead to pressure interference, and the valve required in the independent circuit is set up correspondingly, does not need to switch the valve frequently to carry out circuit switching in the testing process, reduces the risk of gas leakage or vacuum failure caused by valve failure, and the demand of lead bismuth to temperature in the pipeline can be ensured without using the whole pipeline heat tracing technical means in the testing process, and the cost is reduced.

Description

Technical Field

[0001] This utility model relates to the field of energy utilization, specifically to a performance testing device for a closed-loop pressurized gas circuit high-temperature lead-bismuth pump. Background Technology

[0002] Energy is the foundation upon which human society depends for survival and development. Currently, the world's energy supply mainly comes from primary fossil fuels, which are non-renewable and highly polluting. Against this backdrop, countries worldwide are advocating for the vigorous development of renewable and clean energy sources, such as nuclear, solar, and wind power. Nuclear power technology is the primary form of utilizing nuclear energy. Nuclear energy is a low-carbon, clean energy source. Compared to traditional thermal power, wind power, and solar power, nuclear power has advantages such as low pollution, high stability, long utilization hours, and low requirements for external environmental conditions, thus receiving high attention from countries around the world.

[0003] Currently, the most promising fourth-generation nuclear reactors mainly include sodium-cooled fast reactors (SFR), lead-cooled fast reactors (LFR), molten salt reactors (MSR), supercritical water-cooled reactors (SCWR), gas-cooled fast reactors (GFR), and very high-temperature gas-cooled reactors (VHTR). Among them, lead-bismuth reactors have significant advantages such as inherent safety, ease of miniaturization, and good sustainability, making them an important research direction for advanced nuclear energy systems, and accumulating a wealth of research experience and achievements worldwide. However, due to their complex thermophysical properties and corrosiveness, they pose certain threats to system safety, limiting and hindering the widespread application of lead-bismuth reactors. Therefore, research on high-temperature liquid lead-bismuth metal is of great significance. In existing technologies, lead-bismuth pumps are used for performance testing, but this is mainly for testing the performance of high-flow-rate lead-bismuth pumps, and cannot achieve performance testing of low-flow-rate lead-bismuth pumps. Publication No.: CN108761022A, Title: Performance Testing System and Method for Closed-Circuit Liquid Metal Lead-Bismuth Pump. The system tests the performance of molten lead-bismuth using a lead-bismuth pump and test pipe section. However, the test circuit requires heat tracing and insulation during the test. For the performance testing of a small-flow lead-bismuth pump, the cost of using heat tracing technology for the entire test circuit is relatively high. Furthermore, the vacuum pump is not equipped with a separate pipeline but is connected to the pipeline connected to the test gas source, which limits the degree of freedom of operation.

[0004] Therefore, there is an urgent need for a testing device that can perform performance tests on low-flow lead-bismuth pumps, while also providing a more direct and convenient way to evacuate the pipeline of the testing device. This device can also ensure the temperature requirements of the lead-bismuth in the pipeline without using full pipeline heating during the testing process, thus reducing costs. Utility Model Content

[0005] This utility model aims to provide a closed-loop pressurized gas circuit high-temperature lead-bismuth pump performance testing device, which can meet the performance testing of small-flow lead-bismuth pumps. At the same time, it is more direct and easier to operate when evacuating the pipeline of the testing device. It can also ensure the temperature requirements of lead-bismuth in the pipeline without using full pipeline heating technology during the testing process.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a closed-loop pressurized gas circuit high-temperature lead-bismuth pump performance testing device, comprising a melting tank, a storage tank, a lead-bismuth pump, a protective gas circuit, a vacuum circuit, a lead-bismuth supply circuit, and a lead-bismuth pump performance testing circuit; Protective gas circuit: includes a gas source and a protective gas pipeline. The protective gas pipeline is equipped with a main exhaust valve at the gas source outlet. The main exhaust valve is connected to a first gas branch and a second gas branch. The first gas branch is connected to the top of the melting tank through the first exhaust valve, and the second gas branch is connected to the top of the storage tank through the second exhaust valve. Vacuum circuit: includes a vacuum pump, which is connected to a first vacuum branch and a second vacuum branch. The first vacuum branch is connected to the top of the melting tank through a third exhaust valve, and the second vacuum branch is connected to the top of the storage tank through a fourth exhaust valve. Lead-bismuth supply circuit: The bottom of the melting tank is connected to a supply pipeline and is connected to the bottom of the storage tank in sequence through the first heating element, the first shut-off valve and the second heating element; The lead-bismuth pump performance test circuit consists of a second shut-off valve connected between the first shut-off valve and the second heating element. The second shut-off valve is connected to the lead-bismuth pump. The outlet of the lead-bismuth pump is connected to the third shut-off valve. The outlet of the third shut-off valve is connected to the flow meter of the lead-bismuth pump performance test circuit. A third heating element and a fourth heating element are provided between the flow meter and the third shut-off valve. The outlet of the flow meter is connected to the fourth shut-off valve. The outlet of the fourth shut-off valve is connected to a standardized test section. The outlet of the standardized test section is connected to the fifth shut-off valve. The outlet of the fifth shut-off valve is connected to the sixth shut-off valve. The outlet of the sixth shut-off valve is connected to the top of the storage tank.

[0007] The beneficial effects of this solution are as follows: This utility model provides a closed-loop pressurized gas circuit high-temperature lead-bismuth pump performance testing device. While meeting the performance testing requirements of small-flow lead-bismuth pumps, it separates the protective gas circuit and the vacuum circuit into independent circuits. This separation avoids pressure interference caused by shared circuit sections. Furthermore, each independent circuit has its own required valves, eliminating the need for frequent valve switching during testing and reducing the risk of gas leakage or vacuum failure due to valve malfunction. The vacuum circuit can operate simultaneously with the protective gas circuit to assist in regulating the pressure in the melting and storage tanks. The device also ensures the required temperature for lead-bismuth in the pipeline without requiring full-pipeline heating during testing, thus reducing costs.

[0008] Furthermore, the melting tank is provided with a first heating ring for heating and melting lead and bismuth, and a melting tank insulation layer is provided between the melting tank and the first heating ring. The storage tank is provided with a second heating ring for maintaining the molten state of lead and bismuth, and a storage tank insulation layer is provided between the storage tank and the second heating ring.

[0009] Furthermore, the melting tank is provided with a first heating ring for heating and melting lead and bismuth, and a melting tank insulation layer is provided between the melting tank and the first heating ring. The storage tank is provided with a second heating ring for maintaining the molten state of lead and bismuth, and a storage tank insulation layer is provided between the storage tank and the second heating ring.

[0010] Furthermore, the melting tank is equipped with a first lead-bismuth temperature sensor, a first heating coil temperature sensor, and a first liquid level sensor, while the storage tank is equipped with a second lead-bismuth temperature sensor, a second heating coil temperature sensor, and a second liquid level sensor.

[0011] Furthermore, the spacing between the second and third heating elements in the lead-bismuth supply circuit is the same as the spacing between the third and fourth heating elements in the lead-bismuth supply circuit.

[0012] Furthermore, the spacing between the first and second heating elements in the lead-bismuth supply circuit is the same as the spacing between the second and third heating elements in the lead-bismuth supply circuit.

[0013] Furthermore, a first heating element temperature sensor, a second heating element temperature sensor, a third heating element temperature sensor, and a fourth heating element temperature sensor are respectively provided next to the four heating elements.

[0014] Furthermore, the lead-bismuth pump is equipped with an inlet pressure sensor and an outlet pressure sensor, respectively. The lead-bismuth pump is also equipped with a torque and speed tester and a third lead-bismuth temperature sensor for detecting the temperature of the lead-bismuth pump. The lead-bismuth pump is also equipped with a lead-bismuth pump insulation layer on the outside.

[0015] Furthermore, a flow meter is also installed on the lead-bismuth pump performance test circuit to detect the flow rate of molten lead-bismuth in the lead-bismuth supply circuit.

[0016] Furthermore, the protective gas circuit, vacuum circuit, lead-bismuth supply circuit, and lead-bismuth pump performance testing circuit are all covered with an insulation layer.

[0017] Furthermore, it also includes a control unit, to which all sensors, exhaust valves, and shut-off valves are connected. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the thermal insulation structure of this utility model; Figure 3 for Figure 2 An enlarged schematic diagram of part A in the middle.

[0019] The following detailed description illustrates the specific implementation method: The reference numerals in the accompanying drawings include: gas source 1, main exhaust valve 1-1, first exhaust valve 1-2, second exhaust valve 1-3, first pressure sensor 1-4, second pressure sensor 1-5, vacuum pump 2, third exhaust valve 2-1, fourth exhaust valve 2-2, third pressure sensor 2-3, fourth pressure sensor 2-4, melting tank 3, first lead-bismuth temperature sensor 3-1, first heating coil temperature sensor 3-2, first liquid level sensor 3-3, first heating coil 3-4, melting tank insulation layer 3-5, first heating element 3-6, first heating element temperature sensor 3-7, first shut-off valve 3-8, storage tank 4, second lead-bismuth temperature sensor 4-1, second heating coil temperature sensor 4-2, second liquid level sensor 4-3, second heating coil 4- 4. Storage tank insulation layer; 4-5. Second heating element; 4-6. Second heating element temperature sensor; 4-7. Second shut-off valve; 4-8. Lead-bismuth pump; 5. Inlet pressure sensor; 5-1. Outlet pressure sensor; 5-2. Third shut-off valve; 5-3. Third heating element; 5-4. Third heating element temperature sensor; 5-5. Lead-bismuth pump insulation layer; 5-6. Third lead-bismuth temperature sensor; 5-7. Torque and speed tester; 5-8. Standardized test section; 6. Fourth shut-off valve; 6-1. Fifth shut-off valve; 6-2. Flow meter; 6-3. Fourth heating element; 6-4. Sixth shut-off valve; 6-5. Fourth heating element temperature sensor; 6-6. Control unit; 7. Tank wall; 8. Pressure plate; 9. Insulation pad; 10. Elastic element; 11. Support guide; 12. Outer sealing layer; 13. Insulation material; 14. Adjusting nut; 15. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0021] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0022] The basic implementation examples are as follows: Figure 1As shown in the figure: This embodiment of a closed-loop pressurized gas circuit high-temperature lead-bismuth pump performance testing device includes a melting tank 3, a storage tank 4, a lead-bismuth pump 5, a protective gas circuit, a vacuum circuit, a lead-bismuth supply circuit, and a lead-bismuth pump performance testing circuit. The lead-bismuth pump 5 is a key piece of equipment in the lead-bismuth cooling fast reactor, used to transport high-temperature liquid lead-bismuth. The melting tank 3 is used to heat and melt solid lead-bismuth to form high-temperature liquid lead-bismuth. The storage tank 4 is used to store high-temperature liquid lead-bismuth in the lead-bismuth supply circuit and the lead-bismuth pump performance test circuit.

[0023] Protective gas circuit: includes gas source 1 and protective gas pipeline. The protective gas pipeline is equipped with a main exhaust valve 1-1 at the outlet of gas source 1. The main exhaust valve 1-1 is connected to a first gas branch and a second gas branch. The first gas branch is connected to the top of melting tank 3 through a first exhaust valve 1-2, and the second gas branch is connected to the top of storage tank 4 through a second exhaust valve 1-3. Gas source 1 can be an inert gas that does not react with lead and bismuth. As a preferred embodiment, argon is used. Argon does not participate in chemical reactions at room temperature to high temperature and is insoluble in liquid metal. A first pressure sensor 1-4 and a second pressure sensor 1-5 can be respectively installed on the first gas branch and the second gas branch to monitor the real-time gas pressure of the first gas branch and the second gas branch.

[0024] Vacuum circuit: includes vacuum pump 2, which is connected to a first vacuum branch and a second vacuum branch. The first vacuum branch is connected to the top of the melting tank 3 through a third exhaust valve 2-1, and the second vacuum branch is connected to the top of the storage tank 4 through a fourth exhaust valve 2-2. The vacuum circuit is used to evacuate the first vacuum branch, the second vacuum branch, the melting tank 3, the storage tank 4, the lead-bismuth pump performance test circuit, and the lead-bismuth supply circuit before testing. A third pressure sensor 2-3 and a fourth pressure sensor 2-4 can be respectively installed on the first vacuum branch and the second vacuum branch to monitor the real-time gas pressure on the first vacuum branch and the second vacuum branch.

[0025] Lead-bismuth supply circuit: The bottom of the melting tank 3 is connected to a supply pipeline and is connected to the bottom of the storage tank 4 in sequence through the first heating element 3-6, the first shut-off valve 3-8 and the second heating element 4-6; the lead-bismuth supply circuit is used to transport the molten high-temperature liquid lead-bismuth in the melting tank 3 to the storage tank 4.

[0026] The lead-bismuth pump performance test circuit is as follows: The second shut-off valve 4-8 is connected between the first shut-off valve 3-8 and the second heating element 4-6. The second shut-off valve 4-8 is connected to the lead-bismuth pump 5. The outlet of the lead-bismuth pump 5 is connected to the third shut-off valve 5-3. The outlet of the third shut-off valve 5-3 is connected to the flow meter 6-3 of the lead-bismuth pump performance test circuit. A third heating element 5-5 and a fourth heating element 6-4 are located between the flow meter 6-3 and the third shut-off valve 5-3. The outlet of the flow meter 6-3 is connected to the fourth shut-off valve 6-1. The outlet of the fourth shut-off valve 6-1 is connected to the standardized test section 6. The outlet of the standardized test section is connected to the fifth shut-off valve 6-2. The outlet of the fifth shut-off valve 6-2 is connected to the sixth shut-off valve 6-5. The outlet of the sixth shut-off valve 6-5 is connected to the top of the storage tank 4. Heating wires can be used for the first heating element 3-6, the second heating element 4-6, the third heating element 5-5, and the fourth heating element 6-4 to ensure the circulating test temperature of the high-temperature liquid lead-bismuth. The standardized test section 6 is a pipe section connected to the lead-bismuth pump performance test circuit.

[0027] In this embodiment, the melting tank 3 is provided with a first heating ring 3-4 for heating and melting lead and bismuth, and a melting tank insulation layer 3-5 is provided between the melting tank 3 and the first heating ring 3-4. The storage tank 4 is provided with a second heating ring 4-4 ​​for maintaining the molten state of lead and bismuth, and a storage tank insulation layer 4-5 is provided between the storage tank 4 and the second heating ring 4-4. The melting tank insulation layer 3-5 is used to ensure that the temperature in the melting tank 3 is kept constant at a temperature sufficient to melt lead and bismuth, and the storage tank insulation layer 4-5 is used to ensure that the temperature of the high-temperature liquid lead and bismuth in the storage tank 4 is within the temperature range required for the performance test of the lead and bismuth pump.

[0028] When the storage tank 4 and the melting tank 3 change from room temperature to a high temperature, the expansion due to temperature rise will cause stress on the tank wall 8. When changing from a high temperature to room temperature, the contraction due to cooling will cause gaps between the tank wall 8 and the insulation layer, forming a thermal bridge effect. To avoid the above-mentioned adverse situations, as an embodiment, the insulation layer 4-5 of the storage tank and the insulation layer 3-5 of the melting tank can be adopted as follows: Figure 2 and Figure 3 The insulation structure shown below has the following layered structure from the inside out (from tank wall 8 outwards): First layer: Foundation fixing layer (connected to tank wall 8), which uses a metal anchoring mesh or base plate with regularly arrayed installation points pre-welded or bonded to the tank wall 8 to provide a solid and reliable installation foundation for the entire dynamic stress adjustment layer.

[0029] The second layer is a buffer layer, which includes an insulation pad 10, an elastic element 11, and a support guide 12. 1. Insulation pad 10: It is a cubic or cylindrical block. The size of the insulation pad 10 can be selected according to the actual tank size and cushioning requirements. It can be made of materials with both extremely low thermal conductivity and high resilience (such as flexible elastic foam, nanoporous aerogel felt, high resilience glass wool or rock wool blocks). It can provide the main insulation function, while its softness allows it to be compressed and rebound. 2. Elastic element 11: It is a miniature helical spring or disc spring assembly, which is located behind each insulation pad 10 (on the side away from the tank wall 8) and presses against the insulation pad 10 to provide the insulation pad 10 with a pre-tightening force pointing towards the tank wall 8.

[0030] 3. Support guide 12: It is connected to the base fixing layer with regularly arrayed installation points, and pressure plate 9, heat insulation pad 10, elastic element 11 and adjusting nut 15 are sequentially installed on the support guide 12. The adjusting nut 15 is threaded to the support guide 12. One side of the pressure plate 9 is close to the tank wall 8. The support guide 12 can be made of screw to prevent the heat insulation pad 10 from being misaligned or twisted under long-term vibration, and to provide guidance for the elastic element 11 to ensure that its extension and contraction direction does not deviate.

[0031] The third layer: outer sealing layer 13, which can be a tough and airtight flexible film, such as an aluminum-coated reinforced plastic composite film or a special rubber sheet, to wrap the entire core buffer layer to form a whole, which is easy to install and handle, and at the same time prevents moisture and dust from entering.

[0032] The insulation pad 10, the elastic element 11, and the support guide 12 together form a single buffer unit. Each buffer unit is distributed in a rectangular or regular array along the arc surface on the tank wall 8 to form a buffer layer. The elastic element 11 can not only provide axial (perpendicular to the tank wall 8) buffer, but also allow the insulation pad 10 to have slight lateral (tangential) movement to adapt to complex stress states. The gap between the buffer layer and the outer sealing layer 13 is filled with insulation material 14.

[0033] After the buffer layer is installed, the elastic element 11 is in a free state or only slightly compressed. Tighten the adjusting nut 15 on the support guide 12 to drive the elastic element 11 to move the insulation pad 10 and the pressure plate 9 toward the tank wall 8. When the pressure plate 9 contacts the tank wall 8, continue to tighten the adjusting nut 15 to force the pressure plate 9 and the insulation pad 10 to stop moving. The adjusting nut 15 will continue to move and compress the elastic element 11 toward the tank wall 8 until the elastic element 11 is compressed to the set compression amount, providing the insulation pad 10 with a preload pointing toward the tank wall 8.

[0034] When the tank shrinks due to cooling, the tank wall 8 moves away from the insulation layer. At this time, there is a tendency for a gap to appear between the pressure plate 9 and the tank wall 8. The elastic element 11 has a pre-tightening force pointing towards the tank wall 8. The elastic element 11 extends, pushes the insulation pad 10 and drives the pressure plate 9 to stick tightly to the tank wall 8, so as to avoid the formation of a gap and thermal bridge.

[0035] When the tank expands due to temperature rise, the tank wall 8 "squeezes" the pressure plate 9 and the insulation pad 10. At this time, the insulation pad 10 drives the elastic element 11 to compress it, absorbing the stress generated by the expansion of the tank wall 8, preventing the stress from being directly transmitted and causing damage.

[0036] In this embodiment, the melting tank 3 is equipped with a first lead-bismuth temperature sensor 3-1, a first heating coil temperature sensor 3-2, and a first liquid level sensor 3-3, while the storage tank 4 is equipped with a second lead-bismuth temperature sensor 4-1, a second heating coil temperature sensor 4-2, and a second liquid level sensor 4-3. The first lead-bismuth temperature sensor 3-1 is used to detect the temperature in the melting tank 3, the first heating coil temperature sensor 3-2 is used to detect the temperature of the first heating coil 3-4, and the first liquid level sensor 3-3 is used to detect the liquid level of the high-temperature liquid lead-bismuth in the melting tank 3. The actual liquid level limit can be determined based on the size of the melting tank 3, the total amount of high-temperature liquid lead-bismuth required for the experiment, and the flow rate of the protective gas circuit, to avoid excessive load on subsequent tests caused by excessive high-temperature liquid lead-bismuth.

[0037] In this embodiment, the spacing between the second heating element 4-6 and the third heating element 5-5 in the lead-bismuth supply circuit is the same as the spacing between the third heating element 5-5 and the fourth heating element 6-4 in the lead-bismuth supply circuit; the spacing between the first heating element 3-6 and the second heating element 4-6 in the lead-bismuth supply circuit is the same as the spacing between the second heating element 4-6 and the third heating element 5-5 in the lead-bismuth supply circuit. The setting of the same spacing can ensure that the temperature of the high-temperature liquid lead-bismuth in the lead-bismuth pump performance test circuit is always within the temperature range required for the lead-bismuth pump performance test. Specifically, the temperature range required for the test is 300℃~500℃. The actual length of the spacing only needs to ensure that the temperature of the high-temperature liquid lead-bismuth is between 300℃ and 500℃ when it flows between adjacent heating elements, which will not be elaborated here.

[0038] In this embodiment, a first heating element temperature sensor 3-7, a second heating element temperature sensor 4-7, a third heating element temperature sensor 5-5, and a fourth heating element temperature sensor 6-6 are correspondingly provided next to the four heating elements. The first heating element temperature sensor 3-7, the second heating element temperature sensor 4-7, the third heating element temperature sensor 5-5, and the fourth heating element temperature sensor 6-6 are used to monitor the heating temperature provided by the first heating element 3-6, the second heating element 4-6, the third heating element 5-5, and the fourth heating element 6-4 in real time. When the temperature exceeds or falls below the temperature range required for the performance test of the lead-bismuth pump, the operator can promptly detect and handle the emergency.

[0039] In this embodiment, the lead-bismuth pump 5 is equipped with an inlet pressure sensor 5-1 and an outlet pressure sensor 5-2 at its inlet and outlet, respectively. The lead-bismuth pump 5 is equipped with a torque and speed tester 5-8 and a third lead-bismuth temperature sensor 5-7 for detecting the temperature of the lead-bismuth pump 5. The lead-bismuth pump 5 is equipped with a lead-bismuth pump insulation layer 5-6 on the outside. The lead-bismuth pump performance test circuit is also equipped with a flow meter 6-3 for detecting the flow rate of molten lead-bismuth in the lead-bismuth supply circuit. The inlet pressure sensor 5-1 and the outlet pressure sensor 5-2 are used to detect the pressure value at the inlet and outlet of the lead-bismuth pump 5, respectively.

[0040] In this embodiment, the melting tank 3, the storage tank 4, and the lead-bismuth pump 5 are respectively provided with heat insulation layers. The heat insulation layers can reduce the heat exchange between the high-temperature liquid lead-bismuth in the storage tank 4, the lead-bismuth supply circuit, and the lead-bismuth pump performance test circuit and the outside environment, avoid exceeding or falling below the temperature range required for the lead-bismuth pump performance test, and also reduce the heating burden on the heating elements in the circuit.

[0041] In this embodiment, a control unit 7 is also included. Each sensor, exhaust valve, and shut-off valve are connected to the control unit 7. The control unit 7 can collect the parameters of each sensor in real time and control the opening or closing of the exhaust valve and shut-off valve to realize human-machine interaction of the device.

[0042] The testing process for this utility model is as follows: 1. Preparatory work before melting lead-bismuth alloy; Solid lead-bismuth alloy is placed into melting tank 3. The third exhaust valve 2-1, the fourth exhaust valve 2-2, and the shut-off valve on the lead-bismuth pump performance test circuit are fully opened. Vacuum pump 2 is started to remove air from melting tank 3, storage tank 4, and the lead-bismuth pump performance test circuit. Simultaneously, through… The third pressure sensor 2-3 on the first vacuum branch and the fourth pressure sensor 2-4 on the second vacuum branch monitor the pressure changes during the vacuuming process in real time. After the vacuuming is completed, the third exhaust valve 2-1 and the fourth exhaust valve 2-2 are closed, the main exhaust valve 1-1 connected to the outlet of gas source 1 is opened, and the first exhaust valve 1-2 on the first gas branch and the second exhaust valve 1-3 on the second gas branch are slowly opened to inject a small amount of positive pressure protective gas into the melting tank 3, the storage tank 4, and the lead-bismuth pump performance test circuit. After the small amount of positive pressure protective gas is injected, all exhaust valves and shut-off valves are closed, and the heating elements (i.e., the first heating element 3-6, the second heating element 4-6, the third heating element 5-5, and the fourth heating element 6-4) on the lead-bismuth pump performance test circuit and the lead-bismuth supply circuit are activated for preheating. The temperature changes are monitored in real time by the temperature sensors corresponding to the heating elements (i.e., the first heating element temperature sensor 3-7, the second heating element temperature sensor 4-7, the third heating element temperature sensor 5-5, and the fourth heating element temperature sensor 6-6).

[0043] 2. The lead-bismuth alloy is melted to form high-temperature liquid lead-bismuth and then transported to storage tank 4; The first heating coil 3-4 on the melting tank 3 is activated to heat the solid lead-bismuth alloy inside the melting tank 3. Simultaneously, the temperature sensors 3-2 on the first heating coil and 3-1 on the first lead-bismuth temperature of the melting tank 3 are used for real-time monitoring. When the first lead-bismuth temperature sensor 3-1 detects that the temperature inside the melting tank 3 has reached the melting point temperature of the solid lead-bismuth alloy, the first liquid level sensor 3-3 on the melting tank 3 is activated to monitor the level of the high-temperature liquid lead-bismuth inside the melting tank 3. When the first liquid level sensor 3-3 detects that the high-temperature liquid lead-bismuth inside the melting tank 3 has reached the specified liquid level, the first shut-off valve 3-8 is opened, allowing the high-temperature liquid lead-bismuth to flow naturally to the lead-bismuth supply return valve. During the process, gradually open the main exhaust valve 1-1 connected to the gas source 1 and the first exhaust valve 1-2 connected to the top of the melting tank 3. At the same time, activate the second liquid level sensor 4-3 on the storage tank 4 to inject high-pressure protective gas into the melting tank 3, and force the high-temperature liquid lead-bismuth into the storage tank 4 through the lead-bismuth supply circuit. Monitor the liquid level of the high-temperature liquid lead-bismuth in the storage tank 4 through the second liquid level sensor 4-3 on the storage tank 4. When the specified liquid level is reached, close the first shut-off valve 3-8 and the first exhaust valve 1-2, and slowly open the second exhaust valve 1-3 connected to the top of the storage tank 4 to inject micro-positive pressure protective gas into the storage tank 4 for protection.

[0044] 3. Performance testing of high-temperature liquid lead-bismuth pump; Fully open the second shut-off valve 4-8, the third shut-off valve 5-3, the fourth shut-off valve 6-1, the fifth shut-off valve 6-2, and the sixth shut-off valve 6-5. Increase the opening of the second exhaust valve 1-3 to increase the pressure of the protective gas injected into the storage tank 4. This forces the high-temperature liquid lead-bismuth in the storage tank 4 to the inlet of the lead-bismuth pump 5 and starts the pump before it reaches the inlet. Adjust the opening of the second shut-off valve 4-8 at the inlet of the lead-bismuth pump 5 to conduct performance tests of the pump under different flow conditions. Monitor the temperature of the lead-bismuth pump 5 using the third lead-bismuth temperature sensor 5-7. Detect the pressure values ​​at the inlet and outlet of the lead-bismuth pump 5 using the inlet pressure sensor 5-1 and the outlet pressure sensor 5-2. Detect the flow rate of the lead-bismuth pump 5 using the flow meter 6-3 in the performance test circuit. The torque and speed tester 5-8 on the lead-bismuth pump 5 is used to measure the shaft power of the lead-bismuth pump 5 (by multiplying the obtained torque and speed parameters). The parameters obtained by the torque and speed tester 5-8 and each sensor are collected by the control unit 7. After the test, the second stop valve 4-8, the third stop valve 5-3, the fourth stop valve 6-1 and the fifth stop valve 6-2 are closed to shut down the lead-bismuth pump 5. The data obtained by adjusting the opening of the second stop valve 4-8 to conduct performance tests of the lead-bismuth pump under different flow conditions are combined with formulas (1), (2) and (3) to obtain the head and efficiency of the lead-bismuth pump 5 under different flow conditions, as well as the flow velocity of the high-temperature liquid lead-bismuth in the standardized test section 6. Finally, the performance curve of the lead-bismuth pump 5 is obtained.

[0045] (1) Where H is the head (m) of the lead-bismuth pump. This represents the pump outlet pressure (Pa). This refers to the pump inlet pressure (Pa). The density of liquid lead-bismuth at high temperature ( g is the acceleration due to gravity ( ).

[0046] (2) in The pump efficiency (%) of the lead-bismuth pump is given by Q, and the flow rate measured by the flow meter is given by Q. M is the impeller torque of the lead-bismuth pump. ), The angular velocity of the pump impeller ( ), M and Multiplying these values ​​yields the shaft power of the lead-bismuth pump.

[0047] (3) in The flow velocity within the standardized test section ( A is the cross-sectional area of ​​the standardized test section. .

[0048] 4. Recovering high-temperature liquid lead and bismuth; After all tests and trials are completed, all shut-off valves on the lead-bismuth pump performance test circuit and the lead-bismuth supply circuit are fully opened. The main exhaust valve 1-1 and the first exhaust valve 1-2 are opened, and the high-temperature liquid lead-bismuth in the lead-bismuth pump performance test circuit and the lead-bismuth supply circuit is purged and forced into storage tank 4 by high-pressure protective gas. Then, the shut-off valves located on the lead-bismuth pump performance test circuit (second shut-off valve 4-8, third shut-off valve 5-3, fourth shut-off valve 6-1, fifth shut-off valve 6-2, and sixth shut-off valve 6-5) are closed. The first shut-off valve 3-8, located between storage tank 4 and melting tank 3, remains fully open. At this time, the first exhaust valve 1-2 is closed, and the second exhaust valve 1-3, which connects to the top of storage tank 4, is opened. High-pressure protective gas is delivered from the top of storage tank 4 to storage tank 4, forcing the high-temperature liquid lead-bismuth in storage tank 4 from the bottom of storage tank 4 along the lead-bismuth supply circuit. In melting tank 3, after all the high-temperature liquid lead and bismuth is pressed into melting tank 3, the first shut-off valve 3-8 and the second exhaust valve 1-3 are closed, the third exhaust valve 2-1 on the first vacuum branch and the fourth exhaust valve 2-2 on the second vacuum branch are opened, and the shut-off valves (second shut-off valve 4-8, third shut-off valve 5-3, fourth shut-off valve 6-1, fifth shut-off valve 6-2 and sixth shut-off valve 6-5) located on the lead-bismuth pump performance test circuit are opened. Vacuum pump 2 is started to evacuate storage tank 4 and lead-bismuth pump performance test circuit. Pressure changes are monitored by the third pressure sensor 2-3 on the first vacuum branch and the fourth pressure sensor 2-4 on the second vacuum branch. After the gas is evacuated, all exhaust valves and shut-off valves are closed, and the heating elements (first heating element 3-6, second heating element 4-6, third heating element 5-5 and fourth heating element 6-4) are stopped.

[0049] The above descriptions are merely embodiments of the present invention, and common knowledge such as specific technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solutions of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A performance testing device for a closed-loop pressurized gas circuit high-temperature lead-bismuth pump, characterized in that: This includes a melting tank, a storage tank, a lead-bismuth pump, a protective gas circuit, a vacuum circuit, a lead-bismuth supply circuit, and a lead-bismuth pump performance testing circuit; Protective gas circuit: includes a gas source and a protective gas pipeline. The protective gas pipeline is equipped with a main exhaust valve at the gas source outlet. The main exhaust valve is connected to a first gas branch and a second gas branch. The first gas branch is connected to the top of the melting tank through the first exhaust valve, and the second gas branch is connected to the top of the storage tank through the second exhaust valve. Vacuum circuit: includes a vacuum pump, which is connected to a first vacuum branch and a second vacuum branch. The first vacuum branch is connected to the top of the melting tank through a third exhaust valve, and the second vacuum branch is connected to the top of the storage tank through a fourth exhaust valve. Lead-bismuth supply circuit: The bottom of the melting tank is connected to a supply pipeline and is connected to the bottom of the storage tank in sequence through the first heating element, the first shut-off valve and the second heating element; The lead-bismuth pump performance test circuit consists of a second shut-off valve connected between the first shut-off valve and the second heating element. The second shut-off valve is connected to the lead-bismuth pump. The outlet of the lead-bismuth pump is connected to the third shut-off valve. The outlet of the third shut-off valve is connected to the flow meter of the lead-bismuth pump performance test circuit. A third heating element and a fourth heating element are provided between the flow meter and the third shut-off valve. The outlet of the flow meter is connected to the fourth shut-off valve. The outlet of the fourth shut-off valve is connected to a standardized test section. The outlet of the standardized test section is connected to the fifth shut-off valve. The outlet of the fifth shut-off valve is connected to the sixth shut-off valve. The outlet of the sixth shut-off valve is connected to the top of the storage tank.

2. The performance testing device for a closed-loop pressurized gas circuit high-temperature lead-bismuth pump according to claim 1, characterized in that: The melting tank is equipped with a first heating ring for heating and melting lead and bismuth, and a melting tank insulation layer is provided between the melting tank and the first heating ring. The storage tank is equipped with a second heating ring for maintaining the molten state of lead and bismuth, and a storage tank insulation layer is provided between the storage tank and the second heating ring.

3. The performance testing device for a closed-loop pressurized gas circuit high-temperature lead-bismuth pump according to claim 2, characterized in that: The melting tank is equipped with a first lead-bismuth temperature sensor, a first heating coil temperature sensor, and a first liquid level sensor, while the storage tank is equipped with a second lead-bismuth temperature sensor, a second heating coil temperature sensor, and a second liquid level sensor.

4. The performance testing device for a closed-loop pressurized gas circuit high-temperature lead-bismuth pump according to claim 1, characterized in that: The spacing between the second and third heating elements in the lead-bismuth supply circuit is the same as the spacing between the third and fourth heating elements in the lead-bismuth supply circuit.

5. The performance testing device for a closed-loop pressurized gas circuit high-temperature lead-bismuth pump according to claim 4, characterized in that: The spacing between the first and second heating elements in the lead-bismuth supply circuit is the same as the spacing between the second and third heating elements in the lead-bismuth supply circuit.

6. The performance testing device for a closed-loop pressurized gas circuit high-temperature lead-bismuth pump according to claim 1, characterized in that: A first heating element temperature sensor, a second heating element temperature sensor, a third heating element temperature sensor, and a fourth heating element temperature sensor are respectively provided next to the four heating elements.

7. The performance testing device for a closed-loop pressurized gas circuit high-temperature lead-bismuth pump according to claim 1, characterized in that: The lead-bismuth pump is equipped with an inlet pressure sensor and an outlet pressure sensor, respectively. The lead-bismuth pump is equipped with a torque and speed tester and a third lead-bismuth temperature sensor for detecting the temperature of the lead-bismuth pump. The lead-bismuth pump is equipped with a lead-bismuth pump insulation layer on the outside.

8. The performance testing device for a closed-loop pressurized gas circuit high-temperature lead-bismuth pump according to claim 1, characterized in that: The lead-bismuth pump performance test circuit is also equipped with a flow meter to detect the flow rate of molten lead-bismuth in the lead-bismuth supply circuit.

9. The performance testing device for a closed-loop pressurized gas circuit high-temperature lead-bismuth pump according to claim 1, characterized in that: The protective gas circuit, vacuum circuit, lead-bismuth supply circuit, and lead-bismuth pump performance test circuit are all covered with an insulation layer.

10. A performance testing device for a closed-loop pressurized gas circuit high-temperature lead-bismuth pump according to any one of claims 1-9, characterized in that: It also includes a control unit, to which all sensors, exhaust valves, and shut-off valves are connected.

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