Supercritical carbon dioxide natural circulation experimental device and experimental method under swinging condition

Abstract

The invention discloses a supercritical carbon dioxide natural circulation experimental device and experimental method under a swing condition, and belongs to the field of new working medium nuclear energy system experiments, and the supercritical carbon dioxide natural circulation experimental device comprises a swing simulation platform, a natural circulation loop arranged on the swing simulation platform and a monitoring mechanism, the natural circulation loop comprises an ascending section, a first horizontal section, a descending section and a second horizontal section which are communicated in sequence, a preheating assembly and a heating assembly which are communicated in sequence are arranged on the ascending section, the inlet end of the preheating assembly is further communicated with the vacuumizing mechanism and the carbon dioxide supply mechanism, and a cooling assembly is arranged on the first horizontal section. By adopting the supercritical carbon dioxide natural circulation experimental device and experimental method under the swinging condition, the operation characteristic research on supercritical carbon dioxide natural circulation under the unsteady state motion of the ship and the ocean condition can be carried out, so that the internal influence mechanism of the swinging condition on a natural circulation system can be researched subsequently.

Description

Technical Field

[0001] The invention relates to the technical field of new working fluid nuclear energy system experiments, and in particular to a supercritical carbon dioxide natural circulation experimental device and an experimental method under swinging conditions. Background Art

[0002] The proposal of supercritical carbon dioxide reactor system originates from the technological innovation of the fourth generation nuclear reactor and the application demand of micro modular power system. 2 ) The Brayton cycle gas-cooled reactor has the advantages of high cycle efficiency, small equipment size, compact system structure, and high inherent safety, thus meeting the special application requirements of miniaturization and miniaturization of system equipment, and has good application prospects in ship nuclear power plants.

[0003] Natural circulation refers to a flow circulation in a closed loop that is achieved by the driving pressure head generated by the density difference of the fluid in the hot section and the cold section. When the reactor is shut down, it can discharge the residual heat of the core without relying on human operation and external energy supply, thereby improving the inherent safety of the reactor. Since the density of carbon dioxide changes dramatically near the quasi-critical point, the huge density difference generated by carbon dioxide when it crosses the critical point can generate a large gravity pressure difference between the hot and cold pipes of the loop, thereby achieving S-CO in the loop without external work. 2 Natural cycle.

[0004] In the marine environment, the nuclear power plant of the ship will inevitably be affected by wind and waves, causing the hull to tilt, sway, and move along three axes in six degrees of freedom. The transient external force field caused by the marine environment will produce additional inertial force on the coolant, and S-CO 2 There are phenomena such as flow acceleration and buoyancy, which makes the flow and heat transfer characteristics of the coolant in the natural circulation loop more complicated. However, the existing technology lacks the ability to detect S-CO under swinging conditions. 2 The study of the laws of natural circulation. Summary of the invention

[0005] The purpose of the present invention is to provide a supercritical carbon dioxide natural circulation experimental device and an experimental method under swinging conditions to solve the above technical problems.

[0006] To achieve the above-mentioned purpose, the present invention provides a supercritical carbon dioxide natural circulation experimental device under swinging conditions, comprising a swinging simulation platform, a natural circulation loop arranged on the swinging simulation platform, and a monitoring mechanism, the natural circulation loop comprising an ascending section, a first horizontal section, a descending section and a second horizontal section connected in sequence, wherein the ascending section is provided with a preheating component and a heating component connected in sequence, the inlet end of the preheating component is also respectively connected to a vacuum pumping mechanism and a carbon dioxide supply mechanism, and a cooling component is provided on the first horizontal section.

[0007] Preferably, the preheating component is a preheater;

[0008] The heating assembly includes a heating section connected to the output end of the preheater, a heating electrode arranged outside the heating section, and a DC power supply electrically connected to the heating electrode;

[0009] Insulating flanges are provided at both ends of the heating section, and the outer side of the heating section is wrapped with aluminum silicate ceramic fiber insulation blanket and insulation rock wool in sequence.

[0010] Preferably, the cooling assembly includes a shell-and-tube heat exchanger and a cooling water tower arranged on the first horizontal section, the hot fluid inlet of the shell-and-tube heat exchanger is connected to the output end of the heating section, the hot fluid outlet of the shell-and-tube heat exchanger is connected to the input end of the descending section, the cold fluid inlet of the shell-and-tube heat exchanger is connected to the outlet of the cooling water tower, and the cold fluid outlet of the shell-and-tube heat exchanger is connected to the return water inlet of the cooling water tower.

[0011] Preferably, the vacuuming mechanism comprises a vacuum pump connected to the input end of the preheater;

[0012] The carbon dioxide supply mechanism includes a booster pump and a gas storage bottle which are connected to the input end of the preheater in sequence. The gas storage bottle is a vertical cylinder structure with a pressure bearing capacity of 10MPa and a capacity of 2m 3 .

[0013] Preferably, the input end of the preheater is also connected to a voltage stabilizing mechanism, which includes a voltage stabilizing tank whose input end is connected to the input end of the preheater, and a safety valve is connected to the output end of the voltage stabilizing tank, and the safety valve and the voltage stabilizing tank are connected to the nitrogen bottle via a regulating valve.

[0014] Preferably, the monitoring mechanism includes pressure gauges respectively arranged at the input end and output end of the preheater and the output end of the heating section, thermocouples arranged at the input end, output end and heating section of the heating section and the input end of the shell-and-tube heat exchanger, and a mass flow meter arranged at the second horizontal section and the heating section, and the pressure gauge, thermocouple and mass flow meter are all connected to the host computer;

[0015] A plurality of thermocouples are arranged at equal intervals outside the heating section. The thermocouples are T-type thermocouples. The T-type thermocouples are vertically inserted into the heating section input end pipeline, the heating section output end pipeline, the heating section or the inner part of the shell-and-tube heat exchanger input end pipeline through a three-way joint and are in contact with the carbon dioxide flowing inside.

[0016] Preferably, the swing simulation platform includes a swing table, a base arranged below the swing table, and a swing mechanism arranged between the swing table and the base, the swing mechanism includes a rotating shaft arranged vertically at the top of the base, a swing drive assembly fixedly connected to one end of the rotating shaft, and a support rod fixedly connected to the circumferential side of the rotating shaft, one end of the support rod away from the rotating shaft is fixedly connected to the bottom end of the swing table, and a natural circulation loop is arranged at the top of the swing table.

[0017] Preferably, the rocking mechanism includes a rocker with one end eccentrically connected to the end of the rotating shaft, and a reducer and a drive motor which are in turn connected to the other end of the rocker, and the drive motor is electrically connected to the frequency converter.

[0018] The method of the supercritical carbon dioxide natural circulation experimental device under swinging conditions comprises the following steps:

[0019] S1. Preparation before the experiment: Use deionized water to clean the natural circulation loop, then conduct a pressure test to check the sealing, calibrate the monitoring mechanism, and then open the nitrogen bottle to fill the natural circulation loop with nitrogen for drying;

[0020] S2. Turn on the vacuum pump to extract the impurity gas in the natural circulation loop;

[0021] S3, turn on the booster pump and the pressure regulator, inject carbon dioxide into the natural circulation loop, and open the regulating valve until the pressure measured by the pressure gauge reaches the target operating pressure;

[0022] S4, turning on the preheater, the heating component and the cooling component to perform stage temperature adjustment until the set temperature range is reached. At this time, the carbon dioxide is heated and rises under the heating of the preheater and the heating component, and flows to the descending section after being cooled by the cooling component, generating a density difference, thereby realizing natural circulation;

[0023] S5. Turn on the drive motor, and use the reciprocating motion of the drive motor to drive the shaft to reciprocate through the reducer and the rocker, thereby driving the rocking platform to rock to simulate ocean conditions, and use the monitoring mechanism to monitor during this process.

[0024] Preferably, in step S4, the temperature rise amplitude of each stage is less than 15°C, and when the temperature change between the heating section wall and the natural circulation loop collected by the thermocouple in the current stage is less than the set value, the next stage is entered;

[0025] In step S5, the swing angle of the swing stage is 5°-30°, and the period is 5s-40s.

[0026] Therefore, the present invention adopts the above-mentioned supercritical carbon dioxide natural circulation experimental device and method under swinging conditions, which has the following beneficial effects:

[0027] 1. Highly simulate the actual marine environment: through the swing mechanism composed of the driving motor, reducer and rocker, the reciprocating swing of the swing table can be realized, simulating the six degrees of freedom movement of the ship in the ocean, such as tilting and swinging;

[0028] 2. Multi-point monitoring: Pressure gauges, thermocouples and mass flow meters are set at key locations of the preheater, heating section and cooling components to monitor the pressure, temperature and flow changes in the system in real time, and transmit the data to the host computer for recording and analysis, which helps researchers to fully understand the operating status of the system and conduct detailed analysis;

[0029] 3. Multiple safety guarantees: In addition to the pressure-stabilizing tank and safety valve, the entire system has also undergone pressure resistance tests and sealing inspections to ensure safety under high pressure and high temperature conditions; in addition, the natural circulation loop is cleaned with deionized water and filled with nitrogen for drying, which further improves the reliability and safety of the system;

[0030] 4. Temperature and pressure control: The temperature rise in each stage is less than 15°C, and the next stage is entered when the temperature change collected by the thermocouple is less than the set value, ensuring the precision and stability of temperature regulation;

[0031] 5. The swing frequency and swing amplitude can be controlled by driving motor, inverter and reducer to simulate different dynamic ocean swing conditions.

[0032] In summary, the present invention can simultaneously cover high temperature and high pressure conditions in the experimental range, and accurately conduct in-depth research on the natural circulation characteristics of supercritical carbon dioxide under swinging conditions, thereby providing important experimental support for improving the safety and reliability of ship nuclear power plants.

[0033] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of a supercritical carbon dioxide natural circulation experimental device under swinging conditions according to the present invention;

[0035] Figure 2 This is a schematic diagram of the structure of the swing mechanism of the present invention;

[0036] Figure 3 This is a diagram showing the arrangement of the thermocouples described in the present invention on the heating section.

[0037] Reference numerals

[0038] 1. Gas cylinder; 2. Booster pump; 3. Vacuum pump; 4. Pressure gauge; 5. Preheater; 6. Pressure regulator tank; 7. Nitrogen cylinder; 8. Thermocouple; 9. Heating section; 10. Shell and tube heat exchanger; 11. Safety valve; 12. Cooling water tower; 13. Mass flow meter; 14. Swing table; 15. Rotating shaft; 16. Support rod; 17. Base; 18. Control valve; 19. Descending section; 20. DC power supply; 21. Drive motor; 22. Frequency converter; 23. Reducer; 24. Rocker. DETAILED DESCRIPTION

[0039] In the description of the present invention, it should be noted that the terms "upper", "lower", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the invented product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In the description of the present invention, it should also be noted that, unless otherwise clearly specified and limited, the terms "setting", "installation", and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] The embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0041] The experimental study is to master the S-CO under the swing condition 2 An effective means of natural circulation law is helpful to study S-CO under different motion states 2 The characteristics of natural circulation system and convection heat transfer characteristics, explore the instability mechanism of natural circulation flow, clarify the complex coupling relationship between transient external force field and internal force field, support the development of related safety technology, and provide a reference for S-CO 2 The natural circulation system helps the nuclear power plants on offshore platforms or ships to operate reliably.

[0042] Based on the above analysis, the present invention is designed as follows: Figure 1-Figure 3 As shown, a supercritical carbon dioxide natural circulation experimental device under swinging conditions includes a swinging simulation platform, a natural circulation loop arranged on the swinging simulation platform, and a monitoring mechanism, the natural circulation loop includes an ascending section, a first horizontal section, a descending section 19 and a second horizontal section connected in sequence, wherein the ascending section is provided with a preheating component and a heating component connected in sequence, the inlet end of the preheating component is also connected to the vacuum pumping mechanism and the carbon dioxide supply mechanism respectively, and the first horizontal section is provided with a cooling component.

[0043] Among them, the preheating component is a preheater 5; the heating component includes a heating section 9 connected to the output end of the preheater 5, a heating electrode arranged outside the heating section 9 and a DC power supply 20 electrically connected to the heating electrode, the DC power supply 20 is placed on the ground, and the heating electrode is a copper electrode; both ends of the heating section 9 are provided with insulating flanges, that is, both ends of the heating section 9 are connected to other pipelines through insulating flanges, and at the same time, the bolts and nuts of the insulating flanges are electrically insulated, and the outer side of the heating section 9 is wrapped with aluminum silicate ceramic fiber insulation blanket and insulating rock wool in sequence.

[0044] The cooling assembly includes a shell and tube heat exchanger 10 and a cooling water tower 12 arranged on the first horizontal section. The hot fluid inlet of the shell and tube heat exchanger 10 is connected to the output end of the heating section 9, the hot fluid outlet of the shell and tube heat exchanger 10 is connected to the input end of the descending section 19, the cold fluid inlet of the shell and tube heat exchanger 10 is connected to the outlet of the cooling water tower 12, and the cold fluid outlet of the shell and tube heat exchanger 10 is connected to the return water inlet of the cooling water tower 12.

[0045] The vacuum pumping mechanism includes a vacuum pump 3 connected to the input end of the preheater 5; the carbon dioxide supply mechanism includes a booster pump 2 and a gas cylinder 1 connected to the input end of the preheater 5 in sequence. The gas cylinder 1 is a vertical cylinder structure. The pressure of the gas cylinder 1 is 10MPa and the capacity is 2m 3 .

[0046] The input end of the preheater 5 is also connected to a pressure stabilizing mechanism, which includes a pressure stabilizing tank 6 whose input end is connected to the input end of the preheater 5, and a safety valve 11 is connected to the output end of the pressure stabilizing tank 6. The safety valve 11 is connected to the pressure stabilizing tank 6 and the nitrogen bottle 7 via a regulating valve 18. The function of the regulating valve 18 is to release excess gas when the pressure of the natural circulation loop exceeds the set value to ensure that the working pressure in the pipeline remains within a predetermined range. The safety valve 11 acts as a safety guarantee. When the pressure in the natural circulation loop rises to exceed the safety threshold, the pressure is automatically released to protect the safety of the entire experimental facility.

[0047] The monitoring mechanism includes a pressure gauge 4 respectively arranged at the input end and output end of the preheater 5 and the output end of the heating section 9, a thermocouple 8 arranged at the input end, output end and heating section 9 of the heating section 9 and the input end of the shell and tube heat exchanger 10, and a mass flow meter 13 arranged on the second horizontal section and the heating section 9. The pressure gauge 4, the thermocouple 8 and the mass flow meter 13 are all connected to the host computer. The host computer of this embodiment is equipped with a data acquisition system to read, display and record data. In this embodiment, the temperature signal acquisition frequency is not less than 100S / s, and the other signal acquisition frequencies are not less than 600S / s;

[0048] In this embodiment, the pressure gauge 4 is connected to the natural circulation loop via a straight pipe to reduce the potential impact of pipe wall flow disturbance on the pressure reading.

[0049] A plurality of thermocouples 8 are arranged at equal intervals outside the heating section 9. In the present embodiment, a thermocouple 8 is arranged every 100 mm outside the heating section 9 to monitor the wall temperature of the heating section 9 and the temperature of the fluid in the tube. The thermocouple 8 is a T-type thermocouple 8. The T-type thermocouple 8 is vertically inserted into the input end pipeline of the heating section 9, the output end pipeline of the heating section 9, the heating section 9 or the input end pipeline of the shell-and-tube heat exchanger 10 through a three-way joint (the insertion depth of the T-type thermocouple 8 is designed to be 2 / 3 of the diameter of the pipeline) and contacts with the carbon dioxide flowing inside.

[0050] The swing simulation platform includes a swing table 14, a base 17 arranged below the swing table 14, and a swing mechanism arranged between the swing table 14 and the base 17. The swing mechanism includes a rotating shaft 15 arranged vertically at the top of the base 17, a swing driving assembly fixedly connected to one end of the rotating shaft 15, and a support rod 16 fixedly connected to the circumferential side of the rotating shaft 15. One end of the support rod 16 away from the rotating shaft 15 is fixedly connected to the bottom end of the swing table 14, and a natural circulation loop is arranged at the top of the swing table 14.

[0051] The swing mechanism includes a rocker 24 having one end eccentrically connected to the end of the rotating shaft 15, and a reducer 23 and a drive motor 21 which are in turn connected to the other end of the rocker 24. The drive motor 21 is electrically connected to the frequency converter 22. The frequency converter 22 can be used to control the reciprocating rotation of the drive motor 21, thereby driving the rotating shaft 15 to swing through the reduction motor and the rocker 24, and driving the swing platform 14 to swing back and forth, thereby achieving adjustable swing frequency and amplitude.

[0052] The method of the supercritical carbon dioxide natural circulation experimental device under swinging conditions comprises the following steps:

[0053] S1. Preparation before the experiment: Use deionized water to clean the natural circulation loop, then perform a pressure test to check the sealing, and calibrate the monitoring mechanism to avoid zero drift error, then open the nitrogen bottle 7 to fill the natural circulation loop with nitrogen for drying;

[0054] S2, turn on the vacuum pump 3 to extract the impurity gas in the natural circulation loop;

[0055] S3, turn on the booster pump 2 and the pressure regulator, inject carbon dioxide into the natural circulation loop, and open the regulating valve 18 until the pressure collected by the pressure gauge 4 reaches the target operating pressure. The target operating pressure of this embodiment is 6.0 MPa-9.0 MPa;

[0056] S4, turn on the preheater 5, the heating component and the cooling component to perform stage temperature adjustment until the set temperature range. The temperature conditions of this embodiment are that the inlet temperature of the heating section 9 is 30°C-100°C and the heating power is 10kW-30kW. At this time, the carbon dioxide is heated and rises under the heating of the preheater 5 and the heating component, and flows to the descending section 19 after being cooled by the cooling component, generating a density difference, thereby realizing natural circulation;

[0057] In step S4, the temperature rise amplitude of each stage is less than 15°C, and when the temperature change between the wall of the heating section 9 and the natural circulation loop collected by the thermocouple 8 in the current stage is less than the set value, the next stage is entered;

[0058] S5. Turn on the drive motor 21, and use the reciprocating motion of the drive motor 21 to drive the shaft 15 to reciprocate through the reducer 23 and the rocker 24, thereby driving the rocking platform 14 to rock, so as to simulate ocean conditions, and use the monitoring mechanism to monitor during this process.

[0059] In step S5, the swing angle of the swing stage 14 is 5°-30°, and the period is 5s-40s.

[0060] During the experiment, a natural circulation loop experiment in which the swing table 14 is in a stationary state can be set up as a comparative experiment, so as to explore the natural circulation characteristics of supercritical carbon dioxide in land-based nuclear energy systems.

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the present invention.

Claims

1. A supercritical carbon dioxide natural circulation experimental device under swinging conditions, characterized in that: It includes a swing simulation platform, a natural circulation loop arranged on the swing simulation platform, and a monitoring mechanism. The natural circulation loop includes an ascending section, a first horizontal section, a descending section, and a second horizontal section that are connected in sequence. The ascending section is provided with a preheating component and a heating component that are connected in sequence. The inlet end of the preheating component is also connected to a vacuum pumping mechanism and a carbon dioxide supply mechanism, respectively. A cooling component is provided on the first horizontal section.

2. The supercritical carbon dioxide natural circulation experimental device under swinging conditions according to claim 1, characterized in that: The preheating component is a preheater; The heating assembly includes a heating section connected to the output end of the preheater, a heating electrode arranged outside the heating section, and a DC power supply electrically connected to the heating electrode; Insulating flanges are provided at both ends of the heating section, and the outer side of the heating section is wrapped with an aluminum silicate ceramic fiber insulation blanket and insulation rock wool in sequence.

3. The supercritical carbon dioxide natural circulation experimental device under swinging conditions according to claim 2, characterized in that: The cooling component includes a shell and tube heat exchanger and a cooling water tower arranged on the first horizontal section, the hot fluid inlet of the shell and tube heat exchanger is connected to the output end of the heating section, the hot fluid outlet of the shell and tube heat exchanger is connected to the input end of the descending section, the cold fluid inlet of the shell and tube heat exchanger is connected to the outlet of the cooling water tower, and the cold fluid outlet of the shell and tube heat exchanger is connected to the return water inlet of the cooling water tower.

4. The supercritical carbon dioxide natural circulation experimental device under swinging conditions according to claim 3 is characterized in that: The vacuum pumping mechanism includes a vacuum pump connected to the input end of the preheater; The carbon dioxide supply mechanism includes a booster pump and a gas storage bottle which are connected to the input end of the preheater in sequence. The gas storage bottle is a vertical cylinder structure with a pressure bearing capacity of 10MPa and a capacity of 2m 3 .

5. The supercritical carbon dioxide natural circulation experimental device under swinging conditions according to claim 4, characterized in that: The input end of the preheater is also connected to a voltage stabilizing mechanism, which includes a voltage stabilizing tank whose input end is connected to the input end of the preheater, and a safety valve is connected to the output end of the voltage stabilizing tank, and the safety valve and the voltage stabilizing tank are connected to the nitrogen bottle via a regulating valve.

6. The supercritical carbon dioxide natural circulation experimental device under swinging conditions according to claim 5, characterized in that: The monitoring mechanism includes pressure gauges respectively arranged at the input end and output end of the preheater and the output end of the heating section, thermocouples arranged at the input end, output end and heating section of the heating section and the input end of the shell-and-tube heat exchanger, and mass flow meters arranged at the second horizontal section and the heating section. The pressure gauge, thermocouple and mass flow meter are all connected to the host computer; A plurality of thermocouples are arranged at equal intervals outside the heating section. The thermocouples are T-type thermocouples. The T-type thermocouples are vertically inserted into the heating section input end pipeline, the heating section output end pipeline, the heating section or the inner part of the shell-and-tube heat exchanger input end pipeline through a three-way joint and are in contact with the carbon dioxide flowing inside.

7. The supercritical carbon dioxide natural circulation experimental device under swinging conditions according to claim 6, characterized in that: The swing simulation platform includes a swing table, a base arranged below the swing table, and a swing mechanism arranged between the swing table and the base. The swing mechanism includes a rotating shaft arranged vertically on the top of the base, a swing driving assembly fixedly connected to one end of the rotating shaft, and a support rod fixedly connected to the circumferential side of the rotating shaft. One end of the support rod away from the rotating shaft is fixedly connected to the bottom end of the swing table, and a natural circulation loop is arranged at the top of the swing table.

8. The supercritical carbon dioxide natural circulation experimental device under swinging conditions according to claim 7, characterized in that: The swing mechanism comprises a rocker with one end eccentrically connected to the end of the rotating shaft, and a reducer and a drive motor which are sequentially connected to the other end of the rocker, and the drive motor is electrically connected to the frequency converter.

9. The method of the supercritical carbon dioxide natural circulation experimental device under swinging conditions as claimed in claim 8, characterized in that: The following steps are involved: S1. Preparation before the experiment: Use deionized water to clean the natural circulation loop, then conduct a pressure test to check the sealing, calibrate the monitoring mechanism, and then open the nitrogen bottle to fill the natural circulation loop with nitrogen for drying; S2. Turn on the vacuum pump to extract the impurity gas in the natural circulation loop; S3, turn on the booster pump and the pressure-stabilizing tank, inject carbon dioxide into the natural circulation loop, and open the regulating valve until the pressure measured by the pressure gauge reaches the target operating pressure; S4, turning on the preheater, the heating component and the cooling component to perform stage temperature adjustment until the set temperature range is reached. At this time, the carbon dioxide is heated and rises under the heating of the preheater and the heating component, and flows to the descending section after being cooled by the cooling component, generating a density difference, thereby realizing natural circulation; S5. Turn on the drive motor, and use the reciprocating motion of the drive motor to drive the shaft to reciprocate through the reducer and the rocker, thereby driving the rocking platform to rock to simulate ocean conditions, and use the monitoring mechanism to monitor during this process.

10. The experimental method of the supercritical carbon dioxide natural circulation experimental device under swinging conditions according to claim 9, characterized in that: In step S4, the temperature rise amplitude of each stage is less than 15°C, and when the temperature change between the heating section wall and the natural circulation loop collected by the thermocouple in the current stage is less than the set value, the next stage is entered; In step S5, the swing angle of the swing stage is 5°-30°, and the period is 5s-40s.

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