Supercritical carbon dioxide continuous flow corrosion test system and test method

Abstract

The invention relates to a supercritical carbon dioxide continuous flow corrosion test system and test method, the test system comprises a gas supply system and a closed test system loop, the test system loop comprises: a circulating pump (5) for providing boosting and flow power for the circulation of liquid carbon dioxide in the test system loop; the flow meter (6) is used for measuring the flow velocity of the liquid carbon dioxide; a heater (7) for phase-changing liquid carbon dioxide into carbon dioxide gas; the test section (8) is constructed into a place for storage and continuous corrosion test of a sample piece to be tested; the heat regenerator (9) is connected with the test section (8) and is configured to exchange heat with the tested carbon dioxide gas; the condenser (11) is configured to condense the carbon dioxide gas after heat exchange; and one end of the circulating tank (4) is connected with the air supply system and the condenser (11), the other end of the circulating tank (4) is connected with the circulating pump (5), and the circulating tank (4) is constructed to provide liquid carbon dioxide for the test system loop, recover the liquid carbon dioxide and form a closed test system loop.

Description

Supercritical carbon dioxide continuous flow corrosion test system and test method Technical Field

[0001] The present application belongs to the technical field of metal material corrosion and protection, and in particular relates to a supercritical carbon dioxide continuous flow corrosion testing system and testing method. Background Art

[0002] Supercritical carbon dioxide is a dense fluid that combines the properties of both gas and liquid. It features low viscosity, high fluidity, minimal system circulation losses, high density, high heat transfer efficiency, and strong work capacity. Research has shown that when supercritical carbon dioxide pressure reaches 20 MPa and temperature reaches 550°C, the efficiency of converting thermal energy into output electrical energy in power generation systems generally exceeds 45%. This compares to the efficiency of Rankine cycles using water as the circulating working fluid, which is generally less than 40%. For example, when steam working fluid parameters are 6-7 MPa pressure and 275-285°C temperature, the cycle efficiency of nuclear power units is 33%. Therefore, the application of supercritical carbon dioxide Brayton cycles in next-generation nuclear power, solar power generation, gas turbines, and other forms of power generation systems has enormous potential.

[0003] Unlike high-temperature steam environments, heat-resistant materials undergo simultaneous oxidation and carburization in supercritical CO2 environments. Carburization not only reduces the adhesion between the surface oxide layer and the substrate, but also significantly decreases the outdiffusion efficiency of Cr ions and limits the film formation rate of the Cr2O3 layer, significantly reducing the corrosion resistance of the heat-resistant materials. Currently, research has been conducted on the high-temperature corrosion resistance, carburization resistance, and mechanical properties of ferritic, austenitic, and nickel-based superalloys and surface-modified heat-resistant materials in supercritical CO2 environments. However, due to the high flow rate, high temperature, and high pressure in supercritical environments, flow-accelerated corrosion (FACC) testing of key nuclear energy system materials under high-temperature, high-pressure, and supercritical CO2 conditions is required. The results of this research will provide a strong guarantee for the overall operational safety and reliability of nuclear power systems. Due to the high permeability of supercritical CO2 working fluid parameters, stable operation of supercritical fluid circulation pumps under high-temperature, high-pressure, and high-temperature conditions is difficult, making it difficult to establish a stable SCO2 high-flow rate corrosion testing system, which in turn hinders FACC testing of key materials under high-temperature, high-pressure, and supercritical CO2 conditions.

[0004] Summary of the Invention

[0005] In view of the above problems, the present application is proposed to provide a supercritical carbon dioxide continuous flow corrosion testing system and testing method that overcome the above problems or at least partially solve the above problems.

[0006] An embodiment of the present application provides a supercritical carbon dioxide continuous flow corrosion test system, which includes an air supply system and a closed-loop test system circuit, wherein the test system circuit includes: a circulation tank, which is connected to the air supply system, and the circulation tank is provided with a feed inlet and a circulation tank outlet. The liquid carbon dioxide released by the air supply system enters the circulation tank through the feed inlet to provide liquid carbon dioxide for the test system circuit; a circulation pump, which is connected to the circulation tank outlet of the circulation tank and is configured to provide pressure boost and flow power for the circulation of the liquid carbon dioxide; a flow meter, which is connected to the circulation pump and is configured to measure the flow rate of the liquid carbon dioxide; a heater, which is connected to the flow meter and is configured to vaporize the liquid carbon dioxide into carbon dioxide gas; a test section, which is provided with a test section inlet and a test section outlet. The carbon dioxide gas enters the test section through the test section inlet. The section is constructed as a place for storing samples to be tested and for continuous corrosion testing, and the carbon dioxide gas after the test is discharged through the test section outlet; the regenerator is provided with a first inlet and a first outlet of the regenerator, and the carbon dioxide gas after the test enters the regenerator through the first inlet of the regenerator and exchanges heat with the liquid carbon dioxide flowing into the regenerator, and the carbon dioxide gas after heat exchange is discharged through the first outlet of the regenerator; the condenser is provided with a condenser inlet and a condenser outlet, and the condenser inlet is connected to the first outlet of the regenerator so that the carbon dioxide gas after heat exchange enters the condenser for condensation, and the condensed liquid carbon dioxide is discharged through the condenser outlet; wherein, the circulation tank is also provided with a circulation tank inlet, and the liquid carbon dioxide discharged from the condenser outlet enters the circulation tank through the circulation tank inlet, thereby realizing the recycling of the liquid carbon dioxide and forming a closed-loop test system loop.

[0007] An embodiment of the present application also provides a supercritical carbon dioxide continuous flow corrosion test method, which adopts the test system in the above embodiment. The method includes: liquid carbon dioxide released from the gas supply system is transported to a circulation pump through a circulation tank; the circulation pump increases the pressure of the liquid carbon dioxide to a first pressure, and a portion of the pressurized liquid carbon dioxide flows into the flow meter; the flow meter outlet is opened so that a portion of the liquid carbon dioxide in the flow meter flows into the heater; the heater heats the liquid carbon dioxide to a preset temperature, and the liquid carbon dioxide changes into carbon dioxide gas; the carbon dioxide gas flows into the test section for a continuous flow corrosion test, and the carbon dioxide gas after the test is discharged through the test section outlet; the carbon dioxide gas after the test flows into the regenerator for heat exchange to obtain heat-exchanged carbon dioxide gas; the carbon dioxide gas after heat exchange is condensed by the condenser to obtain liquid carbon dioxide, and the liquid carbon dioxide flows into the circulation tank for recovery.

[0008] According to the embodiments provided in this application, a circulating pump is used to establish a stable high-pressure environment, a variable temperature and variable power heater is used to establish a stable high-temperature environment, and a flow meter is used to measure the flow rate in the test system loop, thereby obtaining a test system with adjustable flow rate. Liquid carbon dioxide in the regenerator is used to cool the carbon dioxide gas after the test, and then a condenser is used to convert the cooled carbon dioxide gas into liquid carbon dioxide and recycle it into the circulation tank, thereby achieving zero carbon dioxide emissions and reducing the energy consumption of the test system, thereby achieving energy conservation. On this basis, a high-temperature, high-pressure supercritical carbon dioxide continuous flow corrosion closed-loop test system with controllable flow rate and variable temperature is constructed.

[0009] According to the embodiments of the present application, the method provided by the present application not only takes into account the use of a regenerator to recover the heat of the carbon dioxide gas, but also takes into account the use of a condenser to condense and recover the carbon dioxide gas after heat exchange, thereby reducing carbon dioxide emissions, and recycling the recovered liquid carbon dioxide into the circulation tank, so that the entire system becomes a high-pressure, continuous, and closed circulation system. In addition, the method in the present application also utilizes a circulating pump variable frequency to adjust the pressure in the test system loop, and uses a heater to achieve variable temperature and variable power adjustment of the test section of the test system loop; and adjusts the flow of the flow meter through the valve on the first bypass, ultimately placing the entire system in a variable flow, high-temperature, high-pressure, supercritical carbon dioxide closed-loop continuous high-flow rate flow environment for flow corrosion testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] FIG1 is a schematic diagram of a supercritical carbon dioxide continuous flow corrosion performance testing system in an embodiment of the present application.

[0011] FIG2 is a cross-sectional schematic diagram of the connection between the test section and other pipe sections in an embodiment of the present application.

[0012] FIG3 is a schematic diagram of the connection between the sealing member of the test section and the sealing members of other pipe sections according to an embodiment of the present application.

[0013] FIG4 is a schematic structural diagram of a sample holder according to an embodiment of the present application.

[0014] FIG5 is a schematic cross-sectional view of the sample holder shown in FIG4.

[0015] FIG6 is a schematic structural diagram of a clamping member according to an embodiment of the present application.

[0016] FIG. 7 is a schematic diagram of placing a sample to be tested in a clamping member according to an embodiment of the present application.

[0017] FIG8 is a schematic diagram of a sample holder and a buffer member after being connected according to an embodiment of the present application.

[0018] FIG. 9 is a schematic diagram of placing a sample holder and a buffer member in a test section according to an embodiment of the present application.

[0019] [Description of Reference Numerals]

[0020] 1-vacuum pump, 2-raw material tank, 3-boosting pump, 4-circulation tank, 5-circulation pump, 6-flow meter, 7-heater, 8-test section, 9-primary regenerator, 10-secondary regenerator, 11-condenser, 12-mass spectrometer, 13-first bypass, 14-second bypass, 15-third bypass;

[0021] 1A-vacuum pump inlet, 1B-vacuum pump outlet, 21-raw material inlet, 22-raw material outlet, 31-boosting pump inlet, 32-boosting pump outlet, 41-feeding inlet, 42-circulating tank outlet, 43-circulating tank inlet, 51-circulating pump inlet, 52-circulating pump outlet, 61-flow meter inlet, 62-flow meter outlet, 71-heater inlet, 72-heater outlet, 81-test section inlet, 82-test section outlet, 91-first inlet of primary regenerator, 92-first outlet of primary regenerator, 93-second inlet of primary regenerator, 94-second outlet of primary regenerator, 101-second inlet of secondary regenerator, 102-second outlet of secondary regenerator, 103-first inlet of secondary regenerator, 104-first outlet of secondary regenerator, 111-condenser inlet, 112-condenser outlet, 121-mass spectrometer inlet;

[0022] 200-samples to be tested;

[0023] 50-fasteners;

[0024] 60-intake pipe section, 601-seal;

[0025] 70-detachable section, 700-elbow section, 701-seal;

[0026] 80-test pipe section, 801-seal, 8011-flange, 8012-weld lip;

[0027] 83-buffer, 831-fixing part, 832-connecting part;

[0028] 84-sample holder, 840-clamping member, 8401-trough body, 8402-clamping slot, 8403-mounting hole, 8404-connecting part, 8405-connecting hole;

[0029] F1-first valve, F2-second valve, F3-third valve, F4-fourth valve, F5-fifth valve, F6-sixth valve, F7-seventh valve, F8-eighth valve, F9-ninth valve, F10-tenth valve, F11-eleventh valve, F12-twelfth valve, F13-thirteenth valve. DETAILED DESCRIPTION

[0030] To make the purpose, technical solutions, and advantages of this application more clear, the technical solutions of this application will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of this application. Obviously, the described embodiments are representative embodiments of this application, not all embodiments. Based on the described embodiments of this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0031] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in this application should have the usual meanings understood by people with ordinary skills in the field to which this application belongs. If the full text involves descriptions such as "first" and "second", the "first" and "second" descriptions are only used to distinguish similar objects, and cannot be understood as indicating or implying their relative importance, order of precedence, or implicitly indicating the number of technical features indicated. It should be understood that the data described by "first" and "second" can be interchangeable under appropriate circumstances. If "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes Solution A, Solution B, or solutions that meet both A and B.

[0032] FIG1 is a schematic diagram of a supercritical carbon dioxide continuous flow corrosion performance testing system in an embodiment of the present application.

[0033] A supercritical carbon dioxide continuous flow corrosion performance testing system provided in an embodiment of the present application, as shown in Figure 1, includes: a circulation tank 4, a circulation pump 5, a flow meter 6, a heater 7, a test section 8, a regenerator and a condenser 11.

[0034] Specifically, a circulation tank 4 is connected to the gas supply system. One end of the circulation tank 4 is provided with a feed inlet 41 and the other end is provided with a circulation tank outlet 42. Liquid carbon dioxide released by the gas supply system enters the circulation tank 4 through the feed inlet 41, providing liquid carbon dioxide for the test system circuit. A circulation pump 5 is connected to the circulation tank 4 and is configured to provide pressure boost and flow power for the circulation of the liquid carbon dioxide. A flow meter 6 is connected to the circulation pump 5 and is configured to measure the flow rate of the liquid carbon dioxide. A heater 7 is connected to the flow meter 6 at one end and to the test section 8 at the other end and is configured to vaporize the liquid carbon dioxide into carbon dioxide gas. The test section 8 is provided with a test section inlet 81 and a test section outlet 82. Carbon dioxide gas enters the test section 8 through the test section inlet 81. The test section 8 is configured to store the test sample 200 and undergo continuous corrosion testing. The carbon dioxide gas after testing (i.e., the carbon dioxide gas that enters the test section 8 and flows through the test sample 200) is discharged through the test section outlet 82. The regenerator is provided with a first inlet and a first outlet of the regenerator. The carbon dioxide gas after the test enters the regenerator through the first inlet of the regenerator and exchanges heat with the liquid carbon dioxide flowing into the regenerator. The carbon dioxide gas after heat exchange is discharged through the first outlet of the regenerator. The liquid carbon dioxide flowing out of the circulation tank 4 can first exchange heat with the carbon dioxide gas in the regenerator and then enter the heater 7 to be heated and vaporized into carbon dioxide gas. The condenser 11 is provided with a condenser inlet 111 and a condenser outlet 112. The condenser inlet 111 is connected to the first outlet of the regenerator so that the carbon dioxide gas after heat exchange enters the condenser 11 for condensation, and the condensed liquid carbon dioxide is discharged through the condenser outlet 112. Among them, a circulation tank inlet 43 is also provided at one end of the circulation tank 4. The liquid carbon dioxide discharged from the condenser outlet 112 enters the circulation tank 4 through the circulation tank inlet 43, realizing the recycling of liquid carbon dioxide and forming a closed-loop test system circuit.

[0035] In the embodiments of the present application, a circulating pump is used to establish a stable high-pressure environment, a variable temperature and variable power heater is used to establish a stable high-temperature environment, and a flow meter is used to measure the flow rate in the test system loop, thereby obtaining a test system with adjustable flow rate. Liquid carbon dioxide in the regenerator is used to cool the carbon dioxide gas after the test to reduce the energy consumption of the test system and achieve energy conservation. The cooled carbon dioxide gas is then converted into liquid carbon dioxide using a condenser and recycled into the circulation tank, achieving zero carbon dioxide emissions. On this basis, a high-temperature, high-pressure supercritical carbon dioxide continuous flow corrosion closed-loop test system and method with controllable flow rate and variable temperature is constructed.

[0036] According to some embodiments of the present application, as shown in Figure 1, the gas supply system includes: a raw material tank 2 and a booster pump 3. Among them, the raw material tank 2 is used to store liquid carbon dioxide raw materials. The raw material tank 2 is provided with a raw material inlet 21 and a raw material outlet 22. The raw material inlet 21 is connected to the tank truck pipeline. A second valve F2 is provided on the connected pipeline. The second valve F2 is used to control the flow of liquid carbon dioxide from the tank truck into the raw material tank 2. The tank truck is used to provide liquid carbon dioxide. Therefore, when the raw material tank 2 is connected to the tank truck, the raw material tank 2 also has the function of buffering and collecting carbon dioxide. The booster pump 3 is provided with a booster pump inlet 31 and a booster pump outlet 32. The booster pump inlet 31 is connected to the raw material outlet 22. The connection method includes a pipeline. A third valve F3 is also provided on the pipeline between the booster pump inlet 31 and the raw material outlet 22. The third valve F3 is used to control the flow of liquid carbon dioxide released from the raw material tank 2 into the booster pump 3. The booster pump 3 is configured to pressurize the liquid carbon dioxide discharged from the raw material tank 2 and transport the pressurized liquid carbon dioxide to the circulation tank 4 through the booster pump outlet 32.

[0037] According to some embodiments of the present application, as shown in FIG. 1 , the test system further includes a vacuum pump 1 having a vacuum pump inlet 1A and a vacuum pump outlet 1B. One end of the vacuum pump inlet 1A is connected to the booster pump outlet 32. The vacuum pump 1 is configured to perform an airtightness check on the gas supply system before startup and to extract air from the gas supply system. The extracted air is then discharged through the vacuum pump outlet 1B to ensure that the test system is not affected by impurities other than liquid carbon dioxide. The vacuum pump 1 and the booster pump 3 can be connected by a pipeline. The pipeline is provided with a first valve F1 and a fourth valve F4. The fourth valve F4 is located near the booster pump outlet 32 ​​and is used to control the flow rate of pressurized liquid carbon dioxide released by the booster pump 3 into the circulation tank 4. The first valve F1 is located near the vacuum pump inlet 1A and serves as the main valve for the test system. Through the synergistic action of the first valve F1 and the fourth valve F4, the vacuum pump 1 can be used to perform an airtightness safety check on the gas supply system.

[0038] According to some embodiments of the present application, as shown in FIG1 , one end of the vacuum pump inlet 1A is also connected to the feed inlet 41, and is configured to perform an airtightness check on the test system loop before the test system loop is started, and to extract the air in the test system loop, and the extracted air is discharged through the vacuum pump outlet 1B. The connection method of the feed inlet 41 and the pipeline between the vacuum pump 1 and the booster pump 3 includes a pipeline, and the connection point is located between the first valve F1 and the fourth valve F4, so that the vacuum pump 1, the booster pump 3 and the circulation tank 4 are interconnected. A fifth valve F5 is also provided on the pipeline between the circulation tank 4 and the vacuum pump 1 and the booster pump 3. The fifth valve F5 is used to control the flow rate of pressurized liquid carbon dioxide entering the circulation tank 4, and through the synergistic effect between the first valve F1 and the fifth valve F5, the vacuum pump 1 is used to perform an airtightness safety check on the test system loop.

[0039] According to some embodiments of the present application, as shown in Figure 1, the circulation pump 5 is provided with a circulation pump inlet 51 and a circulation pump outlet 52. The circulation pump inlet 51 is connected to the circulation tank outlet 42 by a pipeline, and a sixth valve F6 is provided on the connected pipeline. The sixth valve F6 is used to control the flow of liquid carbon dioxide released from the circulation tank 4 into the circulation pump 5, wherein the circulation pump 5 can be a plunger pump. The circulation pump 5 is constructed to provide boosting and flow power for the circulation of liquid carbon dioxide, and can perform frequency conversion regulation on the pressure and flow of liquid carbon dioxide. The flowmeter 6 is provided with a flowmeter inlet 61 and a flowmeter outlet 62. The flowmeter inlet 61 is connected to the circulation pump outlet 52 so that the pressurized liquid carbon dioxide is transported to the flowmeter 6. The flowmeter 6 is used to measure the flow rate of the liquid carbon dioxide, specifically to measure the flow rate of the carbon dioxide gas in the test section 8 in the test system loop. Heater 7 is provided with a heater inlet 71 and a heater outlet 72. Heater inlet 71 is connected to flowmeter outlet 62 to transport a portion of the pressurized liquid carbon dioxide into heater 7 for heating, thereby converting the liquid carbon dioxide into carbon dioxide gas. The flowmeter 6 is connected to heater 7 by a pipeline. The connected pipeline is provided with a seventh valve F7, which is used to control the flow rate of liquid carbon dioxide entering heater 7. Test section 8 is provided with a test section inlet 81 and a test section outlet 82 to allow carbon dioxide gas to flow into test section 8 for continuous flow corrosion testing. Test section inlet 81 is connected to heater outlet 72 by a pipeline. The connection method includes a pipeline. Through the coordinated use of circulating pump 5 and flowmeter 6, the carbon dioxide gas flow rate in test section 8 can be controlled to meet the requirements of testing the test piece at different flow rates. The flow rate in test section 8 can reach 12-15 m / s, thereby realizing high-flow continuous flow testing.

[0040] According to some embodiments of the present application, the test system loop further includes a first bypass 13, one end of which is connected to the pipeline between the circulation pump outlet 52 and the flowmeter inlet 61, and the other end of which is connected to the pipeline between the condenser inlet 111 and the first outlet of the regenerator, thereby forming a closed loop between the circulation tank 4, the circulation pump 5, the first bypass 13, the condenser 11, and the circulation tank 4. A portion of the liquid carbon dioxide entering the circulation pump 5 through the circulation pump inlet 51 enters the condenser 11 through the first bypass 13, while another portion enters the flowmeter 6. Furthermore, an eighth valve F8 is provided on the first bypass 13. This eighth valve F8 can regulate the flow rate of the liquid carbon dioxide returning to the condenser 11 and the flow rate of the liquid carbon dioxide in the test system loop, thereby reducing the flow load on the flowmeter 6 and preventing the test system from unstable operation due to excessive carbon dioxide entering the test section 8.

[0041] According to an embodiment of the present application, the regenerator is further provided with a second inlet and a second outlet of the regenerator, and the test system loop further includes a second bypass 14 and a third bypass 15. One end of the second bypass 14 is connected to the pipeline between the flowmeter outlet 62 and the seventh valve F7, and the other end is connected to the second inlet of the regenerator. Furthermore, a ninth valve F9 is provided on the second bypass 14, and the ninth valve F9 is used to control the flow rate of the second bypass, thereby controlling the heat exchange effect within the regenerator. One end of the third bypass 15 is connected to the second outlet of the regenerator, and the other end is connected to the heater inlet 71. A tenth valve F10 is provided on the third bypass 15, and the tenth valve F10 is used to control the flow rate on the third bypass, which can simply control the temperature within the heater 7 and thus control energy consumption. In an embodiment of the present application, the liquid carbon dioxide flowing out of the flow meter outlet 62 can enter the regenerator through the second bypass 14 and exchange heat with the carbon dioxide gas entering the regenerator through the first inlet of the regenerator. After the heat exchange, the liquid carbon dioxide is discharged from the second outlet of the regenerator and then enters the heater 7 through the third bypass 15. The liquid carbon dioxide flowing out of the flow meter outlet 62 is transported to the regenerator through the second bypass 14 to exchange heat with the carbon dioxide gas, which can reduce the temperature of the carbon dioxide gas so that the subsequent condenser 11 can liquefy the carbon dioxide gas to form liquid carbon dioxide and recover it to the circulation tank 4 for recycling. The use of the third bypass 15 to transport the liquid carbon dioxide after heat exchange in the regenerator to the heater 7 can increase the temperature of the liquid carbon dioxide, reduce the energy consumption of the heater 7 to heat the liquid carbon dioxide, and achieve energy saving.

[0042] According to some embodiments of the present application, the regenerator is multi-stage, with the first outlet of each stage connected to the first inlet of the next stage. The multiple stages are sequentially connected in series, with the number of regenerators preferably being 2-4. In the embodiments of the present application, connecting multiple regenerators in series effectively reduces the temperature of the carbon dioxide gas, facilitating subsequent condensation by the condenser 11. This also allows for the recycling of heat exchange energy, reducing energy consumption in the test system circuit.

[0043] For example, the regenerator shown in Figure 1 includes a primary regenerator and a secondary regenerator. The primary regenerator 9 is provided with a primary regenerator first inlet 91 and a primary regenerator first outlet 92, and the secondary regenerator 10 is provided with a secondary regenerator first inlet 103 and a secondary regenerator first outlet 104. The primary regenerator first inlet 91 is connected to the test section outlet 82, so that the carbon dioxide gas after the test enters the primary regenerator 9 through the primary regenerator first inlet 91 for primary heat exchange, thereby producing primary heat-exchanged carbon dioxide gas, thereby initially reducing the temperature of the carbon dioxide gas. The primary regenerator first outlet 92 is connected to the secondary regenerator first inlet 103, so that the carbon dioxide gas after the primary heat exchange enters the secondary regenerator 10 through the secondary regenerator first inlet 103 for secondary heat exchange, thereby producing secondary heat-exchanged carbon dioxide gas, thereby further reducing the temperature of the carbon dioxide gas. The carbon dioxide gas after secondary heat exchange is discharged through the secondary regenerator first outlet 104 and enters the condenser 11 for liquefaction, converting the carbon dioxide gas into liquid carbon dioxide.

[0044] According to some embodiments of the present application, the primary regenerator 9 is further provided with a primary regenerator second inlet 93 and a primary regenerator second outlet 94, and the secondary regenerator 10 is further provided with a secondary regenerator second inlet 101 and a secondary regenerator second outlet 102. The secondary regenerator second inlet 101 is connected to the flow meter outlet 62 via the second bypass 14, so that the liquid carbon dioxide flowing out of the flow meter outlet 62 can enter the secondary regenerator 10, providing cold energy for the secondary heat exchange performed by the secondary regenerator 10, and reducing the temperature of the carbon dioxide gas in the secondary regenerator. The liquid carbon dioxide after the secondary heat exchange is discharged through the secondary regenerator second outlet 102 and enters the primary regenerator for recycling. The secondary regenerator second outlet 102 is connected to the primary regenerator second inlet 93, so that the liquid carbon dioxide after the secondary heat exchange enters the primary regenerator 9, providing cold energy for the primary heat exchange performed by the primary regenerator 9, and reducing the temperature of the carbon dioxide gas in the primary regenerator 9. The liquid carbon dioxide after the first-stage heat exchange is discharged through the second outlet 94 of the first-stage regenerator and flows into the heater 7 , thereby reducing the energy consumption of the heater 7 .

[0045] According to some embodiments of the present application, a mass spectrometer 12 is further connected to the pipeline connecting the test section outlet 82 and the first inlet of the regenerator. The mass spectrometer 12 detects the purity of the carbon dioxide gas discharged from the test section outlet 82 after the test. Furthermore, the mass spectrometer 12 is also provided with a mass spectrometer inlet 121 so that the carbon dioxide gas after the test enters the mass spectrometer through the mass spectrometer inlet 121. The mass spectrometer inlet 121 is connected to the pipeline between the test section outlet 82 and the first inlet of the regenerator, and the connection method includes pipeline connection. A thirteenth valve F13 is also provided on the connected pipeline for controlling the flow rate of the carbon dioxide gas after the test entering the mass spectrometer. For example, in Figure 1, a mass spectrometer 12 is connected to the pipeline connecting the test section outlet 82 and the first inlet 91 of the first-stage regenerator. In an embodiment of the present application, the mass spectrometer 12 is used to perform purity detection on the carbon dioxide gas after the test. When it is detected that the purity of the carbon dioxide gas is not high, it is necessary to replace the liquid carbon dioxide in the test system loop.

[0046] Referring to FIG2 , in some embodiments, the test system may further include an air inlet section 60 and an air outlet section (not shown). A test section inlet 81 of the test section 8 is detachably connected to the air inlet section 60, and a test section outlet 82 of the test section 8 is detachably connected to the air outlet section. The test section 8 may include the test section 80 and seals 801 disposed at both ends of the test section 80 for sealingly connecting to the air inlet section 60 and the air outlet section.

[0047] The sealing member 801 has a through hole for gas circulation. The sealing members 801 at both ends of the test pipe section 80 form a test section inlet 81 and a test section outlet 82 respectively.

[0048] Referring to Figure 3, in some embodiments, the seal 801 may include a flange 8011 with a through hole, and a connecting hole is set on the flange 8011. The seals of other pipe sections also include flanges accordingly. The detachable connection of the flanges between the two seals is achieved by the cooperation of a fastener 50 (such as a bolt or stud) passing through the connecting hole and a nut.

[0049] In some embodiments, the seal 801 may further include a welding lip 8012, which is welded to the flange 8011. The seals of other pipe sections (such as the seal 601 of the air inlet pipe section 60 and the seal of the air outlet pipe section) also include welding lips accordingly. The sealing performance in the test section 8 is ensured by welding between the two welding lips. When the two seals are separated, it is only necessary to cut the weld of the welding lip and re-weld it when it is used again, which is convenient for repeated use and can also ensure the sealing performance. By setting the seal, the test section 8 can reach the experimental environment expected by the experiment and meet the sealing requirements under high temperature and high pressure. For example, the test section 8 can meet the experimental environment with a working pressure of 30MPa and a working temperature of 650°C.

[0050] In some embodiments, the air inlet pipe section 60 and the air outlet pipe section can be fixed separately. In such an embodiment, when it is necessary to remove the test sample 200 from the test section 8, the two sealing members 801 of the test section 8 need to be separated from the air inlet pipe section 60 and the air outlet pipe section, respectively. Then, the test section 8 can be lifted to expose its test section inlet 81 or test section outlet 82 while keeping the test sample 200 inside stationary, thereby removing the test sample 200.

[0051] Referring to FIG. 2 , in some embodiments, the test system may further include a detachable section 70, through which the air intake section 60 and the test section 8 are connected. When the test sample 200 needs to be removed, the detachable section 70 is separated from the seals 801 of the air intake section 60 and the test section 8, respectively. With the test section 8 remaining in place, the test sample 200 can be removed from the test section 8 without having to completely remove the test section 8 from the pipeline. Compared to a technical solution without the detachable section 70, the technical solution with the detachable section 70 facilitates the removal of the test sample 200.

[0052] In some embodiments, the inlet pipe section 60 and the test section 8 are not coaxially arranged. The detachable section 70 may include a bend section 700 and two seals 701. This not only achieves a sealed connection between the inlet pipe section 60 and the test section 8, but also redirects the flow of the medium, thereby buffering the airflow. In such an embodiment, the detachable section 70 can be smaller, making it easier to remove the detachable section 70 and reducing the overall footprint of the test system. The bend section 700 may, for example, be a 90-degree bend.

[0053] In some embodiments, seal 701 may have the same structure as seal 801 and seal 601 .

[0054] In some embodiments, the test system may further include a sample holder 84 for holding the sample 200 to be tested. The sample holder 84 is detachably disposed in the test section 8.

[0055] Referring to Figures 4 to 7 , in some embodiments, the sample holder 84 may include two opposing clamping members 840. Each clamping member 840 is formed with a through-groove 8401 and multiple pairs of clamping grooves 8402. The multiple pairs of clamping grooves 8402 are spaced apart along the length of the groove 8401, with each pair of clamping grooves 8402 located on either side of the groove 8401. The two clamping members 840 are detachably connected to collectively clamp the sample 200 to be tested within the clamping grooves 8402 of the two clamping members 840. The grooves 8401 are configured to allow carbon dioxide gas to pass along the surface of the sample 200 to be tested. When the sample holder 84 is placed in the test section 8, carbon dioxide gas can enter the grooves 8401 and flow across the surface of the sample 200 to be tested. Since the carbon dioxide gas can flow across the opposing surfaces of the sample 200 to be tested, it facilitates uniform corrosion of the sample 200.

[0056] The sample holder 84 of the present embodiment prevents vibration of each test sample 200 during testing and allows as much of its surface as possible to remain within the supercritical carbon dioxide environment. Furthermore, the structure of the sample holder 84 of the present embodiment can be used with test sections 8 having smaller diameters (e.g., diameters of 3 cm or less), enabling testing of the test samples 200 at higher medium flow rates (e.g., 12 to 15 m / s).

[0057] In some embodiments, the clamping groove 8402 can be connected to the tank body 8401. The clamping groove 8402 can match the shape of the test sample 200 to facilitate clamping the test sample 200 by the two clamping members 840. In some embodiments, the test sample 200 can be a circular wafer. The edge of the clamping groove 8402 away from the tank body 8401 can be curved.

[0058] In some embodiments, the groove body 8401 may be an arc-shaped groove to facilitate the flow of carbon dioxide gas.

[0059] Referring to Figures 5 and 6, in some embodiments, the clamping member 840 can have an arcuate structure, with the two clamping members 840 collectively forming a circular ring structure. Each of the two clamping members 840 can be provided with a mounting hole 8403, so that the two clamping members 840 can be removably connected using a fastener passing through the mounting hole 8403. The fastener can be, for example, a bolt. The sample holder 84 of the present embodiment is easy to disassemble and operate, making it suitable for frequent sampling during testing.

[0060] In some embodiments, the test system may include a plurality of sample holders 84 that are detachably connected together. Referring to FIG4 , in some embodiments, a connecting portion 8404 is formed at each end of a clamping member 840, and two adjacent clamping members 840 are connected via their respective connecting portions 8404. The connecting portion 8404 is provided with a plurality of connecting holes 8405, so that two sample holders 84 can be detachably connected using fasteners passing through the connecting holes 8405. The sample holders 84 of the embodiment of the present application can be connected to each other, thereby helping to avoid vibration between the sample holders 84, thereby helping to improve the accuracy of the test.

[0061] When using a testing system to perform corrosion testing on test samples 200, a large number of test samples 200 (e.g., dozens or even hundreds of test samples) of different materials must be loaded into each experiment. The placement of the test samples 200 within the test section 8 is a significant challenge during testing. The present embodiment of the present invention utilizes a plurality of interconnected sample holders 84 to enable the placement of a large number of test samples 200 within the test section 8. For example, four test samples 200 can be placed into the clamping grooves 8402 of a clamping member 840, and then another clamping member 840 can be placed over the clamping member 840. Four bolts are then used to connect the two clamping members 840 to form a complete sample holder 84. To accommodate 100 test samples 200, 25 sample holders 84 can be bolted together end-to-end. After completion, the sample holders 84 can be pushed into the test section 8 through the test section entrance 81 of the test section 8.

[0062] 8 and 9 , in some embodiments, the test system may include a buffer 83 detachably disposed within the test section 8 , through which carbon dioxide gas enters the sample holder 84 . The buffer 83 is used to reduce the impact of the carbon dioxide gas on the sample 200 to be tested.

[0063] In some embodiments, the buffer 83 is a tubular member having an inner diameter substantially the same as that of the groove 8401 of the sample holder 84, so that when the carbon dioxide gas enters the groove 8401 of the sample holder 84 from the buffer 83, the flow area remains substantially unchanged, thereby stabilizing the gas flow.

[0064] In some embodiments, the buffer 83 may be integrally connected to the sample holder 84 .

[0065] In some embodiments, the buffer 83 may include a connector 832, and the buffer 83 can be detachably connected to the connecting portion 8404 of the sample holder 84 through the connector 832. Specifically, the connector 832 is provided with a connecting hole, and the connector 832 is detachably connected to the connecting portion 8404 of the sample holder 84 by a bolt.

[0066] In some embodiments, the buffer 83 further includes a fixing member 831 for detachably fixingly connecting with the seal 801, thereby fixing the sample holder 84 in the test section 8. After the seal 801 is separated from the seal of the adjacent pipe section, the fixing member 831 is separated from the seal 801, and then the buffer 83 and the connected sample holders 84 are directly removed from the test section 8 via the fixing member 831. By providing the buffer 83 connected to the sample holder 84, the embodiment of the present application can not only reduce the impact of carbon dioxide gas on the sample 200 to be tested, but also fix the sample holder 84 in the test section 8, and facilitate the one-time placement and removal of the sample holder 84 in the test section 8.

[0067] In some embodiments, the tubular member is smaller than the through-hole of the seal 801, and the fixing member 831 is larger than the through-hole of the seal 801, thereby enabling the tubular member to pass through the through-hole of the seal 801 and enter the test tube section 80, and the fixing member 831 to abut against the seal 801. In this way, when the carbon dioxide gas enters the test section 80, it will directly enter the interior of the sample holder 84 through the interior of the tubular member, resulting in a more stable gas flow.

[0068] In some embodiments, the fixing member 831 may be a flange formed at one end of the tubular member, with multiple mounting holes formed on the flange. Accordingly, the flange 8011 of the sealing member 801 also has multiple mounting holes formed therein, and the fixing member 831 and the flange 8011 are detachably connected by fasteners such as bolts.

[0069] In an embodiment of the present application, a supercritical carbon dioxide continuous flow corrosion test method is also provided, and the test method is described in detail below with reference to the schematic diagram shown in Figure 1. The test method includes: liquid carbon dioxide released from the gas supply system is transported to a circulation pump 5 through a circulation tank 4; the circulation pump 5 increases the pressure of the liquid carbon dioxide to a first pressure, and a portion of the pressurized liquid carbon dioxide flows into a flow meter 6; the liquid carbon dioxide flowing out of the flow meter 6 flows through a regenerator and then flows into a heater 7; the heater 7 heats the liquid carbon dioxide to a preset temperature, and the liquid carbon dioxide changes into supercritical carbon dioxide gas; the supercritical carbon dioxide gas flows into a test section 8 for a continuous flow corrosion test, and the carbon dioxide gas after the test is discharged through the test section outlet 82; the carbon dioxide gas after the test flows into the regenerator to exchange heat with the liquid carbon dioxide to obtain heat-exchanged carbon dioxide gas; the heat-exchanged carbon dioxide gas is condensed by a condenser 11 to obtain liquid carbon dioxide, and the liquid carbon dioxide flows into the circulation tank 4 for recovery.

[0070] In an embodiment of the present application, in the variable flow rate, high temperature and high pressure supercritical carbon dioxide testing system provided in the above embodiment, the testing method provided in the present application is adopted to realize continuous flow testing of carbon dioxide, while achieving zero emission and recycling of carbon dioxide, and reducing energy consumption of the test system loop.

[0071] According to some embodiments of the present application, before loading liquid carbon dioxide into feed tank 2, third valve F3 is closed. After opening second valve F2, the liquid carbon dioxide from the tank truck is unloaded into feed tank 2. When the liquid carbon dioxide reaches a predetermined position in feed tank 2, unloading is complete, and second valve F2 is closed. Furthermore, prior to the continuous flow corrosion test, a sample to be tested, comprising metal, is placed into test section 8.

[0072] According to some embodiments of the present application, before liquid carbon dioxide is introduced into the test system, the air supply system and the test system loop are respectively checked for air tightness using a vacuum pump 1 , and the air in the air supply system and the test system loop is extracted.

[0073] Specifically, first conduct a water pressure test and an air tightness test on the air supply system and the test system circuit. After the water pressure test and the air tightness test are passed, the system is purged and drained before vacuuming. Before vacuuming the air supply system, close the second valve F2 and the fifth valve F5, and use the vacuum pump 1 to vacuum the air supply system. The specific vacuuming sequence is: vacuum pump inlet 1A, booster pump outlet 32, booster pump 3, booster pump inlet 31, raw material outlet 22 and raw material tank 2. Wait until the pressure of the air supply system reaches 1*10 -4 Pa~1*10 -5 Pa. At this time, the fourth valve F4 is closed, and the fifth valve F5, the sixth valve F6, the seventh valve F7, the eighth valve F8, the ninth valve F9, the tenth valve F10, the eleventh valve F11 and the twelfth valve F12 are opened in sequence to vacuum the test system loop. Specifically, the circulation tank 4, the circulation pump 5, the flow meter 6, the heater 7, the test section 8, the regenerator and the condenser 11 are vacuumed until the pressure in the test system loop reaches 1*10 -4 Pa~1*10 -5 The vacuuming is completed at Pa.

[0074] According to some embodiments of the present application, before the liquid carbon dioxide released from the raw material tank 2 is transported to the circulation tank 4 , the pressure of the liquid carbon dioxide is increased to a second pressure by using the booster pump 3 .

[0075] Specifically, the third valve F3, the fourth valve F4, and the fifth valve F5 are sequentially opened. Meanwhile, the first valve F1 on the vacuum pump inlet 1A, the sixth valve F6 on the circulation tank outlet 42, and the twelfth valve F12 on the condenser inlet 111 are checked to be closed. Booster pump 3 is activated to pressurize the liquid CO2 to 5.0-6.0 MPa, providing flow power for the liquid CO2. After observing that the liquid level in circulation tank 4 has reached the set level, booster pump 3 is turned off, thereby delivering the liquid CO2 to circulation tank 4.

[0076] Next, close the third valve F3, the fourth valve F4, the fifth valve F5, the seventh valve F7, the eleventh valve F11, and the twelfth valve F12 in sequence, while simultaneously checking that the eighth valve F8, the ninth valve F9, and the tenth valve F10 are closed. Then, start the circulation pump 5 to pressurize the liquid carbon dioxide released from the circulation tank 4 through the circulation tank outlet 42 to approximately 10 MPa, thereby achieving a pressure increase of the liquid carbon dioxide using the booster pump 5. The second pressure can be 10 MPa. At this point, open the ninth valve F9 on the flowmeter outlet 62 and the tenth valve F10 on the heater inlet 71. Close the seventh valve F7 on the heater inlet 71, and wait for the pressure in the test system loop to stabilize to approximately 10 MPa.

[0077] After the pressure in the system under test loop stabilizes at 10 MPa, valve F7 is opened, allowing some of the liquid carbon dioxide released from flowmeter 6 to enter heater 7. Heater 7 is started and gradually heated. Meanwhile, the frequency of circulating pump 5 is gradually increased, gradually raising the temperature to 550-620°C and the pressure to 30-35 MPa.

[0078] According to some embodiments of the present application, after the temperature and pressure in the test system circuit stabilize, the flow rate of flow meter 6 is adjusted by adjusting the opening of eighth valve F8 on first bypass 13, allowing the remaining portion of the pressurized liquid carbon dioxide to flow into condenser 11 through first bypass 13, thereby controlling the flow rate of liquid carbon dioxide in the test circuit. Once the carbon dioxide flow rate in the test system circuit meets the test operating conditions, a continuous flow corrosion test can be performed on the test sample in test section 8.

[0079] According to some embodiments of the present application, liquid carbon dioxide flows into heater 7 and is heated by heater 7 to convert the liquid carbon dioxide into carbon dioxide gas. The carbon dioxide gas enters test section 8 through test section inlet 81 for a continuous flow corrosion test. After the test, the carbon dioxide gas is discharged through test section outlet 82 and then enters the regenerator for heat exchange to reduce the temperature of the carbon dioxide gas. The carbon dioxide gas after the test can enter the primary regenerator 9 for primary heat exchange. The carbon dioxide gas obtained after the primary heat exchange then enters the secondary regenerator 10 for heat exchange to further reduce the temperature of the carbon dioxide gas.

[0080] According to some embodiments of the present application, part of the liquid carbon dioxide released by the flow meter 6 enters the regenerator through the second bypass 14 and exchanges heat with the carbon dioxide gas in the regenerator. The liquid carbon dioxide after heat exchange flows into the heater 7 for reuse.

[0081] For example, as shown in Figure 1, some of the liquid carbon dioxide released from the flowmeter 6 enters the secondary regenerator 10 via the second bypass 14 and the second inlet 101 of the secondary regenerator, exchanging heat with the carbon dioxide gas in the secondary regenerator 10, thereby reducing the temperature of the carbon dioxide gas. The liquid carbon dioxide after the secondary heat exchange flows out through the second outlet 102 of the secondary regenerator and flows into the primary regenerator 9 via the second inlet 93 of the primary regenerator, exchanging heat with the carbon dioxide gas in the primary regenerator 9, thereby reducing the temperature of the carbon dioxide gas. The liquid carbon dioxide after the primary heat exchange flows into the heater 7 via the third bypass 15, where it mixes with the liquid carbon dioxide released from the flowmeter outlet 62 and directly enters the heater 7. This can increase the temperature of the liquid carbon dioxide and reduce the energy consumption of the heater 7.

[0082] According to some embodiments of the present application, the method provided by the present application further includes: using a mass spectrometer 12 to detect the purity of the carbon dioxide gas discharged from the test section outlet 82, and replacing the liquid carbon dioxide of the entire system if the purity does not meet the standard.

[0083] In the embodiments of the present application, the method provided herein not only considers the use of a regenerator to recover the heat of the carbon dioxide gas, such as the primary regenerator 9 and the secondary regenerator 10; but also considers the use of a condenser to condense and recover the carbon dioxide gas after heat exchange, thereby reducing carbon dioxide emissions, and recycling the recovered liquid carbon dioxide into the circulation tank, so that the entire system becomes a high-pressure, continuous, and closed circulation system. In addition, the present application also uses a circulating pump 5 to frequency-control the pressure within the test system loop, and uses a heater 7 to achieve variable temperature and power regulation of the test section of the test system loop; and adjusts the flow rate of the flow meter 6 by adjusting the opening of the eighth valve F8 on the first bypass 13, ultimately placing the entire system in a variable flow, high-temperature, high-pressure, supercritical carbon dioxide closed-loop continuous high-flow rate flow environment for flow corrosion testing.

[0084] The present application has been described in detail above with reference to the accompanying drawings and embodiments. However, the present application is not limited to the above embodiments. Various modifications can be made within the scope of knowledge possessed by a person skilled in the art without departing from the purpose of the present application. Any content not described in detail in the present application may be based on existing technologies.

Claims

1. A supercritical carbon dioxide continuous flow corrosion test system, the test system comprising a gas supply system and a closed-loop test system circuit, characterized in that: The test system loop comprises: A circulation tank connected to the gas supply system, the circulation tank is provided with a supply inlet and a circulation tank outlet, and the liquid carbon dioxide released by the gas supply system enters the circulation tank through the supply inlet to provide liquid carbon dioxide for the test system loop; a circulation pump connected to the circulation tank outlet of the circulation tank and configured to provide pressure boost and flow power for the circulation of the liquid carbon dioxide; a flow meter connected to the circulation pump and configured to measure the flow rate of the liquid carbon dioxide; a heater connected to the flow meter and configured to vaporize the liquid carbon dioxide into carbon dioxide gas; The test section is provided with a test section inlet and a test section outlet, the carbon dioxide gas enters the test section through the test section inlet, the test section is configured as a place for storing samples to be tested and for continuous corrosion testing, and the carbon dioxide gas after the test is discharged through the test section outlet; a regenerator, provided with a first inlet of the regenerator and a first outlet of the regenerator, wherein the carbon dioxide gas after the test enters the regenerator through the first inlet of the regenerator and exchanges heat with the liquid carbon dioxide flowing into the regenerator, and the carbon dioxide gas after the heat exchange is discharged through the first outlet of the regenerator; A condenser is provided with a condenser inlet and a condenser outlet, wherein the condenser inlet is connected to the first outlet of the regenerator, so that the carbon dioxide gas after the heat exchange enters the condenser for condensation, and the condensed liquid carbon dioxide is discharged through the condenser outlet; The circulation tank is also provided with a circulation tank inlet, and the liquid carbon dioxide discharged from the condenser outlet enters the circulation tank through the circulation tank inlet, thereby realizing the recycling of the liquid carbon dioxide and forming a closed-loop test system loop.

2. The test system according to claim 1, characterized in that: The gas supply system comprises: a raw material tank for storing liquid carbon dioxide raw material, wherein the raw material tank is provided with a raw material inlet and a raw material outlet.

3. The test system according to claim 2, characterized in that: The air supply system also includes a booster pump; The booster pump is provided with a booster pump inlet and a booster pump outlet, the booster pump inlet is connected to the raw material outlet, and the booster pump is configured to pressurize the liquid carbon dioxide discharged from the raw material tank and transport the pressurized liquid carbon dioxide to the circulation tank through the booster pump outlet.

4. The test system according to claim 3, characterized in that: Also includes: Vacuum pump; The vacuum pump is provided with a vacuum pump inlet and a vacuum pump outlet, and the vacuum pump inlet is connected to the booster pump outlet. The air supply system is connected to the vacuum pump and is configured to perform an air tightness check on the air supply system and to extract the air in the air supply system before the air supply system is started, and the extracted air is discharged through the vacuum pump outlet.

5. The test system according to claim 4, characterized in that: The vacuum pump inlet is also connected to the feed inlet, and is configured to perform an air tightness check on the test system loop and extract the air in the test system loop before the test system loop is started, and the extracted air is discharged through the vacuum pump outlet.

6. The test system according to claim 5, characterized in that: The circulation pump is provided with a circulation pump inlet and a circulation pump outlet, and the flow meter is provided with a flow meter inlet and a flow meter outlet; The test system loop also includes: A first bypass, one end of which is connected to a pipeline between a circulation pump outlet and a flow meter inlet, and the other end of which is connected to a pipeline between a condenser inlet and a first outlet of a regenerator; A portion of the liquid carbon dioxide that enters the circulation pump through the circulation pump inlet enters the condenser through the first bypass to adjust the flow of the liquid carbon dioxide in the test system loop.

7. The test system according to claim 1 or 5, characterized in that: The regenerator is further provided with a second inlet of the regenerator and a second outlet of the regenerator, and the test system loop further comprises: a second bypass and a third bypass; One end of the second bypass is connected to the flow meter outlet, and the other end is connected to the regenerator inlet, and one end of the third bypass is connected to the second outlet of the regenerator, and the other end is connected to the heater inlet; wherein, liquid carbon dioxide enters the flow meter through the flow meter inlet, and a portion of the liquid carbon dioxide released from the flow meter outlet enters the regenerator through the second bypass, and exchanges heat with the carbon dioxide gas entering the regenerator, and the liquid carbon dioxide after the heat exchange is discharged through the second outlet of the regenerator and enters the heater through the third bypass.

8. The test system according to claim 1 or 7, characterized in that: The regenerator is multi-stage, and the first outlet of the regenerator of each stage is connected to the first inlet of the regenerator of the next stage, so that the multi-stage regenerators are connected in series in sequence.

9. The test system according to claim 8, characterized in that: The regenerator comprises a primary regenerator and a secondary regenerator, the primary regenerator is provided with a primary regenerator first inlet and a primary regenerator first outlet, the secondary regenerator is provided with a secondary regenerator first inlet and a secondary regenerator first outlet; The first inlet of the primary regenerator is connected to the outlet of the test section, so that the carbon dioxide gas after the test enters the primary regenerator through the first inlet of the primary regenerator for primary heat exchange to obtain carbon dioxide gas after primary heat exchange; The first outlet of the primary heat exchanger is connected to the first inlet of the secondary heat exchanger, so that the carbon dioxide gas after the primary heat exchange enters the secondary heat exchanger through the first inlet of the secondary heat exchanger for secondary heat exchange. The carbon dioxide gas after heat exchange is discharged through the first outlet of the secondary heat exchanger and enters the condenser.

10. The test system according to claim 9, characterized in that: The primary heat regenerator is further provided with a primary heat regenerator second inlet and a primary heat regenerator second outlet, and the secondary heat regenerator is further provided with a secondary heat regenerator second inlet and a secondary heat regenerator second outlet; The second inlet of the secondary regenerator is connected to the outlet of the flow meter through a second bypass, so that part of the liquid carbon dioxide released from the outlet of the flow meter enters the secondary regenerator to provide cold energy for the secondary heat exchange performed by the secondary regenerator, and the liquid carbon dioxide after the secondary heat exchange is discharged through the second outlet of the secondary regenerator; The second outlet of the secondary regenerator is connected to the second inlet of the primary regenerator, so that the liquid carbon dioxide after the secondary heat exchange enters the primary regenerator to provide cold energy for the primary heat exchange performed by the primary regenerator. The liquid carbon dioxide after the primary heat exchange is discharged through the second outlet of the primary regenerator and flows into the heater.

11. The test system according to claim 1, characterized in that: A mass spectrometer is also connected to the pipeline connecting the outlet of the test section and the first inlet of the regenerator, and the mass spectrometer detects the purity of the carbon dioxide gas discharged from the outlet of the test section after the test.

12. A supercritical carbon dioxide continuous flow corrosion test method, characterized in that: Using the test system according to any one of claims 1 to 11, the method comprises: The liquid carbon dioxide released by the gas supply system is transported to the circulation pump through the circulation tank; The circulation pump increases the pressure of the liquid carbon dioxide to a first pressure, and a portion of the pressurized liquid carbon dioxide flows into the flow meter; opening the flow meter outlet so that a portion of the liquid carbon dioxide in the flow meter flows into the heater; The heater heats the liquid carbon dioxide to a preset temperature, and the liquid carbon dioxide changes into carbon dioxide gas; The carbon dioxide gas flows into the test section to perform a continuous flow corrosion test, and the carbon dioxide gas after the test is discharged through the outlet of the test section; The carbon dioxide gas after the test flows into a regenerator for heat exchange to obtain carbon dioxide gas after heat exchange; The carbon dioxide gas after heat exchange is condensed by the condenser to obtain liquid carbon dioxide, and the liquid carbon dioxide flows into the circulation tank for recovery.

13. The method according to claim 12, characterized in that Before liquid carbon dioxide is introduced into the test system, the air tightness of the gas supply system and the test system loop are checked by using a vacuum pump, and the air in the gas supply system and the test system loop is extracted.

14. The method according to claim 13, characterized in that Before the liquid carbon dioxide released from the raw material tank is transported to the circulation tank, the pressure of the liquid carbon dioxide is increased to a second pressure by a booster pump.

15. The method according to claim 12, characterized in that Another part of the pressurized liquid carbon dioxide flows into the condenser through the first bypass to control the flow of the liquid carbon dioxide in the test loop.

16. The method according to claim 12, characterized in that Part of the liquid carbon dioxide released by the flow meter enters the regenerator through the second bypass and exchanges heat with the carbon dioxide gas in the regenerator. After the heat exchange, the liquid carbon dioxide flows into the heater.

17. The method according to claim 12, characterized in that The method further comprises: The mass spectrometer is used to detect the purity of the carbon dioxide gas discharged from the outlet of the test section.

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