A method for using a dynamic high-temperature high-pressure supercritical carbon dioxide corrosion test device

Abstract

The present application relates to the technical field of high temperature and high pressure corrosion test of materials, in particular to a use method of a dynamic high temperature and high pressure supercritical carbon dioxide corrosion test device. The dynamic high temperature and high pressure supercritical carbon dioxide corrosion test device is mainly composed of an ultrapure CO2 gas cylinder, a valve, a pressure reducing valve, a filter one, a supercritical fluid pump, a mass flow meter, a pressure gauge, a heat exchanger, a thermocouple, a preheater, an autoclave, a cooler, a cooling water valve, a cooling water pressure gauge, a circulating water cooler, a cooling water thermocouple, a back pressure valve, a gas treatment system, a control system and the like. The device can perform corrosion test on the sample under the condition of dynamic high temperature and high pressure supercritical CO2, and can record and accurately control important test parameters such as gas flow, temperature and pressure during the test, solving the problem of difficulty in carrying out uniform corrosion test of metal materials in dynamic high temperature and high pressure supercritical CO2.

Description

[0001] This application is a divisional application of a Chinese invention patent application. The original application was filed on August 8, 2022, with application number 202210946461.2 and invention title: Dynamic High Temperature and High Pressure Supercritical Carbon Dioxide Corrosion Test Device and its Usage Method. Technical Field

[0002] This invention relates to the field of high-temperature and high-pressure corrosion testing technology for materials, specifically a method for using a dynamic high-temperature and high-pressure supercritical carbon dioxide corrosion testing device. Background Technology

[0003] With continuous societal development and global population growth, energy shortages have become a primary threat to human development. Currently, fossil fuels such as coal, oil, and natural gas remain the main sources of energy for human production and daily life. However, given the rapid depletion of fossil fuel resources and the severe environmental damage caused by their large-scale combustion, such as the greenhouse effect and acid rain, finding new alternative energy sources has become a top priority for countries worldwide. Nuclear energy, as an economical, clean, safe, and efficient energy source, is receiving increasing attention from governments around the world.

[0004] Driven by market demand and continuous advancements in energy utilization and equipment manufacturing technologies, global power generation units are currently developing towards larger sizes and higher efficiency. However, the development of nuclear power units towards higher parameters, higher power, and higher efficiency faces significant technological bottlenecks. For example, when the power output of a single nuclear power unit exceeds 1700 MW, the height of its low-pressure cylinder's last-stage blades will exceed 1.8 m, and the swirling diameter will exceed 6 m. This results in an exceptionally large and complex generator unit, essentially reaching the strength and manufacturing limits of commonly used structural materials, making it difficult to further increase power output by improving intake parameters or increasing flow rate. Furthermore, after long-term research in aerodynamic theory and fluid loss theory, the aerodynamic design level of steam turbines has reached a very high level, making further improvements in flow efficiency extremely difficult. However, these bottlenecks can be overcome when using a Brayton cycle system with supercritical carbon dioxide as the working fluid.

[0005] However, current research is mostly focused on the effective modeling, analysis, and optimization of supercritical CO2 Brayton cycle systems, with very little research on the material safety of key structural materials in this service environment. Taking uniform corrosion as an example, as of 2019, only a few dozen articles on the corrosion of high-temperature supercritical CO2 materials had been published internationally, mainly concerning material selection, and these articles generally could not simultaneously achieve high temperature and high pressure. Domestically, there were only two review articles, with no experimental research articles. The difficulty of corrosion testing and the scarcity of data pose significant challenges to the selection of materials for components. Summary of the Invention

[0006] The purpose of this invention is to provide a method for using a dynamic high-temperature and high-pressure supercritical carbon dioxide corrosion testing device, thereby solving the problem of difficulty in conducting uniform corrosion testing in high-temperature and high-pressure supercritical CO2.

[0007] The technical solution of the present invention is as follows:

[0008] A dynamic high-temperature and high-pressure supercritical carbon dioxide corrosion test device is disclosed. An ultrapure CO2 gas cylinder extends from one side of a high-pressure vessel to the upper part of the vessel's inner cavity via a pipeline. The pipeline is sequentially equipped with a valve, a pressure reducing valve, a filter, a supercritical fluid pump, a mass flow meter, a pressure gauge, a thermocouple, a heat exchanger, a preheater, and a second thermocouple. The end of the pipeline entering the heat exchanger extends horizontally to the upper part of the heat exchanger's inner cavity and then bends downward, horizontally, and upward in sequence to extend beyond the upper end of the heat exchanger. Thermocouple 1 is installed on the inlet pipeline of the preheater, and thermocouple 2 is installed on the outlet pipeline of the preheater. The outlet pipeline of the preheater is connected to the high-pressure vessel.

[0009] The other side of the autoclave is connected to the gas processing system via a pipeline. The pipeline is sequentially equipped with pressure gauge 2, thermocouple 3, heat exchanger, thermocouple 4, cooler, thermocouple 5, filter 2, and back pressure valve. The pipeline enters the lower end of the heat exchanger and bends upward, horizontally, and downward in sequence to extend out of the lower end of the heat exchanger. Thermocouple 4 is installed on the inlet pipeline of the cooler, and thermocouple 5 is installed on the outlet pipeline of the cooler.

[0010] The aforementioned dynamic high-temperature and high-pressure supercritical carbon dioxide corrosion test apparatus comprises an autoclave and its internal components, including an autoclave cover (first part), an autoclave cover (second part), an autoclave body, an outlet, fastening bolts, an inlet, a temperature measuring tube, segmented thermocouples, a segmented temperature control heating device, partitions, and a sample. The specific structure is as follows:

[0011] The reactor body adopts a horizontal reactor structure. Two lids, lid one and lid two, are symmetrically arranged on both sides of the reactor body. Lid one, lid two, and the reactor body are connected by a lens-type seal using fastening bolts. An ultrapure CO2 gas cylinder extends from one side of the high-pressure reactor into the upper part of the reactor's inner cavity via a pipeline. An inlet is provided on the pipeline extending into the upper part of the reactor's inner cavity, connecting it to the reactor. A horizontal temperature measuring tube passes through one side of the high-pressure reactor and extends into the reactor's inner cavity. A segmented thermocouple is installed on the portion of the temperature measuring tube extending into the reactor's inner cavity. An outlet is located at the lower part of the other side of the high-pressure reactor, connected to a gas processing system via a pipeline. An annular segmented temperature control heating device is installed around the reactor body. A segmented thermocouple is installed at the corresponding position of the temperature measuring tube in each segmented temperature control heating device. The temperature measuring tube also serves as a sample support structure, suspending the spacers and samples. The samples are separated from each other by the spacers.

[0012] The aforementioned dynamic high-temperature and high-pressure supercritical carbon dioxide corrosion test device has a vessel body made of corrosion-resistant 625 nickel-based high-temperature alloy and baffles made of high-temperature resistant alumina or zirconium oxide ceramic.

[0013] The aforementioned dynamic high-temperature and high-pressure supercritical carbon dioxide corrosion test device uses a tubular heating structure for the preheater, and the pipeline connecting the preheater and the autoclave is insulated with thermal insulation cotton.

[0014] The aforementioned dynamic high-temperature and high-pressure supercritical carbon dioxide corrosion test device has a cooler connected to a circulating water cooler via an inlet pipe and an outlet pipe. The inlet pipe is equipped with a cooling water valve and a cooling water pressure gauge, and the outlet pipe is equipped with a cooling water thermocouple.

[0015] The aforementioned dynamic high-temperature and high-pressure supercritical carbon dioxide corrosion test device also includes a control system. The control system is equipped with a control cabinet switch, an emergency switch, a flow display, a computer one, a temperature display, a pressure display, and a computer two. Computer one in the control system is connected to the preheater, the segmented temperature control heating device of the autoclave, and computer two. Computer two is connected to thermocouple one, thermocouple two, thermocouple three, thermocouple four, thermocouple five, and the segmented thermocouples of the autoclave.

[0016] A method for using a dynamic high-temperature and high-pressure supercritical carbon dioxide corrosion testing device includes the following steps:

[0017] (1) Install the corrosion test sample, open the first and second lids on both sides of the high pressure vessel, and place the partition and sample on the temperature measuring tube in sequence.

[0018] (2) Tighten the fastening bolts at both ends of the pressure vessel to completely seal the pressure vessel;

[0019] (3) Introduce CO2, open the valve, and loosen the pressure reducing valve and back pressure valve;

[0020] (4) Open the cooling water valve to ensure that the cooling water pressure gauge and cooling water thermocouple are working properly and that the circulating cooling water operating parameters are normal;

[0021] (5) Turn on the supercritical fluid pump, adjust the back pressure valve and the parameters of the supercritical fluid pump, and adjust the flow and pressure parameters in conjunction with the flow and pressure displays of the control system.

[0022] (6) After setting the test temperature, turn on the preheater and the segmented temperature control heating device to heat the autoclave until the temperature stabilizes and the test begins.

[0023] (7) Use computer one and computer two to monitor, record and precisely control the pressure, flow and temperature parameters during the test in real time;

[0024] (8) After the test, the control system will automatically cut off the operation of the preheater and the segmented temperature control heating device according to the set test time, and the temperature of the high pressure vessel will decrease. When the temperature of the high pressure vessel is lower than 50 ℃, the supercritical fluid pump will be turned off, the back pressure valve switch will be loosened, and the pressure in the high pressure vessel will gradually decrease to normal pressure. Then, the circulating water cooler will be turned off, the first and second lids of the vessel will be opened, the sample will be taken out, and the test will end.

[0025] The method of using the dynamic high temperature and high pressure supercritical carbon dioxide corrosion test device is as follows: the preheater and the autoclave realize the supply and heating of CO2. The high temperature CO2 discharged from the autoclave passes through the heat exchanger, cooler, filter 2, back pressure valve and gas treatment system in sequence to realize the cooling, post-treatment and discharge of high temperature and high pressure CO2.

[0026] The design concept of this invention is:

[0027] This invention primarily provides an experimental apparatus for studying the uniform corrosion behavior of metallic materials in high-temperature, high-pressure supercritical carbon dioxide. The apparatus achieves a high-pressure environment through the combined action of a supercritical fluid pump and a back-pressure valve; a high-temperature environment through a segmented temperature-controlled feed device and a preheater in an autoclave; flow control through a mass flow meter; and various sensors and control systems connect these functional components to ultimately realize the various functions of the apparatus in this invention.

[0028] The advantages and beneficial effects of this invention are:

[0029] 1. The device of the present invention can realize real-time monitoring and control of parameters such as temperature, pressure and flow rate under high temperature and high pressure supercritical carbon dioxide medium, thereby accurately carrying out high temperature and high pressure supercritical carbon dioxide corrosion test under specific conditions. It has the characteristics of simple operation, good economy and high practicality.

[0030] 2. The control system of the device of the present invention can realize the real-time visualization monitoring of system parameters such as temperature, pressure, and flow rate, and is equipped with an abnormal alarm function. It has a high degree of automation and can be combined with a computer for automated control and protection.

[0031] 3. The device of the present invention can precisely adjust the pressure (0.1~25 MPa) inside the autoclave, and can heat CO2 from room temperature to 700 ℃ through the preheater and the four-stage heating and temperature control device inside the autoclave.

[0032] 4. The device of the present invention is equipped with a heat exchanger, which can not only preheat CO2 at room temperature, but also cool the discharged CO2, resulting in high thermal efficiency and good economy.

[0033] 5. The air inlet of the device of the present invention is provided with six sub-air inlets, which makes the air intake more uniform and ensures that the ultrapure CO2 is more evenly distributed in different positions in the autoclave. It has good effect, is simple to implement and convenient to operate.

[0034] 6. The pressure vessel heating device of the present invention adopts a four-stage heating and temperature control design, which improves the temperature uniformity inside the pressure vessel, and corresponding thermocouples are provided in each heating and temperature control stage to realize real-time monitoring of the temperature at different locations inside the pressure vessel.

[0035] 7. The device of the present invention is equipped with a filter and a gas treatment system, which improves the long-term operational stability of the system and is more environmentally friendly.

[0036] 8. The device of the present invention can meet the requirement of simultaneous testing of multiple groups of samples, and separates the samples from each other by means of inert spacers to avoid the generation of galvanic couples. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the dynamic high-temperature and high-pressure supercritical carbon dioxide corrosion test device of the present invention. In the diagram, 1 is an ultrapure CO2 cylinder; 2 is a valve; 3 is a pressure reducing valve; 4 is a filter one; 5 is a supercritical fluid pump; 6 is a mass flow meter; 7 is a pressure gauge one; 8 is a heat exchanger; 9 is a thermocouple one; 10 is a preheater; 11 is a thermocouple two; 12 is a high-pressure vessel; 13 is a pressure gauge two; 14 is a thermocouple three; 15 is a thermocouple four; 16 is a cooler; 17 is a cooling water valve; 18 is a cooling water pressure gauge; 19 is a circulating water cooler; 20 is a cooling water thermocouple; 21 is a thermocouple five; 22 is a filter two; 23 is a back pressure valve; 24 is a gas processing system; 25 is a control system; 251 is a control cabinet switch; 252 is an emergency switch; 253 is a flow display; 254 is a computer one; 255 is a temperature display; 256 is a pressure display; and 257 is a computer two.

[0038] Figure 2 for Figure 1 Schematic diagram of the structure of the medium-pressure autoclave 12. In the diagram, 121 autoclave cover one; 122 autoclave cover two; 123 autoclave body; 124 air outlet; 125 fastening bolt; 126 air inlet; 127 temperature measuring tube; 128 segmented thermocouple; 129 segmented temperature control heating device; 1210 partition; 1211 sample; 13 pressure gauge two. Detailed Implementation

[0039] like Figures 1-2As shown, the dynamic high-temperature and high-pressure supercritical carbon dioxide corrosion test device of the present invention mainly consists of an ultrapure CO2 cylinder 1, a valve 2, a pressure reducing valve 3, a filter 4, a supercritical fluid pump 5, a mass flow meter 6, a pressure gauge 7, a heat exchanger 8, a thermocouple 9, a preheater 10, a thermocouple 11, a high-pressure vessel 12, a pressure gauge 13, a thermocouple 3, a thermocouple 4, a cooler 16, a cooling water valve 17, a cooling water pressure gauge 18, a circulating water cooler 19, a cooling water thermocouple 20, a thermocouple 5 21, a filter 22, a back pressure valve 23, a gas processing system 24, and a control system 25, etc., with the specific structure as follows:

[0040] An ultrapure CO2 cylinder 1 extends from one side of the autoclave 12 through a pipeline to the upper part of the autoclave 12's inner cavity. The pipeline is sequentially equipped with a valve 2, a pressure reducing valve 3, a filter 4, a supercritical fluid pump 5, a mass flow meter 6, a pressure gauge 7, a thermocouple 9, a heat exchanger 8, a preheater 10, and a second thermocouple 11, enabling CO2 supply and heating. The end of the pipeline entering the heat exchanger 8 extends horizontally to the upper part of the heat exchanger 8's inner cavity and then bends downwards, horizontally, and upwards, extending beyond the upper end of the heat exchanger 8. The preheater 10 uses tubular heating; thermocouple 9 is installed on the inlet pipeline of the preheater 10, and thermocouple 11 is installed on the outlet pipeline of the preheater 10, monitoring the CO2 temperature entering the autoclave 12 in real time. The outlet pipeline of the preheater 10 connects to the autoclave 12, and the pipeline connecting the preheater 10 and the autoclave 12 is insulated with thermal insulation cotton. In addition, the supercritical fluid pump 5 can set the flow rate of CO2 in the sample device inside the autoclave 12.

[0041] An air inlet 126 is opened in the pipeline extending to the upper part of the inner cavity of the pressure vessel 12 and communicates with the pressure vessel 12. An air outlet 124 is provided on the lower part of the other side of the pressure vessel 12. The air outlet 124 is connected to the gas processing system 24 through a pipeline. The pipeline is sequentially equipped with a pressure gauge 13, a thermocouple 14, a heat exchanger 8, a thermocouple 15, a cooler 16, a thermocouple 21, a filter 22, and a back pressure valve 23. The pipeline enters the lower end of the heat exchanger 8 and bends upward, horizontally, and downward in sequence to extend out of the lower end of the heat exchanger 8. The heat exchanger 8 exchanges heat between ultrapure (volume purity 99.999%) room temperature CO2 and CO2 discharged from the pressure vessel 12. It can not only preheat the room temperature CO2, but also cool the discharged CO2. Thermocouple 4 15 is installed on the inlet pipe of cooler 16, and thermocouple 5 21 is installed on the outlet pipe of cooler 16. Cooler 16 is connected to circulating water cooler 19 through inlet and outlet pipes. Cooling water valve 17 and cooling water pressure gauge 18 are installed on the inlet pipe, and cooling water thermocouple 20 is installed on the outlet pipe. These devices cool the high-temperature, high-pressure supercritical CO2 discharged from autoclave 12 and monitor the temperature and pressure in the cooling water circuit. Filter 22 filters the gas in the pipeline to remove impurities, and back pressure valve 23 can precisely adjust the pressure in autoclave 12 from 0.1 to 25 MPa. The high-temperature CO2 discharged from autoclave 12 passes sequentially through heat exchanger 8, cooler 16, filter 22, back pressure valve 23, and gas treatment system 24, achieving cooling, post-treatment, and discharge of the high-temperature, high-pressure CO2.

[0042] The control system 25 is equipped with a control cabinet switch 251, an emergency switch 252, a flow display 253, a computer 254, a temperature display 255, a pressure display 256, and a computer 257, enabling dynamic monitoring and control of temperature and pressure at various nodes within the system and protecting the entire system. Computer 254 in the control system 25 is connected to the preheater 10, the segmented temperature control heating device 129 of the autoclave 12, the control cabinet switch 251, the emergency switch 252, the flow display 253, and computer 257, and is mainly responsible for monitoring and segmenting the CO2 flow at the inlet. The system includes heating and temperature control, system start / stop, and emergency protection control, with functions such as abnormal flow rate alarm, abnormal temperature rise alarm, over-temperature alarm, and over-pressure / under-pressure alarm. The computer 257 in the control system 25 is connected to thermocouple 9, thermocouple 11, thermocouple 3 14, thermocouple 4 15, thermocouple 5 21, the segmented thermocouple 128 of the autoclave 12, temperature display 255, and pressure display 256. It is mainly responsible for monitoring the temperature and pressure within the system and can save the system's operating parameters such as temperature, pressure, and flow rate. Some parameters and recorded curves are displayed in real time through the control interface.

[0043] like Figure 2As shown, the autoclave 12 and its internal components mainly consist of a first autoclave cover 121, a second autoclave cover 122, an autoclave body 123, an outlet 124, fastening bolts 125, an inlet 126, a temperature measuring tube 127, a segmented thermocouple 128, a segmented temperature control heating device 129, a partition 1210, and a sample 1211. The specific structure is as follows:

[0044] The vessel body 123 is symmetrically provided with vessel cover 121 and vessel cover 122 on both sides. The vessel cover 121, vessel cover 122 and vessel body 123 are mainly connected by lens-type (convex and concave fit) sealing connection through fastening bolts 125 to ensure that no leakage occurs when subjected to high temperature and high pressure gas.

[0045] An ultrapure CO2 cylinder 1 extends from one side of the pressure vessel 12 through a pipeline to the upper part of the inner cavity of the pressure vessel 12. The pipeline extending to the upper part of the inner cavity of the pressure vessel 12 has an air inlet 126 that communicates with the pressure vessel 12. The air inlet 126 has 6 sub-inlets, which can effectively improve the uniformity of air intake. A horizontal temperature measuring tube 127 passes through one side of the pressure vessel 12 and extends into the inner cavity of the pressure vessel 12. A segmented thermocouple 128 is installed on the part of the temperature measuring tube 127 that extends into the inner cavity of the pressure vessel 12.

[0046] The vessel body 123 is made of corrosion-resistant 625 nickel-based high-temperature alloy and adopts a horizontal reactor design. The vessel body 123 is surrounded by four annular segmented temperature control heating devices 129, which can effectively improve the temperature uniformity inside the high pressure vessel 12 and ensure the repeatability of test results. The temperature control range of the high pressure vessel 12 is 150~700℃. The temperature measuring tube 127 is equipped with four segmented thermocouples 128 at the corresponding positions of each segmented temperature control heating device 129, which accurately measure the temperature of the corresponding positions inside the high pressure vessel 12 and provide feedback to adjust the heating power of the four segmented temperature control heating devices 129 to achieve uniform temperature inside the high pressure vessel 12.

[0047] The temperature measuring tube 127 can also serve as a sample support structure for suspending the spacer 1210 and the sample 1211. The spacer 1210 is made of high-temperature resistant alumina or zirconia ceramic, which separates the samples 1211 from each other to ensure that the samples do not come into contact with each other during the corrosion test.

[0048] like Figures 1-2 As shown, the method of using the dynamic high-temperature and high-pressure supercritical CO2 corrosion test device of the present invention is as follows:

[0049] (1) Install the corrosion test sample, open the lids on both sides of the high pressure vessel 12 (lid 121 and lid 2 122), and place the partition 1210 and the sample 1211 on the temperature measuring tube 127 in sequence.

[0050] (2) Tighten the fastening bolts 125 at both ends of the pressure vessel 12 to completely seal the pressure vessel 12.

[0051] (3) Introduce CO2, open valve 2, and loosen pressure reducing valve 3 and back pressure valve 23.

[0052] (4) Open the cooling water valve 17 to ensure that the cooling water pressure gauge 18 and the cooling water thermocouple 20 are working properly and that the circulating cooling water operating parameters are normal.

[0053] (5) Turn on the supercritical fluid pump 5, adjust the back pressure valve 23 and the parameters of the supercritical fluid pump 5, and adjust the flow and pressure parameters in conjunction with the flow display 253 and pressure display 256 of the control system 25.

[0054] (6) After setting the test temperature, turn on the preheater 10 and the segmented temperature control heating device 129 to heat up the autoclave 12 until the temperature stabilizes and the test begins.

[0055] (7) Use computer 1254 and computer 2257 to monitor, record and precisely control parameters such as pressure, flow rate and temperature during the test process in real time.

[0056] (8) After the test, according to the set test time, the control system 25 will automatically cut off the operation of the preheater 10 and the segmented temperature control heating device 129, and the temperature of the autoclave 12 will decrease. When the temperature of the autoclave 12 is below 50 ℃, the supercritical fluid pump 5 will be turned off, the back pressure valve 23 will be slowly loosened, and the pressure in the autoclave 12 will gradually decrease to atmospheric pressure. Then, the circulating water cooler 19 will be turned off, the first autoclave cover 121 and the second autoclave cover 122 will be opened, the sample 1211 will be taken out, and the test will end.

[0057] The results of the examples show that the present invention can perform corrosion tests on samples under dynamic high temperature and high pressure supercritical CO2 conditions, and can record and precisely control important test parameters such as gas flow rate, temperature and pressure during the test.

Claims

1. A method for using a dynamic high-temperature and high-pressure supercritical carbon dioxide corrosion testing device, characterized in that, Includes the following steps: (1) Install the corrosion test sample, open the first and second lids on both sides of the high pressure vessel, and place the partition and sample on the temperature measuring tube in sequence. (2) Tighten the fastening bolts at both ends of the pressure vessel to completely seal the pressure vessel; (3) Introduce CO2, open the valve, and loosen the pressure reducing valve and back pressure valve; (4) Open the cooling water valve to ensure that the cooling water pressure gauge and cooling water thermocouple are working properly and that the circulating cooling water operating parameters are normal; (5) Turn on the supercritical fluid pump, adjust the back pressure valve and the parameters of the supercritical fluid pump, and adjust the flow and pressure parameters in conjunction with the flow and pressure displays of the control system. (6) After setting the test temperature, turn on the preheater and the segmented temperature control heating device to heat the autoclave until the temperature stabilizes and the test begins. (7) Use computer one and computer two to monitor, record and precisely control the pressure, flow and temperature parameters during the test in real time; (8) After the test, according to the set test time, the control system will automatically cut off the operation of the preheater and the segmented temperature control heating device, and the temperature of the autoclave will decrease; when the temperature of the autoclave is below 50 ℃, turn off the supercritical fluid pump, loosen the back pressure valve switch, and after the pressure in the autoclave gradually decreases to atmospheric pressure, turn off the circulating water cooler, open the first and second autoclave lids, take out the sample, and the test ends. The structure of the dynamic high-temperature and high-pressure supercritical carbon dioxide corrosion test apparatus is as follows: An ultrapure CO2 cylinder extends from one side of the autoclave to the upper part of the autoclave's inner cavity via a pipeline. The pipeline is sequentially equipped with a valve, a pressure reducing valve, a first filter, a supercritical fluid pump, a mass flow meter, a first pressure gauge, a first thermocouple, a heat exchanger, a preheater, and a second thermocouple. One end of the pipeline enters the heat exchanger and extends horizontally to the upper part of the heat exchanger's inner cavity, then bends downwards, horizontally, and upwards sequentially to extend beyond the upper end of the heat exchanger. Thermocouple one is installed on the inlet pipeline of the preheater, and thermocouple two is installed on the outlet pipeline of the preheater. The outlet pipeline of the preheater is connected to the autoclave. The other side of the autoclave is connected to the gas processing system via a pipeline. The pipeline is sequentially equipped with pressure gauge 2, thermocouple 3, heat exchanger, thermocouple 4, cooler, thermocouple 5, filter 2, and back pressure valve. The pipeline enters the lower end of the heat exchanger and bends upward, horizontally, and downward in sequence to extend out of the lower end of the heat exchanger. Thermocouple 4 is installed on the inlet pipeline of the cooler, and thermocouple 5 is installed on the outlet pipeline of the cooler. The autoclave and its internal components consist of one lid, two lids, the vessel body, an outlet, fastening bolts, an inlet, a temperature measuring tube, a segmented thermocouple, a segmented temperature control heating device, a partition, and a sample. The specific structure is as follows: The reactor body adopts a horizontal reactor structure. Two lids, lid one and lid two, are symmetrically arranged on both sides of the reactor body. Lid one, lid two, and the reactor body are connected by a lens-type seal using fastening bolts. An ultrapure CO2 gas cylinder extends from one side of the high-pressure reactor to the upper part of the reactor's inner cavity via a pipeline. An inlet is provided on the pipeline extending to the upper part of the reactor's inner cavity, connecting it to the reactor. A horizontal temperature measuring tube passes through one side of the high-pressure reactor and extends into the reactor's inner cavity. A segmented thermocouple is installed on the portion of the temperature measuring tube extending into the reactor's inner cavity. An outlet is located at the lower part of the other side of the high-pressure reactor, connected to a gas processing system via a pipeline. An annular segmented temperature control heating device is installed around the reactor body. A segmented thermocouple is installed at the corresponding position of the temperature measuring tube in each segmented temperature control heating device. The temperature measuring tube also serves as a sample support structure, suspending the spacers and samples. The samples are separated from each other by the spacers. The control system is equipped with a control cabinet switch, an emergency switch, a flow display, a computer 1, a temperature display, a pressure display, and a computer 2. Computer 1 in the control system is connected to the preheater, the segmented temperature control heating device of the autoclave, and computer 2. Computer 2 is connected to thermocouple 1, thermocouple 2, thermocouple 3, thermocouple 4, thermocouple 5, and the segmented thermocouples of the autoclave.

2. The method of using the dynamic high-temperature and high-pressure supercritical carbon dioxide corrosion testing device according to claim 1, characterized in that, The preheater adopts a tubular heating structure, and the pipeline connecting the preheater and the autoclave is insulated with thermal insulation cotton.

3. The method of using the dynamic high-temperature and high-pressure supercritical carbon dioxide corrosion testing device according to claim 1, characterized in that, The preheater and autoclave supply and heat CO2. The high-temperature CO2 discharged from the autoclave passes through the heat exchanger, cooler, filter 2, back pressure valve and gas treatment system in sequence to achieve cooling, post-treatment and discharge of high-temperature and high-pressure CO2.

4. The method of using the dynamic high-temperature and high-pressure supercritical carbon dioxide corrosion testing device according to claim 1, characterized in that, The vessel body is made of corrosion-resistant 625 nickel-based high-temperature alloy, and the partition is made of high-temperature resistant alumina or zirconium oxide ceramic.

5. The method of using the dynamic high-temperature and high-pressure supercritical carbon dioxide corrosion testing device according to claim 1, characterized in that, The cooler is connected to the circulating water cooler through an inlet pipe and an outlet pipe. The inlet pipe is equipped with a cooling water valve and a cooling water pressure gauge, and the outlet pipe is equipped with a cooling water thermocouple.

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