Supercritical co 2 corrosion test system and test method therefor

Abstract

A supercritical CO2 corrosion test system and a test method therefor. The supercritical CO2 corrosion test system comprises: a sample loading device (1), a pressure regulating valve (80), and an auxiliary pressure regulating member (90). The sample loading device (1) is configured to have a sample chamber (10) for arranging samples (50), and the sample chamber (10) is also used for receiving a supercritical CO2 fluid, so that the samples (50) in the sample chamber (10) undergo a corrosion test in a supercritical CO2 atmosphere. The pressure regulating valve (80) is arranged downstream of the sample chamber (10) in the flow direction of the supercritical CO2 fluid, and is used for regulating the pressure of the sample chamber (10), so that the samples (50) in the sample chamber (10) undergo the test under a first preset pressure. The auxiliary pressure regulating member (90) is used for increasing the pressure at an outlet of the pressure regulating valve (80). By arranging the auxiliary pressure regulating member (90), the pressure difference between an inlet and the outlet of the pressure regulating valve (80) is reduced, which facilitates achieving precise regulation of the pressure of the sample chamber (10) by the pressure regulating valve (80).

Description

Supercritical CO2 corrosion test system and test methods Technical Field

[0001] The embodiments of this application relate to the technical field of testing the corrosion resistance of materials, specifically to a supercritical CO2 corrosion testing system and its testing method. Background Technology

[0002] The statements herein are provided merely as background information in connection with this application and do not necessarily constitute prior art.

[0003] Supercritical carbon dioxide (S-CO2) Brayton power conversion systems represent a new generation of power generation technology. In nuclear power conversion systems, supercritical CO2 typically exhibits characteristics such as high temperature, high pressure, and high flow rate, which can corrode materials and consequently affect the safe and efficient operation of equipment. Conducting supercritical CO2 corrosion tests on materials can provide valuable information for material selection. Appropriate material selection can effectively control the construction costs of reactor equipment; therefore, conducting supercritical CO2 corrosion tests on materials is of great significance.

[0004] Currently, supercritical CO2 corrosion testing systems exist for conducting supercritical CO2 corrosion tests on materials. However, current supercritical CO2 corrosion testing systems typically struggle to precisely control the pressure within the sample chamber. Summary of the Invention

[0005] A brief overview of this application is provided below to offer a basic understanding of certain aspects thereof. It should be understood that this overview is not an exhaustive summary of the application. It is not intended to identify key or essential parts of the application, nor is it intended to limit its scope. Its purpose is merely to present certain concepts in a simplified form as a prelude to the more detailed description that follows.

[0006] In a first aspect, embodiments of this application provide a supercritical CO2 corrosion testing system, comprising: a sample loading device configured to have a sample chamber for arranging a sample, the sample chamber also being used to receive supercritical CO2 fluid, so that the sample in the sample chamber is subjected to a corrosion test under a supercritical CO2 atmosphere; a pressure regulating valve disposed downstream of the sample chamber along the flow direction of the supercritical CO2 fluid, for regulating the pressure of the sample chamber, so that the sample in the sample chamber is tested at a first preset pressure; and an auxiliary pressure regulating component for increasing the pressure at the outlet of the pressure regulating valve.

[0007] Secondly, embodiments of this application provide a supercritical CO2 corrosion test method, which employs the system of the first aspect of this application. The method includes: introducing supercritical CO2 into a sample chamber, wherein the supercritical CO2 flows sequentially through the sample chamber, a pressure regulating valve, and an auxiliary pressure regulating component before being introduced into the atmospheric environment; adjusting the pressure regulating valve to make the pressure in the sample chamber a first preset pressure; adjusting the auxiliary pressure regulating component to make the pressure at the outlet of the pressure regulating valve a second preset pressure, wherein the second preset pressure is less than the first preset pressure but greater than atmospheric pressure; and then performing a supercritical CO2 corrosion test.

[0008] The embodiments of this application increase the pressure at the outlet of the pressure regulating valve by setting an auxiliary pressure regulating component, thereby reducing the pressure difference between the inlet and outlet of the pressure regulating valve. This avoids a rapid cooling of the pressure regulating valve due to the vaporization phase change of supercritical CO2 at the pressure regulating valve, thus helping to ensure the precise control of the sample chamber pressure by the pressure regulating valve. Attached Figure Description

[0009] Other objects and advantages of this application will become apparent from the following description of embodiments of this application with reference to the accompanying drawings, and will help to provide a comprehensive understanding of this application.

[0010] Figure 1 is a schematic diagram of a supercritical CO2 corrosion test system according to an embodiment of the present invention.

[0011] Figure 2 is a cross-sectional schematic diagram of a sample loading device according to an embodiment of the present application.

[0012] Figure 3 is a partially enlarged schematic diagram of the sample chamber of the sample loading device in Figure 2.

[0013] Figure 4 is a cross-sectional schematic diagram of a sample holding assembly according to an embodiment of the present application.

[0014] Figure 5 is an exploded schematic diagram of a sample holding assembly according to an embodiment of this application.

[0015] Figure 6 is a top view of a retainer according to an embodiment of the present application.

[0016] Figure 7 is a structural schematic diagram of the pressure regulating valve and auxiliary pressure regulating components.

[0017] Explanation of reference numerals in the attached drawings: 1. Sample loading device; 10. Sample chamber; 20. Air inlet; 30. Air outlet; 40. Sample holding assembly; 41. Holding member; 411. Positioning groove group; 4111. Positioning groove; 41111. Middle groove area; 41112. End groove area; 412. Core; 413. Extension; 414. Central mounting hole; 415. Outer mounting hole of the holding member; 42. Connecting assembly; 421. Connecting kit; 4211. Kit body; 4212. Snap-fit ​​part; 422. Connecting mating part; 423. Fastener; 424. Pad; 4241. Pad mounting hole; 425. Connector; 50. Sample; 60. Rotation drive component; 61. Rotating shaft; 611. Rotating shaft interface; 62. Rotating drum; 621. Magnet; 622. Connecting cylinder; 63. Rotating drum cooling component; 64. Rotating shaft cooling component; 641. First cooling connection part; 642. Second cooling connection part; 643. Cooling body; 65. Drive mounting component; 66. Spacer; 661. First connection part; 662. Second connection part; 67. Drive component; 68. Bearing; 70. Body; 701. Groove; 71. Cover; 711. Through hole; 72. Fixing component; 73. Stabilizing sample tank; 74. Fastener; 80. Pressure regulating valve; 81. First temperature measuring component; 82. First electric heating component; 90. Auxiliary pressure regulating component; 91. Auxiliary pressure regulating valve; 92. Pressure stabilizing container; 93. Pressure measuring component; 94. Auxiliary temperature measuring component; 95. Auxiliary electric heating component; 101. Carbon dioxide supply unit; 102. Gas source valve; 103. Displacement valve; 104. First pressure measuring device; 105. Pre-cooling device; 106. Cold water supply unit; 107. Filter device; 110. Inlet pipe; 121. Booster pump; 122. Valve; 123. Second pressure measuring device; 124. Check valve; 131. Preheating device; 132. Temperature control device; 141. Cooling device; 142. Second temperature measuring device; 143. Third pressure measuring device; 144. Exhaust valve; 145. Rupture disc; 146. Vent valve; 1001. Mounting plate; 1002. First mounting bracket; 1003. Second mounting bracket; 1004. T-junction; 1005. Pressure stabilizing heating device.

[0018] It should be noted that the accompanying drawings are not necessarily drawn to scale, but are shown only in a schematic manner without affecting the reader's understanding. Detailed Implementation

[0019] Exemplary embodiments of this application will be described below with reference to the accompanying drawings. For clarity and brevity, not all features of actual implementations are described in the specification. However, it should be understood that many implementation-specific decisions must be made in the development of any such actual embodiment to achieve the developer's specific goals, such as complying with constraints related to the system and business, and these constraints may vary depending on the implementation. Furthermore, it should be understood that while development work can be very complex and time-consuming, such development work is merely a routine task for those skilled in the art who benefit from the content of this application.

[0020] It should also be noted that, in order to avoid obscuring this application with unnecessary details, only the equipment structure and / or processing steps closely related to the solution according to this application are shown in the accompanying drawings, while other details that are not closely related to this application are omitted.

[0021] It should be noted that, unless otherwise defined, the technical or scientific terms used in this application shall have the ordinary meaning as understood by a person with ordinary skills in the field to which this application pertains.

[0022] In the description of the embodiments of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0023] In order to achieve high-pressure conditions in the sample chamber, the high-flow-rate supercritical CO2 corrosion test system in related technologies usually has a pressure regulating valve (such as a back pressure valve) installed downstream of the sample chamber. The pressure in the sample chamber is regulated by the pressure regulating valve so that the sample chamber is maintained under high pressure conditions.

[0024] The CO2 gas flowing out of the pressure regulating valve flows directly into the atmosphere. The inventors of this application discovered that the pressure on one side of the pressure regulating valve is the same as that of the atmosphere, while the other side maintains a pressure as high as 25 MPa. Due to the sudden drop in CO2 pressure inside the valve, CO2 undergoes a phase change from liquid to gas, absorbing a large amount of heat, which causes the valve temperature to drop sharply and easily freeze. This results in the pressure regulating valve not being able to accurately regulate the pressure in the sample chamber.

[0025] In related technologies, to solve the above problems, an electric heating element is used to heat the pressure regulating valve to prevent it from freezing. The inventors of this application have discovered that the pressure regulating valve cools down very quickly, while the electric heating element has a slow heating rate and slow response speed, making it difficult to provide enough heat in a short time to prevent the pressure regulating valve from experiencing a sudden temperature drop.

[0026] Based on this, embodiments of this application provide a supercritical CO2 corrosion testing system. Figure 1 is a schematic diagram of the principle of a supercritical CO2 corrosion testing system according to an embodiment of the present invention. As shown in Figure 1, the supercritical CO2 corrosion testing system includes: a sample loading device 1, a pressure regulating valve 80, and an auxiliary pressure regulating component 90. The sample loading device 1 is configured to have a sample chamber 10 for arranging a sample 50, and the sample chamber 10 is also used to receive supercritical CO2 fluid so that the sample 50 in the sample chamber 10 is subjected to corrosion testing under a supercritical CO2 atmosphere. The pressure regulating valve 80 is disposed downstream of the sample chamber 10 along the flow direction of the supercritical CO2 fluid, and is used to regulate the pressure of the sample chamber 10 so that the sample 50 in the sample chamber 10 is tested at a first preset pressure. The auxiliary pressure regulating component 90 is used to increase the pressure at the outlet of the pressure regulating valve 80.

[0027] The embodiments of this application increase the pressure at the outlet of the pressure regulating valve 80 by setting an auxiliary pressure regulating component 90, thereby reducing the pressure difference between the inlet and outlet of the pressure regulating valve 80. This avoids a rapid drop in temperature of the pressure regulating valve 80 due to the vaporization phase change of supercritical CO2 at the pressure regulating valve 80, thus helping to ensure the precise control of the pressure of the sample chamber 10 by the pressure regulating valve 80.

[0028] As shown in Figure 1, the auxiliary pressure regulating component 90 includes an auxiliary pressure regulating valve 91 (such as a back pressure valve). The auxiliary pressure regulating valve 91 is positioned downstream of the pressure regulating valve 80 along the flow direction of the supercritical CO2 fluid. The supercritical CO2 fluid from the outlet of the pressure regulating valve 80 flows to the inlet of the auxiliary pressure regulating valve 91 and then flows from the outlet of the auxiliary pressure regulating valve 91 to the atmospheric environment. The auxiliary pressure regulating valve 91 is configured to regulate the pressure on the inlet side of the auxiliary pressure regulating valve 91 (i.e., the outlet side of the pressure regulating valve 80) to a second preset pressure, which is less than a first preset pressure but greater than atmospheric pressure.

[0029] The auxiliary pressure regulating valve 91 reduces the pressure difference between the inlet and outlet of the pressure regulating valve 80 by adjusting the pressure at the outlet of the pressure regulating valve 80 to a second preset pressure greater than atmospheric pressure.

[0030] Supercritical CO2 fluid flows to the atmosphere from the outlet of auxiliary pressure regulating valve 91.

[0031] As shown in Figure 1, the auxiliary pressure regulating component 90 also includes a pressure stabilizing container 92. The pressure stabilizing container 92 is disposed in the flow path between the pressure regulating valve 80 and the auxiliary pressure regulating valve 91, which regulates the pressure within the pressure stabilizing container 92. The presence of the pressure stabilizing container 92 facilitates pressure regulation by the auxiliary pressure regulating valve 91.

[0032] In some embodiments, the pressure stabilizing vessel 92 can be a pressure vessel with a pressure rating of 20 MPa or higher.

[0033] In some embodiments, as shown in FIG1, the auxiliary pressure regulating member 90 further includes a pressure measuring member 93. The pressure measuring member 93 is disposed in the flow path between the pressure stabilizing vessel 92 and the auxiliary pressure regulating valve 91, and is used to measure the pressure at the inlet of the auxiliary pressure regulating valve 91, so as to adjust the opening degree of the auxiliary pressure regulating valve 91 according to the pressure measured by the pressure measuring member 93.

[0034] In some embodiments, as shown in FIG1, the auxiliary pressure regulating component 90 further includes an auxiliary temperature measuring component 94 and an auxiliary electric heating component 95. The auxiliary temperature measuring component 94 is used to measure the temperature of the auxiliary pressure regulating valve 91. The auxiliary electric heating component 95 heats the auxiliary pressure regulating valve 91 according to the temperature measured by the auxiliary temperature measuring component 94, so as to heat the temperature of the auxiliary pressure regulating valve 91 to a preset temperature.

[0035] The temperature of the pressure regulating valve 80 measured by the auxiliary temperature measuring element 94, along with the preset temperature, serves as the basis for the auxiliary electric heating element 95 to heat the auxiliary pressure regulating valve 91. This setting helps maintain the temperature of the auxiliary pressure regulating valve 91 at the preset temperature, resulting in better pressure regulation. Even if a supercritical CO2 vaporization phase change occurs within the auxiliary pressure regulating valve 91 (if a supercritical CO2 vaporization phase change occurs), the temperature of the auxiliary pressure regulating valve 91 can be slowly restored by providing heat. Since the auxiliary temperature measuring element 94 regulates the pressure on the inlet side of the auxiliary pressure regulating valve 91, this pressure does not need to be particularly precise. Even if a supercritical CO2 vaporization phase change occurs within the auxiliary pressure regulating valve 91, causing the auxiliary pressure regulating valve 91 to freeze, it will not affect the effect of the auxiliary temperature measuring element 94 regulating the pressure on the inlet side of the auxiliary pressure regulating valve 91.

[0036] As shown in Figure 1, the supercritical CO2 corrosion test system further includes a first temperature measuring element 81 and a first electric heating element 82. The first temperature measuring element 81 is used to measure the temperature of the pressure regulating valve 80. The first electric heating element 82 heats the pressure regulating valve 80 according to the temperature measured by the first temperature measuring element 81, so as to heat the temperature of the pressure regulating valve 80 to a preset temperature. In the embodiments of this application, by setting an auxiliary pressure regulating element 90, the pressure difference between the inlet and outlet of the pressure regulating valve 80 is reduced, avoiding the occurrence of phase change inside and the sudden drop in temperature leading to icing; when the temperature inside the pressure regulating valve 80 drops slightly due to the pressure drop of the supercritical CO2 fluid, the first temperature measuring element 81 and the first electric heating element 82 help to maintain the temperature of the pressure regulating valve 80 at the preset temperature, so that the pressure regulating valve 80 can better regulate the pressure of the sample chamber 10.

[0037] In some embodiments, the preset temperature can be higher than room temperature to ensure the pressure regulation effect of the pressure regulating valve 80 and the auxiliary pressure regulating element 90. For example, the preset temperature can be 30-50°C.

[0038] In some embodiments, the second preset pressure can be greater than the saturated vapor pressure of CO2 at room temperature. At room temperature (20°C), the saturated vapor pressure of carbon dioxide is approximately 5 MPa. When the second preset pressure is greater than the saturated vapor pressure of CO2 at room temperature, the vaporization of CO2 inside the pressure regulating valve 80 is not intense, and correspondingly, the heat absorption is not intense, thus preventing a sudden drop in temperature and icing.

[0039] Therefore, when the first electric heating element 82 heats the pressure regulating valve 80 to the preset temperature, the auxiliary pressure regulating valve 91 adjusts the pressure at the outlet of the pressure regulating valve 80 to above 5MPa, which can effectively prevent the pressure regulating valve 80 from freezing due to excessively low temperature and ensure the accurate regulation of the pressure in the sample chamber 10 by the pressure regulating valve 80.

[0040] Tests revealed that without using the auxiliary pressure regulating valve 91 to increase the outlet pressure of the pressure regulating valve 80, the pressure regulation accuracy of the pressure regulating valve 80 was ±1 MPa. When the auxiliary pressure regulating valve 91 was used to increase the outlet pressure of the pressure regulating valve 80, the pressure regulation accuracy reached ±0.5 MPa. Therefore, this application improves the pressure regulation accuracy of the pressure regulating valve 80 by incorporating the auxiliary pressure regulating valve 91.

[0041] In some embodiments, the supercritical CO2 corrosion test system further includes a carbon dioxide supply component 101, an air inlet pipe 110, a precooling component 105, a booster pump 121, a preheating component 131, and a cooling component 141.

[0042] The intake pipe 110 is connected to the intake port 20. The carbon dioxide supply unit 101 is used to supply gaseous carbon dioxide to the intake pipe 110, allowing gaseous carbon dioxide to enter the intake pipe 110. A booster pump 121, a precooling unit 105, a preheating unit 131, and a cooling unit 141 are respectively installed in the intake pipe 110. The carbon dioxide supply unit 101 can be a carbon dioxide cylinder. The intake pipe 110 is a high-pressure pipe.

[0043] The booster pump 121 is used to pressurize the liquid carbon dioxide in the intake pipe 110 to the test pressure of the supercritical CO2 corrosion test, so as to provide the high-pressure supercritical CO2 required for the test. Since the booster pump 121 can only drive liquid carbon dioxide, a pre-cooling component 105 is provided upstream of the booster pump 121. The pre-cooling component 105 is used to reduce the temperature of the carbon dioxide in the intake pipe 110, so as to liquefy the gaseous carbon dioxide so that it can be driven by the booster pump 121.

[0044] The preheating element 131 is located downstream of the booster pump 121 and is used to preheat the supercritical CO2 to a test temperature similar to that required for the supercritical CO2 corrosion test, providing the high-temperature, high-pressure supercritical CO2 needed for the test, for example, 600°C. After preheating, the high-temperature, high-pressure supercritical CO2 enters the sample chamber 10, where it is further heated to the test temperature and flows out of the sample chamber 10 after passing through the sample 50. The preheating element 131 can be an electrically heated element.

[0045] Cooling element 141 is installed in the downstream pipeline of sample chamber 10 to cool the high-temperature supercritical CO2 to below 40°C to avoid adverse effects on downstream valves. The supercritical CO2 flowing out of cooling element 141 sequentially enters pressure regulating valve 80, pressure stabilizing container 92 and auxiliary pressure regulating element 90 before entering the atmospheric environment.

[0046] In some embodiments, an air source valve 102 is also provided in the air intake pipe 110, and the supply and interruption of gaseous carbon dioxide are realized by opening and closing the air source valve 102.

[0047] In some embodiments, the supercritical CO2 corrosion test system further includes a displacement valve 103, which is disposed in a pipeline connected in parallel with the air inlet pipeline 110 and is used to displace air impurities introduced during the replacement of the carbon dioxide supply component 101.

[0048] In some embodiments, a first pressure measuring element 104 is further provided in the intake pipe 110. The first pressure measuring element 104 is located upstream of the precooling element 105 and is used to detect the pressure at the inlet of the precooling element 105 and to issue an alarm when the pressure at the inlet of the precooling element 105 is too low. The first pressure measuring element 104 can be a digital display pressure sensor.

[0049] In some embodiments, the supercritical CO2 corrosion test system further includes a cold water supply 106 disposed on the precooling component 105 for providing the required cooling capacity to the precooling component 105, thereby controlling the temperature of carbon dioxide in the intake pipe 110.

[0050] In some embodiments, a filter element 107 is also provided in the intake pipe 110. The filter element 107 is disposed between the precooling element 105 and the booster pump 121 to remove impurities from the liquid carbon dioxide, thereby obtaining clean liquid carbon dioxide. The filter element 107 can be a sintered T-type filter with a diameter of 15 μm.

[0051] In some embodiments, a second pressure measuring element 123 is also provided in the intake pipe 110. The second pressure measuring element 123 is located downstream of the booster pump 121 and is used to detect the pressure at the outlet of the booster pump 121. When the pressure at the outlet of the booster pump 121 is too high, an alarm is triggered, thereby preventing the booster pump 121 from malfunctioning due to excessive pressure at the outlet.

[0052] In some embodiments, the intake pipe 110 is further provided with a valve 122 and a one-way valve 124, which are sequentially arranged downstream of the second pressure measuring element 123. The valve 122 controls the flow of liquid carbon dioxide in the intake pipe 110; the one-way valve 124 prevents the liquid carbon dioxide from flowing backwards in the intake pipe 110. The second pressure measuring element 123 can be a digital pressure sensor.

[0053] In some embodiments, the supercritical CO2 corrosion test system further includes a temperature control device 132, which is disposed on the preheating element 131 and is used to display the temperature of the preheating element 131 so that the preheating element 131 adjusts its heating power according to the temperature measured by the temperature control device 132.

[0054] In some embodiments, the cooling member 141 is provided with a cold water supply member 106, which provides a source of cooling for the cooling member 141.

[0055] In some embodiments, a second temperature measuring element 142 is further provided in the intake pipe 110, and the second temperature measuring element 142 is located downstream of the cooling element 141. The second temperature measuring element 142 is used to detect the temperature of the cooled supercritical CO2, and to issue an alarm when the temperature of the cooled supercritical CO2 exceeds 40°C.

[0056] In some embodiments, the supercritical CO2 corrosion test system further includes a third pressure measuring element 143, a vent valve 146, and a rupture disc 145. The third pressure measuring element 143, the vent valve 146, and the rupture disc 145 are sequentially arranged in another parallel pipeline of the intake pipeline 110. The third pressure measuring element 143 measures the pressure within the parallel pipeline, and controls the opening and closing of the vent valve 146 based on the measured pressure. The opening and closing of the vent valve 146 controls the discharge of CO2 from the pipeline, thereby regulating the pressure within the parallel pipeline. The third pressure measuring element 143 can be a digital pressure sensor. The rupture disc 145 bursts at a predetermined temperature and pressure, releasing pressure and preventing equipment failure due to excessive internal pressure in the parallel pipeline.

[0057] In some embodiments, an exhaust valve 144 is also provided in the intake pipe 110. The exhaust valve 144 is located downstream of the second temperature measuring element 142. By controlling the opening and closing of the exhaust valve 144, the flow of supercritical CO2 is controlled.

[0058] Figure 2 is a cross-sectional schematic diagram of a sample loading device 1 according to an embodiment of this application, and Figure 3 is a partially enlarged schematic diagram of the sample chamber of the sample loading device in Figure 2. As shown in Figures 2 and 3, the sample loading device 1 may include: a sample chamber 10; an inlet port 20; an outlet port 30; a sample holding assembly 40; and a rotation drive 60. The inlet port 20 is used to introduce supercritical CO2 gas into the sample chamber 10. The outlet port 30 is used to allow the supercritical CO2 gas in the sample chamber 10 to flow out of the sample chamber 10. The sample holding assembly 40 is disposed in the sample chamber 10 and is used to hold multiple samples 50. The rotation drive 60 is used to drive the sample holding assembly 40 to rotate, thereby enabling the supercritical CO2 in the sample chamber 10 to flow at high speed along the surface of the sample 50.

[0059] In this embodiment, the sample holding assembly 40 is driven to rotate by the rotating drive component 60, so that the sample 50 has a certain linear velocity, thereby increasing the relative flow rate of supercritical CO2 to the sample 50 in the sample chamber 10, enabling the supercritical CO2 to flow at high speed along the surface of the sample 50, thereby enabling high-flow-rate supercritical CO2 corrosion testing of the sample 50.

[0060] Figure 4 is a cross-sectional schematic diagram of a sample holding assembly 40 according to an embodiment of the present application, and Figure 5 is an exploded schematic diagram of a sample holding assembly 40 according to an embodiment of the present application.

[0061] As shown in Figures 4 and 5, in some embodiments, the sample holding assembly 40 may include two holding members 41 disposed opposite to each other and a connecting assembly 42. Each holding member 41 has multiple positioning grooves 4111 formed thereon. The sample 50 is a disc-shaped sample 50, and each disc-shaped sample 50 is inserted into and held in the corresponding positioning grooves 4111 of the two holding members 41. The connecting assembly 42 is used to connect the two holding members 41 to a rotation drive member 60. In such an embodiment, the rotation drive member 60 is connected to the two holding members 41 via the connecting assembly 42, realizing the rotation of the disc-shaped sample 50 inserted into and held in the corresponding positioning grooves 4111 of the two holding members 41, thereby giving the disc-shaped sample 50 a certain linear velocity. The rotation drive member 60 drives the disc-shaped sample 50 to move relative to the supercritical CO2, thus eliminating the need to directly provide high-flow-rate CO2, reducing the load on CO2 filling, storage, heat exchange, and other equipment, and greatly reducing equipment manufacturing costs.

[0062] In some embodiments, the two retainers 41 have the same structure. The retainer 41 can be an upper six-jaw clamping plate and a lower six-jaw clamping plate.

[0063] Figure 6 is a top view of a retainer 41 according to an embodiment of the present application. As shown in Figure 6, the retainer 41 forms a plurality of positioning groove groups 411 distributed along its circumference. Each positioning groove group 411 includes a plurality of positioning grooves 4111 at different distances from the rotation axis of the retainer 41. The distance between one positioning groove 4111 in each positioning groove group 411 and the rotation axis is the same as the distance between the corresponding positioning groove 4111 in any other positioning groove group 411 and the rotation axis.

[0064] Since the distance between one positioning slot 4111 in each positioning slot group 411 and the rotation axis is the same as the distance between the corresponding positioning slot 4111 in any other positioning slot group 411 and the rotation axis, multiple positioning slot groups 411 result in multiple samples 50 with the same linear velocity, thereby increasing the number of samples 50 with the same linear velocity.

[0065] Since each positioning groove group 411 includes multiple positioning grooves 4111 at different distances from the rotation axis of the retainer 41, and the multiple positioning grooves 4111 in each positioning groove group 411 are arranged on the same horizontal axis passing through the rotation axis, multiple samples 50 arranged in a positioning groove group 411 have the same angular velocity and different linear velocities, thus simulating corrosion testing of samples under different supercritical CO2 flow rate conditions in a single test.

[0066] In some embodiments, each positioning groove 4111 includes a central groove region 41111 and end groove regions 41112 disposed at both ends of the central groove region 41111 along its length direction. The width of the central groove region 41111 is greater than the width of the end groove regions 41112. The length direction of the positioning groove 4111 is perpendicular to the radial direction of the retainer 41. The entire length of the positioning groove 4111 is less than the diameter of the disc-shaped sample 50; the width of the end groove area 41112 is greater than the thickness of the disc-shaped sample 50. Therefore, when the disc-shaped sample 50 is inserted into the positioning groove 4111, the contact surface between the positioning groove 4111 and the disc-shaped sample 50 is a "line contact" rather than a "surface contact". This reduces the contact area between the positioning groove 4111 and the disc-shaped sample 50, making the disc-shaped sample 50 less affected by the positioning groove 4111 during the test. The contact area between the disc-shaped sample 50 and supercritical CO2 is also larger, resulting in a more complete reaction between the disc-shaped sample 50 and supercritical CO2.

[0067] As shown in Figure 4, the retainer 41 includes a core 412 and multiple extensions 413 connected to the core 412 along its periphery. Each positioning groove group 411 is disposed on a corresponding extension 413. This arrangement helps to reduce the overall weight of the retainer 41 while keeping the number of test samples 50 constant. This reduces unnecessary friction and inertia when the rotation drive 60 drives the retainer 41 to rotate, and further reduces the energy consumption required for the rotation drive 60 to drive the retainer 41 to rotate. At the same time, reducing the overall weight of the retainer 41 also helps to make the rotation drive 60 drive the retainer 41 more stable, thereby ensuring the stability of the rotation drive 60 when driving the sample 50 to rotate.

[0068] In some embodiments, the extension 413 extends radially outward from the core 412.

[0069] In some embodiments, each extension 413 has the same shape and is arranged axially symmetrically with respect to the axis of rotation.

[0070] In some embodiments, the number of extensions 413 can be six, and the included angle between two adjacent extensions 413 is 60°. This arrangement ensures that the retainer 41 is subjected to balanced forces in the horizontal direction, preventing the retainer 41 from tilting in the horizontal direction and enabling the retainer 41 to rotate stably in the horizontal direction.

[0071] In some embodiments, the number of positioning slots 4111 in each extension 413 can be 2-6.

[0072] In some embodiments, the distance between the positioning groove 4111 furthest from the rotation axis in each extension 413 and the rotation axis can be 80mm, and the distance between two adjacent positioning grooves 4111 in the same extension 413 can be one-tenth of the above distance, i.e., 8mm.

[0073] In some embodiments, the rotational drive 60 drives the sample holding assembly 40 to rotate at a speed of up to 1000 r / min, for example, 1800 r / min. The sample 50 held by the sample holding assembly 40 can have a flow rate greater than 5 m / s relative to the supercritical CO2.

[0074] As shown in Figure 5, the rotation drive 60 includes a rotation shaft 61, and each retainer 41 has a central mounting hole 414. The connecting assembly 42 may include a connecting kit 421, a connecting mating part 422, and a fastener 423. The connecting kit 421 and the connecting mating part 422 are respectively disposed on opposite sides of the two retainers 41. The connecting kit 421 enters the two central mounting holes 414 and is detachably connected to the rotation shaft 61. The fastener 423 detachably connects the connecting mating part 422 to the rotation shaft 61, thereby connecting the two retainers 41 and connecting the two retainers 41 to the rotation shaft 61. The connecting assembly 42 connects the two retainers 41, realizing the fixation of the two retainers 41 and the stable clamping of the sample 50. At the same time, the connecting assembly 42 connects the two retainers 41 to the rotation drive 60, thereby realizing the driving of the two retainers 41 by the rotation drive 60. In this way, the sample 50 and the sample holding assembly 40 can be disassembled and assembled at the same time as the sample holding assembly 40 and the rotating shaft 61, simplifying the loading and unloading operation.

[0075] In some embodiments, the rotating shaft 61 is provided with a rotating shaft interface 611, which is a hollow cylinder for detachable connection with the connecting kit 421 and the fastener 423. In some embodiments, the rotating shaft interface 611 is inserted inside the connecting kit 421, and the rotating shaft interface 611 is detachably connected to the connecting kit 421. In some embodiments, the detachable connection between the rotating shaft interface 611 and the connecting kit 421 can be a threaded connection.

[0076] In some embodiments, the connecting kit 421 includes a kit body 4211 and a snap-fit ​​portion 4212 disposed on the kit body. The outer diameter of the snap-fit ​​portion 4212 is larger than the inner diameter of the central mounting hole 414, and is used to snap onto one side of the rotating shaft 61 of the retainer 41. The connecting mating member 422 is an annulus, and the outer diameter of the annulus is larger than the inner diameter of the central mounting hole 414. The snap-fit ​​portion 4212 and the connecting mating member 422 are respectively used to clamp the two retainers 41. The size of the kit body 4211 is less than or equal to the inner diameter of the central mounting hole 414, so that it can enter the central mounting hole 414. The rotating shaft interface 611 of the rotating shaft 61 enters the kit body 4211 and is threadedly connected to the kit body 4211; the fastener 423 passes through the connecting mating member 422 from the other side and enters the rotating shaft interface 611 and is threadedly connected to the rotating shaft interface 611.

[0077] In some embodiments, the fastener 423 may be a locking screw, and the connecting mating part 422 may be a locking washer. For example, the fastener 423 may be an M6 hex socket head cap screw.

[0078] The retainer 41 can be a ceramic part.

[0079] As shown in Figure 5, the connecting assembly 42 also includes a pad 424 disposed between the two retainers 41, and the pad 424 has a pad mounting hole 4241. The connecting assembly 421 enters the two central mounting holes 414 and the pad mounting hole 4241. Multiple connectors 425 connect the two retainers 41 radially outward from the pad 424. The pad 424 is provided between the two retainers 41 to ensure that the distance between the two retainers 41 remains constant when the sample holding assembly 40 is driven to rotate, thus ensuring the stability of the sample 50 between the two retainers 41. At the same time, by setting the height of the pad 424, the sample 50 can be movably positioned in the positioning grooves 4111 of the two retainers 41, preventing the sample 50 from being subjected to excessive stress applied by the retainers 41, thereby avoiding damage to the sample 50.

[0080] In some embodiments, the cross-sections of the center mounting hole 414, the pad mounting hole 4241, and the kit body 4211 are all hexagonal to prevent the kit body 4211 from rotating relative to the retainer 41.

[0081] In some embodiments, the retainer 41 is provided with a plurality of retainer outer mounting holes 415 on the radial outer side of the pad 424, each retainer 41 mounting hole being used for a connector 425 to enter.

[0082] In some embodiments, the connector 425 can be a screw and a nut, for example, when the screw is an M6 hexagon socket head cap screw, the nut is an M6 hexagon socket head cap nut.

[0083] As shown in Figure 2, the rotation drive 60 may further include: a drive 67, a rotating drum 62, and a magnet 621. The drive 67 drives the rotating drum 62 to rotate, and the magnet 621 is disposed on the rotating drum 62. A rotation shaft 61 is disposed radially inside the rotating drum 62 and the magnet 621, so that it rotates together with the rotating drum 62 under the magnetic force of the magnet 621. A bearing 68 is provided between the rotation shaft 61 and the rotating drum 62. The drive 67 can be a rotary motor, and theoretically, by adjusting the rotation speed of the rotary motor, the sample can obtain any linear velocity relative to supercritical CO2.

[0084] In some embodiments, the rotation drive 60 may further include: a connecting cylinder 622 connected to the rotating cylinder 62, and a magnet 621 may be disposed on the connecting cylinder 622.

[0085] In some embodiments, the rotational drive 60 can drive the rotating drum 62 to rotate at a speed exceeding 1000 r / min (e.g., 1800 r / min), with continuous rotation time reaching several thousand hours (e.g., one year). During prolonged high-speed rotation of the rotating drum 62, the magnet 621 mounted on the drum 62 will gradually heat up. If the magnet 621 becomes too hot, it will demagnetize, preventing the drive 67 from driving the rotating shaft 61. To address this issue, the rotational drive 60 may further include a rotating drum cooling component 63. The rotating drum cooling component 63 cools the rotating drum 62 and the magnet 621, preventing demagnetization of the magnet 621 and ensuring the sample loading device 1 can be used for extended periods.

[0086] As shown in Figure 2, the sample loading device 1 may further include a body 70 and a cover 71. The body 70 has a top opening. The cover 71 is used to close the top opening to form a sample chamber 10 together with the body 70. A rotating shaft 61 passes through the cover 71 and enters the sample chamber 10. A bearing 68 is provided between the rotating shaft 61 and the cover 71. The bearing 68 may be mounted on a bearing seat and then connected to the cover 71 by fasteners 74.

[0087] Sample 50 can be a circular sample with a diameter of 16 mm and a thickness of 1 mm.

[0088] The sample loading device 1 of this application embodiment can set the volume of the sample chamber 10 to be small, such as about 1L, which can effectively reduce heat loss, reduce carbon dioxide consumption, and eliminate interference caused by differences in test temperature of samples at different positions due to excessive volume and excessive test section length.

[0089] When the volume of sample chamber 10 is set to approximately 1L, the theoretical value of carbon dioxide consumed per run of the supercritical CO2 corrosion test is 0.1kg. Compared with the high-flow-rate supercritical carbon dioxide corrosion test device that provides high-flow-rate CO2 in related technologies, the theoretical value of carbon dioxide consumed per run of the former is one-thousandth of that of the latter.

[0090] The rotation drive 60 also includes a shaft cooling component 64 for cooling the rotation shaft 61. The shaft cooling component 64 is connected to the cover 71 below the rotating cylinder 62. The shaft cooling component 64 is used to reduce the temperature of the surface of the rotation shaft 61, prevent heat from the sample chamber 10 from diffusing to the magnet 621, and avoid demagnetizing the magnet 621.

[0091] The air inlet 20 and the air outlet 30 are respectively formed on the cover 71 and penetrate through the cover 71. The air inlet 20 and the air outlet 30 can be located on both radial sides of the rotating shaft 61.

[0092] As shown in Figure 2, in some embodiments, the device further includes a fixing member 72. The cover 71 has a through hole 711, and the body 70 has a groove 701 corresponding to the through hole 711 of the cover 71. The fixing member 72 passes through the through hole 711 of the cover 71 and is detachably connected to the corresponding groove 701 of the body 70, for realizing the combination and disassembly of the cover 71 and the body 70.

[0093] In some embodiments, the body 70 is provided with a heating element and a temperature measuring element. The heating element is used to heat the sample chamber 10 to bring the supercritical CO2 in the sample chamber 10 to a preset test temperature. The temperature measuring element is used to measure the temperature of the sample chamber 10 so that the heating element adjusts the heating power according to the temperature measured by the temperature measuring element. The heating element of the body 70 can be an electric heating element.

[0094] In some embodiments, the fastener 72 may be a nut or bolt, used to achieve a tight connection between the cover 71 and the body 70.

[0095] As shown in Figure 3, in some embodiments, the bottom wall of the sample chamber 10 is provided with a stationary sample slot 73, which is located directly below the rotating shaft 61. The stationary sample slot 73 is used to place the sample 50. During the test, since the sample 50 is directly below the rotating shaft 61, the airflow in the sample chamber 10 is minimal, which is equivalent to the sample 50 being in a stationary state.

[0096] As shown in Figure 2, the rotation drive component 60 also includes a drive mounting component 65 and a spacer 66. The drive component 67 and the rotating drum cooling component 63 are disposed on the drive mounting component 65. The spacer 66 is connected to the rotating shaft cooling component 64 and the drive mounting component 65, and is positioned between the rotating shaft 61 and the rotating drum 62. A bearing 68 is provided between the connecting cylinder 622 and the spacer 66 to improve the stability of the rotation of the rotating drum 62 and the magnet 621.

[0097] The shaft cooling component 64 is connected to the spacer 66, and the shaft cooling component 64 supports the spacer 66 and the drive mounting component 65.

[0098] The shaft cooling component 64 and the drum cooling component 63 can be cooled by water.

[0099] In some embodiments, the spacer 66 forms a first connecting portion 661 and a second connecting portion 662. The first connecting portion 661 is disposed between the rotating shaft 61 and the rotating cylinder 62 and the magnet 621, and the second connecting portion 662 is used to connect the rotating shaft cooling component 64 and the drive mounting component 65 to achieve a stable connection between the rotating shaft cooling component 64 and the drive mounting component 65.

[0100] In some embodiments, the shaft cooling member 64 forms a first cooling connection 641, a cooling body 643, and a second cooling connection 642. The first cooling connection 641 is connected to the second connection 662 of the spacer 66. The cooling body 643 is disposed on the outside of the rotating shaft 61 to reduce the surface temperature of the rotating shaft 61. The second cooling connection 642 is connected to the cover 71.

[0101] By providing the first cooling connection part 641, the rotation drive 60 can be installed on the cover 71 as a whole, and the cover 71 and the rotation drive 60 can be moved as a whole, which facilitates the assembly and disassembly of the sample holding assembly 40; and the heat in the sample chamber 10 will not be transferred to the magnet 621.

[0102] This application also provides a supercritical CO2 corrosion test method, utilizing the supercritical CO2 corrosion test system of this application. The test method includes: introducing supercritical CO2 into a sample chamber 10, the supercritical CO2 flowing sequentially through the sample chamber 10, a pressure regulating valve 80, and an auxiliary pressure regulating component 90 before being introduced into the atmospheric environment; adjusting the pressure regulating valve 80 to make the pressure in the sample chamber a first preset pressure; adjusting the auxiliary pressure regulating component 90 to make the pressure at the outlet of the pressure regulating valve 80 a second preset pressure, the second preset pressure being less than the first preset pressure but greater than atmospheric pressure; and then conducting a supercritical CO2 corrosion test.

[0103] In the method of this application embodiment, the pressure in the sample chamber 10 is adjusted by the pressure regulating valve 80 to maintain the pressure in the sample chamber 10 at a preset pressure, so that the sample chamber 10 is maintained at the high pressure conditions required for the supercritical CO2 corrosion test; the pressure at the outlet of the pressure regulating valve 80 is increased to a second preset pressure by the auxiliary pressure regulating component 90, so as to reduce the pressure difference between the inlet and outlet of the pressure regulating valve 80, and avoid the pressure regulating valve 80 from cooling down rapidly due to the vaporization phase change of supercritical CO2 at the pressure regulating valve 80. This helps to ensure the precise control of the pressure in the sample chamber 10 by the pressure regulating valve 80, so that the pressure of supercritical CO2 in the sample chamber 10 remains stable.

[0104] In some embodiments, before conducting the supercritical CO2 corrosion test, each heating element is turned on to heat the supercritical CO2 to the preheating temperature; the rotation drive 60 is turned on to drive the sample holding assembly 40 to rotate to a preset speed, and the supercritical CO2 corrosion test begins.

[0105] In some embodiments, the pressure in the sample chamber 10 can be controlled at a target pressure (generally ≥15MPa) using a pressure regulating valve 80; and the pressure in the pressure stabilizing container 92 can be adjusted to 5-6MPa using an auxiliary pressure regulating valve 91.

[0106] In existing technologies, a single back pressure valve (i.e., pressure regulating valve 80) is typically used to control the pressure in the sample chamber 10. The pressure difference between the inlet and outlet of the back pressure valve is the pressure inside the sample chamber 10 minus atmospheric pressure. Assuming the pressure inside the sample chamber 10 is 25 MPa, the pressure difference between the inlet and outlet of the back pressure valve is 25 - 0 = 25 MPa. This large pressure difference causes carbon dioxide to vaporize rapidly. During vaporization, carbon dioxide absorbs a large amount of heat, causing the valve body to cool down and freeze, thus reducing the valve's pressure regulation accuracy.

[0107] This application employs two back pressure valves to reduce the inlet and outlet pressure difference of a single back pressure valve. Assuming the pressure inside sample chamber 10 is 25 MPa, the outlet pressure of the first-stage back pressure valve (i.e., pressure regulating valve 80) is increased to 5 MPa using a second-stage back pressure valve (i.e., auxiliary pressure regulating valve 91). At this point, the inlet and outlet pressure difference of the first-stage back pressure valve is 25 - 5 = 20 MPa, and the inlet and outlet pressure difference of the second-stage back pressure valve is 5 - 0 = 5 MPa. Both inlet and outlet pressure differences of the two back pressure valves are less than the valve inlet and outlet pressures controlled by a single back pressure valve. Through this two-stage pressure reduction, the inlet and outlet pressure difference of each back pressure valve is lowered, preventing drastic phase changes in carbon dioxide as it passes through the inlet and outlet of the back pressure valves. This reduces the heat absorption of carbon dioxide, minimizes the temperature drop of the valve body, and thus enables the valve's pressure control accuracy to reach ±0.5 MPa.

[0108] In the embodiments of this application, the purpose of providing a pressure stabilizing container 92 is to increase the pipeline volume of the inlet section of the auxiliary pressure regulating valve 91. When the auxiliary pressure regulating valve 91 controls the pressure to discharge, it will not cause drastic pressure fluctuations in the inlet section of the auxiliary pressure regulating valve 91, which helps to limit pressure fluctuations to within ±0.5MPa. If the pressure stabilizing container 92 is not provided, when the auxiliary pressure regulating valve 91 controls the pressure to discharge, the pressure fluctuation in the inlet section of the auxiliary pressure regulating valve 91 will reach more than ±2MPa, thereby affecting the accuracy of pressure regulation.

[0109] The volume of the pressure stabilizing container 92 can be, for example, 200 ml.

[0110] As shown in Figure 7, in some embodiments, the supercritical CO2 corrosion test system may further include a pressure-stabilizing heating element 1005 for heating the pressure-stabilizing container 92 to keep the carbon dioxide in the pressure-stabilizing container 92 in a gaseous state. By setting the pressure-stabilizing heating element 1005, the pressure-stabilizing container 92 is filled with carbon dioxide gas, with no liquid carbon dioxide. When the auxiliary pressure regulating valve 91 exhausts gas, the carbon dioxide in the pressure-stabilizing container 92 does not undergo a phase change from liquid to gas, which is beneficial to further improve the pressure control accuracy of the auxiliary pressure regulating valve 91.

[0111] Specifically, when the auxiliary pressure regulating valve 91 regulates the pressure inside the pressure stabilizing container 92 to 5-6 MPa, the pressure stabilizing heating element 1005 can heat the temperature of the pressure stabilizing container 92 to 50℃-100℃, so that the pressure stabilizing container 92 is filled with carbon dioxide gas and there is no carbon dioxide liquid.

[0112] In some embodiments, the supercritical CO2 corrosion test system further includes: a mounting plate 1001, a pressure regulating valve 80, and an auxiliary pressure regulating component 90 that can be mounted on the mounting plate 1001.

[0113] In some embodiments, the supercritical CO2 corrosion test system further includes: a first fixed frame 1002 and a second fixed frame 1003, a pressure regulating valve 80 and a first electric heating element 82 can be mounted on a mounting plate 1001 through the first fixed frame 1002, and an auxiliary pressure regulating valve 91 and an auxiliary electric heating element 95 can be mounted on a mounting plate 1001 through the second fixed frame 1003.

[0114] Both the pressure stabilizing vessel 92 and the pressure measuring device 93 can be mounted on the mounting plate 1001 using mounting components.

[0115] The pipeline connected to the outlet of the pressure stabilizing vessel 92, the pipeline connected to the pressure measuring element 93, and the pipeline connected to the inlet of the auxiliary pressure regulating valve 91 can be connected by a tee 1004.

[0116] The pressure measuring element 93 can measure the pressure of the pressure stabilizing vessel 92.

[0117] In some embodiments, the first electric heating element 82 and the auxiliary electric heating element 95 can each be a heating plate. Since the valve core of the back pressure valve is close to the bottom of the valve body, and the bottom surface of the valve is flat and regularly shaped, the heating plate can be set at the bottom of the valve body to increase the heating area. The heating temperature of the heating plate can be arbitrarily adjusted within the range of room temperature to 100°C using a temperature controller to preheat the valve. After the back pressure valve is preheated, the heat from the heating plate can offset some of the heat absorbed by the valve body, which helps to stabilize the valve's pressure control accuracy within ±0.5MPa.

[0118] The following description, in conjunction with the accompanying drawings and specific embodiments, further illustrates the process and method for conducting supercritical CO2 corrosion tests using the system of the present invention.

[0119] 1. Safety check: After powering on the equipment, check whether the display status of each measuring component is normal, whether the water level of the cold water supply component 106 is normal, close all valves, and check whether all test parameters and alarm parameters of the equipment are set correctly.

[0120] 2. Place the sample: Assemble the sample 50, the sample holding component 40 and the rotating interface 611 on the cover 71, and then put the sample holding component 40 into the body 70.

[0121] 3. Sealing of sample chamber 10: Check whether there are solid particles or debris on the contact surface between the cover 71 and the body 70, check whether the fastener 72 is installed correctly, and use the fastener 72 to tighten the cover 71 and the body 70 to seal the sample chamber 10.

[0122] 4. Carbon Dioxide Intake: The carbon dioxide supply unit 101 supplies gaseous carbon dioxide to the intake pipe 110. The gas source valve 102 is opened, and the introduced air is discharged through the displacement valve 103. The readings of the first pressure measuring device 104 are observed to ensure they are normal. The valve 122 is slowly opened to inject carbon dioxide into the sample chamber 10. The readings of the second pressure measuring device 123 and the third pressure measuring device 143 are observed to ensure they are normal. The exhaust valve 144 is opened, and the vent valve 146 is opened to purge and replace the air in the sample chamber 10.

[0123] 5. Test Condition Control: Close the vent valve 146, supply power to the cold water supply unit 106 to provide cooling to the precooling unit 105 and the cooling unit 141. The precooling unit 105 liquefies gaseous carbon dioxide into liquid carbon dioxide, and the cooling unit 141 lowers the temperature of the carbon dioxide in the pipeline. Power on each electric heating element, and each temperature control unit automatically adjusts the power of the electric heating element according to the preset temperature. Turn on the booster pump 121, and adjust the handles of the pressure regulating valve 80 and the auxiliary pressure regulating valve 91 until the pressure in the sample chamber 10 reaches the preset test pressure and the pressure in the pressure stabilizing container 92 reaches the preset pressure.

[0124] 6. Adjust the speed: Start the drive unit 67 and adjust the speed of the drive unit 67 according to different linear speed requirements to start the test.

[0125] 7. After the test, turn off the drive unit 67, the gas source valve 102, and the booster pump 121. Slowly rotate the handle of the pressure regulating valve 80 and the auxiliary pressure regulating valve 91 counterclockwise to allow the CO2 in the test system to be discharged into the atmosphere sequentially through the pressure regulating valve 80 and the auxiliary pressure regulating valve 91. When the pressures measured by the first pressure measuring device 104, the second pressure measuring device 123, and the third pressure measuring device 143 all drop to 0, turn off the cold water supply unit 106 and all electric heating elements. After the temperature of the sample chamber 10 drops to room temperature, tighten the fixing part 72, open the cover 71, and remove the sample 50.

[0126] Regarding the embodiments of this application, it should also be noted that, without conflict, the embodiments of this application and the features in the embodiments can be combined with each other to obtain new embodiments.

[0127] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. The scope of protection of this application shall be determined by the scope of the claims.

Claims

1. A supercritical CO2 corrosion testing system, characterized in that, include: A sample loading device is provided, the sample loading device being configured to have a sample chamber for placing a sample, the sample chamber also being used to receive supercritical CO2 fluid so that the sample in the sample chamber is subjected to a corrosion test in a supercritical CO2 atmosphere. A pressure regulating valve is located downstream of the sample chamber along the flow direction of the supercritical CO2 fluid, and is used to regulate the pressure of the sample chamber so that the sample in the sample chamber is tested at a first preset pressure. An auxiliary pressure regulator is used to increase the pressure at the outlet of the pressure regulating valve.

2. The system according to claim 1, characterized in that, The auxiliary pressure regulating component includes: An auxiliary pressure regulating valve is disposed downstream of the pressure regulating valve along the flow direction of the supercritical CO2 fluid. The supercritical CO2 fluid from the outlet of the pressure regulating valve flows to the inlet of the auxiliary pressure regulating valve and flows to the atmospheric environment from the outlet of the auxiliary pressure regulating valve. The auxiliary pressure regulating valve is configured to adjust the pressure on the inlet side of the auxiliary pressure regulating valve to a second preset pressure, wherein the second preset pressure is less than the first preset pressure and greater than atmospheric pressure.

3. The system according to claim 2, characterized in that, The auxiliary pressure regulating component also includes: A pressure stabilizing container is disposed in the flow path between the pressure regulating valve and the auxiliary pressure regulating valve, wherein the auxiliary pressure regulating valve regulates the pressure inside the pressure stabilizing container.

4. The system according to claim 3, characterized in that, The auxiliary pressure regulating component also includes: A pressure measuring element is disposed in the flow path between the pressure stabilizing vessel and the auxiliary pressure regulating valve, for measuring the pressure at the inlet of the auxiliary pressure regulating valve, so as to adjust the opening degree of the auxiliary pressure regulating valve according to the pressure measured by the pressure measuring element.

5. The system according to claim 2, characterized in that, The auxiliary pressure regulating component also includes: An auxiliary temperature measuring element is used to measure the temperature of the auxiliary pressure regulating valve; An auxiliary electric heating element heats the auxiliary pressure regulating valve to a preset temperature based on the temperature measured by the auxiliary temperature measuring element.

6. The system according to claim 5, characterized in that, The preset temperature is higher than room temperature, and the second preset pressure is greater than the saturated vapor pressure of CO2 at room temperature.

7. The system according to claim 2, characterized in that, Also includes: A first temperature measuring element is used to measure the temperature of the pressure regulating valve; A first electric heating element heats the pressure regulating valve according to the temperature measured by the first temperature measuring element, so as to heat the temperature of the pressure regulating valve to a preset temperature.

8. The system according to claim 1, characterized in that, The sample loading device includes: The body has a top opening; A cover body for closing the top opening to form the sample chamber together with the body body; An air inlet is used to introduce supercritical CO2 gas into the sample chamber. The gas outlet is used to allow the supercritical CO2 gas in the sample chamber to flow out of the sample chamber. A sample holding assembly, disposed in the sample chamber, is used to hold multiple samples; A rotation drive is used to drive the sample holding assembly to rotate, thereby enabling supercritical CO2 in the sample chamber to flow at high speed along the sample surface.

9. The system according to claim 8, characterized in that, The sample holding assembly includes: Two opposing retainers are provided, each retainer having multiple positioning grooves. The sample is a disc-shaped sample, and each disc-shaped sample is inserted into and held in the corresponding positioning groove of the two retainers. A connecting assembly for connecting the two retainers and connecting the two retainers to the rotation drive.

10. The system according to claim 9, characterized in that, The retainer forms a plurality of positioning groove groups distributed along its circumference, each positioning groove group including a plurality of positioning grooves at different distances from the rotation axis of the retainer; the distance between one positioning groove in each positioning groove group and the rotation axis is the same as the distance between a corresponding positioning groove in any other positioning groove group and the rotation axis.

11. The system according to claim 10, characterized in that, The retainer includes a core and a plurality of extensions connected to the core along the periphery of the core, each of the positioning grooves being disposed on a corresponding extension.

12. The system according to claim 3, characterized in that, The auxiliary pressure regulating component also includes: A pressure-stabilizing heating element is used to heat the pressure-stabilizing container so that the carbon dioxide inside the pressure-stabilizing container remains in a gaseous state.

13. A supercritical CO2 corrosion testing system, characterized in that, include: A carbon dioxide supply unit and an intake pipe, wherein the carbon dioxide supply unit is used to supply gaseous carbon dioxide to the intake pipe, so that gaseous carbon dioxide is input into the intake pipe; A precooling component is used to lower the temperature of carbon dioxide in the intake pipe, thereby liquefying gaseous carbon dioxide. A booster pump is used to pressurize the liquid carbon dioxide in the intake pipeline to the test pressure of the supercritical CO2 corrosion test, so as to provide the high-pressure supercritical CO2 required for the test. A sample loading device is provided, the sample loading device being configured to have a sample chamber for placing a sample, the sample chamber also being used to receive supercritical CO2 fluid so that the sample in the sample chamber is subjected to a corrosion test in a supercritical CO2 atmosphere. A cooling element is installed in the downstream pipeline of the sample chamber to cool the high-temperature supercritical CO2 to below 40°C. A pressure regulating valve is located downstream of the sample chamber along the flow direction of the supercritical CO2 fluid, and is used to regulate the pressure of the sample chamber so that the sample in the sample chamber is tested at a first preset pressure. An auxiliary pressure regulator is used to increase the pressure at the outlet of the pressure regulating valve.

14. The system according to claim 13, characterized in that, Also includes: A preheating component, located downstream of the booster pump, is used to preheat the supercritical CO2 to a test temperature similar to that of the supercritical CO2 corrosion test, so as to provide the high-temperature and high-pressure supercritical CO2 required for the test. After preheating, high-temperature and high-pressure supercritical CO2 enters the sample chamber, where it is further heated to the test temperature and flows out of the sample chamber after passing through the sample.

15. A supercritical CO2 corrosion test method, characterized in that, The method is achieved using the supercritical CO2 corrosion testing system according to any one of claims 1-14, and the method includes: Supercritical CO2 is introduced into the sample chamber, and the supercritical CO2 flows sequentially through the sample chamber, the pressure regulating valve, and the auxiliary pressure regulating component before being released into the atmospheric environment. Adjust the pressure regulating valve to bring the pressure in the sample chamber to a first preset pressure; Adjust the auxiliary pressure regulating component so that the pressure at the outlet of the pressure regulating valve is a second preset pressure, which is less than the first preset pressure and greater than atmospheric pressure; Then, a supercritical CO2 corrosion test was conducted.

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