Dense-phase carbon dioxide pipeline leakage simulation system and method

Abstract

The invention discloses a dense-phase carbon dioxide pipeline leakage simulation system and method.The experimental device comprises a carbon dioxide injection device, a pressure-bearing container, a pressure-bearing pipeline, a temperature monitoring device and a temperature collecting device, and the carbon dioxide injection device is provided with a fluid outlet used for outputting dense-phase carbon dioxide; the pressure-bearing container is provided with a pressure-bearing cavity used for being filled with soil, the pressure-bearing pipeline is arranged in the pressure-bearing cavity, the pressure-bearing pipeline is connected with the fluid outlet, the pressure-bearing pipeline is provided with a leakage opening, the temperature monitoring device comprises a plurality of temperature sensors, the temperature sensors are arranged in the pressure-bearing cavity at intervals, and the temperature sensors are all electrically connected with the temperature collecting device. And the temperature acquisition device is used for receiving and processing the soil temperature monitored by the temperature sensor. The experimental device provided by the embodiment of the invention can simulate and verify the influence and diffusion rule of dense-phase carbon dioxide pipeline transportation leakage on soil temperature distribution, and provides a theoretical basis for dense-phase carbon dioxide leakage prevention and control and emergency disposal in practical application.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gas pipeline transportation, and in particular to a dense-phase carbon dioxide pipeline leakage simulation system and method. BACKGROUND

[0002] In the process of carbon sequestration pipeline transportation, the dense-phase carbon dioxide pipeline is usually maintained at a high pressure of 8 MPa or more. Once a leakage occurs, the fluid rapidly expands under the action of a large pressure difference and undergoes a complex phase change process. For a buried pipeline, the carbon dioxide leakage process not only involves heavy gas diffusion in the atmospheric environment, but also may disturb the temperature field of the surrounding soil. At present, the research on the change in the soil temperature distribution and the diffusion law during the leakage of the dense-phase carbon dioxide pipeline is insufficient. Therefore, an experimental device is needed to simulate and verify the influence of the dense-phase carbon dioxide pipeline leakage on the soil temperature distribution and the diffusion law, so as to provide a theoretical basis for the prevention and control and emergency disposal of the dense-phase carbon dioxide leakage in practical applications. SUMMARY

[0003] The present application aims to at least partially solve one of the technical problems in the related art.

[0004] To this end, an embodiment of the present application proposes a carbon dioxide pipeline leakage simulation system, which uses a plurality of temperature sensors to monitor the soil temperature in real time, and transmits the soil temperature monitored by the plurality of temperature sensors to a temperature collection device, so as to analyze the received soil temperature by using the temperature collection device, thereby understanding the influence of the dense-phase carbon dioxide pipeline leakage on the soil temperature distribution and the diffusion law, and providing a theoretical basis for the prevention and control and emergency disposal of the dense-phase carbon dioxide leakage in practical applications.

[0005] The carbon dioxide pipeline leakage simulation system according to the embodiment of the present application includes a carbon dioxide injection device, a pressure-bearing container, a pressure-bearing pipeline, a temperature monitoring device, and a temperature collection device. The carbon dioxide injection device has a fluid outlet for outputting dense-phase carbon dioxide. The pressure-bearing container has a pressure-bearing cavity for filling soil. The pressure-bearing pipeline is arranged in the pressure-bearing cavity and is connected to the fluid outlet. The pressure-bearing pipeline has a leakage port. The temperature monitoring device includes a plurality of temperature sensors, which are arranged at intervals in the pressure-bearing cavity. The plurality of temperature sensors are electrically connected to the temperature collection device, so as to receive and process the soil temperature monitored by the temperature sensors by using the temperature collection device.

[0006] In some embodiments, a burst valve assembly is connected to the pressure-bearing pipeline, so as to form the leakage port when the burst valve assembly bursts.

[0007] In some embodiments, the diameter of the leakage port is 1 mm to 10 mm.

[0008] In some embodiments, the pressure-bearing pipeline is arranged at the bottom of the pressure-bearing cavity, and the leakage port is arranged upwardly, and the temperature monitoring device further comprises a plurality of rods, the plurality of rods are arranged at intervals, the rods extend vertically and are arranged in the pressure-bearing cavity, each of the rods is provided with a plurality of temperature sensors arranged at intervals along the extending direction of the rod.

[0009] In some embodiments, the interval between two temperature sensors arranged adjacently on the same rod is 8-12 cm.

[0010] In some embodiments, a part of the rods are a first rod, a second rod, a third rod, a fourth rod, a fifth rod and a sixth rod, the first rod, the second rod, the third rod and the fourth rod are arranged at intervals along a first direction in sequence, the third rod is arranged directly above the leakage port, the third rod, the fifth rod and the sixth rod are arranged at intervals along a second direction in sequence, and the first direction and the second direction are arranged at intersections.

[0011] In some embodiments, the third rod is arranged at the middle position of the first rod and the fourth rod along the first direction, and the second rod is arranged at the middle position of the first rod and the third rod along the first direction.

[0012] In some embodiments, the temperature sensor at the lowermost position of at least one rod is at the same height as the leakage port, or the temperature sensor at the lowermost position of at least one rod is higher than the leakage port.

[0013] In some embodiments, the carbon dioxide injection device comprises a gas container, a refrigeration device and a pressurizing device connected in sequence, the pressurizing device has the fluid outlet, the gas container is used for containing gaseous carbon dioxide, the refrigeration device is used for cooling the gaseous carbon dioxide output by the gas container, and the pressurizing device is used for pressurizing the gaseous carbon dioxide output by the refrigeration device, so that the gaseous carbon dioxide is converted into dense-phase carbon dioxide.

[0014] The carbon dioxide pipeline leakage simulation method of the embodiment of the present application adopts the experimental device of any one of the above embodiments, and the experimental method comprises the following steps:

[0015] The pressure-bearing pipeline and the plurality of temperature sensors are placed in the pressure-bearing cavity, and the pressure-bearing pipeline and the plurality of temperature sensors are filled with soil and buried in the pressure-bearing cavity;

[0016] Injecting dense-phase carbon dioxide into the pressure-bearing pipeline by using the carbon dioxide injection device, when the pressure in the pressure-bearing pipeline reaches the preset pressure, the leakage opening is opened, and then the dense-phase carbon dioxide injection into the pressure-bearing pipeline by using the carbon dioxide injection device is stopped;

[0017] The soil temperature is monitored by using the plurality of temperature sensors, and the soil temperature is transmitted to the temperature collection device.

[0018] The carbon dioxide pipeline leakage simulation system of the embodiment of the present application uses the plurality of temperature sensors to monitor the soil temperature in real time, and transmits the soil temperature monitored by the plurality of temperature sensors to the temperature collection device. The temperature collection device analyzes the received soil temperature, so as to understand the influence of the dense-phase carbon dioxide pipeline leakage on the soil temperature distribution and the diffusion law, and provide a theoretical basis for the dense-phase carbon dioxide leakage prevention and control and emergency disposal in actual application. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a structural schematic diagram of a carbon dioxide pipeline leakage simulation system of an embodiment of the present application.

[0020] Figure 2 is a structural schematic diagram of a pressure-bearing pipeline and a burst valve assembly of a carbon dioxide pipeline leakage simulation system of an embodiment of the present application.

[0021] Figure 3 is Figure 1 a top view of a pressure-bearing container.

[0022] Figure 4 is a flow schematic diagram of a carbon dioxide pipeline leakage simulation method of an embodiment of the present application.

[0023] REFERENCE SIGNS:

[0024] 100, experimental device;

[0025] 1, carbon dioxide injection device; 11, gas container; 12, refrigeration device; 13, pressure increasing device;

[0026] 2, pressure-bearing container;

[0027] 3, pressure-bearing pipeline; 31, burst valve assembly; 311, leakage opening;

[0028] 4, temperature sensor;

[0029] 51, first rod body; 52, second rod body; 53, third rod body; 54, fourth rod body; 55, fifth rod body; 56, sixth rod body; 57, seventh rod body; 58, eighth rod body. DETAILED DESCRIPTION

[0030] Embodiments of the present application are described below in detail, examples of which are shown in the accompanying drawings. The embodiments described below by reference to the accompanying drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0031] As shown in Figure 1 The carbon dioxide pipeline leakage simulation system 100 of the embodiment of the present application comprises a carbon dioxide injection device 1, a pressure-bearing container 2, a pressure-bearing pipeline 3, a temperature monitoring device and a temperature acquisition device. The carbon dioxide injection device has a fluid outlet for outputting dense-phase carbon dioxide. The pressure-bearing container 2 has a pressure-bearing cavity for filling soil. The pressure-bearing pipeline 3 is arranged in the pressure-bearing cavity and is connected with the fluid outlet. The pressure-bearing pipeline 3 has a leakage port 311. The temperature monitoring device comprises a plurality of temperature sensors 4 which are arranged at intervals in the pressure-bearing cavity and are electrically connected with the temperature acquisition device, so as to receive and process the soil temperature monitored by the temperature sensors 4 by using the temperature acquisition device.

[0032] In the carbon dioxide pipeline leakage simulation system 100 of the embodiment of the present application, when the experiment is performed, the pressure-bearing pipeline 3 and the plurality of temperature sensors 4 are first placed in the pressure-bearing cavity, and the pressure-bearing pipeline 3 is connected with the fluid outlet of the carbon dioxide injection device 1 and the temperature sensors 4 are electrically connected with the temperature acquisition device. Then, the soil is filled in the pressure-bearing cavity and the pressure-bearing pipeline 3 and the plurality of temperature sensors 4 are all buried, so as to complete the assembly of the experimental device 100. Then, the dense-phase carbon dioxide is injected into the pressure-bearing pipeline 3 by using the carbon dioxide injection device 1. When the pressure in the pressure-bearing pipeline 3 reaches the preset pressure, the leakage port 311 is opened, the dense-phase carbon dioxide starts to leak from the leakage port 311, and the injection of the dense-phase carbon dioxide into the pressure-bearing pipeline 3 is stopped. The soil temperature is monitored in real time by using the plurality of temperature sensors 4, and the soil temperature monitored by the plurality of temperature sensors 4 is transmitted to the temperature acquisition device. The received soil temperature is analyzed by using the temperature acquisition device, so as to understand the influence of the dense-phase carbon dioxide pipeline leakage on the soil temperature distribution and the diffusion law, and to provide a theoretical basis for the dense-phase carbon dioxide leakage prevention and control and emergency disposal in actual application.

[0033] Optionally, the soil is sandy soil.

[0034] Optionally, the pipe diameter of the pressure-bearing pipeline 3 is 150 mm.

[0035] Optionally, the temperature sensor 4 is a PT100 temperature sensor 4, and the temperature sensing range thereof is -85℃ to +150℃, and the accuracy thereof is 0.1℃.

[0036] Optionally, the temperature acquisition device is a DAS-RTD16 temperature acquisition module which is used in combination with the PT100 temperature sensor 4.

[0037] In some embodiments, as Figure 1As shown, the carbon dioxide injection device 1 comprises a gas container 11, a refrigeration device 12 and a pressurizing device 13 connected in sequence, the pressurizing device 13 has a fluid outlet, the gas container 11 is used for containing gaseous carbon dioxide, the refrigeration device 12 is used for cooling the gaseous carbon dioxide output by the gas container 11, and the pressurizing device 13 is used for pressurizing the gaseous carbon dioxide output by the refrigeration device 12, so that the gaseous carbon dioxide is converted into dense-phase carbon dioxide.

[0038] As an example, as shown in Figure 1 As shown, the pressure-bearing container 2 is a rectangular box body, and has a pressure-bearing cavity inside, the pressure-bearing container 2 comprises a body, a plurality of side plates and a cover body, and the side plates and the cover body are detachably connected with the body, so as to fill or remove the soil in the pressure-bearing cavity; the pressure-bearing pipeline 3 is fixedly installed in the pressure-bearing cavity and fixedly connected with the cavity wall of the pressure-bearing cavity.

[0039] The gas container 11 is a gas cylinder, the refrigeration device 12 comprises a refrigeration machine and a cold box, the outlet of the gas container 11 is connected with the inlet of the cold box through a pipeline, the refrigeration machine is used for cooling the gaseous carbon dioxide entering the cold box to below 0℃; the pressurizing device 13 is a high-pressure pump, the outlet of the cold box is connected with the inlet of the pressurizing device 13 through a pipeline, and the pressurizing device 13 is used for pressurizing the carbon dioxide discharged by the refrigeration device 12 to a preset pressure, so that the gaseous carbon dioxide is converted into high-pressure dense-phase carbon dioxide; the outlet of the pressurizing device 13 forms the above-mentioned fluid outlet, and the fluid outlet is connected with the pressure-bearing pipeline 3 through a pipeline, and the pipeline passes through the cavity wall of the pressure-bearing cavity.

[0040] Therefore, the gaseous carbon dioxide is cooled and pressurized by the carbon dioxide injection device 1 to form high-pressure dense-phase carbon dioxide, and the high-pressure dense-phase carbon dioxide is injected into the pressure-bearing pipeline 3, so as to complete the experiment.

[0041] Optionally, the preset pressure is 10MPa-15MPa.

[0042] In some embodiments, the pressure-bearing pipeline 3 is connected with a burst valve assembly 31 to form a leakage port 311 when the burst valve assembly 31 bursts.

[0043] In some embodiments, the diameter of the leakage port 311 is 1mm-10mm.

[0044] Optionally, the burst valve assembly 31 comprises a burst valve and an LP type burst disc.

[0045] The burst valve assembly 31 is burst to form the leakage port 311, so as to control the diameter and pressure of the leakage port 311 when leaking, and the pipeline leakage simulated by the burst disc is closer to the pipeline leakage in the real situation, so that the experimental results are more referential.

[0046] As an example, three specifications of burst valve assemblies 31 are provided, the first specification: the diameter of the burst disc is 3mm, that is, the caliber of the leakage port 311 is 3mm, and the pressure bearing is 15MPa, that is, when the pressure in the pressure-bearing pipeline 3 reaches 15MPa, the burst occurs and the leakage begins; the second specification: the diameter of the burst disc is 5mm, and the pressure bearing is 10MPa; the third specification: the diameter of the burst disc is 5mm, and the pressure bearing is 15MPa; thereby three groups of experiments can be carried out to test the different rules of the change of the surrounding soil temperature when the pipeline leaks at different leakage port 311 apertures and different pressures.

[0047] In some embodiments, as shown in Figure 2 The pressure-bearing pipeline 3 is arranged at the bottom of the pressure-bearing cavity, and the leakage port 311 is arranged upwardly, and the temperature monitoring device further comprises a plurality of rod bodies, the plurality of rod bodies are arranged at intervals, the rod bodies extend vertically and are arranged in the pressure-bearing cavity, a plurality of temperature sensors 4 are arranged correspondingly on each rod body, and the plurality of temperature sensors 4 are arranged at intervals along the extension direction of the rod body.

[0048] By adjusting the horizontal distance between the rod body and the leakage port 311, the position of the temperature sensor 4 in the horizontal direction can be adjusted, and by adjusting the distance between the plurality of temperature sensors 4 on the same rod body, the position of the temperature sensor 4 in the vertical direction can be adjusted, thereby more favorably realizing the positioning of the plurality of temperature sensors 4, and through the plurality of temperature sensors 4 distributed around the leakage port 311, the distribution rule and diffusion rule of the soil temperature after the leakage begins can be monitored, thereby providing a theoretical basis for the prevention and control and emergency disposal of the dense-phase carbon dioxide leakage in actual applications.

[0049] In some embodiments, the distance between two temperature sensors 4 arranged adjacently on the same rod body is 8cm-12cm.

[0050] Preferably, the distance between two temperature sensors 4 arranged adjacently on the same rod body is 10cm.

[0051] In some embodiments, a part of the rod bodies are respectively a first rod body 51, a second rod body 52, a third rod body 53, a fourth rod body 54, a fifth rod body 55 and a sixth rod body 56, the first rod body 51, the second rod body 52, the third rod body 53 and the fourth rod body 54 are arranged at intervals along a first direction in sequence, the third rod body 53 is arranged directly above the leakage port 311, the third rod body 53, the fifth rod body 55 and the sixth rod body 56 are arranged at intervals along a second direction in sequence, and the first direction and the second direction are arranged intersectingly.

[0052] In some embodiments, the third rod body 53 is arranged at an intermediate position of the first rod body 51 and the fourth rod body 54 along the first direction, and the second rod body 52 is arranged at an intermediate position of the first rod body 51 and the third rod body 53 along the first direction.

[0053] In some embodiments, the temperature sensor 4 at the lowermost position of the at least one rod body is at the same height as the leakage port 311, or the temperature sensor 4 at the lowermost position of the at least one rod body is higher than the leakage port 311.

[0054] As shown in the drawings, the first direction is horizontal and parallel to one vertical side wall of the pressure-bearing cavity, and the second direction is obliquely arranged relative to the first direction, and the second direction forms an angle a with the first direction, and a is 60°-75°. Figure 1 Figure 3 As shown in the drawings, the first direction is horizontal and parallel to one vertical side wall of the pressure-bearing cavity, and the second direction is obliquely arranged relative to the first direction, and the second direction forms an angle a with the first direction, and a is 60°-75°.

[0055] The rods extend vertically, and the number of rods is eight, which are a first rod 51, a second rod 52, a third rod 53, a fourth rod 54, a fifth rod 55, a sixth rod 56, a seventh rod 57, and an eighth rod 58; the first rod 51, the second rod 52, the third rod 53, and the fourth rod 54 are arranged in the first direction in sequence with a spacing, the third rod 53 is vertically located directly above the leakage port 311, and the third rod 53 is arranged at a middle position between the first rod 51 and the fourth rod 54, i.e., the spacing between the first rod 51 and the third rod 53 is equal to the spacing between the fourth rod 54 and the third rod 53; the second rod 52 is arranged at a middle position between the first rod 51 and the third rod 53, i.e., the spacing between the first rod 51 and the second rod 52 is equal to the spacing between the third rod 53 and the second rod 52. Among them, the spacing between the first rod 51 and the third rod 53 is 40mm, and the spacing between the first rod 51 and the second rod 52 is 20mm, in other words, the horizontal spacing between the first rod 51 and the fourth rod 54 and the leakage port 311 is 40mm, and the horizontal spacing between the second rod 52 and the leakage port 311 is 20mm.

[0056] The fifth rod 55, the sixth rod 56, the seventh rod 57, and the eighth rod 58 are arranged in the second direction in sequence with a spacing, the horizontal spacing between the fifth rod 55 and the leakage port 311 is the smallest, which is 126.5mm, and the spacing between any two adjacent rods among the fifth rod 55, the sixth rod 56, the seventh rod 57, and the eighth rod 58 is 50mm, i.e., the horizontal spacing between the sixth rod 56 and the leakage port 311 is 176.5mm, the horizontal spacing between the seventh rod 57 and the leakage port 311 is 226.5mm, and the horizontal spacing between the eighth rod 58 and the leakage port 311 is 276.5mm.

[0057] ​The interval between two temperature sensors 4 adjacent to each other on each rod body is 10 cm, and the height of the temperature sensor 4 at the uppermost side of each rod body is consistent; seven temperature sensors 4 are respectively installed on the second rod body 52 and the third rod body 53, and the temperature sensor 4 at the lowermost side of the second rod body 52 and the third rod body 53 is higher than the leakage port 311; eight temperature sensors 4 are installed on each of the remaining six rod bodies, and the temperature sensor 4 at the lowermost side of each of the remaining six rod bodies is consistent with the height of the leakage port 311.

[0058] Therefore, the plurality of temperature sensors 4 form a three-dimensional temperature monitoring network above the leakage port 311, and after the dense-phase carbon dioxide leaks from the leakage port 311, it is sprayed upward, and the plurality of temperature sensors 4 can be used to monitor the soil temperature change at each monitoring point in real time, so as to determine the diffusion law after the high-pressure dense-phase carbon dioxide buried pipeline leaks and the influence on the soil temperature distribution.

[0059] As shown in Figure 4 The carbon dioxide pipeline leakage simulation method of the embodiment of the present application adopts the experimental device 100 of any one of the above embodiments, and the experimental method comprises the following steps:

[0060] S1: placing the pressure-bearing pipeline 3 and the plurality of temperature sensors 4 in the pressure-bearing cavity, filling the soil in the pressure-bearing cavity, and burying the pressure-bearing pipeline 3 and the plurality of temperature sensors 4;

[0061] S2: injecting dense-phase carbon dioxide into the pressure-bearing pipeline 3 by using the carbon dioxide injection device 1, opening the leakage port 311 when the pressure in the pressure-bearing pipeline 3 reaches the preset pressure, and then stopping the injection of dense-phase carbon dioxide into the pressure-bearing pipeline 3 by using the carbon dioxide injection device 1;

[0062] S3: monitoring the soil temperature by using the plurality of temperature sensors 4, and transmitting the soil temperature to the temperature collection device.

[0063] The carbon dioxide pipeline leakage simulation method of the embodiment of the present application uses the plurality of temperature sensors 4 to monitor the soil temperature in real time, transmits the soil temperature monitored by the plurality of temperature sensors 4 to the temperature collection device, analyzes the received soil temperature by using the temperature collection device, so as to understand the influence of the dense-phase carbon dioxide pipeline leakage on the soil temperature distribution and the diffusion law, and provides a theoretical basis for the leakage prevention and control and emergency disposal of the dense-phase carbon dioxide in actual application.

[0064] Optionally, in step S1, before filling the soil in the pressure-bearing cavity, a lower-pressure gaseous carbon dioxide is injected into the pressure-bearing pipeline 3 for air tightness check.

[0065] It can be understood that in actual application, a leakage monitoring device is arranged around the high-pressure dense-phase carbon dioxide pipeline during the pipeline transportation process, and when the pipeline leaks, the injection of dense-phase carbon dioxide into the carbon dioxide pipeline should be immediately stopped; thus, in step S2, the dense-phase carbon dioxide injection device 1 is used to stop the injection of dense-phase carbon dioxide into the pressure-bearing pipeline 3 after the leakage opening 311 is opened, so that the authenticity of the pipeline leakage simulation can be improved, and the experimental results are more referable.

[0066] Optionally, in step S3, when the soil temperature collected by the temperature collection device is stable, the experiment is ended, the temperature collection work is stopped, the soil in the pressure-bearing container 2 is dug out, and the blasting valve assembly 31 is disassembled.

[0067] It can be understood that the above description of the carbon dioxide pipeline leakage simulation system 100 is also applicable to the experimental method, and will not be repeated here.

[0068] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0069] In addition, the terms "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0070] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected or in communication with each other; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0071] In the present application, unless specifically stated and limited otherwise, a first feature "on" or "under" a second feature can be directly in contact with the second feature, or indirectly in contact with the second feature through an intermediate medium. Also, a first feature "over", "above" and "on top of" a second feature can be directly above or obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature. A first feature "under", "below" and "underneath" a second feature can be directly below or obliquely below the second feature, or simply means that the first feature is horizontally lower than the second feature.

[0072] In the present application, the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" mean that a particular feature, structure, material or characteristic is included in at least one embodiment or example of the present application. Exemplary representations of the above terms in the specification are not necessarily directed to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics can be combined in any suitable manner in one or more embodiments or examples. In addition, different embodiments or examples described in the specification and features of different embodiments or examples can be combined and combined by those skilled in the art without contradiction.

[0073] Although the embodiments of the present application have been shown and described above, it is understood that the above-described embodiments are exemplary, and should not be construed as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above-described embodiments within the scope of the present application.

Claims

1. A carbon dioxide pipeline leakage simulation system, characterized in that, include: A carbon dioxide injection device having a fluid outlet for discharging dense-phase carbon dioxide; A pressure vessel having a pressure chamber for filling with soil; A pressure-bearing pipeline is disposed within the pressure-bearing cavity, the pressure-bearing pipeline is connected to the fluid outlet, and the pressure-bearing pipeline has a leakage port; A temperature monitoring device, comprising multiple temperature sensors arranged at intervals within the pressure chamber; A temperature acquisition device is provided, wherein multiple temperature sensors are electrically connected to the temperature acquisition device to receive and process the soil temperature monitored by the temperature sensors.

2. The carbon dioxide pipeline leakage simulation system according to claim 1, characterized in that, The pressure-bearing pipeline is connected to a burst valve assembly to form the leak when the burst valve assembly bursts.

3. The carbon dioxide pipeline leakage simulation system according to claim 2, characterized in that, The diameter of the leak outlet is 1mm to 10mm.

4. The carbon dioxide pipeline leakage simulation system according to claim 1, characterized in that, The pressure-bearing pipe is located at the bottom of the pressure-bearing cavity, and the leakage port is arranged facing upwards. The temperature monitoring device also includes multiple rods, which are arranged at intervals. The rods extend vertically and are located inside the pressure-bearing cavity. Each rod is equipped with multiple temperature sensors, which are arranged at intervals along the extension direction of the rod.

5. The carbon dioxide pipeline leakage simulation system according to claim 4, characterized in that, The distance between two temperature sensors located on the same rod and arranged adjacent to each other is 8cm to 12cm.

6. The carbon dioxide pipeline leakage simulation system according to claim 4, characterized in that, The rods are a first rod, a second rod, a third rod, a fourth rod, a fifth rod, and a sixth rod. The first rod, the second rod, the third rod, and the fourth rod are arranged at intervals along a first direction. The third rod is arranged directly above the leak. The third rod, the fifth rod, and the sixth rod are arranged at intervals along a second direction. The first direction and the second direction intersect.

7. The carbon dioxide pipeline leakage simulation system according to claim 6, characterized in that, The third rod is arranged along the first direction at the midpoint between the first rod and the fourth rod, and the second rod is arranged along the first direction at the midpoint between the first rod and the third rod.

8. The carbon dioxide pipeline leakage simulation system according to claim 4, characterized in that, At least one temperature sensor at the lowest position of the rod is at the same height as the leak port, and at least one temperature sensor at the lowest position of the rod is higher than the leak port.

9. The carbon dioxide pipeline leakage simulation system according to any one of claims 1-8, characterized in that, The carbon dioxide injection device includes a gas container, a refrigeration device, and a pressurization device connected in sequence. The pressurization device has the fluid outlet. The gas container is used to contain gaseous carbon dioxide. The refrigeration device is used to cool the gaseous carbon dioxide output from the gas container. The pressurization device is used to pressurize the gaseous carbon dioxide output from the refrigeration device, so that the gaseous carbon dioxide is converted into dense phase carbon dioxide.

10. A method for simulating carbon dioxide pipeline leakage, characterized in that, Using the experimental apparatus according to any one of claims 1-9, the experimental method includes the following steps: The pressure-bearing pipe and the multiple temperature sensors are placed inside the pressure-bearing cavity, and soil is filled into the pressure-bearing cavity to bury the pressure-bearing pipe and the multiple temperature sensors. The carbon dioxide injection device is used to inject dense phase carbon dioxide into the pressure-bearing pipeline. When the pressure in the pressure-bearing pipeline reaches the preset pressure, the leak port is opened, and then the carbon dioxide injection device is used to stop injecting dense phase carbon dioxide into the pressure-bearing pipeline. The soil temperature is monitored using multiple temperature sensors, and the soil temperature is transmitted to the temperature acquisition device.

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