A carbon dioxide liquefaction system, liquid cargo system and capture system

Abstract

The application provides a carbon dioxide liquefaction system, a liquid cargo system and a capture system, and belongs to the technical field of carbon capture; wherein the liquefaction system comprises a compression device, a liquefaction device and a storage tank device; the storage tank device receives liquid carbon dioxide output by the liquefaction device through a second liquid inlet end, and outputs gaseous carbon dioxide in the storage tank device to the compression device; the compression device re-compresses the gaseous carbon dioxide output by the storage tank device, and then inputs the liquefaction device for liquefaction and storage in the storage tank device; the application re-compresses and liquefies the gaseous carbon dioxide in the storage tank device into liquid carbon dioxide, solves the problem that part of the liquid carbon dioxide in the storage tank is gasified into gaseous carbon dioxide during the storage of the liquid carbon dioxide, causes the loss of the liquid carbon dioxide, and further reduces the liquefaction efficiency of the carbon dioxide, and avoids the loss of the liquid carbon dioxide.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of carbon capture, and particularly relates to a carbon dioxide liquefaction system, a liquid cargo system and a capture system. BACKGROUND

[0002] The carbon dioxide liquefaction system enables carbon dioxide to be stored, transported and utilized in a liquid state. However, during the storage of liquid carbon dioxide in a storage tank, part of the liquid carbon dioxide in the storage tank will be gasified into gaseous carbon dioxide, resulting in the loss of liquid carbon dioxide and thus reducing the carbon dioxide liquefaction efficiency. SUMMARY

[0003] To solve the above problems, the application provides a carbon dioxide liquefaction system, a liquid cargo system and a capture system, which solve the technical problem that, during the storage of liquid carbon dioxide in a storage tank, part of the liquid carbon dioxide in the storage tank will be gasified into gaseous carbon dioxide, resulting in the loss of liquid carbon dioxide and thus reducing the carbon dioxide liquefaction efficiency.

[0004] The application provides a carbon dioxide liquefaction system. The carbon dioxide liquefaction system comprises: a compression device, the compression device comprising a first gas inlet end and a first gas outlet end, the first gas inlet end being configured to receive gaseous carbon dioxide, and the first gas outlet end being configured to output compressed gaseous carbon dioxide; a liquefaction device, the liquefaction device comprising a second gas inlet end and a first liquid outlet end, the second gas inlet end being configured to receive compressed gaseous carbon dioxide, and the first liquid outlet end being configured to output liquid carbon dioxide; and a storage tank device, the storage tank device comprising a first liquid inlet end and a second gas outlet end, the first liquid inlet end being in communication with the first liquid outlet end, and the second gas outlet end being in communication with the first gas inlet end, the first liquid inlet end being configured to receive liquid carbon dioxide, and the second gas outlet end being configured to output gaseous carbon dioxide in the storage tank device.

[0005] In some embodiments, the carbon dioxide liquefaction system further comprises a gas phase circulation pipeline, the second gas outlet end being configured to output gaseous carbon dioxide in the storage tank device to the first gas inlet end through the gas phase circulation pipeline.

[0006] In some embodiments, the carbon dioxide liquefaction system further comprises a pressurization pipeline, the pressurization pipeline comprising a third gas inlet end and a third gas outlet end, and the storage tank device further comprising a fourth gas inlet end, the third gas inlet end being in communication with the first gas outlet end, and the third gas outlet end being in communication with the fourth gas inlet end; the compressed gaseous carbon dioxide is input into the storage tank device through the pressurization pipeline to pressurize the storage tank device.

[0007] In some embodiments, the carbon dioxide liquefaction system further includes: a liquid phase circulation pipeline, the liquid phase circulation pipeline including a second inlet end and a second outlet end, the storage tank device further including a third outlet end, the liquefaction device further including a third inlet end, the second inlet end and the third outlet end being connected, and the second outlet end and the third inlet end being connected; the liquid phase circulation pipeline is used to input liquid carbon dioxide from the storage tank device into the liquefaction device, and input it into the storage tank device via the first inlet end.

[0008] In some embodiments, the compression device includes a compression component and a voltage regulating component. The compression component includes a first end and a second end, and the voltage regulating component includes a third end and a fourth end.

[0009] The first end is configured to be connected to the first air intake end, the second end is connected to the third end, and the fourth end is configured to be connected to the first air outlet end.

[0010] In some embodiments, the carbon dioxide liquefaction system further includes a gas-liquid separation device, which includes a fifth inlet end, a fourth outlet end, and a fourth liquid outlet end. The fifth inlet end is used to receive carbon dioxide raw material gas, the fourth outlet end is used to output dehydrated gaseous carbon dioxide to the first inlet end, and the fourth liquid outlet end is used to output liquid water. The dehydrated gaseous carbon dioxide and the gaseous carbon dioxide in the storage tank device serve as the gas source for the compressed gaseous carbon dioxide.

[0011] In some embodiments, the gas-liquid separation device includes a drying device, which includes a fifth end, a sixth end, and a seventh end. The fifth end is configured to communicate with a fifth air inlet end, the sixth end is configured to communicate with a fourth air outlet end, and the seventh end is configured to communicate with a fourth liquid outlet end.

[0012] In some embodiments, the gas-liquid separation device includes a voltage regulator, which includes an eighth terminal and a ninth terminal. The eighth terminal is configured to communicate with the fifth inlet terminal, and the ninth terminal is configured to communicate with the fifth terminal.

[0013] In some embodiments, the pressure of gaseous carbon dioxide at the second outlet is greater than the pressure of gaseous carbon dioxide at the first inlet.

[0014] In some embodiments, the pressure of liquid carbon dioxide at the first outlet is greater than the pressure of liquid carbon dioxide at the first inlet.

[0015] Accordingly, this application also provides a carbon dioxide liquefaction system, including the carbon dioxide liquefaction system as described in the above embodiments.

[0016] Accordingly, this application also provides a carbon dioxide capture system, including the liquid cargo system as described in the above embodiments.

[0017] The beneficial effects of this application are as follows: This application provides a carbon dioxide liquefaction system, a liquid cargo system, and a capture system. The liquefaction system includes a compression device, a liquefaction device, and a storage tank device. The storage tank device receives liquid carbon dioxide output from the liquefaction device through a second liquid inlet end, and outputs gaseous carbon dioxide from the storage tank device to the compression device. The compression device further compresses the gaseous carbon dioxide output from the storage tank device, and then liquefies it through the liquefaction device before inputting it into the storage tank device for storage. This application solves the problem that during the storage of liquid carbon dioxide, some of the liquid carbon dioxide in the storage tank will vaporize into gaseous carbon dioxide, causing loss of liquid carbon dioxide and thus reducing the liquefaction efficiency of carbon dioxide, by compressing and liquefying the gaseous carbon dioxide in the storage tank device back into liquid carbon dioxide, thereby avoiding the loss of liquid carbon dioxide. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of a carbon dioxide liquefaction system provided in an embodiment of this application;

[0020] Figure 2 A schematic diagram of an example structure of a liquefaction system provided in an embodiment of this application;

[0021] Figure 3 This is another example structural schematic diagram of the liquefaction system provided in the embodiments of this application;

[0022] Figure 4 This is another example structural schematic diagram of a liquefaction system provided in the embodiments of this application;

[0023] Figure 5 This is another example structural schematic diagram of a liquefaction system provided in the embodiments of this application;

[0024] Figure 6 This is another example structural schematic diagram of a liquefaction system provided in the embodiments of this application;

[0025] Figure 7 This is another example structural schematic diagram of a liquefaction system provided in the embodiments of this application;

[0026] Figure 8 A schematic flowchart of a carbon dioxide capture method provided in an embodiment of this application;

[0027] Explanation of reference numerals in the attached figures:

[0028] 10-Compression device, 11-First air inlet, 12-First air outlet, 13-Compression component, 131-First end, 132-Second end, 14-Pressure regulating component, 141-Third end, 142-Fourth end, 20-Liquefaction device, 21-Second air inlet, 22-First liquid outlet, 23-Third liquid inlet, 30-Storage tank device, 31-First liquid inlet, 32-Second air outlet, 33-Fourth air inlet, 34-Third liquid outlet, 35-Fifth air outlet, 40-Gas phase circulation pipeline 50-Pressure charging pipeline, 51-Third air inlet, 52-Third air outlet, 60-Liquid phase circulation pipeline, 61-Second liquid inlet, 62-Second liquid outlet, 63-Shielded pump, 70-Gas-liquid separator, 71-Fifth air inlet, 72-Fourth air outlet, 73-Fourth liquid outlet, 74-Drying device, 741-Fifth end, 742-Sixth end, 743-Seventh end, 75-Voltage stabilizing device, 751-Eighth end, 752-Ninth end, 80-Pressure relief pipeline, 81-Proportional control valve. Detailed Implementation

[0029] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of this application and are not intended to limit this application. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features.

[0030] This application provides a carbon dioxide liquefaction system, a liquid cargo system, and a capture system, which are described in detail below. It should be noted that the order of description of the following embodiments is not intended to limit the preferred order of the embodiments of this application. Furthermore, the descriptions of each embodiment have their own emphasis; parts not described in detail in a certain embodiment can be referred to in the relevant descriptions of other embodiments.

[0031] With increased industrialization and human activity, large amounts of carbon dioxide have been released into the atmosphere, becoming one of the major greenhouse gases. These emissions contribute to global warming, sea-level rise, and ecosystem instability. Capturing carbon dioxide can reduce its concentration in the atmosphere, helping to control global warming and mitigate the effects of climate change. The carbon dioxide liquefaction process offers advantages such as convenient storage and transportation, improved safety, reduced volume, promotion of specific uses, and increased energy density.

[0032] During the liquefaction process using a carbon dioxide liquefaction system, as the amount of liquid carbon dioxide stored in the storage tank increases, more of the liquid carbon dioxide in the tank will vaporize into gaseous carbon dioxide. Combined with the gaseous carbon dioxide that was originally pressurized in the storage tank, this increases the pressure inside the tank. It is necessary to release the gaseous carbon dioxide from the storage tank to maintain the pressure inside the tank within a safe range. However, the release of gaseous carbon dioxide results in the waste of carbon dioxide during the liquefaction process, reduces the liquefaction efficiency of carbon dioxide, and also causes some pollution to the environment by releasing gaseous carbon dioxide into the atmosphere.

[0033] Carbon dioxide liquefaction systems can be applied in industries such as aviation, waste management, steel smelting, cement production, and climate control. By using carbon dioxide liquefaction systems in the carbon dioxide capture process in these fields, carbon dioxide emissions and negative environmental impacts can be effectively reduced, promoting a low-carbon economy and sustainable development.

[0034] To facilitate understanding of this application, this application will use the application of a carbon dioxide liquefaction system in the shipbuilding industry as an example to provide a detailed description of the carbon dioxide liquefaction system of this application.

[0035] In view of this, the liquefaction system includes a compression device, a liquefaction device, and a storage tank device. The storage tank device receives liquid carbon dioxide output from the liquefaction device through a second inlet end, and outputs gaseous carbon dioxide from the storage tank device to the compression device. The compression device further compresses the gaseous carbon dioxide output from the storage tank device, and then liquefies it through the liquefaction device before inputting it into the storage tank device for storage. This application improves the structure of the carbon dioxide liquefaction system to further compress and liquefy the gaseous carbon dioxide in the storage tank device into liquid carbon dioxide, thereby avoiding the loss of liquid carbon dioxide and improving liquefaction efficiency.

[0036] Please see Figure 1 , Figure 1This is a schematic diagram of a carbon dioxide liquefaction system provided in an embodiment of this application. In some embodiments, this application provides a carbon dioxide liquefaction system, which includes: a compression device 10, which includes a first inlet end 11 and a first outlet end 12, wherein the first inlet end 11 is used to receive gaseous carbon dioxide and the first outlet end 12 is used to output compressed gaseous carbon dioxide; a liquefaction device 20, which includes a second inlet end 21 and a first liquid outlet end 22, wherein the second inlet end 21 is used to receive compressed gaseous carbon dioxide and the first liquid outlet end 22 is used to output liquid carbon dioxide; and a storage tank device 30, which includes a first liquid inlet end 31 and a second outlet end 32, wherein the first liquid inlet end 31 is connected to the first liquid outlet end 22 and the second outlet end 32 is connected to the first inlet end 11, wherein the first liquid inlet end 31 is used to receive liquid carbon dioxide and the second outlet end 32 is used to output gaseous carbon dioxide from the storage tank device 30.

[0037] In other words, during the operation of the liquefaction system, when the captured carbon dioxide is stored in the storage tank 30, gaseous carbon dioxide is input into the first inlet 11 of the compression device 10. The compression device 10 compresses the gaseous carbon dioxide and then discharges it from the first outlet 12 to the second inlet 21 of the liquefaction device 20. The compression device 10 compresses the gaseous carbon dioxide to a higher pressure, ensuring it reaches a preset pressure to facilitate liquefaction. The gaseous carbon dioxide input into the first inlet 11 of the compression device 10 can be gaseous carbon dioxide from the storage tank 30, or... It can include captured gaseous carbon dioxide and gaseous carbon dioxide in the storage tank device 30; the liquefaction device 20 converts the compressed gaseous carbon dioxide into liquid carbon dioxide and then discharges it from the first liquid outlet 22 to the first liquid inlet 31 of the storage tank device 30 for storage. The liquefaction device 20 cools the input compressed gaseous carbon dioxide, thereby liquefying the compressed gaseous carbon dioxide into liquid carbon dioxide. The cooling in the liquefaction device 20 is to lower the temperature to the liquefaction temperature corresponding to the pressure of the compressed gaseous carbon dioxide, that is, to reach the phase transition point of carbon dioxide from gaseous to liquid, thereby liquefying the compressed gaseous carbon dioxide into liquid carbon dioxide. In addition, during the process of the liquefaction device 20 converting the compressed gaseous carbon dioxide into liquid carbon dioxide and then discharging it from the first liquid outlet 22 to the first liquid inlet 31 of the storage tank device 30 for storage, the storage tank device 30 will also discharge gaseous carbon dioxide of the same volume as the liquid carbon dioxide that enters. The storage tank device 30 then transports the discharged gaseous carbon dioxide through the second gas outlet 32 ​​to the compression device 10 for recompression through the first gas inlet 11, and then inputs it into the storage tank device 30 for storage via the liquefaction device 20. The gaseous carbon dioxide in the storage tank device 30 includes the gaseous carbon dioxide stored in the tank before the liquid carbon dioxide is injected into the storage tank device 30, that is, the gaseous carbon dioxide pressurized by the storage tank device 30. Combined with the liquid carbon dioxide stored in the storage tank device 30, a small amount of gaseous carbon dioxide will be released by flash evaporation due to the change in the storage space volume.

[0038] For example, taking the gaseous carbon dioxide input to the first inlet 11 of the compression device 10 as including both captured gaseous carbon dioxide and gaseous carbon dioxide in the storage tank device 30, the pressure range of the captured gaseous carbon dioxide input to the compression device 10 at the first inlet 11 is 0 kPa to 4 kPa, and the temperature range is 30°C to 40°C. That is, the pressure of the captured gaseous carbon dioxide input to the compression device 10 at the first inlet 11 can be 0 kPa, 1 kPa, 2 kPa, etc. The temperature of the gaseous carbon dioxide captured and input into the compression device 10 at the first inlet end 11 can be any temperature or any range between two of the following: 30℃, 31℃, 32℃, 33℃, 34℃, 35℃, 36℃, 37℃, 38℃, 39℃, and 40℃. The pressure range for the compression device 10 to pressurize the input gaseous carbon dioxide is 15 bar to 20 bar, which is the pressure range of the gaseous carbon dioxide at the first outlet end 12. The pressure range of the compressed gaseous carbon dioxide is 15 bar to 20 bar. The liquefaction device 20 cools the compressed gaseous carbon dioxide to a temperature range of -32°C to -35°C. That is, the pressure range of the liquid carbon dioxide at the first outlet 22 is 15 bar to 20 bar, and the temperature range is -32°C to -35°C. In other words, the pressure of the gaseous carbon dioxide at the first outlet 12 can be any pressure or any range between two of the following: 15 bar, 16 bar, 17 bar, 18 bar, 19 bar, and 20 bar. The temperature of the liquid carbon dioxide at the first outlet 22 can be any temperature or any range between two of the following: -32°C, -33°C, -34°C, and -35°C. Considering the overall performance of the system design, the compression device 10 pressurizes the input gaseous carbon dioxide to a pressure range of 15 bar to 20 bar. The corresponding phase transition temperature of carbon dioxide from gaseous to liquid is -32°C to -27°C. When liquefying carbon dioxide, the temperature and pressure need to be controlled below the critical temperature and pressure to keep the carbon dioxide in a liquid state. The presence of supercooling provides a certain safety margin, ensuring the stability of liquid carbon dioxide. Furthermore, the liquefaction device 20 cools the compressed gaseous carbon dioxide to a temperature range of -32°C to -35°C. Additionally, all pressures mentioned in this application are absolute pressures. In some embodiments, the pressure of the liquid carbon dioxide at the first outlet 22 is greater than the pressure at the first inlet 31. Therefore, based on the pressure difference between the first outlet 22 and the first inlet 31, following the principle of fluid flow from a high-pressure location to a low-pressure location, the liquid carbon dioxide enters the storage tank device 30 from the first outlet 22 via the first inlet 31 for storage.The pressure difference allows liquid carbon dioxide to enter the storage tank 30 from the first outlet 22 through the first inlet 31 for storage, making the structure of the liquefaction system simpler and avoiding the increased complexity of maintenance and management caused by a complex structure.

[0039] For example, the first liquid inlet 31 of the storage tank device 30 can be located at the top of the storage tank device 30, i.e., the storage tank, or it can be located above the maximum liquid level of the storage tank device 30, so as to facilitate the injection of liquid carbon dioxide into the storage tank device 30. The pressure in the storage tank device 30 can be 13 bar, that is, the pressure of gaseous carbon dioxide at the first gas outlet 12 can be 13 bar, thereby ensuring that the pressure difference condition is met between the liquefaction device 20 and the storage tank device 30, and between the storage tank device 30 and the compression device 10, and ensuring that the pressure environment inside the storage tank device is maintained to store liquid carbon dioxide.

[0040] In some embodiments, the pressure of gaseous carbon dioxide at the second outlet 32 ​​is greater than the pressure of gaseous carbon dioxide at the first inlet 11. Therefore, based on the pressure difference between the second outlet 32 ​​and the first inlet 11, the gaseous carbon dioxide enters the compression device 10 from the second outlet 32 ​​of the storage tank device 30 via the first inlet 11 for further compression. This pressure difference allows the gaseous carbon dioxide to enter the compression device 10 from the second outlet 32 ​​via the first inlet 11 for further compression, simplifying the structure of the liquefaction system.

[0041] For example, since the gaseous carbon dioxide in the storage tank device 30 is located above the stored liquid carbon dioxide, the second outlet 32 ​​of the storage tank device 30 can be located at the top of the storage tank device 30 when it is placed, or it can be located above the maximum liquid level of the storage tank device 30. Furthermore, the pressure of the gaseous carbon dioxide at the second outlet 32 ​​is the same as the pressure in the storage tank device 30. Since the first inlet 11 is connected to both the second outlet 32 ​​and the carbon dioxide collection pipeline, and the pressure of the gaseous carbon dioxide in the carbon dioxide collection pipeline is lower than the pressure in the storage tank device 30, when the gas flows into the compression device 10 from the first inlet 11, the pressure of the gaseous carbon dioxide at the second outlet 32 ​​is greater than the pressure of the gaseous carbon dioxide at the first inlet 11.

[0042] Therefore, during the process where the liquefaction device 20 converts compressed gaseous carbon dioxide into liquid carbon dioxide and then discharges it from the first outlet 22 to the first inlet 31 of the storage tank device 30 for storage, the pressure inside the storage tank device 30 is lower than the pressure applied by the compression device 10, and the pressure of the gaseous carbon dioxide input to the first air inlet 11 of the compression device 10 is lower than the pressure inside the storage tank device 30. Consequently, under the action of the pressure difference, liquid carbon dioxide enters the storage tank device 30 from the first outlet 22 via the first inlet 31, while gaseous carbon dioxide enters the compression device 10 from the second outlet 32 ​​via the first air inlet 11 for recompression; this recompresses and liquefies the gaseous carbon dioxide in the storage tank device back into liquid carbon dioxide, avoiding the loss of liquid carbon dioxide and improving liquefaction efficiency.

[0043] In addition, the first liquid inlet 31 of the storage tank device 30 receives liquid carbon dioxide output from the liquefaction device 20. A device such as a pump can be used to provide fluid power to transport the liquid carbon dioxide output from the liquefaction device 20 to the storage tank device 30 via the first liquid inlet 31. Similarly, the first air inlet 11 of the compression device 10 receives gaseous carbon dioxide output from the second air outlet 32 ​​of the storage tank device 30. A device such as a compressor or a fan can be used to provide fluid power to transport the gaseous carbon dioxide in the storage tank device 30 to the compression device 10 via the second air outlet 32 ​​and the first air inlet 11. This allows the liquid carbon dioxide to be discharged from the first liquid outlet 22 to the first liquid inlet 31 of the storage tank device 30 for storage even when the pressure difference between the storage tank device 30 and the compression device 10, and between the storage tank device 30 and the liquefaction device 20, is not satisfied. The gaseous carbon dioxide is also allowed to enter the compression device 10 from the second air outlet 32 ​​of the storage tank device 30 via the first air inlet 11 for recompression.

[0044] In some embodiments, the carbon dioxide liquefaction system further includes a gas phase circulation pipeline 40, through which the second outlet 32 ​​outputs gaseous carbon dioxide from the storage tank 30 to the first inlet 11. Specifically, one end of the gas phase circulation pipeline 40 is connected to the second outlet 32, and the other end of the gas phase circulation pipeline 40 is connected to the first inlet 11. That is, the gaseous carbon dioxide in the storage tank 30 is output from the other end of the gas phase circulation pipeline 40 via the second outlet 32 ​​and the second outlet 32, and then enters the compression device 10 through the first inlet 11.

[0045] It should be understood that the first outlet 12 of the compression device 10 is connected to the second inlet 21 of the liquefaction device 20 via a pipeline, allowing the gaseous carbon dioxide output from the compression device 10 to be transported to the liquefaction device 20 via the pipeline; the first liquid outlet 22 of the liquefaction device 20 is connected to the first liquid inlet 31 of the storage tank device 30 via a pipeline, allowing the liquid carbon dioxide output from the liquefaction device 20 to be transported to the storage tank device 30 via the pipeline, and since the medium passing through the pipeline is liquid carbon dioxide, the outer layer of the pipeline is wrapped with a heat insulation layer; in addition, the storage tank device 30 for storing liquid carbon dioxide is a pressure vessel, which can be made of cryogenic steel, and can be equipped with pressure sensors, liquid level sensors, temperature sensors, etc., to detect the pressure, temperature and liquid level inside the tank, ensuring system safety, and the storage tank device 30 contains gaseous carbon dioxide before storing liquid carbon dioxide for liquid carbon dioxide storage. In this application, the liquid carbon dioxide storage tank device 30 is used to store carbon dioxide after compression and liquefaction, which can be unloaded after the ship docks and transported to the factory for unified processing.

[0046] In this application, each pipeline can be made of stainless steel, and the material can be 304 stainless steel; and each pipeline can include fluid control devices such as valves, which can be opened or closed as needed to control the flow direction of fluid in the pipeline or to stop the flow of fluid.

[0047] Based on the above technical solution, the liquefaction system in this application includes a compression device 10, a liquefaction device 20, and a storage tank device 30. The storage tank device 30 receives liquid carbon dioxide output from the liquefaction device 20 through a first liquid inlet 31, and outputs gaseous carbon dioxide from the storage tank device 30 to the compression device 10. The compression device 10 further compresses the gaseous carbon dioxide output from the storage tank device 30, and then liquefies it through the liquefaction device 20 before inputting it into the storage tank device 30 for storage. This application solves the problem that during the storage of liquid carbon dioxide, some of the liquid carbon dioxide in the storage tank will vaporize into gaseous carbon dioxide, causing loss of liquid carbon dioxide and thus reducing the liquefaction efficiency of carbon dioxide, by further compressing and liquefying the gaseous carbon dioxide in the storage tank device 30 into liquid carbon dioxide, thus avoiding the loss of liquid carbon dioxide. Furthermore, the pipeline connecting the storage tank device 30 and the first air inlet 11 of the compression device 10 in this application is used for the further processing of gaseous carbon dioxide in the storage tank device 30, preventing the gaseous carbon dioxide in the storage tank device 30 from being directly discharged into the atmosphere and wasted.

[0048] Please see Figure 2 , Figure 2This is a schematic diagram of an example structure of a liquefaction system provided in an embodiment of this application. In some embodiments, the compression device 10 includes a compression device 13 and a pressure regulating device 14. The compression device 13 includes a first end 131 and a second end 132, and the pressure regulating device 14 includes a third end 141 and a fourth end 142. The first end 131 is configured to communicate with a first air inlet end 11, the second end 132 is configured to communicate with the third end 141, and the fourth end 142 is configured to communicate with a first air outlet end 12.

[0049] In some embodiments, the liquefaction device 20 may be a refrigerator. The refrigerator is used to cool the pressurized gaseous carbon dioxide to the liquefaction temperature corresponding to the current pressure, so that the gaseous carbon dioxide becomes liquid carbon dioxide.

[0050] Based on the above scheme, the compressor 13 is used to pressurize the received gaseous carbon dioxide to a higher pressure, so that the gaseous carbon dioxide reaches the pressure corresponding to the liquefaction temperature set in the liquefaction device; the pressure regulator 14 is used to buffer the gaseous carbon dioxide after being pressurized by the compressor 13, so that the gaseous carbon dioxide enters the subsequent system more smoothly. The pressure regulator 14 can be a pressure vessel made of 316 stainless steel and equipped with a safety valve to ensure system safety; the compressor 13 can be a compressor; in addition, the second end 132 of the compressor 13 and the third end 141 of the pressure regulator 14 can be connected by a pipeline, and the fourth end 142 of the pressure regulator 14 can be connected by a pipeline to the second air inlet 21 of the liquefaction device 20. The pipeline can be made of stainless steel. This application pressurizes gaseous carbon dioxide using a compression device 13 to ensure that the gaseous carbon dioxide meets the pressure required for liquefaction. Additionally, a pressure regulating device 14 balances and regulates the gas pressure within the system, ensuring that the output compressed gaseous carbon dioxide maintains a stable pressure and smoothly enters the liquefaction device 20. A refrigeration device cools the pressurized gaseous carbon dioxide to the liquefaction temperature at the current pressure, thereby obtaining liquid carbon dioxide which is then transferred to the storage tank 30 for storage.

[0051] Please see Figure 3 , Figure 3 Another example structural schematic diagram of the liquefaction system provided in this application embodiment. In some embodiments, the carbon dioxide liquefaction system further includes: a pressurization pipeline 50, which includes a third inlet end 51 and a third outlet end 52; the storage tank device 30 further includes a fourth inlet end 33, the third inlet end 51 being connected to the first outlet end 12, and the third outlet end 52 being connected to the fourth inlet end 33; compressed gaseous carbon dioxide is input into the storage tank device 30 through the pressurization pipeline 50 to pressurize the storage tank device 30.

[0052] When the liquefaction system is put into operation for the first time, the storage tank 30 needs to be pre-pressurized. This serves two purposes: first, to displace and expel the protective gas inside the tank at the factory; and second, to create a suitable environmental pressure for storing liquid carbon dioxide. Therefore, to improve the pre-pressurization efficiency of the storage tank 30 during the initial commissioning of the liquefaction system, this application employs a pressurization pipeline 50. This pipeline connects to the storage tank 30 and also to the pipeline between the compression unit 10 and the liquefaction unit 20. This allows the compressed gaseous carbon dioxide output from the compression unit 10 to directly enter the storage tank 30 through the pressurization pipeline 50, thereby pressurizing the storage tank 30. Specifically, an upward venting method can be used to displace and expel the protective gas inside the tank, simultaneously achieving the pre-pressurization of the storage tank 30.

[0053] In other words, before storing liquid carbon dioxide, the storage tank 30 in the liquefaction system needs to be pressurized. This involves filling the storage tank 30 with gaseous carbon dioxide, thereby discharging the original protective gas and creating a suitable pressure environment for storing liquid carbon dioxide. Furthermore, to facilitate the recompression and liquefaction of the gaseous carbon dioxide in the storage tank 30 during storage, the protective gas inside the tank at the time of manufacture needs to be replaced and discharged to avoid issues with the purity of the collected carbon dioxide. During the pressurization process of the storage tank 30, the fluid in the gas phase circulation pipeline 40 does not... The flow means that the gas in the storage tank device 30 does not flow with the first air inlet 11 of the compression device 10 through the gas phase circulation pipeline 40. The flow of fluid in the gas phase circulation pipeline 40 can be stopped by the fluid control device such as the valve on the pipeline. And when the liquefaction device 20 is closed, the gaseous carbon dioxide does not flow between the second air inlet 21 and the first liquid outlet. That is, the gaseous carbon dioxide in the compression device 10 only enters the storage tank device 30 through the pressurization pipeline 50. At this time, the storage tank device 30 receives the pressurized gaseous carbon dioxide through the fourth air inlet 33 and discharges the protective gas in the original storage tank device 30 to the outside.

[0054] For example, when the liquefaction system is put into operation for the first time, during the pre-pressurization process of the storage tank 30, the fourth air inlet 33 of the storage tank 30 can be located at any position on the storage tank 30. Before storing liquid carbon dioxide, the protective gas pressure range inside the storage tank 30 is normal temperature and pressure, and nitrogen can be used as the protective gas. In some embodiments, the storage tank 30 receives pressurized gaseous carbon dioxide through the fourth air inlet 33. At the same time, since the pressure applied by the compression device 10 is greater than the normal pressure, the original protective gas in the storage tank 30 is discharged by upward air discharge. After a preset time, the gas discharge from the storage tank 30 is stopped, but gaseous carbon dioxide continues to be pressurized into the storage tank 30 through the pressurization pipeline 50 until the pressure environment for maintaining the storage of liquid carbon dioxide in the storage tank 30 is met. Then, the pressurization of the storage tank 30 is stopped, thus completing the pressurization of the storage tank 30. The pressurization pipeline 50 may include fluid control devices such as valves, which can be opened during pressurization and closed after pressurization is completed.

[0055] In some embodiments, the storage tank 30 receives pressurized gaseous carbon dioxide through the fourth air inlet 33. Simultaneously, because the pressure applied by the compression device 10 is greater than atmospheric pressure, the original protective gas in the storage tank 30 is discharged through upward air displacement. After a preset time, the gas discharge from the storage tank 30 stops, but gaseous carbon dioxide continues to be pressurized into the storage tank 30 through the pressurization pipeline 50 until the pressure in the storage tank 30 reaches a threshold value. This pressure threshold can be 7 bar, and can be specifically set. The pressure at which the gas discharge from the storage tank 30 stops after a preset time can be used as the threshold value. Then, the liquefaction device 20 is opened, allowing... The valve prevents gaseous carbon dioxide from passing through the pressurization pipeline 50. Instead, the compressed gaseous carbon dioxide output from the compression device enters the liquefaction device 20 for cooling. After cooling, it enters the storage tank 30 via the first liquid outlet 22 and the first liquid inlet 31, achieving a cooling effect within the storage tank 30. This ensures that the pressure and temperature within the storage tank 30 reach the preset operating conditions for liquid carbon dioxide storage. Simultaneously, the gas in the storage tank 30 circulates with the first air inlet 11 of the compression device 10 through the gas phase circulation pipeline 40, further processing the gaseous carbon dioxide within the storage tank 30 and preventing its direct discharge into the atmosphere, thus avoiding waste. It should be understood that during the pre-pressurization process of the storage tank 30, if the pressure inside the tank does not meet the pressure environment required for maintaining liquid carbon dioxide storage, the liquid carbon dioxide output from the liquefaction device 20 will be converted into gaseous carbon dioxide within the storage tank. Ultimately, the pressure within the storage tank 30 is maintained at 13 bar, and the temperature at -32°C.

[0056] Based on the above technical solution, this application designs a pressurization pipeline 50 that directly connects the gaseous carbon dioxide pressurized by the compression device 10 to the storage tank device 30. This pipeline is used to realize the replacement of the protective gas in the storage tank device 30 during the first operation of the system and the pre-pressurization function of the storage tank device 30. This allows the protective gas in the tank at the time of leaving the factory to be replaced and discharged, preventing the collected carbon dioxide from being mixed with other components and causing purity problems. It also creates a suitable environmental pressure for storing liquid carbon dioxide. In addition, it improves the pre-pressurization efficiency of the storage tank device 30 during the first operation and commissioning of the system, thereby improving the carbon dioxide capture and storage efficiency.

[0057] Please see Figure 4 , Figure 4 This is a schematic diagram of another example structure of the liquefaction system provided in the embodiments of this application. In some embodiments, the carbon dioxide liquefaction system further includes: a liquid phase circulation pipeline 60, which includes a second inlet end 61 and a second outlet end 62; the storage tank device 30 further includes a third outlet end 34; and the liquefaction device 20 further includes a third inlet end 23. The second inlet end 61 is connected to the third outlet end 34, and the second outlet end 62 is connected to the third inlet end 23. The liquid phase circulation pipeline 60 is used to input liquid carbon dioxide from the storage tank device 30 into the liquefaction device 20, and input it into the storage tank device 30 via the first inlet end 31.

[0058] Once the liquefaction system completes its operation, either by reaching the preset liquid level in the storage tank 30 and completing the storage, or by stopping the liquefaction system, the system is in a shutdown state. Because the storage tank 30 continuously exchanges heat with the external environment, the internal temperature rises continuously, causing the liquid carbon dioxide inside to continuously generate BOG (Boiled Oxygen Gas). This process of liquid carbon dioxide vaporizing into gaseous carbon dioxide is called BOG. ​​The pressure inside the tank also rises synchronously until the safety valve of the storage tank 30 is activated to release the gaseous carbon dioxide and reduce the pressure. However, this reduces the actual carbon dioxide liquefaction efficiency, thus affecting the capture efficiency of the marine carbon dioxide capture system. Therefore, to improve the long-term storage capacity of the storage tank 30, this application uses a liquid phase circulation pipeline 60 to connect the storage tank 30 to the liquefaction device 20. A small amount of liquid carbon dioxide stored in the storage tank 30 is returned to the liquefaction device 20 for cryogenic treatment. The treated cryogenic liquid carbon dioxide then flows back to the top of the storage tank 30 for spray cooling.

[0059] For example, the third liquid outlet 34 of the storage tank device 30 can be set at the bottom liquid collection well position when the storage tank device 30 is placed; the storage tank device 30 can guide the liquid carbon dioxide stored in the storage tank device 30 back to the liquefaction device 20; the liquid carbon dioxide guided back to the liquefaction device 20 by the storage tank device 30 can be specifically set based on the design volume, liquid storage capacity and design process of the storage tank, and this application does not limit this.

[0060] Based on the above scheme, this application designs a liquid phase circulation pipeline 60, which connects the storage tank device 30 and the liquefaction device 20. The preset amount of liquid carbon dioxide stored in the storage tank device 30 is led back to the liquefaction device 20 for cryogenic treatment. The treated low-temperature liquid carbon dioxide flows back to the top of the storage tank device 30 for spray cooling, reducing the BOG generation rate in the tank, thereby extending the non-destructive storage time of the storage tank device 30.

[0061] Please see Figure 5 , Figure 5 This is a schematic diagram of another example structure of the liquefaction system provided in the embodiments of this application. In some embodiments, the carbon dioxide liquefaction system further includes: a gas-liquid separation device 70, which includes a fifth inlet end 71, a fourth outlet end 72, and a fourth liquid outlet end 73. The fifth inlet end 71 is used to receive carbon dioxide raw material gas, the fourth outlet end 72 is used to output dehydrated gaseous carbon dioxide to the first inlet end 11, and the fourth liquid outlet end 73 is used to output liquid water; wherein, the dehydrated gaseous carbon dioxide and the gaseous carbon dioxide in the storage tank device 30 serve as the gas source for compressed gaseous carbon dioxide.

[0062] Here, "gas source" refers to the origin of the gas; specifically, the compressed gaseous carbon dioxide is obtained by compressing dehydrated gaseous carbon dioxide and gaseous carbon dioxide in storage tank 30. The carbon dioxide feed gas can be a gas containing gaseous carbon dioxide obtained through chemical absorption. The fourth outlet 72 is connected to the first inlet 11 via a pipeline. The fourth outlet 72 is used to output dehydrated gaseous carbon dioxide to the first inlet 11, that is, the fourth outlet 72 outputs the captured gaseous carbon dioxide to the first inlet 11.

[0063] Based on the above scheme, the method of obtaining gaseous carbon dioxide by chemical absorption usually produces a certain amount of water vapor. In order to ensure the purity and quality of carbon dioxide, it is necessary to remove the water vapor from the carbon dioxide raw material gas. This application designs a gas-liquid separation device 70 to remove the water vapor from the carbon dioxide raw material gas. On the one hand, it ensures the purity and quality of carbon dioxide, and on the other hand, it reduces the damage of water vapor to pipelines and equipment in the liquefaction system, which can reduce the possibility of corrosion and extend the service life of the equipment.

[0064] Please see Figure 6 , Figure 6This is a schematic diagram of another example structure of the liquefaction system provided in the embodiments of this application. In some embodiments, the gas-liquid separation device 70 includes a drying device 74, which includes a fifth end 741, a sixth end 742, and a seventh end 743. The fifth end 741 is configured to communicate with the fifth air inlet end 71, the sixth end 742 is configured to communicate with the fourth air outlet end 72, and the seventh end 743 is configured to communicate with the fourth liquid outlet end 73.

[0065] In some embodiments, the gas-liquid separation device 70 includes a voltage regulator 75, which includes an eighth terminal 751 and a ninth terminal 752. The eighth terminal 751 is configured to communicate with the fifth air inlet terminal 71, and the ninth terminal 752 is configured to communicate with the fifth terminal 741.

[0066] For example, the voltage regulator 75 can be a pressure regulator tank made of 316 stainless steel, containing gaseous carbon dioxide with supersaturated water vapor. That is, the carbon dioxide raw material gas enters the pressure regulator tank through a stainless steel pipe to regulate the pressure of the incoming gaseous carbon dioxide, so that the gaseous carbon dioxide enters the subsequent system more smoothly.

[0067] The drying device 74 can be a dryer, which needs to have refrigeration capacity to cool the gaseous carbon dioxide containing supersaturated water vapor after it has passed through the pressure regulating tank. This cools the gaseous carbon dioxide, causing the water vapor it carries to turn into liquid water and be discharged, thus achieving gas-liquid separation and preventing a large amount of water vapor from entering the compression device 10. The dew point temperature range for the dryer's cooling is -50℃ to -70℃.

[0068] Based on the above scheme, this application designs a voltage regulator 75 and a dryer 74. Gaseous carbon dioxide containing supersaturated water vapor, i.e., the carbon dioxide raw material gas, can enter this liquid system through a stainless steel pipe, first entering the voltage regulator 75. The voltage regulator 75 buffers the gaseous carbon dioxide, allowing it to pass through the stainless steel pipe in a more stable state into the dryer 74 for cooling. This causes the water vapor to turn into liquid water and be discharged, achieving gas-liquid separation and dehydration of the gas. This ensures the purity and quality of the carbon dioxide, reduces the possibility of water vapor corrosion of the equipment, and extends the service life of the equipment.

[0069] Please see Figure 7 , Figure 7 This is another example structural schematic diagram of the liquefaction system provided in the embodiments of this application. Figure 7The partial structure of the liquefaction system has been described in the above embodiments and will not be repeated here. In some embodiments, the liquefaction system in this application further includes a pressure relief pipeline 80, which includes a proportional control valve 81. The storage tank device 30 also includes a fifth vent 35. One end of the pressure relief pipeline 80 is connected to the fifth vent 35, and the other end of the pressure relief pipeline 80 discharges gaseous carbon dioxide from the storage tank device 30. One end of the proportional control valve 81 is configured to be connected to one end of the pressure relief pipeline 80, and the other end of the proportional control valve 81 is configured to be connected to the other end of the pressure relief pipeline 80. In some embodiments, the fifth vent 35 can be located at the top of the storage tank device 30 when it is placed, or it can be located above the maximum liquid level of the liquid storage in the storage tank device 30. Before storing liquid carbon dioxide, during the pressurization process of the storage tank 30 in the liquefaction system, the pressure relief pipeline 80 releases the protective gas inside the storage tank 30 into the atmosphere through the proportional control valve 81. This is used to regulate the pressure inside the tank and ensure that the pressure environment required for storing liquid carbon dioxide is met. Specifically, the pressure of liquid carbon dioxide at the first outlet 22 is greater than the pressure at the first inlet 31, and the pressure of gaseous carbon dioxide at the second outlet 32 ​​is greater than the pressure at the first inlet 11. Specifically, the pressure data inside the tank can be obtained based on the pressure sensor equipped with the storage tank 30, and then the proportional control valve 81 can be controlled to ensure that the pressure inside the storage tank 30 is maintained at a pressure environment sufficient for storing liquid carbon dioxide. The proportional control valve 81 is a device for regulating fluid flow. Its function is to adjust the valve opening according to the change of the input signal to control the fluid flow. For example, the pressure data inside the tank can be obtained by the pressure sensor equipped with the storage tank device 30 through the control module. Combined with the pressure threshold of the pressure environment in the storage tank device 30 that meets the requirements for maintaining the storage of liquid carbon dioxide, the signal is transmitted to control the proportional control valve 81. The control module can be implemented by a microcontroller or the like.

[0070] It should be understood that the first liquid inlet 31, the second gas outlet 32, the fourth gas inlet 33, the third liquid outlet 34, and the fifth gas outlet 35 of the storage tank device are located at different positions on the storage tank device.

[0071] In some embodiments, during the operation of the liquefaction system, when the captured carbon dioxide is stored in the storage tank device 30, the pressure relief pipeline 80 discharges the gaseous carbon dioxide in the storage tank device 30 into the atmosphere through the proportional control valve 81, so that the storage pressure inside the storage tank device 30 is maintained at a pressure environment that meets the requirements for storing liquid carbon dioxide.

[0072] In some embodiments, the liquid circulation pipeline 60 in this application includes a shielded pump 63. One end of the shielded pump 63 is configured to communicate with a second inlet 61, and the other end of the shielded pump 63 is configured to communicate with a second outlet 62. The shielded pump 63 provides fluid pressure and flow rate to transfer the liquid. After the liquefaction system completes its operation, the storage tank 30 can use the shielded pump 63 to return the stored liquid carbon dioxide to the liquefaction unit 20 via the liquid circulation pipeline 60. The shielded pump 63 can be controlled by a control module.

[0073] Accordingly, this application also provides a carbon dioxide liquefaction system, including the carbon dioxide liquefaction system as described in the above embodiments.

[0074] A carbon dioxide liquefaction system is used to convert carbon dioxide gas into liquid carbon dioxide, bringing the gas to liquefaction conditions for easier storage and transportation. A carbon dioxide liquefaction cargo system is used for transporting and storing liquid carbon dioxide, and includes a liquefaction system, storage containers, pipelines, and related control and safety equipment. The liquefaction system in this application improves the pre-pressurization efficiency during initial system commissioning through the pressurization pipeline 50, enhances liquefaction efficiency and avoids carbon dioxide waste through the gas phase circulation pipeline 40, and extends the non-destructive storage time in the storage tank 30 through the liquid phase circulation pipeline 60; thereby improving the convenience and stability of carbon dioxide liquefaction cargo system storage and transportation.

[0075] Accordingly, this application also provides a carbon dioxide capture system, including the liquid cargo system as described in the above embodiments.

[0076] A carbon dioxide capture system is a system used to capture and separate carbon dioxide gas from industrial emission sources or the air. The liquefaction system in this application improves liquefaction efficiency and avoids carbon dioxide waste through the gas phase circulation pipeline 40, and extends the non-destructive storage time in the storage tank device 30 through the liquid phase circulation pipeline 60; thereby improving the convenience and stability of carbon dioxide liquefied cargo system storage and transportation, and further enhancing the capture efficiency and system stability of the carbon dioxide capture system.

[0077] Please see Figure 8 , Figure 8 This is a schematic flowchart illustrating a carbon dioxide capture method provided in an embodiment of this application. Accordingly, this application also provides a carbon dioxide capture method employing the carbon dioxide liquefaction system as described in the above embodiment; the carbon dioxide capture method includes the following steps:

[0078] The compression device 10 receives gaseous carbon dioxide and outputs compressed gaseous carbon dioxide.

[0079] The liquefaction unit 20 receives compressed gaseous carbon dioxide and outputs liquid carbon dioxide.

[0080] Liquid carbon dioxide is received through the storage tank device 30, and gaseous carbon dioxide in the storage tank device 30 is output to the compression device 10.

[0081] The carbon dioxide liquefaction system in this application includes a compression device 10, a liquefaction device 20, and a storage tank device 30. The storage tank device receives liquid carbon dioxide output from the liquefaction device 20 through a first inlet 31, and outputs gaseous carbon dioxide from the storage tank device 30 to the compression device 10. The compression device 10 further compresses the gaseous carbon dioxide output from the storage tank device 30, and then liquefies it through the liquefaction device 20 before inputting it into the storage tank device 30 for storage. This application solves the problem that some of the liquid carbon dioxide in the storage tank will vaporize into gaseous carbon dioxide during the storage process, causing liquid carbon dioxide loss and reducing the liquefaction efficiency, by further compressing and liquefying the gaseous carbon dioxide in the storage tank device 30. Furthermore, the gas phase circulation pipeline 40 improves the liquefaction efficiency and avoids carbon dioxide waste, while the liquid phase circulation pipeline 60 extends the lossless storage time in the storage tank device 30. This improves the convenience and stability of the storage and transportation of the carbon dioxide liquefied cargo system, and also enhances the capture efficiency and system stability of the carbon dioxide capture system.

[0082] The above provides a detailed description of a carbon dioxide liquefaction system, a liquid cargo system, and a capture system provided by this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the methods and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A carbon dioxide liquefaction system, characterized in that, include: The compression device (10) includes a first inlet end (11) and a first outlet end (12). The first inlet end (11) is used to receive gaseous carbon dioxide, and the first outlet end (12) is used to output compressed gaseous carbon dioxide. The liquefaction device (20) includes a second air inlet (21) and a first liquid outlet (22). The second air inlet (21) is used to receive the compressed gaseous carbon dioxide, and the first liquid outlet (22) is used to output liquid carbon dioxide. The storage tank device (30) includes a first liquid inlet (31) and a second gas outlet (32). The first liquid inlet (31) is connected to the first liquid outlet (22), and the second gas outlet (32) is connected to the first gas inlet (11). The first liquid inlet (31) is used to receive the liquid carbon dioxide, and the second gas outlet (32) is used to output the gaseous carbon dioxide in the storage tank device (30). The gas phase circulation pipeline (40) is used to output gaseous carbon dioxide from the storage tank device (30) to the first inlet end (11) via the second outlet end (32). The compressed gaseous carbon dioxide is introduced into the storage tank device (30) through the pressurization pipeline (50) to pressurize the storage tank device (30).

2. The carbon dioxide liquefaction system according to claim 1, characterized in that, The pressurization pipeline (50) includes a third air inlet (51) and a third air outlet (52). The storage tank device (30) also includes a fourth air inlet (33). The third air inlet (51) is connected to the first air outlet (12), and the third air outlet (52) is connected to the fourth air inlet (33).

3. The carbon dioxide liquefaction system according to claim 1, characterized in that, Also includes: The liquid phase circulation pipeline (60) includes a second liquid inlet (61) and a second liquid outlet (62). The storage tank device (30) also includes a third liquid outlet (34). The liquefaction device (20) also includes a third liquid inlet (23). The second liquid inlet (61) is connected to the third liquid outlet (34), and the second liquid outlet (62) is connected to the third liquid inlet (23). The liquid circulation pipeline (60) is used to input liquid carbon dioxide from the storage tank device (30) into the liquefaction device (20) and into the storage tank device (30) via the first liquid inlet end (31).

4. The carbon dioxide liquefaction system according to claim 1, characterized in that, The compression device (10) includes a compression device (13) and a pressure regulating device (14). The compression device (13) includes a first end (131) and a second end (132). The pressure regulating device (14) includes a third end (141) and a fourth end (142). The first end (131) is configured to communicate with the first air inlet end (11), the second end (132) is configured to communicate with the third end (141), and the fourth end (142) is configured to communicate with the first air outlet end (12).

5. The carbon dioxide liquefaction system according to claim 1, characterized in that, Also includes: A gas-liquid separation device (70) includes a fifth inlet (71), a fourth outlet (72), and a fourth liquid outlet (73). The fifth inlet (71) is used to receive carbon dioxide raw material gas, the fourth outlet (72) is used to output dehydrated gaseous carbon dioxide to the first inlet (11), and the fourth liquid outlet (73) is used to output liquid water. The dehydrated gaseous carbon dioxide and the gaseous carbon dioxide in the storage tank device (30) serve as the gas source for the compressed gaseous carbon dioxide.

6. The carbon dioxide liquefaction system according to claim 5, characterized in that, The gas-liquid separation device (70) includes a drying device (74), which includes a fifth end (741), a sixth end (742), and a seventh end (743). The fifth end (741) is configured to communicate with the fifth air inlet end (71), the sixth end (742) is configured to communicate with the fourth air outlet end (72), and the seventh end (743) is configured to communicate with the fourth liquid outlet end (73).

7. The carbon dioxide liquefaction system according to claim 6, characterized in that, The gas-liquid separation device (70) includes a voltage regulator (75), which includes an eighth terminal (751) and a ninth terminal (752). The eighth terminal (751) is configured to communicate with the fifth air inlet terminal (71), and the ninth terminal (752) is configured to communicate with the fifth terminal (741).

8. The carbon dioxide liquefaction system according to claim 1, characterized in that, The pressure of the gaseous carbon dioxide at the second outlet (32) is greater than the pressure of the gaseous carbon dioxide at the first inlet (11).

9. A carbon dioxide liquefaction system according to claim 1, characterized in that, The pressure of the liquid carbon dioxide at the first outlet (22) is greater than the pressure of the liquid carbon dioxide at the first inlet (31).

10. A carbon dioxide liquefied cargo system, characterized in that, Includes the carbon dioxide liquefaction system as described in any one of claims 1-9.

11. A carbon dioxide capture system, characterized in that, Including the liquid cargo system as described in claim 10.

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