Carbon dioxide liquefaction system, liquid cargo system and trapping system

Abstract

The invention provides a carbon dioxide liquefaction system, a liquid cargo system and a carbon dioxide capture system, and belongs to the technical field of carbon capture. Wherein the liquefying system comprises a compression device, a liquefying device and a storage tank device, the storage tank device receives liquid carbon dioxide output by the liquefying device through a second liquid inlet end and outputs gaseous carbon dioxide in the storage tank device into the compression device, and the compression device recompresses the gaseous carbon dioxide output by the storage tank device and outputs the compressed gaseous carbon dioxide into the storage tank device. Then liquefying by the liquefying device, and inputting into the storage tank device for storage; the gaseous carbon dioxide in the storage tank device is compressed and liquefied into the liquid carbon dioxide again, and the problems that in the liquid carbon dioxide storage process of the storage tank, part of the liquid carbon dioxide in the storage tank is gasified into the gaseous carbon dioxide, loss of the liquid carbon dioxide is caused, and then the liquefaction efficiency of the carbon dioxide is reduced are solved; the loss of liquid carbon dioxide is avoided.

Description

Technical Field

[0001] The present application belongs to the technical field of carbon capture, and specifically relates to a carbon dioxide liquefaction system, a liquid cargo system and a capture system. Background Art

[0002] The carbon dioxide liquefaction system enables carbon dioxide to be stored, transported and utilized in liquid form. However, during the process of storing liquid carbon dioxide in the tank, part of the liquid carbon dioxide in the tank will be vaporized into gaseous carbon dioxide, resulting in the loss of liquid carbon dioxide, thereby reducing the liquefaction efficiency of carbon dioxide. Summary of the invention

[0003] In response to the above problems, the present application provides a carbon dioxide liquefaction system, a liquid cargo system and a capture system, which solve the technical problem that during the process of storing liquid carbon dioxide in the storage tank, part of the liquid carbon dioxide in the storage tank will be vaporized into gaseous carbon dioxide, causing the loss of liquid carbon dioxide, thereby reducing the liquefaction efficiency of carbon dioxide.

[0004] The present application provides a carbon dioxide liquefaction system. The carbon dioxide liquefaction system comprises: a compression device, the compression device comprises a first air inlet end and a first air outlet end, the first air inlet end is used to receive gaseous carbon dioxide, and the first air outlet end is used to output compressed gaseous carbon dioxide; a liquefaction device, the liquefaction device comprises a second air inlet end and a first liquid outlet end, the second air inlet end is used to receive compressed gaseous carbon dioxide, and the first liquid outlet end is used to output liquid carbon dioxide; a storage tank device, the storage tank device comprises a first liquid inlet end and a second air outlet end, the first liquid inlet end is connected to the first liquid outlet end, the second air outlet end is connected to the first air inlet end, the first liquid inlet end is used to receive liquid carbon dioxide, and the second air outlet end is used to output gaseous carbon dioxide in the storage tank device.

[0005] In some embodiments, the carbon dioxide liquefaction system further includes: a gas phase circulation pipeline, and the second gas outlet end outputs the 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 also includes: a charging pipeline, the charging pipeline includes a third air inlet end and a third air outlet end, the storage tank device also includes a fourth air inlet end, the third air inlet end is connected to the first air outlet end, and the third air outlet end is connected to the fourth air inlet end; the compressed gaseous carbon dioxide is input into the storage tank device through the charging pipeline to pressurize the storage tank device.

[0007] In some embodiments, the carbon dioxide liquefaction system also includes: a liquid phase circulation pipeline, the liquid phase circulation pipeline includes a second liquid inlet end and a second liquid outlet end, the storage tank device also includes a third liquid outlet end, the liquefaction device also includes a third liquid inlet end, the second liquid inlet end is connected to the third liquid outlet end, and the second liquid outlet end is connected to the third liquid inlet end; the liquid phase circulation pipeline is used to transport the liquid carbon dioxide in the storage tank device into the liquefaction device, and then into the storage tank device through the first liquid inlet end.

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

[0009] The first end is configured to communicate with the first air inlet end, the second end is configured to communicate with the third end, and the fourth end is configured to communicate with the first air outlet end.

[0010] In some embodiments, the carbon dioxide liquefaction system also includes: a gas-liquid separation device, the gas-liquid separation device includes a fifth air inlet end, a fourth air outlet end, and a fourth liquid outlet end, the fifth air inlet end is used to receive the carbon dioxide raw gas, the fourth air outlet end is used to output dehydrated gaseous carbon dioxide to the first air inlet end, and the fourth liquid outlet end is used to output liquid water; wherein 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 be connected to the fifth air inlet end, the sixth end is configured to be connected to the fourth air outlet end, and the seventh end is configured to be connected to the fourth liquid outlet end.

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

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

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

[0015] Correspondingly, the present application also provides a carbon dioxide liquid cargo system, including the carbon dioxide liquefaction system as described in the above embodiment.

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

[0017] The beneficial effect of the present application is that the present application provides a carbon dioxide liquefaction system, a liquid cargo system and a capture system, the liquefaction system comprises a compression device, a liquefaction device and a storage tank device, the storage tank device receives the liquid carbon dioxide output by the liquefaction device through a second liquid inlet end, and outputs the 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 liquefies it through the liquefaction device and inputs it into the storage tank device for storage; the present application compresses the gaseous carbon dioxide in the storage tank device into liquid carbon dioxide again, thereby solving the problem that part of the liquid carbon dioxide in the storage tank will be gasified into gaseous carbon dioxide during the storage of liquid carbon dioxide in the storage tank, causing the loss of liquid carbon dioxide, thereby reducing the liquefaction efficiency of carbon dioxide, and avoiding the loss of liquid carbon dioxide. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 A schematic diagram of a carbon dioxide liquefaction system provided in an embodiment of the present application;

[0020] Figure 2 A schematic diagram of an exemplary structure of a liquefaction system provided in an embodiment of the present application;

[0021] Figure 3 Another exemplary structural diagram of a liquefaction system provided in an embodiment of the present application;

[0022] Figure 4 A schematic diagram of another exemplary structure of a liquefaction system provided in an embodiment of the present application;

[0023] Figure 5 A schematic diagram of another exemplary structure of a liquefaction system provided in an embodiment of the present application;

[0024] Figure 6 A schematic diagram of another exemplary structure of a liquefaction system provided in an embodiment of the present application;

[0025] Figure 7 A schematic diagram of another exemplary structure of a liquefaction system provided in an embodiment of the present application;

[0026] Figure 8 A schematic diagram of a process for capturing carbon dioxide provided in an embodiment of the present application;

[0027] Description of reference numerals:

[0028] 10-compression device, 11-first air inlet end, 12-first air outlet end, 13-compression device, 131-first end, 132-second end, 14-pressure regulating device, 141-third end, 142-fourth end, 20-liquefaction device, 21-second air inlet end, 22-first liquid outlet end, 23-third liquid inlet end, 30-storage tank device, 31-first liquid inlet end, 32-second air outlet end, 33-fourth air inlet end, 34-third liquid outlet end, 35-fifth air outlet end, 40-gas phase circulation pipeline , 50-charging pipeline, 51-third air inlet end, 52-third air outlet end, 60-liquid phase circulation pipeline, 61-second liquid inlet end, 62-second liquid outlet end, 63-shielded pump, 70-gas-liquid separation device, 71-fifth air inlet end, 72-fourth air outlet end, 73-fourth liquid outlet end, 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 DESCRIPTION

[0029] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present application. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the present application and are not used to limit the present application. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0030] The present 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 description order of the following embodiments is not intended to limit the preferred order of the embodiments of the present application. In the following embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, please refer to the relevant description of other embodiments.

[0031] With the increase of industrialization and human activities, a large amount of carbon dioxide has been released into the atmosphere in the past, becoming one of the main greenhouse gases. This emission of carbon dioxide has led to global warming, rising sea levels and instability of ecosystems. By capturing carbon dioxide, its concentration in the atmosphere can be reduced, which helps to control global warming and mitigate the effects of climate change. During the capture of carbon dioxide, liquefying carbon dioxide can achieve advantages such as convenient storage and transportation, improved safety, reduced volume, promotion of specific utilization methods and increased energy density.

[0032] During the liquefaction process through the carbon dioxide liquefaction system, as the amount of liquid carbon dioxide stored in the storage tank device increases, the liquid carbon dioxide in the storage tank will be vaporized into gaseous carbon dioxide. Combined with the original pressurized gaseous carbon dioxide in the storage tank, the pressure in the storage tank increases. The gaseous carbon dioxide in the storage tank needs to be discharged to maintain the pressure in the tank within a safe range. However, the release of gaseous carbon dioxide causes a waste of carbon dioxide in the liquefaction process, reduces the liquefaction efficiency of carbon dioxide, and the release of gaseous carbon dioxide into the atmosphere also causes certain pollution to the environment.

[0033] The CO2 liquefaction system can be applied to the aviation industry, waste disposal, steel smelting, cement production, climate control, etc. By applying the CO2 liquefaction system in the process of capturing CO2 in these fields, CO2 emissions and negative environmental impacts can be effectively reduced, and a low-carbon economy and sustainable development can be promoted.

[0034] To facilitate understanding of the present application, in the present application, the carbon dioxide liquefaction system of the present application is introduced in detail by taking the application of the carbon dioxide liquefaction system in the shipping industry as an example.

[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 the liquid carbon dioxide output by the liquefaction device through the second liquid inlet end, and outputs the 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 liquefies it through the liquefaction device and inputs it into the storage tank device for storage. The present application improves the structure of the carbon dioxide liquefaction system to compress the gaseous carbon dioxide in the storage tank device again and liquefy it into liquid carbon dioxide, thereby avoiding the loss of liquid carbon dioxide and improving the liquefaction efficiency.

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

[0037] That is to say, during the operation of the liquefaction system, that is, during the process of storing the captured carbon dioxide in the storage tank device 30, the first air inlet end 11 of the compression device 10 inputs gaseous carbon dioxide, the compression device 10 compresses the gaseous carbon dioxide and then discharges it from the first air outlet end 12 to the second air inlet end 21 of the liquefaction device 20 to enter the liquefaction device 20, wherein the compression device 10 compresses the gaseous carbon dioxide by pressurizing the input gaseous carbon dioxide to a higher pressure so that the gaseous carbon dioxide reaches a preset pressure to facilitate the liquefaction of the gaseous carbon dioxide into liquid carbon dioxide, wherein the gaseous carbon dioxide input at the first air inlet end 11 of the compression device 10 can be the gaseous carbon dioxide in the storage tank device 30, or It may include captured gaseous carbon dioxide and gaseous carbon dioxide in a 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 end 22 to the first liquid inlet end 31 of the storage tank device 30 to enter the storage tank device 30 for storage, wherein the liquefaction device 20 cools the input compressed gaseous carbon dioxide so as to liquefy the compressed gaseous carbon dioxide into liquid carbon dioxide, and the cooling in the liquefaction device 20 is to lower the temperature to a liquefaction temperature corresponding to the pressure of the compressed gaseous carbon dioxide, that is, to reach the phase change point where the carbon dioxide changes from gas to liquid, thereby liquefying the compressed gaseous carbon dioxide into liquid carbon dioxide. In addition, in the process where the liquefaction device 20 converts the compressed gaseous carbon dioxide into liquid carbon dioxide and then discharges it from the first liquid outlet end 22 to the first liquid inlet end 31 of the storage tank device 30 to enter the storage tank device 30 for storage, the storage tank device 30 will also discharge the same volume of gaseous carbon dioxide as the incoming liquid carbon dioxide. The storage tank device 30 then transports the discharged gaseous carbon dioxide through the second gas outlet end 32 to the compression device 10 through the first gas inlet end 11 for recompression, and then inputs it into the storage tank device 30 through the liquefaction device 20 for storage; the gaseous carbon dioxide in the storage tank device 30 includes the gaseous carbon dioxide stored in the tank before the storage tank device 30 is injected with liquid carbon dioxide, that is, the gaseous carbon dioxide pressurized in the storage tank device 30, combined with the liquid carbon dioxide stored in the storage tank device 30, which will flash and release a small amount of gaseous carbon dioxide due to the change in the volume of the storage space.

[0038] For example, the gaseous carbon dioxide inputted into the first air inlet end 11 of the compression device 10 includes the captured gaseous carbon dioxide and the gaseous carbon dioxide in the storage tank device 30. In the present application, the gaseous carbon dioxide captured in the gaseous carbon dioxide inputted into the compression device 10 has a pressure range of 0 kPa to 4 kPa at the first air inlet end 11, and a temperature range of 30° C. to 40° C. That is, the pressure of the gaseous carbon dioxide captured in the gaseous carbon dioxide inputted into the compression device 10 at the first air inlet end 11 can be 0 kPa, 1 kPa, 2 kPa, The temperature of the captured gaseous carbon dioxide input into the compression device 10 at the first air inlet 11 can be any temperature of 30°C, 31°C, 32°C, 33°C, 34°C, 35°C, 36°C, 37°C, 38°C, 39°C, 40°C or a range of values ​​between any two temperatures; the pressure range of the input gaseous carbon dioxide pressurized by the compression device 10 is 15 bar to 20 bar, that is, the pressure range of the gaseous carbon dioxide at the first air outlet 12 is The pressure of the compressed gaseous carbon dioxide at the first liquid outlet 22 is 15 bar to 20 bar, and the temperature range of the compressed gaseous carbon dioxide by the liquefaction device 20 is -32°C to -35°C, that is, the pressure range of the liquid carbon dioxide at the first liquid outlet 22 is 15 bar to 20 bar and the temperature range is -32°C to -35°C, that is, the pressure of the gaseous carbon dioxide at the first gas outlet 12 can be any pressure of 15 bar, 16 bar, 17 bar, 18 bar, 19 bar, 20 bar or a range value between any two pressures, and the temperature of the liquid carbon dioxide at the first liquid outlet 22 can be any temperature of -32°C, -33°C, -34°C, -35°C or a range value between any two temperatures; considering the overall performance of the overall system design, the pressure range of the compressed gaseous carbon dioxide pressurized by the compression device 10 is 15 bar to 20 bar, and the corresponding phase transition point temperature of the carbon dioxide from gas to liquid is -32°C to -27°C; when liquefying carbon dioxide, it is necessary to control the temperature and pressure below the critical temperature and pressure to keep the carbon dioxide in a liquid state. The existence of supercooling can provide a certain safety margin to ensure the stability of liquid carbon dioxide. Furthermore, the temperature range in which the liquefaction device 20 cools the compressed gaseous carbon dioxide is -32°C to -35°C. In addition, the pressures in the present application are all absolute pressures. In some embodiments, the pressure of the liquid carbon dioxide at the first liquid outlet 22 is greater than the pressure of the liquid carbon dioxide at the first liquid inlet 31. Furthermore, based on the pressure difference between the liquid carbon dioxide at the first liquid outlet 22 and the first liquid inlet 31, the fluid flows from a position with high pressure to a position with low pressure, so that the liquid carbon dioxide enters the storage tank device 30 from the first liquid outlet 22 through the first liquid inlet 31 for storage.Based on the pressure difference, the liquid carbon dioxide enters the storage tank device 30 from the first liquid outlet 22 through the first liquid inlet 31 for storage, making the structure of the liquefaction system simpler and avoiding the increase in the complexity of maintenance and management due to the complex structure.

[0039] Exemplarily, the first liquid inlet end 31 of the storage tank device 30 can be arranged at the top of the storage tank device 30, that is, the storage tank, or can be arranged at a position above the maximum liquid level of the liquid storage 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 the gaseous carbon dioxide at the first gas outlet end 12 can be 13 bar, thereby satisfying the pressure difference condition between the liquefaction device 20 and the storage tank device 30, and between the storage tank device 30 and the compression device 10 on the one hand, and satisfying the pressure environment for maintaining the storage of liquid carbon dioxide in the storage tank device on the other hand.

[0040] In some embodiments, the pressure of the gaseous carbon dioxide at the second gas outlet 32 ​​is greater than the pressure of the gaseous carbon dioxide at the first gas inlet 11. Furthermore, based on the pressure difference between the gaseous carbon dioxide at the second gas outlet 32 ​​and the first gas inlet 11, the gaseous carbon dioxide enters the compression device 10 from the second gas outlet 32 ​​of the storage tank device 30 through the first gas inlet 11 for recompression. Based on the pressure difference, the gaseous carbon dioxide enters the compression device 10 from the second gas outlet 32 ​​through the first gas inlet 11 for recompression, so that the structure of the liquefaction system is simple.

[0041] Exemplarily, since the gaseous carbon dioxide in the storage tank device 30 is located at the upper end of the stored liquid carbon dioxide, the second gas outlet 32 ​​of the storage tank device 30 can be set at the top of the upper end when the storage tank device 30 is placed, or can be set at a position above the maximum liquid level of the liquid storage in the storage tank device 30. In addition, the pressure of the gaseous carbon dioxide at the second gas outlet 32 ​​is the pressure in the storage tank device 30. Since the first gas inlet 11 is connected to the second gas outlet 32 ​​and the pipeline for capturing carbon dioxide, respectively, and the pressure of the gaseous carbon dioxide in the pipeline for capturing carbon dioxide is lower than the pressure in the storage tank device 30, when the first gas inlet 11 enters the compression device 10 based on the gas flow, the pressure of the gaseous carbon dioxide at the second gas outlet 32 ​​is higher than the pressure of the gaseous carbon dioxide at the first gas inlet 11.

[0042] In view of this, in the process where 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 to enter the storage tank device 30 for storage, the pressure in the storage tank device 30 is lower than the pressure of the compression device 10, and the pressure of the gaseous carbon dioxide input from the first air inlet 11 of the compression device 10 is lower than the pressure in the storage tank device 30. Therefore, under the action of the pressure difference, the liquid carbon dioxide enters the storage tank device 30 from the first liquid outlet 22 through the first liquid inlet 31 for storage, and the gaseous carbon dioxide enters the compression device 10 from the second air outlet 32 ​​of the storage tank device 30 through the first air inlet 11 for recompression; so that the gaseous carbon dioxide in the storage tank device is recompressed and liquefied into liquid carbon dioxide, thereby avoiding the loss of liquid carbon dioxide and improving the liquefaction efficiency.

[0043] In addition, the first liquid inlet end 31 of the storage tank device 30 receives the liquid carbon dioxide output by the liquefaction device 20, and a device such as a pump that provides fluid power can be used to transport the liquid carbon dioxide output by the liquefaction device 20 to the storage tank device 30 through the first liquid inlet end 31; similarly, the first air inlet end 11 of the compression device 10 receives the gaseous carbon dioxide output by the second air outlet end 32 of the storage tank device 30, and a device such as a compressor or a fan that provides fluid power can be used to transport the gaseous carbon dioxide in the storage tank device 30 through the second air outlet end 32 and the first air inlet end 11 to the compression device 10, so that 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 liquid carbon dioxide can still be discharged from the first liquid outlet end 22 to the first liquid inlet end 31 of the storage tank device 30 to enter the storage tank device 30 for storage, and the gaseous carbon dioxide can enter the compression device 10 from the second air outlet end 32 of the storage tank device 30 through the first air inlet end 11 to be compressed again.

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

[0045] It should be understood that the first gas outlet 12 of the compression device 10 is connected to the second gas inlet 21 of the liquefaction device 20 through a pipeline, so that the gaseous carbon dioxide output by the compression device 10 is transported to the liquefaction device 20 through 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 through a pipeline, so that the liquid carbon dioxide output by the liquefaction device 20 is transported to the storage tank device 30 through the pipeline, and because the medium through the pipeline is liquid carbon dioxide, the outer layer of the pipeline is wrapped with an insulation layer; in addition, the storage tank device 30 for storing liquid carbon dioxide is a pressure vessel, the material can be low-temperature steel, and can be equipped with a pressure sensor, a liquid level sensor, a temperature sensor, etc., for detecting the pressure, temperature and liquid level in the tank, etc., to ensure the safety of the system, and the storage tank device 30 has gaseous carbon dioxide in the storage tank 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 compressed and liquefied carbon dioxide, which can be unloaded and transported to the factory for unified treatment after the ship docks.

[0046] In the present application, each pipeline can be made of stainless steel pipes, and the material can be 304 stainless steel; and each pipeline can include a fluid control device such as a valve, and the valve can be opened or closed as needed to control the flow direction of the fluid in the pipeline or prevent the flow of the fluid.

[0047] Based on the above technical scheme, the liquefaction system in the present application includes a compression device 10, a liquefaction device 20, and a storage tank device 30. The storage tank device 30 receives the liquid carbon dioxide output by the liquefaction device 20 through the first liquid inlet end 31, and outputs the gaseous carbon dioxide in the storage tank device 30 to the compression device 10. The compression device 10 recompresses the gaseous carbon dioxide output by the storage tank device 30, and then liquefies it through the liquefaction device 20 and inputs it into the storage tank device 30 for storage; the present application solves the problem that part of the liquid carbon dioxide in the storage tank will be gasified into gaseous carbon dioxide during the storage of liquid carbon dioxide in the storage tank, causing the loss of liquid carbon dioxide, thereby reducing the liquefaction efficiency of carbon dioxide, and avoiding the loss of liquid carbon dioxide. In addition, the pipeline connecting the storage tank device 30 with the first air inlet end 11 of the compression device 10 in the present application is used for the reprocessing of the gaseous carbon dioxide in the storage tank device 30, so as to avoid the gaseous carbon dioxide in the storage tank device 30 being directly discharged into the atmosphere and causing waste.

[0048] See also Figure 2 , Figure 2An exemplary structural diagram of a liquefaction system provided in an embodiment of the present 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, 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 connected to the third end 141, and the fourth end 142 is configured to communicate with the first air outlet end 12.

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

[0050] Based on the above scheme, the compression device 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 regulating device 14 is used to buffer the gaseous carbon dioxide pressurized by the compression device 13, so that the gaseous carbon dioxide enters the subsequent system more smoothly. Among them, the pressure regulating device 14 can be a pressure vessel, made of 316 stainless steel, and equipped with a safety valve to ensure system safety; the compression device 13 can use a compressor; in addition, the second end 132 of the compression device 13 and the third end 141 of the pressure regulating device 14 can be connected by a pipeline, and the fourth end 142 of the pressure regulating device 14 and the second air inlet end 21 of the liquefaction device 20 can be connected by a pipeline, and the pipeline can be a stainless steel pipe. In the present application, the gaseous carbon dioxide is pressurized by the compression device 13 so that the gaseous carbon dioxide meets the pressure during liquefaction. In addition, the pressure regulating device 14 plays a role in balancing and regulating the gas pressure in the system, so that the compressed gaseous carbon dioxide output maintains a stable pressure and smoothly enters the liquefaction device 20. The refrigeration device cools the pressurized gaseous carbon dioxide to the liquefaction temperature under the current pressure, and then obtains the liquid carbon dioxide and transmits it to the storage tank device 30 for storage.

[0051] See also Figure 3 , Figure 3 Another example structural diagram of the liquefaction system provided in the embodiment of the present application. In some embodiments, the carbon dioxide liquefaction system further includes: a charging pipeline 50, the charging pipeline 50 includes a third air inlet end 51 and a third air outlet end 52, the storage tank device 30 also includes a fourth air inlet end 33, the third air inlet end 51 is connected to the first air outlet end 12, and the third air outlet end 52 is connected to the fourth air inlet end 33; the compressed gaseous carbon dioxide is input into the storage tank device 30 through the charging 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 device 30 needs to be pre-pressurized, firstly, to replace and discharge the protective gas in the tank when leaving the factory, and secondly, to create an environmental pressure suitable for storing liquid carbon dioxide. Furthermore, in order to improve the pre-pressurization efficiency of the storage tank device 30 during the first operation and debugging of the liquefaction system, a charging pipeline 50 is used in this application, that is, the charging pipeline 50 is connected to the storage tank device 30, and is connected to the pipeline between the compression device 10 and the liquefaction device 20, so that the compressed gaseous carbon dioxide output by the compression device 10 directly enters the storage tank device 30 through the charging pipeline 50 to pressurize the storage tank device 30; specifically, the protective gas in the tank can be replaced and discharged by the upward exhaust method, and the pre-pressurization of the storage tank device 30 can be achieved at the same time.

[0053] That is to say, before storing liquid carbon dioxide in the liquefaction system, the storage tank device 30 needs to be pressurized, that is, gaseous carbon dioxide is filled into the storage tank device 30, and then the original protective gas in the storage tank device 30 is discharged, so that the pressure environment in the storage tank is suitable for storing liquid carbon dioxide. In addition, in order to facilitate the storage of liquid carbon dioxide, the gaseous carbon dioxide in the storage tank device 30 is compressed and liquefied again, and then the protective gas in the tank at the time of leaving the factory needs to be replaced and discharged to avoid the purity problem of the collected carbon dioxide; in the process of pressurizing the storage tank device 30, the fluid in the gas phase circulation pipeline 40 is not flow, that is, the gas in the storage tank device 30 and the first air inlet end 11 of the compression device 10 do not circulate through the gas phase circulation pipeline 40, and the flow of fluid in the gas phase circulation pipeline 40 can be prevented by a fluid control device on the pipeline, such as a valve or the like; and the liquefaction device 20 is closed, then the gaseous carbon dioxide does not circulate between the second air inlet end 21 and the first liquid outlet end, that is, the gaseous carbon dioxide in the compression device 10 only enters the storage tank device 30 through the pressurizing pipeline 50; at this time, the storage tank device 30 receives the pressurized gaseous carbon dioxide through the fourth air inlet end 33, and discharges the protective gas originally in the storage tank device 30 to the outside.

[0054] Exemplarily, when the liquefaction system is put into operation for the first time, during the pre-pressurization of the storage tank device 30, the fourth air inlet end 33 of the storage tank device 30 can be set at any position of the storage tank device 30; before the storage tank device 30 stores liquid carbon dioxide, the pressure range of the protective gas in the storage tank is normal temperature and pressure, and the protective gas can be nitrogen; in some embodiments, the storage tank device 30 receives pressurized gaseous carbon dioxide through the fourth air inlet end 33, and at the same time, because the pressure of the compression device 10 is greater than the normal pressure, the original protective gas in the storage tank device 30 is discharged by the upward air exhaust method, and after a preset time, the storage tank device 30 stops discharging gas to the outside, but continues to pressurize the storage tank device 30 through the pressurization pipeline 50 until the storage tank device 30 meets the pressure environment for maintaining the storage of liquid carbon dioxide. Then stop pressurizing the gaseous carbon dioxide into the storage tank device 30, that is, complete the pressurization of the storage tank device 30. Among them, the pressurization pipeline 50 may include a fluid control device such as a valve, and the valve can be opened during pressurization and closed after the pressurization is completed.

[0055] In some embodiments, the storage tank device 30 receives pressurized gaseous carbon dioxide through the fourth air inlet port 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 device 30 is discharged through the upward air exhaust method. After a preset period of time, the storage tank device 30 stops discharging gas to the outside, but continues to pressurize the gaseous carbon dioxide into the storage tank device 30 through the pressure charging pipeline 50 until the pressure in the storage tank device 30 reaches a threshold value, where the pressure threshold value can be 7 bar. Specifically, the pressure when the storage tank device 30 stops discharging gas to the outside after a preset period of time can be set as the threshold value; then, the liquefaction device 20 can be opened, and the gaseous carbon dioxide can be discharged through the pressure charging pipeline 50. The valve prevents the gaseous carbon dioxide from passing through the charging pipeline 50, so that the compressed gaseous carbon dioxide output by the compression device enters the liquefaction device 20 for cooling, and then enters the storage tank device 30 through the first liquid outlet 22 and the first liquid inlet 31, so as to achieve the effect of cooling the storage tank device 30, so that the pressure and temperature in the storage tank device 30 reach the preset working conditions for liquid carbon dioxide storage; at the same time, the gas in the storage tank device 30 and the first gas inlet 11 of the compression device 10 are circulated through the gas phase circulation pipeline 40, which is used for the re-processing of the gaseous carbon dioxide in the storage tank device 30, so as to avoid the gaseous carbon dioxide in the storage tank device 30 being directly discharged into the atmosphere and causing waste. It should be understood that during the pre-charging process of the storage tank device 30, if the pressure in the tank does not meet the pressure environment for maintaining the storage of liquid carbon dioxide, the liquid carbon dioxide output by the liquefaction device 20 will be converted into gaseous carbon dioxide in the storage tank device, and finally the pressure in the storage tank device 30 is maintained at 13 bar and the temperature is maintained at -32 ° C.

[0056] Based on the above technical solution, the present application designs a charging pipeline 50 that directly connects the gaseous carbon dioxide pressurized by the compression device 10 and the storage tank device 30, which is used to realize the replacement of the protective gas in the storage tank device 30 and the pre-pressurization function of the storage tank device 30 when the storage tank device 30 is operated for the first time in the system, so that the protective gas in the tank at the time of leaving the factory is replaced and discharged, and the collected carbon dioxide is prevented from being mixed with other components and causing purity problems; and an environmental pressure suitable for storing liquid carbon dioxide is created; in addition, the pre-pressurization efficiency of the storage tank device 30 in the system during the first operation and debugging is improved, thereby improving the carbon dioxide capture and storage efficiency.

[0057] See also Figure 4 , Figure 4 Another exemplary structural schematic diagram of a liquefaction system provided in an embodiment of the present application. In some embodiments, the carbon dioxide liquefaction system further includes: a liquid phase circulation pipeline 60, the liquid phase circulation pipeline includes a second liquid inlet end 61, a second liquid outlet end 62, the storage tank device 30 also includes a third liquid outlet end 34, the liquefaction device 20 also includes a third liquid inlet end 23, the second liquid inlet end 61 is connected to the third liquid outlet end 34, and the second liquid outlet end 62 is connected to the third liquid inlet end 23; the liquid phase circulation pipeline 60 is used to transfer the liquid carbon dioxide in the storage tank device 30 into the liquefaction device 20, and input it into the storage tank device 30 through the first liquid inlet end 31.

[0058] When the liquefaction system completes its work, that is, the liquid carbon dioxide stored in the tank device 30 reaches the preset liquid level to complete the storage of liquid carbon dioxide or the liquefaction system stops working, the liquefaction system is in a shutdown state. Since the tank device 30 will continuously exchange heat with the external environment, the temperature in the tank will continue to rise, so that the liquid carbon dioxide in the tank will continue to produce BOG, that is, the process of gasification of liquid carbon dioxide to produce gaseous carbon dioxide is called BOG, and the pressure in the tank will also rise synchronously until the safety valve of the tank device 30 is activated to discharge gaseous carbon dioxide to reduce the pressure in the tank, but it will cause the actual carbon dioxide liquefaction efficiency to decrease, thereby affecting the capture efficiency of the marine carbon dioxide capture system. In order to improve the long-term storage capacity of the tank device 30, the liquefaction device of the present application uses a liquid phase circulation pipeline 60 to connect the tank device 30 with the liquefaction device 20, and the small amount of liquid carbon dioxide stored in the tank device 30 is led back to the liquefaction device 20 for deep cold treatment, and the treated low-temperature liquid carbon dioxide is refluxed to the top of the tank device 30 for spraying and cooling.

[0059] Exemplarily, the third liquid outlet 34 of the storage tank device 30 can be set at the position of the liquid collecting well at the bottom of the tank when the storage tank device 30 is placed; the storage tank device 30 can lead the liquid carbon dioxide stored in the storage tank device 30 back to the liquefaction device 20; the liquid carbon dioxide led back to the liquefaction device 20 by the storage tank device 30 can be customized based on the design volume, liquid storage volume and design process of the storage tank, which is not limited in the present application.

[0060] Based on the above scheme, the present application designs a liquid phase circulation pipeline 60, which is used to connect the storage tank device 30 with the liquefaction device 20, and the preset amount of liquid carbon dioxide stored in the storage tank device 30 is led back to the liquefaction device 20 for deep cold treatment. The treated low-temperature liquid carbon dioxide flows back to the top of the storage tank device 30 for spraying and cooling, thereby reducing the generation rate of BOG in the tank, thereby achieving the effect of extending the lossless storage time of the storage tank device 30.

[0061] See also Figure 5 , Figure 5 Another exemplary structural diagram of a liquefaction system provided in an embodiment of the present application. In some embodiments, the carbon dioxide liquefaction system further includes: a gas-liquid separation device 70, the gas-liquid separation device 70 includes a fifth gas inlet end 71, a fourth gas outlet end 72, and a fourth liquid outlet end 73, the fifth gas inlet end 71 is used to receive carbon dioxide raw gas, the fourth gas outlet end 72 is used to output dehydrated gaseous carbon dioxide to the first gas 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 gas sources for the compressed gaseous carbon dioxide.

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

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

[0064] See also Figure 6 , Figure 6Another exemplary structural diagram of a liquefaction system provided in an embodiment of the present application. In some embodiments, the gas-liquid separation device 70 includes a drying device 74, the drying device 74 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 gas inlet end 71, the sixth end 742 is configured to communicate with the fourth gas 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 stabilizing device 75 , which includes an eighth end 751 and a ninth end 752 , wherein the eighth end 751 is configured to communicate with the fifth air inlet end 71 , and the ninth end 752 is configured to communicate with the fifth end 741 .

[0066] Exemplarily, the voltage stabilizing device 75 can be a voltage stabilizing tank made of 316 stainless steel. Gaseous carbon dioxide with supersaturated water vapor, that is, carbon dioxide raw gas enters the voltage stabilizing tank through a stainless steel pipe to adjust the pressure of the incoming gaseous carbon dioxide so that the gaseous carbon dioxide can enter the subsequent system more smoothly.

[0067] The drying device 74 may be a dryer, which needs to have refrigeration capacity and is used to cool the gaseous carbon dioxide with supersaturated water vapor after being buffered by the pressure regulating tank, so that the gaseous carbon dioxide is cooled and the water vapor carried by it is converted into liquid water and discharged, thereby achieving gas-liquid separation and preventing a large amount of water vapor from entering the compression device 10. The dew point temperature range of the dryer is -50°C to -70°C.

[0068] Based on the above scheme, the present application designs a voltage stabilizer 75 and a drying device 74. The gaseous carbon dioxide with supersaturated water vapor, i.e., the carbon dioxide raw gas, can enter the liquid cargo system through a stainless steel pipe, i.e., first enter the voltage stabilizer 75, and then be buffered by the voltage stabilizer 75, so that the gaseous carbon dioxide enters the drying device 74 through the stainless steel pipe in a more stable state for cooling, so that the water vapor is converted into liquid water and discharged, achieving the purpose of gas-liquid separation and gas dehydration and drying. The purity and quality of carbon dioxide are guaranteed, and the possibility of water vapor corroding the equipment is reduced, thereby extending the service life of the equipment.

[0069] See also Figure 7 , Figure 7 A schematic diagram of another exemplary structure of a liquefaction system provided in an embodiment of the present application. Figure 7Part of the structure of the liquefaction system is described in the above embodiments, and will not be repeated here; in some embodiments, the liquefaction system in the present application further includes a pressure relief pipeline 80, the pressure relief pipeline 80 includes a proportional control valve 81, the storage tank device 30 further includes a fifth gas outlet 35, one end of the pressure relief pipeline 80 is connected to the fifth gas outlet 35, the other end of the pressure relief pipeline 80 discharges the gaseous carbon dioxide in 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 gas outlet 35 can be set at the top of the upper end when the storage tank device 30 is placed, and can also be set at a position above the maximum liquid level of the liquid storage of the storage tank device 30. In the liquefaction system, before the storage tank device 30 stores liquid carbon dioxide, during the process of pressurizing the storage tank device 30, the pressure relief pipeline 80 discharges the protective gas in the storage tank device 30 into the atmosphere through the proportional control valve 81, which is used to adjust the pressure in the storage tank to ensure that the pressure environment for storing liquid carbon dioxide is met, that is, the pressure of the liquid carbon dioxide at the first liquid outlet 22 is greater than the pressure of the liquid carbon dioxide at the first liquid inlet 31, and the pressure of the gaseous carbon dioxide at the second gas outlet 32 ​​is greater than the pressure of the gaseous carbon dioxide at the first gas inlet 11. Specifically, the pressure data in the tank can be obtained based on the pressure sensor equipped with the storage tank device 30, and then the proportional control valve 81 can be controlled to ensure that the pressure in the storage tank device 30 is maintained at a pressure environment that meets the requirements for storing liquid carbon dioxide. Among them, the proportional control valve 81 is a device for regulating the flow of fluid, and its function is to adjust the opening of the valve according to the change of the input signal to control the flow of the fluid; illustratively, the pressure data inside the tank can be obtained by the pressure sensor equipped with the storage tank device 30 through the control module, and the pressure threshold of the pressure environment in the storage tank device 30 that meets the pressure environment for maintaining liquid carbon dioxide storage is combined to transmit the signal control to the proportional control valve 81, wherein the control module can be implemented by a microcontroller, etc.

[0070] It should be understood that the first liquid inlet end 31 , the second gas outlet end 32 , the fourth gas inlet end 33 , the third liquid outlet end 34 , and the fifth gas outlet end 35 included in 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, that is, during the process of storing the captured carbon dioxide in the storage tank device 30, the pressure relief line 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 in the storage tank device 30 is maintained at a pressure environment that meets the requirements for maintaining the storage of liquid carbon dioxide.

[0072] In some embodiments, the liquid phase circulation pipeline 60 in the present application includes a shielded pump 63, one end of the shielded pump 63 is configured to communicate with the second liquid inlet end 61, and the other end of the shielded pump 63 is configured to communicate with the second liquid outlet end 62; wherein the shielded pump 63 provides fluid pressure and flow to transfer liquid. When the liquefaction system completes the work, the storage tank device 30 can lead the liquid carbon dioxide stored in the storage tank device 30 back to the liquefaction device 20 through the shielded pump 63 via the liquid phase circulation pipeline 60. The shielded pump 63 can be controlled by the control module.

[0073] Correspondingly, the present application also provides a carbon dioxide liquid cargo system, including the carbon dioxide liquefaction system as described in the above embodiment.

[0074] The carbon dioxide liquefaction system is used to convert carbon dioxide gas into liquid carbon dioxide, so that the carbon dioxide gas reaches the liquefied condition, which is convenient for storage and transportation. The carbon dioxide liquid cargo system is a system for transporting and storing liquid carbon dioxide, which includes a liquefaction system, a storage container, a transmission pipeline, and related control and safety equipment. The liquefaction system in this application improves the pre-pressurization efficiency during the first operation and commissioning of the system through the pressure charging pipeline 50, improves the liquefaction efficiency and avoids the waste of carbon dioxide through the gas phase circulation pipeline 40, and extends the lossless storage time in the storage tank device 30 through the liquid phase circulation pipeline 60; thereby improving the convenience and stability of the storage and transportation of the carbon dioxide liquid cargo system.

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

[0076] A carbon dioxide capture system refers to a system for capturing and separating carbon dioxide gas from industrial emission sources or air. The liquefaction system in the present application improves the liquefaction efficiency and avoids the waste of carbon dioxide through the gas phase circulation pipeline 40, and prolongs the lossless storage time in the storage tank device 30 through the liquid phase circulation pipeline 60; thereby improving the convenience and stability of the storage and transportation of the carbon dioxide liquid cargo system, and further improving the capture efficiency and stability of the carbon dioxide capture system.

[0077] See also Figure 8 , Figure 8 A flow chart of a carbon dioxide capture method provided in an embodiment of the present application. Accordingly, the present application also provides a carbon dioxide capture method, using a carbon dioxide liquefaction system as in the above embodiment; the carbon dioxide capture method comprises the following steps:

[0078] receiving gaseous carbon dioxide through a compression device 10 and outputting compressed gaseous carbon dioxide;

[0079] receiving compressed gaseous carbon dioxide through a liquefaction device 20 and outputting liquid carbon dioxide;

[0080] The liquid carbon dioxide is received by the tank device 30 , and the gaseous carbon dioxide in the tank device 30 is output to the compression device 10 .

[0081] In the present application, the carbon dioxide liquefaction system includes a compression device 10, a liquefaction device 20, and a storage tank device 30. The storage tank device receives the liquid carbon dioxide output by the liquefaction device 20 through the first liquid inlet end 31, and outputs the gaseous carbon dioxide in the storage tank device 30 to the compression device 10. The compression device 10 recompresses the gaseous carbon dioxide output by the storage tank device 30, and then liquefies it through the liquefaction device 20 and inputs it into the storage tank device 30 for storage; the present application compresses and liquefies the gaseous carbon dioxide in the storage tank device 30 into liquid carbon dioxide again, thereby solving the problem that part of the liquid carbon dioxide in the storage tank will be gasified into gaseous carbon dioxide during the storage of liquid carbon dioxide, causing the loss of liquid carbon dioxide, thereby reducing the liquefaction efficiency of carbon dioxide and avoiding the loss of liquid carbon dioxide. In addition, the liquefaction efficiency is improved and the waste of carbon dioxide is avoided through the gas phase circulation pipeline 40, and the lossless storage time in the storage tank device 30 is extended through the liquid phase circulation pipeline 60; thereby improving the convenience and stability of the storage and transportation of the carbon dioxide liquid cargo system, and improving the capture efficiency and system stability of the carbon dioxide capture system.

[0082] The above is a detailed introduction to a carbon dioxide liquefaction system, a liquid cargo system and a capture system provided by the present application. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea; at the same time, for a person skilled in the art, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A carbon dioxide liquefaction system, characterized in that: include: A compression device (10), the compression device (10) comprising a first air inlet end (11) and a first air outlet end (12), the first air inlet end (11) being used to receive gaseous carbon dioxide, and the first air outlet end (12) being used to output compressed gaseous carbon dioxide; A liquefaction device (20), the liquefaction device (20) comprising a second air inlet end (21) and a first liquid outlet end (22), the second air inlet end (21) being used to receive the compressed gaseous carbon dioxide, and the first liquid outlet end (22) being used to output liquid carbon dioxide; A storage tank device (30), the storage tank device (30) comprising a first liquid inlet end (31) and a second gas outlet end (32), the first liquid inlet end (31) being connected to the first liquid outlet end (22), the second gas outlet end (32) being connected to the first gas inlet end (11), the first liquid inlet end (31) being used to receive the liquid carbon dioxide, and the second gas outlet end (32) being used to output the gaseous carbon dioxide in the storage tank device (30).

2. A carbon dioxide liquefaction system according to claim 1, characterized in that: Also includes: A gas phase circulation pipeline (40), wherein the second gas outlet (32) outputs the gaseous carbon dioxide in the storage tank device (30) to the first gas inlet (11) via the gas phase circulation pipeline (40).

3. A carbon dioxide liquefaction system according to claim 1, characterized in that: Also includes: A charging pipeline (50), the charging pipeline (50) comprising a third air inlet end (51) and a third air outlet end (52), the storage tank device (30) further comprising a fourth air inlet end (33), the third air inlet end (51) being in communication with the first air outlet end (12), and the third air outlet end (52) being in communication with the fourth air inlet end (33); The compressed gaseous carbon dioxide is input into the storage tank device (30) through the charging pipeline (50) to charge the storage tank device (30).

4. A carbon dioxide liquefaction system according to claim 1, characterized in that: Also includes: A liquid phase circulation pipeline (60), the liquid phase circulation pipeline comprising a second liquid inlet (61) and a second liquid outlet (62), the storage tank device (30) further comprising a third liquid outlet (34), the liquefaction device (20) further comprising a third liquid inlet (23), the second liquid inlet (61) being in communication with the third liquid outlet (34), and the second liquid outlet (62) being in communication with the third liquid inlet (23); The liquid phase circulation pipeline (60) is used to transport the liquid carbon dioxide in the storage tank device (30) into the liquefaction device (20), and to transport the liquid carbon dioxide into the storage tank device (30) through the first liquid inlet end (31).

5. A carbon dioxide liquefaction system according to claim 1, characterized in that: The compression device (10) comprises a compression device (13) and a voltage regulating device (14), wherein the compression device (13) comprises a first end (131) and a second end (132), and the voltage regulating device (14) comprises 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).

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

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

8. A carbon dioxide liquefaction system according to claim 7, characterized in that: The gas-liquid separation device (70) comprises a voltage stabilizing device (75), wherein the voltage stabilizing device (75) comprises an eighth end (751) and a ninth end (752), wherein the eighth end (751) is configured to communicate with the fifth air inlet end (71), and the ninth end (752) is configured to communicate with the fifth end (741).

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

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

11. A carbon dioxide liquid cargo system, characterized in that: Comprising the carbon dioxide liquefaction system as described in any one of claims 1-10.

12. A carbon dioxide capture system, characterized in that: Comprising the liquid cargo system as claimed in claim 11.

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