Carbon dioxide liquefaction system, liquid cargo system and trapping system

Abstract

The utility model 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] This 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 Art

[0002] The liquefaction system of carbon dioxide 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 vaporize into gaseous carbon dioxide, resulting in the loss of liquid carbon dioxide, and thus reducing the liquefaction efficiency of carbon dioxide. Summary of the Utility Model

[0003] In view of the above problems, this 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 vaporize into gaseous carbon dioxide, resulting in the loss of liquid carbon dioxide, and thus reducing the liquefaction efficiency of carbon dioxide.

[0004] This application provides a carbon dioxide liquefaction system. The carbon dioxide liquefaction system includes: a compression device, the compression device includes a first intake end and a first outlet end, the first intake end is used to receive gaseous carbon dioxide, and the first outlet end is used to output compressed gaseous carbon dioxide; a liquefaction device, the liquefaction device includes a second intake end and a first liquid outlet end, the second intake 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 includes a first liquid inlet end and a second outlet end, the first liquid inlet end is communicated with the first liquid outlet end, the second outlet end is communicated with the first intake end, the first liquid inlet end is used to receive liquid carbon dioxide, and the second 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 outlet end outputs the gaseous carbon dioxide in the storage tank device to the first intake end through the gas-phase circulation pipeline.

[0006] In some embodiments, the carbon dioxide liquefaction system further includes: a pressurization pipeline, the pressurization pipeline includes a third intake end and a third outlet end, the storage tank device further includes a fourth intake end, the third intake end is communicated with the first outlet end, and the third outlet end is communicated with the fourth intake 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 includes a second liquid inlet end and a second liquid outlet end, the storage tank device further includes a third liquid outlet end, and the liquefaction device further includes a third liquid inlet end. The second liquid inlet end is communicated with the third liquid outlet end, and the second liquid outlet end is communicated with 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 input it into the storage tank device through the first liquid inlet end.

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

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

[0010] In some embodiments, the carbon dioxide liquefaction system further 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 material gas, the fourth air outlet end is used to output the dehydrated gaseous carbon dioxide to the first air inlet end, and the fourth liquid outlet end is used to output the liquid water; wherein, the dehydrated gaseous carbon dioxide and the gaseous carbon dioxide in the storage tank device serve as the gas sources of the compressed gaseous carbon dioxide.

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

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

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

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

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

[0016] Correspondingly, the present application further provides a carbon dioxide capture system, including the liquid cargo system as described in the above embodiments.

[0017] The beneficial effects of the present application are as follows. The present 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 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 recompresses 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. By recompressing and liquefying the gaseous carbon dioxide in the storage tank device into liquid carbon dioxide, the present application solves the problem that during the storage of liquid carbon dioxide in the storage tank, part of the liquid carbon dioxide in the storage tank will vaporize into gaseous carbon dioxide, resulting in the loss of liquid carbon dioxide, and further reducing the liquefaction efficiency of carbon dioxide, and avoids 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 following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0019] Figure 1 Schematic diagram of a carbon dioxide liquefaction system provided by an embodiment of the present application;

[0020] Figure 2 Schematic diagram of an example structure of the liquefaction system provided by an embodiment of the present application;

[0021] Figure 3 Another schematic diagram of an example structure of the liquefaction system provided by an embodiment of the present application;

[0022] Figure 4 Another schematic diagram of an example structure of the liquefaction system provided by an embodiment of the present application;

[0023] Figure 5 Another schematic diagram of an example structure of the liquefaction system provided by an embodiment of the present application;

[0024] Figure 6 Another schematic diagram of an example structure of the liquefaction system provided by an embodiment of the present application;

[0025] Figure 7 Another schematic diagram of an example structure of the liquefaction system provided by an embodiment of the present application;

[0026] Figure 8 Schematic diagram of the process of a carbon dioxide capture method provided by an embodiment of the present application;

[0027] Description of the reference numerals:

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

[0029] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying 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 the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present application. In addition, it should be understood that the specific implementation manners 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 quantity of the indicated technical features. Thus, the features defined with "first", "second" may explicitly or implicitly include one or more of the described features.

[0030] The present application provides a carbon dioxide liquefaction system, a liquid cargo system and a capture system, which will be described in detail below. It should be noted that the description order of the following embodiments does not limit the preferred order of the embodiments of the present application. And in the following embodiments, each embodiment is described with its own emphasis. For the parts not detailed in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0031] With the increase in 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 carbon dioxide emissions have led to global warming, sea-level rise, and ecosystem instability. By capturing carbon dioxide, its concentration in the atmosphere can be reduced, which helps to control global warming and mitigate the impact of climate change. During the process of carbon dioxide capture, liquefying carbon dioxide can achieve advantages such as convenient storage and transportation, improved safety, reduced volume, facilitation of specific utilization methods, and increased energy density.

[0032] During the liquefaction process by a 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 gasify into gaseous carbon dioxide more, combined with the pressurized gaseous carbon dioxide originally present in the storage tank, which causes the pressure in the storage tank to increase. It is necessary to discharge the gaseous carbon dioxide in the storage tank to keep the pressure in the storage tank within a safe range. However, the release and discharge of gaseous carbon dioxide result in the waste of carbon dioxide during the liquefaction process, reducing the liquefaction efficiency of carbon dioxide, and the release and discharge of gaseous carbon dioxide into the atmosphere also cause certain pollution to the environment.

[0033] The carbon dioxide liquefaction system can be applied to industries such as aviation, waste treatment, iron and steel smelting, cement production, climate control, etc. By applying the carbon dioxide liquefaction system during the process of capturing carbon dioxide in these fields, the emissions of carbon dioxide and negative environmental impacts can be effectively reduced, promoting the low-carbon economy and sustainable development.

[0034] For the convenience of understanding this application, in this application, taking the application of the carbon dioxide liquefaction system in the shipping industry as an example, the carbon dioxide liquefaction system of this application will be introduced in detail.

[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 recompresses 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; this application improves the structure of the carbon dioxide liquefaction system to recompress and liquefy the gaseous carbon dioxide in the storage tank device into liquid carbon dioxide, avoiding the loss of liquid carbon dioxide and improving the liquefaction efficiency.

[0036] Please refer to Figure 1 , Figure 1Schematic diagram of a carbon dioxide liquefaction system provided by 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 intake end 11 and a first outlet end 12, the first intake 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, the liquefaction device 20 includes a second intake end 21 and a first liquid outlet end 22, the second intake 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 gas outlet end 32, the first liquid inlet end 31 is communicated with the first liquid outlet end 22, the second gas outlet end 32 is communicated with the first intake end 11, the first liquid inlet end 31 is used to receive liquid carbon dioxide, and the second gas 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, when storing the carbon dioxide to be captured into the storage tank device 30, gaseous carbon dioxide is input into the first intake end 11 of the compression device 10. The compression device 10 compresses the gaseous carbon dioxide and then discharges it from the first outlet end 12 to the second intake end 21 of the liquefaction device 20 to enter the liquefaction device 20. Among them, the compression of the gaseous carbon dioxide by the compression device 10 is to pressurize 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. The gaseous carbon dioxide input into the first intake end 11 of the compression device 10 can be the gaseous carbon dioxide in the storage tank device 30, or can include the captured gaseous carbon dioxide and the 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 end 22 to the first liquid intake end 31 of the storage tank device 30 to enter the storage tank device 30 for storage. Among them, 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 reduce the temperature to the liquefaction temperature corresponding to the pressure of the compressed gaseous carbon dioxide, that is, to reach the phase change point where carbon dioxide changes from gaseous to liquid, thereby liquefying the compressed gaseous carbon dioxide into liquid carbon dioxide. In addition, during the process that 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 intake end 31 of the storage tank device 30 to enter the storage tank device 30 for storage, at the same time, the storage tank device 30 also discharges gaseous carbon dioxide with the same volume as the entering liquid carbon dioxide. Then, the storage tank device 30 conveys the discharged gaseous carbon dioxide through the second outlet end 32 to the compression device 10 through the first intake end 11 for recompression, and then stores it in the storage tank device 30 through the liquefaction device 20; the gaseous carbon dioxide in the storage tank device 30 includes the gaseous carbon dioxide stored in the tank before injecting liquid carbon dioxide into the storage tank device 30, that is, the gaseous carbon dioxide used to pressurize the storage tank device 30, combined with the fact that a small amount of gaseous carbon dioxide will be flash-evaporated due to the change in the storage space volume of the liquid carbon dioxide stored in the storage tank device 30.

[0038] Exemplarily, taking the gaseous carbon dioxide input at the first intake end 11 of the compression device 10, which includes captured gaseous carbon dioxide and gaseous carbon dioxide in the storage tank device 30, as an example, in the present application, the pressure range of the gaseous carbon dioxide input into the compression device 10 at the first intake end 11 is 0 kPa to 4 kPa, and the temperature range is 30°C to 40°C. That is, the pressure of the gaseous carbon dioxide input into the compression device 10 can be any pressure among 0 kPa, 1 kPa, 2 kPa, 3 kPa or the range value between any two pressures, and the temperature of the gaseous carbon dioxide input into the compression device 10 can be any temperature among 30°C, 31°C, 32°C, 33°C, 34°C, 35°C, 36°C, 37°C, 38°C, 39°C, 40°C or the range value between any two temperatures; the pressure range for the compression device 10 to pressurize the input gaseous carbon dioxide is 15 bar to 20 bar, that is, the pressure range of the gaseous carbon dioxide at the first outlet end 12 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 liquid outlet end 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 outlet end 12 can be any pressure among 15 bar, 16 bar, 17 bar, 18 bar, 19 bar, 20 bar or the range value between any two pressures, and the temperature of the liquid carbon dioxide at the first liquid outlet end 22 can be any temperature among -32°C, -33°C, -34°C, -35°C or the range value between any two temperatures; considering the overall performance of the overall system design, when the compression device 10 pressurizes the input gaseous carbon dioxide to a pressure range of 15 bar to 20 bar, the corresponding phase change point temperature for carbon dioxide to change from gaseous 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 carbon dioxide in a liquid state. The existence of subcooling can provide a certain safety margin to ensure 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. In addition, all pressures in the present application are absolute pressures. In some embodiments, the pressure of the liquid carbon dioxide at the first liquid outlet end 22 is greater than the pressure of the liquid carbon dioxide at the first liquid inlet end 31. Furthermore, based on the pressure difference between the liquid carbon dioxide at the first liquid outlet end 22 and the first liquid inlet end 31, following the principle that the fluid flows from the position with higher pressure to the position with lower pressure, the liquid carbon dioxide enters the storage tank device 30 through the first liquid inlet end 31 from the first liquid outlet end 22 for storage.Based on the pressure difference, liquid carbon dioxide enters the storage tank device 30 from the first liquid outlet end 22 through the first liquid inlet end 31 for storage, making the structure of the liquefaction system simpler and avoiding the corresponding 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 in the storage tank device 30, facilitating 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. Thus, on the one hand, the pressure difference conditions are met 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 other hand, the pressure environment for storing liquid carbon dioxide is satisfied inside the storage tank device.

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

[0041] Exemplarily, since the gaseous carbon dioxide in the storage tank device 30 is located above the stored liquid carbon dioxide, further, the second gas outlet end 32 of the storage tank device 30 can be arranged at the upper top when the storage tank device 30 is placed, or can be arranged 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 end 32 is the pressure in the storage tank device 30. Since the first gas inlet end 11 is respectively connected to the second gas outlet end 32 and the pipeline for capturing carbon dioxide, and the pressure of the gaseous carbon dioxide in the pipeline for capturing carbon dioxide is less than the pressure in the storage tank device 30, the pressure of the gaseous carbon dioxide at the second gas outlet end 32 is greater than the pressure of the gaseous carbon dioxide at the first gas inlet end 11 based on the gas flow into the compression device 10 at the first gas inlet end 11.

[0042] In view of this, during the process in which the liquefaction device 20 converts compressed gaseous carbon dioxide into liquid carbon dioxide and then discharges it from the first liquid outlet end 22 to enter the first liquid inlet end 31 of the storage tank device 30 and is stored in the storage tank device 30, the pressure in the storage tank device 30 is less than the pressure pressurized by the compression device 10, and the pressure of the gaseous carbon dioxide input at the first gas inlet end 11 of the compression device 10 is less than the pressure in the storage tank device 30. Furthermore, under the action of the pressure difference, the liquid carbon dioxide enters the storage tank device 30 from the first liquid outlet end 22 through the first liquid inlet end 31 for storage, and the gaseous carbon dioxide enters the compression device 10 from the second gas outlet end 32 of the storage tank device 30 through the first gas inlet end 11 for re-compression; to re-compress and liquefy the gaseous carbon dioxide in the storage tank device into liquid carbon dioxide, avoid the loss of liquid carbon dioxide, and improve the liquefaction efficiency.

[0043] In addition, for the first liquid inlet end 31 of the storage tank device 30 to receive the liquid carbon dioxide output by the liquefaction device 20, a device providing fluid power such as a pump can be used to transport the liquid carbon dioxide output by the liquefaction device 20 from the first liquid inlet end 31 to the storage tank device 30; similarly, for the first gas inlet end 11 of the compression device 10 to receive the gaseous carbon dioxide output by the second gas outlet end 32 of the storage tank device 30, a device providing fluid power such as a compressor or a fan can be used to transport the gaseous carbon dioxide in the storage tank device 30 from the second gas outlet end 32 and the first gas inlet end 11 to the compression device 10. Furthermore, even when the pressure difference condition is not satisfied between the storage tank device 30 and the compression device 10, and between the storage tank device 30 and the liquefaction device 20, the liquid carbon dioxide can still be discharged from the first liquid outlet end 22 to enter the first liquid inlet end 31 of the storage tank device 30 for storage, and the gaseous carbon dioxide can enter the compression device 10 from the second gas outlet end 32 of the storage tank device 30 through the first gas inlet end 11 for re-compression.

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

[0045] It should be understood that the first gas outlet end 12 of the compression device 10 is communicated with the second gas inlet end 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 end 22 of the liquefaction device 20 is communicated with the first liquid inlet end 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 since the medium of this 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, and the material can be low-temperature steel, and it can be equipped with a pressure sensor, a liquid level sensor, a temperature sensor, etc. to detect the pressure, temperature, liquid level, etc. in the tank to ensure the safety of the system, and there is gaseous carbon dioxide in the storage tank before the storage tank device 30 stores liquid carbon dioxide for the storage of liquid carbon dioxide. In the present application, the liquid carbon dioxide storage tank device 30 is used to store the 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 adopt a stainless steel pipe, and the material can adopt 304 stainless steel; and each pipeline can include fluid control devices such as valves, and the valves 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 solution, 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; in the present application, by recompressing and liquefying the gaseous carbon dioxide in the storage tank device 30 into liquid carbon dioxide, the problem that during the storage of liquid carbon dioxide in the storage tank, part of the liquid carbon dioxide in the storage tank will vaporize into gaseous carbon dioxide, resulting in the loss of liquid carbon dioxide and further reducing the liquefaction efficiency of carbon dioxide is solved, and the loss of liquid carbon dioxide is avoided. Moreover, in the present application, the pipeline connecting the storage tank device 30 and the first gas inlet end 11 of the compression device 10 is used for the reprocessing of the gaseous carbon dioxide in the storage tank device 30, avoiding the waste caused by the direct discharge of the gaseous carbon dioxide in the storage tank device 30 into the atmosphere.

[0048] Please refer to Figure 2 , Figure 2It is a schematic structural diagram of an example of the liquefaction system provided by the embodiments of the present application. In some embodiments, the compression device 10 includes a compression component 13 and a pressure regulator component 14. The compression component 13 includes a first end 131 and a second end 132. The pressure regulator component 14 includes a third end 141 and a fourth end 142. The first end 131 is configured to communicate with the first intake end 11, the second end 132 communicates with the third end 141, and the fourth end 142 is configured to communicate with the first outlet end 12.

[0049] In some embodiments, the liquefaction device 20 can employ 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 solution, the compression component 13 is used to pressurize the received gaseous carbon dioxide to a relatively high pressure, so that the gaseous carbon dioxide reaches the pressure corresponding to the liquefaction temperature set in the liquefaction device; the pressure regulator component 14 is used to buffer the gaseous carbon dioxide pressurized by the compression component 13, so that the gaseous carbon dioxide enters the subsequent system more smoothly. Among them, the pressure regulator component 14 can be a pressure vessel, made of 316 stainless steel, and equipped with a safety valve to ensure system safety; the compression component 13 can employ a compressor; in addition, the second end 132 of the compression component 13 and the third end 141 of the pressure regulator component 14 can be connected by a pipeline, and the fourth end 142 of the pressure regulator component 14 and the second intake end 21 of the liquefaction device 20 can be connected by a pipeline, and the pipeline can use a stainless steel pipe. In this application, the gaseous carbon dioxide is pressurized by the compression component 13 so that the gaseous carbon dioxide meets the pressure during liquefaction. In addition, the pressure regulator component 14 plays a role in balancing and regulating the gas pressure in the system, so that the output compressed gaseous carbon dioxide maintains a stable pressure and enters the liquefaction device 20 smoothly. The refrigeration device cools the pressurized gaseous carbon dioxide to the liquefaction temperature at the current pressure, and then obtains liquid carbon dioxide for storage in the storage tank device 30.

[0051] Please refer to Figure 3 , Figure 3 It is another schematic structural diagram of the liquefaction system provided by the embodiments of the present application. In some embodiments, the carbon dioxide liquefaction system further includes: a pressurization pipeline 50. The pressurization pipeline 50 includes a third intake end 51 and a third outlet end 52. The storage tank device 30 further includes a fourth intake end 33. The third intake end 51 communicates with the first outlet end 12, and the third outlet end 52 communicates with the fourth intake end 33; the 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 first put into operation, it is necessary to pre-pressurize the storage tank device 30. First, the protective gas in the tank at the time of factory shipment is replaced and discharged. Second, an environmental pressure suitable for storing liquid carbon dioxide is created. Furthermore, in order to improve the pre-pressurization efficiency of the storage tank device 30 during the first operation and commissioning of the liquefaction system, a pressurization pipeline 50 is adopted in this application, that is, the pressurization pipeline 50 is connected to the storage tank device 30 and also 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 pressurization pipeline 50 to pressurize the storage tank device 30; specifically, the protective gas in the tank can be replaced and discharged by the method of upward exhaust, and at the same time, the pre-pressurization of the storage tank device 30 is achieved.

[0053] That is to say, before the storage tank device 30 in the liquefaction system stores liquid carbon dioxide, it 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 re-compression and liquefaction treatment of the gaseous carbon dioxide in the storage tank device 30 during the process of storing liquid carbon dioxide, it is necessary to replace and discharge the protective gas in the tank at the time of factory shipment to avoid the problem of the purity of the collected carbon dioxide; during the pressurization process of the storage tank device 30, the fluid in the gas phase circulation pipeline 40 does not flow, that is, the gas in the storage tank device 30 and the first intake end 11 of the compression device 10 do not flow through the gas phase circulation pipeline 40, and the fluid flow in the gas phase circulation pipeline 40 can be blocked by a fluid control device such as a valve on the pipeline; and the liquefaction device 20 is closed, so that the gaseous carbon dioxide does not flow between the second intake 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 pressurization pipeline 50; at this time, the storage tank device 30 receives the pressurized gaseous carbon dioxide through the fourth intake end 33 and discharges the original protective gas in the storage tank device 30.

[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 pressurizing pipeline 50 directly connecting the gaseous carbon dioxide after being pressurized by the compression device 10 to 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 during the first operation of the system, so as to discharge the protective gas in the tank when leaving the factory, prevent the collected carbon dioxide from being contaminated with other components and causing purity problems; and create an appropriate environmental pressure for storing liquid carbon dioxide; in addition, the pre-pressurization efficiency during the first operation and commissioning of the storage tank device 30 in the system is improved, thereby improving the carbon dioxide capture and storage efficiency.

[0057] Please refer to Figure 4 , Figure 4 which is another schematic structural diagram of the liquefaction system provided by the 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 and a second liquid outlet end 62, the storage tank device 30 further includes a third liquid outlet end 34, the liquefaction device 20 further includes a third liquid inlet end 23, the second liquid inlet end 61 is communicated with the third liquid outlet end 34, and the second liquid outlet end 62 is communicated with the third liquid inlet end 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 input it into the storage tank device 30 through the first liquid inlet end 31.

[0058] When the liquefaction system finishes working, that is, when the liquid carbon dioxide stored in the storage tank device 30 reaches the preset liquid level to complete the storage of liquid carbon dioxide or the liquefaction system stops working, at this time the liquefaction system is in a shutdown state. Since the storage tank device 30 continuously exchanges heat with the external environment, the temperature inside the tank continuously rises, causing the liquid carbon dioxide inside the tank to continuously generate BOG, that is, the process of liquid carbon dioxide gasifying to generate gaseous carbon dioxide is called BOG, and the pressure inside the tank will also rise synchronously until the safety valve of the storage tank device 30 jumps to discharge gaseous carbon dioxide to reduce the pressure inside the tank, but this will cause a decrease in the actual carbon dioxide liquefaction efficiency, thereby affecting the capture efficiency of the marine carbon dioxide capture system. Furthermore, in order to improve the long-term storage capacity of the storage tank device 30, the liquefaction device of the present application uses the liquid phase circulation pipeline 60 to connect the storage tank device 30 and the liquefaction device 20, and leads a small amount of liquid carbon dioxide stored in the storage tank device 30 back to the liquefaction device 20 for cryogenic treatment, and the treated low-temperature liquid carbon dioxide flows back to the top of the storage tank device 30 for spray cooling.

[0059] Exemplarily, the third liquid outlet end 34 of the storage tank device 30 can be set at the position of the bottom liquid collection well 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 from the storage tank device 30 to the liquefaction device 20 can be specifically set according to the design volume, liquid storage capacity and design process of the storage tank, and the present application does not limit this.

[0060] Based on the above solution, the present application designs a liquid-phase circulation pipeline 60. The liquid-phase circulation pipeline 60 is used to connect the storage tank device 30 with the liquefaction device 20, and lead the preset amount of liquid carbon dioxide stored in the storage tank device 30 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 generation rate of BOG in the tank, thereby achieving the effect of extending the lossless storage time of the storage tank device 30.

[0061] Please refer to Figure 5 , Figure 5 which is another schematic structural diagram of the liquefaction system provided by the 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 intake end 71, a fourth outlet end 72, and a fourth liquid outlet end 73. The fifth intake end 71 is used to receive carbon dioxide raw gas, the fourth outlet end 72 is used to output dehydrated gaseous carbon dioxide to the first intake 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 sources of the compressed gaseous carbon dioxide.

[0062] Among them, 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 the chemical absorption method. The fourth outlet end 72 is connected to the first intake end 11 through a pipeline, and the fourth outlet end 72 is used to output dehydrated gaseous carbon dioxide to the first intake end 11, that is, the fourth outlet end 72 outputs the captured gaseous carbon dioxide to the first intake end 11.

[0063] Based on the above solution, for the method of obtaining gaseous carbon dioxide by the chemical absorption method, a certain amount of water vapor usually generates in the gaseous carbon dioxide. In order to ensure the purity and quality of carbon dioxide, it is then 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, reduces the possibility of corrosion, and extends the service life of the equipment.

[0064] Please refer to Figure 6 , Figure 6Another schematic structural diagram of the liquefaction system provided by the 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 intake end 71. The sixth end 742 is configured to communicate with the fourth outlet end 72. 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. The voltage regulator 75 includes an eighth end 751 and a ninth end 752. The eighth end 751 is configured to communicate with the fifth intake end 71. The ninth end 752 is configured to communicate with the fifth end 741.

[0066] Exemplarily, the voltage regulator 75 can be a pressure stabilizing tank made of 316 stainless steel. The gaseous carbon dioxide with supersaturated water vapor, that is, the carbon dioxide raw material gas, enters the pressure stabilizing tank through a stainless steel pipe, which is used to adjust 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. The dryer 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 it carries becomes liquid water and is discharged, realizing the gas-liquid separation function and avoiding a large amount of water vapor from entering the compression device 10. Among them, the dew point temperature range for the dryer to cool down is from -50°C to -70°C.

[0068] Based on the above solution, the present application designs the voltage regulator 75 and the drying device 74. The gaseous carbon dioxide with supersaturated water vapor, that is, the carbon dioxide raw material gas, can enter the liquid cargo system through a stainless steel pipe. That is, it first enters the voltage regulator 75 and is buffered by the voltage regulator 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 becomes liquid water and is discharged, realizing gas-liquid separation and the purpose of dehydrating and drying the gas. It ensures the purity and quality of carbon dioxide, reduces the possibility of equipment corrosion caused by water vapor, and extends the service life of the equipment.

[0069] Please refer to Figure 7 , Figure 7 Another schematic structural diagram of the liquefaction system provided by the embodiment of the present application. Figure 7Some structures of the liquefaction system were introduced separately in the above embodiments and will not be repeated here. In some embodiments, the liquefaction system of 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 end 35. One end of the pressure relief pipeline 80 is communicated with the fifth gas outlet end 35, and 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 end 35 may be provided at the upper top of the storage tank device 30 when it is placed, or may be provided at a position above the maximum liquid storage level of the storage tank device 30. Before the storage tank device 30 stores liquid carbon dioxide in the liquefaction system, 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 to adjust the pressure in the storage tank and ensure that the pressure environment for storing liquid carbon dioxide is satisfied, that is, the pressure of the liquid carbon dioxide at the first liquid outlet end 22 is greater than the pressure of the liquid carbon dioxide at the first liquid inlet end 31, and the pressure of the gaseous carbon dioxide at the second gas outlet end 32 is greater than the pressure of the gaseous carbon dioxide at the first gas inlet end 11. Specifically, the pressure data in the tank can be obtained based on the pressure sensor equipped in 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 in a pressure environment that satisfies the storage of liquid carbon dioxide. Among them, the proportional control valve 81 is a device for regulating the fluid flow rate. Its function is to adjust the opening of the valve according to the change of the input signal to control the fluid flow rate. Exemplarily, the pressure data in the tank can be obtained by the control module through the pressure sensor equipped in the storage tank device 30, combined with the pressure threshold for maintaining the pressure environment for storing liquid carbon dioxide in the storage tank device 30, and a signal is transmitted to control the proportional control valve 81, where the control module can be implemented by a microcontroller or the like.

[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 at different positions on the storage tank device.

[0071] In some embodiments, during the operation of the liquefaction system, when the carbon dioxide to be captured 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 pressure in the storage tank device 30 is maintained in a pressure environment that satisfies the storage of liquid carbon dioxide.

[0072] In some embodiments, the liquid-phase circulation pipeline 60 in the present application includes a canned motor pump 63. One end of the canned motor pump 63 is configured to communicate with the second liquid inlet end 61, and the other end of the canned motor pump 63 is configured to communicate with the second liquid outlet end 62. The canned motor pump 63 provides fluid pressure and flow rate to transfer the liquid. After the liquefaction system finishes working, the storage tank device 30 can draw the liquid carbon dioxide stored in the storage tank device 30 back to the liquefaction device 20 through the canned motor pump 63 via the liquid-phase circulation pipeline 60. The canned motor pump 63 can be controlled by the control module.

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

[0074] The carbon dioxide liquefaction system is used to convert carbon dioxide gas into liquid carbon dioxide, enabling the carbon dioxide gas to meet the liquefaction conditions, thus facilitating 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 conveying pipeline, and related control and safety equipment, etc. The liquefaction system in the present application improves the pre-charging efficiency during the first commissioning of the system through the pressurization 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. Thus, the convenience and stability of storing and transporting the carbon dioxide liquid cargo system are improved.

[0075] Correspondingly, the present application further provides a carbon dioxide capture system, including the liquid cargo system as described in the above embodiments.

[0076] The carbon dioxide capture system refers to a system used to capture and separate carbon dioxide gas from industrial emission sources or the 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 extends the lossless storage time in the storage tank device 30 through the liquid-phase circulation pipeline 60. Thus, the convenience and stability of storing and transporting the carbon dioxide liquid cargo system are improved, and further the capture efficiency of the carbon dioxide capture system and the stability of the system are improved.

[0077] Please refer to Figure 8 , Figure 8 which is a schematic flow chart of a carbon dioxide capture method provided by an embodiment of the present application. Correspondingly, the present application further provides a carbon dioxide capture method, using the carbon dioxide liquefaction system as described in the above embodiments. The carbon dioxide capture method includes the following steps:

[0078] Receiving gaseous carbon dioxide through the compression device 10 and outputting the compressed gaseous carbon dioxide;

[0079] Receiving the compressed gaseous carbon dioxide through the liquefaction device 20 and outputting liquid carbon dioxide;

[0080] Receive liquid carbon dioxide through the storage tank device 30 and output the gaseous carbon dioxide in the storage tank device 30 to the compression device 10.

[0081] In this 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. In this application, by recompressing and liquefying the gaseous carbon dioxide in the storage tank device 30 into liquid carbon dioxide, the problem that during the storage of liquid carbon dioxide in the storage tank, part of the liquid carbon dioxide in the storage tank will vaporize into gaseous carbon dioxide, resulting in the loss of liquid carbon dioxide and thus reducing the liquefaction efficiency of carbon dioxide, is solved, and the loss of liquid carbon dioxide is avoided. 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. Furthermore, the convenience and stability of the storage and transportation of the carbon dioxide liquid cargo system are improved, and the capture efficiency and system stability of the carbon dioxide capture system are improved.

[0082] The above provides a detailed introduction to a carbon dioxide liquefaction system, a liquid cargo system, and a capture system provided in this application. Specific examples are used in this article to elaborate on the principle and implementation manner of this application. The description of the above embodiments is only used to help understand the method and its core idea of this application. At the same time, for those of ordinary skill in the art, according to the idea of this application, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to this application.

Claims

1. A carbon dioxide liquefaction system, characterized in that, Comprising: A compression device (10), the compression device (10) includes a first intake end (11) and a first outlet end (12), the first intake 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), the liquefaction device (20) includes a second intake end (21) and a first liquid outlet end (22), the second intake end (21) is used to receive the 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 outlet end (32), the first liquid inlet end (31) is communicated with the first liquid outlet end (22), the second outlet end (32) is communicated with the first intake end (11), the first liquid inlet end (31) is used to receive the liquid carbon dioxide, and the second outlet end (32) is used to output the gaseous carbon dioxide in the storage tank device (30).

2. The carbon dioxide liquefaction system according to claim 1, wherein Further comprising: A gas-phase circulation pipeline (40), the second outlet end (32) outputs the gaseous carbon dioxide in the storage tank device (30) to the first intake end (11) through the gas-phase circulation pipeline (40).

3. The carbon dioxide liquefaction system according to claim 1, wherein Further comprising: A pressurization pipeline (50), the pressurization pipeline (50) includes a third intake end (51) and a third outlet end (52), the storage tank device (30) further includes a fourth intake end (33), the third intake end (51) is communicated with the first outlet end (12), and the third outlet end (52) is communicated with the fourth intake end (33); The compressed gaseous carbon dioxide is input into the storage tank device (30) through the pressurization pipeline (50) to pressurize the storage tank device (30).

4. The carbon dioxide liquefaction system according to claim 1, wherein Further comprising: A liquid-phase circulation pipeline (60), the liquid-phase circulation pipeline includes a second liquid inlet end (61) and a second liquid outlet end (62), the storage tank device (30) further includes a third liquid outlet end (34), the liquefaction device (20) further includes a third liquid inlet end (23), the second liquid inlet end (61) is communicated with the third liquid outlet end (34), and the second liquid outlet end (62) is communicated with the third liquid inlet end (23); The liquid-phase circulation pipeline (60) is used to input 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).

5. The carbon dioxide liquefaction system according to claim 1, wherein The compression device (10) includes a compression component (13) and a pressure regulator component (14), the compression component (13) includes a first end (131) and a second end (132), the pressure regulator component (14) includes a third end (141) and a fourth end (142), The first end (131) is configured to be communicated with the first intake end (11), the second end (132) is communicated with the third end (141), and the fourth end (142) is configured to be communicated with the first outlet end (12).

6. The carbon dioxide liquefaction system according to claim 1, characterized in that, Further comprising: A gas-liquid separation device (70), the gas-liquid separation device (70) comprising a fifth inlet end (71), a fourth outlet end (72), and a fourth liquid outlet end (73), the fifth inlet end (71) being configured to receive a carbon dioxide feed gas, the fourth outlet end (72) being configured to output dehydrated gaseous carbon dioxide to the first inlet end (11), and the fourth liquid outlet end (73) being configured 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 sources for the compressed gaseous carbon dioxide.

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

8. The carbon dioxide liquefaction system according to claim 7, wherein The gas-liquid separation device (70) comprises a voltage regulator device (75), the voltage regulator device (75) comprising an eighth end (751) and a ninth end (752), the eighth end (751) being configured to communicate with the fifth inlet end (71), and the ninth end (752) being configured to communicate with the fifth end (741).

9. The carbon dioxide liquefaction system according to claim 1, wherein The pressure of the gaseous carbon dioxide at the second outlet end (32) is greater than the pressure of the gaseous carbon dioxide at the first inlet end (11).

10. The carbon dioxide liquefaction system according to claim 1, wherein The pressure of the liquid carbon dioxide at the first liquid outlet end (22) is greater than the pressure of the liquid carbon dioxide at the first liquid inlet end (31).

11. A carbon dioxide liquid cargo system, characterized in that It comprises the carbon dioxide liquefaction system according to any one of claims 1-10.

12. A carbon dioxide capture system, characterized in that It comprises the liquid cargo system according to claim 11.

Images