Carbon dioxide recovery system

Abstract

To provide a carbon dioxide recovery system that highly efficiently enables separation, recovery and liquefaction storage of carbon dioxide by using a simple and compact configuration.SOLUTION: A carbon dioxide recovery system includes: a separation recovery device 2 for selectively separating and recovering carbon dioxide from material gas containing carbon dioxide; and a liquefaction storage device 3 that liquefies and stores in a container 36 the carbon dioxide separated and recovered by the separation recovery device 2. The liquefaction storage device 3 includes a Stirling refrigerator 24 that cools and liquefies the carbon dioxide separated and recovered by the separation recovery device 2. Due to this configuration, without using an expensive multistage compression type high pressure compressor that compresses carbon dioxide to high pressure and complicated and expensive multistage and multisource-type refrigerators for cooling to a low temperature, etc., carbon dioxide is efficiently separated and recovered from material gas and the separated and recovered carbon dioxide can be highly efficiently liquefied and stored by using a simple device configuration using the Stirling cycle enabling sophisticated low temperature cooling.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a carbon dioxide capture system that separates and captures carbon dioxide from exhaust gases containing carbon dioxide, and more particularly to a carbon dioxide capture system equipped with a liquefaction storage device that liquefies and stores the separated and captured carbon dioxide. [Background technology]

[0002] In order to address the issue of climate change, it is necessary to reduce emissions of carbon dioxide, a greenhouse gas. As a technology for reducing carbon dioxide emissions, active research and development has been conducted on technologies for separating and capturing carbon dioxide from raw gases containing carbon dioxide, such as combustion exhaust gas. Specifically, methods for separating and capturing carbon dioxide from other gases include chemical absorption, physical absorption, membrane separation, cryogenic separation, physical adsorption, oxyfuel combustion, and chemical looping combustion.

[0003] For example, Patent Document 1 discloses a CO2 recovery device that is configured to capture or adsorb carbon dioxide in a gas using a physical adsorption method, physical absorption method, chemical absorption method, cryogenic separation method, etc., to recover and store the carbon dioxide, and then recover the stored carbon dioxide in an external recovery vessel.

[0004] Furthermore, for example, Patent Document 2 discloses, as a technology relating to membrane separation, a carbon dioxide separation membrane that is selectively highly permeable to carbon dioxide and separates carbon dioxide from other gases with high selectivity. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent Publication No. 2021-110304 [Patent Document 2] International Publication No. 2013 / 24594 Summary of the Invention [Problem to be solved by the invention]

[0006] However, the carbon dioxide capture systems of the prior art still need to be improved in order to efficiently capture and store the separated carbon dioxide.

[0007] Specifically, in conventional carbon dioxide capture systems, the method of storing the separated and captured carbon dioxide in a gaseous state in a container such as a tank requires a very high-pressure or large container, and is therefore not practical.

[0008] Therefore, it is conceivable to liquefy the separated and recovered carbon dioxide and store it in a small tank, etc. In order to liquefy the separated and recovered carbon dioxide, a device is required that pressurizes the separated and recovered carbon dioxide gas to a pressure at which a phase change can occur or cools it to a temperature at which a phase change can occur.

[0009] Specifically, when liquefying carbon dioxide at room temperature, for example, a compressor is required that can pressurize the carbon dioxide to a high pressure of about 7 MPa. Furthermore, when liquefying carbon dioxide at the lowest possible pressure, for example, a refrigerator or the like that can cool the carbon dioxide to a low temperature of -50°C or below is required. A compressor capable of compressing carbon dioxide to such a high pressure range requires an expensive multistage high-pressure compressor or the like. Furthermore, in order to cool carbon dioxide to such a low temperature range, a refrigerator that uses a vapor compression refrigeration cycle requires a refrigerator with a complex and expensive multistage or multi-unit refrigerant circuit, making it difficult to put into practical use.

[0010] The present invention has been made in consideration of the above circumstances, and its object is to provide a carbon dioxide capture system that can achieve highly efficient separation, capture, and liquefied storage of carbon dioxide with a simple and compact configuration. [Means for solving the problem]

[0011] The carbon dioxide recovery system of the present invention includes a liquefaction storage device that liquefies carbon dioxide from a raw material gas containing carbon dioxide and stores the carbon dioxide in a container, and the liquefaction storage device is detachably connected to a high-pressure tank that stores the raw material gas pressurized by a compressor, and cools the raw material gas supplied from the high-pressure tank with a Stirling refrigerator to liquefy and store the carbon dioxide.

[0012] The carbon dioxide capture system of the present invention also comprises a separation and capture device that selectively separates and captures carbon dioxide from a raw material gas containing carbon dioxide, and a liquefaction and storage device that is detachably connected to the separation and capture device and liquefies the carbon dioxide separated and captured by the separation and capture device and stores it in a container, and is characterized in that the liquefaction and storage device has a Stirling refrigerator that cools and liquefies the carbon dioxide separated and captured by the separation and capture device. [Effects of the Invention]

[0013] The carbon dioxide capture system of the present invention includes a liquefaction storage device that liquefies carbon dioxide from a carbon dioxide-containing feed gas and stores it in a container. The liquefaction storage device is detachably connected to a high-pressure tank that stores the feed gas pressurized by a compressor. The liquefaction storage device cools the feed gas supplied from the high-pressure tank using a Stirling refrigerator to liquefy and store the carbon dioxide. This configuration allows for efficient cooling and liquefaction of carbon dioxide-containing gas using a Stirling cycle, which is capable of high-performance low-temperature cooling. In other words, highly efficient liquefaction and storage of separated and captured carbon dioxide can be achieved with a simple device configuration without using an expensive multistage high-pressure compressor that compresses carbon dioxide to high pressure or a complex and expensive multistage or multi-cascade refrigerator that cools it to low temperatures. Furthermore, the carbon dioxide-containing feed gas is pressurized by a compressor and stored in the high-pressure tank, and the carbon dioxide is then liquefied and stored in a liquefaction storage device that is detachably connected to the high-pressure tank. This allows for space-saving and highly efficient liquefaction and storage of carbon dioxide.

[0014] The carbon dioxide capture system of the present invention includes a separation / capture device that selectively separates and captures carbon dioxide from a carbon dioxide-containing feed gas, and a liquefaction / storage device that is detachably connected to the separation / capture device and liquefies the carbon dioxide separated and captured by the separation / capture device and stores it in a container. The liquefaction / storage device has a Stirling refrigerator that cools and liquefies the carbon dioxide separated and captured by the separation / capture device. This configuration allows for efficient cooling and liquefaction of the carbon dioxide gas separated and captured by the separation / capture device using a Stirling cycle, which is capable of high-performance low-temperature cooling. That is, highly efficient liquefaction and storage of separated and captured carbon dioxide can be achieved with a simple device configuration without using an expensive multistage high-pressure compressor that compresses carbon dioxide to high pressure or a complex and expensive multistage or multi-cascade refrigerator that cools it to low temperatures. In particular, this system allows for a novel capture scheme of distributed collection and centralized liquefaction / capture of carbon dioxide from small- to medium-sized carbon dioxide emission sources, such as small and medium-sized fossil-fuel-powered boilers, combustors, various engine-type generators, various vehicles, and cogeneration systems. Furthermore, because the separation and capture device and the liquefaction and storage device are detachably connected, they can be separated and used independently. Therefore, even in small places where installation space is limited, a compact device configuration in which the separation and capture device and the liquefaction and storage device are separated can achieve highly efficient capture and liquefaction storage of carbon dioxide.

[0015] Furthermore, in the carbon dioxide capture system of the present invention, the separation and capture device may include a selective separator that selectively separates the carbon dioxide from the raw material gas, and a compressor that is provided upstream or downstream of the selective separator and that pressurizes the raw material gas sent to the selective separator or the carbon dioxide separated by the selective separator. With this configuration, the separated and captured carbon dioxide can be cooled and liquefied highly efficiently at a suitable pressure and temperature. Furthermore, in a configuration in which the compressor is provided upstream of the selective separator, highly efficient selective separation of carbon dioxide can be performed.

[0016] Furthermore, in the carbon dioxide capture system of the present invention, the separation and capture device is provided with a high-pressure tank that stores the carbon dioxide pressurized by the compressor, and the liquefaction storage device liquefies and stores the carbon dioxide supplied from the high-pressure tank. With this configuration, the separated and captured carbon dioxide can be temporarily stored in the high-pressure tank. Therefore, the flow rate of carbon dioxide sent to the cooling and liquefaction chamber can be adjusted so that the temperature and pressure in the cooling and liquefaction chamber are suitable for cooling and liquefying carbon dioxide. This allows for highly efficient cooling and liquefaction. Furthermore, even in a narrow space where the installation space or working space for the separation and capture device is limited, a large amount of gas containing carbon dioxide can be stored in the high-pressure tank, allowing for highly efficient liquefaction and storage of carbon dioxide with a compact device configuration.

[0017] Furthermore, because the separated and captured carbon dioxide can be temporarily stored in the high-pressure tank, carbon dioxide separation and capture can be performed with the separation and capture device and the liquefaction storage device separated. For example, in a traveling vehicle or other mobile device that generates a raw gas containing carbon dioxide, carbon dioxide can be efficiently separated and captured from the raw gas generated while traveling and temporarily stored in the high-pressure tank. Then, once a predetermined amount of carbon dioxide has been stored in the high-pressure tank, it may be moved to a location where a liquefaction storage device is installed and connected to the liquefaction storage device. In this way, the carbon dioxide stored in the high-pressure tank is supplied to the liquefaction storage device, liquefied by cooling with a Stirling refrigerator in a cooling and liquefaction chamber, and stored in a container. In this way, even in a mobile device, which was difficult to do with conventional technology, it is possible to separate and capture the generated carbon dioxide and reduce the amount of carbon dioxide emitted into the outside air.

[0018] In the carbon dioxide capture system of the present invention, the high-pressure tank may be detachable from the separation and capture device, and the liquefaction storage device may be connected to the high-pressure tank detached from the separation and capture device to liquefy and store the carbon dioxide supplied from the high-pressure tank. This makes it possible to perform highly efficient capture and liquefy storage of carbon dioxide with a compact device configuration even in places where installation space is limited.

[0019] Furthermore, in the carbon dioxide capture system of the present invention, the liquefaction storage device may have a cooling and liquefaction chamber that cools and liquefies the carbon dioxide with the Stirling refrigerator, and a pressure regulator that adjusts the pressure of the carbon dioxide in the cooling and liquefaction chamber may be provided at least either upstream or downstream of the cooling and liquefaction chamber. This makes it possible to adjust the pressure and temperature of the carbon dioxide in the cooling and liquefaction chamber to levels suitable for a phase change, and to cool and liquefy the carbon dioxide highly efficiently using the Stirling refrigerator.

[0020] The carbon dioxide capture system of the present invention may also include a control device that controls the pressure regulator, and the control device may control the pressure regulator so that the pressure of the carbon dioxide in the cooling and liquefaction chamber is 0.518 to 4.5 MPa. By controlling the carbon dioxide in the cooling and liquefaction chamber to a suitable pressure range in this way, a decrease in heat exchange efficiency in the cooling and liquefaction chamber due to solidification of carbon dioxide, i.e., the generation of dry ice, etc., is suppressed, and highly efficient cooling and liquefaction can be performed. Furthermore, carbon dioxide can be compressed to a suitable pressure using a general single-stage compression compressor, without using an expensive multi-stage compression high-pressure compressor or the like.

[0021] Furthermore, the carbon dioxide capture system of the present invention may include a control device that controls the pressure regulator and a temperature sensor that detects the temperature at the inlet, inside, or outlet of the cooling and liquefaction chamber, and the control device may control the pressure regulator based on the temperature detected by the temperature sensor. This makes it possible to adjust the pressure and temperature of the carbon dioxide in the cooling and liquefaction chamber to levels suitable for a phase change, thereby enabling highly efficient cooling and liquefaction of carbon dioxide.

[0022] The carbon dioxide capture system of the present invention may also include a pressure sensor that detects the pressure at the inlet, inside, or outlet of the cooling and liquefaction chamber, and the control device may control the pressure regulator based on the temperature detected by the temperature sensor and the pressure detected by the pressure sensor. This makes it possible to adjust the pressure and temperature of the carbon dioxide in the cooling and liquefaction chamber to levels suitable for a phase change, and to perform highly efficient cooling and liquefaction of carbon dioxide.

[0023] Furthermore, in the carbon dioxide capture system of the present invention, the liquefied storage device may be provided with a gas-liquid separator that separates the carbon dioxide cooled in the cooling and liquefaction chamber into gas and liquid and sends the gaseous carbon dioxide to a location outside the container. This allows gases other than carbon dioxide and impurities contained in the separated and recovered carbon dioxide to be separated from the liquefied carbon dioxide and discharged outside the container together with the gaseous carbon dioxide. This makes it possible to separate highly pure carbon dioxide and store it in a liquefied state. It also makes it possible to prevent the liquefied carbon dioxide from evaporating due to heat transfer from the outside, which could cause an excessive increase in the pressure inside the piping, container, etc., thereby enabling safe liquefied storage of carbon dioxide.

[0024] Furthermore, in the carbon dioxide capture system of the present invention, the high-pressure tank and the container may be provided with information recording means for recording information about the carbon dioxide in a readable and rewritable manner. This makes it possible to record all information about the carbon dioxide from the process of storing the carbon dioxide-containing gas in the high-pressure tank to the process of storing the liquefied carbon dioxide in the container. This allows for safe management of carbon dioxide. [Brief explanation of the drawings]

[0025] [Figure 1] 1 is a diagram showing a schematic configuration of a carbon dioxide capture system according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0026] A carbon dioxide capture system 1 according to an embodiment of the present invention will be described in detail below with reference to the drawings. Fig. 1 is a diagram showing a schematic configuration of a carbon dioxide capture system 1 according to an embodiment of the present invention. Referring to Fig. 1, the carbon dioxide capture system 1 is a system that separates and captures carbon dioxide from a raw material gas containing carbon dioxide, and stores the carbon dioxide in a container 36. The carbon dioxide capture system 1 includes a separation and capture device 2 that separates and captures carbon dioxide from the raw material gas, and a liquefaction and storage device 3 that liquefies the carbon dioxide separated and captured by the separation and capture device 2, and stores the carbon dioxide in the container 36.

[0027] The separation and capture device 2 is a device that selectively separates and captures carbon dioxide from a raw material gas that contains carbon dioxide. The raw material gas from which the separation and capture device 2 separates and captures carbon dioxide is, for example, engine exhaust gas from various vehicles such as automobiles (not shown), as well as combustion exhaust gas emitted from mobile equipment, work equipment, power generation facilities, combustion equipment, etc. for industrial, agricultural, construction, and other various industries.

[0028] The raw material gas may be natural gas, coal gas, petroleum gas, or other synthetic gases, or may be biogas generated from food waste, wood, livestock manure, or other biological waste. The carbon dioxide capture system 1 may be used for separating and capturing carbon dioxide from various synthetic gases containing carbon dioxide in processes for producing various fuels, etc.

[0029] The separation and capture device 2 has a selective separator 10 that selectively separates carbon dioxide from a raw material gas containing carbon dioxide. The selective separator 10 has a permeable membrane (not shown) that selectively allows carbon dioxide gas to permeate, i.e., a CO2-facilitated transport membrane, and is a device that separates and captures carbon dioxide by membrane separation.

[0030] In this way, the selective separator 10 using membrane separation does not require an amine aqueous solution or a heating device to heat it, as is the case with chemical absorption, and can selectively capture carbon dioxide with a simple and compact configuration. That is, the membrane separation method, which separates and captures carbon dioxide using a permeable membrane that selectively allows carbon dioxide to permeate, has the advantage of not requiring an expensive absorption solution as in chemical absorption or physical absorption. Another advantage of membrane separation is that it does not require complex or large equipment as is the case with cryogenic separation or physical adsorption.

[0031] For this reason, the selective separator 10 that uses membrane separation is suitable for the carbon dioxide capture system 1 according to this embodiment, which uses a Stirling refrigerator 24, as will be described later. In other words, the carbon dioxide capture system 1 is suitable as an apparatus that separates and captures small volumes of carbon dioxide with a relatively small, simple, and inexpensive configuration, and can efficiently collect, disperse, and store carbon dioxide from exhaust gases from small- to medium-sized mobile machinery and the like.

[0032] The selective separator 10 is not limited to the separator that uses the membrane separation method described above. The selective separator 10 may be a device that selectively separates carbon dioxide using a chemical absorption method, a physical absorption method, a physical adsorption method, or other methods in addition to the membrane separation method.

[0033] Furthermore, the separation and recovery device 2 may not be provided with a selective separator 10 that selectively separates carbon dioxide from a raw material gas containing carbon dioxide. That is, the separation and recovery device 2 may be configured to pressurize the raw material gas containing carbon dioxide using a compressor 14 described later, store the pressurized gas in a high-pressure tank 19 described later, and supply the pressurized gas to the liquefied storage device 3, without selectively separating carbon dioxide from the raw material gas.

[0034] The raw material gas inlet 11 of the selective separator 10 is an inlet through which raw material gas containing carbon dioxide is supplied into the selective separator 10. A raw material gas pipe 37 is connected to the raw material gas inlet 11 of the selective separator 10. The raw material gas pipe 37 is connected so as not to reduce the performance of equipment that discharges the raw material gas to an engine exhaust port or the like of a mobile machine (not shown) that generates the raw material gas. The entire separation and recovery device 2 may be mounted on the mobile machine that generates the raw material gas.

[0035] The exhaust gas outlet 12 of the selective separator 10 is an outlet through which the raw material gas from which carbon dioxide has been separated in the selective separator 10, i.e., the raw material gas not containing carbon dioxide, is discharged from the selective separator 10. An exhaust gas pipe 38 is connected to the exhaust gas outlet 12 of the selective separator 10. The raw material gas from which carbon dioxide has been removed in the selective separator 10 is discharged to the outside or sent to another treatment device or storage device via the exhaust gas pipe 38.

[0036] The carbon dioxide outlet 13 of the selective separator 10 is an outlet through which the carbon dioxide gas selectively separated in the selective separator 10 is sent out from the selective separator 10. The carbon dioxide outlet 13 is connected to a carbon dioxide gas pipe 39 which serves as a path for the carbon dioxide gas, and the carbon dioxide gas pipe 39 is connected to the liquefaction chamber inlet 22 of the cooling liquefaction chamber 21 of the liquefaction storage device 3.

[0037] The separation and recovery device 2 may also be provided with a compressor 14 and a high-pressure tank 19. Specifically, the compressor 14 increases the pressure of the carbon dioxide separated in the selective separator 10 to a pressure value at which the carbon dioxide can be refrigerated and liquefied, and is provided in the exhaust gas piping 38 downstream of the selective separator 10. For example, when a commercially available compressor is used as the compressor 14, the internal pressure of the high-pressure tank 19 can be increased to approximately 4.5 MPa.

[0038] In this manner, by using a configuration in which the carbon dioxide gas separated in the selective separator 10 is pressurized by the compressor 14, the separated and recovered carbon dioxide can be cooled and liquefied at an appropriate pressure and temperature in the liquefied storage device 3 with high efficiency, as will be described in detail later.

[0039] Furthermore, when high-pressure raw gas is required in the carbon dioxide separation process in the selective separator 10, a compressor 14 (not shown) may be provided in the raw gas piping 37 upstream of the selective separator 10 to increase the pressure of the raw gas sent to the selective separator 10.

[0040] In this manner, by using the compressor 14 to compress the raw gas and send it to the selective separator 10, the carbon dioxide separation process in the selective separator 10 can be carried out efficiently, and highly efficient selective separation of carbon dioxide can be performed.

[0041] Furthermore, by providing a compressor 14 upstream of the selective separator 10 so as to pressurize the raw material gas, the raw material gas can be pressurized so that the carbon dioxide gas separated in the selective separator 10 reaches a predetermined pressure. Therefore, the carbon dioxide separated and recovered in the selective separator 10 can be cooled and liquefied at an appropriate pressure and temperature in the liquefaction storage device 3 with high efficiency.

[0042] The high-pressure tank 19 is a storage container that temporarily stores the carbon dioxide gas separated by the selective separator 10. The high-pressure tank 19 is provided downstream of the compressor 14 on the carbon dioxide gas piping 39, and stores the carbon dioxide gas pressurized by the compressor 14. Note that the high-pressure tank 19 may use an adsorbent such as zeolite or activated carbon that can physically adsorb and desorb carbon dioxide gas.

[0043] A check valve 18 may be provided in the carbon dioxide gas pipe 39 upstream of the high-pressure tank 19 to prevent backflow from the high-pressure tank 19 toward the compressor 14. This prevents the carbon dioxide stored in the high-pressure tank 19 from flowing back toward the selective separator 10, allowing the separation and capture device 2 to separate and capture carbon dioxide with high efficiency.

[0044] By providing the high-pressure tank 19 in the separation and recovery device 2 in this manner, the flow rate of carbon dioxide sent to the cooling and liquefaction chamber 21 of the liquefaction storage device 3 can be suitably adjusted by the first pressure regulator 20, which will be described later. In other words, since carbon dioxide gas can be temporarily stored in the high-pressure tank 19, the flow rate of carbon dioxide can be suitably increased or decreased by the first pressure regulator 20 while the selective separator 10 performs efficient separation and recovery of carbon dioxide.

[0045] As a result, the flow rate of carbon dioxide sent to cooling and liquefaction chamber 21 can be adjusted by first pressure regulator 20 so that the temperature and pressure inside cooling and liquefaction chamber 21 become values ​​suitable for cooling and liquefying carbon dioxide. Therefore, liquefaction storage device 3 can perform highly efficient cooling and liquefaction of carbon dioxide.

[0046] Furthermore, the separation and capture device 2 can temporarily store the carbon dioxide separated and captured by the selective separator 10 in the high-pressure tank 19, so that separation and capture of carbon dioxide can be performed while the separation and capture device 2 is separated from the liquefied storage device 3. Specifically, the carbon dioxide gas piping 39 may be provided with a detachable connection part (not shown) at a position where the separation and capture device 2 and the liquefied storage device 3 are connected.

[0047] With this configuration, for example, in a moving vehicle or other mobile device that generates a raw material gas containing carbon dioxide, carbon dioxide can be efficiently separated and recovered from the raw material gas generated while the vehicle is moving, and temporarily stored in the high-pressure tank 19.

[0048] Then, once a predetermined amount of carbon dioxide has been stored in the high-pressure tank 19, a mobile device or the like equipped with the separation and recovery device 2 can be moved to the location where the liquefaction storage device 3 is installed, and the separation and recovery device 2 can be connected to the liquefaction storage device 3.

[0049] As a result, the carbon dioxide stored in high-pressure tank 19 is supplied to cooling and liquefaction chamber 21 of liquefaction storage device 3, where it is cooled and liquefied by Stirling refrigerator 24 and stored in container 36. In this way, even in a mobile device, which was difficult to do with conventional technology, the generated carbon dioxide can be separated and captured by separation and capture device 2, liquefied in liquefaction storage device 3, and stored in container 36, thereby reducing the amount of carbon dioxide emitted into the outside air.

[0050] In addition, in a configuration in which the separation and recovery device 2 and the liquefaction storage device 3 are separated, the high-pressure tank 19 may be provided detachably to the carbon dioxide gas pipe 39 so that it can be removed from the separation and recovery device 2.

[0051] By providing such a detachable high-pressure tank 19, the carbon dioxide stored in the high-pressure tank 19 can be sent to the cooling and liquefaction chamber 21 of the liquefaction storage device 3 without directly connecting the separation and recovery device 2 and the liquefaction storage device 3.

[0052] That is, once a predetermined amount of carbon dioxide has been stored in the high-pressure tank 19, the high-pressure tank 19 can be removed from the separation and recovery device 2 and connected to the liquefaction storage device 3, and the carbon dioxide temporarily stored in the high-pressure tank 19 can be supplied to the cooling and liquefaction chamber 21. In this configuration, the carbon dioxide separated and recovered by the separation and recovery device 2 can be cooled and liquefied in the liquefaction storage device 3 and stored in the container 36, without having to move the separation and recovery device 2 to the location where the liquefaction storage device 3 is installed.

[0053] Furthermore, even in a narrow space where the space for installing the separation and recovery device 2 and the liquefaction storage device 3 and the working space are limited, a large amount of gas including carbon dioxide can be stored in the high-pressure tank 19. Therefore, highly efficient liquefaction and storage of carbon dioxide can be achieved with a compact device configuration.

[0054] Furthermore, a tag 50 capable of recording, identifying, and communicating information, such as an RFID (Radio Frequency Identification) tag, may be attached to the high-pressure tank 19 as information recording means. This allows information about the carbon dioxide-containing gas stored in the high-pressure tank 19 to be recorded on the tag 50 as readable and writable accurate data, enabling safe management.

[0055] Furthermore, a pre-cooling heat exchanger 15 for cooling the raw gas supplied to the selective separator 10 may be provided in the raw gas piping 37 upstream of the selective separator 10. The pre-cooling heat exchanger 15 cools the raw gas supplied to the selective separator 10 to a temperature suitable for selective separation. The pre-cooling heat exchanger 15 may be connected to a cooling device 17 via a cooling water piping 16, for example.

[0056] In the pre-cooling heat exchanger 15, the raw material gas is cooled by a heat medium such as cooling water that has been cooled in a cooling device 17 and circulates through the pre-cooling heat exchanger 15. This allows high-temperature raw material gas such as engine exhaust to be pre-cooled to a suitable temperature, for example, 50°C or lower, and carbon dioxide can be efficiently separated in the selective separator 10.

[0057] Liquefaction storage device 3 is a device that stores the carbon dioxide separated and recovered by separation and recovery device 2. Liquefaction storage device 3 has cooling and liquefaction chamber 21 in which carbon dioxide gas is cooled and liquefied, Stirling refrigerator 24 that cools the carbon dioxide in cooling and liquefaction chamber 21, and container 36 that stores the carbon dioxide cooled and liquefied in cooling and liquefaction chamber 21.

[0058] The cooling liquefaction chamber 21 is a chamber for cooling the carbon dioxide gas separated in the separation and recovery device 2 to cause a phase change, i.e., condense it by dissipating heat, and liquefy it. As described above, the liquefaction chamber inlet 22 of the cooling liquefaction chamber 21 is connected to the carbon dioxide gas pipe 39 which leads to the selective separator 10 of the separation and recovery device 2. In addition, the liquefaction chamber outlet 23 of the cooling liquefaction chamber 21 is connected to the carbon dioxide liquid pipe 40 which leads to the container 36.

[0059] Stirling refrigerator 24 is a refrigeration device that cools and liquefies the carbon dioxide gas separated in separation and recovery device 2 in cooling and liquefying chamber 21. That is, Stirling refrigerator 24 cools and liquefies the carbon dioxide in cooling and liquefying chamber 21 by a refrigeration cycle that utilizes the Stirling cycle.

[0060] Specifically, the Stirling refrigerator 24 is a Stirling cycle refrigerator having a cylinder, piston, regenerative heat exchanger, heat dissipation heat exchanger, and the like (not shown) that constitute a Stirling cycle engine, in an airtight space (not shown) filled with high-pressure working gas, such as helium gas.

[0061] Stirling refrigerator 24 is provided with motor 25 that drives a piston in a cylinder (not shown) to operate the Stirling cycle. Stirling refrigerator 24 may also be a free-piston Stirling cycle refrigerator. That is, motor 25 may reciprocate a compression piston (not shown) via a crank mechanism (not shown), and may also reciprocate a displacer piston or expansion piston (not shown) with a certain phase difference.

[0062] Cooling head 26, which is the heat absorption part of Stirling refrigerator 24, is provided inside cooling liquefaction chamber 21. Cooling fins 27 that promote heat absorption from the carbon dioxide in cooling liquefaction chamber 21 are formed on the outer periphery of cooling head 26. This improves the efficiency of heat exchange between the working gas of Stirling refrigerator 24 and the carbon dioxide in cooling liquefaction chamber 21, enabling highly efficient cooling.

[0063] Note that a cooling heat exchanger (not shown) may be used as the heat absorption part of Stirling refrigerator 24 instead of cooling head 26. For example, the cooling heat exchanger may be formed by using multiple cooling thin tubes to connect a low-temperature chamber (not shown), i.e., an expansion chamber, of Stirling refrigerator 24 with a regenerative heat exchanger. Furthermore, cooling fins 27 may be formed on the cooling heat exchanger, just like cooling head 26.

[0064] The cooling capacity of Stirling refrigerator 24 is controlled by the rotation speed or ON / OFF of motor 25. The cooling capacity of Stirling refrigerator 24 may also be controlled by controlling circulation pump 31 and heat dissipation fan 30 of heat dissipation device 28, which will be described later.

[0065] Stirling refrigerator 24 is provided with heat dissipation device 28 that cools the working gas of Stirling refrigerator 24. Specifically, heat dissipation device 28 has refrigerant piping 32 configured to circulate a refrigerant that cools the working gas of Stirling refrigerator 24. Refrigerant piping 32 is connected to a heat dissipation section of Stirling refrigerator 24, for example, a heat dissipation heat exchanger (not shown) near a compression chamber (not shown) inside the cylinder.

[0066] The refrigerant piping 32 is provided with a circulation pump 31 for circulating the refrigerant, a radiator 29 for cooling the refrigerant by exchanging heat between the refrigerant and outside air, etc., and a heat dissipation fan 30 for sending outside air, etc. to the radiator 29 to cool the refrigerant.

[0067] With this configuration, heat dissipation device 28 cools the working gas of Stirling refrigerator 24, and Stirling refrigerator 24 can highly efficiently cool and liquefy the carbon dioxide separated in separation and recovery device 2 using cooling head 26 in cooling and liquefaction chamber 21.

[0068] That is, the liquefaction storage device 3 can efficiently cool and liquefy the carbon dioxide gas separated and recovered by the separation and recovery device 2 by utilizing a Stirling cycle that is capable of high-performance low-temperature cooling.

[0069] Specifically, the carbon dioxide capture system 1 can perform highly efficient liquefaction and storage of separated and captured carbon dioxide with a simple device configuration, without using expensive multi-stage high-pressure compressors that compress carbon dioxide to high pressures, or complex and expensive multi-stage or multi-element refrigeration machines that cool it to low temperatures.

[0070] In particular, it will be possible to realize an unprecedented capture scheme of decentralized collection and centralized liquefaction recovery of carbon dioxide from small and medium-sized carbon dioxide emission sources such as small and medium-sized boilers and combustors that use fossil fuels, various engine-type generators, various vehicles, and cogeneration systems.

[0071] The liquefaction storage device 3 may also be provided with a gas-liquid separator 34 that separates the carbon dioxide cooled in the cooling and liquefaction chamber 21 into gas and liquid components. Specifically, the gas-liquid separator 34 is provided in the carbon dioxide liquid piping 40 downstream of the cooling and liquefaction chamber 21, and separates the carbon dioxide cooled in the cooling and liquefaction chamber 21 into a gas phase component and a liquid phase component, and separates gases other than carbon dioxide contained in the gas phase from the liquid phase component of the carbon dioxide.

[0072] The gas-liquid separator 34 is provided with an exhaust pipe 41 that sends the gas phase component of the carbon dioxide resulting from gas-liquid separation, i.e., the gas, to a location other than the container 36, such as the outside of the liquefied storage device 3. The exhaust pipe 41 may be provided with an exhaust valve 35, an electric heater (not shown), a carbon dioxide sensor, etc., that open and close the exhaust pipe 41 to control the release of trace amounts of carbon dioxide from the gas-liquid separator 34, gases other than carbon dioxide such as nitrogen and oxygen that could not be separated by the separation and recovery device 2, and impurities.

[0073] By providing the gas-liquid separator 34 in the carbon dioxide liquid pipe 40 in this way, gases other than carbon dioxide contained in the separated and recovered carbon dioxide, impurities, etc. can be separated from the liquefied carbon dioxide and discharged together with the gaseous carbon dioxide to the outside of the container 36. Therefore, the liquefied storage device 3 can separate carbon dioxide with high purity and store it in a liquefied state.

[0074] Furthermore, by providing the gas-liquid separator 34, it is possible to prevent the carbon dioxide liquefied in the cooling and liquefaction chamber 21 from evaporating due to heat transfer from the outside, etc., and thereby suppressing an excessive increase in the pressure inside the carbon dioxide liquid pipe 40, the container 36, etc. Therefore, it is possible to safely store carbon dioxide in a liquefied state.

[0075] Container 36 is a storage container that stores the carbon dioxide separated in separation and recovery device 2 and cooled and liquefied in cooling and liquefaction chamber 21. Container 36 is formed so that the carbon dioxide that has been pressurized by compressor 14 and cooled and liquefied in cooling and liquefaction chamber 21 at a predetermined pressure can be injected into container 36 at approximately the same pressure and temperature as when it was liquefied and cooled.

[0076] Specifically, the container 36 may be formed, for example, with a vacuum insulation structure so as to suppress heating of the carbon dioxide due to heat transfer from the outside during the liquefaction and storage operation in which cooled liquefied carbon dioxide is injected. In a cryogenic container such as the container 36 formed with a vacuum insulation structure, the temperature of the carbon dioxide is, for example, about minus 20°C.

[0077] Furthermore, the container 36 is detachably connected to the carbon dioxide liquid piping 40, and is configured so that it can be removed from the liquefied storage device 3 and transported while carbon dioxide is stored. The container 36 has sufficient pressure resistance to withstand the pressure of the increasing pressure of carbon dioxide, even when the temperature of the stored carbon dioxide rises to approximately the outside air temperature after carbon dioxide has been sealed in. When the container 36 is configured as a cryogenic container, the internal pressure is, for example, approximately 2.0 MPa. To ensure safety, the container 36 may be provided with a safety valve (not shown) that releases evaporated gas components of the stored carbon dioxide to the outside when the internal pressure becomes excessive.

[0078] The second pressure regulator 33 provided in the carbon dioxide liquid pipe 40 has a function of maintaining the internal pressure of the container 36 at a predetermined value. For example, even when the pressure in the cooling and liquefaction chamber 21 is higher than the internal pressure of the container 36, which is about 2.0 MPa, the second pressure regulator 33 has a function of maintaining the pressure in the container 36 at a value of about 2.0 MPa as described above. The second pressure regulator 33 may also have a function of setting the internal pressure of the container 36 lower or higher than the above value.

[0079] Furthermore, similar to the tag 50 of the high-pressure tank 19 described above, a tag 51 capable of recording information, identification, and communication, such as an RFID tag, may be attached to the container 36 as information recording means. This allows information about the carbon dioxide stored in the container 36 to be recorded on the tag 51 as accurate, readable and writable data, enabling the carbon dioxide to be managed safely.

[0080] For example, by attaching tags 50, 51 to both the high-pressure tank 19 and the container 36, i.e., attaching the tag 50 to the high-pressure tank 19 and the tag 51 to the container 36, carbon dioxide can be safely managed even when high-pressure tanks 19 are collected from multiple different locations and carbon dioxide is liquefied and stored collectively in a single container 36.

[0081] Specifically, information about carbon dioxide at each location where carbon dioxide-containing gas is stored is recorded on the tag 50 attached to each high-pressure tank 19. Then, when carbon dioxide is liquefied and stored in container 36 in liquefaction storage device 3, information about the carbon dioxide to be liquefied and stored is additionally recorded on tag 51 of container 36 in addition to the information obtained from tag 50 of high-pressure tank 19. As a result, the origin of all carbon dioxide is recorded on tag 51 of container 36 where the carbon dioxide is ultimately liquefied and stored. Therefore, carbon dioxide can be managed safely.

[0082] As described above, the high-purity carbon dioxide separated and recovered by the carbon dioxide recovery system 1 and stored in the liquefied state in the container 36 can be used for various purposes such as medical use and beverages in addition to industrial use.

[0083] Next, the control system and control operation of the carbon dioxide capture system 1 will be described in detail. The carbon dioxide capture system 1 has a control device 42 that controls the operation of the carbon dioxide capture system 1. The control device 42 has an operation input unit, a display unit, etc., which are not shown, and the compressor 14, the cooling device 17, the motor 25 of the Stirling refrigerator 24, the heat dissipation fan 30, the circulation pump 31, and the exhaust valve 35 may be controllably connected to the control device 42.

[0084] In addition, the control device 42 is controllably connected to a first pressure regulator 20 and a second pressure regulator 33 as pressure regulators, and is connected to temperature sensors 43, 44, 45, 48, pressure sensors 46, 47, 49, and other sensors not shown in the figure so that information can be communicated.

[0085] The control device 42 may be arranged in either the separation and recovery device 2 or the liquefaction storage device 3, or may be arranged in both the separation and recovery device 2 and the liquefaction storage device 3. That is, although not shown, the control device 42 may be configured such that a first control device is provided in the separation and recovery device 2 and a second control device is provided in the liquefaction storage device 3, and the first control device and the second control device are detachably connected by wire or wirelessly connected so as to be able to communicate information. Furthermore, the control device 42 may be provided in a housing or the like separate from the separation and recovery device 2 and the liquefaction storage device 3, as long as it is able to communicate information with the separation and recovery device 2 and the liquefaction storage device 3.

[0086] First pressure regulator 20 is a pressure regulator controlled by control device 42 to control the pressure and temperature of carbon dioxide in cooling and liquefaction chamber 21, and is provided on carbon dioxide gas piping 39 connected to liquefaction chamber inlet 22. Specifically, first pressure regulator 20 has a valve such as an electronic expansion valve or a needle valve whose opening is adjusted under the control of control device 42 and which can adjust the flow rate of carbon dioxide supplied to cooling and liquefaction chamber 21.

[0087] In other words, first pressure regulator 20 as a pressure regulator senses the pressure of the gas containing carbon dioxide on the inlet side, inside, outlet side, etc. of cooling liquefaction chamber 21 using pressure sensors 46, 47, 49 via control device 42, and controls the pressure on the outlet side to a predetermined pressure while monitoring the temperature detected by temperature sensors 43, 44, 45, 48. In addition, first pressure regulator 20 has a function of blocking the inflow of gas containing carbon dioxide into cooling liquefaction chamber 21 on the inlet side of cooling liquefaction chamber 21.

[0088] Carbon dioxide gas pipe 39 connected to liquefaction chamber inlet 22 may be provided with a temperature sensor 43 that detects the temperature of the carbon dioxide separated in selective separator 10 and supplied to cooling and liquefaction chamber 21, and a pressure sensor 49 that detects the pressure. Cooling and liquefaction chamber 21 may also be provided with a pressure sensor 46 that detects the pressure of the carbon dioxide inside cooling and liquefaction chamber 21, and a temperature sensor 44 that detects the temperature. Carbon dioxide liquid pipe 40 connected to liquefaction chamber outlet 23 of cooling and liquefaction chamber 21 may also be provided with temperature sensors 45 and 48 that detect the temperature of the carbon dioxide cooled and liquefied by Stirling refrigerator 24 in cooling and liquefying chamber 21, and a pressure sensor 47 that detects the pressure.

[0089] The control device 42 adjusts the valve opening of the first pressure regulator 20 so that the carbon dioxide temperature detected by the temperature sensors 43, 44, 45, 48, the carbon dioxide pressure detected by the pressure sensors 46, 47, 49, etc., reach predetermined values.

[0090] That is, the control device 42 performs a predetermined calculation based on the carbon dioxide temperature detected by the temperature sensors 43, 44, 45, 48, the carbon dioxide pressure detected by the pressure sensors 46, 47, 49, etc., and controls the adjustment of the valve opening of the first pressure regulator 20.

[0091] As a result, the pressure and temperature of the carbon dioxide in the cooling and liquefaction chamber 21 are controlled to values ​​suitable for cooling and liquefaction, i.e., values ​​suitable for the phase change of carbon dioxide, thereby achieving highly efficient cooling and liquefaction of carbon dioxide.

[0092] A second pressure regulator 33 may be provided downstream of cooling and liquefying chamber 21, i.e., in carbon dioxide liquid piping 40 connected to liquefaction chamber outlet 23. Second pressure regulator 33 is a pressure regulator that is controlled by control device 42 together with the cooling capacity control of Stirling refrigerator 24, and controls the pressure and temperature of carbon dioxide in cooling and liquefying chamber 21.

[0093] Specifically, second pressure regulator 33 has a valve such as an electronic expansion valve or a needle valve whose opening is adjusted under the control of control device 42 and which can adjust the flow rate of carbon dioxide that is cooled and liquefied by Stirling refrigerator 24 and supplied from cooling and liquefaction chamber 21 to container 36.

[0094] In other words, second pressure regulator 33 as a pressure regulator senses the pressure of the gas containing carbon dioxide on the inlet side, inside, outlet side, etc. of cooling liquefaction chamber 21 using pressure sensors 46, 47, 49 via control device 42, and controls the pressure on the outlet side to a predetermined pressure while monitoring the temperature detected by temperature sensors 43, 44, 45, 48. In addition, second pressure regulator 33 has the function of blocking the outflow of liquefied carbon dioxide and gas from cooling liquefaction chamber 21 on the outlet side of cooling liquefaction chamber 21.

[0095] The control device 42 adjusts the valve opening of the second pressure regulator 33 so that the carbon dioxide temperature detected by the temperature sensors 43, 44, 45, 48, the carbon dioxide pressure detected by the pressure sensors 46, 47, 49, etc., reach predetermined values.

[0096] That is, the control device 42 performs a predetermined calculation based on the carbon dioxide temperature detected by the temperature sensors 43, 44, 45, 48, the carbon dioxide pressure detected by the pressure sensors 46, 47, 49, etc., and controls the adjustment of the valve opening of the second pressure regulator 33.

[0097] As a result, the pressure and temperature of the carbon dioxide in the cooling and liquefaction chamber 21 are controlled to values ​​suitable for cooling and liquefaction, i.e., values ​​suitable for the phase change of carbon dioxide, and also controlled so that suitable storage in the container 36 is possible. Therefore, highly efficient cooling and liquefaction of carbon dioxide is achieved.

[0098] It is also possible to provide a configuration in which at least one of the first pressure regulator 20 and the second pressure regulator 33 is provided. Alternatively, both the first pressure regulator 20 and the second pressure regulator 33 may be provided, and the pressure and temperature of carbon dioxide in the cooling liquefaction chamber 21 may be controlled by controlling both of them.

[0099] Here, the pressure of carbon dioxide in cooling and liquefaction chamber 21 is controlled to be equal to or higher than the triple point pressure by control device 42. More specifically, the pressure of carbon dioxide in cooling and liquefaction chamber 21 is controlled to be 0.518 to 4.5 MPa, preferably 0.518 to 2.5 MPa.

[0100] In this way, the carbon dioxide pressure in the cooling and liquefaction chamber 21 is controlled to a suitable range, thereby preventing the solidification of carbon dioxide, i.e., the generation of dry ice, from clogging the cooling and liquefaction chamber 21 and the carbon dioxide liquid piping 40. This prevents a decrease in heat exchange efficiency due to the generation of dry ice, and enables highly efficient cooling and liquefaction.

[0101] Furthermore, it is sufficient for compressor 14 to be able to pressurize the carbon dioxide separated in selective separator 10 to approximately 0.518 to 4.5 MPa. In other words, it is sufficient for compressor 14 to be able to pressurize the carbon dioxide to a pressure that allows it to be efficiently cooled and liquefied by Stirling refrigerator 24. Therefore, it is possible to employ a general, inexpensive single-stage compression compressor as compressor 14, without using an expensive multi-stage compression high-pressure compressor or the like.

[0102] Furthermore, highly efficient cooling using Stirling refrigerator 24 enables efficient cooling and liquefaction of carbon dioxide in cooling and liquefaction chamber 21. Specifically, control device 42 controls at least one of first pressure regulator 20 and second pressure regulator 33 so that the carbon dioxide in cooling and liquefaction chamber 21 is cooled by Stirling refrigerator 24 to a temperature equal to or higher than the triple point temperature, i.e., −56.6°C or higher, and lower than the boiling saturation temperature according to the pressure, preferably −56.6°C to +10°C, and more preferably −56.6°C to −12°C.

[0103] In other words, the control device 42 controls the Stirling refrigerator 24 so that the temperature of the carbon dioxide in the cooling and liquefaction chamber 21 is between the boiling saturation temperature and the melting saturation temperature according to the pressure, and also controls at least one of the first pressure regulator 20 and the second pressure regulator 33.

[0104] In addition, control device 42 may perform control to adjust the rotation speed of motor 25 of Stirling refrigerator 24 based on either the temperature of carbon dioxide detected by temperature sensors 43, 44, 45, and 48 or the pressure of carbon dioxide detected by pressure sensors 46, 47, and 49.

[0105] Furthermore, control device 42 may control the ON / OFF of motor 25 of Stirling refrigerator 24 based on either the temperature of carbon dioxide detected by temperature sensors 43, 44, 45, and 48 or the pressure of carbon dioxide detected by pressure sensors 46, 47, and 49.

[0106] In addition to the above controls, control device 42 may also control the cooling capacity of Stirling refrigerator 24 by controlling circulation pump 31 and heat dissipation fan 30 of heat dissipation device 28 based on either the temperature of carbon dioxide detected by temperature sensors 43, 44, 45, and 48 or the pressure of carbon dioxide detected by pressure sensors 46, 47, and 49.

[0107] The control device 42 may also perform control to adjust the rotation speed of the compressor 14 based on either the temperature of the carbon dioxide detected by the temperature sensors 43, 44, 45, and 48 or the pressure of the carbon dioxide detected by the pressure sensors 46, 47, and 49.

[0108] Furthermore, the control device 42 may control the opening and closing of the exhaust valve 35 based on the carbon dioxide pressure detected by the pressure sensor 47, etc. As a result, as described above, gases other than carbon dioxide and impurities contained in the separated and recovered gas containing carbon dioxide can be discharged to the outside, and high-purity carbon dioxide with little gases other than carbon dioxide and impurities can be stored. In addition, excessive pressure increases can be prevented, and the separated and recovered carbon dioxide can be safely liquefied and stored.

[0109] As explained above, according to the carbon dioxide capture system 1 of this embodiment, it is possible to adjust the pressure and temperature of the carbon dioxide in the cooling and liquefaction chamber 21 to levels suitable for a phase change, and highly efficient liquefaction and storage of carbon dioxide can be achieved through highly efficient cooling by the Stirling refrigerator 24. The carbon dioxide capture system 1 can efficiently separate and capture carbon dioxide with a simple configuration, and is particularly suitable for use in small and medium-sized mobile devices and the like, as a device for highly efficient separation and capture of carbon dioxide from combustion exhaust gases and the like, and for liquefying and storing it.

[0110] The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention. [Explanation of symbols]

[0111] 1: Carbon dioxide capture system 2: Separation and collection device 3: Liquefied storage equipment 10: Selective separator 14: Compressor 15: Pre-cooling heat exchanger 17: Cooling device 18: Check valve 19: High-pressure tank 20: First pressure regulator 21: Cooling liquefaction chamber 24: Stirling refrigerator 25: Motor 26: Cooling head 27: Cooling fin 28: Heat dissipation device 33: Second pressure regulator 34: Gas-liquid separator 35: Exhaust valve 36: Container 37: Raw material gas piping 38: Exhaust gas piping 39: Carbon dioxide gas piping 40: Carbon dioxide liquid piping 41: Exhaust pipe 42: Control device 43: Temperature sensor 44: Temperature sensor 45: Temperature sensor 46: Pressure sensor 47: Pressure sensor 48: Temperature sensor 49: Pressure sensor 50: Tags 51: Tags

Claims

1. a liquefaction storage device that liquefies carbon dioxide from a carbon dioxide-containing raw material gas and stores the liquefied carbon dioxide in a container; The liquefied storage device is detachably connected to a high-pressure tank that stores the raw material gas pressurized by a compressor, and the raw material gas supplied from the high-pressure tank is cooled by a Stirling refrigerator to liquefy the carbon dioxide and store it.

2. a separation and recovery device that selectively separates and recovers carbon dioxide from a raw material gas containing carbon dioxide; a liquefaction storage device that is detachably connected to the separation and recovery device and that liquefies the carbon dioxide separated and recovered by the separation and recovery device and stores the liquefied carbon dioxide in a container, A carbon dioxide capture system characterized in that the liquefaction storage device has a Stirling refrigerator that cools and liquefies the carbon dioxide separated and captured by the separation and capture device.

3. The carbon dioxide recovery system according to claim 2, characterized in that the separation and capture device comprises a selective separator that selectively separates the carbon dioxide from the raw material gas, and a compressor that is provided upstream or downstream of the selective separator and pressurizes the raw material gas sent to the selective separator or the carbon dioxide separated by the selective separator.

4. the separation and recovery device is provided with a high-pressure tank that stores the carbon dioxide pressurized by the compressor, The carbon dioxide recovery system according to claim 3, wherein the liquefied storage device liquefies and stores the carbon dioxide supplied from the high-pressure tank.

5. the high-pressure tank is detachable from the separation and recovery device; The carbon dioxide capture system according to claim 4, wherein the liquefaction storage device is connected to the high-pressure tank when it is removed from the separation and capture device, and liquefies and stores the carbon dioxide supplied from the high-pressure tank.

6. the liquefied storage device has a cooling and liquefaction chamber that cools and liquefies the carbon dioxide with the Stirling refrigerator, A carbon dioxide recovery system as described in any one of claims 2 to 5, characterized in that a pressure regulator for adjusting the pressure of the carbon dioxide in the cooling and liquefaction chamber is provided at least either upstream or downstream of the cooling and liquefaction chamber.

7. a control device for controlling the pressure regulator; 7. The carbon dioxide recovery system according to claim 6, wherein the control device controls the pressure regulator so that the pressure of the carbon dioxide in the cooling and liquefaction chamber is 0.518 to 4.5 MPa.

8. a control device for controlling the pressure regulator; a temperature sensor for detecting the temperature of the inlet, the inside, or the outlet of the cooling liquefaction chamber; 7. The carbon dioxide recovery system according to claim 6, wherein the control device controls the pressure regulator based on the temperature detected by the temperature sensor.

9. a pressure sensor for detecting the pressure at the inlet, inside, or outlet of the cooling liquefaction chamber; 9. The carbon dioxide capture system according to claim 8, wherein the control device controls the pressure regulator based on the temperature detected by the temperature sensor and the pressure detected by the pressure sensor.

10. The carbon dioxide recovery system described in claim 6, characterized in that the liquefied storage device is provided with a gas-liquid separator that separates the carbon dioxide cooled in the cooling and liquefaction chamber into gas and liquid and sends the gas phase carbon dioxide to a location other than the container.

11. 5. The carbon dioxide capture system according to claim 1, wherein the high-pressure tank and the container are provided with information recording means for recording information about the carbon dioxide in a readable and rewritable manner.

Images