Dry ice storage and marine vessel

Abstract

To provide a dry ice storage allowed to store carbon dioxide more easily and inexpensively and a marine vessel.SOLUTION: A dry ice storage comprises a storage body, a feed unit that is for feeding powdery dry ice into the storage body, an unloader unit that is for unloading the powdery dry ice from an interior of the storage body, and a fluidity improving unit that improves the fluidity of the powdery dry ice within the storage body. This makes it possible to store carbon dioxide in a solid state within the storage body. This increases the amount of storage per unit volume and eliminates the necessity to pressurize the interior of the storage body, so that management and transportation costs can be lowered.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to dry ice storage units and marine vessels. [Background technology]

[0002] When storing carbon dioxide, it is common to fill a liquefied component into a large pressure vessel such as a tank (for example, see Patent Document 1 below). In the tank described in Patent Document 1 below, the outer wall of the tank body is double-shelled, and the space between the shells is filled with a heat insulating material. This is said to maintain a low temperature inside the tank and allow the carbon dioxide to remain in a liquefied state. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2024-4406 Summary of the Invention [Problem to be solved by the invention]

[0004] However, when storing and transporting carbon dioxide in a liquefied state, the above-mentioned pressure vessel is required. However, due to its structure, pressure vessels cannot be easily made large. Therefore, there is an issue that it is not possible to secure a sufficient storage volume per tank installation area.

[0005] The present disclosure has been made to solve the above-mentioned problems, and aims to provide a dry ice storage unit and a ship that can store large amounts of carbon dioxide more easily and inexpensively. [Means for solving the problem]

[0006] In order to solve the above problems, the dry ice storage unit of the present disclosure comprises a storage unit main body, a supply unit capable of supplying powdered dry ice into the storage unit main body, an outlet unit capable of transporting the powdered dry ice from the storage unit main body, and a fluidity improvement unit that improves the fluidity of the powdered dry ice within the storage unit main body.

[0007] The ship according to the present disclosure includes the above-described dry ice storage unit and a hull that houses the dry ice storage unit. [Effects of the Invention]

[0008] According to the present disclosure, it is possible to provide a dry ice storage unit and a ship that can store carbon dioxide more easily and inexpensively. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is an explanatory diagram showing an example of a value chain including a dry ice storage unit according to a first embodiment of the present disclosure. [Figure 2] 1 is a cross-sectional view showing the configuration of a dry ice storage section according to a first embodiment of the present disclosure, illustrating the state when dry ice is being poured in. FIG. [Figure 3] 1 is a cross-sectional view showing the configuration of a dry ice storage section according to a first embodiment of the present disclosure, illustrating the state when dry ice is being discharged. FIG. [Figure 4] FIG. 10 is a cross-sectional view showing a modified example of the dry ice storage section according to the first embodiment of the present disclosure, illustrating the state when dry ice is being poured in. [Figure 5] FIG. 10 is a cross-sectional view of a vessel according to a second embodiment of the present disclosure as viewed from the bow to stern, illustrating a state when dry ice is being poured in. [Figure 6] FIG. 10 is a cross-sectional view of a vessel according to a second embodiment of the present disclosure as viewed from the bow-stern direction, illustrating a state when dry ice is being discharged. [Figure 7] FIG. 10 is a diagram illustrating a modified example of the marine vessel according to the second embodiment of the present disclosure, illustrating a state during carbon dioxide emission. DETAILED DESCRIPTION OF THE INVENTION

[0010] First Embodiment A carbon dioxide value chain 1 including a dry ice storage unit 16 according to a first embodiment of the present disclosure will be described below with reference to Figures 1 to 3. This value chain 1 shows the route from when carbon dioxide is collected to when it is loaded onto a ship 18 for transportation.

[0011] (Value chain configuration) As shown in Figure 1, the value chain 1 includes a CO2 recovery device 11, a gas tank 12, a liquefaction device 13, a pre-cooling device 14, a dry ice conversion device 15 (DI conversion device in the figure), a dry ice storage section 16 (DI storage section in the figure), a loading arm 17, a ship 18, and a vapor component recovery section 19.

[0012] The CO2 recovery device 11 recovers gaseous carbon dioxide from the combustion exhaust gas of a CO2 emission source such as a plant. The recovered carbon dioxide is temporarily stored in a gas tank 12 and then sent to a liquefaction device 13. The liquefaction device 13 liquefies the gaseous carbon dioxide by pressurizing and cooling it. The liquefied carbon dioxide is sent to a dry ice generation device 15. The dry ice generation device 15 converts the liquefied carbon dioxide into powdered dry ice. An existing dry ice press is preferably used as the dry ice generation device 15.

[0013] The term "powdered dry ice" as used here not only includes powder, but also granular dry ice with larger particle sizes than powder, as well as even larger pellets and blocks. In other words, any aggregate of dry ice with fluidity is sufficient. The dry ice press machine described above is not required except for pellets and blocks.

[0014] The powdered dry ice is stored in a dry ice storage unit 16. The configuration of the dry ice storage unit 16 will be described later. The powdered dry ice discharged from the dry ice storage unit 16 is loaded onto a ship 18 using a loading arm 17 installed at a port or the like. The configuration of the ship 18 will be described in the second embodiment.

[0015] Here, in the dry ice generation device 15, the dry ice storage section 16, and the ship 18, some of the components of the powdered dry ice vaporize during handling. This vaporized carbon dioxide is recovered by the vaporized component recovery section 19 and sent to the pre-cooling device 14. The pre-cooling device 14 is a heat exchanger provided between the gas tank 12 and the liquefaction device 13.

[0016] The refrigerant supplied to pre-cooling device 14 is low-temperature gaseous carbon dioxide recovered by vapor component recovery section 19. This low-temperature carbon dioxide exchanges heat with relatively high-temperature carbon dioxide before liquefaction. This makes it possible to pre-cool the gaseous carbon dioxide before it is sent to liquefaction device 13. As a result, it is possible to keep the performance required of liquefaction device 13 low.

[0017] (Configuration of dry ice storage section) 2 and 3, the configuration of dry ice storage unit 16 will be described. As shown in Fig. 2, dry ice storage unit 16 includes storage main body 21, supply unit 22, discharge unit 23, and fluidity improvement unit 24.

[0018] The storage body 21 is a container for storing powdered dry ice. The storage body 21 is, for example, cylindrical, and its interior and exterior are airtight. The storage body 21 can be similar to an existing LNG (liquefied natural gas) tank. This type of tank is insulated by filling glass wool and perlite powder between an inner tank (special low-temperature steel) that holds the LNG and an outer tank (mainly made of prestressed concrete). Since the insulation method used in LNG tanks (boiling point: approximately -160°C) can be applied, long-term storage is possible. The amount of boil-off gas in an LNG tank is approximately 0.6% of the total volume per day, and it is thought that this amount will be less for dry ice, which has a higher temperature than LNG.

[0019] The supply unit 22 supplies powdered dry ice produced by the dry ice production device 15 into the storage unit main body 21. The supply unit 22 has a solid transport line 31, a gas supply unit 32, a supply pump 33, and a spray nozzle 34. The dry ice production device 15 is connected to the upstream side of the solid transport line 31, and the spray nozzle 34 is provided at the downstream end. The gas supply unit 32 supplies a carrier gas into the solid transport line 31. The carrier gas is a medium supplied to ensure the fluidity of the powdered dry ice within the piping. As the carrier gas, carbon dioxide as well as other stable gases can be used as appropriate. The supply pump 33 pressure-feeds the powdered dry ice and carrier gas from the dry ice production device 15 side toward the spray nozzle 34 side.

[0020] Spray nozzle 34 is provided inside reservoir body 21. Spray nozzle 34 has a large number of spray holes, from which powdered dry ice is dispersed into the space inside reservoir body 21. The powdered dry ice accumulates from the bottom of reservoir body 21 upward.

[0021] As an example, the discharge unit 23 is provided at the bottom of the storage unit main body 21. Although detailed illustration is omitted, the discharge unit 23 is, for example, a suction pump, a blower, or a belt conveyor, and is capable of discharging the powdered dry ice from the bottom of the storage unit main body 21 to the outside.

[0022] The fluidity improving unit 24 is a device for increasing the fluidity of powdered dry ice to facilitate its transport. The fluidity improving unit 24 includes an extraction unit 41, an agitation gas line 42, an agitation gas tank 43, a blower 44, and an agitation gas nozzle 45.

[0023] Extraction unit 41 is provided, for example, at the top of storage unit main body 21, and extracts and recovers gaseous carbon dioxide produced by the evaporation of part of the powdered dry ice, and supplies it to stirring gas line 42. A stirring gas tank 43, a blower 44, and a stirring gas nozzle 45 are provided on stirring gas line 42. Agitation gas tank 43 is a container for temporarily storing the above-mentioned vaporized components. A blower 44 is provided downstream of stirring gas tank 43 to pressurize carbon dioxide as a stirring gas.

[0024] A stirring gas nozzle 45, which is provided at the bottom of storage body 21, is connected to the downstream end of stirring gas line 42. Stirring gas nozzle 45 sprays carbon dioxide, which serves as a stirring gas and has been pressure-fed along stirring gas line 42, toward the powdered dry ice in storage body 21 (see FIG. 3). This allows the stirring gas to spread between the grains of powdered dry ice, thereby improving the fluidity of the powdered dry ice.

[0025] A branch line 46 that branches off toward the liquefaction device 13 is provided on the stirring gas line 42 downstream of the extraction section 41. That is, any amount of stirring gas that exceeds the amount required is sent again to the liquefaction device 13 through this branch line 46 and is subjected to liquefaction processing.

[0026] (Action and effect) Here, in the past, when storing carbon dioxide, it was common to fill a liquefied component into a tank or the like as a large pressure vessel. However, when storing or transporting carbon dioxide in a liquefied state, the above-mentioned pressure vessel is required. Due to its structure, a pressure vessel cannot be easily made large. Therefore, there was a problem that it was not possible to ensure a sufficient storage volume per tank's ground surface area. Furthermore, since there are only a limited number of suppliers that can build large pressure vessels, there were also problems such as rising construction prices and a prolonged construction period for plants due to a shortage of supply. In order to solve these problems, the present embodiment employs the above-mentioned configurations.

[0027] According to the above configuration, carbon dioxide can be stored in the storage body 21 as powdered dry ice, i.e., in a solid state. Because the density of a solid is higher than that of a liquid, the amount of carbon dioxide stored per unit volume can be increased. Furthermore, when storing solids (powdered dry ice), there is no need to pressurize the storage body 21, which reduces management and transportation costs. As a result, the range of suppliers for the dry ice storage body 16 is expanded, and price competition can be expected to reduce construction costs. Furthermore, the fluidity improvement unit 24 improves the fluidity of the powdered dry ice, allowing for quick and smooth discharge from the storage body. This reduces the time required for discharge and transportation, significantly shortening the lead time throughout the entire value chain 1.

[0028] According to the above configuration, the fluidity of the powdered dry ice is improved by causing the carrier gas to accompany the powdered dry ice in the solid transport line 31. This allows the powdered dry ice to be injected from the solid transport line 31 into the storage body 21 more quickly and smoothly.

[0029] According to the above configuration, by supplying a stirring gas, the gaps between the particles of powdered dry ice become larger, and the fluidity of the powdered dry ice can be easily improved.

[0030] According to the above configuration, the vaporized components generated by the vaporization of powdered dry ice are extracted by the extraction unit 41 and used as the stirring gas in the fluidity improvement unit 24. This allows the vaporized components to be effectively utilized without being dispersed to the outside, thereby significantly reducing the operating and maintenance costs of the system.

[0031] The first embodiment of the present disclosure has been described above. Note that various changes and modifications can be made to the above configurations without departing from the spirit and scope of the present disclosure.

[0032] For example, in the first embodiment, an example was described in which powdered dry ice is produced in advance in the dry ice generation device 15, and then supplied and stored in the dry ice storage unit 16. However, as a modified example, it is also possible to employ a configuration in which liquefied carbon dioxide is directly supplied from the liquefaction device 13 to the dry ice storage unit 16, as shown in FIG.

[0033] That is, in this modification, the supply unit 22 has a liquid transport line 51 that transports liquefied carbon dioxide from the liquefaction device 13. The configuration of the injection nozzle 34 (nozzle portion) is the same as that described above. When the injection nozzle 34 injects liquefied carbon dioxide into the storage unit main body 21, the pressure of the carbon dioxide drops suddenly, causing adiabatic expansion. This makes it possible to directly obtain powdered dry ice from the liquefied carbon dioxide.

[0034] According to the above configuration, powdered dry ice can be directly generated and stored within storage body 21 by adiabatic expansion caused by simply spraying liquefied carbon dioxide from the nozzle. This eliminates the need to install an external dry ice production device, making it possible to reduce the construction and maintenance costs of the entire system.

[0035] Furthermore, in order to further improve the fluidity of the powdered dry ice, a coating layer may be provided on the inner surface (particularly the bottom surface) of the above-mentioned storage body 21. A material with good slipperiness, such as fluororesin, is preferably used as the coating layer. The coating layer desirably has an appropriate hardness to suppress wear due to the movement of the powdered dry ice. Alternatively, as an alternative to a coating layer, the inner surface of the storage body 21 may be polished or modified to ensure slipperiness. This is advantageous in that peeling of the coating layer due to thermal expansion or the like can be prevented.

[0036] According to the above configuration, the coating layer is provided on the inner surface of the storage body 21, which reduces frictional resistance between the solid powdered dry ice and the coating layer. This improves the fluidity of the powdered dry ice when it is discharged, making it easier and faster to discharge the powdered dry ice.

[0037] In addition, instead of simply making the bottom of storage body 21 flat, it is also possible to make it conical or have an inclined surface, which allows powdered dry ice to be discharged more quickly and smoothly.

[0038] Second Embodiment Next, a vessel 18 according to a second embodiment of the present disclosure will be described with reference to Figures 5 and 6. Note that the same components as those in the first embodiment will be denoted by the same reference numerals, and detailed description thereof will be omitted.

[0039] The ship 18 is one of the means of transporting carbon dioxide in the value chain 1 described in the first embodiment. Powdered dry ice is loaded onto the ship 18 from the dry ice storage unit 16 using a loading arm 17. As shown in FIG. 5 , the ship 18 includes a hull 60 and a dry ice storage unit 116.

[0040] Although not shown in detail, the hull 60 has a streamlined shape extending from bow to stern along the direction of travel, and is provided with multiple or a single hold 61 in the middle, a bridge for the crew, etc. A propeller is provided at the stern as a propulsion device.

[0041] The dry ice storage unit 116 is provided in the hold 61. In addition to the components described above, the dry ice storage unit 116 further includes an outer shell 25 that covers the storage unit main body 21 from the outside. A space is formed between the outer shell 25 and the outer surface of the storage unit main body 21. This space is called the "insulated space V."

[0042] Furthermore, among the components of the dry ice storage unit 116, the fluidity improving unit 124 has a different configuration from that described in the first embodiment. Specifically, the fluidity improving unit 124 is configured so that the vaporized component extracted by the extraction unit 141 is supplied into the above-mentioned thermally insulated space V. In other words, by filling the thermally insulated space V with vaporized low-temperature carbon dioxide, the carbon dioxide functions as a thermal insulator. This makes it possible to minimize the exchange of heat between the storage unit main body 21 and the outside.

[0043] Furthermore, in the fluidity improving section 124, the vaporized components stored in this thermally insulated space V can be used as the stirring gas. When discharging the powdered dry ice, the stirring gas stirs the powdered dry ice in the storage section main body 21 through a stirring gas nozzle 145 provided at the bottom of the storage section main body 21 (see FIG. 6). The stirred powdered dry ice, with its fluidity increased, is carried out to the outside through a carry-out line 70 serving as the carry-out section 123. A carry-out pump 71 is provided on the carry-out line 70 to pressure-feed the powdered dry ice and the stirring gas. In other words, the stirring gas also serves as the carrier gas described above.

[0044] (Action and effect) According to the above configuration, carbon dioxide can be transported by sea in the form of powdered dry ice by using the ship 18 equipped with the dry ice storage unit 116. This allows for lower transportation costs.

[0045] According to the above configuration, the vaporized components produced by the evaporation of powdered dry ice are supplied into the insulated space V. This suppresses the exchange of heat between the outside of the outer shell 25 and the inside of the storage body 21. This makes it possible to stably maintain the powdered dry ice at a low temperature within the storage body 21. As a result, the ship 18 can be used for long-term marine transportation. Furthermore, since the dry ice storage unit 116 can be easily applied to a general bulk cargo ship, there is no need to prepare a dedicated ship. This further contributes to reducing transportation costs.

[0046] Furthermore, the vaporized components of the powdered dry ice extracted by the extraction unit 141 are used as carrier gas and agitation gas. This allows for more effective use of the vaporized components. This further reduces the possibility of carbon dioxide loss within the value chain 1. In addition, the overall plant size can be reduced.

[0047] (Other embodiments) The above describes in detail the embodiments of the present disclosure with reference to the drawings, but the specific configuration is not limited to this embodiment, and design changes and the like are also included within the scope that does not deviate from the gist of the present disclosure.

[0048] For example, a configuration shown in FIG. 7 can be employed as a variation of the second embodiment. In the example shown in FIG. 7, a heating unit 80 serving as a fluidity improving unit 224 is provided at the bottom of the storage unit body 21. The heating unit 80 is, for example, an electric heater or a heat pump, and is capable of raising the temperature within the storage unit body 21. As the temperature within the storage unit body 21 rises, the powdered dry ice gradually vaporizes. In other words, the dry ice attains a state in which its fluidity is significantly enhanced compared to its solid state. This vaporized carbon dioxide is appropriately extracted from the storage unit body 21 and used for various purposes. This makes it possible to transport and transport carbon dioxide more easily and inexpensively. In particular, when a heat pump is used, the cold energy of the dry ice obtained by the heating unit 80 can be effectively utilized, thereby further reducing operating costs.

[0049] In the second embodiment, an example was described in which the outer shell 25 covers the outside of the storage body 21 to form the insulating space V, and the vaporized carbon dioxide component is supplied to this space. However, the insulating space V does not necessarily have to be formed by the outer shell 25. As another example, it is also possible to adopt a configuration in which pipes are laid on the outer surface of the storage body 21 and the vaporized component is guided to these pipes to ensure insulating performance. Furthermore, the gas filled in the insulating space V does not necessarily have to be carbon dioxide; other gases or insulating materials such as glass wool can also be used. In this case, it is desirable that the carbon dioxide be stored in a separately provided buffer tank.

[0050] As the fluidity improving section 24, in addition to the configurations explained in the above embodiments, it is also possible to use a stirring blade or a vibrating device.

[0051] <Additional Notes> The dry ice storage unit 16 and the ship 18 described in each embodiment can be understood, for example, as follows.

[0052] (1) The dry ice storage unit 16 of the first embodiment comprises a storage main body 21, a supply unit 22 capable of supplying powdered dry ice into the storage main body 21, an unloading unit 23 capable of unloading the powdered dry ice from the storage main body 21, and a fluidity improving unit 24 that improves the fluidity of the powdered dry ice in the storage main body 21.

[0053] According to the above configuration, carbon dioxide can be stored at normal pressure in powdered dry ice, i.e., in a solid state, in storage body 21. This increases the amount of carbon dioxide stored per unit volume and eliminates the need to pressurize storage body 21, thereby reducing management and transportation costs.

[0054] (2) The dry ice storage unit 16 of the second aspect is the dry ice storage unit 16 of (1), and the supply unit 22 has a solid conveying line 31 that conveys the powdered dry ice that has been generated in advance outside, and a gas supply unit 32 that supplies a conveying gas into the solid conveying line 31.

[0055] According to the above configuration, by causing the carrier gas to accompany the powdered dry ice in the solid transport line 31, the fluidity of the powdered dry ice is improved.

[0056] (3) The dry ice storage unit 16 of the third aspect is the dry ice storage unit 16 of (1), wherein the supply unit 22 has a liquid transport line 51 that transports liquefied carbon dioxide and a nozzle unit that is provided within the storage unit main body 21 and that generates the powdered dry ice by adiabatic expansion by injecting the liquefied carbon dioxide into the storage unit main body 21.

[0057] According to the above configuration, powdered dry ice can be directly generated and stored within storage body 21 by simply spraying liquefied carbon dioxide from the nozzle portion, which causes adiabatic expansion.

[0058] (4) The dry ice storage unit 16 of the fourth aspect is the dry ice storage unit 16 of any one of the aspects (1) to (3), and the fluidity improving unit 24 improves the fluidity of the powdered dry ice by supplying a stirring gas to the powdered dry ice in the storage unit main body 21.

[0059] According to the above configuration, by supplying a stirring gas, the gaps between the particles of powdered dry ice become larger, and the fluidity of the powdered dry ice can be easily improved.

[0060] (5) The dry ice storage unit 16 according to the fifth aspect is the dry ice storage unit 16 of (4), further comprising an extraction unit 41 that extracts vaporized components produced by the vaporization of the powdered dry ice in the storage unit main body 21, and the fluidity improvement unit 24 uses the vaporized components as the stirring gas.

[0061] According to the above configuration, the vaporized components can be effectively utilized without being dispersed to the outside.

[0062] (6) The dry ice storage section 116 of the sixth aspect is the dry ice storage section 116 of any one of the aspects (1) to (5), and the fluidity improvement section 224 has a heating section 80 that can raise the temperature inside the storage section main body 21.

[0063] According to the above configuration, powdered dry ice is vaporized by increasing the temperature inside storage body 21 using heating unit 80. This improves the fluidity of the dry ice as carbon dioxide, making it easier to discharge to the outside.

[0064] (7) The dry ice storage section 16 of the seventh aspect is a dry ice storage section 16 of any one of the aspects (1) to (6), in which the fluidity improving section 24 is provided on the inner surface of the storage section main body 21 and has a coating layer that improves slipperiness.

[0065] According to the above configuration, the fluidity of the powdered dry ice when it is discharged is improved, making it possible to discharge the powdered dry ice more easily and in a shorter time.

[0066] (8) A ship 18 according to an eighth aspect includes a dry ice storage unit 116 according to any one of the aspects (1) to (7) and a hull 60 that houses the dry ice storage unit 116.

[0067] According to the above configuration, it is possible to reduce transportation costs.

[0068] (9) The ship 18 of the ninth aspect is the ship 18 of (8), further comprising an outer shell 25 that forms an insulated space V that covers the outside of the storage section main body 21, and an extraction section 141 that extracts vaporized components produced by the evaporation of the powdered dry ice in the storage section main body 21, and the extraction section 141 supplies the vaporized components into the insulated space V.

[0069] According to the above configuration, it is possible to stably maintain the powdered dry ice in storage body 21 at a low temperature. [Explanation of symbols]

[0070] 1...Value chain 11...CO2 capture device 12...Gas tank 13...Liquidation device 14...Pre-cooling device 15...Dry ice generation device 16...Dry ice storage section 17...Loading arm 18...Vessel 19...Vapor component recovery section 21...Storage section main body 22...Supply section 23...Discharge section 24...Fluidity improvement section 25...Outer hull 31...Solid transport line 32...Gas supply section 33...Supply pump 34...Injection nozzle 41...Extraction section 42...Mixing gas line 43...Mixing gas tank 44...Blower 45...Mixing gas nozzle 46...Branch line 51...Liquid transport line 60...Hull 61...Hold 70...Discharge line 71...Discharge pump 80...Heating section 116...Dry ice storage section 123...Discharge section 124...Fluidity improvement section 141...Extraction section 145...Agitation gas nozzle 224...Fluidity improving section V...Insulated space

Claims

1. a reservoir body; A supply unit capable of supplying powdered dry ice into the storage unit main body; A discharge unit capable of discharging the powdered dry ice from the storage unit main body; A fluidity improving section that improves the fluidity of the powdered dry ice in the storage section main body; A dry ice reservoir comprising:

2. The supply unit includes: a solid transport line for transporting the powdered dry ice previously produced outside; a gas supply unit that supplies a carrier gas into the solid transport line; 2. The dry ice reservoir of claim 1, comprising:

3. The supply unit includes: a liquid transport line for transporting liquefied carbon dioxide; a nozzle portion provided in the storage body and configured to generate the powdered dry ice by adiabatic expansion by injecting the liquefied carbon dioxide into the storage body; 2. The dry ice reservoir of claim 1, comprising:

4. The fluidity improving section is 4. The dry ice storage unit according to claim 1, wherein the fluidity of the powdered dry ice is improved by supplying a stirring gas to the powdered dry ice in the storage unit main body.

5. Further provided is an extraction unit that extracts vaporized components produced by vaporizing the powdered dry ice in the storage unit main body, The dry ice storage unit according to claim 4 , wherein the fluidity improving unit uses the vaporized component as the stirring gas.

6. The dry ice storage unit according to claim 1 , wherein the fluidity improving unit has a heating unit capable of increasing the temperature inside the storage unit main body.

7. The fluidity improving section is 4. A dry ice storage unit as described in any one of claims 1 to 3, having a coating layer provided on the inner surface of the storage unit body to improve slipperiness.

8. The dry ice storage unit according to any one of claims 1 to 3, a hull that accommodates the dry ice storage unit; A vessel equipped with:

9. An outer shell that forms a heat insulating space that covers the outside of the storage body; An extraction unit that extracts vaporized components generated by vaporization of the powdered dry ice in the storage unit main body; Furthermore, The vessel according to claim 8 , wherein the extraction unit supplies the vaporized component into the thermally insulated space.

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