Hatch structure and ship for reducing supercritical carbon dioxide discharge heat loss

Abstract

The application relates to the ship technology field and discloses a liquid tank structure for reducing supercritical carbon dioxide drainage heat loss and a ship. The liquid tank structure comprises a liquid tank, a partition plate, a first exhaust valve, a first drainage valve and a first air inlet pipe. The liquid tank has a first top wall and a first bottom wall arranged oppositely. The partition plate is connected to the first top wall and extends towards the first bottom wall to divide the containing chamber into a first containing space and a second containing space. The first air inlet pipe extends into the second containing space and is used for charging the second containing space with supercritical carbon dioxide. The partition plate is arranged at intervals from the first bottom wall to form a first opening connecting the first containing space and the second containing space. A plurality of first holes are arranged on the partition plate and penetrate the partition plate along the thickness direction of the partition plate. The technical problem that the contact area between supercritical carbon dioxide and the inner wall of the liquid tank and the water surface is large, heat exchange loss is large, the volume is prone to shrinkage and drainage efficiency is reduced is solved.

Description

Technical Field

[0001] This application relates to the field of marine technology, and in particular to a liquid tank structure and a ship for reducing heat loss from supercritical carbon dioxide discharge. Background Technology

[0002] With the continuous development of ocean navigation, ships have become key equipment for studying the deep-sea environment, developing marine resources, and conducting scientific research. When ships are sailing at sea, they need to drain their liquid tanks. Among related technologies, liquid carbon dioxide can be rapidly transformed into a supercritical state after being heated and pressurized, expanding in volume several times over and exhibiting strong work capacity, effectively draining water from the tanks. However, during the drainage process of supercritical carbon dioxide in the tank structure, the large contact area between the carbon dioxide and the inner wall of the tank and the water surface results in significant heat exchange losses and easy volume contraction, leading to reduced drainage efficiency. Summary of the Invention

[0003] This application provides a liquid tank structure and ship for reducing heat loss during supercritical carbon dioxide drainage. It solves the technical problem that during the drainage process of supercritical carbon dioxide in the liquid tank structure, the large contact area between carbon dioxide and the inner wall of the liquid tank and the water surface leads to large heat exchange loss and easy volume shrinkage, resulting in reduced drainage efficiency.

[0004] To achieve the above objectives, the main technical solutions adopted in this application include:

[0005] In a first aspect, embodiments of this application provide a liquid tank structure for reducing heat loss from supercritical carbon dioxide drainage. The liquid tank structure includes a liquid tank, a partition, a first vent valve, a first drain valve, and a first air inlet pipe. The liquid tank has a receiving chamber, and in the vertical direction, the liquid tank has a first top wall and a first bottom wall disposed opposite to each other. The partition is disposed in the receiving chamber, connected to the first top wall and extending toward the first bottom wall, to divide the receiving chamber into a first receiving space and a second receiving space. The first vent valve is disposed in the first top wall and can selectively connect to the first receiving space. The first drain valve is disposed in the first bottom wall and can selectively connect to the receiving chamber. The first air inlet pipe extends into the second receiving space and is used to fill the second receiving space with supercritical carbon dioxide. The partition and the first bottom wall are spaced apart to form a first opening connecting the first receiving space and the second receiving space. The partition is provided with a plurality of first holes, which penetrate the partition along the thickness direction.

[0006] The liquid tank structure proposed in this application embodiment has a partition disposed in the receiving chamber of the liquid tank. The partition is spaced apart from the first bottom wall to form a first opening connecting the first receiving space and the second receiving space. This can reduce the contact area between carbon dioxide and the liquid in the liquid tank, reduce the cooling area of ​​carbon dioxide, reduce the shrinkage volume of carbon dioxide, and improve the drainage capacity of the liquid tank structure. The partition is provided with multiple first holes that penetrate the partition along the thickness direction. This allows carbon dioxide in the second receiving space to enter the first receiving space during the process of water entering the liquid tank, thereby improving the water intake efficiency of the liquid tank.

[0007] Optionally, the partition is provided with a plurality of first hole groups, which are spaced apart along a first direction. Each first hole group includes a plurality of first holes spaced apart along a vertical direction. The first direction, the thickness direction of the partition, and the vertical direction are perpendicular to each other. The plurality of first hole groups include adjacent first sub-hole groups and second sub-hole groups. Along the first direction, any first hole in the first sub-hole group is positioned opposite to the corresponding first hole in the second sub-hole group.

[0008] Multiple first hole groups include adjacent first sub-hole groups and second sub-hole groups. Along the first direction, any first hole in the first sub-hole group is arranged opposite to the corresponding first hole in the second sub-hole group. This allows carbon dioxide in the second containment space to flow more smoothly and evenly into the first containment space, improving the liquid tank filling efficiency and enhancing the stability and reliability of liquid tank filling.

[0009] Optionally, along the first direction, the distance between two adjacent first holes is A, and along the vertical direction, the distance between two adjacent first holes is B, satisfying: 5mm≤A≤10mm, 5mm≤B≤10mm.

[0010] This ensures that there are a sufficient number of first holes on the partition, so that when the liquid tank is flooded, the carbon dioxide in the second containment space can be fully discharged into the first containment space. On the other hand, the distance between two adjacent first holes must be controlled within a reasonable range to avoid the first holes being too close together, which would cause a significant decrease in the structural strength of the partition and affect its use.

[0011] Optionally, the diameter of the first hole is C, which satisfies: 1mm≤C≤5mm.

[0012] On the one hand, during the drainage process, a small amount of liquid will flow from the first containment space into the second containment space through the first hole. Moreover, as the drainage process proceeds, the vertical height of the liquid in the first containment space will decrease, and carbon dioxide in the second containment space will leak partially into the first containment space through the first hole. By ensuring that 1mm≤C≤5mm, the amount of carbon dioxide flowing from the second containment space into the first containment space can be minimized, thereby improving the drainage capacity of the liquid tank and reducing the contact area between carbon dioxide and the liquid surface. On the other hand, when the liquid tank is filled with water, the orifice diameter C of the first hole satisfies 1mm≤C≤5mm. This ensures that the orifice diameter of the first hole is not too small, and the carbon dioxide in the second containment space can be uniformly and stably discharged into the first containment space, thereby improving the water intake efficiency of the liquid tank.

[0013] Optionally, along the thickness direction of the partition, the sum of the projected areas of the multiple first holes is D1, and the minimum exhaust cross-sectional area of ​​the first exhaust valve is D2, satisfying: D2≥D1.

[0014] This ensures that the venting capacity of the first vent valve is at least equal to the carbon dioxide flow capacity achievable through the first hole in the partition. This guarantees that when water is introduced into the liquid tank and carbon dioxide is released, the carbon dioxide in the second containment space can be discharged from the first vent valve at a relatively fast rate, preventing gas accumulation in the second containment space and avoiding excessive pressure. This ensures the safe and stable operation of the liquid tank and improves the stability and reliability of the liquid tank structure.

[0015] Optionally, along the thickness direction of the partition, the first hole has a second opening and a third opening, the size of the second opening is larger than the size of the third opening, the second opening faces the second receiving space, and the third opening faces the first receiving space.

[0016] The diameter of the third opening is smaller than that of the second opening, which makes the first hole form a funnel-like shape, which can guide the carbon dioxide in the second containment space to flow into the first containment space. When the liquid tank is filled with water, the pressure in the second containment space increases, and the carbon dioxide in the second containment space can enter the first hole more smoothly through the larger second opening, and then enter the first containment space through the third opening.

[0017] Optionally, the size of the first hole gradually increases along the thickness direction of the partition and away from the first receiving space.

[0018] The uniform variation in the size of the first hole can reduce stress concentration in the baffle. Because the pressure change around the first hole is relatively gradual, the stress distribution on the baffle is more uniform, reducing the risk of damage or deformation of the baffle due to excessive local stress, extending the service life of the baffle, and ensuring the long-term stable operation of the liquid tank structure.

[0019] Optionally, the volume of the first accommodating space is larger than the volume of the second accommodating space.

[0020] In this way, the carbon dioxide enters the second containment space directly. Compared to entering the first containment space directly, the combined contact area between the carbon dioxide and the liquid, the contact area with the inner wall of the liquid tank, and the contact area with the partition in the second containment space, which is the cooling area of ​​the carbon dioxide, is greater than the cooling area of ​​the carbon dioxide in the first containment space. This can reduce the degree of cooling and contraction of the carbon dioxide and allow more water to be discharged from the liquid tank.

[0021] Optionally, a sealing element is provided on the partition, which is movably disposed on the partition to block or open at least part of the first hole.

[0022] When the liquid tank needs to be drained, the sealing component moves on the partition, thereby blocking the first hole and allowing carbon dioxide to be discharged into the second containment space. The carbon dioxide in the second containment space cannot leak from the first hole into the first containment space, reducing the leakage of carbon dioxide volume and improving the drainage capacity of the liquid tank structure.

[0023] Optionally, the sealing component is constructed as a plurality of first plates stacked along the thickness direction of the partition. In the vertical direction, the plurality of stacked first plates are movably disposed on the partition. When the first air inlet pipe is inflated, the plurality of stacked first plates are laid flat on the partition to block the plurality of first holes. Along the thickness of the partition, the projections of the plurality of first plates do not overlap.

[0024] When the liquid tank needs to be drained, multiple stacked first plates are laid flat on the partition, thereby sealing multiple first holes. The first air inlet pipe inflates the second containment space. Carbon dioxide in the second containment space will not enter the first containment space through the first holes, reducing the chance of carbon dioxide leakage and ensuring the pressure in the second containment space. Moreover, liquid in the first containment space will not enter the second containment space through the first holes, reducing the heat exchange area of ​​carbon dioxide in the second containment space and improving the drainage capacity of the liquid tank structure.

[0025] Optionally, along the vertical direction, the partition has a first end and a second end that are arranged opposite to each other. The first end is connected to the first top wall, and the second end faces the first bottom wall. The distance between the second end and the first bottom wall is E1. Along the first direction, the length of the partition is E2. The first direction, the thickness direction of the partition, and the vertical direction are all perpendicular to each other. Along the first direction, the minimum cross-sectional area of ​​the second accommodating space is D3, and the minimum cross-sectional area of ​​the first drain valve is D4, satisfying: E1*E2>D4, D3>D4.

[0026] This ensures that the water in the tank can be discharged quickly and stably, preventing the rate of carbon dioxide discharge from exceeding the rate of water discharge. It also prevents excessive carbon dioxide in the tank, which could lead to excessive pressure and extend the tank's service life.

[0027] Optionally, the size of the partition can be adjusted in the vertical direction.

[0028] The size of the partition is adjustable in the vertical direction, which means that the size of the first opening is adjustable. This allows the size of the first opening to be adjusted according to the actual drainage needs of the liquid tank structure, expanding the adjustment range of the first size, improving drainage efficiency, expanding the scope of use of the liquid tank structure, and expanding the application scenarios of the liquid tank structure.

[0029] Optionally, the liquid tank structure also includes a heating sheet attached to the first top wall and located in the second accommodating space.

[0030] When carbon dioxide is filled into the second containment space, the heating sheet can heat the carbon dioxide in the second containment space, causing the carbon dioxide to expand due to heat, or in other words, keeping the temperature of the carbon dioxide from dropping, reducing the probability of the carbon dioxide contracting when it cools down, and improving the stability and reliability of the liquid tank structure.

[0031] Secondly, embodiments of this application also propose a ship including a liquid tank structure according to any one of the embodiments of this application.

[0032] The ship proposed in this application embodiment has a bulkhead disposed in the receiving chamber of the liquid tank. The bulkhead is spaced apart from the first bottom wall to form a first opening connecting the first receiving space and the second receiving space. This can reduce the contact area between carbon dioxide and the liquid in the liquid tank, reduce the cooling area of ​​carbon dioxide, reduce the shrinkage volume of carbon dioxide, and improve the drainage capacity of the liquid tank structure. The bulkhead is provided with multiple first holes that penetrate the bulkhead along the thickness direction. In this way, during the process of water entering the liquid tank, carbon dioxide in the second receiving space can enter the first receiving space, thereby improving the water intake efficiency of the liquid tank. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0034] Figure 1 This is a schematic diagram of the liquid tank structure provided in the embodiments of this application;

[0035] Figure 2 This is a schematic diagram of a liquid tank structure provided in an embodiment of this application, but without liquid.

[0036] Figure 3 This is a schematic diagram of the structure of the partition provided in the embodiments of this application;

[0037] Figure 4 The structure of the first hole is shown;

[0038] Figure 5 This is a structural schematic diagram of a ship provided in an embodiment of this application.

[0039] [Explanation of Labels in the Attached Image]

[0040] Liquid tank structure 1000; Ship 2000;

[0041] Liquid tank 100; containment chamber 110; first top wall 120; first bottom wall 130; first containment space 140; second containment space 150; first opening 160;

[0042] Partition 200; First hole 210; Second opening 211; Third opening 212; First end 220; Second end 230;

[0043] First exhaust valve 300;

[0044] First drain valve 400;

[0045] First air intake pipe 500;

[0046] 600 sealing component; 610 first plate;

[0047] Heating sheet 700;

[0048] First liquid medium 800;

[0049] First gas medium 900;

[0050] The thickness of the partition is in the X direction; the first direction is Y; and the vertical direction is Z. Detailed Implementation

[0051] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0052] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0053] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0054] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0055] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0056] In this application, "multiple" refers to two or more (including two), and similarly, "multiple groups" refers to two or more (including two), and "multiple pieces" refers to two or more (including two).

[0057] With the continuous development of ocean navigation, ships have become key equipment for studying the deep-sea environment, developing marine resources, and conducting scientific research. When ships are sailing in the ocean, ballast tanks (liquid tanks) effectively control the ship's draft, stability, and trim by adjusting the internal water volume, ensuring that the ship can sail safely and stably in different cargo loads and sea conditions.

[0058] In related technologies, supercritical carbon dioxide can be used for drainage in liquid tank structures. Carbon dioxide is liquid at certain pressure and temperature, has a high density, and is easy to store. Liquid carbon dioxide can rapidly transform into a supercritical state after being heated and pressurized, expanding its volume several times. It has strong work capacity and is non-toxic and pollution-free, effectively draining water from the liquid tank. However, during the drainage process in the liquid tank structure, the contact area between carbon dioxide and the inner wall of the liquid tank and the water surface is large, resulting in significant heat exchange losses and easy volume contraction, leading to reduced drainage efficiency.

[0059] In view of this, embodiments of this application propose a liquid tank structure and a ship for reducing heat loss from supercritical carbon dioxide drainage. The liquid tank structure includes a liquid tank, a bulkhead, a first vent valve, a first drain valve, and a first air inlet pipe. The liquid tank has a receiving chamber, and in the vertical direction, the liquid tank has a first top wall and a first bottom wall disposed opposite to each other. The bulkhead is disposed in the receiving chamber, connected to the first top wall and extending toward the first bottom wall, to divide the receiving chamber into a first receiving space and a second receiving space. The first vent valve is disposed in the first top wall and can selectively connect to the first receiving space. The first drain valve is disposed in the first bottom wall and can selectively connect to the receiving chamber. The first air inlet pipe extends into the second receiving space and is used to fill the second receiving space with supercritical carbon dioxide. The bulkhead and the first bottom wall are spaced apart to form a first opening connecting the first receiving space and the second receiving space. The bulkhead is provided with a plurality of first holes, which penetrate the bulkhead along the thickness direction.

[0060] In the above-mentioned solution, the liquid tank structure proposed in this application embodiment has a partition disposed in the receiving chamber of the liquid tank. The partition is spaced apart from the first bottom wall to form a first opening connecting the first receiving space and the second receiving space. This can reduce the contact area between carbon dioxide and the liquid in the liquid tank, reduce the cooling area of ​​carbon dioxide, reduce the shrinkage volume of carbon dioxide, and improve the drainage capacity of the liquid tank structure. The partition is provided with multiple first holes, which penetrate the partition along the thickness direction. In this way, during the process of water entering the liquid tank, carbon dioxide in the second receiving space can enter the first receiving space, thereby improving the water intake efficiency of the liquid tank.

[0061] For ease of explanation, the following embodiments use a liquid tank structure for reducing heat loss from supercritical carbon dioxide drainage as an example.

[0062] Figure 1 This is a schematic diagram of the liquid tank structure provided in the embodiments of this application; Figure 2 This is a schematic diagram of a liquid tank structure provided in an embodiment of this application, but without liquid. Figure 3 This is a schematic diagram of the structure of the partition provided in the embodiments of this application; Figure 4 The structure of the first hole is shown; Figure 5This is a structural schematic diagram of a ship provided in an embodiment of this application.

[0063] Please refer to Figures 1 to 5 A liquid tank structure 1000 for reducing heat loss from supercritical carbon dioxide drainage includes a liquid tank 100, a partition 200, a first exhaust valve 300, a first drain valve 400, and a first air inlet pipe 500. The liquid tank 100 has a receiving chamber 110 extending vertically in the Z direction. The liquid tank 100 has a first top wall 120 and a first bottom wall 130 disposed opposite to each other. The partition 200 is disposed in the receiving chamber 110, connected to the first top wall 120, and extends toward the first bottom wall 130 to divide the receiving chamber 110 into a first receiving space 140 and a second receiving space 150. The first exhaust valve 300 is disposed on the first top wall 120. The first exhaust valve 300 can selectively connect to the first receiving space 140, and the first drain valve 400 is disposed on the first bottom wall 130. The first drain valve 400 can selectively connect to the receiving chamber 110. The first air inlet pipe 500 extends into the second receiving space 150 and is used to fill the second receiving space 150 with supercritical carbon dioxide. The partition 200 is spaced apart from the first bottom wall 130 to form a first opening 160 connecting the first receiving space 140 and the second receiving space 150. The partition 200 is provided with a plurality of first holes 210, which penetrate the partition 200 along the thickness direction X.

[0064] The liquid tank 100 has a receiving chamber 110 for storing water or other liquids. Along the vertical direction Z, the liquid tank structure 1000 has a first top wall 120 and a first bottom wall 130 disposed opposite each other. A partition 200 is disposed on the first top wall 120 and located in the receiving chamber 110. The partition 200 extends toward the first bottom wall 130 and can divide the receiving chamber 110 into a first receiving space 140 and a second receiving space 150.

[0065] A first drain valve 400 is disposed on the first bottom wall 130. As its name suggests, the first drain valve 400 is used to drain water from the liquid tank 100. The first drain valve 400 can not only drain water from the liquid tank 100 through the receiving chamber 110, but also divert external water into the receiving chamber 110. For example, the liquid tank 100 can be used to control the draft of the ship 2000. When the ship 2000 needs a larger draft, water can enter the receiving chamber 110 of the liquid tank 100 through the first drain valve 400, thereby increasing the overall weight of the liquid tank 100. When the ship 2000 needs a smaller draft, the water in the receiving chamber 110 of the liquid tank 100 can be drained from the receiving chamber 110, thereby reducing the overall weight of the liquid tank 100 and thus reducing the draft of the ship 2000.

[0066] The first exhaust valve 300 is disposed on the first top wall 120. The first exhaust valve 300 can be selectively connected to the first receiving space 140. The first exhaust valve 300 can be connected to the first receiving space 140 or not connected to the first receiving space 140. The gas in the first receiving space 140 can exit the first receiving space 140 through the first exhaust valve 300. When water enters the receiving chamber 110 of the liquid tank 100 from the first drain valve 400, the water will squeeze the gas in the first receiving space 140, thereby causing the gas in the first receiving space 140 to be discharged from the first receiving space 140 through the first exhaust valve 300.

[0067] The first air inlet pipe 500 extends into the second receiving space 150. The first air inlet pipe 500 is used to inflate the second receiving space 150. For example, one end of the first air inlet pipe 500 extends into the second receiving space 150, and the other end of the first air inlet pipe 500 is connected to a carbon dioxide phase change device. The carbon dioxide phase change device stores liquid carbon dioxide. When the liquid carbon dioxide is heated or excited, it becomes supercritical carbon dioxide and enters the first air inlet pipe 500. The supercritical carbon dioxide then enters the second receiving space 150 and squeezes the liquid in the second receiving space 150, causing the liquid in the second receiving space 150 to be discharged from the drain valve.

[0068] A partition 200 is disposed on the first top wall 120, and the partition 200 is spaced apart from the first bottom wall 130. The first opening 160 is located between the partition 200 and the first bottom wall 130. The first receiving space 140 and the second receiving space 150 are mainly connected through the first opening 160. For example, liquid or gas in the first receiving space 140 can flow into the second receiving space 150 through the first opening 160, and liquid or gas in the second receiving space 150 can flow into the first receiving space 140 through the first opening 160.

[0069] A plurality of first holes 210 are provided on the partition 200. These first holes 210 are evenly arranged on the partition 200 and extend through it along the thickness direction X. For example, when the liquid tank 100 is full of water, supercritical gaseous carbon dioxide is introduced into the second containment space 150, causing the liquid in the liquid tank 100 to drain through the first drain valve 400. A partition 200 is provided between the first containment space 140 and the second containment space 150. For example, the size of the first holes 210 can be on the millimeter level. When carbon dioxide is introduced into the second containment space 150, the liquid in the second containment space 150 gradually decreases and is drained through the first drain valve 400. The liquid in the first containment space 140 gradually decreases. The carbon dioxide has a certain pressure in the first containment space 140. Since the size of the first holes 210 is on the millimeter level, the pressure of the carbon dioxide is sufficient to prevent the liquid in the first containment space 140 from flowing into the second containment space 150 through the first holes 210. The liquid discharged into the second containment space 150 through the first hole 210 is negligible compared to the filling speed of carbon dioxide, which is the drainage speed of the first drain valve 400 of the liquid tank 100. The first opening 160 connects the first containment space 140 and the second containment space 150. When the liquid in the second containment space 150 gradually decreases to the junction of the first opening 160 and the partition 200, the liquid in the first containment space 140 can enter the second containment space 150 through the first opening 160. Carbon dioxide is continuously discharged into the first containment space 140 until the liquid depth in the first containment space 140 and the liquid in the second containment space 150 in the vertical direction Z is the same. That is to say, the liquid in the first containment space 140 and the second containment space 150 are both flush with the size of the first opening 160. Carbon dioxide continues to be discharged. At this time, the carbon dioxide in the second containment space 150 will mainly flow into the first containment space 140 from the first opening 160, thereby continuing to complete the liquid drainage operation in the containment chamber 110 of the liquid tank 100.

[0070] Compared to when the liquid tank 100 is not equipped with a baffle 200, carbon dioxide will be directly discharged into the containment chamber 110. With the first exhaust valve 300 closed and the first drain valve 400 open, carbon dioxide directly contacts the first top wall 120, side walls, and the surface of the liquid in the liquid tank 100 facing the first top wall 120. At this time, the carbon dioxide has a large contact area with the liquid surface, and the carbon dioxide is prone to volume shrinkage, reducing the drainage efficiency.

[0071] When a certain volume of carbon dioxide passes through, 15.8 cubic meters of water can be drained with a baffle 200 inside the liquid tank 100. Without a baffle 200 inside the liquid tank 100, only 13.6 cubic meters of water can be drained due to the contraction of the carbon dioxide. Obviously, having a baffle 200 inside the liquid tank 100 can greatly improve the drainage efficiency of the liquid tank 100.

[0072] After the liquid tank 100 is drained, it contains a large amount of carbon dioxide. When the liquid tank 100 needs to be filled with water, a large amount of liquid is injected into the liquid tank 100 through the first drain valve 400. Along the vertical direction Z, the liquid gradually rises from the first bottom wall 130 to the first top wall 120. During the rise of the liquid, the first vent valve 300 is open, and the carbon dioxide will be discharged from the first vent valve 300 into the receiving chamber 110. When the liquid continues to rise to the first opening 160 and is higher than the first opening 160, that is, when the liquid rises to the partition 200, the carbon dioxide in the second receiving chamber can flow into the first receiving chamber 110 through the multiple first holes 210 provided on the partition 200. The vent valve provided in the first receiving chamber 110 can discharge all the carbon dioxide from the liquid tank 100. The multiple first holes 210 provided on the partition 200 can discharge all the gas in the liquid tank 100 when the liquid tank 100 is filled with water, thus improving the water intake efficiency of the liquid tank 100.

[0073] Specifically, a partition 200 is disposed in the receiving chamber 110 of the liquid tank 100. The partition 200 is spaced apart from the first bottom wall 130 to form a first opening 160 connecting the first receiving space 140 and the second receiving space 150. This reduces the contact area between carbon dioxide and the liquid in the liquid tank 100, reduces the cooling area of ​​gaseous carbon dioxide, reduces the shrinkage volume of carbon dioxide, and improves the drainage capacity of the liquid tank structure 1000. The partition 200 is provided with a plurality of first holes 210. Along the thickness direction X of the partition, the plurality of first holes 210 penetrate the partition 200. In this way, during the process of water entering the liquid tank 100, carbon dioxide in the second receiving space 150 can enter the first receiving space 140, thereby improving the water intake efficiency of the liquid tank 100.

[0074] In some embodiments, please refer to Figure 1 The first gas medium 900 is composed of carbon dioxide, and the first liquid medium 800 is composed of water. The first gas inlet pipe 500 discharges the first gas medium 900 into the second containment space 150. At this time, the first liquid medium 800 is discharged from the first drain valve 400.

[0075] Please refer to Figures 1 to 4In this embodiment, the partition 200 is provided with a plurality of first hole groups. Along the first direction Y, the plurality of first hole groups are spaced apart. Each first hole group includes a plurality of first holes 210 spaced apart along the vertical direction Z. The first direction Y, the thickness direction X of the partition, and the vertical direction Z are mutually perpendicular. The plurality of first hole groups include adjacent first sub-hole groups and second sub-hole groups. Along the first direction Y, any first hole 210 of the first sub-hole group is positioned opposite to the corresponding first hole 210 of the second sub-hole group.

[0076] The partition 200 is provided with a plurality of first hole groups. Along the first direction Y, the plurality of first hole groups are spaced apart and arranged sequentially. The plurality of first hole groups include a plurality of first holes 210 spaced apart along the vertical direction Z. The plurality of first holes 210 are arranged sequentially in the vertical direction Z. The first direction Y, the vertical direction Z and the thickness direction X of the partition are perpendicular to each other. The plurality of first hole groups include two adjacent first sub-hole groups and second sub-hole groups. Along the first direction Y, any first hole 210 of the first sub-hole group and any first hole 210 of the second sub-hole group are arranged opposite each other. That is, each first hole 210 in the first sub-hole group is flush with each first hole 210 in the corresponding second sub-hole group in the first direction Y.

[0077] Multiple first hole groups are provided on the partition 200, so that when the liquid tank 100 is filled with water, carbon dioxide in the second containment space 150 can enter the first containment space 140. This avoids the situation where carbon dioxide stagnates in the second containment space 150 and cannot be discharged due to the obstruction of the partition 200. Moreover, the multiple first hole groups include adjacent first sub-hole groups and second sub-hole groups. Along the first direction Y, any first hole 210 of the first sub-hole group is arranged opposite to the corresponding first hole 210 of the second sub-hole group. This makes it easier for staff to check the condition of the partition 200 and whether the first holes 210 are blocked when the liquid tank 100 is maintained and cleaned. If a blockage is found, it can be located and cleaned more accurately.

[0078] Moreover, the multiple first hole groups include adjacent first sub-hole groups and second sub-hole groups. Along the first direction Y, any first hole 210 of the first sub-hole group is arranged opposite to the corresponding first hole 210 of the second sub-hole group. This allows carbon dioxide in the second containment space 150 to flow more smoothly and evenly into the first containment space 140, improving the liquid intake efficiency of the liquid tank 100 and enhancing the stability and reliability of the liquid intake of the liquid tank 100.

[0079] Please refer to Figures 1 to 4 In this embodiment, along the first direction Y, the distance between two adjacent first holes 210 is A, and along the vertical direction Z, the distance between two adjacent first holes 210 is B, satisfying: 5mm≤A≤10mm, 5mm≤B≤10mm.

[0080] For example, the first holes 210 can be evenly and spaced on the partition 200. The distance A between two adjacent first holes 210 along the first direction Y and the distance B between two adjacent first holes 210 along the vertical direction Z can be the same. The distance A between two adjacent first holes 210 along the first direction Y can be 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, etc., and the distance B between two adjacent first holes 210 along the vertical direction Z can be 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, etc. This ensures that there are a sufficient number of first holes 210 on the partition 200, so that when water enters the liquid tank 100, carbon dioxide in the second containing space 150 can be fully discharged into the first containing space 140. On the other hand, the distance between two adjacent first holes 210 must be controlled within a reasonable range to avoid the first holes 210 being too close together, which would significantly reduce the structural strength of the partition 200 and affect its use.

[0081] Furthermore, the appropriate distance between the first holes 210 ensures that when carbon dioxide enters the first containment space 140 from the second containment space 150, there will be no excessive turbulence and resistance due to the small distance between the first holes 210, nor will there be uneven flow of carbon dioxide from the second containment space 150 into the first containment space 140 due to the large distance between the first holes 210.

[0082] In addition, 5mm≤A≤10mm and 5mm≤B≤10mm make it easier to process the first hole 210. When mass-producing the partition 200, it is easier to control the error of the hole spacing, ensuring that the performance of each partition 200 is similar, thereby ensuring the quality stability of the entire liquid tank structure 1000.

[0083] Please refer to Figures 1 to 4 In this embodiment, the diameter of the first hole 210 is C, which satisfies: 1mm≤C≤5mm.

[0084] For example, the aperture C of the first hole 210 can be 1mm, 2mm, 3mm, 4mm or 5mm, etc. By controlling the orifice diameter C of the first hole 210 within the range of 1mm to 5mm, on the one hand, during the drainage process of the liquid tank 100, a smaller amount of liquid will flow from the first receiving space 140 into the second receiving space 150 through the first hole 210. Moreover, as the drainage process proceeds, the height of the liquid in the first receiving space 140 in the vertical direction Z will decrease, and carbon dioxide in the second receiving space 150 will leak partially into the first receiving space 140 through the first hole 210. By keeping 1mm≤C≤5mm, the inflow of carbon dioxide from the second receiving space 150 into the first receiving space 140 can be minimized, thereby improving the drainage capacity of the liquid tank 100 and reducing the contact area between carbon dioxide and the liquid surface. On the other hand, when the liquid tank 100 is filled with water, the orifice diameter C of the first hole 210 satisfies 1mm≤C≤5mm, which ensures that the orifice diameter of the first hole 210 is not too small, and the carbon dioxide in the second receiving space 150 can be uniformly and stably discharged into the first receiving space 140, thereby improving the water intake efficiency of the liquid tank 100.

[0085] Please refer to Figures 1 to 4 In this embodiment, along the thickness direction X of the partition, the sum of the projected areas of the plurality of first holes 210 is D1, and the minimum exhaust cross-sectional area of ​​the first exhaust valve 300 is D2, satisfying: D2≥D1.

[0086] When water enters the liquid tank 100 through the first drain valve 400, and gas needs to be discharged, the first vent valve 300 is the main venting channel. Since D2 ≥ D1, the venting capacity of the first vent valve 300 is at least not less than the carbon dioxide flow capacity achievable through the first hole 210 on the partition 200. This ensures that when water enters the liquid tank 100 and carbon dioxide is discharged, carbon dioxide in the second containment space 150 can be discharged from the first vent valve 300 at a relatively fast rate, preventing the accumulation of carbon dioxide in the second containment space 150 and avoiding excessive pressure. This ensures the safe and stable operation of the liquid tank 100 and improves the stability and reliability of the liquid tank structure 1000.

[0087] Under different operating conditions, the water inlet rate of the liquid tank 100 may be different. The larger cross-sectional area of ​​the first vent valve 300 can ensure that even under the condition of a large water inlet rate of the liquid tank 100, the carbon dioxide in the second containment space 150 can be discharged into the first containment space 140 in a timely manner, and then discharged from the first vent valve 300 in a timely manner.

[0088] Please refer to Figures 1 to 4In this embodiment, along the thickness direction X of the partition, the first hole 210 has a second opening 211 and a third opening 212. The size of the second opening 211 is larger than the size of the third opening 212. The second opening 211 faces the second receiving space 150, and the third opening 212 faces the first receiving space 140.

[0089] The size of the third opening 212 facing the first containment space 140 is smaller than the size of the second opening 211 facing the second containment space 150. That is, the diameter of the third opening 212 is smaller than the diameter of the second opening 211. This makes the first hole 210 form a funnel-like shape, which can guide the carbon dioxide in the second containment space 150 to flow into the first containment space 140. When the liquid tank 100 is filled with water, the pressure in the second containment space 150 increases, and the carbon dioxide in the second containment space 150 can enter the first hole 210 more smoothly through the larger second opening 211, and then enter the first containment space 140 through the third opening 212.

[0090] Moreover, since the size of the second opening 211 is larger than that of the third opening 212, during the process of water entering the liquid tank 100, less liquid in the first containment space 140 will flow into the second containment space 150, thereby reducing the heat exchange area of ​​carbon dioxide in the second containment space 150, reducing the degree of carbon dioxide contraction, and improving the drainage capacity of the liquid tank structure 1000.

[0091] Please refer to Figures 1 to 4 In this embodiment, the size of the first hole 210 gradually increases along the thickness direction X of the partition and away from the first accommodating space 140.

[0092] When carbon dioxide flows from the second containment space 150 to the first containment space 140, since the size of the first hole 210 gradually increases in the direction away from the first containment space 140, the carbon dioxide will have a wider channel in the initial stage of entering the first hole 210, and can enter more smoothly. This gradually narrowing channel design conforms to the principle of fluid dynamics, which can effectively reduce the resistance of carbon dioxide flowing in the first hole 210, so that carbon dioxide can pass through the baffle 200 more efficiently and enhance the drainage capacity of the liquid tank structure 1000.

[0093] Moreover, the size of the first orifice 210 gradually increases, making the pressure change more uniform. Carbon dioxide will not encounter sudden changes in orifice diameter and cause pressure fluctuations, but will flow under a relatively gentle pressure gradient. This helps to maintain the stability of the pressure inside the liquid tank 100 and improve the safety and reliability of the liquid tank 100.

[0094] In addition, the uniform variation in the size of the first hole 210 can reduce stress concentration in the baffle 200. Since the pressure change around the first hole 210 is relatively gentle, the stress distribution on the baffle 200 is more uniform, which reduces the risk of damage or deformation of the baffle 200 due to excessive local stress, extends the service life of the baffle 200, and ensures the long-term stable operation of the liquid tank structure 1000.

[0095] Please refer to Figures 1 to 4 In this embodiment, the volume of the first accommodating space 140 is larger than the volume of the second accommodating space 150.

[0096] The volume of the first containment space 140 is larger than the volume of the second containment space 150. That is, when both the first containment space 140 and the second containment space 150 are filled with carbon dioxide, the cooling area of ​​the carbon dioxide in the first containment space 140 is larger than the cooling area of ​​the carbon dioxide in the second containment space 150. The first air inlet pipe 500 is connected to the second containment space 150, and the gas in the first air inlet pipe 500 is discharged into the second containment space 150. In this way, the carbon dioxide directly enters the second containment space 150. Compared with directly entering the first containment space 140, the sum of the contact area between the carbon dioxide and the liquid, the contact area of ​​the inner wall of the liquid tank 100, and the contact area of ​​the partition 200 in the second containment space 150, which is the cooling area of ​​the carbon dioxide, is greater than the cooling area of ​​the carbon dioxide in the first containment space 140. This can reduce the degree of cooling and contraction of the carbon dioxide and discharge more water from the liquid tank 100.

[0097] Please refer to Figures 1 to 4 In this embodiment, a sealing member 600 is provided on the partition 200. The sealing member 600 is movably disposed on the partition 200 to block or open at least part of the first hole 210.

[0098] A sealing element 600 is provided on the partition 200, which can block multiple first holes 210. For example, when the liquid tank 100 needs to drain, the sealing element 600 moves on the partition 200, thereby blocking the first holes 210. Carbon dioxide is discharged into the second containment space 150. Carbon dioxide in the second containment space 150 cannot leak from the first holes 210 into the first containment space 140, reducing the leakage volume of carbon dioxide and improving the drainage capacity of the liquid tank structure 1000. Furthermore, liquid in the first containment space 140 will not enter the second containment space 150 from the first holes 210, reducing the cooling area for carbon dioxide.

[0099] Please refer to Figures 1 to 4In this embodiment, the sealing member 600 is constructed as a plurality of first plates 610 stacked along the thickness direction X of the partition. Along the vertical direction Z, the plurality of stacked first plates 610 are movably disposed on the partition 200. When the first air inlet pipe 500 is inflated, the plurality of stacked first plates 610 are laid flat on the partition 200 to block the plurality of first holes 210. Along the thickness of the partition 200, the projections of the plurality of first plates 610 do not overlap.

[0100] For example, the number of first plates 610 can be 2, 3, 4, etc. Multiple first plates 610 can be stacked along the thickness direction X of the partition. In this way, when the liquid tank 100 needs to be vented after liquid filling, the stacking of multiple first plates 610 can minimize the space occupied by the first plates 610 in the receiving chamber 110. When the liquid tank 100 needs to be vented, the carbon dioxide in the second receiving space 150 needs to be discharged into the first receiving space 140 through the first hole 210. The stacking of multiple first plates 610 can reduce the obstruction of the multiple first plates 610 to the first hole 210 on the partition 200, so that the carbon dioxide in the second receiving space 150 can enter the first receiving space 140 through the multiple first holes 210.

[0101] When the liquid tank 100 needs to be drained, multiple stacked first plates 610 are laid flat on the partition 200, thereby blocking multiple first holes 210. The first air inlet pipe 500 inflates the second containment space 150. Carbon dioxide in the second containment space 150 will not enter the first containment space 140 through the first holes 210, reducing the probability of carbon dioxide leakage and ensuring the pressure of the second containment space 150. Moreover, liquid in the first containment space 140 will not enter the second containment space 150 through the first holes 210, reducing the heat exchange area of ​​carbon dioxide in the second containment space 150 and improving the drainage capacity of the liquid tank structure 1000.

[0102] Please refer to Figures 1 to 4 In this embodiment, along the vertical direction Z, the partition 200 has a first end 220 and a second end 230 arranged opposite to each other. The first end 220 is connected to the first top wall 120, and the second end 230 faces the first bottom wall 130. The distance between the second end 230 and the first bottom wall 130 is E1. Along the first direction Y, the length of the partition 200 is E2. The first direction Y, the thickness direction X of the partition, and the vertical direction Z are all perpendicular to each other. Along the first direction Y, the minimum cross-sectional area of ​​the second accommodating space 150 is D3, and the minimum cross-sectional area of ​​the first drain valve 400 is D4, satisfying: E1*E2>D4, D3>D4.

[0103] For example, the liquid tank 100 not only has a first top wall 120 and a first bottom wall 130 arranged opposite each other, but also has four side walls connecting the first top wall 120 and the first bottom wall 130. The first end 220 of the partition 200 is connected to the first top wall 120, and the second end 230 of the partition 200 faces the first bottom wall 130. The two ends of the partition 200 in the first direction Y respectively abut against the two side walls of the liquid tank 100 in the first direction Y, thereby sealing the two side walls. The distance between the second end 230 and the first bottom wall 130 is E1. Along the first direction Y, the length of the partition 200 is E2. E1*E2 is greater than D4, that is, the size of the first opening 160 between the partition 200 and the first bottom wall 130 is greater than the minimum cross-sectional area D4 of the first drain valve 400. The minimum cross-sectional area D3 of the second containment space 150 is greater than the minimum cross-sectional area D4 of the first drain valve 400. This ensures that the water in the second containment space 150 can be efficiently and fully discharged into the first drain valve 400 and then discharged from the first drain valve 400. This reduces the probability of a decrease in the drainage rate in the second containment space 150 due to E1*E2 or D4 being too small, ensuring that the water in the liquid tank 100 can be discharged quickly and stably. This avoids the situation where the carbon dioxide discharge rate is greater than the liquid tank 100 drainage rate, and avoids the situation where there is too much carbon dioxide in the liquid tank 100, causing the carbon dioxide pressure in the liquid tank 100 to be too high. This prevents the pressure in the liquid tank 100 from exceeding the pressure bearing capacity of the liquid tank 100 and extends the service life of the liquid tank 100.

[0104] Please refer to Figures 1 to 4 In this embodiment, the size of the partition 200 in the vertical direction Z is adjustable.

[0105] Along the vertical direction Z, the size of the partition 200 is adjustable, which means that the size of the first opening 160 is adjustable. This allows the size of the first opening 160 to be adjusted according to the actual drainage needs of the liquid tank structure 1000, thereby expanding the adjustment range of the first size, improving drainage efficiency, expanding the application range of the liquid tank structure 1000, and expanding the application scenarios of the liquid tank structure 1000.

[0106] Please refer to Figures 1 to 4 In this embodiment, the liquid tank structure 1000 further includes a heating sheet 700, which is attached to the first top wall 120 and located in the second accommodating space 150.

[0107] For example, the heating sheet 700 can be configured as a PTC heating sheet 700. When carbon dioxide is filled into the second containment space 150, the heating sheet 700 can heat the carbon dioxide in the second containment space 150, causing the carbon dioxide to expand due to heat, or in other words, keeping the temperature of the carbon dioxide from decreasing, reducing the probability of the carbon dioxide contracting when it cools, and improving the stability and reliability of the liquid tank structure 1000.

[0108] The heating sheet 700 can also heat the liquid in the liquid tank 100, thereby raising the temperature of the liquid. Even if carbon dioxide comes into contact with the liquid, the high liquid temperature will not reduce the carbon dioxide drainage efficiency.

[0109] Please refer to Figure 5 This application also proposes a ship 2000, including the liquid tank structure 1000 of any of the embodiments of this application.

[0110] The ship 2000 proposed in this application embodiment has a bulkhead 200 disposed in the receiving chamber 110 of the liquid tank 100. The bulkhead 200 is spaced apart from the first bottom wall 130 to form a first opening 160 connecting the first receiving space 140 and the second receiving space 150. This can reduce the contact area between carbon dioxide and the liquid in the liquid tank 100, reduce the cooling area of ​​carbon dioxide, reduce the shrinkage volume of carbon dioxide, and improve the drainage capacity of the liquid tank structure 1000. The bulkhead 200 is provided with a plurality of first holes 210, which penetrate the bulkhead 200 along the thickness direction X. In this way, during the process of water entering the liquid tank 100, carbon dioxide in the second receiving space 150 can enter the first receiving space 140, thereby improving the water intake efficiency of the liquid tank 100.

[0111] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0112] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to interchangeably. Each embodiment focuses on describing the differences from other embodiments. In particular, the system embodiments are basically similar to the method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions in the method embodiments.

[0113] The above description is merely an embodiment of this application and is not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

[0114] Although embodiments of this application have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of this application, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A liquid tank structure for reducing heat loss from supercritical carbon dioxide drainage, characterized in that, include: A liquid tank having a receiving chamber, and in a vertical direction, the liquid tank having a first top wall and a first bottom wall disposed opposite to each other; A partition is disposed in the receiving chamber, the partition being connected to the first top wall and extending toward the first bottom wall to divide the receiving chamber into a first receiving space and a second receiving space; A first exhaust valve and a first drain valve, wherein the first exhaust valve is disposed on the first top wall and can selectively connect to the first receiving space, and the first drain valve is disposed on the first bottom wall and can selectively connect to the receiving chamber; A first air intake pipe extends into the second accommodating space, and the first air intake pipe is used to fill the second accommodating space with supercritical carbon dioxide. The partition is spaced apart from the first bottom wall to form a first opening connecting the first and second accommodating spaces. The partition has a plurality of first holes that penetrate the partition along its thickness direction. The thickness direction of the partition is perpendicular to the vertical direction.

2. The liquid tank structure according to claim 1, characterized in that, The partition is provided with a plurality of first hole groups, which are spaced apart along a first direction. Each first hole group includes a plurality of first holes spaced apart along the vertical direction. The first direction, the thickness direction of the partition, and the vertical direction are perpendicular to each other. The plurality of first hole groups include adjacent first sub-hole groups and second sub-hole groups, and along the first direction, any first hole in the first sub-hole group is arranged opposite to the corresponding first hole in the second sub-hole group.

3. The liquid tank structure according to claim 2, characterized in that, Along the first direction, the distance between two adjacent first holes is A, and along the vertical direction, the distance between two adjacent first holes is B, satisfying: 5mm≤A≤10mm, 5mm≤B≤10mm.

4. The liquid tank structure according to claim 1, characterized in that, The diameter of the first hole is C, which satisfies: 1mm≤C≤5mm.

5. The liquid tank structure according to claim 1, characterized in that, Along the thickness direction of the partition, the sum of the projected areas of the plurality of first holes is D1, and the minimum exhaust cross-sectional area of ​​the first exhaust valve is D2, satisfying: D2≥D1.

6. The liquid tank structure according to claim 1, characterized in that, Along the thickness direction of the partition, the first hole has a second opening and a third opening, the size of the second opening is larger than the size of the third opening, the second opening faces the second receiving space, and the third opening faces the first receiving space.

7. The liquid tank structure according to claim 6, characterized in that, Along the thickness direction of the partition and away from the first accommodating space, the size of the first hole gradually increases.

8. The liquid tank structure according to claim 1, characterized in that, The volume of the first accommodating space is larger than the volume of the second accommodating space.

9. The liquid tank structure according to claim 1, characterized in that, The partition is provided with a sealing element, which is movably disposed on the partition to block or open at least part of the first hole.

10. The liquid tank structure according to claim 9, characterized in that, The sealing component is constructed as a plurality of first plates stacked along the thickness direction of the partition. Along the vertical direction, the plurality of stacked first plates are movably disposed on the partition. When the first air inlet pipe is inflated, the plurality of stacked first plates are laid flat on the partition to block the plurality of first holes. Along the thickness of the partition, the projections of the plurality of first plates do not overlap.

11. The liquid tank structure according to claim 1, characterized in that, Along the vertical direction, the partition has a first end and a second end that are arranged opposite to each other. The first end is connected to the first top wall, and the second end faces the first bottom wall. The distance between the second end and the first bottom wall is E1. Along the first direction, the length of the partition is E2. The first direction, the thickness direction of the partition, and the vertical direction are all perpendicular to each other. Along the first direction, the minimum cross-sectional area of ​​the second accommodating space is D3, and the minimum cross-sectional area of ​​the first drain valve is D4, satisfying: E1*E2>D4, D3>D4.

12. The liquid tank structure according to claim 1, characterized in that, The size of the partition is adjustable along the vertical direction.

13. The liquid tank structure according to claim 1, characterized in that, The liquid tank structure also includes a heating sheet, which is attached to the first top wall and located in the second accommodating space.

14. A ship, characterized in that, The liquid tank structure includes any one of claims 1-13.

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