Cargo tank design method, cargo tank and ship

Abstract

The present invention relates to the field of ship technology, and in particular to a liquid cargo tank design method, a liquid cargo tank, and a ship. The liquid cargo tank design method comprises the following steps: an independent liquid cargo tank is symmetrical about a longitudinal plane of a hull, and is formed into an annular structure by a bottom plate, a bottom side sloping plate, a side plate, a top side sloping plate, and a top plate; the bottom plate is arranged parallel to and spaced apart from the bottom plate inside the hull; the bottom side sloping plate is not parallel to the hull hopper tank sloping plate, and the angle between the bottom side sloping plate and the horizontal plane is greater than the angle between the hull hopper tank sloping plate and the horizontal plane, so that the distance between the side plate and the hull hopper tank sloping plate is shortened; the side plate is arranged perpendicular to the bottom plate, and the shortest distance between the side plate and the hull hopper tank sloping plate is not less than a safety set distance; the top side sloping plate is arranged parallel to and spaced apart from the hull hopper tank sloping plate; the top plate is arranged parallel to and spaced apart from the bottom plate, and the top plate is spaced apart from the cabin deck. The present invention can improve the effective utilization rate of the space inside the ship, reduce the filling amount of flameproof and explosion-proof gas, and improve the economic efficiency of ship operation.

Description

Technical Field

[0001] The present invention relates to the technical field of ships, and in particular to a liquid cargo tank design method, a liquid cargo tank and a ship. Background Art

[0002] In the process of transporting liquids on board ships, it is necessary to set up type A independent liquid cargo tanks and type B independent liquid cargo tanks on board ships. Since type A independent liquid cargo tanks and type B independent liquid cargo tanks are similar in structure, the following description will take type A as an example. Figure 1 As shown, an independent liquid cargo tank 1 is typically used on liquefied gas carriers. The cross-section of a Type A independent liquid cargo tank 1 is defined by a bottom plate 11, a bottom sloping plate 12, a side plate 13, a top sloping plate 14, and a roof plate 15. In the prior art, the bottom sloping plates 12 on either side of the Type A independent liquid cargo tank 1 are parallel to the hull hopper tank sloping plates 22, typically at an angle of 45 degrees to the horizontal plane. The side plates 13 of the Type A independent liquid cargo tank 1 maintain at least a certain safety distance from the hull outer plating 23 to prevent collision. A ship is often equipped with three or four Type A independent liquefied tanks. These Type A independent liquefied tanks are arranged along the length of the ship. The hull hopper tank sloping plates 22 remain continuous throughout the entire cargo hold area, with a constant inclination angle. The bottom sloping plates 12 of each Type A independent liquid cargo tank 1 have the same inclination angle. The cabin space surrounding the Type A independent liquid cargo tank 1 is filled with a flame-proof and explosion-proof gas.

[0003] In the middle of the hull 2, the hull plating 23 is perpendicular to the horizontal plane, and the side plates 13 of the independent liquid cargo tank 1 are parallel to the hull plating 23, with the minimum safe distance between them, ensuring full utilization of the ship's interior space. However, at the front and rear ends of the hull, to form streamlined surfaces to reduce navigation resistance, the ship's lines gradually contract inward, and the bottom of the hull contracts more rapidly, typically resulting in the hull's sides expanding outward. In cross-section at these locations, the hull plating 23 is typically curved. Due to the constraints of the independent liquefied tank's side plates 13 maintaining a certain safe distance from the hull plating 23, and the fixed inclination angle of the bottom sloping plate 12, the distance between the side plates 13 of the independent liquid cargo tank 1 and the hull plating 23 gradually increases above the bottom sloping plate 12 of the independent liquid cargo tank 1. This space becomes unusable, reducing the effective utilization rate of the ship's interior space and increasing the amount of flameproof and explosion-proof gas required, reducing the ship's operating economy.

[0004] Therefore, a liquid cargo tank design method, a liquid cargo tank and a ship are needed to solve the above problems. Summary of the Invention

[0005] The object of the present invention is to provide a liquid cargo tank design method, a liquid cargo tank and a ship, which can improve the effective utilization rate of the space inside the ship, reduce the filling amount of flameproof and explosion-proof gas, and improve the economy of ship operation.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] The cargo tank design method includes the following steps:

[0008] The independent liquid cargo tank is symmetrical about the longitudinal plane of the hull and is surrounded by a ring structure consisting of the bottom plate, bottom side sloping plate, side plate, top side sloping plate and top plate;

[0009] The bottom plate is arranged parallel to and spaced apart from the bottom plate inside the hull;

[0010] The bottom side sloping plate is not parallel to the hull hopper tank sloping plate, and the angle between the bottom side sloping plate and the horizontal plane is greater than the angle between the hull hopper tank sloping plate and the horizontal plane, so that the distance between the side plate and the hull outer plate is shortened;

[0011] The side plates are arranged perpendicular to the bottom plate, and the shortest distance between the side plates and the hull outer plate is not less than a safety set distance;

[0012] The top side inclined plate is arranged parallel to and spaced apart from the hull top side tank inclined plate;

[0013] The top plate is arranged in parallel with the bottom plate and spaced apart from each other, and the top plate is also spaced apart from the cabin deck.

[0014] Furthermore, the inclination angle of the bottom sloping plate is determined by the curved shape of the hull outer plating and the maximum volume of the independent liquid cargo tank.

[0015] Furthermore, a plurality of positions are selected within the length of the independent liquid cargo tank, and the angle of the bottom inclined plate is determined by maximizing the sum of the cross-sectional areas of the positions.

[0016] Furthermore, the bottom edge inclined plate is divided into several segments, and the inclination angles between adjacent segments are different.

[0017] Furthermore, a reinforcement structure is fixedly provided on a side of the side plate facing away from the hull outer plate.

[0018] Furthermore, an inspection passage is provided between the side plate and the hull outer plate.

[0019] Furthermore, the outer wall surface of the independent liquid cargo tank is coated with insulating material.

[0020] Furthermore, a central longitudinal bulkhead plate is provided in the annular structure, the central longitudinal bulkhead plate is arranged parallel to and spaced apart from the side plates, one end of the central longitudinal bulkhead plate is connected to the bottom plate, and the other end of the central longitudinal bulkhead plate is connected to the top plate.

[0021] A liquid cargo tank comprises an independent liquid cargo tank, a front sealing plate and a rear sealing plate. The independent liquid cargo tank is manufactured by the liquid cargo tank design method as described above. The front sealing plate and the rear sealing plate are arranged at the front and rear ends of the independent liquid cargo tank.

[0022] A ship comprises a hull and the liquid cargo tank as described above, wherein the liquid cargo tank is arranged on the hull.

[0023] Beneficial effects of the present invention:

[0024] The present invention provides a method for designing a liquid cargo tank, wherein the independent liquid cargo tank is symmetrical about the mid-longitudinal plane of the hull and is surrounded by a bottom plate, a bottom side sloping plate, a side plate, a top side sloping plate, and a top plate to form an annular structure. The bottom plate is arranged parallel to and spaced apart from the inner bottom plate of the hull. The bottom side sloping plate is not parallel to the hull hopper tank sloping plate, and the angle between the bottom side sloping plate and the horizontal plane is greater than the angle between the hull hopper tank sloping plate and the horizontal plane, thereby shortening the distance between the side plate and the hull hopper plate. The side plate is arranged perpendicular to the bottom plate, and the shortest distance between the side plate and the hull hopper plate is not less than a safety set distance. The top side sloping plate is arranged parallel to and spaced apart from the hull hopper tank sloping plate, and the top plate is arranged parallel to and spaced apart from the bottom plate, and the top plate is spaced apart from the cabin deck. Because the angle between the bottom side sloping plate and the horizontal plane is greater than the angle between the hull hopper tank sloping plate and the horizontal plane, the distance between the side plate and the hull hopper plate is shortened, thereby fully utilizing the space between the hull hopper plate and the side plate, while simultaneously reducing the space between the side plate and the hull hopper plate. By designing an independent liquid cargo tank in the above manner, the effective utilization rate of the space inside the ship can be improved, the filling amount of flame-proof and explosion-proof gas can be reduced, and the economic efficiency of ship operation can be improved.

[0025] The present invention provides a liquid cargo tank comprising an independent liquid cargo tank, a front cover plate and a rear cover plate. The independent liquid cargo tank is manufactured using the liquid cargo tank design method described above, which can improve the effective utilization rate of the space inside the ship, reduce the filling amount of flameproof and explosion-proof gas, and improve the economic efficiency of ship operation.

[0026] The present invention provides a ship comprising a hull and the liquid cargo tank as described above, which can improve the effective utilization of the space inside the ship, reduce the filling amount of flameproof and explosion-proof gas, and improve the economic efficiency of ship operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in describing the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without any creative work.

[0028] Figure 1 is a cross-sectional view of a liquid cargo tank in the prior art;

[0029] Figure 2 It is a cross-sectional view of a liquid cargo tank in a liquid cargo tank design method of the present invention.

[0030] In the picture:

[0031] 1. Independent cargo tank; 11. Bottom plating; 12. Bottom side sloping plating; 13. Side plating; 14. Top side sloping plating; 15. Top plating; 16. Center longitudinal bulkhead plating; 2. Hull; 21. Hull inner bottom plating; 22. Hull hopper tank sloping plating; 23. Hull outer plating; 24. Hull top side tank sloping plating; 25. Cabin deck. DETAILED DESCRIPTION

[0032] Before any embodiments of the present application are explained in detail, it is to be understood that the application is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the foregoing drawings.

[0033] In this application, the terms "comprises," "includes," "has," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not preclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0034] In this application, the terms "connect," "combine," "couple," and "install" may refer to direct connection, combination, coupling, or installation, or indirect connection, combination, coupling, or installation. For example, a direct connection refers to two parts or components being connected together without an intermediary, and an indirect connection refers to two parts or components being connected to at least one intermediary, with the two parts or components being connected via the intermediary. Furthermore, "connect" and "couple" are not limited to physical or mechanical connections or couplings and may include electrical connections or couplings.

[0035] In this application, it will be understood by those skilled in the art that the function performed by an assembly can be performed by one assembly, multiple assemblies, one part, or multiple parts. Similarly, the function performed by a part can also be performed by one part, one assembly, or a combination of multiple parts.

[0036] In the present application, the terms "upper", "lower", "left", "right", "front", "back" and other directional words are described based on the orientation and positional relationship shown in the accompanying drawings, and should not be understood as limiting the embodiments of the present application. In addition, in the context, it is also necessary to understand that when it is mentioned that an element is connected to another element "upper" or "lower", it can not only be directly connected to the other element "upper" or "lower", but also be indirectly connected to the other element "upper" or "lower" through an intermediate element. It should also be understood that directional words such as upper side, lower side, left side, right side, front side, back side, etc. not only represent the positive orientation, but can also be understood as the lateral orientation. For example, below can include directly below, lower left, lower right, lower front and lower back, etc.

[0037] In the process of designing and manufacturing liquid transport ships, in order to improve the effective utilization of the space inside the ship, reduce the filling amount of flameproof and explosion-proof gas, and improve the economic efficiency of ship operation, such as Figure 2 As shown, the present invention provides a liquid cargo tank design method. The liquid cargo tank design method includes the following steps:

[0038] The independent liquid cargo tank 1 is symmetrical about the longitudinal plane of the hull and is formed into an annular structure by a bottom plate 11, a bottom side sloping plate 12, a side plate 13, a top side sloping plate 14 and a top plate 15;

[0039] The bottom plate 11 is parallel to and spaced apart from the inner bottom plate 21 of the hull;

[0040] The bottom sloping plate 12 is not parallel to the hull hopper tank sloping plate 22, and the angle between the bottom sloping plate 12 and the horizontal plane is greater than the angle between the hull hopper tank sloping plate 22 and the horizontal plane, so that the distance between the side plate 13 and the hull outer plate 23 is shortened;

[0041] The side plate 13 is arranged perpendicular to the bottom plate 11, and the shortest distance between the side plate 13 and the hull outer plate 23 is not less than the safety set distance;

[0042] The top side inclined plate 14 is parallel to and spaced apart from the hull top side tank inclined plate 24;

[0043] The top plate 15 is spaced apart from the bottom plate 11 and parallel to each other, and the top plate 15 is spaced apart from the cabin deck 25 .

[0044] Because the angle between the bottom sloping plate 12 and the horizontal plane is greater than the angle between the hull bottom tank sloping plate 22 and the horizontal plane, the distance between the side plate 13 and the hull outer plating 23 is shortened, thereby fully utilizing the space between the side plate 13 and the hull outer plating 23 and simultaneously reducing the space between the side plate 13 and the hull outer plating 23. By adopting the above-mentioned design method of the independent liquid cargo tank 1, the effective utilization rate of the space inside the ship can be improved, the filling amount of flameproof and explosion-proof gas can be reduced, and the economic efficiency of ship operation can be improved.

[0045] Furthermore, the inclination angle of the bottom sloping plate 12 is determined by the curvilinear shape of the hull plating 23 and the maximum volume of the independent liquid cargo tank 1. By rationally planning the inclination angle of the bottom sloping plate 12, the space between the side plates 13 and the hull plating 23 can be fully utilized. Furthermore, by optimizing the inclination angle of the bottom sloping plate 12 in accordance with the curvilinear shape of the hull plating 23, the side plates 13 can be adapted to the hull plating 23 to the greatest extent possible, thereby increasing the volume of the liquid cargo tank.

[0046] Furthermore, in some embodiments, multiple locations are selected within the length of the independent liquid cargo tank 1, and the angle of the bottom sloping plate 12 is determined based on the maximum sum of the cross-sectional areas at each location. This approach allows for an overall design of the independent liquid cargo tank 1, enabling a rationally optimized design of the angle of the bottom sloping plate 12.

[0047] Furthermore, in some embodiments, the bottom sloping plate 12 is divided into several segments, with adjacent segments having different inclination angles. When adjacent segments are designed with different inclination angles, the bottom sloping plate 12 is formed by welding two or more intersecting angled segments along its length. In this manner, the bottom sloping plate 12, formed by assembling several segments, can adapt to changes in the hull plating 23 to the greatest extent possible, thereby further increasing the cargo tank's capacity.

[0048] Furthermore, a reinforcement structure is fixedly installed on the side of the side plate 13 facing away from the hull outer plate 23. By providing a reinforcement structure, the strength of the side plate 13 can be improved, thereby effectively preventing the liquid cargo tank from deforming after it is filled with liquid. Moreover, compared with the prior art, the length of the side plate 13 is significantly longer than the length of the bottom sloping plate 12 and the top sloping plate 14, and the total load of the side plate 13 is greater than that of the bottom sloping plate 12 and the top sloping plate 14. This design method can increase the length of the bottom sloping plate 12 and the top sloping plate 14, shorten the length of the side plate 13, increase the total load borne by the bottom sloping plate 12 and the top sloping plate 14, and reduce the total load of the side plate 13, thereby improving the situation where the three parts of the structure are originally subjected to very uneven forces. The load on the side plate 13 reduces the strength required for the reinforcement structure, and the specifications of the relevant reinforcement structure can be reduced, thereby achieving the effect of reducing weight. The reinforcement structure can be a rib or a stiffener. Specifically, the reinforcement structure is a commonly used structure in ship construction and will not be described in detail here.

[0049] Furthermore, an inspection passage is provided between the side plate 13 and the hull outer plate 23. In this embodiment, the inspection passage is arranged on the inner side of the hull outer plate 23. As the distance between the side plate 13 and the hull outer plate 23 is reduced, the size of the inspection passage can be reduced.

[0050] Furthermore, the outer wall of the independent liquid cargo tank 1 is coated with insulating material. By coating with insulating material, the need for loading refrigerated liquid cargo can be met, and through the above design, after the volume of the liquid cargo tank is increased, the refrigeration capacity required per unit volume of cargo can be reduced.

[0051] Furthermore, since liquid cargo tanks are usually filled with flammable and explosive liquefied gas, the cabin is often filled with inert gas to improve safety. When the volume of the liquid cargo tank increases, more space in the cabin is occupied by the liquid cargo tank, and the amount of inert gas that needs to be filled is reduced, which can save related costs.

[0052] Furthermore, because the distance between the bottom sloping plate 12 and the hull hopper tank sloping plate 22 gradually increases with height, the confined space in this area is improved, facilitating construction and improving construction safety. The increased parallel length between the cargo tank's top sloping plate 14 and the hull hopper tank sloping plate 24 facilitates installation of the cargo tank's stopper in this parallel section, avoiding installation difficulties caused by insufficient parallel length.

[0053] Furthermore, a central longitudinal bulkhead plate 16 is provided in the annular structure. The central longitudinal bulkhead plate 16 is spaced apart and parallel to the side plates 13. One end of the central longitudinal bulkhead plate 16 is connected to the bottom plate 11, and the other end of the central longitudinal bulkhead plate 16 is connected to the top plate 15. The provision of the central longitudinal bulkhead plate 16 can support the liquid cargo tank, further improving the strength of the liquid cargo tank.

[0054] Liquid cargo tanks designed and manufactured using this approach, when fully loaded, can experience sagging due to the concentration of cargo amidships. Since linear contraction occurs at the fore and aft ends of the vessel, this solution increases the weight at the fore and aft ends of the cargo tank, making the weight more evenly distributed along its length and reducing sagging. This reduces safety and may also reduce the need for structural reinforcement to counteract sagging. Furthermore, due to the reduced weight of the liquid cargo tank structure, the draft is lower when the ship is unladen, reducing navigational resistance, saving fuel costs, and being more environmentally friendly. When fully loaded, the cargo tank has a greater cargo capacity and consumes less fuel per unit weight of cargo, further enhancing environmental performance.

[0055] This embodiment also provides a liquid cargo tank, including an independent liquid cargo tank 1, a front sealing plate and a rear sealing plate. The independent liquid cargo tank 1 is manufactured using the above liquid cargo tank design method. The front sealing plate and the rear sealing plate are arranged at the front and rear ends of the independent liquid cargo tank 1, which can improve the effective utilization rate of the space inside the ship, reduce the filling amount of flameproof and explosion-proof gas, and improve the economy of ship operation.

[0056] This embodiment also provides a ship, which includes a hull 2 ​​and a liquid cargo tank as described above. The liquid cargo tank is arranged on the hull 2, which can improve the effective utilization rate of the space inside the ship, reduce the filling amount of flameproof and explosion-proof gas, and improve the economy of ship operation.

[0057] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A method for designing liquid cargo tanks, characterized in that: The steps include: The independent liquid cargo tank (1) is symmetrical about the longitudinal plane of the hull and is surrounded by a bottom plate (11), a bottom side sloping plate (12), a side plate (13), a top side sloping plate (14) and a top plate (15) to form an annular structure; The bottom plate (11) is arranged parallel to and spaced apart from the inner bottom plate (21) of the hull; The bottom side sloping plate (12) is not parallel to the hull bottom tank sloping plate (22), and the angle between the bottom side sloping plate (12) and the horizontal plane is greater than the angle between the hull bottom tank sloping plate (22) and the horizontal plane, so that the distance between the side plate (13) and the hull outer plate (23) is shortened; The side plate (13) is arranged perpendicular to the bottom plate (11), and the shortest distance between the side plate (13) and the hull outer plate (23) is not less than a safety setting distance; The top side inclined plate (14) and the hull top side tank inclined plate (24) are arranged in parallel and spaced apart; The top plate (15) is arranged in parallel with the bottom plate (11) and spaced apart from each other, and the top plate (15) is also spaced apart from the cabin deck (25).

2. The liquid cargo tank design method according to claim 1, characterized in that: The inclination angle of the bottom sloping plate (12) is determined by the curved shape of the hull outer plate (23) and the maximum volume of the independent liquid cargo tank (1).

3. The liquid cargo tank design method according to claim 1, characterized in that: A plurality of positions are selected within the length of the independent liquid cargo tank (1), and the angle of the bottom inclined plate (12) is determined by maximizing the sum of the cross-sectional areas of the positions.

4. The liquid cargo tank design method according to claim 1, characterized in that: The bottom edge inclined plate (12) is divided into a plurality of segments, and the inclination angles between adjacent segments are different.

5. The liquid cargo tank design method according to claim 1, characterized in that: A reinforcement structure is fixedly provided on the side of the side plate (13) facing away from the hull outer plate (23).

6. The liquid cargo tank design method according to claim 1, characterized in that: An inspection channel is provided between the side plate (13) and the hull outer plate (23).

7. The method for designing a liquid cargo tank according to claim 1, characterized in that: The outer wall surface of the independent liquid cargo tank (1) is coated with insulating material.

8. The method for designing a liquid cargo tank according to claim 1, characterized in that: A central longitudinal bulkhead plate (16) is provided in the annular structure. The central longitudinal bulkhead plate (16) is spaced apart and parallel to the side plate (13). One end of the central longitudinal bulkhead plate (16) is connected to the bottom plate (11), and the other end of the central longitudinal bulkhead plate (16) is connected to the top plate (15).

9. Liquid cargo tank, characterized in that: The invention comprises an independent liquid cargo tank (1), a front sealing plate and a rear sealing plate, wherein the independent liquid cargo tank (1) is manufactured by adopting the liquid cargo tank design method according to any one of claims 1 to 8, and the front sealing plate and the rear sealing plate are arranged at the front and rear ends of the independent liquid cargo tank (1).

10. A vessel, characterized in that The invention comprises a hull (2) and a liquid cargo tank according to claim 9, wherein the liquid cargo tank is arranged on the hull (2).

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