Cargo tanks and hull

Abstract

The present invention provides a liquid cargo tank and a hull, and relates to the technical field of ships. The liquid cargo tank comprises: a hull, an insulation layer, and a secondary shielding structure, wherein the insulation layer is wrapped around the outside of the hull, and there is a gap between the two; the secondary shielding structure is located in the gap, and is located below the hull; the secondary shielding structure has a liquid inlet connected to the gap, and the liquid inlet is used to allow the liquid in the gap to flow into the secondary shielding structure. In this solution, the secondary shielding structure is located in the gap between the hull and the insulation layer, and the liquid cargo tank adopts a closed secondary shielding structure. The cryogenic liquid leaking from the hull will flow into the secondary shielding structure along the gap between the hull and the insulation layer, thereby preventing the cryogenic liquid leaking from the liquid cargo tank from splashing onto the hull, eliminating the hidden danger of the hull structure being damaged by low temperature, and improving the safety of the hull.

Description

Technical Field

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

[0002] The existing MOSS-type liquefied natural gas (LNG) carriers and IHI-SPB-type LNG carriers have independent liquid cargo tanks of type B. According to the specifications, a partial secondary barrier is required. The secondary barrier is an open structure, that is, the liquid leaking from the main shield is diverted through the leakage channel to one or more upper open receiving trays, that is, the partial secondary barrier, so that the leaked liquid evaporates in the receiving tray. Since the liquid is LNG, the temperature can reach minus 163°C. During natural evaporation, the insulation layer of the liquid cargo tank and the space enclosed by the hull may be affected by the diffusion of low temperature. The hull structure needs to use low-temperature materials or set up insulation layers to avoid damage from low temperatures.

[0003] The secondary shielding structure of the existing B-type tank is basically an open structure, placed on the bottom plate inside the hull. When the hull moves with the wind and waves at sea, the cryogenic liquid leaking from the main shield wall will slosh and splash around when it gathers in the receiving tray, thus bringing the risk of cryogenic damage to the hull. In the case of a large amount of leakage, there is even the possibility of overflowing the receiving tray, posing a hidden danger to the safe operation of the hull. Summary of the invention

[0004] The object of the present invention is to provide a liquid cargo tank and a hull to alleviate the technical problem of cryogenic liquid leaking from the main barrier wall splashing onto the hull.

[0005] In a first aspect, an embodiment of the present invention provides a liquid cargo tank, the liquid cargo tank comprising: a tank body, a thermal insulation layer and a secondary shielding structure, the thermal insulation layer is wrapped around the outside of the tank body, and there is a gap between the two;

[0006] The secondary shielding structure is located in the gap and below the cabin;

[0007] The secondary shielding structure is provided with a liquid inlet communicated with the gap, and the liquid inlet is used to allow the liquid in the gap to flow into the secondary shielding structure.

[0008] Further, the secondary shielding structure includes a secondary shielding bottom plate, a secondary shielding rear end wall, a secondary shielding front end wall and a secondary shielding top plate, wherein the secondary shielding rear end wall and the secondary shielding front end wall are respectively connected to opposite ends on the same side of the secondary shielding bottom plate, and the secondary shielding top plate is connected to an end of the secondary shielding rear end wall away from the secondary shielding bottom plate;

[0009] The secondary shielding top plate is connected to the side wall of the cabin body, and the secondary shielding front end wall is connected to the bottom wall of the cabin body, so that the secondary shielding bottom plate, the secondary shielding rear end wall, the secondary shielding front end wall, the secondary shielding top plate, the side wall of the cabin body and the bottom wall of the cabin body form a liquid leakage cavity;

[0010] The secondary shielding top plate and the secondary shielding front end wall are both provided with liquid inlets.

[0011] Furthermore, reinforcing ribs are provided on the outer side of the secondary shielding structure, and the reinforcing ribs include a reinforced bottom, a reinforced rear end, a reinforced front end and a reinforced top which are connected in sequence, and the reinforced bottom, reinforced rear end, reinforced front end and reinforced top are respectively connected to the secondary shielding bottom plate, secondary shielding rear end wall, secondary shielding front end wall and secondary shielding top plate respectively, and the reinforced front end and reinforced top are respectively connected to the bottom wall and side wall of the cabin.

[0012] Furthermore, there are multiple reinforcing ribs, and the multiple reinforcing ribs are arranged in sequence along the length direction of the secondary shielding structure.

[0013] Furthermore, a splash screen is provided on the inner wall of the thermal insulation layer to prevent the leaked liquid from directly contacting the thermal insulation layer.

[0014] Furthermore, the outer side of the thermal insulation layer is wrapped with a protective layer.

[0015] Furthermore, the secondary shielding structure is provided with an air-permeable pipe communicating with the inside and outside thereof.

[0016] Furthermore, an outwardly recessed avoidance groove is provided on the inner side of the thermal insulation layer, and the avoidance groove is used to accommodate the secondary shielding structure.

[0017] Furthermore, the secondary shielding structure and the cabin body are welded into an integral structure.

[0018] In a second aspect, an embodiment of the present invention provides a hull, wherein the hull includes the above-mentioned liquid cargo tank.

[0019] The liquid cargo tank provided in the embodiment of the present invention comprises: a tank body, an insulation layer and a secondary shielding structure, wherein the insulation layer is wrapped around the outside of the tank body, and there is a gap between the two; the secondary shielding structure is located in the gap and is located below the tank body; the secondary shielding structure has a liquid inlet connected to the gap, and the liquid inlet is used to allow the liquid in the gap to flow into the secondary shielding structure. The secondary shielding structure in this solution is located in the gap between the tank body and the insulation layer, and the liquid cargo tank adopts a closed secondary shielding structure. The cryogenic liquid leaking from the tank body will flow into the secondary shielding structure along the gap between the tank body and the insulation layer, thereby preventing the cryogenic liquid leaking from the liquid cargo tank from splashing onto the hull, eliminating the hidden danger of the hull structure being damaged by low temperature, and improving the safety of the hull.

[0020] The hull provided by the embodiment of the present invention includes the above-mentioned liquid cargo tank. Since the hull provided by the embodiment of the present invention uses the above-mentioned liquid cargo tank, the hull provided by the embodiment of the present invention also has the advantages of the liquid cargo tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 A schematic cross-sectional view of a liquid cargo tank provided by an embodiment of the present invention;

[0023] Figure 2 A schematic longitudinal section diagram of a liquid cargo tank provided by an embodiment of the present invention;

[0024] Figure 3 for Figure 1 Partial cross-sectional view along the AA direction;

[0025] Figure 4 A schematic diagram of a gap between a rear end wall of a secondary shield and a thermal insulation layer provided in an embodiment of the present invention;

[0026] Figure 5 A schematic diagram of the gap between the secondary shielding bottom plate and the thermal insulation layer provided in an embodiment of the present invention.

[0027] Icons: 100-hull; 110-rear side wall; 120-bottom wall; 200-insulation layer; 300-secondary shielding structure; 310-secondary shielding bottom plate; 320-secondary shielding rear end wall; 330-secondary shielding front end wall; 340-secondary shielding top plate; 350-liquid inlet; 400-reinforcement rib; 500-splash screen; 600-protective layer; 700-ventilation pipe; 810-hull; 820-pad. DETAILED DESCRIPTION

[0028] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] In the description of the present invention, it should be noted that, if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, if the terms "first", "second", "third" appear, they are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0030] In addition, in the description of the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] like Figure 1-Figure 5 As shown, the liquid cargo tank provided by the embodiment of the present invention comprises a tank 100, an insulation layer 200 and a secondary shielding structure 300, wherein the insulation layer 200 is wrapped around the outer side of the tank 100, and there is a gap between the two; the secondary shielding structure 300 is located in the gap and is located below the tank 100; the secondary shielding structure 300 has a liquid inlet 350 connected to the gap, and the liquid inlet 350 is used to allow the liquid in the gap to flow into the secondary shielding structure 300. In this solution, the secondary shielding structure 300 is located in the gap between the tank 100 and the insulation layer 200, and the liquid cargo tank adopts a closed secondary shielding structure 300. The cryogenic liquid leaking from the tank 100 will flow into the secondary shielding structure 300 along the gap between the tank 100 and the insulation layer 200, thereby preventing the cryogenic liquid leaking from the liquid cargo tank from splashing onto the hull 810, eliminating the hidden danger of the hull 810 structure being damaged by low temperature, and improving the safety of the hull 810.

[0032] In this embodiment, the secondary shielding structure 300 is located inside the insulation layer 200, and the liquid cargo tank can be directly installed in the hull 810 after being formed. Therefore, there is no need to set the insulation layer 200 on the hull 810, thereby reducing the production and construction costs of the shipyard.

[0033] The secondary shielding structure 300 includes a secondary shielding bottom plate 310, a secondary shielding rear end wall 320, a secondary shielding front end wall 330 and a secondary shielding top plate 340, wherein the secondary shielding rear end wall 320 and the secondary shielding front end wall 330 are respectively connected to opposite ends on the same side of the secondary shielding bottom plate 310, and the secondary shielding top plate 340 is connected to an end of the secondary shielding rear end wall 320 away from the secondary shielding bottom plate 310; the secondary shielding top plate 340 is connected to the side wall of the cabin 100, and the secondary shielding front end wall 330 is connected to the bottom wall 120 of the cabin 100, so that the secondary shielding bottom plate 310, the secondary shielding rear end wall 320, the secondary shielding front end wall 330, the secondary shielding top plate 340, the side wall of the cabin 100 and the bottom wall 120 of the cabin 100 form a liquid leakage cavity; the secondary shielding top plate 340 and the secondary shielding front end wall 330 are both provided with a liquid inlet 350.

[0034] The secondary shielding structure 300 may be in a "C" shape and arranged at the corner between the rear side wall 110 and the bottom wall 120 of the cabin 100. The secondary shielding structure 300 may extend along the width direction of the cabin 100. The secondary shielding structure 300 may also be arranged at the corner between the other side walls of the cabin 100 and the bottom wall 120. The secondary shielding rear end wall 320 and the secondary shielding front end wall 330 are respectively vertically connected to the opposite ends of the same side of the secondary shielding bottom plate 310, and the secondary shielding top plate 340 is vertically connected to the end of the secondary shielding rear end wall 320 away from the secondary shielding bottom plate 310 and is parallel to the secondary shielding bottom plate 310. The secondary shielding bottom plate 310 is lower than the bottom wall 120 of the cabin 100. The secondary shielding top plate 340 may be welded to the rear side wall 110 of the cabin 100, and the secondary shielding front end wall 330 is welded to the bottom wall 120 of the cabin 100. The secondary shielding top plate 340 and the secondary shielding front end wall 330 are both provided with a liquid inlet 350. The liquid remaining from the gap between the rear side wall 110 of the cabin body 100 and the insulation layer 200 from top to bottom can flow into the secondary shielding structure 300 from the liquid inlet 350 on the secondary shielding top plate 340, and the liquid that has flowed into the gap between the bottom wall 120 of the cabin body 100 and the insulation layer 200 can flow into the secondary shielding structure 300 from the liquid inlet 350 on the secondary shielding front end wall 330.

[0035] The height of the secondary shielding top plate 340 and the secondary shielding front end wall 330 is between 0.1 and 1 meters, and the length of the secondary shielding bottom plate 310 is between 1 and 3 meters.

[0036] Reinforcing ribs 400 are provided on the outer side of the secondary shielding structure 300, and the reinforcing ribs 400 include a reinforced bottom, a reinforced rear end, a reinforced front end and a reinforced top which are connected in sequence, and the reinforced bottom, the reinforced rear end, the reinforced front end and the reinforced top are respectively connected to the secondary shielding bottom plate 310, the secondary shielding rear end wall 320, the secondary shielding front end wall 330 and the secondary shielding top plate 340, and the reinforced front end and the reinforced top are respectively connected to the bottom wall 120 and the side wall of the cabin 100.

[0037] The reinforcing ribs 400 are welded to the secondary shielding structure 300 and the cabin 100 respectively, and can play a role in supporting and reinforcing. Because the secondary shielding structure 300 is located at the bottom of the cabin 100, the structure of the reinforcing ribs 400 is consistent with the shape of the cross section of the secondary shielding structure 300. The reinforcing bottom, the reinforcing rear end, the reinforcing front end and the reinforcing top are respectively welded to the secondary shielding bottom plate 310, the secondary shielding rear end wall 320, the secondary shielding front end wall 330 and the secondary shielding top plate 340. The reinforcing ribs 400 can improve the structural stability of the secondary shielding structure 300 and prevent the secondary shielding structure 300 from deformation. The height of the reinforcing ribs is between 0.05-0.1 meters.

[0038] There are multiple reinforcing ribs 400, and the multiple reinforcing ribs 400 are sequentially arranged along the length direction of the secondary shielding structure 300. The multiple reinforcing ribs 400 can jointly support the secondary shielding structure 300 at multiple positions to play a role of stable support.

[0039] A splash screen 500 is provided on the inner wall of the thermal insulation layer 200 to prevent the leaked liquid from directly contacting the thermal insulation layer 200 .

[0040] The splash screen 500 can be located on the circumferential side wall and bottom surface of the insulation layer 200 to prevent the cryogenic liquid from directly contacting the insulation layer 200 , and the friction coefficient of the splash screen 500 can be smaller than the friction coefficient of the insulation layer 200 , so that the liquid can flow smoothly along the splash screen 500 .

[0041] The splash screen 500 may be made of stainless steel.

[0042] The outer side of the thermal insulation layer 200 is wrapped with a protective layer 600. The protective layer 600 can protect the thermal insulation layer 200 on the one hand, and on the other hand, the thermal insulation layer 200 can further prevent liquid from passing through the thermal insulation layer 200 and flowing into the hull 810.

[0043] The material of the protective layer 600 may be galvanized iron sheet.

[0044] The secondary shielding structure 300 is provided with a ventilation pipe 700 communicating with the inside and outside thereof. The ventilation pipe 700 can be arranged on the secondary shielding bottom plate 310 and can be connected to the ventilation mast of the main hull 810 to prevent the liquid in the secondary shielding structure from evaporating and generating overpressure.

[0045] The inner side of the thermal insulation layer 200 is provided with an outwardly recessed avoidance groove, and the avoidance groove is used to accommodate the secondary shielding structure 300 .

[0046] An avoidance groove is provided on the insulation layer 200 for accommodating the secondary shielding structure 300, which can make the overall external structure of the liquid cargo tank more uniform. At the same time, the secondary shielding structure 300 can be located at a lower position to help the liquid flow into the secondary shielding structure 300.

[0047] The hull 810 provided in the embodiment of the present invention includes the above-mentioned liquid cargo tank. Since the hull 810 provided in the embodiment of the present invention uses the above-mentioned liquid cargo tank, the hull 810 provided in the embodiment of the present invention also has the advantages of the liquid cargo tank.

[0048] The liquid cargo tank is installed in the hull 810 , and a cushion block 820 is provided between the liquid cargo tank and the hull 810 . The cushion block 820 is used to support the liquid cargo tank so that there is a certain gap between the liquid cargo tank and the bottom of the hull 810 .

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A liquid cargo tank, characterized in that: The liquid cargo tank comprises: a tank body (100), a thermal insulation layer (200) and a secondary shielding structure (300), wherein the thermal insulation layer (200) is wrapped around the outer side of the tank body (100) with a gap therebetween; The secondary shielding structure (300) is located in the gap and below the cabin (100); The secondary shielding structure (300) is provided with a liquid inlet (350) which is in communication with the gap, and the liquid inlet (350) is used to allow the liquid in the gap to flow into the secondary shielding structure (300); The secondary shielding structure (300) comprises a secondary shielding bottom plate (310), a secondary shielding rear end wall (320), a secondary shielding front end wall (330) and a secondary shielding top plate (340), wherein the secondary shielding rear end wall (320) and the secondary shielding front end wall (330) are respectively connected to opposite ends of the same side of the secondary shielding bottom plate (310), and the secondary shielding top plate (340) is connected to an end of the secondary shielding rear end wall (320) away from the secondary shielding bottom plate (310); The secondary shielding top plate (340) is connected to the side wall of the cabin (100), and the secondary shielding front end wall (330) is connected to the bottom wall (120) of the cabin (100), so that the secondary shielding bottom plate (310), the secondary shielding rear end wall (320), the secondary shielding front end wall (330), the secondary shielding top plate (340), the side wall of the cabin (100) and the bottom wall (120) of the cabin (100) form a liquid leakage cavity; The secondary shielding top plate (340) and the secondary shielding front end wall (330) are both provided with a liquid inlet (350); The secondary shielding structure (300) is arranged at a corner between a side wall and a bottom wall (120) of the cabin body (100); An outwardly recessed avoidance groove is provided on the inner side of the thermal insulation layer (200), and the avoidance groove is used to accommodate the secondary shielding structure (300).

2. The liquid cargo tank according to claim 1, characterized in that: A reinforcing rib (400) is provided on the outer side of the secondary shielding structure (300), and the reinforcing rib (400) includes a reinforcing bottom, a reinforcing rear end, a reinforcing front end and a reinforcing top which are connected in sequence, and the reinforcing bottom, the reinforcing rear end, the reinforcing front end and the reinforcing top are respectively connected to the secondary shielding bottom plate (310), the secondary shielding rear end wall (320), the secondary shielding front end wall (330) and the secondary shielding top plate (340), and the reinforcing front end and the reinforcing top are respectively connected to the bottom wall (120) and the side wall of the cabin (100).

3. The liquid cargo tank according to claim 2, characterized in that: The number of the reinforcing ribs (400) is plural, and the plurality of reinforcing ribs (400) are arranged in sequence along the length direction of the secondary shielding structure (300).

4. The liquid cargo tank according to claim 1, characterized in that: An anti-splash screen (500) is provided on the inner wall of the thermal insulation layer (200) to prevent leaked liquid from directly contacting the thermal insulation layer (200).

5. The liquid cargo tank according to claim 1, characterized in that: The outer side of the thermal insulation layer (200) is wrapped with a protective layer (600).

6. The liquid cargo tank according to claim 1, characterized in that: The secondary shielding structure (300) is provided with a vent pipe (700) communicating the inside and outside thereof.

7. The liquid cargo tank according to claim 1, characterized in that: The secondary shielding structure (300) and the cabin body (100) are welded into an integrated structure.

8. A hull (810), characterized in that: The hull (810) includes the liquid cargo tank according to any one of claims 1-7.

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