Marine liquid tank

Abstract

The present invention provides a marine liquid tank, which includes a tank body, a tank body connection location and a sandwich pipeline. The tank body includes an inner tank for storing cryogenic liquid and an outer tank covering the outside of the inner tank, and an insulating sandwich is formed between the inner tank and the outer tank. The tank body connection location includes an outer shell and a connecting pipeline fixed in the outer shell. The outer shell is arranged on the outer peripheral side wall of the outer tank and extends along the axial direction of the outer tank. A hollow receiving cavity is enclosed between the outer shell and the outer tank. The sandwich pipeline includes a plurality of pipe sections that are bent and connected in sequence. The inner end of the sandwich pipeline is connected to the inner tank, and the outer end of the sandwich pipeline passes through the outer tank and extends into the receiving cavity to connect with the connecting pipeline. The tank body connection location is arranged on the side wall of the outer tank, which makes full use of the space in the width direction of the hull without occupying the space in the length direction required for the installation of the tank body, thereby increasing the loading volume of the tank body and ensuring the endurance of the ship's operation at sea.

Description

Technical Field

[0001] The invention relates to the technical field of marine transport tanks, in particular to a marine liquid tank. Background Art

[0002] At present, in order to cope with increasingly severe environmental challenges and reduce sulfur oxide emissions in pollution emission control areas, the International Maritime Organization (IMO) has introduced a series of regulations to control environmental pollution. Natural gas, as a clean energy, is more economical than traditional fuels such as diesel. Therefore, LNG (liquefied natural gas) fuel-powered ships have developed rapidly in recent years.

[0003] Marine LNG fuel tanks usually use vacuum horizontal containers, with the tank connection space (TCS) located at the rear of the tank, and the sandwich pipes between the inner tank and the outer tank are arranged between the inner head and the outer head. This solution is widely used and has a mature manufacturing process. However, if the space in the length direction of the hull is relatively limited and the space in the width direction is relatively abundant, this solution cannot make full use of the space on the hull, resulting in a significant reduction in the volume of the LNG fuel tank loaded on the ship, which in turn leads to an increase in the frequency of refueling for short-distance ships and a reduction in the single voyage distance of long-distance ships. Summary of the invention

[0004] The object of the present invention is to provide a marine liquid tank to solve the problem in the prior art that the arrangement of the fuel tank is limited by the length space of the hull, resulting in a reduced volume.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A marine liquid tank comprises: a tank body, which comprises an inner tank for storing cryogenic liquid and an outer tank covering the outside of the inner tank, an insulating interlayer being formed between the inner tank and the outer tank; a tank body connection part, which comprises an outer shell and a connecting pipeline fixed in the outer shell; the outer shell is located at the side of the outer tank and extends along the axial direction of the outer tank, the outer shell is arranged in the middle area along the axial direction of the outer tank, and a hollow receiving cavity is enclosed between the outer shell and the outer tank; an interlayer pipeline comprises a plurality of pipe sections that are bent and connected in sequence and are located in the insulating interlayer, the inner end of the interlayer pipeline is communicated with the inner tank, and the outer end of the interlayer pipeline passes through the outer tank and extends into the receiving cavity to be connected with the connecting pipeline.

[0007] According to an embodiment of the present invention, the shell is located on one side of the central axis of the tank body in the transverse direction of the tank body.

[0008] According to one embodiment of the present invention, the lower end of the outer shell exceeds the lowest point of the outer tank, and the upper end of the outer shell exceeds the middle of the outer tank.

[0009] According to one embodiment of the present invention, the outer shell includes a top plate, an outer enclosure plate, a bottom plate and a bottom side plate which are connected in sequence; the top plate and the bottom plate are horizontally spaced, the top plate is axially located between the top and the middle of the outer tank, and is connected and fixed to the outer wall of the outer tank, the bottom side plate is arranged at the bottom of the outer tank, and the bottom plate is connected and fixed to the outer tank through the bottom side plate so as to be located below the lowest point of the outer tank; the outer enclosure plate is located on the outside of the outer tank, and is respectively connected to the top plate, the bottom plate and the outer wall of the outer tank, thereby enclosing and forming a sealed receiving cavity.

[0010] According to one embodiment of the present invention, the bottom side plate is vertically arranged along a central vertical axis where the lowest point of the outer tank is located.

[0011] According to one embodiment of the present invention, the multiple pipe segments include multiple axial pipe segments and multiple transition pipe segments; the multiple axial pipe segments are spaced and staggered, each axial pipe segment is parallel to the axial direction of the tank body, and both ends of each transition pipe segment are respectively connected to two adjacent axial pipe segments by bending.

[0012] According to an embodiment of the present invention, the sandwich pipeline further includes a plurality of reinforcement members; each reinforcement member is correspondingly arranged at a connection between two adjacent pipe sections.

[0013] According to one embodiment of the present invention, the outer tank includes a cylinder and two heads respectively arranged at two axial ends of the cylinder; the outer shell is connected to the cylinder, and there is a distance between the two axial ends of the outer shell and the two heads respectively.

[0014] According to one embodiment of the present invention, the marine liquid tank further comprises two saddles spaced apart along the axial direction of the tank body, each of the saddles being supported at the bottom of the cylinder of the outer tank; and the outer shell is disposed between the two saddles along the axial direction of the tank body.

[0015] According to one embodiment of the present invention, the marine liquid tank also includes two groups of support structures arranged in the insulating interlayer to connect the inner tank and the outer tank, and the two groups of support structures are distributed at intervals along the axial direction of the tank body; each group of the support structures includes a plurality of support tube groups distributed circumferentially along the same cross-section of the tank body, wherein the center angle between any two adjacent support tube groups located at the lower part of the tank body is smaller than the center angle between two adjacent support tube groups located at the upper part of the tank body.

[0016] It can be seen from the above technical solutions that the marine liquid tank provided by the present invention has at least the following advantages and positive effects:

[0017] 1. The tank connection is located on the side wall of the outer tank. Compared with the arrangement at the tail of the tank, it makes full use of the space in the width direction of the hull without occupying the space in the length direction required for the installation of the tank, thereby increasing the loading volume of the tank and ensuring the endurance of the ship at sea.

[0018] 2. The sandwich pipeline includes multiple pipe sections connected by bends. The bend design can alleviate the shear force on the pipeline when the inner and outer tanks undergo relative axial displacement due to temperature difference stress, avoid deformation and damage of the sandwich pipeline due to excessive pulling, improve the stress state of the pipeline, ensure the normal use of the pipeline and prevent LNG leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of a horizontal placement of a marine liquid tank in an embodiment of the present invention.

[0020] Figure 2 It is a schematic cross-sectional view of a marine liquid tank in an embodiment of the present invention.

[0021] Figure 3 for Figure 1 Enlarged view of point A.

[0022] Figure 4 for Figure 1 Enlarged view of point B.

[0023] The reference numerals are as follows: 1-tank body, 11-outer tank, 12-inner tank, 13-insulating interlayer, 111-cylinder body, 113-head, 15-saddle, 2-tank body connection place, 21-outer shell, 211-top plate, 213-outer enclosure, 2131-plate body, 2133-enclosure, 215-bottom plate, 217-bottom side plate, 23-connecting pipeline, 25-airtight door, 3-interlayer pipeline, 31-pipe section, 31a-axial pipe section, 31b-transition pipe section, 4-support structure, 41-support pipe group, 411-outer tank fixing pipe, 413-inner tank fixing pipe, 415-support pipe. DETAILED DESCRIPTION

[0024] Typical embodiments that embody the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention can have various changes in different embodiments without departing from the scope of the present invention, and the descriptions and illustrations therein are essentially used for illustration purposes rather than for limiting the present invention.

[0025] This embodiment provides a marine liquid tank, which is a marine equipment integrating an LNG liquid tank and a tank body connection location.

[0026] The tank connection space (TCS) is located on the outer peripheral side wall of the LNG liquid tank, which makes full use of the space in the width direction of the hull without occupying the space in the length direction required for the tank installation, thereby increasing the loading volume of the tank. It is especially suitable for ships with more room in the width direction of the hull, expanding the scope of application and ensuring that the marine ships have sufficient endurance.

[0027] The marine liquid tank includes a tank body, a tank body connection location and a sandwich pipeline. The tank body includes an inner tank for storing cryogenic liquid and an outer tank covering the outside of the inner tank, and an insulating sandwich is formed between the inner tank and the outer tank. The tank body connection location includes an outer shell and a connecting pipeline fixed in the outer shell. The outer shell is arranged on the outer peripheral side wall of the outer tank and extends along the axial direction of the outer tank. A hollow receiving cavity is enclosed between the outer shell and the outer tank. The sandwich pipeline includes a plurality of pipe sections that are bent and connected in sequence. The inner end of the sandwich pipeline is connected to the inner tank, and the outer end of the sandwich pipeline passes through the outer tank and extends into the receiving cavity to connect with the connecting pipeline.

[0028] Please refer to Figure 1 , Figure 1 The specific structure of a marine liquid tank provided in this embodiment is shown, which includes a tank body 1, a tank body connection location 2 arranged on the tank body 1, and an interlayer pipeline 3 arranged in the tank body interlayer.

[0029] The tank body 1 includes an inner tank 12 for storing cryogenic liquid LNG, an outer tank 11 covering the outer portion of the inner tank 12 , and two saddles 15 arranged opposite to each other. An insulating interlayer 13 is formed between the inner tank 12 and the outer tank 11 .

[0030] When the tank body 1 is installed horizontally on the hull, the axial direction of the tank body 1 is consistent with the length direction of the hull, and the transverse direction of the tank body 1 is consistent with the width direction of the hull. The outer tank 11 and the inner tank 12 each include a cylinder 111 and two heads 113 respectively arranged at both ends of the cylinder 111 in the axial direction. Two saddles 15 are spaced apart along the axial direction of the tank body 1 to support the bottom of the cylinder 111 arranged on the outer tank 11.

[0031] The tank connection location 2 is arranged on the side wall of the tank body 1. Specifically, the tank connection location 2 mainly includes an outer shell 21 and a connecting pipeline 23 fixed in the outer shell 21 for supplying gas to the power system of the ship. Among them, the outer shell 21 covers the outer peripheral side wall of the outer tank 11 and extends along the axial direction of the outer tank 11. The outer shell 21 is located on one side of the central axis of the tank body 1 in the transverse direction of the tank body 1. A hollow receiving cavity is enclosed between the outer shell 21 and the outer tank 11. The receiving cavity is for the outer end of the interlayer pipeline 3 to extend into and dock with the connecting pipeline 23. Its purpose is to serve as an emergency LNG storage space when LNG leaks. The outer shell 21 is also provided with an airtight door 25 for workers to enter and exit. In this embodiment, the connection location of the tank body 1 also includes various equipment such as instruments, electrical equipment, ventilation equipment, etc. arranged in the receiving cavity.

[0032] Different from the traditional design in which the TCS is arranged at the tail of the tank body 1 at the head 113, the TCS in the present embodiment is arranged on the side of the tank body 1, which can make full use of the space in the width direction of the hull without occupying the space in the length direction required for the installation of the tank body 1. The tank body 1 can be extended and expanded as much as possible along the length direction of the hull, thereby maximizing the volume of the tank body 1, increasing the loading capacity of the tank body 1, and ensuring that the marine vessel has sufficient endurance.

[0033] Furthermore, the outer shell 21 is disposed in the middle area of ​​the outer tank 11 along the axial direction, that is, disposed between the two saddles 15 along the axial direction, so as to have a distance between the two heads 113 of the outer tank 11 respectively.

[0034] At the same time, the outer shell 21 is symmetrically arranged relative to the central axis of the outer tank 11. In this way, the center of gravity of the tank body 1 is balanced as much as possible to ensure the stability of the tank body 1 during the operation of the ship.

[0035] Please combine Figure 2 The lower end of the outer shell 21 exceeds the lowest point of the outer tank 11, and the upper end of the outer shell 21 exceeds the middle of the outer tank 11 to cover the connecting part on the outer tank 11 as much as possible.

[0036] Specifically, the outer shell 21 includes a top plate 211, an outer enclosure 213, a bottom plate 215 and a bottom side plate 217 which are connected in sequence. The top plate 211 and the bottom plate 215 are horizontally spaced up and down. The top plate 211 is axially located between the top and the middle of the outer tank 11, and is connected and fixed to the outer wall of the outer tank 11. The bottom side plate 217 is arranged at the bottom of the outer tank 11, and the bottom plate 215 is connected and fixed to the outer tank 11 through the bottom side plate 217 to be located below the lowest point of the outer tank 11. The outer enclosure 213 is located on the outside of the outer tank 11, and is respectively connected to the top plate 211, the bottom plate 215 and the outer wall of the outer tank 11, so as to enclose and form a sealed receiving chamber.

[0037] The outer enclosure 213 includes a plate body 2131 and two enclosures 2133 bent and relatively protruding from both sides of the plate body 2131, wherein the upper and lower ends of the plate body 2131 and the two enclosures 2133 are welded and fixed to the top plate 211 and the bottom plate 215 respectively. One end of the two enclosures 2133 away from the plate body 2131 is welded and fixed to the outer side wall of the outer tank 11. In this embodiment, the angle between the plate body 2131 and the enclosure 2133 is 90 degrees, and the enclosure 2133 is vertically connected to the side wall of the outer tank 11. Of course, the above angle can be adaptively changed according to the use requirements.

[0038] Please refer again Figure 1 The sandwich pipeline 3 includes a plurality of pipe sections 31 that are bent and connected in sequence in the heat-insulating sandwich 13. The inner end of the sandwich pipeline 3 is connected to the inner tank 12, and the outer end of the sandwich pipeline 3 passes through the outer tank 11 and extends into the receiving cavity to connect with the connecting pipeline 23.

[0039] Since LNG is a cryogenic liquid, the lowest storage temperature is -163°C. The temperature of the inner tank 12 storing LNG changes greatly during frequent loading and unloading, which generates large temperature difference stress, causing the inner tank 12 structure to shrink, and then axial displacement relative to the outer tank 11. One end of the sandwich pipeline 3 is connected to the inner tank 12, and the other end is connected to the outer tank 11. The pipeline is stretched at an angle under this working condition, and is easily twisted and deformed due to shear stress. Once the pipeline is damaged, it is easy to leak, causing safety accidents.

[0040] Therefore, the bending design of the above-mentioned sandwich pipeline 3 can alleviate the shear force on the pipeline when the inner and outer tanks 11 undergo axial relative displacement due to temperature difference stress, avoid deformation, damage and other problems caused by excessive pulling of the sandwich pipeline 3, improve the stress state of the pipeline, ensure the normal use of the pipeline and ensure that LNG does not leak.

[0041] Specifically, the multiple pipe segments 31 include multiple axial pipe segments 31a and multiple transition pipe segments 31b. The multiple axial pipe segments 31a are arranged at intervals and staggered, each axial pipe segment 31a is parallel to the axial direction of the tank body 1, and the two ends of each transition pipe segment 31b are respectively connected to the two adjacent axial pipe segments 31a by bending. Finally, the structure enclosed by the multiple axial pipe segments 31a and the multiple transition pipe segments 31b is U-shaped or S-shaped in the longitudinal cross-section of the tank body 1. In addition, the sandwich pipeline 3 also includes multiple reinforcements, each reinforcement is correspondingly arranged at the connection between the two adjacent axial pipe segments 31a and the transition pipe segment 31b to improve the connection strength.

[0042] The marine liquid tank further comprises two sets of supporting structures 4 arranged in the heat-insulating interlayer 13 for connecting the inner tank 12 and the outer tank 11 .

[0043] The two groups of support structures 4 are distributed at intervals along the axial direction of the tank body 1, and each group of support structures 4 includes a plurality of support tube groups 41 distributed circumferentially along the same cross-section of the tank body 1, wherein the center angle between any two adjacent support tube groups 41 located at the lower part of the tank body 1 is smaller than the center angle between the two support tube groups 41 located at the upper part of the tank body 1.

[0044] like Figure 2 There are six support tube groups 41 located at the lower part of the tank body 1, and the six support tube groups 41 are evenly distributed, and the included angle of the center of the circle is 30 degrees. Of course, in other embodiments, the number of support tube groups 41 is not limited, and arranging as many support tube groups 41 as possible under the tank body 1 can alleviate the problem of excessive lateral stress caused by the deviation of the center of gravity after the TCS side is arranged.

[0045] Please refer to Figure 3The cross-sectional view of the support tube group 41 is shown, wherein each support tube group 41 located at one end of the tank body 1 in the axial direction includes: an outer tank fixing tube 411 protruding from the inner peripheral wall of the outer tank 11, an inner tank fixing tube 413 protruding from the outer peripheral wall of the inner tank 12, and a support tube 415. The openings of the two fixing tubes are opposite, and the support tubes 415 are respectively fixed and clamped in the outer tank fixing tube 411 and the inner tank fixing tube 413 to form a support fixing end between the inner tank 12 and the outer tank 11.

[0046] Please refer to further Figure 4 , each support tube group 41 located at the other axial end of the tank body 1 includes: an outer tank fixing tube 411 protruding from the inner peripheral wall of the outer tank 11 and a support tube 415. One end of the support tube 415 is connected and fixed to the outer peripheral wall of the inner tank 12. The other end extends into the outer tank fixing tube 411 and can slide axially relative to the outer tank fixing tube 411 to form a support sliding end between the inner tank 12 and the outer tank 11. The function of the support sliding end is to allow the inner tank 12 to move toward the fixed end when the inner tank 12 is subjected to low temperature contraction.

[0047] In summary, the marine liquid tank provided by the present invention has at least the following advantages and positive effects:

[0048] Firstly, the tank connection part 2 is arranged on the side wall of the outer tank 11. Compared with the arrangement scheme of being arranged at the tail of the tank 1, it makes full use of the space in the width direction of the hull without occupying the space in the length direction required for the installation of the tank 1, thereby increasing the loading volume of the tank 1 and ensuring the endurance of the ship's operation at sea.

[0049] Secondly, the outer shell 21 of the tank body connection part 2 is arranged in the middle area of ​​the outer tank 11 along the axial direction, that is, between the two saddles 15, so as to have a distance between the two heads 113 of the outer tank 11. At the same time, the outer shell 21 is symmetrically arranged relative to the middle axis of the outer tank 11; in this way, the center of gravity of the tank body 1 is balanced as much as possible to ensure the stability of the tank body 1 during the operation of the ship.

[0050] Then, the sandwich pipeline 3 includes multiple pipe sections 31 connected by bends. The bend design can alleviate the shear force on the pipeline when the inner and outer tanks 11 undergo axial relative displacement due to temperature difference stress, avoid deformation and damage of the sandwich pipeline 3 due to excessive pulling, improve the stress state of the pipeline, ensure the normal use of the pipeline and ensure that LNG does not leak.

[0051] Although the present invention has been described with reference to several typical embodiments, it should be understood that the terms used are illustrative and exemplary, rather than restrictive. Since the present invention can be embodied in a variety of forms without departing from the spirit or essence of the invention, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be interpreted broadly within the spirit and scope defined by the appended claims, so all changes and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. A marine liquid tank, characterized in that: include: A tank body, comprising an inner tank for storing cryogenic liquid and an outer tank covering the inner tank, wherein a heat insulating interlayer is formed between the inner tank and the outer tank; the tank body is horizontally installed on the hull; The tank body connection part includes an outer shell and a connecting pipeline fixed in the outer shell; the outer shell is located at the side of the outer tank and extends along the axial direction of the outer tank, the outer shell is arranged in the middle area of ​​the axial direction of the outer tank, and a hollow receiving chamber is enclosed between the outer shell and the outer tank; the lower end of the outer shell exceeds the lowest point of the outer tank, and the upper end of the outer shell exceeds the middle part of the outer tank; the outer shell includes a top plate, an outer side plate, a bottom plate and a bottom side plate connected in sequence; the top plate and the bottom plate are horizontally spaced, the top plate is axially located between the top and the middle part of the outer tank, and is connected and fixed to the outer wall of the outer tank, the bottom side plate is arranged at the bottom of the outer tank, and the bottom plate is connected and fixed to the outer tank through the bottom side plate so as to be located below the lowest point of the outer tank; the outer side plate is located on the outside of the outer tank, and is respectively connected to the top plate, the bottom plate and the outer wall of the outer tank, so as to enclose a sealed receiving chamber; The sandwich pipeline comprises a plurality of pipe sections which are bent and connected in sequence and are located in the thermal insulation sandwich. The inner end of the sandwich pipeline is connected to the inner tank, and the outer end of the sandwich pipeline passes through the outer tank and extends into the receiving cavity to be connected to the connecting pipeline.

2. The marine liquid tank according to claim 1, characterized in that: The shell is located on one side of the central axis of the tank body in the transverse direction of the tank body.

3. The marine liquid tank according to claim 1, characterized in that: The bottom side plate is vertically arranged along a central vertical axis where the lowest point of the outer tank is located.

4. The marine liquid tank according to claim 1, characterized in that: The plurality of pipe segments include a plurality of axial pipe segments and a plurality of transition pipe segments; The plurality of axial pipe segments are arranged at intervals and in a staggered manner, each of the axial pipe segments is parallel to the axial direction of the tank body, and both ends of each transition pipe segment are respectively connected to two adjacent axial pipe segments by bending.

5. The marine liquid tank according to claim 1, characterized in that: The sandwich pipeline also includes a plurality of reinforcement members; Each reinforcement member is correspondingly arranged at the connection between two adjacent pipe sections.

6. The marine liquid tank according to claim 1, characterized in that: The outer tank comprises a cylinder and two heads respectively arranged at two axial ends of the cylinder; The shell is connected to the cylinder, and there is a distance between the two ends of the shell in the axial direction and the two heads respectively.

7. The marine liquid tank according to claim 6, characterized in that: The marine liquid tank also includes two saddles spaced apart along the axial direction of the tank body, each of the saddles being supported and arranged at the bottom of the cylinder of the outer tank; The shell is arranged between the two saddles in the axial direction of the tank body.

8. The marine liquid tank according to claim 1, characterized in that: The marine liquid tank also includes two groups of support structures arranged in the thermal insulation interlayer to connect the inner tank and the outer tank, and the two groups of support structures are spaced apart along the axial direction of the tank body; Each group of the support structures includes a plurality of support tube groups distributed circumferentially along the same cross section of the tank body, wherein the center angle between any two adjacent support tube groups located at the lower part of the tank body is smaller than the center angle between any two adjacent support tube groups located at the upper part of the tank body.

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