Low temperature storage cargo tank structure and ship

Abstract

The present application provides a cryogenic cargo tank structure and a ship, including a first tank body, a second tank body, and a first isolation layer. The second tank body is installed inside the first tank body, and the housing of the second tank body divides the interior of the first tank body into two independent spaces (a first space and a second space) capable of storing liquid cargo. The second space is located inside the second tank body. The first isolation layer is disposed to surround and cover the exterior of the housing of the second tank body, effectively preventing heat transfer between the two different liquid cargoes stored in the first space and the second space, thereby meeting the need to simultaneously load different types of cryogenic liquid cargoes in the same cargo tank. Furthermore, if the housing of the second tank body is damaged, the first isolation layer can also function as a splash prevention bulkhead to prevent the different liquid cargoes stored in the first space and the second space from mixing with each other.

Description

[Technical Field]

[0001] The present application relates to technical fields related to ship construction, and in particular to cryogenic cargo tank structures and ships. [Background technology]

[0002] Liquefied gas carriers are specialized vessels for transporting various low-temperature liquid cargoes such as liquefied petroleum gas, liquefied natural gas, and green ammonia, and have evolved from small, simple, and simple structures to their current large, complex, and diverse structures. Containment systems are one of the core technologies in the development of liquefied gas carriers, and their main function is to ensure the safety of the liquid cargo inside through the bulkhead layer while also providing excellent thermal insulation.

[0003] Conventional liquefied gas carriers are usually designed with only a single cargo tank and can therefore only carry one type of liquid cargo at a time. Therefore, for missions that require the carrying of different types of liquid cargo, carrying a single cargo tank cannot meet the requirements of the modern liquefied gas carrier market and is not suitable for the economic efficiency of liquid cargo transportation. Moreover, since different liquid cargoes can maintain their liquid state at different temperatures, the first problem to be solved when carrying multiple types of liquid cargo on a liquefied gas carrier is how to prevent heat transfer between the different liquid cargoes.

[0004] Therefore, providing a cryogenic cargo tank structure and a vessel that can meet the loading needs of different types of liquid cargoes has become an urgent problem to be solved in the field. Summary of the Invention

[0005] The objective of the present application is to provide a cryogenic cargo tank structure and a vessel that can meet the loading needs of different types of liquid cargo.

[0006] In a first aspect, the present application provides a cryogenic storage cargo tank structure including a hull and a cargo tank provided within the hull, the cargo tank including a first tank body, a second tank body installed inside the first tank body, and a first isolation layer, a first space portion for storing liquid cargo is formed between the first tank body and the second tank body, the first isolation layer is located within the first space portion and surrounds and covers the second tank body, a second space portion for storing liquid cargo is provided within the second tank body, and the second space portion is not in communication with the first space portion.

[0007] In one embodiment, the housing of the first tank body includes a prismatic airtight structure having a plurality of flat surfaces and a polygonal cross section, and the housing of the second tank body includes a cylindrical airtight structure having a plurality of curved surfaces and a circular cross section.

[0008] In one embodiment, the second tank body includes a longitudinal bulkhead that extends from the bottom to the ceiling of the second tank body and divides the second space into two compartment spaces.

[0009] In one embodiment, the second tank body further includes a plurality of reinforcing rings and a second profile spaced apart along the housing inner wall, the first profile being provided within the first tank body, and the first profile being positioned to correspond to the second profile.

[0010] In one embodiment, the first tank body includes a plurality of horizontal partition walls that extend vertically from the housing inner wall of the first tank body to the first isolation layer and divide the first space portion into a plurality of compartment spaces, and the compartment spaces within the first space portion communicate with each other via a plurality of through holes provided in the horizontal partition walls.

[0011] In one embodiment, the cargo tank further includes a flow passage provided between the first isolation layer and the second tank body and separating the first isolation layer from the second tank body, and a liquid storage tank provided at the bottom of the first tank body, penetrating a bottom housing of the first tank body and communicating with the flow passage.

[0012] In one embodiment, the liquid storage tank includes a plurality of surrounding plates, a plurality of baffles, and a second isolation layer, a rectangular groove-shaped structure is formed by being surrounded by the plurality of surrounding plates and the bottom of the first tank body, the second isolation layer is located at the bottom of the groove-shaped structure, and the plurality of baffles are arranged horizontally above the second isolation layer and are connected vertically to the surrounding plates.

[0013] In one embodiment, the bottom of the cargo tank is further provided with a plurality of support assemblies, each including a support base and a support pad, and the support pad is located on the support base and abuts against the housing outer wall of the first tank body.

[0014] In one embodiment, the support base is formed by joining a plurality of brackets, and a third isolation layer is filled between the brackets.

[0015] In a second aspect, the present application further provides a ship using the cryogenic storage cargo tank structure according to any of the above embodiments. [Effects of the Invention]

[0016] Compared with the prior art, the present application has at least the following beneficial effects:

[0017] The present application provides a cryogenic cargo tank structure and a ship, including a first tank body, a second tank body, and a first isolation layer. The second tank body is installed inside the first tank body, and the housing of the second tank body divides the interior of the first tank body into two independent spaces (a first space and a second space) capable of storing liquid cargo. The second space is located inside the second tank body. The first isolation layer is disposed to surround and cover the exterior of the housing of the second tank body, thereby preventing heat transfer between the two different liquid cargoes stored in the first space and the second space, thereby satisfying the need to simultaneously load different types of cryogenic liquid cargoes in the same cargo tank. Furthermore, if the housing of the second tank body is damaged, the first isolation layer can also function as a splash prevention bulkhead to prevent the different liquid cargoes stored in the first space and the second space from mixing with each other.

[0018] In order to more clearly explain the technical solutions in the embodiments of the present application, the drawings used in the embodiments will be briefly described below, in which it should be understood that the following drawings only illustrate some embodiments of the present application and should not be considered as limiting the scope of protection, and that those skilled in the art can obtain other related drawings based on these drawings without any creative efforts. [Brief explanation of the drawings]

[0019] [Figure 1] 1 is a schematic plan view of a cryogenic storage cargo tank structure according to an embodiment of the present application. [Figure 2] 1 is a cross-sectional schematic diagram of a cryogenic storage liquid tank structure according to an embodiment of the present application. [Figure 3] FIG. 3 is a partially enlarged schematic view of region B in FIG. 2. DETAILED DESCRIPTION OF THE INVENTION

[0020] Hereinafter, embodiments of the present invention will be described with reference to specific examples. Those skilled in the art will readily understand other advantages and effects of the present application from the contents disclosed herein. Furthermore, the present application can also be implemented or applied using other different specific embodiments. Furthermore, various supplements or modifications may be made to the details in this specification based on different perspectives and applications, without departing from the spirit of the present application.

[0021] It should be noted that in the description of the present invention, unless otherwise clearly defined and limited, the term "connect" should be interpreted broadly. For example, it may be a fixed connection, a detachable connection, or an integral connection. It may also be a mechanical connection or an electrical connection. It may also be a direct connection, an indirect connection via an intermediate medium, or internal communication between two components. Those skilled in the art can interpret the specific meaning of the above terms in the present invention according to the specific circumstances. Furthermore, terms such as "first," "second," etc. are used merely for convenience of description and should not be interpreted as expressing or implying relative importance.

[0022] According to one aspect of the present application, there is provided a cryogenic cargo tank structure including a hull 100 and a cargo tank 200 installed within the hull 100. Referring to FIG. 1 , the cargo tank 200 includes a first tank body 210, a second tank body 220, and a first isolation layer 230. The first tank body 210 and the second tank body 220 are both hollow cavity-type structures. By installing the second tank body 220 inside the first tank body 210, the housing of the second tank body 220 divides the first tank body 220 and the second tank body 220 into two independent spaces capable of storing liquid cargo (a second space portion 220a located inside the second tank body 220, and a first space portion 210a located between the second tank body 220 and the first tank body 210). The first space portion 210a and the second space portion 220a are not in communication with each other. That is, two types of cryogenic liquid cargo made of different materials can be loaded independently in the first space 210a and the second space 220a, respectively. The first isolation layer 230 is installed in the first space 210a and surrounds and covers the second tank body 220, thereby further isolating the cryogenic liquid cargos loaded in the first space 210a and the second space 220a.

[0023] As those skilled in the art will appreciate, different liquid cargoes can maintain a cryogenic liquefied state at different temperatures. When the liquid cargo evaporates and changes from liquid to gas, the pressure inside the cargo tank 200 increases. If not addressed in a timely manner, this can directly damage the structure of the cargo tank 200. To prevent the evaporation of the liquid cargo due to heat conduction between the different liquid cargoes and ensure the safe use of the cargo tank 200, the present application arranges the first isolation layer 230 to surround and cover the exterior of the housing of the second tank body 220, thereby providing thermal insulation. This minimizes heat conduction between the two different liquid cargoes stored in the first space 210a and the second space 220a. The cargo tank 200 structure adopted in the present application allows the two different liquid cargoes to be stored independently while avoiding heat conduction between the different liquid cargoes. Furthermore, if the housing of the second tank body 220 is damaged, the first isolation layer 230 can also function as a splash prevention partition to prevent different liquid cargoes stacked in the first space portion 210a and the second space portion 220a from mixing with each other.

[0024] In one embodiment, the housing of the first tank body 210 comprises a prismatic airtight structure with multiple flat surfaces and a polygonal cross section, i.e., a B-type prismatic independent cargo tank structure. The housing of the second tank body 220 comprises a cylindrical airtight structure with multiple curved surfaces and a circular cross section, i.e., a C-type cargo tank structure. The cylindrical structural design of the second tank body 220 utilizes the advantage of curved panels, which have excellent pressure-resistance performance, to further improve the pressure-resistance performance of the second tank body 220 and solve the technical problem that conventional B-type cargo tanks cannot withstand high pressure.

[0025] Preferably, the second tank body 220 includes a longitudinal bulkhead 221. The material of the longitudinal bulkhead 221 must meet liquid-tightness requirements, and the longitudinal bulkhead 221 is installed at a position that extends from the bottom to the ceiling of the second tank body 220, dividing the second space 220a into two compartment spaces. Normally, liquid cargo sways within the cargo tank 200 during transportation of the hull 100, which may increase the navigation risk of the ship under adverse conditions. In addition, installing the longitudinal bulkhead 221 within the second tank body 220 can adjust the swaying frequency of the liquid cargo within the second tank body 220, thereby reducing the swaying amplitude of the liquid cargo. The installation of the longitudinal bulkhead 221 is closely related to the type of hull 100 and the design of the cargo tank 200. In other words, if it can be proven by theoretical calculation that the frequency of the liquid cargo sloshing does not affect the safe navigation of the hull 100, the longitudinal bulkhead 221 in the second tank body 220 may not be installed.

[0026] In one embodiment, the second tank body 220 further includes a plurality of reinforcing rings 222 and a second section 223 installed at intervals along the inner wall of the housing. The second section 223, the reinforcing rings 222, and the housing of the second tank body 220 having a curved plate structure can further improve the high-pressure resistance of the second tank body 220, and further enable the second tank body 220 to have a main bulkhead structure with high-pressure resistance.

[0027] Preferably, a first profile 212 is provided within the first tank body 210, and the installation position of the first profile 212 corresponds to the second profile 223. This further ensures the structural continuity and stability of the cargo tank 200. For example, in this embodiment, a plurality of first profiles 212 and a plurality of second profiles 223 are provided, and all of them are T-shaped profiles. The top of the T-shape of the first profile 212 corresponds to the bottom of the T-shape of the second profile 223.

[0028] In one embodiment, the first tank body 210 includes a plurality of horizontal bulkheads 211, which are installed inside the second space portion 220a, extend vertically from the inner wall of the housing of the first tank body 210 to the first isolation layer 230, and divide the first space portion 210a into a plurality of compartment spaces. The horizontal bulkheads 211 adjust the swaying frequency of the liquid cargo inside the first tank body 210, thereby achieving the effect of reducing the swaying amplitude of the liquid cargo.

[0029] Preferably, the transverse bulkheads 211 are further provided with through-holes 213 spaced apart, which allow the multiple compartment spaces partitioned by the transverse bulkheads 211 to communicate with each other and ensure the normal flow of liquid cargo within the different compartment spaces of the first space 210a. Each through-hole 213 is designed to the size of a manhole, thereby contributing to a reduction in the weight of the first tank body 210. In addition, each through-hole 213 is located between any two adjacent first extrusions 212, thereby also serving as an access hole, facilitating worker access and subsequent inspection and maintenance of the cargo tank 200.

[0030] Preferably, the installation position of the transverse bulkhead 211 corresponds to the installation position of the reinforcing ring 222. This ensures continuity of load transmission inside the cargo tank 200, and improves the structural stability of the cargo tank 200.

[0031] In one embodiment, the cargo tank 200 further includes a liquid storage tank 240 and a directing passage 240a. The directing passage 240a is provided between the first isolation layer 230 and the second tank body 220 and separates the first isolation layer 230 from the second tank body 220. The liquid storage tank 240 is provided at the bottom of the first tank body 210 and communicates with the directing passage 240a through the bottom housing of the first tank body 210. In accordance with the requirements of the International Code for the Construction and Equipment of Ships Carrying Liquefied Gases in Bulk, the type B tank should take into consideration the possibility of a breach of the tank within the main bulkhead (i.e., the housing of the second tank body 220) causing leakage of liquid cargo. That is, if the housing of the second tank body 220 is damaged, the cryogenic liquid cargo leaks from the cracks in the housing of the second tank body 220 and flows into the liquid storage tank 240 through the guide passage 240a due to gravity.

[0032] Preferably, the liquid storage tank 240 includes a plurality of surrounding plates 241, a plurality of baffles 242, and a second isolation layer 243. A rectangular groove-shaped structure is formed by the plurality of surrounding plates 241 and the bottom of the first tank body 210. The second isolation layer 243 is laid at the bottom of the groove-shaped structure and is made of a heat insulating plate material of a predetermined size. Furthermore, when leaked liquid cargo flows into the liquid storage tank 240 from the guide passage 240a, the second isolation layer 243 insulates the liquid cargo in the liquid storage tank 240, thereby preventing the liquid cargo from vaporizing due to a temperature rise and increasing the internal pressure of the cargo tank 200. The plurality of baffles 242 are horizontally installed above the second isolation layer 243, arranged corresponding to the positions of the first tank body 210, and vertically connected to the surrounding plate 241.

[0033] Preferably, the first isolation layer 230 further extends to cover a portion of the outer wall of the enclosure plate 241 of the liquid storage tank 240, thereby further insulating and retaining the liquid cargo in the liquid storage tank 240. The volume of the liquid storage tank 240 can be determined by the leakage amount based on theoretical calculations or low-temperature tests. At the same time, since ships are generally designed with a bowed attitude and undergo six-directional motion during seagoing, from the standpoints of economy and practicality, the number of liquid storage tanks 240 is usually one, and it is located at the tail of the first tank body 210. However, if the predicted leakage amount is too large and exceeds the upper limit of the volume of a single liquid storage tank 240, another liquid storage tank 240 can be installed at the neck of the first tank body 210 to increase the safety threshold of the cargo tank 200.

[0034] Preferably, a plurality of sensor devices, such as a temperature sensor and a pressure sensor, may be further installed in the liquid storage tank 240. These sensor devices allow real-time monitoring of the temperature and pressure conditions in the liquid storage tank 240. If the liquid cargo in the cargo tank 200 leaks into the liquid storage tank 240 through the guide passage 240a, the pressure and temperature in the liquid storage tank 240 will inevitably change, and personnel can respond to the liquid cargo leakage promptly based on the alarm signal from the sensor devices to avoid a safety accident.

[0035] In one embodiment, a plurality of support assemblies 250, each including a support base 251 and a support pad 252, are further provided at the bottom of the cargo tank 200, and the support pad 252 is positioned on the support base 251 and abuts against the outer wall of the housing of the first tank body 210. As a result, the gravity load of the cargo tank 200 is transmitted to the support base 251, and further transmitted to the hull 100 via the support base 251. In other words, the plurality of support assemblies 250 cooperate with each other to jointly support the bottom of the cargo tank 200.

[0036] Preferably, the support assembly 250 needs to support at least the bottom flat portion and two side flat portions adjacent to the flat portion of the cargo tank 200. In other words, the support assembly 250 not only supports the cargo tank 200 but also prevents the cargo tank 200 from sliding sideways due to thermal expansion and contraction, violent rocking of the hull 100, etc.

[0037] Preferably, the number of support assemblies 250 to be installed can be flexibly set according to the load weight of the cargo tank 200, and is normally four or more. In addition, the installation positions of the support assemblies 250 are set to correspond to the positions of the reinforcing rings 222 of the cargo tank 200, thereby ensuring the continuity of the load of the cargo tank 200 supported by the support assemblies 250, and improving the safety of the cargo tank 200.

[0038] In one embodiment, the support pad 252 may include a first support pad 252a and a second support pad 252b. The first support pad 252a is provided at a position corresponding to a flat portion of the outer wall of the prismatic housing of the first tank body 210 and abuts against the flat portion. The second support pad 252b is provided at a position corresponding to a ridge portion of the outer wall of the prismatic housing of the first tank body 210 and abuts against the ridge portion. The ridge portion of the outer wall of the prismatic housing of the first tank body 210 is formed in an arc shape, and the contact surface between the second support pad 252b and the first tank body 210 (the upper surface of the second support pad 252b) is formed in an arc shape, thereby improving the degree of adhesion between the second support pad 252b and the housing of the first tank body 210. Furthermore, the underside of the second support pad 252b is also an arc-shaped surface, has a circular opening, and corresponds to the rotation angle position of the support base, thereby improving the uniformity of the load distribution in the contact area between the second support pad 252b and the support base 251.

[0039] Preferably, the support 251 is formed by joining a plurality of brackets, and the spaces between the brackets are filled with a third isolation layer 253. The third isolation layer 253 is a foam isolation layer that is filled between the upper and lower brackets of the support 251. When the hull 100 is loaded with cryogenic liquid cargo, the low temperature of the cargo tank 200 is transferred to the hull 100, preventing low-temperature brittle fracture in the transfer structure and affecting the safety of use of the hull 100.

[0040] If the installation position of the support assembly 250 and the installation position of the liquid storage tank 240 interfere with each other, the bottom of the liquid storage tank 240 will directly abut against the support base 251. In other words, the second support pad 252b close to the liquid storage tank 240 is positioned so as to abut against the bottom housing of the first tank body 210, avoiding the liquid storage tank 240. This ensures stable support of the support assembly 250 at the position of the liquid storage tank 240.

[0041] The present application also provides a ship using the cryogenic storage cargo tank structure according to any of the above embodiments.

[0042] The present application provides a cryogenic cargo tank structure and a ship including a first tank body 210, a second tank body 220, and a first isolation layer 230. The second tank body 220 is installed inside the first tank body 210, and the housing of the second tank body 220 divides the interior of the first tank body 210 into two independent spaces (a first space 210a and a second space 220a) capable of storing liquid cargo. The second space 220a is located inside the second tank body 220. The first isolation layer 230 is disposed to surround and cover the exterior of the housing of the second tank body 220, thereby preventing heat transfer between the two different types of liquid cargo stored in the first space 210a and the second space 220a, thereby meeting the need to simultaneously load different types of cryogenic liquid cargo in the same cargo tank. Furthermore, if the housing structure of the second tank body 220 is damaged, the first isolation layer 230 can also function as a splash prevention partition to prevent different liquid cargoes stacked in the first space portion 210a and the second space portion 220a from mixing with each other.

[0043] The above is merely a description of the preferred embodiments of the present invention, and those skilled in the art may make various modifications and substitutions without departing from the technical principles of the present invention, and these modifications and substitutions are also within the scope of protection of the present invention. [Explanation of symbols]

[0044] 100 Hull 200 cargo tank 210 First Tank Body 210a 1st space 211 Transverse bulkhead 212 First Extrusion 213 Through hole 220 Second Tank Body 220a Second space 221 Longitudinal bulkhead 222 Reinforcement Ring 223 Second Extrusion 230 1st isolation layer 240 Liquid storage tank 240a Direction passage 241 Siege Board 242 Baffle 243 Second isolation layer 250 Support Assembly 251 Support stand 252 Support Pad 252a First support pad 252b Second support pad 253 Third isolation layer

Claims

1. A cryogenic storage cargo tank structure including a hull and a cargo tank provided within the hull, The cargo tank includes a first tank body, a second tank body installed inside the first tank body, and a first isolation layer, a first space portion for storing liquid cargo is formed between the first tank body and the second tank body, the first isolation layer is located within the first space portion and surrounds and covers the second tank body, a second space portion for storing liquid cargo is provided within the second tank body, and the second space portion is not in communication with the first space portion.

2. 2. The low-temperature storage cargo tank structure according to claim 1, wherein the housing of the first tank body includes a prismatic airtight structure having a plurality of flat surfaces and a polygonal cross section, and the housing of the second tank body includes a cylindrical airtight structure having a plurality of curved surfaces and a circular cross section.

3. 3. The low-temperature storage cargo tank structure according to claim 2, wherein the second tank body includes a longitudinal bulkhead, the longitudinal bulkhead extending through the second tank body from the bottom to the ceiling, and dividing the second space into two compartment spaces.

4. 3. The low-temperature storage cargo tank structure according to claim 2, wherein the second tank body further includes a plurality of reinforcing rings and a second profile installed at intervals along the housing inner wall, the first profile being provided within the first tank body, and the installation position of the first profile corresponding to the second profile.

5. 3. The low-temperature storage cargo tank structure according to claim 2, wherein the first tank body includes a plurality of transverse bulkheads extending vertically from the housing inner wall of the first tank body to the first isolation layer and dividing the first space into a plurality of compartment spaces, and the compartment spaces within the first space are connected to each other via a plurality of through holes provided in the transverse bulkheads.

6. 2. The low-temperature storage cargo tank structure according to claim 1, wherein the cargo tank further comprises: a flow passage provided between the first isolation layer and the second tank body and separating the first isolation layer from the second tank body; and a liquid storage tank provided at the bottom of the first tank body, penetrating a bottom housing of the first tank body and communicating with the flow passage.

7. 7. The cryogenic cargo tank structure according to claim 6, wherein the liquid storage tank includes a plurality of surrounding plates, a plurality of baffles, and a second isolation layer, a rectangular groove-shaped structure is formed by being surrounded by the plurality of surrounding plates and the bottom of the first tank body, the second isolation layer is located at the bottom of the groove-shaped structure, and the plurality of baffles are horizontally arranged above the second isolation layer and vertically connected to the surrounding plates.

8. The cryogenic cargo tank structure according to claim 7, wherein the second isolation layer comprises a heat insulating plate material.

9. The cryogenic cargo tank structure according to claim 7, wherein the first isolation layer extends to cover a portion of the outer wall of the plurality of enclosing plates.

10. 3. The low-temperature storage cargo tank structure according to claim 2, wherein a plurality of support assemblies, each including a support base and a support pad, are further provided at the bottom of the cargo tank, and the support pads are positioned on the support base and abut against the housing outer wall of the first tank body.

11. 11. The low-temperature storage cargo tank structure according to claim 10, wherein the support pads include a first support pad provided at a position corresponding to a flat portion of the outer wall of the prismatic housing of the first tank body and abutting the flat portion, and a second support pad provided at a position corresponding to a ridge portion of the outer wall of the prismatic housing of the first tank body and abutting the ridge portion.

12. 12. The low-temperature storage cargo tank structure according to claim 11, wherein the ridge of the outer wall of the prismatic housing of the first tank body is formed in an arc shape, and the contact surface between the second support pad and the first tank body is an arc surface.

13. The cryogenic cargo tank structure according to claim 11, wherein the lower surface of the second support pad is an arcuate surface, has a circular opening, and corresponds to the rotation angle position of the support platform.

14. 11. The low-temperature storage cargo tank structure according to claim 10, wherein the support base is formed by joining a plurality of brackets, and a third isolation layer is filled between the brackets, and the third isolation layer is a foam isolation layer that is filled between the upper and lower brackets of the support base.

15. A ship using the low-temperature storage cargo tank structure according to any one of claims 1 to 14.

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