Liquid cargo storage system

Abstract

The invention provides a liquid cargo storage system, and relates to the technical field of storage tank containers. The invention provides a liquid cargo storage system. The liquid cargo storage system comprises a storage tank body, a top covering structure and a collecting pipeline. The interior of the storage tank body is used for loading to-be-stored liquid, the top covering structure is installed on the storage tank body, a cavity is formed in the top covering structure, one end of the collecting pipeline communicates with the interior of the storage tank body, and the other end of the collecting pipeline is connected to the collecting device. Wherein the collecting pipeline penetrates through the top covering structure, and part of the collecting pipeline is located in the cavity. Therefore, on one hand, the problem that the gas phase pressure in the storage tank body is too large can be solved, and the possibility of damage to a collecting pipeline is reduced. On the other hand, the weight of the top covering structure is reduced due to the arrangement of the cavity, and the possibility that the top covering structure fails due to the large weight can be reduced. In conclusion, by means of the liquid cargo storage system, the storage effect of the liquid to be stored can be improved, and the use safety of the liquid cargo storage system can be improved.

Description

Technical Field

[0001] This application relates to the technical field of storage tank containers, and particularly to a liquid cargo storage system. Background Art

[0002] At present, with the improvement of people's awareness of environmental protection, the use of clean energy has also increased significantly. Among them, natural gas, as a clean energy source, its demand and application are growing rapidly. Generally, natural gas is mainly stored and transported in liquid form, and it is an effective way to store and transport liquefied natural gas through a liquid cargo storage system.

[0003] In the related art, the setting of the liquid cargo storage system is not reasonable enough, which will affect the normal operation and safety of the liquid cargo storage system. Summary of the Invention

[0004] This application provides a liquid cargo storage system, which can improve the reliability of the normal operation of the liquid cargo storage system and the safety during the use of the liquid cargo storage system.

[0005] In a first aspect, this application provides a liquid cargo storage system, including a storage tank body, a top covering structure, and a collection pipeline. The interior of the storage tank body is used for loading the liquid to be stored. The top covering structure is installed on the storage tank body, and a cavity is formed in the top covering structure. One end of the collection pipeline is communicated with the interior of the storage tank body, and the other end of the collection pipeline is connected to a collection device. Among them, the collection pipeline penetrates through the top covering structure, and a part of the collection pipeline is located in the cavity.

[0006] In this application, the liquid cargo storage system includes a collection pipeline, which can reduce the problem of excessive gas phase pressure in the storage tank body. In addition, a cavity is also provided in the top covering structure. On the one hand, the setting of the cavity can play a protective role for the collection pipeline. On the other hand, the setting of the cavity also reduces the weight of the top covering structure and can also reduce the possibility of failure of the top covering structure due to its large weight. Therefore, the liquid cargo storage system proposed in this application is beneficial to improving the storage effect of the liquid to be stored and the safety of the use of the liquid cargo storage system.

[0007] Optionally, a pressure relief valve is connected to one end of the collection pipeline. The liquid cargo storage system further includes a negative pressure device, which is communicated with the collection pipeline and is used to provide negative pressure for the collection pipeline. The collection pipeline is used to introduce the evaporation gas of the liquid to be stored into the collection device when there is liquid to be stored in the interior of the storage tank body.

[0008] Since the liquid cargo storage system further includes a negative pressure device connected to the collection pipeline, and the negative pressure device can provide negative pressure for the collection pipeline, it is convenient for the evaporated gas of the liquid to be stored to be discharged through the collection pipeline. In this way, the release efficiency and release effect of the evaporated gas of the liquid to be stored can be improved, and the possibility that the evaporated gas of the liquid to be stored is difficult to be discharged due to the too long collection pipeline can be reduced.

[0009] Optionally, the collection device includes a condenser, the condenser includes an intake pipe and a liquid outlet pipe, the collection pipeline is communicated with the intake pipe, and the liquid outlet pipe is communicated with the storage tank body.

[0010] In this way, the liquid to be stored formed after being liquefied by the condenser can be re-injected into the storage tank body through the liquid outlet pipe, reducing the loss of the liquid to be stored.

[0011] Optionally, the storage tank body includes a top wall, and the top covering structure includes a base plate, a suspension rod and a heat insulation material layer. One end of the suspension rod is connected to the top wall, the other end of the suspension rod is connected to the base plate, the heat insulation material layer is arranged on the side of the base plate facing the top wall, and a cavity is arranged in the base plate.

[0012] In the embodiment of the present application, arranging the cavity on the base plate can meet the protection of the collection pipeline by the base plate and the weight reduction effect of the suspended ceiling itself. At the same time, it can also reduce the influence on the heat insulation effect of the heat insulation material layer when the cavity is arranged in the heat insulation material layer, thereby reducing the possibility of heat insulation failure of the suspended ceiling.

[0013] Optionally, the liquid cargo storage system has an intersecting first direction and a second direction, and the distribution direction of the base plate and the top wall is the first direction. The base plate includes a plurality of first support plates distributed along the second direction. The first support plates respectively have a first groove and a second groove that are recessed in the reverse direction in the second direction. The first groove and the second groove on adjacent first support plates enclose to form a cavity. The plurality of first support plates bear the heat insulation material layer.

[0014] Through the above settings, the base plate formed by connecting a plurality of first support plates can form a form similar to a honeycomb structure. In this way, when the base plate supports the heat insulation material layer thereon, the force of the heat insulation material layer on the base plate can be evenly dispersed, reducing the possibility that the strength of a certain part of the base plate is weak due to the arrangement of the cavity and generating local stress concentration. That is, the arrangement of the first support plate in the present application can make the base plate have a higher strength while reducing the overall weight of the base plate.

[0015] Optionally, a second support plate is arranged on the side of the first support plate facing the top wall. In the first direction, the projection of the second support plate covers the cavity. The heat insulation material layer is arranged on the side of the second support plate facing the top wall.

[0016] Thus, when setting the thermal insulation material layer, the thermal insulation material layer can be set on the second support plate, which can improve the bearing effect of the substrate on the thermal insulation material layer and reduce the possibility that part of the thermal insulation material layer is set on the cavity, resulting in the collapse of the thermal insulation material layer at the cavity and even being damaged by the cavity wall and falling into the liquid to be stored.

[0017] Optionally, a detection device is further provided on the top covering structure. The detection device is installed on the side of the second support plate facing away from the top wall, and the detection device is located inside the cavity. And / or, the detection device is installed on the side of the second support plate facing the top wall.

[0018] With the above settings, the detection device can be installed on the top covering structure in different ways, and the detection device can detect the parameter information inside the storage tank body to monitor the operation of the liquid cargo storage system.

[0019] Optionally, a third support plate is further provided on the side of the first support plate facing away from the top wall, and the third support plate covers the cavity. When the detection device is installed on the side of the second support plate facing away from the top wall, a detection through hole is provided in the part of the third support plate opposite to the preset cavity, and the detection through hole communicates with the inside of the storage tank body. Wherein, the preset cavity is the cavity where the detection device is located.

[0020] With the above settings, the third support plate can protect the detection device and reduce the possibility of damage to the detection device. Moreover, a detection through hole is also provided at the position of the third support plate opposite to the preset cavity. Since the detection through hole communicates with the preset cavity, the detection device can detect the parameter information in the storage tank body through the detection through hole.

[0021] Optionally, the liquid cargo storage system further includes a casing. A first ventilation hole is provided on the second support plate, and a second ventilation hole is provided on the thermal insulation material layer. The first ventilation hole communicates with the second ventilation hole, and the casing passes through the first ventilation hole and the second ventilation hole. The part of the casing located in the first ventilation hole communicates with the cavity, and a heat insulation material is provided between the outer wall of the part of the casing located in the second ventilation hole and the thermal insulation material layer.

[0022] In this way, the casing can provide support for the thermal insulation material layer and reduce the possibility of damage to the structure of the thermal insulation material layer. Moreover, since a heat insulation material is also provided between the outer wall of the casing and the thermal insulation material layer, the setting of the heat insulation material can also greatly reduce the cold leakage while meeting the gas exchange, thereby reducing the evaporation speed of the liquid to be stored.

[0023] Optionally, the storage tank body further includes a side wall. The side wall and the top wall enclose an installation space, and the top covering structure is located in the installation space. The side of the top covering structure facing away from the top wall is used for loading the liquid to be stored. A support member is fixed on the side wall. There is a gap between the middle of the support member and the side wall. A hook is rotatably connected to the support member. A protective plate is connected to the side of the hook facing away from the support member. The side of the protective plate away from the support member abuts against the second support plate.

[0024] In this way, the setting of the protective plate in this application can seal the space between the top covering structure and the side wall, improving the protection effect of the top covering structure. In addition, the setting of the protective plate can also better adapt to the deformation of the top covering structure, and can further improve the preservation effect of the liquid to be stored inside the storage tank. Description of the Drawings

[0025] Figure 1 It is a schematic diagram of a liquid cargo storage system according to an embodiment of the present application.

[0026] Figure 2 It is a schematic connection diagram of a top wall and a top covering structure according to an embodiment of the present application.

[0027] Figure 3 It is a schematic connection diagram of a top covering structure and a collection device according to an embodiment of the present application.

[0028] Figure 4 It is a schematic structural diagram of a top covering structure according to an embodiment of the present application.

[0029] Figure 5 It is a schematic diagram of the setting of the first support plate in a top covering structure according to an embodiment of the present application.

[0030] Figure 6 It is a partial view of a top covering structure according to an embodiment of the present application.

[0031] Figure 7 It is a schematic connection diagram of a side wall and a top covering structure according to an embodiment of the present application.

[0032] Figure 8 It is a structural diagram of the connection between a side wall and a top covering structure according to an embodiment of the present application.

[0033] Figure 9 It is a schematic installation diagram of a support member and a hook according to an embodiment of the present application.

[0034] Description of the Reference Numerals: 100: Liquid cargo storage system; 10: Storage tank body; 11: Top wall; 12: Side wall; 20: Top covering structure; 201: Cavity; 21: Substrate; 22: Suspender; 23: Thermal insulation material layer; 24: Detection device; 211: First support plate; 2111: First groove; 2112: Second groove; 212: Second support plate; 2121: First ventilation hole; 213: Third support plate; 202: Preset cavity; 2131: Detection through hole; 231: Second ventilation hole; 25: Sleeve; 26: Thermal insulation material; 30: Collection pipeline; 31: Pressure relief valve; 40: Collection device; 50: Support member; 60: Hook; 70: Protection plate; X: First direction; Y: Second direction. Detailed implementation manners

[0035] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Apparently, the described embodiments are some but not all of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the scope of protection of the present application.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the drawings are intended to cover non-exclusive inclusion.

[0037] Reference to "embodiment" herein means that a particular feature, structure or characteristic described in connection with the embodiment can be included in at least one embodiment of this application. The phrase "embodiment" appearing in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0038] The term "and / or" herein is only a description of the associated relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can represent three situations: there is A, there is both A and B, and there is B. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after.

[0039] The directional terms used in the following description are all the directions shown in the figures, and do not limit the specific structure of the present application. For example, in the description of the present application, terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation of the present application.

[0040] In addition, the terms "first", "second", etc. in the description and claims of the present application or in the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order, and may explicitly or implicitly include one or more of such features.

[0041] In the description of the present application, unless otherwise specified, the meaning of "a plurality" refers to two or more (including two). Similarly, "a plurality of groups" refers to two or more groups (including two groups).

[0042] In the description of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "coupled" should be understood in a broad sense. For example, the "connection" or "coupling" of a mechanical structure may refer to a physical connection. For example, a physical connection may be a fixed connection, such as a fixed connection through a spacer, such as a fixed connection through screws, bolts, or other spacers; a physical connection may also be a detachable connection, such as a snap connection or a snap-fit connection; a physical connection may also be an integral connection, such as a connection by welding, bonding, or integrally forming a connection. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0043] It should be understood that the "one embodiment" or "an embodiment" mentioned throughout the specification means that a specific feature, structure, or characteristic related to the embodiment is included in at least one embodiment of the present application. Therefore, the "in one embodiment" or "in an embodiment" that appears throughout the specification does not necessarily refer to the same embodiment. In addition, these specific features, structures, or characteristics can be combined in one or more embodiments in any suitable manner.

[0044] A liquid cargo storage system is an integrated system for storing liquid cargoes and is widely used in fields such as energy and chemical industry. With the increasing demand for clean energy, natural gas, as a type of clean energy, its application is also growing rapidly. The storage and transportation of natural gas rely more on liquid cargo storage systems.

[0045] To improve the storage and transportation efficiency of natural gas, natural gas is usually loaded in the liquid cargo storage system in the form of liquefied natural gas (LNG). However, even in a well-insulated storage tank, external heat energy will still slowly penetrate through the tank wall and inevitably evaporate into boil-off gas (BOG). As the LNG continues to evaporate, the pressure in the gas phase space inside the storage tank gradually increases, and excessive pressure will damage the structure of the liquid cargo storage system and cause danger.

[0046] Based on the above problems, an embodiment of the present application proposes a liquid cargo storage system 100. The liquid cargo storage system 100 provided by the embodiment of the present application will be introduced in detail below with reference to the accompanying drawings.

[0047] Refer to Figure 1 、 Figure 2 and Figure 3 As shown, the liquid cargo storage system 100 provided by the present application includes a storage tank body 10, a top covering structure 20, and a collection pipeline 30. The inside of the storage tank body 10 is used to load the liquid to be stored. The top covering structure 20 is installed on the storage tank body 10, and a cavity 201 is formed in the top covering structure 20. One end of the collection pipeline 30 is communicated with the inside of the storage tank body 10, and the other end of the collection pipeline 30 is connected to a collection device 40. Among them, the collection pipeline 30 penetrates through the top covering structure 20, and a part of the collection pipeline 30 is located in the cavity 201.

[0048] In the embodiment of the present application, the liquid cargo storage system 100 includes a storage tank body 10, a top covering structure 20, and a collection pipeline 30. Among them, the inside of the storage tank body 10 can be used to load the liquid to be stored. The storage tank body 10 has a heat preservation effect on the liquid to be stored, so that the liquid to be stored can remain in a liquid form inside the storage tank body 10, which can improve the stability of the liquid to be stored inside the storage tank body 10.

[0049] Among them, the top covering structure 20 is installed on the storage tank body 10. The top covering structure 20 can cooperate with the storage tank body 10 to seal the space where the liquid to be stored is located and maintain the temperature of the space where the liquid to be stored is located. That is, the top covering structure 20 and the storage tank body 10 cooperate to reduce the convection of cold and hot air inside the storage tank body 10, which is beneficial to the storage of the liquid to be stored.

[0050] The liquid cargo storage system 100 proposed in this application further includes a collection pipeline 30. One end of the collection pipeline 30 is communicated with the interior of the storage tank body 10, and a collection device 40 is connected to the other end of the collection pipeline 30. Since the collection pipeline 30 penetrates the top covering structure 20, the collection pipeline 30 can extend into the space where the liquid to be stored is located through the top covering structure 20. In this way, when BOG appears inside the storage tank body 10, the BOG can enter the collection pipeline 30 and enter the collection device 40 through the collection pipeline 30.

[0051] That is, the collection pipeline 30 in this application can export the BOG generated inside the storage tank body 10, reducing the possibility that due to the continuous evaporation of LNG, the pressure in the gas phase space inside the storage tank body 10 becomes too high, thereby damaging the liquid cargo storage system 100 and causing danger.

[0052] In addition, in this application, a cavity 201 is also formed in the top covering structure 20. When setting the collection pipeline 30, part of the collection pipeline 30 is located in the cavity 201. In this way, the cavity wall of the cavity 201 can protect the part of the collection pipeline 30 located in the cavity 201, reducing the possibility that when the BOG flows inside the storage tank body 10, it directly impacts the collection pipeline 30 and easily causes damage to the collection pipeline 30. Specifically, when the BOG flows inside the storage tank body 10, the cavity wall of the cavity 201 can bear part of the impact, reducing the impact directly acting on the collection pipeline 30, and can avoid the possibility of damage to the collection pipeline 30.

[0053] Furthermore, the setting of the cavity 201 can also reduce the weight of the top covering structure 20. In this way, it is possible to avoid the problem that due to the excessive weight of the top covering structure 20, the storage tank body 10 cannot bear the top covering structure 20, and then the connection between the top covering structure 20 and the storage tank body 10 is disconnected. In this way, it is possible to greatly reduce the possibility that the top covering structure 20 fails by itself and affects the storage of the liquid to be stored.

[0054] In summary, in this application, the liquid cargo storage system 100 includes a collection pipeline 30, which can export the BOG in the storage tank body 10 and reduce the problem of excessive gas phase pressure in the storage tank body 10. In addition, a cavity 201 is also provided in the top covering structure 20. On the one hand, the setting of the cavity 201 can protect the collection pipeline 30 and reduce the possibility that the collection pipeline 30 is damaged due to the fluctuation or flow of the BOG. On the other hand, the setting of the cavity 201 also reduces the weight of the top covering structure 20, and can also reduce the possibility that the top covering structure 20 fails due to its large weight.

[0055] Therefore, the liquid cargo storage system 100 proposed in this application is beneficial to improving the storage effect of LNG and the safety of the use of the liquid cargo storage system 100.

[0056] It should be noted that in the liquid cargo storage system 100, the storage tank body 10 may specifically include an inner tank and an outer tank. Among them, the inner tank directly bears LNG, the inner tank is connected inside the outer tank, and the outer tank can support and protect the inner tank. The top covering structure 20 and the inner tank can enclose to form a receiving cavity for loading the liquid to be stored. One end of the collection pipeline 30 may specifically communicate with the receiving cavity.

[0057] In the embodiment of the present application, a part of the collection pipeline 30 located on the side of the top covering structure 20 facing the receiving cavity may be located in the cavity 201. In this way, each part of the collection pipeline 30 located in the receiving cavity can be protected by the top covering structure 20, as Figure 3 shown. In this way, it is possible to reduce the possibility that a part of the collection pipeline 30 extends out of the top covering structure 20, resulting in the end of the collection pipeline 30 being easily affected by the BOG fluctuation or flow.

[0058] Of course, only a part of the collection pipeline 30 located on the side of the top covering structure 20 facing the receiving cavity may also be located in the cavity 201. That is, a part of the collection pipeline 30 may also extend out of the top covering structure 20. In this way, the part of the collection pipeline 30 located in the cavity 201 can be protected by the top covering structure 20, and the possibility of damage to the collection pipeline 30 can also be reduced.

[0059] It should also be noted that in the above description, LNG is taken as an example of the liquid to be stored for illustration. However, it can be understood that the liquid cargo storage system 100 proposed in the present application can also be used for storing other liquids, such as liquid hydrogen, liquefied petroleum gas, etc. The specific type of the liquid to be stored is not specifically limited in the embodiment of the present application.

[0060] In some embodiments, as Figure 1 and Figure 3 shown, a pressure relief valve 31 is connected to one end of the collection pipeline 30. The liquid cargo storage system 100 may further include a negative pressure device, which is communicated with the collection pipeline 30 and is used to provide negative pressure for the collection pipeline 30. The collection pipeline 30 is used to introduce the evaporation gas of the liquid to be stored into the collection device 40 when there is a liquid to be stored inside the storage tank body 10.

[0061] In the embodiment of the present application, BOG can enter the collection pipeline 30 through the pressure relief valve 31 to be discharged from the storage tank body 10. Specifically, the pressure relief valve 31 can monitor the pressure inside the storage tank body 10 to a certain extent. When a small amount of BOG is generated inside the storage tank body 10, the pressure change inside the storage tank body 10 is not much, and at this time, the pressure relief valve 31 remains closed.

[0062] As the BOG accumulates continuously, the pressure of the storage tank body 10 will also gradually increase. When the pressure is higher than the pressure threshold set by the pressure relief valve 31, the pressure relief valve 31 can be pushed open. At this time, the BOG can enter the collection pipeline 30 from the pressure relief valve 31 and be discharged from the inside of the storage tank body 10. As the BOG is released, the pressure inside the storage tank body 10 will gradually decrease. When the pressure is lower than the pressure threshold, the pressure relief valve 31 closes again. That is, the pressure relief valve 31 can cooperate with the collection pipeline 30 to realize the discharge of the BOG from the inside of the storage tank body 10.

[0063] Since the liquid cargo storage system 100 further includes a negative pressure device connected to the collection pipeline 30, and the negative pressure device can provide negative pressure for the collection pipeline 30, it is convenient for the BOG to be discharged through the collection pipeline 30. In this way, the release efficiency and release effect of the BOG can be improved, and the possibility that the BOG is difficult to discharge due to the situation such as the too long collection pipeline 30 can be reduced.

[0064] It should be noted that in the embodiments of the present application, the negative pressure device can specifically be a vacuum pump, a negative pressure machine, etc. For the specific type of the negative pressure device, the embodiments of the present application do not make specific limitations here, as long as it can generate negative pressure and is conducive to the BOG entering the collection device 40 through the collection pipeline 30.

[0065] In some embodiments, the collection device 40 can include a condenser. The condenser includes an intake pipe and a liquid outlet pipe. The collection pipeline 30 is communicated with the intake pipe. The liquid outlet pipe is communicated with the storage tank body 10.

[0066] In the embodiments of the present application, the collection device 40 can specifically be a condenser. Among them, the collection pipeline 30 is communicated with the intake pipe of the condenser. In this way, after the BOG enters the condenser, the BOG can be liquefied again under the action of the condenser to form LNG. And the liquid outlet pipe of the condenser is connected to the storage tank body 10. In this way, the LNG formed after being liquefied by the condenser can be re-injected into the storage tank body 10 through the liquid outlet pipe, reducing the loss of LNG.

[0067] Of course, in addition to the condenser, the collection device 40 can also be other structures. For example, the collection device 40 can be a fuel tank, that is, the BOG can enter the fuel tank through the collection pipeline 30. In this way, the BOG can be used as fuel, and the self-power supply of the liquid cargo storage system 100 can be realized.

[0068] It should be noted that the liquid cargo storage system 100 can be divided into a land system and an ocean system according to the use scenario. Among them, the land system is mainly used for the storage of liquefied natural gas on land, and the ocean system is mainly used for the storage and transportation of liquefied natural gas in the marine environment. The storage tank body 10 in the ocean system is arranged in the hull.

[0069] The liquid cargo storage system 100 in this application can be applied in different scenarios. For land systems and marine systems, the specific structures of the top covering structure 20 are different. Whether it is a land system or a marine system, the aforementioned cavity 201 can be provided in the top covering structure 20.

[0070] For a marine system, the top covering structure 20 includes a dome. Among them, the storage tank body 10 has opposite top and bottom. An opening for injecting or discharging LNG is provided at the top of the storage tank body 10. The dome is installed on the top of the storage tank body 10 and seals the opening at the top of the storage tank body 10. The cavity 201 can be specifically provided on the side of the dome facing the bottom of the storage tank body 10, and the cavity 201 does not penetrate the dome. And, in order to reduce the influence of the setting of the cavity 201 on the strength of the dome, reinforcing ribs can also be provided in the cavity 201.

[0071] For a land system, the storage tank body 10 can include a top wall 11. The top wall 11 can serve as the main load-bearing structure of the storage tank body 10, bearing the load on the top of the storage tank body 10 and protecting the safety of the inner tank. And the top covering structure 20 serves as a heat insulation structure, reducing the transfer of external heat into the storage tank body 10 and reducing the diffusion of cold air inside the storage tank body 10 to the outside.

[0072] And the top covering structure 20 includes a base plate 21, a suspension rod 22, and a heat insulation material layer 23, as Figure 1 、 Figure 2 and Figure 4 shown. The base plate 21 and the heat insulation material layer 23 can form a suspended ceiling of the liquid cargo storage system 100 and are installed on the storage tank body 10 through the suspension rod 22. Specifically, one end of the suspension rod 22 is connected to the top wall 11, the other end of the suspension rod 22 is connected to the base plate 21, the heat insulation material layer 23 is provided on the side of the base plate 21 facing the top wall 11, and the cavity 201 is provided in the base plate 21. At this time, a space for loading LNG can be formed between the side of the base plate 21 facing away from the top wall 11 and the storage tank body 10.

[0073] Through the above settings, the base plate 21 can be connected to the top wall 11 through the suspension rod 22. The suspension rod 22 can provide support and connection between the base plate 21 and the top wall 11 so that the base plate 21 can be installed on the storage tank body 10. And above the base plate 21, a heat insulation material layer 23 is also provided. The setting of the heat insulation material layer 23 can keep the cold of the LNG from the direction of the top wall 11 and reduce the transfer of heat from the side of the base plate 21 facing the top wall 11 to the side of the base plate 21 facing away from the top wall 11.

[0074] In the embodiment of the present application, the cavity 201 is arranged on the substrate 21, which can meet the protection of the substrate 21 for the collection pipeline 30 and the weight reduction effect of the ceiling itself. At the same time, it can also reduce the influence on the heat insulation effect of the heat insulation material layer 23 when the cavity 201 is arranged in the heat insulation material layer 23, thereby reducing the possibility of ceiling heat insulation failure.

[0075] It should be noted that, as Figure 1 and Figure 2 shown, there can be multiple suspender rods 22 in the top covering structure 20, and the multiple suspender rods 22 are arranged at intervals between the substrate 21 and the top wall 11. In this way, the multiple suspender rods 22 can connect and support the substrate 21 and the heat insulation material layer 23, which can improve the reliability of the arrangement of the substrate 21 and the heat insulation material layer 23 and reduce the force on a single suspender rod 22. In the present application, the reduction of the weight of the substrate 21 is also beneficial to reducing the force on the suspender rod 22 and reducing the possibility that the force on the suspender rod 22 is too large and easy to be damaged.

[0076] It should also be noted that the heat insulation material layer 23 can be made of different materials, such as glass wool felt or polyurethane foam, etc. The specific material of the heat insulation material layer 23 is not specifically limited in the embodiment of the present application.

[0077] Here, the present application will describe the specific structure of the substrate 21. As Figure 1 、 Figure 2 、 Figure 4 and Figure 5 shown, the liquid cargo storage system 100 can have an intersecting first direction X and a second direction Y, and the distribution direction of the substrate 21 and the top wall 11 is the first direction X. The substrate 21 includes a plurality of first support plates 211 distributed along the second direction Y. The first support plates 211 respectively have a first groove 2111 and a second groove 2112 that are recessed in the reverse direction in the second direction Y. The first groove 2111 and the second groove 2112 on adjacent first support plates 211 enclose to form a cavity 201. The plurality of first support plates 211 carry the heat insulation material layer 23.

[0078] The substrate 21 and the top wall 11 are distributed along the first direction X. In this way, the suspender rod 22 can extend along the first direction X to connect the substrate 21 and the top wall 11. For the substrate 21, the substrate 21 can include a plurality of first support plates 211, and the plurality of first support plates 211 are distributed along the second direction Y. Since the first direction X intersects the second direction Y, the surface formed by the plurality of first support plates 211 will be different from the distribution direction of the substrate 21 and the top wall 11. In this way, the plurality of first support plates 211 can form a surface in the storage tank body 10 that can be used to carry the heat insulation material layer 23, so that the heat insulation material layer 23 can keep the LNG cold and insulated.

[0079] The first support plates 211 respectively have a first groove 2111 and a second groove 2112 which are concave in the second direction Y. In the substrate 21, the first groove 2111 is provided on one of the two adjacent first support plates 211, and can be opposite to the second groove 2112 provided on the other first support plate 211. In this way, in any two adjacent first support plates 211, the groove bottom of the first groove 2111 can be opposite to the groove bottom of the second groove 2112, and when multiple first support plates 211 are connected to each other, the first groove 2111 and the second groove 2112 can enclose to form a cavity 201.

[0080] Under this setting mode of the present application, the substrate 21 formed by connecting multiple first support plates 211 can form a form similar to a honeycomb structure. In this way, when the substrate 21 supports the insulating material layer 23 thereon, the force of the insulating material layer 23 on the substrate 21 can be evenly dispersed, reducing the possibility that the strength of a certain part of the substrate 21 is weak due to the setting of the cavity 201, resulting in local stress concentration. That is, the setting of the first support plate 211 in the present application can reduce the overall weight of the substrate 21 while making the strength of the substrate 21 higher.

[0081] It should be noted that the first direction X intersects with the second direction Y, and there may be an angle between the first direction X and the second direction Y. The angle may be 90°, 80°, 79°, 96° or 101°, etc. The specific value of the angle between the first direction X and the second direction Y is not specifically limited in the embodiment of the present application.

[0082] In some embodiments, Figure 1 , Figure 2 and Figure 4 As shown, a second support plate 212 is disposed on one side of the first support plate 211 facing the top wall 11 , and a projection of the second support plate 212 covers the cavity 201 in the first direction X. A heat insulating material layer 23 is disposed on one side of the second support plate 212 facing the top wall 11 .

[0083] Through the above arrangement, the second support plate 212 can construct a plane on the side of the plurality of first support plates 211 facing the top wall 11. In this way, when the heat insulating material layer 23 is arranged, the heat insulating material layer 23 can be arranged on the second support plate 212, which can improve the bearing effect of the substrate 21 on the heat insulating material layer 23, and reduce the possibility that part of the heat insulating material layer 23 is arranged on the cavity 201, causing the heat insulating material layer 23 to collapse easily at the position of the cavity 201, or even be damaged by the action of the cavity wall of the cavity 201, and fall into the LNG.

[0084] In some embodiments, Figure 1 , Figure 4 and Figure 6As shown, a detection device 24 may also be provided on the top covering structure 20. The detection device 24 is installed on the side of the second support plate 212 facing away from the top wall 11, and the detection device 24 is located inside the cavity 201. And / or, the detection device 24 is installed on the side of the second support plate 212 facing the top wall 11.

[0085] A detection device 24 is also provided on the top covering structure 20. The detection device 24 can detect the parameter information inside the storage tank body 10 to monitor the operation of the liquid cargo storage system 100.

[0086] In the embodiment of the present application, the detection device 24 may specifically have different installation methods. For example, the detection device 24 can be installed in the cavity 201, and reference can be made to Figure 4 and Figure 6 . In this way, on the one hand, the cavity 201 can provide an installation position for the detection device 24, facilitating the installation of the detection device 24. On the other hand, the first support plate 211 can also play a certain protective role for the detection device 24, reducing the possibility that the impact inside the storage tank body 10 directly acts on the detection device 24, resulting in easy damage to the detection device 24.

[0087] Alternatively, the detection device 24 can also be installed on the side of the second support plate 212 facing the top wall 11. At this time, the detection device 24 can be specifically installed on the suspension rod 22, on the heat insulation material layer 23, or on the top wall 11, etc.

[0088] Or, the detection device 24 can also be provided on both sides of the second support plate 212. That is, the detection device 24 can be provided on the side of the second support plate 212 facing the top wall 11, and at the same time, the detection device 24 can also be provided on the side of the second support plate 212 facing away from the top wall 11.

[0089] For the specific installation method of the detection device 24, it can be specifically designed according to the size of the storage tank body 10, the application scenario, etc.

[0090] It should be noted that for the liquid cargo storage system 100, in order to maintain its normal operation, the detection of the temperature, pressure, gas composition, etc. inside the storage tank body 10 is also crucial. The aforementioned detection device 24 can specifically be any one of a temperature sensor, a pressure sensor, and a gas composition sensor.

[0091] The second support plate 212 is connected to the side of the first support plate 211 facing the top wall 11, and can support the heat-insulating material layer 23. In addition, on the side of the first support plate 211 facing away from the top wall 11, a third support plate 213 can also be connected. The third support plate 213 can cover at least part of the cavity 201. When the detection device 24 is installed on the side of the second support plate 212 facing away from the top wall 11, a detection through-hole 2131 is provided in the part of the third support plate 213 opposite to the preset cavity 202, and the detection through-hole 2131 communicates with the inside of the storage tank body 10. As Figure 1 , Figure 4 and Figure 6 shown.

[0092] Since the third support plate 213 covers at least part of the cavity 201, the third support plate 213 can block the cavity 201 opposite to it to protect the components in the cavity 201. Specifically, the detection device 24 can be installed in the cavity 201 opposite to the third support plate 213. In this way, the third support plate 213 can protect the detection device 24 and reduce the possibility of damage to the detection device 24.

[0093] Among them, the cavity 201 where the detection device 24 is located is the preset cavity 202. In order to reduce the influence of the setting of the third support plate 213 on the operation of the detection device 24, a detection through-hole 2131 is also provided at the position of the third support plate 213 opposite to the preset cavity 202. Since the detection through-hole 2131 communicates with the preset cavity 202, the detection device 24 can detect the temperature, pressure or gas composition in the storage tank body 10 through the detection through-hole 2131.

[0094] In the embodiment of the present application, the third support plate 213 can be only provided at the position opposite to the preset cavity 202. Or, the third support plate 213 can also be opposite to multiple first support plates 211. At this time, the third support plate 213 can block multiple cavities 201.

[0095] In some embodiments, as Figure 3 shown, the liquid cargo storage system 100 further includes a sleeve 25. A first ventilation hole 2121 can be provided on the second support plate 212, and a second ventilation hole 231 is provided on the heat-insulating material layer 23. The first ventilation hole 2121 communicates with the second ventilation hole 231, and the sleeve 25 passes through the first ventilation hole 2121 and the second ventilation hole 231. The part of the sleeve 25 located in the first ventilation hole 2121 communicates with the cavity 201, and a heat-insulating material 26 is provided between the outer wall of the part of the sleeve 25 located in the second ventilation hole 231 and the heat-insulating material layer 23.

[0096] In this way, gas exchange can be carried out on both sides of the ceiling through the sleeve 25 to balance the pressure in the gas phase spaces above and below the ceiling, ensuring the safe operation of the liquid cargo storage system 100.

[0097] In the embodiment of the present application, the sleeve 25 can specifically pass through the first ventilation hole 2121 and the second ventilation hole 231 to penetrate the substrate 21 and the heat insulation material layer 23. In this way, a part of the sleeve 25 is located in the substrate 21, and a part is located in the heat insulation material layer 23.

[0098] Among them, the part of the sleeve 25 located in the substrate 21 can be located in the cavity 201. In this way, the first support plate 211 can protect this part of the sleeve 25. For the part of the sleeve 25 located in the heat insulation material layer 23, on the one hand, the sleeve 25 can provide support for the heat insulation material layer 23, reducing the possibility of structural damage to the heat insulation material layer 23. On the other hand, a heat insulation material 26 is also provided between the outer wall of the sleeve 25 and the heat insulation material layer 23. The setting of the heat insulation material 26 can also greatly reduce cold leakage while satisfying gas exchange, thereby reducing the evaporation rate of LNG.

[0099] In the above description of the present application, it is described that the first support plate 211 with a honeycomb-like structure is provided in the substrate 21 to form the cavity 201. In addition to the above method, the substrate 21 can also have other settings to form the cavity 201. For example, the substrate 21 can be stamped so that grooves recessed along the first direction X are formed on the substrate 21. When installing the substrate 21, the notch of the groove on the substrate 21 can be installed facing the top wall 11. In this way, the part of the substrate 21 between two adjacent grooves is relatively close to the top wall 11, and a cavity 201 can be formed between the parts of the substrate 21 between two adjacent grooves.

[0100] In some embodiments, such as Figure 1 and Figure 7 shown, the storage tank body 10 further includes a side wall 12, and the side wall 12 and the top wall 11 can enclose an installation space. In this way, the top covering structure 20 can be arranged in the installation space and cooperate with the side wall 12. In this way, the side wall 12 can seal the periphery of the top covering structure 20, reducing the possibility of cold leakage at the periphery of the top covering structure 20.

[0101] Specifically, the top covering structure 20 is arranged in the installation space, and the top covering structure 20 can divide the space inside the storage tank body 10 into two parts. That is, the space between the top covering structure 20 and the top wall 11, and the space on the side of the top covering structure 20 facing away from the top wall 11. When the liquid to be stored is loaded inside the storage tank body 10, the liquid to be stored can specifically be located on the side of the covering structure of the top wall 11 facing away from the top wall 11. Thus, the top covering structure 20 can preferably reduce the possibility of external heat entering the storage tank body 10, and further reduce the possibility of the liquid to be stored vaporizing due to heat absorption.

[0102] Herein, the present application will describe the specific cooperation between the top covering structure 20 and the side wall 12 as follows.

[0103] As Figure 7 、 Figure 8 and Figure 9 shown, a support member 50 can be fixed on the side wall 12. There is a gap between the middle part of the support member 50 and the side wall 12, and a hook 60 is rotatably connected to the support member 50. A protective plate 70 is connected to the side of the hook 60 facing away from the support member 50, and the side of the protective plate 70 away from the support member 50 abuts against the second support plate 212.

[0104] In the present application, the hook 60 can rotate relative to the support member 50. Since there is a gap between the middle part of the support member 50 and the side wall 12, therefore, the gap can provide a certain avoidance space for the rotation of the hook 60. When the hook 60 rotates, the part of the hook 60 connected to the support member 50 can move in the aforementioned gap so that the hook 60 can rotate normally.

[0105] Thus, the side of the protective plate 70 close to the side wall 12 is connected to the hook 60, and the hook 60 can play a role in installing and supporting the protective plate 70. The side of the protective plate 70 away from the support member 50 can abut against the second support plate 212. Thus, the protective plate 70 can block the space between the top covering structure 20 and the side wall 12, and reduce the possibility of heat flowing through the space between the top covering structure 20 and the side wall 12.

[0106] In the embodiment of the present application, the side of the protective plate 70 away from the support member 50 is installed in an abutting manner with the second support plate 212. Thus, the side of the protective plate 70 away from the support member 50 can slide on the second support plate 212. In this way, the setting of the protective plate 70 can adapt to the low-temperature environment inside the storage tank body 10.

[0107] Specifically, the second support plate 212 will shrink in a low-temperature environment, resulting in an increase in the distance between the second support plate 212 and the side wall 12. In the present application, the abutting arrangement between the protection plate 70 and the second support plate 212 enables the protection plate 70 to slide relative to the second support plate 212 when the second support plate 212 shrinks, causing the abutting position between the protection plate 70 and the second support plate 212 to change.

[0108] Correspondingly, when the liquid to be stored is discharged from the storage tank body 10, the temperature inside the storage tank body 10 may increase again. At this time, the second support plate 212 may expand, resulting in a decrease in the distance between the second support plate 212 and the side wall 12. When the second support plate 212 expands, the protection plate 70 can also slide relative to the second support plate 212.

[0109] Therefore, the arrangement of the protection plate 70 in the present application can better adapt to the deformation of the top covering structure 20 and improve the preservation effect of the liquid to be stored inside the storage tank.

[0110] It should be noted that the protection plate 70 can specifically be a plywood board, a metal plate, etc. To facilitate the sliding of the protection plate 70 relative to the second support plate 212, the firmness of the connection between the protection plate 70 and the hook 60 can be relatively low. For example, the hook 60 and the protection plate 70 can be connected by a threaded member. When screwing the threaded member between the hook 60 and the protection plate 70 for connection, the threaded member can be not tightened, but there can be a certain gap between the head of the threaded member and the protection plate 70.

[0111] It also should be noted that to ensure the overall cold insulation effect of the top covering structure 20, it is necessary to seal all parts of the perimeter of the top covering structure 20 to reduce the possibility that there is a large space between a certain part of the top covering structure 20 and the side wall 12, resulting in easy heat circulation at this part and further leading to the possible gasification of the liquid to be stored inside the storage tank body 10.

[0112] Specifically, a plurality of support members 50 can be provided on the side wall 12 of the storage tank body 10. The plurality of support members 50 can be distributed along the perimeter of the top covering structure 20, and the protection plates 70 connected to adjacent two support members 50 abut against each other. In this way, the entire perimeter of the top covering structure 20 can be sealed by the protection plates 70, which can improve the heat preservation effect of the storage tank body 10.

[0113] In addition, when the top covering structure 20 includes a plurality of first support plates 211 but does not include the second support plate 212, the side of the protection plate 70 away from the support member 50 can abut against the first support plate 211. In this way, the sealing of the perimeter of the top covering structure 20 can also be achieved.

[0114] In the embodiment of the present application, the liquid cargo storage system 100 includes a collection pipeline 30, which can export the BOG in the storage tank body 10 to reduce the problem of excessive gas phase pressure in the storage tank body 10. In addition, a cavity 201 is provided in the top covering structure 20. On the one hand, the setting of the cavity 201 can protect the collection pipeline 30 and reduce the possibility of damage to the collection pipeline 30 caused by the fluctuation or flow of the BOG. On the other hand, the setting of the cavity 201 also reduces the weight of the top covering structure 20 and can also reduce the possibility of failure of the top covering structure 20 due to its large weight.

[0115] Finally, it should be noted that the above embodiments are only specific embodiments of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present application should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A liquid cargo storage system, characterized in that, include: The tank body is used to load the liquid to be stored; A top covering structure is mounted on the tank body, wherein a cavity is formed in the top covering structure; A collecting pipeline, one end of which is in communication with the interior of the storage tank body, and the other end of which is connected to a collecting device; Wherein, the collecting pipeline runs through the top covering structure, and part of the collecting pipeline is located in the cavity.

2. The liquid cargo storage system according to claim 1, characterized in that, One end of the collecting pipeline is connected to a pressure relief valve, and the liquid cargo storage system further comprises a negative pressure device, which is in communication with the collecting pipeline and is used to provide negative pressure for the collecting pipeline; The collecting pipeline is used to introduce the evaporated gas of the liquid to be stored into the collecting device when the liquid to be stored is loaded inside the storage tank body.

3. The liquid cargo storage system according to claim 1, characterized in that, The collecting device comprises a condenser, the condenser comprises an air inlet pipe and a liquid outlet pipe, and the collecting pipeline is connected to the air inlet pipe; The liquid outlet pipe is communicated with the storage tank body.

4. The liquid cargo storage system according to claim 1, characterized in that, The storage tank body comprises a top wall, and the top covering structure comprises a base plate, a suspension rod and a thermal insulation material layer; One end of the suspension rod is connected to the top wall, and the other end of the suspension rod is connected to the base plate. The heat insulating material layer is arranged on a side of the base plate facing the top wall, and the cavity is arranged in the base plate.

5. The liquid cargo storage system according to claim 4, characterized in that, The liquid cargo storage system has a first direction and a second direction intersecting each other, and the distribution direction of the base plate and the top wall is the first direction; The substrate comprises a plurality of first support plates distributed along the second direction, wherein the first support plates respectively have a first groove and a second groove which are reversely recessed in the second direction, and the first grooves and the second grooves on adjacent first support plates are combined to form the cavity; The plurality of first support plates bear the thermal insulation material layer.

6. The liquid cargo storage system according to claim 5, characterized in that, A second support plate is disposed on one side of the first support plate facing the top wall, and in the first direction, a projection of the second support plate covers the cavity; The heat insulating material layer is arranged on a side of the second supporting plate facing the top wall.

7. The liquid cargo storage system according to claim 6, characterized in that, The top covering structure is also provided with a detection device; The detection device is installed on a side of the second support plate away from the top wall, and the detection device is located inside the cavity; And / or, the detection device is installed on a side of the second support plate facing the top wall.

8. The liquid cargo storage system according to claim 7, characterized in that, A third support plate is further provided on a side of the first support plate facing away from the top wall, and the third support plate covers at least a portion of the cavity; In the case where the detection device is installed on the side of the second support plate away from the top wall, a portion of the third support plate opposite to the preset cavity is provided with a detection through hole, and the detection through hole is communicated with the interior of the storage tank body; Wherein, the preset cavity is the cavity where the detection device is located.

9. The liquid cargo storage system according to claim 6, characterized in that, The liquid cargo storage system comprises a sleeve, a first vent hole is provided on the second support plate, a second vent hole is provided on the thermal insulation material layer, the first vent hole is communicated with the second vent hole, and the sleeve is passed through the first vent hole and the second vent hole; A part of the sleeve located in the first ventilation hole communicates with the cavity, and a heat-insulating material is provided between the outer wall of the part of the sleeve located in the second ventilation hole and the heat-insulating material layer.

10. The liquid cargo storage system according to claim 6, characterized in that, The storage tank body further includes a side wall, the side wall and the top wall enclose an installation space, the top covering structure is located in the installation space, and the side of the top covering structure facing away from the top wall is used for loading the liquid to be stored; A support member is fixed on the side wall, there is a gap between the middle of the support member and the side wall, a hook is rotatably connected to the support member, a protective plate is connected to the side of the hook facing away from the support member, and the side of the protective plate away from the support member abuts against the second support plate.

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