A marine LNG gas supply apparatus

Abstract

The application discloses a marine LNG gas supply equipment, which comprises an LNG storage tank, an LNG cold box and a gas filling station. The LNG cold box is arranged along a first direction with the LNG storage tank, and a pipeline system connected with the LNG storage tank is arranged in the LNG cold box. The gas filling station is arranged at the periphery of the LNG cold box in a detachable mode, so that the convenience of transportation of the marine LNG gas supply equipment is improved. The pipeline system has an external flange arranged on at least one side of two opposite sides of the LNG cold box along a second direction. The gas filling station comprises a gas filling process pipeline and a liquid collecting pool. The gas filling process pipeline is connected with the external flange and arranged along the first direction at the side of the LNG cold box. The liquid collecting pool is arranged below the gas filling process pipeline and arranged at the outer side of the LNG cold box in a detachable mode. The occupation space of the gas filling process pipeline at the front side of the LNG cold box is greatly reduced, so that the overall span occupation space of the marine LNG gas supply equipment is reduced.

Description

Technical Field

[0001] This application relates to the field of marine LNG supply technology, and more specifically, to a marine LNG supply device. Background Technology

[0002] LNG (liquefied natural gas), as a clean fuel, is increasingly being used in marine fuel applications. Current common practice for marine LNG refueling stations involves a single installation direction protruding from the cold container, with two main pipelines running side-by-side, and a collection tank located below them. This results in the entire system occupying a significant amount of space within the ship's hull, especially when designed and arranged at the stern, requiring consideration of safety clearances and other constraints. Furthermore, the current common practice is to weld the dual main pipelines to the internal piping of the cold container, and also to the outer wall when passing through compartments. Many collection tanks are also welded to the outer wall of the cold container. This makes transportation very inconvenient, occupies a large area, and often requires consideration of width restrictions.

[0003] In summary, how to solve the problems of large overall span space occupation and inconvenient transportation of marine LNG supply equipment has become a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0004] In view of this, this application provides a marine LNG supply equipment to solve the problems of large overall span space occupation and inconvenient transportation of marine LNG supply equipment.

[0005] To achieve the above objectives, this application provides the following technical solution:

[0006] A marine LNG supply system includes:

[0007] LNG storage tanks;

[0008] An LNG cold box is arranged along a first direction with the LNG storage tank, and the LNG cold box is equipped with a piping system connected to the LNG storage tank.

[0009] The gas station is detachably installed around the LNG cold box;

[0010] The pipeline system has an external flange located on at least one side of two opposite sides of the LNG cold box along a second direction. The gas filling station includes a gas filling process pipeline and a collection tank. The gas filling process pipeline is connected to the external flange and is arranged on the side of the LNG cold box along a first direction. The collection tank is located below the gas filling process pipeline and is detachably located on the outside of the LNG cold box. The first direction is the length direction of the LNG storage tank, and the second direction is the width direction of the LNG cold box.

[0011] In some embodiments, the gas refueling process pipeline extends along a first direction from the side of the LNG cold box to the front of the LNG cold box, and the gas refueling process pipeline has an interface flange for docking with the vessel to be refueled, the interface flange being located on the front of the LNG cold box.

[0012] In some embodiments, the maximum dimension of the gas station on the side of the LNG cold box along the second direction is 200mm±10mm, and the maximum dimension of the gas station extending outward from the front of the LNG cold box is 250mm±10mm.

[0013] In some embodiments, the collection tank is configured as an L-shaped groove collection tank, the L-shaped groove collection tank having a long groove section and a short groove section, the long groove section being located on the side of the LNG cold box and the short groove section being located on the front side of the LNG cold box; and the projection of the gas refueling process pipeline toward the collection tank along a third direction is located inside the collection tank, the third direction being the height direction of the LNG cold box.

[0014] In some embodiments, the external flange includes a first external flange and a second external flange, the interface flange includes a first interface flange and a second interface flange, the gas filling process pipeline includes an LNG liquid phase pipeline, an LNG gas phase pipeline and a nitrogen purging pipeline, one end of the LNG liquid phase pipeline is connected to the first external flange, the other end of the LNG liquid phase pipeline extends to the front of the LNG cold box and is connected to the first interface flange, one end of the LNG gas phase pipeline is connected to the second external flange, the other end of the LNG gas phase pipeline extends to the front of the LNG cold box and is connected to the second interface flange, and the nitrogen purging pipeline is interconnected with the LNG liquid phase pipeline and the LNG gas phase pipeline.

[0015] In some embodiments, the first external flange and the second external flange are arranged along the first direction, and the first external flange is arranged closer to the front side of the LNG cold box than the second external flange;

[0016] The LNG liquid phase pipeline is connected to the first external flange, then bends and extends along the first direction to the front of the LNG cold box and is connected to the first interface flange.

[0017] After the LNG vapor phase pipeline is connected to the second external flange, it bends and extends a predetermined distance toward the rear of the LNG cold box along the first direction, and then bends 180° along the third direction and extends along the first direction to the front of the LNG cold box and connects with the second interface flange; the third direction is the height direction of the LNG cold box.

[0018] In some embodiments, the first interface flange and the second interface flange are arranged along the second direction, and the LNG vapor phase pipeline extends to the front side of the LNG cold box and is connected to the second interface flange by bending.

[0019] In some embodiments, the collection tank is fixed to the outside of the LNG cold box by fasteners.

[0020] In some embodiments, the liquid collection tank includes a main body and a support portion disposed below the main body, the support portion being fixedly connected to the outside of the LNG cold box by fasteners.

[0021] In some embodiments, the LNG cold box is a double cold box or a single cold box.

[0022] In some embodiments, the gas station is located on one or both sides of two opposite sides of the LNG cold box along a second direction.

[0023] In some embodiments, the marine LNG supply equipment further includes a mobile mounting device, wherein the LNG storage tank, the LNG cold box, and the refueling station are all mounted on the mobile mounting device;

[0024] The mobile mounting device is a vehicle or a ship.

[0025] To address the issues of large space requirements and inconvenient transportation of marine LNG supply equipment, the marine LNG supply equipment provided in this application includes an LNG storage tank, an LNG cold box, and a refueling station. The LNG cold box and LNG storage tank are arranged along a first direction, and a pipeline system connected to the LNG storage tank is installed inside the LNG cold box. The refueling station is detachably installed on the periphery of the LNG cold box. The pipeline system has an external flange located on at least one side of two opposite sides of the LNG cold box along a second direction. The refueling station includes a refueling process pipeline and a collection tank. The refueling process pipeline is connected to the external flange and is arranged along the first direction on the side of the LNG cold box. The collection tank is located below the refueling process pipeline and is detachably installed on the outside of the LNG cold box. The first direction is the length direction of the LNG storage tank, and the second direction is the width direction of the LNG cold box. In practical applications, this marine LNG supply equipment offers several advantages. First, the refueling process pipelines of the refueling station are detachably connected to the external flanges on the outside of the LNG cold box, and the collection tank is also detachably connected to the outside of the LNG cold box. This means the refueling station is detachably located on the periphery of the LNG cold box, allowing the refueling station to be removed from the LNG cold box during transportation. This significantly reduces transportation difficulties caused by width restrictions and improves transportation convenience. Second, the external flanges of the pipeline system are located on at least one of the two opposite sides of the LNG cold box along the second direction. The refueling process pipelines are connected to the external flanges and arranged along the first direction on the side of the LNG cold box. The collection tank is located below the refueling process pipelines. This means the main structure of the refueling station extends along the first direction on the side of the LNG cold box, greatly reducing the space occupied by the refueling process pipelines on the front side of the LNG cold box. This helps to reduce the overall span space occupied by the marine LNG supply equipment.

[0026] The technical features mentioned above, those to be mentioned below, and those shown individually in the accompanying drawings can be combined arbitrarily, provided that the combined technical features are not contradictory. All feasible combinations of features are the technical content explicitly described herein. Any one of the multiple sub-features contained in the same statement can be applied independently, without necessarily being applied together with other sub-features. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1This is an isometric structural schematic diagram of a marine LNG supply equipment provided in an embodiment of this application;

[0029] Figure 2 This is a schematic diagram of the structure of a gas station located on the side of an LNG cold box, as provided in an embodiment of this application.

[0030] Figure 3 This is a schematic diagram of the structure of the interface flange provided in this application embodiment, which is located on the front side of the LNG cold box;

[0031] Figure 4 A top view of the marine LNG supply equipment provided in an embodiment of this application;

[0032] Figure 5 This is a schematic diagram illustrating the layout principle of a gas station provided in an embodiment of this application.

[0033] Explanation of reference numerals in the attached figures:

[0034] 1-LNG storage tank;

[0035] 2-LNG cold box;

[0036] 3-Gas refueling station;

[0037] 31-Gas filling process pipeline;

[0038] 311-LNG liquid phase pipeline;

[0039] 312-LNG vapor phase pipeline;

[0040] 313 - Nitrogen purging pipeline;

[0041] 32-collection tank;

[0042] 32a - Main body of the liquid collection tank;

[0043] 32b - Support section;

[0044] 321 - Long trough section;

[0045] 322-Short slot section;

[0046] 323 - Liquid collecting tube;

[0047] 324-drain pipe;

[0048] 33-Interface flange;

[0049] 331 - First interface flange;

[0050] 332 - Second interface flange;

[0051] 4-External flange;

[0052] 41-First external flange;

[0053] 42 - Second external flange;

[0054] 5 - Sampling port;

[0055] 50 - Sampling tubing;

[0056] 6-Valve body. Detailed Implementation

[0057] The core of this application is to provide a marine LNG supply equipment to solve the problems of large overall span space occupation and inconvenient transportation of marine LNG supply equipment.

[0058] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0059] LNG (liquefied natural gas), as a clean fuel, is increasingly being used in marine fuel applications. Current common practice for marine LNG refueling stations involves a single installation direction protruding from the cold container, with two main pipelines running side-by-side, and a collection tank located below them. This results in the entire system occupying a significant amount of space within the ship's hull, especially when designed and arranged at the stern, requiring consideration of safety clearances and other constraints. Furthermore, the current common practice is to weld the dual main pipelines to the internal piping of the cold container, and also to the outer wall when passing through compartments. Many collection tanks are also welded to the outer wall of the cold container. This makes transportation very inconvenient, occupies a large area, and often requires consideration of width restrictions.

[0060] Based on this, this application provides a marine LNG supply equipment to solve the problems of large overall span space occupation and inconvenient transportation of marine LNG supply equipment.

[0061] Specifically, refer to Figures 1-5 As shown, the above-mentioned marine LNG supply equipment includes an LNG storage tank 1, an LNG cold box 2, and a refueling station 3.

[0062] Among them, LNG storage tank 1 is mainly used to store liquefied natural gas. Its structure is generally a cylindrical tank structure that is placed flat. Of course, it can also be a tank structure of other shapes. No further specific restrictions are made here.

[0063] The LNG cold box 2 and the LNG storage tank 1 are arranged along the first direction. The LNG cold box 2 is equipped with a pipeline system connected to the LNG storage tank 1. The pipeline system includes a vaporizer, a buffer tank, and various connecting pipelines. The LNG cold box 2 is a sealed box mainly used to cool the relevant pipelines and devices inside. Its sealing performance can prevent the ultra-low temperature of LNG leakage from causing corrosion damage to the equipment mounted on the marine LNG supply equipment (such as the corresponding ship deck when mounted on a ship).

[0064] The gas station 3 is detachably installed on the periphery of the LNG cold box 2. The main purpose of the gas station 3 is to refuel the ship, specifically by inputting the LNG fuel from the LNG storage tank 1 into the ship's LNG-related equipment.

[0065] Specifically, the pipeline system has an external flange 4 located on at least one side of two opposite sides of the LNG cold box 2 along the second direction. The gas filling station 3 includes a gas filling process pipeline 31 and a collection tank 32. The gas filling process pipeline 31 is connected to the external flange 4 and is arranged on the side of the LNG cold box 2 along the first direction. The collection tank 32 is located below the gas filling process pipeline 31. The collection tank 32 is mainly used to collect LNG fuel that may leak from the gas filling process pipeline 31. The collection tank 32 is detachably located on the outside of the LNG cold box 2. The first direction is the length direction of the LNG storage tank 1, and the second direction is the width direction of the LNG cold box 2.

[0066] In practical application, this marine LNG supply equipment offers several advantages. First, because the refueling process pipeline 31 of the refueling station 3 is detachably connected to the external flange 4 on the outside of the LNG cold box 2, and the collection tank 32 is also detachably connected to the outside of the LNG cold box 2, the refueling station 3 is detachably located on the periphery of the LNG cold box 2. This allows the marine LNG supply equipment to be removed from the LNG cold box 2 during transportation, significantly reducing transportation difficulties caused by factors such as width restrictions and improving transportation convenience. Second, because the external flange 4 of the pipeline system is located on at least one of the two opposite sides of the LNG cold box 2 along the second direction, the refueling process pipeline 31 is connected to the external flange 4 and arranged along the first direction on the side of the LNG cold box 2, and the collection tank 32 is located below the refueling process pipeline 31, the main structure of the refueling station 3 extends along the first direction on the side of the LNG cold box 2, greatly reducing the space occupied by the refueling process pipeline 31 on the front side of the LNG cold box 2, thereby helping to reduce the overall span space occupied by the marine LNG supply equipment.

[0067] It's worth noting that the aforementioned LNG cold box 2 can adopt either a dual-cold-box structure or a single-cold-box structure. The dual-cold-box structure specifically includes two separate, sealed cold box cavities, each equipped with its own piping system. This means one sealed cold box cavity corresponds to one gas supply system, offering higher safety performance. If one gas supply system malfunctions and requires maintenance, the system can be immediately switched to the other, allowing personnel to safely enter the faulty cold box for repairs without being affected by the LNG's low temperature. Conversely, a single-cold-box structure can also accommodate one or two piping systems. For example, a single cold box can use one cold box to correspond to two gas supply systems. While this reduces costs, personnel repairing a faulty gas supply system in the cold box will be exposed to the low temperature of the other LNG system for an extended period, increasing the risk of frostbite. Furthermore, in some existing LNG gas supply systems, the two gas supply systems are independent and not interconnected. When one system malfunctions, the other gas supply system must be preheated before the faulty system can be stopped; otherwise, the gas supply will be interrupted. During the period when the gas supply system continues to supply gas during a malfunction, not only will energy be wasted, but the concentration of natural gas in the cold box will also increase, posing a risk of deflagration.

[0068] In some specific implementations, the aforementioned refueling process pipeline 31 extends along a first direction from the side of the LNG cold box 2 to the front of the LNG cold box 2. The refueling process pipeline 31 has an interface flange 33 for docking with the vessel to be refueled. The interface flange 33 is located on the front of the LNG cold box 2. It should be noted that the LNG cold box 2 is generally designed with a maintenance hatch, and the front of the LNG cold box 2 refers to the side of the LNG cold box 2 corresponding to the designed maintenance hatch. By designing the interface flange 33 on the front of the LNG cold box 2, it is more convenient for it to dock with the vessel to be refueled. Of course, it is understood that this design is merely an example of an embodiment of this application, and in actual applications, it can be designed in other locations, without further specific limitations here.

[0069] In traditional marine LNG supply equipment, the refueling station 3 is directly arranged in front of the LNG cold box 2, which generally requires at least 500mm of space along the first direction in front of the LNG cold box 2.

[0070] To reduce the span of the entire marine LNG supply system along the first direction, the maximum dimension of the refueling station 3 along the second direction on the side of the LNG cold box 2 can be designed to be 200mm ± 10mm, and the maximum extension of the refueling station 3 to the front of the LNG cold box 2 can be designed to be 250mm ± 10mm. This design satisfies the space requirements for the refueling station 3 while ensuring the front docking of the LNG cold box 2, significantly reducing the space occupied by the refueling station 3 within the LNG cold box 2 and thus reducing the span of the entire marine LNG supply system.

[0071] In some other specific implementation schemes, refer to Figure 1 Combination Figure 4 As shown, the aforementioned collection tank 32 can be specifically constructed as an L-shaped groove collection tank, meaning the top opening of the collection tank 32 is L-shaped. The L-shaped groove collection tank has a long section 321 and a short section 322. Here, "long" and "short" are relative concepts, specifically representing the length of the groove section. The long section 321 is located on the side of the LNG cold box 2, and the short section 322 is located on the front side of the LNG cold box 2. Furthermore, the projection of the gas filling process pipeline 31 along a third direction toward the collection tank 32 is located inside the collection tank 32, ensuring that the collection tank 32 can effectively receive leaks. The third direction is the height direction of the LNG cold box 2. By designing this structure, the entire gas filling station 3 is situated within a rectangular space on the opposite side of the LNG cold box 2 along the second direction, and also within a relatively small rectangular space on the front side of the LNG cold box 2, thus facilitating the centralized layout of the gas filling station 3.

[0072] In some specific implementation plans, refer to Figure 2 As shown, the aforementioned external flange 4 may specifically include a first external flange 41 and a second external flange 42, as indicated by reference. Figure 3 and Figure 5 As shown, the interface flange 33 may specifically include a first interface flange 331 and a second interface flange 332. The gas refueling process pipeline 31 specifically includes an LNG liquid phase pipeline 311, an LNG gas phase pipeline 312, and a nitrogen purging pipeline 313. One end of the LNG liquid phase pipeline 311 is connected to the first external flange 41, and the other end of the LNG liquid phase pipeline 311 extends to the front of the LNG cold box 2 and is connected to the first interface flange 331. The LNG liquid phase pipeline 311 is mainly used to supply LNG fuel. One end of the LNG gas phase pipeline 312 is connected to the second external flange 42, and the other end of the LNG gas phase pipeline 312 extends to the front of the LNG cold box 2 and is connected to the second interface flange 332. The LNG gas phase pipeline 312 is mainly used for gas return. The nitrogen purging pipeline 313 is interconnected with the LNG liquid phase pipeline 311 and the LNG gas phase pipeline 312. The nitrogen purging pipeline 313 is a key safety assurance system. It achieves its core purpose of removing oxygen, replacing flammable gases, preventing explosions, and keeping pipelines dry by injecting inert nitrogen into LNG liquid and gaseous pipelines. It is an essential standard safety procedure component for all pipeline systems involving flammable and explosive media during start-up, shutdown, switching, and maintenance operations.

[0073] In a further implementation plan, refer to Figure 2 and Figure 3As shown, the first external flange 41 and the second external flange 42 are arranged along the first direction, with the first external flange 41 positioned closer to the front of the LNG cold box 2 than the second external flange 42. The LNG liquid phase pipeline 311 connects to the first external flange 41, bends, and extends along the first direction to the front of the LNG cold box 2, connecting with the first interface flange 331. The LNG gas phase pipeline 312 connects to the second external flange 42, bends, and extends along the first direction towards the rear of the LNG cold box 2 a predetermined distance, then bends 180° along a third direction (e.g., downward or upward) and extends along the first direction to the front of the LNG cold box 2, connecting with the second interface flange 332. The third direction is the height direction of the LNG cold box 2. This design allows the LNG liquid phase pipeline 311 and the LNG gas phase pipeline 312 to be arranged in a vertically layered manner (specifically, the LNG liquid phase pipeline 311 can be located above the LNG gas phase pipeline 312, or the LNG gas phase pipeline 312 can be located above the LNG liquid phase pipeline 311), which is more conducive to reducing the space occupied. It is understood that the above arrangement is merely an example of the embodiments of this application. In actual application, other arrangements can be designed, and no more specific limitations are made here.

[0074] In a further implementation plan, refer to Figure 3 As shown, the first interface flange 331 and the second interface flange 332 can be specifically designed to be arranged along the second direction. The LNG vapor phase pipeline 312 extends to the front side of the LNG cold box 2 and then connects to the second interface flange 332 through a bend. This design allows the first interface flange 331 and the second interface flange 332 to be arranged side by side, making it easier to dock with the ship to be refueled.

[0075] In some specific implementation schemes, the aforementioned liquid collection pool 32 can be fixed to the outside of the LNG cold box 2 by fasteners, or it can be fixed to the outside of the LNG cold box 2 by other detachable fixing methods, such as fixing by fixing buckles.

[0076] In a further implementation plan, refer to Figure 1 and Figure 2 As shown, the aforementioned liquid collection tank 32 may specifically include a main body 32a and a support 32b disposed below the main body 32a. The support 32b is mainly used to support and fix the main body 32a. The support 32b is fixedly connected to the outside of the LNG cold box 2 by fasteners. The main body 32a and the support 32b can be designed as separate fixed connections, such as fastener connections; or they can be designed as an integral structure, such as a welded connection or a one-piece molding. By designing the support 32b, the structure of the main body 32a is made more stable and reliable, and easier to disassemble and install.

[0077] In some other specific implementation schemes, the gas station 3 can be set on one of the two opposite sides of the LNG cold box 2 along the second direction, or it can be set on both opposite sides of the LNG cold box 2 along the second direction. The configuration can be selected according to actual needs during the specific application process.

[0078] On the other hand, traditional methods for refueling marine LNG mainly include shore-based and barge-based refueling stations. The construction of shore-based refueling stations requires complex pipeline systems and fixed facilities, places stringent requirements on shoreline conditions, has a long construction period, and requires substantial investment. While barge-based refueling stations are relatively flexible, they are significantly constrained by water level differences and navigation conditions.

[0079] For example, the water level in the Chongqing section of the Yangtze River varies by about 30 meters, and the horizontal position of the shoreline can change by up to 160 meters. This makes it difficult for LNG pipelines to adapt, greatly limiting the widespread adoption of LNG-powered ships. Furthermore, the significant water level difference between the dry and wet seasons in inland waterways means that the adaptability requirements for LNG pipeline systems during ship refueling are far higher than those for LNG refueling systems on land-based vehicles and LNG carrier loading and unloading systems at sea.

[0080] Based on this, the marine LNG supply equipment provided in this application may also include a mobile mounting device, in which the LNG storage tank 1, the LNG cold box 2 and the refueling station 3 are all mounted; wherein, the mobile mounting device may be a vehicle or a ship.

[0081] For example, when the mobile refueling unit is a vehicle (hereinafter referred to as a refueling truck), the refueling truck is driven alongside the ship when it is docked, connected to the refueling pipeline, and directly supplies gas to the ship's LNG dual-cooled tanks. Mobile refueling trucks can flexibly move between different docks and ships without relying on complex shore-based infrastructure. This method can quickly respond to the refueling needs of ships, and is particularly suitable for temporary docking points or areas with inadequate shore-based refueling facilities. However, the refueling capacity of mobile refueling trucks is relatively limited, and multiple refueling trips may be required to meet the needs of large ships. Furthermore, ensuring a safe connection between the vehicle and the ship and a stable gas supply during the refueling process requires high standards of operation and safety precautions.

[0082] For example, mobile refueling equipment can be vessels (hereinafter referred to as gas refueling ships), mainly used in scenarios where multiple LNG-powered vessels are clustered together. In such cases, gas refueling can be carried out using gas refueling ships. These ships are equipped with large-capacity LNG storage tanks and complete refueling equipment. After docking at a suitable location, they supply gas to the dual-cooled tanks of surrounding vessels sequentially via connecting pipelines. This solution can fully utilize the resources of gas refueling ships, reduce the pressure on shore-based refueling facilities, and provide a flexible refueling option for areas with multiple vessels operating together. However, the implementation of this solution requires reasonable planning of the docking location and refueling sequence of the main gas supply vessel to ensure an efficient and safe refueling process, and close cooperation among multiple vessels to coordinate refueling time and demand.

[0083] Furthermore, to help those skilled in the art better understand the marine LNG supply equipment provided in the embodiments of this application, the following references are made. Figure 1 Combination Figure 5 The layout principle of its gas station 3 is briefly explained below:

[0084] A refueling station 3 is arranged on one of the two opposite sides along the second direction of the LNG cold box 2. Three main pipelines are led out from the side of the LNG cold box 2: an LNG liquid phase pipeline 311, an LNG gas phase pipeline 312, and a nitrogen purging pipeline 313. The nitrogen purging pipeline 313 is connected to both the LNG liquid phase pipeline 311 and the LNG gas phase pipeline 312 via pipelines and is equipped with corresponding valves 6 to control the opening and closing of the valves 6 to purge the corresponding pipelines. The distal end of the LNG liquid phase pipeline 311 is equipped with a first interface flange 331 for docking with the liquid phase interface of the vessel to be refueled. The distal end of the LNG gas phase pipeline 312 is equipped with a second interface flange 332 for docking with the gas phase interface of the vessel to be refueled. The end of the nitrogen purging pipeline 313 is equipped with a nitrogen purging port for docking with the purging interface of the vessel to be refueled.

[0085] In addition, the gas station 3 can also be equipped with a sampling port 5 to facilitate sampling of the fuel flowing through the LNG liquid phase pipeline 311 and the LNG gas phase pipeline 312. Specifically, a sampling pipeline 50 connecting the LNG liquid phase pipeline 311 and the LNG gas phase pipeline 312 can be set up. Two valve bodies 6 are designed on the sampling pipeline 50, and the sampling port 5 is connected to the sampling pipeline 50 and located between the two valve bodies 6. Thus, sampling of different pipelines can be achieved by switching the opening and closing of the valve bodies 6.

[0086] Furthermore, a corresponding collection pipe 323 can be connected to the side of the collection tank 32 to collect the leaked liquid collected in the collection tank 32 into a designated container. The collection pipe 323 is positioned at the maximum height set by the liquid level on the side of the collection tank 32. When the liquid level in the collection tank 32 is higher than the maximum height set by the liquid level, the liquid can be automatically collected into the designated container through the collection pipe 323. In addition, a drain pipe 324 can be designed at the bottom of the collection tank 32 to drain the liquid at the bottom of the collection tank 32.

[0087] It should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0088] As indicated in this application and claims, unless the context clearly indicates otherwise, the words "a," "an," "a," and / or "the" are not specifically singular and may include the plural. Generally, the terms "comprising" and "including" only indicate the inclusion of expressly identified steps and elements, which do not constitute an exclusive list, and the method or apparatus may also include other steps or elements. An element defined by the phrase "comprising an..." does not exclude the presence of other identical elements in the process, method, product, or apparatus that includes the element.

[0089] In the description of the embodiments of this application, unless otherwise stated, " / " means "or", for example, A / B can mean A or B; "and / or" in this document is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Furthermore, in the description of the embodiments of this application, "multiple" refers to two or more.

[0090] It should also be noted that in the description of the embodiments of this application, the terms "first" and "second" are used only for the purpose of distinguishing descriptions and should not be construed as indicating or implying relative importance, nor should they be construed as indicating or implying order.

[0091] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are only for the purpose of helping to understand the core ideas of this application. It should be noted that those skilled in the art can make several improvements and modifications to this application without departing from the principles of this application, and these improvements and modifications also fall within the protection scope of the claims of this application.

Claims

1. A marine LNG supply system, characterized in that, include: LNG storage tank (1); An LNG cold box (2) is arranged along a first direction with the LNG storage tank (1), and the LNG cold box (2) is provided with a pipeline system connected to the LNG storage tank (1); The gas station (3) is detachably installed on the periphery of the LNG cold box (2); The pipeline system has an external flange (4) located on at least one side of the LNG cold box (2) along two opposite sides in a second direction. The gas station (3) includes a gas filling process pipeline (31) and a collection tank (32). The gas filling process pipeline (31) is connected to the external flange (4) and is arranged on the side of the LNG cold box (2) along a first direction. The collection tank (32) is located below the gas filling process pipeline (31) and is detachably located on the outside of the LNG cold box (2). The first direction is the length direction of the LNG storage tank (1), and the second direction is the width direction of the LNG cold box (2).

2. The marine LNG supply equipment as described in claim 1, characterized in that, The gas refueling process pipeline (31) extends along a first direction from the side of the LNG cold box (2) to the front side of the LNG cold box (2). The gas refueling process pipeline (31) has an interface flange (33) for docking with the vessel to be refueled. The interface flange (33) is located on the front side of the LNG cold box (2).

3. The marine LNG supply equipment as described in claim 2, characterized in that, The maximum dimension of the gas station (3) on the side of the LNG cold box (2) along the second direction is 200mm±10mm, and the maximum dimension of the gas station (3) extending to the front of the LNG cold box (2) is 250mm±10mm.

4. The marine LNG supply equipment as described in claim 2, characterized in that, The collection tank (32) is constructed as an L-shaped groove collection tank, with a long groove section (321) and a short groove section (322) in the L-shaped groove collection tank. The long groove section (321) is located on the side of the LNG cold box (2), and the short groove section (322) is located on the front side of the LNG cold box (2). The projection of the gas filling process pipeline (31) toward the collection tank (32) along a third direction is located on the inner side of the collection tank (32), where the third direction is the height direction of the LNG cold box (2).

5. The marine LNG supply equipment as described in claim 2, characterized in that, The external flange (4) includes a first external flange (41) and a second external flange (42). The interface flange (33) includes a first interface flange (331) and a second interface flange (332). The gas filling process pipeline (31) includes an LNG liquid phase pipeline (311), an LNG gas phase pipeline (312), and a nitrogen purging pipeline (313). One end of the LNG liquid phase pipeline (311) is connected to the first external flange (41), and the other end of the LNG liquid phase pipeline (311) extends to the front of the LNG cold box (2) and is connected to the first interface flange (331). One end of the LNG gas phase pipeline (312) is connected to the second external flange (42), and the other end of the LNG gas phase pipeline (312) extends to the front of the LNG cold box (2) and is connected to the second interface flange (332). The nitrogen purging pipeline (313) is interconnected with the LNG liquid phase pipeline (311) and the LNG gas phase pipeline (312).

6. The marine LNG supply equipment as described in claim 5, characterized in that, The first external flange (41) and the second external flange (42) are arranged along the first direction, and the first external flange (41) is arranged closer to the front side of the LNG cold box (2) relative to the second external flange (42); The LNG liquid phase pipeline (311) is connected to the first external flange (41), then bends and extends along the first direction to the front of the LNG cold box (2) and is connected to the first interface flange (331). After the LNG vapor phase pipeline (312) is connected to the second external flange (42), it bends and extends a predetermined distance along the first direction toward the rear side of the LNG cold box (2), and then bends 180° along the third direction and extends along the first direction to the front side of the LNG cold box (2) and connects with the second interface flange (332); the third direction is the height direction of the LNG cold box (2).

7. The marine LNG supply equipment as described in claim 6, characterized in that, The first interface flange (331) and the second interface flange (332) are arranged along the second direction. The LNG gas phase pipeline (312) extends to the front side of the LNG cold box (2) and then connects to the second interface flange (332) by bending.

8. The marine LNG supply equipment as described in claim 1, characterized in that, The liquid collection tank (32) is fixed to the outside of the LNG cold box (2) by fasteners.

9. The marine LNG supply equipment as described in claim 8, characterized in that, The liquid collection tank (32) includes a main body (32a) and a support (32b) disposed below the main body (32a). The support (32b) is fixedly connected to the outside of the LNG cold box (2) by fasteners.

10. The marine LNG supply equipment as described in claim 1, characterized in that, The LNG cold box (2) can be a double cold box or a single cold box.

11. The marine LNG supply equipment as described in claim 1, characterized in that, The gas station (3) is located on one or both sides of the two opposite sides of the LNG cold box (2) along the second direction.

12. The marine LNG supply equipment as described in any one of claims 1-11, characterized in that, It also includes a mobile mounting device, wherein the LNG storage tank (1), the LNG cold box (2) and the gas station (3) are all mounted on the mobile mounting device; The mobile mounting device is a vehicle or a ship.

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