Piping system for injecting and pressurizing liquefied gas into storage tanks.

Abstract

This invention relates to a pipeline system for pressurizing and supplying liquefied petroleum gas (LPG) storage tanks with a spray system. This system serves three functions: acting as a spray inlet to ensure uniform cooling of the tank during hot refueling; acting as a self-pressurizing return port; and acting as a gas-phase supply port. The pipeline system includes a main body located within the tank cavity, comprising a main pipeline extending longitudinally from the tank's bow head, and branch pipelines extending to both sides of the main pipeline. The outer ends of the branch pipelines extend axially along the tank to form a spray-pressurizing and supply section. This section is sealed at its port and has multiple inlet and outlet ports. The connection point between the inner end of the branch pipeline and the main pipeline is always within the gas phase space. By placing the connection point between the main pipeline and the branch pipeline within the gas phase space, the system ensures normal pressurization and supply of gas during the tank's movement with the ship, while maintaining the spray function, thus providing an anti-tilting effect.

Description

Technical Field

[0001] This invention relates to the field of liquefied gas storage tanks, and further to a pipeline system for injecting and pressurizing liquefied gas into storage tanks. Background Technology

[0002] In the field of cryogenic liquefied gas storage tanks, these tanks typically function as filling spray systems, pressurization systems, and gas supply systems. To achieve these functions, a piping system with a specific structure must be installed within the tank. The filling rate of a cryogenic liquid storage tank generally ranges from 80% to 95%, depending on the tank's volume and the stored medium. The pressurization and gas phase supply of a cryogenic liquefied gas storage tank usually share a single piping system, located in the upper gas phase space of the tank. This is because if the pressurization pipeline is submerged in the cryogenic liquefied gas, the gas flowing out of the pressurization pipeline will be directly liquefied, preventing pressurization.

[0003] The refueling spray pressurization gas supply pipeline, arranged within the gas phase space of the storage tank, typically shares a single tank inlet for ease of manufacturing and cost reduction. A single pipeline is usually designed inside the tank, with one end directly connected to the tank bow head and the other extending to the stern. This pipeline has continuous, evenly distributed small holes for uniformly cooling the hot tank during refueling, preventing damage from uneven heating, and also serving as a channel for pressurized return gas and external gas supply. This pipeline arrangement works normally in a fixed state, but if the tank tilts, especially marine cryogenic liquefied gas storage tanks which are frequently tilted and swaying, the refueling spray pressurization gas supply pipeline system may be submerged in liquefied gas and malfunction. This problem is usually mitigated by reducing the tank fill rate, but under a fixed load capacity, reducing the fill rate not only significantly increases equipment costs but also limits its implementation due to the overall size of the equipment, and this method does not solve the fundamental problem. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a pipeline system for refueling and pressurizing liquefied gas storage tanks. By dividing the entire pipeline system into main pipelines and branch pipelines, the connection points between the main pipelines and branch pipelines are always kept within the gas phase space. The branch pipelines are arranged in a way that ensures that at least one branch pipeline can provide pressurized gas supply under different tilting conditions. This ensures that the pipeline system can provide normal pressurized gas supply while the storage tank is swaying with the ship, thus achieving an anti-tilting effect for the storage tank.

[0005] Specifically, the present invention provides a pipeline system for injecting and pressurizing liquefied gas into a storage tank, comprising:

[0006] The main pipeline body is located inside the storage tank and includes a main pipeline extending longitudinally from the tank head along the storage tank and branch pipelines extending to both sides from the main pipeline. The outer end of the branch pipeline extends axially along the storage tank to form a filling spray pressurization gas supply section. The filling spray pressurization gas supply section has a closed port and multiple air inlet and outlet holes on the pipe body. The connection between the inner end of the branch pipeline and the main pipeline is always in the gas phase space.

[0007] In some embodiments, the branch pipeline further includes a connecting section for connecting the refueling spray pressurization gas supply section to the main pipeline. The refueling spray pressurization gas supply section is formed by extending the outer end of the connecting section in the reverse direction along the axial direction of the storage tank or by extending the outer end of the connecting section along the axial direction of the storage tank to both ends. The fact that the gas supply section extends from the outer end of the connecting section along the axial direction of the storage tank or to both ends ensures that branch pipelines are arranged on both sides of the connecting section. When the storage tank tilts forward or backward, the refueling spray pressurization gas supply section on one side can always perform normal pressurization gas supply. Simultaneously, the connecting section has a certain length, allowing the refueling spray pressurization gas supply section to be located on both sides of the main pipeline. When the storage tank tilts to the left or right, the refueling spray pressurization gas supply section on one side can still perform normal pressurization gas supply.

[0008] In some embodiments, the branch pipes are multiple sets arranged vertically within the storage tank. The longitudinal arrangement of the branch pipes within the tank provides them with a certain height, reducing the probability of all branch pipes being submerged. Even if the lower pipes are submerged, the upper pipes can still provide pressurized gas supply normally.

[0009] In some embodiments, the main pipeline extends to the central cross-section of the storage tank and connects to the connecting section, with the refueling spray pressurization gas supply section symmetrically arranged on both sides of the main pipeline. When the main pipeline extends to the central cross-section of the storage tank and connects to the connecting section, the connecting part is positioned centrally, ensuring that the connecting part is as close to the gas phase space as possible regardless of the tilt state. This also ensures normal pressurization operation even under tilting and swaying conditions for storage tanks with high filling rates or smaller sizes. Furthermore, the symmetrical arrangement of the refueling spray pressurization gas supply section on both sides of the main pipeline also ensures that the refueling spray pressurization gas supply section is as close to the gas phase space as possible, enabling normal pressurization gas supply operation.

[0010] According to another aspect of the present invention, a pipeline system for injecting and pressurizing liquefied gas into a storage tank is further provided, comprising:

[0011] The pipeline body is located inside the storage tank and includes a main pipeline extending longitudinally from the tank head along the storage tank, and a branch pipeline connected to the main pipeline. The branch pipeline extends axially along the storage tank from the connection point with the main pipeline to form a filling spray pressurization gas supply section. The filling spray pressurization gas supply section has a closed port and multiple air inlet and outlet holes on the pipe body. The connection point between the inner end of the branch pipeline and the main pipeline is always in the gas phase space.

[0012] In some embodiments, the refueling spray pressurization gas supply section extends to both ends of the tank, and the branch pipelines are arranged along the entire longitudinal direction of the tank to ensure that the spraying effect can be achieved during refueling.

[0013] In some embodiments, the air inlets and outlets are evenly distributed throughout the branch pipeline. By placing the air inlets and outlets throughout the branch pipeline, it can be ensured that as many air inlets and outlets as possible are in the gas phase space when the storage tank tilts or shakes, maintaining the normal pressurization and gas supply function of the storage tank. At the same time, the even distribution of air inlets and outlets throughout the filling spray pressurization and gas supply section can also ensure uniform spraying during spraying operations.

[0014] In some implementations, the main pipeline and the branch pipelines are connected to each other by right-angle pipes or tee pipes, which facilitates installation and disassembly.

[0015] In some embodiments, the main pipeline extends downwards for a certain distance and then upwards to the top of the storage tank into the gas phase space, forming a downward bending structure. The bending structure can buffer the gas to a certain extent and can also intercept the liquid carried in the gas when the pipeline is supplying gas, so as to prevent the supplied gas from carrying liquefied gas, which would rapidly expand and vaporize when heated in the external pipeline, causing pressure on the external pipeline.

[0016] In some embodiments, pipe clamps are installed on the branch pipes for fixing them to the inner wall of the storage tank. Fixing the pipeline system with pipe clamps ensures its stability when the storage tank tilts or shakes, preventing displacement or detachment that could affect normal pressurization and gas supply.

[0017] Compared with the prior art, the present invention has at least one of the following beneficial effects:

[0018] 1. Unlike existing technologies that use only one pipeline for refueling, spraying, pressurization, and gas supply, this application divides the pipeline system into a main pipeline and branch pipelines. Each branch pipeline includes a refueling, spraying, pressurization, and gas supply section. This section has a closed port and multiple inlet and outlet ports on its body, allowing for refueling, spraying, pressurization, and gas supply operations. By dividing the pipeline system into a main pipeline and branch pipelines, and placing the connection points between the main pipeline and branch pipelines within the gas phase space, the pipeline system can still perform pressurization and gas supply operations even if some branch pipelines are submerged in the liquid phase gas, as long as some branch pipelines are not submerged. Specifically, when the storage tank tilts to the left, submerging the left-side pipeline, the right-side branch pipeline remains in the gas phase space and can continue to pressurize and supply gas normally. Similarly, the storage tank can also operate normally when tilted to the right. When the bow of the storage tank tilts and submerges the branch pipes extending to the stern, the branch pipes extending to the bow remain in the gas phase space and can continue to pressurize and supply gas normally. Similarly, the storage tank can still operate normally when it tilts to the stern. For marine LNG and liquid oxygen cryogenic storage tanks, this arrangement ensures a stable gas and oxygen supply during storms and impacts, guaranteeing the normal operation of marine machinery.

[0019] 2. The pipeline system of this application has three functions: as a filling spray port to ensure that the tank body is uniformly cooled during the filling process of the hot storage tank; as a self-pressurized return gas port; and as a gas phase supply port.

[0020] 3. The simplest implementation method for this pipeline is to connect two branch pipelines to one main pipeline. The layout is simple, the structure is low, and it is stable and reliable.

[0021] 4. In addition to cryogenic liquefied gas storage tanks for ships, it can be extended to other similar cryogenic storage tank application scenarios, with a wide range of applications. Attached Figure Description

[0022] The preferred embodiments will now be described in a clear and easy-to-understand manner, in conjunction with the accompanying drawings, to further explain the above-mentioned characteristics, technical features, advantages, and implementation methods of the present invention.

[0023] Figure 1 This is a partially enlarged view of the connection between the connecting section and the injection spray pressurization gas supply section of the present invention;

[0024] Figure 2 This is a schematic diagram of a partial arrangement of the air inlet and outlet ports of the present invention;

[0025] Figure 3 This is a schematic diagram of the pipeline system structure according to Embodiment 1 of the present invention;

[0026] Figure 4 This is a schematic diagram of the pipeline system structure in Embodiment 2 of the present invention;

[0027] Figure 5This is a schematic diagram of the pipeline system structure in Embodiment 3 of the present invention; Figure 6 This is a schematic diagram of a pipeline system provided by the present invention under a stable state; Figure 7 This is a schematic diagram of a pipeline system in a forward or backward tilted state provided by the invention; Figure 8 This is a schematic diagram of a pipeline system in a left-right tilted state provided by the invention; Figure 9 This is a schematic diagram of a pipeline system for spraying operations provided by the invention.

[0028] Explanation of icon numbers:

[0029] Main pipe 1, end cap pipe connector 11, first main pipe 12, second main pipe 13

[0030] Branch pipe 2, spray booster gas supply section 21, pipe 1 211, pipe 2 212, pipe 3 213, pipe 4 214, pipe 5 215, pipe 6 216, connecting section 22, connecting section 1 221, connecting section 2 222, air inlet / outlet 23, pipe clamp 24, pipe plug 25.

[0031] Connection part 3;

[0032] Boost outlet 4. Detailed Implementation

[0033] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without any creative effort.

[0034] To keep the drawings concise, each figure only schematically shows the parts relevant to the invention, and these do not represent the actual structure of the product. Furthermore, to facilitate understanding, in some figures, only one of components with the same structure or function is schematically depicted, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one."

[0035] It should also be further understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0036] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0037] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0038] In one embodiment, refer to the appendix to the specification. Figure 1 Appendix Figure 2 and attached Figure 5 The present invention provides a pipeline system for refueling and pressurizing gas supply for liquefied gas storage tanks, including a pipeline body located inside the storage tank. The pipeline body includes a main pipeline 1 extending longitudinally from the tank head along the tank and branch pipelines 2 extending from the main pipeline 1 to both sides. The outer end of the branch pipeline 2 extends axially along the storage tank to form a refueling and pressurizing gas supply section 21. The refueling and pressurizing gas supply section 21 is closed at the port and has multiple inlet and outlet holes 23 on the pipe body. The connection part 3 between the inner end of the branch pipeline 2 and the main pipeline 1 is always in the gas phase space.

[0039] The specific manner in which the main pipeline 1 and the branch pipeline 2 extend axially along the tank body is not limited; they can extend in a straight line or in a curved manner, as long as they generally extend axially, they fall within the protection scope of this invention. The port of the branch pipeline 2 can be sealed by the pipe plug 25. The location of the connection part 3 between the main pipeline 1 and the branch pipeline 2 can be determined according to the filling rate of the storage tank or the size of the storage tank.

[0040] In a preferred embodiment, refer to the appendix to the specification. Figure 5 Branch pipe 2 also includes a connecting section 22 for connecting the refueling spray pressurization gas supply section 21 to the main pipe 1. The refueling spray pressurization gas supply section 21 is formed by extending the outer end of the connecting section 22 in the opposite direction along the axial direction of the storage tank, or by extending the outer end of the connecting section 22 in both directions along the axial direction of the storage tank. The connecting section 22 is mainly used to connect the main pipe 1 and the refueling spray pressurization gas supply section 21 and to transmit gas. The refueling spray pressurization gas supply sections 21 are arranged in parallel. The connecting sections 22 are the parts of the pipeline located on both sides of the main pipe 1 and connected to the refueling spray pressurization gas supply section 21. That is, the pipeline can be in a "Z" shape or an "H" shape. This ensures that no matter if there is a left tilt, right tilt, bow tilt or stern tilt, there is always a branch pipe 2 that can carry out normal pressurization gas supply.

[0041] In a preferred embodiment, the branch pipes 2 are multiple sets arranged vertically inside the storage tank. The branch pipes 2 are arranged longitudinally or in layers inside the storage tank, so that the branch pipes 2 have a certain height. When the tank tilts and shakes, the vertically arranged branch pipes 2 are less likely to be completely submerged. When the lower branch pipes 2 are submerged, the upper branch pipes 2 can still perform pressurization and gas supply.

[0042] According to another aspect of the invention, reference is made to the appended specification. Figure 3 Furthermore, a pipeline system for injecting and pressurizing liquefied gas into a storage tank is provided, comprising a pipeline body disposed within the inner cavity of the storage tank. The pipeline body includes a main pipeline 1 extending longitudinally from the tank bow head along the storage tank, and a branch pipeline 2 connected to the main pipeline 1. The branch pipeline 2 extends axially from its connection point 3 with the main pipeline 1 along the storage tank to form an injecting and pressurizing gas supply section 21. The injecting and pressurizing gas supply section 21 has a closed port and multiple inlet and outlet ports 23 on its body. The connection point 3 between the inner end of the branch pipeline 2 and the main pipeline 1 is always in the gas phase space.

[0043] In a preferred embodiment, refer to the appendix to the specification. Figure 3 The refueling spray pressurization gas supply section 21 extends to both ends of the tank, and the branch pipeline 2 is arranged in the entire longitudinal direction of the tank to ensure that the spraying effect can be achieved during refueling.

[0044] In a preferred embodiment, refer to the appendix to the specification. Figure 5 The main pipeline 1 extends to the central cross-section of the storage tank and connects to the connecting section 22. The injection spray pressurization gas supply section 21 is symmetrically arranged on both sides of the main pipeline 1. When the main pipeline 1 extends to the central cross-section of the storage tank and connects to the connecting section 22, the connecting part 3 is placed in the center position. This ensures that the connecting part 3 is as close to the gas phase space as possible, regardless of the tilt state. It also ensures normal pressurization operation even under tilting and swaying conditions for storage tanks with high filling rates or smaller sizes. Furthermore, the symmetrical arrangement of the injection spray pressurization gas supply section 21 on both sides of the main pipeline 1 ensures that the injection spray pressurization gas supply section 21 is as close to the gas phase space as possible, enabling normal pressurization gas supply operation.

[0045] In a preferred embodiment, refer to the appendix to the specification. Figure 2 The air inlet and outlet ports 23 are evenly distributed throughout the entire filling, spraying, pressurizing, and gas supply section 21. When the storage tank tilts or shakes, as many air inlet and outlet ports 23 as possible are in the gas phase space to maintain the normal pressurizing and gas supply function of the storage tank. At the same time, the even distribution of air inlet and outlet ports throughout the entire filling, spraying, pressurizing, and gas supply section 21 also ensures that the spraying is uniform during the spraying operation.

[0046] In a preferred embodiment, the main pipeline 1 and the branch pipeline 2 are connected to each other by right-angle pipes or tee pipes, which facilitates installation and disassembly.

[0047] In a preferred embodiment, refer to the appendix to the specification. Figure 3 The main pipeline 1 extends downwards for a certain distance, and then extends upwards to the top of the storage tank into the gas phase space, forming a downward bend. The bend can buffer the gas to a certain extent, and at the same time, it can intercept the liquid carried in the gas when the pipeline is supplying gas, so as to prevent the supplied gas from carrying liquefied gas, which would rapidly expand and vaporize when heated in the external pipeline, causing pressure on the external pipeline.

[0048] In a preferred embodiment, refer to the appendix to the specification. Figure 3 A pipe clamp 24 is installed on the branch pipe 2 to fix it to the inner wall of the storage tank. The pipe clamp 24 fixes the pipeline system, which can make the pipeline system maintain a certain stability when the storage tank tilts and shakes, and will not shift or fall off, affecting the normal filling, spraying and pressurizing gas supply.

[0049] Below, we will provide several specific implementation methods for illustration.

[0050] Example 1

[0051] Reference manual attached Figure 3 Branch pipe 2 includes pipe 1 211 and pipe 2 212, while main pipe 1 includes first main pipe 12, first main pipe 13, and end cap pipe connector 11. One end of end cap pipe connector 11 is connected to the bow end cap of the storage tank, and the other end is connected to the first main pipe 12. The first main pipe 12 extends downwards for a short distance, then extends upwards to the center of the top of the storage tank, and then extends horizontally along the longitudinal direction of the storage tank to the longitudinal center cross-section. The first main pipe 13 is parallel to the center cross-section of the tank. The first main pipe 12 and the first main pipe 13 are connected by a right-angle pipe. Pipe 1 211 and pipe 2 212 are connected to the first main pipe 13 by a tee pipe. Pipe 1 211 and pipe 2 212 are located in the upper part of the liquid phase space. Pipe 1 211 extends to the bow end of the storage tank, and pipe 2 212 extends to the stern end of the storage tank. The ports are sealed by pipe plugs 25 to prevent liquid from entering from the ports. Pipeline 1 211 and Pipeline 2 212 are the injection spray pressurization air supply section 21. The pipe body is provided with air inlet and outlet holes 23 in a certain pattern, which serve as degassing holes for pressurization and air inlet holes for air supply.

[0052] This arrangement ensures that regardless of whether the tank tilts forward or backward, either pipeline 211 or pipeline 212 will always be in the gas phase, allowing for pressurized gas supply. This ensures a stable gas and oxygen supply to the tank during tilting, guaranteeing the normal operation of marine machinery.

[0053] Example 2

[0054] Reference manual attached Figure 4 Unlike Embodiment 1, branch pipeline 2 includes pipeline 3 213, pipeline 4 214, and connecting section 1 221 and connecting section 222. Connecting section 1 221 and connecting section 222 are connected to the first main pipeline 13 via tee pipes, located on both sides of the main pipeline 1, and extend outwards. Pipeline 3 213 is connected to the outer end of connecting section 1 221 via a right-angle pipe and extends along the longitudinal direction of the storage tank towards the bow end. Pipeline 4 214 is connected to the outer end of connecting section 2 222 via a right-angle pipe and extends along the longitudinal direction of the storage tank towards the stern end. Branch pipeline 2 is distributed in a "Z" shape.

[0055] When the storage tank tilts to the left or right, due to the addition of connecting section 22 and the bending design on branch pipe 2, pipe 3 213 and pipe 4 214 are located on the left and right sides of main pipe 1, respectively. Therefore, when one side tilts, one of pipe 3 213 and pipe 4 214 will always be in the gas phase space and can carry out normal pressurization and gas supply.

[0056] Example 3

[0057] Reference manual attached Figure 5 Unlike Embodiment 2, the refueling spray pressurization gas supply section 21 of branch pipeline 2 includes not only pipelines 3 213 and 4 214, but also pipelines 5 215 and 6 216. Pipelines 3 213 and 5 215 are connected to the outer ends of connecting section 1 221 via tee pipes and extend longitudinally towards the bow of the storage tank. Pipelines 4 214 and 6 216 are connected to the outer ends of connecting section 2 222 via tee pipes and extend longitudinally towards the stern of the storage tank. Pipelines 3 213, 4 214, 5 215, and 6 216 constitute the refueling spray pressurization gas supply section 21, extending to the bow and stern of the storage tank, respectively. Pipelines 3 213, 4 214, 5 215, and 6 216 form parallel double-strand lines, and branch pipeline 2 is distributed in an "H" shape.

[0058] This embodiment is a further optimization of embodiment 2. By forming parallel double-strand lines, more branch pipes 2 can perform pressurized gas supply work normally even when swaying and tilting.

[0059] Example 4

[0060] Unlike Embodiment 2, the main pipeline 1 includes a first main pipeline 12, a first main pipeline 13, and a capped pipe joint 11, as well as a third main pipeline. The connecting sections 22 of the branch pipeline 2 include connecting sections 1 and 221, as well as connecting sections 3 and 4. Based on Embodiment 2, the branch pipeline 2 is divided into two sets of "Z"-shaped branch pipelines 2 arranged vertically. The lower branch pipeline 2 is connected to the first main pipeline 13 through connecting sections 1 and 222, and the upper branch pipeline 2 is connected to the third main pipeline through connecting sections 3 and 4. The first main pipeline 13, the third main pipeline, and the first main pipeline 12 are connected by a tee pipe and are perpendicular to the first main pipeline 12.

[0061] This arrangement divides the branch pipes into two layers, which are not on the same horizontal plane, increasing the spatial arrangement layers and making the pipe system more difficult to be submerged.

[0062] Example 5

[0063] Please see Figure 6-8 The diagram illustrates the pressurization and gas supply of the pipeline system under stable, forward / backward tilt, and left / right tilt conditions, specifically showing a liquid nitrogen storage tank. When pressurization of the tank is required, nitrogen gas is input through the end cap joint 11 of the upper space pipeline system of the liquid nitrogen storage tank and released into the gas space of the storage tank through the inlet / outlet ports 23 of the injection spray pressurization gas supply section 21 for pressurization; while liquid nitrogen is output through the pressurization outlet 4 of the lower space pipeline of the liquid nitrogen storage tank, and can be converted by a vaporizer and reused for pressurization of the storage tank. Specifically, the gas stored in the upper space of the liquid nitrogen storage tank can be supplied externally through the end cap joint 11 of the pipeline system of this application.

[0064] During the process of pressurizing the LPG storage tank and supplying gas from the LPG storage tank to the outside through the pipeline system of this application, when the storage tank tilts forward or backward or left or right, the connection between the inner end of the branch pipe and the main pipe of the pipeline system is always in the gas phase space, thereby ensuring the normal pressurization and gas supply of the pipeline system.

[0065] Example 6

[0066] Please see Figure 9 The illustration shows the pipeline system of this application performing a spraying operation. Specifically, liquid nitrogen is sprayed and released into the inner cavity of the storage tank through the evenly distributed inlet and outlet holes 23 in the filling spray pressurization gas supply section pipeline, so that uniform cooling of the liquid storage tank can be achieved during the filling process.

[0067] In addition to the six specific embodiments described above, the present invention has many other variations, which will not be specifically described or limited here.

[0068] In summary, this invention provides a pipeline system for refueling and pressurizing liquefied gas storage tanks. By designing the layout of the branch pipes 2 and ensuring that the connection point 3 between the main pipe 1 and the branch pipes 2 remains within the gas phase space even during tilting and swaying, the system guarantees normal pressurization and gas supply during the tank's movement with the ship. This provides the tank with an anti-tilting effect, ensuring the normal operation of the supplied mechanical equipment. The system enables the tank to adapt to scenarios prone to tilting and swaying, such as ships, preventing the mechanical equipment on board from becoming unusable when tilting.

[0069] It should be noted that the above embodiments can be freely combined as needed. The above are merely preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A pipeline system for injecting and pressurizing liquefied gas into a storage tank, characterized in that, include: The pipeline body is located inside the storage tank and includes a main pipeline extending from the tank head along the tank axis and branch pipelines extending from the main pipeline to both sides. The outer end of the branch pipeline extends along the tank axis to form a filling spray pressurization gas supply section. The filling spray pressurization gas supply section has multiple air inlet and outlet holes. The connection between the inner end of the branch pipeline and the main pipeline is always in the gas phase space, and one of the branch pipelines is always in the gas phase space. The branch pipeline also includes a connecting section for connecting the injection spray pressurization gas supply section to the main pipeline. The injection spray pressurization gas supply section is formed by extending the outer end of the connecting section in the opposite direction along the axial direction of the storage tank; or the injection spray pressurization gas supply section is formed by extending the outer end of the connecting section along the axial direction of the storage tank to both ends and the injection spray pressurization gas supply section is symmetrically arranged on both sides of the main pipeline. The main pipeline extends to the central cross-section of the storage tank and connects to the connecting section.

2. The pipeline system for injecting and pressurizing liquefied gas into a storage tank according to claim 1, characterized in that, The branch pipelines are multiple sets arranged vertically inside the storage tank.

3. The pipeline system for injecting and pressurizing liquefied gas into a storage tank according to claim 1, characterized in that, The port of the injection spray pressurization gas supply section is closed.

4. The pipeline system for injecting and pressurizing liquefied gas into a storage tank according to any one of claims 1-3, characterized in that, The refueling spray pressurization gas supply section extends to both ends of the storage tank.

5. The pipeline system for injecting and pressurizing liquefied gas into a storage tank according to any one of claims 1-3, characterized in that, The air inlet and outlet holes are evenly distributed throughout the entire injection spray pressurization air supply section.

6. The pipeline system for injecting and pressurizing liquefied gas into a storage tank according to any one of claims 1-3, characterized in that, The main pipeline and the branch pipelines are connected to each other by right-angle pipes or T-junctions.

7. The pipeline system for injecting and pressurizing liquefied gas into a storage tank according to any one of claims 1-3, characterized in that, The main pipeline first extends downwards for a certain distance, and then extends upwards to the gas phase space at the top of the storage tank.

8. The pipeline system for spray-pressurized gas supply for liquefied gas storage tanks according to any one of claims 1-3, characterized in that, The branch pipe is equipped with a pipe clamp for fixing to the inner wall of the storage tank.

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