A heat insulation through-tank structure of LNG liquid phase pipe and LNG gas-powered ship

Abstract

The present invention discloses a heat-insulating through-tank structure of an LNG liquid phase pipe and an LNG gas-powered ship, comprising a main structure and a through-tank box body, an opening is provided on the main structure, the diameter of the opening is slightly larger than the outer diameter D of the LNG liquid phase pipe, so that when the LNG liquid phase pipe passes through the main structure through the opening, there is a gap between the peripheral wall of the LNG liquid phase pipe and the main structure without direct contact, the through-tank box body comprises a side plate and an end cover connected to the top of the side plate, the bottom of the side plate is fixedly connected to the main structure, a perforation matching the outer diameter of the LNG liquid phase pipe is provided on the end cover so that the LNG liquid phase pipe can pass through the through-tank box body in a sealed manner through the perforation, and the peripheral wall of the LNG liquid phase pipe is coated with a heat-insulating layer. The present invention can effectively improve the low temperature conduction of the LNG liquid phase pipe to the main structure through the through-tank box body, and the main structure can be damaged by low temperature, and the through-tank box body can not only fix the LNG liquid phase pipe, but also form a watertight effect.

Description

Technical Field

[0001] The invention relates to the technical field of LNG liquid phase pipe installation structures, and in particular to a heat insulation through-chamber structure of an LNG liquid phase pipe and an LNG gas-powered ship. Background Art

[0002] During the laying process of LNG (Liquefied Natural Gas) pipelines, it is often inevitable to encounter situations where it is necessary to penetrate fireproof structures or watertight structures. However, since the medium temperature in the pipeline is extremely low, which can reach -163°C, when ordinary through-hole parts are used to penetrate fireproof structures or watertight structures, the low temperature can easily be transmitted to the fireproof structures or watertight structures, thereby causing low-temperature damage to the fireproof structures or watertight structures. In severe cases, it may even cause the structure to crack due to low temperature. Summary of the invention

[0003] In view of the deficiencies in the prior art, the present invention provides an insulated through-chamber structure for an LNG liquid phase pipe, which mainly solves the technical problem that the through-chamber components in the prior art easily transmit the low temperature of the LNG pipe to the fireproof structure or watertight structure penetrated by the LNG pipe, thereby causing low-temperature damage thereto.

[0004] To achieve the above object, the present invention is achieved through the following technical solutions:

[0005] A heat-insulating through-tank structure for an LNG liquid phase pipe comprises a main structure and a through-tank box body, wherein an opening is provided on the main structure, and the diameter of the opening is slightly larger than the outer diameter D of the LNG liquid phase pipe, so that when the LNG liquid phase pipe passes through the main structure through the opening, a gap is left between the peripheral wall of the LNG liquid phase pipe and the main structure without direct contact, the through-tank box body comprises a side plate and an end cover connected to the top of the side plate, the bottom of the side plate is fixedly connected to the main structure, a through hole matching the outer diameter of the LNG liquid phase pipe is provided on the end cover so that the LNG liquid phase pipe can pass through the through-tank box body in a sealed manner through the through hole, and the peripheral wall of the LNG liquid phase pipe is coated with a heat-insulating layer.

[0006] Furthermore, the shortest distance from the peripheral wall of the LNG liquid phase pipe to the connection between the end cover and the side plate is defined as L1, the shortest distance from the connection between the end cover and the side plate to the main structure is defined as L2, and the ratio of the total length of L1+L2 to the outer diameter D of the LNG liquid phase pipe is in the range of 3 to 5.

[0007] Furthermore, the ratio of the total length of L1+L2 to the outer diameter D of the LNG liquid phase pipe is 4.

[0008] Furthermore, the mating parts of the LNG liquid phase pipe and the perforations on the end cover are sealed and fixed by welding.

[0009] Furthermore, the heat insulation layer is a hard polyurethane foam coated on the peripheral wall of the LNG liquid phase pipe.

[0010] Furthermore, the through-chamber box body is made of stainless steel.

[0011] Furthermore, the wall thickness of the side panels and end covers of the through-chamber box body is greater than 3 mm.

[0012] Furthermore, the heat-insulating through-chamber structure of the LNG liquid phase pipe also includes an annular bottom plate, the outer side of the annular bottom plate is fixedly connected to the main structure, the inner side of the annular bottom plate abuts against the heat-insulating layer, the annular bottom plate and the through-chamber box body cooperate with each other to form a closed chamber, and an injection port is provided on the side plate of the through-chamber box body, and a sealing cover is connected to the injection port, and soft polyurethane foam can be injected into the closed chamber through the injection port to improve the heat-insulating effect.

[0013] Furthermore, the annular bottom plate is made of stainless steel.

[0014] Based on the same inventive concept, the present invention also provides an LNG gas-powered ship, comprising any of the above-mentioned heat-insulating through-chamber structures for LNG liquid phase pipes, wherein the main structure is a watertight deck of the ship.

[0015] The above technical solution has the following advantages or beneficial effects:

[0016] In the heat-insulating through-tank structure of the LNG liquid phase pipe described in the present invention, since the opening diameter on the main structure is slightly larger than the outer diameter D of the LNG liquid phase pipe, when the LNG liquid phase pipe passes through the main structure through the opening, the peripheral wall of the LNG liquid phase pipe is not in direct contact with the main structure. At the same time, the peripheral wall of the LNG liquid phase pipe is covered with a heat-insulating layer. Therefore, the LNG liquid phase pipe cannot be directly transmitted to the main structure. Although the LNG liquid phase pipe and the main structure are connected to the through-tank box body, the low temperature on the LNG liquid phase pipe needs to be transmitted through the end cover and the side plate of the through-tank box body in sequence during the conduction process. During this conduction process, the low temperature will gradually be consumed and it is difficult to be transmitted to the main structure, which greatly reduces the degree to which the main structure is affected by the low temperature and effectively ensures the safety and stability of the main structure. In addition, a through hole is provided on the end cover of the through-tank box body for the LNG liquid-phase pipe to pass through in a sealed manner. The end cover and the LNG liquid-phase pipe are tightly fitted together, and the bottom of the side plate of the through-tank box body is fixedly connected to the main structure. Therefore, the through-tank box body can not only fix the LNG liquid-phase pipe, but also form a watertight effect, thereby ensuring the installation stability of the LNG liquid-phase pipe and the waterproof sealing of the main structure installation position. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic structural diagram of an embodiment of the present invention.

[0018] Description of labels:

[0019] 1. Main structure, 2. Through-chamber box, 3. LNG liquid phase pipe, 4. Thermal insulation layer, 5. Annular bottom plate, 6. Soft polyurethane foam, 21. Side plate, 22. End cover, 211. Injection port. DETAILED DESCRIPTION

[0020] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0021] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention 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 understood as a limitation on the present invention.

[0022] Please refer to the attached Figure 1An embodiment of the present invention provides an insulated through-tank structure for an LNG liquid phase pipe, comprising a main structure 1 and a through-tank box body 2, wherein an opening is provided on the main structure 1, and the diameter of the opening is slightly larger than the outer diameter D of the LNG liquid phase pipe 3, so that when the LNG liquid phase pipe 3 passes through the main structure 1 through the opening, a gap is left between the peripheral wall of the LNG liquid phase pipe 3 and the main structure 1 without direct contact, the through-tank box body 2 comprises a side plate 21 and an end cover 22 connected to the top of the side plate 21, the bottom of the side plate 21 is fixedly connected to the main structure 1, a through hole matching the outer diameter of the LNG liquid phase pipe 3 is provided on the end cover 22 so that the LNG liquid phase pipe 3 can pass through the through-tank box body 2 in a sealed manner through the through hole, and the peripheral wall of the LNG liquid phase pipe 3 is coated with a heat insulation layer 4. It can be understood that in this embodiment, since the opening diameter on the main structure 1 is slightly larger than the outer diameter D of the LNG liquid phase pipe 3, when the LNG liquid phase pipe 3 passes through the main structure 1 through the opening, the peripheral wall of the LNG liquid phase pipe 3 is not in direct contact with the main structure 1. At the same time, the peripheral wall of the LNG liquid phase pipe 3 is covered with a heat insulation layer 4. Therefore, the LNG liquid phase pipe 3 cannot be directly transmitted to the main structure 1. Although the LNG liquid phase pipe 3 and the main structure 1 are connected to the through-tank box body 2, the low temperature on the LNG liquid phase pipe 3 needs to be transmitted through the end cover 22 and the side plate 21 of the through-tank box body 2 in the conduction process. During this conduction process, the low temperature will gradually be consumed and it is difficult to be transmitted to the main structure, which greatly reduces the degree to which the main structure 1 is affected by the low temperature and effectively ensures the safety and stability of the main structure 1. In addition, a through hole is provided on the end cover 22 of the through-tank box body 2 for the LNG liquid-phase pipe 3 to pass through in a sealed manner. The end cover 22 and the LNG liquid-phase pipe 3 are tightly fitted together, and the bottom of the side panel 21 of the through-tank box body 2 is fixedly connected to the main structure 1. Therefore, the through-tank box body 2 can not only fix the LNG liquid-phase pipe 3, but also form a watertight effect, thereby ensuring the installation stability of the LNG liquid-phase pipe 3 and the waterproof sealing of the installation position of the main structure 1.

[0023] Please refer to the attached Figure 1In one preferred embodiment, the shortest distance from the peripheral wall of the LNG liquid phase pipe 3 to the connection between the end cover 22 and the side plate 21 is defined as L1, the shortest distance from the connection between the end cover 22 and the side plate 21 to the main structure 1 is defined as L2, and the ratio of the total length of L1+L2 to the outer diameter D of the LNG liquid phase pipe 3 is in the range of 3 to 5. Preferably, in this embodiment, the ratio of the total length of L1+L2 to the outer diameter D of the LNG liquid phase pipe 3 is 4. In this embodiment, the ratio of the total length of L1+L2 to the outer diameter D of the LNG liquid phase pipe 3 is configured to be 4, which can well make the total length of L1+L2 greater than the frost radiation distance of the through-tank box body 2, and effectively prevent the low temperature from being transmitted to the main structure 1 through the through-tank box body 2 and causing damage to the main structure 1. However, those skilled in the art should understand that in other embodiments, the ratio of L1+L2 to D may also be other values, such as 6 or 7 or even larger. The larger the ratio, the less likely it is that the low temperature will be transmitted to the main structure 1 through the through-chamber box body 2. As long as the low temperature can be prevented from being transmitted to the main structure 1 through the end cover 22 and the side panel 21 to cause the main structure 1 to be damaged by the low temperature, it is not limited to the specific implementation manner disclosed in this embodiment, and those skilled in the art can design it according to specific needs.

[0024] Please refer to the attached Figure 1 In one preferred embodiment, the LNG liquid phase pipe 3 and the end cap 22 are sealed and fixed at the fitting position by welding. In this embodiment, the LNG liquid phase pipe 3 and the end cap 22 can well ensure the connection stability between the LNG liquid phase pipe 3 and the end cap 22 by fitting the end of the perforation on the end cap 22, and can also improve the waterproof sealing of the connection.

[0025] Please refer to the attached Figure 1 In one preferred embodiment, the heat insulation layer 4 is a hard polyurethane foam coated on the peripheral wall of the LNG liquid phase pipe 3.

[0026] Please refer to the attached Figure 1In one preferred embodiment, the through-tank box body 2 is made of stainless steel. Since the LNG liquid phase pipe 3 is usually made of stainless steel, and in this embodiment, the through-tank box body 2 is also made of stainless steel, the materials of the two are the same. Therefore, during the assembly process, the through-tank box body 2 and the LNG liquid phase pipe 3 can be well combined together by welding, and the through-tank box body 2 made of stainless steel is not only resistant to low temperature and corrosion, but also has good fire resistance, which greatly improves its safety factor in use. However, those skilled in the art should understand that in other implementations, the through-tank box body 2 is not limited to the stainless steel material disclosed in this embodiment, and can also be made of other low-temperature and corrosion-resistant metal materials in the prior art that have the same or similar properties as stainless steel materials, such as carbon steel. As long as it can ensure that the through-tank box body 2 is strong enough to stabilize the LNG liquid phase pipe 3 and has good low-temperature and corrosion resistance, those skilled in the art can make specific choices according to specific needs.

[0027] Please refer to the attached Figure 1 In one preferred embodiment, the wall thickness of the side panels 21 and the end cover 22 of the through-tank box body 2 is greater than 3 mm. In this embodiment, the overall strength and fireproof performance of the through-tank box body 2 can be well improved by setting the wall thickness of the side panels 21 and the end cover 22 to be greater than 3 mm.

[0028] Please refer to the attached Figure 1 In one preferred embodiment, the heat-insulating through-chamber structure of the LNG liquid phase pipe also includes an annular bottom plate 5, the outer side of the annular bottom plate 5 is fixedly connected to the main structure 1, the inner side of the annular bottom plate 5 abuts against the heat-insulating layer 4, the annular bottom plate 5 and the through-chamber box body 2 cooperate with each other to form a closed chamber, and an injection port 211 is provided on the side plate 21 of the through-chamber box body 2, and a sealing cover is connected to the injection port 211, and soft polyurethane foam 6 can be injected into the closed chamber through the injection port 211 to improve the heat-insulating effect.

[0029] Please refer to the attached Figure 1 In one preferred embodiment, the annular bottom plate 5 is made of stainless steel.

[0030] Please refer to the attached Figure 1 An embodiment of the present invention further provides an LNG gas-powered ship, comprising the heat-insulating through-chamber structure of the LNG liquid phase pipe of any of the above embodiments, wherein the main structure 1 is a watertight deck of the ship.

[0031] As described above, the embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some of the technical features therein by equivalents. These modifications or replacements do not deviate the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention. Therefore, all other embodiments obtained by those skilled in the art without making creative efforts belong to the protection scope of the present invention.

Claims

1. A heat insulation through-tank structure for LNG liquid phase pipes, Features: The invention comprises a main structure (1) and a through-tank box body (2), wherein an opening is provided on the main structure (1), and the diameter of the opening is slightly larger than the outer diameter D of the LNG liquid phase pipe (3), so that when the LNG liquid phase pipe (3) passes through the opening and out of the main structure (1), a gap is left between the peripheral wall of the LNG liquid phase pipe (3) and the main structure (1) and they do not directly contact each other, the through-tank box body (2) comprises a side plate (21) and an end cover (22) connected to the top of the side plate (21), the bottom of the side plate (21) is fixedly connected to the main structure (1), the end cover (22) is provided with a through hole matching the outer diameter of the LNG liquid phase pipe (3) so that the LNG liquid phase pipe (3) can pass through the through hole in a sealed manner and out of the through-tank box body (2), and the peripheral wall of the LNG liquid phase pipe (3) is coated with a heat insulation layer (4); The shortest distance from the peripheral wall of the LNG liquid phase pipe (3) to the connection between the end cover (22) and the side plate (21) is defined as L1, the shortest distance from the connection between the end cover (22) and the side plate (21) to the main structure (1) is defined as L2, and the ratio of the total length of L1+L2 to the outer diameter D of the LNG liquid phase pipe (3) is in the range of 3 to 5; The mating portion between the LNG liquid phase pipe (3) and the perforation on the end cover (22) is sealed and fixed by welding; The heat-insulating through-tank structure of the LNG liquid phase pipe further comprises an annular bottom plate (5), the outer side of the annular bottom plate (5) is fixedly connected to the main structure (1), the inner side of the annular bottom plate (5) abuts against the heat-insulating layer (4), the annular bottom plate (5) and the through-tank box body (2) cooperate with each other to form a closed chamber, and an injection port (211) is provided on the side plate (21) of the through-tank box body (2), a sealing cover is connected to the injection port (211), and soft polyurethane foam (6) can be injected into the closed chamber through the injection port (211) to improve the heat-insulating effect.

2. The heat insulation through-chamber structure of the LNG liquid phase pipe according to claim 1, Features: The ratio of the total length of L1+L2 to the outer diameter D of the LNG liquid phase pipe (3) is 4.

3. The heat insulation through-chamber structure of the LNG liquid phase pipe according to claim 1, Features: The heat insulation layer (4) is a hard polyurethane foam coated on the peripheral wall of the LNG liquid phase pipe (3).

4. The heat insulation through-tank structure of the LNG liquid phase pipe according to any one of claims 1 to 3, Features: The through-chamber box body (2) is made of stainless steel.

5. The heat insulation through-chamber structure of the LNG liquid phase pipe according to claim 4, Features: The wall thickness of the side plate (21) and the end cover (22) of the through-chamber box body (2) is greater than 3 mm.

6. The heat insulation through-chamber structure of the LNG liquid phase pipe according to claim 1, Features: The annular bottom plate (5) is made of stainless steel.

7. An LNG gas-powered ship, Features: A heat-insulating tank structure comprising an LNG liquid phase pipe as claimed in any one of claims 1 to 6, wherein the main structure (1) is a watertight deck of a ship.

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