B-type cabin tank body mechanism convenient for removing gas in annular space

Abstract

The utility model provides a B-type cabin tank body mechanism convenient for removing gas in an annular space, which comprises a fastening assembly, a plurality of welding studs welded on the surface of a tank body, connecting nuts for connecting the welding studs with screw rods, a flange plate sleeved on the plurality of screw rods along the vertical direction and positioned at the lower end of the connecting nuts, and spring washers sleeved on the screw rods and positioned at the lower end of the flange plate, the nut is sleeved on the screw rod and is positioned at the lower end of the spring washer; and the pipeline is welded with the flange plates. According to the connection mode between the nitrogen purging pipe and the tank body, the structural stress of the tank body is not affected, installation is easy, and meanwhile maintenance is convenient.

Description

Technical Field

[0001] The invention relates to the technical field of thermal insulation materials for ship fuel tanks, and in particular to a B-type tank body structure which is convenient for removing gas in an annular space. Background Art

[0002] At present, the shell protection materials of the fuel tanks and cryogenic tanks of existing LNG ships are easily damaged due to stress concentration caused by low-temperature shrinkage and expansion. At the same time, since part of the tank is exposed on the main deck of the ship, it is easily corroded by seawater, exposed to sunlight, and external impact, which also causes damage to the shell protection materials. The above phenomenon increases the maintenance costs of shipyards and suppliers.

[0003] The cryogenic storage tanks of Type B cabins on the market generally transport flammable gases such as liquefied natural gas, liquids, etc. These gases and liquids are mainly used as fuels. Before loading the tank, all pipelines and the annular space between the tank and the insulation need to be purged, mainly to remove air from the pipelines and avoid mixing air in the flammable gas to form an explosive mixture and generate a report when encountering a dangerous source. Purging after loading is to purge the remaining flammable gas in the pipeline back to the storage tank, and also to avoid wasting fuel.

[0004] Nitrogen is chosen because it is an inert gas that neither burns nor supports combustion; for example, LNG already contains nitrogen, which will not cause changes in the gas composition and will not affect the quality of LNG.

[0005] Due to the special features of the B-type tank, there is an annular space, and this entire space also needs to be purged with nitrogen, so the connection between the nitrogen purge pipeline and the tank body is particularly important, and ordinary welding cannot be used. The nitrogen pipeline here must not only be reasonably connected to the tank body, but also be properly insulated so as not to affect the insulation system of the entire tank body. Summary of the invention

[0006] In view of the deficiencies in the prior art, the present invention provides a B-type tank structure that is convenient for clearing the gas in the annular space, and a connection method between the nitrogen purge pipe and the tank body, which does not affect the tank structure and stress, is simple to install, and is easy to maintain.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] A B-type tank structure that is convenient for clearing gas from an annular space, comprises a pipeline, wherein the pipeline is fixed to the tank body by a fastening assembly, wherein the fastening assembly comprises a welding nail, a connecting nut, a screw, a first flange and a fastening nut, wherein one end of the pipeline is fastened by the first flange, the screw passes through the first flange, one end of the screw is fastened to the first flange by the connecting nut, and the other end is fastened to the first flange by the fastening nut; the welding nail is welded to the surface of the tank body, and the connecting nut also connects and fixes the welding nail and the screw.

[0009] Furthermore, a prefabricated insulation board is provided on one side of the tank body, a gasket is provided between the prefabricated insulation board and the tank body, and the tank body, the prefabricated insulation board and the gasket together form an annular space a.

[0010] Furthermore, the fastening assembly is located in the annular space a, the pipeline passes through the prefabricated insulation board, and sealing glue is provided between the outer wall of the pipeline and the prefabricated insulation board.

[0011] Furthermore, a special gasket is provided between the first flange and the connecting nut.

[0012] Furthermore, a spring washer is provided between the first flange and the fastening nut.

[0013] Preferably, the prefabricated insulation board is rigid polystyrene foam plastic.

[0014] Preferably, the special gasket is Teflon.

[0015] Preferably, the gasket is made of elastic thermal insulation material.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] (1) Excellent thermal insulation performance: connecting the pipe and the insulation board together does not affect the overall thermal insulation effect

[0018] (2) Wide range of applications: It can be applied to cryogenic storage tanks of various shapes and different liquefied gases, especially those with complex shapes.

[0019] (3) Easy and convenient installation: After simple training, ordinary workers can understand the operation steps.

[0020] (4) Long service life and firm fixation: The nitrogen purge system is firmly fixed to the tank body by mechanical connection, rather than just fixed to the prefabricated insulation board, which increases the fixing strength, divides the stress of thermal expansion and contraction of the prefabricated insulation board, prevents the insulation system from cracking due to stress concentration, and further strengthens the strength of the insulation board system. At the same time, it reduces the damage to the prefabricated insulation board caused by the vibration of the liquid tank during operation.

[0021] (5) Excellent installation environment: In the face of increasingly stringent environmental protection requirements, polyurethane insulation is not used, which reduces pollution to the site.

[0022] (6) Easy maintenance: During maintenance, only the prefabricated insulation boards related to the maintenance are involved. After the maintenance is completed, only the prefabricated insulation boards here need to be replaced. There is no impact on other insulation boards around, and there is no defect in the insulation system after the maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is the fixing diagram of the inert gas pipeline and the tank surface of the B-type tank;

[0024] Figure 2 is a schematic diagram of the structure of the fastening assembly;

[0025] In the figure: 1. Tank; 2. Gasket; 3. Prefabricated insulation board; 4. Welding nails; 5. Connecting nut; 6. Screw; 7. Special gasket; 8. First flange; 9. Spring washer; 10. Fastening nut; 11. Pipe; 12. Glue; 13. Second flange DETAILED DESCRIPTION

[0026] The specific implementation of the present invention will be described in more detail below in conjunction with the schematic diagram. The advantages and features of the present invention will become clearer based on the following description and the scope of the claims. It should be noted that the drawings are all in a very simplified form and are not in exact proportions, and are only used to facilitate and clearly assist in explaining the purpose of the embodiments of the present invention.

[0027] like Figure 1 The B-type tank structure shown here is convenient for removing the gas in the annular space. A prefabricated insulation board 3 is provided on one side of the tank body 1. A gasket 2 is provided between the prefabricated insulation board 3 and the tank body 1. The tank body, the prefabricated insulation board 3 and the gasket 2 together form an annular space a. The fastening assembly is located in the annular space a. The pipe 11 passes through the prefabricated insulation board 3. A sealing glue 12 is provided between the outer wall of the pipe 11 and the prefabricated insulation board 3.

[0028] One end of the pipe 11 is fixed to the tank body 1 through a fastening assembly, which includes a welding nail 4, a connecting nut 5, a screw 6, a first flange 8 and a fastening nut 10. The upper end of the pipe 11 is fastened by the first flange 8, and the screw 6 passes through the first flange 8 from top to bottom. The upper end of the screw 6 is fastened to the first flange 8 through the connecting nut 5, and the lower end is fastened to the first flange 8 through the fastening nut 10. There are two first flanges 8.

[0029] The welding nail 4 is welded to the surface of the tank body 1, and the connecting nut 5 also connects and fixes the welding nail 4 to the screw 6. The two first flanges 8 are sequentially sleeved on the screw 6 in the vertical direction, and a special gasket 7 made of special material is added between the first flange 8 and the connecting nut 5. The special gasket 7 is Teflon. The spring washer 9 is sleeved on the screw 6 and located at the lower end of the first flange 8. The fastening nut 10 is sleeved on the screw 6 and located at the lower end of the spring washer 9, which can not only reduce electrical corrosion, but also reduce heat exchange, and achieve a better local insulation effect. The lower end of the pipe 11 is also connected to the second flange 13. The pipe 11 and the first flange 8 and the second flange 13 are pre-welded together. After the nitrogen purge pipe is installed, the surrounding prefabricated insulation board 3 is installed. A gasket 2 is placed between the prefabricated insulation board 3 and the liquid tank to ensure a gap therebetween. Low-temperature glue 12 is applied between the prefabricated insulation board 3 and the pipe 11 to seal and better connect the prefabricated insulation board 3 and the pipe 11 together.

[0030] Through the detailed description of the preferred embodiments above, it is hoped that the features and spirit of the present invention can be more clearly described, and the scope of the present invention is not limited by the preferred embodiments disclosed above. On the contrary, its purpose is to cover various changes and arrangements with equivalents within the scope of the claims to be applied for by the present invention.

Claims

1. A B-type tank structure for facilitating the removal of annular space gas, characterized in that: The invention comprises a pipeline (11), wherein the pipeline is fixed to a tank body (1) via a fastening assembly, wherein the fastening assembly comprises a welding nail (4), a connecting nut (5), a screw rod (6), a first flange (8) and a fastening nut (10), wherein one end of the pipeline is fastened via the first flange (8), the screw rod passes through the first flange, one end of the screw rod is fastened to the first flange via the connecting nut, and the other end of the screw rod is fastened to the first flange via the fastening nut; the welding nail (4) is welded to the surface of the tank body, and the connecting nut (5) further connects and fixes the welding nail to the screw rod. A prefabricated insulation board (3) is provided on one side of the tank body, a gasket (2) is provided between the prefabricated insulation board (3) and the tank body (1), the tank body, the prefabricated insulation board and the gasket together form an annular space a, the fastening assembly is located in the annular space a, the pipeline passes through the prefabricated insulation board, and sealing glue (12) is provided between the outer wall of the pipeline (11) and the prefabricated insulation board (3).

2. A B-type tank structure for facilitating the removal of annular space gas according to claim 1, characterized in that: A special gasket (7) is provided between the first flange (8) and the connecting nut (5).

3. A B-type tank structure for facilitating the removal of annular space gas according to claim 1, characterized in that: A spring washer (9) is provided between the first flange and the fastening nut.

4. A B-type tank structure for facilitating the removal of annular space gas according to claim 2, characterized in that: The prefabricated insulation board (3) is made of rigid polystyrene foam plastic.

5. A B-type tank structure for facilitating the removal of annular space gas according to claim 4, characterized in that: The special gasket (7) is Teflon.

6. A B-type tank structure for facilitating the removal of annular space gas according to claim 2, characterized in that: The gasket (2) is made of elastic thermal insulation material.

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