Anti-corrosion structure of LNG storage tank

Abstract

The application relates to the technical field of storage tanks, in particular to a LNG storage tank anticorrosion structure. The application comprises an outer tank, the outer tank is fixed through a saddle support arranged at the bottom, a plurality of inner tanks are arranged in the outer tank, the plurality of inner tanks are independently and closedly arranged in the outer tank, the plurality of inner tanks are linearly arranged in the outer tank, each inner tank is provided with a pipeline group connected with the outside, the inner tank is fixed in the outer tank through annular supports arranged at both sides in the linear direction, a sandwich structure is arranged on one side of the inner tank between two adjacent inner tanks, and the sandwich structure is arranged at a position corresponding to the saddle support at the lower side of the outer tank.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of storage tanks, in particular to a LNG storage tank anticorrosion structure. BACKGROUND

[0002] Under the situation of the world energy is increasingly nervous, the proportion of natural gas in the world energy structure will gradually catch up with oil, become the world's first big energy, therefore, many countries in the world attach great importance to the design and manufacture of large atmospheric LNG storage tank, so far our country has no large liquefied natural gas storage tank national standard, therefore, to strengthen the research of liquefied natural gas storage tank is of great significance to promote the development of China's liquefied natural gas industry, solve the increasingly deteriorating environmental problems and energy crisis, the existing LNG storage tank still has some deficiencies to be improved in use.

[0003] The existing LNG storage tank in use, due to the distance from the inner tank support structure end to the inner tank farthest end is too large, so that the large independent inner tank in use, actually occurred invisible bending deformation, plus in the LNG storage tank in use, the weight and low temperature environment, make the bending deformation position originally anticorrosion coating more easily fall off, make the inner tank more easily corroded and gravity deformation, further affect the safe use of the inner tank.

[0004] In addition, the larger inner tank in use, the process of injecting liquefied natural gas is relatively slow, so that in the process of injection, temperature, gravity and pressure in the inner tank, the imbalance problem, more easily make the inner tank occur strain, the anticorrosion coating of inner wall and the outer anticorrosion coating are prone to fall off and peel off, affect the safe use. SUMMARY

[0005] The technical problem to be solved by the present application is to provide a LNG storage tank anticorrosion structure, which solves the above technical problems. The LNG storage tank anticorrosion structure comprises an outer tank and a plurality of inner tanks arranged in the outer tank in a linear arrangement.

[0006] In order to solve the above technical problems, the technical scheme adopted by the present application is: comprising an outer tank; the outer tank is fixed through the saddle support arranged at the bottom; a plurality of inner tanks are arranged in the outer tank; the plurality of inner tanks are independently closed and arranged in the outer tank; the plurality of inner tanks are linearly arranged in the outer tank; each inner tank is provided with a pipeline group connected with the outside; the inner tank is fixed in the outer tank through the annular support arranged on both sides in the linear direction; the inner tank on one side between two adjacent inner tanks is provided with a sandwich structure; the sandwich structure is arranged at the corresponding position of the saddle support on the lower side of the outer tank.

[0007] Further optimization of the technical scheme, the inner tank is provided with a sandwich cavity on one side close to other inner tanks; the sandwich cavity is provided with the same size as the cross section of the inner tank; the outer side of the sandwich cavity is provided with the same annular support as the inner tank and is fixedly connected with the inner wall of the outer tank.

[0008] Further optimization of the technical scheme, the annular support between two adjacent inner tanks and the annular support on the outer wall of the sandwich cavity are correspondingly arranged with the width of the saddle support on the lower side of the outer tank.

[0009] Further optimization of the technical scheme, the pipeline group comprises an upper connecting pipe in communication with the inner tank; and a group of two lower connecting pipes in communication with the inner tank; the two lower connecting pipes are connected after extending out of the outer tank.

[0010] Further optimization of the technical scheme, each inner tank is provided with a corresponding pressure gauge outside the outer tank.

[0011] Further optimization of the technical scheme, the annular support is circumferentially equidistantly provided with a lightening strip hole.

[0012] Further optimization of the technical scheme, the upper side of the saddle support is an arc-shaped support body corresponding to the outer wall of the outer tank; a base plate is connected to one side of the arc-shaped support body and is arranged downward; and a plurality of longitudinal support plates are arranged in parallel and vertically from the base plate.

[0013] Compared with the prior art, the present application has the following advantages: 1, a plurality of linearly arranged inner tanks are arranged in the outer tank, and the support between the inner tank and the outer tank is realized through the sandwich mechanism between the inner tank and the outer tank, which is beneficial to ensure that the inner tank is correspondingly supported by the saddle support outside the outer tank, realizes the outward conduction of the support of the inner tank, forms effective support of the inner tank and the outer tank and the outer tank, realizes the reduction of the volume of the inner tank, reduces the invisible deformation of the inner tank during use, avoids the problem of accelerated corrosion due to the surface coating falling off caused by deformation; 2, a plurality of linearly arranged inner tanks, which are beneficial to ensure that a plurality of inner tanks are simultaneously injected or sent out during the injection and sending process, reduce the process time of injection and sending, make the inner tank be in a stable state of being empty or full for a long time, and avoid the influence on the structural stability of the inner tank during the change process. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 Figure 1 is a schematic diagram of the overall external structure of the LNG storage tank anticorrosion structure.

[0015] Figure 2 Figure 2 is a schematic diagram of the partial cross-sectional structure of the LNG storage tank anticorrosion structure.

[0016] Figure 3 Figure 3 is a schematic diagram of the multiple inner tank structures of the LNG storage tank anticorrosion structure.

[0017] Figure 4 Figure 4 is a schematic diagram of the single inner tank cross-sectional structure of the LNG storage tank anticorrosion structure.

[0018] In the figure: 1, outer tank; 2, saddle support; 3, inner tank; 4, annular support; 5, interlayer cavity; 6, upper connecting pipe; 7, lower connecting pipe; 8, pressure gauge; 9, lightening bar hole; 10, arc-shaped support body; 11, base plate; 12, longitudinal support plate. DETAILED DESCRIPTION

[0019] In order to make the objectives, technical solutions and advantages of the present application clearer and more comprehensible, the present application will be further described in detail below with reference to specific embodiments and the accompanying drawings. It should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present application. In addition, in the following description, the description of well-known structures and techniques is omitted to avoid unnecessary confusion of the concept of the present application.

[0020] DETAILED DESCRIPTION: COMBINATION Figures 1-4As shown, including the outer tank 1; the outer tank 1 is fixed by setting the saddle support 2 in the bottom; the outer tank 1 is provided with a plurality of inner tanks 3; a plurality of inner tanks 3 are independently enclosed in the outer tank 1; a plurality of inner tanks 3 are arranged in linear arrangement in the outer tank 1; each inner tank 3 is provided with a pipeline group connected with the outside; the inner tank 3 is fixed in the outer tank 1 by the annular support 4 arranged on both sides in the linear direction; the inner tank 3 is provided with a sandwich structure on one side between two adjacent inner tanks 3; the sandwich structure is provided with a corresponding position of the saddle support 2 on the lower side of the outer wall; the inner tank 3 is provided with a sandwich cavity 5 on the side close to the other inner tank 3; the sandwich cavity 5 is provided with the same size as the cross section of the inner tank 3; the outer side of the sandwich cavity 5 is provided with the same annular support 4 as the inner tank 3 and is fixedly connected with the inner wall of the outer tank 1; the annular support 4 between two adjacent inner tanks 3 and the annular support 4 of the outer wall of the sandwich cavity 5 are provided with a corresponding width of the saddle support 2 on the lower side of the outer tank 1; the pipeline group comprises an upper connecting pipe 6 communicated with the inner tank 3; and a group of two lower connecting pipes 7 communicated with the inner tank 3; two lower connecting pipes 7 are connected with a surrounding one after extending out of the outer tank 1; each inner tank 3 extending to the outside of the outer tank 1 is provided with a corresponding pressure gauge 8; the annular support 4 is provided with a weight reduction strip hole 9 at equal intervals in the circumferential direction; the upper side of the saddle support 2 is an arc-shaped support body 10 corresponding to the outer wall of the outer tank 1; a base plate 11 is connected to the arc-shaped support body 10 on one side and arranged downward; and a plurality of longitudinal support plates 12 are arranged in parallel and vertically from the base plate 11.

[0021] In use, in combination Figures 1-4 As shown, when injecting and discharging liquefied natural gas, the liquefied natural gas in a plurality of inner tanks 3 is discharged or injected simultaneously through the pipeline group, thereby shortening the process of dynamic change of the pressure and weight of the inner tank 3, and avoiding the problem that the inner tank 3 is easily deformed during the dynamic process due to the injection or discharge time process, thereby affecting the anticorrosion performance of the inner tank 3.

[0022] In combination Figures 1-4 As shown, when the inner tank 3 is full of liquefied natural gas, the annular support 4 of the two adjacent inner tanks 3 and the annular support 4 of the outer wall of the sandwich cavity 5 are matched, thereby realizing the stable support between the inner tank 3 and the inner wall of the outer tank 1; the support structure is arranged corresponding to the arc-shaped support body 10 of the saddle support 2 outside the outer wall, thereby realizing the direct gravity conduction of the weight in the whole inner tank 3 to the outside through the arc-shaped support body 10, avoiding the problem that the anticorrosion layer of the inner tank 3 is easily peeled off due to the deformation caused by the too long distance from the support position to the farthest end in the case of a single inner tank 3 being too long. At the same time, the arrangement of the sandwich cavity 5 and the annular support 4 outside the sandwich cavity 5 realizes the support reinforcement of the two adjacent inner tanks 3, thereby avoiding the deformation.

[0023] The control mode of the present application is automatically controlled by a controller, and the control circuit of the controller can be realized by simple programming of those skilled in the art, which is common knowledge in the art, and the present application is mainly used for protecting mechanical settings, so the control mode and circuit connection of the present application will not be explained in detail.

[0024] It should be understood that the above specific embodiments of the present application are only used for illustrative or explanatory purposes of the principles of the present application, and do not constitute a limitation on the present application. Therefore, any modification, equivalent replacement, improvement, etc. made without departing from the spirit and scope of the present application shall be included in the protection scope of the present application. In addition, the appended claims of the present application are intended to cover all variations and modifications falling within the scope and boundary of the appended claims, or the equivalent forms of such scope and boundary.

Claims

1. A corrosion protection structure for an LNG storage tank, characterized by: The utility model provides a kind of multi-internal tank pressure vessel, including outer tank (1);The outer tank (1) is fixed by being provided with the saddle support (2) in bottom;Multiple inner tanks (3) are provided in the outer tank (1);Multiple inner tanks (3) are independently enclosed and arranged in the outer tank (1);Multiple inner tanks (3) are arranged linearly in the outer tank (1);Each inner tank (3) is provided with pipeline group connected with outside;The inner tank (3) is fixed in the outer tank (1) by being provided with annular support (4) on both sides along linear direction;Annular support (4) and the annular support (4) of the outer wall of interlayer cavity (5) between two adjacent inner tanks (3) are correspondingly arranged with the saddle support (2) of the lower side of outer tank (1); The inner tank (3) is provided with interlayer cavity (5) close to other inner tank (3) side;The interlayer cavity (5) is provided with the same size as the cross section of inner tank (3);The interlayer cavity (5) is provided with the same annular support (4) as the inner tank (3) outside, and the annular support (4) is fixedly connected with the inner wall of outer tank (1) by the annular support (4).

2. The LNG storage tank corrosion protection structure according to claim 1, characterized by: The annular support (4) of the outer wall of interlayer cavity (5) between two adjacent inner tanks (3) and annular support (4) are correspondingly arranged with the saddle support (2) of the lower side of outer tank (1) with the width of saddle support (2).

3. The LNG storage tank corrosion protection structure according to claim 1, characterized by: The pipeline group includes upper connecting pipe (6) communicated with the inner tank (3);And a group of two lower connecting pipes (7) communicated with the inner tank (3);Two lower connecting pipes (7) extend out of outer tank (1) and are connected to surround a root.

4. The LNG storage tank corrosion protection structure according to claim 1, characterized by: Each inner tank (3) is provided with corresponding pressure gauge (8) outside outer tank (1).

5. The LNG storage tank corrosion protection structure according to any one of claims 1-2, wherein: The annular support (4) is provided with weight-reducing strip hole (9) equidistantly in circumferential direction.

6. The LNG storage tank corrosion protection structure according to claim 5, characterized by: The upper side of the saddle support (2) is arc-shaped support body (10) corresponding to the outer wall of outer tank (1);Arc-shaped support body (10) is connected with downwardly arranged base plate (11) on one side;And multiple longitudinal support plates (12) are arranged vertically and in parallel from base plate (11).

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