Low-temperature liquid storage tank with wave suppression function and inner tank thereof

Abstract

The application provides a low-temperature liquid storage tank with wave suppression function and an inner tank, which is different from the prior art in that the top of the inner tank is divided into a wave suppression top and a hanging top, the annular wave suppression top connected with the wall of the inner tank is welded with the wall of the inner tank, and when liquid is rolled due to liquid sloshing caused by earthquake and feeding operation, the wave surge towards the wall of the inner tank has the function of suppression and guiding the back fall; the hanging top is suspended below the top of the outer tank and located in the middle of the inner cylinder of the annular wave suppression top, the hanging top and the inner cylinder of the wave suppression top are connected by a flexible sealing structure, and the diameter of the hanging top is significantly smaller than the diameter of the inner tank. The setting of the wave suppression top can not only guide the flow of the shock wave generated by liquid sloshing, suppress and reduce the sloshing wave height of the liquid, but also move the connecting part between the hanging top of the inner tank and the wall of the inner tank from the edge of the wall of the inner tank to the inner cylinder of the wave suppression top, so that the hanging top and the flexible sealing structure avoid the impact of the sloshing wave and are protected from being damaged by the wave surge.

Description

TECHNICAL FIELD

[0001] The present application relates to a liquid storage container, in particular to a low-temperature liquid storage tank with wave suppression function and an inner tank thereof. BACKGROUND

[0002] In a low-temperature liquefied gas storage and transportation system, a concrete full containment low-temperature liquid storage tank and a bimetal full containment low-temperature liquid storage tank are main large-scale storage and transportation equipment, and the inner tank of each is a flat-bottomed, vertical, cylindrical open-top storage tank. The inner tank is provided with a ceiling at the top, and the outer tank is a flat-bottomed, vertical, cylindrical dome-top storage tank. The outer tank is made of concrete or metal, and the inner tank is made of metal. Under normal operating conditions, the inner tank is in a low-temperature state, and the outer tank is in a normal-temperature state.

[0003] Under seismic conditions, the low-temperature liquid in the inner tank will produce a large amount of sloshing, and the sloshing liquid will impact the inner tank wall and the ceiling. Since the inner tank ceiling is a thin-walled component with weak rigidity, and the connection between the inner tank wall and the ceiling is a flexible sealing structure, it is easy to be damaged under the impact of the liquid. The existing technology leaves a space greater than the sloshing wave height under the highest liquid level and the ceiling to avoid the surge from touching the ceiling and the flexible sealing structure during sloshing. This space is not the effective operating volume of the low-temperature liquid storage tank, and if some measures are taken to reduce this space while ensuring safety, it will help to improve the safety of the low-temperature liquid storage tank during an earthquake and reduce the construction cost of the low-temperature liquid storage tank. SUMMARY

[0004] The present application provides a low-temperature liquid storage tank with wave suppression function and an inner tank thereof capable of suppressing and reducing the liquid surface sloshing wave height during an earthquake, solves the problem that the ceiling and the flexible sealing structure between the ceiling and the inner tank wall are easily damaged by impact in the prior art, and can appropriately reduce the height of the inner tank wall under the condition of the same diameter and effective volume, and the height of the outer tank wall can also be correspondingly reduced.

[0005] To solve the above technical problems, the present application adopts the following technical solutions and has at least the following advantages and positive effects:

[0006] An inner tank of a low-temperature liquid storage tank with wave suppression function, comprising an inner tank wall, an inner tank bottom, a wave suppression top, a flexible sealing structure, and a ceiling, an annular wave suppression top with wave suppression and wave guiding functions is arranged between the inner tank wall and the ceiling, the wave suppression top is fixedly connected with the inner tank wall, and the wave suppression top and the ceiling are connected through the flexible sealing structure.

[0007] In an embodiment, the wave suppression top is a whole annular revolved body, and the generatrix thereof can be composed of at least two combinations of arc segments, oblique straight segments, horizontal segments, and vertical segments.

[0008] In some embodiments, the generatrix of the wave roof is any one of the following structures in which an arc segment is tangent to the inner tank wall, an arc segment is connected to the inner tank wall at an obtuse angle, and there is no arc segment.

[0009] In some embodiments, the generatrix of the wave roof is any one of the following structures in which an arc segment is tangent to the inner tank wall.

[0010] An arc segment, an oblique straight segment, and a vertical segment are connected in sequence, the arc segment is tangent to the inner tank wall, and the vertical segment and the ceiling are connected by a flexible sealing structure; or

[0011] An arc segment, an oblique straight segment, a horizontal segment, and a vertical segment are connected in sequence, the arc segment is tangent to the inner tank wall, and the vertical segment and the ceiling are connected by a flexible sealing structure; or

[0012] An arc segment, a horizontal segment, and a vertical segment are connected in sequence, the arc segment is tangent to the inner tank wall, and the vertical segment and the ceiling are connected by a flexible sealing structure.

[0013] In some embodiments, the generatrix of the wave roof is any one of the following structures in which an arc segment is connected to the inner tank wall at an obtuse angle.

[0014] An arc segment and a vertical segment are connected in sequence, the arc segment is connected to the inner tank wall at an obtuse angle, and the vertical segment and the ceiling are connected by a flexible sealing structure; or

[0015] An arc segment, a horizontal segment, and a vertical segment are connected in sequence, the arc segment is connected to the inner tank wall at an obtuse angle, and the vertical segment and the ceiling are connected by a flexible sealing structure.

[0016] In some embodiments, the generatrix of the wave roof is any one of the following structures without an arc segment.

[0017] An oblique straight segment and a vertical segment are connected in sequence, the oblique straight segment is connected to the inner tank wall, and the vertical segment and the ceiling are connected by a flexible sealing structure; or

[0018] An oblique straight segment, a horizontal segment, and a vertical segment are connected in sequence, the oblique straight segment is connected to the inner tank wall, and the vertical segment and the ceiling are connected by a flexible sealing structure; or

[0019] Multiple oblique straight segments and vertical segments are connected in sequence, the oblique straight segments are connected to the inner tank wall, and the vertical segments and the ceiling are connected by a flexible sealing structure; or

[0020] Multiple oblique straight segments, a horizontal segment, and a vertical segment are connected in sequence, the oblique straight segments are connected to the inner tank wall, and the vertical segments and the ceiling are connected by a flexible sealing structure.

[0021] In some embodiments, the wave suppression top inner surface is further fixedly provided with a wave suppression plate and / or a wave guide plate.

[0022] The wave suppression top and the suspended ceiling jointly form the top of the inner tank, and the diameter of the suspended ceiling is significantly smaller than the diameter of the inner tank.

[0023] A low-temperature liquid storage tank with wave suppression function, comprising an outer tank and the inner tank as described in any one of the above, wherein the inner tank is placed in the outer tank, the suspended ceiling of the inner tank is hung on the inner side of the top of the outer tank, and the inner tank bottom, the inner tank wall, the wave suppression top and the suspended ceiling of the inner tank are all provided with a thermal insulation layer between the inner tank and the outer tank.

[0024] The low-temperature liquid storage tank with wave suppression function and the inner tank provided by the present application have the following advantages. The top of the inner tank is divided into two parts, one is a ring-shaped wave suppression top fixedly connected with the inner tank wall, and the other is a suspended ceiling hung below the top of the outer tank, and the two are connected through a flexible sealing structure. The wave suppression top can not only guide and dredge the shock wave generated by the liquid when the liquid is shaken, but also reduce the liquid sloshing wave height. In addition, the connection part between the suspended ceiling and the inner tank wall is moved a distance from the edge of the inner tank wall to the center of the tank, and is higher in position and farther from the liquid surface, so that the suspended ceiling and the flexible sealing structure are avoided from being impacted by the sloshing wave, and the safety of the suspended ceiling and the flexible sealing structure from being impacted by the surge during an earthquake is significantly improved. In the case that the distance from the suspended ceiling to the liquid surface meets the standard specification requirements, the space reserved for the liquid sloshing wave height caused by the earthquake can be appropriately reduced in the range of the ring-shaped area of the wave suppression top, so that the height of the inner tank wall can be reduced, and the height of the outer tank wall can also be correspondingly reduced. The diameter of the suspended ceiling is relatively small, and the thermal insulation material between the wave suppression top and the outer tank can use relatively inexpensive expanded perlite. These characteristics will help to save the construction cost of the low-temperature tank. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a cross-sectional view of an embodiment of the low-temperature liquid storage tank with wave suppression function of the present application;

[0026] Figure 2 is a comparison diagram of the height of the low-temperature liquid storage tank with wave suppression function of the present application and the height of the storage tank of the prior art

[0027] Figure 3 is a cross-sectional view of an embodiment of the wave suppression top of the inner tank of the low-temperature liquid storage tank with wave suppression function of the present application;

[0028] Figure 4 is a cross-sectional view of an embodiment of the wave suppression top of the inner tank of the low-temperature liquid storage tank with wave suppression function of the present application;

[0029] Figure 5is a cross-sectional view of embodiment three of the wave suppression top of the inner tank of the low-temperature liquid storage tank with wave suppression function of the present application;

[0030] Figure 6 is a cross-sectional view of embodiment four of the wave suppression top of the inner tank of the low-temperature liquid storage tank with wave suppression function of the present application;

[0031] Figure 7 is a cross-sectional view of embodiment five of the wave suppression top of the inner tank of the low-temperature liquid storage tank with wave suppression function of the present application;

[0032] Figure 8 is a cross-sectional view of embodiment six of the wave suppression top of the inner tank of the low-temperature liquid storage tank with wave suppression function of the present application;

[0033] Figure 9 is a cross-sectional view of embodiment seven of the wave suppression top of the inner tank of the low-temperature liquid storage tank with wave suppression function of the present application;

[0034] Figure 10 is a cross-sectional view of embodiment eight of the wave suppression top of the inner tank of the low-temperature liquid storage tank with wave suppression function of the present application;

[0035] Figure 11 is a cross-sectional view of embodiment nine of the wave suppression top of the inner tank of the low-temperature liquid storage tank with wave suppression function of the present application;

[0036] Figure 12 is a cross-sectional view of embodiment ten of the wave suppression top of the inner tank of the low-temperature liquid storage tank with wave suppression function of the present application;

[0037] Figure 13 is a cross-sectional view of embodiment eleven of the wave suppression top of the inner tank of the low-temperature liquid storage tank with wave suppression function of the present application.

[0038] The reference signs are explained as follows:

[0039] 1a, low-temperature liquid storage tank with wave suppression function of the present application; 1b, prior art low-temperature liquid storage tank;

[0040] 2, inner tank; 20, inner tank bottom; 21, inner tank wall; 22, wave suppression top; 220, vertical section; 221, arc section; 222, straight section; 223, horizontal section; 224, wave suppression plate; 225, wave guide plate; 23, flexible sealing structure; 24, suspended top;

[0041] 3, outer tank;

[0042] 4, thermal insulation layer;

[0043] 5, pump column and piping system. DETAILED DESCRIPTION

[0044] The typical embodiments embodying the features and advantages of the present application will be described in detail in the following description. It should be understood that the present application can be varied in a wide range of embodiments, none of which depart from the scope of the present application, and that the description and drawings are to be regarded as illustrative in nature and not as restrictive.

[0045] In the description of the present application, it should be understood that the structure type chart of the wave suppression roof expresses the shape of the longitudinal section through the wave suppression roof axis of revolution, and the description of the arc segment, the oblique straight segment, the horizontal segment and the vertical segment refers to the generatrix of the wave suppression roof shell, which corresponds to the arc-shaped wave suppression roof shell, the conical wave suppression roof shell, the circular ring plate and the cylinder, respectively. The wave suppression plate and the wave guide plate are also oblique lines in the chart, which correspond to the conical wave suppression roof shell. There is one special point that the wave suppression plate and the wave guide plate can be a complete conical wave suppression roof shell or a discontinuous conical wave suppression roof shell segmented in the circumferential direction. In addition, the present application does not limit the size of each segment of the wave suppression roof shell and the wave suppression plate and the wave guide plate, and only gives a qualitative description of the position of the wave suppression plate and the wave guide plate. It should be understood that the present application indicates the structure type of the wave suppression roof and the functions thereof, and the specific size parameters need to be determined according to the size of the storage tank, the medium and the calculation of the seismic sloshing simulation. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0046] An inner tank 2 of a low-temperature liquid storage tank with wave suppression function comprises an inner tank bottom 20, an inner tank wall 21, a wave suppression roof 22, a flexible sealing structure 23 and a suspended roof 24. The inner tank bottom 20 is a circular flat plate member, and the inner tank wall 21 is a vertical cylindrical member.

[0047] The suspended roof 24 is a disc-shaped roof cover suspended on the inner side of the top of the outer tank 3 by a plurality of suspension rods. The wave suppression roof 22 is located between the inner tank wall 21 and the suspended roof 24 and is fixedly connected with the inner tank wall 21. The suspended roof 24 is connected with the wave suppression roof 22 through the flexible sealing structure 23. The flexible sealing structure 23 does not limit the relative movement between the wave suppression roof 22 and the suspended roof 24.

[0048] The wave suppression roof 22 is a revolution body, the generatrix of which is composed of an arc segment 221, an oblique straight segment 222, a horizontal segment 223 and a vertical segment 220, and the wave suppression roof 22 can be configured with a wave suppression plate 224 and a wave guide plate 225.

[0049] The inner tank roof is composed of the wave suppression roof 22 and the suspended roof 24. Under seismic working conditions, the wave suppression roof 22 has the functions of suppressing the sloshing wave height and guiding the liquid to fall back to the inner tank 2. Due to the arrangement of the wave suppression roof 22, on the one hand, the diameter of the suspended roof 24 is significantly smaller than the diameter of the inner tank 2 and can be installed at a position higher from the liquid surface, which can effectively avoid the impact of the surge; on the other hand, referring to Figure 2The height H2 of the low-temperature liquid storage tank 1a with wave suppression function of the present application is compared with the height H1 of the low-temperature liquid storage tank 1b of the prior art. Under the premise that the distance between the ceiling 24 and the liquid level is not less than the requirement of the standard specification, the height of the inner tank wall 21 can be appropriately reduced, thereby reducing the construction cost of the storage tank.

[0050] The wave suppression top 22 is a rotary body, the generatrix of which is composed of an arc segment 221, an inclined straight segment 222, a horizontal segment 223 and a vertical segment 220 appropriately combined, and different combination schemes and different configurations of wave suppression plates 224 and wave guide plates 225 can form various embodiments. According to the combination mode of the generatrix of the wave suppression top 22 rotary body, there are mainly (but not limited to) the following three categories and several small categories:

[0051] A: The arc segment 221 is connected to the inner tank wall 21 in a tangent manner, which has three small categories:

[0052] A1: The arc segment 221, the inclined straight segment 222 and the vertical segment 220 are connected in sequence, see Figure 3 .

[0053] A2: The arc segment 221, the inclined straight segment 222, the horizontal segment 223 and the vertical segment 220 are connected in sequence, see Figure 4 .

[0054] A3: The arc segment 221, the horizontal segment 223 and the vertical segment 220 are connected in sequence, see Figure 5 .

[0055] B: The arc segment 221 is connected to the inner tank wall 21 in an obtuse manner, which has two small categories:

[0056] B1: The arc segment 221 and the vertical segment 220 are connected in sequence, see Figure 6 .

[0057] B2: The arc segment 221, the horizontal segment 223 and the vertical segment 220 are connected in sequence, see Figure 7 .

[0058] C: There is no arc segment structure, and the inclined straight segment 222 is connected to the inner tank wall 21, which has four small categories:

[0059] C1: The inclined straight segment 222 and the vertical segment 220 are connected in sequence, see Figure 8 .

[0060] C2: The inclined straight segment 222, the horizontal segment 223 and the vertical segment 220 are connected in sequence, see Figure 9 .

[0061] C3: A plurality of inclined straight segments 222 and vertical segments 220 are connected in sequence, see Figure 10 .

[0062] C4: multiple straight inclined sections 222, horizontal sections 223, vertical sections 220 are connected in sequence, see Figure 11 .

[0063] In each of the above structures, the vertical section 220 is connected with the suspended ceiling 24 through the flexible sealing structure 23.

[0064] The arc section 221, the straight inclined section 222, the horizontal section 223 and the vertical section 220 referred to herein refer to the generatrix of the rotating body of the wave suppression ceiling 22, which correspondingly are the arc-shaped rotating shell, the conical rotating shell, the circular ring plate and the cylinder, respectively.

[0065] The above various structures can be used directly or in combination with the wave suppression plate 224 and the wave guide plate 225. The wave suppression plate 224 and the wave guide plate 225 can be combined with the above various structures respectively or jointly to form more implementation cases. For example, on the basis of the C4 type, the wave suppression plate 224 and the wave guide plate 225 are arranged, as shown in Figure 12 ; on the basis of the B2 type, the wave guide plate 225 is arranged, as shown in Figure 13 .

[0066] The wave suppression plate 224 can be arranged on the inner tank wall 21 near the part connected with the wave suppression ceiling 22, or can be arranged at the arc section 221 and the straight inclined section 222, and plays a role in suppressing the waves. The wave guide plate 225 can be arranged on the straight inclined section 222 or the horizontal section 223 near the vertical section 220, and guides the waves to the lower part to make them fall as soon as possible, avoiding the impact on the flexible sealing structure 23 and the suspended ceiling 24.

[0067] The vertical section 220 is a connecting member of the wave suppression ceiling 22 and the flexible sealing structure 23, and also plays a role in blocking the liquid flowing along the wave suppression ceiling 22 from impacting the flexible sealing structure 23 and the suspended ceiling 24, and can make the installation height of the suspended ceiling 24 have a larger selection range, adapting to the needs of different design conditions.

[0068] Referring to Figure 1 , a low-temperature liquid storage tank 1a with wave suppression function includes an outer tank 3, a thermal insulation layer 4, a pump column and a pipeline system 5, and the above-mentioned inner tank 2. Among them, the inner tank 2 is placed in the outer tank 3, the suspended ceiling 24 of the inner tank 2 is suspended below the top of the outer tank 3, and the inner tank bottom 20, the inner tank wall 21, the wave suppression ceiling 22 and the suspended ceiling 24 of the inner tank 2 are provided with the thermal insulation layer 4 between the outer tank 3.

[0069] Referring to Figure 1 , a low-temperature liquid storage tank 1a with wave suppression function includes an inner tank 2 and an outer tank 3. Among them, the outer tank 3 is a flat bottom, vertical, cylindrical dome ceiling tank, and the outer tank 3 is made of concrete or metal. The inner tank 2 is placed in the outer tank 3, and the outer tank 3 surrounds the inner tank 2.

[0070] The inner tank 2 and the outer tank 3 are both cylindrical and are revolution bodies relative to the central axis.

[0071] The inner tank 2 is mainly made of metal and comprises an inner tank bottom 20, an inner tank wall 21, a wave suppression top 22, a flexible sealing structure 23 and a suspended top 24. The inner tank bottom 20 is flat, and the inner tank wall 21 is a vertical cylinder. Different from the prior art, the inner tank top is composed of the wave suppression top 22, the flexible sealing structure 23 and the suspended top 24.

[0072] The upper end of the inner tank wall 21 of the inner tank 2 is connected with the wave suppression top 22, and the two are welded to form an integral body and reinforce each other, so that the rigidity is greatly increased and the inner tank can resist the surge impact of the shaking liquid during an earthquake. The suspended top 24 is located in the central cylinder of the wave suppression top 22 and is connected with the wave suppression top 22 through the flexible sealing structure 23 to form the top of the inner tank. The lower end of the inner tank wall 21 is welded with the inner tank bottom 20 to form a closed end. The inner tank bottom 20, the inner tank wall 21, the wave suppression top 22 and the suspended top 24 of the inner tank 2 are provided with a thermal insulation layer 4 between the inner tank 2 and the outer tank 3.

[0073] Referring to Figure 6 As shown in the figure, the connection between the arc segment 221 and the inner tank wall 21 is an obtuse angle. In this way, the curvature of the arc segment 221 is smaller, so as to facilitate the manufacturing.

[0074] Referring to Figure 12 As shown in the figure, the inner tank 2 further comprises a wave suppression plate 224 fixedly arranged along the inner surface of the inner tank wall 21. The wave suppression plate 224 is located near the connection between the arc segment 221 and the inner tank wall 21, and is close to the arc segment 221 to reduce the impact of the surge on the welding seam between the arc segment 221 and the inner tank wall 21.

[0075] The wave suppression plate 224 can be an integral conical shell (a whole revolution body) or a conical shell-shaped baffle arranged in segments in the circumferential direction. The wave suppression plate 224 is welded with the inner tank wall 21 and can effectively share the impact force of the surging liquid on the obtuse angle connection part.

[0076] In addition to being made of a flat plate, the wave suppression plate 224 can also be made of a corrugated plate to enhance its rigidity.

[0077] Referring to Figure 12 and Figure 13 As shown in the figure, the inner tank 2 further comprises a wave guide plate 225 arranged inside the wave suppression top 22 at a position close to the vertical segment 220, so as to guide the surge returning along the wave suppression top 22 downward to make it quickly fall back and avoid a large impact on the vertical segment 220.

[0078] The wave guide plate 225 can be a whole conical shell (a whole revolution body), or can be a conical shell shaped baffle arranged uniformly in circumferential segments, which is welded with the arc segment 221 or the inclined straight segment 222 or the horizontal segment 223 of the wave suppression top 22, and can effectively share the impact force of the surging liquid to the vertical segment 220. In addition to being made of a flat plate, the wave guide plate 225 can also be made of a corrugated plate to enhance its rigidity.

[0079] The setting effect of the wave suppression plate 224 and the wave guide plate 225, and the overall effect of the wave suppression top 22, can be evaluated by seismic simulation calculation.

[0080] The wave suppression top 22 as a fixed component can guide and dredge the impact wave generated by the liquid sloshing, reduce the sloshing wave height of the liquid, avoid the impact of the sloshing liquid to the suspended ceiling 24 and the flexible sealing structure 23, and also can strengthen the tank wall and increase the rigidity of the tank wall. The presence of the wave suppression top 22 reduces the diameter of the suspended ceiling 24 and shortens the circumference of the suspended ceiling 24, which means that the length of the flexible sealing structure 23 between the suspended ceiling 24 and the vertical segment 220 (cylinder) of the wave suppression top 22 is shortened, which is beneficial to reduce the evaporation of the low-temperature liquid.

[0081] In addition, due to the reduction of the diameter of the suspended ceiling 24, it can be installed at a position farther and higher from the liquid surface, so that the sloshing liquid cannot reach the suspended ceiling 24, and the safety of the suspended ceiling 24 during the earthquake is improved.

[0082] The reduction of the area of the suspended ceiling 24 also expands the use of the cheap insulation material expanded perlite of the thermal insulation layer 4, reduces the use of the higher-priced thermal insulation cotton, and is beneficial to reduce the construction cost.

[0083] Compared with the inner tank structure of the prior art, under the condition that the diameter and the effective volume are the same, the setting of the wave suppression top 22 on the inner tank 2 can effectively suppress the sloshing and rolling of the liquid during the earthquake, effectively reduce the sloshing wave height of the liquid in the tank, reduce the height of the reserved space above the highest liquid level of the annular area covered by the wave suppression top 22, thereby reducing the height of the inner tank wall 21, and correspondingly reducing the height of the tank wall of the outer tank 3, the diameter of the suspended ceiling 24 is smaller and the position is higher, the distance between the suspended ceiling 24 and the top of the outer tank 3 is shortened, and the length of the pull rod of the suspended ceiling 24 is also shortened, thereby saving the construction and building cost of the low-temperature liquid storage tank 1a with wave suppression function.

[0084] While the application has been described with respect to several exemplary embodiments, it will be appreciated that those skilled in the art, upon attaining an understanding of the nature of the application, can readily apply the teachings herein to other and different embodiments or limited details without departing from the spirit and scope of the application. Therefore, the above-described embodiments are to be considered in all respects as only illustrative and not restrictive, the scope of the application to be indicated by the appended claims rather than the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are to be embraced therein.

Claims

1. A low-temperature liquid storage tank inner tank having a wave suppression function, comprising an inner tank wall, an inner tank bottom, a wave suppression top, a flexible sealing structure, and a ceiling, characterized by, An annular wave-suppression roof with wave-suppression and wave-guiding functions is arranged between the inner tank wall and the ceiling, the wave-suppression roof is fixedly connected with the inner tank wall, and the wave-suppression roof and the ceiling are connected through a flexible sealing structure for suppressing the sloshing wave height and guiding the liquid to fall back to the inner tank; The wave-suppression roof is an annular rotary body as a whole, and the generatrix thereof is composed of at least two combinations of an arc segment, an oblique straight segment, a horizontal segment and a vertical segment; The inner surface of the wave-suppression roof is fixedly provided with a wave-suppression plate and / or a wave-guiding plate; The wave-suppression roof and the ceiling jointly form the top of the inner tank, and the diameter of the ceiling is smaller than that of the inner tank.

2. The inner can according to claim 1, characterized in that The generatrix of the wave-suppression roof is any one of the following structures in which an arc segment is tangent to the inner tank wall, an arc segment is connected to the inner tank wall at an obtuse angle, and there is no arc segment.

3. The inner canister of claim 2, wherein, The generatrix of the wave-suppression roof is any one of the following structures in which an arc segment is tangent to the inner tank wall: The arc segment, the oblique straight segment and the vertical segment are sequentially connected, the arc segment is tangent to the inner tank wall, and the vertical segment and the ceiling are connected through a flexible sealing structure; Or The arc segment, the oblique straight segment, the horizontal segment and the vertical segment are sequentially connected, the arc segment is tangent to the inner tank wall, and the vertical segment and the ceiling are connected through a flexible sealing structure; Or The arc segment, the horizontal segment and the vertical segment are sequentially connected, the arc segment is tangent to the inner tank wall, and the vertical segment and the ceiling are connected through a flexible sealing structure.

4. The inner canister of claim 2, wherein The generatrix of the wave-suppression roof is any one of the following structures in which an arc segment is connected to the inner tank wall at an obtuse angle: The arc segment and the vertical segment are sequentially connected, the arc segment is connected to the inner tank wall at an obtuse angle, and the vertical segment and the ceiling are connected through a flexible sealing structure; Or The arc segment, the horizontal segment and the vertical segment are sequentially connected, the arc segment is connected to the inner tank wall at an obtuse angle, and the vertical segment and the ceiling are connected through a flexible sealing structure.

5. The inner canister of claim 2, wherein The generatrix of the wave-suppression roof is any one of the following structures without an arc segment: The oblique straight segment and the vertical segment are sequentially connected, the oblique straight segment is connected to the inner tank wall, and the vertical segment and the ceiling are connected through a flexible sealing structure; or The oblique straight segment, the horizontal segment and the vertical segment are sequentially connected, the oblique straight segment is connected to the inner tank wall, and the vertical segment and the ceiling are connected through a flexible sealing structure; Or A plurality of oblique straight segments and vertical segments are sequentially connected, the oblique straight segments are connected to the inner tank wall, and the vertical segments and the ceiling are connected through a flexible sealing structure; Or A plurality of oblique straight segments, horizontal segments and vertical segments are sequentially connected, the oblique straight segments are connected to the inner tank wall, and the vertical segments and the ceiling are connected through a flexible sealing structure.

6. The inner canister of claim 1, wherein, The height of the inner tank wall can be appropriately reduced on the premise that the height of the inner tank from the liquid surface to the ceiling is not less than the requirement of a standard specification.

7. A low-temperature liquid storage tank having a wave suppression function, characterized by comprising: The inner tank is arranged in the outer tank, the ceiling of the inner tank is suspended on the inner side of the top of the outer tank, and a heat preservation layer is arranged between the inner tank bottom, the inner tank wall, the wave-suppression roof, the ceiling of the inner tank and the outer tank.

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