Supporting structure and double-layer spherical tank

Abstract

The invention provides a supporting structure and a double-layer spherical tank. The supporting structure comprises a plurality of inner supporting structures and an outer supporting structure. The inner supporting structures are arranged between an inner spherical tank body and an outer spherical tank body of the double-layer spherical tank, the multiple inner supporting structures are arranged on a first plane, the first plane is lower than the plane, passing through the sphere center, in the inner spherical tank body, and the multiple inner supporting structures are evenly distributed in the circumferential direction of the inner spherical tank body. The inner supporting structure comprises an inner spherical tank contact surface which is not in fixed contact with the inner spherical tank and an outer spherical tank contact surface which is not in fixed contact with the outer spherical tank; the inner supporting structure can slide relative to the inner spherical tank; the strength of the inner supporting structure meets the strength condition of the inner supporting structure established according to a first strength theory; the outer supporting structure is connected with the outer spherical tank and used for supporting the outer spherical tank on the ground surface, the supporting structure is of a simple structure, manufacturing and assembling are easy, and the good freedom degree and the good heat insulation effect are achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of storage tanks, in particular to a support structure and a double-layer spherical tank. BACKGROUND

[0002] Liquid hydrogen has become the core carrier to achieve the goal of "carbon neutralization" due to its ultra-high volume energy density and zero carbon emission characteristics. Therefore, in the fields of aerospace, marine and civilian hydrogen energy, large spherical tanks stand out due to their geometric advantages. The spherical tank has the smallest surface area under the same volume, significantly reducing the risk of environmental heat leakage. In addition, the stress distribution of the spherical shell is uniform, and the pressure-bearing capacity is stronger, which is suitable for large-volume liquid hydrogen storage and breaks through the volume limit of traditional steel storage tanks.

[0003] For a double-layer large liquid hydrogen spherical tank storing liquid hydrogen, in order to ensure the stability of the inner and outer spherical tanks, an inner and outer support structure with sufficient strength is essential. At the same time, liquid hydrogen spherical tanks are easily affected by external environmental heat leakage, so the accumulation of heat insulation or vacuum insulation technology is often used between the inner and outer tanks to reduce environmental heat leakage. However, the support structure is the main heat bridge in the tank, and the heat leakage through the inner support accounts for 30% of the total heat leakage of the spherical tank, so how to reduce the heat leakage of the inner support structure is a core problem in the development process of double-layer large liquid hydrogen spherical tanks.

[0004] The existing Chinese patent with publication number CN116717718A discloses a low-temperature double-metal liquid hydrogen spherical tank with an inner and outer support system. It includes a pile foundation fixed to the ground, with an outer support on the pile foundation; the outer support is fixed above the pile foundation, and the outer support bottom is provided with a connection part connected to the inclined support, the inclined supports are connected to the outer support columns in pairs, the outer side of the outer spherical tank is provided with a reinforcing ring, the inner spherical tank is arranged inside the outer spherical tank, and the inner spherical tank is connected to the inner wall of the outer spherical tank through the inclined rod. The inclined rod is connected to the double-layer spherical tank in a ring buckle manner and allows the inner layer spherical tank to shrink and deform when the temperature changes. A cold insulation system is provided between the inner and outer spherical tanks. It can solve the problems of liquid hydrogen spherical tank inner support and spherical tank shrinkage deformation, and ensure the safe and stable operation of the low-temperature storage liquid hydrogen equipment through the air-tight system of the device.

[0005] However, the existing support structure of the liquid hydrogen spherical tank and the support system structure provided by CN116717718A are complex and have poor freedom, and cannot balance stability, high freedom and small heat leakage. SUMMARY

[0006] In view of the defects in the prior art, the purpose of the present application is to provide a support structure and a double-layer spherical tank.

[0007] According to the support structure provided by the present application, the support structure comprises a plurality of inner support structures and an outer support structure. The inner support structure is arranged between the inner sphere and the outer sphere of the double-layered spherical tank, and is used to support the inner sphere inside the outer sphere. A plurality of the inner support structures are arranged on a first plane, which is lower than a plane passing through the sphere center in the inner sphere, and the plurality of the inner support structures are uniformly arranged along the circumference of the inner sphere. The inner support structure comprises an inner sphere contact surface not in fixed contact with the inner sphere and an outer sphere contact surface not in fixed contact with the outer sphere, and the inner support structure is slidable up and down relative to the inner sphere. The strength of the inner support structure satisfies the strength condition of the inner support structure established according to the first strength theory. The outer support structure connects the outer sphere and the ground surface, and is used to support the outer sphere on the ground surface.

[0008] Preferably, the inner support structure comprises an upper support, an intermediate support column and a lower support arranged from top to bottom. The upper support comprises the inner sphere contact surface, a first rib plate group and a first support column support surface arranged from top to bottom, and the lower support comprises a second support column support surface, a second rib plate group and the outer sphere contact surface arranged from top to bottom. The cross-sectional area and length of the intermediate support column satisfy the strength condition of the inner support structure established according to the first strength theory, the number and thickness of the ribs of the first rib plate group satisfy the strength condition of the upper support established according to the first strength theory, and the number and thickness of the ribs of the second rib plate group satisfy the strength condition of the lower support established according to the first strength theory.

[0009] Preferably, the upper support, the intermediate support column and the lower support are fixedly connected.

[0010] Preferably, the upper support is a stainless steel upper support, the lower support is a stainless steel lower support, and the intermediate support column is a glass fiber reinforced plastic solid column.

[0011] Preferably, the first rib plate group and the second rib plate group respectively comprise a plurality of short rib plates and a long rib plate, the plurality of short rib plates are parallel to each other and perpendicular to the long rib plate, and the long rib plate intersects with the midpoint of the short rib plate at the edge. The first support column support surface and the second support column support surface are two identical cuboids.

[0012] Preferably, the inner sphere contact surface is a rectangle consistent with the curvature of the inner sphere, and the outer sphere contact surface is a rectangle consistent with the curvature of the outer sphere.

[0013] Preferably, the outer support structure is a skirt structure, the bottom of the outer support structure is fixedly connected with the ground by bolts, and the top is connected with the equator of the side surface of the outer spherical tank.

[0014] According to the application, a double-layer spherical tank is provided, which adopts the support structure described in any one of the above aspects, and further comprises an outer spherical tank, an inner spherical tank and a sandwiched heat insulation material. The inner spherical tank is arranged in the cavity of the outer spherical tank by an inner support structure. The sandwiched heat insulation material is filled between the outer spherical tank and the inner spherical tank. The outer spherical tank is supported on the ground by an outer support structure.

[0015] Preferably, the top end of the outer spherical tank of the double-layer spherical tank is provided with a dome communicating with the inner spherical tank, the dome is used for supporting and stabilizing the inner spherical tank, and loading and unloading are realized.

[0016] Preferably, the inner spherical tank is a 304 stainless steel inner tank, and the outer spherical tank is a cast steel outer tank.

[0017] Compared with the prior art, the application has the following beneficial effects: 1. The support structure composed of the supports tangent to the inner and outer spherical tanks and the struts connecting the two supports realizes the surface contact of the support structure with the spherical tank, the contact area is large, the support stability of the inner support structure is high, the support structure is not fixedly contacted with the inner and outer spherical tanks, when the liquid hydrogen spherical tank is cold contracted, the inner tank and the inner support structure can avoid the stress concentration phenomenon at the inner support structure of the spherical tank by relative sliding, the freedom degree of the support structure is high, the strength of the inner support structure meets the strength condition of the inner support structure established according to the first strength theory, the strength of the inner support structure is the minimum limit value, the heat leakage of the inner support structure is small, and the heat insulation performance of the double-layer spherical tank is improved. 2. The application is an integrated structure composed of the spherical tank contact surface, the connecting rib plate group, the strut support surface and the intermediate strut structure, and is simple in installation structure. BRIEF DESCRIPTION OF DRAWINGS

[0018] Other features, objects and advantages of the application will become more apparent from the following detailed description of non-limiting embodiments, made with reference to the accompanying drawings: Figure 1 The application mainly embodies the structure of a double-layer spherical tank; Figure 2 The application mainly embodies the structure of an inner support structure; Figure 3 The application mainly embodies the distribution of the inner support structure of the double-layer spherical tank in the top view direction.

[0019] As shown in the figure: 1, dome; 2, outer tank; 3, inner tank; 4, sandwich insulation material; 5, inner support structure; 6, outer support structure; 511 inner spherical tank contact surface; 512, first rib plate group; 513, first pillar support surface; 52, intermediate pillar; 531, pillar support surface; 532, second rib plate group; 533, outer spherical tank contact surface; 51, upper support; 53, lower support. DETAILED DESCRIPTION

[0020] The application will be described in detail below with specific examples. The following examples will help those skilled in the art to further understand the application, but do not limit the application in any form. It should be noted that for those skilled in the art, without departing from the concept of the application, a number of changes and improvements can be made. These are within the scope of the application.

[0021] As shown in the figure, according to the support structure provided by the application, it comprises: a plurality of inner support structures 5 and outer support structures 6. Figure 1

[0022] The inner support structure 5 is arranged between the inner spherical tank 3 and the outer spherical tank 2 of the double-layer spherical tank, and the inner support structure 5 is used to support the inner spherical tank 3 inside the outer spherical tank 2.

[0023] The plurality of inner support structures 5 are arranged on a first plane, and the inner support structure 5 is not fixedly matched with the inner spherical tank 3 and the outer spherical tank 2, so the position of the plane where the inner support structure 5 is located is crucial to the stability of the support of the inner spherical tank 3. The first plane is lower than the plane passing through the center of the inner spherical tank 3, and the plurality of inner support structures 5 are uniformly arranged along the circumference of the inner spherical tank 3.

[0024] The inner support structure 5 comprises an inner spherical tank contact surface 511 which is not in fixed contact with the inner spherical tank 3, and an outer spherical tank contact surface 533 which is not in fixed contact with the outer spherical tank 2; the inner support structure 5 can slide up and down relative to the inner spherical tank 3. The inner spherical tank contact surface 511 is matched with the inner spherical tank 3 in a frictional surface contact manner, and the outer spherical tank contact surface 533 is matched with the outer spherical tank 2 in a frictional surface contact manner.

[0025] The strength of the inner support structure 5 meets the strength condition of the inner support structure 5 established according to the first strength theory.

[0026] The outer support structure 6 connects the outer spherical tank 2 with the ground surface, and is used to support the outer spherical tank 2 on the ground surface.

[0027] When the inner spherical tank 3 is in a normal state, the inner support structure 5 is uniformly arranged along the circumference of the inner spherical tank 3 in the first plane, the inner spherical tank contact surface 511 of the inner support structure 5 is not in fixed contact with the inner spherical tank 3, the outer spherical tank contact surface 533 of the inner support structure 5 is not in fixed contact with the outer spherical tank 2, and the inner support structure 5 supports the inner spherical tank 3.

[0028] ​When the inner spherical tank 3 experiences cold contraction, the inner support structure 5 slides upwards or downwards relative to the inner spherical tank 3. The inner support structure 5 slides relative to the surface of the inner spherical tank 3, preventing stress concentration at the inner support structure 5, and the inner support structure 5 has a high degree of freedom. The inner support structure 5 continues to support the inner spherical tank 3.

[0029] The inner support structure 5 is not in fixed contact with the inner spherical tank 3 and the outer spherical tank 2. When the double-layer spherical tank is cooled and contracted, the inner spherical tank 3 and the inner support structure 5 can slide relative to each other to avoid stress concentration at the inner support structure 5 of the double-layer spherical tank. The support structure has a high degree of freedom.

[0030] The inner support structure 5 includes an inner spherical tank contact surface 511 that is not in fixed contact with the inner spherical tank 3, and an outer spherical tank contact surface 533 that is not in fixed contact with the outer spherical tank 2. The inner support structure 5 has a surface contact with both the inner spherical tank 3 and the outer spherical tank 2, resulting in a large contact area and high support stability.

[0031] The strength of the inner support structure 5 satisfies the strength condition of the inner support structure 5 established according to the first strength theory; at this time, the strength of the inner support structure 5 is the minimum limit value, and the heat leakage of the inner support structure 5 is small.

[0032] Specifically, addressing the problems of complex support structures for existing double-layered large liquid hydrogen spherical tanks and significant heat leakage from the external environment through these structures, the support structure provided by this invention employs a relatively simple structure, which is not only easy to manufacture and assemble but also offers good flexibility and insulation performance.

[0033] like Figure 2 As shown, in some feasible embodiments, the inner support structure 5 includes an upper support 51, a middle support column 52, and a lower support 53 arranged from top to bottom; the upper support 51 includes an inner spherical tank contact surface 511, a first rib plate group 512, and a first support column support surface 513 arranged from top to bottom; the lower support 53 includes a second support column support surface 531, a second rib plate group 532, and an outer spherical tank contact surface 533 arranged from top to bottom. That is, the inner support structure 5 consists of an inner spherical tank contact surface 511, a first rib plate group 512, a first support column support surface 513, a middle support column 52, a second support column support surface 531, a second rib plate group 532, and an outer spherical tank contact surface 533 arranged from top to bottom.

[0034] Specifically, the inner spherical tank contact surface 511 and the first pillar support surface 513 are directly connected by the first rib plate group 512 to form the upper support 51; the second pillar support surface 531 and the outer spherical tank contact surface 533 are directly connected by the second rib plate group 532 to form the lower support 53.

[0035] To reduce heat leakage in the internal support structure 5, the smaller the cross-sectional area and the longer the length of the intermediate column 52, the less heat leakage in the internal support structure 5. However, the smaller the cross-sectional area and the longer the length of the fiberglass column 52, the weaker the strength of the internal support structure 5.

[0036] In some feasible implementations, the cross-sectional area and length of the intermediate support column 52 are set to meet the strength conditions of the inner support structure 5 established according to the first strength theory. In this case, the heat loss through the inner support structure 5 is reduced while satisfying the minimum strength of the inner support structure 5.

[0037] The smaller the cross-sectional area and the longer the length of the first rib group 512 between the inner spherical tank contact surface 511 and the first pillar support surface 513 of the upper support 51, the less heat leakage the upper support 51 will have. However, a smaller cross-sectional area of ​​the first rib group 512 means a reduction in the number of short ribs or a reduction in the thickness of the first rib group 512, which will reduce the strength of the upper support 51 and thus cause instability in the inner tank 3.

[0038] In some feasible implementations, the number and thickness of the ribs of the first rib group 512 are set to meet the strength conditions of the upper support 51 established according to the first strength theory. In this case, the heat leakage through the inner support structure 5 is reduced while satisfying the minimum strength of the upper support 51.

[0039] The smaller the cross-sectional area and the longer the length of the second rib assembly 532 between the outer spherical tank contact surface 533 and the second pillar support surface 531 of the lower support 53, the less heat leakage the lower support 53 will have. However, a smaller cross-sectional area of ​​the second rib assembly 532 means a reduction in the number of short ribs or a reduction in the thickness of the second rib assembly 532, which will reduce the strength of the lower support 53 and thus cause instability in the inner tank 3.

[0040] In some feasible implementations, the number and thickness of the ribs in the second rib group 532 satisfy the strength conditions of the lower support 53 established according to the first strength theory. In this case, while satisfying the minimum strength of the lower support 53, the heat loss through the inner support structure 5 is reduced.

[0041] In some feasible embodiments, the upper support 51, the intermediate support column 52, and the lower support 53 are fixedly connected. The inner support structure 5 is an integrally formed structure, forming a complete inner support structure 5.

[0042] In some feasible implementations, the upper support 51 is a stainless steel upper support, the lower support 53 is a stainless steel lower support, and the intermediate column 52 is a fiberglass solid column.

[0043] In some feasible embodiments, the first rib group 512 and the second rib group 532 are each composed of 6 to 8 short ribs and one long rib. The short ribs are parallel to each other and perpendicular to the long rib. The long rib intersects the midpoint of the short ribs at the edge. The first support surface 513 and the second support surface 531 are two identical cuboids.

[0044] In some feasible embodiments, the inner spherical tank contact surface 511 is a rectangle with the same curvature as the inner spherical tank 3, and the outer spherical tank contact surface 533 is a rectangle with the same curvature as the outer spherical tank 2. That is, the upper support 51 is tangent to the inner spherical tank 3, and the lower support 53 is tangent to the outer spherical tank 2.

[0045] In some feasible implementations, the outer support structure 6 is a skirt structure. The bottom of the outer support structure 6 is fixed to the ground surface by bolts, and the top is tangentially connected to the equatorial line of the side of the outer spherical tank 2. Specifically, to improve the stability of the liquid hydrogen spherical tank and reduce the evaporation rate of liquid hydrogen, the liquid hydrogen spherical tank is partially placed below the ground surface. The lower end of the outer support structure 6 is usually anchored to the ground surface by bolts, and the upper end is tangentially fixed to the equatorial line of the outer tank 2. This not only achieves the stable support requirements of the liquid hydrogen spherical tank but also reduces environmental heat loss by reducing environmental thermal radiation.

[0046] In some feasible implementations, generally, the more internal support structures 5 are provided, the more stable the support of the inner spherical tank 3 will be. However, the more internal support structures 5 are provided, the more leakage hotspots will be generated in the inner spherical tank 3. Specifically, 10 to 14 internal support structures 5 are provided, all located on the same plane, and the included angle between each pair of internal support structures 5 is equal.

[0047] According to the present invention, a double-layered spherical tank, employing any of the aforementioned support structures, further includes: an outer spherical tank 2, an inner spherical tank 3, and a sandwich insulation material 4. The outer spherical tank 2 is fitted over the inner spherical tank 3. The inner spherical tank 3 is stabilized by multiple internal support structures 5 disposed between the inner spherical tank 3 and the outer spherical tank 2, and the internal support structures 5 are evenly distributed along the circumference of the inner spherical tank 3. The outer spherical tank 2 is supported on the ground by an outer support structure 6. The sandwich insulation material fills the annular space between the outer spherical tank 2 and the inner spherical tank 3.

[0048] In some feasible implementations, the double-walled spherical tank is a liquid hydrogen spherical tank. Similarly, the double-walled spherical tank can be used to store cryogenic liquid media, such as liquid oxygen, liquefied ethylene, liquefied natural gas, liquid ammonia, liquid helium, etc.

[0049] In some feasible implementations, the storage volume of the double-walled spherical tank can be 5,000 to 10,000 cubic meters.

[0050] In some feasible embodiments, the top of the outer spherical tank 2 of the double-layer spherical tank is provided with a dome 1 that communicates with the inner spherical tank 3. The dome 1 connects the inner spherical tank 3 with the outside world to realize the loading and unloading of the double-layer spherical tank. The dome 1 is fixedly connected to the outer spherical tank 2 and the inner spherical tank 3. While satisfying the loading and unloading of the double-layer spherical tank, it not only has a simple structure, but also supports and stabilizes the inner spherical tank 3, thereby reducing the strength of the internal support structure 5 between the outer spherical tank 2 and the inner spherical tank 3.

[0051] In some feasible implementations, the inner spherical tank 3 is a 304 stainless steel inner tank, and the outer spherical tank 2 is a cast steel outer tank.

[0052] In some feasible implementations, an internal support structure 5 is designed for an 8000 cubic meter liquid hydrogen spherical tank. By analyzing the relationship between the cross-sectional area and length of the fiberglass support column 52 and the strength of the internal support structure 5, it is found that when the length of the fiberglass support column 52 is 500 mm and the length and width of the cross-sectional area are 650 mm and 560 mm respectively, the heat loss through the internal support structure 5 can be reduced while still meeting the strength requirements of the internal support structure 5.

[0053] By analyzing the relationship between the number and thickness of the ribs in the first rib group 512 and the second rib group 532 and the strength of the upper support 51 and the lower support 53, it was found that the first rib group 512 and the second rib group 532 are composed of six short ribs and one long rib, respectively. The short ribs are 600 mm long and the long ribs are 960 mm long. When the first rib group 512 and the second rib group 532 are 20 mm wide and 300 mm high, the heat leakage from the environment through the internal support structure 5 can be reduced while satisfying the strength of the upper support 51 and the lower support 53.

[0054] The support stability of the inner spherical tank 3 was studied by examining the height of the plane where the inner support structure 5 is located in the annular space between the outer spherical tank 2 and the inner spherical tank 3. The results showed that when the distance between the plane where the inner support structure 5 is located and the plane passing through the center of the inner spherical tank 3 is 5500mm, the inner support structure 5 has good support stability and degree of freedom.

[0055] like Figure 3 As shown, after designing the specific structure of the inner support structure 5, only 12 inner support structures 5 need to be set between the outer spherical tank 2 and the inner spherical tank 3 to support the inner spherical tank 3, which can meet the strength requirements of the inner support structure 5 and the support stability requirements of the inner spherical tank 3. In this embodiment, each inner support structure 5 is rotationally symmetrical with respect to the vertical center line of the inner spherical tank 3, and all inner support structures 5 are located on the same plane.

[0056] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0057] Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A support structure, characterized in that, include: Multiple internal support structures (5) and external support structures (6); The inner support structure (5) is disposed between the inner spherical tank (3) and the outer spherical tank (2) of the double-layer spherical tank. The inner support structure (5) is used to support the inner spherical tank (3) inside the outer spherical tank (2). Multiple inner support structures (5) are disposed on a first plane, the first plane being lower than the plane passing through the center of the sphere inside the inner spherical tank (3), and the multiple inner support structures (5) are evenly arranged along the circumference of the inner spherical tank (3); The inner support structure (5) includes an inner spherical tank contact surface (511) that is not in fixed contact with the inner spherical tank (3) and an outer spherical tank contact surface (533) that is not in fixed contact with the outer spherical tank (2); the inner support structure (5) can slide up and down relative to the inner spherical tank (3); The strength of the inner support structure (5) satisfies the strength condition of the inner support structure (5) established according to the first strength theory; The outer support structure (6) connects the outer spherical tank (2) to the ground surface and is used to support the outer spherical tank (2) on the ground surface.

2. The support structure as described in claim 1, characterized in that, The internal support structure (5) includes an upper support (51), a middle support (52), and a lower support (53) arranged from top to bottom. The upper support (51) includes, from top to bottom, the inner spherical tank contact surface (511), the first rib plate group (512), and the first pillar support surface (513); the lower support (53) includes, from top to bottom, the second pillar support surface (531), the second rib plate group (532), and the outer spherical tank contact surface (533). The cross-sectional area and length of the intermediate support (52) satisfy the strength conditions of the inner support structure (5) established according to the first strength theory. The number and thickness of the ribs of the first rib group (512) satisfy the strength conditions of the upper support (51) established according to the first strength theory. The number and thickness of the ribs of the second rib group (532) satisfy the strength conditions of the lower support (53) established according to the first strength theory.

3. The support structure as described in claim 2, characterized in that, The upper support (51), the middle support (52), and the lower support (53) are fixedly connected.

4. The support structure as described in claim 2, characterized in that, The upper support (51) is a stainless steel upper support, the lower support (53) is a stainless steel lower support, and the middle support (52) is a fiberglass solid support.

5. The support structure as described in claim 2, characterized in that, The first rib group (512) and the second rib group (532) are each composed of a plurality of short ribs and a long rib. The plurality of short ribs are parallel to each other and are all perpendicular to the long rib. The long rib intersects the midpoint of the short ribs at the edge. The first support surface (513) and the second support surface (531) are two identical cuboids.

6. The support structure as described in claim 1, characterized in that, The inner spherical tank contact surface (511) is a curved surface with the same curvature as the inner spherical tank (3), and the outer spherical tank contact surface (533) is a curved surface with the same curvature as the outer spherical tank (2).

7. The support structure as described in claim 1, characterized in that, The outer support structure (6) is a skirt structure. The bottom of the outer support structure (6) is fixed to the ground surface by bolts, and the top is tangentially connected to the equator of the side of the outer spherical tank (2).

8. A double-walled spherical tank, characterized in that, The supporting structure described in any one of claims 1 to 7 further includes: an outer spherical tank (2), an inner spherical tank (3), and a sandwich insulation material (4). The inner spherical tank (3) is placed inside the cavity of the outer spherical tank (2) by an inner support structure (5); The interlayer insulation material (4) is filled between the outer spherical tank (2) and the inner spherical tank (3); The outer spherical tank (2) is supported on the ground by the outer support structure (6).

9. The double-walled spherical tank as described in claim 8, characterized in that, The top of the outer spherical tank (2) of the double-layer spherical tank is provided with a dome (1) that communicates with the inner spherical tank (3). The dome (1) is used to realize loading and unloading and to support and stabilize the inner spherical tank (3).

10. The double-walled spherical tank as described in claim 8, characterized in that, The inner spherical tank (3) is a 304 stainless steel inner tank, and the outer spherical tank (2) is a cast steel outer tank.

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