Support structure and double-layered spherical tank

Abstract

The utility model provides a kind of support structure and double-layered spherical tank, including multiple inner support structures and outer support structure;Inner support structure is arranged between the inner spherical tank and outer spherical tank of double-layered spherical tank, multiple inner support structures are arranged on first plane, first plane is lower than the plane of inner spherical tank inner ball center, multiple inner support structures are evenly arranged along the circumference of inner spherical tank;Inner support structure includes with inner spherical tank non-fixed contact inner spherical tank contact surface, with outer spherical tank non-fixed contact outer spherical tank contact surface;Inner support structure can slide relative to inner spherical tank;The strength of inner support structure meets the strength condition of inner support structure established according to first strength theory;Outer support structure connects outer spherical tank, for supporting outer spherical tank on ground surface, support structure uses relatively simple structure, not only simple production and assembly, but also have good degree of freedom and heat insulation effect.

Description

Technical Field

[0001] This utility model relates to the field of storage tank technology, specifically to a support structure and a double-layer spherical tank. Background Technology

[0002] Liquid hydrogen, with its ultra-high volumetric energy density and zero carbon emissions, has become a core carrier for achieving the goal of "carbon neutrality." Therefore, large spherical tanks stand out in the aerospace, maritime, and civilian hydrogen energy fields due to their geometric advantages. Spherical tanks have the smallest surface area for the same volume, significantly reducing the risk of environmental heat leakage. Furthermore, the spherical shell has a uniform stress distribution and stronger pressure resistance, making it suitable for large-volume liquid hydrogen storage and breaking through the volume limitations of traditional steel storage tanks.

[0003] For double-walled large liquid hydrogen spherical tanks, sufficiently strong internal and external support structures are essential to ensure the stability of the inner and outer tanks. Meanwhile, liquid hydrogen spherical tanks are highly susceptible to heat leakage from the external environment; therefore, stacked insulation or vacuum insulation techniques are often used between the inner and outer tanks to reduce environmental heat leakage. However, the support structure is a major thermal bridge within the spherical tank, accounting for 30% of the total heat leakage through the internal support. Therefore, reducing the heat leakage of the internal support structure is a core issue in the development of double-walled large liquid hydrogen spherical tanks.

[0004] A Chinese patent with publication number CN116717718A discloses a cryogenic bimetallic liquid hydrogen spherical tank with an internal and external support system. It includes: a pile foundation fixed to the ground; an external support installed on the pile foundation; the external support fixed above the pile foundation; a connecting part at the bottom of the external support for connecting diagonal supports; the diagonal supports crossing each other and connecting to the external support column; a reinforcing ring on the outside of the outer spherical tank; an inner spherical tank located inside the outer spherical tank; the inner spherical tank being connected to the inner wall of the outer spherical tank by diagonal tie rods; the diagonal tie rods connecting the two spherical tanks in a ring-like manner, allowing the inner spherical tank to shrink and deform due to temperature changes; and a cold insulation system between the inner and outer spherical tanks. This invention solves the problems of internal support and tank shrinkage / deformation in liquid hydrogen spherical tanks, and ensures the safe and stable operation of the cryogenic liquid hydrogen storage equipment through the airtight system of the device.

[0005] However, the existing support structures of liquid hydrogen spherical tanks and the support system provided by CN116717718A are complex and have poor degrees of freedom, and cannot simultaneously achieve the characteristics of stability, high degree of freedom and low heat leakage. Utility Model Content

[0006] In view of the deficiencies in the prior art, the purpose of this utility model is to provide a support structure and a double-layer spherical tank.

[0007] A support structure according to the present invention includes: multiple inner support structures and an outer support structure; The inner support structure is disposed between the inner spherical tank and the outer spherical tank of the double-layer spherical tank, and the inner support structure is used to support the inner spherical tank inside the outer spherical tank; Multiple internal support structures are disposed on a first plane, which is lower than the plane passing through the center of the sphere inside the inner spherical tank, and the multiple internal support structures are evenly arranged along the circumference of the inner spherical tank. The inner support structure includes an inner spherical tank contact surface that is not in fixed contact with the inner spherical tank and an outer spherical tank contact surface that is not in fixed contact with the outer spherical tank; the inner support structure can slide up and down relative to the inner spherical tank. The strength of the internal support structure satisfies the strength condition of the internal support structure established according to the first strength theory; The external support structure connects the outer spherical tank to the ground surface and is used to support the outer spherical tank on the ground surface.

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

[0009] Preferably, the upper support, the intermediate support, 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 column is a fiberglass solid column.

[0011] Preferably, the first rib group and the second rib group 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, and the long rib intersects the midpoint of the edge of the short rib; The first support surface and the second support surface are two identical cuboids.

[0012] Preferably, the inner spherical tank contact surface is a rectangle with the same curvature as the inner spherical tank, and the outer spherical tank contact surface is a rectangle with the same curvature as the outer spherical tank.

[0013] Preferably, the outer support structure is a skirt structure, the bottom of the outer support structure 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.

[0014] According to the present invention, a double-layer spherical tank is provided, which adopts any of the above-described support structures and further includes: an outer spherical tank, an inner spherical tank, and a sandwich insulation material; The inner spherical tank is placed inside the cavity of the outer spherical tank by an internal support structure; The interlayer 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 external support structure.

[0015] Preferably, the top of the outer spherical tank of the double-layered spherical tank is provided with a dome that communicates with the inner spherical tank. The dome is used to support and stabilize the inner spherical tank and to enable loading and unloading.

[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 present invention has the following beneficial effects: 1. This utility model achieves surface contact between the support structure and the surface of the spherical tank through a support structure composed of supports tangent to the inner and outer spherical tanks and pillars connecting the two supports. The contact area is large, and the support structure has high support stability. The support structure is not in fixed contact with the inner and outer spherical tanks. When the liquid hydrogen spherical tank shrinks due to cold, the inner tank and the inner support structure can slide relative to each other to avoid stress concentration at the support structure inside the spherical tank. The support structure has a high degree of freedom. The strength of the inner support structure meets the strength conditions established according to the first strength theory. The strength of the inner support structure is at the minimum limit value, and the heat leakage of the inner support structure is small, thus improving the thermal insulation performance of the double-layer spherical tank. 2. This utility model has an integrated structure composed of the spherical tank contact surface, connecting rib plate group, support column support surface and intermediate support column structure, which is simple to install inside the inner and outer spherical tanks. Attached Figure Description

[0018] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 This is a schematic diagram illustrating the structure of the double-layer spherical tank, which is the main feature of this utility model. Figure 2 This is a structural diagram illustrating the main internal support structure of this utility model; Figure 3 This is a schematic diagram showing the distribution of the internal support structure of the double-layered spherical tank from a top view.

[0019] Reference numerals: 1. Dome; 2. Outer tank; 3. Inner tank; 4. Sandwich insulation material; 5. Internal support structure; 6. External 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 Implementation

[0020] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the present invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0021] like Figure 1 As shown, a support structure provided by this utility model includes: multiple inner support structures 5 and an outer support structure 6.

[0022] 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.

[0023] Multiple internal support structures 5 are set on the first plane. The internal support structures 5 are not fixedly matched with the inner spherical tank 3 and the outer spherical tank 2. Therefore, the plane position of the internal support structure 5 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. The multiple internal support structures 5 are evenly arranged along the circumference of the inner spherical tank 3.

[0024] 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 inner spherical tank contact surface 511 and the inner spherical tank 3, and the outer spherical tank contact surface 533 and the outer spherical tank 2 are engaged by a frictional surface contact method.

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

[0026] 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.

[0027] When the inner spherical tank 3 is in a normal state, the inner support structure 5 is evenly distributed around 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, and the outer spherical tank contact surface 533 of the inner support structure 5 is not in fixed contact with the outer spherical tank 2. 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, this utility model provides a support structure that employs a relatively simple structure, simplifying manufacturing and assembly while offering good flexibility and insulation.

[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] The specific embodiments of this utility model have been described above. It should be understood that this utility model 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 substantive content of this utility model. 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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