Assembling method of double-layer spherical tank

Abstract

The invention provides an assembling method of a double-layer spherical tank, which comprises the following steps of: firstly installing plates of an outer ball except an outer ball lower pole middle plate and an outer ball upper shell, then installing an inner ball and a thermal insulation material arranged between the inner ball and the outer ball, and then installing the outer ball upper shell and the outer ball lower pole middle plate to form the double-layer spherical tank, so that the outer ball and the inner ball are combined and assembled; the hoisting difficulty is reduced. Before the thermal insulation material is laid on the outer surface of the inner ball, the clean room and the humidity adjusting device are firstly built, and the humidity of the clean room is controlled through the humidity adjusting device, so that the position where the thermal insulation material is installed is dry, and the thermal insulation material is prevented from absorbing water in the installation process; the spherical tank is integrally heated when the inner ball and the outer ball are arranged and the interlayer between the inner ball and the outer ball is vacuumized, so that moisture and gas in the thermal insulation material and the adsorbent are quickly discharged and pumped out, the vacuum degree between the inner ball and the outer ball can be guaranteed for a long time, and the thermal insulation effect of the spherical tank is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of cryogenic liquid containers, and in particular to a method for assembling a double-walled spherical tank. Background Technology

[0002] While the technology for single-layer large spherical tanks is quite mature in China, there is little experience in constructing large double-layer spherical tanks. Double-layer spherical tanks have an inner and outer spherical structure, with the inner and outer tanks connected and assembled via a supporting structure. The process also involves installing process piping, insulation materials, and adsorption devices between the inner and outer tanks. Although the traditional "inner-to-outer, integrally nested" process for horizontal cryogenic storage tanks facilitates the installation of sandwich components, it requires a large construction area, has high hoisting requirements, and makes it difficult to guarantee the concentricity of the nested tanks. Summary of the Invention

[0003] The purpose of this invention is to provide a method for assembling a double-walled spherical tank that is easy to install and has low installation difficulty.

[0004] To solve the above-mentioned technical problems, the present invention provides a method for assembling a double-layered spherical tank, the double-layered spherical tank comprising an outer sphere and an inner sphere, the assembly method comprising: Assemble the plates other than the lower pole plate and the upper shell of the outer sphere to form the outer sphere support foundation; The inner sphere is installed within the outer sphere support base; A clean room and a humidity control device are provided; the outer sphere support base and the inner sphere are located in the clean room, and the humidity control device is installed inside the clean room; Turn on the humidity control device to adjust the indoor humidity of the clean room to the preset humidity, and lay insulation material on the upper surface of the inner sphere; Assemble the outer spherical upper shell and connect it to the outer spherical support foundation; Insulation material is laid on the lower surface of the inner sphere; Install the lower pole plate of the outer sphere. The lower pole plate of the outer sphere, the outer sphere support base, and the upper shell of the outer sphere form the outer sphere. A sandwich layer is formed between the outer sphere and the inner sphere. The entire spherical tank is heated to the first temperature, and the interlayer between the inner and outer spheres is evacuated. Install the external structure of the spherical tank, and remove the clean room and humidity control device; Storage tests were conducted on the spherical tank.

[0005] In some embodiments of this application, in the step of "setting up a clean room and a humidity control device", a temperature control device is also set up, and the temperature control device is set up inside the clean room; in the step of "starting the humidity control device to adjust the indoor humidity of the clean room to a preset humidity and laying thermal insulation material on the upper surface of the inner sphere", the temperature control device is also started to adjust the indoor temperature of the clean room to a second temperature.

[0006] In some embodiments of this application, the preset humidity is less than 50%; the second temperature is 20-30 degrees Celsius.

[0007] In some embodiments of this application, before the steps of "starting the humidity control device, adjusting the indoor humidity of the clean room to the preset humidity, and laying insulation material on the upper surface of the inner sphere", the method further includes cleaning and drying the outer surface of the inner sphere.

[0008] In some embodiments of this application, a heating device is also provided in the step of "setting up a clean room and a humidity control device", and the heating device is connected to the clean room; in the step of "heating the spherical tank as a whole to a first temperature and evacuating the interlayer between the inner and outer spheres", the specific steps include: starting the heating device to heat the temperature in the clean room to the first temperature and heating for a preset time; starting the vacuum pump to evacuate the interlayer between the inner and outer spheres to a preset air pressure value.

[0009] In some embodiments of this application, the step of "starting the heating device to heat the temperature inside the clean room to a first temperature and heating for a preset time" further includes: injecting hot air into the inner sphere to heat the inner sphere to the first temperature.

[0010] In some embodiments of this application, the first temperature is 80-120 degrees Celsius; the preset air pressure is 1.33 Pa-6.65 Pa.

[0011] In some embodiments of this application, before the step of "assembling the outer shell of the outer sphere", the method further includes: wrapping a sealing film around the outside of the insulation material; between the step of "assembling the outer shell of the outer sphere" and the step of "laying insulation material on the lower surface of the inner sphere", the method further includes: removing the support fixture used to support the inner sphere; adjusting the indoor humidity of the clean room to a preset humidity and removing the sealing film; before the step of "installing the lower electrode plate of the outer sphere", the method further includes: installing an adsorbent between the inner sphere and the outer sphere.

[0012] In some embodiments of this application, the thermal insulation material is configured in multiple pieces, which are distributed along the circumference of the inner sphere and cover the outer surface of the inner sphere; the thermal insulation material includes an insulation blanket and an aluminum film arranged sequentially.

[0013] In some embodiments of this application, the step of "assembling the plates of the outer sphere, excluding the lower pole plate and the upper shell of the outer sphere, to form the outer sphere support foundation" specifically includes: welding the legs to the equatorial plate of the outer sphere; hoisting the welded components of the legs and the outer equatorial plate and installing the tie rods between the legs; welding the equatorial plate of the outer sphere between two adjacent legs; hoisting and welding the lower pole side plate and the lower pole edge plate of the outer sphere to the lower end of the equatorial plate of the outer sphere to form the outer sphere support foundation; installing support fixtures for supporting the inner sphere inside the lower pole side plate and the lower pole edge plate of the outer sphere; and installing connecting plates inside the outer sphere.

[0014] In some embodiments of this application, the step of "installing the inner sphere within the outer sphere support foundation" specifically includes: assembling the lower pole plate, the equatorial plate, and the upper pole plate of the inner sphere to form the inner sphere, and hoisting the inner sphere onto the support fixture; or, assembling the lower pole plate, the equatorial plate, and the upper pole plate of the inner sphere on the support fixture, wherein the lower pole plate, the equatorial plate, and the upper pole plate of the inner sphere form the inner sphere; adjusting the position of the support fixture to adjust the concentricity of the inner sphere and the outer sphere support foundation; and installing a connector between the outer sphere support foundation and the inner sphere.

[0015] As can be seen from the above technical solution, the beneficial effects of the present invention are as follows: The assembly method of the double-layer spherical tank in this application involves first installing the outer sphere, excluding the lower pole plate and the upper shell of the outer sphere, to form the outer sphere support foundation. Then, the inner sphere and the insulation material placed between the inner and outer spheres are installed. Finally, the upper shell of the outer sphere and the lower pole plate of the outer sphere are installed to form the double-layer spherical tank. This method achieves the combined assembly of the outer and inner spheres, reduces the difficulty of hoisting, and facilitates the adjustment of the concentricity of the outer and inner spheres, thereby making the overall assembly of the double-layer spherical tank more convenient.

[0016] Before laying the insulation material on the outer surface of the inner sphere, a clean room and humidity control device are constructed. The clean room surrounds the outside of the spherical tank, and the humidity of the clean room is controlled by the humidity control device to keep the area where the insulation material is installed dry, preventing the insulation material from absorbing moisture during installation. In addition, when the space between the inner and outer spheres is evacuated, the entire spherical tank is heated so that the moisture and gas in the insulation material and adsorbent can be quickly discharged and extracted, thereby maintaining the vacuum between the inner and outer spheres for a long time and ensuring the insulation effect of the spherical tank. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a double-layered spherical tank in one embodiment.

[0018] Figure 2 This is a top view of the double-layered spherical tank after the external structure of the tank has been removed, according to one embodiment.

[0019] Figure 3 This is a schematic diagram of the front view structure of the outer sphere in one embodiment.

[0020] Figure 4 This is a schematic diagram of the outer sphere's structure from below in one embodiment.

[0021] Figure 5 This is a schematic diagram of the front view structure of the inner sphere in one embodiment.

[0022] Figure 6 This is a schematic diagram of the inner and outer spheres from below in one embodiment.

[0023] Figure 7 This is a schematic diagram of the connector in one embodiment.

[0024] Figure 8 This is a schematic diagram of the assembly process of a double-layered spherical tank in one embodiment.

[0025] The annotations in the attached figures are explained as follows: 1-Outer sphere; 11-Lower shell of the outer sphere; 111-Equatorial plate of the outer sphere; 112-Lower polar lateral plate of the outer sphere; 113-Lower polar side plate of the outer sphere; 114-Lower polar middle plate of the outer sphere; 12-Upper shell of the outer sphere; 121-Upper temperate plate of the outer sphere; 122-Upper polar plate of the outer sphere; 1221-Upper polar side plate of the outer sphere; 1222-Upper polar lateral plate of the outer sphere; 1223-Upper polar middle plate of the outer sphere; 2-Inner sphere; 21-Lower polar plate of the inner sphere; 211-Lower polar plate of the inner sphere Side plate; 212-Inner sphere lower pole side plate; 213-Inner sphere lower pole middle plate; 22-Inner sphere equatorial plate; 23-Inner sphere upper pole plate; 231-Inner sphere upper pole side plate; 232-Inner sphere upper pole side plate; 233-Inner sphere upper pole middle plate; 3-Connector; 31-Upper wing plate; 32-Upper pull rod; 33-Adjuster; 34-Lower pull rod; 35-Lower wing plate; 4-Leg; 5-Pull rod; 6-Interlayer; 7-Insulation material; 8-Adsorbent. Detailed Implementation

[0026] Typical embodiments embodying the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention can have various variations in different embodiments without departing from the scope of the present invention, and the descriptions and illustrations herein are for illustrative purposes only and not intended to limit the present invention.

[0027] In the description of this application, it should be understood that, in the embodiments shown in the accompanying drawings, the indications of direction or positional relationships (such as up, down, left, right, front, and back, etc.) 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. These descriptions are appropriate when these elements are in the positions shown in the accompanying drawings. If the positions of these elements change, these directional indications also change accordingly.

[0028] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0029] See Figure 1 and Figure 2 A double-walled spherical tank includes an outer sphere 1, an inner sphere 2, and a connector 3. The inner sphere 2 is installed inside the outer sphere 1 and is connected to the outer sphere 1 via the connector 3, thus fixing the inner sphere 2 inside the outer sphere 1. A sandwich layer 6 is formed between the inner sphere 2 and the outer sphere 1. Insulation material 7 is installed within the sandwich layer 6, specifically wrapping around the outer surface of the inner sphere 2 to improve its insulation effect.

[0030] See Figure 3 and Figure 4 The outer sphere 1 includes a lower outer sphere shell 11 and an upper outer sphere shell 12. The upper outer sphere shell 12 is installed above the lower outer sphere shell 11, and the upper outer sphere shell 12 and the lower outer sphere shell 11 together form an integral spherical shape.

[0031] The lower outer shell 11 includes an outer equatorial plate 111, an outer lower pole side plate 112, an outer lower pole edge plate 113, and an outer lower pole center plate 114. Multiple outer equatorial plates 111 are provided, forming a ring. The outer lower pole side plate 112, outer lower pole edge plate 113, and outer lower pole center plate 114 are sequentially arranged at the bottom of the ring formed by the multiple outer equatorial plates 111, such that the outer equatorial plate 111, outer lower pole side plate 112, outer lower pole edge plate 113, and outer lower pole center plate 114 form a hemispherical structure that is open at the top and closed at the bottom. Figure 3 and Figure 4 In the illustrated embodiment, four lower outer sphere edge plates 113 are provided. These four lower outer sphere edge plates 113 are located at the lower end of the outer sphere equatorial plate 111 and form a ring. The lower outer sphere middle plate 114 is located at the bottom of the lower outer sphere shell 11, and the lower outer sphere side plates 112 are located on both sides of the lower outer sphere middle plate 114. The lower outer sphere side plates 112, lower outer sphere edge plates 113, and lower outer sphere middle plate 114 together form the lower outer sphere electrode plate.

[0032] The outer spherical upper shell 12 includes an upper temperate plate 121 and an upper polar plate 122. Multiple upper temperate plates 121 are arranged, forming an annular structure. The lower end of this annular structure is connected to the upper end of the outer spherical lower shell 11, specifically to the end of the outer spherical equatorial plate 111 opposite to the lower polar plate 114. The upper polar plate 122 is connected to the upper end of the annular structure formed by the multiple upper temperate plates 121. The upper polar plate 122 is formed by splicing together multiple plates. For example: in... Figure 3 In the illustrated embodiment, the upper outer sphere plate 122 includes an upper outer sphere edge plate 1221, an upper outer sphere middle plate 1223, and an upper outer sphere side plate 1222. Four upper outer sphere edge plates 1221 are provided, arranged in a ring at the upper end of the temperate plate 121. The upper outer sphere middle plate 1223 is located at the highest position of the upper outer sphere shell 12, and the upper outer sphere side plates 1222 are located on both sides of the upper outer sphere middle plate 1223. The upper outer sphere edge plates 1221, middle plate 1223, and side plates 1222 are symmetrically arranged in the vertical direction with the lower outer sphere side plate 112, edge plate 113, and middle plate 114.

[0033] See Figure 5 and Figure 6 The inner sphere 2 includes a lower inner sphere plate 21, an equatorial inner sphere plate 22, and an upper inner sphere plate 23. Multiple equatorial inner sphere plates 22 are arranged in a ring. The upper inner sphere plate 23 and the lower inner sphere plate 21 are fixed to the upper and lower ends of the ring structure formed by the multiple equatorial inner sphere plates 22, respectively, thus forming a spherical structure. The lower inner sphere plate 21 can be formed by splicing multiple plates, and the upper inner sphere plate 23 can also be formed by splicing multiple plates. For example, see [reference needed]. Figure 5 and Figure 6 The inner sphere lower electrode plate 21 includes an inner sphere lower electrode side plate 211, an inner sphere lower electrode middle plate 213, and an inner sphere lower electrode side plate 212. Four inner sphere lower electrode side plates 211 are provided, positioned at the lower end of the inner sphere lower temperate plate and forming a ring. The inner sphere lower electrode middle plate 213 is located at the lowest position of the inner sphere lower shell, and the inner sphere lower electrode side plates 212 are located on both sides of the inner sphere lower electrode middle plate 213. The inner sphere upper electrode plate 23 includes an inner sphere upper electrode side plate 231, an inner sphere upper electrode middle plate 233, and an inner sphere upper electrode side plate 232. Four inner sphere upper electrode side plates 231 are provided, positioned at the upper end of the inner sphere upper temperate plate and forming a ring. The inner sphere upper electrode middle plate 233 is located at the highest position of the inner sphere upper shell, and the inner sphere upper electrode side plates 232 are located on both sides of the inner sphere upper electrode middle plate 233. The inner sphere upper pole side plate 231, inner sphere upper pole middle plate 233 and inner sphere upper pole side plate 232 are symmetrically arranged with the inner sphere lower pole side plate 212, inner sphere lower pole side plate 211 and inner sphere lower pole middle plate 213 in the vertical direction.

[0034] See Figure 7 The connector 3 is a tie rod structure. Multiple connectors 3 are configured and distributed along the outer circumference of the inner ball 2. One end of the connector 3 is fixedly connected to the outer surface of the inner ball 2, and the other end is fixedly connected to the inner wall of the outer ball 1, thereby suspending the inner ball 2 inside the outer ball 1.

[0035] In one embodiment, the connector 3 includes an upper wing plate 31, an upper pull rod 32, an adjuster 33, a lower pull rod 34, and a lower wing plate 35. The upper wing plate 31 is connected to the inner wall surface of the outer ball 1. The upper end of the upper pull rod 32 is connected to the upper wing plate 31, and the lower end of the upper pull rod 32 is connected to the adjuster 33. The lower wing plate 35 is connected to the outer wall surface of the inner ball 2. The lower end of the lower pull rod 34 is connected to the lower wing plate 35, and the upper end of the lower pull rod 34 is connected to the adjuster 33. Thus, the length of the connector 3 can be adjusted by the adjuster 33, thereby adjusting the position of the inner ball 2 inside the outer ball 1.

[0036] The upper wing plate 31 is rotatably connected to the inner wall of the outer sphere 1, and the lower wing plate 35 is rotatably connected to the outer wall of the inner sphere 2. Through the rotation between the upper wing plate 31 and the outer sphere, and between the lower wing plate 35 and the inner sphere, when the length of the connecting member 3 is adjusted by the adjuster 33, the connecting member 3 rotates relative to both the outer sphere 1 and the inner sphere 2 to compensate for horizontal displacement and absorb some of the expansion displacement of the inner sphere tank. It should be noted that the upper pull rod 32 and the lower pull rod 34 can be flexible components, such as steel cables, while the upper wing plate 31 and the outer sphere 1, and the lower wing plate 35 and the inner sphere 2, are fixedly connected.

[0037] The adjuster 33 can be a bolt and nut structure. That is, the adjuster 33 includes a bolt and a nut, which are connected to the upper pull rod 32 and the lower pull rod 34 respectively. By adjusting the mating position of the bolt and nut, the length of the connecting piece 3 can be adjusted.

[0038] In one embodiment, a connecting plate is welded inside the outer sphere 1, and one end of the connector 3 is connected to the connecting plate, thereby achieving the connection between the connector 3 and the outer sphere 1. A connecting seat is provided on the outer surface of the inner sphere 2, and the other end of the connector 3 is connected to the connecting seat, thereby achieving the connection between the connector 3 and the inner sphere 2.

[0039] See Figure 1 and Figure 2 In one embodiment, the connector 3 includes a first connector 301 and a second connector 302. The first connector 301 is disposed on a vertical plane, and the second connector 302 is disposed on a horizontal plane, so that the first connector 301 and the second connector 302 connect the inner ball 2 and the outer ball 1 from multiple directions, thereby improving the stability of the inner ball 2 after connection.

[0040] See Figure 1The double-walled spherical tank also includes support legs 4. The lower ends of the support legs 4 are fixed to the mounting foundation (such as a reinforced concrete structure), and the upper ends of the support legs 4 are connected to the outer spherical equatorial plates 111, thereby providing support for the outer sphere. In one embodiment, the number of support legs 4 is less than the number of outer spherical equatorial plates 111, and the upper ends of the support legs 4 are connected to the corresponding outer spherical equatorial plates 111. For example, there are 12 outer spherical equatorial plates 111, and 6 support legs 4 are provided, with the support legs 4 connected to two spaced-apart outer spherical equatorial plates 111. It should be noted that the number of support legs 4 can also be equal to the number of outer spherical equatorial plates 111.

[0041] The outrigger 4 is also connected to a tie rod 5, which connects two adjacent outriggers 4 to improve the load-bearing strength of the outrigger 4.

[0042] In some embodiments, an adsorbent 8 is further disposed in the interlayer between the inner sphere 2 and the outer sphere 1. The adsorbent 8 is used to absorb the gas in the interlayer 6 during the use of the spherical tank, so that the interlayer 6 is kept under vacuum and the heat insulation effect is improved. The adsorbent 8 includes one or more of Ag400 (silver-based molecular sieve adsorbent), PbO (lead oxide), and molecular sieves.

[0043] See Figure 8 A method for assembling a double-walled spherical tank, comprising: Step 1: Assemble the outer sphere 1, excluding the lower pole plate 114 and the upper shell 12, to form the outer sphere support base. In this embodiment, the support base includes the outer sphere equatorial plate 111, the outer sphere lower pole side plate 112, and the outer sphere lower pole edge plate 113. This step specifically includes: The support leg 4 is then welded to the outer spherical equatorial plate 111. Specifically, the plates used for welding to form the outer sphere 1 and inner sphere 2, and the support leg 4 for supporting the spherical tank, are transported to the construction site. Welding of the support leg 4 to the outer spherical equatorial plate 111 then begins, fixing the support leg 4 and the outer spherical equatorial plate 111 together. The plates used for welding to form the outer sphere 1 and inner sphere 2, and the support leg 4 for supporting the spherical tank, can be prefabricated in the factory, eliminating the need to transport the equipment to the construction site and reducing costs. Furthermore, prefabrication in the factory avoids the influence of external environmental factors (such as humidity) on the components, improving the quality of the manufactured components. It should be noted that the plates used for welding to form the outer sphere 1 and inner sphere 2 can also be produced on-site.

[0044] Furthermore, the welding process between the outrigger 4 and the outer spherical equatorial plate 111 is set before the process of installing the outrigger 4 on the installation foundation (such as a reinforced concrete structure), which facilitates the welding operation between the outrigger 4 and the outer spherical equatorial plate 111 and improves welding efficiency and welding quality.

[0045] The welded components of the support legs 4 and the outer spherical equatorial plate 111 are hoisted and the inter-support leg tie rods 5 are installed. Specifically, after the installation foundation for installing the spherical tank passes inspection, the welded components of the support legs 4 and the outer spherical equatorial plate 111 are hoisted into place, and the support legs 4 are fixedly connected to the installation foundation. The inter-support leg tie rods 5 are installed so that each support leg 4 is connected into a whole through the inter-support leg tie rods 5, thereby achieving effective support for the spherical tank and ensuring the positional accuracy of the upper end of the support legs 4, which facilitates the installation of other outer spherical equatorial plates 111 of the outer sphere 1.

[0046] The outer spherical equatorial plates 111 between two adjacent legs 4 are welded together. In this embodiment, the number of legs 4 is less than the number of outer spherical equatorial plates 111. Therefore, other outer spherical equatorial plates 111 connected to the legs 4 need to be welded together to form a closed structure. For example, there are 12 outer spherical equatorial plates 111 and 6 legs 4. The legs 4 are connected to two spaced-apart outer spherical equatorial plates 111. Therefore, another outer spherical equatorial plate 111 needs to be welded between the outer spherical equatorial plates 111 on two adjacent legs 4, so that all the outer spherical equatorial plates 111 form a closed ring structure after welding.

[0047] The lower pole side plate 112 and the lower pole edge plate 113 of the outer sphere are hoisted and welded to the lower end of the outer sphere equatorial plate 111 to form the outer sphere support foundation. The structure consisting of the outer sphere equatorial plate 111, the lower pole side plate 112, and the lower pole edge plate 113 is defined as the outer sphere support foundation. In this step, the lower pole side plate 112 and the lower pole edge plate 113 are welded to the lower end of the annular structure formed by all the outer sphere equatorial plates 111, and a position is reserved for installing the lower pole middle plate 114. The reserved position for installing the lower electrode plate 114 of the outer ball forms a channel. This channel is used for subsequent disassembly and assembly of the support fixture, disassembly and assembly of the sealing film wrapped around the insulation material 7, and installation of the pipe and absorbent 8 between the outer ball 1 and the inner ball 2, making subsequent operations more convenient. Moreover, the channel is located at the lowest point of the outer ball 1, which facilitates the discharge of debris inside the outer ball 1 under its own weight, ensuring the cleanliness of the inside of the outer ball 1. In this step, the welding of the lower electrode side plate 112 and the lower electrode edge plate 113 of the outer ball reduces the area of ​​the channel, thereby reducing the volume required for the support fixture and increasing the area of ​​the outer ball support base for connection with the inner ball 2 via the connector 3.

[0048] Support fixtures for supporting the inner sphere are installed inside the lower pole side plate 112 and the lower pole edge plate 113 of the outer sphere, and connecting plates are installed inside the outer sphere support base. Multiple connecting plates are welded to the equatorial plate 111 of the outer sphere, spaced apart on the inner wall of the outer sphere support base. These connecting plates are used to fix the connecting parts 3 to be installed later. The support fixture is ring-shaped and placed inside the outer sphere support base. The support fixture is used to pre-support the inner sphere 2 to ensure the center position of the inner sphere 2, facilitating the installation of the connecting parts 3. The support fixture is prefabricated to fit the dimensions of the interlayer 6 between the inner sphere 2 and the outer sphere 2, allowing the inner sphere 2 to be positioned after being hoisted onto the support fixture, reducing the difficulty of adjusting the center position of the inner sphere 2.

[0049] Step 2: Install the inner sphere 2 within the outer sphere support base. This step specifically includes: The inner sphere 2 is formed by welding and placed on the support fixture. In this step, the lower electrode plate 21, the equatorial plate 22, and the upper electrode plate 23 of the inner sphere can be welded to the outside of the outer sphere 1 to form the inner sphere 2, and then the inner sphere 2 is hoisted onto the support fixture; alternatively, the lower electrode plate 21, the equatorial plate 22, and the upper electrode plate 23 of the inner sphere can be hoisted sequentially to the support fixture on the outer sphere support base and then welded together to form the inner sphere 2.

[0050] After the inner ball 2 is welded together and placed on the support fixture, the inner ball 2 is lifted by a crane and the position of the support fixture is adjusted to adjust the concentricity of the inner ball 2 and the outer ball support foundation, that is, to adjust the concentricity of the inner ball 2 and the outer ball 1.

[0051] Next, a connector 3 is installed in the interlayer 6 between the outer spherical support base and the inner sphere 2. One end of the connector 3 is connected to the outer spherical support base, and the other end is connected to the inner sphere 2, so as to fix the inner sphere 2 inside the outer spherical support base.

[0052] Install a sandwiched pipeline. One end of the sandwiched pipeline is connected to the inner sphere 2 and communicates with the interior of the inner sphere 2, while the other end is connected to the outer sphere support base. This allows the interior of the inner sphere 2 to communicate with the exterior of the outer sphere support base through the sandwiched pipeline. Thus, the inner sphere 2 can be filled with liquid or gas from the outside of the outer sphere through the sandwiched pipeline, and the liquid or gas inside the inner sphere 2 can be discharged to the outside of the outer sphere 1.

[0053] After the inner ball 2 is installed, a leak test is performed on the inner ball 2.

[0054] Step 3: Install the cleanroom and humidity control device. The outer spherical support base and inner sphere 2 are located within the cleanroom, and the humidity control device is installed inside the cleanroom.

[0055] The cleanroom is larger than the design dimensions of the outer sphere 1, allowing the outer sphere support foundation to be completely located within the cleanroom. Furthermore, the top of the cleanroom is higher than the design height of the outer sphere 1, ensuring that the cleanroom does not interfere with the subsequent installation of the outer sphere upper shell 12. The top of the cleanroom can be opened and closed, allowing the assembly of the plates forming the outer sphere upper shell 12 to be hoisted to the outer sphere support foundation without obstructing the process.

[0056] A humidity control device is installed inside the cleanroom to control the humidity within the room. This device can be a dehumidifier or an air conditioner with dehumidification capabilities.

[0057] In some embodiments, in the step of "installing a humidity regulating device in the clean room so that the humidity in the clean room can be controlled by the humidity regulating device", a temperature regulating device is also installed in the clean room. The temperature regulating device is used to regulate the indoor temperature of the clean room. The temperature regulating device may be an air conditioner.

[0058] In some embodiments, in the step of "installing a humidity regulating device in a clean room so that the humidity in the clean room can be controlled by the humidity regulating device", a heating device is also provided. The heating device is connected to the clean room and is used to heat the outer sphere 1 and the inner sphere 2. The heating device can be a boiler, an electric heating device, or other heating structure.

[0059] Step 4: Activate the humidity control device to adjust the indoor humidity of the clean room to the preset humidity, and lay the insulation material 7 on the upper surface of the inner sphere 2. When laying the insulation material 7, since the outer sphere upper shell 12 has not yet been installed, there is a large space for construction personnel to operate the laying of the insulation material 7, making the laying of the insulation material 7 more convenient.

[0060] In this step, the indoor humidity of the cleanroom is adjusted to the preset humidity. Once the indoor humidity of the cleanroom reaches the required level, the insulation material 7 is laid on the upper surface of the inner sphere 2. This prevents the insulation material 7 from absorbing too much water due to excessive air humidity at the installation location, which would affect its insulation performance. The preset humidity is less than 50%. Other humidity values ​​are also acceptable.

[0061] In some embodiments, the temperature control device is activated simultaneously with the humidity control device to adjust the temperature and humidity inside the cleanroom. Once the indoor humidity of the cleanroom is adjusted to a preset humidity level and the indoor temperature is adjusted to a second temperature level, insulation material 7 is then laid on the upper surface of the inner sphere 2. The second temperature is preferably 20-30 degrees Celsius.

[0062] Since temperature affects the water molecule content in the air, and at the same humidity, the higher the temperature, the higher the water molecule content, adjusting the cleanroom's indoor temperature to the second temperature ensures a lower water molecule content. This prevents excessive moisture absorption by the insulation material 7 due to high humidity at the installation location, thus avoiding any negative impact on its insulation performance. Furthermore, adjusting the cleanroom's indoor temperature to the second temperature provides a comfortable working environment for construction workers, preventing their sweat from dripping onto the insulation material 7 and causing excessive moisture absorption, which would also affect its insulation performance.

[0063] When laying the insulation material 7 on the upper surface of the inner sphere 2, multiple pieces of insulation material 7 are arranged, distributed circumferentially around the inner sphere 2, and covering the outer surface of the inner sphere 2, so that the outer surface of the inner sphere 2 is completely covered by the insulation material 7. Pre-setting the insulation material 7 into multiple pieces reduces the volume and weight of each piece, facilitating handling and laying by construction workers. It should be noted that the insulation material 7 can also be a single piece, wrapped around the outer surface of the inner sphere 2. The thickness of the insulation material 7 is less than the width of the interlayer 6 between the inner sphere 2 and the outer sphere 1.

[0064] Each piece of insulation material 7 is shaped like a melon petal. After multiple pieces of insulation material 7 are spliced ​​together, they form a sphere and cover the outer surface of the inner sphere 2. This not only achieves precise adhesion between the insulation material 7 and the outer surface of the inner sphere 2, but also greatly reduces the number of local overlapping parts of the insulation material 7, reduces the amount of on-site wrapping work, and shortens the time required to install the insulation material 7.

[0065] The thermal insulation material 7 includes an insulation blanket and an aluminum film arranged in sequence. The insulation blanket and aluminum film can be arranged in multiple layers to improve the thermal insulation effect of the thermal insulation material 7.

[0066] In some embodiments, before laying the insulation material 7, the outer surface of the inner sphere 2 is cleaned to ensure that the insulation material 7 can completely adhere to the outer surface of the inner sphere 2, and to prevent other impurities from affecting the insulation effect on the insulation material 7 and the outer surface of the inner sphere 2. The cleaning process includes, but is not limited to, acid washing, cleaning, and drying.

[0067] After the insulation material 7 is laid, a sealing film is wrapped around the outside of the insulation material 7. The sealing film is waterproof and is used to prevent the insulation material 7 from absorbing moisture during the assembly of the outer spherical shell 12.

[0068] Step 5: Assemble the outer spherical upper shell 12 and connect it to the outer spherical support foundation. In this step, the top surface of the clean room is opened, and then the plates used for resist welding to form the outer spherical upper shell 12 are hoisted into the outer spherical support foundation and assembled and welded.

[0069] The outer spherical upper shell 12 includes an outer spherical upper temperate plate 121 and an outer spherical upper electrode plate 122. Multiple outer spherical upper temperate plates 121 are arranged, with the lower end of each plate welded to the upper end of the outer spherical lower shell 11 (i.e., the upper end of the outer spherical equatorial plate 111). The upper end of the outer spherical upper temperate plate 121 extends upwards, forming an annular structure. The outer spherical upper electrode plate 122 is welded to the upper end of the outer spherical upper temperate plate 121, thereby sealing the annular upper opening formed by the multiple outer spherical upper temperate plates 121 and thus sealing the insulation material 7 on the upper surface of the inner sphere 2.

[0070] The outer sphere upper electrode plate 122 can also be formed by splicing multiple plates. For example, the outer sphere upper electrode plate 122 includes an outer sphere upper electrode side plate 1222, an outer sphere upper electrode middle plate 1223, and an outer sphere upper electrode side plate 1221.

[0071] After the outer sphere upper shell 12 is installed, the support fixture and sealing membrane are removed. The removed support fixture and sealing membrane can be taken out from the channel used to install the lower pole plate 114 of the outer sphere. Since this channel is located at the bottom of the outer sphere 1, the support fixture and sealing membrane can slide out of the outer sphere 1 under their own gravity.

[0072] When dismantling the support fixture, since it is pressed down by the inner ball 2, it can be cut into multiple small fragments using a cutting machine, making it easier to remove from the interlayer 6. Alternatively, the support fixture can be removed first, followed by the sealing film, making it easier to remove the sealing film from the interlayer.

[0073] Step 6: Lay the insulation material 7 on the lower surface of the inner sphere 2. This solution places the insulation material 7 on the lower surface of the inner sphere 2 after the supporting fixtures are removed, ensuring that the laying of the insulation material 7 is not obstructed by the supporting fixtures, thus facilitating the laying and improving efficiency. Furthermore, it prevents the insulation material 7 from being scratched when the supporting fixtures are removed.

[0074] After laying the insulation material 7 on the lower surface of the inner sphere 2, an adsorbent 8 is installed in the interlayer 6 between the outer sphere 1 and the inner sphere 2 (outside the insulation material). The adsorbent 8 is used to absorb the gas in the interlayer 6 during the use of the spherical tank, so that the interlayer 6 is kept under vacuum, thereby improving the thermal insulation effect. The adsorbent 8 includes one or more of Ag400 (silver-based molecular sieve adsorbent), PbO (lead oxide), and molecular sieves. Both the plate and the insulation material 7 will release gas over time, which will increase the convective heat transfer between the inner sphere 2 and the outer sphere 1. Therefore, by placing the adsorbent 8 in the interlayer 6, these gases are adsorbed in the adsorbent 8, reducing convective heat transfer and improving the thermal insulation effect.

[0075] Step 7: Install the lower pole plate 114 of the outer sphere. The lower pole plate 114, the outer sphere support base, and the upper shell 12 of the outer sphere form the outer sphere. The outer sphere 1 is a closed structure. A sandwich layer 6 is formed between the outer sphere 1 and the inner sphere 2.

[0076] After the outer ball is installed on the lower pole plate 114, a leak test is performed on the outer ball.

[0077] After the outer sphere upper shell 12 is installed, or after the outer sphere lower pole plate 114 is installed, close the top of the cleanroom.

[0078] Step 8: Heat the entire spherical tank to the first temperature and evacuate the interlayer 6 between the inner sphere 2 and the outer sphere 1. In this step, the heating device is activated to heat the temperature inside the cleanroom to the first temperature for a preset time, so that the outer sphere 1, inner sphere 2, and the interlayer 6 between the inner sphere 2 and the outer sphere 1 reach the first temperature. This causes the water in the insulation material and adsorbent installed in the interlayer 6 to be heated and vaporized. Then, the interlayer 6 is evacuated to a preset pressure value by a vacuum pump, so that the water vapor and other gases in the interlayer 6 are extracted, improving the adsorption capacity of the adsorbent, reducing convective heat transfer between the outer sphere 1 and the inner sphere 2, and improving the thermal insulation effect.

[0079] Since the interlayer 6 requires a vacuum, it cannot be directly heated by introducing dry hot air. Therefore, in this solution, a heating device heats both the outer side of the outer sphere 1 and the inner sphere 2, transferring heat to the interlayer 6 and evaporating moisture from the insulation material and adsorbent within the interlayer 6. Specifically, the air outside the outer sphere 1 is heated to a first temperature, and hot air is injected into the inner sphere 2, heating it to the first temperature. This achieves heating from both the outer sphere 1 and the inner sphere 2, improving the heating efficiency and uniformity of the interlayer 6, and avoiding uneven heating caused by the insulation material inside the interlayer 6 when heating from one side. The hot air can be a high-temperature inert gas, such as nitrogen or helium.

[0080] When heating the spherical tank as a whole, continuous heating is required. The preset heating time is 1-2 months, which can be adjusted according to actual conditions (such as the volume of the spherical tank). The initial temperature is 80-120 degrees Celsius, and can be set to 100 degrees Celsius. Other temperatures are also acceptable.

[0081] When evacuating the interlayer 6 between the inner sphere 2 and the outer sphere 1, the vacuum pump can continuously evacuate the interlayer 6 during the overall heating process of the spherical tank, or it can evacuate the interlayer 6 multiple times during the overall heating process of the spherical tank. The preset pressure value is 1.33 Pa to 6.65 Pa. It should be noted that the preset pressure value can also be other pressure values.

[0082] Step 9: Install the external structure of the spherical tank and remove the cleanroom and humidity control system. The external structure of the spherical tank includes external piping, ladders, and platforms. When removing the cleanroom and humidity control system, the temperature control system and heating system will also be removed.

[0083] Step 10: Conduct a storage test on the spherical tank. This step includes pressure testing of the external pipelines and a cold-fill test on the spherical tank, as well as ensuring that the tank's quality meets safety requirements. During the cold-fill test, a set amount of liquid helium is injected into the inner sphere 2 and stored for a set time. Pressure changes during storage are monitored to determine if any leaks are present.

[0084] In some embodiments, the assembly method of the double-walled spherical tank also includes rust removal and paint spraying of the entire spherical tank to protect the outer surface of the spherical tank and prevent the spherical tank from being oxidized and corroded during use, thus affecting its service life.

[0085] In the above steps, step 3 can be moved before step 1, allowing construction workers to work under more comfortable temperatures when assembling the outer sphere's lower pole plate 114 and upper shell 12, and when installing the inner sphere within the outer sphere's support foundation. Alternatively, step 3 can be moved before step 2, allowing construction workers to work under more comfortable temperatures when installing the inner sphere within the outer sphere's support foundation. Step 9 can also be moved after step 10.

[0086] The double-layer spherical tank assembly method of this application involves first installing the outer sphere 1, excluding the lower pole plate 114 and the upper shell 12, to form the outer sphere support foundation. Then, the inner sphere 2 and the insulation material placed between the inner sphere 2 and the outer sphere 1 are installed. Finally, the upper shell 12 and the lower pole plate 114 are installed to form the double-layer spherical tank. This method achieves the combined assembly of the outer sphere 1 and the inner sphere 2, reducing the difficulty of hoisting and facilitating the adjustment of the concentricity of the outer sphere 1 and the inner sphere 2, thus making the overall assembly of the double-layer spherical tank more convenient. Combined with the new assembly process of zoned prefabrication and simultaneous construction of the two layers, it has significant advantages such as small construction footprint, convenient inner and outer sphere assembly process, easy precision adjustment, and low on-site support difficulty.

[0087] Before laying the insulation material on the outer surface of the inner sphere 2, a clean room and humidity control device are constructed. The clean room surrounds the outside of the spherical tank, and the humidity of the clean room is controlled by the humidity control device to keep the area where the insulation material is installed dry, preventing the insulation material from absorbing moisture during installation. In addition, when the interlayer 6 between the inner sphere 2 and the outer sphere 1 is evacuated, the entire spherical tank is heated so that the moisture and gas in the insulation material and adsorbent are quickly discharged and extracted, thereby ensuring that the vacuum between the inner sphere 2 and the outer sphere 1 can be maintained for a long time, thus ensuring the insulation effect of the spherical tank.

[0088] Although the invention has been described with reference to several typical embodiments, it should be understood that the terminology used is illustrative and exemplary, and not restrictive. Since the invention can be embodied in many forms without departing from the spirit or essence of the invention, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be interpreted broadly within the spirit and scope defined by the appended claims. Therefore, all variations and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. A method for assembling a double-walled spherical tank, the double-walled spherical tank comprising an outer sphere and an inner sphere, characterized in that, Assembly methods include: Assemble the plates other than the lower pole plate and the upper shell of the outer sphere to form the outer sphere support foundation; The inner sphere is installed within the outer sphere support base; A clean room and a humidity control device are provided; the outer sphere support base and the inner sphere are located in the clean room, and the humidity control device is installed inside the clean room; Turn on the humidity control device to adjust the indoor humidity of the clean room to the preset humidity, and lay insulation material on the upper surface of the inner sphere; Assemble the outer spherical upper shell and connect it to the outer spherical support foundation; Insulation material is laid on the lower surface of the inner sphere; An outer sphere lower pole plate is installed on the outer sphere support base. The outer sphere lower pole plate, the outer sphere support base, and the outer sphere upper shell form the outer sphere. A sandwich layer is formed between the outer sphere and the inner sphere. The entire spherical tank is heated to the first temperature, and the interlayer between the inner and outer spheres is evacuated. Install the external structure of the spherical tank, and remove the clean room and humidity control device; Storage tests were conducted on the spherical tank.

2. The assembly method of the double-walled spherical tank according to claim 1, characterized in that, In the step of "setting up a clean room and humidity control device", a temperature control device is also set up, which is located inside the clean room; In the step of "starting the humidity control device to adjust the indoor humidity of the clean room to the preset humidity and laying thermal insulation material on the upper surface of the inner sphere", the temperature control device is also started to adjust the indoor temperature of the clean room to the second temperature.

3. The assembly method of the double-walled spherical tank according to claim 2, characterized in that, The preset humidity is less than 50%; The second temperature is 20-30 degrees Celsius.

4. The assembly method of the double-walled spherical tank according to claim 1, characterized in that, Before the steps of "starting the humidity control device to adjust the indoor humidity of the clean room to the preset humidity and laying insulation material on the upper surface of the inner sphere", the process also includes cleaning and drying the outer surface of the inner sphere.

5. The assembly method of the double-walled spherical tank according to claim 1, characterized in that, In the step of "setting up a clean room and humidity control device", a heating device is also installed and connected to the clean room; The steps of "heating the entire spherical tank to a first temperature and evacuating the interlayer between the inner and outer spheres" specifically include: The heating device is activated to heat the temperature inside the clean room to a first temperature for a preset duration. Start the vacuum pump to evacuate the interlayer between the inner and outer spheres to the preset pressure value.

6. The assembly method of the double-walled spherical tank according to claim 5, characterized in that, The step of "starting the heating device to heat the temperature in the clean room to a first temperature and heating for a preset time" further includes: injecting hot air into the inner sphere to heat the inner sphere to the first temperature.

7. The assembly method of the double-walled spherical tank according to claim 5, characterized in that, The first temperature is 80-120 degrees Celsius; The preset air pressure is 1.33 Pa to 6.65 Pa.

8. The assembly method of the double-walled spherical tank according to claim 1, characterized in that, Before the step of "assembling the outer spherical shell", the following steps are also included: wrapping a sealing film around the outside of the insulation material; Between the steps of "assembling the outer shell of the sphere" and "laying insulation material on the lower surface of the inner sphere", the following steps are also included: removing the support fixtures used to support the inner sphere; adjusting the indoor humidity of the clean room to the preset humidity; and removing the sealing film. Before the step of "installing the lower electrode plate of the outer ball", the process also includes: installing an adsorbent between the inner ball and the outer ball.

9. The assembly method of the double-walled spherical tank according to claim 1, characterized in that, The thermal insulation material is provided in multiple pieces, which are distributed along the circumference of the inner sphere and cover the outer surface of the inner sphere; The insulation material includes an insulation blanket and an aluminum film arranged in sequence.

10. The assembly method of the double-walled spherical tank according to claim 1, characterized in that, The specific steps of "assembling the plates of the outer sphere, excluding the lower pole plate and the upper shell, to form the outer sphere support foundation" include: Welding the outriggers to the outer spherical equatorial plate; Hoist the welded components of the outriggers and outer equatorial plate, and install the tie rods between the outriggers; Welding the outer spherical equatorial plate between two adjacent legs; The lower pole side plate and the lower pole edge plate of the outer sphere are hoisted and welded to the lower end of the equatorial plate of the outer sphere to form the outer sphere support foundation; Supporting fixtures for supporting the inner ball are installed inside the lower pole side plate and the lower pole edge plate of the outer ball, and a connecting plate is installed inside the outer ball.

11. The assembly method of the double-walled spherical tank according to claim 10, characterized in that, The step of "installing the inner sphere within the outer sphere support base" specifically includes: Assemble the lower inner sphere plate, the equatorial inner sphere plate, and the upper inner sphere plate to form the inner sphere, and then hoist the inner sphere onto the support fixture; or, assemble the lower inner sphere plate, the equatorial inner sphere plate, and the upper inner sphere plate on the support fixture, and the lower inner sphere plate, the equatorial inner sphere plate, and the upper inner sphere plate form the inner sphere. Adjust the position of the support fixture to adjust the concentricity of the inner and outer spheres supporting the foundation; Install connectors between the outer sphere support base and the inner sphere.

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