Winding and sleeving method of liquid hydrogen storage tank

Abstract

The invention discloses a winding and sleeving method of a liquid hydrogen storage tank, which comprises the following steps of: fixing an inner container on a rotatable winding tool, rotating at a constant speed, winding a plurality of layers of heat insulation materials layer by layer, and synchronously sewing. Hoisting the inner container after winding, and mounting movable wheels on a bearing support at the bottom of the inner container; a guide rail is laid in the shell, and the inner container is horizontally hoisted to the starting end of the guide rail. The movable wheels slide along the guide rails, the inner container is horizontally moved into the shell, and hoisting points are alternately switched in the process so that the movable wheels can be disassembled in a segmented mode. The bearing support is used for supporting the inner container, and the concentricity of the inner container and the shell is adjusted; after the inner container is fixed, two ends of the shell are sealed and air tightness detection is performed. Introducing dry nitrogen into the inner container to replace moisture and air; and after the replacement is completed, vacuumizing to a set vacuum degree to complete the assembly. According to the method, nondestructive winding and assembling of the multi-layer heat insulation material are achieved, the large-volume storage tank manufacturing problem is solved, weld joints and material exposure time are shortened, and the storage tank quality and production efficiency are improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of liquid hydrogen tank manufacturing, and particularly relates to a winding and sleeving method of a liquid hydrogen tank. BACKGROUND

[0002] In the field of low-temperature storage and transportation, high-vacuum multilayer insulation technology is widely used in the insulation system of liquid hydrogen tanks due to its excellent heat insulation performance. Multilayer insulation material is usually composed of aluminum foil and glass fiber paper. The aluminum foil effectively blocks radiation heat transfer due to its low emissivity, and the glass fiber paper suppresses convection and conduction heat transfer by utilizing its porous structure. The combination of the two can improve the heat insulation performance to several times that of traditional insulation materials, meeting the stringent low-temperature storage requirements of liquid hydrogen (boiling point -252.8℃).

[0003] However, the existing manufacturing process faces significant challenges in the production of large-volume tanks. In the winding process, small-volume tank manufacturing often relies on special rotating winding tools, which can achieve precise tension control and uniform laying. However, due to the size limit, small tools are difficult to adapt to large-volume tanks, and the development cycle of custom large-scale special equipment is long. In the non-batch production mode, the high purchase and maintenance costs of the equipment conflict with the low usage frequency, making it difficult for most enterprises to bear. In terms of sleeving process, although the conventional crane hoisting and sleeving method is simple to operate, it requires the insulation material to have high damage resistance. The characteristics of aluminum foil being prone to wrinkling and glass fiber paper being brittle and fragile make it easily damaged in hoisting friction and collision, damaging the integrity of the insulation layer. The segmented sleeving scheme disassembles the shell into multiple segments to sleeve the insulation layer, which can reduce the difficulty of single operation, but the increased shell welding process not only prolongs the production cycle, but also significantly increases the exposure time of multilayer insulation materials in the air, causing a large amount of adsorption of moisture and impurities in the environment, resulting in a decrease in the subsequent vacuum replacement efficiency and an exponential increase in the difficulty of vacuum pumping, which seriously affects the vacuum life and insulation performance of the tank. Therefore, these technical bottlenecks restrict the large-scale production and application of large-volume high-vacuum multilayer insulation liquid hydrogen tanks. SUMMARY

[0004] The purpose of the present application is to provide a winding and sleeving method for a liquid hydrogen tank. The present application can realize the lossless winding and assembly of multilayer insulation materials, solve the manufacturing problems of large-volume tanks, reduce the welding seam and material exposure time, and replace the traditional oven with nitrogen replacement to improve the quality and production efficiency of the tank.

[0005] The technical solution of the present application is a winding and sleeving method for a liquid hydrogen tank, comprising the following steps: Step 1: In a clean environment, fix the inner container on a rotatable winding tool, drive the inner container to rotate at a uniform speed, and wind the multilayer insulation material while simultaneously sewing; Step 2, after winding is completed, hoist the inner container and install the moving wheels on the load-bearing support at the bottom of the inner container; Step 3, lay the guide rail inside the shell, and hoist the inner container horizontally to the starting end of the guide rail; Step 4, slide the moving wheels along the guide rail to move the inner container horizontally into the shell, and alternately switch the hoisting points during the moving process to remove the moving wheels in sections; Step 5, support the inner container with the load-bearing support, and adjust the concentricity of the inner container and the shell by the radial positioning tool; Step 6, after the inner container is fixed, seal the two ends of the shell and conduct the air tightness test; Step 7, introduce dry nitrogen into the inner container, and heat the outer surface of the shell to make the nitrogen in the interlayer circulate to replace moisture and air; Step 8, after the replacement is completed, vacuumize to the set vacuum degree to complete the manufacturing and assembly of the liquid hydrogen storage tank.

[0006] The winding and assembling method of the liquid hydrogen storage tank described above, in step 1, the humidity of the clean environment is controlled below 50%; the thermal insulation material is a combination of aluminum foil and glass fiber paper.

[0007] The winding and assembling method of the liquid hydrogen storage tank described above, the winding tool includes a winding drum, a standard roller frame, a permanent connection tool and an intermediate lifting lug; wherein the standard roller frame is symmetrically arranged below the two ends of the inner container to support the inner container, the winding drum is parallelly arranged on one side of the inner container and maintains a preset distance with the inner container, and the permanent connection tool is fixed to the end of the inner container and forms a transmission connection with the winding drum; the intermediate lifting lug is arranged at the connection position of the head and the cylinder body at the two ends of the inner container, and the hoisting axis of the intermediate lifting lug is parallel to the axis of the inner container.

[0008] The winding and assembling method of the liquid hydrogen storage tank described above, in step 2, the assembling lifting lug is used for hoisting, and the assembling lifting lug is symmetrically arranged at the middle position of the outer surface of the inner container.

[0009] The winding and assembling method of the liquid hydrogen storage tank described above, in step 3, the guide rail is laid along the axial direction of the shell, limit blocks are arranged on the guide rail, and a support plate is arranged on one side of the guide rail.

[0010] The winding and assembling method of the liquid hydrogen storage tank described above, in step 4, the alternately switched hoisting points use the intermediate lifting lug; when the inner container is moved into the shell and the intermediate lifting lug passes out of the shell port, the intermediate lifting lug is used as the stress point for subsequent hoisting and removal of the moving wheels.

[0011] In step 5 of the winding and sleeving method of the liquid hydrogen storage tank, the load-bearing supports are arranged on the inner bottom of the shell and symmetrically distributed along the axial direction of the shell, and the top of the load-bearing supports is matched with the supporting parts on the outer surface of the inner container; after the removal of the moving wheels and the guide rails, the load-bearing supports bear the weight of the inner container, and realize the front and rear positioning and stable support of the inner container.

[0012] In step 5 of the winding and sleeving method of the liquid hydrogen storage tank, the radial positioning tool is arranged on the inner wall of the shell; the outer surface of the inner container is provided with radial support points; during positioning, the radial positioning tool and the radial support points are in contact to form rigid limiting, so as to ensure the coaxiality of the inner container and the shell.

[0013] In step 6 of the winding and sleeving method of the liquid hydrogen storage tank, flanges are used for sealing the two ends of the shell, metal winding gaskets are arranged on the sealing surfaces of the flanges, and the helium mass spectrometry leak detection method is used for the air tightness detection.

[0014] In step 7 of the winding and sleeving method of the liquid hydrogen storage tank, dry circulating nitrogen is introduced into the inner container, and the temperature of the nitrogen is set to be higher than 120 DEG C.

[0015] Compared with the prior art, the present application realizes the lossless winding of the heat insulation material of the storage tank with different volumes through the lossless rapid winding process of the multi-layer heat insulation material, avoids the aluminum foil wrinkles and the glass fiber paper breakage, guarantees the heat preservation performance, and does not need to purchase expensive large special equipment, but only needs to modify the existing equipment, so that the equipment investment cost is reduced. Through the lossless horizontal assembly process, the present application realizes the rapid lossless sleeving of the vertical and horizontal storage tanks with different sizes, the sleeving time is greatly shortened, the number of welding seams of the shell is reduced, the exposure time of the heat insulation material is shortened, the welding risk and water vapor impurity adsorption are reduced, and the vacuum performance is guaranteed. Through the nitrogen replacement process, the present application replaces the traditional drying room, breaks through the size limitation, avoids the damage of the heat insulation material in the transfer process, eliminates the high-temperature safety hazard and the secondary moisture absorption problem, ensures the long-lasting dry effect, and improves the manufacturing quality and production efficiency of the liquid hydrogen storage tank. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a schematic diagram of the lossless rapid winding tool structure; Figure 2 is an enlarged schematic diagram of the lossless rapid winding tool; Figure 3 is a schematic diagram of the sleeving and hoisting points; Figure 4 is a schematic diagram of the sleeving tool position; Figure 5 is a schematic diagram of the track; Figure 6 is a schematic diagram of the movement of the sleeving tool; Figure 7 is an enlarged schematic diagram of the sleeving tool. Figure 8 It is a schematic diagram of radial positioning tooling; Figure 9 is a reference symbol in the nitrogen replacement schematic diagram.

[0017] Reference numerals 1. Winding drum; 2. Inner container; 3. Standard roller frame; 4. Permanent connection tooling; 5. Intermediate lifting eye; 6. Set lifting eye; 7. Load-bearing support; 8. Moving wheel; 9. Guide rail; 10. Limit block; 11. Support plate; 12. Radial support point; 13. Radial positioning tooling; 14. External heating device; 15. Nitrogen storage tank; 16. Circulation fan; 17. Electric heater. DETAILED DESCRIPTION

[0018] The present invention will be further described below with reference to the accompanying drawings and examples, but they are not intended to limit the present invention.

[0019] Example 1: A method for wrapping a liquid hydrogen storage tank, comprising the following steps: Step 1: In a clean environment, fix the inner container 2 on a rotatable winding tool, drive the inner container 2 to rotate at a constant speed, wrap multiple layers of insulation material and sew them synchronously; In this step, if Figures 1-3 As shown, the winding tooling includes a winding drum 1, a standard roller frame 3, a permanent connection tooling 4, and an intermediate lifting lug 5. The standard roller frame 3 is symmetrically positioned below both ends of the inner container 2 to support the inner container 2. The winding drum 1 is positioned parallel to one side of the inner container 2 and maintains a preset spacing from the inner container 2 (e.g., 50-100 mm, which can be adjusted according to the thickness of the insulation material). The permanent connection tooling 4 is fixed to the end of the inner container 2 and forms a transmission connection with the winding drum 1. The intermediate lifting lug 5 is positioned at the connection between the end cap and the barrel of the inner container 2, with the lifting axis of the intermediate lifting lug 5 parallel to the axis of the inner container 2. After combining the inner container 2 with the winding tooling, the inner container 2 is slowly rotated to thoroughly clean its outer surface of grease, impurities, and moisture. Then, in a clean environment, the humidity is maintained below 50%. The multi-layer insulation material, a combination of aluminum foil and fiberglass paper, is prepared for winding. The inner container 2 is then slowly rotated, and the insulation material is wound layer by layer, sewn layer by layer to ensure uniform distribution of the insulation material. In this embodiment, the overlap width of each layer of aluminum foil and glass fiber paper is 50-80 mm, the suture line is made of glass fiber line, and the suture spacing is 150-200 mm.

[0020] The step is a non-destructive and fast winding process, which has the advantage of breaking the limitation of conventional process mainly suitable for small volume containers. The process can be used for winding whether small or large containers. Moreover, without purchasing new and expensive large special equipment, the manufacturing demand of the new process can be met by modifying or adjusting the existing relatively simple equipment in the factory, which significantly reduces the initial investment threshold. The core of the step process is that the size of the key components can be adjusted, which is crucial for winding large volume containers. By accurately adjusting the key size, the winding process can be optimized, effectively dispersing and reducing the stress of the local area of the container during winding, and finally ensuring that the local stress of the container after winding and during use does not exceed the material allowable limit, protecting the structural integrity of the container and avoiding premature failure or body damage due to excessive local stress, which is the core contribution of the process in safety.

[0021] Step 2, after winding is completed, remove the bolts between the winding roller 1 and the intermediate lifting lug 5, and use the sleeved lifting lug 6 to hoist the inner container 2, as shown in Figure 3 The sleeved lifting lug 6 is symmetrically arranged at the middle position of the outer surface of the inner container 2, and a standard lifting ring nut is installed. Two traveling cranes are used to lift the entire inner container 2, and a plurality of groups of movable wheels 8 are installed on the load-bearing support 7 at the bottom of the inner container 2, as shown in Figure 4 .

[0022] Step 3, lay the guide rail 9 inside the shell, and horizontally hoist the inner container 2 to the starting end of the guide rail 9; as shown in Figures 5-7 The guide rail 9 is laid along the axis direction of the shell, and a limiting block 10 is arranged on the guide rail 9. A support plate 11 is arranged on one side of the guide rail 9, which is used for the installation of the guide rail 9 and the shell. The distance between the top surface of the guide rail 9 and the inner wall of the bottom of the shell is 200-300 mm.

[0023] Step 4, hoist the inner container 2 for sleeving, slowly move the inner container 2, so that the first group of movable wheels 8 contacts the guide rail 9, then pause the movement, remove the connection between the lifting ring nut closest to the shell and the sleeved lifting lug 6, and move the first traveling crane away. Then, the front traction and the slow movement of the second traveling crane slowly sleeve, when the intermediate lifting lug 5 passes out of the shell and the rear row of movable wheels 8 contacts the guide rail 9, the first traveling crane is re-hoisted on the intermediate lifting lug 5; remove the connection between the lifting ring nut of the second traveling crane and the sleeved lifting lug 6, move the second traveling crane to the rear end, and re-hoist it on the intermediate lifting lug 5. Slowly move the inner container 2 to adjust to the appropriate position, slightly lift the inner container 2 to facilitate the removal of the movable wheels 8; after the removal of the movable wheels 8, the fork truck is used to remove the guide rail 9.

[0024] Step 5, slowly adjust the position of the inner container 2, support the inner container 2 by the load-bearing support 7, and adjust the concentricity of the inner container 2 and the shell by the radial positioning tool 13; as shown in Figure 6 andFigure 7 As shown, the load-bearing support 7 is arranged on the inner bottom of the shell and symmetrically distributed along the axis direction of the shell, and the top thereof is adapted to the support part of the outer surface of the inner container. After the removal of the mobile wheels and guide rails, the load-bearing support 7 bears the weight of the inner container, thereby realizing the front and rear positioning and stable support of the inner container. Figure 8 As shown, the radial positioning tool 13 is arranged on the inner wall of the shell, and the outer surface of the inner container 2 is provided with a radial support point 12. During positioning, the radial positioning tool 13 and the radial support point 12 are in contact to form rigid limiting, thereby ensuring the coaxiality of the inner container 2 and the shell, and the error is not more than 0.5 mm.

[0025] After all the positioning is completed, the load-bearing support 7 supports the inner container, the radial positioning tool 13 is removed, and the two ends of the shell are sealed and subjected to air tightness detection. In this step, the flange connection is used for sealing the two ends of the shell, the metal winding gasket is arranged on the sealing surface of the flange, and the helium mass spectrometry leak detection method is used for air tightness detection.

[0026] In step 7, the inner container 2 is subjected to dry and clean circulating nitrogen for heating, the interlayer is subjected to dry and clean nitrogen for replacing moisture and air in the interlayer, and the outer surface of the shell is wound with an external heating device 14 for heating the shell. The inner and outer surfaces jointly act to heat the interlayer nitrogen, and the nitrogen temperature is required to be above 120°C, and the replacement is performed multiple times. In this step, as shown in the figure, the device for circulating nitrogen includes a nitrogen storage tank 15, a circulating fan 16 and an electric heater 17. The nitrogen storage tank 15 provides a nitrogen source, and the nitrogen gas flow above 120°C is formed through the circulating fan 16 and the electric heater 17. The external heating device 14 on the outer surface of the shell is a winding type electric heating belt, which is controlled by an electric control cabinet. The winding density of the electric heating belt is 5-8 turns per meter of the shell length, and the adhesion degree to the outer surface of the shell is not less than 90%. Figure 9

[0027] In step 8, after the replacement is completed, the vacuum is extracted to a set vacuum degree, and the manufacturing and assembly of the liquid hydrogen storage tank are completed.

[0028] In this embodiment, steps 2-6 are a non-destructive horizontal assembly process of a liquid hydrogen storage tank. Through the steps and tools designed with care, the assembly is realized by using the guide rail 9, and the efficiency is extremely high, and the whole process only needs about 1 hour. The process is accurate and reliable in positioning, can ensure zero damage to the multi-layer thermal insulation material, and especially solves the problem of horizontal container assembly. The process is widely applicable, and is suitable for vertical, horizontal and different sizes of containers. For large containers, the shell can be segmented, thereby significantly reducing the total number of welding seams, shortening the welding and sealing treatment time, reducing the damage risk of welding to the thermal insulation material, and further maximizing the protection of the thermal insulation performance due to the reduction of the exposure time of the thermal insulation material. Compared with the traditional traveling crane lifting, the process has more advantages in efficiency, non-destructiveness, applicability and protection of the thermal insulation performance. ​

[0029] In this embodiment, step 7 is a nitrogen replacement process. The core purpose of this process is to replace the traditional oven by thoroughly eliminating moisture in the multilayer insulation material and interlayer, ensuring and improving the vacuum insulation performance, and having significant advantages compared to the traditional oven: no need to build a special oven, saving cost and space, and not limited by the size of the container, with very wide applicability; can be operated in situ at the manufacturing or assembly station, avoiding damage to the multilayer insulation material caused by transporting the container; usually only needs to heat the nitrogen mildly during operation, the equipment does not need to be moved and additional operations, the temperature is safe and controllable; by continuously introducing dry and hot nitrogen to exhaust moisture, it can efficiently dehumidify, and after the replacement is completed, it can quickly connect to the subsequent sealing process, greatly reducing the time of the insulation material exposed to humid air, effectively preventing secondary moisture absorption, ensuring the dry effect is lasting, and the process integration is more optimal.

[0030] Embodiment 2: In this embodiment, according to the step flow of embodiment 1, taking the manufacturing and assembly of a 50m³ horizontal liquid hydrogen tank as an example, the specific steps are as follows: Step 1: Non-destructive winding of the inner container insulation material; Environmental preparation: The operation is carried out in a clean workshop, the environmental humidity is controlled to be 45% (≤50%) by a dehumidification system, and the temperature is maintained at 20-25°C to avoid moisture absorption of the insulation material.

[0031] Tool installation: Place the two ends of the inner container 2 (cylinder length 8m, diameter 2.5m) on the symmetrically arranged standard roller frame 3, the roller frame spacing is 6m, and ensure that the inner container is horizontally supported; weld the intermediate lifting lug 5 (total 2 groups, symmetrically distributed) at the connection part of the head and cylinder of the inner container 2, the lifting lug axis is parallel to the inner container axis; connect the end of the inner container 2 with the winding roller 1 through the permanent connection tool 4, the winding roller 1 is arranged on one side of the inner container with a distance of 80mm from the outer surface of the inner container, forming a transmission cooperation.

[0032] Winding operation: The combined insulation material of aluminum foil (thickness 0.05mm) and glass fiber paper (thickness 0.1mm) is used, taking "aluminum foil + glass fiber paper" as one layer, a total of 30 layers are wound; start the winding roller 1, drive the inner container 2 to rotate at a uniform speed of 5r / min, and wind the insulation material layer by layer, the lap width of each layer is 60mm (lapped along the rotation direction), at the same time, sew with glass fiber wire (diameter 0.5mm), the sewing pitch is 180mm, to ensure that there is no wrinkle and no damage between the layers.

[0033] Step 2: Inner container hoisting and mobile wheel installation; Hoisting preparation: remove the connection between the winding roller 1 and the inner container, symmetrically weld 2 sets of matching lifting lugs 6 (spacing 4m) on the middle part of the outer surface of the inner container, and install M30 standard lifting ring nuts.

[0034] Hoisting and wheel installation: Two 50t cranes are used to horizontally lift the inner container (lifting height 1.2m) through the sleeve lifting lug 6; 1 set of mobile wheels 8 with brakes (10t per set) is installed under each of the 4 sets of load-bearing supports 7 (symmetrically distributed along the axis) at the bottom of the inner container to ensure that the wheel track matches the subsequent guide rail.

[0035] Step 3: Shell guide rail laying and inner container positioning; Guide rail installation: Two parallel guide rails 9 (material Q345B, cross-sectional size 100mm x 100mm) are laid along the axis direction inside the shell (length 9m, diameter 2.8m); a limiting block 10 (height 50mm) is set every 2m on the guide rail to prevent the wheel from slipping off; the guide rail is fixed to the inner wall of the shell through a support plate 11 (thickness 10mm) to ensure that the top surface of the guide rail is 250mm away from the bottom of the shell.

[0036] Inner container positioning: The inner container is horizontally moved to the starting end of the guide rail by the crane, the mobile wheels 8 are aligned with the guide rail, and the inner container is slowly lowered onto the guide rail, and the crane is released.

[0037] Step 4: Inner container horizontal movement into the shell and wheel removal; Segmented movement: The inner container is pulled forward by a traction device (pulling force 5t) while the rear crane assists in pushing, allowing the inner container to move into the shell at a speed of 0.5m / min along the guide rail; when the front intermediate lifting lug 5 emerges from the shell port (exposed length 300mm), the movement is paused, the front crane is used to lift through the intermediate lifting lug 5, the lifting ring nut of the sleeve lifting lug 6 is removed, and the rear crane is moved away; continue to move the inner container, when the rear end intermediate lifting lug 5 emerges from the shell, use the rear crane to lift the rear end intermediate lifting lug 5, remove the front crane, and alternately switch the lifting point until the inner container is completely moved into the shell.

[0038] Wheel and guide rail removal: fine-tune the crane to lift the inner container by 50mm, and sequentially remove the 4 sets of mobile wheels 8; use a forklift to pull out the guide rail 9 from the shell, completing the track removal.

[0039] Step 5: Inner container positioning and concentricity adjustment; Load-bearing support: Slowly lower the inner container so that the 4 sets of load-bearing supports 7 fall onto the support seats inside the shell, achieving front and rear positioning (axial deviation ≤2mm).

[0040] Radial positioning: 8 sets of radial positioning tools 13 (uniformly distributed along the circumference) are welded to the inner wall of the shell, which contact the radial support points 12 (corresponding position welded boss) on the outer surface of the inner container; by adjusting the tightening bolts of the positioning tools (accuracy 0.02mm), the concentricity of the inner container and the shell is controlled within 0.3mm (detected by a laser centering instrument), and the positioning tools are locked after completion.

[0041] Step 6: Shell sealing and air tightness detection; Sealing operation: Low-temperature resistant metal winding gasket (material 316L, suitable temperature -269℃) was installed between the flange (diameter 2.8m) of the shell and the head of the inner container, and was fastened with M48 bolts, with a bolt pre-tightening force of 500N m.

[0042] Air tightness detection: A helium mass spectrometer leak detector was used to fill 0.2MPa helium into the interlayer between the shell and the inner container, and the leakage rate was detected to ensure that the leakage rate was ≤5×10 -10 Pa m³ / s, and after passing, the gas was released.

[0043] Step 7: Nitrogen replacement and interlayer drying; Equipment connection: Dry nitrogen (dew point ≤-40℃) was introduced into the inner container, and a circulation was formed through the nitrogen storage tank 15→circulating fan 16→electric heater 17 (heated to 130℃) with a flow rate of 20m³ / h; An electric heating band (power 2kW / m) was wound around the outer surface of the shell, 6 turns per meter of shell, with a fit degree of 95%, and the temperature was controlled by an electric control cabinet to maintain above 120℃.

[0044] Replacement operation: Nitrogen was continuously introduced for 3 hours to circulate nitrogen in the interlayer and replace moisture and air (the outlet gas of the interlayer was detected by a dew point instrument, and when the dew point was ≤-60℃, the operation was stopped).

[0045] Step 8: Vacuum pumping and assembly completion; The nitrogen valve was closed, and the interlayer was vacuum pumped by a vacuum unit (ultimate vacuum 1×10 -5 Pa), and the vacuum degree was stopped when it reached 5×10 -4 Pa, and the pressure was maintained for 24 hours, and the vacuum degree decreased by ≤1×10 -4 Pa, i.e. the manufacturing and assembly of the liquid hydrogen tank was completed.

[0046] In summary, the present application realizes the lossless winding of different volume storage tanks by the multi-layer thermal insulation material lossless fast winding process, avoids the aluminum foil folding and glass fiber paper breaking, guarantees the heat preservation performance, and does not need to purchase expensive large special equipment, but only needs to realize by reforming the existing equipment, reduces the equipment investment cost. The present application realizes the fast lossless sleeving of vertical and horizontal, different size storage tanks by the lossless horizontal assembly process, greatly shortens the sleeving time, reduces the total number of shell assembly welds, shortens the exposure time of thermal insulation material, reduces the welding risk and water vapor impurity adsorption, and guarantees the vacuum performance. The present application replaces the traditional drying room by the nitrogen replacement process, breaks through the size limit, avoids the damage of thermal insulation material in the transfer process, eliminates the high temperature safety hidden danger and secondary moisture absorption problem, ensures the long-lasting drying effect, and improves the manufacturing quality and production efficiency of the liquid hydrogen storage tank as a whole.

Claims

1. A winding and sheathing method for a liquid hydrogen storage tank, characterized in that: The following steps are involved: Step 1: In a clean environment, fix the inner container on a rotatable winding tool, drive the inner container to rotate at a constant speed, wrap multiple layers of insulation material and sew them synchronously; Step 2: After winding is completed, hoist the inner container and install moving wheels on the load-bearing supports at the bottom of the inner container; Step 3: Lay the guide rail inside the shell and hoist the inner container horizontally to the starting end of the guide rail; Step 4: Slide the moving wheels along the guide rails to move the inner container horizontally into the outer shell. During the movement, alternate the lifting points to remove the moving wheels in sections. Step 5: Use the load-bearing support to support the inner container, and adjust the concentricity of the inner container and the outer shell by using the radial positioning tool; Step 6: After fixing the inner container, seal both ends of the outer shell and perform airtightness test; Step 7: Dry nitrogen is introduced into the inner container while heating the outer surface of the outer shell to circulate the nitrogen in the interlayer to replace moisture and air; Step 8: After the replacement is completed, evacuate to the set vacuum degree to complete the manufacturing and assembly of the liquid hydrogen storage tank.

2. The method for winding and sheathing a liquid hydrogen storage tank according to claim 1, characterized in that: In step 1, the humidity of the clean environment is controlled below 50%; the insulation material is a combination of aluminum foil and glass fiber paper.

3. The winding and sheathing method of the liquid hydrogen storage tank according to claim 1, characterized in that: In step 1, the winding tooling includes a winding drum, a standard roller frame, a permanent connection tooling and an intermediate lifting lug; wherein, the standard roller frame is symmetrically arranged below the two ends of the inner container to support the inner container, the winding drum is arranged parallel to one side of the inner container and maintains a preset distance from the inner container, the permanent connection tooling is fixed to the end of the inner container and forms a transmission connection with the winding drum; the intermediate lifting lug is arranged at the connection between the head and the cylinder at both ends of the inner container, and the lifting axis of the intermediate lifting lug is kept parallel to the axis of the inner container.

4. The method for winding and sheathing a liquid hydrogen storage tank according to claim 1, characterized in that: In step 2, the lifting is performed using a set of lifting lugs, which are symmetrically arranged in the middle of the outer surface of the inner container.

5. The winding and sheathing method of a liquid hydrogen storage tank according to claim 1, characterized in that: In step 3, the guide rail is laid along the axis direction of the shell, a limit block is provided on the guide rail, and a support plate is provided on one side of the guide rail.

6. The winding and sheathing method of a liquid hydrogen storage tank according to claim 1, characterized in that: In step 4, the alternate lifting point uses the middle lifting lug; when the inner container is moved into the outer shell and the middle lifting lug passes through the outer shell port, the middle lifting lug is used as the force point for subsequent lifting and removal of the moving wheel.

7. The winding and sheathing method of a liquid hydrogen storage tank according to claim 1, characterized in that: In step 5, the load-bearing support is set at the bottom of the shell and symmetrically distributed along the axis of the shell. The top of the support is adapted to the support part of the outer surface of the container; after the moving wheels and guide rails are removed, the weight of the container is taken over to achieve the front and rear positioning and stable support of the container.

8. The method for winding and sheathing a liquid hydrogen storage tank according to claim 1, characterized in that: In step 5, the radial positioning tool is set on the inner wall of the shell; the outer surface of the inner container is provided with radial support points; during positioning, the radial positioning tool contacts the radial support points to form a rigid limit to ensure the coaxiality of the inner container and the outer shell.

9. The method for winding and sheathing a liquid hydrogen storage tank according to claim 1, characterized in that: In step 6, flange connections are used to seal both ends of the housing, metal spiral wound gaskets are set on the flange sealing surfaces, and the air tightness test is performed using a helium mass spectrometry leak detection method.

10. The method for winding and sheathing a liquid hydrogen storage tank according to claim 1, characterized in that: In step 7, dry circulating nitrogen is introduced into the inner container, and the nitrogen temperature is set to be above 120°C.

Images