Novel low-temperature storage tank

Abstract

The invention relates to the technical field of low-temperature storage, in particular to a novel low-temperature storage tank which comprises an inner container and a shell, a heat insulation winding layer is arranged on the surface of the inner container, a closed interlayer space is formed between the inner container and the shell, a vacuum interlayer is formed in the interlayer space through a vacuumizing process, and a first heat exchanger is arranged in the vacuum interlayer. The input end and the output end of the first heat exchanger penetrate out of the shell, and an external low-temperature medium enters the vacuum interlayer through the first heat exchanger to absorb and take away heat of the vacuum interlayer so as to reduce the temperature of the vacuum interlayer. According to the low-temperature storage tank, the first heat exchanger is introduced, the vacuum interlayer is cooled through the external low-temperature medium, the temperature of the vacuum interlayer is remarkably reduced, and therefore heat exchange between the inner container and the external environment is reduced, and the heat preservation performance of the low-temperature storage tank is effectively improved through the design; and the low-temperature state of the low-temperature liquid in the inner container can be more efficiently maintained.

Description

Technical Field

[0001] The invention relates to the technical field of low-temperature storage, and in particular to a novel low-temperature storage tank. Background Art

[0002] With the rapid development of the economy and the scale of industrial production, the application of cryogenic liquids in the industrial field is increasing, and the demand for cryogenic liquid storage containers is also growing. At present, the commonly used cryogenic storage tanks mainly use vacuum powder insulation or high vacuum multi-layer insulation technology, which are effective for storing cryogenic liquids above -196°C. However, when faced with liquids with lower temperatures such as liquid hydrogen (boiling point -253°C) and liquid helium (boiling point -269°C), the thermal insulation performance of these traditional storage tanks is insufficient.

[0003] In China, in order to store media below -196°C, manufacturers generally adopt the method of increasing the number of layers of multi-layer insulation wrapping of the inner container. Usually, the standard number of multi-layer insulation layers for high vacuum insulation is 40 layers, but after exceeding this standard number of layers, the improvement effect of insulation performance becomes very limited, and the insulation performance curve tends to be flat. This means that the effect of reducing heat leakage by simply increasing the thickness of the insulation layer outside the inner container gradually weakens, and it is difficult to meet the insulation performance requirements for the storage of cryogenic liquids below -196°C. When the thermal insulation performance of the storage tank is insufficient, the cryogenic liquid may heat up and increase the pressure. Once the pressure limit of the tank design is exceeded, it will be discharged to the external environment through the safety valve. This discharge not only causes cost waste, but also may become a safety hazard if the medium is flammable and explosive. Therefore, the thermal insulation performance of the storage tank is crucial for the storage of cryogenic media, which directly affects the use effect and safety of end customers using cryogenic liquids. Summary of the invention

[0004] In view of the deficiencies of the prior art, the present invention provides a novel cryogenic storage tank, which aims to solve the problem that the prior art generally adopts the method of increasing the number of multi-layer insulation winding layers of the inner container, and the improvement effect of the insulation performance becomes very limited.

[0005] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a new type of low-temperature storage tank, comprising: an inner container and an outer shell, an insulating winding layer is arranged on the surface of the inner container, a closed interlayer space is formed between the inner container and the outer shell, the interlayer space adopts a vacuum extraction process to form a vacuum interlayer, a first heat exchanger is arranged in the vacuum interlayer, the input end and the output end of the first heat exchanger both pass through the outer shell, and an external low-temperature medium enters the vacuum interlayer through the first heat exchanger to absorb and take away the heat of the vacuum interlayer to reduce the temperature of the vacuum interlayer.

[0006] Furthermore, the first heat exchanger is spaced apart from the inner container.

[0007] Furthermore, it also includes a second heat exchanger, which is closely arranged on the outer surface of the shell, and the input end of the second heat exchanger is connected to the output end of the first heat exchanger, and the output end of the first heat exchanger can be optionally sealed.

[0008] Furthermore, a first monitoring system is provided at the output end of the first heat exchanger, and the first monitoring system monitors the temperature and pressure of the first heat exchanger. When the temperature and pressure of the first heat exchanger do not reach the preset values, the first monitoring system controls the output end of the first heat exchanger to be sealed. When the temperature and pressure of the first heat exchanger reach the preset values, the first monitoring system controls the output end of the first heat exchanger to be connected with the input end of the second heat exchanger.

[0009] Further, the first heat exchanger is a first coil.

[0010] Furthermore, the second heat exchanger is a second coil.

[0011] Furthermore, it also includes aluminum foil, which is wrapped around the surface of the inner container to form an insulating wrapping layer.

[0012] Furthermore, the cryogenic medium is liquid nitrogen.

[0013] Furthermore, the first monitoring system includes a temperature sensor and a pressure sensor arranged in the first heat exchanger leading to the first heat exchanger, and a valve arranged at the output end of the first heat exchanger.

[0014] Furthermore, a second monitoring system is provided at the output end of the second heat exchanger. The second monitoring system can selectively seal the output end of the second heat exchanger. The second monitoring system monitors the temperature and pressure of the second heat exchanger.

[0015] The novel cryogenic storage tank described in the present invention has the beneficial effect that by introducing a first heat exchanger and utilizing an external cryogenic medium to cool the vacuum interlayer, the temperature of the vacuum interlayer is significantly reduced, thereby reducing the heat exchange between the inner container and the external environment. This design effectively improves the thermal insulation performance of the cryogenic storage tank, enabling it to more efficiently maintain the low temperature state of the cryogenic liquid in the inner container. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a front view of the planar structure of an embodiment of the present invention;

[0017] Figure 2 is a top view of the planar structure of an embodiment of the present invention;

[0018] Figure 3 It is a plan view of a partial structure of an embodiment of the present invention.

[0019] Explanation of the accompanying drawings: 1. Inner container; 2. Insulation wrap layer; 3. Outer shell; 4. First coil; 41. Input end; 42. Output end; 43. First monitoring system; 5. Second coil; 51. Input end; 52. Output end; 53. Second monitoring system. DETAILED DESCRIPTION

[0020] Typical embodiments that embody 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 changes in different embodiments without departing from the scope of the present invention, and the descriptions and illustrations therein are essentially used for illustration purposes rather than for limiting the present invention.

[0021] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0022] In order to further illustrate the principle and structure of the present invention, preferred embodiments of the present invention are now described in detail with reference to the accompanying drawings.

[0023] like Figure 1-3 As shown, an embodiment of the present invention provides a new type of cryogenic storage tank, including: an inner container 1 and an outer shell 3, wherein the inner container 1 is used to store cryogenic liquids, such as liquid hydrogen, liquid helium, etc. The inner container 1 is arranged in the outer shell 3, and a closed interlayer space is formed between the inner container 1 and the outer shell 3, wherein a first heat exchanger is arranged in the interlayer space, and both the input end 41 and the output end 42 of the first heat exchanger pass through the outer shell 3, and the first heat exchanger is connected to an external cold source, and the low-temperature medium of the external cold source can enter the vacuum interlayer through the first heat exchanger to absorb and take away the heat of the vacuum interlayer, thereby reducing the temperature transfer of the inner container 1, and achieving the purpose of reducing the overall heat leakage of the cryogenic storage tank and improving the thermal insulation performance.

[0024] By introducing the first heat exchanger and using an external cryogenic medium to cool the vacuum interlayer, the temperature of the vacuum interlayer is significantly reduced, thereby reducing the heat exchange between the inner container 1 and the external environment. This design effectively improves the thermal insulation performance of the cryogenic storage tank, enabling it to more efficiently maintain the low temperature state of the cryogenic liquid in the inner container 1.

[0025] The external cold source described in the above text may be a liquid nitrogen source, and the low-temperature medium provided by the cold source is liquid nitrogen.

[0026] Furthermore, a heat insulating wrapping layer 2 is provided on the surface of the inner container 1. The heat insulating wrapping layer 2 can be formed by wrapping multiple layers of materials such as aluminum foil, etc., to further reduce the temperature of the inner container 1 from being transferred to the external environment.

[0027] Furthermore, the interlayer space can be formed into a vacuum interlayer through a vacuum process to reduce the heat exchange between the inner container 1 and the external environment; the process of vacuuming the interlayer space can be an existing vacuum process, and the specific details of the vacuum process are not repeated here.

[0028] Furthermore, the first heat exchanger is spaced apart from the inner container 1 to avoid direct contact between the two, thereby reducing the amount of heat transferred by heat conduction, which helps maintain the low temperature state of the cryogenic liquid in the inner container 1 and further improves the overall thermal insulation performance of the storage tank.

[0029] Furthermore, it also includes a second heat exchanger, which is closely arranged on the outer surface of the shell 3. The second heat exchanger can reduce the temperature of the surface of the shell 3 and reduce the heat transferred from the external environment to the vacuum interlayer through the shell 3, thereby further enhancing the cooling effect of the entire storage tank.

[0030] Specifically, the input end 51 of the second heat exchanger is connected to the output end 42 of the first heat exchanger. After the first heat exchanger absorbs and takes away the heat of the vacuum interlayer, the low-temperature nitrogen output from its output end 41 still has a certain cooling capacity. By introducing these low-temperature nitrogen into the second heat exchanger, the cooling capacity of these media can be further used to reduce the temperature of the surface of the shell 3, thereby reducing the heat transferred from the external environment to the vacuum interlayer through the shell 3, and the nitrogen heated by heat exchange is discharged to the outside through the output end 52 of the second heat exchanger.

[0031] Furthermore, it also includes a first monitoring system 43, which monitors the temperature and pressure changes of the first heat exchanger in real time, which is a key step to ensure the stability of the internal environment of the storage tank and safe operation. When the first monitoring system 43 detects that the temperature and pressure of the first heat exchanger have not reached the preset value, it will control the output end 42 of the first heat exchanger to remain sealed. This can prevent the insufficiently cooled medium from flowing out and affect the efficiency of the entire cooling system. When the temperature and pressure of the first heat exchanger reach the preset value, the first monitoring system 43 will automatically control the output end 42 of the first heat exchanger to be connected with the input end 51 of the second heat exchanger. This automated control process ensures the continuous flow and effective use of the cooling medium, and improves the operating efficiency and stability of the entire system.

[0032] Furthermore, the first monitoring system 43 includes a controller, a temperature sensor and a pressure sensor disposed in the first heat exchanger leading to the first heat exchanger, and a valve disposed at the output end 42 of the first heat exchanger, and the temperature sensor, the pressure sensor and the valve are all electrically connected to the controller.

[0033] Furthermore, the first heat exchanger and the second heat exchanger can be common heat exchangers. Preferably, the first heat exchanger and the second heat exchanger are coil-type heat exchangers, the coil-type heat exchanger corresponding to the first heat exchanger is the first coil 4, and the coil-type heat exchanger corresponding to the second heat exchanger is the second coil. Among them, the first coil 4 is a full-circular tube, which maximizes the contact surface with the vacuum interlayer and can better reduce the temperature of the vacuum interlayer. The second coil is a half tube, which maximizes the contact surface with the shell 3 and can better reduce the temperature of the shell 3.

[0034] Furthermore, a second monitoring system 53 is included. The second monitoring system 53 is arranged at the output end 52 of the second heat exchanger. The second monitoring system 53 can selectively seal the output end 52 of the second heat exchanger. The second monitoring system 53 monitors the temperature and pressure of the second heat exchanger. The components and operation mode of the second monitoring system 53 are the same as those of the first monitoring system 43, and the second monitoring system 53 will not be described in detail here.

[0035] The above description is only a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, any slight modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A new type of cryogenic storage tank, characterized in that: include: An inner container and an outer shell, an insulating wrapping layer is arranged on the surface of the inner container, a closed interlayer space is formed between the inner container and the outer shell, a vacuum interlayer is formed by a vacuuming process in the interlayer space, a first heat exchanger is arranged in the vacuum interlayer, the input end and the output end of the first heat exchanger both pass through the outer shell, an external low-temperature medium enters the vacuum interlayer through the first heat exchanger to absorb and take away the heat of the vacuum interlayer, so as to reduce the temperature of the vacuum interlayer.

2. The novel cryogenic storage tank according to claim 1 is characterized in that: The first heat exchanger is spaced apart from the inner container.

3. The novel cryogenic storage tank according to claim 2 is characterized in that: It also includes a second heat exchanger, which is closely arranged on the outer surface of the shell, and the input end of the second heat exchanger is connected to the output end of the first heat exchanger, and the output end of the first heat exchanger can be optionally sealed.

4. The novel cryogenic storage tank according to claim 3 is characterized in that: A first monitoring system is provided at the output end of the first heat exchanger, and the first monitoring system monitors the temperature and pressure of the first heat exchanger. When the temperature and pressure of the first heat exchanger do not reach the preset values, the first monitoring system controls the output end of the first heat exchanger to be sealed. When the temperature and pressure of the first heat exchanger reach the preset values, the first monitoring system controls the output end of the first heat exchanger to be connected with the input end of the second heat exchanger.

5. The novel cryogenic storage tank according to any one of claims 1 to 4, characterized in that: The first heat exchanger is a first coil.

6. The novel cryogenic storage tank according to claim 5 is characterized in that: The second heat exchanger is a second coil.

7. The novel cryogenic storage tank according to claim 1 is characterized in that: It also includes aluminum foil, which is wrapped around the surface of the inner container to form a heat insulating wrapping layer.

8. The novel cryogenic storage tank according to claim 1 is characterized in that: The cryogenic medium is liquid nitrogen.

9. The novel cryogenic storage tank according to claim 4 is characterized in that: The first monitoring system includes a temperature sensor and a pressure sensor disposed in the first heat exchanger leading to the first heat exchanger, and a valve disposed at the output end of the first heat exchanger.

10. The novel cryogenic storage tank according to claim 4, characterized in that: The output end of the second heat exchanger is provided with a second monitoring system, and the second monitoring system can selectively seal the output end of the second heat exchanger, and the second monitoring system monitors the temperature and pressure of the second heat exchanger.

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