A new low temperature storage tank

Abstract

The application relates to the field of low-temperature storage technology, and relates to a novel low-temperature storage tank which comprises an inner container and an outer shell, the surface of the inner container is provided with an adiabatic winding layer, a closed interlayer space is formed between the inner container and the outer shell, the interlayer space is formed into a vacuum interlayer by adopting a vacuumizing process, 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, 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 that the temperature of the vacuum interlayer is reduced; the temperature of the vacuum interlayer is obviously reduced by introducing the first heat exchanger and cooling the vacuum interlayer by using the external low-temperature medium, so that the 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, so that the low-temperature state of the low-temperature liquid in the inner container can be more efficiently maintained.

Description

Technical Field

[0001] The present invention relates to the field of low-temperature storage technology, 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, commonly used cryogenic storage tanks mainly use vacuum powder insulation or high vacuum multi-layer insulation technology, which is effective for storing cryogenic liquids with temperatures 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, to store media below -196°C, manufacturers generally increase the number of layers of insulation wrapped around the inner container. Typically, the standard number of layers for high-vacuum insulation is 40. However, exceeding this standard, the improvement in insulation performance becomes very limited, and the insulation performance curve flattens. This means that simply increasing the thickness of the outer insulation layer of the inner container to reduce heat leakage gradually diminishes, making it difficult to meet the insulation performance requirements for storing cryogenic liquids below -196°C. When the thermal insulation performance of a storage tank is insufficient, the cryogenic liquid may heat up and pressurize. Once the pressure limit of the tank is exceeded, it will be discharged to the outside environment through the safety valve. This discharge not only results in cost waste but also poses a safety hazard if the medium is flammable or explosive. Therefore, the thermal insulation performance of the storage tank is crucial for the storage of cryogenic media, directly impacting the user experience and safety of end-users who use cryogenic liquids. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the present invention provides a new type of low-temperature storage tank, which aims to solve the problem that the existing technology generally adopts the method of increasing the number of multi-layer insulation wrapping 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 solution: a new type of low-temperature storage tank, comprising: an inner container and an outer shell, an insulating wrapping layer is provided 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 provided in the vacuum interlayer, the input and output ends 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.

[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, which 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 to the input end of the second heat exchanger.

[0009] Furthermore, 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 a heat-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, and 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 following beneficial effects: 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 It 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 planar structural diagram of a part of the 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 embodying the features and advantages of the present invention are described in detail in the following description. It should be understood that the present invention is capable of various variations in different embodiments without departing from the scope of the present invention, and that the descriptions and illustrations herein are intended to be illustrative rather than limiting.

[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 orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply 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 limiting the present application. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present application, "multiple" means 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 will now be described in detail with reference to the accompanying drawings.

[0023] like Figure 1-3 As shown, an embodiment of the present invention provides a novel cryogenic storage tank, comprising: an inner container 1 and an outer shell 3. The inner container 1 is used to store cryogenic liquids, such as liquid hydrogen, liquid helium, etc. The inner container 1 is disposed within the outer shell 3, forming a closed interlayer space between the inner container 1 and the outer shell 3. A first heat exchanger is disposed within the interlayer space. The input end 41 and the output end 42 of the first heat exchanger both extend beyond the outer shell 3. The first heat exchanger is connected to an external cold source. The cryogenic medium of the external cold source can enter the vacuum interlayer through the first heat exchanger to absorb and remove heat from the vacuum interlayer, thereby reducing the temperature transfer of the inner container 1, thereby 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 low-temperature 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 mentioned above 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. This 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 removes heat from the vacuum interlayer, the low-temperature nitrogen gas output from its output end 41 still has a certain cooling capacity. By introducing this low-temperature nitrogen gas into the second heat exchanger, the cooling capacity of this medium can be further utilized to reduce the surface temperature of the outer shell 3, thereby reducing the amount of heat transferred from the external environment to the vacuum interlayer through the outer shell 3. The nitrogen gas, which has been heated through 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. This 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. Doing so can prevent the outflow of insufficiently cooled medium 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 utilization 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. The temperature sensor, pressure sensor and valve are all electrically connected to the controller.

[0033] Furthermore, the first and second heat exchangers can be conventional heat exchangers. Preferably, the first and second heat exchangers are coil-type heat exchangers, with the first coil 4 corresponding to the first heat exchanger and the second coil 4 corresponding to the second heat exchanger. The first coil 4 is a full-circular tube, maximizing its contact surface with the vacuum interlayer and thus further reducing the temperature of the vacuum interlayer. The second coil is a half-tube tube, maximizing its contact surface with the outer shell 3 and thus further reducing the temperature of the outer shell 3.

[0034] Furthermore, a second monitoring system 53 is included. The second monitoring system 53 is disposed at the output end 52 of the second heat exchanger. The second monitoring system 53 can optionally 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 of the second monitoring system 53 are the same as those of the first monitoring system 43, and therefore, the second monitoring system 53 is not described in detail here.

[0035] The above description is merely a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, any minor 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, wherein a heat-insulating wrapping layer is provided on the surface of the inner container, and a closed interlayer space is formed between the inner container and the outer shell. The interlayer space adopts a vacuum process to form a vacuum interlayer, and a first heat exchanger is provided in the vacuum interlayer. The input end and the output end of the first heat exchanger both pass through the outer shell. The external low-temperature medium enters the vacuum interlayer through the first heat exchanger to absorb and take away the heat of the vacuum interlayer, thereby reducing the temperature of the vacuum interlayer; The first heat exchanger is spaced apart from the inner container; The second heat exchanger is closely arranged on the outer surface of the shell, 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 is optionally sealed; A first monitoring system is provided at the output end of the first heat exchanger. 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 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 to the input end of the second heat exchanger. The output end of the second heat exchanger is provided with a second monitoring system. 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.

2. The novel cryogenic storage tank according to claim 1, characterized in that: The first heat exchanger is a first coil.

3. The novel cryogenic storage tank according to claim 2, characterized in that: The second heat exchanger is a second coil.

4. The novel cryogenic storage tank according to claim 1, 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.

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

6. The novel cryogenic storage tank according to claim 4, characterized in that: 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.

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