Heat leakage compensation method for low-temperature storage tank

Abstract

The invention relates to the field of ultralow-temperature medium storage, in particular to a low-temperature storage tank heat leakage compensation method which comprises the steps that the heat leakage amount of a storage tank is obtained, the relation that the heat leakage amount is equal to the refrigerant heat absorption amount to maintain no phase change of media in the storage tank is achieved, the refrigerant flow is calculated, and the minimum heat exchange area is calculated according to the refrigerant flow. A heat exchange structure is arranged in the storage tank through the minimum heat exchange area, the effect of balancing heat absorption of a medium in the storage tank is achieved, a heat dissipation structure comprises a heat exchange pipe network, a refrigerant tank and a recovery tank, an extraction pump is arranged at an inlet, the pumping flow of the extraction pump is the calculated refrigerant flow, and the contact area of the heat exchange pipe network and a storage medium in the storage tank is the calculated heat exchange area. By means of the structural design, the effect of cooling the medium through the refrigerant supplementing agent in the heat absorption process of the medium in the storage tank can be achieved, and the situation that the medium is subjected to phase change, and consequently cost waste is caused is avoided.

Description

Technical Field

[0001] The present application generally relates to the field of ultra-low temperature medium storage, and in particular to a method for compensating heat leakage of a cryogenic storage tank. Background Art

[0002] The storage conditions of ultra-low temperature media are demanding, and strict requirements are placed on the ambient temperature and the thermal insulation effect of the storage equipment. Since the storage tank cannot achieve absolute thermal insulation, the ultra-low temperature medium will continuously absorb the heat of the storage tank, causing its own phase change. The current means of processing ultra-low temperature media after phase change, taking LNG as an example, include: direct discharge, compression to the pipeline network, circulating liquefaction, cascade liquefaction cycle, etc.

[0003] However, all of the above methods have the problems of serious pollution or serious energy consumption. For example, directly discharging the gas after phase change to prevent safety accidents caused by overpressure. Frequent evaporative gas emissions also have a negative impact on the environment, especially when the emitted gas is greenhouse gases such as methane, the pollution to the atmosphere is more serious.

[0004] Compress to the pipeline network, pressurize the discharged boil-off gas, re-compress it and recycle it to the re-condenser, mix it with the supercooled LNG entering the re-condenser, and then liquefy it to convert it back into liquid storage. This method effectively reduces resource waste and improves energy efficiency. However, although this method can effectively reduce resource waste, it requires the boil-off gas to be compressed and expanded and refrigerated to achieve re-liquefaction. This process requires high equipment investment.

[0005] The circulating liquefaction process has high efficiency and low power requirements, but it requires the installation of a large number of equipment to achieve it, which means large investment, complex equipment and high cost. Summary of the invention

[0006] In order to solve the problems of environmental pollution caused by the discharge of the gas after the phase change of the existing ultra-low temperature medium, and serious energy consumption caused by changing the phase of the gas after the phase change back to liquid, the present application provides a low-temperature storage tank heat leakage compensation method, which achieves the effect of maintaining the constant temperature of the medium in the storage tank so that it does not undergo phase change.

[0007] According to one aspect of the present application, a method for compensating heat leakage of a cryogenic storage tank is provided, comprising: S1.According to the factory parameters of the storage tank, obtain the heat leakage of the storage tank ; S2. Obtain the refrigerant flow rate by the following calculation method: (1) (2) According to formula (1) and formula (2), we can get: (3) In the formula, Indicates the amount of heat absorbed by the refrigerant and the amount of heat leakage from the tank ≤Heat absorption of refrigerant , Indicates the refrigerant flow rate, represents the specific heat capacity of the refrigerant, represents the latent heat of vaporization of the refrigerant, Indicates the temperature of the refrigerant before absorbing heat, Indicates the temperature of the refrigerant after absorbing heat; S3. Obtain the heat exchange area of ​​the heat dissipation structure by the following calculation method: (4) In the formula, Represents the heat transfer area of ​​the heat dissipation structure, Indicates the total heat exchange and the heat leakage of the tank ≤Heat absorption of refrigerant =Total heat exchange , Indicates the fouling coefficient of the heat dissipation structure, Represents the thermal conductivity of the heat dissipation structure, represents the logarithmic mean temperature difference; S4. The heat exchange area of ​​the heat dissipation structure calculated in step S3 , the heat exchange area is set in the inner layer of the tank The heat dissipation structure is spaced apart from the inner layer of the storage tank, and the heat dissipation structure is used to supply the flow calculated by the formula of refrigerant; In the step S3, the heat dissipation structure includes: The heat exchange pipe network is evenly distributed in the storage tank. The inlet of the heat exchange pipe network is connected to the refrigerant tank, and the outlet is connected to the recovery tank. An extraction pump is provided between the inlet and the refrigerant tank. The pumping flow of the extraction pump is the refrigerant flow in step S2. The contact area between the heat exchange pipe network and the storage medium in the tank is the heat exchange area of ​​the heat dissipation structure. .

[0008] In some embodiments, in step S1, the heat leakage of the storage tank Obtained by the following calculation method: (5) According to formula (5), we can get: (6) In the formula, represents the daily evaporation rate of the storage tank, Indicates the heat leakage of the tank. represents the volume of the tank, Indicates the density of the storage medium; is the latent heat of vaporization of the storage medium.

[0009] In some embodiments, the heat exchange network comprises: The liquid inlet main pipe is arranged outside the storage tank along the length direction of the storage tank, and the inlet is connected to the refrigerant tank; There are two groups of liquid inlet top pipes, one end of which is connected to the liquid inlet main pipe, and the other end is respectively set through the top and bottom ends of the storage tank; There are multiple groups of liquid inlet side pipes, which are arranged at intervals along the length direction of the liquid inlet main pipe, one end of which is connected to the circumferential outer wall of the liquid inlet main pipe, and the other end is arranged through the outer wall of the storage tank. In some embodiments, the heat exchange network further includes: There are multiple groups of liquid supply rings, which are arranged in the storage tank at intervals along the length direction of the storage tank, and the circumferential outer walls of the multiple groups of liquid supply rings are connected to the liquid inlet side pipes; The first mesh unit is provided with a plurality of groups, the plurality of first mesh units are arranged in a tubular shape and are arranged in the storage tank, the first mesh units are close to the inner wall of the storage tank and are arranged at intervals on the inner wall of the storage tank; Each first mesh unit is connected to a liquid supply ring respectively; The second mesh unit is provided in a plurality of groups, and the plurality of second mesh units are arranged in an arc shape and are arranged on the inner top surface and the inner bottom surface of the storage tank; Each second mesh unit is connected to the liquid inlet jacking pipe; The first mesh unit and the second mesh unit are in complete contact with the storage medium in the storage tank, and the total area of ​​the first mesh unit and the second mesh unit is the heat exchange area S of the heat dissipation structure.

[0010] In some embodiments, the heat exchange network further includes: The liquid outlet main pipe is arranged outside the storage tank along the length of the storage tank, and one end is connected to the recovery tank; The outlet top pipe has one end connected to the outlet main pipe and the other end passing through the storage tank; A plurality of first liquid outlet pipes are provided, and one end of the plurality of first liquid outlet pipes is connected to the second mesh unit; A liquid outlet ring is sleeved on the outer periphery of the second mesh unit, one end of each first liquid outlet pipe away from the second mesh unit is connected to each liquid outlet ring, and the liquid outlet ring is connected to the liquid outlet top pipe; A plurality of second liquid outlet pipes are provided, which are spaced apart along the length direction of the liquid outlet main pipe, one end of which is connected to the liquid outlet main pipe, and the other end of which is connected to each first mesh unit.

[0011] In some embodiments, the heat exchange network further includes: The temperature sensor is installed at one end of the liquid outlet main pipe close to the recovery tank; A first flow valve is provided between the inlet of the storage tank and the refrigerant tank.

[0012] The embodiments of the present application have the following advantages.

[0013] The solution provided by the present application is to provide a heat dissipation structure in the storage tank so that the medium in the storage tank absorbs heat and then is absorbed again by the heat dissipation structure, and the heat absorbed by the refrigerant provided by the heat dissipation structure is the same as the heat absorbed by the medium from the storage tank, so that the temperature of the medium does not change, thereby avoiding the problem of phase change of the medium in the storage tank. Compared with the traditional method of discharging the phase-changed medium for pressure relief after the phase change of the medium, or pressurizing and cooling the phase-changed medium to make it phase change back to liquid and then replenishing it into the storage tank, the solution provided by the present application prevents the medium from phase change, thereby improving the problem of air pollution caused by LNG gas emissions and the problem of serious energy consumption caused by phase change of the medium back to liquid.

[0014] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description and the accompanying drawings.

[0015] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings: Figure 1 A schematic flow chart of a heat leakage compensation method according to an embodiment of the present application is shown.

[0017] Figure 2 A schematic diagram of a storage tank structure according to an embodiment of the present application is shown.

[0018] Figure 3 A schematic diagram of a heat exchange pipe network structure according to an embodiment of the present application is shown.

[0019] Figure 4 A schematic diagram of a tubular arrangement of first mesh units according to an embodiment of the present application is shown.

[0020] Figure 5 A schematic diagram of the structure of a first mesh unit according to an embodiment of the present application is shown.

[0021] Figure 6 A schematic diagram of the second mesh unit structure according to an embodiment of the present application is shown.

[0022] Reference numerals 1-storage tank; 2-heat exchange pipe network; 4-refrigerant tank; 5-recovery tank; 21-liquid inlet main pipe; 22-liquid inlet top pipe; 23-liquid inlet side pipe; 24-liquid supply ring; 25-first mesh unit; 26-second mesh unit; 27-liquid outlet main pipe; 28-liquid outlet top pipe; 29-first liquid outlet pipe; 30-liquid outlet ring; 31-second liquid outlet pipe; 32-temperature sensor; 33-first flow valve. DETAILED DESCRIPTION

[0023] In order to make the purpose, scheme and advantages of the technical solution of the present application clearer, the technical solution of the embodiment of the present application will be clearly and completely described in conjunction with the drawings of the specific embodiments of the present application. Unless otherwise specified, the terms used herein have the usual meanings in the art. The same reference numerals in the drawings represent the same components.

[0024] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0025] As described above, in the use of traditional LNG cryogenic storage tanks, the temperature of the medium in the tank rises due to the heat absorption of the tank, causing the medium to undergo a phase change. Traditional methods of processing the medium after the phase change consume a lot of energy, or directly discharge it, causing environmental pollution and waste of resources.

[0026] See also Figure 1-Figure 6 In order to at least partially solve one or more of the above problems and other potential problems, an exemplary embodiment of the present application provides a method for compensating for heat leakage of a cryogenic storage tank, the method comprising: S1. Obtain the heat leakage of tank 1 according to the factory parameters of the tank ; S2. Obtain the refrigerant flow rate by the following calculation method: (1) (2) According to formula (1) and formula (2), we can get: (3) In the formula, Indicates the amount of heat absorbed by the refrigerant and the amount of heat leakage from tank 1 ≤Heat absorption of refrigerant , Indicates the refrigerant flow rate, represents the specific heat capacity of the refrigerant, represents the latent heat of vaporization of the refrigerant, Indicates the temperature of the refrigerant before absorbing heat, Indicates the temperature of the refrigerant after absorbing heat; S3. Obtain the heat exchange area of ​​the heat dissipation structure by the following calculation method: (4) In the formula, Represents the heat transfer area of ​​the heat dissipation structure, Indicates the total heat exchange and the heat leakage of the tank ≤Heat absorption of refrigerant =Total heat exchange , Indicates the fouling coefficient of the heat dissipation structure, Represents the thermal conductivity of the heat dissipation structure, represents the logarithmic mean temperature difference; S4. The heat exchange area of ​​the heat dissipation structure calculated in step S3 , the heat exchange area is set in the inner layer of tank 1 The heat dissipation structure is spaced apart from the inner layer of the storage tank 1, and the heat dissipation structure is used to supply the flow calculated by formula (3) of refrigerant; In step S3, the heat dissipation structure includes: a heat exchange network 2, which is evenly distributed in the storage tank 1, the inlet of the heat exchange network 2 is connected to the refrigerant tank 4, the outlet is connected to the recovery tank 5, and an extraction pump is provided between the inlet and the refrigerant tank 4, and the pumping flow of the extraction pump is the refrigerant flow in step S2 The contact area between the heat exchange pipe network 2 and the storage medium in the storage tank 1 is the heat exchange area of ​​the heat dissipation structure. .

[0027] In the above embodiment, the heat leakage of the LNG storage tank is related to multiple factors, such as the material, structure, ambient temperature, and storage medium of the storage tank. Since the storage medium and the installation location of the conventional LNG storage tank are determined before leaving the factory, the static evaporation rate of the storage tank can be obtained by the factory parameters. The daily evaporation rate of the storage tank can be obtained when the storage tank leaves the factory. Then, the heat leakage of the storage tank can be calculated according to the volume of the storage tank, the density of the storage medium and the latent heat of vaporization of the storage medium. The heat leakage of the storage tank is expressed as the heat absorption of the storage medium. When the storage medium obtains heat from the storage tank, if the heat is not dissipated in time, the temperature of the stored medium will increase, causing the medium to undergo a phase change. This solution sets a heat dissipation structure in the storage tank. When the medium absorbs heat, the heat dissipation structure dissipates the heat, so that the temperature of the medium does not change. The cooling capacity provided by the heat dissipation structure is balanced with the heat absorbed by the medium. For the acquisition of static evaporation rate, please refer to Table 1: Table 1 Design parameters of a cryogenic storage tank

[0028] When calculating the refrigerant flow rate, the amount of cooling added to the medium, that is, the amount of heat absorbed by the refrigerant, is equal to the amount of heat absorbed by the refrigerant, that is, the amount of heat leakage of the storage tank. Substitute the specific heat capacity of the refrigerant and the latent heat of vaporization of the refrigerant into formula (3). In general, liquid nitrogen can be selected as the refrigerant. The formula (3) is the initial temperature of the cryogen. When liquid nitrogen is selected, the initial temperature -196℃, is the temperature of the refrigerant after absorbing the heat of the medium. This temperature is consistent with the temperature of the medium before absorbing heat. Therefore, formula (3) can be used to calculate the medium flow rate based on the above data.

[0029] It is worth noting that the heat leakage of the tank ≤Heat absorption of refrigerant , since the static evaporation rate of the storage tank is the daily average, it is necessary to add refrigerant greater than the calculated refrigerant flow rate.

[0030] It is worth noting that the heat exchange area of ​​the heat dissipation structure calculated is the minimum heat transfer area, at flow rate Under these conditions, when installing the heat dissipation structure, the heat exchange area of ​​the heat dissipation structure must be larger than the calculated heat exchange area. ; The heat exchange network 2 is arranged in the storage tank 1, and is used to absorb heat from the medium near the inner wall of the storage tank 1 and then dissipate the heat. When the heat exchange network 2 is working, the refrigerant tank 4 supplies liquid nitrogen into the heat exchange network 2. The liquid nitrogen absorbs the heat of the medium through the heat exchange network 2 and then enters the recovery tank 5 for recovery.

[0031] See also Figure 1-Figure 6 In some embodiments, in step S1, the heat leakage of the storage tank Obtained by the following calculation method: (5) According to formula (5), we can get: (6) In the formula, represents the daily evaporation rate of the storage tank, Indicates the heat leakage of the tank. represents the volume of the tank, Indicates the density of the storage medium; is the latent heat of vaporization of the storage medium.

[0032] In the above embodiment, the daily evaporation rate of the storage tank is According to the factory data of the storage tank, the formula (5) Indicates the time is 24h, the volume of the tank , the density and latent heat of vaporization of the storage medium are known, so the heat leakage of the storage tank can be calculated .

[0033] See also Figure 1-Figure 6 In some embodiments, the heat exchange pipe network 2 includes: a liquid inlet main pipe 21, which is arranged outside the storage tank 1 along the length direction of the storage tank 1, and the inlet is connected to the refrigerant tank 4; a liquid inlet top pipe 22, which is provided with two groups, one end of which is connected to the liquid inlet main pipe 21, and the other end is respectively arranged through the top and bottom ends of the storage tank 1; a plurality of liquid inlet side pipes 23, which are provided with multiple groups, are arranged at intervals along the length direction of the liquid inlet main pipe 21, one end of which is connected to the circumferential outer wall of the liquid inlet main pipe 21, and the other end is arranged through the outer wall of the storage tank 1. In the above embodiment, the cryogen tank 4 pumps liquid nitrogen into the liquid inlet main pipe 21 through a liquid pump. It is also possible but not limited to using a cryogen tank that is higher than the storage tank 1. The cryogen is supplied into the liquid inlet main pipe 21 by gravity, and the liquid nitrogen enters the liquid inlet top pipe 22 and the liquid inlet side pipe 23 along the liquid inlet main pipe 21. The medium on the inner top and inner bottom surfaces of the storage tank 1 is heat-absorbed through the liquid inlet top pipe 22, and the medium at the waist position of the storage tank 1 is heat-absorbed through the liquid inlet side pipe 23, so that the medium in the storage tank 1 close to the inner wall of the storage tank 1 can absorb the heat of the storage tank 1 and then the heat can be absorbed by the cryogen, thereby avoiding phase change after heat absorption.

[0034] See also Figure 1-Figure 6 In some embodiments, the heat exchange pipe network 2 further includes: a liquid supply ring 24, which is provided with a plurality of groups, and the plurality of groups of liquid supply rings 24 are arranged in the storage tank 1 at intervals along the length direction of the storage tank 1, and the circumferential outer walls of the plurality of groups of liquid supply rings 24 are connected to the liquid inlet side pipe 23; a first mesh unit 25, which is provided with a plurality of groups, and the plurality of first mesh units 25 are arranged in a tubular shape and are arranged in the storage tank 1, and the first mesh units 25 are close to the inner wall of the storage tank 1 and are arranged at intervals on the inner wall of the storage tank 1; each first mesh unit 25 is respectively connected to the liquid supply ring 24; a second mesh unit 26, which is provided with a plurality of groups, and the plurality of second mesh units 26 are arranged in an arc shape and are arranged on the inner top surface and the inner bottom surface of the storage tank 1; each second mesh unit 26 is connected to the liquid inlet top pipe 22; wherein the first mesh unit 25 and the second mesh unit 26 are in full contact with the storage medium in the storage tank 1, and the total area of ​​the first mesh unit 25 and the second mesh unit 26 is the heat exchange area of ​​the heat dissipation structure .

[0035] In the above embodiment, the planes where the liquid supply rings 24 are located are parallel to each other, and the inner walls of the liquid supply rings 24 are connected to multiple first mesh units 25. The first mesh units 25 are arranged in a circular array with the center of the liquid supply ring 24. The first mesh units 25 of each liquid supply ring 24 form a tubular shape. The tubular first mesh units 25 are sleeved in the storage tank 1 and close to the inner wall of the storage tank 1. After the medium on the side of the first mesh unit 25 close to the inner wall of the storage tank 1 absorbs the heat of the storage tank 1, the heat is absorbed by the refrigerant in the first mesh unit 25, so that the temperature of the medium does not change. The second mesh units 26 are arranged in an arc shape, which fits the hemispherical top and bottom surfaces of the storage tank 1. The second mesh units 26 are used to absorb heat and cool the medium on the inner top and inner bottom surfaces of the storage tank 1.

[0036] See also Figure 1-Figure 6 In some embodiments, the heat exchange pipe network 2 further includes: a liquid outlet main pipe 27, which is arranged outside the storage tank 1 along the length direction of the storage tank 1 and connected to the recovery tank 5 at one end; a liquid outlet top pipe 28, one end of which is connected to the liquid outlet main pipe 27 and the other end is arranged through the storage tank 1; a first liquid outlet pipe 29, of which a plurality of first liquid outlet pipes 29 are provided, and one end of the plurality of first liquid outlet pipes 29 is connected to the second mesh unit 26; a liquid outlet ring 30, which is sleeved on the outer periphery of the second mesh unit 26, and one end of each first liquid outlet pipe 29 away from the second mesh unit 26 is connected to each liquid outlet ring 30, and the liquid outlet ring 30 is connected to the liquid outlet top pipe 28; a second liquid outlet pipe 31, of which a plurality of second liquid outlet pipes 31 are provided, which are arranged at intervals along the length direction of the liquid outlet main pipe 27, one end of which is connected to the liquid outlet main pipe 27 and the other end of which is connected to each first mesh unit 25.

[0037] In the above embodiment, the liquid outlet main pipe 27 is used to discharge the refrigerant after absorbing heat in the liquid outlet top pipe 28 and the second liquid outlet pipe 31. The refrigerant absorbs heat through phase change in the first mesh unit 25 and the second mesh unit 26 and is then collected in the recovery tank 5.

[0038] See also Figure 1-Figure 6 In some embodiments, the heat exchange pipe network 2 further includes: a temperature sensor 32, which is arranged at one end of the liquid outlet main pipe close to the recovery tank 5; and a first flow valve 33 is arranged between the inlet of the storage tank 1 and the refrigerant tank 4.

[0039] In the above embodiment, the temperature sensor 32 is used to detect the temperature of the refrigerant after absorbing heat. By detecting that the temperature of the refrigerant after absorbing heat is the same as the temperature of the medium in the storage tank 1, the temperature of the medium in the storage tank 1 can be inferred. The first flow valve 33 is used to detect the flow rate of the refrigerant provided by the refrigerant tank 4 to the liquid inlet main pipe 21.

[0040] The embodiments of the present application have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

[0041] The terms used in this document are selected to best explain the principles of the embodiments, practical applications or technical improvements in the marketplace, or to enable other ordinary technicians in this technical field to understand the embodiments disclosed herein.

[0042] The above are only optional embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for compensating heat leakage of a cryogenic storage tank, characterized in that: include: S1. Obtain the heat leakage of the storage tank (1) based on the factory parameters of the storage tank ; S2. Obtain the refrigerant flow rate by the following calculation method: （1） （2） According to formula (1) and formula (2), we can get: （3） In the formula, represents the amount of heat absorbed by the refrigerant and the amount of heat leakage from the storage tank (1) ≤Heat absorption of refrigerant , Indicates the refrigerant flow rate, represents the specific heat capacity of the refrigerant, represents the latent heat of vaporization of the refrigerant, Indicates the temperature of the refrigerant before absorbing heat, Indicates the temperature of the refrigerant after absorbing heat; S3. Obtain the heat exchange area of ​​the heat dissipation structure by the following calculation method: （4） In the formula, Represents the heat transfer area of ​​the heat dissipation structure, Indicates the total heat exchange and the heat leakage of the tank ≤Heat absorption of refrigerant =Total heat exchange , Indicates the fouling coefficient of the heat dissipation structure, Represents the thermal conductivity of the heat dissipation structure, represents the logarithmic mean temperature difference; S4. The heat exchange area of ​​the heat dissipation structure calculated in step S3 , a heat exchange area of The heat dissipation structure is spaced apart from the inner layer of the storage tank (1), and the heat dissipation structure is used to supply the flow calculated by formula (3) of refrigerant; In the step S3, the heat dissipation structure includes: The heat exchange pipe network (2) is evenly distributed in the storage tank (1), the inlet of the heat exchange pipe network (2) is connected to the refrigerant tank (4), the outlet is connected to the recovery tank (5), an extraction pump is provided between the inlet and the refrigerant tank (4), and the pumping flow of the extraction pump is the refrigerant flow in step S2 The contact area between the heat exchange pipe network (2) and the storage medium in the storage tank (1) is the heat exchange area of ​​the heat dissipation structure. .

2. The method for compensating heat leakage of a cryogenic storage tank according to claim 1, characterized in that: In step S1, the heat leakage of the tank Obtained by the following calculation method: （5） According to formula (5), we can get: （6） In the formula, represents the daily evaporation rate of the storage tank, Indicates the heat leakage of the tank. represents the volume of the tank, Indicates the density of the storage medium; is the latent heat of vaporization of the storage medium.

3. The method for compensating heat leakage of a cryogenic storage tank according to claim 2, characterized in that: The heat exchange pipe network (2) comprises: A liquid inlet main pipe (21) is arranged outside the storage tank (1) along the length direction of the storage tank (1), and the inlet is connected to the refrigerant tank (4); The liquid inlet top pipe (22) is provided in two groups, one end of which is connected to the liquid inlet main pipe (21), and the other end of which is respectively arranged through the top end and the bottom end of the storage tank (1); The liquid inlet side pipes (23) are provided in a plurality of groups and are arranged at intervals along the length direction of the liquid inlet main pipe (21), one end of which is connected to the circumferential outer wall of the liquid inlet main pipe (21) and the other end of which is arranged to pass through the outer wall of the storage tank (1).

4. The method for compensating heat leakage of a cryogenic storage tank according to claim 3, characterized in that: The heat exchange pipe network (2) further comprises: A plurality of liquid supply rings (24) are provided, and the plurality of liquid supply rings (24) are arranged in the storage tank (1) at intervals along the length direction of the storage tank (1), and the peripheral outer walls of the plurality of liquid supply rings (24) are in communication with the liquid inlet side pipe (23); The first mesh units (25) are provided in a plurality of groups, the plurality of first mesh units (25) are arranged in a tubular shape and are arranged in the storage tank (1), the first mesh units (25) are close to the inner wall of the storage tank (1) and are arranged at intervals on the inner wall of the storage tank (1); Each first mesh unit (25) is respectively connected to a liquid supply ring (24); The second mesh units (26) are provided in a plurality of groups, and the plurality of second mesh units (26) are arranged in an arc shape and are provided on the inner top surface and the inner bottom surface of the storage tank (1); Each second mesh unit (26) is in communication with the liquid inlet top pipe (22); wherein The first mesh unit (25) and the second mesh unit (26) are in complete contact with the storage medium in the storage tank (1), and the total area of ​​the first mesh unit (25) and the second mesh unit (26) is the heat exchange area of ​​the heat dissipation structure. .

5. The method for compensating heat leakage of a cryogenic storage tank according to claim 4, characterized in that: The heat exchange pipe network (2) further comprises: A liquid outlet main pipe (27) is arranged outside the storage tank (1) along the length direction of the storage tank (1), and one end of the liquid outlet main pipe is connected to the recovery tank (5); A liquid outlet top pipe (28), one end of which is connected to the liquid outlet main pipe (27) and the other end of which is disposed through the storage tank (1); A plurality of first liquid outlet pipes (29) are provided, and one end of the plurality of first liquid outlet pipes (29) is connected to the second mesh unit (26); A liquid outlet ring (30) is sleeved on the outer circumference of the second mesh unit (26); one end of each first liquid outlet pipe (29) away from the second mesh unit (26) is connected to each liquid outlet ring (30); and the liquid outlet ring (30) is connected to the liquid outlet top pipe (28); A plurality of second liquid outlet pipes (31) are provided and are spaced apart along the length direction of the liquid outlet main pipe (27), one end of which is connected to the liquid outlet main pipe (27) and the other end of which is connected to each first mesh unit (25).

6. The method for compensating heat leakage of a cryogenic storage tank according to claim 5, characterized in that: The heat exchange pipe network (2) further comprises: A temperature sensor (32) is disposed at one end of the liquid outlet main pipe close to the recovery tank (5); A first flow valve (33) is provided between the inlet of the storage tank (1) and the refrigerant tank (4).

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