A liquid storage system

Abstract

This utility model relates to the field of liquefied air separation technology and proposes a liquid storage system, including: a heat exchange mechanism, a liquid nitrogen storage tank, and a liquid argon storage tank; the heat exchange mechanism includes an inner cylinder and an outer cylinder, with the inner cylinder located inside the outer cylinder; a nitrogen pipeline and a liquid nitrogen pipeline are respectively connected to the outer cylinder, the nitrogen pipeline connecting to the top of the liquid nitrogen storage tank and the liquid nitrogen pipeline connecting to the liquid nitrogen storage tank; an argon pipeline is connected to the top of the inner cylinder, and a reflux pipeline is connected to the bottom of the inner cylinder, with the argon pipeline and reflux pipeline respectively connected to the top of the liquid argon storage tank. This system, while storing liquid nitrogen and liquid argon, utilizes a small amount of liquid nitrogen and nitrogen evaporated from the upper part of the liquid nitrogen storage tank to recover argon evaporated from the upper part of the liquid argon storage tank. Compared to existing methods of directly venting nitrogen and argon into the air, this system achieves cold energy recovery and reuse, effectively reducing liquid argon loss and improving economic efficiency.

Description

Technical Field

[0001] This utility model relates to the field of liquefied air separation technology, and in particular to a liquid storage system. Background Technology

[0002] For fully liquefied air separation units, the typical products are three cryogenic liquids: liquid oxygen, liquid nitrogen, and liquid argon. After exiting the cold box, these three cryogenic products are sent to the backup liquid storage system through vacuum-insulated pipelines. The liquid storage system is usually equipped with atmospheric pressure liquid oxygen storage tanks, atmospheric pressure liquid nitrogen storage tanks, and atmospheric pressure liquid argon storage tanks. When the liquid level in the storage tanks is high, the liquid products are filled into tank trucks for sale.

[0003] Due to factors such as ambient temperature, some of the cryogenic liquid in the storage tank will absorb heat and vaporize into cryogenic gas, causing an increase in tank pressure (the cryogenic liquid storage tank is designed with a daily evaporation rate of 0.2% / day). All three cryogenic liquid storage tanks are atmospheric pressure tanks, and the pressure inside the tank cylinder must not exceed 20 kPa to prevent overpressure deformation of the tank cylinder or overpressure rupture of instrument pipelines, which could lead to a major production accident. Therefore, a pressure regulating valve is usually installed at the top of the tank cylinder to release the cryogenic gas into the air, controlling the tank cylinder pressure to remain stable below 20 kPa. However, releasing the cryogenic gas into the air inevitably results in cooling loss, reducing economic efficiency. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a liquid storage system to solve the above-mentioned technical problem.

[0005] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: A liquid storage system includes: a heat exchange mechanism, a liquid nitrogen storage tank, and a liquid argon storage tank; the heat exchange mechanism includes an inner cylinder and an outer cylinder, the inner cylinder being disposed inside the outer cylinder; a nitrogen pipeline and a liquid nitrogen pipeline are respectively connected to the outer cylinder, the nitrogen pipeline being connected to the top of the liquid nitrogen storage tank, and the liquid nitrogen pipeline being connected to the liquid nitrogen storage tank; an argon pipeline is connected to the top of the inner cylinder, and a return pipeline is connected to the bottom of the inner cylinder, the argon pipeline and the return pipeline being respectively connected to the top of the liquid argon storage tank.

[0006] The beneficial effects of this invention are as follows: Based on the storage of liquid nitrogen and liquid argon, this system utilizes a small amount of liquid nitrogen and the nitrogen gas evaporated from the upper part of the liquid nitrogen storage tank to recover the argon gas evaporated from the upper part of the liquid argon storage tank. Compared to the existing method of directly venting nitrogen and argon gas into the air, this system achieves cold energy recovery and reuse, effectively reducing liquid argon loss and improving economic efficiency.

[0007] Based on the above technical solution, the present invention can be further improved as follows.

[0008] Furthermore, a first exhaust pipeline is connected to the argon gas pipeline.

[0009] The beneficial effect of adopting the above-mentioned further scheme is that the argon gas evaporated above the liquid argon storage tank can be discharged into the air through the first exhaust pipeline.

[0010] Furthermore, the heat exchange mechanism also includes a heat exchange body, the outer cylinder is disposed inside the heat exchange body, and a first thermal insulation material is filled between the outer cylinder and the heat exchange body.

[0011] The beneficial effect of adopting the above-mentioned further solution is that by filling the space between the outer cylinder and the heat exchange body with a first thermal insulation material, the thermal insulation effect is achieved, effectively preventing heat from the environment from being conducted to the outer cylinder and the inner cylinder.

[0012] Furthermore, the liquid argon storage tank includes a storage tank body and a liquid tank, the liquid tank being disposed inside the storage tank body, and a second thermal insulation material being filled between the liquid tank and the storage tank body.

[0013] The beneficial effects of adopting the above-mentioned further solution are: the liquid argon storage tank with a double-layer cylindrical structure consisting of the main body of the storage tank and the liquid tank, and the insulation effect achieved by filling the liquid tank and the main body of the storage tank with a second heat insulation material, effectively preventing heat from the environment from being conducted to the liquid tank.

[0014] Furthermore, a thermometer is installed inside the outer cylinder, and a first valve is installed on the liquid nitrogen pipeline.

[0015] The beneficial effect of adopting the above-mentioned further solution is that by monitoring the temperature of the liquid nitrogen in the outer cylinder with a thermometer, the opening of the first valve can be adjusted according to the temperature of the liquid nitrogen in the outer cylinder, thereby controlling the flow rate of liquid nitrogen entering the outer cylinder.

[0016] Furthermore, it also includes a first drain line and a liquid nitrogen recovery tank, with one end of the first drain line connected to the bottom of the outer cylinder and the other end of the first drain line connected to the liquid nitrogen recovery tank.

[0017] The beneficial effect of adopting the above-mentioned further solution is that the liquid nitrogen in the outer cylinder can be discharged into the liquid nitrogen recovery tank through the first drain pipeline.

[0018] Furthermore, a level gauge is installed inside the outer cylinder, and a second valve is installed on the first drain line.

[0019] The beneficial effect of adopting the above-mentioned further solution is that the liquid nitrogen level in the outer cylinder is monitored by the level gauge, and the opening of the second valve can be adjusted according to the liquid nitrogen level in the outer cylinder.

[0020] Furthermore, a second exhaust pipe is connected to the top of the outer cylinder.

[0021] The beneficial effect of adopting the above-mentioned further solution is that nitrogen gas in the outer cylinder is discharged through the second exhaust pipeline.

[0022] Furthermore, it also includes a second drain line and a liquid argon recovery tank, with one end of the second drain line connected to the return line and the other end of the second drain line connected to the liquid argon recovery tank.

[0023] The beneficial effect of adopting the above-mentioned further solution is that, through the second drain pipeline, the liquid argon in the inner cylinder can be discharged to the liquid argon recovery tank according to actual needs.

[0024] Furthermore, a liquid argon delivery pipeline is connected to the bottom of the liquid argon storage tank.

[0025] The beneficial effect of adopting the above-mentioned further solution is that liquid argon in the liquid argon storage tank can be transported to the receiving vehicle, etc., through the liquid argon delivery pipeline for use. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of a liquid storage system according to the present invention.

[0027] The attached diagram lists the components represented by each number as follows:

[0028] 1. Inner cylinder; 2. Outer cylinder; 3. Nitrogen pipeline; 4. Liquid nitrogen pipeline; 5. Argon pipeline; 6. Return pipeline; 7. First exhaust pipeline; 8. Heat exchanger body; 9. First thermal insulation material; 10. Storage tank body; 11. Liquid tank; 12. Second thermal insulation material; 13. First valve; 14. First drain pipeline; 15. Liquid nitrogen recovery tank; 16. Second valve; 17. Second exhaust pipeline; 18. Second drain pipeline; 19. Liquid argon recovery tank; 20. Liquid argon delivery pipeline; 21. Liquid nitrogen storage tank body; 22. Liquid nitrogen tank; 23. Third thermal insulation material; 24. Nitrogen exhaust pipeline; 25. Liquid nitrogen inlet pipeline; 26. Liquid nitrogen delivery pipeline; 27. Liquid argon inlet pipeline. Detailed Implementation

[0029] The principles and features of this utility model are described below. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0030] Example 1

[0031] To prevent excessive pressure within the liquid storage tank, the pressure regulating valve at the top of the tank remains open, allowing the evaporated gas to escape into the air. However, this venting method results in a waste of some of the tank's cooling capacity. Liquid argon atmospheric pressure storage tanks are often relatively small, and the market price of liquid argon is significantly higher than that of liquid nitrogen or liquid oxygen. Liquid nitrogen has a lower boiling point (-196℃) than liquid argon (-186℃), and nitrogen constitutes approximately 78% of the air, while argon accounts for approximately 0.9%. Similarly, in a complete liquefaction air separation process, the daily production of liquid nitrogen is much higher than that of liquid argon.

[0032] Based on this, such as Figure 1 As shown, this embodiment provides a liquid storage system, including: a heat exchange mechanism, a liquid nitrogen storage tank, and a liquid argon storage tank; the heat exchange mechanism includes an inner cylinder 1 and an outer cylinder 2, with the inner cylinder 1 disposed inside the outer cylinder 2; a nitrogen pipeline 3 and a liquid nitrogen pipeline 4 are respectively connected to the outer cylinder 2, with the nitrogen pipeline 3 connected to the top of the liquid nitrogen storage tank and the liquid nitrogen pipeline 4 connected to the liquid nitrogen storage tank; an argon pipeline 5 is connected to the top of the inner cylinder 1, and a return pipeline 6 is connected to the bottom of the inner cylinder 1, with the argon pipeline 5 and the return pipeline 6 respectively connected to the top of the liquid argon storage tank.

[0033] This system is applicable to fully liquefied air separation processes. It stores the produced liquid nitrogen in a liquid nitrogen storage tank and the produced liquid argon in a liquid argon storage tank. The inner cylinder 1 of the heat exchange mechanism forms a tube side, where argon gas evaporated above the liquid argon storage tank flows into the tube side through argon gas line 5. The outer wall of inner cylinder 1 and the inner wall of outer cylinder 2 form a shell side, where nitrogen gas evaporated above the liquid nitrogen storage tank and a portion of the liquid nitrogen in the tank are introduced into the shell side through nitrogen gas line 3 and liquid nitrogen line 4. Liquid nitrogen, nitrogen gas, and argon gas exchange heat within the heat exchange mechanism, causing the argon gas to condense into liquid argon. The liquid argon flows back into the liquid argon storage tank through return line 6, achieving argon gas recovery.

[0034] This system, based on the storage of liquid nitrogen and liquid argon, utilizes a small amount of liquid nitrogen and the nitrogen gas evaporated from the upper part of the liquid nitrogen storage tank to recover the argon gas evaporated from the upper part of the liquid argon storage tank. Compared with the existing method of directly venting nitrogen and argon gas into the air, this system achieves cold energy recovery and reuse, which can effectively reduce liquid argon loss and improve economic efficiency.

[0035] Optionally, in this embodiment, a second exhaust line 17 is connected to the top of the outer cylinder 2, and a valve is installed on the second exhaust line 17. Nitrogen gas in the outer cylinder 2 is discharged through the second exhaust line 17.

[0036] Optionally, in this embodiment, a thermometer is installed inside the outer cylinder 2, and a first valve 13 is installed on the liquid nitrogen pipeline 4. The temperature of the liquid nitrogen inside the outer cylinder 2 is monitored by the thermometer, and the opening of the first valve 13 is adjusted according to the temperature of the liquid nitrogen inside the outer cylinder 2 to control the flow rate of liquid nitrogen entering the outer cylinder 2.

[0037] Optionally, in an embodiment, the heat exchange mechanism further includes a heat exchange body 8, with an outer cylinder 2 disposed inside the heat exchange body 8, and a first thermal insulation material 9 filling the space between the outer cylinder 2 and the heat exchange body 8.

[0038] The first thermal insulation material 9 is made of perlite. By filling the space between the outer cylinder 2 and the heat exchange body 8 with the first thermal insulation material 9, thermal insulation is achieved, effectively preventing heat from the environment from being conducted to the outer cylinder 2 and the inner cylinder 1. A first sealing gas pipe is connected to the heat exchange body 8, and sealing gas is introduced between the outer cylinder 2 and the heat exchange body 8 through the first sealing gas pipe.

[0039] Optionally, in an embodiment, the liquid argon storage tank includes a storage tank body 10 and a liquid tank 11. The liquid tank 11 is disposed inside the storage tank body 10, and a second thermal insulation material 12 is filled between the liquid tank 11 and the storage tank body 10.

[0040] The storage tank body 10 and the liquid tank 11 constitute a double-walled cylindrical liquid argon storage tank. The storage tank body 10 is made of carbon steel, and the liquid tank 11 is made of stainless steel. The second thermal insulation material 12 is made of perlite. By filling the space between the liquid tank 11 and the storage tank body 10 with the second thermal insulation material 12, thermal insulation is achieved, effectively preventing heat from the environment from being conducted into the liquid tank 11. A second sealing gas pipeline is connected to the storage tank body 10, through which sealing gas is introduced between the storage tank body 10 and the liquid tank 11.

[0041] The liquid argon storage tank is connected to a liquid argon inlet pipeline 27, which is equipped with a valve. The produced liquid argon is sent to the liquid argon storage tank for storage through the liquid argon inlet pipeline 27.

[0042] Optionally, in this embodiment, a liquid argon delivery pipeline 20 is connected to the bottom of the liquid argon storage tank, and a valve is installed on the liquid argon delivery pipeline 20. The liquid argon in the storage tank can be delivered to a receiving vehicle or similar equipment via the liquid argon delivery pipeline 20 for use.

[0043] Argon gas line 5 is connected to the top of the liquid argon storage tank. Optionally, in this embodiment, a first exhaust line 7 is connected to argon gas line 5. Valves are installed on argon gas line 5 and the first exhaust line 7, respectively, so that the argon gas evaporating above the liquid argon storage tank can be discharged into the air through the first exhaust line 7.

[0044] The liquid nitrogen storage tank includes a liquid nitrogen storage tank body 21 and a liquid nitrogen tank 22. The liquid nitrogen tank 22 is located inside the liquid nitrogen storage tank body 21. The liquid nitrogen storage tank body 21 and the liquid nitrogen tank 22 form a double-layer cylindrical structure liquid nitrogen storage tank. The liquid nitrogen storage tank body 21 is made of carbon steel, and the liquid nitrogen tank 22 is made of stainless steel.

[0045] A third thermal insulation material 23, made of perlite, is filled between the liquid nitrogen tank 22 and the liquid nitrogen storage tank body 21. This third thermal insulation material 23 achieves thermal insulation, effectively preventing heat from the environment from being conducted into the liquid nitrogen tank 22. A third sealing gas pipe is connected to the liquid nitrogen storage tank body 21, through which sealing gas is introduced between the liquid nitrogen tank 22 and the liquid nitrogen storage tank body 21.

[0046] A liquid nitrogen inlet pipeline 25 is connected to the liquid nitrogen storage tank, and a valve is installed on the liquid nitrogen inlet pipeline 25. The produced liquid nitrogen is sent to the liquid nitrogen storage tank for storage through the liquid nitrogen inlet pipeline 25.

[0047] A nitrogen venting line 24 is connected to the top of the liquid nitrogen storage tank, and a valve is installed on the nitrogen venting line 24. The nitrogen gas that evaporates from the top of the liquid nitrogen storage tank can be discharged through the nitrogen venting line 24.

[0048] The bottom of the liquid nitrogen storage tank is connected to a liquid nitrogen delivery pipeline 26, which is equipped with a valve. The liquid nitrogen in the storage tank can be delivered to receiving trucks and other equipment via the liquid nitrogen delivery pipeline 26 for use.

[0049] Example 2

[0050] Based on Embodiment 1, the liquid storage system further includes a first drain line 14 and a liquid nitrogen recovery tank 15. One end of the first drain line 14 is connected to the bottom of the outer cylinder 2, and the other end of the first drain line 14 is connected to the liquid nitrogen recovery tank 15. Through the first drain line 14, liquid nitrogen in the outer cylinder 2 can be discharged into the liquid nitrogen recovery tank 15.

[0051] Optionally, in this embodiment, a level gauge is installed inside the outer cylinder 2, and a second valve 16 is installed on the first drain line 14.

[0052] The liquid nitrogen level in the outer cylinder 2 is monitored by a level gauge, and the opening of the second valve 16 is adjusted according to the liquid nitrogen level in the outer cylinder 2. When the liquid nitrogen level in the outer cylinder 2 is too high, the liquid nitrogen is discharged into the liquid nitrogen recovery tank 15 through the first drain line 14.

[0053] The level gauges include local and remote level gauges, both used to monitor the liquid nitrogen level in the outer cylinder 2. The local level gauge allows on-site personnel to directly monitor the liquid nitrogen level. Furthermore, a controller is installed, with the remote level gauge and the second valve 16 electrically connected to it. This controller automatically controls the opening and closing of the valves based on the liquid nitrogen level, maintaining the stability of the liquid nitrogen level.

[0054] Example 3

[0055] Based on Embodiment 1, the liquid storage system further includes a second drain line 18 and a liquid argon recovery tank 19. One end of the second drain line 18 is connected to the return line 6, and the other end of the second drain line 18 is connected to the liquid argon recovery tank 19. A valve is installed on the second drain line 18, through which liquid argon in the inner cylinder 1 can be discharged into the liquid argon recovery tank 19 as needed.

[0056] Example 4

[0057] Based on Embodiment 1, the thermometer includes a local thermometer and a remote thermometer. The local thermometer allows on-site personnel to intuitively understand the temperature of the liquid nitrogen. Three local thermometers and three remote thermometers are installed, respectively, at the top, middle, and bottom of the outer casing, for monitoring the liquid nitrogen temperature. A controller is also provided, with the remote thermometers and the first valve 13 electrically connected to it. The opening of the first valve 13 is directly controlled based on the temperature of the liquid nitrogen in the outer cylinder 2, thereby regulating the liquid nitrogen flow rate.

[0058] Example 5, based on Example 1, further includes a liquid oxygen storage tank in the liquid storage system. Specifically, the liquid oxygen storage tank comprises a main body and a liquid oxygen tank, with the liquid oxygen tank located inside the main body. The main body and the liquid oxygen tank form a double-layered cylindrical structure. The main body is made of carbon steel, and the liquid oxygen tank is made of stainless steel.

[0059] Perlite is used to fill the space between the liquid oxygen tank and the main body of the liquid oxygen storage tank to provide insulation and effectively prevent heat from the environment from being conducted into the liquid oxygen tank. A fourth sealing gas pipeline is connected to the main body of the liquid oxygen storage tank, through which sealing gas is introduced between the liquid oxygen tank and the main body of the liquid oxygen storage tank.

[0060] The liquid oxygen storage tank is connected to a liquid oxygen inlet pipeline, which is equipped with valves. Produced liquid oxygen is delivered to the liquid oxygen storage tank for storage via the inlet pipeline.

[0061] An oxygen venting line is connected to the top of the liquid oxygen storage tank, and a valve is installed on the oxygen venting line. The oxygen that evaporates from the top of the liquid oxygen storage tank can be discharged through the oxygen venting line.

[0062] The bottom of the liquid oxygen storage tank is connected to a liquid oxygen delivery pipeline, which is equipped with valves. The liquid oxygen in the storage tank can be delivered to receiving trucks and other equipment via the pipeline for use.

[0063] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0064] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0065] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0066] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0067] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0068] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A liquid storage system, characterized in that, include: Heat exchange mechanism, liquid nitrogen storage tank and liquid argon storage tank; The heat exchange mechanism includes an inner cylinder (1) and an outer cylinder (2), the inner cylinder (1) being disposed inside the outer cylinder (2); a nitrogen pipeline (3) and a liquid nitrogen pipeline (4) are respectively connected to the outer cylinder (2), the nitrogen pipeline (3) being connected to the top of the liquid nitrogen storage tank, and the liquid nitrogen pipeline (4) being connected to the liquid nitrogen storage tank; An argon gas pipeline (5) is connected to the top of the inner cylinder (1), and a return pipeline (6) is connected to the bottom of the inner cylinder (1). The argon gas pipeline (5) and the return pipeline (6) are respectively connected to the top of the liquid argon storage tank.

2. The liquid storage system according to claim 1, characterized in that, The argon gas pipeline (5) is connected to the first exhaust pipeline (7).

3. The liquid storage system according to claim 1, characterized in that, The heat exchange mechanism further includes a heat exchange body (8), the outer cylinder (2) is disposed inside the heat exchange body (8), and a first heat insulation material (9) is filled between the outer cylinder (2) and the heat exchange body (8).

4. The liquid storage system according to claim 1, characterized in that, The liquid argon storage tank includes a storage tank body (10) and a liquid tank (11). The liquid tank (11) is disposed inside the storage tank body (10), and a second thermal insulation material (12) is filled between the liquid tank (11) and the storage tank body (10).

5. A liquid storage system according to claim 1, characterized in that, A thermometer is installed inside the outer cylinder (2), and a first valve (13) is installed on the liquid nitrogen pipeline (4).

6. The liquid storage system according to claim 1, characterized in that, It also includes a first drain line (14) and a liquid nitrogen recovery tank (15), one end of the first drain line (14) is connected to the bottom of the outer cylinder (2), and the other end of the first drain line (14) is connected to the liquid nitrogen recovery tank (15).

7. A liquid storage system according to claim 6, characterized in that, A level gauge is installed inside the outer cylinder (2), and a second valve (16) is installed on the first drain line (14).

8. The liquid storage system according to claim 1, characterized in that, The top of the outer cylinder (2) is connected to a second exhaust pipe (17).

9. A liquid storage system according to claim 1, characterized in that, It also includes a second drain line (18) and a liquid argon recovery tank (19), one end of the second drain line (18) is connected to the return line (6), and the other end of the second drain line (18) is connected to the liquid argon recovery tank (19).

10. A liquid storage system according to any one of claims 1-9, characterized in that, The bottom of the liquid argon storage tank is connected to a liquid argon delivery pipeline (20).

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