Wire exit system of cryogenic fluid storage tank

Abstract

A wire exit system of a cryogenic fluid storage tank is disclosed. The wire exit system of a cryogenic fluid storage tank, according to an embodiment of the present invention, comprises: a vent line which is formed to extend from the inside of a storage tank in which a cryogenic fluid is stored and communicate with the outside of the storage tank, and through which internal gas in the storage tank can be discharged; and a wire which is electrically connected to an electronic device provided within the storage tank, wherein at least a part of the wire passes through the inside of the vent line and is connected to the outside.

Description

Wire discharge system for cryogenic fluid storage tanks

[0001] The present invention relates to a wire discharge system for a cryogenic fluid storage tank, and more particularly, to a technical idea for enabling wires, such as power cables connected to electronic devices such as various sensors or heaters, to be discharged and connected to the outside through a vent line, which is an existing essential path, without additionally drilling holes in the storage tank or forming a separate path, in a storage tank mounted on a specific transportation means (e.g., a tank lorry, a ship, etc.) for transporting a specific fluid.

[0002]

[0003] As the seriousness of energy problems caused by the use of fossil fuels becomes more evident, research into alternative fuels is actively being conducted.

[0004] Among them, the technological idea of ​​using hydrogen as a fuel is attracting attention as an alternative fuel because it is environmentally friendly and highly efficient, and its scope of application is expanding to include not only hydrogen vehicles that use hydrogen as a fuel instead of gasoline or diesel, but also small devices such as drones.

[0005] Hydrogen is distributed and stored in a liquefied state. This liquefied hydrogen is stored at extremely low temperatures and stored in storage tanks as a cryogenic fluid, such as liquefied hydrogen. This applies not only to liquefied hydrogen, but also to various other gases (e.g., nitrogen, natural gas, etc.) that are stored and transported in the form of liquefied, cryogenic fluids.

[0006] In addition to simple storage of such cryogenic fluids, a storage tank capable of storing cryogenic fluids is required for transportation of such cryogenic fluids.

[0007] For these cryogenic fluid storage tanks, it may be important to minimize external communication or contact as much as possible.

[0008] However, it is necessary to have a line that is connected to the outside, such as a filling line for filling the cryogenic fluid into the cryogenic fluid storage tank, a discharge line for discharging the cryogenic fluid, and a vent line for discharging boil-off gas generated inside the storage tank.

[0009] Meanwhile, various electronic devices, such as various sensors for measuring the level of cryogenic fluid inside the storage tank and heaters used for pressurization for smooth discharge of the stored cryogenic fluid, are installed in the cryogenic fluid storage tank.

[0010] Since wires such as power cables for power supply of these electronic devices must also be connected from inside the storage tank to an external power supply, a separate conduit structure was previously required to bring the wires outside.

[0011] As described above, if the path connecting to the outside in a cryogenic fluid storage tank increases, it becomes difficult to maintain a constant temperature inside the storage tank, and in particular, in the case of cryogenic fluid in a cryogenic state, there is a problem that it can easily vaporize even with a slight temperature increase, and the generation of boil-off gas inside the storage tank may increase.

[0012] Boil-off gas unnecessarily increases the pressure inside the cryogenic fluid storage tank and poses a risk of explosion in itself. In addition to safety issues, boil-off gas can also significantly reduce the storage or transportation efficiency of cryogenic fluids, so it may be important to suppress the generation of boil-off gas itself.

[0013] Accordingly, a technical idea is required to minimize the path connecting the inside of a cryogenic fluid storage tank to the outside, while also allowing wires such as power cables for electronic devices to be easily routed to the outside from existing storage tanks.

[0014]

[0015] * Prior art literature

[0016] - Patent literature

[0017] Patent Document 1. Korean Registered Patent (Registration No. 10-1030342, "Capacitive Water Level Detection Sensor and System")

[0018]

[0019] The problem to be solved by the present invention is to provide a technical idea that allows wires, such as power cables connected to electronic devices such as various sensors or heaters, in a cryogenic fluid storage tank in which cryogenic fluid is stored to be sent out to the outside through existing essential routes without forming a separate route.

[0020]

[0021] According to an embodiment of the present invention for solving the above technical problem, a wire discharge system of a cryogenic fluid storage tank includes a vent line formed to communicate from the inside of a storage tank in which cryogenic fluid is stored to the outside so that gas inside the storage tank can be discharged, and a wire electrically connected to an electronic device provided inside the storage tank, and at least a part of the wire may be characterized in that it passes through the inside of the vent line and is connected to the outside.

[0022] In addition, the vent line may include a feedthrough formed to penetrate the storage tank, and the wire may be characterized in that it passes through the inside of the feedthrough and is connected to the outside of the storage tank.

[0023] Additionally, the electronic device may be characterized by at least one of a level sensor, a heater, or a temperature sensor for measuring the level of the cryogenic fluid stored in the storage tank.

[0024] According to an embodiment of the present invention for solving the above technical problem, a cryogenic fluid storage tank includes an inner tank in which cryogenic fluid is stored, an outer tank formed to surround the inner tank at a predetermined interval, a vent line formed to communicate from the inside of the inner tank to the outside of the outer tank so that gas inside the inner tank can be discharged, and a wire electrically connected to an electronic device provided inside the inner tank, and at least a part of the wire may be characterized in that it passes through the inside of the vent line and is connected to the outside.

[0025]

[0026] According to one embodiment of the present invention, in a cryogenic fluid storage tank in which cryogenic fluid is stored, wires such as power cables connected to electronic devices such as various sensors or heaters can be sent out to the outside through existing essential paths without forming separate paths, thereby reducing the paths that connect the cryogenic fluid storage tank to the outside, thereby suppressing the generation of boil-off gas, thereby improving safety and increasing the storage efficiency of cryogenic fluid.

[0027]

[0028] In order to more fully understand the drawings cited in the detailed description of the present invention, a brief description of each drawing is provided.

[0029] Figure 1 shows a schematic configuration of a wire discharge system of a cryogenic fluid storage tank according to an embodiment of the present invention.

[0030] Figures 2 to 4 illustrate installation examples of electronic devices of a wire discharge system of a cryogenic fluid storage tank according to an embodiment of the present invention.

[0031] Figure 5 is a drawing for explaining a breakwater.

[0032] FIG. 6 is a drawing for explaining the installation form of a wave plate of a wave plate type level measurement system using a wire discharge system of a cryogenic fluid storage tank according to an embodiment of the present invention.

[0033] FIG. 7 and FIG. 8 are drawings for explaining a wave plate type level sensor system using a wire discharge system of a cryogenic fluid storage tank according to another embodiment of the present invention.

[0034]

[0035] The present invention is susceptible to various modifications and embodiments. Specific embodiments are illustrated in the drawings and described in detail in the detailed description. However, this is not intended to limit the present invention to specific embodiments, but rather to encompass all modifications, equivalents, and alternatives falling within the spirit and technical scope of the present invention. In describing the present invention, detailed descriptions of related known technologies will be omitted if they are deemed to obscure the gist of the present invention.

[0036] Terms such as first, second, etc. may be used to describe various components, but these components should not be limited by these terms. These terms are used solely to distinguish one component from another.

[0037] The terminology used in this application is solely for the purpose of describing specific embodiments and is not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly dictates otherwise.

[0038] In this specification, terms such as “include” or “have” are intended to specify the presence of a feature, number, step, operation, component, part or combination thereof described in the specification, but should be understood not to exclude in advance the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts or combinations thereof.

[0039] Hereinafter, the present invention will be described in detail, focusing on embodiments thereof, with reference to the attached drawings. The same reference numerals in each drawing represent the same components.

[0040] Figure 1 shows a schematic configuration of a wire discharge system of a cryogenic fluid storage tank according to an embodiment of the present invention.

[0041] Referring to FIG. 1, a wire discharge system (1) of a cryogenic fluid storage tank according to an embodiment of the present invention may include a vent line (500) penetrating the inside and the outside of a storage tank (100) in which cryogenic fluid is stored to discharge gas inside the storage tank (100), and a wire (300) connected to a predetermined electronic device (10) installed inside the storage tank (100). In addition, the wire (300) may pass through the inside of the vent line (500) and be connected to the outside. That is, the wire (300) may be discharged from the inside of the storage tank (100) to the outside of the storage tank (100) through the vent line (500).

[0042] Meanwhile, in the present specification, the storage tank (100) is for storing a predetermined fluid, and in one embodiment, the storage tank (100) may be a tank formed to store a cryogenic fluid in which a predetermined gas is liquefied, such as liquefied hydrogen. In this case, the storage tank (100) may be configured to include an inner tank (110) in which the cryogenic fluid is stored, and an outer tank (120) whose inner wall is formed to surround the inner tank (110) by being spaced apart from the outer wall of the inner tank by a predetermined distance. In this case, the space between the inner tank (110) and the outer tank (120) can maintain a vacuum state. Hereinafter, the present specification will describe a case in which the storage tank (100) is configured to include the inner tank (110) and the outer tank (120) and the cryogenic fluid is stored in the inner tank (110), but the present invention is not necessarily limited thereto. Depending on the implementation example, the storage tank (100) may be formed as a single tank, or there may be cases where physical separation of the inner tank (110) and the outer tank (120) is practically difficult, and even in such cases, the technical idea of ​​the present invention can be equally applied.

[0043] In addition, if the fluid is a cryogenic fluid as described above, the cryogenic fluid may be a liquefied gas in which a predetermined gas is liquefied. Hereinafter, the present specification will describe a case in which the cryogenic fluid is liquefied hydrogen as an example, but the scope of the present invention is not necessarily limited thereto. For example, the cryogenic fluid may be a liquefied gas in which various types of gases are liquefied, such as liquid nitrogen or liquid helium.

[0044] In addition, the cryogenic fluid may be a liquefied gas in which a predetermined gas is liquefied as described above. Hereinafter, the present specification will describe a case in which the cryogenic fluid is liquefied hydrogen as an example, but the scope of the present invention is not necessarily limited thereto. For example, the cryogenic fluid may be a liquefied gas in which various types of gases are liquefied, such as liquid nitrogen, liquid helium, etc. Of course, depending on the implementation example, even if the fluid stored in the storage tank (100) is a room temperature fluid rather than a cryogenic fluid, it will be easily inferred by an average expert in the technical field to which the present invention pertains that the technical idea of ​​the present invention, which will be described later, can be equally applied.

[0045] In addition, the electronic device (10) is a device that receives power and performs a predetermined function, and can be implemented in various forms as needed, and the wire (300) may refer to various types of cables, such as a power cable that is electrically connected to the electronic device (10) to supply power to the electronic device (10), and / or a data cable or communication cable for transmitting and receiving a control signal for controlling the electronic device (10). This wire (300) may be connected to a predetermined power supply device (not shown) outside the storage tank (100) and / or a predetermined control system (not shown) for controlling the operation of the electronic device (10).

[0046] In one embodiment, the electronic device (10) may refer to various sensors, such as a level measurement sensor required to measure the level (water level) of the cryogenic fluid stored inside the storage tank (100), or a temperature sensor for measuring the temperature inside the storage tank (100).

[0047] According to an implementation example, the electronic device (10) may be a heater for increasing the temperature of the cryogenic fluid stored inside the storage tank (100) to promote rapid vaporization.

[0048] An example of the above electronic device (10) will be described with reference to FIGS. 2 and 3.

[0049] Figures 2 to 4 illustrate installation examples of electronic devices of a wire discharge system of a cryogenic fluid storage tank according to an embodiment of the present invention.

[0050] First, in the case of FIG. 2, the wire discharge system (1) of the cryogenic fluid storage tank may be equipped with a capacitance level sensor (11) as a level sensor for measuring the level (water level) of the cryogenic fluid inside the storage tank (100), and in this case, the capacitance level sensor (11) may be the electronic device (10).

[0051] The above capacitance level sensor (10) may be implemented in a form widely used in the past, but may also be implemented in the form of a wave plate type level sensor depending on the implementation example. This will be described later.

[0052] In the case of Fig. 3, the electronic device (10) may be implemented in the form of a heater (12). In this case, the electronic device (10) may be installed in the form of a heater rod inside the storage tank (100) as shown in the drawing.

[0053] According to an implementation example, even if the electronic device (10) is in the form of a superconducting level sensor, it may be implemented in a rod shape or a bar shape as shown in FIG. 3.

[0054] In the case of Fig. 4, the electronic device (10) may be implemented in the form of a temperature sensor (13) capable of detecting the temperature inside the storage tank (100).

[0055] The above temperature sensor (13) may be installed in a form attached to a separate structure (e.g., a rod, a bar, etc.) having a predetermined thickness and length as shown in the drawing, and depending on the implementation example, may be installed on a breakwater installed inside the storage tank (100) or on the inner wall of the storage tank (100).

[0056] Although each drawing illustrates an installation example in which one type of electronic device (10) is installed, multiple electronic devices (10) and / or multiple types of devices may be installed together, as needed. For example, a capacitance level sensor (11) and a temperature sensor (13) may be installed together in the storage tank (100), or a heater (12) and a superconducting level sensor may be installed together. In such cases, it goes without saying that the wires (300) connected to each device may be connected to the outside through the vent line (500) according to the technical concept of the present invention.

[0057] In any case, the electronic device (10) may be connected to an external power supply device and / or a predetermined control system for controlling the operation of the electronic device (10) through the wire (300) inside the storage tank (100). In the following description, the electronic device (10) is a level sensor for measuring the level of the cryogenic fluid, and the wire (300) is a power cable for supplying power to the level sensor, but the present invention is not necessarily limited thereto.

[0058] As is generally known, the wire (300) must be connected from the inside of the inner tank (110) to an external control system (not shown), and for this purpose, the wire (300) needs to penetrate both the inner tank (110) and the outer tank (120).

[0059] The above vent line (500) may refer to a line that penetrates from the inside to the outside of the storage tank (100) to discharge gas, for example, boil-off gas, within the storage tank (100). In one embodiment of the present invention, the vent line (500) may be implemented in the form of a feedthrough (e.g., a coaxial feedthrough), but is not necessarily limited thereto.

[0060] According to the technical idea of ​​the present invention, the wires (300) connected to the electronic device (10) can be implemented so that they are received in the vent line (500), for example, the feedthrough, so that the wires (300) pass through the inside of the feedthrough provided to penetrate the inner tank (110) and the outer tank (120) and are connected to the outside of the storage tank (100).

[0061] In this case, compared to the conventional method of installing a device for fixing the pierced wire (300) and a hole in the inner tank (110) and the outer tank (120) for only penetrating the wire (300), the welding points for the inner tank (110) and the outer tank (120) are minimized, thereby reducing damage to the vacuum layer formed between the outer wall of the inner tank (110) and the inner wall of the outer tank (120), thereby improving the stability of the storage tank (100).

[0062] Hereinafter, an example will be described in which the electronic device (10) is implemented as a wave plate-type level sensor formed in the shape of a wave plate as described above, and can perform the functions of a wave plate and level measurement together.

[0063] In the above inner tank (110), according to the technical idea of ​​the present invention described above, a first wave plate (210) and a second wave plate (220) can be arranged and joined at a predetermined standard interval through an insulator (400), and a wire (300) electrically connected to the first wave plate (210) and the second wave plate (220) can be provided.

[0064] The breakwater (200) illustrated in the drawing may be in the form of a general breakwater installed inside the storage tank (100) when the storage tank (100) in which the fluid is stored is formed in a cylindrical shape, i.e., when the cross-section of the storage tank (100) is circular.

[0065] These wave plates (200) may have a plurality of holes formed therein through which the fluid can move while suppressing the flow of the fluid inside the storage tank (100), as illustrated in the drawing. Typically, the wave plates (200) are formed of a metal material and can conduct electricity, so that, as in the technical concept of the present invention described later, current can be passed through the wave plates (200) to perform the same or similar function as a conventional electrostatic capacitance level sensor. A wave plate-type level measurement system using such a wave plate (200) will be described with reference to FIGS. 5 and 6.

[0066] FIG. 5 is a drawing for explaining a breakwater, and FIG. 6 is a drawing for explaining a breakwater installation form of a breakwater type level measurement system that applies a wire discharge system of a cryogenic fluid storage tank according to an embodiment of the present invention.

[0067] Referring to the drawings, a wave plate type level sensor system according to an embodiment of the present invention may include a storage tank (100) in which a fluid is stored, a plurality of wave plates (200) provided inside the storage tank (100), and / or a wire (300) connected to a first wave plate (210) and a second wave plate (220) adjacent to each other among the plurality of wave plates to transmit power supplied from a predetermined control system (not shown).

[0068] At this time, the first wave plate (210) and the second wave plate (220) are arranged so that the distance between them is within a certain standard distance, as shown in FIG. 6, and can be implemented to measure the level of the fluid flowing in the space between the first wave plate (210) and the second wave plate (220).

[0069] The principle of a typical capacitive level sensor is that when a substance partially exists between two plates through which current flows, the capacitance of the two plates, which act as a capacitor, can change depending on the amount of the substance. Since capacitive level sensors are already widely known, a further detailed description is omitted in this specification.

[0070] The wave plate type level measurement system uses the principle of the electrostatic capacitance type level sensor and can measure the level of the fluid in the storage tank (100) by using a wave plate formed in the shape of a metal plate without having a separate level sensor such as a conventional cylindrical level sensor.

[0071] In the case of cryogenic fluids such as liquefied hydrogen, the dielectric constant is extremely low compared to general liquids such as water, and therefore, the distance between the wave plates (200) that function as the above-described positive equilibrium plates, i.e., the first wave plate (210) and the second wave plate (220), must be within a certain standard distance to obtain meaningful measured values. The standard distance may be, for example, 1 cm or several cm, and may be determined in various ways as needed within a range in which a calculated value for measuring the level of the cryogenic fluid can be meaningfully derived.

[0072] Meanwhile, although not shown in the drawing, a predetermined control system (not shown) may be provided that is connected to a wire (300) that is connected to the first wave plate (210) and the second wave plate (220) and extends to the outside of the storage tank (100), supplies current to the first wave plate (210) and the second wave plate (220), measures the electrostatic capacity measured thereby, and consequently measures the fluid level in the storage tank (100).

[0073] The above control system (not shown) can perform the function of controlling the operation of operations and other components for implementing the technical idea of ​​the present invention, and for this purpose, the control system (not shown) can be configured to include a processor, a storage device, and a predetermined program stored in the storage device and executed by the processor. In this specification, when the control system (not shown) performs a predetermined operation (e.g., level measurement, power supply, etc.), it can be easily inferred by an average expert in the technical field of the present invention that this can be performed by a series of data processing and / or control performed by the processor executing the program.

[0074] For example, the control system (not shown) may be configured to include a predetermined power supply for applying power to the first wave plate (210) and the second wave plate (220) for measuring the level of the cryogenic fluid.

[0075] In addition, the control system (not shown) may be configured to include a capacitance measuring means for measuring the capacitance of the first breakwater (210) and / or the second breakwater (220), and a calculation means (processor) for ultimately measuring the level of the cryogenic fluid based on the change in the capacitance. Depending on the implementation example, the control system (not shown) may further include a predetermined storage device for pre-storing the change in the capacitance value according to the storage capacity of the storage tank (100) or the amount of fluid in the storage tank (100). The control system (not shown) may perform the function of controlling the operation of calculations and other components for implementing the technical idea of ​​the present invention, and for this purpose, the control system (not shown) may be configured to include a processor, a storage device, and a predetermined program stored in the storage device and executed by the processor. In this specification, when the control system (not shown) performs a predetermined operation (e.g., level measurement, power supply, etc.), an average expert in the technical field of the present invention can easily infer that this can be performed by a series of data processing and / or control performed by the processor executing the program.

[0076] The above control system (not shown) may also mean a system that can supply appropriate power or control the operation of the device depending on the type of the electronic device (10), even when the electronic device (10) is implemented in the form of a superconducting level sensor, temperature sensor, or heater described in FIG. 2 and / or FIG. 3, in addition to the case where the electronic device (10) is a wave-type level sensor described above.

[0077] Meanwhile, in order to measure the electrostatic capacity according to the amount of fluid by applying power to the first wave plate (210) and the second wave plate (220) as described above, the first wave plate (210) and the second wave plate (220) need to be insulated.

[0078] Accordingly, the edge or at least a portion of the edge of the first wave plate (210) and / or the second wave plate (220) can be coupled to the inner wall of the storage tank (100) through a predetermined insulator (400).

[0079] The above insulator (400) may be formed of a material having relatively high thermal stability, such as PTFE (Polytetrafluoroethylene) or G10, but is not necessarily limited thereto, and may be formed of any material as long as it can insulate and couple the first wave plate (210) and the second wave plate (220) and the inner wall of the storage tank (100), and can withstand conditions such as the temperature of the fluid stored in the storage tank (100), depending on the type of fluid.

[0080] In the drawing, the insulator (400) is shown as being provided only on the upper and lower parts of the inner wall of the storage tank (100), but this is to facilitate the explanation of the present invention, and the insulator (400) may be implemented to cover only a part of the edge of the first breakwater plate (210) and / or the second breakwater plate (220) as shown in the drawing, but depending on the implementation example, it may be implemented to cover the entire edge of the first breakwater plate (210) and / or the second breakwater plate (220).

[0081] In any case, the first breakwater plate (210) and / or the second breakwater plate (220) must not be in direct contact with the inner wall of the storage tank (100) and must be insulated from the storage tank (100), so the insulator (400) serves to fix the first breakwater plate (210) and / or the second breakwater plate (220) to the inside of the storage tank (100). Considering the role of the breakwater plates (200), the first breakwater plate (210) and / or the second breakwater plate (220) are also subjected to external force or impact by the fluid flowing inside the storage tank (100), and an excessively narrow joint portion may cause damage or detachment of the breakwater plates. Accordingly, it may be desirable for the insulator (400) to be bonded to a degree that it can sufficiently fix the edges of the first wave plate (210) and / or the second wave plate (220) so that damage or detachment of the first wave plate (210) and / or the second wave plate (220) does not occur due to the flow of fluid.

[0082] FIG. 7 and FIG. 8 are drawings for explaining a wave plate type level sensor system using a wire discharge system of a cryogenic fluid storage tank according to another embodiment of the present invention.

[0083] Referring to FIGS. 7 and 8, a wave plate type level sensor system to which a wire discharge system (1) of a cryogenic fluid storage tank according to another embodiment of the present invention can be applied can be implemented in a form in which at least two metal sensing units (600) are attached to a first wave plate (210), which is one of the wave plates (200) installed in the storage tank (100) as described above. In the present specification, a case in which the metal sensing units (600) are formed in the form of a pair of metal rods (e.g., 610, 620) is described as an example, but the present invention is not necessarily limited thereto. The metal sensing units (600) can be formed in various forms such as a metal plate shape or a cylindrical shape as well as the form of the metal rods (e.g., 610, 620) described above as long as they have a certain area and can face each other. In any case, the metal sensing unit (600) may be configured such that the surfaces having a predetermined area face each other and the level of the fluid can be measured through the space between the surfaces where each metal sensing unit (600) faces each other.

[0084] As shown in the drawing, the metal sensing unit (600), for example, metal rods (e.g., 610, 620), may be installed on one side of the first wave plate (210) so as to have a spacing within the reference spacing.

[0085] At this time, since the general wave plates (200) are formed of a metal material as described above, the first wave plate (210) and the metal rods (e.g., 610, 620) must also be insulated so that the level of the fluid stored in the storage tank (100) can be measured. Accordingly, one surface of the first wave plate (210) and the joining portion of the metal rods (e.g., 610, 620) can be joined through an insulator (400) as described above.

[0086] According to this embodiment of the present invention, the level of the fluid in the storage tank (100) can be easily measured by attaching a metal sensing unit (600) to one of the plurality of wave plates (200) provided in the storage tank (100) (e.g., the first wave plate (210)), thereby greatly improving the ease of installation and the space utilization in the storage tank (100).

[0087] Regardless of the form of the electronic device (10) installed in the storage tank (100), according to the technical idea of ​​the present invention, in order to discharge the wire (300) connected to the electronic devices (10) installed in the storage tank (100) to the outside, without a separate hole for discharging the wire (300) in the storage tank (100) as in the past, a vent line (500) formed to communicate with the inside and outside of the storage tank (100) for discharging boil-off gas can be used, thereby achieving advantageous effects such as durability of the storage tank (100), storage efficiency of cryogenic fluid, and reduction of boil-off gas generation.

[0088] The foregoing description of the present invention is for illustrative purposes only, and those skilled in the art will readily appreciate that the present invention can be readily modified into other specific forms without altering the technical spirit or essential characteristics of the present invention. Therefore, the embodiments described above should be understood as illustrative in all respects and not restrictive. For example, each component described as a single entity may be implemented in a distributed manner, and similarly, components described as distributed may be implemented in a combined manner.

[0089] The scope of the present invention is indicated by the claims described below rather than the detailed description above, and all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts should be interpreted as being included in the scope of the present invention.

[0090]

[0091] The present invention can be used in a wire discharge system of a cryogenic fluid storage tank.

Claims

1. A vent line formed to communicate from the inside of a storage tank where cryogenic fluid is stored to the outside so that gas inside the storage tank can be discharged; and It includes a wire electrically connected to an electronic device provided inside the above storage tank, At least a portion of said wire, A wire discharge system for a cryogenic fluid storage tank, characterized in that it passes through the inside of the above vent line and is connected to the outside.

2. In the first paragraph, the vent line is It includes a feedthrough formed to penetrate the above storage tank, A wire discharge system for a cryogenic fluid storage tank, characterized in that the wire passes through the interior of the feedthrough and is connected to the exterior of the storage tank.

3. In the first paragraph, the electronic device, A wire discharge system for a cryogenic fluid storage tank, characterized by at least one of a level sensor, a heater, or a temperature sensor for measuring the level of the cryogenic fluid stored in the storage tank.

4. An inner tank where cryogenic fluid is stored; An outer tank formed to surround the inner tank at a predetermined interval; A vent line formed to communicate from the inside of the inner tank to the outside of the outer tank so that gas inside the inner tank can be discharged; and It includes a wire that is electrically connected to an electronic device provided inside the above-mentioned inner tank, At least a portion of said wire, A cryogenic fluid storage tank characterized in that it is connected to the outside through the inside of the above vent line.

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