KR102688520B1 - Liquid hydrogen charging system using cryogenic flexible pipe and method for charging liquid hydrogen using the same - Google Patents

Abstract

In the liquid hydrogen charging system using cryogenic flexible piping and the liquid hydrogen charging method using the same, the liquid hydrogen charging system includes a storage tank, a reliquefaction unit, a pair of first and second pipes, a recovery pipe, a first valve unit, and a first valve unit. Includes 2 valve units. The storage tank stores liquid hydrogen. The re-liquefaction unit is connected to a storage tank and re-liquefies gaseous hydrogen into liquid hydrogen. The first and second pipes are connected between the mobility and the storage tank. The recovery pipe is connected between the mobility and the reliquefaction unit. The first valve unit simultaneously controls the first pipe and the recovery pipe. The second valve unit controls the second pipe.

Description

Liquid hydrogen charging system using cryogenic flexible piping and liquid hydrogen charging method using the same {LIQUID HYDROGEN CHARGING SYSTEM USING CRYOGENIC FLEXIBLE PIPE AND METHOD FOR CHARGING LIQUID HYDROGEN USING THE SAME}

The present invention relates to a liquid hydrogen charging system using cryogenic flexible piping and a liquid hydrogen charging method using the same. More specifically, liquid hydrogen can be stably supplied to mobility where liquid hydrogen is used, and charging and recovery of liquid hydrogen is possible. This relates to a liquid hydrogen charging system using cryogenic flexible piping, which is easy to minimize the consumption of liquid hydrogen, and a liquid hydrogen charging method using the same.

Recently, various technologies using hydrogen, an eco-friendly fuel, as an energy source have been developed, and its importance is increasing in a situation where carbon neutrality is accelerating.

Accordingly, the development of technology to use hydrogen as an energy source in various mobility such as vehicles, railway vehicles, airplanes, ships, etc. is accelerating, and related research is also actively underway.

In particular, in systems that require large amounts of hydrogen as an energy source, or in the case of mobility that requires high output and long distance movement, liquid hydrogen, which has a higher energy density compared to gaseous hydrogen, is expected to be mainly used.

In the case of liquid hydrogen charging for such mobility, it is mostly carried out at a charging station, and at the charging station, a system that supplies liquid hydrogen in one direction from a storage tank to the mobility is generally used.

That is, US Patent Publication No. 2021-0155108 discloses the concept of charging hydrogen and fuel cells to mobility through a mobile charging station, but only discloses a one-way charging system from the charging station to mobility.

However, in the charging of liquid hydrogen, there is a risk of safety accidents due to system instability with a simple one-way charging system, and there is a limitation that recycling of liquid hydrogen is difficult.

US Patent Publication No. 2021-0155108

Accordingly, the technical problem of the present invention was conceived from this point, and the purpose of the present invention is to stably supply liquid hydrogen to mobility where liquid hydrogen is used, and to minimize the consumption of liquid hydrogen by making it easy to charge and recover liquid hydrogen. The goal is to provide a liquid hydrogen charging system using cryogenic flexible piping.

In addition, another object of the present invention is to provide a liquid hydrogen charging method using the liquid hydrogen charging system.

The liquid hydrogen charging system according to an embodiment for realizing the object of the present invention described above includes a storage tank, a reliquefaction unit, a pair of first and second pipes, a recovery pipe, a first valve unit, and a second valve unit. Includes. The storage tank stores liquid hydrogen. The re-liquefaction unit is connected to a storage tank and re-liquefies gaseous hydrogen into liquid hydrogen. The first and second pipes are connected between the mobility and the storage tank. The recovery pipe is connected between the mobility and the reliquefaction unit. The first valve unit simultaneously controls the first pipe and the recovery pipe. The second valve unit controls the second pipe.

In one embodiment, liquid hydrogen from the storage tank is supplied to the mobility through the first pipe, and the remaining amount of liquid hydrogen remaining in the mobility is recovered to the storage tank through the second pipe, and the recovery Gaseous hydrogen generated in the mobility can be recovered to the re-liquefaction unit through the pipe.

In one embodiment, in the first valve unit, the first pipe and the recovery pipe extend a predetermined distance apart from each other, and the first valve unit includes a vacuum portion filled between the first pipe and the recovery pipe. may include.

In one embodiment, in the first valve unit, the first pipe extends from the center, the return pipe extends from the outside of the first pipe, and the first valve unit includes the first pipe and the return pipe. It may include an insulation portion formed between pipes, and a vacuum portion filled outside the recovery pipe.

In one embodiment, each of the first and second valve units may be a check valve.

In one embodiment, each of the first and second valve units may be a plug-in valve that attaches and detaches the liquid hydrogen charging system to the mobility.

In one embodiment, it may further include a third pipe connected between the storage tank and the reliquefaction unit, and a reliquefaction pipe connected between the reliquefaction unit and the storage tank.

In one embodiment, gaseous hydrogen from the storage tank may be supplied to the re-liquefaction unit through the third pipe, and liquid hydrogen liquefied in the re-liquefaction unit may be supplied to the storage tank through the re-liquefaction unit.

In one embodiment, it further includes a fuel cell connected between the mobility and the reliquefaction unit, and a switching valve is provided on the recovery pipe, so that recovery to the reliquefaction unit or the fuel cell can be selected.

In the liquid hydrogen charging method according to an embodiment for realizing another object of the present invention described above, the remaining amount of liquid hydrogen remaining in the mobility is recovered to the storage tank through the second valve unit and the second pipe. Liquid hydrogen stored in the storage tank is supplied to the mobility through a first pipe and a first valve unit. Gaseous hydrogen generated due to cooling and charging in the mobility is recovered to the reliquefaction unit through the first valve unit and recovery pipe. The gaseous hydrogen recovered in the re-liquefaction unit is re-liquefied and supplied to the storage tank.

In one embodiment, the gaseous hydrogen in the storage tank is supplied to the reliquefaction unit through a third pipe, and the liquid hydrogen reliquefied in the reliquefaction unit may be supplied to the storage tank.

In one embodiment, the step of supplying liquid hydrogen from the storage tank to the mobility and the step of recovering the gaseous hydrogen of the mobility to the re-liquefaction unit are simultaneously controlled by the first valve unit, and the remaining amount of liquid hydrogen of the mobility is controlled simultaneously. The recovery step may be controlled by the second valve unit.

According to embodiments of the present invention, liquid hydrogen can be simply charged through a plug-in type valve unit between the mobility and charging system, thereby improving usability.

In particular, through the first valve unit, gaseous hydrogen generated by cooling and charging of the mobility can be immediately recovered along with the charging of liquid hydrogen, so charging and recovery can be performed simultaneously to provide a stable supply of liquid hydrogen. In this case, since the charging and recovery pipes in the first valve unit are connected to each other in an insulated state, heat exchange between liquid hydrogen and gaseous hydrogen may be blocked.

Furthermore, through the second valve unit, the remaining amount of liquid hydrogen in the mobility can be recovered to the storage tank, thereby minimizing energy waste by minimizing the consumption of liquid hydrogen.

In addition, energy waste can be minimized by liquefying gaseous hydrogen through the re-liquefaction unit and supplying it back to the storage tank.

In this case, in addition to recovery to the re-liquefaction unit, the electricity required by the fuel cell can be directly produced by being recovered to the fuel cell, thereby further improving the efficiency of energy utilization.

Figure 1 is a schematic diagram showing a liquid hydrogen charging system according to an embodiment of the present invention.
FIG. 2A is an example of a cross-sectional view showing the first valve unit of FIG. 1, and FIG. 2B is another example of a cross-sectional view showing the first valve unit of FIG. 1.
FIG. 3 is a cross-sectional view showing the first or second pipe of FIG. 1.
Figure 4 is a flow chart showing a liquid hydrogen charging method using the liquid hydrogen charging system of Figure 1.
Figure 5a is a schematic diagram showing the steps of supplying liquid hydrogen to mobility and recovering gaseous hydrogen from mobility in Figure 4.
Figure 5b is a schematic diagram showing the step of re-liquefying and supplying the gaseous hydrogen recovered in Figure 4 and the step of recovering the remaining amount of liquid hydrogen for mobility.

Since the present invention can be subject to various changes and can have various forms, embodiments will be described in detail in the text. However, this is not intended to limit the present invention to a specific disclosed form, and should be understood to include all changes, equivalents, and substitutes included in the spirit and technical scope of the present invention. While describing each drawing, similar reference numerals are used for similar components. Terms such as first, second, etc. may be used to describe various components, but the components should not be limited by the terms.

The above terms are used only for the purpose of distinguishing one component from another. The terms used in this application are only used to describe specific embodiments and are not intended to limit the invention. Singular expressions include plural expressions unless the context clearly dictates otherwise.

In this application, terms such as “comprise” or “consist of” are intended to designate the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, but are not intended to indicate the presence of one or more other features. It should be understood that this does not exclude in advance the possibility of the existence or addition of elements, numbers, steps, operations, components, parts, or combinations thereof.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by a person of ordinary skill in the technical field to which the present invention pertains. Terms defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related technology, and unless explicitly defined in the present application, should not be interpreted in an ideal or excessively formal sense. No.

Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the attached drawings.

Figure 1 is a schematic diagram showing a liquid hydrogen charging system according to an embodiment of the present invention.

Referring to FIG. 1, the liquid hydrogen charging system 10 according to this embodiment may be a charging station that performs charging for the mobility 20.

In this case, the liquid hydrogen charging system 10 is a fixed charging station that receives liquid hydrogen (LH ₂ ) through a mobile storage unit 600, for example, a tank lorry, and supplies the liquid hydrogen to the mobility 20. Charging can be performed.

In contrast, the liquid hydrogen charging system 10 is a mobile charging station, which moves together with the mobile storage unit 600 and can charge liquid hydrogen into the mobility 20 at a necessary location.

The mobility 20 is a system that requires large amounts of hydrogen as an energy source, such as vehicles, railroad cars, airplanes, ships, etc., or a transportation method that requires high output and long-distance movement, and uses high-density liquid hydrogen as an energy source. is sufficient, and the target is not limited.

Specifically, the liquid hydrogen charging system 10 includes a storage tank 100, a pump unit 200, a first valve unit 300, a second valve unit 400, a reliquefaction unit 500, and a fuel cell 700. ) and includes a plurality of pipes connecting the components to each other.

The storage tank 100 is a storage space for storing liquid hydrogen (LH ₂ ) (110). The storage tank 100 has an insulating structure insulated from the outside, and liquid is supplied from the external mobile storage unit 600. A separate configuration is provided to receive hydrogen.

In this case, the liquid hydrogen (110) stored in the storage tank (100) may be vaporized into gaseous hydrogen (GH ₂ ) (120) by self-evaporation, etc., and accordingly, the liquid hydrogen (110) is stored in the storage tank (100). ) In addition, gaseous hydrogen 120 can also be stored.

However, this gaseous hydrogen 120 is not supplied to the mobility 20, but is provided to the reliquefaction unit 500 through the third pipe 103.

The reliquefaction unit 500 reliquefies the supplied gaseous hydrogen 120 into liquid hydrogen 110, and the reliquefied liquid hydrogen 110 is stored in the reliquefaction unit 500 and the storage tank 100. ) is provided back to the storage tank 100 through the reliquefaction pipe 501 connected between them. Thus, waste of liquid hydrogen can be minimized.

In this case, the fuel cell 700 may be additionally connected in parallel on the third pipe 103 connected to the reliquefaction unit 500.

Additionally, a switching valve 104 may be provided at the branch point to the fuel cell 700.

Thus, the gaseous hydrogen 120 generated in the storage tank 100 may be directly supplied to the fuel cell 700 through the third pipe 103. That is, it can be supplied to the fuel cell 700 or recovered to the reliquefaction unit 500 according to the operation of the switching valve 104.

In this case, the switching valve 104 may be operated to selectively provide the gaseous hydrogen 120 to the reliquefaction unit 500 or the fuel cell 700, but otherwise, the gaseous hydrogen 120 It may be operated to provide the fuel to the reliquefaction unit 500 and the fuel cell 700 at the same time.

The storage tank 100 is connected to the first valve unit 300 through a first pipe 101, and the pump unit 200 is provided on the first pipe 101.

The liquid hydrogen 110 is supplied to the mobility 20 when the first valve unit 300 is connected to the mobility 20. In this case, the pump unit 200 is connected to the first pipe ( The liquid hydrogen 110 supplied to the mobility 20 through 101) is pressurized.

Thus, the liquid hydrogen 110 can be stably supplied to the mobility 20.

The first valve unit 300 is a check valve, and at the same time, it is a plug-in valve for attaching and detaching the liquid hydrogen charging system 10 to the mobility 20.

In this case, the first valve unit 300 is connected to the first pipe 101 described above and is also connected to the recovery pipe 303.

The recovery pipe 303 is a pipe connecting the mobility 20 and the reliquefaction unit 500, and recovers gaseous hydrogen 120 generated in the mobility 20 to the reliquefaction unit 500.

That is, in the case of the mobility 20, a large amount of gaseous hydrogen 120 may be generated while being charged with the liquid hydrogen 110 and performing necessary cooling. Accordingly, in the case of gaseous hydrogen 120 generated in the mobility 20, a separate processing unit is not provided inside the mobility 20, so the reliquefaction unit 500 of the liquid hydrogen charging system 10 It is recovered and reliquefied.

Therefore, energy can be saved by improving the recyclability of liquid hydrogen through re-liquefaction of gaseous hydrogen generated in the mobility 20.

In this case, the fuel cell 700 may be additionally connected in parallel on the recovery pipe 303 connected to the reliquefaction unit 500.

Additionally, a switching valve 304 may be provided at the branch point to the fuel cell 700.

Thus, the gaseous hydrogen 120 generated in the mobility 20 may be recovered through the recovery pipe 303 and directly supplied to the fuel cell 700. That is, it can be supplied to the fuel cell 700 or recovered to the reliquefaction unit 500 according to the operation of the switching valve 304.

In this case, the switching valve 304 may be operated to selectively provide the gaseous hydrogen 120 to the reliquefaction unit 500 or the fuel cell 700, but in contrast, the gaseous hydrogen 120 may be operated to provide the gaseous hydrogen 120 to the fuel cell 700. It may be operated to provide the fuel to the reliquefaction unit 500 and the fuel cell 700 at the same time.

When the gaseous hydrogen 120 is directly provided to the fuel cell 700 by the operation of the conversion valve 304, the fuel cell 700 can directly produce electric energy, etc., thereby increasing the efficiency of energy utilization. It can be improved.

Meanwhile, the fuel cell 700 may be a fuel cell installed in a device that requires separate mobility or separate electrical energy production, and the electrical energy produced in this way can be provided to the mobility 20.

As described above, the first valve unit 300 must have a plug-in valve shape, and a supply line for liquid hydrogen 110 and a recovery line for gaseous hydrogen 120 must be formed simultaneously therein.

Accordingly, the first valve unit 300 includes a first charging pipe 301 through which the supply line of the liquid hydrogen 110 extends and is connected to the mobility 20, and a recovery line of the gaseous hydrogen 120. A first recovery pipe 302 extending from and connected to the mobility 20 must be provided.

Thus, when the first valve unit 300 is mounted on the mobility 20 and the conduit inside the first valve unit 300 is opened, charging of liquid hydrogen into the mobility 20 begins. The gaseous hydrogen generated during the charging process is also recovered.

Meanwhile, the detailed internal structure of the first valve unit 300 will be described later with reference to FIGS. 2A and 2B.

The second valve unit 400 is a valve to which the second pipe 102, which is another pipe connecting the storage tank 100 and the mobility 20, is connected, and the second valve unit 400 is also checked. It is a check valve, and at the same time, it is a plug-in valve that attaches and detaches the liquid hydrogen charging system 10 to the mobility 20.

However, the second valve unit 400 is connected to only one second valve 400, and therefore, in the case of the second valve unit 400, it extends additionally to the second valve 400 and provides the mobility ( It is sufficient if a second recovery pipe 401 connected to 20) is provided.

In this case, the second recovery pipe 401 and the second pipe 102 are pipes that recover the remaining amount of liquid hydrogen used in the mobility 20 to the storage tank 100.

That is, the mobility 20 may be filled with liquid hydrogen 110 and a pressure increase may occur due to the remaining liquid hydrogen, and the remaining amount of liquid hydrogen may be separately processed inside the mobility 20. Since there is no system available, it must be recovered through the liquid hydrogen charging system (10).

For this purpose, the second valve unit 400 and the second pipe 102 are provided, and the remaining amount of liquid hydrogen is recovered to the storage tank 100 through the second pipe 102, through which It improves the stability of mobility while minimizing waste of liquid hydrogen.

As described above, when the second valve unit 400 is mounted on the mobility 20 and the conduit inside the second valve unit 400 is opened, the remaining amount of liquid in the mobility 20 Hydrogen is recovered into the storage tank 100.

As described above, the reliquefaction unit 500 not only reliquefies the gaseous hydrogen 120 recovered from the storage tank 100 through the third pipe 103, but also reliquefies the gaseous hydrogen 120 recovered from the storage tank 100 through the third pipe 103. Re-liquefaction is also performed on the recovered gaseous hydrogen 120.

Thus, the liquid hydrogen reliquefied in the reliquefaction unit 500 is re-supplied to the storage tank 100 through the reliquefaction pipe 501.

FIG. 2A is an example of a cross-sectional view showing the first valve unit of FIG. 1, and FIG. 2B is another example of a cross-sectional view showing the first valve unit of FIG. 1.

First, referring to FIG. 2A, in the case of the first valve unit 300, there is a first pipe 101 through which liquid hydrogen is supplied, a first charging pipe 301 connected thereto, and a first valve unit 300 through which gaseous hydrogen is recovered. A recovery pipe 303 and a first recovery pipe 302 connected thereto must be provided.

However, the first pipe 101 and the first charging pipe 301 are pipes through which liquid hydrogen passes, and the recovery pipe 303 and the first recovery pipe 302 are pipes through which gaseous hydrogen passes, and are insulated. This is essential.

Accordingly, as shown in FIG. 2A, the first pipe 101/first charging pipe 301 and the recovery pipe 303/first recovery pipe 302 are arranged to be spaced apart from each other by a predetermined distance, and the A vacuum portion 310 of a predetermined area is formed not only in the space but also outside.

Thus, insulation is performed through the vacuum part 310.

Meanwhile, the first pipe 101/first charging pipe 301, as well as the recovery pipe 303/first recovery pipe 302, are all flexible conduits, and accordingly, the first valve unit Connection and disconnection with the mobility 20 through 300 can be easily performed.

In contrast, referring to FIG. 2b, pipes provided inside the first valve unit 350 may be extended into a different structure.

That is, the first pipe 101/first charging pipe 301 extends through the center of the first valve unit 350, and the first pipe 101/first charging pipe 301 An insulating portion 320 having a predetermined thickness covers the outer surface of .

In addition, the recovery pipe 303/first recovery pipe 302 extends to have a predetermined thickness along the outer surface of the insulation portion 320, and the recovery pipe 303/first recovery pipe 302 A vacuum portion 330 having a predetermined thickness is formed on the outer surface.

Therefore, as shown in Figure 2b, in a concentric structure, the first pipe 101/first filling pipe 301, the insulation portion 320, the recovery pipe 303/first recovery pipe 302, And the vacuum portion 330 is formed sequentially.

Thus, the vacuum unit 330 can perform insulation from the outside, and the insulation unit 320 can perform the insulation between gaseous hydrogen and liquid hydrogen inside.

In this case, as shown in FIG. 2A, the first pipe 101/first filling pipe 301 as well as the recovery pipe 303/first recovery pipe 302 are all flexible conduits.

As described above, one first valve unit 300 may be designed to supply liquid hydrogen and recover gaseous hydrogen by forming a pair of conduits inside to insulate each other. Although not shown, a separate valve unit 300 may be designed to supply liquid hydrogen and recover gaseous hydrogen. An on/off switch, etc. may be provided to control the supply of liquid hydrogen or recovery of gaseous hydrogen.

FIG. 3 is a cross-sectional view showing the first or second pipe of FIG. 1.

Referring to FIG. 3, a cross section of any first pipe 101 to which the first valve unit 300 is not connected or any second pipe 102 to which the second valve unit 400 is not connected. This is shown.

That is, in the case of the first pipe 101 as well as the second pipe 102, a conduit 210 through which liquid hydrogen passes is formed on the inside, and a vacuum part that insulates the conduit 210 from the outside is formed on the outside. (220) is formed.

In this case, both the first pipe 101 and the second pipe 102 may be flexible pipes.

Furthermore, in the cross section of FIG. 3, in addition to the first pipe or the second pipe, the recovery pipe 303 may also have the same structure in a portion where the first valve unit 300 is not connected.

Below, a liquid hydrogen charging method using the liquid hydrogen charging system 10 will be described.

Figure 4 is a flow chart showing a liquid hydrogen charging method using the liquid hydrogen charging system of Figure 1. Figure 5a is a schematic diagram showing the steps of supplying liquid hydrogen to mobility and recovering gaseous hydrogen from mobility in Figure 4. Figure 5b is a schematic diagram showing the step of re-liquefying and supplying the gaseous hydrogen recovered in Figure 4 and the step of recovering the remaining amount of liquid hydrogen for mobility.

First, in the liquid hydrogen charging method, referring to FIGS. 4 and 5A, the first valve unit 300 is mounted on the mobility 20, and the first valve unit 300 is turned on.

Meanwhile, in the case of the mobility 20, a residual amount of liquid hydrogen may be generated during operation, and if liquid hydrogen is additionally supplied while the remaining amount of liquid hydrogen exists in the mobility 20, the remaining amount of liquid Problems with hydrogen evaporation may occur.

Therefore, in the liquid hydrogen charging method according to this embodiment, first, the remaining amount of liquid hydrogen in the mobility 20 is transferred to the storage tank ( 100) and recovered (step S10).

Thus, when all the liquid hydrogen remaining in the mobility 20 is recovered, as shown in FIG. 5B, the liquid hydrogen 110 stored in the storage tank 100 is connected to the first pipe 101 and It is supplied to the mobility 20 through the first valve unit 300 (step S20).

Thus, the liquid hydrogen 110 is charged to the mobility 20, and gaseous hydrogen may be generated in the mobility 20 during this charging process.

Accordingly, referring to FIGS. 4 and 5B, the gaseous hydrogen generated due to cooling and charging in the mobility 20 is supplied to the reliquefaction unit 500 through the first valve unit 300 and the recovery pipe 303. ) (step S30).

In this case, as described above, gaseous hydrogen generated in the mobility 20 may be directly provided to the fuel cell 700 through the recovery pipe 303, and electrical energy may be additionally produced through this. there is.

Meanwhile, the gaseous hydrogen provided to the re-liquefaction unit 500 is re-liquefied in the re-liquefaction unit 500 to produce liquid hydrogen, and is supplied to the storage tank 100 through the re-liquefaction pipe 501 (step S40 ), the liquid hydrogen supplied in this way can be supplied back to the mobility 20.

Meanwhile, when the charging of liquid hydrogen and the recovery of gaseous hydrogen are completed, or during the process, a remaining amount of liquid hydrogen may be generated in the mobility 20. The remaining amount of liquid hydrogen in the mobility 20 may be It may be additionally recovered to the storage tank 100 through the second valve unit 400 and the second pipe 102.

For this purpose, it is obvious that the second valve unit 400 must be connected to the mobility 20 and the operation must be controlled to On.

Meanwhile, as shown in FIG. 5A, gaseous hydrogen 120 may be generated within the storage tank 100 due to natural vaporization, etc., and the gaseous hydrogen 120 generated in this way is discharged into the liquid through the third pipe 103. It is supplied to the fire unit 500 and reliquefied into liquid hydrogen. In this case, as described above, the gaseous hydrogen 120 can be supplied to the fuel cell 700 according to the operation of the switching valve 104.

In the case of the liquid hydrogen charging method as described above, the steps may be performed sequentially, but may be performed simultaneously or in a different order depending on various situations such as the charging state of the mobility 20.

According to the embodiments of the present invention as described above, liquid hydrogen can be simply charged through a plug-in type valve unit between the mobility and charging system, thereby improving usability.

In particular, through the first valve unit, gaseous hydrogen generated by cooling and charging of the mobility can be immediately recovered along with the charging of liquid hydrogen, so charging and recovery can be performed simultaneously to provide a stable supply of liquid hydrogen. In this case, since the charging and recovery pipes in the first valve unit are connected to each other in an insulated state, heat exchange between liquid hydrogen and gaseous hydrogen may be blocked.

Furthermore, through the second valve unit, the remaining amount of liquid hydrogen in the mobility can be recovered to the storage tank, thereby minimizing energy waste by minimizing the consumption of liquid hydrogen.

In addition, energy waste can be minimized by liquefying gaseous hydrogen through the re-liquefaction unit and supplying it back to the storage tank.

In this case, in addition to recovery to the re-liquefaction unit, the electricity required by the fuel cell can be directly produced by being recovered to the fuel cell, thereby further improving the efficiency of energy utilization.

Although the present invention has been described above with reference to preferred embodiments, those skilled in the art may make various modifications and changes to the present invention without departing from the spirit and scope of the present invention as set forth in the following patent claims. You will understand that it is possible.

10: Liquid hydrogen charging system 20: Mobility
100: storage tank 101, 102, 103: piping
200: pump unit 300: first valve unit
301: first charging pipe 302: first recovery pipe
303: Recovery pipe 400: Second valve unit
401: second recovery pipe 500: reliquefaction unit
600: Mobile storage unit 700: Fuel cell

Claims (12)

A storage tank where liquid hydrogen is stored;
A reliquefaction unit connected to the storage tank and reliquefying gaseous hydrogen into liquid hydrogen;
A pair of first and second pipes connected between mobility and the storage tank;
a recovery pipe connected between the mobility and the reliquefaction unit;
a first valve unit that simultaneously controls the first pipe and the recovery pipe;
a second valve unit controlling the second pipe;
A movable storage unit that is movable and provides liquid hydrogen to the storage tank; and
Comprising a fuel cell connected between the mobility and the re-liquefaction unit,
A switching valve is provided on the recovery pipe to select recovery to the reliquefaction unit or the fuel cell,
A liquid hydrogen charging system, wherein the fuel cell is a separate mobility device or is provided in an energy production device. According to paragraph 1,
Liquid hydrogen from the storage tank is supplied to the mobility through the first pipe,
Through the second pipe, the remaining amount of liquid hydrogen remaining in the mobility is recovered to the storage tank,
A liquid hydrogen charging system, characterized in that gaseous hydrogen generated in the mobility is recovered to the re-liquefaction unit through the recovery pipe. According to paragraph 2,
In the first valve unit, the first pipe and the return pipe extend a predetermined distance apart from each other,
The first valve unit is a liquid hydrogen charging system, characterized in that it includes a vacuum filled between the first pipe and the recovery pipe. According to paragraph 2,
In the first valve unit, the first pipe extends from the center, and the return pipe extends from the outside of the first pipe,
The first valve unit is a liquid hydrogen charging system comprising an insulating portion formed between the first pipe and the recovery pipe, and a vacuum section filled outside the recovery pipe. According to paragraph 2,
A liquid hydrogen charging system, wherein each of the first and second valve units is a check valve. The method of claim 1, wherein each of the first and second valve units,
A liquid hydrogen charging system, characterized in that it is a plug-in valve for attaching and detaching the liquid hydrogen charging system to the mobility. According to paragraph 1,
A third pipe connected between the storage tank and the reliquefaction unit; and
Liquid hydrogen charging system further comprising a reliquefaction pipe connected between the reliquefaction unit and the storage tank. In clause 7,
Gaseous hydrogen from the storage tank is supplied to the reliquefaction unit through the third pipe,
A liquid hydrogen charging system, wherein liquid hydrogen liquefied in the reliquefaction unit is supplied to the storage tank through the reliquefaction pipe. delete Recovering the remaining amount of liquid hydrogen in the mobility to a storage tank through a second valve unit and a second pipe;
Supplying liquid hydrogen stored in the storage tank to the mobility through a first pipe and a first valve unit;
Recovering gaseous hydrogen generated due to cooling and charging in the mobility to a reliquefaction unit through the first valve unit and recovery pipe; and
Comprising the step of re-liquefying the gaseous hydrogen recovered in the re-liquefaction unit and supplying it to the storage tank,
Liquid hydrogen is provided from a movable portable storage unit to the storage tank,
In the step of recovery to the reliquefaction unit, recovery to the reliquefaction unit or a fuel cell connected between the mobility and the reliquefaction unit is selected through a switching valve provided on the recovery pipe,
A liquid hydrogen charging method, wherein the fuel cell is a separate mobility device or is provided in an energy production device. According to clause 10,
Liquid hydrogen charging method further comprising supplying gaseous hydrogen from the storage tank to the re-liquefaction unit through a third pipe, and supplying liquid hydrogen re-liquefied in the re-liquefaction unit to the storage tank. According to clause 10,
The steps of supplying liquid hydrogen from the storage tank to the mobility and recovering the gaseous hydrogen of the mobility to the re-liquefaction unit are simultaneously controlled by the first valve unit,
A liquid hydrogen charging method, characterized in that the step of recovering the remaining amount of liquid hydrogen for the mobility is controlled by a second valve unit.

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