KR20190066303A - Appratus and Method for detecting leakage of liquid hydrogen storage tank - Google Patents

Abstract

An apparatus for detecting a leakage of a liquid hydrogen storage tank is disclosed. An embodiment of the present invention provides the apparatus for detecting the leakage of the liquid hydrogen storage tank, detecting the leakage of liquid hydrogen in an inner barrier space which is a space between a primary barrier and a secondary barrier in the liquid hydrogen tank, comprising: a first power source unit; a first signal generation unit receiving electricity from the first power source unit to generate a first leakage signal; and a first switch having a first switch inner space in which a first gas having a boiling point higher than hydrogen is accommodated, and applying electricity from the first power source unit to the first signal generation unit if the first gas is liquefied by a liquefied gas leaked into the inner barrier space, wherein the first switch includes: a first-1 conductor connected to one between a plus terminal and a minus terminal of the first power unit and providing one surface of the first switch inner space; a first non-conductor stacked on one surface of the first-1 conductor and having a first-1 hollow part which is a portion of the first switch inner space; a first-2 conductor connected to the other between the plus terminal and the minus terminal of the first power source unit, stacked on one surface of the first non-conductor, and having a first-2 hollow part which is a portion of the first switch inner space; and a first cover conductor stacked on the first-2 conductor to cover the first-2 hollow part, providing the other surface of the first switch inner space, and having a flexible membrane shape.

Description

Technical Field [0001] The present invention relates to a liquid hydrogen storage tank leak detection apparatus,

The present invention relates to a liquefied hydrogen storage tank leak detection device.

Liquefied natural gas storage tanks are used for storing or transporting extremely low temperature Liquefied Natural Gas (LNG) at about -163 ° C. It is equipped with two barriers (primary barrier and secondary barrier) to seal liquefied natural gas do.

The liquefied natural gas storage tank has a plywood structure in a heat insulating member made of a polyurethane foam material having a low thermal conductivity between a primary barrier and a secondary barrier, a secondary barrier and an inner hull, A heat insulating layer is formed by using a heat insulating board having a heat insulating member protecting plate having a high compressive strength.

The Inner Barrier Space, which is the space between the primary barrier and the secondary barrier of the conventional liquefied natural gas storage tank, is filled with nitrogen. When the pressure of nitrogen in the inner barrier space fell, it was judged that the primary barrier was damaged and follow-up measures were taken.

On the other hand, in recent years, the demand for hydrogen in the industry has been increased, and the technology for liquefying and transporting hydrogen has been developed. Hydrogen has a boiling point of about -252.7 ° C, much lower than natural gas. Therefore, if nitrogen is filled in the Inner Barrier Space, which is the space between the primary barrier and the secondary barrier of the liquefied hydrogen storage tank, the nitrogen is liquefied, making it difficult to detect whether the liquefied hydrogen storage tank is damaged or not.

To solve these problems, it is urgent to develop a device for detecting damage to a liquid hydrogen storage tank or a device for detecting a leaked liquid hydrogen.

An embodiment of the present invention is to provide an apparatus for detecting whether or not a liquefied gas has leaked into an inner barrier space of a liquefied hydrogen storage tank.

According to an aspect of the present invention, there is provided an apparatus for detecting leakage of liquefied hydrogen to an inner barrier space which is a space between a primary barrier and a secondary barrier of a liquefied hydrogen storage tank, the apparatus comprising: a first power supply unit; A first signal generator for receiving electricity from the first power source to generate a first leak signal; And a first switch internal space in which a first gas having a boiling point higher than that of hydrogen is received is formed, and when the first gas is liquefied by the liquefied gas leaking into the inner barrier space, A first switch connected to one of a plus terminal and a minus terminal of the first power supply unit and having a first terminal for providing a first surface of the first switch internal space, 1 conductor; A first non-conductive member laminated on one surface of the first conductor and having a first hollow portion that is a portion of the first switch internal space; A first 1-2 conductor connected to the remaining one of the plus terminal and the minus terminal of the first power supply unit and stacked on one surface of the first non-conductor and having a first 1-2 hollow portion as a part of the first switch internal space; And a first cover conductor in the form of a flexible membrane, said first cover conductor being laminated to said first conductor to cover said first 1-2 hollow portion and providing a second surface of said first switch internal space, A sensing device may be provided.

The liquefied hydrogen storage tank leakage sensing apparatus may further include: a second power supply unit; A second signal generator receiving electricity from the second power source to generate a second leak signal; And a second switch internal space in which a second gas having a boiling point higher than that of the hydrogen and having a boiling point lower than that of the first gas is received is formed in the inner barrier space, And a second switch for applying electricity from the second power source to the second signal generator when the second power source is liquefied, the second switch is connected to one of a plus terminal and a minus terminal of the second power source, A second-1 conductor for providing a face of the inner space; A second non-conductive portion formed on one surface of the second-1 conductor and having a second-1 hollow portion that is a portion of the space inside the second switch; A second 2-2 conductor connected to the remaining one of the plus terminal and the minus terminal of the second power source unit and stacked on one surface of the second nonconductor and having a second 2-2 hollow portion as a part of the second switch inner space; And a second cover conductor in the form of a flexible membrane, which is laminated on the second-2 conductor to cover the second-2 hollow portion and provides the other surface of the second switch internal space.

The first cover conductor and the second cover conductor may be made of graphene.

Wherein the first non-conductor has a ring shape formed with the first-first hollow portion at the center, the first-second conductor has a ring shape formed with the first-second hollow portion at the center thereof, The second-2 conductor may have a ring shape formed with the second-2 hollow portion, and the second-2 conductor may have a ring shape with the second-2 hollow portion formed at the center thereof.

The first power supply unit may include a first piezoelectric element, and the second power supply unit may include a second piezoelectric element.

The first power source unit may further include a first battery, and the second power source unit may further include a second battery.

The first switch and the second switch may be disposed inside or outside the inner barrier space.

According to an embodiment of the present invention, a first switch internal space, in which a first gas having a higher boiling point than hydrogen is contained, is formed in the interior of the first switch, and when leakage of liquefied hydrogen occurs in an inner barrier space, By using a switch that applies electricity, it is easy to detect whether the primary barrier of the storage tank storing the liquefied hydrogen, which is much cryogenic compared to the liquefied natural gas at about -252.7 ° C, is leaking into the inner barrier space And thus quick and effective action can be taken.

1 is a cross-sectional view of a liquefied hydrogen storage tank according to an embodiment of the present invention,
Fig. 2 is an enlarged view of a portion A in Fig. 1,
FIG. 3 is a view illustrating a leak detection apparatus according to an embodiment of the present invention,
4 is an exploded perspective view of a first switch according to an embodiment of the present invention,
5 is a perspective view of a first switch according to an embodiment of the present invention,
6 is a view illustrating an embodiment of a switch according to one embodiment of the present invention,
7 is a view showing another form according to the position of a switch according to an embodiment of the present invention,
8 and 9 are views for explaining the operation of the first switch according to the embodiment of the present invention,
FIG. 10 is a view showing a leakage sensing apparatus according to another embodiment of the present invention,
11 is an exploded perspective view of a second switch according to an embodiment of the present invention,
12 is a perspective view of a second switch according to an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The present invention is capable of various modifications and various embodiments, and specific embodiments are illustrated in the drawings and described in detail in the detailed description. It is to be understood, however, that the invention is not to be limited to the specific embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. Referring to the accompanying drawings, the same or corresponding components are denoted by the same reference numerals, do.

FIG. 1 is a cross-sectional view of a liquefied hydrogen storage tank according to an embodiment of the present invention, and FIG. 2 is an enlarged view of a portion A of FIG. 1 and 2, + X denotes the front of the liquefied hydrogen storage tank or the front of the hull where the liquefied hydrogen storage tank is formed, + Y denotes the left side of the liquefied hydrogen storage tank, .

Referring to FIGS. 1 and 2, a liquefied hydrogen storage tank 100 to which a leakage sensing apparatus (not shown) according to the present embodiment is applied stores liquefied hydrogen therein.

For example, the liquefied hydrogen storage tank 100 may be formed in the hull 10 of a ship or an offshore structure.

2, the liquefied hydrogen storage tank 100 includes a primary barrier 110, a secondary barrier 120, a primary insulation layer interposed between the primary barrier 110 and the secondary barrier 120 130 and a secondary insulation layer 140 interposed between the secondary barrier 120 and the inner wall 11 of the hull 10.

The primary barrier 110 is disposed in a configuration that is in direct contact with the liquefied hydrogen and is spaced away from the inner wall 101 constituting the hull 10 toward the liquefied hydrogen.

The primary barrier 110 may be composed of a plurality of membranes (not shown), and the membranes may be made of stainless steel or high manganese steel. These membranes can be bonded by welding at the interface.

Wrinkles 111 may be formed in the primary barrier 110. The wrinkles 111 may include transverse wrinkles formed transversely as shown in Fig. 2 and longitudinal wrinkles that are not shown but are orthogonal to the transverse wrinkles.

The secondary barrier 120 may be interposed between the primary barrier 110 and the inner wall 101 of the hull 10. The secondary barrier 120 may be composed of a plurality of membranes, and the membranes may be made of any one of stainless steel, aluminum, brass, zinc, and high manganese.

The primary insulating layer 130 is interposed in the inner barrier space IBS between the primary barrier 110 and the secondary barrier 120.

The primary heat insulating layer 130 may include a plurality of primary unit heat insulating blocks 131 and a primary heat insulating filler 133.

The plurality of primary unit heat insulating blocks 131 may be disposed adjacent to each other. The primary unit heat insulating block 131 may be formed of any one of a polyurethane foam, a micro-celluloid foam, a nano-celluloid foam, and a sandwich foam.

The primary heat insulating block 131 may be filled with the primary heat insulating filler 133. The primary adiabatic filler 133 may be composed of various materials capable of enhancing the heat insulating performance of the primary unit adiabatic blocks 131 such as a flexible adiabatic foam, a glass wool, and a putty.

An impact absorbing layer 135 may be interposed between the primary barrier 110 and the primary insulating layer 130. The impact absorbing layer 135 may be composed of various materials having a stiffness lower than that of the primary barrier 110, for example, a fiber-reinforced composite sheet or mat, a polymer resin, rubber, or the like.

The impact absorbing layer 135 may be bonded to the back surface of the primary barrier 110 by an adhesive such as an epoxy resin or by hot pressing.

A flywheel (not shown) may be provided between the impact absorbing layer 135 and the primary heat insulating layer 130 to reinforce the rigidity.

The secondary insulation layer 140 may be interposed between the secondary barrier 120 and the inner wall 101 of the hull 10.

The secondary insulation layer 140 may include a plurality of secondary insulation blocks 141 and a secondary insulation 143. The plurality of secondary unit heat insulating blocks 141 may be disposed adjacent to each other. The secondary unit heat insulating block 141 may be composed of polyurethane foam, sandwich foam, microcelluloid foam, nanocelluloid foam, and the like.

And between the adjacent secondary unit insulation blocks 141, the secondary insulation 143 may be filled. The secondary adiabatic filling material 143 may be composed of various materials capable of improving the heat insulating performance of the secondary unit insulating blocks 141 such as a flexible insulating foam, a glass wool, and a putty.

The primary unit heat insulating block 131 and the secondary unit heat insulating block 141 may be arranged to be offset from each other to prevent leakage of stored liquefied hydrogen.

The secondary insulation layer 140 may be fixed to the inner wall 101 of the hull 10 by means of a mastic 150 or a resin rope. When the plywood (not shown) is provided on the back surface of the secondary insulation layer 140 to reinforce the rigidity, the mastic 150 may be made of an epoxy resin, and the plywood may be formed on the inner wall 101 of the hull 10 ).

In this embodiment, the inner barrier space IBS, which is a space between the primary barrier 110 and the secondary barrier 120, is maintained in a vacuum state. Vacuum, for example, means a space in which no material exists at all, but it is actually a low pressure of 1/1000 mmHg or less because it is difficult to make such a thing (Source: Doosan Encyclopedia). However, the maximum pressure of 1/1000 mmHg which is the reference of vacuum is merely an example.

For example, if the liquefied hydrogen storage tank in which the inner barrier space (IBS) maintains a vacuum state is damaged in use and the primary barrier 110 is damaged, not only the vacuum state of the inner barrier space IBS is broken, It may leak into the inner barrier space (IBS) and cause a serious serious problem.

The leakage sensing device (not shown) according to the present embodiment can detect whether or not the stored liquefied hydrogen has leaked into the inner barrier space ibs.

FIG. 3 is an exploded perspective view of a first switch according to an embodiment of the present invention, and FIG. 5 is a perspective view of a first switch according to an embodiment of the present invention. 1 switch.

3 to 6, the leakage sensing device according to the present embodiment senses leakage of liquefied hydrogen to the inner barrier space.

According to the present embodiment, the leakage sensing device 200 may include a first power source unit 210, a first signal generator 230, and a first switch 250.

The first power supply unit 210 supplies electricity to the first signal generator 230, which will be described later.

The first power supply unit 210 may include a first piezoelectric element. The first piezoelectric element converts mechanical energy into electrical energy. For example, when the hull where the liquefied hydrogen storage tank is formed is in operation, the first piezoelectric element may also fluctuate due to fluctuation of the hull. During the operation of various equipment mounted on the hull, the hull is vibrated, so that the first piezoelectric element can also vibrate together. In this way, the first piezoelectric element produces electricity when the first piezoelectric element vibrates or vibrates.

When the first piezoelectric element is used as described above, electricity can be produced semi-permanently.

The first power source unit 210 may further include a first battery. Electricity generated in the first piezoelectric element can be stored in the first battery.

The first signal generator 230 receives electricity from the first power supply 210 and generates a first leak signal.

For example, the first signal generator 230 may include a radio transmitter. In this case, the first leak signal may be generated in the form of a wave and be received at an external wave receiver.

As another example, the first signal generator 230 may include a speaker. In this case, the first leak signal may be generated in the form of a sound wave and transmitted to the outside.

It is needless to say that various first signal generators 230 may be proposed.

The first switch 250 applies electricity from the first power supply unit 210 to the first signal generator 230 when the primary barrier is damaged and the stored liquid hydrogen leaks into the inner barrier space.

The first switch 250 is formed therein with a first switch internal space 250a for accommodating the first gas therein. The first gas has a higher boiling point than hydrogen. For example, the first gas may be oxygen or nitrogen.

The first switch 250 keeps the first gas in a gaseous state when the liquefied hydrogen does not leak into the inner barrier space, thereby blocking the application of electricity from the first power supply unit 210 to the first signal generator 230 .

When the leaked liquefied hydrogen is leaked into the inner barrier space, the first switch 250 liquefies the first gas by the cool air of the leaked hydrogen and the pressure of the space inside the first switch is lowered to deform the first switch 250, To the first signal generating unit 230. The first signal generating unit 230 generates the first signal.

The above-described switch operation mechanism will be described later.

In this embodiment, the first switch 250 may be disposed inside the inner barrier space. In this case, the cool air of the leaked liquefied hydrogen leaked into the inner barrier space can be directly transmitted to the first switch 250.

In another embodiment, the first switch 250 may be disposed outside the inner barrier space. At this time, it is preferable that the first switch 250 is disposed in contact with the outer surface of the secondary barrier. In this case, the cool air of the leaked liquefied hydrogen leaking into the inner barrier space is easily transferred to the first positional value 250 through the secondary barrier.

In the present embodiment, the first power source unit 210, the first signal generator 230, and the first switch 250 constituting the leakage sensing device 200 may all be disposed in the inner barrier space. In this case, the leakage sensing device 200 may be disposed inside the heat insulating material constituting the primary insulating layer 130 (FIG. 2) disposed in the inner barrier space, or may be disposed in the outer insulating material forming the primary insulating layer 130 Region. ≪ / RTI >

In another embodiment, at least one of the first power source unit 210, the first signal generator 230, and the first switch 250 constituting the leakage sensing device 200 may be disposed outside the inner barrier space. In this case, a through hole (not shown) may be formed in a part of the secondary barrier (not shown) for electrical connection between the structure disposed outside the inner barrier space and the structure disposed inside the inner barrier space, Can be sealed.

In this embodiment, the first switch 250 includes a first conductor 251, a first non-conductor 253, a first conductor 255, and a first cover conductor 257 .

The first conductor 251 is connected to one of the plus terminal and the minus terminal of the first power source unit 210. The first conductor 251 may have a plate shape. The first conductor 251 may provide a bottom surface of the first switch internal space 250a, for example.

The first insulated conductor 253 is laminated on one surface of the first conductor 251. The first insulated conductor 253 is formed with a first 1-1 hollow portion 253a which is a part of the first switch internal space 250a. The first non-conductor 253 has a ring shape. The first insulated conductor 253 may have a plate shape.

The first and second conductors 255 and 255 are connected to the positive and negative terminals of the first power source unit 210 that are not connected to the first conductor 251. The 1-2 conductor 255 is formed with a first 1-2 hollow portion 255a. The first non-conductor 253 has a ring shape. The 1-2 conductor 255 may have a plate shape.

The first cover conductor 257 is laminated on the first conductor 255 to cover the first-second hollow portion 255a. The first cover conductor 257 provides a ceiling view of the first switch internal space 250a, for example.

The first cover conductor 257 has a flexible membrane shape.

For example, the first cover conductor 257 may be made of graphene. Graphene has excellent stretchability and electrical conductivity.

In this embodiment, the first switch 250 may be disposed inside the inner barrier space. In this case, since the inner barrier space is maintained in the vacuum state, the first cover conductor 257 can be deformed into a convex shape outwardly as shown in Fig. 6 by the internal pressure of the first switch internal space filled with the first fluid . 6 is a view illustrating an embodiment of a switch according to one embodiment of the present invention.

In another embodiment, the first switch 25 may be disposed outside the inner barrier space. In this case, even if the inner barrier space maintains the vacuum state, the first cover conductor 257 can maintain a flat state as shown in FIG. 7 is a view illustrating another embodiment of a switch according to an exemplary embodiment of the present invention. Referring to FIG.

8 and 9 are views for explaining the operation of the first switch according to an embodiment of the present invention.

Hereinafter, the operation of the first switch 250 will be described with reference to FIGS. 6, 8, and 9. FIG.

6, when there is no damage to the primary barrier and the secondary barrier and the vacuum state of the inner barrier space is maintained, the first switch 250 switches the electricity of the first power source unit 210 to the first signal generator 230).

8, when the primary barrier (not shown) is damaged and the vacuum state of the inner barrier space (not shown) is broken and the liquefied hydrogen leaks into the inner barrier space, the cool air of the leaked liquefied hydrogen flows to the first switch The first gas in the internal space 250a is liquefied and the pressure in the first switch internal space 250a is rapidly lowered. For example, the first switch internal space 250a may be in a vacuum state. At this time, a force P toward the first switch internal space 250a acts on the first cover conductor 257 from the outside. This force P pushes the first cover conductor 257 into the first switch internal space 250a.

9, the first cover conductor 257 enters the first switch internal space 250a and is deformed to be in contact with the first conductor 251.

In this case, the first switch 250 applies the electricity of the first power source unit 210 to the first signal generator 230. When electricity is applied to the first signal generator 230, the first signal generator 230 generates a first leak signal and the first leak signal is recognized from the outside.

This leakage sensing device 200 can easily detect the damage of the primary barrier, more specifically the storage tank, which stores liquefied hydrogen, which is much cryogenic compared to liquefied natural gas at about -252.7 DEG C, Can be performed.

FIG. 10 is a view showing a leakage sensing apparatus according to another embodiment of the present invention, FIG. 11 is an exploded perspective view of a second switch according to an embodiment of the present invention, FIG. 12 is a cross- 2 switch.

10 to 12, the leakage sensing device 200 'according to the present embodiment includes a first power source unit 210, a first signal generator unit 230, a first switch 250, a second power source unit 310 A second signal generator 330, and a second switch 350.

The leakage sensing device 200 'according to the present embodiment is different from the leakage sensing device 200 according to the previous embodiment in that the second power source 310, the second signal generator 330, .

The second power supply unit 310 supplies electricity to the second signal generation unit 330, which will be described later.

The second power supply unit 310 may include a second piezoelectric element. The second power source unit 310 may further include a second battery.

The second signal generator 330 receives electricity from the second power source 310 and generates a second leak signal.

For example, the second signal generator 330 may include a radio transmitter. In this case, the second leak signal may be generated in the form of a wave and be received at an external wave receiver.

As another example, the second signal generator 330 may include a speaker. In this case, the second leak signal may be generated in the form of a sound wave and transmitted to the outside.

It is needless to say that various second signal generators 330 may be proposed.

The second switch 350 applies electricity from the second power supply unit 310 to the second signal generation unit 330 when the primary barrier is damaged and the stored liquid hydrogen leaks into the inner barrier space.

The second switch 350 is formed therein with a second switch internal space 350a for accommodating the second gas therein. The second gas has a higher boiling point than hydrogen and has a lower boiling point than the first gas. For example, when the first gas is oxygen, the second gas may be nitrogen.

The second switch 350 keeps the second gas in a gaseous state when the liquefied hydrogen does not leak into the inner barrier space, thereby blocking the electricity from being applied from the second power supply unit 310 to the first signal generation unit 330 .

When the leaked liquid hydrogen is leaked into the inner barrier space, the second switch 250 liquefies the second gas by the cool air of the leaked hydrogen and the pressure of the space inside the second switch is lowered, To the second signal generator 330.

In this embodiment, the second switch 350 includes a second-1 conductor 351, a second non-conductor 353, a second-2 conductor 355, and a second cover conductor 357 .

The 2-1 conductor 351 is connected to one of the plus terminal and the minus terminal of the second power source unit 310. [ The second-type conductor 351 may have a plate shape. The 2-1 conductor 351 may provide a bottom surface of the second switch internal space 350a, for example.

The second insulator 353 is laminated on one surface of the second-1 conductor 351. The second nonconductor 353 is formed with a second-1 hollow portion 353a which is a part of the second switch internal space 350a. The second non-conductor 353 has a ring shape. The second insulator 353 may have a plate shape.

The second-second conductor 355 is connected to the remaining one of the positive terminal and the negative terminal of the second power source unit 310 that is not connected to the second-first conductor 351. The second -2 conductor 355 is formed with the second -2 hollow portion 355a. The second non-conductor 353 has a ring shape. The 2-2 conductor 355 may have a plate shape.

The second cover conductor 357 is laminated to the second-2 conductor 355 so as to cover the second-second hollow portion 355a. The second cover conductor 357 provides a ceiling view of the second switch internal space 350a, for example.

The second cover conductor 357 has a flexible membrane shape.

For example, the second cover conductor 357 may be made of graphene. Graphene has excellent stretchability and electrical conductivity.

The operating mechanism of the second switch 350 as described above is the same as the operating mechanism of the first switch 250.

In this embodiment, the leak sensing device 200 'includes a first switch 250 and a second switch 350. The first switch 250 and the second switch 350 may be disposed adjacent to each other. For example, the first switch 250 and the second switch 350 may be disposed adjacent to each other. Or the first switch 250 and the second switch 350 may be arranged to be spaced apart from 0 cm to 100 cm or less.

The second gas of the second switch 350 has a higher boiling point than the first gas of the first switch 250. In this case, the operation of the first switch 250 and the second switch 350 may vary depending on the distance between the first switch 250 and the second switch 350 and the leakage point.

For example, if the first switch 250 and the second switch 350 are close to the leak point, the first gas of the first switch 250 and the second gas of the second switch 350 are separated by the leaking liquefied gas Both are liquefied, and both the first switch 250 and the second switch 350 operate to apply electricity. The case where the first switch 250 and the second switch 350 are operated to apply electricity is referred to as a first mode for the sake of convenience.

Or the first switch 250 and the second switch 350 are somewhat distant from the leaking point, the first gas of the first switch 250, which is relatively high in boiling point due to the leaked liquefied gas, And the second gas of the second switch 350 having a relatively low boiling point maintains a gas state and operates so as not to apply electricity. In this way, the first switch 250 is operated to apply electricity and the second switch 350 is operated to not apply electricity for the sake of convenience.

Or the first switch 250 and the second switch 350 are very far from the leakage point, the leaked liquefied gas does not affect the first switch 250 and the second switch 350, The second switch 350 operates so as not to apply electricity. When the first switch 250 and the second switch 350 are operated so as not to apply electricity, it is referred to as a third mode for the sake of convenience.

The leak detection device 200 'operating as described above may be provided in a plurality of ways. The plurality of leak detecting devices 200 'may be disposed apart from each other. At this time, the leak detection devices near the leak point operate in the first mode, and the leak point and the far-away leak detectors operate in the second mode, and the leak detectors far from the leak point operate in the third mode.

By analyzing the mode of the leak detection devices, the position of the leak point can be grasped roughly. For example, the leak detection devices operating in the first mode may determine a plurality of distributed areas as leaking points.

This leak detection device 200 'is a storage tank for storing liquefied hydrogen, which is much cryogenic compared to liquefied natural gas at about -252.7 ° C, which can more easily detect damages of the primary barrier, .

In the leakage sensing device 200 'according to the present embodiment, the first power supply unit 210 and the second power supply unit 310 are connected to the first signal generation unit 230 and the second signal generation unit 330, respectively. Supply. However, in another embodiment, the same power supply unit can supply electricity to the first signal generator 230 and the second signal generator 330.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, many modifications and changes may be made by those skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims. The present invention can be variously modified and changed by those skilled in the art, and it is also within the scope of the present invention.

10: Hull
100: Liquefied gas storage tank
110: Primary barrier
111: Crease
120: Secondary barrier
130: Primary insulation layer
131: primary unit insulation block
133: Primary insulation packing
135: shock absorbing layer
140: Secondary insulation layer
141: Secondary unit insulation block
143: Secondary insulation packing
200, 200 ': leak detection device
210: a first power source
230: first signal generator
250: Switch
250a: space inside the switch
251: 1-1 conductor
253: First insulated conductor
255: 1st-2nd conductor
257: first cover conductor
310: second power source
330: second signal generator
350: Switch
350a: space inside switch
351: No. 2-1 conductor
353: Secondary insulator
355: 2-2 conductor
357: second cover conductor

Claims (7)

An apparatus for detecting leakage of liquefied hydrogen to an inner barrier space, which is a space between a primary barrier and a secondary barrier of a liquefied hydrogen storage tank,
A first power supply unit;
A first signal generator for receiving electricity from the first power source to generate a first leak signal; And
Wherein a first switch internal space is formed in which a first gas having a boiling point higher than that of hydrogen is received, and when the first gas is liquefied by the liquefied gas leaking into the inner barrier space, And a first switch for applying electricity to the generator,
Wherein the first switch comprises:
A first 1-1 conductor connected to one of a plus terminal and a minus terminal of the first power supply unit and providing a face of the first switch internal space;
A first non-conductive member laminated on one surface of the first conductor and having a first hollow portion that is a portion of the first switch internal space;
A first 1-2 conductor connected to the remaining one of the plus terminal and the minus terminal of the first power supply unit and stacked on one surface of the first non-conductor and having a first 1-2 hollow portion as a part of the first switch internal space; And
A first cover conductor in the form of a flexible membrane, said first cover conductor being laminated to said first conductor to cover said first 1-2 hollow portion and providing an opposite surface of said first switch internal space, Device. The method according to claim 1,
A second power supply unit;
A second signal generator receiving electricity from the second power source to generate a second leak signal; And
Wherein a second switch internal space is formed in which a second gas having a boiling point higher than that of the hydrogen and having a boiling point lower than that of the first gas is accommodated and the second gas is liquefied by the liquefied gas leaking into the inner barrier space And a second switch for applying electricity from the second power source to the second signal generator,
Wherein the second switch comprises:
A second-1 conductor connected to one of a plus terminal and a minus terminal of the second power supply unit and providing a face of the second switch internal space;
A second non-conductive portion formed on one surface of the second-1 conductor and having a second-1 hollow portion that is a portion of the space inside the second switch;
A second 2-2 conductor connected to the remaining one of the plus terminal and the minus terminal of the second power source unit and stacked on one surface of the second nonconductor and having a second 2-2 hollow portion as a part of the second switch inner space; And
And a second cover conductor in the form of a flexible membrane, the second cover conductor being laminated to the second-2 conductor to cover the second-2 hollow portion and providing the other surface of the second switch internal space, Sensing device. 3. The method of claim 2,
The first cover conductor and the second cover conductor are electrically connected to each other,
Liquid hydrogen storage tank leak detector made of graphene. 3. The method of claim 2,
The first non-conductor has a ring shape formed with the first 1-1 hollow portion in the center,
The 1-2 conductor has a ring shape formed with the first 1-2 hollow portion in the center,
The second non-conductor has a ring shape formed with the second-1 hollow portion at the center thereof,
And the second-2 conductor has a ring-like shape with the second-second hollow portion formed at the center thereof. 3. The method of claim 2,
Wherein the first power supply section includes a first piezoelectric element,
And the second power supply comprises a second piezoelectric element. 6. The method of claim 5,
The first power supply unit may further include a first battery,
And the second power supply further comprises a second battery. 3. The method of claim 2,
Wherein the first switch and the second switch comprise:
Wherein the inner barrier space is disposed inside or outside the inner barrier space.

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