KR20110121202A - Liqufied gas vessel having an electric system - Google Patents

Abstract

PURPOSE: A liquefied gas carrier including an electric system is provided to improve the operation efficiency of a carrier by generating and storing power using a superconductor. CONSTITUTION: A liquefied gas carrier includes a liquefied gas storage tank and an electric system(500). An electric system is arranged in the liquefied gas storage tank and uses a superconductor(540) which is cooled by the liquefied gas stored in the liquefied gas storage tank. The electric system includes a generating system.

Description

Liquefied gas carrier with electric system {LIQUFIED GAS VESSEL HAVING AN ELECTRIC SYSTEM}

The present invention relates to a liquefied gas carrier, and more particularly to a liquefied gas carrier having an electric system.

Electrical loads embedded in a ship or offshore structure generally operate by receiving electrical energy from an embedded electrical system. The production of electricity in the electrical system is carried out in various ways. For example, the power generation system can be operated using an auxiliary power device, using a propulsion system, collecting waste heat for reuse, or boiled off gas (BOG) in the case of gas carriers. That is, various methods for supplying electrical energy to electrical loads of a ship or offshore structure have been sought. In addition, a method of treating surplus electric energy when the produced electric energy is not exhausted has also been studied.

Embodiments of the present invention can provide a vessel having an electrical system using a superconductor.

Provide a liquefied gas transport vessel. The liquefied gas transport vessel includes a liquefied gas storage tank and an electrical system disposed inside the liquefied gas storage tank. The electrical system can be operated using superconductors. The superconductor may be cooled using liquefied gas stored in a liquefied gas storage tank.

In one embodiment of the invention, the electrical system may comprise a power generation system. The power generation system may include a magnetic body that is spaced to face the superconductor, a driving coil and a power generation coil that are spaced apart from the magnetic body and disposed around the magnetic body. The magnetic body floats and rotates by the superconductor, thereby generating electricity in the coil for power generation. The liquefied gas transport vessel may further include a generator for generating power using gaseous gas generated from the liquefied gas storage tank, and the electrical system may be electrically connected with the generator.

In one embodiment of the invention, the electrical system may comprise a charging system. The charging system may comprise a superconducting coil. The liquefied gas transport vessel further includes a generator for generating power using gaseous gas generated from the liquefied gas storage tank, wherein the electrical system can be electrically connected with the generator.

In one embodiment of the present invention, further comprising a protrusion formed on the inner surface of the liquefied gas storage tank, the superconductor may be disposed inside the protrusion. An edge portion of the liquefied gas storage tank may include a chamfer formed to be inclined, and the protrusion may be formed in the chamfer.

In one embodiment of the present invention, the superconductor comprises a superconducting coil, the electrical system is spaced apart from the distal end of the superconducting coil and connected to the conducting wire and the conducting wire surrounding the inner space through which the magnetic force lines pass and the inner space It may include a rotating member for rotating the wire to change the line of magnetic force passing through. The rotating member may include a superconducting magnetic bearing.

According to one embodiment of the present invention, the use of superconductors enables efficient power generation and / or power conservation. Therefore, efficient operation is possible in the operation of the ship.

1 is a side view of a liquefied gas transport ship according to an embodiment of the present invention.
2 is a side view of a liquefied gas transport ship according to another embodiment of the present invention.
3 is a cross-sectional view of a liquefied gas storage tank according to an embodiment of the present invention.
4 is a cross-sectional view of a liquefied gas storage tank according to another embodiment of the present invention.
5 is a cross-sectional view of an electrical system according to an embodiment of the present invention.
6 is a cross-sectional view of an electrical system according to another embodiment of the present invention.
7 is an enlarged view of a portion A of FIG. 3.
8 is a cross-sectional view of an electrical system according to an embodiment of the present invention.

Hereinafter, specific embodiments of the present invention will be described with reference to the accompanying drawings. In the following description, when a part is said to "include" a certain component, it means that it may further include other components, except to exclude other components unless specifically stated otherwise. In addition, the terms “… unit”, “… unit”, “module”, “block”, and the like described in the specification are units for processing at least one function or operation, and may be a unit implemented by hardware, software, or a combination thereof. it means. Orientation of an apparatus or element, such as "before", "after", "left", "right", "up", "bottom", etc., is intended to simplify the description of the present invention and the associated apparatus or element may be It does not indicate or mean that it must have a specific direction.

1 is a side view of a liquefied gas transport ship according to an embodiment of the present invention. 2 is a side view of a liquefied gas transport ship according to another embodiment of the present invention.

Referring to FIG. 1, a liquefied gas transport vessel 100 may include liquefied gas storage tanks 110, an electrical system 120, and an electrical system controller 130.

The liquefied gas transportation vessel 100 is a vessel that liquefies gas and stores the liquefied gas in the liquefied gas storage tank 110 and transports it, for example, an LNG gas carrier, an LPG gas carrier, and a floating production storage offloading facility. FPSO) may include vessels and offshore structures, including liquefied gas storage tanks, such as floating storage and regasification units (FSRUs) and LNG regasification vessels (RVs).

The liquefied gas storage tank 110 may liquefy and store a gas that is a gas. For example, natural gas may be cooled to cryogenic temperatures (eg, about −163 ° C.) to reduce volume and store. The liquefied gas storage tank 110 may include an independent tank type and a membrane type. The independent tank type may include a MOSS type, an IHI-SPB, a conch, a pressure type, and the like. The membrane type may include GTT NP.96, GTT Mark III, KC01 / SC-1, and the like.

Electrical system 120 may include a power generation system and / or a charging system. Electrical system 120 may also include a superconductor. For example, the superconductor may include a material in which the electrical resistance decreases as the temperature decreases and the magnetic repulsion effect increases. For example, the superconductor may include a low temperature superconductor and a high temperature superconductor, and may include a metal superconductor, an oxide superconductor, and an organic superconductor according to material properties. The power generation system and the charging system will be described later.

The electrical system 120 may be disposed inside the liquefied gas storage tank 110. In FIG. 1, the electrical system 120 is disposed at a lower edge portion of the liquefied gas storage tank 110, but is not limited thereto, and may be disposed at any portion of the liquefied gas storage tank 110. Here, since the electrical system 120 is disposed inside the liquefied gas storage tank 110, the internal temperature of the liquefied gas storage tank 110 and the internal temperature of the electrical system 120 may be substantially the same. The electrical system 120 may be electrically connected to the electrical system controller 130. For example, the plurality of electrical systems 120 may be electrically connected to one electrical system controller 130. Here, the electrical connection may be a parallel connection or a series connection. The electrical system controller 130 may control power supply to the electrical system 120 or convert electricity generated from the electrical system 120. In addition, the electrical system controller 130 may control on / off of each electrical system 120.

Referring to FIG. 2, the liquefied gas transport vessel 200 includes liquefied gas storage tanks 210a, 210b, 210c, and 210d, electrical systems 220a, 220b, 220c, and 220d, and electrical system controllers 230a, 230b, 230c, 230d). Liquefied gas storage tanks 210a, 210b, 210c, 210d, electrical systems 220a, 220b, 220c, 220d and electrical system controllers 230a, 230b, 230c, 230d are shown in FIG. 1. Since the liquefied gas storage tanks 110 and the electrical system 120 and the electrical system controller 130 of the 100 is substantially similar or identical, detailed descriptions may be omitted and only differences may be described.

One electrical system is electrically connected to one electrical system controller. Thus, according to another embodiment of the present invention, it is easy to control one electric system each, and each tank may have a power generation system or a charging system.

1 and 2 show one tank with one electrical system, one tank may have a plurality of electrical systems. In this case, the electrical system controller may also be connected to each electrical system, respectively. Alternatively, a plurality of electrical systems may be controlled by one electrical system controller.

3 is a cross-sectional view of a liquefied gas storage tank according to an embodiment of the present invention.

According to FIG. 3, liquefied gas storage tank 300 may include an electrical system 330. The liquefied gas storage tank 300 may further include a chamfer 305 at upper and lower edges. The chamfer 305 may have an angle, for example, about 45 degrees, with the bottom or top surface of the liquefied gas storage tank 300. The height of the chamfer 305 can be appropriately adjusted at the time of design.

7 is an enlarged view of a portion A of FIG. 3. Referring to FIG. 7, the liquefied gas storage tank 300 is formed under the first barrier 710, the first insulation layer 720 formed under the primary barrier 710, and under the first insulation layer 710. It may include a second barrier 730 and a second insulating layer 740 formed under the secondary barrier 730. The electrical system 330 according to an embodiment of the present invention may be disposed between the primary barrier 710 and the first insulating layer 720. Accordingly, the temperature inside the liquefied gas storage tank 300 can be easily transmitted to the electrical system 330. The structure of the liquefied gas storage tank 300 illustrated in FIG. 7 may be modified according to the type of the liquefied gas storage tank 300, and the technical spirit of the present invention described later is based on the modification of the type of the storage tank 300. It can be applied in various ways.

In one embodiment of the present invention, the liquefied gas storage tank 300 may include a protrusion 315. The protrusion 315 may be formed to extend along the length direction or the width direction of the liquefied gas storage tank 300, but is not limited thereto. The protrusion 315 may reduce the sloshing load of the liquefied gas accommodated in the liquefied gas storage tank 300. The protrusion 315 may include the same material as the inner wall of the liquefied gas storage tank 300. The protrusion 315 may be formed to have a predetermined angle with the inner wall of the liquefied gas storage tank 300. In one embodiment of the invention, the electrical system 330 may be disposed below the protrusion 315. A first insulator 320 may be further disposed between the protrusion 315 and the electrical system 330. A second insulator 325 may be further disposed to receive the electrical system 330.

The electrical system 330 may be disposed inside the liquefied gas storage tank 300 and cooled to a temperature substantially the same as the internal temperature of the liquefied gas storage tank 300. The cooling may be performed by liquefied gas.

Electrical system 330 according to an embodiment of the present invention may include a superconductor. The electrical system 330 may further include a temperature transmitting member capable of transmitting the internal temperature of the liquefied gas storage tank 300 to the electrical system 330. The electrical system 330 may be disposed in the chamfer 305 and a plurality may be disposed inside the liquefied gas storage tank.

4 is a cross-sectional view of a liquefied gas storage tank according to another embodiment of the present invention.

Referring to FIG. 4, except for the placement of the electrical system 430, the first insulator 420 and the second insulator 425 are substantially similar to the first insulator 320 and the second insulator 325 of FIG. 3. The same description will be omitted. Electrical system 430 may be formed on top of liquefied gas storage tank 400. The electrical system 430 may not protrude into the liquefied gas storage tank 400 because the electrical system 430 protrudes outward from the upper portion of the liquefied gas storage tank 400.

5 is a cross-sectional view of an electrical system according to an embodiment of the present invention.

Referring to FIG. 5, the electrical system may include a power generation system 500. For example, the power generation system 500 may be disposed between the inner wall 510 and the protrusion 520 of the liquefied gas storage tank. However, the position of the power generation system 500 is not limited thereto. Inner wall 510 may include embossing structure 515. Depending on the environment to which the present invention is applied, a plurality of power generation systems 500 may be formed in a liquefied gas storage tank. In addition, the plurality of power generation systems 500 may be connected to each other in parallel or in series.

The power generation system 500 includes a superconductor 540, a superconductor support 530, a first magnetic body 555, a rotating body 560, a second magnetic body 565, a driving coil 570, and a power generation coil ( 580 and wires 545.

According to an embodiment of the present invention, the superconductor support 530 may be attached to the inner wall 510 to support the superconductor 540. However, the present invention is not limited thereto, and the superconductor 540 and the inner wall 510 may be directly connected without the superconductor support 530 according to the applied environment. The superconductor support 530 may transmit the temperature of the liquefied gas storage tank to the superconductor 540. Accordingly, the temperature of the superconductor 540 may be cooled to a temperature substantially the same as the internal temperature of the liquefied gas storage tank.

According to an embodiment of the present invention, the superconductor 540 has superconductor characteristics due to the cryogenic temperature of the liquefied gas storage tank. For example, the superconductor 540 has an electrical resistance close to zero and may have a magnetic repulsion effect. Superconductor 540 is La-Ba-Cu-O-based, Y-Ba-Cu-O-based, Bi-Sr-Ca-Cu-O-based, Ti-Ba-Ca-Cu-O-based, Hg-Ba-Ca -Cu-O system and the like. However, the material included in the superconductor 540 is not limited thereto. The superconductor 540 may be in the shape of a disc or alternatively, may be in the shape of a square plate.

The rotating body 560 may have a cylindrical shape. The first magnetic body 555 may be disposed below the rotating body 560, and the second magnetic body 565 may be disposed above the rotating body 560. The first magnetic body 555 receives the floating force by the superconductor 540. Accordingly, the first magnetic body 555 may float the rotating body 555 and the second magnetic body 565. The first magnetic body 555 may be in the shape of a disk or alternatively, may be in the shape of a square plate. The diameter of the first magnetic body 555 may be equal to, smaller than, or larger than the diameter of the superconductor 540. In one embodiment, the center of the first magnetic body 555 may coincide with the center of the superconductor 540. Reference numeral 590 shows that the center of the first magnetic body 555 and the center of the superconductor 540 coincide. In another embodiment of the present invention, the second magnetic body 565 may be a plurality of magnetic bodies in which poles (N pole, S pole) are alternately arranged.

The driving coil 570 and the power generating coil 580 may be disposed to be spaced apart from the first magnetic body 555, the rotating body 560, and the second magnetic body 565. In one embodiment of the present invention, the driving coil 570 and the power generating coil 580 may be arranged to surround the side of the second magnetic body 565. Alternatively, the driving coil 570 and the power generating coil 580 may be disposed above the second magnetic body 565. The first magnetic body 555, the second magnetic body 565, and the rotating body 560 may be rotated by the driving coil 570. That is, the first magnetic force body 555, the second magnetic force body 565, and the rotating body 560 may be integrally rotated. Since the center line 590 coincides, it is possible for the first magnetic body 555, the second magnetic body 565, and the rotating body 560 to stably rotate. The first magnetic body 555, the second magnetic body 565 and the rotating body 560 are floated by the superconductor 540 and can rotate without friction, so that efficient power generation without loss due to friction is possible. Electromotive force is generated in the power generation coil 580 by the rotation and may be transmitted to the electric system control unit (not shown) through the wire 545 or directly to the electric loads.

6 is a cross-sectional view of an electrical system according to another embodiment of the present invention.

The electrical system can include a charging system 600. The filling system 600 may be disposed between the inner wall 610 of the liquefied gas storage tank and the first insulating layer 605. However, the location of the charging system is not limited thereto. Inner wall 610 may include embossing structure 615. The filling system 600 may be arranged in plural in one liquefied gas storage tank. The plurality of charging systems 600 may be connected in series or in parallel with each other.

The inner wall 610 may be formed at an angle with the bottom surface of the liquefied gas storage tank. The first insulator 625 may include an insulating material as a structural reinforcing material. The partition wall 612 may support the inner wall 610. The second insulator 635 may form an inner space 627. The first insulator 625 and the second insulator 635 may prevent the temperature of the liquefied gas storage tank from radiating to the outside and maintain the temperature of the superconductor 630.

The charging system 600 may include a superconductor 630, a wire 645, and a temperature transfer member 640. Some of the temperature transfer member 640 may be exposed inside the liquefied gas storage tank and some may be exposed to the interior space 627. Accordingly, the temperature transmitting member 640 may allow the temperature inside the liquefied gas storage tank to be transferred to the superconductor 630. Wrinkles may be formed on the surface of the temperature transmitting member 640 exposed inside the liquefied gas storage tank. Accordingly, the surface area of the temperature transmitting member 640 exposed inside the liquefied gas storage tank is increased, and the temperature inside the liquefied gas storage tank can be efficiently transmitted to the temperature transmitting member 640.

In another embodiment of the present invention, the second insulator 635 above the inner space 627 may not be formed. That is, the inner space 627 and the inner wall 610 may directly contact.

 Superconductor 630 is La-Ba-Cu-O-based, Y-Ba-Cu-O-based, Bi-Sr-Ca-Cu-O-based, Ti-Ba-Ca-Cu-O-based, Hg-Ba-Ca -Cu-O system and the like. However, the material included in the superconductor 630 is not limited thereto. The superconductor 630 may have a coil shape. For example, the superconductor 630 may have a solenoid shape, a toroid shape, or the like. The coil-shaped superconductor 630 may be disposed along the inner wall, unlike the illustrated. When a current flows through the coil-shaped superconductor 630, a strong magnetic field is generated, and since the superconducting coil has no electric resistance, there is no energy loss due to heat generation, thereby maintaining a strong magnetic field continuously. The superconductor 630 may be connected to an external electrical system controller (not shown) by the wire 645.

In one embodiment of the present invention, the device for sending a current to the superconductor 630 may be a power generation device using the vaporized gas of the liquefied gas storage tank. The vaporized gas may be used as a fuel to generate high pressure and high temperature steam, and the turbine generator may be used to generate power by using the steam. Alternatively, the device for sending a current to the superconductor 630 may include a variety of power generation device, it is not limited to the power generation device using the vaporization gas.

8 is a cross-sectional view of an electrical system according to an embodiment of the present invention.

Referring to FIG. 8, the electrical system 800 may include a superconducting coil 810, a magnetic line dense member 820, a rotating member 830, a conductive wire 840, and a temperature transmitting member 850. Electrical system 800 may be disposed, for example, within liquefied gas storage tank 110 (FIG. 1). That is, it may be formed in the protruding spaces 315 and 415 inside the liquefied gas storage tanks 300 and 400, as shown in FIG. 3 or 4. Accordingly, the temperature of the liquefied gas storage tanks 300 and 400 is transferred to the electrical system 800 so that the temperature of the electrical system 800 can be maintained at an ultra low temperature, for example, about -160 ° C.

The superconducting coil 810 may be disposed along one direction of the liquefied gas storage tank 110. The superconducting coil 810 may have a solenoid shape, a toroid shape, or the like. When a current flows through the superconducting coil 810 reaching the superconducting critical temperature, a strong magnetic field is generated, and since the superconducting coil 810 has no electric resistance, there is no energy loss due to heat generation, thereby maintaining a strong magnetic field.

The magnetic line dense member 820 may be surrounded by the superconducting coil 810. For example, the superconducting coil may surround the magnetic force line dense member 820 in a spiral shape. That is, the core may be formed in the solenoid coil. In one embodiment of the present invention, for example, the magnetic force line dense member 820 may be a rod-shaped ceramic material. When the magnetic line dense member 820 is surrounded by the superconducting coil 810, more magnetic lines may be generated around the superconducting coil 810 and inside the superconducting coil 810 than in the case where the magnetic line dense member 820 is not present. have.

The rotating member 830 may be formed to be spaced apart from the distal end of the superconducting coil 810. The rotating member 830 may be formed, for example, in the ceiling of the internal space. The rotating member 830 may be formed of a material having superconducting properties at low temperature. Superconductors have a Meissner effect at critical temperatures. That is, when the superconductor reaches a critical temperature in a state in which the magnetic force line does not pass through the superconductor, the magnetic force line may not enter the superconductor from the outside or enter the magnetic force line from the inside of the superconductor to the outside. Accordingly, the superconductor receives the floating force by the magnetic force nearby. In addition, when the superconductor reaches a critical temperature in a state where a magnetic force line passes through the superconductor, the magnetic force line that has passed through the superconductor may be isolated inside the superconductor. The superconductor may have both attractive force and repulsive force by the isolated magnetic force lines. By using the properties of the superconductor as described above, the rotating member may be attached in a state where there is little friction force on the ceiling of the internal space. That is, the inner space may be cooled to the critical temperature of the superconductor while the rotating member 830 including the material having the superconducting property is attached to the ceiling. Accordingly, the Meissner effect occurs and the rotating member 830 may be attached in a state in which the ceiling part and the attraction-repulsion force are generated at the same time and thus there is little friction force. In one embodiment of the invention, the rotating member 830 may include a superconducting magnetic bearing. Since the superconducting bearings have little friction, they can rotate without energy loss.

The conductive line 840 may be connected to the rotating member 830. For example, the conductive wire 840 may protrude from the rotating member 830 and be spaced apart from the distal end of the superconducting coil 810. The conductive line 840 may have a loop shape and may have a rectangular shape as shown in FIG. 8. For example, one end of the conductive wire 840 protrudes to the rotating member 830 to form a closed loop to have a space for the magnetic force lines generated in the superconducting coil 810 to pass, and the other end of the rotating member 830 to be spaced apart from the one end. ) Can be connected. One end and the other end of the lead 840 may be connected to an external system. The rotating member 830 and the conductive wire 840 are fixed. Accordingly, the conductive wire 840 may also rotate in accordance with the rotation of the rotating member 830. As the conductive wire 840 rotates, a magnetic force line changes within the space surrounded by the conductive wire 840, whereby a current flows in the conductive wire 840 (electromagnetic induction law). The induced current can flow to an externally connected system.

The power generation system 500 and the charging system 600 may be simultaneously arranged in one liquefied gas storage tank. Alternatively, among a plurality of liquefied gas storage tanks, a power generation system 500 may be disposed in some liquefied gas storage tanks, and a filling system 600 may be disposed in other liquefied gas storage tanks.

Some of the temperature transfer member 850 may be exposed inside the liquefied gas storage tank and some may be exposed to the interior space. Accordingly, the temperature transmitting member 840 may allow the temperature inside the liquefied gas storage tank to be transferred to the superconducting coil 810. Wrinkles may be formed on the surface of the temperature transmitting member 850 exposed inside the liquefied gas storage tank. Accordingly, the surface area of the temperature transmitting member 850 exposed inside the liquefied gas storage tank is increased, and the temperature inside the liquefied gas storage tank can be efficiently transmitted to the temperature transmitting member 850.

Although the present invention has been described with reference to the embodiments shown in the drawings, these are merely exemplary, and those skilled in the art will understand that various modifications and equivalent other embodiments are possible. For example, some components of the embodiments described with reference to FIGS. 5, 6 and 8 may be combined to form other embodiments. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

110, 210a, 210b, 210c, 300, 400: liquefied gas storage tank
120, 220a, 220b, 220c, 330, 430, 500, 600, 800: electrical system
130, 230a, 230b, 230c, 230d: electrical system control unit
305: chamfer 540, 630: superconductor
560: rotating body 555: first magnetic body
565: second magnetic body 570: driving coil
580: coil for power generation 710: primary barrier
720: first insulating layer 730: secondary barrier
740: second insulating layer 810: superconducting coil
830: rotating member 840: conducting wire

Claims (10)

Liquefied gas storage tanks; And
And an electrical system disposed inside said liquefied gas storage tank and using a superconductor cooled by liquefied gas stored within said liquefied gas storage tank.
The method of claim 1,
The electrical system comprises a power generation system.
The method of claim 2,
The power generation system includes a magnetic body spaced apart to face the superconductor, and a drive coil and a power generation coil spaced apart from the magnetic body and disposed around the magnetic body.
4. The liquefied gas transportation ship according to claim 3, wherein the magnetic body is floated by the superconductor, and rotates on the superconductor to generate electricity through the power generation coil.
The method of claim 3, wherein
Further comprising a generator for producing electric power using the vaporized gas generated from the liquefied gas storage tank,
And the electrical system is in electrical connection with the generator.
The method of claim 1,
The electrical system comprises a filling system.
The method according to claim 6,
Further comprising a generator for producing electric power using the vaporized gas generated from the liquefied gas storage tank,
And the electrical system is in electrical connection with the generator.
8. A liquefied gas transport ship according to any one of the preceding claims further comprising a projection formed on an inner surface of the liquefied gas storage tank, wherein the electrical system is disposed inside the projection.
The method of claim 8,
An edge portion of the liquefied gas storage tank includes a chamfer formed to be inclined, and the protrusion is formed in the chamfer.
The method of claim 1,
The superconductor includes a superconducting coil, and the electrical system is spaced apart from the distal end of the superconducting coil and is connected to the conducting wire surrounding the inner space through which the magnetic force line passes and the conducting wire so that the magnetic force line passing through the inner space is changed. Liquefied gas transport ship comprising a rotating member for rotating.

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