KR101205346B1 - Ship equipped with nanogenerators using sloshing effect - Google Patents

Abstract

The present invention provides a storage tank including a fluid, a power generation unit including a plurality of nano power generation units on a surface of the storage tank in which a sloshing phenomenon of the fluid occurs, a boosting unit for boosting a voltage generated from the power generation unit, and the power generation unit; And a wiring line for electrically connecting the boosting unit and transmitting the boosted electricity to the vessel, wherein the power generation unit uses the piezoelectric effect of periodic vibration energy generated in the inner wall of the storage tank by the sloshing phenomenon of the fluid. Provides a vessel for converting into electrical energy by the power generation unit.

Description

SHIP EQUIPPED WITH NANOGENERATORS USING SLOSHING EFFECT}

The present invention relates to a ship, and more particularly, to a ship having a nano-generator for generating power using a sloshing phenomenon.

In general, various types of ships are in operation for transporting liquid cargo by sea. For example, in order to transfer liquid cargoes such as liquefied natural gas (LNG), liquefied petroleum gas (LPG), crude oil, liquefied carbon dioxide, and water, a carrier or storage vessel constructed according to each cargo characteristic is operated. It is becoming. Here, storage vessels are offshore oil-drilling platforms in the form of ships, floating gas or crude oil production and storage facilities (FPSO), crude oil drilling vessels, gas drilling vessels, floating liquefied gas storage and regasification facilities (LNG-). Production storage vessels such as FSRU) may be collectively referred to.

Since the carrier or production storage ship operates the sea while storing the liquid cargo, it has a special type of storage tank that can be sealed, for example, a low temperature LNG tank, a high pressure carbon dioxide storage tank or an oil tank.

Here, one of the main design conditions in manufacturing such a storage tank is the sloshing phenomenon. The sloshing phenomenon refers to the behavior of a fluid in which the liquid cargo receives kinetic energy continuously due to the movement or fluctuation of the hull, causing the liquid cargo having a free surface to shake rapidly, causing a strong impact on the inner wall of the storage tank.

The sloshing phenomenon proceeds by the condensation of liquid cargo in the same direction. Thus, the greater the degree of liquid condensation, the greater the impact load when it hits the wall of the storage tank.

For example, in the case of the membrane-type storage tank 100 for storing liquefied natural gas, as shown in FIGS. 1A to 1C, the sloshing phenomenon is a cargo as shown in FIG. In the case where the loading amount of the fuel cell is medium and the loading amount of the cargo is low as shown in FIG. 1C, the liquid liquid cargo hits the ceiling, the chamfer portion or the tank wall of the storage tank 100 quickly and strongly.

Conventionally, ships with storage tanks capable of minimizing sloshing by estimating the flow and pressure caused by such impacts and at the same time withstand the expected sloshing load are continuously designed, but are stored in accordance with the trend of larger vessels. Due to various reasons such as the enlargement of the tank, it is difficult to substantially solve the sloshing phenomenon.

In the above situation, the present invention has been conceived from the viewpoint of using the vibration energy generated due to the sloshing phenomenon usefully. Specifically, the present invention is a shock energy or vibration energy applied to the surface of the storage tank, for example, the ceiling in the storage tank, the chamfer portion, etc. due to the sloshing phenomenon occurring in the storage tank due to the movement of the hull as an electrical energy. By providing a nano-generator applying a piezoelectric element that can be switched, there is provided a ship having a nano-generator using a sloshing phenomenon that can use the generated electrical energy for the power demand of the vessel.

In order to achieve the above object, a vessel according to an embodiment of the present invention is a storage tank containing a fluid, a power generation unit having a plurality of nano-generation units on the surface of the storage tank, a boosting unit for boosting the voltage generated from the power generation unit And a wiring line that electrically connects the power generation unit and the boosting unit and transmits the boosted electricity to the ship, wherein the power generation unit transmits the impact energy applied to the inner wall of the storage tank by the sloshing phenomenon of the fluid by the nano power generation unit. Convert to energy.

Here, the plurality of nano-generation units may be arranged in a matrix structure on the surface of the storage tank.

At this time, the nano-generation unit may be attached and installed on the rear surface of the inner surface of the storage tank.

In addition, the nano-generation unit may be attached and installed on the inner surface of the storage tank.

In addition, the plurality of nano-generation units arranged in a matrix structure, electrically connecting the nano-generation units belonging to the same row or column in series through a wiring line, and electrically connecting neighboring rows or columns in parallel through the wiring line. It may have a structure.

In addition, nano-generation units connected in series or in parallel can be encapsulated with a coating layer made of an insulating material that can be protected at cryogenic temperatures.

At this time, the heat insulating material for coating the plurality of nano-generation unit may be an airgel.

In addition, the storage tank is a membrane-type storage tank for storing liquefied natural gas, the membrane-type storage tank includes a primary barrier having an inner wall surface of the storage tank and protruding wrinkles, the nano-generation unit is a primary It can be attached and installed on the back of the barrier.

Here, the nano power generation unit may be attached and installed on the back surface between the wrinkles of the primary barrier.

The storage tank may also be a ballast tank for storing sea water or fresh water or an oil tank for storing oil.

Ships equipped with a nano-generator using the sloshing phenomenon according to an embodiment of the present invention, the electric energy by using a nano-generator to which the piezoelectric element is applied the impact energy due to the sloshing phenomenon generated in the storage tank due to the movement of the hull. By switching to, it can be used to supply the electricity needed for the vessel. As a result, it is possible to provide energy-friendly ships that can maximize energy efficiency by recycling energy.

1A to 1C are diagrams for explaining a sloshing phenomenon of a general cargo hold.
2 is a schematic cross-sectional view showing a configuration and an operation relationship of a ship according to an embodiment of the present invention.
3 is a cross-sectional view schematically showing a configuration of a nano power generation unit constituting a power generation unit of a ship according to the embodiment of the present invention.
4A and 4B are examples of applying a plurality of nano-generation units to a storage tank of a ship according to an embodiment of the present invention. FIG. 4A is a cross-sectional view of a membrane type storage tank of a LNG vessel, and FIG. 4B is a membrane type. An enlarged cross-sectional view of a portion ('A' portion of FIG. 4A) of a storage tank.
5 is a view showing an example of the arrangement of a plurality of nano-generation units of the power generation unit provided on the surface of the storage tank.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In addition, in describing the present invention, when it is determined that the detailed description of the related well-known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.

2 is a schematic cross-sectional view showing a configuration and an operation relationship of a ship according to an embodiment of the present invention. First, the ship 10 according to the present embodiment is the power generation unit 200 provided on the surface of the storage tank 100 containing the fluid, the boosting unit 300 for boosting the voltage produced from the power generation unit 200, the power generation It is composed of a wiring line 400 for electrically connecting the unit 200 and the boosting unit 300. In addition, the electrical energy produced from the power generation unit 200 is passed through the boosting unit 300, if necessary, for example, after being directly transmitted to the main switch board or to a charging unit (not shown) provided separately to the outside It can be used as internal power of the vessel 10.

The power generation unit 200 includes a plurality of nano power generation units for converting the impact energy applied to the inner wall of the storage tank by the sloshing phenomenon of the fluid into electrical energy using the piezoelectric effect. The power generation unit 200 is attached to and installed in the storage tank 100, and may be installed at a position capable of receiving an impact applied to the storage tank 100 due to a sloshing phenomenon. 2 illustrates a state in which the power generation unit 200 is attached to and installed in the storage tank 100, and is not necessarily limited to the power generation unit 200 being attached to an outer surface of the storage tank 100. Impact energy applied to the inner wall of the storage tank by the sloshing phenomenon may be periodic or irregular. That is, the impact energy may be periodic vibration energy when the sloshing phenomenon is a periodic fluctuation of the ship due to digging or the like. In addition, in the case of the sloshing phenomenon caused by the irregular wave of the vessel due to the temporary wave or rocking, the impact energy may be irregular. Here, each nano power generation unit is electrically connected by internal and external connection wires, which will be described later.

3 is a cross-sectional view schematically showing the configuration of the nano-generation unit 210 constituting the power generation unit 200 of the vessel 10 according to the embodiment of the present invention. The nano power generation unit 210 is a generator using a piezoelectric effect of changing mechanical energy into electrical energy through a piezoelectric body such as crystal or ceramic, and the nano power generation unit 210 is a piezoelectric body 212 on the lower electrode 213. A plurality of nanowires having a length of 1 to 10 µm and a width (or diameter) of 50 to 300 nm are vertically arranged, and the upper electrode 211 is disposed on the nanowires as the piezoelectric body 212. The lower electrode 213 is formed of a semiconductor substrate or a glass substrate, and may be made of a thin or well bent polymer substrate or plastic substrate in order to secure flexibility of the nano power generation unit 210. The upper electrode 211 may be made of a conductive material, for example, a metal, or may be an oxide or organic material having conductivity. The nano wire 212 may be, for example, a nano wire made of a zinc oxide material.

The nano power generation unit 210 has a physical structure in which the nano wires 212 between both electrodes are physically applied when periodic sound waves, pressures, and mechanical vibrations applied to the upper electrodes 211 by the nano wires 212 on the lower electrode 213. This causes shrinkage, expansion or warpage, electricity is generated in proportion to the displacement, and energy is generated by generating electricity through both electrodes 211 and 213. An upper parallel terminal (not shown) and a lower parallel terminal (not shown) may be installed in the upper electrode 211 and the lower electrode 213 to connect the generated electricity to the outside, respectively.

4A and 4B illustrate an example in which a plurality of nano power generation units 210 according to an embodiment of the present invention are applied to a storage tank 100 of a vessel 10, and FIG. 4A is a membrane type storage of a LNG vessel. 4 is an enlarged cross-sectional view of a portion ('A' portion of FIG. 4A) of the membrane type storage tank 100.

The storage tank according to the present embodiment may be a storage tank of a liquefied natural gas ship carrying an ultra low temperature liquefied natural gas of about -162 ° C. Such storage tanks are of a spherical type (Moss Type) and a membrane type (Membrane Type). The storage tank shown in Figures 4a and 4b is a membrane-type storage tank 100, the membrane-type storage tank 100 has a larger loading capacity and easier to maintain and manufacture the stability of the cargo compared to the older type Most widely used.

First, the structure of the membrane type storage tank 100 will be described with reference to FIG. 4B. In general, the membrane-type storage tank 100 has a double barrier structure in order to safely store and seal the liquefied natural gas (G), and the membrane metal panel, which is the primary barrier 110 directly contacting the liquefied natural gas, is inside. It is provided in the structure, and has a structure including the secondary barrier 140 formed to surround the outside.

Specifically, the storage tank 100 is formed of stainless steel and forms an inner wall surface of the storage tank 100 to provide a primary barrier 110 and a primary barrier to provide a storage space for the liquefied natural gas (G). It is provided on the outside of the 110, the primary heat insulating layer 130 and the secondary heat insulating layer 150 for insulating the LNG storage space of the storage tank 100, the primary heat insulating layer 130 and the secondary heat insulating layer ( It is formed in a triplex between the 150 and comprises a secondary barrier 140 for preventing the leakage of the liquefied natural gas (G) when the primary barrier 110 is broken. In addition, the secondary barrier 140 includes a rigid triplex 141 disposed at a distance from each other and a triple triplex 142 disposed inside the rigid triplex and sealing a space between the rigid triplexes. The primary heat insulation layer 130 includes a heat insulation panel 131 attached to the inside of the rigid triplex 141 and a bridge panel 132 provided between the heat insulation panel 131 and disposed inside the supple triplex. Included. In addition, the storage tank 100 is provided with a fixing plate 160 on the outer surface of the secondary heat insulation layer 150 to be fixed to the inner wall of the ship 10. In addition, the anchor strip 120 is provided on the insulation panel 131 is coupled at the time of shipment from the factory.

In addition, the primary barrier 110, the wrinkles protruded inwardly of the storage tank 100 in order to prevent damage to the primary barrier 110 due to heat shrinkage due to contact with the cryogenic liquefied natural gas The part 111 is formed. The wrinkles 111 prevent expansion of the primary barrier 110 by expanding or contracting according to temperature change.

The nano power generation unit 210 according to the present embodiment may be installed on the rear surface (tank outer surface) of the primary barrier 110. Specifically, the anchor strip 120 is provided between the insulation panel 131 and the primary barrier 110, the predetermined thickness of the anchor strip 120 when welding the primary barrier 110 to the insulation panel 130. Gaps are formed. Since the thickness of the nano-generation unit 210 is formed to a thickness (about 50 ~ 300nm) much smaller than the thickness of the anchor strip 120, it is possible to arrange the nano-generation unit 210 in the interval. In addition, the pleats 111 may cause significant plastic deformation due to the dynamic load (impact load) of the fluid applied by the liquefied natural gas. The nano power generation unit 210 may be provided in plurality on the rear surface of the primary barrier 110 between the pleats 111 of the primary barrier 110.

In addition, in order to protect the plurality of nano-generation units 210 from cryogenic liquefied natural gas, the film layer 220 may be formed and protected by a heat insulating material having a low thermal conductivity, for example, an airgel. The nano power generation unit 210 is surrounded by such a coating layer 220 and is insulated, and also can be installed on the outer side of the storage tank 100, that is, the back surface of the primary barrier 110, so that pressure and cryogenic contact directly. Can be prevented.

In addition, the nano-power generation unit 210 is attached to the back surface of the primary barrier 110 through the adhesive layer 230 resistant to low temperature and brittleness between the primary barrier 110 and the coated nano power generation unit 210. Make it possible.

In addition, a wiring line (not shown) for electrically connecting the plurality of nano power generation units 210 may be installed in the pleats 111 of the primary barrier 110 protruding inwardly of the storage tank 100. Do. Here, since the wiring line is provided inside the pleats 111, it can be installed without affecting other structures.

Looking at the specific development principle of the present embodiment, when the liquefied natural gas storage tank 100 in which the liquefied natural gas (G) is stored is transported by a transport means, such as the vessel 10, rolling, pitching of the vessel occurring during transportation Waves may occur on the surface of the stored liquefied natural gas G by a movement such as the like. This phenomenon is called a sloshing phenomenon, and the sloshing phenomenon is substantially all surfaces of the primary barrier 110, specifically, the front / rear surface (the 'A' portion of FIG. 2), the ceiling surface, the bottom surface, and the top / bottom. A large impact force is applied to the chamfer (the 'A' portion of FIG. 4A). Due to the sloshing phenomenon, the plurality of nano-generation units 210 having vibration energy generated on the inner wall of the storage tank 100, that is, on the inner surface of the primary barrier 110, are attached to the rear surface of the primary barrier 110. The electrical energy is converted into electrical energy by the effect, and the converted electrical energy is transmitted to the boosting unit 300 through the upper / lower parallel terminals provided at both electrodes 211 and 213 of each nano power generation unit 210, and the wiring line ( Is transmitted inside the vessel through 400).

FIG. 5 is a view showing an example of an arrangement of a plurality of nano power generation units 210 of a power generation unit 200 attached to and installed on a surface of a storage tank 100 and, in this embodiment, on a rear surface of a primary barrier 110. to be.

As shown in FIG. 5, the nano power generation unit 210 may be arranged on the surface of the storage tank 100, for example, in a matrix structure. In addition, the electrical connection between the nano-generation unit 210 is electrically connected to the nano-generation unit belonging to the same row or column of the plurality of nano-generation unit 210 arranged in a matrix structure through a wiring line (internal connection wire 250). It can be connected in series, and a structure in which neighboring rows or columns are electrically connected in parallel through a wiring line (external connection wire 260). Specifically, after connecting the nano-generation unit 210 within a predetermined distance in series by the internal connection wire 250, to form a coating layer 220 with an aerogel, such as a heat insulating material, each of the nano-generated unit ( 210 is connected in series by an external connection wire 260, and then a plurality of groups of nano power generation units 210 are connected in parallel to boost the voltage generated in the nano power generation unit 210 through the wiring line 400. It may be transmitted to the unit 400 or the charging unit (not shown). The parallel structure of the plurality of nano-generation unit 210 as described above is suitable as a structure for maximizing the magnitude of the voltage generated in each nano-generation unit 210. However, the present invention is not limited to the above structure, and for example, various arrangement structures such as a structure in which the nano power generation units 210 connected in parallel are connected in parallel or in series and transmitted through the wiring line 400 are possible. Do.

In addition, this invention is not limited to the said embodiment, A various deformation | transformation is possible. For example, although the present embodiment describes a membrane type storage tank 100, the present invention is not limited thereto, and all tanks capable of storing a fluid capable of generating a sloshing phenomenon, for example, ballasts. Applicable to tanks, oil tanks, etc. In the case of the ballast tank or oil tank, since the storage fluid is not ultra-low temperature, unlike the liquefied natural gas, the nano power generation unit 210 has little influence due to pressure and temperature, so that the nano power is generated on the inner surface of the storage tank. It is also possible to install the unit 210. In this case, more efficient energy harvesting is possible.

In addition, although the said embodiment shows the example which protrudes the primary barrier 110 in the inward direction of the storage tank 100, and forms the wrinkle part 111 of the primary barrier 110, it is not limited to this. For example, the primary barrier 100 may be formed to protrude in the outward direction of the storage tank 100. In this case as well, it is possible to attach and install the nano power generation unit 210 on the back surface of the primary barrier 110 between the pleats 111.

As described above, the ship according to the present invention converts the vibration energy generated periodically by the sloshing phenomenon occurring in the storage tank due to the movement of the hull into electrical energy by using a nano-generator applying a piezoelectric element, Energy can be recycled and used to supply the electricity needed to provide energy-efficient eco-friendly vessels.

The present invention has been described above with reference to specific embodiments of the present invention, but this is only illustrative and does not limit the scope of the present invention. Skilled artisans may modify or vary the embodiments described within the scope of the present invention. Each component described in the present specification may be implemented or replaced with various known configurations, and each component may be implemented separately or two or more may be integrated into one. Each component described herein may be implemented or replaced by a variety of known elements, each may be implemented separately, or two or more may be integrated into one. Accordingly, the scope of the invention should be defined by the appended claims and their equivalents, rather than the described embodiments.

10: Shipping
100: storage tank
110: primary barrier
130: primary insulation layer
140: secondary barrier
150: secondary insulation layer
200: power generation unit
210: nano power unit
211: upper electrode
212: piezoelectric
213: lower electrode
220: film layer
300: booster
400: wiring line

Claims (10)

A storage tank containing fluid;
A power generation unit including a plurality of nano power generation units on a surface of the storage tank;
A booster boosting a voltage generated from the power generator; And
A wiring line electrically connecting the power generation unit and the boosting unit and transmitting the boosted electricity to the inside of the ship,
The power generation unit converts the impact energy applied to the inner wall of the storage tank by the sloshing phenomenon of the fluid into electrical energy by the nano-generation unit,
The plurality of nano-generation units are arranged in a matrix structure on the surface of the storage tank, the plurality of nano-generation units arranged in the matrix structure, the nano-generation units belonging to the same row or column electrically connected in series through a wiring line And a structure in which neighboring rows or columns are electrically connected in parallel through wiring lines, and the nano-generation units connected in series or in parallel are coated with a coating layer made of an insulating material that can be protected at cryogenic temperatures.
Vessel with nano-generator using sloshing phenomenon.
delete The method of claim 1,
The nano power generation unit is attached to and installed on the rear surface of the inner surface of the storage tank
Vessel with nano-generator using sloshing phenomenon.
The method of claim 1,
The nano power generation unit is attached to and installed on the inner surface of the storage tank
Vessel with nano-generator using sloshing phenomenon.
delete delete The method of claim 1,
Insulating material for coating the plurality of nano-generation unit is an airgel
Vessel with nano-generator using sloshing phenomenon.
The method of claim 3, wherein
The storage tank is a membrane type storage tank for storing liquefied natural gas,
The membrane type storage tank includes a primary barrier having an inner wall surface of the storage tank and having protruding wrinkles, and the nano-generation unit is attached to and installed on a rear surface of the primary barrier.
Vessel with nano-generator using sloshing phenomenon.
The method of claim 8,
The nano power generation unit is attached to and installed on the back surface between the wrinkles of the primary barrier
Vessel with nano-generator using sloshing phenomenon.
The method of claim 4, wherein
The storage tank is a ballast tank for storing sea water or fresh water or an oil tank for storing oil.
Vessel with nano-generator using sloshing phenomenon.

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