KR101606563B1 - Floating structure mounted fuel gas tank on deck - Google Patents

Abstract

The present invention relates to a floating structure capable of increasing the storage capacity of a fuel tank and minimizing the installation area of a drip tray by tilting the bottom surface of the fuel tank mounted on the deck.
According to the present invention there is provided a floating structure having a fuel tank for storing a liquefied fuel gas for use as a fuel, the fuel tank being installed on a deck of the floating structure and having at least one direction And a sloped portion inclined with respect to the slant surface is formed.

Description

{FLOATING STRUCTURE MOUNTED FUEL GAS TANK ON DECK WITH FUEL TANK ON THE DEPARTMENT}

The present invention relates to a floating structure in which a fuel tank is mounted on a deck, more specifically, to a fuel tank mounted on an upper deck to increase the storage capacity of the fuel tank, The present invention relates to a floating structure capable of minimizing an installation space.

In recent years, discussions on carbon emission regulations have been actively conducted in order to solve environmental problems such as global warming and environmental pollution. In Korea, environment-friendly industrial policies such as low-carbon green growth of the government are emerging.

In the shipbuilding industry, efforts are underway to reduce CO2 emissions due to the use of existing fossil fuels.

In other words, in general, various types of ships such as bulk carriers, container ships, passenger ships, etc. employ a fuel supply system using heavy oil (HFO) such as Bunker C oil or diesel oil (MDO), which is a liquid fuel.

There is a problem that environmental pollution due to various harmful substances contained in exhaust gas is serious when heavy oil or the like used as fuel in such a conventional fuel supply system is burned. Since the demand for the prevention of environmental pollution is being strengthened all over the world, the regulations on the propulsion devices using the middle fuel flow channel are also strengthened, and the cost for meeting these regulations is gradually increasing.

In addition, when the oil price rises due to the exhaustion of fossil fuels or unstable local conditions, there are various operational problems such as the problem that the fuel cost of the ship using heavy oil as the fuel increases sharply.

Therefore, technology to use liquefied fuel gas, which is an environmentally friendly fuel, as a fuel for ships has recently come into the spotlight. In this specification, the liquefied fuel gas refers to gas fuel such as LNG, LPG, CNG, DME or the like which is in a liquid state or a gas state when being stored in a fuel tank but is in a gaseous state when supplied to a propulsion device.

LNG, or Liquefied Natural Gas, is a liquefied natural gas extracted from a gas field and mainly composed of methane. When LNG is lowered in temperature or liquefied under pressure, the volume is reduced to about 1/600, which is advantageous in terms of space efficiency. However, the boiling point is about minus 162 degrees Celsius, so it is charged in a specially insulated tank or vessel for transportation and storage, .

LPG, or Liquefied Petroleum Gas, is used to collect crude oil from crude oil or to recover heavy hydrocarbons (2 or more carbon atoms) from crude oil or relatively heavy hydrocarbons (6 To 7 kg / cm < 2 >). The volume is reduced to approximately 1/250 during liquefaction, which is convenient for storage and transportation. Its main constituents are propane and butane, and may contain small amounts of ethane, propylene, butylene, and the like.

CNG, or Compressed Natural Gas, is compressed to about 200 atmospheres to use natural gas as fuel.

DME, or dimethyl ether (DME), is a kind of ether. It is less flammable than LPG and is non-toxic and has a high oxygen content.

Among the above-mentioned liquefied fuel gas, in particular, when the LNG is used as a fuel for ships, the carbon dioxide emission is 20% or less as compared with petroleum-based fuels such as diesel fuel and Bunker C oil. Furthermore, nitrogen oxides and sulfur oxides, the major pollutants of air pollution, are rarely released and can be eco-friendly fuels.

In the case of LNG carriers, many discussions have been recently made on the technology of engine using BOG (Boil off Gas). In addition, the technology that uses only liquefied fuel gas including LNG as ship propulsion fuel is in the early stage and many discussions are needed in the future.

Generally, since the liquefied fuel gas such as LNG is denser than the liquid fuel such as HFO, the volume of the fuel tank is inevitably larger than the case of using only the relatively dense liquid fuel. Therefore, in the case of storing the fuel tank for the liquefied fuel gas inside the hull, the space for cargo loading must be smaller than the case of storing the fuel tank for the liquid fuel such as the HFO.

To solve this problem, it is possible to consider a detachable fuel tank which can remove a part of a plurality of fuel tanks when the amount of fuel used is small, or a method of installing a fuel tank on a deck of a floating structure.

Among the above-mentioned methods, in particular, the present invention is characterized in that a fuel tank capable of storing a liquefied fuel gas is mounted on an upper portion of a deck and a slope is provided on a bottom surface of the fuel tank to increase the storage capacity of the fuel tank, In order to minimize the size of the floating structure.

According to an aspect of the present invention, there is provided a floating structure having a fuel tank for storing a liquefied fuel gas for use as fuel, the fuel tank being installed on a deck of the floating structure, And at least one inclined portion is formed on the surface.

Wherein the inclined portion formed on a bottom surface of the fuel tank is parallel to a surface of the deck.

The distance between the bottom surface of the fuel tank and the deck is preferably kept constant.

Preferably, the fuel tank is installed at a longitudinal central axis of the deck, and the inclined portion is symmetrical with respect to a longitudinal central axis of the deck, and the bottom surface of the fuel tank is lower toward the left and right strings.

Here, a collecting container capable of collecting the fuel leaked from the fuel tank is installed on the bottom of the bottom of the fuel tank, and the collecting container is preferably disposed on each of the left and right side edges of the bottom surface.

Side fuel tank and the port side fuel tank are disposed in the longitudinal direction of the deck, the bottom surface of the starboard fuel tank is lowered toward the starboard side, It is preferable that the bottom surface of the port side fuel tank becomes lower toward the port side.

Wherein a collecting container capable of collecting the fuel leaked from the fuel tank is installed in a lower portion of the bottom surface of the fuel tank and the collecting container is provided on the starboard side of the starboard fuel tank and the port side of the port side fuel tank It is preferable that at least one of them is disposed.

Wherein the bottom surface of the starboard fuel tank and the bottom surface of the port side fuel tank are symmetrical.

Preferably, at least one fuel tank is installed along the longitudinal direction of the deck.

The fuel tank is preferably a stand-alone tank.

And a collecting container capable of collecting fuel leaked from the fuel tank is installed at a lowest portion of the bottom surface of the fuel tank.

According to another aspect of the present invention, there is provided a floating structure having a fuel tank for storing a liquefied fuel gas for use as a fuel, wherein the fuel tank is installed on a deck of the floating structure, And a sloped portion inclining in at least one direction is formed.

And a collecting container capable of collecting fuel leaked from the fuel tank is installed at a lowest portion of the bottom surface of the fuel tank.

According to the present invention as described above, the fuel tank capable of storing the liquefied fuel gas is mounted on the upper part of the deck and the fuel tank bottom surface is inclined to increase the storage capacity of the fuel tank, It is possible to provide a floating structure capable of minimizing the size of the substrate.

Accordingly, it is possible to maximize the loading capacity of the liquefied fuel gas while satisfying the installation condition in which the fuel tank is spaced from the upper portion of the deck by a predetermined distance, and the cost of reducing the cost Lt; / RTI >

1 is a schematic cross-sectional view of a floating structure having a fuel tank mounted on a deck according to a first embodiment of the present invention;
2 is a schematic sectional view of a floating structure having a fuel tank mounted on a deck according to a second embodiment of the present invention;
3 is a schematic cross-sectional view of a floating structure for comparative explanation of a first embodiment of the present invention.
4 is a schematic cross-sectional view of a floating structure for comparative explanation of a second embodiment of the present invention;
5 is a view showing a modification of the first embodiment and the second embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a floating structure in which a fuel tank is mounted on a deck according to a preferred embodiment of the present invention will be described in detail with reference to the drawings.

Figures 1 and 2 show schematic cross-sectional views of various embodiments of a floating structure with a fuel tank mounted on top of the deck.

21 and 23 may be provided on the deck 4 of the floating structure as shown in Figs. 1 and 2. The bottom surfaces of the fuel tanks 11, 21 and 23 may be inclined The surfaces of the deck 4 and the slopes 12, 13, 22 and 24 can be parallel to each other. Although only the inclined portions 12, 13, 22 and 24 and the surface of the deck 4 are parallel to each other in the figure, the inclined portions 12, 13, 22 and 24 are not linear but curved The distance between the inclined portions 12, 13, 22, 24 and the deck 4 can be kept constant. Also, even if the slopes 12, 13, 22, 24 have a portion that tilts in more than one direction, the distance between the decks 4 can be kept constant as well.

The term "floating structure" as used herein refers to various types of ships such as bulk carriers, container ships, passenger ships, crude oil carriers and the like, marine plants such as oil FPSO, LNG FPSO, and LNG FSRU that are usually moored at one point in the sea .

Each fuel tank 11, 21, 23 also includes a suitable level of insulation and sealing system depending on the type of fuel to be accommodated. Particularly, a fuel tank for containing liquefied gas such as LNG or LPG may be a membrane-type or a stand-alone tank used in the field of liquefied gas storage tanks.

A lid 10 for protecting the fuel tanks 11, 21 and 23 may be provided outside the fuel tanks 11, 21 and 23. The lid 10 can be installed so as to isolate the fuel tanks 11, 21 and 23 from the outside and the fuel tanks 11, 21 and 23 and the lid 10 are spaced apart from each other.

1, according to the first embodiment of the present invention, one or more fuel tanks 11 capable of receiving liquefied gas can be installed along the longitudinal central axis of the deck 4 of the hull 1 And the port inclined portion 12 and the rightward inclined portion 13 may be formed on the bottom surface of the fuel tank 11. [ At this time, the inclined portion 12 and the inclined portion 13 are symmetrical with respect to the longitudinal center axis of the deck 4, and the inclined portion 12 of the inclined portion 12 is inclined with respect to the bottom surface of the fuel tank 11 And the star-slope portion 13 can be formed so that the bottom surface of the fuel tank 11 becomes lower toward the starboard side.

When the fuel leaks from the fuel tank 11, the leakage liquid flows to the starboard side in the port inclined portion 12 along the bottom surface of the fuel tank 11 and to the starboard side in the starboard inclined portion 13. Therefore, the leakage liquid can be collected efficiently by arranging one or more collecting containers (7) only on the left and right side edges of the bottom surface of the fuel tank (11).

A storage tank 5 for storing and transporting the cargo can be installed in the inside of the hull 1. In this storage tank 5, the same cargo as the liquefied gas for fuel stored in the fuel tank 11 can be accommodated. However, there is a difference in that the liquefied gas stored in the storage tank 5 is not used as fuel but stored as a cargo.

3, when there is no inclined portion on the bottom surface of the fuel tank 31, a large number of collection containers 7 are required to be installed on the bottom surface of the fuel tank 31, It is difficult to collect an effective leak because the leak does not collect at the edge of the slope. In the case of a stand-alone type tank, which is an example of the preferred embodiment of the present invention, it is installed so as to be spaced apart from the floor by a predetermined distance. If there is no inclination on the bottom surface of the fuel tank 31 when the deck 4 is inclined, And the bottom surface of the fuel tank 31, the storage capacity of the fuel tank 31 must be reduced. That is, the storage capacity is reduced as the distance between the deck 4 and the bottom surface of the fuel tank 31 becomes larger due to the absence of inclined portions at the port side and the starboard side of the bottom surface of the fuel tank 31.

In the case where the bottom surface of the fuel tank 31 has a straight line shape without inclined portions, the storage capacity of the fuel tank must be smaller than that of the case of Fig.

The upper surface of the support table 8 is formed so as to have the same slope as the inclination of the ported inclined portion 12 or the rightward inclined portion 13 since it directly contacts the ported inclined portion 12 or the rightward inclined portion 13 The fuel tank 11 can be stably supported.

2, the fuel tanks 21 and 23 can be installed on both sides of the left and right sides of the deck 4, respectively. In the fuel tank 21, A starboard fuel tank 21 is disposed on the left side of the deck 4 and a starboard fuel tank 23 is disposed on the starboard side of the deck 4 among the fuel tanks 21 and 23.

The port fuel tank 21 and the starboard fuel tank 23 may be disposed one or more along the longitudinal direction of the deck 4, respectively. At this time, the inclined portion 22 of the port fuel tank 21 is formed so that the bottom surface of the port fuel tank 21 becomes lower toward the port side, and the inclined portion 24 of the starboard fuel tank 23 is formed so as to reach the starboard fuel tank 23 Can be formed so as to become lower toward the starboard side. The bottom surface of the port fuel tank 21 and the bottom surface of the starboard fuel tank 23 may be formed to be symmetrical with respect to each other.

When the fuel leaks from the fuel tanks 21 and 23, the leaking liquid flows into the starboard fuel tank 23 in the port on the inclined portion 22 of the port fuel tank 21 along the bottom surface of the fuel tank 21, In the oblique portion 24 of the front side. Therefore, in the case of the collecting container 7, one or more of the collecting container 7 is disposed on the bottom edge of the port-side fuel tank 21 at the port edge, and the starboard edge is provided at the bottom surface of the starboard fuel tank 23, .

As shown in FIG. 4, when there are no inclined portions on the bottom surfaces of the port fuel tank 41 and the starboard fuel tank 43, the number of the collection containers 7 must be increased on the bottom surface, In addition, it is difficult to collect effective effluent because the leaks are not collected at the edge of the slope. Further, when there is no inclined portion on the bottom surface of the port fuel tank 41 and the bottom surface of the starboard fuel tank 43, the storage capacity of the fuel tank must be smaller than that in the case of Fig. That is, as the distance between the port side of the port side fuel tank 41 and the deck 4 and the distance between the starboard side of the starboard fuel tank 43 and the deck 4 become larger, the storage capacity of the fuel tank becomes smaller .

In the case of the fuel tank storing the liquefied fuel gas, the sloshing problem necessarily arises because it is used at sea. Sloshing is a phenomenon in which a liquid material contained in a fuel tank flows when a ship moves in various sea conditions, and the wall surface of the fuel tank is severely impacted by sloshing.

Fig. 5 shows an example in which upper and lower chambers are formed at upper and lower sides of the fuel tanks 51 and 52 to reduce the sloshing load, in particular, the sloshing load in the left and right directions, An example of fuel tanks 51 and 52 is shown.

5A, a bottom surface of the fuel tank 51 where the lower chamfer 55 and the inclined portion 57 meet and a lower chamfer 55 and a rightward inclined portion 59 are formed as a modification of the first embodiment The collecting container 7 may be installed under the bottom surface of the fuel tank 51 to meet.

5 (b), a collection container 7 may be installed below the bottom surface of the port fuel tank 52, which meets with the lower chamfer 56 and the port of the inclined portion 58, as a modification of the second embodiment. In the case of the starboard fuel tank, it may be formed symmetrically with the port-side fuel tank 52, and a description thereof will be omitted.

Reference numeral 53 is an upper chamfer according to a modification of the first embodiment, and reference numeral 54 is an upper chamfer according to a modification of the second embodiment.

When the upper and lower chambers are formed in the fuel tanks 51 and 52 to solve the sloshing problem as described above, the collection container 7 is installed below the lowest part of the bottom surfaces of the fuel tanks 51 and 52 .

According to the floating structure in which the fuel tank is mounted on the deck of the present invention as described above, since the inclined portion is formed on the bottom surface of the fuel tank to be in equilibrium with the deck, the installation condition And at the same time, the storage capacity of the fuel tank can be maximized.

Further, according to the floating structure in which the fuel tank is mounted on the deck of the present invention, it is possible to effectively collect the leakage liquid leaked from the fuel tank while minimizing the installation position of the collection container.

The floating structure having the fuel tank mounted on the deck according to the present invention has been described with reference to the preferred embodiments of the present invention. However, it should be understood that the present invention is not limited to the above-described embodiments and drawings, and various modifications and changes may be made by those skilled in the art without departing from the scope of the present invention.

1: Hull 4: Deck
5: Storage tank 7: Collection container
8: Support 10: Cover
11: fuel tank 12, 57:
13, 59: starboard inclined portion 21: port fuel tank
23: Starboard fuel tank 22, 24:

Claims (13)

A floating structure having a fuel tank for storing a liquefied fuel gas for use as fuel,
Wherein the fuel tank is installed on a deck of the floating structure and one or more slopes are formed on a bottom surface of the fuel tank,
The inclined portion is formed so that the distance between the bottom surface of the fuel tank and the deck is kept constant,
Wherein the fuel tank is provided with a fuel tank,
Floating structures. delete delete The method according to claim 1,
Wherein the fuel tank is installed in a longitudinal central axis of the deck, the inclined portion is symmetrical with respect to the longitudinal central axis of the deck, and the bottom surface of the fuel tank is lowered toward the left and right strings. Expression structure. The method of claim 4,
A collecting container capable of collecting fuel leaking from the fuel tank is installed in the bottom of the bottom of the fuel tank,
Wherein at least one of the collection containers is disposed on each of left and right side edges of the bottom surface. The method according to claim 1,
Side fuel tank and the port side fuel tank are disposed in the longitudinal direction of the deck, the bottom surface of the starboard fuel tank is lowered toward the starboard side, And the bottom surface of the port side fuel tank is lowered toward the port side. The method of claim 6,
A collecting container capable of collecting fuel leaking from the fuel tank is installed in the bottom of the bottom of the fuel tank,
Wherein at least one of the collection containers is disposed on the starboard side of the starboard fuel tank and the starboard side of the port side fuel tank, respectively. The method of claim 6,
Wherein the bottom surface of the starboard-side fuel tank and the bottom surface of the port-side fuel tank are symmetrical bilaterally. The method according to claim 1,
Wherein at least one fuel tank is installed along the longitudinal direction of the deck. The method according to claim 1,
Wherein the fuel tank is a stand-alone tank. The method according to claim 1,
Wherein a collecting container capable of collecting fuel leaked from the fuel tank is installed at the lowest part of the bottom surface of the fuel tank. delete delete

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