KR20200089083A - Layout Structure of LNG Fuel Tank in Container Ship - Google Patents

Abstract

The present invention provides a structure for arranging an LNG fuel tank of a container ship, which includes: a hull on which containers are shipped; and a plurality of LNG fuel tanks in which LNG fuel is stored and which has a shape in which a vertical height is smaller than a horizontal width and a forward and backward length is greater than the vertical height and the horizontal width, wherein the LNG fuel tanks are received in a tank shell formed on a hull central portion of the ship bottom of the hull. Therefore, the structure for arranging an LNG fuel tank of a container ship capable of increasing the strength of the tank shell can minimize a pipeline for supplying the fuel, disperse a load, improve the insufficient longitudinal strength of the conventional supersized container ship, separate the LNG fuel tanks into four tanks to secure safety of the tanks when the ship is struck on a rock and protect the LNG fuel tanks from loaded cargos.

Description

{Layout Structure of LNG Fuel Tank in Container Ship}

The present invention relates to the arrangement structure of the LNG fuel tank in a container ship, and more specifically, on the inner bottom of the container ship, the long and flat type LNG fuel tank is independently arranged in the center of the hull and four LNG fuel tanks are supplied. At the same time, it minimizes the pipeline for distributing loads, and at the same time, it can improve the poor longitudinal strength of existing large container ships, secure the safety of the tank when the ship is stranded, and protect the LNG fuel tank from cargo. It relates to the arrangement structure of the LNG fuel tank of a container ship that can increase the strength of the shell (Tank Shell).

In general, a propulsion engine using heavy oil (HFO) (or MDO) such as bunker C oil as a fuel has been used in commercial vessels such as containers.

However, fuel supply systems using liquefied fuels (LNG, LPG, CNG, DME), which are much cheaper than heavy oils and are clean energy sources, have been spotlighted due to the recent rise in oil prices, and accordingly, as fuel oils for various ships, The trend is to use clean fuels such as LNG (or LPG, CNG, DME), which is liquefied or gaseous gas fuel, instead of using heavy oil (MDO) or with minimal amounts.

Typically, large container ships of 10,000 teu or more are placed in the center of the hull in order to secure visibility.

Due to the cabin area disposed above the upper deck of the container ship, it is impossible to load the container in the lower space, which is usually used as a liquid fuel storage tank.

However, in order to guarantee the same cruising range due to the limitation of fuel tank arrangement according to the IGF CODE (International Rules for the Construction and Installation of Bulk Liquefied Gas Carriers) and the calorific value of the liquid fuel and gas fuel, it is recommended to store the existing liquid fuel storage space. This is impossible, which in turn leads to a reduction in container loading space.

As a prior art of the above technique for solving this problem, Korean patent 10-2009-0098988 (a container ship having a fuel tank for gas fuel) to which an independent type B type is applied has been filed.

However, the biggest problem with the patent is that it is in front of the legislative IGF CODE. According to the IGF CODEDP, the shape of the fuel tank must be further reduced because the fuel tank must be located within 5/B from the side.

In addition, the loading efficiency is greatly reduced by using half of the central cargo hold with the highest container loading efficiency as a fuel tank.

And by using too many independent fuel tanks, there is a problem that the drying cost and the drying period are increased, and the width or length of the gas fuel tank is narrow and relatively high.

This has a problem in that the center of gravity of the fuel tank is high, so the wave load due to the wave is greatly affected.

In the present invention, four LNG fuel tanks are independently arranged in the center of the hull by placing a long and flat LNG fuel tank on the bottom inner plate of a container ship, while minimizing the pipeline for supplying fuel and distributing the load. Arrangement of LNG fuel tanks in container ships that can improve the poor longitudinal strength of container ships, secure tank safety when stranded, and increase the strength of tank shells that protect LNG fuel tanks from cargo. The aim is to provide a structure.

The arrangement structure of the LNG fuel tank of a container ship according to the present invention is a form in which the container is loaded, and the LNG fuel is stored, and the height in the vertical direction is smaller than the width in the left-right direction, and the length in the front-rear direction is larger than the height in the vertical direction and the width in the left-right direction. A plurality of LNG fuel tanks are included, and the LNG fuel tanks are accommodated in a tank shell formed in the center of the hull of the ship's bottom.

이내 이고, 길이가 ℓ이내 이며, 높이가

이내이다.(여기서, B는 선체의 폭이고, ℓ는 Mid-ship 구간 길이(parallel middle body)이며, D는 선체의 높이이다.)At this time, the tank shell according to the present invention has a width

Is within, the length is within ℓ, and the height is

(Where B is the width of the hull, ℓ is the length of the mid-ship section (parallel middle body), and D is the height of the hull.)

And it is preferable that the LNG fuel tank according to the present invention is arranged in the center of the hull among the bottoms of the hull by forming two sets of one pair.

이고, 길이가

이며, 높이가

이다.(여기서, B는 선체의 폭이고, ℓ는 Mid-ship 구간 길이(parallel middle body)이며, D는 선체의 높이이다.)At this time, the width of the LNG fuel tank according to the present invention

And length

And height

(Where B is the width of the hull, ℓ is the mid-ship section middle (parallel middle body), D is the height of the hull.)

이상 이격시켜 배치하는 것이 바람직하다.(여기서, B는 좌 선측에서 우 선측까지의 길이인 선체의 폭이다.)In addition, the LNG fuel tank according to the present invention is at least on the left and right side outer shell.

It is preferable to arrange them at a distance from each other (where B is the width of the hull, which is the length from the left side to the right side).

The effect produced by the arrangement structure of the LNG fuel tank of the container ship according to the present invention is as follows.

First, on the inner bottom of the container ship, a long and flat tank shell is formed in the center of the hull, and a pair of LNG fuel tanks are arranged in two tanks (4) in the tank shell, thereby supplying fuel to supply fuel. It has the effect of minimizing the pipeline than the conventional one, distributing the load at the same time, and improving the poor longitudinal strength of the existing large container ship.

Second, the LNG fuel tanks are independent of four, so that the safety of the tank can be secured when the ship is stranded, and the strength of the tank shell that protects the LNG fuel tank from the cargo is increased.

Third, the LNG fuel tank is independent of four, and when the ship is repaired, the LNG fuel tank can be detached.

1 is an exemplary view showing an arrangement of an LNG fuel tank in a container ship according to an embodiment of the present invention.
2 is an exemplary plan view showing the arrangement structure of an LNG fuel tank in a container ship according to an embodiment of the present invention.
3 is an exemplary view showing a tank shell according to an embodiment of the present invention.
4 is an exemplary view showing a comparison of a restoration moment arm of a conventional container ship and a restoration moment arm according to an embodiment of the present invention.
5 is an exemplary side view showing the arrangement structure of an LNG fuel tank in a conventional container ship.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, the terms or words used in the present specification and claims should not be construed as being limited to ordinary or lexical meanings, and the inventor appropriately explains the concept of terms to explain his or her invention in the best way. Based on the principle that it can be defined, it should be interpreted as meanings and concepts consistent with the technical spirit of the present invention.

Therefore, the embodiments shown in the embodiments and the drawings described in this specification are only the most preferred embodiments of the present invention, and do not represent all of the technical spirit of the present invention, and at the time of this application, they can be replaced evenly It should be understood that there may be variations.

In the present invention, four LNG fuel tanks are independently arranged in the center of the hull by placing a long and flat LNG fuel tank on the bottom inner plate of a container ship, while minimizing the pipeline for supplying fuel and distributing the load. LNG fuel in container ships that can improve the poor longitudinal strength of container ships, secure tank safety when stranded, and increase the strength of tank shells that protect LNG fuel tanks from loaded cargo. Regarding the tank arrangement structure, it will be described in more detail with reference to the drawings.

The arrangement structure of an LNG fuel tank in a container ship according to an embodiment of the present invention with reference to FIGS. 1 to 3 relates to an arrangement of an LNG fuel tank in a container ship in which LNG is used as fuel through a modification of fuel opening. It characterized in that the LNG fuel tank 200 is disposed in the hull center portion 110 of the ship's bottom of the ship 100.

On the other hand, the arrangement structure of the LNG fuel tank 200 according to an embodiment of the present invention is not only a container ship using LNG as fuel, but also has LNG carriers and DFDE or ME-GI engines using heterogeneous fuel while using LNG. It can be applied to all vessels used as fuel.

And according to an embodiment of the present invention, the tank for the purpose of protecting the LNG fuel tank 200 at the bottom of the hull 100 in which the LNG fuel tank 200 is disposed at the center of the hull 110 of the ship's bottom 100 A shell (Tank Shell: 120) is formed so that the ship bottom of the hull 100 has a double hull structure, whereby the ship bottom is separated from the dock to form a receiving space in which the LNG fuel tank 200 is accommodated.

이내 이고, 길이가 ℓ이내 이며, 높이가

이내(여기서, B는 선체의 폭이고, ℓ는 Mid-ship 구간 길이(parallel middle body)이며, D는 선체의 높이이다.)로 형성되어, 컨테이너 하중으로부터 LNG연료탱크(200)를 보호하는 역할을 하면서, 상기 선체(100)의 길이방향을 따라 형성됨에 따라 종부재의 역할도 하기 때문에 상기 선체(100)의 종강도도 높인다.At this time, the tank shell 120 has a width

Is within, the length is within ℓ, and the height is

It is formed within (here, B is the width of the hull, ℓ is the mid-ship section length (parallel middle body), D is the height of the hull), and serves to protect the LNG fuel tank 200 from container loading. In doing so, as it is formed along the longitudinal direction of the hull 100, it also serves as a vertical member, thereby increasing the longitudinal strength of the hull 100.

Therefore, as the tank shell 120 of the hull center portion 110 is formed among the ship bottoms of the container ship according to an embodiment of the present invention, the ship bottom of the hull 100 forms a double hull structure, and the ship bottom is made of a double hull structure. In the space formed by the LNG fuel tank 200 is disposed. In the LNG fuel tank 200, LNG used as fuel for engines, etc. installed in an engine room is stored as a cryogenic liquid, and the LNG fuel tank 200 can withstand the cryogenic temperatures of LNG, and external It is preferable that a heat insulating material is provided to block temperature effects.

이내 이고, 길이가 ℓ이내 이며, 높이가

이내인 상기 탱크쉘(120)의 내부에 구비되는 상기 LNG연료탱크(200)는 한 쌍이 2개조를 이루어져, 총 4개의 LNG연료탱크(200)가 선체(100)의 선저 중 선체중앙부에 배치되는 것이 바람직하다.And the width according to an embodiment of the present invention

Is within, the length is within ℓ, and the height is

The LNG fuel tank 200 provided inside the tank shell 120 is composed of two pairs, and a total of four LNG fuel tanks 200 are disposed at the center of the hull of the ship's bottom. It is preferred.

이고, 길이가

이며, 높이가

이다.(여기서, B는 선체의 폭이고, ℓ는 Mid-ship 구간 길이(parallel middle body)이며, D는 선체의 높이이다.)At this time, the LNG fuel tank 200 has a height in the vertical direction is smaller than the width in the left-right direction, and the length in the front-rear direction is greater than the height in the vertical direction and the width in the left-right direction to form a long, flat shape. end

And length

And height

(Where B is the width of the hull, ℓ is the mid-ship section middle (parallel middle body), D is the height of the hull.)

=17.58m 이내이고, 길이가

=98.7m 이내이며, 높이

=10.67m 이내로, 용적은 예정항로에 따라 20,000㎥ 이상이 되도록 한다.Here, the height, width, and length of the LNG fuel tank 200 according to an embodiment of the present invention are not limited to any one value. For example, a reference ship 20,000 TEU class large container ship (Length OA=399m, LBP=380.12) m, Breadth=58.6m, Depth=32m, ℓ=197.4m) corresponding to the height, width and length of the LNG fuel tank 200.

=17.58m or less, and the length

Less than =98.7m, height

It should be less than =10.67m, and the volume should be more than 20,000㎥ depending on the planned route.

In addition, the reason why the LNG fuel tank 200 is independent of four is to disperse a large load due to cargo loaded on the LNG fuel tank 200, the center of gravity of the vessel is lowered, and the vessel is floating on the water. When the force is inclined by the force from the outside in the state, or when the external force is removed in the inclined state, the resilience, which is a property to return to the original state, is improved.

Referring to FIG. 4, when comparing a conventional ship and a ship according to an embodiment of the present invention in which four LNG fuel tanks 200 are disposed in the hull center part of the bottom of the hull 100, FIG. ) Denotes the center of gravity of a conventional container ship, and FIG. 4(b) shows the center of gravity of a ship according to an embodiment of the present invention, as shown, the weight of a ship according to an embodiment of the present invention It can be seen that the center is lower than the conventional ship, and the recovery moment arm G 4Z₁ of the ship according to an embodiment of the present invention is longer than the recovery moment arm GZ of the conventional ship as shown in FIG. 4(c). Can confirm that.

Accordingly, as in one embodiment of the present invention, four LNG fuel tanks 200 having a height in the vertical direction smaller than the width in the left-right direction and a length in the front-rear direction larger than the height in the vertical direction and the width in the left-right direction are selected from among the bottoms of the hull 100. When placed in the center of the hull, it can be seen that the length of the restoration moment arm G₁Z₁ according to an embodiment of the present invention is longer than that of the conventional restoration moment arm GZ, thereby improving the lateral stability of the ship.

Here, G is the center of gravity of the conventional ship, G₁ is the center of gravity of the ship according to an embodiment of the present invention, B is the assistant referee, B₁ is the new assistant referee, M is the metacenter, and GZ is the restoration of the conventional ship Moment arm length, G₁Z₁ is the restoration moment arm length of the ship according to an embodiment of the present invention.

In addition, it is to increase the strength of the tank shell 120 to protect the LNG fuel tank 200.

As the LNG fuel tanks 200 are modularized, the LNG fuel tank 200 is easily attached and detached, thereby making it easy to repair and repair.

In addition, each of the LNG fuel tanks 200 is directly and in parallel connected to the fuel pipe through which the LNG fuel flows, so that it can selectively flow the LNG fuel to any one of the LNG fuel tanks 200, the plurality of LNG fuel tanks LNG fuel accommodated in the (200) is located in the center of the hull 110 of the ship's bottom, and may optionally serve as a ballast water as it flows to either side.

In addition, the LNG fuel tank 200 is arranged to be spaced at a height of at least 4m from the bottom plate of the hull 100 for the purpose of protecting from external physical impact, and at least 12.86m from the left and right side outer plates of the hull It is preferable to arrange them above and apart.

In addition, the arrangement structure of the LNG fuel tank of the container ship according to an embodiment of the present invention is an E/R (engine room) through the fuel gas supply system (FGSS) from the LNG fuel tank 200 as shown in FIGS. 1 and 5. Fuel supply pipe up to) is significantly shorter than other performance lines 1 to 4 (when formed vertically at the center of the hull in the fuel tank as shown in FIG. 5), as shown in Table 1 below. Can.

Performance Line 1 Performance Line 2 Performance Line 3 Performance Line 4 Ship according to an embodiment of the present invention LOA(m) 400 400 400 398 399 Bmld(m) 58.8 58.8 58.6 54 58.6 Dmld(m) 32.8 32.5 30.6 30 32 Scantling Draught 16 16 16 16 16 Type of Fuel HFO,MDO HFO, MGO HFO, MGO HFO,MDO LNG Bunkers(㎥) 15800 14850 10000 14000 22934 TEU Capacity 20146 21413 19870 17554 20416 Fuel tank location
(From stern (m)) 244.041 245.75 232.6 248.44 171.969~101.346 E/R (engine room) location
(From stern (m)) 80.45 82.2 67.76 83.6 65.5766 Pipe Line(m) 181.791 176.65 185.08 183.04 49.884

In general, the longer the fuel supply pipe, the more pressure loss occurs. To compensate for this pressure loss, a high pressure pump was added on the fuel supply pipe, but due to the arrangement structure of the LNG fuel tank in the container ship according to an embodiment of the present invention, As shown in [Table 1], the fuel supply pipe is reduced, so there is no need to provide additional parts.

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 therefrom. Therefore, the true technical protection scope of the present invention should be determined by the technical spirit of the appended claims.

100: hull
110: central hull
120: tank shell
200: LNG fuel tank

Claims (5)

Hull in which the container is shipped; And
LNG fuel is stored, the height in the vertical direction is smaller than the width in the left and right direction, the length of the front and rear direction LNG fuel tank in a form larger than the height in the vertical direction and the width in the left and right direction; Plurality is included,
The LNG fuel tank arrangement structure of the LNG fuel tank of the container ship accommodated in the tank shell formed in the center of the hull of the ship's bottom.
The method according to claim 1,
The tank shell
Width

Is within, the length is within ℓ, and the height is

The arrangement structure of LNG fuel tanks within a container ship.
(Here, B is the width of the hull, ℓ is the mid-ship section length (parallel middle body), D is the height of the hull.)
The method according to claim 2,
The LNG fuel tank
The arrangement of LNG fuel tanks in a container ship in which two pairs are arranged in the center of the hull of the ship's bottom.
The method according to claim 3,
The LNG fuel tank
Width

And length

And height

Structure of LNG fuel tank in a container ship.
(Where, B is the width of the hull, ℓ is the mid-ship section length (parallel middle body), D is the height of the hull.)
The method according to claim 1,
The LNG fuel tank
At least on the left and right outer shell

The arrangement structure of LNG fuel tanks in container ships spaced apart above.
(Here, B is the width of the hull, which is the length from the left side to the right side.)

Images