KR20210093751A - Liquefied gas fuel ship - Google Patents

Abstract

Provided is a liquefied gas fuel ship which prevents tank domes and fittings from interfering with an unloading device without changing the shape of liquefied gas fuel tanks. The liquefied gas fuel ship comprises: liquefied gas fuel tanks (9, 9') which are accommodated under the upper deck (6) of a hull, have tank domes (10, 10') installed on upper portions thereof and having portions for connection with an external device, and store gas in a liquefied state; and fittings (12) attached to the top of the tank domes (10, 10'). The upper deck (6) has a well (29) formed to be opened upward and to be convex in the bottom direction of the ship. To prevent the fittings (12), attached to the top of the tank domes (10, 10'), from interfering with an unloading device (CS) moving on the upper deck (6), the liquefied gas fuel tanks (9, 9') are disposed with the tank domes (10, 10') protruding in the well (29).

Description

Liquefied gas fuel ship {LIQUEFIED GAS FUEL SHIP}

This invention relates to the liquefied gas fuel ship which uses liquefied gas, such as liquefied natural gas (LNG), liquefied petroleum gas (LPG), and ammonia, as a fuel of a propulsion engine.

There is a liquefied natural gas to a reduction of CO ₂ emission of the ship for the purpose (LNG), liquefied petroleum gas (LPG), liquefied gas to a liquefied gas such as ammonia as a fuel for propulsion engine fuel line development proceeds.

In the liquefied gas fuel ship, one or more liquefied gas fuel tanks for storing gas in a liquefied state, which are accommodated in the hull, and a tank dome having a connection part with an external device are installed at the top, and on the tank dome Some have one or more accessories attached.

Since the tank dome is provided at the top of the liquefied gas fuel tank, the space required in the vertical direction of the liquefied gas fuel tank becomes large. Therefore, if the entire liquefied gas fuel tank including the tank dome is to be accommodated in the ship body, the height (vertical dimension) of the ship body must be increased that much. In order to suppress the height of the hull, it is necessary to protrude the tank dome above the deck.

Therefore, the LNG fuel ship using LNG as fuel described in Japanese Patent Publication No. 2018-528119 (Patent Document 1) forms a recess in the upper part of the shell (outer shell) of the LNG fuel tank, and a deep well which is one of the equipment in the recess. By installing a pump, research is being conducted to reduce the space required in the vertical direction of the LNG fuel tank.

Japanese Patent Publication No. 2018-528119

However, in the case of the structure of the LNG fuel ship described in patent document 1, the LNG fuel tank of the special shape which provided the recessed part in LNG fuel tank itself is needed. The LNG fuel tank of this special shape has high manufacturing difficulty, and the manufacturing cost of an LNG fuel tank is higher than usual.

Moreover, in the LNG fuel ship described in patent document 1, the secondary barrier 100, the drive motor 84, the valve 98, etc. which are equipment exist in the enclosed space below from the upper deck. Therefore, there is a problem that the operator cannot easily enter the space during maintenance of the drive motor 84 and the valve 98 .

It is an object of the present invention to obtain a liquefied gas fuel ship in which the shape of the liquefied gas fuel tank is not deformed and the tank dome and the equipment do not interfere with the cargo handling device.

Another object of the present invention is to obtain a liquefied gas fuel line in which the leaked liquefied gas does not diffuse to the surroundings even if a leak accident of the liquefied gas occurs.

Another object of the present invention is to obtain a liquefied gas fuel line that prevents combustion to the surroundings even when a fire occurs on the tank dome.

The present invention is accommodated under the upper deck of the hull, and a tank dome having a connection part with an external device is installed at the top, and one or more liquefied gas fuel tanks for storing gas in a liquefied state, and one attached on the tank dome A liquefied gas fuel ship equipped with more than one equipment is an object of improvement.

In the present invention, one or more wells are formed on the upper deck to open upward and to be convex toward the bottom of the ship, and one or more equipment attached to the tank dome is moved on the upper deck. In order not to interfere, the liquefied gas fuel tank is arrange|positioned in the state in which the tank dome protruded in the well. As the tank dome is accommodated in the well in this way, the height of the tank dome and the equipment can be suppressed. Therefore, it does not interfere with the cargo handling apparatus. Moreover, even if a leak accident of the liquefied gas occurs, the leaked liquefied gas stays in the well and does not diffuse to the surroundings. In addition, even when a fire occurs on the tank dome, the radiant heat of the flame is blocked by the wall of the well to prevent combustion to the surroundings.

The number and arrangement of the liquefied gas fuel tanks and the number and shape of the wells are arbitrary. For example, one or more liquefied gas fuel tanks may be two liquefied gas fuel tanks arranged side by side in the width direction of ship body. In this case, one or more wells may be one well extending in the front-rear direction and the width direction of a ship body, and each tank dome of two liquefied gas fuel tanks may protrude in one well. In this way, the two liquefied gas fuel tanks can be moved back and forth without an operator who descended into the well going up and down.

In addition, two wells arranged side by side in the width direction of ship body may be sufficient as one or more wells, and the tank dome of two liquefied gas fuel tanks may protrude in one well, respectively. In this way, although it is necessary to go up and down the well in order to go back and forth between the two liquefied gas fuel tanks, even if a leak accident of liquefied gas occurs in one well, the liquefied gas does not diffuse into the other well.

In the case of two wells, a part of the upper deck extending between the two wells may be formed at the same height as the other parts of the upper deck. Alternatively, it may be formed at a height lower than the rest of the upper deck, but higher than the bottom of the well. If set to such a height, base materials, such as a pipe which connects two liquefied gas fuel tanks, can be arrange|positioned in the part lower than the upper deck.

The liquefied gas fuel tank should just be arranged so that one or more equipment does not interfere with the cargo handling device. For example, if a coaming (so-called "hatch coaming") surrounding the opening of a hold holding cargo is provided on the upper deck, one or more fittings are located on the hold side rather than the coaming (one It is preferable that the above equipment does not protrude upward from the coaming).

One or more pieces of equipment attached to the tank dome include various ones. For example, a liquefied gas fuel tank requires a level gauge for measuring the liquid level of the liquefied gas in the liquefied gas fuel tank, and a safety valve for regulating the pressure in the liquefied gas fuel tank, and these may be mounted on the tank dome.

The longitudinal direction in which the ship body extends WHEREIN: One or more liquefied gas fuel tanks may be arrange|positioned at arbitrary positions. For example, it may be arrange|positioned at the rear part of the longitudinal direction in which a propulsion engine is arrange|positioned. Moreover, you may arrange|position near the center part of the longitudinal direction in which a ship body extends. Since liquefied gas is lighter than solid bulk cargo such as iron ore or coal, by arranging a liquefied gas fuel tank near the center of the hull, the buoyancy of the central part of the hull increases, and "sagging" in which the center of the hull sinks is prevented. · Helps in mitigation.

When the liquefied gas fuel tank is arranged near the central portion in the longitudinal direction in which the hull extends, it is preferable that a liquefied gas bunker station for supplying liquefied gas to one or more liquefied gas fuel tanks is also arranged in the vicinity of the central portion. In this way, the fuel supply line that supplies the liquefied gas serving as the fuel to the liquefied gas fuel tank is easily placed side by side in the central part of the liquefied gas fuel line, and the fuel supply line and the liquefied gas fuel line can be stably docked and moored during fuel supply. can Moreover, even when using the liquefied gas fuel supply facility on land, the liquefied gas bunker station and the transfer arm and hose on land can be connected suitably.

BRIEF DESCRIPTION OF THE DRAWINGS It is a structural diagram of the LNG fuel ship of an example of this embodiment, (A) is a left side view, (B) is a top view.
Fig. 2 (A) is an end view of the line II-II cut portion shown in Fig. 1, (B) is a plan view of the well portion.
3 is a partially enlarged view showing a state in which equipment is attached to the tank dome.
It is a figure of the LNG fuel ship of 2nd Embodiment, (A) is a cut part end view of the position corresponding to FIG.2(A), (B) is a top view of a well part.
5 : is a figure of the LNG fuel ship of 3rd Embodiment, (A) is a cut end view of the position corresponding to FIG. 2(A), (B) is a top view of a well part.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of the liquefied gas fuel ship of this invention is described in detail with reference to drawings. In this embodiment, the LNG fuel ship which uses LNG as a fuel of a propulsion engine is taken as an example.

<First embodiment>

BRIEF DESCRIPTION OF THE DRAWINGS It is a structural diagram of the LNG fuel ship of an example of the liquefied gas fuel ship of this embodiment, (A) is a left side view, (B) is a top view (In addition, in (A), illustration of a ballast tank mentioned later for convenience of description is shown. omitted).

The LNG fuel ship 1 of this embodiment is a bulk carrier (it is also called a bulk carrier) which stacks an ore. The LNG fuel ship 1 has a bow 3 at one end of a hull 2, a stern 5 at the other end, and has an upper deck 6 on the hull 2 . In the LNG fuel ship 1, the inside of the hull 2 is divided into a plurality of compartments, and the hold 7 (the first hold 7A to the sixth hold 7F) for loading cargo under the upper deck 6 is provided. is formed In this embodiment, the fuel of the propulsion engine is stored between the third hold 7C and the fourth hold 7D, that is, in the section (fuel tank section) 8 near the central portion in the longitudinal direction where the hull 2 extends. Two LNG fuel tanks (liquefied gas fuel tanks) 9 and 9' of the same type for storing LNG (liquefied gas) used are provided.

The two LNG fuel tanks 9 and 9' are arranged side by side in the width direction of the hull 2, and are cylindrical tanks extending in the longitudinal direction in which the hull 2 extends. LNG from the LNG fuel tanks 9 and 9' is supplied to the propulsion engine provided in the stern 5 through a pipeline (not shown). Each of the two LNG fuel tanks 9 and 9' is provided with a tank dome 10, 10' provided with a connection part with an external device at the top. The equipment 12 is attached on the tank domes 10 and 10'. For example, in the present embodiment, on the tank domes 10 and 10', a level gauge LG for measuring the level of the liquid level of the LNG in the LNG fuel tanks 9 and 9', and a safety for adjusting the pressure in the LNG fuel tank A valve SV is attached (see Fig. 3). Each of the two LNG fuel tanks 9 and 9' is provided with LNG bunker stations (liquefied gas bunker stations) 11 and 11' for supplying LNG. The LNG bunker stations 11 , 11 ′ are arranged on the upper deck above the ballast tanks 19 , 19 ′ at positions corresponding to the compartment 8 . The LNG bunker stations 11 and 11' are parts to which the fuel supply ship that supplies the LNG to the LNG fuel ship 1 connects the fuel supply pipe. The LNG bunker stations 11 and 11' may be arranged below the upper deck.

Each of the first holds 7A to 6F holds an opening 13A to 13F opened to the upper deck 6, and a coaming (hatch coaming) 14A to surrounding the openings 13A to 13F. 14F) and hatch covers 15A to 15F which slide in the width direction of the ship body and close the openings 13A to 13F. Moreover, the ballast tanks 17A-17F and 17A'-17F' for putting water ballast are provided around each of the 1st hold 7A - the 6th hold 7F. Similarly, ballast tanks 19 and 19' are also provided around the compartment 8 in which the LNG fuel tanks 9 and 9' are arranged. A bridge 21 is installed in the stern 5 .

Fig. 2(A) is an end view of the II-II cut portion shown in Fig. 1, and (B) is a plan view of the well. 3 is a partially enlarged view showing a state in which the equipment is attached to the tank dome. In Fig. 3, the tank dome 10 and the fourth hold 7D which is a hold in the vicinity thereof are shown as an example. Although the cargo handling apparatus CS is simplified and shown in FIG. 3, the crane installed on the upper deck 6 of the LNG fuel ship 1, and an onshore cargo handling apparatus are also included.

As shown in Fig. 2(A), in the fuel tank compartment 8, a double bottom 23 and an LNG fuel tank support part 25 are provided, and ballast tanks 19 and 19' are provided around it. has been Concave portions 27 and 27' are formed in the upper portion of the LNG fuel tank support 25, and the LNG fuel tanks 9 and 9' are fixed in a state accommodated in the recesses 27 and 27'. . Moreover, the well 29 which opened toward the upper deck 6 of the fuel tank division 8 and became convex toward the ship-bottom direction is formed. The well 29 has a shape extending in the front-rear direction and the width direction of the hull. The LNG fuel tanks 9 and 9' are arranged in a state in which the bottom part is accommodated in the recesses 27 and 27' and the tank domes 10 and 10' protrude in the well 29.

In this embodiment, as an example, the diameter dimension DR of the tank domes 10 and 10' is 2,500 mm, the protrusion height dimension PH is maximum 1,420 mm, the length dimension L of the well 29 is 5,000 mm, and the width The dimension (W) is set to 21,400 mm, and the depth dimension (D) is set to 2,000 mm.

In this embodiment, the tank domes 10 and 10' do not protrude upward from the well 29 as is evident from the above dimensions. In this embodiment, as shown in Fig. 3, the equipment 12 (level gauge LG, safety valve SV) partially protrudes from the well 29, but the cargo handling device moves on the upper deck 6 It is arranged so as not to interfere with (CS). More specifically, the equipment 12 (level gauge LG, safety valve SV) is arranged so as not to protrude upward from the hatch coaming 14 (to be located on the hold side of the hatch coaming 14).

When loading or unloading cargo into the fourth hold 7D, the cargo handling device CS has the hatch cover 15D open (that is, the cargo handling device CS and the hatch cover 15D) interfere with each other. not), move over the upper deck 6 at a height exceeding the hatch coaming 14 and access the fourth hold 7D from the opening 13D. Thereby, the cargo handling apparatus CS does not interfere with the equipment 12 (level gauge LG, safety valve SV), and the tank dome 10. As shown in FIG.

<Second embodiment>

4(A) and 4(B) are views of the LNG fuel ship of the second embodiment, (A) is a cut end view of a position corresponding to FIG. 2(A), (B) is a plan view of a well part. About the part common to 1st Embodiment, the code|symbol which added 100 to the code|symbol attached to Fig.2 (A) and (B) is attached|subjected, and the description is abbreviate|omitted.

In the second embodiment, the shape of the well is different from that in the first embodiment. In the second embodiment, the well is composed of two wells 129 and 129' arranged side by side in the width direction of the hull. In this embodiment, as an example, the width dimensions (W, W') of the two wells 129 and 129' are set to 5,000 mm, and the length dimensions (L, L') are set to 5,000 mm. Other dimensions are the same as in the first embodiment. The tank domes 110 and 110' of the two LNG fuel tanks 109 and 109' protrude in the wells 129 and 129', respectively. In this embodiment, a part 106A of the upper deck 106 extending between the two wells 129 and 129' is formed at the same height as the other parts of the upper deck 106. As shown in FIG.

<Third embodiment>

5(A) and (B) are views of the LNG fuel ship of the third embodiment, (A) is a cut end view of a position corresponding to FIG. 2(A), (B) is a plan view of a well part. About the part common to 1st Embodiment, the code|symbol which added 200 to the code|symbol attached to Fig.2 (A) and (B) is attached|subjected, and the description is abbreviate|omitted.

In the third embodiment, the shape of the well is different from that of the first and second embodiments. In the third embodiment, the well is composed of two wells 229 and 229' arranged side by side in the width direction of the hull. In the present embodiment, as an example, the same dimensions as in the second embodiment are set. Tank domes 210 and 210' of the two LNG fuel tanks 209 and 209' protrude in wells 229 and 229', respectively. In this embodiment, a portion 206A of the upper deck 206 extending between the two wells 229 and 229' is lower than the other portions of the upper deck 206, but is formed at a height higher than the bottom of the wells 229 and 229'. . In this embodiment, as an example, the height d of the part 206A of the upper deck 206 from the bottom of the wells 229 and 229' is set to 1,000 mm. A part 206A of the upper deck 206 is suitable for installing a pipe connecting the two LNG fuel tanks 209 and 209'.

The said embodiment is described as an example, and unless it deviates from the summary, this invention is not limited to this Example. For example, although the LNG fuel ship was taken as an example in the said embodiment, it goes without saying that it is applicable to the liquefied gas fuel ship which uses other liquefied gas, such as LPG and ammonia, as a fuel. In addition, LNG, LPG, and ammonia are only examples of liquefied gas, and are not limited to these.

ADVANTAGE OF THE INVENTION According to this invention, the liquefied gas fuel ship in which a tank dome and a fitting do not interfere with a cargo handling apparatus can be provided, without deforming the shape of a liquefied gas fuel tank. Moreover, even if a leak accident of liquefied gas arises, the liquefied gas fuel line in which the leaked liquefied gas does not diffuse to surroundings can be provided. Moreover, even when a fire occurs on the tank dome, it is possible to provide a liquefied gas fuel line that prevents combustion to the surroundings.

1 LNG fuel vessel
2 hull
3 players
5 stern
6 upper deck
7 dock
8 fuel tank compartment
9,9' LNG fuel tank
11,11' LNG Bunker Station
12 Equipment
13A-13F opening
14A to 14F coaming (hatch coaming)
15A~15F Hatch Cover
17A-17A ballast tank
17A'~17F' ballast tank
19,19' ballast tank
21 mission
23 double floor
25 support
27,27' recess
29 well

Claims (10)

One or more liquefied gas fuel tanks stored under the upper deck of the hull, and a tank dome having a connection part with an external device is installed at the top, and storing gas in a liquefied state;
A liquefied gas fuel ship having one or more equipment attached to the tank dome,
One or more wells are formed in the upper deck so as to open upward and to be convex toward the bottom of the ship,
The liquefied gas fuel tank is disposed in the well with the tank dome protruding so that the one or more equipment attached to the tank dome does not interfere with a cargo handling device moving on the upper deck. fuel line. The method of claim 1,
The one or more liquefied gas fuel tanks are two liquefied gas fuel tanks arranged side by side in the width direction of the hull,
The one or more wells are one well extending in the front-rear direction and the width direction of the hull,
Each of the tank domes of the two liquefied gas fuel tanks protrude in the one well. The method of claim 1,
The one or more liquefied gas fuel tanks are two liquefied gas fuel tanks arranged side by side in the width direction of the hull,
The one or more wells are two wells arranged side by side in the width direction of the hull,
A liquefied gas fuel line in which the tank domes of the two liquefied gas fuel tanks each protrude in one of the wells. 4. The method of claim 3,
A portion of the upper deck extending between the two wells is formed to be flush with the other portion of the upper deck. 4. The method of claim 3,
A portion of the upper deck extending between the two wells is lower than another portion of the upper deck, but is formed at a height higher than the bottom of the well. The method of claim 1,
A coaming is provided on the upper deck to surround the perimeter of the opening of the hold for accommodating the cargo,
The at least one equipment is a liquefied gas fuel vessel located on the hold side of the coaming. The method of claim 1,
The at least one equipment includes a level gauge for measuring the level of the liquid level of the liquefied gas in the liquefied gas fuel tank. The method of claim 1,
The at least one equipment includes a safety valve for regulating the pressure in the liquefied gas fuel tank. The method of claim 1,
The said one or more liquefied gas fuel tanks are arrange|positioned near the central part of the longitudinal direction in which the said hull extends. 10. The method of claim 9,
A liquefied gas bunker station for supplying the liquefied gas to the one or more liquefied gas fuel tanks is provided in the vicinity of the central portion in which the one or more liquefied gas fuel tanks are arranged.

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