CN113135261A - Liquefied gas fuel ship - Google Patents

Abstract

The invention provides a liquefied gas fuel ship which does not deform the shape of a liquefied gas fuel tank and does not interfere with a loading and unloading device with a tank dome and an outfitting. The liquefied gas fuel ship is provided with: liquefied gas fuel tanks (9, 9 ') which are stored under the upper deck (6) of the hull and have tank domes (10, 10') provided at the top thereof and having a connection portion to be connected to external equipment, and which store gas in a liquefied state; and an outfitting (12) mounted on the tank dome (10, 10'). A well (29) is formed in the upper deck (6) so as to open upward and project in the ship bottom direction, and liquefied gas fuel tanks (9, 9 ') are disposed in a state in which the tank domes (10, 10 ') project into the well (29) so that the outfitting (12) mounted on the tank domes (10, 10 ') does not interfere with a loading and unloading device (CS) that moves on the upper deck (6).

Description

Liquefied gas fuel ship

Technical Field

The present invention relates to a liquefied gas fuel ship using liquefied gas such as Liquefied Natural Gas (LNG), Liquefied Petroleum Gas (LPG), or ammonia as fuel for a propulsion engine.

Background

To reduce CO of the ship₂For the purpose of discharging a fuel amount, liquefied gases are being propelled, which use liquefied gases such as Liquefied Natural Gas (LNG), Liquefied Petroleum Gas (LPG), and ammonia as fuels for propulsion enginesDevelopment of fuel ships.

Among liquefied gas fuel ships are liquefied gas fuel ships that include: one or more liquefied gas fuel tanks which are accommodated in the hull, have a tank dome provided at the top thereof with a connection part for connecting to an external device, and store gas in a liquefied state; and one or more outfitting articles (japanese: articles) mounted on the top of the box.

Since the tank dome is provided on the top of the liquefied gas fuel tank, a space required for the liquefied gas fuel tank in the vertical direction becomes large. Therefore, if the entire liquefied gas fuel tank including the tank dome is stored in the hull, the height (vertical dimension) of the hull must be increased accordingly. In order to suppress the height of the hull, it is necessary to project the tank dome on the deck, but in this case, the projecting tank dome and the outfitting above it may interfere with the ship, the loading and unloading device on the land, and the like.

Therefore, in the LNG-fueled ship using LNG as fuel described in japanese patent application laid-open No. 2018-528119 (patent document 1), a recess is provided in an upper portion of a shell (outer shell) of an LNG fuel tank, and a deep well pump (japanese: ディ - プウオルポンプ) which is one of outfitting is provided in the recess, thereby reducing a space required for the LNG fuel tank in a vertical direction.

Documents of the prior art

Patent document

Patent document 1: japanese Kohyo publication 2018-528119

Disclosure of Invention

Problems to be solved by the invention

However, in the case of the structure of the LNG-fueled ship described in patent document 1, an LNG-fueled tank having a special shape in which a recess is provided in the LNG-fueled tank itself is required. The LNG tank having such a special shape is difficult to manufacture, and the manufacturing cost of the LNG tank is higher than usual.

In the LNG fuel ship described in patent document 1, a secondary bulkhead (100), a drive motor (84), a valve (98), and the like as outfitting items are present in a closed space downward from an upper deck. Therefore, when the drive motor (84), the valve (98) and the like are maintained, the operator cannot easily enter the space.

The invention aims to obtain a liquefied gas fuel ship which does not deform the shape of a liquefied gas fuel tank and does not interfere with a loading and unloading device by a tank dome and an outfitting.

Another object of the present invention is to provide a liquefied gas fuel ship in which leakage of liquefied gas does not spread to the surroundings even if an accident of liquefied gas leakage occurs.

It is still another object of the present invention to provide a liquefied gas fuel ship which can prevent the spread of combustion to the surroundings even when a fire breaks out at the tank dome.

Means for solving the problems

The present invention is to improve a liquefied gas fuel ship, including: one or more liquefied gas fuel tanks which are accommodated under the upper deck of the hull, have tank domes provided at the top thereof with connection portions to be connected to external equipment, and store gas in a liquefied state; and more than one outfitting article which is arranged on the round top of the box.

In the present invention, one or more wells (wells) are formed in the upper deck so as to open upward and project toward the ship bottom, and the liquefied gas fuel tank is disposed in a state where the tank dome projects into the well so that one or more outfitting articles attached to the tank dome do not interfere with the loading/unloading device that moves on the upper deck. Thus, the height of the box dome and the outfitting can be suppressed by housing the box dome in the well. Therefore, the device does not interfere with the handling device. Even if an accident of leakage of liquefied gas occurs, the leaked liquefied gas stops in the well and does not diffuse to the surroundings. In addition, even when a fire breaks out at the dome of the tank, the radiant heat of the flame is blocked by the wall of the well, and the spread of the flame to the surroundings can be prevented.

The number, arrangement, number, and shape of the liquefied gas fuel tanks are arbitrary. For example, the one or more liquefied gas tanks may be two liquefied gas tanks arranged in parallel in the width direction of the hull. In this case, the one or more wells may be one well extending in the fore-and-aft direction and the width direction of the hull, and the tank domes of the two liquefied gas fuel tanks may protrude into the one well. Thus, the operator who descends into the well can move between the two liquefied gas fuel tanks without moving up and down.

The one or more wells may be two wells arranged in parallel in the width direction of the hull, and the tank domes of the two liquefied gas fuel tanks may protrude into one well. In this way, the two liquefied gas tanks need to be moved up and down in the well, but even if a liquefied gas leak accident occurs in one well, the liquefied gas does not spread to the other well.

In the case of making two wells, a portion of the upper deck extending between the two wells may be formed to the same height as the other portion of the upper deck. Alternatively, the upper deck may be formed to have a height lower than the other portions of the upper deck but higher than the bottom of the well. If the height is set to such a level, a mechanical member such as a pipe connecting the two liquefied gas tanks can be disposed in a portion lower than the upper deck.

The liquefied gas fuel tank may be disposed so that one or more outfitting items do not interfere with the loading and unloading device. For example, when the upper deck includes an edge member (a so-called "hatch coaming") that surrounds the periphery of the opening of the ship's hold for storing cargo, it is preferable that one or more outfitting items are located on the ship's hold side of the edge member (the one or more outfitting items do not protrude upward from the edge member).

The one or more outfitting items mounted on the trunk dome include various outfitting items. For example, the liquefied gas fuel tank needs a level meter for measuring the level of the liquefied gas in the liquefied gas fuel tank and a safety valve for adjusting the pressure in the liquefied gas fuel tank, and these outfitting articles may be attached to the tank dome.

One or more liquefied gas fuel tanks may be disposed at any position in the longitudinal direction in which the hull extends. For example, the engine may be disposed at a rear portion in the longitudinal direction where the propeller engine is disposed. The present invention may be arranged near the center in the longitudinal direction in which the hull extends. Since liquefied gas is lighter than solid bulk cargo such as iron ore and coal, disposing a liquefied gas fuel tank near the center of the hull increases the buoyancy of the center of the hull, and contributes to preventing and reducing "sinking" (sinking) of the hull center.

When the liquefied gas fuel tank is disposed in the vicinity of the center portion in the longitudinal direction in which the hull extends, it is preferable that the liquefied gas fuel storage station for supplying liquefied gas to one or more liquefied gas fuel tanks be disposed also in the vicinity of the center portion. Thus, the fuel supply ship that supplies liquefied gas serving as fuel to the liquefied gas fuel tank can easily lean alongside the center of the liquefied gas fuel ship, and the fuel supply ship and the liquefied gas fuel ship can be stably moored (i.e., docked) during fuel supply. In addition, even when a liquefied gas fuel supply facility on land is used, the liquefied gas fuel storage station can be appropriately connected to a transfer arm or a pipe on land.

Drawings

Fig. 1 is a configuration diagram of an LNG fuel ship according to an example of the present embodiment, where fig. 1 (a) is a left side view and fig. 1 (B) is a plan view.

FIG. 2A is an end view of a cut part along line II-II shown in FIG. 1, and FIG. 2B is a plan view of a well part.

Fig. 3 is a partially enlarged view showing a state where an outfitting is attached to the tank dome.

Fig. 4 is a diagram of an LNG tanker according to a second embodiment, in which fig. 4 (a) is an end view of a cut portion at a position corresponding to fig. 2(a), and fig. 4 (B) is a plan view of a well portion.

Fig. 5 is a diagram of an LNG tanker according to a third embodiment, in which fig. 5 (a) is an end view of a cut portion at a position corresponding to fig. 2(a), and fig. 5 (B) is a plan view of a well portion.

Description of reference numerals:

1 LNG fuel ship

2 hull of ship

3 bow

5 stern of ship

6 upper armor plate

7 cabin

8 fuel tank section

9. 9' LNG fuel tank

11. 11' LNG fuel storage station

12 fitting-out

13A-13F openings

14A-14F edge member (Hatch coaming)

15A-15F hatch cover

17A-17A ballast tank

17A '-17F' ballast tank

19. 19' ballast tank

21 bridge

23 double bottom

25 support part

27. 27' recess

29 wells.

Detailed Description

Hereinafter, embodiments of the liquefied gas fuel ship according to the present invention will be described in detail with reference to the drawings. In the present embodiment, an LNG fuel ship using LNG as fuel for a propulsion engine is taken as an example.

< first embodiment >

Fig. 1 is a structural diagram of an LNG fuel ship as an example of the liquefied gas fuel ship according to the present embodiment, in which fig. 1 (a) is a left side view, and fig. 1 (B) is a plan view (in fig. 1 (a), for convenience of explanation, a ballast tank described later is omitted).

The LNG carrier 1 of the present embodiment is a bulk cargo ship (also referred to as bulk carrier) for bulk ore. The LNG-fuelled ship 1 has a bow 3 at one end of the hull 2, a stern 5 at the other end, and an upper deck 6 on the hull 2. The LNG fuel carrier 1 is divided into a plurality of sections in the hull 2, and holds 7 (first to sixth holds 7A to 7F) for loading cargo are formed below the upper deck 6. In the present embodiment, two LNG tanks (liquefied gas tanks) 9 and 9' of the same type for storing LNG (liquefied gas) as fuel for a propulsion engine are provided in a section (tank section) 8 between the third and fourth tanks 7C and 7D, that is, in the vicinity of the center portion in the longitudinal direction in which the hull 2 extends.

The two LNG fuel tanks 9 and 9' are cylindrical tanks arranged in parallel in the width direction of the hull 2 and extending in the longitudinal direction in which the hull 2 extends. LNG from the LNG tanks 9 and 9' is supplied to the propulsion engine provided at the stern 5 via a pipe not shown. The two LNG fuel tanks 9 and 9 'are provided with tank domes 10 and 10' respectively having connection portions to be connected to external equipment at the top portions thereof. An outfitting 12 is mounted on the tank dome 10, 10'. For example, in the present embodiment, a level gauge LG for measuring the height of the liquid surface of the LNG in the LNG tank 9 or 9 'and a relief valve SV for adjusting the pressure in the LNG tank (see fig. 3) are attached to the tank domes 10 and 10'. LNG fuel storage stations (liquefied gas fuel storage stations) 11 and 11' for supplying LNG are provided in the two LNG tanks 9 and 9, respectively. LNG fuel storage stations 11, 11 ' are disposed on an upper deck above ballast tanks 19, 19 ', which ballast tanks 19, 19 ' are located at positions corresponding to zoning 8. The LNG refueling stations 11 and 11' are parts to which a refueling pipe is connected to a refueling ship for supplying LNG to the LNG refueling ship 1. LNG fuel storage stations 11, 11' may also be arranged below the upper deck.

The first to sixth hold 7A to 7F each include: openings 13A to 13F opened in the upper deck 6; edge members (hatch coamings) 14A to 14F surrounding the periphery of the openings 13A to 13F; and hatch covers 15A to 15F that slide in the width direction of the hull and close the opening portions 13A to 13F. Further, ballast tanks 17A to 17F, 17A 'to 17F' for receiving water ballast are provided around the first to sixth tanks 7A to 7F, respectively. Similarly, ballast tanks 19 and 19 'are provided around the section 8 where the LNG tanks 9 and 9' are disposed. A bridge 21 is provided at the stern 5.

FIG. 2A is an end view of a cut part along line II-II shown in FIG. 1, and FIG. 2B is a plan view of a well part. Fig. 3 is a partially enlarged view showing a state where an outfitting is attached to the tank dome. Fig. 3 illustrates the tank dome 10 and the fourth hold 7D which is a hold in the vicinity thereof as an example. In fig. 3, the loading/unloading device CS is shown in a simplified manner, but may include a crane provided on the upper deck 6 of the LNG-fueled ship 1 and an onshore loading/unloading device.

As shown in fig. 2(a), a double bottom 23 and an LNG tank support 25 are provided in the tank compartment 8, and ballast tanks 19 and 19' are provided around these portions. Recesses 27, 27 ' are formed in the upper portion of the LNG tank support portion 25, and the LNG tanks 9, 9 ' are fixed in a state of being accommodated in the recesses 27, 27 '. Further, a well 29 which opens upward and is convex toward the bottom of the ship is formed in the upper deck 6 of the tank compartment 8. The well 29 is formed in a shape extending in the fore-and-aft direction and the width direction of the hull. The LNG fuel tanks 9 and 9 ' are arranged in a state where bottoms thereof are accommodated in the recesses 27 and 27 ' and the tank domes 10 and 10 ' are projected into the well 29.

In the present embodiment, for example, the diameter dimension DR of the tank dome 10, 10' is set to 2500mm, the protrusion height dimension PH is set to 1420mm at maximum, the length dimension L of the well 29 is set to 5000mm, the width dimension W is set to 21400mm, and the depth dimension D is set to 2000 mm.

In the present embodiment, as is apparent from the above dimensions, the tank domes 10 and 10' do not protrude upward from the well 29. In the present embodiment, as shown in fig. 3, the outfitting 12 (the level gauge LG, the safety valve SV) partially protrudes from the well 29, but the outfitting 12 is disposed so as not to interfere with the loading and unloading device CS that moves on the upper deck 6. More specifically, the outfitting 12 (the level gauge LG, the safety valve SV) is disposed so as not to protrude upward from the hatch coaming 14 (at a position closer to the cabin side than the hatch coaming 14).

When loading cargo into the fourth hold 7D or loading and unloading cargo, the cargo handling device CS moves on the upper deck 6 at a height exceeding the hatch coaming 14 in a state where the hatch 15D is open (i.e., in a state where the cargo handling device CS does not interfere with the hatch 15D), and accesses the fourth hold 7D from the opening portion 13D. Thus, the loading and unloading device CS does not interfere with the outfitting 12 (the level gauge LG, the safety valve SV) and the tank dome 10.

< second embodiment >

Fig. 4 (a) and (B) are views of an LNG tanker according to a second embodiment, fig. 4 (a) is an end view of a cut portion at a position corresponding to fig. 2(a), and fig. 4 (B) is a plan view of a well portion. The same portions as those of the first embodiment are denoted by reference numerals in an amount of 100 added to the reference numerals denoted in fig. 2(a) and (B), and the description thereof is omitted.

In the second embodiment, the shape of the well is different from that of the first embodiment. In the second embodiment, the well includes two wells 129, 129' arranged in parallel in the width direction of the hull. In the present embodiment, for example, the width W, W 'of the two wells 129, 129' is set to 5000mm, and the length L, L 'of the two wells 129, 129' is set to 5000 mm. Other dimensions are the same as those of the first embodiment. The tank domes 110, 110 ' of the two LNG fuel tanks 109, 109 ' protrude into the wells 129, 129 ', respectively. In the present embodiment, a portion 106A of the upper deck 106 extending between the two wells 129, 129' is formed to the same height as the other portions of the upper deck 106.

< third embodiment >

Fig. 5 (a) and (B) are views of an LNG tanker according to a third embodiment, fig. 5 (a) is an end view of a cut portion at a position corresponding to fig. 2(a), and fig. 5 (B) is a plan view of a well portion. The same portions as those of the first embodiment are denoted by reference numerals obtained by adding 200 to the reference numerals denoted in fig. 2(a) and (B), and the description thereof is omitted.

In the third embodiment, the shape of the well is different from the first and second embodiments. In the third embodiment, the well includes two wells 229 and 229' arranged in parallel in the width direction of the hull. In the present embodiment, the dimensions are set to be the same as those in the second embodiment, for example. Tank domes 210, 210 ' of the two LNG tanks 209, 209 ' protrude into wells 229, 229 ', respectively. In the present embodiment, a portion 206A of the upper deck 206 extending between the two wells 229, 229 'is formed to be lower than other portions of the upper deck 206, but to be higher than the bottoms of the wells 229, 229'. In the present embodiment, for example, the height d of the portion 206A of the upper deck 206 from the bottom of the wells 229 and 229' is set to 1000 mm. It is suitable to provide a portion 206A of the upper deck 206 with pipes or the like connecting the two LNG tanks 209, 209'.

The above embodiments have been described as examples, but the present invention is not limited to the embodiments unless departing from the gist thereof. For example, although the LNG fuel carrier is taken as an example in the above embodiment, it is needless to say that the present invention can be applied to a liquefied gas fuel carrier that uses other liquefied gas such as LPG or ammonia as fuel. LNG, LPG, and ammonia are merely examples of liquefied gases, and are not limited thereto.

Industrial applicability of the invention

According to the present invention, it is possible to provide a liquefied gas fuel ship in which the tank dome and outfitting do not interfere with the loading and unloading device, without deforming the shape of the liquefied gas fuel tank. Further, it is possible to provide a liquefied gas fuel ship in which, even if a liquefied gas leakage accident occurs, the leaked liquefied gas does not spread to the surroundings. Further, it is possible to provide a liquefied gas fuel ship which can prevent the spread of combustion to the surroundings even when a fire breaks out at the tank dome.

Claims (10)

1. A liquefied gas fuel ship is provided with:

one or more liquefied gas fuel tanks which are accommodated under the upper deck of the hull, have tank domes provided at the top thereof with connection portions to be connected to external equipment, and store gas in a liquefied state; and

one or more outfitting items mounted on the tank dome,

the liquefied gas fuel vessel is characterized in that,

at least one well is formed on the upper deck to open upward and to be convex toward the ship bottom,

the liquefied gas fuel tank is disposed in a state where the tank dome protrudes into the well so that the one or more outfitting articles attached to the tank dome do not interfere with a loading/unloading device that moves on an upper deck.

2. The liquefied gas fuel vessel according to claim 1,

the one or more liquefied gas fuel tanks are two liquefied gas fuel tanks arranged in parallel in the width direction of the hull,

the one or more wells are one well extending in the fore-and-aft direction and the width direction of the hull,

the tank dome of each of the two liquefied gas fuel tanks protrudes into the one well.

3. The liquefied gas fuel vessel according to claim 1,

the one or more liquefied gas fuel tanks are two liquefied gas fuel tanks arranged in parallel in the width direction of the hull,

the one or more wells are two wells arranged in parallel in the width direction of the hull,

the tank domes of the two liquefied gas fuel tanks each project into one of the wells.

4. The liquefied gas fuel vessel according to claim 3,

a portion of the upper deck extending between the two wells is formed to the same height as other portions of the upper deck.

5. The liquefied gas fuel vessel according to claim 3,

a portion of the upper deck extending between the two wells is formed to a height lower than other portions of the upper deck but higher than a bottom of the wells.

6. The liquefied gas fuel vessel according to claim 1,

the upper deck is provided with an edge member which surrounds the periphery of an opening of a hold for storing cargo,

the one or more outfitting products are located closer to the cabin side than the edge member.

7. The liquefied gas fuel vessel according to claim 1,

the one or more outfitting items include a level meter that measures a height of a liquid surface of the liquefied gas in the liquefied gas fuel tank.

8. The liquefied gas fuel vessel according to claim 1,

the one or more outfitting items include a safety valve for adjusting the pressure in the liquefied gas fuel tank.

9. The liquefied gas fuel vessel according to claim 1,

the one or more liquefied gas fuel tanks are disposed near a central portion in a longitudinal direction in which the hull extends.

10. The liquefied gas fuel vessel according to claim 9,

a liquefied gas fuel storage station for supplying the liquefied gas to the one or more liquefied gas fuel tanks is provided near the central portion where the one or more liquefied gas fuel tanks are arranged.

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