JP2021113042A - Liquefied gas fuel vessel - Google Patents

Abstract

To provide a liquefied gas fuel vessel capable of preventing tank domes and equipment from interfering with a cargo gear without deforming a liquefied gas fuel tank.SOLUTION: A liquefied gas fuel vessel includes: liquefied gas fuel tanks 9, 9' for storing gas in liquefied state stored below an upper deck 6 of a hull, provided with tank domes 10, 10' including connection parts with external equipment on apexes; and equipment 12 attached onto tops of the tank domes 10, 10'. The upper deck 6 has a well 29 formed to be open upward as well as to project toward the vessel bottom direction, and the liquefied gas fuel tanks 9, 9' are arranged in a state having the tank domes 10, 10' projecting inside the well 29 so as to prevent the equipment 12 attached onto the tops of the tank domes 10, 10' from interfering with a cargo gear CS moving on the upper deck 6.SELECTED DRAWING: Figure 2

Description

The present invention relates to a liquefied gas fuel ship that uses liquefied gas such as liquefied natural gas (LNG), liquefied petroleum gas (LPG), and ammonia as fuel for a propulsion engine.

With the _{aim of reducing CO 2} emissions from ships, the development of liquefied gas fuel ships that use liquefied gas such as liquefied natural gas (LNG), liquefied petroleum gas (LPG), and ammonia as fuel for propulsion engines is underway.

The liquefied gas fuel ship has one or more liquefied gas fuel tanks that are housed inside the ship and have a tank dome at the top that has a connection with an external device to store the gas in a liquefied state. Some are equipped with one or more fixtures mounted on the tank dome.

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 increases. Therefore, if the entire liquefied gas fuel tank including the tank dome is to be housed in the hull, the height (vertical dimension) of the hull must be increased accordingly. In order to reduce the height of the hull, it is necessary to project the tank dome onto the deck, but in this case, the protruding tank dome and the fixtures on it will interfere with the ship and the cargo handling equipment on land. there is a possibility.

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 the upper part of the shell (outer shell) of the LNG fuel tank, and the fitting is provided in the recess. By installing one deep well pump, we are devising ways to reduce the space required in the vertical direction of the LNG fuel tank.

Special Table 2018-528119

However, in the case of the structure of the LNG fuel ship described in Patent Document 1, a specially shaped LNG fuel tank in which the LNG fuel tank itself is provided with a recess is required. This specially shaped LNG fuel tank is difficult to manufacture, and the manufacturing cost of the LNG fuel tank is higher than usual.

Further, in the LNG fuel ship described in Patent Document 1, a secondary barrier (100), a drive motor (84), a valve (98), and the like, which are accessories, are present in a closed space below the upper deck. There is. Therefore, there is a problem that an operator cannot easily enter the space during maintenance of the drive motor (84), the valve (98), and the like.

An object of the present invention is to obtain a liquefied gas fuel ship in which the tank dome and accessories do not interfere with the cargo handling device without deforming the shape of the liquefied gas fuel tank.

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

Still another object of the present invention is to obtain a liquefied gas fuel ship that prevents the spread of fire to the surroundings even if a fire breaks out on the tank dome.

The present invention includes one or more liquefied gas fuel tanks and tanks that are housed under the upper deck of the hull and are provided with a tank dome at the top that has a connection with an external device to store the gas in a liquefied state. Liquefied gas fuel vessels with one or more fixtures mounted on the dome will be targeted for improvement.

In the present invention, one or more wells are formed on the upper deck so as to open upward and become convex toward the bottom of the ship, and one or more fixtures mounted on the tank dome are on the upper deck. The liquefied gas fuel tank is placed in the well with the tank dome protruding so as not to interfere with the cargo handling device moving on the deck. Since the tank dome is housed in the well in this way, the height of the tank dome and the fixtures can be suppressed. Therefore, it does not interfere with the cargo handling device. Further, even if a liquefied gas leak accident occurs, the leaked liquefied gas stays in the well and does not diffuse to the surroundings. Further, even if a fire breaks out on the tank dome, the radiant heat of the flame is blocked by the wall of the well, and the fire can be prevented from spreading to the surroundings.

The number and arrangement of liquefied gas fuel tanks and the number and shape of 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 the hull. In this case, one or more wells may be one well extending in the front-rear direction and the width direction of the hull, and each tank dome of the two liquefied gas fuel tanks protrudes into one well. May be good. In this way, the worker who got down in the well can go back and forth between the two liquefied gas fuel tanks without going up and down.

Further, one or more wells may be two wells arranged side by side in the width direction of the hull, and the tank domes of the two liquefied gas fuel tanks may each project into one well. .. In this way, it is necessary to go up and down the wells to move back and forth between the two liquefied gas fuel tanks, but even if a liquefied gas leak accident occurs in one well, the other well will have liquefied gas. Does not spread.

When there are two wells, a part of the upper deck extending between the two wells may be formed at the same height as the other part 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 the height is set to such a height, equipment such as a pipe connecting the two liquefied gas fuel tanks can be arranged in a portion lower than the upper deck.

The liquefied gas fuel tank may be arranged so that one or more fixtures do not interfere with the cargo handling device. For example, if the upper deck is provided with a rim (so-called “hatch combing”) that surrounds the opening of the hold that holds the cargo, one or more fixtures will be on the hold side of the rim. It is preferably located (one or more fixtures do not protrude above the rim).

The one or more fixtures mounted on the tank dome include various ones. For example, a liquefied gas fuel tank requires a liquid level gauge for measuring the height of the liquid 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. It may be mounted on top.

One or more liquefied gas fuel tanks may be arranged at arbitrary positions in the length direction in which the hull extends. For example, it may be arranged at the rear part in the length direction in which the propulsion engine is arranged. Further, it may be arranged near the central portion in the length direction in which the hull extends. Since liquefied gas is lighter than solid bulk cargo such as iron ore and coal, placing a liquefied gas fuel tank near the center of the hull increases the buoyancy of the center of the hull and sinks the center of the hull. ) ”Is useful for prevention / mitigation.

When arranging the liquefied gas fuel tank near the center in the length direction in which the hull extends, it is preferable to arrange the liquefied gas bunker station for supplying liquefied gas to one or more liquefied gas fuel tanks also near the center. .. By doing so, it becomes easier for the fuel supply ship that supplies the liquefied gas as fuel to the liquefied gas fuel tank to be lined up side by side in the center of the liquefied gas fuel ship, and the fuel supply ship and the liquefied gas fuel during fuel supply. The ship can be stably docked and moored. Further, even when the liquefied gas fuel supply facility on land is used, the liquefied gas bunker station and the transfer arm and hose on land can be appropriately connected.

It is a structural view of an example of the LNG fuel ship of this embodiment, (A) is a left side view, and (B) is a plan view. (A) is an end view of the line II-II cut portion shown in FIG. 1, and (B) is a plan view of the well portion. It is a partially enlarged view which shows the state which attached the accessory to the tank dome. It is a figure of the LNG fuel ship of the 2nd Embodiment, (A) is the end view of the cut portion of the position corresponding to FIG. 2 (A), and (B) is the plan view of the well part. It is the figure of the LNG fuel ship of the 3rd Embodiment, (A) is the end view of the cut portion of the position corresponding to FIG. 2 (A), and (B) is the plan view of the well part.

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

<First Embodiment>
FIG. 1 is a structural view of an LNG fuel ship as an example of the liquefied gas fuel ship of the present embodiment, (A) is a left side view, and (B) is a plan view (note that (A) is described. For the sake of convenience, the illustration of the ballast tank described later is omitted).

The LNG fuel carrier 1 of the present embodiment is a bulk carrier (also referred to as a bulk carrier) that loads ore in bulk. The LNG fueled 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 inside of the hull 2 of the LNG fuel ship 1 is divided into a plurality of sections, and a hold 7 (first hold 7A to sixth hold 7F) for loading cargo is formed under the upper deck 6. In the present embodiment, LNG (fuel tank compartment) serving as fuel for the propulsion engine is located between the third hull 7C and the fourth hull 7D, that is, in the compartment (fuel tank compartment) 8 near the central portion in the length direction in which the hull 2 extends. It is equipped with two LNG fuel tanks (liquefied gas fuel tanks) 9, 9'of the same type that store liquefied gas).

The two LNG fuel tanks 9, 9'are arranged side by side in the width direction of the hull 2, and are columnar tanks extending in the length direction in which the hull 2 extends. LNG from the LNG fuel tanks 9, 9'is supplied to the propulsion engine provided at the stern 5 via a pipeline (not shown). Each of the two LNG fuel tanks 9, 9'is provided with tank dome 10, 10', which has a connection with an external device at the top. The fixture 12 is mounted on the tank dome 10 and 10'. For example, in the present embodiment, on the tank dome 10, 10', a liquid level gauge LG for measuring the height of the LNG liquid level in the LNG fuel tanks 9, 9', and a pressure adjustment in the LNG fuel tank. A safety valve SV is installed (see FIG. 3). LNG bunker stations (liquefied gas bunker stations) 11, 11'for supplying LNG are provided in each of the two LNG fuel tanks 9, 9'. The LNG bunker stations 11, 11'are located on the upper deck above the ballast tanks 19, 19', located at positions corresponding to compartment 8. The LNG bunker stations 11 and 11'are portions where the fuel supply vessel that supplies LNG to the LNG fuel vessel 1 connects the fuel supply pipe. The LNG bunker stations 11, 11'may be located below the upper deck.

Each of the first hold 7A to the sixth hold 7F has an opening 13A to 13F opened in the upper deck 6, a rim material (hatch combing) 14A to 14F surrounding the opening 13A to 13F, and a width direction of the hull. It is provided with hatch covers 15A to 15F that slide into and close the openings 13A to 13F. In addition, ballast tanks 17A to 17F and 17A'to 17F' for putting water ballast are provided around each of the first hold 7A to the sixth hold 7F. Similarly, ballast tanks 19, 19'are provided around the compartment 8 in which the LNG fuel tanks 9, 9'are arranged. A bridge 21 is provided at the stern 5.

FIG. 2A is an end view of the line II-II cut portion shown in FIG. 1, and FIG. 2B is a plan view of the well portion. Further, FIG. 3 is a partially enlarged view showing a state in which the fixture is attached to the tank dome. In FIG. 3, the tank dome 10 and the fourth hold 7D, which is a hold near the tank dome 10, are shown as an example. In FIG. 3, the cargo handling device CS is shown in a simplified manner, but includes a crane installed on the upper deck 6 of the LNG fuel ship 1 and a cargo handling device on land.

As shown in FIG. 2A, a double bottom 23 and an LNG fuel tank support portion 25 are provided in the fuel tank compartment 8, and ballast tanks 19 and 19'are provided around the double bottom 23 and an LNG fuel tank support portion 25. .. Recesses 27, 27 ′ are formed in the upper part of the LNG fuel tank support portion 25, and the LNG fuel tanks 9, 9 ′ are fixed in the recesses 27, 27 ′. .. Further, the upper deck 6 of the fuel tank compartment 8 is formed with wells 29 which are open upward and convex toward the bottom of the ship. The well 29 has a shape extending in the front-rear direction and the width direction of the hull. The LNG fuel tanks 9, 9'are arranged with the bottom portion housed in the recesses 27, 27'and the tank dome 10, 10' projecting into the well 29.

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

In the present embodiment, as is clear from the above dimensions, the tank dome 10, 10'does not protrude upward from the well 29. Then, in the present embodiment, as shown in FIG. 3, the fixture 12 (liquid level gauge LG, safety valve SV) partially protrudes from the well 29, but moves on the upper deck 6. It is arranged so as not to interfere with CS. More specifically, the fixture 12 (liquid level gauge LG, safety valve SV) is arranged so as not to protrude above the hatch combing 14 (so as to be located on the hold side of the hatch combing 14).

When loading or unloading cargo into the 4th 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 do not interfere with each other). , Move on the upper deck 6 at a height exceeding the hatch combing 14, and access the 4th hold 7D from the opening 13D. As a result, the cargo handling device CS does not interfere with the fixture 12 (liquid level gauge LG, safety valve SV) and the tank dome 10.

<Second embodiment>
4 (A) and 4 (B) are views of the LNG fuel ship of the second embodiment, FIG. 4 (A) is an end view of the cut portion at a position corresponding to FIG. 2 (A), and (B) Is a plan view of the well portion. Regarding the parts common to the first embodiment, reference numerals are given by adding 100 to the reference numerals given in FIGS. 2 (A) and 2 (B), and the description thereof will be 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 129,129'arranged side by side in the width direction of the hull. In the present embodiment, as an example, the width dimensions W and W'of the two wells 129 and 129'are set to 5,000 mm, and the length dimensions L and 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' project into the wells 129 and 129', respectively. In this embodiment, the portion 106A of the upper deck 106 extending between the two wells 129, 129'is formed at the same height as the other portion of the upper deck 106.

<Third embodiment>
5 (A) and 5 (B) are views of the LNG fuel ship of the third embodiment, and (A) is an end view of the cut portion at a position corresponding to FIG. 2 (A). Is a plan view of the well portion. The parts common to the first embodiment are designated by adding 200 to the reference numerals given in FIGS. 2A and 2B, and the description thereof will be omitted.

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

The above-described embodiment is described as an example, and the present invention is not limited to the present embodiment as long as it does not deviate from the gist thereof. For example, in the above embodiment, an LNG fueled ship is taken as an example, but it is needless to say that it can be applied to a liquefied gas fueled ship that uses another liquefied gas such as LPG or ammonia as fuel. It should be noted that LNG, LPG, and ammonia are merely examples of liquefied gas, and are not limited thereto.

According to the present invention, it is possible to provide a liquefied gas fuel ship in which the tank dome and the fixtures do not interfere with the cargo handling device without deforming the shape of the liquefied gas fuel tank. Further, even if a liquefied gas leak accident occurs, it is possible to provide a liquefied gas fuel ship in which the leaked liquefied gas does not diffuse to the surroundings. Further, it is possible to provide a liquefied gas fuel ship that prevents the spread of fire to the surroundings even if a fire breaks out on the tank dome.

1 LNG fuel ship 2 Hull 3 Hull 5 Stern 6 Upper deck 7 Hold 8 Fuel tank compartment 9, 9'LNG fuel tank 11, 11' LNG bunker station 12 Equipment 13A to 13F Opening 14A to 14F Edge material (hatch combing)
15A ~ 15F Hatch cover 17A ~ 17A Ballast tank 17A'~ 17F' Ballast tank 19, 19' Ballast tank 21 Funabashi 23 Double bottom 25 Support 27, 27'Recess 29 well

Claims (10)

One or more liquefied gas fuel tanks that are housed under the upper deck of the hull and have a tank dome at the top that has a connection to external equipment to store the gas in a liquefied state.
A liquefied gas fueled ship equipped with one or more fixtures mounted on the tank dome.
One or more wells are formed on the upper deck so as to open upward and become convex toward the bottom of the ship.
The liquefied gas fuel tank is arranged with the tank dome protruding into the well so that the one or more fixtures mounted on the tank dome do not interfere with the cargo handling device moving on the upper deck. A liquefied gas fuel ship characterized by being 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.
The liquefied gas fuel ship according to claim 1, wherein the tank dome of each of the two liquefied gas fuel tanks projects into the one well. 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.
The liquefied gas fuel ship according to claim 1, wherein the tank dome of each of the two liquefied gas fuel tanks projects into one of the wells. The liquefied gas fuel ship according to claim 3, wherein a part of the upper deck extending between the two wells is formed at the same height as the other part of the upper deck. The liquefied gas according to claim 3, wherein a part of the upper deck extending between the two wells is formed at a height lower than the other parts of the upper deck but higher than the bottom of the well. Fuel ship. On the upper deck, a rim material surrounding the opening of the hold for accommodating cargo is provided.
The liquefied gas fuel ship according to claim 1, wherein the one or more fixtures are located on the hold side of the edge material. The liquefied gas fuel ship according to claim 1, wherein the one or more accessories include a liquid level gauge for measuring the height of the liquid level of the liquefied gas in the liquefied gas fuel tank. The liquefied gas fuel ship according to claim 1, wherein the one or more accessories include a safety valve for adjusting the pressure in the liquefied gas fuel tank. The liquefied gas fuel ship according to claim 1, wherein the one or more liquefied gas fuel tanks are arranged near the central portion in the length direction in which the hull extends. 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 where the one or more liquefied gas fuel tanks are arranged. Liquefied gas fuel ship as described in.

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