JP2023087281A - floating structure - Google Patents

Abstract

To provide a floating structure that is equipped with a liquefied gas tank storing liquefied flammable gas and has high convenience.SOLUTION: A floating structure is equipped with a liquefied gas tank that has strength requiring no secondary barrier, a hold space that stores the liquefied gas tank, and an inner passage that is adjacent to the hold space and passably connects with an indoor non-hazardous area.SELECTED DRAWING: Figure 2

Description

The present disclosure relates to a floating structure with a liquefied gas tank.

A floating structure floating on water has a limited installation area for equipment and the like compared to a structure on the ground, and has a low degree of freedom in design. Furthermore, if this floating structure is provided with a liquefied gas tank that stores liquefied combustible gas, the degree of freedom in design is further reduced from the viewpoint of safety (see, for example, Patent Document 1 below). As a result, convenience for workers who work inside the floating structure is sacrificed.

JP 2016-120814 A

An object of the present disclosure is to provide a highly convenient floating structure that includes a liquefied gas tank that stores liquefied combustible gas.

A floating structure according to an aspect of the present disclosure includes a liquefied gas tank having a strength that does not require a secondary barrier, a hold space that houses the liquefied gas tank, and an indoor non-hazardous area adjacent to the hold space that is passable. a connecting internal passageway;

According to the above configuration, it is possible to provide a highly convenient floating structure that includes a liquefied gas tank that stores liquefied combustible gas.

FIG. 1 is a schematic side view of a floating structure. FIG. 2 is a schematic plan view of the floating structure. 3 is a cross-sectional view taken along line III-III in FIG. 2. FIG. 4 is a sectional view taken along line IV-IV in FIG. 2. FIG. 5 is a cross-sectional view taken along line V-V in FIG. 2. FIG.

A floating structure 100 according to an embodiment will be described below. 1 is a schematic side view of the floating structure 100, and FIG. 2 is a schematic plan view of the floating structure 100. FIG. A floating structure 100 according to the present embodiment is a liquefied gas carrier that carries liquefied gas. However, the floating structure 100 may be a floating production, storage and offloading facility (FPSO), a floating LNG storage and regasification facility (FSRU), a floating production and offloading facility (FPO), a floating storage and offloading facility (FSO), or the like. good too.

As shown in FIGS. 1 and 2, the floating structure 100 according to the present embodiment includes a hull 11, a liquefied gas tank 12, a hold space 13, a deck 14, an engine room 15, a stern accommodation area 16, Boatswain warehouse 17, internal passage 18, lower expansion room 19, inner expansion room 20, upper deck room 21, independent room 22, independent upper room 23, branching/integrating device 24, and opening/closing door 25 , a power receiving box 26 , a connection port 27 , an emergency stop button 28 , an electric motor 29 and a fuel cell 30 . These constituent elements will be described in order below.

<Hull>
The hull 11 is formed to be navigable. The concept of direction in the following description corresponds to the concept of direction when a passenger on the floating structure 100 navigates (to the right of the paper surface in FIGS. 1 and 2). Further, hereinafter, the longitudinal direction of the hull 11 is referred to as the "longitudinal direction", the left-right direction as the "width direction", the front end as the "bow", and the rear end as the "stern".

3 is a cross-sectional view taken along line III-III in FIG. 2. FIG. As shown in FIG. 3, the hull 11 includes a bottom 41 and sidewalls 42 . The side walls 42 extend upward from both ends in the width direction of the ship bottom 41, and the ship bottom 41 and the side walls 42 are integrally formed. The hull 11 of this embodiment has a double structure, and the inner peripheral surface and the outer peripheral surface are formed of different steel plates separated from each other. That is, the ship bottom 41 and the side walls 42 have a double structure, and the inner and outer peripheral surfaces are formed of different steel plates separated from each other. However, the hull 11 does not have to have a double structure. The hull 11 is entirely made of steel.

<Liquefied gas tank>
The liquefied gas tank 12 is a tank that stores liquefied gas. The liquefied gas tank 12 of this embodiment stores liquefied gas obtained by liquefying combustible gas. For example, the liquefied gas tank 12 stores liquefied hydrogen, liquefied natural gas (LNG), liquefied petroleum gas (LPG), and the like. A floating structure 100 according to this embodiment includes four liquefied gas tanks 12 . These liquefied gas tanks 12 are spherical or ellipsoidal and are aligned longitudinally. However, the number, shape, and arrangement of the liquefied gas tanks 12 are not limited to those described above.

Tanks for storing liquefied combustible gas are classified into three types according to strength. The first type is a tank that requires a secondary barrier surrounding the entire tank (complete secondary barrier). A "secondary barrier" as used herein is a wall for retaining liquefied gas leaking from a tank when the tank is damaged. The second type is a tank that is stronger than the first type but requires a partial secondary barrier (partial secondary barrier). The third type is an unnecessary tank that is stronger than the second type and is a secondary barrier. These first, second, and third types correspond to types A, B, and C defined by the International Maritime Organization (IMO), respectively. The liquefied gas tank 12 of this embodiment belongs to the third type among the three types described above. That is, the liquefied gas tank 12 of the present embodiment is a tank having strength that does not require a secondary barrier.

<Hold space>
The hold space 13 is a space that accommodates the liquefied gas tank 12 . As shown in FIG. 2 , the hold space 13 is located behind the boatswain's warehouse 17 and forward of the engine room 15 . Further, as shown in FIG. 3, the hold space 13 is located above the ship bottom 41 between the left and right side walls 42 . The hold space 13 of this embodiment accommodates the liquefied gas tank 12 with a gap therebetween. That is, the liquefied gas tank 12 is not in contact with the side wall 42, the bottom 41, the engine room 15, and the boatswain's warehouse 17 that define the hold space 13, but has gaps therebetween. The hold space 13 is partitioned by partition walls 50 located between the liquefied gas tanks 12, and the adjacent liquefied gas tanks 12 are not in contact with each other. The upper portion of each liquefied gas tank 12 is covered with a tank cover 40 with a gap therebetween.

Here, each area within the floating structure 100 is divided into a dangerous area and a non-hazardous area. Electrical equipment that is not explosion-proof cannot be installed in hazardous areas, but electrical equipment that is not explosion-proof can be installed in non-hazardous areas. As described above, the liquefied gas tank 12 of this embodiment has a strength that does not require a secondary barrier. Therefore, combustible gas is less likely to be generated in the hold space 13 that accommodates the liquefied gas tank 12 . Therefore, even if a certain area is adjacent to the hold space 13 via a steel plate or the like, that area can be regarded as a non-hazardous area.

<Deck>
The deck 14 is located on the hull 11 and exposed to the outside. The deck 14 is flat and surrounds the liquefied gas tank 12 together with the tank cover 40 . Note that the deck 14 is welded to the tank cover 40 . The deck 14 is not connected to the liquefied gas tank 12 and there is a gap between the deck 14 and the liquefied gas tank 12 . The deck 14 is also located above an internal passageway 18 and a deckswain's warehouse 17, which will be described later. In this embodiment, since the liquefied gas tank 12 has a strength that does not require a secondary barrier, combustible gas is unlikely to be generated in the hold space 13, and the deck 14 is regarded as a non-hazardous area. can be done.

<Engine room>
The engine room 15 is a room that houses the main engine. The engine room 15 is located in the stern part and is located below the deck 14 in the vertical direction. However, part of the engine room 15 may be located above the deck 14 . The front surface of the engine room 15 is made of steel plate, and the inside of the engine room 15 does not communicate with the hold space 13 . Although the engine room 15 is adjacent to the hold space 13, it does not have to be adjacent to the hold space 13. As described above, combustible gas is less likely to be generated in the hold space 13 of this embodiment, so even if the engine room 15 is adjacent to the hold space 13, the inside of the engine room 15 can be regarded as a non-hazardous area. . The main engine accommodated in the engine room 15 is an internal combustion engine that uses boil-off gas generated in the liquefied gas tank 12, heavy oil, or the like as fuel to drive the screw propeller 43. However, the main engine may use steam generated by burning boil-off gas to drive a steam turbine connected to the screw propeller 43 . Alternatively, the screw propeller 43 may be driven by a motor.

Further, in the present embodiment, a projecting portion 44 projects from the engine room 15 toward the interior of the hold space 13 . The projecting portion 44 of the present embodiment includes an electrical equipment room 51 and a ballast water treatment equipment room 52 . Of these, the electrical equipment room 51 is a room for housing electrical equipment, and is positioned above the center of the hold space 13 in the vertical direction. The ballast water treatment device room 52 is a room for accommodating a ballast water treatment device that purifies ballast water, and is positioned below the center of the hold space 13 in the vertical direction. Note that the projecting portion 44 may communicate with or be independent of the engine room 15 .

According to this configuration, the engine room 15 can be expanded by the amount of the projecting portion 44 , and an auxiliary machine room or the like that is connected to or independent from the engine room 15 can be added. An emergency fire pump used for extinguishing a fire when a fire breaks out in the engine room 15 may be arranged on the projecting portion 44 . Also, when the projecting portion 44 is independent from the engine room 15, that is, when the projecting portion 44 and the engine room 15 are separated by an airtight wall and are in different areas, even if a fire occurs in the engine room 15, An emergency fire pump used to extinguish a fire may be arranged on the projecting portion 44 . In this case, the projection 44 may be provided with an access passage extending from the deck 14 or interior non-hazardous area. Furthermore, as shown in FIG. 1, the projecting portion 44 is positioned below the center of the liquefied gas tank 12 so that at least a portion of the projecting portion 44 overlaps the liquefied gas tank 12 in plan view. Since the liquefied gas tank 12 of this embodiment has a spherical or ellipsoidal shape, the gap between the engine room 15 and the liquefied gas tank 12 is large below the center of the liquefied gas tank 12 . Since the protruding portion 44 is located at such a position, it is possible to effectively utilize the space that could become dead space. However, the position of the projecting portion 44 is not limited to the above.

Although the projecting portion 44 in this embodiment projects from the engine room 15 , it may project from a non-hazardous area other than the engine room 15 . For example, the projecting portion 44 may project toward the interior of the hold space 13 from the deckswain's warehouse 17 and the lower expansion chamber 19, which will be described later. Also, the number of protrusions 44 is not limited. By projecting the projecting portion 44 from the non-hazardous area in this way, the non-hazardous area is expanded, and as a result, the degree of freedom in design is improved.

<Aft accommodation area>
The stern accommodation area 16 is an area where workers live or work. The stern accommodation area 16 is located at the stern and above the engine room 15 . Further, the stern accommodation area 16 of this embodiment is located above the deck 14 and is not adjacent to the hold space 13 . As such, the aft accommodation 16 can be considered a non-hazardous area. The floating structure 100 may be provided with a bow accommodation area where workers live or work at the bow in addition to the stern accommodation area 16 or instead of the stern accommodation area 16 .

<Boardswain Warehouse>
The boatswain's warehouse 17 is a warehouse for storing ship equipment and the like. The boatswain's warehouse 17 is located at the bow and below the deck 14 . However, the boatswain's warehouse 17 may protrude above the deck 14 . The rear surface of the boatswain's warehouse 17 is made of a steel plate, and the inside of the boatswain's warehouse 17 does not communicate with the hold space 13 . The boatswain's warehouse 17 is adjacent to the hold space 13, but as described above, combustible gas is less likely to occur in the hold space 13 of this embodiment, so the inside of the boatswain's warehouse 17 should be regarded as a non-hazardous area. can be done.

<Internal Passage>
The internal passageway 18 is a passageway extending longitudinally within the floating structure 100 . The internal passageway 18 in this embodiment is located inside the side wall 42 . However, if the hull 11 does not have a double structure, the internal passage 18 may be arranged adjacent to the side wall 42 on the hold space 13 side of the side wall 42 . Also, the internal passageway 18 of this embodiment is located in the upper part of the side wall 42 and is adjacent to the deck 14 below the deck 14 . The internal passage 18 is surrounded by steel plates, and the interior of the internal passage 18 does not communicate with the hold space 13 . The internal passage 18 is adjacent to the hold space 13, but as described above, combustible gas is unlikely to be generated in the hold space 13 of the present embodiment, so the internal passage 18 can be regarded as a non-hazardous area. can. Therefore, it is possible to install non-explosion-proof electrical equipment in the internal passage 18, thereby improving the degree of freedom in design.

Further, the internal passage 18 is connected to the indoor engine room 15 at its rear end so as to be able to pass through, and is connected at its front end so as to be able to pass through to the indoor boatswain's warehouse 17 . Therefore, the worker can come and go between the engine room 15 and the deckswain's warehouse 17, that is, between the bow and the stern, through the internal passage 18 without going outside. In addition, since the internal passage 18 can be regarded as a non-hazardous area, even if the internal passage 18 is connected to the engine room 15 and the boatswain's warehouse 17, the engine room 15 and the boatswain's warehouse 17 are non-hazardous areas. can be maintained.

Also, the front end portion of the internal passage 18 may extend to the front end of the hull 11 , and the rear end portion of the internal passage 18 may extend to the rear end of the hull 11 . Furthermore, when the floating structure 100 is provided with a bow structure such as a bow accommodation space located at the bow and at least part of which is located below the deck 14, the front end portion of the internal passage 18 is located at the bow structure. It may be connected to a portion below the deck 14 of the . Similarly, if the floating structure 100 comprises an aft structure such as the aft accommodation 16 located at the stern and at least partially below the deck 14, the aft end portion of the internal passageway 18 is It may be connected to a part below the deck 14 of the stern structure.

Furthermore, between the internal passage 18 and the engine room 15 and the boatswain's warehouse 17, a watertight passage door 45 which does not allow entry of water is installed. Therefore, even if water intrudes into the internal passage 18 , the intruded water does not reach the engine room 15 and the boatswain's warehouse 17 . In addition, between the internal corridor 18 and the engine room 15 and the boatswain's warehouse 17, an airlock consisting of two airtight doors may be installed. In addition, the rear end of the internal passage 18 may be connected to the stern accommodation space 16 instead of the engine room 15 so as to be passable. Similarly, the forward end of the internal passageway 18 may be flowably connected to the aforementioned bow accommodation rather than the boatswain's storehouse 17 . Also, the internal passage 18 may be connected to only one of the engine room 15 and the boatswain's warehouse 17 so as to be able to pass through. In addition, although one internal passage 18 in the present embodiment is arranged on each of the left and right sides of the floating structure 100, the number and arrangement of the internal passages 18 are not limited.

<Lower expansion room>
The lower expansion chamber 19 is a chamber that communicates with the internal passage 18 on the lower side of the internal passage 18 . The lower expansion chamber 19 and the internal passage 18 may or may not be partitioned by a door. The lower expansion chamber 19 is located inside the side wall 42 . The lower expansion chamber 19 of this embodiment is in direct contact with the internal passage 18, but may be connected to the internal passage 18 via a vertically extending passage. The lower expansion chamber 19 is surrounded by steel plates, and the inside of the lower expansion chamber 19 does not communicate with the hold space 13 . Although the internal passage 18 is adjacent to the hold space 13, the lower expansion chamber 19 can also be regarded as a non-hazardous area because combustible gas is less likely to be generated in the hold space 13 of this embodiment as described above. can. Although the floating structure 100 according to this embodiment has one lower expansion chamber 19 , the floating structure 100 may have a plurality of lower expansion chambers 19 .

<Inside expansion room>
The inner expansion chamber 20 is a room that communicates with the internal passage 18 on the hold space 13 side of the internal passage 18 , that is, on the center side of the hull 11 . The inner expansion chamber 20 and the internal passage 18 may or may not be partitioned by a door. As shown in FIG. 2, the inner expansion chamber 20 is located near between the liquefied gas tanks 12 adjacent in the longitudinal direction. Further, the inner expansion chamber 20 has a trapezoidal shape with the side wall 42 side as the longer side in plan view. However, the position and shape of the inner expansion chamber 20 are not limited to those described above. Although the floating structure 100 according to this embodiment has one inner expansion chamber 20 , the floating structure 100 may have a plurality of inner expansion chambers 20 .

4 is a sectional view taken along line IV-IV in FIG. 2. FIG. As shown in FIG. 4, the inner expansion chamber 20 is adjacent to the deck 14 below the deck 14 . Also, the inner expansion chamber 20 is adjacent to the hold space 13 . The inner expansion chamber 20 is surrounded by steel plates, and the inside of the inner expansion chamber 20 does not communicate with the hold space 13. - 特許庁Although the inner expansion chamber 20 is adjacent to the hold space 13, the inside of the inner expansion chamber 20 is regarded as a non-hazardous area because combustible gas is less likely to be generated in the hold space 13 of the present embodiment as described above. be able to. By connecting the internal passage 18 and the inner expansion chamber 20 in this way, the non-dangerous area extending from the internal passage 18 can be widened in the width direction. Therefore, the area in which non-explosion-proof electrical equipment can be installed is expanded, and the degree of freedom in design is improved.

<Upper deck room>
The upper deck room 21 is a room located on the deck 14 and surrounded by steel plates. The upper deck chamber 21 is located above the internal passageway 18 and the inner expansion chamber 20 . Further, as shown in FIG. 2, the upper deck chamber 21 is positioned inside the outer edge of the inner expansion chamber 20 in plan view. Further, the upper deck chamber 21 of this embodiment communicates with the internal passage 18 and the inner expansion chamber 20 . However, the upper deck chamber 21 may communicate with one of the internal passage 18 and the inner expansion chamber 20, and does not communicate with either the internal passage 18 or the inner expansion chamber 20. may be independent of

Since the deck room 21 is located on the deck 14 which can be considered a non-hazardous area, the inside of the deck room 21 can also be considered a non-hazardous area. Therefore, it is possible to install non-explosion-proof electrical equipment in the upper deck chamber 21, which improves the degree of freedom in design. In addition, the upper deck chamber 21 of this embodiment is positioned between the adjacent liquefied gas tanks 12 . However, the upper deck chamber 21 may be positioned between the rearmost liquefied gas tank 12 and the stern, or between the forwardmost liquefied gas tank 12 and the bow.

<Independent room>
The independent room 22 is a room located within the hold space 13 . The independent room 22 of this embodiment does not communicate with non-hazardous areas such as the engine room 15 and is independent from the non-hazardous areas. 5 is a cross-sectional view taken along line VV in FIG. 2. FIG. As shown in FIG. 5 , the independent chamber 22 is adjacent to the deck 14 below the deck 14 . The independent chamber 22 is surrounded by a steel plate, and the inside of the independent chamber 22 is not communicated with the hold space 13. - 特許庁The independent chamber 22 is located within the hold space 13, but as described above, combustible gas is less likely to be generated within the hold space 13 of the present embodiment, so the interior of the independent chamber 22 can be regarded as a non-hazardous area. .

In addition, an emergency fire extinguishing pump that is used to extinguish a fire in the engine room 15 may be arranged inside the independent room 22 . In this case, the enclosure 22 may be provided with an access passage extending from the deck 14 or from a non-hazardous area. Also, although the independent room 22 of this embodiment is adjacent to the deck 14 , the independent room 22 may not be adjacent to the deck 14 . For example, it may be positioned below the center of the liquefied gas tank 12 so that at least a portion of the independent chamber 22 overlaps the liquefied gas tank 12 in plan view. Since the liquefied gas tank 12 of this embodiment has a spherical or ellipsoidal shape, the gap between the engine room 15 and the liquefied gas tank 12 is large below the center of the liquefied gas tank 12 . Therefore, when the independent chamber 22 is located at such a position, the space that can become dead space can be effectively used. Although the independent room 22 in this embodiment is separated from the engine room 15 , the independent room 22 may be adjacent to the engine room 15 .

<Independent upper room>
The independent upper chamber 23 is a room located above the independent chamber 22 . As shown in FIG. 2, the independent upper chamber 23 is located inside the outer edge of the independent chamber 22 in plan view. Furthermore, the independent upper chamber 23 of this embodiment communicates with the independent chamber 22 . However, the independent upper chamber 23 does not have to communicate with the independent chamber 22 . Also, the independent upper chamber 23 is surrounded by steel plates, and the inside of the independent upper chamber 23 does not communicate with the hold space 13 . Because the independent upper chamber 23 is located above the deck 14, the independent upper chamber 23 can be considered a non-hazardous area.

<Branch aggregate equipment>
The branching/aggregating device 24 is a non-explosion-proof device that branches or aggregates electrical wiring. The branching and aggregation equipment 24 includes distribution boards, starter boards, inverter boards, transformers, field units that receive a plurality of sensor signals, and the like. The branching/aggregating device 24 of this embodiment is located within the internal passageway 18 . As previously mentioned, the internal passageway 18 can be considered a non-hazardous area, so that non-explosion proof electrical equipment 24 can be installed. Note that the branching/aggregating device 24 may be positioned in the lower expansion chamber 19 instead of the internal passage 18 or may be positioned in the inner expansion chamber 20 .

Here, since the branching/aggregating device 24 is a non-explosion-proof electrical device, if the internal passage 18 is in a dangerous area, the branching/aggregating device 24 must be installed in the aft accommodation area 16 or the like. There is In this case, the distance from the branching/aggregating device 24 to the electrical devices installed at each location of the floating structure 100 becomes long, and the arrangement of the electrical wiring becomes complicated. On the other hand, if the branching/aggregating device 24 is arranged in the internal passage 18 or the like as in the present embodiment, the electric wiring connecting each electric device and the branching/aggregating device 24 can be shortened, and the arrangement of the electric wiring can be reduced. can be simplified. In particular, in this embodiment, the upper deck room 21 is located above the branching and consolidating device 24 . Therefore, when the electrical equipment is installed in the upper deck room 21, the distance from the branching/aggregating equipment to the electrical equipment is shortened, so that the layout of the electrical wiring can be simplified.

<Open/close door>
The opening/closing door 25 is located on the surface of the lower expansion chamber 19 opposite to the hold space 13 . 1 shows a state in which the opening/closing door 25 is open, and FIG. 3 shows a state in which the opening/closing door 25 is closed. The opening/closing door 25 is positioned above the waterline, which is the line of the water surface when the floating structure 100 is floating on water. The opening/closing door 25 is a watertight door that does not allow entry of water, and is formed so as to open by sliding upward inward. However, the format of the opening/closing door 25 is not limited.

Since the opening/closing door 25 is configured as described above, by opening the opening/closing door 25, the worker can go out from the lower expansion chamber 19 to the outside of the floating structure 100. It is possible to enter the lower expansion chamber 19 . Therefore, for example, an operator can pass through the internal passage 18 and the lower extension room 19 from the engine room 15 or the stern accommodation space 16 and exit through the opening/closing door 25 . As a result, workers can safely go outside through the internal passage 18 and the lower expansion chamber 19 without going over the deck 14 even in rainy weather or at night. An elevator may be provided between the lower expansion chamber 19 and the internal passage 18 .

<Incoming box>
The power receiving box 26 is a device for connecting power cables of external equipment. The power receiving box 26 is installed in the lower expansion room 19 . As described above, since the inside of the lower expansion room 19 can be regarded as a non-hazardous area, the receiving box 26, which is a non-explosion-proof electrical device, can be installed. Furthermore, since the opening/closing door 25 is positioned on the side opposite to the hold space 13 of the lower expansion chamber 19, the power receiving box 26 can be accessed from the outside by opening the opening/closing door 25. - 特許庁As a result, the power cable of the external equipment can be connected to the power receiving box 26 without lifting it to the deck 14, for example.

<Connection port>
The connection port 27 is a device for connecting fluid transfer equipment such as hoses and pipes of external equipment. External facility fluid transfer equipment includes fuel supply hoses, fresh water supply hoses, sewage discharge hoses, bilge discharge hoses, and the like. The connection port 27 is installed in the lower expansion chamber 19 . Therefore, the connection port 27 can be accessed from the outside by opening the opening/closing door 25 . As a result, the fluid transfer equipment of the external equipment can be connected to the connection port 27 without having to lift the fluid transfer equipment of the external equipment to the deck 14, for example.

<Emergency stop button>
The emergency stop button 28 is a push button switch for stopping the work done using the fluid transfer equipment of the external equipment. That is, when the operator presses the emergency stop button 28, the work performed using the fluid transfer equipment of the external equipment is stopped. An emergency stop button 28 is installed in the lower expansion chamber 19 . As described above, since the lower expansion chamber 19 is a non-hazardous area, the emergency stop button 28, which is a non-explosion-proof electrical device, can be installed in the lower expansion chamber 19. FIG. Since the emergency stop button 28 is located near the connection port 27 to which the fluid transfer equipment of the external equipment is connected, it will The worker can quickly stop the work.

<Electric motor>
The electric motor 29 is a motor for driving cargo equipment such as a cargo compressor that compresses so-called boil-off gas obtained by vaporizing the liquefied gas in the liquefied gas tank 12 or gas obtained by forcibly vaporizing the liquefied gas. The electric motor 29 is mechanically coupled with the cargo equipment. The electric motor 29 and cargo equipment are installed in the upper deck compartment 21 . As described above, the inside of the upper deck room 21 can be regarded as a non-hazardous area, so the electric motor 29, which is an electric device, can be installed in the upper deck room 21 . If the deck 14 is a dangerous area, it is necessary to raise the deck 21 to make it a non-dangerous area. Since it can be assumed that there is, raising the upper deck room 21 becomes unnecessary.

When arranging cargo equipment such as a cargo compressor, a cargo pump, and a cargo process unit (which shares gas fuel with the engine room 15) in the deck upper compartment 21 as in the present embodiment, the cargo equipment is arranged. A room (cargo equipment room) is a hazardous area. In that case, the room in which the deck space 21 is divided and the cargo equipment room is arranged can be a hazardous area, and the room in which the electric motor 29 is installed can be a non-hazardous area. In this case, the room in which the electric motor 29 is arranged and the cargo equipment room are separated by an airtight wall, and the electric motor 29 is installed in one area partitioned by the airtight wall, and the cargo equipment is installed in the other area. . At that time, the shaft of the electric motor 29 may pass through the airtight wall.

In this embodiment, since cargo equipment is installed in the upper deck room 21, the upper deck room 21 functions as a cargo equipment room. However, the cargo equipment room may be located in the stern (for example, above when viewed from the engine room 15). In other words, a cargo equipment room different from the upper deck room 21 may be provided in the stern, and the electric motor 29 and the cargo equipment may be installed in the cargo equipment room.

<Fuel cell>
The fuel cell 30 is a device that generates electricity using the liquefied gas stored in the liquefied gas tank 12 or the combustible gas (boil-off gas) that naturally evaporates. The fuel cell 30 of this embodiment supplies electric power to each device of the floating structure 100 . A motor may be driven by electric power generated by the fuel cell 30 to assist the main engine, or the screw propeller 43 may be rotationally driven instead of the main engine. The fuel cell 30 of this embodiment is installed in the independent chamber 22 . As described above, the isolated chamber 22 in which the fuel cell 30 is to be installed can be considered a non-hazardous area, so the fuel cell 30, which is an electrical device, can be installed. Additionally, the isolation chamber 22 is isolated from the non-hazardous area. Therefore, even if combustible gas is generated from the fuel cell 30, the generated combustible gas will not flow into the non-hazardous area. No non-explosion-proof electrical equipment other than the fuel cell 30 is installed in the independent chamber 22 or the independent upper chamber 23 .

Although the fuel cell 30 is installed in the independent chamber 22 in this embodiment, it may be installed in the independent upper chamber 23 . Also, the floating structure 100 may include a secondary battery such as a lithium ion battery instead of the fuel cell 30 . In this case as well, the secondary battery is installed in the independent room 22 or the independent upper room 23, and no non-explosion-proof electrical equipment other than the secondary battery is installed in the independent room 22 and the independent room 22. Furthermore, the floating structure 100 may have both the fuel cell 30 and the secondary battery. In this case, two independent chambers 22 may be provided, one of which may be equipped with the fuel cell 30 and the other with the secondary battery. Alternatively, the independent chamber 22 and the independent upper chamber 23 may be made independent of each other, and the fuel cell 30 may be installed in one of them and the secondary battery in the other. In addition, for example, the secondary battery may store electric power generated by surplus boil-off gas for when a large amount of electric power is required.

Further, the fuel cell 30 can generate power using the gas sent from the cargo equipment room and supply power to the switchboard in the engine room 15 . In this case, the fuel cell 30 is preferably located between the cargo equipment room and the engine room 15 . For example, when the upper deck chamber 21 functions as a cargo equipment room as in this embodiment, that is, when the cargo equipment room is located on the deck 14, the independent chamber 22 or the independent upper chamber 23 in which the fuel cell 30 is installed should be located behind the cargo equipment room and between adjacent liquefied gas tanks 12 or behind the rearmost liquefied gas tank 12 . On the other hand, when the cargo equipment room is located in the stern part, it is desirable to be located behind the rearmost liquefied gas tank 12 .

(summary)
As described above, the floating structure according to the present embodiment includes a liquefied gas tank having a strength that does not require a secondary barrier, a hold space for accommodating the liquefied gas tank, and an indoor non-dangerous area adjacent to the hold space. and a communicable internal passageway.

As described above, in the floating structure according to the present embodiment, the internal passage adjacent to the hold space is connected to the indoor non-hazardous area so that the worker can pass through the non-hazardous area without going outside. can be moved into the internal passage from the Therefore, the floating structure according to this embodiment is highly convenient.

Moreover, the floating structure according to the present embodiment further includes an engine room corresponding to the non-dangerous area in the stern portion, and the internal passage is connected to the engine room so as to be passable.

Therefore, according to the floating structure according to the present embodiment, the worker can move from the engine room into the internal passage without going outside.

In addition, the floating structure according to the present embodiment further includes a stern structure corresponding to the non-dangerous area in the stern portion, and the internal passage is connected to the stern structure so as to be passable.

Therefore, according to the floating structure according to this embodiment, the worker can move from the stern structure into the internal passage without going outside.

Further, in the floating structure according to the present embodiment, a portion of the stern structure is located below the deck, and the internal passage can pass through a portion of the stern structure below the deck. may be connected.

This arrangement allows an operator to easily move from the aft structure into the interior passageway.

In addition, the floating structure according to the present embodiment further includes a boatswain's warehouse or a bow structure corresponding to the non-dangerous area at the bow, and the internal passage is connected to the boatswain's warehouse or the bow structure in a passable manner. are doing.

Therefore, according to the floating structure according to this embodiment, the worker can move from the internal passage into the deckswain's warehouse or the bow structure without going outside.

Further, in the floating structure according to the present embodiment, a portion of the bow structure is positioned below the deck, and the internal passage can pass through a portion of the bow structure below the deck. may be connected.

This arrangement allows an operator to easily move from the bow structure into the interior passageway.

Moreover, in the floating structure according to the present embodiment, the internal passage is connected to the non-dangerous area through a watertight passage door so as to be passable.

Therefore, according to the floating structure according to the present embodiment, even if water intrudes into the internal passage, the intruded water will not reach the non-hazardous area such as the engine room.

In addition, the floating structure according to the present embodiment further includes non-explosion-proof branching and consolidating equipment for branching or consolidating electrical wiring in the internal passage.

In this way, if the non-explosion-proof branching/aggregating device is positioned in the internal passage, the electrical wiring connecting each electrical device and the branching/aggregating device can be shortened, and the arrangement of the electrical wiring can be simplified.

11 Hull 12 Liquefied gas tank 13 Hold space 14 Deck 15 Engine room 16 Aft accommodation area 17 Boatswain's warehouse 18 Internal passage 19 Lower expansion room 20 Inner expansion room 21 Upper deck room 22 Independent room 23 Independent upper room 24 Branching and aggregation equipment 25 Opening and closing Door 26 Power receiving box 27 Connection port 28 Emergency stop button 29 Electric motor 30 Fuel cell 40 Tank cover 41 Ship bottom 42 Side wall 43 Screw propeller 44 Protrusion 45 Passage door 100 Floating structure

Claims (8)

A liquefied gas tank with strength that does not require a secondary barrier,
a hold space for accommodating the liquefied gas tank;
an interior passage adjacent to said hold space and traversably connected to an indoor non-hazardous area. Further comprising an engine room corresponding to the non-dangerous area at the stern,
2. A floating structure according to claim 1, wherein said internal passageway is connected to said engine room. Further comprising a stern structure corresponding to the non-hazardous area in the stern,
3. A floating structure according to claim 1 or 2, wherein said internal passageway connects said stern structure in a flowable manner. A portion of the stern structure is located below the deck,
4. A floating structure according to claim 3, wherein said internal passage communicates with a portion of said aft structure below said deck. Further comprising a deckswain's warehouse or a bow structure corresponding to the non-hazardous area at the bow,
5. A floating structure as claimed in any one of the preceding claims, wherein the internal passageway is in communication with the boatswain's store or the bow structure. A portion of the bow structure is located below the deck,
6. A floating structure according to claim 5, wherein said internal passageway communicates with a portion of said bow structure below said deck. 7. A floating structure according to any one of the preceding claims, wherein said internal passageway communicates with said non-hazardous area via a watertight access door. 8. The floating structure according to any one of claims 1 to 7, further comprising non-explosion-proof branching and consolidating equipment for branching or consolidating electrical wiring in said internal passage.

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