Liquefied gas transport ship
By separating the cargo electrical control room from the engine room and living quarters on liquefied gas carriers, and by adopting A-60 class partition protection and redundancy systems, the problem of secondary disasters in the event of an engine room fire on liquefied gas carriers has been solved, the length of power supply cables and manufacturing costs have been reduced, and safety and reliability have been improved.
Patent Information
- Application Number
- CN202480045788.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2023-08-04
- Filing Date
- 2024-07-02
- Publication Date
- 2026-02-13
AI Technical Summary
A fire in the engine room of a liquefied gas carrier could lead to a secondary disaster, and the increased length of power cables would raise manufacturing costs.
The cargo switchboard room is separate from the engine room and living quarters, located in the stern area, and protected by A-60 class partitions. It is equipped with a redundant cargo switchboard system and external access access to improve security and reduce costs.
It effectively prevents secondary disasters caused by cabin fires, shortens the length of power supply cables, reduces manufacturing costs, and ensures the normal operation of cargo equipment in emergency situations.
Smart Images
Figure CN121532326A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present disclosure relates to a liquefied gas carrier. BACKGROUND
[0002] A ship having a collective starter panel that supplies electric power received from a main switchboard to a pump, a motor, and the like is disclosed in Patent Literature 1. The collective starter panel of Patent Literature 1 is disposed on each deck provided in an engine room.
[0003] PRIOR ART DOCUMENTS
[0004] PATENT LITERATURE
[0005] Patent Literature 1: Japanese Utility Model Registration No. 3146264 SUMMARY
[0006] PROBLEMS TO BE SOLVED BY THE INVENTION
[0007] Here, a liquefied gas carrier that transports liquefied gas as a cargo has a cargo switchboard that supplies electric power received from a main switchboard to a cargo device. If the collective starter panel of Patent Literature 1 is disposed in an engine room in which countermeasures against fire are sufficiently implemented, there is no problem even if the above-described cargo switchboard is disposed in the engine room. However, a fire can occur in the engine room due to an unexpected event. If the cargo switchboard can be used even if a fire occurs in the engine room, a secondary disaster can be prevented, and safety is improved. In addition, the position of the cargo switchboard affects the length of a power supply cable that connects the main switchboard and the cargo device. If the power supply cable becomes long due to the position of the cargo switchboard, the manufacturing cost of the liquefied gas carrier increases.
[0008] Therefore, an object of the present disclosure is to provide a liquefied gas carrier in which safety is improved and the manufacturing cost can be suppressed.
[0009] MEANS FOR SOLVING THE PROBLEMS
[0010] A liquefied gas carrier of one embodiment of the present disclosure has an engine room located in a stern region of a rear portion of a hull, a residential area located in a bow region of a front portion of the hull, a cargo device located in a cargo region of a central portion of the hull, a main switchboard located in the stern region, a cargo switchboard that distributes electric power received from the main switchboard to the cargo device, and a cargo switchboard room that houses the cargo switchboard independently of the engine room and the residential area.
[0011] EFFECT OF THE INVENTION
[0012] According to this structure, a liquefied gas carrier in which safety is improved and the manufacturing cost can be suppressed can be provided. BRIEF DESCRIPTION OF DRAWINGS
[0013] Figure 1 is a side view of a liquefied gas carrier.
[0014] Figure 2 is an enlarged view of the vicinity of the stern area of the liquefied gas carrier.
[0015] Figure 3 is a block diagram of an electrical system of the liquefied gas carrier. DETAILED DESCRIPTION
[0016] Hereinafter, an embodiment will be described. The liquefied gas carrier 100 of the present embodiment is a ship that carries liquefied gas such as liquefied hydrogen or liquefied natural gas. Figure 1 is a side view of the liquefied gas carrier 100 of the present embodiment. In Figure 1 , the right side on the paper is the direction in which the liquefied gas carrier 100 travels. Hereinafter, the direction in which the liquefied gas carrier 100 travels will be defined as the "front direction", and the direction opposite to the front direction will be defined as the "rear direction".
[0017] As shown in Figure 1 , the liquefied gas carrier 100 has a machinery room 10, a residential area 20, a cargo plant 30, a main switchboard 40, a cargo switchboard 50, a cargo switchboard room 60, and an external access passage 70. Hereinafter, these constituent elements will be described in order.
[0018] <Machinery Room>
[0019] The machinery room 10 is a room that houses a main engine 11. The main engine 11 of the present embodiment combusts the boil-off gas generated in the cargo tank 95 described later or the gas generated by a vaporizer, and drives a steam turbine coupled to a propeller 12 using steam generated by the heat of the combustion. However, the main engine 11 can also be an internal combustion engine that drives the propeller 12 using the boil-off gas generated in the cargo tank 95 or the like as fuel, or an electric motor that drives the propeller 12 using the electric power emitted by a generator that uses the boil-off gas generated in the cargo tank 95 or the like as fuel. In addition, the main engine 11 can use fuel oil mounted on the liquefied gas carrier 100 as fuel without using the boil-off gas or the like as fuel.
[0020] The machinery room 10 is located in the stern area 91 of the rear portion of the hull 90. The stern area 91 is an area that is more rearward than the cargo area 93. Figure 2 is an enlarged view of the vicinity of the stern area 91 of the liquefied gas carrier 100. As shown in Figure 2 , the machinery room 10 includes a machinery room lower portion 13 located at a position lower than the exposed deck 94 of the hull 90, and a machinery room upper portion 14 located at a position higher than the exposed deck 94. The machinery room upper portion 14 is connected to the rear portion of the machinery room lower portion 13, and the internal space of the machinery room upper portion 14 is connected to the internal space of the machinery room lower portion 13.
[0021] <Residential Area>
[0022] The residential area 20 is an area in which crew members live or conduct business. As shown in FIG. 1, the residential area 20 of the present embodiment is located in the bow area 92 of the front portion of the hull 90. The bow area 92 is an area that is located further forward than the cargo area 93. The interior of the residential area 20 is designated as a non-hazardous area. The "non-hazardous area" refers to an area in which there is no explosive atmosphere in the form of a gas that must be taken into consideration to a particular extent in the construction, arrangement, and use of electrical equipment. Figure 1
[0023] <Cargo Equipment>
[0024] The cargo equipment 30 is equipment that handles liquefied gas as cargo. The structure of the cargo equipment 30 is not limited, but the cargo equipment 30 of the present embodiment is located in the cargo area 93 of the central portion of the hull 90. The cargo area 93 is an area in which liquefied gas as cargo is stored. The cargo tanks 95 that store liquefied gas are located in the cargo area 93 of the present embodiment. The cargo tanks 95 of the present embodiment have the 1st tank 95A, the 2nd tank 95B, the 3rd tank 95C, and the 4th tank 95D arranged in order from the front.
[0025] Figure 3 is a block diagram of the electrical system of the liquefied gas carrier 100. The cargo equipment 30 of the present embodiment includes the 1st cargo equipment 31 and the 2nd cargo equipment 32. Furthermore, the 1st cargo equipment 31 includes four 1st cargo pumps 33A to 33D and two sprayer pumps 35A and 35C. In addition, the 2nd cargo equipment 32 includes four 2nd cargo pumps 34A to 34D and two sprayer pumps 35B and 35D. However, the constituent equipment of the 1st cargo equipment 31 and the 2nd cargo equipment 32 is not limited to the above structure, and for example, the 1st cargo equipment 31 and the 2nd cargo equipment 32 can each include only one constituent equipment.
[0026] The 1st cargo pumps 33A to 33D and the 2nd cargo pumps 34A to 34D are pumps that unload liquefied gas from the respective tanks 95A to 95D. The 1st tank 1st cargo pump 33A and the 1st tank 2nd cargo pump 34A are located in the 1st tank 95A, the 2nd tank 1st cargo pump 33B and the 2nd tank 2nd cargo pump 34B are located in the 2nd tank 95B, the 3rd tank 1st cargo pump 33C and the 3rd tank 2nd cargo pump 34C are located in the 3rd tank 95C, and the 4th tank 1st cargo pump 33D and the 4th tank 2nd cargo pump 34D are located in the 4th tank 95D. That is, the 1st cargo pumps 33A to 33D and the 2nd cargo pumps 34A to 34D that function in the same way are located in the respective tanks 95A to 95D.
[0027] The sprayers 35A to 35D are pumps for spraying liquefied gas into the tanks 95A to 95D to cool the tanks 95A to 95D, and the like. The cargo equipment 30 includes four sprayers 35A to 35D, which are located in the respective tanks 95A to 95D. In the present embodiment, the first tank sprayer 35A located in the first tank 95A and the third tank sprayer 35C located in the third tank 95C of the four sprayers 35A to 35D are included in the first cargo equipment 31, and the second tank sprayer 35B located in the remaining second tank 95B and the fourth tank sprayer 35D located in the fourth tank 95D are included in the second cargo equipment 32.
[0028] <Main distribution board>
[0029] The main distribution board 40 is a device that supplies electric power generated by the generator 96 to the respective equipment. As shown in FIG. 1, the main distribution board 40 of the present embodiment supplies electric power received from the generator 96 to the cargo equipment 30 via the cargo distribution board 50. In addition, as shown in FIG. 2, in the present embodiment, the generator 96 and the main distribution board 40 are located in the stern area 91. More specifically, the generator 96 and the main distribution board 40 are located in the engine room 10. In this way, the main distribution board 40 is located in the vicinity of the generator 96, and thus it is possible to shorten the power supply cable that connects the main distribution board 40 and the generator 96. In addition, the main distribution board 40 can be connected to a plurality of generators 96. Figure 3 Figure 2
[0030] <Cargo distribution board>
[0031] The cargo distribution board 50 is a device that supplies electric power received from the main distribution board 40 to the cargo equipment 30. Therefore, the cargo distribution board 50 is located on the power supply cable 97 that connects the main distribution board 40 and the cargo equipment 30. The cargo distribution board 50 can also function as a starter panel in which starters of the respective cargo equipment 30 are collected. As shown in FIG. 1, the cargo distribution board 50 includes a first cargo distribution board 51 and a second cargo distribution board 52. The first cargo distribution board 51 supplies electric power received from the main distribution board 40 to the first cargo equipment 31. In addition, the second cargo distribution board 52 supplies electric power received from the main distribution board 40 to the second cargo equipment 32. Figure 3
[0032] <Cargo distribution board room>
[0033] The cargo distribution board room 60 is a room that houses the cargo distribution board 50. As shown in FIG. 1, the cargo distribution board room 60 is independent of the engine room 10 and the residential area 20. That is, the cargo distribution board room 60 is separated from the engine room 10 and the residential area 20 by a partition such as a wall. Figure 1
[0034] Because the cargo distribution panel room 60 is independent of the engine room 10, even if a fire occurs in the engine room 10 due to unforeseen circumstances, the cargo distribution panel 50 within the cargo distribution panel room 60 can be protected and used. Therefore, the unloading of liquefied gas from the cargo tank 95 can continue via the cargo equipment 30, excessive pressure rise in the cargo tank 95 can be prevented, and secondary disasters caused by a fire in the engine room 10 can be prevented. Thus, safety is improved.
[0035] Alternatively, a cargo distribution panel 60 can be installed in the living quarters 20, separate from the engine room 10. However, if the cargo distribution panel 60 is installed in the living quarters 20 located in the bow area 92, the power supply cable 97 connecting the main distribution panel 40 to the cargo equipment 30 becomes longer. On the other hand, as in this embodiment, by installing the cargo distribution panel 60 separately from the living quarters 20, the length of the power supply cable 97 connecting the main distribution panel 40 to the cargo equipment 30 can be prevented. As a result, the manufacturing cost of the liquefied gas carrier 100 can be reduced.
[0036] In addition, such as Figure 2 As shown, the cargo distribution panel 60 of this embodiment is located in the stern region 91. Therefore, the distance from the main distribution panel 40 to the cargo distribution panel 60 and the distance from the cargo distribution panel 60 to the cargo equipment 30 are shortened. As a result, the power supply cable 97 connecting the main distribution panel 40 and the cargo equipment 30 can be shortened. Figure 3 This will further reduce the manufacturing cost of the liquefied gas carrier 100.
[0037] Furthermore, in this embodiment, the cargo switchboard room 60 is located above the freeboard deck. Here, "freeboard deck" refers to the uppermost continuous deck. A continuous deck is a deck that runs from bow to stern. In this embodiment, the exposed deck 94 is equivalent to the freeboard deck. Because the cargo switchboard room 60 is located above the freeboard deck as in this embodiment, even if the engine room 10 is flooded, the cargo switchboard 50 will not be submerged. Therefore, if power is supplied from an emergency generator located above the freeboard deck, or by connecting additional electrical wires to the cargo switchboard 50, the operation of the cargo equipment 30 can be maintained.
[0038] Furthermore, in this embodiment, the cargo electrical control room 60 is located above the lower part of the cabin 13 and is spaced apart from the lower part of the cabin 13 in the vertical direction. The space between the cargo electrical control room 60 and the lower part of the cabin 13 can be a simple space or a room surrounded by walls. Because the cargo electrical control room 60 is located at a distance from the lower part of the cabin 13 in the vertical direction, the possibility of the cargo electrical control panel 50 inside the cargo electrical control room 60 being protected in the event of a fire or flooding in the lower part of the cabin 13 is further increased, thus further enhancing safety.
[0039] In addition, the side surface of the cargo switchboard room 60 is in contact with the cabin 10 (cabin upper portion 14). Also, as shown in Figure 2 the cargo switchboard room 60 includes an A-60 class partition 63 at the side surface in contact with the cabin 10. Here, the "A-60 class partition" refers to a partition defined in SOLAS (International Convention for the Safety of Life at Sea). Specifically, the A-60 class partition is a partition in which heat-proof processing is performed using a non-combustible material, so that the average temperature of the side not exposed to fire does not rise more than 140 degrees Celsius compared to the initial temperature within 60 minutes from the occurrence of a fire, and the temperature of any point including joints does not rise more than 180 degrees Celsius compared to the initial temperature.
[0040] Thus, since the cargo switchboard room 60 of the present embodiment includes the A-60 class partition 63 at the side surface in contact with the cabin 10, even if a fire occurs in the cabin 10, the cargo switchboard 50 in the cargo switchboard room 60 can be protected from the fire for a certain period of time, and the cargo equipment 30 can be operated if power is supplied from the emergency generator or the like during this period. In addition, in the case where the bottom surface of the cargo switchboard room 60 is in contact with the cabin 10, the cargo switchboard room 60 can include an A-60 class partition at the bottom surface, and in the case where the top surface of the cargo switchboard room 60 is in contact with the cabin 10, the cargo switchboard room 60 can include an A-60 class partition at the top surface.
[0041] In addition, as shown in Figure 3 the cargo switchboard room 60 includes a first cargo switchboard room 61 and a second cargo switchboard room 62. The first cargo switchboard room 61 houses the first cargo switchboard 51, and the second cargo switchboard room 62 houses the second cargo switchboard 52. Further, the second cargo switchboard room 62 is independent of the first cargo switchboard room 61. Therefore, even if the first cargo switchboard room 61 is damaged and the first cargo equipment 31 cannot be operated by the first cargo switchboard 51, the second cargo equipment 32 can be operated by the second cargo switchboard 52 housed in the second cargo switchboard room 62. That is, according to the present embodiment, the reliability of the liquefied gas carrier 100 can be improved by redundancy.
[0042] <External Access Passage>
[0043] The external access passage 70 is a passage connecting the ship body exposure portion 98 and the cargo switchboard room 60. The external access passage 70 can be a step or a slope. Here, the "ship body exposure portion" refers to a portion of the ship body 90 that is open to the atmosphere. Since the liquefied gas carrier 100 has the external access passage 70 as described above, in an emergency, for example, an operator can evacuate from the cargo switchboard room 60 to the ship body exposure portion 98 without passing through the engine room 10, and also can move from the ship body exposure portion 98 toward the cargo switchboard room 60. Therefore, the safety of the liquefied gas carrier 100 can be improved.
[0044] (SUMMARY)
[0045] A first aspect disclosed in the present specification is a liquefied gas carrier having: an engine room located at a stern area of a ship body rear portion; a residential area located at a bow area of a ship body front portion; a cargo equipment located at a cargo area of a ship body central portion; a main switchboard located at the stern area; a cargo switchboard that distributes electric power received from the main switchboard to the cargo equipment; and a cargo switchboard room that houses the cargo switchboard, independently of the engine room and the residential area.
[0046] According to this structure, even if a fire occurs in the engine room due to an unexpected event, the cargo switchboard can be protected, and secondary disasters caused by the fire of the engine room can be prevented. In addition, the power supply cable connecting the switchboard and the cargo equipment can be inhibited from being lengthened. Thus, the safety is improved, and the manufacturing cost of the liquefied gas carrier can be inhibited.
[0047] A second aspect disclosed in the present specification is the liquefied gas carrier according to the first aspect, wherein the cargo switchboard room is located at the stern area.
[0048] According to this structure, the power supply cable connecting the switchboard and the cargo equipment can be shortened, and the manufacturing cost of the liquefied gas carrier can be further inhibited.
[0049] A third aspect disclosed in the present specification is the liquefied gas carrier according to the first or second aspect, wherein the cargo switchboard room is located at a position higher than the freeboard deck.
[0050] According to this structure, even if the engine room is flooded, the cargo switchboard is not submerged in water, and the operation of the cargo equipment can be maintained.
[0051] A fourth aspect disclosed in the present specification is the liquefied gas carrier according to any one of the first to third aspects, wherein the engine room includes an engine room lower portion located at a position lower than the exposure deck, and the cargo switchboard room is located at a position higher than the engine room lower portion and spaced apart from the engine room lower portion in the vertical direction.
[0052] According to this structure, even if a fire or flooding occurs in the lower portion of the engine room, the cargo distribution panel room is not easily affected by them.
[0053] Item 5 of the present specification is a liquefied gas carrier according to any one of Items 1 to 4, wherein at least a portion of the cargo distribution panel room is continuous with the engine room, and the cargo distribution panel room includes an A-60 rated partition in the portion continuous with the engine room.
[0054] According to this structure, even if a fire occurs in the engine room, the cargo distribution panel in the cargo distribution panel room can be protected from the fire for a certain period of time, and the cargo equipment can be operated during this period.
[0055] Item 6 of the present specification is a liquefied gas carrier, wherein the cargo equipment includes first cargo equipment and second cargo equipment, the cargo distribution panel includes a first cargo distribution panel that supplies power received from the main distribution panel to the first cargo equipment and a second cargo distribution panel that supplies power received from the main distribution panel to the second cargo equipment, and the cargo distribution panel room includes a first cargo distribution panel room that houses the first cargo distribution panel and a second cargo distribution panel room that houses the second cargo distribution panel independently of the first cargo distribution panel room.
[0056] According to this structure, the reliability of the liquefied gas carrier can be improved by redundancy.
[0057] Item 7 of the present specification is a liquefied gas carrier according to any one of Items 1 to 6, wherein the liquefied gas carrier further has an external access passage that connects a hull exposure portion, which is exposed to the atmosphere, with the cargo distribution panel room.
[0058] According to this structure, the safety of the liquefied gas carrier can be improved.
[0059] Reference Signs
[0060] 10: engine room; 11: main engine; 13: lower portion of engine room; 14: upper portion of engine room; 20: accommodation area; 30: cargo equipment; 31: first cargo equipment; 32: second cargo equipment; 33: first cargo pump; 34: second cargo pump; 35: sprinkler pump; 40: main distribution panel; 50: cargo distribution panel; 51: first cargo distribution panel; 52: second cargo distribution panel; 60: cargo distribution panel room; 61: first cargo distribution panel room; 62: second cargo distribution panel room; 63: A-60 rated partition; 70: external access passage; 90: hull; 91: stern area; 92: bow area; 93: cargo area; 94: exposed deck; 97: power supply cable; 98: hull exposure portion; 100: liquefied gas carrier.
Claims
1. A liquefied gas transport vessel, comprising: The engine room is located in the stern area at the rear of the hull. The living quarters are located in the bow area at the front of the hull. Cargo equipment, located in the cargo area in the central part of the hull; The main switchboard is located in the stern area; A cargo distribution panel that distributes power received from the main distribution panel to the cargo equipment; and The cargo distribution panel room, which houses the cargo distribution panel, is separate from the engine room and the living quarters.
2. The liquefied gas carrier according to claim 1, wherein, The cargo distribution panel room is located in the stern area.
3. The liquefied gas transport vessel according to claim 1, wherein, The cargo distribution panel is located above the freeboard deck.
4. The liquefied gas carrier according to claim 1, wherein, The engine room includes a lower engine room located below the exposed deck. The cargo electrical control room is located above the lower part of the cabin and is separated from the lower part of the cabin by a vertical distance.
5. The liquefied gas carrier according to claim 1, wherein, At least a portion of the cargo electrical control room is connected to the engine room. The cargo electrical control room includes an A-60 class partition located in the portion connected to the engine room.
6. The liquefied gas carrier according to claim 1, wherein, The cargo equipment includes a first cargo equipment and a second cargo equipment. The cargo distribution panel includes: A first cargo distribution panel, which supplies power received from the main distribution panel to the first cargo equipment; and The second cargo distribution panel supplies power received from the main distribution panel to the second cargo equipment. The cargo distribution panel room includes: A first cargo distribution panel compartment, which houses the first cargo distribution panel; and The second cargo distribution panel room is separate from the first cargo distribution panel room and houses the second cargo distribution panel.
7. The liquefied gas carrier according to claim 1, wherein, The liquefied gas carrier also has an external access route that connects the exposed hull section open to the atmosphere to the cargo electrical control room.