Ship with liquefied gas tank

Abstract

A ship according to one embodiment of the present disclosure is provided with: a liquefied gas tank for storing liquefied gas; an exhaust mast that exhausts combustible gas generated by gasification of the liquefied gas in the liquefied gas tank; the lifeboat is located outside the house; the refuge exit is connected with the outside; the refuge area is used for connecting the lifeboat with the refuge exit; and a shielding device which separates the exhaust port of the exhaust mast from the lifeboat and the refuge area.

Description

Technical Field

[0001] The present disclosure relates to a vessel having a liquefied gas tank. Background Art

[0002] Large ships have lifeboats for escaping from the hull of the ship when a fire or other marine disaster occurs. In this regard, ships with liquefied gas tanks are also the same (for example, refer to Patent Document 1 below).

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2018-62313 Summary of the invention

[0006] Problems to be solved by the invention

[0007] However, if a fire related to liquefied gas develops, the scale of the fire may become larger in a ship with a liquefied gas tank than in other ships. Therefore, an object of the present disclosure is to provide a ship with a liquefied gas tank that enables crew members to safely reach a lifeboat in the event of a fire.

[0008] Means for solving problems

[0009] A ship of one embodiment of the present invention comprises: a liquefied gas tank that stores liquefied gas; an exhaust mast that discharges flammable gas generated by the gasification of liquefied gas in the liquefied gas tank; a lifeboat that is located outside a house; an escape exit that is connected to the outside of the house; a refuge area that connects the lifeboat to the escape exit; and a shielding device that separates the exhaust outlet of the exhaust mast from the lifeboat and the refuge area.

[0010] Effects of the Invention

[0011] According to this structure, in the event of a fire, the crew can safely reach the lifeboat. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a side view of the ship according to the first embodiment.

[0013] Figure 2 It is a top view of the ship according to the first embodiment.

[0014] Figure 3 It is a side view of the ship of the second embodiment.

[0015] Figure 4 It is a top view of the ship of the second embodiment.

[0016] Figure 5 It is a side view of the ship of the third embodiment.

[0017] Figure 6 It is a top view of the ship of the third embodiment. DETAILED DESCRIPTION

[0018] (First embodiment)

[0019] First, a ship 100 according to a first embodiment will be described. Figure 1 It is a side view of the ship 100 according to the first embodiment. Figure 1 The right direction on the paper is the front of the ship 100, hereinafter referred to as "front". Figure 1 The left direction on the paper is the rear of the ship 100, which is hereinafter referred to as the "rear". In addition, the front and rear direction of the ship 100 is simply referred to as the "front and rear direction". Figure 2 It is a top view of the ship 100 according to the first embodiment. Figure 2 The up-down direction on the paper is the width direction of the ship 100, which is hereinafter referred to as the "ship width direction".

[0020] The ship 100 of the first embodiment is a liquefied gas tanker that transports liquefied gas. Figure 1 As shown, the ship 100 includes a cargo area 10, an exhaust mast 20, a non-cargo area 30, a building 40, a lifeboat 50, an evacuation exit 60, an evacuation area 70, and a shielding facility 80. These components will be described below in order.

[0021] The cargo area 10 is an area for storing liquefied gas. Examples of liquefied gas include liquefied hydrogen, liquefied natural gas (LNG), liquefied petroleum gas (LPG), etc. The cargo area 10 of this embodiment is located in the center of the front-rear direction of the ship 100. In the cargo area 10, a plurality of liquefied gas tanks 11 for storing liquefied gas are arranged in the front-rear direction. In addition, the number, arrangement, and shape of the liquefied gas tanks 11 are not limited.

[0022] The exhaust mast 20 is a device for discharging the combustible gas generated by gasifying the liquefied gas in the liquefied gas tank 11. The exhaust port 21 of the exhaust mast 20 of the present embodiment is located at the top, and the combustible gas is discharged from the exhaust port 21. When the combustible gas is discharged from the exhaust port 21, static electricity, lightning strike, etc. may become an ignition source and the combustible gas may catch fire. In addition to the combustible gas discharged from the exhaust port 21 of the exhaust mast 20, the liquefied gas leaking from the liquefied gas piping may also cause a fire. The exhaust mast 20 of the present embodiment is arranged corresponding to each liquefied gas tank 11. However, the number of exhaust masts 20 and the arrangement of exhaust masts 20 in the cargo area 10 are not limited.

[0023] The non-cargo area 30 is located in front of, behind, or both of the cargo area 10. The non-cargo area 30 of this embodiment includes a bow area 31 located in front of the cargo area 10 and a stern area 32 located behind the cargo area 10.

[0024] The building 40 is a facility at least partially located on the upper deck 42 of the hull 41. The building 40 of this embodiment includes a living area where the crew works and lives, and the building 40 is located in the stern area 32. In addition, both end portions of the building 40 in the ship width direction are located at a position closer to the inside in the ship width direction than the corresponding portions of the ship side 83 (the ship width direction edge of the hull 41).

[0025] The lifeboat 50 is a device for the crew to escape from the hull 41. The lifeboat 50 is, for example, a lifeboat, a life raft, etc. The lifeboat 50 of this embodiment is located in the stern area 32 and on both sides of the building 40 in the ship width direction. In addition, the lifeboat 50 of this embodiment is located on the upper deck 42, but it can also be suspended and located above the upper deck 42.

[0026] The refuge exit 60 is an exit for going outside the non-cargo area 30. The refuge exit 60 of the present embodiment is provided at both sides of the building 40 in the ship width direction and is connected to the outside of the stern area 32. In addition, the refuge exit 60 may not be provided in the building 40, and may be provided on the upper deck 42 of the non-cargo area 30, for example.

[0027] The refuge area 70 is an area connecting the lifeboat 50 and the refuge exit 60. Figure 2 The portion indicated by the oblique lines in the figure is the refuge area 70. The refuge area 70 of the present embodiment is an area directly connecting the lifeboat 50 and the refuge exit 60. However, in the case where there is an obstacle between the lifeboat 50 and the refuge exit 60, the refuge area 70 is an area connecting the lifeboat 50 and the refuge exit 60 to avoid the obstacle. That is, the refuge area 70 is an area that the crew members who come out of the refuge exit 60 usually pass through when heading to the lifeboat 50. In addition, the refuge area 70 includes not only a planar area but also a three-dimensional area such as an exposed staircase.

[0028] The shielding device 80 is a device for protecting the lifeboat 50 and the refuge area 70 from the heat and flame caused by the fire. The shielding device 80 includes a shielding plate 81. The shielding plate 81 is located at the boundary portion between the cargo area 10 and the stern area 32, and is a component that at least separates the exhaust port 21 of the exhaust mast 20 from the lifeboat 50 and the refuge area 70. The shielding plates 81 of this embodiment are located on both sides of the building 40 in the ship width direction, and extend from the building 40 to the ship side 83. In this case, part or all of the shielding plates 81 may be located at a position further back than the front surface of the building 40. In addition, each shielding plate 81 may be divided into a plurality of parts in the ship width direction. In addition, the shielding plates 81 may be located at a position further forward than the building 40. In addition, the shielding plates 81 may extend from the ship side 83 on one side in the ship width direction to the ship side 83 on the other side in the ship width direction. In addition, part or all of the shielding plates 81 may be located at a portion other than the boundary portion between the cargo area 10 and the non-cargo area 30.

[0029] In this way, the shielding plate 81 is located between the cargo area 10 (the exhaust port 21 of the exhaust mast 20), the lifeboat 50, and the refuge area 70, and at least the exhaust port 21 of the exhaust mast 20 is separated from the lifeboat 50 and the refuge area 70. Therefore, when a fire occurs in the cargo area 10, which is likely to grow in size, the lifeboat 50 and the refuge area 70 can be protected from the ignition of the combustible gas discharged from the exhaust port 21 of the exhaust mast 20 or the flame and heat generated when the combustible gas ignites. Therefore, when a fire occurs, the crew can safely reach the lifeboat 50 from the refuge exit 60.

[0030] The shielding plate 81 of the present embodiment is in the form of a flat plate and is perpendicular to the front-to-back direction. However, the shielding plate 81 may also be bent or curved. For example, the shielding plate 81 may also be composed of a vertical portion corresponding to a wall and a horizontal portion corresponding to a roof, and may be bent into an L-shape. In this case, the horizontal portion also functions as a rain shield. In addition, the shielding plate 81 may also be connected to or supported by surrounding structures such as the building 40. In addition, the shielding plate 81 may not be perpendicular to the front-to-back direction. For example, each shielding plate 81 may also be tilted in such a manner that the portion on the ship's side 83 is located at a position rearward of the portion on the central side in the ship's width direction. In addition, each shielding plate 81 may also be tilted in such a manner that the upper portion is located at a position rearward of the lower portion. If the shielding plate 81 is tilted in this way, the air resistance to which the shielding plate 81 is subjected when the ship 100 is sailing can be suppressed.

[0031] Furthermore, the shielding plate 81 of the present embodiment has a shape and size that makes the lifeboat 50 and the refuge area 70 a blind spot when viewed from the exhaust port 21 of each exhaust mast 20. Figure 1In the figure, the straight dashed line extending from the exhaust port 21 of the exhaust mast 20 is a line extending from the exhaust port 21 of the exhaust mast 20 closest to the shielding plate 81 and passing through the upper end of the shielding plate 81. That is, when viewed from the exhaust port 21 of the exhaust mast 20, the portion below the dashed line becomes a blind spot. By forming the shielding plate 81 as described above, even if the combustible gas discharged from the exhaust port 21 of the exhaust mast 20 catches fire or the combustible gas catches fire, the shielding plate 81 can protect the lifeboat 50 and the refuge area 70 from the flame and heat generated near the exhaust port 21.

[0032] In addition, the shielding device 80 of the present embodiment includes a water spray nozzle 82 for spraying water toward the shielding plate 81. The water spray nozzle 82 of the present embodiment sprays water toward the surface of the shielding plate 81 that is opposite to the cargo area 10, through the area (i.e., the cargo area 10) on the side opposite to the stern area 32 of the shielding plate 81. In this way, by spraying water toward the shielding plate 81, the shielding plate 81 can withstand the heat caused by the fire for a certain period of time, and by suppressing the increase in the temperature of the shielding plate 81, the lifeboat 50 and the refuge area 70 can be protected from the heat caused by the fire for a certain period of time. In addition, the water spray nozzle 82 and the pipe for supplying water to the water spray nozzle 82 may be fixed to the shielding plate 81 or may be fixed to a portion different from the shielding plate 81. The water spray nozzle 82 may be away from the shielding plate 81 as long as it can spray water toward the shielding plate 81.

[0033] In addition, the shielding device 80 may also include the water jet nozzle 82 and set the shielding plate 81 as an A-60 class partition. Here, "A-60 class partition" refers to the partition defined in SOLAS (International Treaty for the Safety of Life at Sea). Specifically, the A-60 class partition is a partition that has been heat-resistant processed using non-combustible materials in the following manner: within 60 minutes from the occurrence of the fire, the average temperature of the side not exposed to the fire does not rise by more than 140 degrees Celsius compared to the initial temperature, and the temperature of any point including the joint does not rise by more than 180 degrees Celsius compared to the initial temperature. However, the shielding device 80 may also include the water jet nozzle 82 and set the shielding plate 81 as an A-60 class partition. According to this structure, the increase in the temperature of the shielding plate 81 can be further suppressed.

[0034] The shielding device 80 of this embodiment includes the shielding plate 81, but may include a water curtain instead of the shielding plate 81. Even in this case, the shielding device 80 can protect the lifeboat 50 and the refuge area 70 from the flame and heat generated at the exhaust port 21 of the exhaust mast 20.

[0035] (Second embodiment)

[0036] Next, a ship 200 according to the second embodiment will be described. In the following, in the configuration of the ship 200 according to the second embodiment, differences from the ship 100 according to the first embodiment will be mainly described, and duplicate descriptions will be omitted. Figure 3 2 is a top view of a ship 200 according to the second embodiment. Figure 4 It is a side view of the ship 200 according to the second embodiment.

[0037] like Figure 3 and Figure 4 As shown, in the ship 200 of the second embodiment, the building 40, lifeboat 50, refuge exit 60 and refuge area 70 are located not only in the stern area 32 but also in the bow area 31, and the shielding equipment 80 is located not only on the stern area 32 side but also on the bow area 31 side.

[0038] In the present embodiment, the building 40 located in the bow area 31 includes a living area, and the building 40 located in the stern area 32 includes an engine room. In addition, both end portions of the building 40 located in the bow area 31 in the ship width direction are located near the ship side 83, and the outer portion in the ship width direction is lower than the central portion in the ship width direction. That is, the building 40 located in the bow area 31 has a stepped structure. In other words, the width of the building 40 located in the bow area 31 is wider in the ship width direction at the lower portion, and narrower in the ship width direction at the upper portion. In addition, the upper surface of the outer portion in the ship width direction of the building 40 is located above the upper deck 42, and the lifeboat 50 and the refuge area 70 are located on this upper surface.

[0039] The shielding plate 81 of the present embodiment is located at the outer side of the building 40 in the bow area 31 in the ship width direction, and separates the discharge port 21 of the exhaust mast 20 from the lifeboat 50 and the refuge area 70. In addition, the shielding plate 81 located on the bow area 31 side also has a shape and size that makes the lifeboat 50 and the refuge area 70 a blind spot when viewed from the discharge port 21 of each exhaust mast 20. Therefore, the lifeboat 50 and the refuge area 70 located in the bow area 31 can be protected from the ignition of the combustible gas discharged from the discharge port 21 of the exhaust mast 20 or the flame and heat generated when the combustible gas ignites.

[0040] In the first embodiment, each device such as the lifeboat 50 is located only on the stern area 32 side, and in the second embodiment, each device such as the lifeboat 50 is located on both the bow area 31 side and the stern area 32 side. However, each device such as the lifeboat 50 may be located only on the bow area 31 side. In addition, the shape of the building 40 located in the bow area 31 and the position of the lifeboat 50 in the bow area 31 are not limited to the above-mentioned positions.

[0041] (Third embodiment)

[0042] Next, a ship 300 according to a third embodiment will be described. Figure 5 3 is a top view of a ship 300 according to the third embodiment. Figure 6 1 is a side view of a ship 300 according to the third embodiment. The ship 300 according to the third embodiment is not a liquefied gas transport ship but a liquefied gas fuel ship, which is different from the ships 100 and 200 according to the first and second embodiments. That is, although the ship 300 according to this embodiment also has a liquefied gas tank 11, the liquefied gas tank 11 is used exclusively to store liquefied gas used as fuel.

[0043] However, the ship 300 of this embodiment has different configurations and the like, but has the same components as the ships 100 and 200 of the first and second embodiments. Figure 5 and Figure 6 In, with Figures 1 to 4 The same reference numerals are used to denote the same or corresponding components. Hereinafter, the components of the ship 300 of the present embodiment will be described mainly with respect to the components that are different from the components of the ships 100 and 200 of the first and second embodiments.

[0044] The building 40 of the present embodiment is located at the stern portion of the hull 41. However, the building 40 may be located at a portion other than the stern portion of the hull 41. The liquefied gas tanks 11 are located on both sides of the building 40 in the ship width direction. In the present embodiment, the liquefied gas tanks 11 are located on the upper deck 42. However, the number and position of the liquefied gas tanks 11 are not particularly limited. For example, the liquefied gas tanks 11 may be located at a position lower than the upper deck 42, that is, inside the hull 41. The exhaust mast 20 extending upward from the two liquefied gas tanks 11 is located at the two liquefied gas tanks 11. The exhaust port 21 is located at the top of the exhaust mast 20, and the combustible gas generated by the gasification of the liquefied gas in the liquefied gas tank 11 is discharged from the exhaust port 21. In addition, the number and position of the exhaust mast 20 are not limited.

[0045] The lifeboat 50 is located behind the building 40 and is held on a holding platform 90 located above the upper deck 42. However, the number and position of the lifeboat 50 are not limited. In addition, the holding platform 90 is connected to the upper deck 42 through an exposed step 91. The refuge exit 60 is located on both sides of the width direction of the building 40. The refuge exit 60 is connected to the outdoor of the hull 41. In addition, the refuge area 70 of this embodiment is Figure 6 The part indicated by slashes.

[0046] The shielding device 80 of the present embodiment also includes a shielding plate 81. However, the shielding plate 81 is configured to surround the liquefied gas tank 11 from the front, rear, and inside in the ship width direction. In addition, when the liquefied gas tank 11 is located below the upper deck 42, the shielding plate 81 is configured to surround the exhaust mast 20. The shielding plate 81 of the present embodiment also has a shape and size that makes the lifeboat 50 and the refuge area 70 a blind spot when viewed from the exhaust port 21 of each exhaust mast 20. Therefore, even if the combustible gas discharged from the exhaust port 21 of the exhaust mast 20 catches fire or the combustible gas catches fire, the shielding plate 81 can protect the lifeboat 50 and the refuge area 70 from the flame and heat generated near the exhaust port 21.

[0047] In addition, the shielding device 80 of this embodiment also includes a water jet nozzle 82 for jetting water toward the shielding plate 81. However, the shielding device 80 may also include the water jet nozzle 82 instead of the shielding plate 81 being an A-60 class partition. Furthermore, the shielding device 80 may include the water jet nozzle 82 and the shielding plate 81 being an A-60 class partition. According to these structures, the rise in the temperature of the shielding plate 81 can be suppressed.

[0048] The embodiments described above are merely examples, and the shapes, numbers, positions, sizes, etc. of the components are not limited to those shown in the embodiments.

[0049] Summary

[0050] Item 1 disclosed in the present specification is a ship, which comprises: a liquefied gas tank that stores liquefied gas; an exhaust mast that discharges flammable gas generated by the gasification of liquefied gas in the liquefied gas tank; a lifeboat that is located outside the house; an escape exit that is connected to the outside of the house; a refuge area that connects the lifeboat to the escape exit; and a shielding device that separates the exhaust outlet of the exhaust mast from the lifeboat and the refuge area.

[0051] According to this structure, when a fire related to liquefied gas that is likely to grow in size occurs, the lifeboat and the refuge area can be protected from the ignition of the combustible gas discharged from the exhaust port of the exhaust mast or the flame and heat generated when the combustible gas ignites. Therefore, when a fire occurs, the crew can safely reach the lifeboat.

[0052] Item 2 disclosed in this specification is the ship according to Item 1, wherein the shielding equipment has a shape and size such that the lifeboat and the evacuation area become blind spots when viewed from the exhaust port of the exhaust mast.

[0053] According to this configuration, even if the combustible gas discharged from the exhaust port of the exhaust mast ignites or the combustible gas ignites, the lifeboat and the evacuation area can be protected from the flame and heat generated near the exhaust port.

[0054] Item 3 disclosed in this specification is the ship according to Item 1 or 2, wherein the shielding equipment includes a shielding plate located between the exhaust port of the exhaust mast and the lifeboat and the refuge area.

[0055] According to this configuration, the shielding device can shield the exhaust port of the exhaust mast from the lifeboat and the refuge area with a simple structure.

[0056] A fourth aspect of the present specification is the ship according to the third aspect, wherein the ship further comprises a building at least partly located on the upper deck, and the shielding plate is located between the building and the ship side.

[0057] According to this configuration, the length of the shielding plate in the ship width direction can be shortened compared to a case where the shielding plate extends from the ship side on one side in the ship width direction to the ship side on the other side in the ship width direction.

[0058] Item 5 disclosed in this specification is the ship according to Item 3 or 4, wherein the shielding equipment further includes a water jet nozzle for jetting water toward the shielding plate.

[0059] According to this structure, the shielding plate can withstand the heat caused by the fire for a certain period of time.

[0060] Item 6 disclosed in the present specification is the ship according to any one of Items 3 to 5, wherein the shielding plate is an A-60 class partition.

[0061] According to this structure, the shielding plate can withstand the heat caused by the fire for a certain period of time.

[0062] Item 7 disclosed in this specification is the ship according to any one of Items 3 to 6, wherein the shielding plate is inclined so that a portion on the ship side is located rearward of a portion on the center side in the ship width direction.

[0063] According to this structure, the air resistance which the shielding plate receives when the ship is sailing can be suppressed.

[0064] Description of symbols

[0065] 11: liquefied gas tank; 20: exhaust mast; 21: exhaust outlet; 40: building; 50: lifeboat; 60: refuge exit; 70: refuge area; 80: shielding equipment; 81: shielding board; 82: water jet nozzle; 83: ship's side; 100: ship; 200: ship; 300: ship.

Claims

1. A vessel having: Liquefied gas tanks, which store liquefied gas; an exhaust mast for exhausting the combustible gas generated by gasification of the liquefied gas in the liquefied gas tank; lifeboat, which is located outside the house; An escape exit, which is connected to the outside of the house; a refuge area connecting the lifeboat to the refuge exit; and A shielding device separates the exhaust outlet of the exhaust mast from the lifeboat and the refuge area.

2. The vessel according to claim 1, wherein: The shielding device has a shape and a size such that the lifeboat and the refuge area become blind spots when viewed from the exhaust port of the exhaust mast.

3. The vessel according to claim 1, wherein: The shielding device includes a shielding plate located between the exhaust outlet of the exhaust mast and the lifeboat and the refuge area.

4. The vessel according to claim 3, wherein: The vessel also has a building at least partly located on the upper deck, The shielding plate is located between the building and the ship's side.

5. The vessel according to claim 3, wherein: The shielding device further includes a water spray nozzle that sprays water toward the shielding plate.

6. A vessel according to claim 3 or 5, wherein: The shielding plates are A-60 grade separators.

7. The vessel according to claim 3, wherein: The shielding plate is inclined so that a portion on the ship side is located rearward of a portion on the center side in the ship width direction.

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