KR102473787B1 - Ship - Google Patents

Abstract

In this ship, on the hull 10, the bridge disposed at the upper part of the stern side of the hull 10, the main engine 40 provided in the hull 10, and the upper deck 13 of the hull 10 A fuel tank 50 having an outer circumferential surface extending along an axis O that is provided on the bow side of the bridge and stores fuel of the main engine and slopes downward toward the bow side, and a fuel tank 50 ), a suction port is disposed at a part on the bow side in the inside, and a pump 70 for sucking out fuel is provided.

Description

Ship

The present invention relates to ships. This application claims priority based on Japanese Patent Application No. 2017-076856 for which it applied to Japan on April 7, 2017, and uses the content here.

DESCRIPTION OF RELATED ART As a carrier ship as a type of ship, the carrier ship in which the cargo tanks which store liquefied gas, such as LNG, are arranged in multiple numbers in the bow and aft direction is known (for example, refer patent document 1, 2). These plurality of cargo tanks are spherical tanks forming a spherical shape. The spherical tank is provided so that its upper half protrudes from the upper deck on the bow side of the bridge provided on the stern side of the ship.

In the carriers of Patent Literatures 1 and 2, among a plurality of spherical tanks arranged in the fore and aft direction, the height of the spherical tanks arranged on the bow side is set to the stern side so that the view from the bridge to the water surface in front can be secured. A configuration that makes it smaller than the spherical tank is disclosed.

Japanese Unexamined Patent Publication No. 9-24891 Japanese Unexamined Patent Publication No. 61-241293

In the said carrier ship, the liquefied gas of the cargo tank as a cargo can also be used as fuel for the main engine of a ship as it is. However, there is a case where a fuel tank for storing fuel is installed separately from a cargo tank for storing liquefied gas due to a request to separate cargo and fuel.

It is preferable to make such a fuel tank as large as possible in order to secure the cruising distance of a ship. In addition, since it is necessary to install a fuel tank in a limited space in a ship, there are restrictions on the installation position of the fuel tank and the size of the fuel tank.

In particular, depending on where the fuel tank is installed, there is a possibility that the view from the bridge to the water surface is obstructed. On the other hand, in order to appropriately pump out the fuel in the fuel tank by means of a pump, it is necessary to pay attention to the position of the fuel tank in order to secure the liquid level of the fuel at the pump installation position in the fuel tank.

The present invention provides a ship capable of securing the size of a fuel tank and the ability to draw fuel while securing a view from a bridge.

According to the first aspect of the present invention, a ship includes a hull, a bridge disposed in the upper part of the stern side of the hull, a main engine provided in the hull, and a bow side of the bridge on the upper deck of the hull Provided, fuel of the main engine is stored, and a fuel tank having an outer circumferential surface extending along an axis inclined downward toward the bow side, and a suction port disposed at a bow side portion in the fuel tank, the fuel It is provided with a pump that sucks out.

According to the ship of the said aspect, the outer peripheral surface of the fuel tank installed in the upper deck extends along the axis line which inclines downward toward the bow side. As a result, the volume of the fuel tank can be increased within the range in which the field of view can be secured while securing the field of vision from the bridge to the front of the player.

Further, since the pump is configured to suck fuel from the bow side of the fuel tank at the bottom of the slope of the fuel tank, even when the fuel in the fuel tank is relatively low, the head of the pump at the time of intake can be secured. have. For this reason, it is possible to reduce the remaining fuel in the fuel tank from being used up to the end.

According to the second aspect of the present invention, it is preferable that the upper tank line and the lower tank line forming the outer circumferential surface of the fuel tank are parallel to the axis line, as viewed in the line width direction.

Since the upper tank line slopes downward toward the bow side, it is possible to avoid obstructing the forward view of the bow from the bridge. Also, since the lower tank line inclines downward toward the bow side, when the fuel in the fuel tank becomes low, the fuel collects in front of the fuel tank. For this reason, the fuel accumulated in the front can be sucked out by the pump provided on the bow side in the fuel tank.

According to the third aspect of the present invention, the upper tank line extends along a line of view required connecting the bridge and the water surface in front of the player, as viewed in the line width direction.

Accordingly, the maximum capacity of the fuel tank can be secured within a range in which the fuel tank does not obstruct the view from the bridge to the front of the bow, that is, in a range in which the ship's view-related rules are not violated.

According to the fourth aspect of the present invention, it is preferable that the outer circumferential surface of the fuel tank has a cylindrical surface shape centered on the axis line.

Thereby, the cost on fuel tank manufacture can be held down. In addition, a pressure-resistant structure for storing fuel in a high-pressure state can be manufactured at low cost.

According to a fifth aspect of the present invention, a cargo hold is formed in the hull and has a cargo tank disposed in the cargo hold and accommodating liquefied gas.

Even if the cargo tank for storing liquefied gas and the fuel tank for storing fuel are provided separately, as described above, the visibility from the bridge and the consumption of fuel in the fuel tank can be ensured while maximizing the capacity of the fuel tank. can

According to the ship, it is possible to secure the size of the fuel tank and the suction property of the fuel while securing the view from the bridge.

1 is a side view of a carrier vessel according to an embodiment.
FIG. 2 is an enlarged view of a main part of FIG. 1 .
3 is a cross-sectional view orthogonal to the axial line of a fuel tank of a carrier vessel according to an embodiment.
4 is a diagram for explaining a visual field request line.
Fig. 5A is a cross-sectional view perpendicular to the axis of the fuel tank of a carrier vessel showing a first modification of the fuel tank.
Fig. 5B is a cross-sectional view perpendicular to the axis of the fuel tank showing a second modified example of the fuel tank of the carrier ship.
Fig. 5C is a cross-sectional view perpendicular to the axial line of the fuel tank of the carrier vessel, showing a third modification of the fuel tank.

Hereinafter, the ship 100 according to the first embodiment of the present invention will be described in detail with reference to the drawings. The ship 100 of this embodiment is a liquefied gas carrier that transports liquefied petroleum gas (LPG) as liquefied gas.

As shown in FIG. 1 , a ship 100 includes a hull 10, a bridge 20, a cargo tank 30, a main engine 40, a fuel tank 50, and a pump 70.

The hull (10) has a side (11), a ship's bottom (12), and an upper deck (13). The side 11 is composed of a pair of side shell plates constituting the left and right sides 11, respectively. The ship bottom 12 is composed of a ship bottom shell plate that connects the left and right sides 11 to each other from the bottom.

The upper deck 13 connects a pair of left and right sides 11 above the ship bottom 12 . The upper deck 13 is an exposed deck extending from the bow to the stern. The upper deck 13 extends in the horizontal direction. As for the upper deck 13, the stern side of the said ship 100 goes down depending on the sailing condition of the ship 100, and the stern side of the upper deck 13 itself may also incline downward.

The hull 10 has a cross-sectional shape orthogonal to the fore and aft direction formed by these side 11, the ship bottom 12, and the upper deck 13 into a substantially box shape forming a space therein. The part on the stern side in the said ship body 10 becomes the engine room 14. The part on the bow side rather than the engine room 14 in ship body 10 becomes the cargo hold 15 partitioned by the engine room 14 and a bulkhead.

The bridge 20 is provided so as to extend upward from the upper part of the hull 10. The bridge 20 is provided on the stern side in the upper part of the ship body 10 and is provided above the engine room 14 . The bridge 20 has a plurality of layers. On the upper floor of the bridge 20, a cockpit 21 for manipulating the vessel 100 is provided. The cockpit 21 is configured so that the front of the ship 100 can be viewed from a high place.

The cargo tank 30 is provided so that a plurality (three in this embodiment) may be arranged in the cargo hold 15 of the ship body 10 in the fore and aft direction. Partitions between the adjacent cargo tanks 30 comrades are provided with partition walls that divide compartments in which each cargo tank 30 is accommodated.

이하로 함으로써, 상압에서 액화된다. 이로 인하여, 선박(100)에는, LPG를 저온 액화 상태로 유지하기 위한 도시하지 않은 증발 가스 처리 장치가 마련되어 있다. 증발 가스 처리 장치로서는, 재액화 장치가 채용되고 있다.The cargo tank 30 of this embodiment is a square tank constructed by bonding flat tank wall portions to each other. In the cargo tank 30, LPG as a cargo is stored at normal pressure and low temperature. In addition, "at normal pressure and low temperature state" means the state in which the liquefaction state of LPG is maintained only by making LPG low temperature without pressurizing it. LPG is about -46

By carrying out below, it liquefies at normal pressure. For this reason, the ship 100 is provided with a boil-off gas treatment device (not shown) for maintaining LPG in a low-temperature liquefied state. As the boil-off gas treatment device, a reliquefaction device is employed.

이하의 온도)가 유지되고 있다.The re-liquefying device cools the boil-off gas discharged by vaporizing LPG in the cargo tank 30 by external heat from the outside of the cargo tank 30 and liquefies it again. The gas liquefied in this way is returned to the cargo tank 30 as LPG. Thus, the low-temperature liquefaction state in LPG (e.g. -46

temperature below) is maintained.

The main engine 40 is disposed in the engine room 14 in the ship body 10 . The main engine 40 of this embodiment is driven with LPG as fuel. Here, the fuel of the main engine 40 is not limited to LPG, and may be a combination (bifuel) or a mixture (dual fuel) of LPG and other fuels. By driving the main engine 40, the screw 41 provided below the stern of the ship body 10 rotates.

Next, the fuel tank 50 will be described with reference to FIG. 2 . The fuel tank 50 of this embodiment stores LPG serving as fuel for the main engine 40 . The fuel tank 50 is provided on the upper deck 13 . In this embodiment, it is provided on the upper deck 13 above the center cargo tank 30 among the cargo tanks 30 in which three were arranged in the fore and aft direction, for example.

The fuel tank 50 is capable of storing LPG at high pressure and normal temperature. For this reason, the fuel tank 50 is constituted by a pressure-resistant container. In addition, the "high-pressure normal temperature state" means a state in which the liquefied state of LPG is maintained only by pressurizing the LPG without cooling it.

The fuel tank 50 has a tubular portion 51 and a pair of lid portions 52 . The tubular portion 51 has a tubular shape centered on the axis O. In this embodiment, as shown in FIG. 3 , the cross-sectional shape orthogonal to the axis line O of the tubular portion 51 has formed a circle, that is, the tubular portion 51 has formed a cylindrical shape. The thickness of the wall constituting the tube portion 51 is constant. The dimension of the tube portion 51 in the direction of the axis line O is larger than the diameter of the tube portion 51 . That is, in the fuel tank 50, the direction of the axis line O is the longitudinal direction.

The pair of cover portions 52 are provided so as to block both ends of the cylinder portion 51 in the direction of the axis line O. For example, the tubular portion 51 has a curved shape protruding outward from both ends of the tubular portion 51, and preferably has a spherical shape. In this way, the fuel tank 50 is constituted by the cylindrical portion 51 forming a cylindrical shape and the pair of cover portions 52 forming a curved surface, thereby forming a cylindrical shape as a whole, thereby ensuring pressure resistance. The outer circumferential surface centered on the axis of the fuel tank 50 also has a cylindrical surface shape. The capacity of the fuel tank 50 is sufficiently smaller than the capacity of the cargo tank 30 .

Such a fuel tank 50 is provided on the upper deck 13 so as to incline downward as the axis line O faces the bow side. That is, the fuel tank 50 extends along the axis O that goes downward as it goes to the bow side. The axis line O coincides with the bow and aft direction when the ship 100 is viewed from a plane. A pair of fuel tanks 50 may be arranged so that mutual axes O are parallel to each other when spaced apart in the line width direction and viewed in plan.

An axis line O arranged above the upper deck 13 is inclined with respect to the upper deck 13 so as to approach the upper deck 13 as it goes toward the bow side. The inclination angle of the axis O with respect to the upper deck 13 is such that the axis O is in the horizontal plane even when the stern side of the ship 100 and the upper deck 13 are going down during navigation of the ship 100. It is to such an extent that it can maintain an inclination downward as it faces the bow side.

As shown in Fig. 2, a line connecting the upper ends of the outer circumferential surfaces of the cylinder portion 51 of the fuel tank 50 at each position in the fore and aft direction is referred to as an upper tank line La. The upper tank line La forms an upper outline when viewed from the side of the ship 100. A line connecting the lower ends of the outer circumferential surfaces of the cylinder portion 51 of the fuel tank 50 at each position in the fore and aft direction is referred to as a lower tank line Lb. The lower tank line Lb forms a downward outline when viewed from the side surface of the ship 100.

These upper tank line La and lower tank line Lb incline downward toward the bow side. In this embodiment, the upper tank line La and the lower tank line Lb are parallel to the axis line O. Since the thickness of the tubular portion 51 constituting the fuel tank 50 is constant, the lower tank line Lb is inclined, so that the bottom surface that divides the space in the fuel tank 50 is also lower tank line Lb. is inclined in the same way as

As an example, the inclined attitude of the fuel tank 50 as described above is achieved by the tank support 60 supporting the inclined tank. The tank support portion 60 supports the fuel tank 50 on the upper deck 13 so that the axis O of the fuel tank 50 is inclined as described above. For example, in this embodiment, the fuel tank 50 is supported by the upper end of the bow side support part 61 and the stern side support part 62. The bow side support part 61 and the stern side support part 62 are each fixed on the upper deck 13, and the upper end of the stern side support part 62 is located above the upper end of the bow side support part 61. In this way, the inclined attitude of the fuel tank 50 is maintained according to the height difference between the stern side support part 62 and the bow side support part 61 . In addition, the configuration of the tank support portion 60 is not limited to the above configuration, and other configurations may be used as long as the fuel tank 50 can be supported on the upper deck 13 in an inclined posture.

Here, with reference to FIG. 4, the inclined attitude of the fuel tank 50 will be described in more detail. The fuel tank 50 is disposed on the upper deck 13 so as to fall below the visual field demand line Lv shown in FIG. 4 . Here, the field of view demand line Lv is the shorter of the cockpit 21 in the bridge 20 and the full length Loa of the ship 100 from the bow in the front water surface of the bow twice or 500 m. It is an imaginary line connecting the locations.

That is, in the ship 100, according to the rules, structures such as the fuel tank 50 on the upper deck 13 are twice the total length or 500 m from the bow of the water surface ahead of the bow from the cockpit 21 of the bridge 20 It is determined as a requirement that the view to the position of the shorter side is not obstructed. More specifically, the base end of the bridge 20 side of the view request line Lv is at a position of 750 mm from the front wall surface in front of the cockpit 21 toward the stern side, and at a position of 1800 mm from the floor surface. determined by location. If the fuel tank 50 is disposed below the visibility request line Lv, that is, if the upper tank line La of the fuel tank 50 is not located beyond the visibility request line Lv, the Satisfy the demands made by the rules.

In order to increase the volume of the fuel tank 50 as much as possible, it is preferable that the upper tank line La of the fuel tank 50 be arranged as close as possible to the view request line Lv. The upper tank line La of the fuel tank 50 may be parallel to the visual field request line Lv. The upper tank line La of the fuel tank 50 may extend in line with the field of view request line Lv. That is, the upper tank line La of the fuel tank 50 should just extend along the view request line Lv.

Next, the pump 70 will be described. As shown in FIG. 2 , the pump 70 has a role of pressurizing LPG in the fuel tank 50 to the main engine 40 . A drive unit such as an electric motor for driving the pump 70 may be provided inside the fuel tank 50 or may be provided outside the fuel tank 50 . In particular, since the LPG stored in the fuel tank 50 has insulating properties, there is no problem even if the driving unit is provided in the fuel tank 50.

The suction port of the pump 70 is provided in the part on the bow side in the fuel tank 50. In particular, in the present embodiment, the suction port of the pump 70 is arranged near the boundary between the tube portion 51 in the space within the fuel tank 50 and the cover portion 52 on the bow side. It is preferable that the suction port of the pump 70 is provided at a location located at the bottommost position in the space within the fuel tank 50 or close to the location. It is preferable that the suction port of the pump 70 is provided corresponding to the location where the lower tank line Lb of the fuel tank 50 is located at the lowest point. The fuel drawn from the pump 70 is transported to the main engine 40 through the pipe 71.

Next, the operation of this embodiment will be described.

In this embodiment, the outer circumferential surface of the fuel tank 50 installed on the upper deck 13 extends along an axis O inclined downward toward the bow side. Accordingly, it is possible to increase the volume of the fuel tank 50 within a range in which the field of view can be secured while securing a large field of view from the cockpit 21 of the bridge 20 to the front of the player.

That is, if the fuel tank 50 is inclined toward the bow, it is possible to suppress obstruction of the view looking down from the cockpit 21 of the bridge 20 toward the water surface toward the bow. In addition, since the stern side of the fuel tank 50 is positioned upward due to the inclined posture, the fuel tank 50 occupies a space that has not been used so far and does not obstruct the view. Due to this, the effective capacity of the fuel tank 50 capable of storing fuel can be expanded.

Also, when the fuel in the fuel tank 50 is relatively small because the pump 70 sucks fuel from the portion on the bow side in the fuel tank 50 that is below the slope of the fuel tank 50. Even if it is, the head of the pump 70 at the time of suction can be secured. That is, as shown in FIG. 2 , when the remaining amount of LPG in the fuel tank 50 is reduced, the LPG is collected at the bow side in the fuel tank 50 according to the inclination of the fuel tank 50 . As the pump 70 sucks the collected LPG through the suction port, it is possible to reduce the remaining fuel in the fuel tank 50 because it is not used up to the end. That is, the pump 70 can ensure the suctioning of fuel.

Here, if the inclined posture of the fuel tank 50 is opposite to that of the present embodiment, that is, when the axis line O of the fuel tank 50 is inclined downward toward the stern side, the fuel tank ( 50)'s player's side is positioned upward. In this case, there is a possibility that the view from the cockpit 21 of the bridge 20 is obstructed. In addition, in order to secure the field of view, the fuel tank 50 must be installed further toward the stern, which hinders the freedom of installation. In addition, if the fuel tank 50 is to be installed on the bow side so as not to obstruct the view from the bridge 20, the fuel tank 50 itself needs to be made small, reducing the effective volume.

On the other hand, if the fuel tank 50 is arranged so that the axis line O of the fuel tank 50 extends downward toward the bow side as in the present embodiment, the fuel tank 50 can be disposed on the front side of the upper deck 13, that is, the degree of freedom of arrangement of the fuel tank 50 on the deck can be improved. In addition, the capacity of the fuel tank 50 can be maximized within a range in which the view from the bridge 20 is not obstructed.

In addition, especially in this embodiment, the upper tank line La and the lower tank line Lb of the fuel tank 50 are parallel to the inclined axis O. That is, since the upper tank line La slopes downward toward the player's side, obstruction of the player's forward view from the bridge 20 can be further avoided. Further, since the lower tank line Lb inclines downward toward the bow side, the bottom surface constituting the inner space of the fuel tank 50 also inclines in the same way. For this reason, when the amount of LPG in the fuel tank 50 decreases, the fuel in the fuel tank 50 is guided to the bow side by the bottom surface, so that the LPG can be collected in the part on the bow side in the fuel tank 50. . For this reason, with the pump 70 provided in the bow side in the fuel tank 50, the fuel collected in the front can be suctioned out with high efficiency.

In addition, since the upper tank line La extends along the sight line Lv connecting the bridge 20 and the water surface in front of the player, as viewed in the line width direction, while satisfying the required rules, the fuel tank 50 ) can ensure the maximum capacity of the fuel tank 50 within a range in which the view from the bridge 20 to the front of the player is not hindered.

In addition, because the fuel tank 50 has a cylindrical shape, the manufacturing cost of the fuel tank 50 can be reduced. In addition, a pressure-resistant structure for storing fuel in a high-pressure state can be manufactured at low cost.

And, as in the present embodiment, even if the cargo tank 30 for storing LPG as cargo and the fuel tank 50 for storing LPG as fuel are separately provided, as described above, the volume of the fuel tank 50 It is possible to ensure visibility from the bridge 20 and fuel extraction performance in the fuel tank 50 while securing the maximum.

As mentioned above, although embodiment of this invention was described, this invention is not limited to this, It can change suitably within the range which does not deviate from the technical idea of the invention.

For example, as a first modification, the fuel tank 150 shown in FIG. 5A may be employed. The fuel tank 150 of the first modified example has a shape in which two cylindrical portions 151 each extending in the direction of the axis line O are disposed parallel to each other and united in part in the circumferential direction.

Also, as a second modified example, the fuel tank 160 shown in FIG. 5B may be employed. The fuel tank 160 of the second modified example has an upper plate portion 161 and a lower plate portion 162 extending along the axis line O and opposing each other in the vertical direction. Both sides of the upper plate portion 161 and the lower plate portion 162 in the line width direction are connected by a curved portion 163 in an arc shape.

As a third modified example, the fuel tank 170 shown in FIG. 5C may be employed. The fuel tank 170 of the third modified example is composed of a rectangular tube portion 171 extending along the axis line O and having a rectangular cross section.

In any of the first to third modifications, the fuel tanks 150, 160, and 170 have an outer circumferential surface extending along an axis O that slopes downward toward the bow side and an upper tank included in the outer circumferential surface. It has a line La and a lower tank line Lb. Therefore, the same effect as the embodiment is exhibited.

In the embodiment, the fuel stored in the fuel tank 50 is LPG, but other liquefied gas such as LNG may be used as the fuel. Moreover, the cargo stored in the cargo tank 30 is not limited to LPG, and other liquefied gas may be sufficient as it. In addition, liquids and materials other than liquefied gas may be sufficient as the cargo stored in the cargo tank 30.

According to this ship, it is possible to secure the size of the fuel tank and the suction property of the fuel while securing the view from the bridge.

10 hull
11 broadside
12 bottom
13 upper deck
14 engine room
15 Cargo Hold
20 bridge
21 cockpit
30 cargo tank
40 cycle engine
41 screw
50 fuel tank
51 Tongbu
52 cover
60 tank support
61 Athlete side support
62 stern side support
70 pump
71 plumbing
100 ships
150 fuel tank
151 cylinder
160 fuel tank
161 top plate
162 lower plate
163 bend
170 fuel tank
171 leg tube
O axis
Lv sight line
La upper tank line
Lb lower tank line

Claims (5)

hull and
A bridge disposed on the upper part of the stern side of the hull;
A main engine provided in the hull;
A fuel tank provided on the bow side of the bridge on the upper deck of the hull, storing fuel for the main engine, and having an outer circumferential surface extending along an axis inclined downward toward the bow side;
A suction port is disposed at a portion on the bow side in the fuel tank, and a pump for sucking the fuel is provided,
The fuel tank includes a tube portion and a pair of cover portions;
In the pump, a suction port is disposed at a boundary between the tube portion and the lid portion on the bow side in a space in the fuel tank,
The fuel tank is supported by the upper end of the bow side support part and the stern side support part,
The bow side support part and the stern side support part are each fixed on the upper deck,
The upper end of the stern side support is located above the upper end of the bow side support,
An upper tank line and a lower tank line constituting the outer circumferential surface of the fuel tank as viewed in the line width direction are parallel to the axis, respectively;
The upper tank line extends along a view request line connecting the bridge and the water surface in front of the bow, as viewed in the ship width direction. delete delete According to claim 1,
A vessel in which an outer circumferential surface of the fuel tank forms a cylindrical surface shape centered on the axis line. According to claim 1 or 4,
A cargo hold is formed in the hull,
A ship disposed in the cargo hold and having a cargo tank accommodating liquefied gas.

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