JP6712570B2 - Ship - Google Patents

Description

The present invention relates to a ship.

Diesel engines that use heavy oil as fuel are used in ships that carry liquefied gas and cargo. On the other hand, in recent years, some ships use natural gas as a fuel other than heavy oil.

For example, Patent Document 1 describes a liquefied gas fuel vessel that uses LNG (Liquified Natural Gas) as a fuel. This liquefied gas fuel ship has a vaporized gas processing unit including a buffer tank capable of storing the vaporized gas, and a reliquefaction device unit capable of reliquefying the vaporized gas. This makes it possible to easily process the boil-off gas (BOD) with respect to LNG used as fuel.

JP, 2010-23776, A

By the way, there is a ship in which LPG (Liquified Petroleum Gas) is used instead of LNG as natural gas as a fuel. Unlike LNG, LPG can be liquefied only by increasing the pressure without lowering the temperature. This LPG is used at room temperature when used in a main engine or the like that drives a propulsion device of a ship. Further, if LPG is stored at a low temperature, it may spontaneously evaporate. Therefore, it is preferable that the LPG used as a fuel in a ship is liquefied and stored in a room temperature and pressurized state for efficient use and storage. On the other hand, there are cases where LPG is liquefied and stored in a low temperature and normal pressure state at an LPG fuel supply source such as an LPG supply terminal, a dedicated loading ship, and a tank truck. Therefore, it is necessary to pressurize the LPG when loading the LPG from these fuel supply sources into the fuel tank in the ship.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a ship capable of pressurizing and storing LPG for fuel regardless of the state of the LPG in the fuel supply source. ..

The present invention adopts the following means in order to solve the above problems.
A ship according to a first aspect of the present invention uses a hull, an LPG fuel tank provided in the hull for storing LPG liquefied under pressure, and the LPG stored in the LPG fuel tank as fuel. A drive unit to be driven, a fuel line connectable to a fuel supply source outside the hull, and a fuel line for sending the LPG sent from the fuel supply source to the LPG fuel tank; and a fuel line provided in the middle of the fuel line. And a booster pump for boosting the pressure of the LPG sent from the fuel supply source, a cargo tank provided in the hull for storing the liquefied LPG therein, and connectable to the fuel supply source. And a cargo line that supplies the LPG from the fuel supply source to the cargo tank, and a high-pressure unloading line that is connectable to the fuel supply source and that sends the LPG in the cargo tank to the fuel supply source. wherein the boosting pump is provided in the middle of the high-pressure unloading line, it boosts the LPG sent from the cargo tanks.

With such a configuration, even if the LPG supplied from the fuel supply source is liquefied in the low temperature and normal pressure state, the LPG is boosted and sent to the LPG fuel tank. Therefore, the LPG can be boosted and sent to the LPG fuel tank regardless of the state of the LPG in the fuel supply source. As a result, the LPG can be pressurized and stored in the LPG fuel tank.
In addition, the LPG necessary for operating the ship, which is stored in the LPG fuel tank, can be transferred using the same booster pump and heating unit. Therefore, the booster pump and the heating unit can be shared. As a result, the cost and space for newly installing equipment for boosting the LPG can be suppressed.

Further, in the ship according to the second aspect of the present invention, in the first aspect, a heating unit which is provided in the middle of the fuel line and heats the LPG boosted by the booster pump may be provided.

With such a configuration, it is possible to warm LPG even when it is sent at a low temperature. As a result, the LPG liquefied in the low temperature state can be sent to the LPG fuel tank under appropriate conditions regardless of the state of the supplied LPG.

Further, in a ship according to a third aspect of the present invention, in the first aspect or the second aspect, the booster pump includes: a first booster pump that boosts the pressure of the LPG sent from the fuel supply source; It may have a second boost pump that boosts the pressure of the LPG boosted by the boost pump.

With such a configuration, the LPG can be boosted in two steps. Therefore, the LPG can be further increased in pressure as needed, such as when the transfer pressure when sending the LPG to the LPG fuel tank is insufficient.

In the ship according to the fourth aspect of the present invention, in any one of the first to third aspects, the LPG fuel tank is a first LPG fuel tank and a second LPG fuel connected to the fuel line. The fuel line may have a tank, and the fuel line may send the LPG boosted by the booster pump to the first LPG fuel tank and the second LPG fuel tank, respectively.

With such a configuration, even if one of the first LPG fuel tank and the second LPG fuel tank fails and LPG cannot be supplied to the drive unit, the first LPG fuel tank and the LPG is supplied to the drive unit from the other of the two LPG fuel tanks. Therefore, LPG can be stably supplied to the drive unit.

In the ship according to the fifth aspect of the present invention, in the fourth aspect, the LPG stored in the first LPG fuel tank is sent to the booster pump, and the first recovery line is stored in the second LPG fuel tank. And a second recovery line for sending the LPG thus generated to the booster pump.

With such a configuration, the LPG stored in the first LPG fuel tank and the second LPG fuel tank can be taken out and sent to the booster pump. As a result, even if the LPG cannot be sent to the drive unit from either the first LPG fuel tank or the second LPG fuel tank due to a failure or the like, the LPG stored inside can be sent to the drive unit without wasting it. ..

Further, in a ship according to a sixth aspect of the present invention, in any one of the first to fifth aspects, the fuel line is connected to the fuel line on the LPG fuel tank side with respect to the booster pump, A drive unit bypass line for supplying at least a part of the LPG in the drive unit to the drive unit may be provided.

With such a configuration, the LPG boosted by the booster pump can be directly sent to the drive unit. Therefore, the operation of the ship can be maintained in an emergency when the LPG stored for the operation of the ship cannot be supplied to the drive unit.

According to the present invention, LPG for fuel can be pressurized and stored regardless of the state of LPG at the fuel supply source.

It is a side view showing the whole composition of the ship concerning the embodiment of the present invention. It is a schematic diagram explaining the LPG supply system which concerns on 1st embodiment of this invention. It is a schematic diagram explaining the LPG supply system which concerns on 2nd embodiment of this invention.

<<First embodiment>>
Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 and 2.
The ship 1 of the present embodiment is an LPG carrier that carries LPG. In order to carry a larger amount of LPG, this ship 1 can be stored in the cargo tank 50 in a state in which LPG is cooled and liquefied to reduce its volume. As shown in FIGS. 1 and 2, the ship 1 of the present embodiment includes a hull 10, an upper structure 20, an LPG fuel tank 30, a drive unit 40, a cargo tank 50, and an LPG supply system 60. ing.

As shown in FIG. 1, the hull 10 has a hold 11 and an engine area 12 therein.
The hold 11 is an area in which a cargo to be transported is mounted. The hold 11 is formed within a range of a predetermined length in the bow-stern direction FR from the front portion 10a to the rear portion 10b of the hull 10. The hold 11 of the present embodiment is a space that accommodates a cargo tank 50 that stores liquefied LPG inside. A plurality of holds 11 are arranged side by side in a row in the bow-stern direction FR. The holds 11 adjacent to each other in the bow-stern direction FR are partitioned in the bow-stern direction FR by a partition wall (not shown). The hold 11 in this embodiment is formed below a later-described upper deck 15 of the hull 10.

The engine area 12 is an area that accommodates the drive unit 40 that is a main engine such as an engine. The engine area 12 is provided closer to the rear portion 10b than the center of the hull 10 in the bow direction. In this embodiment, the engine section 12 is arranged adjacent to the hold 11 and behind the hold 11 in the bow-stern direction FR.

The hull 10 includes an upper deck 15 on the upper portion of the hold 11. The upper deck 15 of the hull 10 in this embodiment is the uppermost deck of all decks of the hull 10.

The upper structure 20 mainly forms a residential area. The upper structure 20 is provided on the upper deck 15 of the hull 10. The upper structure 20 is provided immediately above the engine section 12 arranged in the rear portion 10b of the hull 10.

The cargo tank 50 stores therein the natural gas to be transported. The cargo tank 50 of this embodiment stores LPG. That is, the LPG in the cargo tank 50 of this embodiment is a cargo to be transported. The cargo tank 50 is a storage tank that stores LPG that has been liquefied in a low temperature and normal pressure state. A heat insulating material is attached to the outer surface of the cargo tank 50. The cargo tank 50 is internally provided with a cargo pump 51 (see FIG. 2) for pumping the stored LPG. The cargo pump 51 boosts the pressure of the LPG stored in the cargo tank 50.

The LPG fuel tank 30 is provided on the hull 10. The LPG fuel tank 30 is a storage tank that stores LPG liquefied under normal temperature and pressure. The LPG fuel tank 30 stores the LPG supplied to the drive unit 40. The LPG fuel tank 30 of the present embodiment is arranged on the upper deck 15. The LPG fuel tank 30 is provided directly above the cargo tank 50 in the vicinity of the center of the bow-stern direction FR. The LPG fuel tank 30 has, for example, a cylindrical shape. The LPG fuel tank 30 stores the LPG supplied from the LPG storage facility (fuel supply source) 2 outside the hull 10. The LPG fuel tank 30 is internally provided with a transfer pump 31 (see FIG. 2) for pumping the stored LPG. The transfer pump 31 boosts the pressure of the LPG stored in the LPG fuel tank 30.

The drive unit 40 is driven by using the LPG stored in the LPG fuel tank 30 as fuel. The drive unit 40 is a main engine or a power generation engine in the ship 1. In the present embodiment, as the drive unit 40, a main engine that rotationally drives the screw 14 provided outside the rear portion 10b of the hull 10 is taken as an example. The drive unit 40 is housed in the engine area 12. The drive unit 40 applies a propulsive force to the boat 1 by rotating the screw 14.

The LPG supply system 60 sends the LPG from the LPG storage facility 2 to the cargo tank 50. Further, the LPG supply system 60 sends the LPG from the cargo tank 50 to the destination LPG storage facility 2. Further, the LPG supply system 60 sends the LPG from the LPG storage facility 2 to the LPG fuel tank 30. As shown in FIG. 2, the LPG supply system 60 of the present embodiment includes a fuel line 61, a cargo line 62, a high pressure unloading line 63, a booster pump 64, and a heating unit 69.

The fuel line 61 is connectable to the LPG storage facility 2 outside the hull 10. The fuel line 61 sends LPG from the LPG storage facility 2 to the LPG fuel tank 30. The fuel line 61 is provided on the hull 10. The fuel line 61 of the present embodiment is composed of a plurality of pipes described later.

The cargo line 62 can be connected to the LPG storage facility 2. The cargo line 62 circulates LPG between the LPG storage facility 2 and the cargo tank 50. The cargo line 62 is provided on the hull 10. The cargo line 62 of the present embodiment is composed of a plurality of pipes described later.

The high-pressure unloading line 63 can be connected to the LPG storage facility 2. The high-pressure unloading line 63 puts the LPG in the cargo tank 50 into a high-pressure state and sends it to the LPG storage facility 2. The high-pressure unloading line 63 is provided on the hull 10. The high-pressure unloading line 63 of this embodiment is composed of a plurality of pipes described later.

The booster pump 64 boosts the pressure of the sent LPG and sends it out. The booster pump 64 of the present embodiment boosts the pressure of the LPG sent to the LPG fuel tank 30 or the LPG storage facility 2. The booster pump 64 is provided in the middle of the fuel line 61 and the high pressure unloading line 63. The boost pump 64 boosts the pressure of the LPG to a pressure at which it can be liquefied at room temperature. The booster pump 64 is provided on the hull 10. The boost pump 64 of this embodiment includes a first boost pump 641 and a second boost pump 642. The first boost pump 641 and the second boost pump 642 are pumps having the same performance.

The heating unit 69 heats the LPG boosted by the boost pump 64. The heating unit 69 heats the low temperature LPG to room temperature (0° C. to 20° C.). The heating unit 69 of the present embodiment heats the LPG sent to the LPG fuel tank 30 and the LPG storage facility 2. The heating unit 69 heats the LPG using seawater. At this time, the seawater used may be preheated with another heat source. Other heat sources used include, for example, steam. The heating unit 69 is provided in the middle of the fuel line 61 and the high pressure unloading line 63. The heating unit 69 is provided on the hull 10.

The LPG fuel tank 30, the drive unit 40, the booster pump 64, the heating unit 69, and the cargo tank 50 of the present embodiment are connected by pipes. The LPG supply system 60 of this embodiment includes a first pipe 101, a second pipe 102, a third pipe 103, a fourth pipe 104, a fifth pipe 105, a sixth pipe 106, and a seventh pipe 107. And an eighth pipe 108, a ninth pipe 109, a tenth pipe 110, and an eleventh pipe 111.

The first pipe 101 is a part of a line that sends the LPG supplied from the LPG storage facility 2 to the cargo tank 50. The first pipe 101 is also a part of a line that sends the LPG supplied from the cargo tank 50 to the LPG storage facility 2. One end of the first pipe 101 can be connected to and disconnected from the LPG storage facility 2. Therefore, the first pipe 101 is attachable to and detachable from the LPG storage facility 2. The other end of the first pipe 101 is connected to the cargo tank 50. The other end of the first pipe 101 of the present embodiment is connected to the inside of the cargo tank 50. The first pipe 101 is provided on the hull 10. The first pipe 101 of the present embodiment has a first fuel supply source side valve 101a and a first cargo tank side valve 101b. The first fuel supply source side valve 101a is provided at a position closer to the LPG storage facility 2 than the first cargo tank side valve 101b. The first fuel supply source side valve 101a and the first cargo tank side valve 101b allow LPG to flow in the first pipe 101 when opened, and flow LPG in the first pipe 101 when closed. Impossible.

The second pipe 102 is a part of a line for sending the LPG stored in the cargo tank 50 to the booster pump 64. One end of the second pipe 102 is connected to the first pipe 101. One end of the second pipe 102 of the present embodiment is connected to the first pipe 101 between the first fuel supply source side valve 101a and the first cargo tank side valve 101b. The other end of the second pipe 102 is connected to the cargo tank 50. The other end of the second pipe 102 of the present embodiment is connected to the cargo pump 51 in the cargo tank 50. The second pipe 102 is provided on the hull 10. The second pipe 102 of the present embodiment has a second valve 102a. The second valve 102a is provided in the middle of the second pipe 102. The second valve 102a allows the LPG to flow in the second pipe 102 when opened, and disables the LPG in the second pipe 102 when closed.

The third pipe 103 is a part of a line for sending the LPG supplied from the LPG storage facility 2 or the LPG stored in the cargo tank 50 to the booster pump 64. One end of the third pipe 103 is connected to the first pipe 101. One end of the third pipe 103 of the present embodiment is connected to the first pipe 101 between the first fuel supply source side valve 101a and the LPG storage facility 2. The other end of the third pipe 103 is connected to the boost pump 64. The other end of the third pipe 103 of the present embodiment is connected to the first booster pump 641. The third pipe 103 is provided on the hull 10. The third pipe 103 of the present embodiment has a third fuel supply valve 103a and a third pump side valve 103b. The third fuel supply source valve 103a is provided in the middle of the third pipe 103. The third fuel supply valve 103a and the third pump side valve 103b are opened to allow the LPG to flow in the third pipe 103, and are closed to prevent the LPG from flowing in the third pipe 103. To do.

The fourth pipe 104 is a part of a line for sending the LPG stored in the cargo tank 50 or the LPG supplied from the LPG storage facility 2 to the booster pump 64. One end of the fourth pipe 104 is connected to the boost pump 64. One end of the fourth pipe 104 of the present embodiment is connected to the second boost pump 642. The other end of the fourth pipe 104 is connected to the first pipe 101. The other end of the fourth pipe 104 of the present embodiment is connected to the first pipe 101 between the connection position between the first pipe 101 and the second pipe 102 and the first fuel supply source side valve 101a. The fourth pipe 104 is provided on the hull 10. The fourth pipe 104 of the present embodiment has a fourth valve 104a. The fourth valve 104a is provided in the middle of the fourth pipe 104. The fourth valve 104a allows the LPG to flow in the fourth pipe 104 when opened, and disables the LPG in the fourth pipe 104 when closed.

The fifth pipe 105 is a part of a line for sending the LPG stored in the cargo tank 50 or the LPG supplied from the LPG storage facility 2 to the booster pump 64. One end of the fifth pipe 105 is connected to the third pipe 103. One end of the fifth pipe 105 of the present embodiment is connected to the third pipe 103 between the third fuel supply source valve 103a and the third pump side valve 103b. The other end of the fifth pipe 105 is connected to the fourth pipe 104. The other end of the fifth pipe 105 of the present embodiment is connected to the fourth pipe 104 between the connection position of the first pipe 101 and the fourth pipe 104 and the fourth valve 104a. The fifth pipe 105 is provided on the hull 10. The fifth pipe 105 of the present embodiment has a fifth valve 105a. The fifth valve 105a is provided in the middle of the fifth pipe 105. The fifth valve 105a allows the LPG to flow in the fifth pipe 105 when opened, and makes the LPG unable to flow in the fifth pipe 105 when closed.

The sixth pipe 106 is a part of a line that sends the LPG boosted by the booster pump 64 to the heating unit 69. One end of the sixth pipe 106 is connected to the heating unit 69. The other end of the sixth pipe 106 is connected to the booster pump 64. The other end of the sixth pipe 106 of the present embodiment is connected to the first boost pump 641. The sixth pipe 106 is provided on the hull 10. The sixth pipe 106 of the present embodiment has a sixth valve 106a. The sixth valve 106a is provided in the middle of the sixth pipe 106. The sixth valve 106a allows the LPG to flow in the sixth pipe 106 when opened, and makes the LPG unable to flow in the sixth pipe 106 when closed.

The seventh pipe 107 is a part of a line that sends the LPG boosted by the booster pump 64 to the heating unit 69. One end of the seventh pipe 107 is connected to the sixth pipe 106. One end of the seventh pipe 107 of the present embodiment is connected to the sixth pipe 106 between the sixth valve 106a and the heating unit 69. The other end of the seventh pipe 107 is connected to the boost pump 64. The other end of the seventh pipe 107 of the present embodiment is connected to the second boost pump 642. The seventh pipe 107 is provided on the hull 10. The seventh pipe 107 of this embodiment has a seventh valve 107a. The seventh valve 107a is provided in the middle of the seventh pipe 107. The seventh valve 107a allows the LPG to flow in the seventh pipe 107 when opened, and disables the LPG in the seventh pipe 107 when closed.

The eighth pipe 108 is a part of a line that sends the LPG boosted by the first boost pump 641 to the second boost pump 642. One end of the eighth pipe 108 is connected to the sixth pipe 106. One end of the eighth pipe 108 of the present embodiment is connected to the sixth pipe 106 between the sixth valve 106a and the first boost pump 641. The other end of the eighth pipe 108 is connected to the fourth pipe 104. The other end of the eighth pipe 108 of the present embodiment is connected to the fourth pipe 104 between the fourth valve 104a and the second boost pump 642. The eighth pipe 108 is provided on the hull 10. The eighth pipe 108 of the present embodiment has an eighth valve 108a. The eighth valve 108a is provided in the middle of the eighth pipe 108. The eighth valve 108a allows the LPG to flow in the eighth pipe 108 when opened, and disables the LPG in the eighth pipe 108 when closed.

The ninth pipe 109 is a part of a line that sends the LPG that has passed through the heating unit 69 to the LPG fuel tank 30. One end of the ninth pipe 109 is connected to the LPG fuel tank 30. The other end of the ninth pipe 109 is connected to the heating unit 69. The ninth pipe 109 is provided on the hull 10. The ninth pipe 109 of this embodiment has a ninth valve 109a. The ninth valve 109a is provided in the middle of the ninth pipe 109. The ninth valve 109a allows the LPG to flow in the ninth pipe 109 when opened, and makes the LPG unable to flow in the ninth pipe 109 when closed.

The tenth pipe 110 is a part of a line that sends the LPG that has passed through the heating unit 69 to the LPG storage facility 2. One end of the tenth pipe 110 can be connected to and disconnected from the LPG storage facility 2. Therefore, the tenth pipe 110 can be attached to and detached from the LPG storage facility 2. The other end of the tenth pipe 110 is connected to the ninth pipe 109. The other end of the tenth pipe 110 of the present embodiment is connected to the ninth pipe 109 between the ninth valve 109a and the heating unit 69. The tenth pipe 110 is provided on the hull 10. The tenth pipe 110 of the present embodiment has a tenth valve 110a. The tenth valve 110a allows the LPG to flow in the tenth pipe 110 when opened, and makes the LPG unable to flow in the tenth pipe 110 when closed.

The eleventh pipe 111 is a part of a line that sends the LPG stored in the LPG fuel tank 30 to the drive unit 40. One end of the eleventh pipe 111 is connected to the drive unit 40. The other end of the eleventh pipe 111 is connected to the LPG fuel tank 30. The other end of the eleventh pipe 111 of the present embodiment is connected to the transfer pump 31 in the LPG fuel tank 30. The eleventh pipe 111 is provided on the hull 10.

Therefore, the fuel line 61 of the present embodiment includes the first pipe 101, the third pipe 103, the sixth pipe 106, the seventh pipe 107, the eighth pipe 108, and the ninth pipe 109. The cargo line 62 of the present embodiment is configured by the first pipe 101. The high-pressure unloading line 63 of this embodiment includes the first pipe 101, the second pipe 102, the third pipe 103, the fourth pipe 104, the fifth pipe 105, the sixth pipe 106, the seventh pipe 107, and the eighth pipe 108. , The ninth pipe 109, and the tenth pipe 110.

In the ship 1 of the present embodiment, when loading LPG from the LPG storage facility 2 to the LPG fuel tank 30, the first pipe 101 is connected to the LPG storage facility 2. As a result, the fuel line 61 is connected to the LPG storage facility 2. Through the first pipe 101 connected to the LPG storage facility 2, the LPG that has been liquefied in the LPG storage facility 2 at a low temperature and normal pressure is supplied to the fuel line 61. The LPG flows through the first pipe 101 and the third pipe 103 in this order and is sent to the first boost pump 641. The LPG is boosted by the first boost pump 641. The LPG boosted by the first booster pump 641 flows to the second booster pump 642 in the order of the sixth pipe 106, the eighth pipe 108, and the fourth pipe 104. The LPG is further boosted by the second boost pump 642. In the present embodiment, the first boost pump 641 and the second boost pump 642 boost the pressure in two steps, so that the LPG is boosted to a pressure at which it can be liquefied at room temperature. The LPG boosted by the second boost pump 642 flows in the order of the seventh pipe 107 and the sixth pipe 106 and is sent to the heating unit 69. The LPG is heated to about room temperature by the heating unit 69. The LPG that has passed through the heating unit 69 flows through the ninth pipe 109 and is sent to the LPG fuel tank 30. As a result, the LPG liquefied at room temperature and high pressure is stored in the LPG fuel tank 30. The LPG stored in the LPG fuel tank 30 is sent to the drive unit 40 via the eleventh pipe 111 when the ship 1 is in operation. After that, the LPG is used by the drive unit 40 and used for operating the ship 1.

Further, when loading LPG from the LPG storage facility 2 into the cargo tank 50, the first pipe 101 is connected to the LPG storage facility 2. As a result, the cargo line 62 is connected to the LPG storage facility 2. Through the first pipe 101 connected to the LPG storage facility 2, the LPG stored in the LPG storage facility 2 at a low temperature and normal pressure is supplied to the cargo line 62. The LPG flows through the first pipe 101 and is sent to the cargo tank 50. As a result, the LPG liquefied in the low temperature and normal pressure state is stored in the cargo tank 50. The LPG stored in the cargo tank 50 is transported to the destination as a product.

Further, when the LPG stored in the cargo tank 50 is sent to the LPG storage facility 2, if the LPG storage facility 2 can accept the liquefied LPG in the low temperature and high pressure state, the first pipe 101 is connected to the LPG storage facility 2. Connected to. As a result, the cargo line 62 is connected to the LPG storage facility 2. The LPG in the cargo tank 50 is pressure-fed via the cargo pump 51 in the cargo tank 50. The LPG boosted by the cargo pump 51 flows in the order of the second pipe 102 and the first pipe 101 and is sent to the LPG storage facility 2.

When the LPG stored in the cargo tank 50 is sent to the LPG storage facility 2 and the LPG storage facility 2 cannot accept the liquefied LPG in the low temperature and high pressure state, the tenth pipe 110 causes the LPG storage facility to operate. Connected to 2. As a result, the high pressure unloading line 63 is connected to the LPG storage facility 2. The LPG in the cargo tank 50 is pressure-fed via the cargo pump 51 in the cargo tank 50. The LPG boosted by the cargo pump 51 flows to the first boost pump 641 in the order of the second pipe 102, the first pipe 101, the fourth pipe 104, the fifth pipe 105, and the third pipe 103. The LPG is boosted by the first boost pump 641. The LPG boosted by the first booster pump 641 flows to the second booster pump 642 in the order of the sixth pipe 106, the eighth pipe 108, and the fourth pipe 104. The LPG is further boosted by the second boost pump 642. The LPG boosted by the second boost pump 642 flows in the order of the seventh pipe 107 and the sixth pipe 106 and is sent to the heating unit 69. The LPG is heated to about room temperature by the heating unit 69. The LPG that has passed through the heating unit 69 flows to the LPG storage facility 2 in the order of the ninth pipe 109 and the tenth pipe 110.

In the present embodiment, the LPG boosted by the first boost pump 641 is further boosted by the second boost pump 642, but it is not limited to boosting the LPG in multiple stages in this way. When the first boost pump 641 alone can sufficiently boost LPG, the second boost pump 642 does not have to boost LPG. In this case, the LPG boosted by the first boost pump 641 may flow through the sixth pipe 106 and be supplied to the heating unit 69. If the second boost pump 642 alone can sufficiently boost the LPG, the LPG may be directly sent to the second boost pump 642 without passing through the first boost pump 641. In this case, the LPG is directly sent to the second booster pump 642 in the order of the second pipe 102, the first pipe 101, and the fourth pipe 104.

Further, in the present embodiment, the LPG is heated when passing through the heating unit 69, but the present invention is not limited to such a configuration. Therefore, when it is not necessary to heat the LPG, the LPG may be sent without being heated when passing through the heating unit 69.

According to the ship 1 as described above, the LPG supplied from the LPG storage facility 2 is pressurized by the first boost pump 641 and the second boost pump 642. Therefore, even if the LPG supplied from the LPG storage facility 2 is liquefied in a low temperature and normal pressure state, the LPG is pressurized and sent to the LPG fuel tank 30. Therefore, the LPG can be pressurized and sent to the LPG fuel tank 30 regardless of the state of the LPG in the LPG storage facility 2. As a result, the LPG can be pressurized and stored in the LPG fuel tank 30 regardless of the state of the LPG in the LPG storage facility 2.

Further, since the LPG whose pressure has been boosted by the booster pump 64 is heated by the heating unit 69, even if low-temperature LPG is sent, it can be warmed and brought to a normal temperature state. As a result, the LPG liquefied at room temperature and high pressure can be sent to the LPG fuel tank 30 with high accuracy under appropriate conditions, regardless of the state of the LPG supplied.

Further, in the present embodiment, the boost pump 64 has the first boost pump 641 and the second boost pump 642 that further boosts the pressure of the LPG after being boosted by the first boost pump 641. The LPG can be boosted in stages. Therefore, the LPG can be further increased in pressure as needed, such as when the transfer pressure for sending LPG to the LPG fuel tank 30 or the transfer pressure for sending LPG to the LPG storage facility 2 is insufficient. Therefore, a margin can be given to the pressure range when the LPG is boosted.

Further, the LPG stored in the cargo tank 50 and the LPG stored in the LPG fuel tank 30 necessary for operating the ship 1 can be transferred using the same booster pump 64 and the heating unit 69. Therefore, the booster pump 64 and the heating unit 69 can be shared. Specifically, in an LPG carrier that stores LPG in a cargo tank 50 as a transportation target, when it is difficult to receive LPG liquefied under low temperature and normal pressure conditions at the destination equipment, LPG liquefied under normal temperature and high pressure conditions In many cases, a booster pump and a heater are provided for the purpose. In this embodiment, this booster pump is commonly used as the booster pump 64 for boosting the pressure of the LPG sent to the LPG fuel tank 30. As a result, the cost and space for newly installing equipment for boosting and sending LPG to the LPG fuel tank 30 can be suppressed. Similarly, by using the heater as the heating unit 69, the cost and space for newly installing equipment for heating and sending LPG to the LPG fuel tank 30 can be suppressed. Therefore, it is possible to send the liquefied LPG to the LPG fuel tank 30 at room temperature and high pressure while suppressing the cost and space for newly installing the equipment.

<<Second embodiment>>
Next, a second embodiment of the ship of the present invention will be described with reference to FIG. The ship shown in the second embodiment is different from the first embodiment in the LPG fuel tank and the LPG supply system. Therefore, in the description of the second embodiment, the same parts as those in the first embodiment will be designated by the same reference numerals, and duplicate description will be omitted.

As shown in FIG. 3, in the ship 1 of the second embodiment, the LPG fuel tank 30A is composed of a plurality of tanks. Specifically, the LPG fuel tank 30A of the second embodiment has a first LPG fuel tank 35 and a second LPG fuel tank 36. The first LPG fuel tank 35 and the second LPG fuel tank 36 are tanks having the same storage conditions. Each of the first LPG fuel tank 35 and the second LPG fuel tank 36 of the present embodiment is capable of storing liquefied LPG at room temperature and high pressure. The first LPG fuel tank 35 and the second LPG fuel tank 36 are provided with transfer pumps 31 inside.

The LPG supply system 60A of the second embodiment includes a fuel line 61A, a cargo line 62, a high pressure unloading line 63, a booster pump 64, a heating unit 69, a first recovery line 65, and a second recovery line 66. And a drive unit bypass line 67.

In the fuel line 61A of the second embodiment, the LPG sent from the LPG storage facility 2 is boosted by the boost pump 64 and sent to the first LPG fuel tank 35 and the second LPG fuel tank 36, respectively.

The first recovery line 65 sends the LPG stored in the first LPG fuel tank 35 to the booster pump 64. The first recovery line 65 of the present embodiment sends the LPG in the first LPG fuel tank 35 to the second boost pump 642.

The second recovery line 66 sends the LPG stored in the second LPG fuel tank 36 to the booster pump 64. The second recovery line 66 of the present embodiment sends the LPG in the first LPG fuel tank 35 to the second boost pump 642.

The drive part bypass line 67 is connected to the fuel line 61A on the LPG fuel tank 30A side of the booster pump 64. The drive part bypass line 67 of the present embodiment is connected to the fuel line 61A on the LPG fuel tank 30A side of the heating part 69. The drive part bypass line 67 supplies at least a part of the LPG in the fuel line 61A to the drive part 40. Therefore, the drive unit bypass line 67 sends the LPG boosted by the booster pump 64 to the drive unit 40 without passing through the LPG fuel tank 30A.

The LPG supply system 60A of the second embodiment includes a twelfth pipe 112, a thirteenth pipe 113, a fourteenth pipe 114, and a fifteenth pipe in addition to the first pipe 101 to the eleventh pipe 111. 115 and sixteenth piping 116.

The twelfth pipe 112 is a part of a line that sends the LPG that has passed through the heating unit 69 to the second LPG fuel tank 36. The twelfth pipe 112 has one end connected to the second LPG fuel tank 36. The other end of the twelfth pipe 112 is connected to the ninth pipe 109. The ninth pipe 109 of the second embodiment connects the first LPG fuel tank 35 and the heating unit 69. The other end of the twelfth pipe 112 of the present embodiment is connected to the ninth pipe 109 between the ninth valve 109a and the heating unit 69. The twelfth pipe 112 is provided on the hull 10. The twelfth pipe 112 of this embodiment has a twelfth valve 112a. The twelfth valve 112a allows the LPG to flow in the twelfth pipe 112 when opened, and disables the LPG in the twelfth pipe 112 when closed.

The thirteenth pipe 113 is a part of a line for sending the LPG stored in the second LPG fuel tank 36 to the drive unit 40. One end of the thirteenth pipe 113 is connected to the eleventh pipe 111. The eleventh pipe 111 of the second embodiment connects the first LPG fuel tank 35 and the drive unit 40. The other end of the thirteenth pipe 113 is connected to the second LPG fuel tank 36. The other end of the thirteenth pipe 113 of the present embodiment is connected to the transfer pump 31 in the second LPG fuel tank 36. The thirteenth pipe 113 is provided on the hull 10.

The fourteenth pipe 114 is a part of a line that sends the LPG inside the first LPG fuel tank 35 to the second boost pump 642. One end of the fourteenth pipe 114 is connected to the bottom of the first LPG fuel tank 35. The other end of the fourteenth pipe 114 is connected to the fourth pipe 104. The other end of the fourteenth pipe 114 of the present embodiment is connected to the fourth pipe 104 at the same position as the position where the fifth pipe 105 is connected. The fourteenth pipe 114 is provided on the hull 10. The 14th piping 114 of this embodiment has the 14th valve 114a. The fourteenth valve 114a allows the LPG to flow in the fourteenth pipe 114 when opened, and disables the LPG in the fourteenth pipe 114 when closed.

The fifteenth pipe 115 is a part of a line that sends the LPG inside the second LPG fuel tank 36 to the second boost pump 642. One end of the fifteenth pipe 115 is connected to the bottom of the second LPG fuel tank 36. The other end of the fifteenth pipe 115 is connected to the fourteenth pipe 114. The other end of the fifteenth pipe 115 of the present embodiment is connected to the fourteenth pipe 114 between the position where the fourth pipe 104 is connected and the first LPG fuel tank 35. The fifteenth pipe 115 is provided on the hull 10. The fifteenth pipe 115 of the present embodiment has a fifteenth valve 115a. The fifteenth valve 115a allows the LPG to flow in the fifteenth pipe 115 when opened, and makes the LPG unable to flow in the fifteenth pipe 115 when closed.

The sixteenth pipe 116 is a part of a line that sends the LPG that has passed through the heating unit 69 to the drive unit 40. One end of the sixteenth pipe 116 is connected to the ninth pipe 109. One end of the sixteenth pipe 116 of the present embodiment is connected to the ninth pipe 109 between the position where the twelfth pipe 112 is connected and the heating unit 69. The other end of the sixteenth pipe 116 is connected to the eleventh pipe 111. The other end of the sixteenth pipe 116 of the present embodiment is connected to the eleventh pipe 111 between the position where the thirteenth pipe 113 is connected and the drive unit 40. The sixteenth pipe 116 is provided on the hull 10. The sixteenth pipe 116 of the present embodiment has a sixteenth valve 116a. The sixteenth valve 116a is provided in the middle of the sixteenth pipe 116. The sixteenth valve 116a allows the LPG to flow in the sixteenth pipe 116 when opened, and makes the LPG unable to flow in the sixteenth pipe 116 when closed.

Therefore, the fuel line 61A of the second embodiment includes the first pipe 101, the third pipe 103, the fourth pipe 104, the sixth pipe 106, the seventh pipe 107, the eighth pipe 108, the ninth pipe 109, and the tenth pipe. It is constituted by two pipes 112. The first recovery line 65 of the second embodiment is composed of the fourteenth pipe 114 and the fourth pipe 104. The second recovery line 66 of the second embodiment is composed of the fifteenth pipe 115, the fourteenth pipe 114, and the fourth pipe 104. The drive part bypass line 67 of the second embodiment is configured by the sixteenth pipe 116 and the eleventh pipe 111.

In the boat 1 of the second embodiment, when loading LPG from the LPG storage facility 2 into the LPG fuel tank 30A, LPG is supplied to both the first LPG fuel tank 35 and the second LPG fuel tank 36. Specifically, in the same flow as in the first embodiment, the LPG that has been pressurized and heated flows through the ninth pipe 109 and is sent to the first LPG fuel tank 35. Further, a part of the LPG flowing through the ninth pipe 109 is branched into the twelfth pipe 112 and sent to the second LPG fuel tank 36. As a result, the LPG liquefied in the room temperature and high pressure state is stored in the first LPG fuel tank 35 and the second LPG fuel tank 36, respectively. The LPG stored in the first LPG fuel tank 35 is sent to the drive unit 40 via the eleventh pipe 111 when the ship 1 is in operation. Further, the LPG stored in the second LPG fuel tank 36 flows to the drive unit 40 in the order of the thirteenth pipe 113 and the eleventh pipe 111 when the ship 1 is in operation. After that, the LPG is used by the drive unit 40 and used for operating the ship 1.

Here, when one of the first LPG fuel tank 35 and the second LPG fuel tank 36 fails, the first recovery line 65 or the second recovery line 66 is used. Specifically, a case where LPG cannot be supplied from the second LPG fuel tank 36 to the drive source will be described as an example.

For example, when the transfer pump 31 of the second LPG fuel tank 36 fails and the LPG stored inside cannot be sent to the drive unit 40, the second LPG is supplied to the fourth pipe 104 via the fifteenth pipe 115. The LPG in the fuel tank 36 is sent. The LPG sent to the fourth pipe 104 is sent to the second boost pump 642 to be boosted. The LPG boosted by the second boost pump 642 flows in the order of the seventh pipe 107 and the sixth pipe 106 and is sent to the heating unit 69. The LPG that has passed through the heating unit 69 flows through the ninth pipe 109 and is sent to the sixteenth pipe 116. The LPG sent to the sixteenth pipe 116 flows through the eleventh pipe 111 and is sent to the drive unit 40. Therefore, the LPG is sent to the drive unit 40 without passing through the first LPG fuel tank 35 and the second LPG fuel tank 36. As a result, even if the LPG cannot be directly sent from the second LPG fuel tank 36 to the drive unit 40, the LPG stored in the second LPG fuel tank 36 can be effectively used via the sixteenth pipe 116. it can. Similarly, even if the first LPG fuel tank 35 fails, the LPG stored in the first LPG fuel tank 35 can be effectively used via the sixteenth pipe 116.

When the second LPG fuel tank 36 fails, the LPG that has passed through the heating unit 69 is sent to the drive unit 40 after being sent from the ninth pipe 109 to the sixteenth pipe 116 to the first LPG fuel tank 35. You may send it. Therefore, the LPG sent from the second LPG fuel tank 36 may be sent to the drive unit 40 via the eleventh pipe 111 together with the LPG originally stored in the first LPG fuel tank 35.

If the first LPG fuel tank 35 and the second LPG fuel tank 36 both malfunction, the LPG in the cargo tank 50 is supplied to the drive unit 40. Specifically, when LPG cannot be sent from the first LPG fuel tank 35 and the second LPG fuel tank 36 to the drive unit 40, the LPG in the cargo tank 50 is passed through the cargo pump 51 in the cargo tank 50. Is pumped. The LPG boosted by the cargo pump 51 flows in the order of the second pipe 102, the first pipe 101, and the fourth pipe 104, and is sent to the second boost pump 642. The LPG is boosted by the second boost pump 642. The LPG boosted by the second boost pump 642 flows in the order of the seventh pipe 107 and the sixth pipe 106 and is sent to the heating unit 69. The LPG that has passed through the heating unit 69 flows to the drive unit 40 by flowing in the order of the ninth pipe 109, the sixteenth pipe 116, and the eleventh pipe 111.

According to the ship 1 as described above, the storage unit supplying the drive unit 40 with LPG includes the first LPG fuel tank 35 and the second LPG fuel tank 36. Therefore, even if one of the first LPG fuel tank 35 and the second LPG fuel tank 36 fails and LPG cannot be supplied to the drive unit 40, the first LPG fuel tank 35 and the second LPG fuel that have not failed LPG is supplied to the drive unit 40 from the other side of the tank 36. Therefore, the LPG can be stably supplied to the drive unit 40.

Further, the first LPG fuel tank 35 is connected to the second boost pump 642 via the first recovery line 65. Further, the second LPG fuel tank 36 is connected to the second boost pump 642 via the second recovery line 66. Therefore, the LPG stored in the first LPG fuel tank 35 and the second LPG fuel tank 36 can be taken out and sent to the second booster pump 642. The LPG sent to the second booster pump 642 is sent to the drive unit 40 via the tank that is not in failure in the first LPG fuel tank 35 and the second LPG fuel tank 36, or by the drive unit bypass line 67. It is sent to the drive unit 40 without passing through the first LPG fuel tank 35 and the second LPG fuel tank 36. As a result, even if the LPG cannot be sent to the drive unit 40 from either the first LPG fuel tank 35 or the second LPG fuel tank 36 due to a failure or the like, the LPG stored in the drive unit 40 is not wasted. Can be sent.

Further, a drive unit bypass line 67 capable of sending LPG to the drive unit 40 without interposing the first LPG fuel tank 35 and the second LPG fuel tank 36 is provided. Therefore, for example, when both the first LPG fuel tank 35 and the second LPG fuel tank 36 fail or the stored LPG is exhausted, the LPG boosted by the booster pump 64 is directly supplied to the drive unit 40. Can be sent. Therefore, when the LPG is stored in the cargo tank 50, the LPG in the cargo tank 50 can be supplied to the second boost pump 642 to supply the LPG to the drive unit 40. Therefore, the operation of the ship 1 can be maintained in an emergency when the LPG stored for the operation of the ship 1 cannot be supplied to the drive unit 40.

In the second embodiment, the configuration in which the first recovery line 65 and the second recovery line 66 send LPG to the second booster pump 642 has been described as an example, but the present invention is not limited to such a configuration. .. For example, the first recovery line 65 and the second recovery line 66 may send LPG to the first boost pump 641. In this case, the fourteenth pipe 114 and the fifteenth pipe 115 may be connected to the third pipe 103.

(Other modifications of the embodiment)
As described above, the embodiments of the present invention have been described in detail with reference to the drawings. However, each configuration and the combination thereof in each of the embodiments are examples, and addition and omission of the configurations are not departing from the scope of the present invention. , Substitutions, and other changes are possible. Also, the invention is not limited to the embodiments, but only by the claims.

The ship 1 in the present embodiment is not limited to a carrier ship that carries LPG as cargo. The vessel 1 may be a carrier vessel or a commercial vessel that transports natural gas such as LNG or another article as long as the vessel 1 uses LPG as a fuel used during operation.

Further, the structure, the number of installed cargo tanks, etc. of the cargo tank 50 are not limited in any way. Furthermore, if the cargo to be transported is other than liquefied gas, the structure of the hold 11 may be adapted to the cargo to be transported.

Further, the booster pump 64 is not limited to the configuration having only two pumps, that is, the first booster pump 641 and the second booster pump 642 as in the present embodiment. For example, the boost pump 64 may be configured to have three or more pumps like the third boost pump, or may be configured to have only one pump of the first boost pump 641.

Further, the LPG fuel tanks 30 and 30A have only one structure as in the first embodiment and only the first LPG fuel tank 35 and the second LPG fuel tank 36 as in the second embodiment. It is not limited to. For example, the LPG fuel tanks 30 and 30A may have three or more configurations so as to have a third LPG fuel tank.

The LPG storage facility 2 may be any facility that can supply LPG to the LPG fuel tank 30, and may be, for example, an LPG terminal (base), an LPG bunker ship, a tank truck, or another LPG carrier ship.

Further, the LPG supply systems 60 and 60A of the present embodiment are configured to be connected to one cargo tank 50, but the configuration is not limited to such a configuration. For example, the LPG supply systems 60 and 60A may be connected to the plurality of cargo tanks 50 in parallel.

DESCRIPTION OF SYMBOLS 1... Ship FR... Stern direction 10... Hull 10a... Front part 10b... Rear part 11... Hold 12... Engine area 14... Screw 15... Upper deck 20... Superstructure 30, 30A... LPG fuel tank 31... Transfer pump 40... Drive Part 50... Cargo tank 51... Cargo pump 60, 60A... LPG supply system 61, 61A... Fuel line 62... Cargo line 63... High pressure unloading line 64... Boost pump 641... First boost pump 642... Second boost pump 69... Heating unit 101... First pipe 101a... First fuel supply source side valve 101b... First cargo tank side valve 102... Second pipe 102a... Second valve 103... Third pipe 103a... Third fuel supply source valve 103b... Third pump side valve 104... Fourth pipe 104a... Fourth valve 105... Fifth pipe 105a... Fifth valve 106... Sixth pipe 106a... Sixth valve 107... Seventh pipe 107a... Seventh valve 108... Eighth pipe 108a ... 8th valve 109 ... 9th piping 109a ... 9th valve 110 ... 10th piping 110a ... 10th valve 111 ... 11th piping 35 ... 1st LPG fuel tank 36 ... 2nd LPG fuel tank 65 ... 1st recovery line 66... 2nd collection line 67... Drive part bypass line 112... 12th piping 112a... 12th valve 113... 13th piping 114... 14th piping 114a... 14th valve 115... 15th piping 115a... Fifteenth valve 116... Sixteenth piping 116a... Sixteenth valve 2... LPG storage facility (fuel supply source)

Claims (6)

The hull,
An LPG fuel tank provided on the hull for storing LPG liquefied under pressure;
A driving unit that is driven by using the LPG stored in the LPG fuel tank as fuel;
A fuel line connectable to a fuel supply source outside the hull and for sending the LPG sent from the fuel supply source to the LPG fuel tank;
A booster pump provided in the middle of the fuel line for boosting the pressure of the LPG sent from the fuel supply source;
A cargo tank provided in the hull for storing the liquefied LPG therein;
A cargo line connectable to the fuel supply source and supplying the LPG from the fuel supply source to the cargo tank;
A high pressure unloading line that is connectable to the fuel supply source and sends the LPG in the cargo tank to the fuel supply source;
Ship the booster pump is provided in the middle of the high-pressure unloading line, it boosts the LPG sent from the cargo tanks. The ship according to claim 1, further comprising a heating unit that is provided in the middle of the fuel line and that heats the LPG whose pressure is increased by the pressure increasing pump. The booster pump includes a first booster pump for boosting the LPG sent from the fuel supply source, and a second booster pump for boosting the LPG boosted by the first booster pump. The ship according to claim 2. The LPG fuel tank has a first LPG fuel tank and a second LPG fuel tank connected to the fuel line,
The fuel line is
The ship according to any one of claims 1 to 3, wherein the LPG boosted by the booster pump is sent to the first LPG fuel tank and the second LPG fuel tank, respectively. A first recovery line for sending the LPG stored in the first LPG fuel tank to the booster pump;
The 2nd collection line which sends the said LPG stored in the said 2nd LPG fuel tank to the said booster pump, The ship of Claim 4 provided. The drive unit bypass line, which is connected to the fuel line on the LPG fuel tank side of the booster pump and supplies at least a part of the LPG in the fuel line to the drive unit . The ship according to any one of items .

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