WO2020075642A1

WO2020075642A1 - Ship

Info

Publication number: WO2020075642A1
Application number: PCT/JP2019/039295
Authority: WO
Inventors: 泰史塚本; 健司津村; 田村　浩; 伸上田
Original assignee: 三菱造船株式会社
Priority date: 2018-10-10
Filing date: 2019-10-04
Publication date: 2020-04-16
Also published as: SG11202103581QA; CN112823119A; JP2020059397A; KR20230106715A; KR20210053985A; JP6942681B2

Abstract

This ship is provided with: a hull; a tank (3) provided to the hull, a liquefied gas (L) in liquid form being accommodated inside the tank (3); a liquid level detection unit (8) that detects the liquid level of the liquefied gas (L) inside the tank (3); and an information processing device (20) into which a value of the liquid level detected by the liquid level detection unit (8) is inputted. The information processing unit (20) has: a storage unit (23) that stores a highest-liquid-level setting value (Lm) for the tank (3), said value (Lm) being set for each of a plurality of types of liquefied gas (L) having different specific gravities; and an assessment unit (24) that assesses whether the value of the liquid level inputted from the liquid level detection unit (8) has reached the highest-liquid-level setting value (Lm) that corresponds to the type of the liquefied gas (L) accommodated inside the tank (3).

Description

Ship

This invention relates to a ship.
The present application claims priority to Japanese Patent Application No. 2018-192054 filed in Japan on October 10, 2018, the contents of which are incorporated herein by reference.

A ship that carries Liquefied Natural Gas (LNG), etc., has a hull and multiple tanks. These plurality of tanks are arranged side by side in the fore-and-aft direction of the hull, and each holds a load such as LNG.

For example, in Patent Document 1, multi-gas such as LNG, LPG (Liquid Petroleum Gas), ethane, and ethylene can be loaded and transported by the same liquefied gas transport ship, so that the tank has the largest liquid specific gravity. A structure having a structural strength that allows ethylene loading is disclosed.

JP, 2016-22931, A

By the way, ships are used for a long period of time, for example, over 20 years. On the other hand, ships such as those mentioned above are becoming larger in size with the times, and the fuel consumption rate during navigation is improving due to the progress of propulsion engines. For this reason, the existing existing vessels of the old type tend to have a low operating rate although they are still usable. In the case of a ship that carries LNG or the like, the tank is highly useful because it is made of a material such as an aluminum alloy that does not easily corrode. Therefore, there is a demand for effective use of existing vessels if the hull and propulsion mechanism are available.

However, the ship manufactured to transport LNG has its structural strength set according to the specific gravity of LNG. When a liquefied gas having a specific gravity larger than that of LNG is loaded, the weight of the liquefied gas in a state where it is fully loaded in the tank is larger than the weight when the LNG is fully loaded. Therefore, when a liquefied gas having a specific gravity larger than that of LNG is loaded, the structural strength of the tank may be insufficient. Therefore, if the configuration disclosed in Patent Document 1 is applied to an existing ship manufactured for transporting LNG, it is impossible to load liquefied gas having a specific gravity larger than that of LNG. That is, with the configuration disclosed in Patent Document 1, it is difficult to load another type of load having a larger specific gravity than the load assumed when setting the structural strength of the tank. .
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a ship that can accommodate and carry a load in a tank in an appropriate state regardless of the specific gravity of the load.

The present invention employs the following means in order to solve the above problems.
According to the first aspect of the present invention, a ship includes a hull, a tank provided on the hull and containing a liquid load, and a liquid level detection unit that detects a liquid level of the load in the tank. And an information processing device to which the value of the liquid level detected by the liquid level detection unit is input. The information processing device includes a storage unit that stores a maximum liquid level set value of the tank that is set for each of a plurality of types of the loads having different specific gravities, and a liquid level that is input from the liquid level detection unit. And a determination unit that determines whether or not the value of has reached the maximum liquid level set value corresponding to the type of the loaded object accommodated in the tank.

In this way, the maximum liquid level setting value of the tank is stored for each type of load stored in the tank. Whether the liquid level value of the load detected by the liquid level detection unit has reached the maximum liquid level setting value set by the determination unit according to the type of the load stored in the tank. To be judged. As a result, the liquid level of the load stored in the tank can be prevented from exceeding the maximum liquid level set value set according to the type of the load stored in the tank. Therefore, it is possible to prevent the load of the load accommodated in the tank from becoming excessively large even if the load having a high specific gravity is accommodated in the tank whose capacity and structural strength are set according to the load having a low specific gravity. You can

According to a second aspect of the present invention, in the storage unit according to the first aspect, the maximum liquid level set value set for each type of the loaded object is the maximum liquid level set value in the tank. The load of the load may be determined not to exceed the allowable load of the tank while the load is stored.
With this configuration, even if a load having a large specific gravity is accommodated in a tank having a capacity set according to a load having a small specific gravity, the load of the load accommodated in the tank is excessive. Can be suppressed.

According to the third aspect of the present invention, in the ship according to the first or second aspect, the full liquid in the tank is adjusted according to the load having the smallest specific gravity among the plurality of types of the loads loaded in the tank. The maximum liquid level set value of the other load having a specific gravity set to be smaller than that of the loaded product having the smallest specific gravity may be set to be lower than the full liquid level.
With this configuration, the load of the load accommodated in the tank becomes excessive even if the load having a large specific gravity is accommodated in the tank having the capacity set according to the load having a low specific gravity. Can be suppressed. That is, the load having the smallest specific gravity is stored in the tank until the full liquid level is reached, while the load having the large specific gravity is stored in the tank at a state less than the full liquid level.

According to a fourth aspect of the present invention, in the ship according to any one of the first to third aspects, the value of the liquid level input from the liquid level detection unit by the determination unit is in the tank. An information output unit that outputs predetermined information to the outside when it is determined that the maximum liquid level set value corresponding to the type of the loaded item has been reached may be further provided.
With such a configuration, it is possible to output information indicating that the load stored in the tank has reached the maximum liquid level set value set corresponding to the type of the load to the outside. it can. As a result, the operator who carries out the work of accommodating the load in the tank recognizes that the load has been stored up to the maximum liquid level setting value in the tank, and automatically stops the storage of the load in the tank. It becomes possible.

According to a fifth aspect of the present invention, in the ship according to any one of the first to fourth aspects, the vaporized component of the load is taken out from the tank and used as fuel for a propulsion engine provided in the hull. A fuel supply device for supplying the fuel, and a reliquefaction device for reliquefying the vaporized component of the other kind of the load different from the load supplied to the propulsion engine by the fuel supply device and returning it to the tank. It may be provided.
With this configuration, when the type of the load stored in the tank is such that the vaporized component can be used as fuel for the propulsion engine, the fuel supply device uses the vaporized component as fuel for the propulsion engine. Supply. Further, when the type of the load accommodated in the tank is a type that cannot be used as the fuel of the propulsion engine, the vaporized component can be reliquefied by the reliquefaction device and returned to the tank. As a result, the vaporized component can be appropriately processed according to the type of load.

According to the above vessel, it is possible to accommodate and carry the load in a tank in an appropriate state regardless of the specific gravity of the load.

It is a side view which shows the schematic structure of the existing ship in the ship of one Embodiment of this invention. It is sectional drawing which shows the structure of the tank provided in the said existing ship. It is sectional drawing which shows the structure of the tank in the ship manufactured using the said existing ship. It is a flowchart which shows the flow of the loading method of the liquefied gas to the tank in the said ship.

Hereinafter, a ship according to an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a side view showing a schematic configuration of an existing ship in the ship of this embodiment. FIG. 2 is a cross-sectional view showing the structure of the tank provided in the existing ship. FIG. 3 is a sectional view showing the structure of a tank in a ship manufactured using an existing ship.
As shown in FIG. 1, the existing ship 1 used for the ship 10 of this embodiment includes a hull 2 and a plurality of tanks 3. It has a pair of port sides 2s provided on both sides in the ship width direction and a ship bottom 2b. The hull 2 includes an upper deck 2t that is provided above the ship bottom 2b with a space therebetween. The hull 2 has an upper structure 2h that forms a living room or the like on the stern 2r side in the bow-stern direction Da. The hull 2 includes a cargo loading section (hold) 2k on the bow 2a side in the bow-stern direction Da with respect to the upper structure 2h. Further, inside the hull 2, an engine room including a main engine 4 for propelling the existing ship 1 is provided on the stern 2r side in the bow-stern direction Da.

The upper deck 2t is a fully exposed deck that is exposed to the outside, and is provided so as to cover the cargo loading section 2k above.

A plurality of tanks 3 are arranged in the cargo loading section 2k in the hull 2 in the bow-aft direction Da. The existing ship 1 illustrated in this embodiment includes five tanks 3 that are moss-type independent spherical tanks. The upper portions 3a of the tanks 3 are arranged above the upper deck 2t.
The plurality of tanks 3 contain a liquid liquefied gas (load) L. The existing ship 1 of this embodiment is an LNG carrier, and each tank 3 stores LNG. The tank 3 is formed of, for example, an aluminum alloy in order to ensure toughness in a low temperature atmosphere and corrosion resistance. In addition, the tank 3 has a load of LNG (= LNG Designed and manufactured with structural strength according to volume x specific gravity).

As shown in FIG. 2, each tank 3 is provided with a liquid level detection unit 8 that detects the liquid level of the liquefied gas L stored in the tank 3. The liquid level detection unit 8 is, for example, a radar-type level gauge, and by irradiating the liquid level of the liquefied gas L in the tank 3 with a radar having a predetermined frequency, the liquid level value of the liquefied gas L in the tank 3 To detect. The liquid level detection unit 8 is not limited to the radar type, but may use another type such as a capacitance type or a float type.
In the existing ship 1, the liquid level detector 8 detects the value of the LNG liquid level in the tank 3 to detect whether or not the LNG is loaded in the tank 3 up to the full liquid level Lx.

Further, the existing ship 1 includes a fuel supply device 7 that supplies boil-off gas as fuel for the main engine 4 when LNG stored in the tank 3 is vaporized in the tank 3 and boil-off gas (vaporized component) is generated. ing. The fuel supply device 7 supplies boil-off gas from each tank 3 to the main engine 4 (see FIG. 1) through a connecting pipe (not shown) that connects each tank 3 to the main engine 4.

Further, as shown in FIG. 1, the existing ship 1 is equipped with a cargo pump (not shown) for unloading the LNG in the tank 3, a manifold 9B and the like. The cargo pump is provided in the tank 3, and the manifold 9B is arranged on the upper deck 2t.

The ship 10 is manufactured by modifying the existing ship 1. The ship 10 is manufactured by mainly adding an information processing device 20 and a reliquefaction device 12 as shown in FIG. 3 to the existing ship 1. The ship 10 uses the hull 2 of the existing ship 1, the tank 3, the fuel supply device 7, the liquid level detection unit 8, the cargo pump (not shown), and the manifold 9B as they are. In the marine vessel 10, the tank 3 can accommodate not only LNG but also other types of liquefied gas (eg, butane, propane, ethane, ethylene, etc.). Specifically, the tank 3 can selectively store LNG having the smallest specific gravity and another type of liquefied gas L having a larger specific gravity than LNG. Here, the same type of liquefied gas L may be mounted in the plurality of tanks 3, or a plurality of types of liquefied gas L may be mounted in the plurality of tanks 3.

As shown in FIG. 3, the information processing device 20 is a computer device and functionally includes a processing unit 21, an input unit 22, a storage unit 23, a determination unit 24, and an information output unit 25. There is.

The processing unit 21 performs a process for appropriately managing the liquid level of the liquefied gas L stored in the tank 3 according to the type of the liquefied gas L stored in the tank 3 based on a predetermined computer program. To execute.

The input unit 22 receives input of identification information for identifying the type of the liquefied gas L stored in the tank 3 from the outside. The identification information can be input to the outside by, for example, the operator selecting the type of the liquefied gas L to be stored in the tank 3 with a switch or the like. Further, the identification information of the liquefied gas L to be transferred to the tank 3 may be input to the input unit 22 from the onshore storage facility side that stores the liquefied gas L to be loaded on the ship 10. Further, for example, the manifold 9B or the like is provided with a liquid type detection means (not shown) for detecting the specific gravity, components, etc. of the liquefied gas L sent to the tank 3, and the type of the liquefied gas L is automatically detected to input the input portion. 22 may be input.

The storage unit 23 stores the maximum liquid level set value Lm of the tank 3 set for each type of liquefied gas L. When the liquefied gas L stored in the tank 3 is LNG, the maximum liquid level set value Lm is the LNG full liquid level Lx set in the tank 3 since the existing ship 1. The maximum liquid level set value Lm is set according to the specific gravity of the liquefied gas L for each type of liquefied gas L. The maximum liquid level set value Lm is set so that the load of the liquefied gas L does not exceed the allowable load of the tank 3 when the liquefied gas L is contained in the tank 3 up to the maximum liquid level set value Lm. The allowable load of the tank 3 in the existing ship 1 is the liquefied gas L when LNG containing methane as a main component (specific gravity 0.47 to 0.48) is stored as the liquefied gas L up to the full liquid level Lx in the tank 3. It is set based on the weight of.

For example, the specific gravity of LNG is d0, and the volume of LNG when LNG is stored in the tank 3 up to the full liquid level Lx is V0. In this case, the volume V of the liquefied gas L having the specific gravity d, which is equal to the weight of the LNG having the volume V0, is as follows.
V = (d0 / d) × V0 (1)
From the above formula (1), when the specific gravity d of the liquefied gas L is larger than the specific gravity d0 of LNG (d> d0), the maximum volume Vm of the liquefied gas L stored in the tank 3 is
Vm ≦ V0
Becomes That is, when another type of liquefied gas L having a larger specific gravity d than LNG is stored in the tank 3, the maximum liquid level set value Lm of the liquefied gas L is larger than the full liquid level Lx when the LNG is stored in the tank 3. Is also low and will be set downward. Further, the maximum liquid level set value Lm is set for each type (for each specific gravity) of the liquefied gas L of a plurality of types having different specific gravities. That is, the storage unit 23 stores a plurality of types of maximum liquid level set values Lm according to the specific gravity of the liquefied gas L. Further, the maximum liquid level set value Lm is set to a lower position as the specific gravity of the liquefied gas L is larger.

The determination unit 24 sets the liquid level value of the liquefied gas L in the tank 3 input from the liquid level detection unit 8 to the maximum liquid level set value Lm corresponding to the type of the liquefied gas L stored in the tank 3. Determine whether or not

The information output unit 25 sets the maximum liquid level based on the determination result of the determination unit 24 so that the value of the liquid level of the liquefied gas L input from the liquid level detection unit 8 corresponds to the type of the liquefied gas L in the tank 3. When the value Lm is reached, predetermined information is output to the outside. The information output by the information output unit 25 to the outside includes, for example, an alarm sound for notifying the operator that the liquefied gas L has reached the maximum liquid level set value Lm, lighting of a lamp, and display of character information. . Upon recognizing these pieces of information, the operator stops the onshore cargo pump (not shown) and stops the delivery of the liquefied gas L to the tank 3 by the cargo pump (not shown). Further, as the information output by the information output unit 25 to the outside, when the liquefied gas L reaches the maximum liquid level set value Lm, the control system (ESDS: Emergency ShutDown System) is notified to the control system, There is one that closes the valve in the cargo piping on the ship to automatically stop the supply of the liquefied gas L to the tank 3.

The reliquefaction device 12 reliquefies the boil-off gas of the liquefied gas L generated in the tank 3 and returns it to the tank 3. In this embodiment, when LNG is stored in the tank 3 as the liquefied gas L, the boil-off gas of LNG can be supplied as the fuel of the main engine 4 by the fuel supply device 7. When the liquefied gas L other than LNG is stored in the tank 3, the boil-off gas of the liquefied gas L is reliquefied by the reliquefaction device 12 and returned to the tank 3. When LNG is stored in the tank 3, the boil-off gas of LNG may be reliquefied by the reliquefaction device 12 and returned to the tank 3.

The information processing device 20 can automatically control which of the fuel supply device 7 and the reliquefaction device 12 the boil-off gas of the liquefied gas L in the tank 3 is sent to. In this case, based on the information indicating the type of the liquefied gas L input to the input unit 22 of the information processing device 20, the processing unit 21 uses the boil-off gas of the liquefied gas L as the fuel when the liquefied gas L is LNG. A command is issued to send it to the supply device 7. If the liquefied gas L is any butane, propane, ethane, or ethylene other than LNG, based on the information indicating the type of the liquefied gas L input to the input unit 22 of the information processing device 20, The processing unit 21 issues a command to send the boil-off gas of L to the reliquefaction device 12.

Next, a method of loading the liquefied gas L on the tank 3 in the information processing apparatus 20 will be described.
FIG. 4 is a flow chart showing a flow of a method for loading liquefied gas in a tank in the ship.
As shown in FIG. 4, the method of loading the liquefied gas L on the tank 3 in the information processing apparatus 20 includes an identification information input step S1, a gas loading step S2, a liquid level detection step S3, and a liquid level determination step S4. , A determination result information output step S5, and a gas loading stop step S6.

First, in the identification information input step S1, the input unit 22 receives an input of identification information for identifying the type of the liquefied gas L stored in the tank 3 from the outside.

In the gas loading step S2, a cargo pump (not shown) is operated to load the liquefied gas L into the tank 3 from an external land-side storage facility or the like. The operation of the load pump (not shown) may be manually performed by an operator or may be automatically performed by the processing by the processing unit 21.

In the liquid level detecting step S3, the liquid level detecting unit 8 detects the liquid level of the liquefied gas L in the tank 3. The liquid level detection unit 8 outputs the numerical value of the detected liquid level to the processing unit 21.

In the liquid level determination step S4, in the determination unit 24, the value of the liquid level of the liquefied gas L in the tank 3 input from the liquid level detection unit 8 corresponds to the type of the liquefied gas L stored in the tank 3. It is determined whether or not the maximum liquid level set value Lm has been reached. The maximum liquid level set value Lm is stored in the storage unit 23. The processing unit 21 calls the maximum liquid level set value Lm stored in the storage unit 23 and notifies the determination unit 24 of it. The determination unit 24 compares the detected value of the liquid level in the liquid level detection unit 8 with the maximum liquid level set value Lm notified from the processing unit 21. The determination unit 24 notifies the processing unit 21 of information indicating the determination result.

In the liquid level determination step S4, when it is determined that the detected value of the liquid level in the liquid level detection unit 8 has not reached the maximum liquid level set value Lm (the determination result of the liquid level determination step S4 is “No”), The processing unit 21 returns to the liquid level detecting step S3 and repeats the liquid level detecting step S3 at every predetermined time.
When it is determined in the liquid level determination step S4 that the detected value of the liquid level in the liquid level detection unit 8 has reached the maximum liquid level set value Lm (the determination result of the liquid level determination step S4 is “Yes”), the determination is made. The process proceeds to the result information output step S5.
In the determination result information output step S5, the processing unit 21 notifies the information output unit 25 of information indicating that the detection value of the liquid level in the liquid level detection unit 8 has reached the maximum liquid level set value Lm. In response to the control command from the processing unit 21, the information output unit 25 notifies the outside of the information indicating that the liquid level detection value in the liquid level detection unit 8 has reached the maximum liquid level set value Lm. In the determination result information output step S5, when the external output of the information indicating that the detected value of the liquid level in the liquid level detection unit 8 has reached the maximum liquid level set value Lm is completed, the process proceeds to the gas loading stop step S6.

In the gas loading stop step S6, a loading pump (not shown) is stopped, and loading of the liquefied gas L from the external land-side storage facility or the like to the tank 3 is stopped. The load pump (not shown) may be stopped manually by an operator or automatically by the processing by the processing unit 21.

Therefore, according to the ship 10 of the above-described embodiment, the maximum liquid level set value Lm of the tank 3 is stored for each type of the liquefied gas L stored in the tank 3. The liquid level of the liquefied gas L stored in the tank 3 detected by the liquid level detection unit 8 is the highest set by the determination unit 24 in accordance with the type of the liquefied gas L stored in the tank 3. It is determined whether or not the liquid level set value Lm has been reached. Accordingly, the liquid level of the liquefied gas L stored in the tank 3 can be prevented from exceeding the maximum liquid level set value Lm set according to the type of the liquefied gas L stored in the tank 3. . Therefore, even if the liquefied gas L having a large specific gravity is stored in the tank 3 having a capacity set according to the liquefied gas L having a small specific gravity, the load of the liquefied gas L stored in the tank 3 becomes excessive. Can be suppressed.
As a result, regardless of the specific gravity of the liquefied gas L, the liquefied gas L can be accommodated and transported in the tank 3 in an appropriate state.

Further, the maximum liquid level set value Lm is defined so that the load of the liquefied gas L does not exceed the allowable load of the tank 3 in a state where the liquefied gas L is stored in the tank 3 up to the maximum liquid level set value Lm. As a result, even if the liquefied gas L having a large specific gravity is stored in the tank 3 having a capacity set according to the liquefied gas L having a small specific gravity, the load of the liquefied gas L stored in the tank 3 becomes excessive. Can be suppressed. Therefore, it is possible to effectively utilize the existing ship 1 including the tank 3 that accommodates LNG, and to mount the liquefied gas L having a specific gravity larger than that of LNG within a range that does not exceed the allowable load of the tank 3.

Further, the maximum liquid level set value Lm of the other liquefied gas L having a larger specific gravity than the liquefied gas L having the smallest specific gravity is set to be lower than the full liquid level Lx of the tank 3. That is, the liquefied gas L with the smallest specific gravity is stored in the tank 3 until the tank 3 reaches the full liquid level Lx, whereas the liquefied gas L with the large specific gravity is less than the full liquid level Lx in the tank 3. Accommodated in. With this configuration, even if the liquefied gas L having a large specific gravity is stored in the tank 3 having a volume set according to the liquefied gas L having a small specific gravity, the load of the liquefied gas L stored in the tank 3 is stored. Can be prevented from becoming excessive.

When the value of the liquid level input from the liquid level detection unit 8 reaches the maximum liquid level set value Lm corresponding to the type of the liquefied gas L in the tank 3 in the marine vessel 10 based on the determination result of the determination unit 24. An information output unit 25 that outputs predetermined information to the outside is further provided. With such a configuration, information indicating that the liquefied gas L stored in the tank 3 has reached the maximum liquid level set value Lm set corresponding to the type of the liquefied gas L is provided to the outside. Can be output. As a result, the operator who carries out the work of storing the liquefied gas L in the tank 3 recognizes that the liquefied gas L has been stored in the tank 3 up to the maximum liquid level set value Lm, and It is possible to stop the containment automatically.

The vessel 10 takes out the boil-off gas of the liquefied gas L from the tank 3 and supplies it as fuel for the main engine 4 provided in the hull 2, and the liquefied gas L supplied to the main engine 4 by the fuel supply apparatus 7. Includes a reliquefaction device 12 for reliquefying the boil-off gas of another different type of liquefied gas L and returning it to the tank 3. With this configuration, when the liquefied gas L stored in the tank 3 is LNG that can use the boil-off gas as fuel for the main engine 4, the boil-off gas is supplied to the main engine 4 by the fuel supply device 7. Can be supplied as. Further, in the case of a liquefied gas L of a type other than LNG, the boil-off gas can be reliquefied by the reliquefaction device 12 and returned to the tank 3. Thereby, the boil-off gas can be appropriately treated according to the type of the liquefied gas L.

The ship 10 has at least the hull 2 and the tank 3 used in the existing ship 1. With such a configuration, it is possible to use the existing ship 1 that has been used as an LNG carrier, for example, and to transfer the liquefied gas of a type other than LNG.

(Other modifications)
The present invention is not limited to the above-described embodiment, and includes various modifications of the above-described embodiment without departing from the spirit of the present invention. That is, the specific shape, configuration, and the like described in the embodiment are merely examples, and can be appropriately changed.
For example, the number of the tanks 3 and the shape of the tanks 3 of the existing ship 1 may be arbitrary.
In addition, the tank 3 is not limited to one that stores LNG, and may be one that stores another load such as liquefied petroleum gas (LPG).

In the above embodiment, the liquefied gas L having a specific gravity larger than that of LNG is stored in the tank 3 provided for storing LNG in the existing ship 1, but the present invention is not limited to this. The tank 3 may contain another liquefied gas L having a smaller specific gravity than LNG. in this case. Even if the other liquefied gas L having a smaller specific gravity than LNG is loaded in the tank 3 up to the full liquid level Lx, the load thereof is smaller than that of LNG and does not exceed the allowable load of the tank 3.

In the above embodiment, the case where the same type of liquefied gas L is stored in all of the plurality of tanks 3 included in one ship 10 has been described. However, a plurality of types of liquefied gas L may be simultaneously transported by the ship 10 equipped with a plurality of tanks 3. In this case, the type of liquefied gas L may be different for each tank 3.

1 Existing Ship 2 Hull 2a Bow 2b Ship Bottom 2h Upper Structure 2k Cargo Loading Section 2r Stern 2s Portside 2t Upper Deck 3 Tank 3a Upper 4 Main Engine 7 Fuel Supply Device 8 Liquid Level Detector 9B Manifold 10 Ship 12 Reliquefaction Device 20 Information Processing Device 21 processing unit 22 input unit 23 storage unit 24 determination unit 25 information output unit Da bow-stern direction L liquefied gas (load)
Lm Maximum liquid level set value Lx Full liquid level S1 Identification information input step S2 Gas loading step S3 Liquid level detection step S4 Liquid level determination step S5 Determination result information output step S6 Gas loading stop step V Volume V0 Volume Vm Maximum volume

Claims

With the hull,
A tank provided on the hull for containing a liquid load,
A liquid level detection unit for detecting the liquid level of the load in the tank,
An information processing device to which the value of the liquid level detected by the liquid level detection unit is input,
With
The information processing device,
A storage unit that stores the maximum liquid level setting value of the tank set for each type of the plurality of types of the different loads.
A value of the liquid level input from the liquid level detection unit, a determination unit that determines whether the maximum liquid level set value corresponding to the type of the load accommodated in the tank is reached,
With a ship.
In the storage unit, the maximum liquid level set value set for each type of the loaded object is the state in which the loaded object is stored in the tank up to the maximum liquid level set value. The ship according to claim 1, which is defined so as not to exceed the allowable load of the tank.
Of the plurality of types of the loads to be loaded in the tank, the full liquid level of the tank is set according to the load having the smallest specific gravity, and the other specific gravity is larger than the load having the smallest specific gravity. The vessel according to claim 1 or 2, wherein the maximum liquid level set value of the load is set below the full liquid level.
When it is determined by the determination unit that the value of the liquid level input from the liquid level detection unit has reached the maximum liquid level set value corresponding to the type of the load in the tank, externally, The ship according to any one of claims 1 to 3, further comprising an information output unit that outputs predetermined information.
A fuel supply device that takes out the vaporized component of the load from the tank and supplies it as fuel for a propulsion engine provided in the hull,
The reliquefaction device for reliquefying a vaporized component of another type of the load different from the load to be supplied to the propulsion engine by the fuel supply device and returning the gasified component to the tank. The ship according to any one of items.