JP2022108433A - supply system and vessel - Google Patents

Abstract

To provide a supply system and a vessel capable of suppressing contamination of liquid in a tank even when a plurality of tanks exist for transporting the liquid.SOLUTION: Fuel overflowing from a service tank 31 is returned to a transportation line L1 through an overflow line L2 in a supply system 100. Furthermore, the overflow line L2 is connected downstream of a selection unit 33 among the transportation lines L1. That is, the fuel returned by the overflow line L2 is pressure fed to the service tank 31 again by pumps 34, 36b without being returned to a storage tank 32 which is transfer source. Therefore, an occurrence of contamination is suppressed due to having the overflowing liquid returned to a different tank from the storage tank 32 which is the transporting source.SELECTED DRAWING: Figure 2

Description

The present invention relates to supply systems and ships.

2. Description of the Related Art Conventionally, a ship described in Patent Document 1 is known. The ship described in Patent Literature 1 includes equipment such as an engine housed in an engine room. Fuel is supplied to such an engine, and operation is performed by the fuel.

JP 2018-062313 A

Here, ships such as those described above may include a supply system for supplying a liquid such as fuel to an object such as an engine. For example, the supply system may include a service tank for storing the liquid to be supplied to the object, and a plurality of storage tanks, clarification tanks, etc. for storing the liquid to be transferred to the service tank via the cleaning processing unit. be. Service tanks may also include an overflow line that returns overflowed liquid to the tank from which it was transferred. At this time, if the overflowed liquid is returned to a tank different from the tank from which it was transferred, contamination may occur. Therefore, the overflow line requires piping and a switching valve for returning the liquid to the original tank among the plurality of tanks. However, in such a configuration, if the number of tanks increases, the return pipes and valves will be added accordingly, increasing the cost and possibly causing contamination due to erroneous switching. Therefore, even when there are a plurality of tanks for transferring liquid, a supply system is required that can suppress liquid contamination in the tanks.

The present invention has been made in order to solve such problems, and provides a supply system and a ship that can suppress liquid contamination in tanks even when there are a plurality of tanks for transferring liquid. intended to provide

The supply system of the present invention includes a first tank that supplies a liquid to a target part, a plurality of second tanks that store the liquid to be transferred to the first tank, and a plurality of second tanks that store the first liquid. A selection unit that selects a tank to transfer liquid from among the tanks, a transfer line that connects the selection unit and the first tank, and an overflow line that returns the liquid overflowing the first tank to the transfer line. , the overflow line is connected to the transfer line downstream from the selection section.

The supply system includes: a plurality of second tanks storing liquid to be transferred to the first tank; a selection unit for selecting a tank from the plurality of second tanks to transfer the liquid to the first tank; Prepare. Therefore, the tank selected by the selector from among the plurality of second tanks can transfer the liquid to the first tank. Here, the liquid overflowing the first tank is returned to the transfer line via the overflow line. Furthermore, an overflow line is connected to the transfer line downstream from the selection section. That is, the liquid returned by the overflow line is transferred to the first tank again without being returned to the second tank, which is the transfer source. Therefore, it is possible to prevent the overflowed liquid from being returned to a tank different from the second tank, which is the transfer source, and causing contamination. As described above, even when there are a plurality of tanks for transferring the liquid, contamination of the liquid in the tanks can be suppressed.

At the time of overflow, liquid at a third flow rate obtained by subtracting a second flow rate of liquid supplied from the first tank to the target part from the first flow rate of liquid transferred to the first tank is discharged from the overflow line. A second flow rate of liquid may be transferred from the tank that is returned to the transfer line and selected by the selector. For example, when the overflow line returns the liquid to the source tank, i.e., the tank selected by the selector, a first flow rate of liquid is transferred from the source tank to the first tank. . In this case, even if the liquid is once cleaned by a cleaning device or the like, it diffuses in the original tank. Then, the cleanliness of the liquid is almost the same as before and after returning. In contrast, in the supply system according to the present invention, the liquid at the second flow rate is transferred from the tank selected by the selection unit. In other words, the cleaned liquid is not diffused in the tank, but only merges with the liquid of the second flow rate, so that the liquid having a higher degree of cleanliness than that of the comparative example can be supplied to the first tank.

A ship according to the invention comprises a supply system as described above.

According to this ship, it is possible to obtain the same functions and effects as the supply system described above.

Advantageous Effects of Invention According to the present invention, it is possible to provide a supply system and a ship capable of suppressing liquid contamination in the tanks even when there are a plurality of tanks that transfer the liquid via the cleaning processing section.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic sectional drawing which shows an example of the ship to which the supply system which concerns on embodiment of this invention is applied. 1 is a schematic configuration diagram showing a supply system according to an embodiment of the invention; FIG. FIG. 3 is a schematic configuration diagram showing a supply system according to a comparative example;

Preferred embodiments of the supply system of the present invention will be described below with reference to the drawings. In the following explanation, the terms "front" and "rear" correspond to the direction of travel of the hull, and the term "lateral" corresponds to the lateral (width) direction of the hull. The term "bottom" corresponds to the vertical direction of the hull.

FIG. 1 is a schematic cross-sectional view showing an example of a ship to which a supply system according to an embodiment of the invention is applied. The ship 1 is, for example, a ship that transports petroleum-based liquid cargo such as crude oil and liquid gas, and is, for example, an oil tanker. Note that the vessel is not limited to an oil tanker, and may be, for example, a bulk carrier or other various types of vessels.

The ship 1 includes a hull 11 and a propeller 12, as shown in FIG. The hull 11 has a bow section 2 , a stern section 3 , an engine room 4 , a pump room 5 and a cargo room 6 . A deck 19 is provided on the top of the hull 11 (or inside the ship). The bow 2 is positioned forward of the hull 11 . The stern portion 3 is positioned on the rear side of the hull 11 . The bow 2 has a shape designed to reduce wave-making resistance in, for example, a full draft. The propulsion device 12 propels the hull 11, and uses, for example, a screw shaft. The propeller 12 is installed below the waterline (water surface of the sea W) in the stern portion 3 . A rudder 15 for adjusting the direction of propulsion is installed below the waterline in the stern portion 3 .

The engine room 4 is provided at a position adjacent to the bow side of the stern portion 3 . The engine room 4 is a section for arranging an engine 16 for applying driving force to the propeller 12 . The pump room 5 is provided at a position adjacent to the engine room 4 on the bow side. The pump chamber 5 is a section in which the pump 17 and the like are arranged. A cargo compartment 6 is provided between the bow section 2 and the pump compartment 5 . Cargo compartment 6 is a compartment for containing petroleum-based cargo. The cargo compartment 6 is divided into a cargo oil tank 26 and a ballast tank 27 by adopting a double hull structure of an outer plate 20 and an inner bottom plate 21 . The cargo oil tank 26 loads petroleum-based cargo carried by the vessel 1 . The ballast tank 27 accommodates an amount of ballast water according to the size of the ship.

The engine room 4 is provided with a supply system 100 for supplying liquid to objects. In this embodiment, fuel is adopted as the liquid, and the supply system 100 is a system that supplies the fuel to the engine 16 as the object. The type of liquid is not particularly limited.

FIG. 2 is a schematic configuration diagram showing the configuration of the supply system 100 according to the embodiment of the invention. The supply system 100 is a system that cleans fuel and supplies it from a service tank 31 (first tank) to an object to be supplied. As shown in FIG. 2, the supply system 100 includes a service tank 31, a plurality of storage tanks 32 (second tanks), a selection section 33, a transfer line L1, a suction pump 34 (pumping section), and a cleaning tank. A device 36 and an overflow line L2 are provided.

The service tank 31 is a tank that stores fuel after cleaning treatment to be supplied to an object (here, the engine 16). The service tank 31 supplies fuel to the object through the supply line L3. The service tank 31 has a liquid level detector 31a that detects the liquid level F1 of the stored fuel. Further, the service tank 31 is provided with an overflow mechanism 31b that causes the fuel to overflow when the liquid surface F1 reaches a preset height position. Fuel overflowing from the overflow mechanism 31b of the service tank 31 flows to the overflow line L2.

A plurality of storage tanks 32 are tanks that store fuel to be transferred to the service tank 31 . In the example shown in FIG. 2, only two storage tanks 32 are shown to facilitate understanding of the structure, but a larger number of "second tanks" may be provided. Further, the "second tank" may be not only a storage tank but also a tank such as a clarification tank (a tank that separates liquid from water and sludge). A plurality of storage tanks 32 are arranged at a position lower than the service tank 31 .

The selection unit 33 is a mechanism for selecting a tank for transferring fuel to the service tank 31 from the plurality of storage tanks 32 . The selection unit 33 includes an individual line L4 that extends from each storage tank 32 and merges, and valves 33a and 33b that are provided in each individual line L4. Accordingly, when transferring fuel from the storage tank 32A, the selector 33 opens the valve 33a of the storage tank 32A and closes the valve 33b of the storage tank 32B.

The transfer line L<b>1 is a line that connects the selection unit 33 and the service tank 31 . The transfer line L1 extends to the service tank 31 from the junction of the individual lines L4 of the selection section 33 . The transfer line L1 includes a line L1a extending downward from the selection portion 33, a line L1b extending at a position lower than the storage tank 32 and the service tank 31, and a line L1c extending upward and connected to the service tank 31.

The suction pump 34 is provided in the transfer line L<b>1 and is a pumping unit that pumps the fuel to the service tank 31 . The suction pump 34 sucks fuel from one of the plurality of storage tanks 32 selected by the selection unit 33 and supplies the fuel to the cleaning device 36 .

The cleaning device 36 is a device that cleans the fuel transferred from the storage tank 32 . The cleaning device 36 includes a cleaning processing section 36a and a pump 36b (pumping section). The cleaning processor 36a is a device that removes impurities from the fuel. The pump 36b is a pumping unit that pumps the fuel, from which impurities have been removed by the cleaning processing unit 36a, to the service tank 31. As shown in FIG. The pump 36b raises the fuel to the service tank 31 at a high position via the line L1c.

The overflow line L2 is a line that returns fuel overflowing from the service tank 31 to the transfer line L1. The overflow line L2 is connected to the overflow mechanism 31b. The overflow line L2 is connected between the selection section 33 and the suction pump 34 in the transfer line L1. In this embodiment, there are two pumping units, the suction pump 34 and the pump 36 b of the cleaning device 36 . Line L2 is connected.

Next, the operation of the supply system 100 and the flow rate of fuel in each line will be described. First, the explanation starts from the state where the fuel in the service tank 31 is low. Also, it is assumed that the selection unit 33 selects the storage tank 32A first. Further, the operation of the pumps 34, 36b and the valves 33a, 33b of the selection unit 33 is performed by a control unit (not shown). Alternatively, an operator may operate manually. In the following description, the flow rate of fuel transferred to the service tank 31 will be referred to as a flow rate Q1 (first flow rate). Also, the flow rate of the fuel supplied to the target portion by the service tank 31 is referred to as a flow rate Q2 (second flow rate). The flow rate Q1 is greater than the flow rate Q2.

First, the suction pump 34 sucks fuel at a flow rate Q1 (first flow rate) from the storage tank 32A through the lines L1a and L1b of the transfer line L1. Then, the pump 36b transfers the fuel at the flow rate Q1 to the service tank 31 by raising the fuel through the line L1c of the transfer line L1. On the other hand, the service tank 31 supplies fuel at a flow rate Q2 to the object through the supply line L3. At this time, the flow rate Q1 of fuel entering the service tank 31 is greater than the flow rate Q2 of fuel leaving the service tank 31 . Therefore, the fuel in the service tank 31 increases at a flow rate Q3 (third flow rate) obtained by subtracting the flow rate Q2 from the flow rate Q1. Therefore, the liquid level F1 of the fuel in the service tank 31 rises. Then, when the liquid level F1 reaches the upper limit, the fuel overflows from the service tank 31 .

Next, the flow rate relationship in the supply system 100 at the time of overflow will be described. At the time of overflow, a flow rate Q3 of fuel obtained by subtracting the flow rate Q2 from the flow rate Q1 is returned from the overflow line L2 to the transfer line L1. Here, the suction pump 34 sucks fuel at a flow rate of Q1, which includes fuel at a flow rate of Q3 from the overflow line L2. Then, the fuel of flow rate Q2 is transferred from the storage tank 32A selected by the selector 33 according to the relational expression of "flow rate Q1-flow rate Q3 (=flow rate Q1-flow rate Q2)". When the fuel in the storage tank 32A runs out, the selector 33 closes the valve 33a of the storage tank 32A and opens the valve 33b of the storage tank 32B to select another storage tank 32B. As a result, the fuel of the flow rate Q2 is transferred from the storage tank 32B.

Next, the actions and effects of the supply system 100 and the ship 1 according to this embodiment will be described.

The supply system 100 includes a plurality of storage tanks 32 that store fuel to be transferred to the service tank 31, and a selection unit 33 that selects a tank from the plurality of storage tanks 32 to transfer the fuel to the service tank 31. . Further, the transfer line L1 is provided with a cleaning processing section 36a that cleans the fuel. Therefore, the tank selected by the selector 33 from among the plurality of storage tanks 32 can transfer fuel to the service tank 31 via the cleaning processor 36a.

Here, a supply system 200 according to a comparative example will be described with reference to FIG. 3 . The overflow line L12 of the supply system 200 according to the comparative example returns the fuel to the transfer source storage tank 32 among the plurality of storage tanks 32 . Therefore, the overflow line L12 is connected to a selector 233 that selects the storage tank 32 to return fuel. In the supply system 200, when the selection unit 33 selects the storage tank 32A, the selection unit 233 also selects the storage tank 32A. Overflow line L12 returns fuel at flow rate Q3 (=flow rate Q1 - flow rate Q2) to the selected storage tank 32A. Then, from the storage tank 32A, the fuel of the flow rate Q1 is transferred by the suction pump . Here, if the number of storage tanks 32 increases, the number of pipes and the number of valves of the selection unit 233 will increase accordingly. Furthermore, there is a high possibility that the selection unit 233 will select the wrong storage tank 32 . For example, while the selection unit 33 selects the storage tank 32A, for example, if the selection unit 233 selects the wrong storage tank 32B (due to operator error, control unit error, etc.), Contamination will occur in the storage tank 32B because the fuel transferred from the storage tank 32A is returned to another storage tank 32B.

On the other hand, in the supply system 100 according to this embodiment, the fuel overflowing from the service tank 31 is returned to the transfer line L1 via the overflow line L2. Furthermore, the overflow line L2 is connected downstream of the selection section 33 in the transfer line L1, here between the selection section 33 and the suction pump . That is, the fuel returned through the overflow line L2 is pressure-fed again to the service tank 31 by the pumps 34, 36b without being returned to the storage tank 32 from which it was transferred. Therefore, it is possible to prevent the overflowed liquid from being returned to a tank different from the storage tank 32 from which the liquid is transferred and causing contamination. As described above, even when there are a plurality of storage tanks 32 and clarification tanks for transferring fuel, liquid contamination in the tanks can be suppressed.

At the time of overflow, the fuel at a flow rate Q3 obtained by subtracting the flow rate Q2 of the fuel supplied to the target part from the service tank 31 from the flow rate Q1 of the fuel transferred to the service tank 31 is returned from the overflow line L2 to the transfer line L1, From the storage tank 32 selected by the selection unit 33, the fuel of the flow rate Q2 is transferred. In the supply system 200 according to the comparative example, from the transfer source storage tank 32 selected by the selection unit 233, the fuel of the flow rate Q1 to be transferred to the service tank 31 is transferred. In this case, even if the fuel is once cleaned by the cleaning device 36 , it diffuses within the original storage tank 32 . Then, the cleanliness of the fuel is almost the same as before and after the return. On the other hand, in the supply system 100 according to the present embodiment, the liquid at the flow rate Q2 is transferred from the storage tank 32 selected by the selection unit 33 . In other words, the cleaned fuel is not diffused in the storage tank 32 and only joins with the fuel of the flow rate Q2.

A ship 1 according to the invention comprises a supply system 100 as described above.

According to this ship 1, it is possible to obtain the same functions and effects as the supply system 100 described above.

The invention is not limited to the embodiments described above.

For example, the configuration of the supply system shown in FIG. 2 is merely an example, and may be changed as appropriate without departing from the gist of the present invention. For example, the structure and arrangement of the cleaning device 36 are not limited to those shown in FIG. 2, and may be changed as appropriate. For example, pump 36b may be omitted from cleaning device 36 . Also, the positions of the cleaning device 36 and the suction pump 34 may be reversed. Moreover, the transfer line L1 only needs to have at least one pumping unit, and one of the pumps 34 and 36b may be omitted. In this case, one pump is responsible for sucking the fuel and raising the fuel to the service tank 31 .

DESCRIPTION OF SYMBOLS 1... Vessel, 31... Service tank (first tank), 32, 32A, 32B... Storage tank (second tank), 33... Selection part, 34... Suction pump (pumping part), 36a... Cleaning treatment part, 36b... Pump (pumping unit), 100... Supply system, L1... Transfer line, L2... Overflow line.

Claims (3)

a first tank that supplies liquid to the target part;
a plurality of second tanks storing the liquid to be transferred to the first tank;
a selection unit that selects, from the plurality of second tanks, a tank that transfers the liquid to the first tank;
a transfer line connecting the selection unit and the first tank;
an overflow line returning the liquid overflowing the first tank to the transfer line;
The supply system, wherein the overflow line is connected downstream of the selection section in the transfer line. At overflow,
The liquid at a third flow rate obtained by subtracting the second flow rate of the liquid supplied from the first tank to the target part from the first flow rate of the liquid transferred to the first tank, returned from the overflow line to the transfer line;
2. The supply system according to claim 1, wherein a second flow rate of said liquid is transferred from said tank selected by said selector. A ship equipped with a supply system according to claim 1 or 2.

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