WO2019088308A1

WO2019088308A1 - Fuel oil supply system and method for ship

Info

Publication number: WO2019088308A1
Application number: PCT/KR2017/012082
Authority: WO
Inventors: 김종현
Original assignee: 대우조선해양 주식회사
Priority date: 2017-10-30
Filing date: 2017-10-30
Publication date: 2019-05-09
Also published as: CN110770118B; JP6910484B2; SG11201912007XA; CN110770118A; JP2020523252A

Abstract

A fuel oil supply method for a ship is disclosed. The fuel oil supply method for a ship is a method for supplying fuel oil to an engine that uses both natural gas and fuel oil as fuel, the method comprising: supplying compressed air to a pressurized tank and storing fuel oil in a pressurized state; when the engine is operated in a fuel oil mode, supplying the fuel oil stored in the pressurized tank to a circulation pump, and adjusting, by a temperature adjusting device, the fuel oil, pressurized by the circulation pump, to a temperature that is required by the engine; and supplying the fuel oil that has passed through the temperature adjusting device to the engine.

Description

Fuel oil supply system and method of a ship

The present invention relates to a fuel oil supply system and method for supplying fuel oil to an engine using both natural gas and fuel oil as fuel.

In recent years, consumption of liquefied gas such as Liquefied Natural Gas (LNG) has been rapidly increasing worldwide. The liquefied gas obtained by liquefying the gas at a low temperature has an advantage of being able to increase the storage and transport efficiency because the volume becomes very small as compared with the gas. In addition, liquefied natural gas, including liquefied natural gas, can be removed as an eco-friendly fuel with less air pollutant emissions during combustion because air pollutants can be removed or reduced during the liquefaction process.

Liquefied natural gas is a colorless transparent liquid obtained by cooling methane-based natural gas to about -162 ° C and liquefying it, and it has a volume of about 1/600 of that of natural gas. Therefore, when the natural gas is liquefied and transported, it can be transported very efficiently.

However, since the liquefaction temperature of natural gas is a cryogenic temperature of -162 ° C at normal pressure, liquefied natural gas is sensitive to temperature changes and is easily evaporated. As a result, the storage tank storing the liquefied natural gas is subjected to heat insulation, but the external heat is continuously transferred to the storage tank. Therefore, in the transportation of liquefied natural gas, the liquefied natural gas is naturally vaporized continuously in the storage tank, -Off Gas, BOG) occurs. This also applies to other low temperature liquefied gases such as ethane.

Evaporation gas is a kind of loss and is an important issue in transport efficiency. Further, when the evaporation gas accumulates in the storage tank, the internal pressure of the tank may rise excessively, and there is a risk that the tank may be damaged. Accordingly, various methods for treating the evaporative gas generated in the storage tank have been studied. Recently, a method of re-liquefying the evaporated gas and returning it to the storage tank for treating the evaporated gas, a method of returning the evaporated gas to the storage tank And a method of using it as an energy source of a consuming place.

On the other hand, ME-GI engine and DF (Dual Fuel) engine are the engines that can use natural gas as a fuel among engines used in ships.

The ME-GI engine consists of two strokes and employs a diesel cycle in which high pressure natural gas at around 300 bar is injected directly into the combustion chamber at the top of the piston.

The DF engine is composed of four strokes, and injects natural gas having a pressure of about 6.5 bar, which is relatively low pressure, into an Otto Cycle, in which a piston, which is a mixture of combustion air and natural gas, ).

Since natural gas is cheaper than fuel oil and it needs to deal with the evaporative gas from storage tanks that store liquefied natural gas, the ME-GI engine and the DF engine will preferentially use natural gas as fuel, And may be operated to use fuel oil when the gas is insufficient.

Prior to operating the engine in a manner that uses natural gas as fuel, the amount of fuel oil used is small or not. Conventionally, the fuel oil supply pump must always be operated to supply fuel oil immediately in the event of a shortage of natural gas And the energy loss is large.

An object of the present invention is to provide a fuel oil supply system and method for a ship in which a fuel oil supply pump can be supplied to an engine immediately when natural gas is insufficient, while the fuel oil supply pump is always operated only when necessary.

According to an aspect of the present invention, there is provided a method for supplying fuel oil to an engine using both natural gas and fuel oil as fuel, comprising the steps of: supplying compressed air to a pressurizing tank The fuel oil stored in the pressurizing tank is supplied to the circulating pump when the engine is operated in the fuel oil mode and the fuel oil pressurized by the circulating pump is supplied to the temperature regulating device Wherein the engine is controlled to a temperature required by the engine, and fuel oil having passed through the temperature control device is supplied to the engine.

When the fuel oil stored in the pressurizing tank does not satisfy the required amount of the engine, the fuel oil stored in the storage tank can be supplied to the engine by the supply pump.

When the amount of the fuel oil in the pressurizing tank becomes equal to or less than the first measured value, the fuel oil stored in the storage tank can be supplied to the pressurizing tank by the supply pump.

The remaining fuel oil used in the engine may be temporarily stored in a pipe and sent to the circulation pump after the air is removed.

The fuel oil stored in the pipe can be sent to the storage tank when the amount of the fuel oil in the pipe becomes equal to or greater than the third measured value.

The remaining fuel used in the engine can be bypassed to the storage tank.

The fuel oil discharged from the pressurizing tank can be prevented from flowing backward in the direction of the supply pump.

According to another aspect of the present invention, there is provided a fuel oil supply system for a ship, which supplies fuel oil to an engine using both natural gas and fuel oil as fuel, A storage tank for storing; A supply pump for pressurizing the fuel oil discharged from the storage tank; A pressurization tank installed at a downstream end of the feed pump to receive compressed air and store fuel oil in a pressurized state; A circulation pump installed at a downstream end of the pressurizing tank to pressurize fuel oil; And a temperature control unit installed at a downstream end of the circulation pump and controlling the fuel oil pressurized by the circulation pump to a temperature required by the engine. When the engine is operated in the fuel oil mode, There is provided a fuel supply system for a ship that supplies fuel to the engine preferentially.

The fuel oil supply system of the vessel may further include a return line branched from the line between the supply pump and the pressurizing tank and joined to the line between the supply pump and the storage tank, Fuel oil in the fuel oil that is not used in the engine can be circulated by the return line.

The return line may include a heat radiating pipe.

The circulation pump includes: fuel oil discharged from the pressure tank; Or a fluid in which the fuel oil discharged from the pressurizing tank and the fuel oil compressed by the supply pump are joined together.

The fuel oil supply system of the ship may further include a water level detector installed inside the pressure tank for measuring an amount of fuel oil stored in the pressure tank, A signal is transmitted to the feed pump to operate the feed pump, and when the measured amount of the fuel oil is equal to or greater than the second measured value, a signal is transmitted to the feed pump to stop the feed pump, When the amount of fuel oil measured by the water level detector is equal to or less than the first measurement value, the supply pump can pressurize the fuel oil discharged from the storage tank and supply the pressurized fuel to the pressurization tank.

The fuel oil supply system of the present invention comprises: a pipe for temporarily storing fuel oil used in the engine; And an air removing device for removing air contained in the fuel oil temporarily stored in the pipe, and the fuel oil from which the air is removed by the air removing device may be sent to the circulating pump.

The fuel oil supply system of the vessel may further include a first valve that opens when the amount of the fuel oil in the pipe becomes equal to or greater than a third measured value and sends the fuel oil stored in the pipe to the storage tank.

The fuel oil supply system of the vessel may further include a bypass line branched from the pipe and the engine and merging between the pipe and the storage tank so that the fuel oil bypasses the pipe, Can be supplied to the tank.

The fuel oil supply system of the ship may further include a flow meter installed at the feed pump and a downstream end of the pressurizing tank for measuring a flow rate of fuel oil supplied to the engine.

The fuel oil supply system of the ship may further include a filtration device installed at a front end of the engine to filter out impurities mixed with fuel oil sent to the engine.

The fuel oil supply system of the ship may include a fifth valve installed between the supply pump and the pressurizing tank to prevent fuel oil discharged from the pressurizing tank from flowing back to the supply pump.

According to another aspect of the present invention, when the engine is driven in a fuel oil mode, fuel oil stored in a pressurized state is first supplied to the engine, and the pressurized state The fuel oil stored in the storage tank is pressurized by the supply pump and supplied to the engine when the fuel oil stored in the storage tank is insufficient.

According to the present invention, since the fuel oil stored in the pressurized tank is preferentially used when the engine is driven in the fuel oil mode, including a pressurized tank that stores pressurized fuel oil by compressed air, Energy can be saved.

Further, according to the present invention, even when the feed pump is to be driven, the feed pump can be driven while the engine consumes the fuel oil stored in the pressurized tank, so that the time required for driving the feed pump can be secured.

1 is a schematic view of a fuel supply system for a ship according to a first preferred embodiment of the present invention.

2 is a schematic view of a fuel supply system for a ship according to a second preferred embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In addition, the following examples can be modified in various forms, and the scope of the present invention is not limited to the following examples.

1, the fuel supply system for a ship of the present embodiment includes a storage tank 300, a supply pump 400, a pressurization tank 500, a return line L1, a circulation pump 700, Device 800. < / RTI >

The storage tank 300 of this embodiment stores fuel oil, and the fuel oil stored in the storage tank 300 is supplied to the engine 100. A portion of the fuel oil remaining in the engine 100 can be sent to the storage tank 300. On the line where the remaining fuel used in the engine 100 is sent to the storage tank 300, A valve 30 may be provided.

The engine 100 in which the fuel supply system of the present embodiment supplies fuel oil is an engine that can use both gas and fuel oil as fuel, and may be an ME-GI engine. The engine 100 of this embodiment can be operated in a gas mode using natural gas as its main fuel or a fuel oil mode using fuel oil as fuel.

The supply pump 400 of this embodiment pressurizes the fuel oil discharged from the storage tank 300. The supply pump 400 of the present embodiment may be configured so that a plurality of pumps are installed in parallel so that, when one or more pumps fail, they can be replaced with another pump.

The pressurizing tank 500 of this embodiment is installed at the downstream end of the feed pump 400 and receives pressurized air from the outside to store the pressurized fuel oil. On the line for supplying compressed air to the pressurizing tank 500, a second valve 20 for controlling the flow rate and opening / closing of the compressed air may be provided.

The fuel oil supply system of the present embodiment is provided between the pressurizing tank 500 and the supply pump 400 and is provided between the pressurizing tank 500 and the supply pump 400 to prevent the fuel oil discharged from the pressurizing tank 500 from flowing back to the supply pump 400. [ And may further include a valve (50).

Since the fuel supply system of the present embodiment includes the pressurization tank 500, when the engine 100 is operated in the fuel oil mode, the fuel oil stored in the pressurization tank 500 is preferentially supplied to the engine 100 .

In general, since the natural gas is first used as the fuel of the engine 100 and the fuel oil is used as the fuel of the engine 100 only when the natural gas is insufficient, the amount of the fuel oil is small. Accordingly, fuel oil can be supplied to the engine 100 with sufficient stability even by the pressurizing tank 500 of the present embodiment. When the fuel oil stored in the pressurizing tank 500 is insufficient, the feed pump 400 is operated.

According to the fuel oil supply system of the present embodiment, since the supply pump 400 is operated only in an exceptional condition that the fuel oil stored in the pressurization tank 500 is insufficient, the energy for operating the supply pump 400 can be reduced have.

According to the fuel supply system of the present embodiment, since the supply pump 400 is operated while the engine 100 consumes the fuel oil stored in the pressurizing tank 500, the supply pump 400 is operated It is possible to secure the time taken.

In addition, since the amount of the fuel oil used in the engine 100 is not large and the loss of the fuel oil is not large, even when the supply pump 400 is not operated, a sufficient pressure for circulating the fuel oil by the circulation pump 700 is obtained .

That is, according to the fuel oil supply system of the present embodiment, the fuel oil can be stably supplied to the engine 100 without operating the supply pump 400 at all times.

The return line L1 of the present embodiment branches off from the line between the supply pump 400 and the pressurization tank 500 and merges into the line between the supply pump 400 and the storage tank 300. [

The fuel oil compressed by the feed pump 400 may be further compressed by the circulation pump 700 and then supplied to the engine 100 or may be sent to the upstream side of the feed pump 400 by the return line L1 The fuel oil that is not used in the fuel oil engine 100 compressed by the supply pump 400 is sent to the upstream side of the feed pump 400 by the return line L1 and is again compressed by the feed pump 400 In the same manner as described above.

In order to operate the supply pump 400, a certain flow rate of fuel oil is required. In the case where the engine 100 does not require fuel oil or requires only a small amount, all or a part of the fuel oil compressed by the supply pump 400 Through the return line L1.

A part of the return line L1 is formed of a heat radiating pipe, and is compressed by the supply pump 400, so that not only the pressure but also the temperature of the fuel oil passing through the heat radiating pipe can be lowered. On the return line L1, a fourth valve 40 for regulating the flow rate and opening / closing of the fuel oil may be provided.

Conventionally, since the supply pump 400 is always operated to immediately supply the fuel oil when the engine 100 is operated in the fuel oil mode without the pressure tank 500, the remaining fuel oil is circulated The return line L1 is essentially required.

The circulation pump 700 of this embodiment is installed at the downstream end of the supply pump 400 and the pressurization tank 500 to pressurize the fuel oil. The circulation pump 700 of the present embodiment may be configured such that a plurality of circulation pumps 700 are installed in parallel to be replaced with other pumps when one or more pumps fail.

The circulation pump 700 of the present embodiment compresses the fuel oil discharged from the pressurizing tank 500 or pressurizes the fuel oil discharged from the pressurizing tank 500 and the supply pump 400 The compressed fuel oil compresses the merged fluid.

That is, when the amount of the fuel oil required in the engine 100 is relatively small, the supply pump 400 is not operated, and only the fuel oil stored in the pressurizing tank 500 is supplied to the engine 100, The fuel oil discharged from the pressurizing tank 500 is compressed and supplied to the engine 100.

In addition, when the amount of fuel oil required in the engine 100 is relatively large, the supply pump 400 supplies the required amount, which is insufficient only by the fuel oil stored in the pressurizing tank 500, so that the circulating pump 700, The fuel oil discharged from the engine 500 and the fuel oil compressed by the supply pump 400 are compressed and supplied to the engine 100.

The temperature control device 800 of this embodiment is disposed at the downstream end of the circulation pump 700 to regulate the fuel oil compressed by the circulation pump 700 to a temperature required by the engine 100. [ Depending on the configuration of the system, the temperature regulator 800 of the present embodiment may be a heater or a cooler.

The fuel supply system of the present embodiment may further include a water level detector 510 installed inside the pressurization tank 500.

The water level detector 510 of the present embodiment detects the level of the fuel oil in the pressurizing tank 500 and measures the amount of the fuel oil in the pressurizing tank 500. When the amount of fuel oil measured by the water level detector 510 is equal to or less than the first measurement value, a signal is sent from the water level detector 510 to the feed pump 400 to operate the feed pump 400.

The fuel oil compressed by the supply pump 400 that receives the signal from the water level detector 510 is sent to the pressurizing tank 500. When the amount of fuel oil in the pressurizing tank 500 becomes equal to or greater than the second measured value, The level detector 510 again sends a signal to the feed pump 400, causing the feed pump 400 to stop operating.

The fuel supply system for a ship of the present embodiment may further include a pipe 200 and an air removal device 210. [

The pipe 200 of this embodiment temporarily stores the fuel oil that is used in the engine 100 and remains. The fuel oil stored in the pipe 200 is removed by the air removing device 210, and the air removed by the air removing device 210 is discharged to the outside.

The fuel oil from which the air has been removed by the air removing device 210 is discharged to the outside through the fuel oil discharged from the pressurizing tank 500 or the fuel oil discharged from the pressurizing tank 500 and the fuel oil compressed by the supply pump 400 Is sent to the circulation pump 700 and used again as fuel for the engine.

According to the fuel supply system for a ship of the present embodiment, since air remaining in the engine 100 is removed after the air is removed from the engine 100, air bubbles generated when the fuel oil is heated are minimized, Can be minimized.

When the fuel oil supply system of the present embodiment includes the pipe 200, it may further include a first valve 10 installed on a line through which fuel oil is sent from the pipe 200 to the storage tank 300 have.

The first valve 10 of this embodiment is normally kept closed and opened when the amount of fuel oil in the pipe 200 becomes too large (hereinafter referred to as a "third measured value"), So that fuel oil can be sent from the pipe 200 to the storage tank 300.

When the fuel oil supply system of the present embodiment includes the pipe 200, the bypass line L2 (which is branched from the pipe 200 and the engine 100 and joined between the pipe 200 and the storage tank 300) ). &Lt; / RTI >

When the present embodiment includes the bypass line L2, the fuel oil used and remaining in the engine 100 may be sent to the pipe 200, bypassed the pipe 200, and then bypass the storage tank 300 The bypass line L2 is not normally used but is used when the fuel oil is replaced or when the pipe 200 is damaged and can not be used.

The fuel oil supply system of the present embodiment may further include a flow meter 600 installed between the pressurizing tank 500 and the engine 100 to measure the flow rate of the fuel oil.

The flow meter 600 of the present embodiment is installed at the rear end of the supply pump 400 and the pressurizing tank 500. This makes it possible to prevent the flow of the fuel discharged from the pressurizing tank 500 to the engine, The flow rate of the fuel oil sent to the engine 100 can be confirmed in all cases where the fuel oil mixed with the fuel oil compressed by the supply pump 400 is sent to the engine 100.

The fuel oil supply system of the present embodiment may further include a filtration device 900 installed at a front end of the engine 100 to filter out impurities mixed with fuel oil sent to the engine 100.

An example of the flow of the fuel oil when the fuel oil supply system of the present embodiment further includes the pipe 200, the flow meter 600 and the filtration device 900 will be described as follows.

When the engine 100 is in the fuel-oil mode, the pressurized fuel oil stored in the pressurizing tank 500 is discharged, and is sent to the circulating pump 700 after passing through the flow meter 600. The fuel oil pressurized by the circulation pump 700 is supplied to the engine 100 after passing through the temperature regulating device 800 and the filtration device 900. The fuel oil remaining after being used in the engine 100 is sent to the pipe 200 to remove the mixed air and then sent to the circulation pump 700 again.

The supply pump 400 operates to compress the fuel oil discharged from the storage tank 300 when the required amount of the engine 100 can not be satisfied with only the fuel oil stored in the pressurizing tank 500. [ The fuel oil compressed by the feed pump 400 passes through the flow meter 600, the circulating pump 700, the temperature regulating device 800, and the filtration device 900 together with the fuel oil discharged from the pressurizing tank 500 And supplied to the engine 100.

When the engine 100 enters the gas mode, the feed pump 400 operates to replenish the fuel oil consumed in the pressurizing tank 500, and the feed pump 400 feeds the fuel oil discharged from the storage tank 300 And sends it to the pressurizing tank 500. When the amount of fuel oil in the pressurizing tank 500 is reduced due to leakage or the like in the pressurizing tank 500 as usual, the supply pump 400 operates to compress the fuel oil discharged from the storage tank 300 And can be sent to the pressurization tank 500.

A difference exists in that the fuel supply system of the ship of the second embodiment shown in Fig. 2 does not include the return line L1 as compared with the fuel supply system of the ship of the first embodiment shown in Fig. 1 , The differences will be mainly described below. A detailed description of the same components as those of the fuel supply system of the ship of the first embodiment will be omitted.

2, the fuel oil supply system for a ship according to the present embodiment includes a storage tank 300, a supply pump 400, a pressurization tank 500, a return line L1, (700), and a temperature controller (800).

The storage tank 300 of this embodiment stores fuel oil in the same manner as in the first embodiment, and the fuel oil stored in the storage tank 300 is supplied to the engine 100. A part of the fuel oil remaining in the engine 100 can be sent to the storage tank 300. On the line where the remaining fuel used in the engine 100 is sent to the storage tank 300, And a third valve 30 for controlling opening and closing.

The engine 100 in which the fuel supply system of the present embodiment supplies the fuel oil is an engine that can use both gas and fuel oil as fuel as in the first embodiment, and may be an ME-GI engine. The engine 100 of this embodiment can be operated in a gas mode using natural gas as its main fuel or a fuel oil mode using fuel oil as fuel as in the first embodiment.

The supply pump 400 of this embodiment pressurizes the fuel oil discharged from the storage tank 300 as in the first embodiment. As in the first embodiment, the supply pump 400 of the present embodiment may be configured such that a plurality of pumps are provided in parallel to replace one pump when another pump fails.

As in the first embodiment, the pressurizing tank 500 of this embodiment is provided at the downstream end of the feed pump 400, and receives pressurized air from the outside to store fuel oil in a pressurized state. On the line for supplying the compressed air to the pressurizing tank 500, a second valve 20 for controlling the flow rate and opening / closing of the compressed air may be provided as in the first embodiment.

The fuel oil supply system of the present embodiment is provided between the pressurizing tank 500 and the supply pump 400 so that the fuel oil discharged from the pressurizing tank 500 is supplied to the supply pump 400 And may further include a fifth valve 50 that prevents backflow.

The fuel supply system of the present embodiment of the present invention supplies the fuel oil stored in the pressurized tank 500 to the engine 100 preferentially when the engine 100 is operated in the fuel oil mode as in the first embodiment , And operates the supply pump 400 when the fuel oil stored in the pressurizing tank 500 is insufficient.

According to the fuel oil supply system of the present embodiment, as in the first embodiment, it is possible to stably supply fuel oil to the engine 100 without operating the supply pump 400 at all times.

The circulation pump 700 of the present embodiment is installed at the downstream end of the feed pump 400 and the pressurization tank 500 to pressurize the fuel oil as in the first embodiment. The circulation pump 700 of the present embodiment may be configured such that a plurality of the circulation pumps 700 are installed in parallel and replaced by another pump when one or more pumps fail.

The circulating pump 700 of the present embodiment compresses only the fuel oil discharged from the pressurizing tank 500 and supplies it to the engine 100 when the amount of the fuel oil required by the engine 100 is relatively small as in the first embodiment And when the amount of fuel oil required in the engine 100 is relatively large, the fuel oil discharged from the pressurizing tank 500 and the fuel oil compressed by the supply pump 400 are compressed, To the engine (100).

The temperature control device 800 of this embodiment is provided at the downstream end of the circulation pump 700 to regulate the fuel oil compressed by the circulation pump 700 to a temperature required by the engine 100 do. The temperature regulating device 800 of this embodiment may be a heater or a cooler as in the first embodiment.

The fuel oil supply system of the present embodiment of the present invention may further include a water level detector 510 installed inside the pressurization tank 500 as in the first embodiment.

The water level detector 510 of the present embodiment detects the level of the fuel oil in the pressurizing tank 500 as in the first embodiment, and when the measured amount of the fuel oil is equal to or lower than the first measured value, The supply pump 400 is operated to send a signal to the supply pump 400 again when the amount of the fuel oil in the pressurization tank 500 becomes equal to or greater than the second measurement value, To stop operation.

The fuel oil supply system of the present embodiment of the present invention may further include a pipe 200 and an air removal device 210 as in the first embodiment.

The pipe 200 of the present embodiment temporarily stores the remaining fuel used in the engine 100 and the fuel oil stored in the pipe 200 is removed by the air removing device 210 And the air removed by the air removing device 210 is discharged to the outside.

The fuel oil from which air has been removed by the air removing device 210 is sent to the circulating pump 700 and used again as fuel for the engine as in the first embodiment.

When the fuel oil supply system of the present embodiment includes the pipe 200, the first valve (not shown) installed on the line from which the fuel oil is sent from the pipe 200 to the storage tank 300 10).

The first valve 10 of this embodiment is normally kept closed as in the first embodiment and opens when the amount of fuel oil in the pipe 200 becomes too large (third measured value) So that fuel oil can be sent from the pipe 200 to the storage tank 300.

When the fuel oil supply system of the present embodiment includes the pipe 200 as in the first embodiment, the fuel oil supply system of the present embodiment is branched from the pipe 200 and the engine 100 and flows between the pipe 200 and the storage tank 300 And may further include a bypass line L2, which is joined.

When the present embodiment includes the bypass line L2, the fuel oil remaining and used in the engine 100 may be sent to the pipe 200, bypassed the pipe 200 and bypassed by the bypass line L2 And the bypass line L2 is not normally used and is used when the fuel oil is replaced or when the pipe 200 is damaged and can not be used.

The fuel oil supply system of the present embodiment may further include a flow meter 600 installed between the pressurizing tank 500 and the engine 100 to measure the flow rate of the fuel oil, as in the first embodiment.

The fuel oil supply system of the present embodiment of the present invention may further include a filtration device 900 installed at the front end of the engine 100 to filter out impurities mixed with fuel oil sent to the engine 100 as in the first embodiment have.

However, unlike the first embodiment, the fuel oil supply system of the present embodiment differs from the first embodiment in that the fuel oil supply system of the present embodiment is branched from the line between the supply pump 400 and the pressurization tank 500, And does not include the return line L1 joined to the line.

According to the present invention, when the engine 100 is operated in the fuel oil mode, since the fuel oil stored in the pressurizing tank 500 is preferentially used and the supply pump 400 is not always operated, It is not necessary to continuously supply the fuel oil at the flow rate necessary for operating the supply pump 400 irrespective of the flow rate of the fuel supplied to the return line L1 after the fuel oil that has not been used in the engine 100 is compressed by the supply pump 400, It is not necessary to circulate it.

Therefore, according to the present invention, there is no problem even if the return line L1 is not provided as in the prior art, and according to the present embodiment, the return line L1 can be omitted, thereby simplifying the system.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention. It is.

Claims

A method of supplying fuel oil to a ship, which supplies fuel oil to an engine using both natural gas and fuel oil as fuel,

Compressed air is supplied to the pressurized tank to store the fuel oil in a pressurized state,

When the engine is operated in the fuel oil mode, the fuel oil stored in the pressurizing tank is supplied to the circulation pump,

The fuel oil pressurized by the circulation pump is adjusted to a temperature required by the engine by a temperature regulating device,

And the fuel oil having passed through the temperature control device is supplied to the engine.
The method according to claim 1,

And when the fuel oil stored in the pressurizing tank does not satisfy the required amount of the engine, the fuel oil stored in the storage tank is pressurized by the supply pump and supplied to the engine.
The method of claim 2,

Wherein the fuel oil stored in the storage tank is pressurized by the supply pump and supplied to the pressurizing tank when the amount of fuel oil in the pressurizing tank becomes equal to or less than the first measured value.
The method according to claim 2 or 3,

Wherein the remaining fuel oil used in the engine is temporarily stored in a pipe and is sent to the circulation pump after air is removed.
The method of claim 4,

Wherein the fuel oil stored in the pipe is sent to the storage tank when the amount of the fuel oil in the pipe becomes equal to or greater than a third measured value.
The method of claim 4,

And the remaining fuel used in the engine is bypassed to the storage tank.
The method of claim 2,

Wherein the fuel oil discharged from the pressurizing tank is prevented from flowing backward in the direction of the supply pump.
A fuel oil supply system for a ship, which supplies fuel oil to an engine using both natural gas and fuel oil as fuel,

A storage tank for storing fuel oil supplied to the engine;

A supply pump for pressurizing the fuel oil discharged from the storage tank;

A pressurization tank installed at a downstream end of the feed pump to receive compressed air and store fuel oil in a pressurized state;

A circulation pump installed at a downstream end of the pressurizing tank to pressurize fuel oil; And

And a temperature regulating device installed at a downstream end of the circulation pump to regulate the fuel oil pressurized by the circulation pump to a temperature required by the engine,

Wherein when the engine is operated in the fuel oil mode, fuel oil stored in the pressurizing tank is preferentially supplied to the engine.
The method of claim 8,

Further comprising a return line branching from the line between the supply pump and the pressurization tank and merging into a line between the supply pump and the storage tank,

Wherein the fuel oil not used in the engine of the fuel oil compressed by the supply pump is circulated by the return line.
The method of claim 9,

Wherein the return line includes a heat radiating line.
The method of claim 8,

The circulation pump includes:

Fuel oil discharged from the pressurizing tank; or

A fluid in which the fuel oil discharged from the pressurizing tank and the fuel oil compressed by the supply pump are merged;

The fuel supply system of the ship.
The method of claim 8,

Further comprising a water level detector installed inside the pressure tank for measuring an amount of fuel oil stored in the pressure tank,

Wherein the level detector activates the feed pump by sending a signal to the feed pump when the measured amount of fuel oil is less than or equal to a first measurement value, To stop the operation of the feed pump,

Wherein the supply pump pressurizes the fuel oil discharged from the storage tank and supplies the fuel oil to the pressurization tank when the amount of fuel oil measured by the water level detector is equal to or less than the first measurement value.
The method of claim 8,

A pipe for temporarily storing the remaining fuel used in the engine; And

And an air removing device for removing air contained in the fuel oil temporarily stored in the pipe,

And the fuel oil from which the air is removed by the air removing device is sent to the circulation pump.
14. The method of claim 13,

Further comprising: a first valve that opens when the amount of fuel oil in the pipe becomes equal to or greater than a third measured value, and sends fuel oil stored in the pipe to the storage tank.
14. The method of claim 13,

Further comprising a bypass line that branches off between the pipe and the engine and merges between the pipe and the storage tank,

And the fuel oil is supplied to the storage tank by bypassing the pipe by the bypass line.
The method of claim 8,

Further comprising a flow meter installed at the feed pump and at a downstream end of the pressurizing tank for measuring a flow rate of fuel oil supplied to the engine.
The method of claim 8,

Further comprising a filtration device installed at a front end of the engine for filtering out impurities mixed with fuel oil sent to the engine.
The method according to any one of claims 8 to 17,

And a fifth valve installed between the supply pump and the pressurizing tank to prevent fuel oil discharged from the pressurizing tank from flowing back to the supply pump.
When the engine is driven in the fuel oil mode, the fuel oil stored in the pressurized state in a pressurized state is preferentially supplied to the engine,

Wherein the fuel oil stored in the storage tank is pressurized by the supply pump and supplied to the engine when the fuel oil stored in the pressurized state is insufficient.