KR20150063259A - Fuel supply system and ship including the same and fuel supply method - Google Patents

Abstract

Disclosed are a fuel supply system, a ship having the same, and a fuel supply method. According to an embodiment of the present invention, the fuel supply system may comprise: a storage tank wherein liquefied fuel is pressurized at predetermined pressure to be stored; a booster pump connected to the storage tank to pump the liquefied fuel to the outside; a suction drum connected to the booster pump to store the pumped liquefied fuel; a high pressure pump connected to the suction drum to compress the liquefied fuel; a first vaporizer connected to the high pressure pump to vaporize the liquefied fuel; a first engine supplied with the liquefied fuel vaporized from the first vaporizer; a second vaporizer connected to the booster pump; and a second engine connected to the second vaporizer and driven by being supplied with fuel which has lower pressure than fuel supplied to the first engine.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a fuel supply system,

The present invention relates to a fuel supply system and a ship including the fuel supply system and a fuel supply method.

Vessels can be propelled using liquefied natural gas as fuel. For this purpose, ships may be equipped with liquefied natural gas storage tanks for storing liquefied natural gas for fuel.

The propulsion engine of such a ship uses a gas compressed at a high pressure, for example, 250 bar or more, and a low pressure gas, for example, an engine using a gas of 5 bar to 10 bar as fuel (hereinafter referred to as a "low pressure gas injection engine" (Hereinafter referred to as "high-pressure gas injection engine").

When the ME-GI engine (a product of NAN B & W diesel) among high-pressure gas injection engines using high-pressure fuel gas is used, the low-pressure liquefied natural gas stored in the storage tank is compressed and vaporized at a high pressure, .

Further, when a low-pressure gas injection engine using a low-pressure fuel gas is used, the liquefied natural gas stored in the storage tank is vaporized to supply fuel to the low-pressure gas injection engine. In this case, The liquefied natural gas stored in the tank may not be further compressed or compressed.

In this case, when the low-pressure gas injection engine and the high-pressure gas injection engine are installed together in the vessel, since the pressures required by the respective engines are different, the fuel storage tanks may be separately provided so as to supply fuel to the respective engines, A complex system is required to change the pressure of the supplied fuel.

An embodiment of the present invention provides a fuel supply system, a ship, and a fuel supply method capable of stably supplying fuel to each engine from a ship or suspended body provided with a high-pressure gas injection engine and a low-pressure gas injection engine while simplifying the system .

According to an aspect of the present invention, there is provided a booster pump comprising: a storage tank in which liquefied fuel is pressurized and stored at a predetermined pressure; a booster pump connected to the storage tank for pumping the liquefied fuel to the outside; A high pressure pump connected to the suction drum for compressing the liquefied fuel; a first vaporizer connected to the high pressure pump to vaporize the liquefied fuel; a first vaporizer connected to the suction drum to compress the liquefied fuel; A second engine connected to the booster pump and connected to the second vaporizer, the second engine being connected to the second engine, the second engine being connected to the booster pump, the second engine being connected to the booster pump, The fuel supply system may be provided.

Also, the suction drum may further include a high-pressure pump for supplying a high-pressure fluid to the second vaporizer, the high-pressure pump having a relatively higher flow rate than the required flow rate of the second vaporizer so that a flow rate corresponding to a required flow rate of the second vaporizer among the liquefied fuel pumped by the booster pump can be delivered to the second vaporizer. The required flow rate of the pump can be buffered.

The booster pump may further include a first connection pipe connected to a lower portion of the storage tank, wherein the booster pump is installed outside the storage tank and may be connected to the first connection pipe.

The booster pump may further include a first bypass pipe bypassing the booster pump and connecting the first connection pipe and the second vaporizer.

The apparatus may further include a first pressure control pipe connecting the second connection pipe between the second vaporizer and the second engine and the storage tank.

The booster pump may further include a second pressure control pipe connecting the third connection pipe between the booster pump and the suction drum and the storage tank.

The apparatus may further include a third pressure control pipe connecting the suction drum and the storage tank.

The suction drum may further include a second bypass pipe connected to the suction drum and the second vaporizer.

According to another aspect of the present invention, a vessel including the fuel supply system described above can be provided.

Here, the second engine of the ship may be a heterogeneous fuel engine.

According to another aspect of the present invention, there is provided a method of supplying fuel to a high pressure gas injection engine and a low pressure gas injection engine of a ship, comprising the steps of: (a) pumping liquefied fuel compressed and stored at a pressure set in a storage tank of the ship Pressure gas injection engine so that the amount corresponding to the required flow rate of the high-pressure gas-injection engine is stored in a buffer tank provided in the ship, (C) vaporizing the remaining of the pumped liquefied fuel and supplying it to the low-pressure gas injection engine, wherein the high-pressure gas injection engine is not driven , The step (a) and the step (b) are not performed, and the step (c) includes the step of using the liquefied fuel sent to the internal pressure of the storage tank There is a fuel supply method may be provided.

In addition, when the internal pressure of the storage tank is higher than a set pressure, a part of the liquefied fuel pumped in the step (a) is sprayed onto the storage tank to re-liquefy the vaporized liquefied fuel on the upper side of the storage tank, And reducing the internal pressure of the storage tank.

The method may further include supplying the vaporized liquefied fuel in the buffer tank to the storage tank to increase the internal pressure of the storage tank when the internal pressure of the storage tank is lower than a predetermined pressure.

In addition, if the internal pressure of the storage tank is lower than a set pressure, the step (c) may further include supplying a part of the liquefied fuel vaporized in the step (c) to the storage tank to increase the internal pressure of the storage tank .

The fuel supply system according to the embodiment of the present invention can stably supply the fuel gas to the engine using the high pressure gas as the fuel and the engine using the low pressure gas as the fuel.

1 and 2 are schematic diagrams showing a fuel supply system according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art to which the present invention pertains. The present invention may be embodied in many different forms and is not limited to the embodiments described herein.

In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same or similar components are denoted by the same reference numerals throughout the specification.

Throughout the specification, when a part is referred to as being "connected" to another part, it includes not only "directly connected" but also "indirectly connected" between other parts. Also, when a part is referred to as "including " an element, it does not exclude other elements unless specifically stated otherwise.

1 and 2, a valve may be provided in each pipe, and a flow rate of the liquefied fuel or vaporized liquefied fuel that can be flowed to the corresponding pipe by controlling each valve And pressure can be controlled by a person skilled in the art, so that detailed description is omitted.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel supply system, and more particularly, to a fuel supply system installed in a ship to supply fuel to an engine.

The fuel supply system according to the embodiment of the present invention can be applied not only to a liquefied fuel carrier having a liquefied fuel storage tank for transporting liquefied fuel, a container ship including an engine using liquefied fuel as a fuel, For example, it can be installed on floating floating structures such as SRV (Shipboard Regasification Vessel), SRU (Sulfur Recovery Unit), and FSRU (floating storage regasification unit) to supply fuel.

Therefore, the fuel supply system of the present invention is not limited to the name and use of a ship or a marine structure, but may be a tank for storing a liquefied fuel usable as fuel, a vessel capable of having an engine using liquefied fuel as fuel, If it is a marine structure, it can be applied to all.

Liquefied fuel But is not limited to, any one of liquefied natural gas (LNG), liquefied petroleum gas (LPG), and dimethyl ether (DME). Hereinafter, for convenience of explanation, it is assumed that the liquefied fuel is liquefied natural gas (LNG).

Hereinafter, the name of the vessel will be described for convenience of explanation, but the object to which the fuel supply system according to the embodiment of the present invention is applied is not limited to the "vessel"

Hereinafter, a fuel supply system according to an embodiment of the present invention will be described in detail with reference to FIGS. 1 and 2. FIG.

1 and 2 are schematic views of a fuel supply system according to an embodiment of the present invention, in which the flow of fuel is shown in Fig. 1 and the flow of fluid for internal pressure control is shown in Fig. 2 have.

Referring to FIG. 1, a fuel supply system 1000 according to an embodiment of the present invention is a fuel supply system 1000 that is installed in a ship and supplies fuel gas to an engine 500, 600 of a ship, A booster pump 210 connected to the storage tank 100; a suction drum 250 connected to the booster pump 210; a high-pressure pump 270 connected to the suction drum 250; A first vaporizer 290 connecting the pump 270 and the first engine 500 and a second vaporizer 350 connected between the booster pump 210 and the second engine 600.

The storage tank 100 may be a storage tank for storing liquefied natural gas, for storing liquefied natural gas in a liquefied natural gas carrier, or a liquefied natural gas storage tank, which is a fuel for use in an engine. The storage tank 100 maintains a temperature of approximately -163 占 폚 in order to liquefy and store the natural gas.

At this time, according to one embodiment of the present invention, the storage tank 100 can store the liquefied natural gas therein while being maintained at a pressure higher than atmospheric pressure as a pressurized tank.

The booster pump 210 is located outside the storage tank 100 and pumps the liquefied natural gas inside the storage tank 100 to the outside. At this time, the booster pump 210 may be connected to a lower portion of the storage tank 100, for example, a first connection pipe L9 installed below the liquefied natural gas water surface in the storage tank or on the bottom surface of the storage tank.

According to an embodiment of the present invention, a first connection pipe L9 is installed at a lower portion of the storage tank 100 and connected to a booster pump 210 located outside the storage tank 100, The pumping efficiency of the booster pump 210 can be increased since the liquefied natural gas in the booster pump 210 is directly introduced into the booster pump 210. [

That is, conventionally, in order to pump liquefied natural gas to the outside of the storage tank, a booster pump is located inside the storage tank. In this case, the booster pump is placed in a state of being submerged in the liquefied natural gas in the storage tank, Pumped in the upper direction of the tank, and discharged after passing through the upper part of the storage tank to the outside of the storage tank.

However, since the liquefied natural gas passes through the upper portion of the storage gas filled with the vaporized gas while the liquefied natural gas is moved to the upper portion of the storage tank through the pipe in the storage tank, A part of the liquefied natural gas passing through the piping by heat exchange with the vaporized gas can be vaporized in the piping.

When the liquefied natural gas is vaporized in the piping through which the liquefied natural gas passes, the pumping efficiency is lowered as much as the vaporized gas, so that more power may be consumed for pumping.

Compared with this, in the fuel supply system according to the embodiment of the present invention, since the liquefied natural gas discharged through the piping connected to the lower part of the storage tank 100 is pumped through the booster pump 210 without heat exchange with the vaporized gas, The pumping efficiency of the first pump 210 can be increased. Thus, power consumption for pumping liquefied natural gas can be reduced.

Meanwhile, according to one embodiment of the present invention, the booster pump 210 may pump the fuel gas at approximately 5 bar to 10 bar. In this case, it is assumed that the booster pump is pushed to approximately 5 bar to 10 bar in the present specification. However, this is only for the convenience of understanding and explanation of the present invention, And can be variously changed.

The liquefied natural gas in the storage tank 100 may be pumped by the booster pump 210 and supplied to the suction drum 250 through the first connection pipe L4.

The suction drum 250 receives the liquefied natural gas pumped from the booster pump 210 and temporarily stores the liquefied natural gas. The suction drum 250 may perform a function of a buffer tank for storing a predetermined amount of liquefied natural gas and stably supplying liquefied natural gas to the high pressure pump 270 connected to the suction drum 250.

The inside of the suction drum 250 may be pressurized to a pressure of atmospheric pressure or higher, for example, to a pressure of 5 to 10 bar, similar to the delivery pressure of the booster pump 210.

More specifically, the pressure in the suction drum 250 considers the delivery pressure of the booster pump 210, the required flow rate of the high-pressure pump 270 connected to the suction drum 250, and the amount of gasified gas in the suction drum 250 And can be controlled at various setting pressures.

The high pressure pump 270 is for boosting the pressure of the liquefied natural gas delivered from the suction drum 250 to a high pressure and boosts the liquefied natural gas at a high pressure of 250 to 300 bar according to an embodiment of the present invention. Here, the high-pressure pump 270 may be variously configured according to the environment to which the present invention is applied.

For example, the high-pressure pump 270 is connected to a plurality of pumps in a multi-stage manner to sequentially compress the liquefied natural gas and send it to the required pressure of the first engine 500.

For example, the high-pressure pump is constituted by a single pump, so that the liquefied natural gas can be compressed to a high pressure and sent to the required pressure of the first engine 500.

For example, the high-pressure pump 270 may be configured such that two pumps are connected in parallel. In this way, in the state where two pumps are connected in parallel, one pump is used as a main pump, and generally can be used for high pressure compression of liquefied natural gas, and the other pump is used for a preliminary case, Can be used.

The first vaporizer 290 exchanges high-pressure liquefied natural gas delivered from the high-pressure pump 270 with a heating medium as a high-pressure vaporizer to vaporize the liquefied natural gas and deliver it to the first engine 500. The first vaporizer 290 can be of various known configurations.

For example, the first vaporizer 290 may be a heater.

For example, the first vaporizer 290 may use seawater, fresh water, glycol water, or the like as a raw material. The first engine 500 may be, for example, a high pressure gas injection engine (e. G., ME-GI engine) operated by a high pressure fuel of at least 250 bar, Natural gas is used as fuel.

The liquefied natural gas is supplied to the second vaporizer 350 through the second connection pipe L5 branched from the first connection pipe L4 while passing through the first connection pipe L4 by the booster pump 210 . A valve may be provided in the first connection pipe L4 to adjust the supply amount of the liquefied natural gas to be supplied to the second vaporizer 350 through the second connection pipe L5.

The second vaporizer 350 vaporizes the liquefied natural gas delivered from the booster pump 210 as a low-pressure vaporizer.

At this time, the liquefied natural gas can be transferred to the second engine 600 by vaporizing the liquefied natural gas by heat exchange with the heating medium.

Here, the second vaporizer 350 may be a heater similar to the first vaporizer 290 described above, or may use seawater, fresh water, or glycol water as a boiling means, as is known in the art.

The second engine 600 may be a low-pressure gas injection engine that can be driven with low pressure, for example, 5 bar to 10 bar of fuel.

Also, according to an embodiment of the present invention, the second engine 600 may be a dual fuel engine (DF engine) which can be driven by heavy oil and gas.

Further, the second engine 600 may be a power generation engine for supplying electricity required for the ship, and may also be used as a propulsion engine if necessary.

According to an embodiment of the present invention, for the pressure control within the storage tank 100, the above-described arrangement and the storage tank 100 can be variously connected.

For example, the third connection pipe L6 between the second vaporizer 350 and the second engine 600 may be connected to the storage tank 100 and the first pressure control pipe L1.

For example, the first connection pipe L4 between the booster pump 210 and the suction drum 250 may be connected to the storage tank 100 and the second pressure control pipe L2.

For example, the storage tank 100 and the suction drum 250 may be connected to the third pressure control pipe L3.

At this time, the flow rate of each of the first to third pressure regulating pipes L1, L2, L3 can be controlled by a valve, wherein the flow rate control is manually controlled by an operator or by other known control means Can be automatically controlled.

The above-mentioned first to third pressure control pipes L1, L2 and L3 will be described later in detail with reference to Fig.

Hereinafter, a fuel supply method of the fuel supply system according to an embodiment of the present invention will be described in detail with reference to FIG.

According to the fuel supply method of the fuel supply system according to the embodiment of the present invention, the liquefied natural gas stored in the storage tank 100 is boosted by the booster pump 210 and stored primarily in the suction drum 250 Pressure pump 250 to the high pressure, and then the vaporized gas is supplied to the first engine 500 by the first vaporizer 290. [ The liquefied natural gas stored in the storage tank 100 may be boosted by the booster pump 210 and transferred to the second vaporizer 350 (refer to a dotted line B) and vaporized in the second vaporizer to be supplied to the second engine 600 have.

Here, the suction drum 250 according to the embodiment of the present invention can function as a kind of buffer tank. More specifically, the suction drum 250 is connected to the second vaporizer 350 so that the flow rate corresponding to the required flow rate of the second vaporizer 350 among the liquefied natural gas pumped by the booster pump 210 can be sent to the second vaporizer 350. It is possible to perform the function of the buffer tank for buffering the required flow rate of the high-pressure pump 270, which is relatively larger than the required flow rate of the vaporizer 350.

If the suction drum 250 according to the embodiment of the present invention is not provided, the flow rate required by the high-pressure pump 250 is relatively larger than the flow rate required by the second vaporizer 250, The liquefied natural gas can be introduced into the high-pressure pump 270 only. In this case, the amount of the liquefied natural gas flowing into the second vaporizer 350 is relatively small, or the second engine 600 can not be driven.

Accordingly, the suction drum 250 according to the embodiment of the present invention is a buffer tank for storing a constant flow rate of the liquefied natural gas pumped by the booster pump 210, and has a constant flow rate corresponding to the required flow rate of the high pressure pump 270 And is stably supplied to the high-pressure pump 270. In addition, the suction drum 250 can buffer the required flow rate of the high-pressure pump 270, which is relatively larger than the required flow rate of the second vaporizer 350, A predetermined flow rate corresponding to the required flow rate of the second vaporizer 350 may be sent to the second vaporizer 350.

Here, the pressure inside the suction drum 250 may be variously set in consideration of the delivery pressure of the booster pump 210, the required flow rate of the high-pressure pump 270, and the control of the amount of internal gasified gas.

The internal pressure of the suction drum 250 according to the embodiment of the present invention is relatively small as compared with the pressure at the rear end of the high pressure pump 270, so that it can be easily managed.

According to the embodiment of the present invention, the booster pump 210 is not selectively driven, so that power consumption can be reduced.

Hereinafter, this will be described in detail with reference to Fig.

According to the embodiment of the present invention, there may be a case where the second engine 600 is driven without driving the first engine 500.

For example, when the ship is anchored at a quay or at a specific place and does not need a propulsion engine to drive the first engine, or when the first engine 500 fails or the first engine 500 ) May not be driven.

The fuel supply system according to the embodiment of the present invention may include a first bypass pipe L7 bypassing the booster pump 210 and connecting the storage tank 100 and the second vaporizer 350. [

The storage tank 100 according to the embodiment of the present invention may be a pressurized tank for storing liquefied natural gas by pressurizing with a predetermined pressure.

Therefore, when the second engine 600 is driven without driving the first engine 500, the booster pump 210 may not be driven and the first bypass pipe L7 may be used (dotted line C) So that the liquefied natural gas can be delivered to the second vaporizer 350 by the internal pressure of the storage tank 100. In this case, since the booster pump 210 is not driven, the power consumption can be reduced.

Here, the pressure inside the storage tank 100 is controlled in a manner similar to the delivery pressure of the booster pump 210 or the required pressure of the second engine, as described above.

However, when the internal pressure of the storage tank 100 is controlled to be lower than the delivery pressure of the booster pump 210 or the required pressure of the second engine, the booster pump 210 boosts the liquefied natural gas to the second vaporizer 350 It can also be sent out.

The fuel supply system according to the embodiment of the present invention may further include a second bypass pipe L8 connecting the suction drum 250 and the second connection pipe L5, The liquefied natural gas can be supplied directly to the second vaporizer 350.

As described above, the internal pressure of the suction drum 250 can be variously set according to the delivery pressure of the booster pump 210, the required flow rate of the high-pressure pump 270, and the amount of internal vaporization gas of the suction drum 250 Described above.

Here, when the internal pressure of the suction drum 250 is higher than the required pressure of the second engine 600, the liquefied natural gas is directly supplied to the second vaporizer 350 from the suction drum to vaporize the liquefied natural gas, It is also possible to supply the fuel to the fuel cell 600. At this time, it is obvious to a person skilled in the art that a valve is provided in the second bypass pipe L8 to control the flow rate and pressure supplied to the second vaporizer 350, and a detailed description thereof will be omitted.

Meanwhile, the inside of the storage tank 100 must maintain a constant pressure, but the internal pressure may be changed due to changes in external environment and boil off gas (BOG).

The fuel supply system according to the embodiment of the present invention can control the pressure in order to keep the internal pressure of the storage tank 100 constant when the internal pressure is changed.

Hereinafter, a method of controlling the pressure inside the storage tank 100 in the fuel supply system according to an embodiment of the present invention will be described in detail with reference to FIG.

Referring to FIG. 2, when the internal pressure of the storage tank 100 increases and the internal pressure of the storage tank 100 rises above the set internal pressure, the liquefied natural gas pumped by the booster pump 210 is returned through the second pressure control pipe L2 The internal pressure can be lowered to the set internal pressure by injecting into the storage tank 100 (see dotted line D).

That is, when the pumped liquefied natural gas is sprayed in the upper part of the storage tank 100 through the second pressure control pipe L2, the low temperature of the injected liquefied natural gas causes the vaporized gas in the storage tank to be re- Thereby reducing the volume of the gasified gas, thereby lowering the pressure inside the storage tank 100.

Conversely, when the internal pressure of the storage tank 100 is lower than the set internal pressure, the vaporized gas in the suction tank 250 is injected into the storage tank 100 (see the dotted line E) through the third pressure control pipe L3 The natural gas discharged from the second vaporizer 250 can be injected into the storage tank 100 through the first pressure control pipe L1 to increase the internal pressure to a set internal pressure.

In this case, according to an embodiment of the present invention, when the set internal pressure of the suction tank 250 is similar to that of the storage tank 100, the vaporized gas is directly injected into the storage tank 100 without any pressure change, The internal pressure of the main body 100 can be raised to the set internal pressure. If the pressure of the natural gas discharged to the second vaporizer 250 is similar to the set internal pressure of the storage tank 100, the natural gas is directly injected into the storage tank 100 without any pressure change, The pressure can be increased.

As described above, by using the fuel supply method according to one embodiment of the present invention, the pressure inside the storage tank can be kept constant, so that liquefied natural gas can be stably supplied to the first engine or the second engine .

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, And are not used to limit the scope of the present invention described in the scope. Therefore, those skilled in the art will appreciate that various modifications and equivalent embodiments are possible without departing from the scope of the present invention. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

100: Storage tank 210: Booster pump
250: Suction drum 270: High pressure pump
290: First vaporizer 350: Second vaporizer
500: First engine 600: Second engine
1000: Fuel supply system
L1: First pressure control pipe
L2: Second pressure control pipe
L3: Third pressure control pipe
L4, L5, L6, L9: Connection piping
L7, L8: Bypass piping

Claims (14)

A storage tank in which liquefied fuel is pressurized and stored at a predetermined pressure,
A booster pump connected to the storage tank for pumping the liquefied fuel to the outside,
A suction drum connected to the booster pump and storing the pumped liquefied fuel;
A high pressure pump connected to the suction drum for compressing the liquefied fuel,
A first vaporizer connected to the high-pressure pump to vaporize the liquefied fuel,
A first engine that receives the liquefied fuel vaporized from the first vaporizer as fuel,
A second vaporizer connected to the booster pump,
And a second engine connected to the second vaporizer and driven by being supplied with fuel at a lower pressure than the fuel supplied to the first engine.
The method according to claim 1,
Wherein the suction drum is provided with a suction pump that is connected to the suction pump so that a flow rate corresponding to a required flow rate of the second vaporizer among the liquefied fuel pumped by the booster pump can be delivered to the second vaporizer, A fuel supply system that cushions the required flow rate.
The method according to claim 1,
Further comprising a first connection pipe connected to a lower portion of the storage tank,
Wherein the booster pump is installed outside the storage tank and connected to the first connection pipe.
The method of claim 3,
Further comprising a first bypass pipe bypassing the booster pump and connecting between the first connecting pipe and the second vaporizer.
5. The method according to any one of claims 1 to 4,
Further comprising a first pressure control pipe connecting between the second connection pipe between the second vaporizer and the second engine and the storage tank.
5. The method according to any one of claims 1 to 4,
And a second pressure regulating pipe connecting the third connecting pipe between the booster pump and the suction drum and the storage tank.
5. The method according to any one of claims 1 to 4,
And a third pressure regulating pipe connecting the suction drum and the storage tank.
5. The method according to any one of claims 1 to 4,
Further comprising a second bypass pipe connected to the suction drum and the second vaporizer,
A storage tank in which liquefied fuel is pressurized and stored at a predetermined pressure,
A booster pump connected to the storage tank for pumping the liquefied fuel to the outside,
A suction drum connected to the booster pump and storing the pumped liquefied fuel;
A high pressure pump connected to the suction drum for compressing the liquefied fuel,
A first vaporizer connected to the high-pressure pump to vaporize the liquefied fuel,
A first engine that receives the liquefied fuel vaporized from the first vaporizer as fuel,
A second vaporizer connected to the booster pump,
And a second engine connected to the second vaporizer and driven by being supplied with fuel at a lower pressure than the fuel supplied to the first engine,
A first bypass pipe connecting the lower portion of the storage tank and the booster pump, a first bypass pipe bypassing the booster pump and connecting the first connection pipe and the second vaporizer, A second pressure regulating pipe connecting the third connecting pipe between the booster pump and the suction drum and the storage tank, a second pressure regulating pipe connecting the second connecting pipe between the suction drum and the suction tank, And a second bypass pipe connected to the suction drum and the second vaporizer, and a fuel supply system including the fuel supply system.
10. The method of claim 9,
And the second engine is a heterogeneous fuel engine.
A method for supplying fuel to a high pressure gas injection engine and a low pressure gas injection engine of a ship,
(a) pumping liquefied fuel stored in a storage tank of the ship under a predetermined pressure,
(b) storing a part of the pumped liquefied fuel in a buffer tank provided in the ship, and then increasing the amount corresponding to the required flow rate of the high-pressure gas injection engine to correspond to a required pressure of the high-pressure gas injection engine, To the high-pressure gas injection engine;
(c) vaporizing the remaining of the pumped liquefied fuel and supplying it to the low-pressure gas injection engine,
Wherein the step (a) and the step (b) are not performed when the high-pressure gas injection engine is not driven, and the step (c) Way.
12. The method of claim 11,
Wherein a portion of the liquefied fuel pumped in the step (a) is sprayed onto the upper portion of the storage tank to re-liquefy the vaporized liquefied fuel on the upper side of the storage tank, Further comprising the step of reducing the internal pressure of the fuel.
12. The method of claim 11,
And supplying the vaporized liquefied fuel inside the buffer tank to the storage tank to raise the internal pressure of the storage tank when the internal pressure of the storage tank is lower than the set pressure.
12. The method of claim 11,
Further comprising the step of supplying a portion of the liquefied fuel vaporized in the step (c) to the storage tank to raise the internal pressure of the storage tank when the internal pressure of the storage tank is lower than the set pressure.

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