KR20230025126A - Fuel gas supply system and method for ship - Google Patents

Abstract

The present invention relates to a fuel gas supply system for a ship provided with an engine room at a stern of a hull to use fuel gas as fuel, comprising: a fuel supply line which is provided in a form of a single pipe from the outside of the engine room and through which fuel gas is moved; a gas double pipe connecting the fuel supply line and a main engine provided inside the engine room; a gas valve unit controlling fuel gas supplied to the main engine on the fuel supply line; and an outside air exchange part for exchanging air between an inner pipe and an outer pipe of the gas double pipe with outside air.

Description

Ship's fuel gas supply system and method {FUEL GAS SUPPLY SYSTEM AND METHOD FOR SHIP}

The present invention relates to a fuel gas supply system for ships, and more particularly, to a fuel gas supply system and method for ships using liquefied gas such as LNG as fuel.

A ship is a means of transportation that carries a large amount of minerals, crude oil, natural gas, or thousands of containers and navigates the ocean. It is made of steel and floats on the water surface by buoyancy. move

Light oil, heavy oil, MOD (Marine Diesel Oil), MFO (Marine Fuel Oil), etc., which are used as fuel for ships, cause environmental pollution due to a large amount of harmful substances generated in the combustion process.

Accordingly, as an eco-friendly ship, a ship that uses liquefied natural gas (hereinafter referred to as "LNG") as fuel (LNG Fueled Ship, hereinafter referred to as "LFS") has been developed and officially certified by the classification society of each country. It is meeting the demand for conversion to clean energy due to environmental regulations.

This LFS is not only environmentally friendly by reducing the generation of carbon dioxide, nitrogen oxides (NOx), sulfur oxides (SOx), etc., but also satisfies economic feasibility as the price per unit calorie of LNG is considerably lower than that of conventional ship fuel.

Recently, the application of LFS is expanding not only to LNG carriers that transport LNG as cargo, but also to a wider variety of ship types, such as container ships and tankers. and operations are expected to become more active.

As a ship propulsion engine, a ME-GI (Man Electric Gas Injection) engine or an X-DF (eXtra long stroke Dual Fuel) engine driven by receiving LNG as fuel may be applied.

The ME-GI engine is a 2-stroke high-pressure gas injection engine that can use both gas and oil as fuel, and is a diesel cycle that directly injects high-pressure natural gas around 300 bar into the combustion chamber near the top dead center of the piston. is adopting

The X-DF engine consists of a 2-stroke cycle, and compared to the ME-GI engine, relatively medium pressure (about 16 bar or less) of natural gas is injected into the combustion air inlet, and the piston rises to compress it. cycle) is used.

The foregoing technical configuration is a background technology for helping understanding of the present invention, and does not mean the prior art widely known in the technical field to which the present invention belongs.

Republic of Korea Patent Registration No. 10-1577804 "Vessel and Ship Arrangement Structure"

These ships are provided with a fuel gas supply system for supplying fuel gas as fuel, and the main engine used for propulsion of the ship is dangerous for gas in the lower part of the upper deck of the hull. It can be installed in an engine room (ER) classified as a hazardous area.

In addition, in order to control the supply of fuel gas supplied to the main engine, a gas valve unit (GVU) for the main engine is provided. This gas valve unit is disposed in a gas valve unit room separated from the engine room. do.

In the case of LFS using LNG as fuel, the gas piping passing through the engine room must be composed of a double walled pipe, and the space inside the double walled pipe, that is, between the inner pipe and the outer pipe, must be filled 30 times per hour. Ventilation should be performed by performing an air change.

In particular, according to the IGF code (International Code of Safety for Ships using Gases or low flashpoint Fuels) regarding the safety regulations of ships propelled by using gas as fuel, the ventilation air used for ventilation inside the double pipe is There is a requirement to use air outside the engine room (i.e., outside air) such as the cargo area instead of air by suction or supply.

However, although ventilation air has been sucked from the outside of the main engine used for propulsion, there is a concern that condensate water may be generated due to the temperature difference between the gas fuel flowing inside the double pipe and the outside air. Conventionally, such condensate water A drain trap is installed to separate and discharge separately.

In addition, a ventilation fan for discharging the air inside the double pipe to the outside is additionally installed in addition to the ventilation fan for ventilating the air inside the gas valve unit room.

The present invention is a fuel gas supply system and method for a ship that can minimize the installation of equipment for internal ventilation of a double pipe in an LFS using LNG as a propellant fuel and prevent condensate from being generated in the ventilation process. is intended to provide

According to one aspect of the present invention, a fuel gas supply system for a ship in which an engine room is provided at the stern of the hull to use fuel gas as fuel, is provided in a single pipe form outside the engine room and fuel gas moves to the inside a fuel supply line; a gas double pipe connecting the fuel supply line and the main engine provided inside the engine room; a gas valve unit controlling fuel gas supplied to the main engine on the fuel supply line; And it may be provided with a fuel gas supply system for a ship including an outside air exchange unit for exchanging air between the inner tube and the exterior of the gas double pipe with outside air.

The outside air exchange unit may suck air inside the GVU room in which the gas valve unit is disposed, separated from the engine room, and supply the gas to the double pipe.

In addition, a ventilation line connected to the room ventilation fan on the upper deck to discharge the air inside the GVU room to the outside; and an outside air inlet formed at an upper end of the room exhaust duct communicated with the GVU room and through which outside air flows.

In addition, the ventilation line may extend from the room ventilation fan to the inner floor of the GVU room.

In addition, the outside air exchange unit may include a double pipe air intake line connected to the exterior of the gas double pipe in the GVU room and supplying air inside the GVU room to the gas double pipe; and a double pipe air discharge line having one end connected to the exterior of the gas double pipe in the engine room and the other end connected to the ventilation line to discharge air between the inner pipe and the exterior of the gas double pipe to the outside.

In addition, a room heater provided inside the GVU room to heat air inside the GVU room; and a temperature maintaining means installed on the double pipe air intake line to maintain the air supplied to the gas double pipe at a predetermined temperature or higher.

In addition, a first orifice valve provided in front of the temperature maintaining means on the double pipe air suction line to control the amount of air introduced into the double pipe air suction line may be further included.

In addition, it may further include a double tube middle wall partitioning the gas double tube into two spaces between the inner tube and the exterior of the gas double tube.

Also, the double pipe middle wall may be located close to the main engine in the gas double pipe.

In addition, the outside air exchange unit may include an engine air intake line branched from the double tube air intake line and connected to the main engine by bypassing the gas double tube; and an engine air discharge line for discharging air inside the main engine to the outside.

In addition, the double pipe air discharge line may be provided in communication with a space located relatively far from the main engine among the two spaces partitioned by the middle wall of the double pipe.

In addition, the engine air discharge line is connected to the exterior of the gas double pipe so that one end communicates with a space located close to the main engine among the two spaces partitioned by the middle wall of the double pipe, and the other end is connected to the double pipe air discharge line. can be connected to

In addition, a second orifice valve may be further included on a downstream side of a branching point of the engine air supply line on the double pipe air intake line and on the engine air intake line, respectively.

According to another aspect of the present invention, as a fuel gas supply method for a ship in which an engine room is provided at the stern of the hull to use fuel gas as fuel, a fuel supply line provided in a single pipe form outside the engine room and the fuel Fuel gas is supplied to the main engine through a gas double pipe connecting the supply line and the main engine provided inside the engine room, but the air inside the GVU room separated from the engine room and the gas valve unit is disposed is sucked into the gas valve unit. A method for supplying fuel gas to a ship supplying a gas double pipe may be provided.

The present invention includes an outside air exchange unit for exchanging air between the inner tube and the exterior of the gas double tube with outside air, so that even if fuel gas leaks in the inner tube of the gas double tube, it can have the effect of safely discharging it to the outside. .

In addition, when the outside air exchange unit sucks in the air inside the GVU room and supplies it to the gas double pipe, the inside air of the GVU room is heated through the room heater, so a separate trap is not required to remove the condensate inside the double pipe gas, and the condensate is Corrosion of the gas double pipe can be prevented by minimizing the generation.

In addition, it is possible to more reliably prevent condensate from being generated in the gas double pipe by maintaining the air supplied to the gas double pipe at a predetermined temperature or higher through a temperature maintaining means provided on the double pipe air supply line separately from the room heater.

In addition, by dividing the inner tube and the exterior of the gas double tube into two spaces by the middle wall of the double tube, and constructing ventilation lines in parallel in each partitioned space, the air inside the GVU room can flow in two directions, respectively. , can have sufficient flow and resistance.

In addition, since the inside of the gas double pipe can be exchanged with outside air through the ventilation line and room ventilation fan to ventilate the air inside the GVU room, a separate fan for ventilation of the gas double pipe is not required, and one gas is installed in the double pipe air intake line. Since only the detector can be installed, it can have the effect of reducing the volume.

In addition, orifice valves are placed on the double pipe air supply line and the engine air supply line, respectively, so that air flow for ventilation of the GVU room and ventilation of the gas double pipe can be adjusted as needed.

1 is a diagram schematically showing the configuration of a fuel gas supply system for a ship according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

First, in adding reference numerals to components of each drawing, it should be noted that the same components have the same numerals as much as possible even if they are displayed on different drawings.

In addition, in describing the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present invention, the detailed description will be omitted.

Preferred embodiments of the present invention will be described below, but the technical spirit of the present invention is not limited or limited thereto and can be modified and implemented in various ways by those skilled in the art, of course.

1 is a diagram schematically showing the configuration of a fuel gas supply system for a ship according to an embodiment of the present invention.

Referring to FIG. 1, an engine room (ER) is provided at the stern of the hull, and a main engine (ME) connected to a propulsion device to transmit power and generate propulsive force is provided inside the engine room (ER). do.

As the main engine (ME) of this embodiment, an ME-GI engine driven by receiving high-pressure LNG of 10 bar or more as fuel may be applied, but preferably, a relatively medium pressure (about 16 bar or less) than the ME-GI engine ) can be applied to the X-DF engine using fuel gas.

The present invention does not limit the type of engine disposed inside the engine room (ER), and all engines using natural gas such as LNG as fuel may be applicable.

The fuel gas supply system 100 of a ship according to an embodiment of the present invention includes a fuel supply line 110 through which fuel gas is moved to the inside, and fuel supplied to the main engine ME on the fuel supply line 110. The inside of the GVU room (GR) in which the gas valve unit 120 that controls gas, the gas double pipe 130 that connects the fuel supply line 110 and the main engine ME, and the gas valve unit 120 are disposed. It may include a ventilation line 140 for discharging air to the outside and a room exhaust duct 150 communicating with the GVU room GR to form a path through which outside air is introduced.

In this embodiment, the fuel supply line 110 may be provided in a single pipe form outside the engine room (ER) instead of inside the engine room (ER), and the gas valve unit 120 is separate from the engine room (ER). It may be provided in the partitioned GVU room (GR).

The GVU room (GR) is partitioned from the engine room (ER) defined as a gas danger zone and may be provided on the stern side (or bow side) of the engine room (ER) at the lower part of the upper deck (UD).

In the GVU room GR of this embodiment, a room heater 121 may be installed therein to maintain a temperature capable of operating the gas valve unit 120.

The gas double pipe 130 is for connecting the fuel supply line 110 and the main engine ME, and is formed to surround an inner pipe through which the fuel gas moves and the inner pipe, so that the air moves inside. (Outer pipe).

The gas double pipe 130 of this embodiment is provided inside the engine room (ER), and may be formed to extend long so that at least a part is located inside the GVU room (GR).

The ventilation line 140 is connected to the room ventilation fan 141 outside the hull, and may serve to discharge air inside the GVU room (GR) to the outside.

The room ventilation fan 141 is installed on the upper deck (UD), more specifically, on the B deck (BD) where the engine casing is disposed, and the ventilation line 140 of this embodiment is for room ventilation. It may be desirable to form a long extension from the fan 141 to the inner floor of the GVU room (GR).

The room exhaust duct 150 communicates with the GVU room GR to form a path through which outside air flows in, and an outside air inlet (not shown) may be protruded from the upper deck UD.

In this embodiment, the room exhaust duct 150 may be provided at the stern side of the GVU room (GR), and the area where the outside air inlet is formed on the upper deck (UD) is a non-hazardous opening with low risk of fuel gas explosion. It is a non-hazardous open area.

In addition, on the outside air inlet of this embodiment, a damper 151 serving as a flame screen may be additionally installed to prevent the spread of flame in the event of a fire on a ship.

On the other hand, as described above, the inside of the gas double pipe 130 disposed in the engine room ER, that is, the space between the inner pipe and the outer pipe, must be ventilated by exchanging air 30 times per hour.

The ship's fuel gas supply system 100 according to an embodiment of the present invention may further include an outside air exchange unit 160 for exchanging air between the inner tube and the exterior of the gas double pipe 130 with outdoor air.

The outside air exchange unit 160 includes a double pipe air intake line 161 connected to the exterior of the gas double pipe 130 inside the GVU room (GR) and supplying air inside the GVU room (GR) to the gas double pipe 130, One end is connected to the exterior of the gas double pipe 130 inside the engine room (ER) and the other end is connected to the ventilation line 140 to discharge air between the inner tube and the exterior of the double pipe 130 to the outside. line 163.

In this embodiment, a gas detector (GD) for detecting leakage of fuel gas may be installed on the double pipe air intake line 161.

Conventionally, gas detectors had to be installed at the inlet and outlet of the ventilation line of the gas double pipe 130, respectively, but the fuel gas supply system 100 of this embodiment has one gas detector (GD) in the double pipe air intake line 161 ) is additionally installed, and gas leakage in the double pipe air discharge line 163 can be detected through a gas detector GD provided in the ventilation line 140.

The ship's fuel gas supply system 100 according to an embodiment of the present invention is a gas double pipe 130 through an outside air exchange unit 160 for exchanging air between the inner pipe and the outer surface of the gas double pipe 130 with outside air. ), even if fuel gas leaks from the inner tube, it can have the effect of safely discharging it to the outside.

In addition, when the air inside the GVU room (GR) is sucked in and supplied to the gas double pipe 130, the air inside the GVU room (GR) is heated through the room heater 121, so condensate inside the gas double pipe 130 is removed. A separate trap is not required for this, and corrosion of the gas double pipe 130 can be prevented by minimizing the generation of condensed water.

In addition, the double pipe air discharge line 163 is connected to the ventilation line 140 for ventilating the air inside the GVU room, and the ventilation line 140 is connected to the room ventilation fan 141 outside the hull, so that the gas double pipe 130 ) does not require a separate fan for ventilation, and only one gas detector (GD) can be installed in the double pipe air intake line 161, so the volume can be reduced.

On the other hand, on the double pipe air intake line 161, apart from the room heater 121 provided inside the GVU room (GR), a temperature maintaining means 170 for maintaining the air supplied to the gas double pipe 130 at a predetermined temperature or higher is provided. may be provided.

In this embodiment, the temperature maintaining means 170 may include an electric heater that heats air using electricity separately from the room heater 121, and is installed in front of the gas detector GD. It can be.

As an example, when VOC (Volatile organic compound), which is converted to a liquid state at 40 ° C or less, is used as fuel oil, the temperature maintaining means 170 of the present embodiment maintains the fuel oil at 40 ° C or higher at all times, so that the gas It can serve to heat the air supplied to the double pipe air intake line 161 so that it can be in the state.

In the ship's fuel gas supply system 100 according to an embodiment of the present invention, gas is supplied to the double pipe through the temperature maintaining means 170 provided on the double pipe air supply line 161 separately from the room heater 121. It is possible to more reliably prevent condensate from being generated in the gas double pipe 130 by maintaining the air at a certain temperature or higher.

The fuel gas supply system 100 of this embodiment is provided at the front end of the temperature maintaining means 170 on the double pipe air intake line 161 to control the amount of air introduced into the double pipe air intake line 161. An orifice valve OV1 may be further included.

The first orifice valve (OV1) is provided on the double pipe air intake line 161 to control the flow of air for ventilation inside the GVU room (GR) and ventilation inside the gas double pipe 130, Air flow balancing can be maintained.

Referring to FIG. 1, two or more main engines ME of this embodiment are provided inside the engine room ER, through the first orifice valve OV1 provided on the double pipe air intake line 161, It may have an effect of preventing the flow of air from being generated only through the gas double pipe 130 connected to any one of these main engines ME.

On the other hand, in the fuel gas supply system 100 of this embodiment, although not shown in the drawings, a gas pipe through which fuel gas passes is provided inside the main engine ME, and the gas pipe is the same as the double gas pipe 130. It may consist of an inner tube through which the fuel gas passes and an exterior installed to surround the inner tube.

In this embodiment, the gas pipe provided inside the main engine (ME) may be provided by extending the gas double pipe 130 outside the main engine (ME) to the inside of the main engine (ME), As with the gas double pipe 130 provided on the outside, it should be possible to exchange air between the inner pipe and the outer air with the outside air.

In the fuel gas supply system 100 of this embodiment, the length of the double pipe air intake line 161 may be shortened by using the air inside the GVU room (GR) to ventilate the gas double pipe 130, but the main engine (ME ) In the case of using air inside the GVU room (GR) to ventilate the inside, the length from the GVU room (GR) to the main engine (ME) is relatively longer than in the case of a power generation engine (eg, DFGE engine), the main engine (ME) When connecting the gas double pipe 130 inside and outside into one, a large fan may be required for smooth ventilation.

In addition, the gas double pipe 130 located inside the main engine ME is disposed inside the main engine ME, which is relatively narrow compared to the gas double pipe 130 located outside the main engine ME. A pressure drop phenomenon in which the pressure temporarily drops may occur frequently, and this pressure drop may cause strain to the fan.

In the present invention, in ventilating by exchanging the air in the gas double pipe 130 with outside air, the space between the inner tube and the exterior of the gas double tube 130 is partitioned into two spaces, and ventilation lines are placed in parallel in each partitioned space. By configuring, by allowing the air inside the GVU room (GR) to flow in two directions, it is intended to have sufficient flow rate and resistance.

Specifically, the ship's fuel gas supply system 100 according to an embodiment of the present invention may further include a double pipe middle wall 131 dividing the gas double pipe 130 between an inner pipe and an outer pipe into two spaces. .

In addition, the outside air exchange unit 160 of this embodiment, the engine air intake line 165 branched from the double pipe air intake line 161, bypassing the gas double pipe 130 and connected to the main engine ME, An engine air discharge line 167 for discharging internal air of the engine ME to the outside may be further included.

In this embodiment, the double pipe middle wall 131 may be preferably located close to the main engine ME in the gas double pipe 130 in order to minimize the strain on the fan due to the pressure drop phenomenon described above. there is.

In addition, the double pipe air discharge line 161 may be provided in communication with a space located relatively far from the main engine ME among the two spaces partitioned by the double pipe middle wall 131.

The engine air discharge line 167 may be connected to the exterior of the gas double pipe 130 so that one end communicates with a space located close to the main engine ME among the two spaces partitioned by the double pipe middle wall 131, and other The end may be configured to be connected (or joined) to the double pipe air discharge line 163.

Ship's fuel gas supply system 100 according to an embodiment of the present invention, the downstream side of the branching point of the engine air supply line 165 on the double pipe air intake line 161, and the engine air intake line 165 A second orifice valve OV2 may be additionally installed on the top.

In this embodiment, the second orifice valve OV2 installed on the downstream side of the branching point of the engine air supply line 165 is air for ventilation of the gas double pipe 130 located inside and outside the main engine ME. It can play a role in controlling the flow of

The present invention includes an outside air exchange unit for exchanging air between the inner tube and the exterior of the gas double tube with outside air, so that even if fuel gas leaks in the inner tube of the gas double tube, it can have the effect of safely discharging it to the outside. .

In addition, when the outside air exchange unit sucks in the air inside the GVU room and supplies it to the gas double pipe, the inside air of the GVU room is heated through the room heater, so a separate trap is not required to remove the condensate inside the double pipe gas, and the condensate is Corrosion of the gas double pipe can be prevented by minimizing the generation.

In addition, it is possible to more reliably prevent condensate from being generated in the gas double pipe by maintaining the air supplied to the gas double pipe at a predetermined temperature or higher through a temperature maintaining means provided on the double pipe air supply line separately from the room heater.

In addition, by dividing the inner tube and the exterior of the gas double tube into two spaces by the middle wall of the double tube, and constructing ventilation lines in parallel in each partitioned space, the air inside the GVU room can flow in two directions, respectively. , can have sufficient flow and resistance.

In addition, since the inside of the gas double pipe can be exchanged with outside air through the ventilation line and room ventilation fan to ventilate the air inside the GVU room, a separate fan for ventilation of the gas double pipe is not required, and one gas is installed in the double pipe air intake line. Since only the detector can be installed, it can have the effect of reducing the volume.

In addition, orifice valves are placed on the double pipe air supply line and the engine air supply line, respectively, so that air flow for ventilation of the GVU room and ventilation of the gas double pipe can be adjusted as needed.

The above description is merely an example of the technical idea of the present invention, and those skilled in the art can make various modifications, changes, and substitutions without departing from the essential characteristics of the present invention. will be.

The embodiments disclosed in the present invention and the accompanying drawings are not intended to limit the technical idea of the present invention, but to explain, and the scope of the technical idea of the present invention is not limited by these embodiments and the accompanying drawings.

In addition, the protection scope of the present invention should be construed according to the claims below, and all technical ideas within the equivalent range should be construed as being included in the scope of the present invention.

100: fuel gas supply system
110: fuel supply line
120: gas valve unit
130: gas double pipe
140: ventilation line
141: room ventilation fan
143: room heater
150: room exhaust duct
151: damper
160: outside air exchange unit
161: double pipe air supply line
163: double pipe air discharge line
165: engine air supply line
167: engine air exhaust line
170: temperature maintenance means
UD: Upper deck
ER: engine room
ME: main engine
GR: GVU Room
OV1, OV2: Orifice valve
GD: gas detector

Claims (14)

As a ship's fuel gas supply system for using fuel gas as fuel with an engine room provided at the stern of the hull,
A fuel supply line provided in the form of a single pipe from the outside of the engine room and through which fuel gas is moved;
a gas double pipe connecting the fuel supply line and the main engine provided inside the engine room;
a gas valve unit controlling fuel gas supplied to the main engine on the fuel supply line; and
Ship's fuel gas supply system including an outside air exchange unit for exchanging air between the inner tube and the exterior of the gas double pipe with outside air. According to claim 1,
The outside air exchange unit,
A fuel gas supply system of a ship that is separated from the engine room and sucks air inside the GVU room in which the gas valve unit is disposed and supplies it to the gas double pipe. According to claim 2,
A ventilation line connected to a room ventilation fan on the upper deck to discharge the air inside the GVU room to the outside; and
The ship's fuel gas supply system further comprising an outside air inlet formed at an upper end of the room exhaust duct provided in communication with the GVU room and through which outside air flows. According to claim 3,
The ventilation line is
Ship's fuel gas supply system extending from the room ventilation fan to the inner floor of the GVU room. According to claim 3,
The outside air exchange unit,
a double pipe air intake line connected to the exterior of the gas double pipe from inside the GVU room to supply air inside the GVU room to the gas double pipe; and
One end is connected to the exterior of the gas double pipe in the engine room and the other end is connected to the ventilation line to discharge the air between the inner tube and the exterior of the gas double tube to the outside. supply system. According to claim 5,
a room heater provided inside the GVU room to heat air inside the GVU room; and
The ship's fuel gas supply system further comprises a temperature maintaining means installed on the double pipe air intake line to maintain the air supplied to the gas double pipe at a predetermined temperature or higher. According to claim 6,
The ship's fuel gas supply system further comprising a first orifice valve provided at a front end of the temperature maintaining means on the double pipe air intake line to control the amount of air introduced into the double pipe air intake line. According to claim 5,
Ship's fuel gas supply system further comprising a double pipe middle wall dividing the inner pipe and the outer surface of the gas double pipe into two spaces. According to claim 8,
The double pipe middle wall is a fuel gas supply system of a ship located close to the main engine in the gas double pipe. According to claim 8,
The outside air exchange unit,
an engine air intake line branched from the double tube air intake line and connected to the main engine by bypassing the gas double tube; and
Ship's fuel gas supply system further comprising an engine air discharge line for discharging air inside the main engine to the outside. According to claim 10,
The double pipe air discharge line is provided in communication with a space located relatively far from the main engine among the two spaces partitioned by the middle wall of the double pipe. According to claim 11,
The engine air discharge line has one end connected to the exterior of the gas double pipe so as to communicate with a space located close to the main engine among the two spaces partitioned by the middle wall of the double pipe, and the other end connected to the double pipe air discharge line. ship's fuel gas supply system. According to claim 11,
Ship's fuel gas supply system further comprising a second orifice valve installed on the downstream side of the branching point of the engine air supply line on the double pipe air intake line and on the engine air intake line, respectively. As a fuel gas supply method for a ship in which an engine room is provided at the stern of the hull to use fuel gas as fuel,
Supply fuel gas to the main engine through a fuel supply line provided in a single pipe form outside the engine room and a gas double pipe connecting the fuel supply line and the main engine provided inside the engine room,
A method for supplying fuel gas to a ship that is separated from the engine room and sucks air inside a GVU room in which a gas valve unit is disposed and supplies it to the gas double pipe.

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