KR102333073B1 - Fuel gas supply system and method for ship - Google Patents

Abstract

The present invention relates to a fuel gas supply system for a ship in which an engine room is provided in a stern part of a hull and uses fuel gas as fuel. The fuel gas supply system comprises: a fuel supply unit for supplying fuel gas to a main engine and a gas engine provided in the engine room; a high-pressure gas valve unit for controlling the fuel gas supplied from the fuel supply unit to the main engine; and a low-pressure gas valve unit for controlling fuel gas supplied to the gas engine separately from the high-pressure gas valve unit, wherein the high-pressure gas valve unit and the low-pressure gas valve unit are located together in one space isolated from the engine room. The present invention aims to provide the fuel gas supply system and the method for a ship that can minimize the installation space of a gas valve train and a gas valve unit in a ship using fuel gas as fuel and reduce the amount of yard work of the ship.

Description

Ship's fuel gas supply system and method

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

In recent years, the consumption of liquefied gas such as LNG (Liquefied Natural Gas) or LPG (Liquefied Petroleum Gas) is rapidly increasing around the world. In particular, Liquefied Natural Gas (hereinafter referred to as "LNG") is As an eco-friendly fuel that emits less pollutants, its use is increasing in various fields.

A ship is a means of transport that carries a large amount of minerals, crude oil, natural gas, or thousands of containers or more and sails the ocean. move through

Such a ship generates thrust by driving an engine, in which the engine uses gasoline or diesel to move the piston so that the crankshaft is rotated by the reciprocating motion of the piston, so that the shaft connected to the crankshaft is rotated to drive the propeller it was common

However, recently, an LNG fuel supply method in which an engine is driven by using LNG as a fuel is used in an LNG carrier that transports liquefied natural gas (LNG). It is also applied to other ships.

Liquefied Natural Gas (hereinafter referred to as "LNG") is a colorless and transparent liquid obtained by cooling natural gas containing methane as a main component to about -162°C and liquefying it. It has a volume of about /600. Therefore, when transporting natural gas by liquefying it as LNG, it can be transported very efficiently. For example, an LNG carrier capable of transporting (or transporting) LNG by sea is used.

As international organizations and each country's regulatory standards for ships are getting stricter, interest in eco-friendly and high-efficiency fuels for ships is also increasing. Diesel Electric) and LNG-based ME-GI (Man Electric Gas Injection) engines have been developed and applied to ships.

In particular, as an engine for propulsion of an LNG ship, a ME-GI (Man Electric Gas Injection) engine powered by supplying LNG as a fuel may be applied. As a stroke high-pressure gas injection engine, it is spotlighted as a next-generation eco-friendly engine that can reduce emissions of nitrogen oxides (NOx) and sulfur oxides (SOx).

As described above, a vessel that uses LNG as a fuel is an LFS (LNG Fueled Ship), and it is expected that the construction and operation of the LFS will become more active in line with the strengthening of international ship emission regulation standards and the prospect of continued LNG price stabilization.

Republic of Korea Patent Publication No. 10-1577804

The ship is provided with a fuel gas supply system for supplying fuel gas as fuel, and fuel gas such as cryogenic LNG must be pressurized and vaporized according to the pressure and temperature conditions required by the engine.

For example, as an engine for propulsion of a ship, a ME-GI engine driven by receiving LNG as a fuel may be applied, and as an engine for power generation, a DF engine may be applied. Since the load can be variably operated, it must be possible to safely control the supply of fuel gas according to the load of the engine.

To this end, a gas valve train (GVT) is installed on the fuel supply line connected to the propulsion engine, and a gas valve unit (GVU) is installed on the fuel supply line connected to the power generation engine.

The gas valve train (GVT) and gas valve unit (GVU) are devices that safely control and supply the pressure and flow rate of fuel gas required by the engine. In case of an emergency such as leakage of fuel gas from the fuel supply line or engine trip, it is possible to perform functions such as emergency shutoff of fuel gas to minimize damage to the engine and ship.

In general, the gas valve train is disposed in a space in which a device for supplying fuel gas is provided, and the gas valve unit is disposed in the engine room because the gas valve unit should be disposed close to the power generation engine due to the load variation characteristics of the power generation engine.

At this time, since the engine room is classified as a safe zone, it is formed in a sealed housing box structure and disposed in the engine room.

As described above, when the gas valve unit is formed in a housing box structure and installed inside the engine room, space utilization can be high because there is no need to configure a separate room, but maintenance of the gas valve unit is not easy and the engine There is a disadvantage in that a separate exhaust line for the gas valve unit must be formed inside the room.

The gas valve unit may provide a gas valve unit room (GVU Room) isolated from the engine room in an area separate from the space where the gas valve train is installed outside the engine room and may be installed therein, for example, gas The valve unit room may be provided in a position adjacent to a steering gear room provided at the stern of the hull.

In this case, the open type can be applied, which has the advantage of facilitating maintenance of the gas valve unit. It may be uneconomical because the amount of work in the yard of the ship increases.

On the other hand, a gas purging operation for discharging fuel gas remaining in the engine system when the fuel gas supply to the engine is stopped or the engine is shut down is performed on ships using fuel gas as fuel.

In general, gas purging is configured to inject an inert gas such as nitrogen (N2) into the fuel supply line into the fuel supply line. In the prior art, the inert gas injected into the fuel supply line is a gas valve. It is supplied to the engine through the unit and discharged to the outside of the hull (ie, the safe area) through the exhaust line.

According to the prior art as described above, the pipe through which the residual gas is purged through the inert gas is disposed in the engine room, and thus there is a risk that the residual gas may leak, so improvement is required.

An object of the present invention is to provide a fuel gas supply system and method for a ship that can minimize the installation space of a gas valve train and a gas valve unit in a ship using fuel gas as fuel and reduce the amount of yard work of the ship. .

Another object of the present invention is to provide a fuel gas supply system and method for a ship capable of improving stability by changing the gas purging sequence so that the pipe through which the residual gas is purged is minimized inside the engine room.

According to one aspect of the present invention, an engine room is provided in the stern of a hull as a fuel gas supply system for a ship for using fuel gas as fuel, and to supply fuel gas to a main engine and a gas engine provided in the engine room. fuel supply for; a high-pressure gas valve unit for controlling the fuel gas supplied from the fuel supply unit to the main engine; and a low-pressure gas valve unit for controlling fuel gas supplied to the gas engine separately from the high-pressure gas valve unit may be provided.

The high-pressure gas valve unit and the low-pressure gas valve unit may be located together in one space isolated from the engine room.

In addition, the space may be a cargo compressor room (Cargo Compressor Room) in which the fuel supply unit and a device for increasing the pressure and vaporizing fuel gas therein in the bow side direction of the upper part of the engine room.

In addition, a separate GVU room separated from the cargo compressor room and isolated from the engine room in the bow direction of the upper part of the engine room is provided, and the high-pressure gas valve unit and the low-pressure gas valve unit are disposed inside the GVU room can be

In addition, a pipe trunk in which a fuel supply line for supplying fuel gas to each of the main engine and the gas engine is disposed is provided between the cargo compressor room and the engine room, and the fuel supply line is the main a first fuel line connecting the engine and the high-pressure gas valve unit; and a second fuel line connecting the gas engine and the low pressure gas valve unit.

In addition, the first fuel line is provided as a double pipe from the main engine to the high-pressure gas valve unit, and the second fuel line is provided as a double pipe from the gas engine to the pipe trunk, and the low-pressure gas inside the pipe trunk Up to the valve unit may be provided as a single pipe.

The second fuel line may further include a pressure control valve installed adjacent to the gas engine to control the pressure of fuel gas supplied to the gas engine.

In addition, each of the cargo compressor room and the pipe trunk is provided with a ventilation fan for discharging the internal air to the outside air, the ventilation fan is configured to communicate with each other, the first fuel line and the second fuel It may be provided to exchange the air inside the double pipe of the line with the outside air.

In addition, the buffer tank (Buffer Tank) provided in the engine room and storing the inert gas; a purging line connected to each of the main engine and the gas engine from the buffer tank to supply an inert gas into the fuel supply line; and a non-return valve set installed on the purging line to prevent a reverse flow of fuel gas.

In addition, the non-return valve set, a pair of block valves installed on the purging line (Block valve); a check valve installed at the rear end of the pair of block valves; and a bleed valve installed on a vent line branched from the purging line at a position between the pair of block valves.

In addition, the non-return valve set may further include a plurality of actuators for opening and closing the pair of block valves and the bleed valve.

In addition, the pair of block valves, a first block valve; and a second block valve installed at a rear end of the first block valve, wherein any one of the plurality of actuators is provided to open and close the first block valve, and the other one of the plurality of actuators is the second block valve. It is provided to open and close the block valve and the bleed valve, and opening and closing operations of the second block valve and the bleed valve may be oppositely linked.

In addition, the purging line may include a first purging line connecting the main engine from the buffer tank; and a second purging line connecting the buffer tank and the gas engine, wherein the non-return valve set may be installed in each of the first purging line and the second purging line.

In addition, the non-return valve set may be located in a gas hazardous area.

In addition, the exhaust gas pipeline for discharging the exhaust gas (exhaust gas) of the gas engine; a sub line branching from the exhaust gas pipeline; and a rupture disc provided on the sub-line and configured to rupture at a preset pressure, wherein the non-return valve set may be located in a region where exhaust gas is discharged from the rupture disc.

In addition, the tubing line is connected to the check valve set for supplying compressed air for operating the plurality of actuators (Tubing Line); and a plurality of solenoid valves installed on the tubing line to control the supply of compressed air.

In addition, the plurality of solenoid valves may be provided in a non-explosion-proof structure by being located in an engine casing above the engine room.

According to another aspect of the present invention, as a fuel gas supply method for a ship using fuel gas as a fuel provided with an engine room in the stern part of the hull, the main engine and the gas engine arranged in the engine room from the fuel supply part are connected to each other and supplying fuel gas to each of the main engine and the gas engine through a gas valve unit installed on a fuel supply line, wherein the gas valve unit is a high-pressure gas valve for controlling the fuel gas supplied to the main engine. a unit and a low-pressure gas valve unit for controlling the fuel gas supplied to the gas engine, wherein the high-pressure gas valve unit and the low-pressure gas valve unit are located together in one space isolated from the engine room. A fuel gas supply method may be provided.

Further comprising the step of purging the fuel gas remaining in the fuel supply line by injecting an inert gas into the fuel supply line when the main engine or the gas engine is shut down, and injecting the inert gas into the fuel supply line. A non-return valve set for preventing a reverse flow of fuel gas is installed on the purging line for supplying, and the inert gas is supplied to the main engine or the gas engine through the non-return valve set, and then the fuel supply line and the It may be discharged to a safety area outside the hull by sequentially passing through the gas valve unit.

The present invention can minimize the installation space of the gas valve unit by disposing the high-pressure gas valve unit and the low-pressure gas valve unit together in one space, thereby reducing the amount of yard work of the vessel.

In addition, the inert gas used during gas purging is supplied to the main engine or gas engine through the non-return valve set, and then passes through the fuel supply line and the gas valve unit in sequence so that it can be discharged to a safe area outside the hull. (Gas purging) By changing the order, the pipe through which the residual gas is discharged is minimized inside the engine room, and thus stability can be improved.

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.
FIG. 2 is a view for explaining the configuration of the non-return valve set shown in FIG. 1 .

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. First of all, it should be noted that in adding reference numerals to the components of each drawing, the same components are given the same reference numerals as much as possible even if they are indicated 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 thereof will be omitted. In addition, preferred embodiments of the present invention will be described below, but the technical spirit of the present invention is not limited thereto and may be variously implemented by those skilled in the art without being limited thereto.

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, and FIG. 2 is a diagram for explaining the configuration of the non-return valve set shown in FIG. 1 .

In describing the fuel gas supply system 100 of a ship according to an embodiment of the present invention with reference to FIG. 1, the side (left) where the propulsion device (unsigned) is provided is the stern direction of the ship, and the opposite side (Right) indicates the bow direction.

In addition, the fuel gas may be a liquefied gas obtained by vaporizing LNG stored in an LNG storage tank (not shown), or may be used to include all of boil-off gas (BOG).

The ship to which the fuel gas supply system 100 of this embodiment is applied is a LFS (Liquefied Natural Gas Fueled Ship) using LNG as a fuel, and may be, for example, a container ship.

1, the engine room (Engine Room) (ER) is provided in the stern part of the hull, and the main engine (ME) is connected to the propulsion device inside the engine room (ER) and transmits power to the propulsion device to generate propulsion. ) and a gas engine (GE) that transmits power to other equipment such as a power plant using LNG or boil-off gas (BOG).

As the main engine (ME) of the ship, a ME-GI (Man Electric Gas Injection) engine that is driven by supplying high-pressure LNG of 10 bar or more as fuel can be applied, and as a gas engine (GE), LNG of less than 10 bar is used. A general DF generator engine (Dual Fuel Generator) engine or X-DF (eXtreme Dual Fuel) engine may be applied as fuel.

However, the present invention is not limited to the type of engine disposed inside the engine room (ER), and all engines using natural gas such as LNG as a fuel may be applicable.

The fuel gas supply system 100 of a ship according to an embodiment of the present invention is a fuel supply unit 110 for supplying fuel gas to the main engine ME and the gas engine GE provided in the engine room ER. ), the high-pressure gas valve unit 120 for controlling the fuel gas supplied from the fuel supply unit 110 to the main engine ME, and the fuel supplied to the gas engine GE separately from the high-pressure gas valve unit 120 . It may include a low pressure gas valve unit 130 for controlling the gas.

The fuel supply unit 110 may be provided outside the engine room ER rather than inside the engine room ER, and is preferably provided in the bow side direction above the engine room ER to pressurize the fuel gas therein and It may be disposed in a Cargo Compressor Room (CCR) in which a device (not shown) for vaporizing is disposed.

The fuel gas compressed and vaporized in the fuel supply unit 110 may be supplied to the main engine ME and the gas engine GE along a fuel supply line, and the fuel supply line is a cargo compressor room (CCR) and an engine room (ER). ) may be provided to pass through the inside of the pipe trunk (Pipe Trunk) (PT) provided between.

Here, since the fuel gas amount and pressure required by the main engine ME and the gas engine GE are different, the fuel supply line is a first fuel connecting the main engine ME and the high-pressure gas valve unit 120 to be described later. The line FL1 may be separated into a second fuel line FL2 connecting the gas engine GE and the low pressure gas valve unit 130 to be described later.

The first fuel line FL1 is provided as a double pipe from the main engine ME to the high-pressure gas valve unit 120 for safety of the fuel gas supply system and may be configured to pass through the pipe trunk PT.

The second fuel line FL2 may be provided as a double pipe from the gas engine GE to the pipe trunk PT, similar to the first fuel line FL1, and a low-pressure gas valve unit in the pipe trunk PT. 130 may be provided as a single tube.

Since the second fuel line FL2 does not require a separate hydraulic test, the second fuel line FL2 is configured as a single pipe inside the pipe trunk PT, and the pipe trunk PT is the second fuel. It may serve as an external pipe of the line FL2.

At this time, the pipe trunk (PT) is provided with a ventilation fan (F1) for discharging the internal air to the outside air, the first fuel line (FL1) and the second fuel line (FL1) through the ventilation fan (F1) It can be configured to change the air inside the double tube of FL2) 30 times per hour (Air change).

The cargo compressor room (CCR) may also be provided with a ventilation fan (F2) that exchanges the air inside the cargo compressor room (CCR) 30 times per hour.

In this embodiment, the ventilation fan F2 provided in the cargo compressor room CCR may be configured to communicate with the ventilation fan F1 provided in the pipe trunk PT.

In the fuel gas supply system 100 according to an embodiment of the present invention, the ventilation fan F2 provided in the cargo compressor room CCR is a backup ( back up) or can be integrated with the ventilation fan F1 provided in the pipe trunk (PT), inside the double pipe of the pipe trunk (PT) and the first fuel line (FL1) and the second fuel line (FL2) It can serve to exchange air.

The high-pressure gas valve unit 120 may be installed on the first fuel line FL1 to control the pressure and flow rate of fuel gas supplied from the fuel supply unit 110 to the main engine ME.

The low pressure gas valve unit 120, similar to the high pressure gas valve unit 120, is installed on the second fuel line FL2 and is configured to control the fuel gas supplied to the gas engine GE.

In this embodiment, the high-pressure gas valve unit 120 and the low-pressure gas valve unit 130 may be located together in one space isolated from the engine room ER, as shown in FIG. 1 .

Since the engine room is classified as a safe zone, in the prior art, the gas valve unit forms a sealed housing box structure and is provided inside the engine room or outside the engine room in a separate space provided in a zone isolated from the engine room. provided

However, when installed inside the engine room, maintenance is not easy due to the housing box structure. The downside is that there are a lot of them.

The fuel gas supply system 100 for a ship according to an embodiment of the present invention minimizes the installation space of the gas valve unit by disposing the high-pressure gas valve unit 120 and the low-pressure gas valve unit 130 together in one space. This can have the effect of reducing the amount of yard work of the ship.

On the other hand, the low-pressure gas valve unit 120 for controlling the fuel gas supplied to the gas engine GE should be located close to the gas engine GE, and the distance between the gas engine GE and the low-pressure gas valve unit 130 . It may be undesirable to move away.

In other words, when the distance between the gas engine GE and the low-pressure gas valve unit 130 increases, the response speed according to the load change of the gas engine GE may be delayed, and stable fuel to the gas engine GE Gas supply can be difficult.

In order to compensate for the delay in response speed of the low pressure gas valve unit 130 according to the load change of the gas engine GE, the fuel gas supply system 100 of the ship according to an embodiment of the present invention is a second fuel. The line FL2 may further include a pressure control valve 140 installed at a position adjacent to the gas engine GE to control the pressure of the fuel gas.

In this case, the pressure control valve 140 may be provided by separating only the gas control valve provided in the existing gas valve unit and installing it in a position adjacent to the gas engine GE.

In this embodiment, the high-pressure gas valve unit 120 and the low-pressure gas valve unit 130 may be disposed inside the cargo compressor room (CCR).

The cargo compressor room (CCR) is a gas hazardous area, and when the high-pressure gas valve unit 120 and the low-pressure gas valve unit 130 are disposed inside the cargo compressor room (CCR), a separate There is an advantage that a ventilation function can be performed in preparation for fuel gas leakage through the ventilation fan F2 provided in the cargo compressor room (CCR) without adding an exhaust device.

1, although it is shown that the high-pressure gas valve unit 120 and the low-pressure gas valve unit 130 are disposed inside the cargo compressor room (CCR), the present invention is not limited thereto, and the engine room (ER) ) Separate from the cargo compressor room (CCR) and the engine room (ER) in the upper bow direction, a separate GVU room is provided, and a high-pressure gas valve unit 120 and a low-pressure gas valve unit 130 are provided inside the GVU room. ) may be configured to be disposed.

The fuel gas supply system 100 of a ship according to an embodiment of the present invention, by disposing the high-pressure gas valve unit 120 and the low-pressure gas valve unit 130 together in the cargo compressor room (CCR), the high-pressure gas valve It does not require a separate exhaust device for the unit 120 and the low-pressure gas valve unit 130 and can have the effect of minimizing the installation space.

In addition, when the high-pressure gas valve unit 120 and the low-pressure gas valve unit 130 are disposed inside the GVU room which is formed separately from the cargo compressor room (CCR), the high-pressure gas valve unit 120 and the low-pressure gas valve unit ( 130) and the cargo compressor room (CCR), it is possible to reduce the application of the double pipe of the fuel supply line. When the room is formed, there is an advantage in that it is possible to reduce the phenomenon of the fuel gas pressure hunting (Gas pressure hunting) when the fuel gas is supplied.

On the other hand, in ships using fuel gas as fuel, when the fuel gas supply to the engine is stopped or the engine is shut down, an inert gas such as nitrogen (N2) is used to discharge the fuel gas remaining in the engine system. Gas purging should be performed.

The fuel gas supply system 100 for a ship according to an embodiment of the present invention includes a buffer tank (BT) in which an inert gas is stored, and a main engine (ME) and gas from the buffer tank (BT). It may further include a purging line connected to each of the engines GE for supplying an inert gas into the fuel supply line.

The buffer tank BT may be provided inside the engine room ER, and may receive an inert gas from a separate inert gas generator (not shown) and store it therein.

In this embodiment, the inert gas generator may be an N2 generator, and nitrogen may be stored as an inert gas for gas purging in the buffer tank BT.

The position of the inert gas generator is not limited on the hull, and as an example, may be provided in an engine casing (Engine Casing) EC provided above the engine room (ER).

The fuel gas supply system 100 for a ship according to an embodiment of the present invention supplies fuel gas through the fuel supply unit 110, and is inert in a section in which the fuel gas moves, such as a fuel supply line and a gas valve unit. A gas purging operation may be performed by supplying gas.

The purging line may include a first purging line PL1 connecting the main engine ME from the buffer tank BT, and a second purging line PL2 connecting the buffer tank BT and the gas engine GE. can

In this embodiment, the purging line may further include a non-return valve set 150 installed to prevent a reverse flow of fuel gas.

In this embodiment, the non-return valve set 150 may be a double block and bleed valve (DBB).

2 is a view for explaining the configuration of the non-return valve set 150 according to an embodiment of the present invention.

The non-return valve set 150 is, as shown in FIG. 2 , a pair of block valves 151 and 152 installed on the purging line, and a pair of block valves 151 at the rear end. A bleed valve installed on a vent line (VL) branched from the purging line at a position between the installed check valve 153 and the pair of block valves 151 and 152 ) (154).

The pair of block valves 151 and 152 may be installed at the forefront of the plurality of valves provided in the non-return valve set 150 on the purging line.

The pair of block valves 151 and 152 are normally closed, and may be configured to open only when an inert gas is supplied.

The check valve 153 is a valve that allows the fluid to flow in only one direction, and is installed at the rear end of the pair of block valves 151 and 152 on the purging line to prevent the reverse flow of fuel gas. can

The check valve 154 may be always open, but the check valve 154 of this embodiment may be preferably provided as a closeable check valve capable of opening and closing the valve for maintenance and the like.

Meanwhile, a vent line VL branching at a position between a pair of block valves 151 and 152 is provided on the purging line, and a bleed valve 154 may be installed on the vent line VL of this embodiment.

The bleed valve 154 may be provided such that the opening and closing operations of the pair of block valves 151 and 152 are reversed.

That is, when the pair of block valves 151 and 152 are normally closed, the bleed valve 154 is open, and when the pair of block valves 151 and 152 is opened when the inert gas is supplied, the bleed valve 154 ) can be configured to be closed.

In the fuel gas supply system 100 of a ship according to an embodiment of the present invention, since a pair of block valves 151 and 152 are normally closed and the bleed valve 154 is open, a vent when the fuel gas flows back It may be possible to discharge the fuel gas to a safe area through the line VL.

In the prior art, the reverse flow of fuel gas was prevented with one general check valve, but in the fuel gas supply system 100 of a ship according to an embodiment of the present invention, a pair of block valves at the front end of the check valve 153 By providing 151 and 152 and installing a bleed valve 154 on the vent line VL, not only to prevent the backflow of fuel gas through the check valve 153, but also to the safety area through the vent line VL. Fuel gas emissions may be possible.

The non-return valve set 150 of this embodiment can have the effect that it can be arranged even in a narrow space by integrating the plurality of valves as described above.

In this embodiment, the non-return valve set 150 may be preferably located in a gas hazardous area (Hazadous Area).

Referring to FIG. 1 , the fuel gas supply system 100 for a ship according to an embodiment of the present invention is an exhaust gas pipeline for discharging exhaust gas generated from a gas engine GE. Pipeline) (EL), a sub-line (SL) branching from the exhaust gas pipeline (EL), and a rupture disc installed on the sub-line (SL) and configured to rupture at a preset pressure (160) may be further included.

The rupture disk 160 is destroyed just before the pressure overload or internal explosion of the exhaust gas pipeline EL, and the area where exhaust gas is discharged from the rupture disk 160 is a gas hazardous area, so the non-return valve set 150 of this embodiment ) may be located in a region where exhaust gas is discharged from the rupture disk 160 .

Referring back to FIG. 2 , the non-return valve set 150 may further include a plurality of actuators A for opening and closing a pair of block valves 151 and 152 and a bleed valve 154. .

The plurality of actuators (A) may be provided as three as the number of the pair of block valves 151 and 152 and the bleed valve 154 provided in the non-return valve set 150, and the pair of block valves 151 , 152) by connecting any one and the bleed valve 154 through a mechanical link (link) may be provided with two actuators (A).

As an example, the pair of block valves may include a first block valve 151 installed at the front end of the purging line, and a second block valve 152 installed at the rear end of the first block valve 152 . There, any one of the plurality of actuators (A) is provided to open and close the first block valve 151, and the other of the plurality of actuators (A) connects the second block valve 152 and the bleed valve 154. It may be provided to open and close.

At this time, the actuator A, which is provided to open and close the second block valve 152 and the bleed valve 154, is interlocked so that the opening and closing operations of the second block valve 152 and the bleed valve 154 are opposite to each other. can

In this embodiment, the non-return valve set 150 may further include one or more pressure sensors (not shown), and are located in the gas hazardous area to perform maintenance of each of the plurality of actuators (A). It may be provided to facilitate this.

In the prior art, the inert gas injected into the fuel supply line is supplied to the engine through the gas valve unit, and is discharged to the outside (ie, the safe area) through the exhaust line. It is placed in the room and there is a risk that residual gas may leak therefrom.

In the fuel gas supply system 100 for a ship according to an embodiment of the present invention, an inert gas is supplied to the engine from the buffer tank BT through the non-return valve set 150 during gas purging and then passes through the gas valve unit. It is discharged to the outside of the hull (Safe area), and the stability of the gas purging operation can be improved.

In addition, since most of the piping through which residual gas is purged and discharged is disposed in the pipe trunk (PT) and cargo compressor room (CCR) (or GVU room), the risk of explosion due to leakage of residual gas is minimized and the stability of the ship This can be improved.

The non-return valve set 150 may constitute one valve set per engine, and may be divided into an engine for power generation and an engine for propulsion, and only two may be installed.

The fuel gas supply system 100 of a ship according to an embodiment of the present invention is connected to a non-return valve set 150 and a tubing line for supplying compressed air for operating a plurality of actuators A (Tubing Line) (TL), and may further include a plurality of solenoid valves (Solenoid Valve) (SV) installed on the tubing line (TL) to control the supply of compressed air.

A plurality of tubing lines TL may be connected in parallel to enable the supply of individual compressed air to each of the pair of block valves 151 and 152 and the bleed valve 154, the solenoid valve SV and each tubing line (TL) can be installed in parallel.

In the case of a plurality of solenoid valves (SV), it may be undesirable because expensive explosion-proof equipment must be applied when located in a gas hazardous area.

In this embodiment, the plurality of solenoid valves SV may be provided on a safe zone by forming a group, for example, in the engine casing EC above the engine room ER. It may be positioned so that the application of a non-explosion-proof structure is possible.

The fuel gas supply system 100 for a ship according to an embodiment of the present invention may further include a control unit 170 .

When an emergency such as a trip of the engine or leakage of fuel gas from the fuel supply line occurs, the control unit 170 transmits a signal to the non-return valve set 150 to control the gas purging operation. can

That is, the control unit 170 controls to open a pair of block valves 151 and 152 and close the bleed valve 154 during gas purging to control the supply of inert gas and prevention of backflow of fuel gas. can

In addition, the control unit 170 may control the ventilation fans F1 and F2 to operate back up or integrated with each other, and may control only one ventilation fan to operate.

Hereinafter, a method for supplying fuel gas to a ship according to an embodiment of the present invention will be briefly described.

In the fuel gas supply method of a ship according to an embodiment of the present invention, an engine room (ER) is provided in the stern part of a hull, and a main engine (ME) disposed inside the engine room (ER) from the fuel supply unit 110 and It may include supplying fuel gas to each of the main engine ME and the gas engine GE through a gas valve unit installed on a fuel supply line connecting each of the gas engines GE.

At this time, the gas valve unit controls the high-pressure gas valve unit 120 for controlling the fuel gas supplied to the main engine ME, and the fuel gas supplied to the gas engine GE separately from the high-pressure gas valve unit 120 . and a low-pressure gas valve unit 130 , and the high-pressure gas valve unit 120 and the low-pressure gas valve unit 130 may be located together in one space isolated from the engine room (ER).

Meanwhile, the method may further include purging the fuel gas remaining in the fuel supply line by injecting an inert gas into the fuel supply line when the main engine ME or the gas engine GE is shut down.

Here, a non-return valve set 150 is installed on the purging line for supplying the inert gas into the fuel supply line to prevent a reverse flow of the fuel gas, and the inert gas passes through the non-return valve set 150 to the main engine After being supplied to (ME) or gas engine (GE), it can be discharged to a safe area outside the hull by sequentially passing through the fuel supply line and the gas valve unit.

The present invention can minimize the installation space of the gas valve unit by disposing the high-pressure gas valve unit and the low-pressure gas valve unit together in one space, thereby reducing the amount of yard work of the vessel.

In addition, the inert gas used during gas purging is supplied to the main engine or gas engine through the non-return valve set, and then passes through the fuel supply line and the gas valve unit in sequence so that it can be discharged to a safe area outside the hull. (Gas purging) By changing the order, the pipe through which the residual gas is discharged is minimized inside the engine room, and thus stability can be improved.

The above description is merely illustrative of the technical idea of the present invention, and various modifications, changes, and substitutions are possible within the range that does not depart from the essential characteristics of the present invention by those of ordinary skill in the art to which the present invention pertains. will be. Accordingly, the embodiments disclosed in the present invention and the accompanying drawings are for explaining, not limiting, the technical spirit of the present invention, and the scope of the technical spirit of the present invention is not limited by these embodiments and the accompanying drawings. . The protection scope of the present invention should be construed by the following claims, 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 (Fuel gas supply system)
110: fuel supply unit
120: high pressure gas valve unit
130: low pressure gas valve unit
140: pressure control valve (Pressure Control vavle)
150: non-return valve set
160: Rupture Disc (Rupture Disc)
ER: Engine Room
ME: Main Engine
GE: Gas Engine
BT: Buffer Tank
CCR: Cargo Compressor Room
PT: Pipe Trunk
EC: Engine Casing

Claims (18)

As a fuel gas supply system of a ship for using fuel gas as fuel by providing an engine room in the stern part of the hull,
a fuel supply unit for supplying fuel gas to the main engine and the gas engine provided in the engine room;
A cargo compressor room (Cargo Compressor Room) that is provided in the direction of the bow side of the upper part of the engine room and the device for boosting and vaporizing fuel gas therein and the fuel supply unit is disposed;
a pipe trunk in which a fuel supply line for supplying fuel gas to each of the main engine and the gas engine is disposed between the cargo compressor room and the engine room;
a high-pressure gas valve unit for controlling the fuel gas supplied from the fuel supply unit to the main engine; and
and a low pressure gas valve unit for controlling the fuel gas supplied to the gas engine separately from the high pressure gas valve unit,
The fuel supply line is
a first fuel line connecting the main engine and the high-pressure gas valve unit; and
and a second fuel line connecting the gas engine and the low pressure gas valve unit,
Further comprising a pressure regulating valve installed in a position adjacent to the gas engine on the second fuel line to control the pressure of fuel gas supplied to the gas engine,
The high-pressure gas valve unit and the low-pressure gas valve unit are separated from the cargo compressor room in the bow side direction above the cargo compressor room or the engine room and are disposed inside a separate GVU room isolated from the engine room. of fuel gas supply system. delete delete delete The method of claim 1,
The first fuel line is provided as a double pipe from the main engine to the high-pressure gas valve unit,
The second fuel line is provided as a double pipe from the gas engine to the pipe trunk, and is provided as a single pipe from the inside of the pipe trunk to the low pressure gas valve unit. delete 6. The method of claim 5,
Each of the cargo compressor room and the pipe trunk is provided with a ventilation fan for discharging internal air to the outside,
The ventilation fan is configured to communicate with each other, and the fuel gas supply system of a ship is provided to exchange air inside the double pipe of the first fuel line and the second fuel line with outside air. The method of claim 1,
a buffer tank provided in the engine room and storing an inert gas;
a purging line connected to each of the main engine and the gas engine from the buffer tank to supply an inert gas into the fuel supply line; and
The fuel gas supply system of a ship further comprising a non-return valve set installed on the purging line to prevent a reverse flow of fuel gas. 9. The method of claim 8,
The non-return valve set is
a pair of block valves installed on the purging line;
a check valve installed at the rear end of the pair of block valves; and
and a bleed valve installed on a vent line branched from the purging line at a position between the pair of block valves. 10. The method of claim 9,
The non-return valve set is
A fuel gas supply system for a ship further comprising a plurality of actuators for opening and closing the pair of block valves and the bleed valve. 11. The method of claim 10,
The pair of block valves,
a first block valve; and
and a second block valve installed at the rear end of the first block valve,
Any one of the plurality of actuators is provided to open and close the first block valve,
The other one of the plurality of actuators is provided to open and close the second block valve and the bleed valve, and the opening and closing operations of the second block valve and the bleed valve are opposite to each other. 9. The method of claim 8,
The purging line is
a first purging line connecting the main engine from the buffer tank; and
and a second purging line connecting the buffer tank and the gas engine,
The non-return valve set is a fuel gas supply system of a ship installed in each of the first purging line and the second purging line. 9. The method of claim 8,
The non-return valve set is a fuel gas supply system for a ship located in a gas hazardous area. 9. The method of claim 8,
an exhaust gas pipeline for discharging exhaust gas of the gas engine;
a sub line branching from the exhaust gas pipeline; and
It further comprises a rupture disc (Rupture Disc) provided on the sub-line and configured to rupture at a predetermined pressure,
The non-return valve set is a fuel gas supply system for a ship located in a region where exhaust gas is discharged from the rupture disk. 11. The method of claim 10,
a tubing line connected to the non-return valve set to supply compressed air for operating the plurality of actuators; and
A fuel gas supply system for a ship further comprising a plurality of solenoid valves installed on the tubing line to control the supply of compressed air. 16. The method of claim 15,
The plurality of solenoid valves are located in an engine casing above the engine room and are provided in a non-explosion-proof structure for a fuel gas supply system for a ship. A method of supplying fuel gas for a ship in which an engine room is provided in the stern part of a hull and uses fuel gas as fuel,
and supplying fuel gas from the fuel supply unit to each of the main engine and the gas engine through a gas valve unit installed on a fuel supply line connecting each of the main engine and the gas engine disposed in the engine room,
The gas valve unit includes a high-pressure gas valve unit for controlling the fuel gas supplied to the main engine, and a low-pressure gas valve unit for controlling the fuel gas supplied to the gas engine,
The fuel supply line is
a first fuel line connecting the main engine and the high-pressure gas valve unit; and
and a second fuel line connecting the gas engine and the low pressure gas valve unit,
Installing a pressure control valve on the second fuel line adjacent to the gas engine to adjust the pressure of fuel gas supplied to the gas engine,
The high-pressure gas valve unit and the low-pressure gas valve unit are provided in the bow side direction of the upper part of the engine room, and a cargo compressor room or an upper part of the engine room in which a device for boosting and vaporizing fuel gas and the fuel supply unit are disposed. A method of supplying fuel gas of a ship that is disposed in a separate GVU room that is separated from the cargo compressor room in the bow direction and is isolated from the engine room. 18. The method of claim 17,
Further comprising the step of purging the fuel gas remaining in the fuel supply line by injecting an inert gas into the fuel supply line when the main engine or the gas engine is shut down,
A non-return valve set for preventing the reverse flow of fuel gas is installed on the purging line for supplying the inert gas into the fuel supply line,
After the inert gas is supplied to the main engine or the gas engine through the non-return valve set, it sequentially passes through the fuel supply line and the gas valve unit to supply the fuel gas of the ship discharged to the safety area outside the hull. Way.

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