KR102670761B1 - Arrangement of lfs system on container ship - Google Patents

Abstract

The present invention relates to an LFS system layout structure for a container ship. The LFS system layout structure according to an embodiment of the present invention includes an LNG fuel tank for storing LNG used as fuel for a ship; A second deck disposed on top of the LNG fuel tank; A fuel gas supply room disposed on the second deck and equipped with one or more devices for supplying LNG stored in the LNG fuel tank or boil-off gas generated from the LNG fuel tank to the propulsion device of the ship; A tank connection disposed on the upper part of the LNG fuel tank, on which a part of the dome of the LNG fuel tank is disposed, and on which a fuel pipe is arranged to supply LNG through the dome to the propulsion device of the ship through the fuel gas supply room. ; And it may include a duct trunk disposed on the second deck and installed to collect the leaked gas or air generated in one or more of the fuel gas supply room and the tank connection to discharge the leaked gas or air to the outside. According to the present invention, the fuel gas supply room, tank connection, and bunkering station, which are classified as hazardous areas, are all placed on the second deck, which has the effect of efficiently managing the hazardous area.

Description

Arrangement structure of LFS system of container ship {ARRANGEMENT OF LFS SYSTEM ON CONTAINER SHIP}

The present invention relates to the layout structure of the LFS system of a container ship, and more specifically, to the layout structure of the LFS system of a container ship propelled by LNG as fuel.

In general, ships are propelled by engines that generate power by combustion of fuel. When used as fuel for ships, heavy oil, MOD (marine diesel oil), MFO (marine fuel oil), etc. cause environmental pollution due to a large amount of harmful substances generated during the combustion process. Therefore, an eco-friendly ship (LNG fueled ship, LFS) that uses liquefied natural gas (LNG) as fuel was developed and received official certification from each country's classification society to meet the demand for conversion to clean energy due to environmental regulations. It is satisfying.

Not only can this LFS be applied to various types of ships such as container ships and tankers, but the gas propulsion engine used reduces the generation of carbon dioxide, nitrogen oxides, and sulfur oxides compared to diesel engines of the same output, and reduces the existing Compared to ship fuel, the price per unit of heat is considerably cheaper, so it also satisfies economic feasibility.

At this time, LNG is a colorless and transparent liquid made by cooling natural gas mainly containing methane to 162℃ and liquefying it. It contains almost no pollutants and has a high calorific value, making it an excellent fuel. In addition, LNG has the advantage of high storage efficiency because it is reduced to 1/600 of its volume by liquefaction.

Recently, an LNG fuel supply method that uses LNG as fuel to drive the engine in LNG carriers has been developed, and attempts are being made to apply this method of using LNG as engine fuel to ships other than LNG carriers. is increasing.

In addition to the above trends, efforts are being made to improve navigation efficiency by using LNG as a propulsion fuel for container ships.

The present invention can effectively utilize space within the ship by efficiently arranging various equipment for supplying LNG fuel from the LNG fuel tank installed on the lower side of the cabin to the ship's propulsion device for container ships that use LNG as fuel. We propose a layout structure for container ships.

This is a patent for a ship with an LNG fuel tank placed on the lower side of the cabin, including Domestic Patent No. 10-12109016 (Floating Structure with Fuel Tank for Gas Fuel) and Domestic Patent No. 10-1606701 (Container Ship and its However, the above patents only describe matters related to the arrangement of the LNG fuel tank for the engine, and also describe specific details regarding the arrangement of related facilities related to the fuel gas supply system. It didn't happen.

In addition, among the current patents that allow an LNG fuel tank to be placed and operated on the lower side of the cabin, there are no patents that can actually be applied.

The present invention, in addition to the existing technology of placing an LNG fuel tank on the lower side of the cabin, adds technology related to the overall arrangement related to the fuel gas supply system (FGSS) to create a container that can be immediately applied to a live ship. The purpose is to provide a layout structure for a ship, and in particular, a specific layout structure for a bunkering station provided for loading or unloading of LNG.

The LFS system arrangement structure according to an embodiment of the present invention includes an LNG fuel tank that stores LNG used as fuel for ships; A second deck disposed on top of the LNG fuel tank; A fuel gas supply room disposed on the second deck and equipped with one or more devices for supplying LNG stored in the LNG fuel tank or boil-off gas generated from the LNG fuel tank to the propulsion device of the ship; A tank connection disposed on the upper part of the LNG fuel tank, on which a part of the dome of the LNG fuel tank is disposed, and on which a fuel pipe is disposed to supply LNG through the dome to the propulsion device of the ship through the fuel gas supply room. ; And it may include a duct trunk disposed on the second deck and installed to collect the leaked gas or air generated in one or more of the fuel gas supply room and the tank connection to discharge the leaked gas or air to the outside.

It is disposed on an upper part of the second deck, and further includes an upper deck with a cabin installed thereon, and the duct trunk may be connected to a duct trunk disposed in the cabin.

A ventilator is installed in the cabin to supply or exhaust air, and the ventilator can supply air to a duct trunk installed on the second deck.

The duct trunk may be disposed between the fuel gas supply room and the tank connection part.

It is disposed on the second deck and further includes a dry powder room in which at least one of dry powder and nitrogen for fire suppression is stored, and the tank connection part may be disposed between the fuel gas supply room and the dry powder room. there is.

Two bunkering stations disposed on the second deck and adjacent to the left and right walls of the ship's hull, respectively; and a pipe trunk disposed between the tank connection portion and one of the two bunkering stations, where the fuel pipe and the LNG loading pipe are disposed.

A side passage extending in the longitudinal direction of the hull is formed on one or more of the port and starboard sides of the ship's hull, and the bunkering system may be disposed on the path of the one or more side passages.

The fuel gas supply room and the tank connection have an entrance formed through the side passage, and the entrance may have an air-lock structure.

On the other hand, the LFS system arrangement structure according to an embodiment of the present invention includes an upper deck with a cabin installed at the top; a second deck installed below the upper deck; An LNG fuel tank disposed at the lower part of the second deck and storing LNG used as fuel for ships; A fuel gas supply room disposed on the second deck and equipped with one or more devices for supplying LNG stored in the LNG fuel tank or boil-off gas generated from the LNG fuel tank to the propulsion device of the ship; A tank connection portion disposed on the second deck and having a fuel pipe disposed to supply LNG from the LNG fuel tank to the propulsion device of the ship through the fuel gas supply room; And it may include a first duct trunk disposed on the second deck and collecting leaked gas or air generated in the fuel gas supply room and the tank connection to discharge the leaked gas or air to the outside.

a second duct trunk installed in the cabin and extending from a fan room equipped with a fan; and a ventilator installed at least one of the front and rear of the cabin, supplying or exhausting air, wherein the first duct trunk is connected to the second duct trunk, and the ventilator is Air may be supplied to the first duct trunk.

According to the present invention, the fuel gas supply room, tank connection, and bunkering station, which are classified as hazardous areas, are all placed on the second deck, which has the effect of efficiently managing the hazardous area.

In addition, leaked gas or air generated in the hazardous area can be collected through the duct trunk and discharged to the outside, so ventilation to discharge the leaked gas or air can be applied at a low cost and increase stability in the hazardous area. You can.

Figure 1 is a schematic diagram showing the front cross-section of a container ship to which an arrangement structure according to an embodiment of the present invention is applied.
Figure 2 is a schematic diagram showing a side cross-section of a portion where an LNG fuel tank and a fuel gas supply room are located in a container ship to which an arrangement structure according to an embodiment of the present invention is applied.
FIG. 3 is a diagram illustrating area A of FIG. 1.
FIG. 4 is a diagram showing area B of FIG. 1.
Figure 5 is a plan view showing the upper deck located above the LNG fuel tank in a container ship to which the arrangement structure according to an embodiment of the present invention is applied.
Figure 6 is a plan view showing the second deck located on the upper side of the LNG fuel tank in a container ship to which the arrangement structure according to an embodiment of the present invention is applied.

Preferred embodiments of the present invention will be described in more detail with reference to the attached drawings.

The present invention relates to a container ship that generates propulsion by receiving LNG as fuel. As a ship's propulsion device, for example, low-pressure gas injection engines such as DFDE (dual fuel diesel electric), high-pressure gas injection engines such as ME-GI, and gas turbines can be used, and different types of fuel can be used as fuel. Other propulsion devices can also be used if they are available.

Hereinafter, the present invention will be described in detail by explaining preferred embodiments of the present invention with reference to the accompanying drawings. The same reference numerals in each drawing indicate the same member.

Figure 1 is a schematic diagram showing the front cross-section of a container ship to which an arrangement structure according to an embodiment of the present invention is applied, and Figure 2 is a container ship to which an arrangement structure according to an embodiment of the present invention is applied, LNG fuel tank and fuel This is a schematic diagram showing a side cross-section of the portion where the gas supply room 210 is located. And FIG. 3 is a diagram showing area A of FIG. 1, and FIG. 4 is a diagram showing area B of FIG. 1.

Referring to Figures 1 and 2, the container ship according to an embodiment of the present invention includes a cabin (accommodation, 10) where the crew lives, an LNG fuel tank 100 disposed on the lower side of the cabin 10, and LNG fuel. It is disposed on the upper side of the tank 100 and includes a fuel gas supply room 210 that supplies LNG fuel from the LNG fuel tank 100 to the propulsion device.

The container ship according to the present invention has a number of containers inside the hull and on the upper deck, excluding the lower area of the cabin 10 and the engine room equipped with the propulsion device (located on the stern side of the ship). can be loaded.

The cabin 10 installed on the upper deck is a space where the crew lives, and as shown in FIG. 2, it can be divided into a plurality of floors in the vertical direction, such as A deck, B deck, and C deck, A cockpit to control navigation can be placed on the top floor.

As the size of container ships increases, the cabin 10 can be moved from the stern to the center of the hull to ensure better visibility. Here, the central portion of the hull refers to the front of the stern of the hull where the engine room is located, and does not refer to the central portion in the longitudinal direction of the hull.

As the cabin 10 is relocated to the center of the ship, it is not easy to load containers in the lower area of the upper deck where the cabin 10 is arranged. Therefore, the present invention explains efficient use of space by arranging the LNG fuel tank 100 and the fuel gas supply room 210 in the lower area of the cabin 10, where it is difficult to load containers.

The LNG fuel tank 100 may be equipped with an appropriate level of insulation and sealing system to accommodate cryogenic LNG, and may be a membrane-type or independent tank that is widely used in the field of liquefied gas storage tanks.

The fuel gas supply room 210 is a space where various devices for supplying fuel gas from an LNG tank to a propulsion device (eg, a gas injection engine) are placed. Various devices placed in the fuel gas supply room 210 convert LNG stored in the LNG fuel tank 100 or boil off gas (BOG) generated from the LNG fuel tank 100 to the temperature and pressure required by the engine. It is heated and pressurized and supplied to the propulsion device.

Various devices disposed in the fuel gas supply room 210 may be a high-pressure pump and vaporizer for processing LNG, a compressor and heat exchanger for processing boil-off gas, etc.

The fuel gas supply room 210 is preferably placed as close to the LNG fuel tank 100 as possible. This is because if the distance between the fuel gas supply room 210 and the LNG fuel tank 100 is long, the length of the pipe transporting LNG becomes long, which may increase heat loss from the insulation of the pipe.

For this purpose, in the present invention, the fuel gas supply room 210 is disposed at the upper part of the LNG fuel tank 100, and is also disposed within a cargo hold provided at the lower side of the cabin 10. As described above, it is difficult to load cargo such as containers on the lower side of the cabin 10, and the fuel gas supply room 210 is preferably placed close to the LNG fuel tank 100. As a result, the cabin 10 ) is used as an arrangement space for the LNG fuel tank (100) and the fuel gas supply room (210).

Specifically, it may further include a second deck installed to be spaced apart from the lower part of the upper deck inside the cargo hold provided in the lower part of the cabin 10. And the fuel gas supply room 210 may be placed on the second deck.

The LNG fuel tank 100 is disposed on the lower side of the second deck, and a cofferdam 20 is disposed between the LNG fuel tank 100 and the second deck. The cofferdam 20 can isolate the LNG fuel tank 100 and the fuel gas supply room 210 from each other to minimize their influence on each other. The cofferdam 20 refers to a structure in which an empty space, that is, a void space, is formed between a pair of bulk heads.

Meanwhile, a tank connection space (220), a dry powder room (230), and a bunkering station (240) may be further disposed on the second deck. The tank connection part 220 is located at the top of the LNG fuel tank 100, the dry powder room 230 stores dry powder and nitrogen for fire suppression, and the bunkering station 240 is located at the top of the LNG fuel tank 100. It is placed on the upper side and can bunker LNG into the LNG fuel tank 100 from the outside.

The tank connection part 220 is an area provided for connection with the LNG fuel tank 100, and is a fuel pipe for supplying LNG or boil-off gas (BOG) from the LNG fuel tank 100 to the propulsion device for propulsion of the ship. (FP) or LNG loading pipe (LP) is connected. In this embodiment, the tank connection part 220 may be provided as an independent, closed space. In this embodiment, the tank connection portion 220 may be disposed between the buckering stations 240 and may be disposed in the middle portion of the second deck. However, it is not limited to this, and may be placed between the fuel gas supply room 210 and the dry powder room 230, if necessary.

The dome 110 formed on the LNG fuel tank 100 is formed to penetrate the cofferdam 20 and the second deck, and accordingly, the upper part of the dome 110 of the LNG fuel tank 100 is inside the tank connection 220. can be located. LNG or boil-off gas (BOG) discharged from the LNG fuel gas through the fuel pipe (FP) or LNG loading pipe (LP) is appropriately processed by the fuel gas supply room 210 and supplied to the propulsion device (e.g., engine). It can be. At this time, a fuel pipe (FP) for supplying fuel gas may be placed on the lower part or side of the hull to supply fuel gas from the fuel gas supply room 210 to the propulsion device.

The tank connection part 220 may have a hatch installed at the top for the inflow and outflow of a cargo pump accommodated inside the LNG fuel tank 100. And the tank connection portion 220 may be disposed in the center portion of the second deck to include a portion of the dome 110 of the LNG fuel tank 100.

The fuel gas supply room 210 may be placed on the starboard (or port) side of the second deck based on the tank connection 220, and the dry powder room 230 may be located on the starboard (or port) side based on the tank connection 220. It can be placed on the opposite side of the supply room.

As the second deck is placed in hazardous areas such as the fuel gas supply room 210 and the tank connection 220 that handle liquefied gas, ventilation, which is an exhaust system, can be applied. That is, the air in the hazardous area disposed on the second deck can be discharged to the outside through the duct trunk (DT) installed on the ceiling in the middle of the hallway of the second deck. The duct trunk DT disposed on the second deck may be disposed between the fuel gas supply room 210 and the tank connection portion 220.

At this time, the duct trunk DT extends from the ceiling in the middle of the hallway of the second deck to the duct trunk DT disposed in the cabin 10, and contaminated gas can be discharged to the outside. For this purpose, a fan room (FR) may be placed within the cabin (10), and the duct trunk (DT) extending from the fan room (FR) extends to the second deck to be located within the danger zone on the second deck side. Air can be discharged.

The bunkering station 240 is provided on the port and starboard sides respectively for ease of operation, anchoring, and proximity of the ship. Bunkering means may be introduced through the side of the bunkering station 240 to perform bunkering work.

When the bunkering station 240 is installed on the upper deck of a ship, containers cannot be loaded into the area by the bunkering station 240, which may reduce the load. In this embodiment, the bunkering station 240 It is placed on the lower side of the upper deck to secure container loading space on the upper deck.

In addition, as described above, if the pipe using LNG becomes longer, heat loss from the pipe may increase, so it is preferable that the bunkering station 240 is also placed close to the LNG fuel tank 100. In this embodiment, the bunkering station 240 is placed adjacent to the top of the LNG fuel tank 100.

The fuel gas supply room 210, tank connection 220, and bunkering station 240 are all areas classified as hazardous areas, and the fuel gas supply room 210, tank connection 220, and bunkering station are classified as hazardous areas. By placing all (240) on the same deck, risk area management can be performed efficiently.

In this embodiment, a lower deck may be disposed between the upper deck and the second deck. The lower deck is located above the second deck and may be arranged to be spaced apart from the second deck. An accommodation machinery room (310) and an electric D/B room (320) may be located in the lower deck. The machine room 310 may be equipped with facilities related to the residential area, and the distribution room 320 may be equipped with electrical system facilities such as transformers and switchboards.

The machine room 310 and the distribution room 320 arranged on the lower deck can be classified as a safety area. Therefore, if a fire or LNG leak occurs in a dangerous area located on the second deck, it is necessary to ensure safety by blocking the dangerous area and the safe area. For this purpose, a single bulkhead, for example, an A-60 bulkhead, can be used on the lower deck to block heat and gases in the event of a fire. The A-60 bulkhead is a bulkhead that guarantees insulation and gas blocking for up to 60 minutes in the event of a fire.

Referring again to FIG. 1, BOG may continuously occur inside the LNG fuel tank 100, causing the pressure within the LNG fuel tank 100 to increase. Preventing the pressure of the LNG fuel tank 100 from increasing. Otherwise, a risk such as explosion may occur, so a vent pipe (VP) may be disposed to discharge gas vaporized in the LNG fuel tank 100.

The vent pipe (VP) extends to the vent mast (VM) disposed at the top of the cabin 10, and gas vaporized in the LNG fuel tank 100 can be discharged to the outside through the vent mast (VM).

According to the IGF Code on safety standards related to LNG-powered ships, the outlet of the vent mast (VM) should generally be located approximately 6 m above the working area and passageway. In addition, since the area up to 10m from the vent mast (VM) is designated as an explosion-proof area, it is difficult for the vent mast (VM) to be installed close to the area where electrical equipment is deployed. In order for electrical equipment to be installed in an explosion-proof area, it must be constructed as explosion-proof, but this is difficult to apply realistically because it increases costs.

Therefore, in this embodiment, the vent mast (VM) is installed on the compass deck, which is the uppermost deck of the cabin 10, and the gas discharged through the vent pipe (VP) extending from the outside of the cabin 10 is Finally, it can be discharged to the outside through the vent mast (VM).

Figure 5 is a plan view showing the upper deck located above the LNG fuel tank in a container ship to which the arrangement structure according to an embodiment of the present invention is applied.

Referring to Figure 5, the upper deck will be described in more detail. On the upper deck, a cabin (10), which is the living space for the crew, is placed. Additionally, a first hatch, a second hatch, and a third hatch may be installed in the side space on the port or starboard side of the cabin 10 on the upper deck. The first hatch is provided to open and close the doorway leading to the fuel gas supply room 210, the second hatch is provided to open and close the doorway leading to the machine room 310, and the third hatch is provided to open and close the doorway leading to the distribution room 320. It may be provided for opening and closing.

Additionally, a ventilator (VT) may be installed at the front and rear of the cabin 10 to supply or exhaust various types of air, respectively. The ventilator (VT) can supply air to a duct trunk (DT), etc.

Figure 6 is a plan view showing the second deck located on the upper side of the LNG fuel tank in a container ship to which the arrangement structure according to an embodiment of the present invention is applied.

Referring to FIG. 6, a tank connection portion 220 is disposed at the center portion in the width direction of the hull on the second deck, and a fuel gas supply room is located on the starboard (or port) side of the hull based on the tank connection portion 220. 210 is placed. Additionally, the dry powder room 230 may be disposed on the opposite side of the fuel gas supply room 210 in the width direction of the hull.

The fuel gas supply room 210 and the dry powder room 230 are arranged on the same line in the width direction of the hull, and the tank connection part 220 is spaced apart from the fuel gas supply room 210 on the rear side of the connecting gas supply room. It can be placed with .

In this embodiment, the tank connection part 220 is placed in a separate room from the fuel gas supply room 210. Therefore, sufficient space around the dome 110 of the LNG fuel tank 100 can be secured, and equipment such as a cargo pump accommodated inside the LNG fuel tank 100 can be introduced into the LNG fuel tank 100. or withdrawal can be implemented efficiently. In addition, an environment is created in which workers can easily install the fuel pipe (FP) or LNG loading pipe (LP) formed in the dome 110 of the LNG fuel tank 100 or easily perform maintenance work on various equipment. It can be.

For reference, looking at Domestic Patent No. 10-1719918, it is disclosed that the tank connection part 220 is installed in the sub space within the fuel gas supply room 210. In this way, the tank connection part 220 is connected to the fuel gas supply room 210. ), the risk of fire or explosion increases, and excessive insulation systems need to be added, so it may not be easy to apply in ISO and actual classification systems.

In this embodiment, the fuel gas supply room 210 and the tank connection part 220 may be provided separately and arranged at intervals between them. At this time, insulation application and risk management for the fuel gas supply room 210 and the tank connection 220 may be performed separately.

Additionally, bunkering stations 240 are placed on the port and starboard sides of the hull, respectively, based on the tank connection portion 220. A pipe trunk (250) provided with a fuel pipe (FP) through which LNG is transferred and an LNG loading pipe (LP) may be disposed between the bunkering station 240 and the tank connection portion 220.

The bunkering station 240 may be placed in contact with the left and right walls of the hull so that the side surface is exposed on the outer wall of the hull. As shown in FIG. 6, the bunkering station 240 may be placed on the path of a side passage way located on the port and starboard sides of the hull. At this time, the side passage may extend in the longitudinal direction of the hull, and as the bunkering station 240 is placed on the route, the side passage may be designed to change its route to bypass the bunkering station 240.

The fuel gas supply room 210, tank connection 220, dry powder room 230, and bunkering station 240 arranged on the second deck may each be provided with an entrance that can be entered and exited through a side passage. Here, a corridor extending from the side passage may be disposed between the entrance and the side passage.

At this time, the entrances to the fuel gas supply room 210, the tank connection 220, and the bunkering station 240, which are placed on the second deck and classified as hazardous areas, may have an air-lock structure. And, if necessary, an emergency escape door along with an airlock structure may be installed in the fuel gas supply room 210 and the tank connection part 220. The emergency escape door may have an inside-lock structure that opens and closes only from the inside.

Since the second deck is equipped with a fuel gas supply room 210 and a tank connection 220 where liquefied gas is moved or liquefied gas is processed, a ventilation system can be installed to discharge the inside air to the outside. there is. That is, the ventilation system can install a duct trunk (DT) to collect leaked gas or air accumulated inside the fuel gas supply room 210 and the tank connection 220 and discharge it to the outside. In this embodiment, the duct system is connected to a duct trunk (DT) in the cabin (10) on one side extending from a fan room (FR) disposed in the cabin (10). And as the fan installed in the fan room (FR) runs, leaked gas or contaminated air collected in the duct trunk (DT) can be discharged to the outside.

Additionally, in this embodiment, the duct trunk DT may be supplied with air drawn in from the ventilator VT installed on the upper deck. This duct trunk (DT) can also be applied to a dry powder room or bunkering station (240).

And the fuel pipe (FP) connected from the tank connection 220 to the fuel gas supply room 210 is placed in the pipe trunk 250, and if the fuel pipe FP leaks, the leaked fuel gas is discharged into the duct trunk ( DT) can be discharged to the outside.

As described above, the specific description of the present invention has been made by way of examples with reference to the accompanying drawings. However, since the above-described embodiments are only explained by referring to preferred examples of the present invention, the present invention is limited to the above examples. It should not be understood, and the scope of rights of the present invention should be understood in terms of the claims and equivalent concepts described later.

10: Cabin 20: Cofferdam
100: LNG fuel tank 110: Dome
210: Fuel gas supply room 220: Tank connection part
230: Dry powder room 240: Bunkering station
250: pipe trunk
310: Machine room 320: Distribution room
FP: Fuel pipe FR: Fan room
DT: Duct trunk LP: LNG loading pipe
VM: Vent Mast VP: Vent Pipe
VT: ventilator

Claims (10)

delete delete delete delete delete delete delete delete Upper deck with cabins located on top;
a second deck installed below the upper deck;
An LNG fuel tank disposed at the lower part of the second deck and storing LNG used as fuel for ships;
One or more devices disposed on the second deck, between the cabin and the LNG fuel tank, and for supplying LNG stored in the LNG fuel tank or boil-off gas generated from the LNG fuel tank to the propulsion device of the ship. A fuel gas supply room where the device is placed;
A cofferdam disposed between the second deck and the LNG fuel tank to isolate the LNG fuel tank and the fuel gas supply room;
A tank connection portion disposed on the second deck and provided with a fuel pipe provided in a separate room from the fuel gas supply room to supply LNG from the LNG fuel tank to the propulsion device of the ship through the fuel gas supply room;
A dome formed on the LNG fuel tank whose upper end is located inside the tank connection portion through the cofferdam and the second deck to supply LNG to the propulsion device of the ship through the fuel gas supply room;
a first duct trunk disposed on the second deck and collecting leaked gas or air generated in the fuel gas supply room and the tank connection to discharge the leaked gas or air to the outside;
a second duct trunk installed in the cabin and extending from a fan room equipped with a fan; and
An LFS system arrangement structure that is installed at least one of the front and rear of the cabin and includes a ventilator that supplies or exhausts air to the first duct trunk. In claim 9,
An LFS system arrangement structure in which the first duct trunk is connected to the second duct trunk.

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