KR102514086B1 - Ventilation Air Supply System and Method for Engine Room - Google Patents

Abstract

The present invention relates to an air supply system and method for ventilation of an engine room capable of effectively supplying ventilation air to a double pipe and a gas valve unit room provided in an engine room of a liquefied gas fueled ship.
An air supply system for ventilation of an engine room according to the present invention is located in the engine room, the fuel gas to be supplied to the engine flows through the inner tube, and the exterior is filled with air; a gas valve unit room provided in the engine room and equipped with a gas valve unit for controlling fuel gas supplied to the engine; an air intake unit for a double pipe that sucks external air as ventilation air to be supplied to the exterior of the double pipe; Ventilation fan for discharging the air inside the gas valve unit room and the air inside the exterior of the double pipe to the outside; an internal air discharge unit for sucking in internal air in the gas valve unit room; an internal air ventilation line connecting the internal air discharge unit and the ventilation fan and discharging the internal air sucked by the internal air discharge unit to the outside through the ventilation fan; and a double pipe ventilation line connecting the exterior of the double pipe and the internal air ventilation line, and discharging air discharged from the exterior of the double pipe to the outside through the ventilation fan.

Description

Ventilation Air Supply System and Method for Engine Room

The present invention relates to an air supply system and method for ventilation of an engine room capable of effectively supplying ventilation air to a double pipe and a gas valve unit room provided in an engine room of a liquefied gas fueled ship.

As international interest in preventing marine air pollution increases, demand for LNG fueled ships (LFS; Liquefied Gas Fueled Ships), which use liquefied natural gas (LNG) as fuel, as a green-ship is increasing. It is increasing. LFS has been approved by the classification society of each country (AIP; Approval In Principle), and meets the demand for conversion to clean energy due to environmental regulations. The application of such an LFS to general merchant ships, including container ships and tanker ships, as well as LNG carriers equipped with LNG storage tanks to transport LNG cargoes, is expanding.

Natural gas is relatively environmentally friendly because it does not produce sulfur compounds and soot when burned due to its low sulfur content. Among the engines used in ships, dual fuel engines that can use natural gas as fuel include ME-GI (MAN Electronic Gas Injection) engines and X-DF (eXtra long stroke Dual Fuel) engines. , DF engines (DFDE (Dual Fuel Diesel Electric), DFDG (Dual Fuel Diesel Generator)).

ME-GI engines are mainly used for propulsion using a 2-stroke cycle. In addition, the ME-GI engine operates based on a diesel cycle in which high-pressure natural gas of about 300 bar is directly injected into a combustion chamber near the top dead center of a piston.

Meanwhile, the X-DF engine is mainly used for propulsion using a 2-stroke cycle, and like the ME-GI engine, a propeller is directly driven for propulsion of a ship. In addition, the X-DF engine uses medium-pressure natural gas of about 16 bar as fuel and operates based on an otto cycle.

A DF engine is mainly used for power generation using a 4-stroke cycle. In addition, the DF engine operates based on the Otto cycle in which low-pressure natural gas of about 6.5 bar is injected into the combustion air inlet and compressed as the piston rises.

3 and 4, the main engine 1 used for propulsion of a gas fueled ship and the power generation engine 11 used for power generation are classified as a dangerous zone in terms of ship safety regulations. It is installed in the engine room (ER). The engine room (ER) is disposed under the upper deck (UD) of the liquefied gas fuel ship.

In addition, a main engine gas valve unit (GVU) 2 used to control liquefied gas fuel required to supply liquefied gas fuel to the main engine 1 and the power generation engine 11 and a power generation engine The gas valve unit room (GR) in which the gas valve unit 12 is installed is also disposed in the engine room (ER), which is a dangerous area, under the upper deck (UD).

In the case of an LFS equipped with an engine using LNG as fuel, gas pipes passing through the engine room (ER) must be composed of double walls (3, 13) as gas is used as fuel.

In addition, the space between the inner pipe and the outer pipe of the double pipe (3, 13), that is, the inside of the outer pipe must be filled with air to prevent various accidents that occur when gas leaks from the inner pipe, and The filling air is provided for ventilation with periodic replacement.

Currently, according to the International Code of Safety for Ships using Gases or other Low-flashpoint Fuels (IGF code), ventilation of the double pipes 3 and 13 is stipulated to be performed 30 times per hour. In addition, it is stipulated that ventilation air should be used by bringing outside air instead of the air in the engine room (ER) or by suctioning air from the cargo area, etc., which is divided into safety areas. there is.

In this way, when outside air is sucked in and used as ventilation air, a condensator may be generated by the temperature of the fuel in the double tubes 3 and 13. Conventionally, a separate drain trap (not shown) is installed so that when a condenser is generated, it is collected in the drain trap to remove the condenser.

Similarly, since the gas valve unit room (GR) is also disposed in the engine room, which is a dangerous area, ventilation fans (F2, F21) for the gas valve unit room are provided to replace the internal air in the gas valve unit room (GR) 30 times per hour. Ventilation work is being carried out.

On the other hand, in the conventional LNG fuel ship, the length of the double pipes (3, 13) provided in the engine room (ER) is long, so the pressure drop (pressure drop) takes a lot, so the air is not smoothly ventilated to solve the problem that occurs. For this purpose, ventilation fans F1 and F12 for double pipes and ventilation fans F2 and F21 for gas valve unit rooms are separately provided and used.

Therefore, the present invention is to solve the above-mentioned problems, for ventilation of the engine room to prevent the condensator generated in the double pipe from being generated, and to use the ventilation fan for the double pipe and the ventilation fan for the gas valve unit in combination. It is intended to provide an air supply system and method.

According to one aspect of the present invention for achieving the above object, located in the engine room, the fuel gas to be supplied to the engine flows through the inner pipe, the exterior is filled with air double pipe; a gas valve unit room provided in the engine room and equipped with a gas valve unit for controlling fuel gas supplied to the engine; an air intake unit for a double pipe that sucks external air as ventilation air to be supplied to the exterior of the double pipe; Ventilation fan for discharging the air inside the gas valve unit room and the air inside the exterior of the double pipe to the outside; an internal air discharge unit for sucking in internal air in the gas valve unit room; an internal air ventilation line connecting the internal air discharge unit and the ventilation fan and discharging the internal air sucked by the internal air discharge unit to the outside through the ventilation fan; And a double pipe ventilation line connecting the exterior of the double pipe and the internal air ventilation line, and discharging air discharged from the exterior of the double pipe to the outside through the ventilation fan; including, an air supply system for ventilation of the engine room Provided.

Preferably, an internal air suction unit for sucking and supplying internal air in the gas valve unit room to the exterior of the double tube, further comprising a position where the internal air intake unit is connected to the exterior of the double tube and the double tube ventilation line. and may be provided on the opposite side.

Preferably, two or more engines are provided, a double pipe is connected to each of the two or more engines, and the air flow is not deflected to the double pipe connected to any one of the two or more engines in the internal air intake part. An orifice valve may be provided to maintain a balance so as not to

Preferably, an internal air heater for heating internal air in the gas valve unit room may be further included.

Preferably, two or more engines are provided, a double pipe is connected to each of the two or more engines, and the air flow is deflected to a double pipe connected to any one of the two or more engines in the air intake for the double pipe. An orifice valve may be provided to maintain a balance so as not to

Preferably, the internal air discharge unit may be provided at an upper end of the gas valve unit room.

Preferably, an internal air discharge duct having one end communicating with the upper deck and the other end extending to the inner floor of the gas valve unit room; further comprising, wherein the internal air discharge unit is in the internal air discharge duct It may be provided at the bottom.

Preferably, an external air heater for heating external air that is sucked through the air intake for the double pipe and supplied to the exterior of the double pipe; may further include.

According to another aspect of the present invention for achieving the above object, outside air is sucked in and supplied to the exterior of the double pipe in the engine room as ventilation air, and the inside air from the gas valve unit room provided adjacent to the double pipe And there is provided a ventilation air supply method of the engine room, which exhausts the ventilation air from the exterior of the double pipe to the outside using a single fan.

Preferably, the air inside the gas valve unit room may be sucked in and supplied as ventilation air to the exterior of the double pipe.

Preferably, the internal air in the gas valve unit room can be maintained at a temperature range in which a normal operating range of the gas valve unit is possible.

An air supply system and method for ventilation of an engine room according to the present invention prevents a condensator from being generated in a double pipe installed in an engine room of a liquefied gas fueled ship, so that a drain conventionally installed to remove the condensator There is no need to provide traps.

In addition, since it is not necessary to separately provide a ventilation fan for a double pipe and a ventilation fan for a gas valve unit, equipment configuration can be simplified and space efficiency can be increased.

In addition, since air heated in the gas valve unit room or air heated using a heater can be supplied as air for ventilation of the double pipe, it is possible to supply air with high dryness to prevent corrosion of pipes and equipment, and condensate can prevent this from happening.

In addition, when the engine is operated in a mode in which boil-off gas of fuel oil is used as fuel, a phase change of boil-off gas can be prevented by supplying heated air to the ventilation air of the double pipe.

In addition, an orifice valve is provided in the internal air inlet and the external air inlet in the gas valve unit room, so that when two or more engines are provided, ventilation air flow is generated only in one engine by the discharge fan. In this case, it is possible to sufficiently satisfy the flow balancing of ventilation air.

1 is a view for explaining an air supply system for main engine side ventilation according to an embodiment of the present invention.
2 is a view for explaining an air supply system for ventilation on the power generation engine side according to an embodiment of the present invention.
3 is a view for explaining a conventional main engine-side ventilation air supply system.
4 is a view for explaining a conventional air supply system for ventilation on the power generation engine side.

In order to fully understand the operational advantages of the present invention and the objects achieved by the practice of the present invention, reference should be made to the accompanying drawings illustrating preferred embodiments of the present invention and the contents described in the accompanying drawings.

Hereinafter, the configuration and operation of a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. In adding reference numerals to the components of each drawing, it should be noted that the same components are marked with the same numerals as much as possible, even if they are displayed on different drawings.

Hereinafter, in the ship of the present invention, an engine capable of using liquefied gas and boil-off gas generated from liquefied gas as fuel for any one or more of a main propulsion engine and a power generation engine is installed, or liquefied gas or boil-off gas is used as fuel for an engine in a ship. As all types of liquefied gas fueled ships (LFS), ships equipped with engines that use liquefied gas as fuel have self-propelled capabilities such as LNG carriers, liquid hydrogen carriers, and LNG RVs (Regasification Vessel). In addition to vessels with propulsion capabilities, offshore structures floating on the sea, such as LNG FPSO (Floating Production Storage Offloading) and LNG FSRU (Floating Storage Regasification Unit), may also be included.

In addition, in an embodiment of the present invention described later, liquefied gas can include all types of liquefied gas that can be transported by liquefying the gas at a low temperature, generate boil-off gas in a stored state, and can be used as fuel for engines and the like. can These liquefied gases are, for example, liquefied petrochemicals such as LNG (Liquefied Natural Gas), LEG (Liquefied Ethane Gas), LPG (Liquefied Petroleum Gas), liquefied ethylene gas, and liquefied propylene gas. may be gas. However, in an embodiment to be described later, an example in which LNG, which is one of representative liquefied gases, is applied will be described.

In addition, in one embodiment of the present invention to be described later, the engine may be a dual fuel engine capable of selectively or mixedly using fuel oil and natural gas as fuel, and may include a high-pressure gas injection engine, a medium-pressure gas injection engine, and a low-pressure gas injection engine. Any one or more of the engines may be included.

The high-pressure gas injection engine will be described as an example of an engine using gas fuel of about 100 bar to 400 bar, or about 150 bar or more, preferably about 300 bar, for example, an ME-GI engine. In addition, the medium pressure gas injection engine may be an engine using gas fuel of about 10 bar to 20 bar, preferably about 16 bar, for example, an X-DF engine, and the low pressure gas injection engine may be about 5 bar to 10 bar , preferably an engine using gas fuel of about 6.5 bar, for example, a DF engine, a DFDG engine, or a DFGE engine.

In an embodiment of the present invention to be described later, the engine includes a main propulsion engine and a power generation engine, and an example in which the ME-GI engine is applied as the main propulsion engine and the DFGE is applied as the power generation engine will be described as an example.

Hereinafter, an air supply system and method for ventilation of an engine room according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2 .

1 and 2, it is provided in the engine room (ER) where the engines 1 and 11 are provided, and fuel gas to be supplied to the engines 1 and 11 from a fuel supply unit (not shown) is supplied to the inner tube. The gas valve unit 2 for controlling the fuel gas supplied to the engines 1 and 11 from the fuel supply unit provided in the engine room ER and the double pipes 3 and 13 flowing through and filled with air on the exterior. , 12), a gas valve unit room (GR) provided, a double pipe air intake unit (8, 18) for sucking in external air as ventilation air to be supplied to the exterior of the double pipe (3, 13), and a gas valve unit room Ventilation air to be supplied to GR is supplied by sucking and supplying internal air in the gas valve unit room (GR) to the exterior of the air inlet (9, 19) for internal air that sucks in external air and the double pipe (3, 13). and ventilation fans 5 and 15 for discharging the internal air in the gas valve unit room GR and the air in the exterior of the double tubes 3 and 13 to the outside.

The engine room (ER) of this embodiment is located in the lower part of the upper deck (UD), and the air intake parts (8, 18) for double pipes and the air intake parts (9, 19) for internal air are located above the upper deck (UD). can be located

In addition, in this embodiment, the engines 1 and 11 may include at least one of a main engine 1 for propulsion and a power generation engine 11 for power generation. In addition, the main engine 1 and the power generation engine 11 may be a dual-fuel engine that can selectively use or mix gas and fuel oil as fuel.

In the drawing, the double tubes 3 and 13 are shown as being provided only outside the engines 1 and 11 in the engine room ER, but the double tubes 3 and 13 extend to the internal combustion chambers of the engines 1 and 11 and are provided. The double tubes 3 and 13 extending to the inside of the engines 1 and 11 must also be equipped with an air ventilation system.

In addition, one or more of the main engine 1 and the power generation engine 11 may be provided. 1 shows that two main engines 1 are provided as an example, FIG. 2 shows that two power generation engines 11 are provided as an example, and in this embodiment, the main engine 1 and the power generation engine (11) will be described as an example in which two units are provided.

1 shows a schematic configuration of an air supply system for ventilation of an engine room according to a first embodiment of the present invention in which a main engine 1 and a gas valve unit room for the main engine (GR) are provided in an engine room (ER). FIG. 2 shows ventilation air in the engine room according to the second embodiment of the present invention, in which the engine room (ER) is provided with a power generation engine 11 and a gas valve unit room (GR) for the power generation engine. A schematic diagram of the supply system is shown.

According to one embodiment of the present invention, both the case where the main engine 1 is provided in the engine room ER as shown in FIG. 1 and the case where the power generation engine 2 is provided as shown in FIG. 2 Since the same can be applied, hereinafter, the case where the main engine 1 and the power generation engine 2 are provided will be described without being particularly distinguished.

According to this embodiment, outside air is drawn in through the air intakes 8 and 18 for double pipes and the air intakes 9 and 19 for internal air, and the exterior of the double pipes 3 and 13 and the gas valve unit room (GR) ), according to safety regulations, for example 30 times per hour, ventilation can be carried out.

Although not shown in the drawings, the air intakes 8 and 18 for double pipes and the air intakes 9 and 19 for internal air are provided with flame screens to prevent flames from spreading in the event of a fire. should be installed.

The air inlets 8 and 18 for the double pipe in this embodiment are provided with orifice valves.

When two or more engines 1 and 11 are provided as in the present embodiment, when the ventilation fans 5 and 15 operate, one engine 1 or 11 among the two or more engines 1 and 11 operates. In order to prevent a problem in which only the air flow to the applied double pipe (3, 13) or the air flow from the double pipe (3, 13) applied to either engine (1, 11) occurs, the air intake for the double pipe ( By providing orifice valves in 8 and 18, it is possible to maintain air flow balancing of the entire double tubes 3 and 13 applied to two or more engines 1 and 11.

Meanwhile, the air intakes 9 and 19 for internal air of this embodiment may be dampers.

In this embodiment, the outside air sucked through the air intakes 8 and 18 for double pipes and the air intakes 9 and 19 for inside air is a non-hazardous open area according to ship regulations such as cargo space (cargo space) Air that is inhaled from a place defined as a non-hazardous open area).

The air intakes 8 and 18 for the double pipe of this embodiment are connected to the engines 1 and 11 through external air supply lines SL1 and SL2.

The external air sucked through the double pipe air intakes 8 and 18 is supplied to the double pipe (not shown) in the engine 1 and 11 through the external air supply lines SL1 and SL2, and then the engine 1 and 11 ) It is discharged to the double pipe ventilation lines (VL1, VL2) through the exterior of the double pipe (3, 13) extending to the outside.

A gas detector (GD) for detecting a gas component is provided in the external air supply lines (SL1, SL2) of this embodiment, so that gas leakage can be detected.

1 and 2, in order to help the understanding of an embodiment of the present invention, the arrow and the letter 'VENT' are written together to indicate the flow direction of air for ventilation.

The external air supply lines SL and SL2 of this embodiment may be provided with external air heaters 6 and 16 for heating the external air sucked through the double pipe air intakes 8 and 18 .

In this embodiment, the outside air heaters 6 and 16 may be electric heaters.

When the humidity of the air sucked through the double pipe air inlet (8, 18) is higher than the set reference value, or the temperature of the outside air is low enough to cause a phase change of the fuel gas flowing through the inner pipe of the double pipe (3, 13), Ventilation air with high dryness can be supplied by operating the outside air heaters 6 and 16 to heat the outside air.

In this way, when the outside air is heated and supplied, the dryness can be increased to prevent corrosion of the internal device, and since the high-temperature ventilation air is supplied to the exterior of the double pipe (3, 13), the generation of condensate itself can be prevented. It can be prevented.

When ventilation air is supplied from the engine (1, 11) to the exterior of the double tube (3, 13), the previously filled air is transferred to the double tube ventilation connecting the exterior of the double tube (3, 13) and the ventilation fan (5, 15). It is discharged to the outside through the lines VL1 and VL2.

The double tube ventilation lines VL1 and VL2 of this embodiment are connected to the internal air ventilation lines RL1 and RL2 described later, and the air discharged from the exterior of the double tubes 3 and 13 passes through the internal air ventilation lines RL1 and RL2 It may be configured to be discharged to the ventilation fan (5, 15) through.

The gas valve unit room GR of this embodiment can ventilate the inside by sucking outside air through the air intakes 9 and 19 for inside air.

The gas valve unit room GR is provided with internal air heaters 7 and 17 for heating air in the gas valve unit room GR.

Since the gas valve unit room GR is in communication with the outside air by the air intakes 9 and 19 for the inside air, by heating the inside air using the inside air heaters 7 and 17, the gas valve unit room The air in (GR) can be maintained in a temperature range capable of operating the gas valve units (2, 12).

The internal air in the gas valve unit room (GR) is sucked in through the internal air outlets (10, 20) provided in the gas valve unit room (GR), and the internal air outlets (10, 20) and the ventilation fan (5) , 15) can be discharged to the outside along the internal air ventilation lines RL1 and RL2.

The ventilation fans 5 and 15 of this embodiment may be provided on the casing b deck (BD) of the ship, and in particular, the ship's steering gear room (not shown) and engine room (ER). ), it may be located on the rear side of the engine room (ER).

In addition, according to the present embodiment, on the exterior of the double tubes 3 and 13, the internal air intake parts 4 and 14 for supplying the internal air in the gas valve unit room GR to the exterior of the double tubes 3 and 13 may be provided.

The internal air inlet (4, 14) is a double pipe ventilation line (VL1, VL1, VL2) may be provided on the opposite side of the position provided.

An orifice valve may be provided at the internal air inlet (4, 14), and the air flow of the entire double pipe (3, 13) applied to the two or more engines (1, 11) is not deflected by the orifice valve. flow balance can be maintained.

Since the internal air in the gas valve unit room (GR) is heated by the internal air heaters (7, 17) and the temperature is kept constant, the air in the gas valve unit room (GR) is removed from the exterior of the double pipes (3, 13). is supplied as ventilation air, so condensate does not occur.

On the other hand, when the engines 1 and 11 operate in a fuel oil mode in which fuel oil (crude oil) is naturally vaporized and uses VOC as fuel oil, outside air sucked in through the intake parts 8 and 18 for double pipes is also , It can be heated using the outside air heaters (6, 16) and supplied to the exterior of the double tubes (3, 13).

Since gaseous VOC changes to liquid at 40° C. or lower, ventilation air supplied to the exterior of the double tubes 3 and 13 is heated and supplied so that VOC can be maintained in gaseous state without phase change.

On the other hand, the internal air discharge units 10 and 20 of this embodiment may be provided on the upper side of the gas valve unit room GR as shown in FIG. 1, and as shown in FIG. 2, the gas valve unit room It may be provided in the inner air discharge duct (DT) of (GR).

The internal air discharge duct (DT) has one end communicating with the upper deck (UD) and the other end extending close to the bottom of the gas valve unit room (GR), which is This is to pull the discharged passage down to the bottom of the gas valve unit room (GR) to suck in and discharge the air below the gas valve unit room (MGR, GGR).

Conventionally, as shown in FIGS. 3 and 4, ventilation fans (F1, F11) for double pipes and ventilation fans (F2, F21) for gas valve unit rooms were separately provided to ventilate the engine room. However, according to one embodiment of the present invention, as shown in FIGS. 1 and 2, the internal air intakes 10 and 20 are disposed in the gas valve unit room GR, and the double pipe ventilation lines VL1 and VL2 and the internal air ventilation lines (RL1, RL2) are connected, so that one ventilation fan (5, 15) is integrated and used.

In addition, according to one embodiment of the present invention, in order to balance the flow of air, as shown in FIGS. 1 and 2, the double pipe air intake parts 8 and 18 for sucking outside air and the gas valve unit room ( GR) is provided with internal air intakes (4, 14) for sucking in air, and orifice valves are provided in the air intakes (8, 18) and internal air intakes (4, 14) for the double pipe, respectively, so that the double pipe ( 3, 13) to sufficiently satisfy the flow balancing of the external air supplied to the exterior and the internal air in the gas valve unit room (GR).

According to one embodiment of the present invention, the outside air sucked through the double pipe air intakes (8, 18) is transferred from the engine (1, 11) through the exterior of the double pipe (3, 13) to the ventilation fan (5, 15). Ventilation fan (5 , 15) can be discharged to the outside.

In addition, the present invention prevents condensate from occurring by providing external air heaters (6, 16) to supply air with a high dryness as ventilation air, instead of a trap previously installed to remove condensate. Corrosion prevention was aimed at.

In this way, the present invention eliminates the conventional double pipe ventilation fan, changes the flow direction of ventilation air, and arranges the internal air intakes 10 and 20 and the internal air ventilation lines RL1 and RL2, so that one Ventilation of the gas valve unit room (GR) and the double pipe (3, 13) can be effectively performed using the ventilation fans (5, 15) for the gas valve unit, and also, by arranging the external air heaters (6, 16) Corrosion of equipment can be prevented by using air with high dryness as ventilation air.

It is obvious to those skilled in the art that the present invention is not limited to the above embodiments and can be variously modified or modified without departing from the technical gist of the present invention. it did

1, 11: engine
2, 12: gas valve unit
3, 13: double pipe
4, 14: internal air intake
5, 15: ventilation fan
6, 16: external air heater
7, 17: internal air heater
8, 18: air intake for double pipe
9, 19: air inlet for internal air
10, 20: internal air discharge unit
UD: Upper deck
BD : Casing rain deck
ER: engine room
GR : Gas valve unit room
DT; Internal air exhaust duct
SL1, SL2: External air supply line
VL1, VL2: Double pipe ventilation line
RL1, RL2: Internal air ventilation line

Claims (11)

A double pipe located in the engine room, through which fuel gas to be supplied to the engine flows through the inner pipe, and filled with air on the exterior;
a gas valve unit room provided in the engine room and equipped with a gas valve unit for controlling fuel gas supplied to the engine;
an air intake unit for a double pipe that sucks external air as ventilation air to be supplied to the exterior of the double pipe;
Ventilation fan for discharging the air inside the gas valve unit room and the air inside the exterior of the double pipe to the outside;
an internal air discharge unit for sucking in internal air in the gas valve unit room;
an internal air ventilation line connecting the internal air discharge unit and the ventilation fan and discharging the internal air sucked by the internal air discharge unit to the outside through the ventilation fan; and
A double pipe ventilation line connecting the exterior of the double pipe and the internal air ventilation line, and discharging air discharged from the exterior of the double pipe to the outside through the ventilation fan;
In the exterior of the double pipe, an internal air intake unit for sucking and supplying internal air in the gas valve unit room; further comprising,
The internal air intake unit is provided on the opposite side of the exterior of the double pipe to the position where the double pipe ventilation line is connected, the air supply system for ventilation of the engine room. delete The method of claim 1,
Two or more engines are provided,
The two or more engines are connected to each of the double pipes,
An orifice valve for maintaining a balance so that air flow is not deflected to a double pipe connected to any one of the two or more engines is provided in the internal air intake, the air supply system for ventilation of the engine room. The method of claim 1,
An air supply system for ventilation of an engine room further comprising an internal air heater for heating internal air in the gas valve unit room. The method of claim 1,
Two or more engines are provided,
The two or more engines are connected to each of the double pipes,
An orifice valve for maintaining a balance so that the air flow is not deflected to the double pipe connected to any one of the two or more engines in the air intake for the double pipe, the air supply system for ventilation of the engine room. The method of claim 1,
The internal air discharge unit is provided at an upper side in the gas valve unit room, an air supply system for ventilation of the engine room. The method of claim 1,
An internal air discharge duct having one end in communication with the upper deck and the other end extending to the inner floor of the gas valve unit room; further comprising,
The internal air discharge unit is provided at the bottom of the internal air discharge duct, the air supply system for ventilation of the engine room. The method of claim 1,
An air supply system for ventilation of an engine room further comprising: an external air heater for heating external air that is sucked in through the air intake for the double pipe and supplied to the exterior of the double pipe. External air is sucked in and supplied to the exterior of the double pipe in the engine room as ventilation air,
Internal air from the gas valve unit room provided adjacent to the double pipe and ventilation air from the exterior of the double pipe are discharged to the outside using one fan,
A method of supplying air for ventilation in an engine room by sucking in air inside the gas valve unit room and supplying air for ventilation to the exterior of the double pipe. delete The method of claim 9,
Internal air in the gas valve unit room is maintained in a temperature range that allows the normal operating range of the gas valve unit, ventilation air supply method of the engine room.

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