JP7016978B2 - Ship - Google Patents

Description

The present invention relates to a ship.

As a ship equipped with a main engine such as a diesel engine, a ship having an air supply duct and an exhaust duct to ventilate the engine room is known (see, for example, Patent Document 1). In the ship, combustion air is supplied to the engine room of the ship through an air supply duct, and air including hot air generated in the engine room is discharged to the outside of the hull.

Japanese Unexamined Patent Publication No. 2014-184941

By the way, in the field of ships, emission regulations for harmful substances such as sulfur oxides (SOx) and air pollutants tend to be tightened, and ships using fuels containing almost no sulfur content are desired.

However, fuel containing almost no sulfur such as liquefied petroleum gas (LPG, Liquid Petroleum Gas) has a higher specific gravity than air when vaporized, so if it leaks from the piping supplied to the engine room, it should occur in the engine room. There is a concern that it will not be discharged from the engine and will stay in the engine room.

It is an object of the present invention to provide a ship capable of easily ventilating at the time of leakage even when a fuel having a specific density higher than that of air is used when vaporized.

According to the first aspect of the present invention, the ship has a hull having an engine chamber inside, and a main engine provided in the engine chamber and driven by a fuel having a specific gravity higher than that of air when vaporized. An exhaust duct provided in the engine room and having a floor that divides the engine room into a plurality of floors, an exhaust introduction port that opens toward the floor, and an exhaust discharge port that opens outside the hull, and the above-mentioned An exhaust fan provided in the exhaust duct and sucking so that the upper surface of the floor has a negative pressure through the exhaust introduction port, an air supply / discharge port opened in the engine room, and an opening outside the hull. An air supply duct having an air supply inlet, and an air supply fan provided in the air supply duct to introduce air outside the hull into the engine room through the air supply inlet. The exhaust duct and the air supply / exhaust duct are integrally formed as an air supply / exhaust duct. The air supply / exhaust duct main body is provided with an air supply / exhaust duct extension portion extending along the ceiling, and the air supply / exhaust duct main body is provided with the exhaust inlet opening at the lower part of the lowest floor among the plurality of floors of the engine room. The exhaust introduction port that opens at the bottom of the lowest floor is provided with an opening / closing device that opens and closes the exhaust introduction port.

According to such a configuration, even when a fuel having a specific density higher than that of air when vaporized is used as the fuel of the main engine, the gas containing the vaporized fuel accumulated on the upper surface of the floor is discharged to the outside of the hull. be able to.

According to the first aspect of the present invention, the floor is a scaffold fixed to the main engine and having a through hole, and the exhaust introduction port is open below the through hole of the scaffold. good.
According to such a configuration, the gas containing the vaporized fuel accumulated in the scaffold can be discharged to the outside of the hull through the through hole.

In the first aspect of the present invention, the ship may be provided with a seal air ejection device that ejects seal air so as to push the gas on the scaffold back toward the main engine.

According to such a configuration, the gas accumulated in the scaffold can be retained on the scaffold and the gas can be prevented from diffusing into the ship.

In the first aspect of the present invention, the ship is arranged at the exhaust / discharge port of the air supply / exhaust duct, and by rotating in one direction, air outside the hull is introduced into the engine chamber and the air outside the hull is introduced in the other direction. A reversible fan having an impeller that discharges air in the engine chamber to the outside of the hull by rotation may be provided.

With such a configuration, it is possible to manufacture a system for ventilating the engine room at low cost.

In the first aspect of the present invention, the ship is provided with a supercharger driven by the energy of the exhaust gas of the main engine and a main engine air supply duct that communicates the supercharger with the outside of the hull. You can do it.

According to such a configuration, by providing the main engine air supply duct for the turbocharger independently of the air supply duct, it becomes easy to balance the air supply and the exhaust by the air supply duct and the exhaust duct. be able to.

In the first aspect of the present invention, the fuel may be liquefied petroleum gas.
According to such a configuration, since the liquefied petroleum gas contains almost no sulfur content, the ship can be suitable for measures against sulfur oxides (SOx).

According to the present invention, even when a fuel having a specific density higher than that of air when vaporized is used as the fuel of the main engine, the gas containing the vaporized fuel accumulated on the upper surface of the floor can be discharged to the outside of the hull. can.

It is sectional drawing seen from the stern direction of the ship of the 1st Embodiment of this invention. It is an enlarged sectional view seen from the stern direction of the ship of the 2nd Embodiment of this invention. It is sectional drawing seen from the stern direction of the ship of the 3rd Embodiment of this invention.

[First Embodiment]
Hereinafter, the ship according to the first embodiment of the present invention will be described in detail with reference to the drawings.
As shown in FIG. 1, the ship 1 of the present embodiment is driven by the energy of the hull 2 having the engine room 3 inside, the main engine 4 provided in the engine room 3, and the exhaust gas of the main engine 4. It includes a supercharger 14, an air supply duct 5 for supplying combustion air to the engine room 3, an exhaust duct 8 for discharging the gas in the engine room 3, and a control device 28. The air supply duct 5 and the exhaust duct 8 are formed independently.
The air supply duct 5 and the exhaust duct 8 function as a system for ventilating the engine room 3.
In the following description, the direction orthogonal to the paper surface of FIG. 1 is referred to as the stern direction of the ship 1. The left-right direction of FIG. 1 is defined as the width direction W of the ship 1.

The hull 2 has a main body portion 12 and a bridge portion 13. The bridge portion 13 is provided so as to project upward at the center of the main body portion 12 in the width direction W.

The main engine 4 is, for example, a diesel engine. The spindle of the main engine 4 rotates a propeller (not shown). Vessel 1 is equipped with a generator, a boiler and the like (not shown) as auxiliary equipment.
The main engine 4 has a spindle accommodating portion 15 accommodating a spindle and a cylinder portion 16 accommodating a plurality of cylinders. A piston is housed in each cylinder. The main shaft of the main engine 4 extends in the stern direction. A plurality of cylinders are arranged in the stern direction.

Vessel 1 has a main engine air supply duct 11 that introduces air outside the hull 2 into the turbocharger 14. The main engine air supply duct 11 is a tubular member extending in the vertical direction, the upper end of which is open to the outside of the hull 2, and the lower end of which is connected to the supercharger 14.

The fuel of the main engine 4 is liquefied petroleum gas (LPG, Liquid Petroleum Gas). LPG is a gas fuel containing propane, butane and the like as main components. That is, the main engine 4 is driven by LPG.
LPG is vaporized at room temperature and at atmospheric pressure. LPG has a higher specific density than air when vaporized. That is, the vaporized LPG has a property of staying downward.
The fuel of the main engine 4 is not limited to LPG, and methanol, ethanol, dimethyl ether and the like can also be used.

A plurality of floors 18 are provided inside the engine room 3. The interior of the engine room 3 is layered by a plurality of floors 18. The floor 18 divides the engine room 3 into a plurality of floors 19. The floor 18 extends from the inner surface 2a of the hull 2 toward the center of the width direction W of the hull 2. The main surface of the floor 18 is orthogonal to the vertical direction.

Further, the main engine 4 is provided with a scaffold 20 that functions as a floor. The scaffold 20 is fixed to the main engine 4. The scaffold 20 is provided near the center of the main engine 4 extending in the stern direction in the vertical direction. The scaffold 20 extends in the stern direction along the side surface of the main engine 4. A handrail 21 is provided at the end of the scaffold 20. The scaffold 20 can be formed by, for example, a wire mesh. The main surface of the scaffold 20 is orthogonal to the vertical direction.

The air supply duct 5 is a circular tubular or rectangular tubular member extending in the vertical direction. The upper end of the air supply duct 5 is an air supply introduction port 6 for introducing air outside the hull 2. That is, the air supply duct 5 communicates with the outside of the hull 2. The air supply duct 5 extends in the vertical direction in the main body 12 so as to avoid the main engine 4.
The lower end of the air supply duct 5 is located near the back of the bottom floor 18.

The air supply duct 5 has a plurality of air supply / discharge ports 7 that open in the engine room 3. The air supply / discharge port 7 is arranged at the upper part of each floor 19 so as to blow the outside air of the hull 2 downward.
Further, the air supply / discharge port 7B for the main engine 4 is arranged so as to blow the air outside the hull 2 toward the main engine 4.

The air supply duct 5 has an air supply fan 23 provided in the air supply duct 5. The air supply fan 23 has a motor and an impeller rotated by the motor, and is a device that supplies energy to the gas in the air supply duct 5. The air supply fan 23 introduces the air outside the hull 2 into the engine room 3.

The exhaust duct 8 is a circular or rectangular tubular member extending along the inner surface of the hull 2. The upper end of the exhaust duct 8 is an exhaust discharge port 10 that opens outside the hull 2 to discharge gas. That is, the exhaust duct 8 communicates with the outside of the hull 2. The exhaust duct 8 opens toward the floor 18 in the engine room 3 and has a plurality of exhaust introduction ports 9 for taking in the gas in the engine room 3.

The exhaust duct 8 has an exhaust fan 24 provided in the exhaust duct 8. The exhaust fan 24 is a device having a motor and an impeller and supplying energy to the gas in the exhaust duct 8. The exhaust fan 24 is explosion-proof, and components such as a motor and an impeller are made of a material such as aluminum that does not easily generate sparks. Further, the exhaust fan 24 is provided with a ground terminal in order to prevent static electricity from being charged. The exhaust fan 24 discharges the gas in the engine room 3 to the outside of the hull 2.
The exhaust fan 24 sucks gas so that the upper surface of the floor 18 has a negative pressure.

A gas detector 27 is arranged on the downstream side of the exhaust fan 24. The gas detector 27 is a sensor that detects whether or not the gas flowing through the exhaust duct 8 contains the flammable gas of LPG.
The gas detector 27 is electrically connected to the control device 28, and the control device 28 refers to the concentration of combustible gas measured by the gas detector 27.
Further, the control device 28 is electrically connected to the exhaust fan 24. The control device 28 controls to increase the rotation speed of the exhaust fan 24 when the concentration of the combustible gas detected by the gas detector 27 becomes a predetermined value or more.

The exhaust duct 8 has an exhaust duct first portion 8a arranged in the bridge portion 13, an exhaust duct second portion 8b arranged in the main body portion 12, and an exhaust duct third portion 8c. The exhaust duct first part 8a, the exhaust duct second part 8b, and the exhaust duct third part 8c are connected in series.
The exhaust duct first part 8a extends in the vertical direction at the bridge portion 13. The second exhaust duct portion 8b extends in the width direction W along the lower surface of the deck 12a of the main body portion 12. The third portion 8c of the exhaust duct extends along the inner surface 2a of the side surface of the main body portion 12.

The exhaust introduction port 9 is open at the lower part of each floor 19. Here, the lower part of each floor 19 is a range from the upper surface of the floor 18 to H / 3, where H is the height of the floor 19.
The exhaust introduction port 9 opens toward the center of the width direction W of the ship 1. That is, the exhaust introduction port 9 has a shape that makes it easy to take in the gas flowing from the center of the width direction W of the ship 1 toward the outside of the width direction W.
Although FIG. 2 shows only a pair of air supply ducts 5 and exhaust ducts 8, a plurality of air supply ducts 5 and exhaust ducts 8 are arranged in the stern direction.

Here, paying attention to the top floor 19A on one side of the ship 1, the supply air discharge port 7 and the exhaust introduction port 9 corresponding to this floor 19A are configured to ventilate air in cooperation with each other. ..
Specifically, air is discharged toward the outside of the hull 2 in the width direction W from the supply air discharge port 7A arranged near the center of the hull 2 in the width direction W. The gas containing air discharged from the supply air discharge port 7A is taken in from the exhaust introduction port 9A arranged outside the width direction W of the hull 2. That is, the exhaust introduction port 9A is arranged in the direction in which air is discharged from the supply air discharge port 7A. As a result, ventilation can be performed efficiently.

Next, the operation of the air supply duct 5 and the exhaust duct 8 of the ship 1 of the present embodiment will be described.
When the gas vaporized by LPG leaks from the main engine 4 or the supercharger 14, the gas collects on the upper surface of the floor 18 because the LPG is a fuel having a higher specific density than air when vaporized. In other words, the vaporized LPG stays on board without being discharged upwards.
The upper surface of the floor 18 is negatively pressured by the exhaust fan 24 of the exhaust duct 8. As a result, the gas stored on the upper surface of the floor 18 is introduced into the exhaust duct 8 through the exhaust introduction port 9. The gas introduced into the exhaust duct 8 is discharged to the outside of the hull 2 through the exhaust discharge port 10.

According to the above embodiment, even when a fuel having a specific gravity larger than that of air when vaporized such as LPG is used as the fuel of the main engine 4, the hull 2 contains a gas containing the vaporized fuel accumulated on the upper surface of the floor 18. Can be discharged to the outside of.

Further, by providing an air supply duct 5 having an air supply fan 23 to actively supply air outside the hull 2, the supply air and the exhaust air are balanced, and the inside of the engine room 3 is maintained. The environment such as the temperature of the air can be kept optimal.

Further, by opening the exhaust introduction port 9 of the exhaust duct 8 to the lower part of the floor 18 of each floor 19, the gas containing vaporized fuel accumulated in the lower part of the floor 18 of each floor 19 can be discharged to the outside of the hull 2. can.

Further, by providing the main engine air supply duct 11 for the turbocharger 14 independently of the air supply duct 5, it is easy to balance the air supply and the exhaust gas by the air supply duct 5 and the exhaust duct 8. Can be done.

Further, by adopting liquefied petroleum gas as a fuel, since the liquefied petroleum gas contains almost no sulfur content, it is possible to make the ship 1 suitable for measures against sulfur oxides (SOx).

Further, by controlling the rotation speed of the exhaust fan 24 based on the concentration of the combustible gas measured by the gas detector 27, the exhaust capacity can be improved when the LPG leaks.

[Second Embodiment]
Hereinafter, the ship according to the second embodiment of the present invention will be described in detail with reference to the drawings. In this embodiment, the differences from the first embodiment described above will be mainly described, and the description thereof will be omitted for the same parts.
The ship of the present embodiment has a discharge duct for discharging the gas accumulated in the scaffold 20 provided in the main engine 4.

As shown in FIG. 2, the scaffold 20 of the present embodiment is formed with a plurality of through holes 22 penetrating in the vertical direction. A plurality of through holes 22 are arranged along the extending direction (mainly the stern direction) of the scaffold 20. The through hole 22 is arranged on the main engine 4 side of the scaffold 20.

A seal air ejection device 26 that ejects seal air so as to push the gas on the scaffold 20 back to the main engine 4 side is fixed to the handrail 21 of the scaffold 20 of the present embodiment. That is, the seal air ejection port of the seal air ejection device 26 is directed so as to push the gas on the upper surface of the scaffold 20 back to the main engine 4 side.
The compressed air source of the seal air ejection device 26 of the present embodiment is an air compressor, but it may be configured to supply compressed air from an air tank installed in the engine room 3.
The seal air ejection device 26 does not need to be fixed to the handrail 21 of the scaffold 20, and may be fixed to the main engine 4 via a support member such as a bracket, or may be fixed to the hull side.

The exhaust introduction port 9 of the exhaust duct 8B of the present embodiment opens toward the scaffold 20 below the through hole 22 of the scaffold 20. The exhaust introduction port 9 of the present embodiment is arranged at a position where the upper surface of the scaffold 20 becomes a negative pressure due to the suction force of the exhaust fan 24. The exhaust introduction port 9 of the exhaust duct 8B may penetrate the through hole 22 of the scaffold 20 and protrude above the scaffold 20.

Next, the operation of the exhaust duct 8B of the ship of the present embodiment will be described.
When the gas vaporized by LPG leaks from the main engine 4 or the turbocharger 14, the gas collects on the upper surface of the scaffold 20. The gas accumulated on the upper surface of the scaffold 20 is pushed back to the main engine 4 side by the seal air ejected by the seal air ejection device 26. This keeps the gas on the scaffold 20.
The upper surface of the scaffold 20 is negatively pressured by the exhaust fan 24 of the exhaust duct 8B. As a result, the gas retained on the scaffold 20 is introduced into the exhaust duct 8B through the through hole 22 formed in the scaffold 20 and the exhaust introduction port 9. The gas introduced into the exhaust duct 8B is discharged to the outside of the hull 2 through the exhaust discharge port 10.

According to the above embodiment, the gas containing the vaporized fuel accumulated in the scaffold 20 can be discharged to the outside of the hull 2 through the through hole 22.
Further, by providing the seal air ejection device 26 that ejects the seal air so as to push the gas on the scaffold 20 back to the main engine 4 side, the gas accumulated in the scaffold 20 is retained on the scaffold 20 and the gas diffuses into the ship. It can be suppressed.

[Third Embodiment]
Hereinafter, the ship according to the third embodiment of the present invention will be described in detail with reference to the drawings. In this embodiment, the differences from the first embodiment described above will be mainly described.
As shown in FIG. 3, the ship 1C of the present embodiment is driven by the energy of the hull 2 having the engine chamber 3 inside, the main engine 4 provided in the engine chamber 3, and the exhaust gas of the main engine 4. It includes a supercharger 14, a fuel supply device 30 that supplies fuel to the main engine 4, and an air supply / exhaust duct 50 that supplies combustion air to the engine chamber 3.

The air supply / exhaust duct 50 functions as a system for ventilating the engine room 3, and is a duct that normally supplies combustion air to the engine room 3 and discharges gas in the engine room 3 in an emergency.

The fuel supply device 30 is a device for supplying fuel to the main engine 4, from a main tank 31 in which liquefied petroleum gas is stored, for example, a service tank 32 having a capacity of about one day, and a service tank 32. A booster 33 that boosts the amount of liquefied petroleum gas to be introduced, a fuel valve train 34 (Fuel Valve Train: FVT) that supplies / shuts off fuel to the main engine 4, and a fuel supply pipe 35 that introduces fuel into the main engine 4. And have.

The service tank 32, the booster 33, and the FVT 34 are housed in the gas appliance chamber 36. The gas appliance chamber 36 is provided with an exhaust duct 37 for discharging gas in the gas appliance chamber 36 and an introduction port 40 for introducing outside air into the gas appliance chamber 36. The exhaust duct 37 has an exhaust fan 38 provided in the exhaust duct 37. The exhaust fan 38 discharges the gas in the gas appliance chamber 36 to the outside of the hull 2.

A gas detector 39 is arranged near the floor of the gas appliance room 36. The gas appliance room 36 is provided with a display device (not shown) that displays information when the concentration of combustible gas detected by the gas detector 39 exceeds a predetermined value. When the concentration of the combustible gas becomes a predetermined value or more based on the information of the display device, the operator can operate the exhaust fan 38 to discharge the combustible gas through the exhaust duct 37.

In FIG. 3, the main tank 31, the gas appliance chamber 36, and the like are drawn on the outside of the hull 2, but these components are stored inside the hull 2.
A louver 42 is provided on the side surface of the bridge portion 13 of the present embodiment. The louver 42 functions as a discharge port for discharging gas in the engine room 3.

The fuel supply pipe 35 is formed by a double pipe. That is, the fuel supply pipe 35 has an inner pipe into which fuel is introduced and an outer pipe provided on the outer peripheral side of the inner pipe. The space between the inner pipe and the outer pipe is maintained at a negative pressure by the exhaust fan 43. A gas detector 45 is provided together with an exhaust fan 43 in the pipe 44 that guides the gas between the inner pipe and the outer pipe to the outside of the hull 2. That is, the fuel supply device 30 of the present embodiment has a function of detecting the leakage of gas fuel from the inner pipe of the fuel supply pipe 35.

The air supply / exhaust duct 50 has an air supply / exhaust duct main body 51 extending in the vertical direction, and a plurality of air supply / exhaust duct extension portions 52 branching laterally from the air supply / exhaust duct main body 51. The air supply / exhaust duct main body 51 and the air supply / exhaust duct extension portion 52 are circular tubular or rectangular tubular members.

The upper end of the air supply / exhaust duct main body 51 is an air supply / exhaust port 53 that introduces air outside the hull 2 and discharges gas inside the hull 2. That is, the air supply / exhaust duct 50 communicates with the outside of the hull 2. The main body 12 of the air supply / exhaust duct 50 extends in the vertical direction so as to avoid the main engine 4.

The air supply / exhaust duct main body 51 opens toward the floor 18 of the lowest floor 19B in the engine room 3 and has an exhaust introduction port 54 for taking in the gas in the engine room 3.
The exhaust introduction port 54 is open at the bottom of the lowest floor 19B. Here, the lower part of the lowest floor 19B is a range from the upper surface of the floor 18 to H / 3, where H is the height of the lowest floor 19B.

The exhaust introduction port 54 is provided with a switchgear 55 that opens and closes the exhaust introduction port 54. The switchgear 55 is formed by a so-called butterfly type damper composed of a rotation shaft and an opening / closing member that rotates about the rotation shaft.

The air supply / exhaust duct extension 52 is branched from the air supply / exhaust duct main body 51 and extends along the ceiling of each floor 19.

The air supply / exhaust duct 50 has a plurality of air supply / exhaust ports 57 that open in the engine room 3. The air supply / discharge port 57 is arranged at the upper part of each floor 19 so as to blow the outside air of the hull 2 downward.
Further, the air supply / discharge port 57B for the main engine 4 is arranged so as to blow the air outside the hull 2 toward the main engine 4.

The air supply / exhaust duct 50 has a reversible fan 59 provided in the air supply / exhaust duct 50. The reversible fan 59 is a device having a motor and an impeller rotated by the motor, and supplying energy to the gas in the air supply / exhaust duct 50.
The impeller of the reversible fan 59 has a shape having reversibility, and the air outside the hull 2 is introduced into the engine room 3 by rotating in one direction, and the air outside the hull 2 is introduced by rotating in the other direction to the outside of the hull 2. The air in the engine room 3 is discharged. That is, in the air supply / exhaust duct 50 of the present embodiment, the exhaust duct for discharging the air in the engine room 3 to the outside of the hull 2 and the air supply duct for introducing the air outside the hull 2 into the engine room 3 are integrated. It is formed in.

A gas detector 60 is arranged near the floor of the lowest floor 19B and around the base of the main engine 4. The gas detector 60 is a sensor that detects whether or not the flammable gas of LPG is contained around the base of the main engine 4.
When the concentration of the flammable gas detected by the gas detector 60 becomes a predetermined value or more, the information can be displayed on the display device of the gas appliance room 36, for example. Based on the information on the display device, the operator operates the exhaust fan 38 so that the air in the engine room 3 is discharged to the outside of the hull 2 when the concentration of the flammable gas exceeds a predetermined value. The flammable gas can be discharged through the air supply / exhaust duct 50.
Although FIG. 3 shows only a pair of air supply / exhaust ducts 50, a plurality of air supply / exhaust ducts 50 are arranged in the stern direction.

Next, an operation method of the air supply / exhaust duct 50 of the ship 1 of the present embodiment will be described.
During normal operation, the impeller of the reversible fan 59 rotates in the direction of introducing the air outside the hull 2 into the engine room 3. Further, the opening / closing device 55 provided in the exhaust introduction port 54 of the air supply / exhaust duct 50 is in a closed state.
As a result, the air outside the hull 2 is introduced into the engine room 3 through the air supply / exhaust duct 50, and the air inside the engine room 3 is naturally discharged through the louver 42.

When the combustible gas, which is the gas vaporized by LPG, leaks from the main engine 4 or the turbocharger 14, the combustible gas collects on the upper surface of the floor 18 of the lowest floor 19B.
The gas detector 60 detects the leakage of the flammable gas by accumulating the flammable gas on the upper surface of the floor 18 of the lowest floor 19B. The information that it has been detected is displayed on the display device. The operator opens the opening / closing device 55 based on the information of the display device, and rotates the impeller of the reversible fan 59 to the outside of the hull 2 in the direction of discharging the air in the engine room 3 to the air supply / exhaust duct. Combustible gas is discharged through 50.

According to the above embodiment, even when a fuel having a specific gravity larger than that of air when vaporized, such as LPG, is used as the fuel of the main engine 4, the vaporized fuel accumulated on the upper surface of the floor 18 of the lowest floor 19B is used. The contained gas can be discharged to the outside of the hull 2.

Further, it is possible to manufacture a system for ventilating the engine room 3 at a lower cost by using a reversible fan 59 as the fan provided in the air supply / exhaust duct 50 and supplying and exhausting air through the air supply / exhaust duct 50. can.

Although the embodiment of the present invention has been described in detail with reference to the drawings, the specific configuration is not limited to this embodiment, and includes design changes and the like within a range that does not deviate from the gist of the present invention. ..

According to the present invention, even when a fuel having a specific density higher than that of air when vaporized is used as the fuel of the main engine, the gas containing the vaporized fuel accumulated on the upper surface of the floor can be discharged to the outside of the hull. can.

1,1C Ship 2 Ship 2a Inner surface 3 Engine room 4 Main engine 5 Air supply duct 6 Air supply inlet 7 Air supply / exhaust port 8 Exhaust duct 8a Exhaust duct 1st part 8b Exhaust duct 2nd part 8c Exhaust duct 3rd part 9 Exhaust introduction port 10 Exhaust exhaust port 11 Main engine air supply duct 12 Main body 12a Deck 13 Overpass 14 Supercharger 15 Main shaft accommodation 16 Cylinder 17 Ship bottom 18 Floor 19th floor 20 Scaffold 21 Handrail 22 Through hole 23 Air supply fan 24 Exhaust fan 26 Seal air ejection device 27 Gas detector 28 Control device 30 Fuel supply device 31 Main tank 32 Service tank 33 Booster 34 Fuel valve train 35 Fuel supply pipe 36 Gas equipment room 37 Exhaust duct 38 Exhaust fan 39 Gas detector 40 Introduced Port 42 Louver 43 Exhaust fan 44 Piping 45 Gas detector 50 Air supply / exhaust duct 51 Air supply / exhaust duct body 52 Air supply / exhaust duct extension 53 Air supply / exhaust port 54 Exhaust introduction port 55 Opening / closing device 57 Air supply / exhaust port 59 Reversible fan 60 Gas detection vessel

Claims (6)

A hull with an engine room inside and
A main engine installed in the engine chamber and driven by fuel having a higher specific density than air when vaporized.
A floor provided in the engine room and dividing the engine room into a plurality of floors,
An exhaust duct having an exhaust inlet opening toward the floor and an exhaust exhaust port opening outside the hull.
An exhaust fan provided in the exhaust duct and sucking through the exhaust introduction port so that the upper surface of the floor has a negative pressure.
An air supply duct having an air supply discharge port opened in the engine chamber and an air supply introduction port opened outside the hull.
An air supply fan provided in the air supply duct and introducing air outside the hull into the engine room via the air supply introduction port is provided.
The exhaust duct and the air supply duct are integrally formed as an air supply / exhaust duct.
The air supply / exhaust duct has an air supply / exhaust duct main body extending in the vertical direction and an air supply / exhaust duct extension portion extending laterally from the air supply / exhaust duct main body and extending along the ceiling.
The air supply / exhaust duct body is
The exhaust inlet that opens at the bottom of the lowest floor of the plurality of floors of the engine room is provided.
A ship provided with an opening / closing device for opening / closing the exhaust introduction port at the exhaust introduction port that opens at the lower part of the lowest floor. The floor is a scaffold that is fixed to the main engine and has through holes.
The ship according to claim 1, wherein the exhaust introduction port is open below the through hole of the scaffold. The ship according to claim 2, further comprising a seal air ejection device that ejects seal air so as to push the gas on the scaffold back to the main engine side. It is arranged at the exhaust / discharge port of the air supply / exhaust duct, and by rotating it in one direction, air outside the hull is introduced into the engine chamber, and by rotating it in the other direction, the air inside the engine chamber is outside the hull. The ship according to any one of claims 1 to 3, which has a reversible fan having an impeller from which air is discharged. A turbocharger driven by the energy of the exhaust gas of the main engine,
The ship according to any one of claims 1 to 4, further comprising a main engine air supply duct that communicates the supercharger with the outside of the hull. The ship according to any one of claims 1 to 5, wherein the fuel is liquefied petroleum gas.

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