JPWO2018186050A1 - Ship - Google Patents

Abstract

A hull (2) having an engine room (3) inside, a main engine (4) provided in the engine room (3) and driven by fuel having a larger specific gravity than air when vaporized, and the engine room Exhaust having a floor (18) provided in (3), an exhaust inlet (9) opening toward the floor (18), and an exhaust outlet (10) opening outside the hull (2). A duct (8) and an exhaust fan (24) provided in the exhaust duct (8) for sucking the upper surface of the floor (18) through the exhaust inlet (9) so as to have a negative pressure. Provide a ship (1).

Description

The present invention relates to a ship.
The present application claims priority to Japanese Patent Application No. 2017-076903 filed in Japan on April 7, 2017, the contents of which are incorporated herein by reference.

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

JP, 2014-184941, A

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

  However, fuels containing almost no sulfur such as liquefied petroleum gas (LPG, Liquidated Petroleum Gas) have a greater specific gravity than air when vaporized, and therefore, in the unlikely event that the pipes supplied to the engine room leak, There is a concern that it will not be discharged from the engine and will remain in the engine room.

  An object of the present invention is to provide a ship that can easily ventilate when leaking even when a fuel having a larger specific gravity than air is used when vaporized.

  According to the first aspect of the present invention, a ship has a hull having an engine room inside, a main engine provided in the engine room and driven by a fuel having a larger specific gravity than air when vaporized, An exhaust duct having a floor provided in the engine room, an exhaust inlet opening toward the floor, and an exhaust outlet opening outside the hull; and an exhaust duct provided in the exhaust duct, An exhaust fan that sucks the upper surface of the floor so as to have a negative pressure through the exhaust introduction port.

  According to this structure, even when a fuel having a larger specific gravity than air 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.

  In the above-mentioned marine vessel, an air supply duct having an air supply outlet opening inside the engine room and an air supply inlet opening outside the hull, and an air supply duct provided in the air supply duct and provided outside the hull. An air supply fan that introduces air into the engine chamber through the air supply inlet may be provided.

  In the marine vessel, the exhaust duct and the air supply duct may be formed independently.

  According to such a configuration, it is possible to balance the supply air and the exhaust air and maintain the environment such as the temperature inside the engine room optimal.

  In the above-mentioned ship, the floor may divide the engine room into a plurality of floors, and the exhaust gas introduction port may open at a lower portion of the floor.

  According to such a configuration, the gas containing the vaporized fuel accumulated in the lower portion of the floor of each floor can be discharged to the outside of the hull.

  In the above ship, the floor may be a scaffold fixed to the main engine and having a through hole, and the exhaust gas introduction port may be opened below the through hole of the scaffold.

  According to such a configuration, the gas containing the vaporized fuel accumulated on the scaffold can be discharged to the outside of the hull via the through hole.

  The above-mentioned marine vessel may be provided with a seal air jetting device for jetting seal air so as to push the gas on the scaffolding back to the main engine side.

  According to such a configuration, the gas accumulated in the scaffold can be retained on the scaffold and the diffusion of the gas into the ship can be suppressed.

  In the marine vessel, the exhaust duct and the air supply duct may be integrally formed as an air supply / exhaust duct.

  In the ship, the air is provided outside the hull by being arranged at the exhaust outlet of the air supply / exhaust duct, and rotating in one direction to introduce air outside the hull into the engine room, and rotating in the other direction to the outside of the hull. A reversible fan having an impeller for discharging the air in the engine room may be included.

  With such a configuration, a system for ventilating the engine room can be manufactured at low cost.

  The above-mentioned ship may include a supercharger driven by the energy of the exhaust gas of the main engine, and a main engine air supply duct that connects the supercharger and the outside of the hull.

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

In the above ship, the fuel may be liquefied petroleum gas.
According to such a configuration, the liquefied petroleum gas contains almost no sulfur, so that the ship can be made suitable for measures against sulfur oxides (SOx).

  According to the present invention, even when a fuel having a larger specific gravity than air 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. it can.

FIG. 3 is a cross-sectional view of the ship according to the first embodiment of the present invention as seen from the bow-stern direction. FIG. 8 is an enlarged cross-sectional view of the ship according to the second embodiment of the present invention as viewed from the bow-stern direction. It is sectional drawing seen from the bow-stern direction of the ship of 3rd embodiment of this invention.

[First embodiment]
Hereinafter, a ship according to a first embodiment of the present invention will be described in detail with reference to the drawings.
As shown in FIG. 1, a ship 1 of the present embodiment is driven by a hull 2 having an engine room 3 inside, a main engine 4 provided in the engine room 3, and energy of exhaust gas of the main engine 4. A supercharger 14, an air supply duct 5 that supplies combustion air to the engine room 3, an exhaust duct 8 that discharges gas in the engine room 3, and a control device 28 are provided. 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 plane of FIG. 1 is the bow-stern direction of the ship 1. The lateral 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 body portion 12 in the width direction W.

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

  The marine vessel 1 has a main engine air supply duct 11 for introducing air outside the hull 2 into a supercharger 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 and butane as a main component. That is, the main engine 4 is driven by the LPG.
LPG is vaporized in an atmosphere of normal temperature and atmospheric pressure. LPG has a larger specific gravity 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, but may be methanol, ethanol, dimethyl ether, or the like.

  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 hull 2 in the width direction W. The main surface of the floor 18 is orthogonal to the vertical direction.

  The main engine 4 is also 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 vertical center of the main engine 4 extending in the bow-stern direction. The scaffold 20 extends in the bow-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 inlet 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 vertically 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 floor 18 of the lowermost layer.

The air supply duct 5 has a plurality of air supply / discharge ports 7 that open in the engine room 3. The air supply / exhaust port 7 is arranged at the upper part of each floor 19 so as to blow the air outside the hull 2 downward.
Further, the air supply / exhaust port 7B for the main engine 4 is arranged so as to blow 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 that is rotated by the motor, and is a device that applies energy to the gas in the air supply duct 5. The air outside the hull 2 is introduced into the engine room 3 by the air supply fan 23.

  The exhaust duct 8 is a circular tubular member or a rectangular tubular member extending along the inner surface of the hull 2. The upper end of the exhaust duct 8 is an exhaust outlet 10 that opens outside the hull 2 and discharges gas. That is, the exhaust duct 8 communicates with the outside of the hull 2. The exhaust duct 8 is open 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 inside the exhaust duct 8. The exhaust fan 24 is a device that has a motor and an impeller, and applies energy to the gas in the exhaust duct 8. The exhaust fan 24 is explosion-proof, and constituent parts 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 electrostatic charge. The gas in the engine room 3 is discharged to the outside of the hull 2 by the exhaust fan 24.
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 downstream 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 a combustible gas of LPG.
The gas detector 27 is electrically connected to the controller 28, and the controller 28 refers to the concentration of the 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 performs control to increase the rotation speed of the exhaust fan 24 when the concentration of the combustible gas detected by the gas detector 27 becomes equal to or higher than a predetermined value.

The exhaust duct 8 has an exhaust duct first portion 8a arranged in the bridge portion 13, and an exhaust duct second portion 8b and an exhaust duct third portion 8c arranged in the main body portion 12. 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 portion 8a extends vertically in 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 exhaust duct third portion 8c extends along the inner surface 2a of the side surface of the main body portion 12.

The exhaust gas introduction port 9 opens at the bottom 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 gas inlet 9 opens toward the center of the boat 1 in the width direction W. That is, the exhaust introduction port 9 has a shape that easily takes in gas flowing from the center of the ship 1 in the width direction W toward the outside in the width direction W.
Although only a pair of air supply ducts 5 and exhaust ducts 8 are shown in FIG. 2, a plurality of air supply ducts 5 and exhaust ducts 8 are arranged in the bow-stern direction.

Here, paying attention to the uppermost floor 19A on one side of the ship 1, the air supply / exhaust port 7 and the exhaust gas inlet 9 corresponding to this floor 19A are configured to cooperate to ventilate air. ..
Specifically, air is discharged toward the outside in the width direction W of the hull 2 from the air supply / discharge port 7A arranged near the center of the hull 2 in the width direction W. The gas containing the air discharged from the supply air discharge port 7A is taken in from the exhaust gas 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 the air is discharged from the supply air discharge port 7A. This enables efficient ventilation.

Next, the operation of the air supply duct 5 and the exhaust duct 8 of the ship 1 of this embodiment will be described.
When the gas vaporized by the LPG leaks from the main engine 4 or the supercharger 14, the gas accumulates on the upper surface of the floor 18 because the LPG is a fuel having a larger specific gravity than air when vaporized. In other words, the vaporized LPG remains in the ship without being discharged upward.
The upper surface of the floor 18 is kept at a negative pressure by the exhaust fan 24 of the exhaust duct 8. As a result, the gas accumulated on the upper surface of the floor 18 is introduced into the exhaust duct 8 via the exhaust introduction port 9. The gas introduced into the exhaust duct 8 is exhausted to the outside of the hull 2 through the exhaust outlet 10.

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

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

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

  Further, by providing the main engine air supply duct 11 for the supercharger 14 independently of the air supply duct 5, it is easy to balance the air supply and the exhaust air by the air supply duct 5 and the exhaust duct 8. You can

  Further, by adopting the liquefied petroleum gas as the fuel, the liquefied petroleum gas contains almost no sulfur content, so that the ship 1 suitable for sulfur oxide (SOx) countermeasures can be obtained.

  Further, by controlling the number of revolutions of the exhaust fan 24 based on the concentration of the combustible gas measured by the gas detector 27, it is possible to improve the exhaust capacity when the LPG leaks.

[Second embodiment]
Hereinafter, a ship according to a second embodiment of the present invention will be described in detail with reference to the drawings. In the present embodiment, differences from the above-described first embodiment will be mainly described, and description of similar parts will be omitted.
The ship of the present embodiment has an exhaust duct that exhausts the gas accumulated in the scaffolding 20 provided in the main engine 4.

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

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

  The exhaust gas introduction port 9 of the exhaust duct 8B of the present embodiment is opened below the through hole 22 of the scaffold 20 toward the scaffold 20. The exhaust introduction port 9 of the present embodiment is arranged at a position such that the upper surface of the scaffold 20 has a negative pressure due to the suction force of the exhaust fan 24. The exhaust gas inlet 9 of the exhaust duct 8 </ b> B 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 this embodiment will be described.
When the gas vaporized by the LPG leaks from the main engine 4 or the supercharger 14, the gas accumulates 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 jetted by the seal air jetting device 26. This causes the gas to remain on the scaffold 20.
The upper surface of the scaffold 20 has a negative pressure 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 exhausted to the outside of the hull 2 through the exhaust outlet 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 ejecting 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 is prevented from diffusing into the ship. Can be suppressed.

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

  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 that supplies fuel to the main engine 4, and includes a main tank 31 in which liquefied petroleum gas is stored, a service tank 32 having a capacity of about one day, and a service tank 32. A booster device 33 for boosting the introduced liquefied petroleum gas, a fuel valve train 34 (FVT) for supplying / shutting off fuel to the main engine 4, and a fuel supply pipe 35 for introducing fuel to the main engine 4. And have.

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

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

Note that, in FIG. 3, the main tank 31, the gas equipment chamber 36, and the like are drawn outside the hull 2, but these constituent elements 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 an exhaust port that exhausts the 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 kept at a negative pressure by the exhaust fan 43. A gas detector 45 is provided together with an exhaust fan 43 in a 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 leakage of gas fuel from the inner pipe of the fuel supply pipe 35.

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

  An 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 air supply / exhaust duct 50 extends vertically so as to avoid the main engine 4 in the main body 12.

The air supply / exhaust duct main body 51 has an exhaust inlet 54 that opens toward the floor 18 of the lowest floor 19 </ b> B in the engine room 3 and takes in gas in the engine room 3.
The exhaust gas inlet 54 opens at the bottom of the lowest floor 19B. Here, the lower part of the lowermost floor 19B is a range from the upper surface of the floor 18 to H / 3, where H is the height of the lowermost floor 19B.

  The exhaust introduction port 54 is provided with an opening / closing device 55 that opens and closes the exhaust introduction port 54. The opening / closing device 55 is formed by a so-called butterfly-type damper including a rotating shaft and an opening / closing member that rotates around the rotating 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 / exhaust port 57 is arranged at the upper part of each floor 19 so as to blow the air outside the hull 2 downward.
Further, the air supply / exhaust 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 duct 50. The reversible fan 59 is a device that has an electric motor and an impeller that is rotated by the electric motor, and applies energy to the gas in the air supply / exhaust duct 50.
The impeller of the reversible fan 59 has a reversible shape. When it is rotated in one direction, the air outside the hull 2 is introduced into the engine room 3, and when it is rotated in the other direction, it is exposed to the outside of the hull 2. The air in the engine room 3 is discharged. That is, in the air supply duct 50 of the present embodiment, an exhaust duct that discharges the air inside the engine room 3 to the outside of the hull 2 and an air supply duct that introduces 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 a flammable gas of LPG is contained around the base of the main engine 4.
When the concentration of the combustible gas detected by the gas detector 60 exceeds a predetermined value, the information can be displayed on the display device in the gas equipment room 36, for example. 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 combustible gas exceeds a predetermined value based on the information on the display device. The combustible gas can be discharged through the air supply / exhaust duct 50.
Although only a pair of air supply / exhaust ducts 50 is shown in FIG. 3, a plurality of air supply / exhaust ducts 50 are arranged in the bow-stern direction.

Next, a method of operating the air supply / exhaust duct 50 of the ship 1 of this embodiment will be described.
During normal operation, the impeller of the reversible fan 59 is rotating 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 gas introduction port 54 of the air supply / exhaust duct 50 is closed.
As a result, the air outside the hull 2 is introduced into the engine room 3 via the air supply / exhaust duct 50, and the air in the engine room 3 is naturally discharged via the louver 42.

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

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

  Further, the fan provided in the air supply / exhaust duct 50 is a reversible fan 59, and air is supplied and exhausted in the air supply / exhaust duct 50, whereby a system for ventilating the engine room 3 at a lower cost can be manufactured. it 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 without departing from the scope of the present invention. ..

  According to the present invention, even when a fuel having a larger specific gravity than air is used as the fuel for 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. it can.

1, 1C Vessel 2 Hull 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 first part 8b Exhaust duct second part 8c Exhaust duct third part 9 Exhaust gas inlet port 10 Exhaust gas outlet port 11 Main engine air supply duct 12 Main body part 12a Deck 13 Bridge part 14 Supercharger 15 Main shaft housing part 16 Cylinder part 17 Ship bottom 18 Floor 19 Floor 20 Scaffold 21 Handrail 22 Through hole 23 Air supply fan 24 Exhaust fan 26 Seal air jet device 27 Gas detector 28 Control device 30 Fuel supply device 31 Main tank 32 Service tank 33 Booster device 34 Fuel valve train 35 Fuel supply pipe 36 Gas equipment room 37 Exhaust duct 38 Exhaust fan 39 Gas detector 40 Introduction Mouth 42 Louver 43 Exhaust fan 44 Piping 45 Gas detector 50 Air Supply / Exhaust Duct 51 Air Supply / Exhaust Duct Main Body 52 Air Supply / Exhaust Duct Extension 53 Air Supply / Exhaust Port 54 Exhaust Inlet Port 55 Switchgear 57 Air Supply Exhaust Port 59 Reversible Fan 60 Gas Detector

According to the first aspect of the present invention, a ship has a hull having an engine room inside, a main engine provided in the engine room and driven by a fuel having a larger specific gravity than air when vaporized, An exhaust duct having a floor provided in the engine room, an exhaust inlet opening toward the floor, and an exhaust outlet opening outside the hull; and an exhaust duct provided in the exhaust duct for introducing the exhaust gas. An air supply fan having an exhaust fan that sucks air through the mouth so that the upper surface of the floor has a negative pressure, an air supply outlet opening inside the engine room, and an air supply inlet opening outside the hull. An air supply fan provided in the air supply duct for introducing air outside the hull into the engine room through the air supply inlet, and the exhaust duct and the air supply duct are supplied with each other. It is integrally formed as an exhaust duct, Duct has a supply and exhaust duct body extending in the vertical direction, and a supply and exhaust duct extending portion extending along the ceiling branched from fed-exhaust duct body laterally.

According to the second aspect of the present invention, a ship has a hull having an engine room inside, a main engine provided in the engine room, and driven by a fuel having a larger specific gravity than air when vaporized, An exhaust duct having a floor provided in the engine room, an exhaust inlet opening toward the floor, and an exhaust outlet opening outside the hull; and an exhaust duct provided in the exhaust duct for introducing the exhaust gas. An exhaust fan that sucks a negative pressure on the upper surface of the floor via a mouth, the floor is a scaffold fixed to the main engine and having a through hole, and the exhaust inlet is the scaffold. Is opened below the through hole.
According to this structure, even when a fuel having a larger specific gravity than air 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. Further, the gas containing the vaporized fuel accumulated on the scaffold can be discharged to the outside of the hull via the through hole.

In a second aspect of the present invention, the vessel is provided with an air supply duct having an air supply outlet opening inside the engine room and an air supply inlet opening outside the hull, and provided in the air supply duct. And an air supply fan for introducing the air outside the hull into the engine room through the air supply inlet.

In the second aspect of the present invention, the exhaust duct and the air supply duct may be formed independently.
According to such a configuration, it is possible to balance the supply air and the exhaust air and maintain the environment such as the temperature inside the engine room optimal.

In the first and second aspects of the present invention, the floor may divide the engine room into a plurality of floors, and the exhaust gas inlet may be opened at a lower portion of the floor.

In the first and second aspects of the present invention, the marine vessel may include a seal air ejecting device that ejects seal air so as to push back the gas on the scaffold to the main engine side.

In the first and second aspects of the present invention, the vessel is arranged at the exhaust outlet of the air supply / exhaust duct, and air outside the hull is introduced into the engine room by rotating the vessel in one direction. A reversible fan having an impeller for discharging the air in the engine room may be provided outside the hull by rotating in the other direction.

1st and 2nd aspect of this invention WHEREIN: The said ship is the supercharger driven by the energy of the exhaust gas of the said main engine, and the main engine air supply duct which connects the supercharger and the exterior of the said hull. May be provided.

In the first and second aspects of the present invention, the fuel may be liquefied petroleum gas.
According to such a configuration, the liquefied petroleum gas contains almost no sulfur, so that the ship can be made suitable for measures against sulfur oxides (SOx).

Claims (10)

A hull with an engine room inside,
A main engine provided in the engine room and driven by fuel having a larger specific gravity than air when vaporized,
A floor provided in the engine room,
An exhaust duct having an exhaust inlet opening toward the floor and an exhaust outlet opening outside the hull,
An exhaust fan, which is provided in the exhaust duct, and sucks the upper surface of the floor so as to have a negative pressure through the exhaust introduction port. An air supply duct having an air supply outlet opening inside the engine room and an air supply inlet opening outside the hull,
The water supply fan according to claim 1, further comprising: an air supply fan that is provided in the air supply duct and that introduces air outside the hull into the engine room through the air supply inlet.   The ship according to claim 2, wherein the exhaust duct and the air supply duct are formed independently. The floor divides the engine room into a plurality of floors,
The said exhaust gas inlet is a ship as described in any one of Claim 1 to 3 which opens at the lower part of the said floor. The floor is a scaffold fixed to the main engine and having a through hole,
The watercraft according to any one of claims 1 to 4, wherein the exhaust gas introduction port opens below the through hole of the scaffold.   The ship according to claim 5, further comprising a seal air ejecting device that ejects seal air so as to push back the gas on the scaffold to the main engine side.   The ship according to claim 2, wherein the exhaust duct and the air supply duct are integrally formed as a supply / exhaust duct.   Arranged at the exhaust outlet of the air supply / exhaust duct, the air outside the hull is introduced into the engine room by rotating in one direction, and the air in the engine room outside the hull by rotating in the other direction. The watercraft according to claim 7, further comprising a reversible fan having an impeller for discharging air. A supercharger driven by the energy of the exhaust gas of the main engine,
The marine vessel according to any one of claims 1 to 8, further comprising: a main engine air supply duct that communicates the supercharger with the outside of the hull.   The marine vessel according to any one of claims 1 to 9, wherein the fuel is liquefied petroleum gas.

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