JP7332675B2 - gas fueled ship - Google Patents

Description

The present invention relates to gas fueled ships. More particularly, the present invention relates to a gas fuel ship using liquefied gas as fuel for the propulsion engine of the ship and having a fuel gas tank in the hull.

A ship that uses liquefied fuel gas such as LNG, LPG, and AMMONIA as fuel for its propulsion system has a fuel gas tank that stores the liquefied fuel gas in its hull. This fuel gas tank is provided with a gas vent pipe for releasing high-pressure gas into the atmosphere when the pressure inside the tank rises above a specified value due to temperature rise or the like. A pressure relief valve is interposed in the middle of this gas vent pipe, and an exhaust port is provided at the tip thereof for discharging the gas phase gas to the atmosphere.

A conventional gas vent pipe is installed vertically on the exposed deck of a ship, and this gas vent pipe and a fuel gas tank are connected by a gas discharge piping line.
However, since the gas vent pipe that releases the gas is installed vertically on the exposed deck, the direction of the gas released in an emergency is vertically upward. For this reason, there is a problem that the gaseous gas discharged upwards at the time of release reaches the living quarters due to the flow of the wind, causing a health hazard to the crew members.

On the other hand, there is a conventional technique described in Patent Document 1. In this prior art, the gas vent pipe is connected to a fuel gas tank that stores liquefied gas fuel, extends upward, and protrudes upward from a vent pipe installation portion formed on the exposed deck. The vent pipe installation part is recessed more than the surrounding exposed deck. An exhaust port is provided at the upper end of the gas vent pipe, and the exhaust port discharges the vapor phase gas in the fuel gas tank to the atmosphere. This outlet is located below the highest point of the superstructure or fittings.

However, in this prior art, although the air draft restriction can be avoided by partially lowering the exposed deck by providing a partial recess, the recess reduces the cargo loading space and reduces the cargo loading capacity. It has the drawback of being reduced.
Also, as shown in FIG. 5(B), when the gas vent pipe 114 is installed in the recessed portion 120, the height h of the gas vent outlet is set according to the rules (NK Steel Ship Regulations, GF, Chapter 6, 6.7.2-7 ( Even if the height specified in 3)) (the width of the ship is B/3 or more) is maintained, the distance D in the height direction from the exposed deck 115 to the gas vent outlet becomes small. Therefore, there is a danger that the crew member p walking on the deck will easily come into contact with the discharged gaseous gas b.

JP 2018-90023 A

SUMMARY OF THE INVENTION In view of the above circumstances, it is an object of the present invention to provide a gas-fueled ship capable of ensuring the safety of the crew even if the gas phase gas in the fuel gas tank is released without narrowing the cargo loading space of the ship.

A gas fueled ship of the first invention is a gas fueled ship having a living space provided on an exposed deck and a fuel gas tank provided on the hull, wherein the gas discharge pipe is connected to the fuel gas tank and arranged on the hull. and a gas vent pipe connected to the gas discharge piping line and standing on the exposed deck, the gas vent pipe having an outlet at its tip, and the gas vent pipe The discharge port is directed outward in the width direction of the ship so as to move away from the accommodation space on the exposed deck and is inclined upward .
A gas fueled ship of a second invention is characterized in that, in the first invention, the gas vent pipe comprises a vertical pipe rising vertically from the exposed deck and an inclination sloping outward in the ship width direction and upward from the tip of the vertical pipe. and a tube.
A gas fueled ship according to a third aspect of the invention is characterized in that, in the first aspect of the invention, the gas vent pipe is an inclined pipe extending outward in the ship's width direction from above the exposed deck and inclined upward .

According to the first aspect of the invention, the gas vent pipe is slanted outward and upward, so that the gas-phase gas discharged from the outlet is discharged in a direction away from the residential area where people are likely to be present at all times . Therefore, the safety of the crew can be ensured by reducing the risk of gas flowing to the living quarters and touching the crew on the exposed deck.
According to the second aspect of the invention, it is possible to secure a sufficient separation distance from the accommodation space by means of the inclined part, and the vertical part makes it easy to secure a height position on the exposed deck.
According to the third invention, by lengthening the inclined portion, a large separation distance from the living space can be secured, so that the safety of the crew can be enhanced.

BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing of the fuel gas tank 10 and the gas vent pipe 20 in the gas fuel ship which concerns on 1st Embodiment of this invention. It is an enlarged view of gas vent pipe 20 in a gas fuel ship concerning a 1st embodiment. It is an enlarged view of the gas vent pipe 20 in the gas fuel ship which concerns on 2nd Embodiment. BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic explanatory drawing in the gas fuel ship which concerns on this invention, Comprising: (A) is a side surface, (B) is a top view. (A) is an explanatory diagram of the effect of the present invention, and (B) is an explanatory diagram of a problem in the prior art of Patent Document 1. FIG.

Next, embodiments of the present invention will be described with reference to the drawings.
The gas-fueled ship of the present invention uses liquefied natural gas as a propulsion engine, and can be applied to any type of ship, regardless of whether it is a cargo ship or a passenger ship, as long as it has a gas fuel tank inside the hull.
The following embodiment demonstrates the example applied to a car carrier.

FIG. 4 shows a gas-fueled ship S, which is an application example of the present invention. A view taken along line II in FIG. 1 is shown in FIG.
The illustrated gas-fueled ship S is applied to a car carrier, and 1 is a bow, 2 is a stern, 3 is a ship bottom, 4 is an exposed deck, and 5 is an engine room.

The interior of the hull is divided into upper and lower parts by a deck 6, and an upper vehicle loading hold 6 is provided in the upper part, and a lower vehicle loading hold 7 and a fuel gas tank installation section 8 are provided in the lower part. The configuration of the upper vehicle loading bay 6 and the lower vehicle loading bay 7 is arbitrary, and an arbitrary configuration combining various loading decks is possible.
The fuel gas tank installation section 8 may be provided inside the hull or may be provided in an exposed portion. A accommodation space 9 is provided on the exposed deck 4 and on the bow side. Living quarters are the living quarters of the ship's crew. A bridge for maneuvering a ship is often provided in the same structure as the accommodation area 9 .
In the illustrated example, the accommodation space 9 is provided on the bow side, but there are some that are provided on the stern side, and the present invention is applicable to any type of ship.

A fuel gas tank 10 is installed in the fuel gas tank installation section 8 . In the illustrated example, there are two tanks, but the present invention also includes one tank and three or more tanks.
The two fuel gas tanks 10 are connected to a gas discharge piping line 11 and arranged inside the hull. The gas discharge piping line 11 is connected to each fuel gas tank 10 at its lower end, and the connecting port at its upper end reaches the exposure deck 4 . In the illustrated example, the gas discharge piping line 11 is configured by connecting the horizontal piping 12 and the vertical piping 13, but the piping is not limited to this and can take any piping configuration.
When the fuel gas tank is arranged in the exposed area, the gas discharge piping line is mainly arranged on the exposed deck 4, and in that case, the piping configuration and piping route are also arbitrary.

The piping route of the gas discharge piping line 11 in the hull is appropriately selected depending on the hull equipment, and the position of the connection port at the upper end is not particularly limited as long as it can be connected to the gas vent pipe 20 on the exposed deck 4. Therefore, the connection port may be located at the center of the hull, on the side of the ship, or between the center and the side of the ship. Furthermore, the position of the connection port in the vertical direction may be directly below or directly above the exposed deck 4 .

A gas vent pipe 20 of a gas fueled ship S according to the first embodiment will be described with reference to FIGS. 1 and 2. FIG.
The illustrated gas vent pipe 20 is connected to a connection port at the tip of the vertical pipe 13 of the gas discharge pipe line 11 and erected on the exposed deck 4 .
The gas vent pipe 20 consists of a vertical pipe 21 rising vertically from the exposed deck 4 and an inclined pipe 22 sloping upward from the tip of the vertical pipe 21 outward in the ship width direction.
The height of the vertical pipe 21 of the gas vent pipe 20 is not particularly limited as long as it is determined so as to meet the requirements of regulations (regulations on steel ships, etc.).
The length of the slanted tube 22 should be selected to be as far away from the accommodation space 9 as possible. Further, the inclination angle θ of the inclined pipe 22 with respect to the vertical line is not particularly limited as long as it is determined so as to match the height of the vent outlet under regulations.

A pressure relief valve (not shown) is interposed in the middle of the gas vent pipe 20, and a discharge port 23 is provided at the upper end. When the pressure in the fuel gas tank 10 exceeds a specified value, the pressure relief valve opens and the vapor phase gas in the tank blows out from the discharge port 23 as indicated by symbol b.

According to the gas vent pipe 20 according to the first embodiment, the inclined pipe 22 can secure a sufficiently large separation distance from the accommodation space 9, and the vertical pipe 21 makes it easy to secure the height position above the exposed deck 4. becomes. Therefore, the outlet 23 of the gas vent pipe 20 can be provided at a position away from the residential area 9 where people are always present. Therefore, it is possible to reduce the risk that the gas phase gas b released from the outlet 23 will flow to the residential area 9 .

A gas vent pipe 20 according to the second embodiment will be described with reference to FIG.
The gas vent pipe 20 of the present embodiment is composed of an inclined pipe 22 extending upward from the exposed deck 4 toward the outside in the ship width direction. A discharge port 23 is attached to the tip of the inclined tube 22 .
In the gas vent pipe 20 according to the present embodiment, the length of the inclined pipe 22 increases the separation distance from the accommodation space 9 , so that the gas phase gas b can be discharged in a direction far away from the accommodation space 9 . Therefore, as with the gas vent pipe 20 of the first embodiment, it is possible to enhance the safety of the crew when the gas phase gas is released.

The following effects are obtained by using the gas vent pipe 20 according to the first or second embodiment.
(1) When performing a gas diffusion analysis, it becomes easier to ensure safety during the analysis work, so detailed analysis results can be obtained. By evaluating this detailed analysis result, there is a possibility that the height of the gas vent pipe 20 can be lowered. Therefore, the degree of freedom in designing the gas vent pipe 20 is improved, and the safety can be further improved.
In addition, since the present invention does not use a concave portion unlike the prior art disclosed in Patent Document 1, the cargo loading section does not become small.

(2) As shown in FIG. 5(A), since the gas vent pipe 20 of the present invention rises from the exposed deck 4, if the height h of the gas vent outlet is set according to the rules, the crew walking on the exposed deck 4 The distance D between the crew member and the discharged vapor phase gas b can be made large, and the possibility of the crew member coming into contact with the vapor phase gas b as in the prior art shown in FIG. Therefore, it is safe for the crew member p.

The present invention is not limited to the car carrier shown in the embodiment, as long as it is a gas fuel ship that uses liquefied gas as fuel for the ship's propulsion engine and has a fuel gas tank in the hull, but is not limited to a bulk carrier, an oil tanker, a chemical tanker, It can be used for various types of ships such as container ships, RORO ships, general cargo ships, refrigerated ships, and ferries.

1 bow 2 stern 4 exposure deck 8 fuel gas tank installation section 9 accommodation space 10 fuel gas tank 11 gas discharge piping line 20 gas vent pipe 21 vertical pipe 22 inclined pipe

Claims (3)

In a gas-fueled ship having accommodations on the weather deck and fuel gas tanks in the hull,
A gas discharge pipe line connected to the fuel gas tank and arranged on the hull, and a gas vent pipe connected to the gas discharge pipe line and erected on the exposed deck,
The gas vent pipe has an outlet at its tip,
The gas fuel ship , wherein the gas vent pipe is directed outward in the width direction of the ship and inclined upward so that the outlet is away from the accommodation space on the weather deck. 2. The gas vent pipe according to claim 1, wherein the gas vent pipe consists of a vertical pipe rising vertically from the exposed deck and an inclined pipe sloping outward in the ship width direction from the tip of the vertical pipe and upward. gas fueled ship. 2. A gas fuel ship according to claim 1, wherein said gas vent pipe comprises an inclined pipe extending outward in the ship's width direction and inclined upward from above said exposed deck.