JP6565022B2 - Traffic route formation structure of liquefied gas fuel ship - Google Patents

Description

  The present invention relates to a ship that can use liquefied gas as fuel, and in particular, forms a traffic route between a fuel gas hazardous area such as a refueling station or a fuel adjustment chamber and an area provided outside the fuel gas dangerous area. It is related to the structure.

  In recent years, ships that can use liquefied gas fuel such as LNG have been proposed (Patent Document 1). In such a ship, a fuel replenishment station for replenishing the liquefied gas fuel to the liquefied gas fuel tank is provided, and the properties of the liquefied gas fuel are adjusted in order to efficiently burn the liquefied gas fuel in the main engine or generator A fuel adjustment chamber is provided with equipment to perform. The refueling station and the fuel adjustment chamber are fuel gas hazardous areas where fuel gas evaporated from the liquefied gas fuel may be filled.

  In a car carrier, in a vehicle loading area and a roll-on / roll-off area, it is necessary to ventilate the vehicle by operating a ventilation device in order to prevent a fire caused by in-vehicle fuel. On the other hand, when liquefied gas fuel is used on an automobile carrier, workers can pass between the vehicle loading area and the fuel gas hazardous area as a measure to secure the traffic route between the vehicle loading area and the fuel gas dangerous area. It is possible to prevent the fuel gas from diffusing into the vehicle loading area, etc. by providing a stable air lock space and maintaining the pressure in the air lock space higher than both the vehicle loading area and the fuel gas hazardous area. is there. As another measure, it is possible to provide a traffic route such as a stairway leading to the exposed deck that is naturally ventilated from the dangerous area of the fuel gas so that it can move to the vehicle loading area through the exposed deck.

Special table 2011-503463 gazette

  In the configuration in which the air lock space is provided, if the high pressure state in the air lock space cannot be maintained, the fuel gas may flow into the vehicle loading area through the air lock space. If the fuel gas flowing into the vehicle loading area or the like stays in a region where an electrical device such as a ventilation device is provided, the region becomes an explosive atmosphere, and the electrical device such as the ventilation device may become an ignition source. Further, in the case of a configuration in which a traffic route leading from the fuel gas hazardous area to the exposed deck is provided, there is a problem that the vehicle loading area is reduced by this traffic route.

  The present invention is a liquefied gas that can prevent a fuel gas from diffusing from a fuel gas hazardous area such as a refueling station to an area outside the fuel gas dangerous area, and can minimize a reduction in a vehicle loading area. It aims at providing the traffic route formation structure of a fuel ship, and the ship which has this traffic route formation structure.

  The traffic route forming structure of the liquefied gas fuel ship according to the present invention contains a gas generation source in which fuel gas evaporated from the liquefied gas fuel may leak into the atmosphere, and is provided below the exposed deck. A chamber, an air lock space provided adjacent to the gas generation chamber, a small compartment provided adjacent to the air lock space, an outer region formed outside the gas generation chamber, the air lock space and the small compartment, A first gas-tight door capable of sealing the first entrance for moving between the gas generation chamber and the air lock space and a second entrance for moving between the air lock space and the small compartment can be sealed. A second gas-tight door, a third gas-tight door capable of sealing the third entrance for moving between the small compartment and the outer region, and ventilation means for ventilating the inside of the small compartment It is characterized by.

  The ventilation means may be a first opening formed in the small compartment for directing outside air to the small compartment. In this case, it is preferable that the distance between the gas generation source and the first opening is 4.5 m or more.

  The ventilation means may be a ventilation device for pressurizing the inside of the small compartment more than in the air lock space. In this case, it is preferable that the air supply port and the exhaust port of the ventilation device provided in the small section are formed in the wall portion on the outer region side.

  The gas generation source is, for example, a bunker manifold connected to a fuel tank that stores liquefied gas fuel, and the gas generation chamber is a fuel supply station. The gas generation source is, for example, a device that adjusts the properties of the liquefied gas fuel in order to efficiently burn the liquefied gas fuel in the main engine or the generator, and the gas generation chamber is a fuel adjustment chamber. In this case, the fuel adjustment chamber may be provided on the freeboard deck, or may be provided below the freeboard deck, and a step may be provided between the airlock space and the fuel adjustment chamber.

  The outer region is, for example, a vehicle loading area or a roll-on / roll-off area. The outer region is, for example, an engine room.

  Moreover, the ship which concerns on this invention was equipped with the traffic route formation structure which has one of the structures mentioned above.

  According to the present invention, there is no risk of fuel gas diffusing from a fuel gas hazardous area to a vehicle loading area and the like, and a traffic route forming structure for a liquefied gas fuel ship that can minimize a decrease in the vehicle loading area and the like, And the ship which has this traffic route formation structure can be obtained.

It is a top view which shows the traffic route formation structure of 1st Embodiment of this invention. It is a top view which shows the traffic route formation structure of 2nd Embodiment. It is a side view which shows the traffic route formation structure of 3rd Embodiment. It is a top view which shows the traffic route formation structure of 3rd Embodiment. It is a side view which shows the traffic route formation structure of 4th Embodiment. It is a top view which shows the traffic route formation structure of 4th Embodiment. It is a top view which shows the traffic route formation structure of 5th Embodiment. It is a top view which shows the traffic route formation structure of 6th Embodiment. It is a side view which shows the traffic route formation structure of 7th Embodiment. It is a top view which shows the traffic route formation structure of 7th Embodiment.

Hereinafter, the present invention will be described based on illustrated embodiments.
FIG. 1 shows a traffic route forming structure according to a first embodiment of the present invention. This traffic route forming structure is provided in a car carrier that can use liquefied gas as fuel, and is used as a route for workers to travel between a vehicle loading area (or roll-on / roll-off area) 10 and a fuel supply station 11. Is done. The vehicle loading area 10 and the refueling station 11 are provided on the freeboard deck located below the exposed deck. The refueling station 11 is provided on the ship side in the dry deck, and the side wall of the refueling station 11 is the outer plate 30 of the hull.

  The vehicle loading area 10 is constantly ventilated by a ventilation device (not shown) in order to prevent a fire caused by in-vehicle fuel. The fuel supply station 11 accommodates a bunker manifold 12 connected to a fuel tank that stores liquefied gas fuel. The valve 25 of the bunker manifold 12 is a gas generation source in which the fuel gas evaporated from the liquefied gas fuel may leak into the atmosphere, and the fuel supply station 11 has a gas generation chamber (fuel gas) in which the gas generation source is accommodated. Hazardous area). An airlock space 13 and a small section 16 are provided between the refueling station 11 and the vehicle loading area 10 as described below.

  The air lock space 13 is provided on the ship side adjacent to the fuel supply station 11, and the side wall of the air lock space 13 is an outer plate 30 of the hull. The refueling station 11 and the air lock space 13 are airtightly partitioned by a partition wall 14, and the partition wall 14 is formed with a first entrance 15 through which an operator can pass. The first entrance / exit 15 can be sealed by the first gas-tight door 21. The small section 16 is provided on the ship side adjacent to the airlock space 13, and the side wall of the small section 16 is also the hull outer plate 30. The airlock space 13 and the small section 16 are airtightly partitioned by a partition wall 17, and the partition wall 17 is formed with a second entrance 18 through which an operator can pass. The second entrance / exit 18 can be sealed by a second gas-tight door 22.

  In the small section 16, a partition wall 19 is formed on the side opposite to the partition wall 17, and the partition wall 19 is provided with a third doorway 20 for moving between the vehicle loading area 10. The third entrance / exit 20 can be sealed by a third gas-tight door 23. The vehicle loading area 10 is an outer area formed outside the refueling station 11, the airlock space 13, and the small section 16. In order for the worker to go from the vehicle loading area 10 to the refueling station 11, It is necessary to pass through the airlock space 13. That is, it is necessary to open and close the first, second and third gas-tight doors 21, 22, and 23. As described below, in this embodiment, the fuel gas staying in the fuel supply station 11 is loaded on the vehicle. It is configured not to flow into the area 10.

  The air lock space 13 is pressurized by a ventilation device (not shown) and is controlled to maintain a higher pressure than the fuel gas supply station 11 and the small section 16. On the other hand, a first opening 31 is formed on the side wall of the small section 16, and a second opening 32 is formed on the side wall of the fuel supply station 11. Both the first and second openings 31 and 32 are always open, and the small section 16 and the refueling station 11 are naturally ventilated and maintained at atmospheric pressure. Therefore, even if fuel gas is generated at the refueling station 11, the fuel gas is discharged from the second opening 32 to the outside of the ship and can flow into the airlock space 13 even when the first gas-tight door 21 is opened. Is prevented. Even if the fuel gas flows into the airlock space 13, when the second gas-tight door 22 is opened, the fuel gas is released from the small compartment 16 through the first opening 31 to the outside of the ship and loaded on the vehicle. There is no entry into zone 10.

The floor of the airlock space 13 is rectangular, and its area is, for example, 1.5 m ² or more. Further, the interval A between the partition walls 14 and 17 is 1.5 m to 2.5 m so that the worker who enters the air lock space 13 cannot open the first and second gas-tight doors 21 and 22 at the same time. Yes. An operator is obliged to close the second gas-tight door 22 and then open the first gas-tight door 21 when entering the refueling station 11 from the small section 16, for example, thereby the air lock space 13. It is prevented that the internal pressure suddenly decreases and approaches the pressure of the refueling station 11 and the small section 16, and the fuel gas staying in the refueling station 11 flows into the small section 16 through the air lock space 13. Is suppressed as much as possible.

In order to prevent the fuel gas released from the second opening 32 of the refueling station 11 from flowing out of the ship into the small compartment 16, the first opening 31 provided in the small compartment 16 is provided from the bunker manifold 12 as much as possible. Considered to leave. Specifically, the distance B between the edge 33 on the air lock space 13 side of the first opening 31 and the valve 25 of the bunker manifold 12 located on the air lock space 13 side in the fuel supply station 11 is 4.5 m or more. It is stipulated in. The floor of the small section 16 is a rectangle having the same width as the airlock space 13, and the area thereof is, for example, 0.8 m ² or more.

  As described above, according to the present embodiment, the pressure in the air lock space 13 is always maintained at a higher pressure than the refueling station 11 and the small section 16, so that the fuel gas from the refueling station 11 enters the small section 16. Inflow is prevented. Further, since the fuel supply station 11 is always opened to the atmosphere through the second opening 32 and naturally ventilated, the generated fuel gas is discharged from the second opening 32 to the atmosphere. On the other hand, even if the fuel gas flows into the airlock space 13 through the first entrance 15, the small compartment 16 is always open to the atmosphere through the first opening 31 and naturally ventilated. When the gas-tight door 22 is opened, the fuel gas is released from the first opening 31 to the atmosphere and does not flow into the vehicle loading area 10.

  Usually, the first to third gas-tight doors 21, 22, and 23 are closed. For example, when the worker goes from the vehicle loading area 10 to the refueling station 11, after opening the third gas-tight door 23 and entering the small section 16, the operator closes the third gas-tight door 23 and then the second gas-tight door 23. The gas-tight door 22 is opened and the air lock space 13 is entered. Then, after closing the second gas-tight door 22, the first gas-tight door 21 is opened and the fuel supply station 11 is entered. By passing in this way, even if the fuel gas stays in the fuel supply station 11, the fuel gas does not diffuse into the vehicle loading area 10, and the safety of the vehicle loading area 10 is always ensured.

In the case where a stairway leading from the refueling station 11 to the exposed deck is provided as in the prior art and the vehicle moves to the vehicle loading area 10 through this staircase, there is a problem that the area of the vehicle loading area 10 is reduced by the amount of the staircase. However, in this embodiment, compared with the prior art having an airlock space, the decrease in the vehicle loading area 10 is the area of the small section 16 (for example, 0.8 m ² ), and the decrease in the vehicle loading area 10 is minimized. Can be suppressed.

  FIG. 2 shows a second embodiment. The difference from the first embodiment is that a ventilation device 40 is provided to ventilate the small compartment 16. That is, in the first embodiment, the inside of the small section 16 is ventilated by natural ventilation through the first opening 31, but in the second embodiment, no opening is formed in the outer plate 30 that is the side wall of the small section 16, and ventilation is performed. The device 40 is ventilating. The ventilation device 40 is an exposure deck and is provided in a section 44 different from the vehicle loading area 10. The air supply port 41 and the exhaust port 42 of the ventilating device 40 are provided in the wall 43 of the small compartment 16 on the vehicle loading area 10 side, and the inside of the small compartment 16 becomes higher than the air lock space 13 by mechanical ventilation of the ventilating device 40. Pressurized to become. The airlock space 13 and the small section 16 do not need to contact the outer plate 30 and may be provided on the inner side of the outer plate 30.

  According to the second embodiment, since the pressure in the small section 16 is always maintained to be higher than the airlock space 13, the fuel gas is reliably prevented from flowing into the small section 16, and the vehicle is loaded. The safety of the area 10 is always ensured.

  A third embodiment will be described with reference to FIGS. In this embodiment, the fuel adjustment chamber 50 is a gas generation chamber (fuel gas hazardous area), and the fuel adjustment chamber 50 adjusts the properties of the liquefied gas in order to efficiently burn the liquefied gas in the main engine or the generator. Equipment is housed. Similar to the first embodiment, the fuel adjustment chamber 50, the airlock space 13, and the small section 16 are provided on the freeboard deck 52 located on the lower side of the exposed deck 51, but open to the side wall of the fuel adjustment chamber 50. Is not formed.

  The other configuration is the same as that of the first embodiment, and the portions corresponding to each other are denoted by the same reference numerals as those in FIG.

  According to the third embodiment, the same effect as the first embodiment can be obtained.

  A fourth embodiment will be described with reference to FIGS. The difference between the fourth embodiment and the third embodiment is that, in the fourth embodiment, the fuel adjustment chamber 50 is provided below the freeboard deck 52, and a step 53 is provided between the airlock space 13 and the fuel adjustment chamber 50. It is a point provided. The staircase 53 is provided in a staircase room 54 penetrating the plinth deck 52 in the vertical direction, and the staircase room 54 is a dedicated traffic route for going from the airlock space 13 to the fuel adjustment room 50.

  The first doorway 15 is formed in the partition wall 14 between the staircase 54 and the airlock space 13 and is opened and closed by the first gas-tight door 21. On the other hand, a fourth entrance / exit 56 is formed in the partition wall 55 that partitions the fuel adjustment chamber 50 and the staircase 54, and the fourth entrance / exit 56 is opened and closed by the fourth gas-tight door 24. Other configurations are the same as those of the third embodiment.

  According to the fourth embodiment, the same effect as that of the first embodiment can be obtained.

  FIG. 7 shows a fifth embodiment. This embodiment is an example of a modification of the third embodiment, and, like the second embodiment, a ventilation device 40 is provided to ventilate the inside of the small section 16. That is, in the fifth embodiment, no opening is formed in the outer plate 30 that is the side wall of the small section 16, and ventilation is performed by the ventilation device 40. The ventilation device 40 is an exposure deck and is provided in a section 44 different from the vehicle loading area 10. The air supply port 41 and the exhaust port 42 of the ventilating device 40 are provided in the wall 43 of the small compartment 16 on the vehicle loading area 10 side, and the inside of the small compartment 16 becomes higher than the air lock space 13 by mechanical ventilation of the ventilating device 40. Pressurized to become.

  According to the fifth embodiment, as in the second embodiment, the pressure in the small section 16 is always maintained to be higher than the airlock space 13, so that the fuel gas flows into the small section 16. Is reliably prevented, and the safety of the vehicle loading area 10 is always ensured.

  FIG. 8 shows a sixth embodiment. In the sixth embodiment, the fuel adjustment chamber 50 is provided below the freeboard deck as in the fourth embodiment, but is not in contact with the outer plate 30 and is located on the inner side of the hull from the staircase 54. Yes. Moreover, the ventilation apparatus 40 which ventilates the inside of the small division 16 is provided similarly to 5th Embodiment. The same parts as those in the fourth and fifth embodiments are denoted by the same reference numerals, and the description thereof is omitted.

  According to the sixth embodiment, the same effect as in the fourth and fifth embodiments can be obtained.

  9 and 10 show a seventh embodiment. In the seventh embodiment, the traffic route forming structure is configured to prevent the fuel gas in the fuel adjustment chamber 50 from diffusing into the engine room 60. That is, the engine room 60 is an outer region formed outside the fuel adjustment chamber 50, the air lock space 13 and the small section 16, and the fuel adjustment chamber 50, the air lock space 13 and the small section 16 are the same as those in the above embodiments. Similarly, it is configured such that an operator can move between the engine room 60 and the fuel adjustment room 50.

  The engine room 60, the fuel adjustment chamber 50, the airlock space 13, and the small compartment 16 are respectively provided below the freeboard deck 52. Other configurations are the same as those of the fifth embodiment, and the same parts as those of the fifth embodiment are denoted by the same reference numerals and the description thereof is omitted.

  In the first to seventh embodiments, the automobile carrier includes an RO-RO ship. The present invention is not limited to a car carrier, but can also be applied to a passenger ship, and can be applied to a ship other than a car carrier or a passenger ship as long as the superstructure is larger than a normal ship.

10 Vehicle loading area (outer area)
12 Bunker manifold (gas generation source)
11 Refueling station (gas generation room)
13 Air Lock Space 16 Subdivision 21 First Gas Closed Door 22 Second Gas Closed Door 23 Third Gas Closed Door 31 First Opening (Ventilation Means)
40 Ventilation device (ventilation means)
50 Fuel adjustment chamber (gas generation chamber)
60 Engine room (outside area)

Claims (12)

A gas generation chamber that contains a gas generation source in which fuel gas evaporated from liquefied gas fuel may leak into the atmosphere, and is provided below the exposed deck;
An airlock space provided adjacent to the gas generating chamber;
A small section provided adjacent to the airlock space;
An outer region formed outside the gas generation chamber, the airlock space and the small section;
A first gas-tight door capable of sealing a first entrance for moving between the gas generation chamber and the airlock space;
A second gas-tight door capable of sealing a second doorway for moving between the airlock space and the small compartment;
A third gas-tight door capable of sealing a third entrance for moving between the small compartment and the outer region;
A transportation route forming structure for a liquefied gas fuel ship, comprising: ventilation means for ventilating the inside of the small compartment.   The traffic route forming structure according to claim 1, wherein the ventilation means is a first opening formed in the small section so as to guide outside air to the small section.   The traffic route forming structure according to claim 2, wherein the gas generation source and the first opening are separated by 4.5 m or more.   The traffic route forming structure according to claim 1, wherein the ventilation means is a ventilation device for pressurizing the inside of the small section more than the inside of the airlock space.   The traffic route forming structure according to claim 4, wherein an air supply port and an air exhaust port of the ventilation device provided in the small section are formed in a wall portion on the outer region side.   The traffic route forming structure according to claim 1, wherein the gas generation source is a bunker manifold connected to a fuel tank storing liquefied gas fuel, and the gas generation chamber is a fuel supply station.   The gas generation source is a device that adjusts the properties of the liquefied gas fuel in order to efficiently burn the liquefied gas fuel in the main engine or the generator, and the gas generation chamber is a fuel adjustment chamber. 2. The traffic route forming structure according to any one of 2, 4, and 5.   The traffic route forming structure according to claim 7, wherein the fuel adjustment chamber is provided on a freeboard deck.   The traffic route forming structure according to claim 7, wherein the fuel adjustment chamber is provided below the plinth deck, and a step is provided between the airlock space and the fuel adjustment chamber.   The traffic route forming structure according to claim 1, wherein the outer region is a vehicle loading area or a roll-on / roll-off area.   The traffic route forming structure according to claim 1, wherein the outer region is an engine room.   The ship provided with the traffic route formation structure of any one of Claims 1-11.

Images