JP4753834B2 - Ship and NGH supply method to ship - Google Patents

Description

  The present invention relates to a ship and a method for supplying NGH to the ship.

Conventionally, a diesel engine has been adopted as a main engine of a ship, and heavy oil is used as its fuel. However, since air pollutants such as CO ₂ , NOx, and SOx are discharged, it is necessary to suppress it. Control and capital investment (low speed operation, adoption of high efficiency engine and low exhaust gas engine, etc.) are required. In addition, if heavy fuel oil leaks to the sea due to collision or grounding, serious environmental destruction may occur. Therefore, natural gas energy is attracting attention from the consideration of the global environment (see Non-Patent Document 1).

  As natural gas energy, liquefied natural gas (LNG) is well known, but since LNG is produced and stored at an extremely low temperature of −162 ° C., it has a problem that it is very difficult to handle. Further, there is a problem that LNG is evaporated little by little due to a rise in the temperature of the tank and a large amount of boil-off gas is generated. In particular, when the ship does not move for 2 to 3 days, the pressure inside the tank becomes very high, so it is necessary to remove the boil-off gas by burning in a boiler, etc., and consuming fuel unnecessarily. As a result, the cost increases.

Therefore, recently, NGH has attracted attention as a new natural gas energy (see Non-Patent Document 1). NGH is an clathrate hydrate in which natural gas molecules (guests) mainly composed of methane, ethane, propane and the like are incorporated into a cluster of water molecules, and is about 170 under an atmospheric pressure environment of −20 ° C. Since it can contain twice as much gas, it has many advantages over LNG in terms of the entire system of manufacturing, transportation, storage, and gasification. NGH is also attracting attention as clean energy because it emits less carbon dioxide and air pollutants than heavy oil.
JP 2006-8228 A Mitsui Engineering & Shipbuilding Co., Ltd., “Natural Gas Hydrate (NGH)-Mitsui Engineering & Shipbuilding”, [online], [October 23, 2006 search], Internet <URL: http://www.mes.co.jp/mes_technology /ngh.html>

  However, although NGH is easier to handle than LNG, it is handled as a spherical solid (pellet) in a low temperature environment of -20 ° C, so NGH should be filled directly into the fuel tank installed in the ship. There is a problem that is difficult. Moreover, after a part of NGH dissolves due to a rise in outside air temperature or a deterioration in transportation conditions, it is solidified again by the cold heat held by the entire NGH, so that it adheres to the piping and supply container, causing trouble in the supply of NGH. There is a fear. Therefore, a method of supplying NGH for each container suitable for its transportation can be considered. However, if it is intended to be installed inside a hull like a normal fuel tank, how the container itself as a fuel tank is sent into the hull. It becomes a problem.

  Therefore, the object of the present invention can provide a ship that can easily load NGH as fuel for the ship, and a method for supplying NGH to the ship.

  The above object of the present invention is to provide a hull, an NGH container accommodating portion provided in the hull, a deck opening / closing portion provided on a deck of the hull, and an NGH container from the deck opening / closing portion to the NGH accommodating portion. This is achieved by a ship characterized by comprising an NGH tank transfer mechanism for feeding.

  In this invention, it is preferable that the said NGH tank transfer mechanism is a guide rail fitted with the said NGH container. The NGH container housing part preferably includes a stopper for receiving the NGH container fed along the guide rail at a predetermined position, and a fuel system connected to the NGH container at the receiving position of the NGH container. . According to this, the NGH container can be slid into an arbitrary place inside the hull, and the NGH container can be reliably installed inside the hull.

  In this invention, it is preferable that the said NGH container accommodating part is provided in the lower part of the cabin provided on the deck behind the said hull. By sending the NGH container into the dead space below the cabin, it is possible to effectively use the inboard space.

  In the present invention, a main engine driven by a fuel gas obtained by gasifying NGH in the NGH container, a power generation device that generates power using the power of the main engine, and the electric power generated by the power generation device are rotated. A motor driven by the motor and the screw driven by the motor, and the main engine, the power generation device, and the motor are provided at a position that allows a maximum loading capacity in the design of the hull. preferable.

  The above object of the present invention is also to lift the NGH container with a crane and bring it to the rear of the deck, open the deck opening / closing part and set the NGH container on the guide rail, and lower the NGH container to lower the NGH container. The NGH container is fed along the guide rail into the NGH accommodating portion, and the NGH container is connected to a fuel system in the ship, and is achieved by an NGH supply method to a ship.

  Thus, according to the present invention, it is possible to provide a ship that can easily load NGH as fuel for the ship and a method for supplying NGH to the ship.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is a schematic side view showing the overall configuration of a ship according to a preferred embodiment of the present invention.

  As shown in FIG. 1, a ship 10 includes a hull 11, a cargo space 12 provided in the center of the hull 11, a cabin 13 provided on a deck behind the hull 11, and a lower portion of the cabin 13. Gas engine power generation driven by the fuel gas obtained by gasifying NGH in the NGH container 15, and the NGH container 15 as a fuel tank accommodated in the NGH container accommodation unit 14. Machine 16, motor 17 driven by electric power from gas engine generator 16, and screw 18 rotated by motor 17.

  The gas engine generator 16 and the motor 17 constitute an electric drive propulsion mechanism of the ship 10, and the motor 17 is provided in the immediate vicinity of the screw 18, but the gas engine generator 16 is accommodated in an NGH container away from the motor 17. It is provided in the immediate vicinity of the part 14. In a conventional diesel direct drive propulsion system, it is necessary to provide a large diesel engine in the immediate vicinity of the screw 18, that is, behind the hull, and the space below the cabin is occupied by the engine room. By adopting a very small electric drive propulsion mechanism, there is an empty space at the bottom of the cabin. Further, in the electric drive propulsion mechanism, it is sufficient that only the motor 17 is provided in the immediate vicinity of the screw 18, and the gas engine generator 16 can be provided at a position away from the motor 17. Can be taken even wider. Since the gas engine generator 16 and the motor 17 may be connected by electrical wiring, wiring can be performed very easily without being restricted by the inboard structure.

  The wide empty space secured in this way is used as an NGH container accommodating portion 14 which is an accommodating space for the NGH container 15 as a fuel tank. Then, the NGH as the fuel for the ship 10 is loaded into the ship together with the container and is accommodated in the NGH container accommodating portion 14.

  FIG. 2 is a schematic top view showing the configuration of the NGH container accommodating portion 14.

  The NGH container accommodating portion 14 is a guide as a NGH container transfer mechanism that feeds the NGH container 15 from the deck opening / closing portion 21 to the NGH container accommodating portion 14 on a deck behind the cabin 13. Rail 22. The container accommodating part 14 of this embodiment can accommodate two NGH containers side by side, and the NGH container 15 is sent from the position shown by the rectangular broken line. Moreover, the NGH container accommodating part 14 of this embodiment has a structure which guides one NGH container 15 using a pair of guide rail 22. FIG.

  FIG. 3 is a schematic diagram showing the structure of the NGH container accommodating portion 14 in more detail.

  As shown in FIG. 3, the NGH container accommodating portion 14 includes a guide rail 22, a stopper 24 that receives and fixes the NGH container fed along the guide rail 22 at a predetermined position, and a stop position of the NGH container 15. And a fuel pipe 25 connected to the fuel discharge port of the NGH container 15. On the other hand, the NGH container 15 of the present embodiment includes a fitting portion (not shown) with the guide rail 22 and can move along the guide rail 22 to the container accommodation position below the cabin. . As a fitting part, the roller mechanism which can drive | work on the guide rail 22 other than mere uneven | corrugated shape may be sufficient. A horizontal portion 22 a is provided at the tip of the guide rail 22. By having this horizontal portion 22a, the NGH container 15 can be temporarily placed on the guide rail 22, and the fitting of the NGH container 15 and the guide rail 22 can be facilitated.

  The fuel discharge port of the NGH container 15 has a socket structure that is automatically connected to the fuel pipe 25 when the end surface of the NGH container 15 reaches a predetermined position where it abuts against the stopper 24. This socket structure needs to be provided at a position where there is no risk of the water obtained with NGH gasification being discharged, and the generated gas is unlikely to remain in the NGH container and can be efficiently ejected. is there. Furthermore, it is preferable that the NGH container 15 is provided with a measuring device that measures the amount of gas used. This measuring device preferably has a function of constantly measuring the flow rate of the gas flowing through the socket portion and measuring the NGH remaining amount in the container, the container internal pressure, and the tank internal temperature. With these functions, it is possible to detect a gas leak in the NGH container.

  4 and 5 are schematic views showing the accommodation procedure of the NGH container 15.

  When the NGH container 15 is loaded on the ship 10, the deck opening / closing part 21 is opened, and the NGH container 15 is lifted by the port crane 31 so that the longitudinal direction of the NGH container 15 is perpendicular to the ground. Bring it (Figure 4).

  Next, the NGH container 15 is slowly lowered and the NGH container 15 is set on the guide rail 22 (FIG. 5A). At this time, the NHG container 15 is still upright, and the NGH container 15 is temporarily placed on the horizontal portion 22 a of the guide rail 22. When the NGH container 15 is tilted by a crane operation, the NGH container 15 starts to descend along the guide rail 22 (FIG. 5B). By further lowering the NGH container 15, the NGH container 15 is further fed along the guide rail 22, and when the end surface of the NGH container 15 comes into contact with the stopper 24, the NGH container 15 is locked and the NGH container 15 is locked. The 15 socket portions are connected to the fuel pipe 25 and are completely accommodated in the NGH container accommodating portion 14 (FIG. 5C).

  When taking out the empty NGH container 15 from the NGH container accommodating part 14, after opening a deck opening-and-closing part, the port crane 31 is connected to an NGH container. Next, after unlocking the NGH container 15, the crane is slowly pulled up. In this way, the NGH container 15 is pulled up along the guide rail 22 and taken out from the NGH container accommodating portion 14.

  As described above, the ship 10 of the present embodiment employs an electric drive propulsion mechanism and arranges the gas engine generator 16 for driving the motor 17 in an empty space in the ship away from the motor 17. Since a vacant space is secured in the lower part of the cabin and the NGH container accommodating portion 14 is provided in the vacant space, the NGH container 15 can be efficiently accommodated and the inboard space can be effectively used.

  In this embodiment, since the NGH container 15 is sent along the guide rail 22 while being suspended by a crane, the NGH container 15 can be reliably sent to the lower part of the cabin, and power for feeding the NGH container 15 is separately prepared. There is no need to do. As a result, the NGH container 15 can be taken in and out safely and reliably. In addition, because of the presence of the cabin 13, it is possible to effectively use the empty space below the cabin, which is very difficult to use.

  Moreover, according to this embodiment, since the NGH container 15 becomes a fuel tank of the ship 10 as it is, the permanent fuel tank in a ship becomes unnecessary. Accordingly, maintenance of the fuel tank is not necessary, and the construction cost of the ship can be reduced. In addition, a fuel supply line (loading arm) for supplying fuel from the harbor facility to the fuel tank in the ship is not required, and the working time for replenishing fuel can be shortened and the amount of purge gas can be reduced.

  The present invention is not limited to the above embodiments, and various modifications can be made without departing from the spirit of the present invention, and these are also included in the scope of the present invention. Needless to say.

  For example, in the above-described embodiment, the case where the NGH container 15 is handled to the end using the harbor crane 31 has been described. Instead, a method may be used in which the NGH container 15 is suspended to a predetermined position below the cabin using a ship-side crane or winch.

  Moreover, in the said embodiment, although the case where it sends into the container accommodating part 14 with the dead weight of the NGH container 15 along the guide rail 22 was demonstrated, the bucket attached to the guide rail 22 is prepared, and the NGH container 15 is set to the said bucket. Then, the crane is disconnected from the NGH container 15, and the bucket on the guide rail 22 is moved like a cable car by using the motor in the ship so that the NGH container 15 is fed into the container accommodating portion 14. Good.

  Moreover, in the said embodiment, although the case where the NGH container 15 was slid in the cabin lower part of a hull rear part was demonstrated, this invention is not limited to such a case, a hull front end part, a hull side part, a hull The container accommodating portion 14 may be provided in any place as long as it is inside the hull such as the center bottom. According to the present invention, it is possible to send the NGH container to any place inside the hull.

FIG. 1 is a schematic side view showing the overall configuration of a ship according to a preferred embodiment of the present invention. FIG. 2 is a schematic top view showing the configuration of the NGH container accommodating portion 14. FIG. 3 is a schematic diagram showing the structure of the NGH container accommodating portion 14 in more detail. FIG. 4 is a schematic diagram showing the accommodation procedure of the NGH container 15. FIG. 5 is a schematic diagram showing the accommodation procedure of the NGH container 15.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Ship 11 Hull 12 Cargo space 13 Cabin 14 NGH container accommodating part 15 NGH container 16 Gas engine generator 17 Motor 18 Screw 21 Deck opening / closing part 22 Guide rail 22a Horizontal part 24 of guide rail front-end | tip part 24 Stopper 25 Fuel piping 31 Harbor crane

Claims (6)

The hull,
An NGH container filled with NGH as navigation fuel;
An NGH container housing provided in the hull;
A deck opening / closing section provided on the deck of the hull and provided at a position shifted from the NGH container housing section in plan view ;
An NGH tank transfer mechanism for feeding an NGH container from the deck opening / closing section to the NGH container housing section ;
The ship characterized in that the NGH tank transfer mechanism is a guide rail that includes a downwardly inclined portion extending from the deck opening / closing part to the NGH container accommodating part, and is fitted with the NGH container . The ship according to claim 1, wherein a horizontal portion is provided at a tip portion of the guide rail on the deck opening / closing portion side. The NGH container accommodating unit further comprises a stopper for receiving the NGH containers fed along the guide rail at a predetermined position, and a fuel pipe connected to NGH container at receiving positions of the NGH container, the NGH container , the stopper and the vessel according to claim 1 or 2, characterized in further comprising Rukoto fuel outlet socket structure that is automatically connected with the fuel pipe when it reaches to a predetermined position in contact.   The ship according to any one of claims 1 to 3, wherein the NGH container accommodating portion is provided in a lower portion of a cabin provided on a deck behind the hull.   A power generation device driven by fuel gas obtained by gasifying NGH in the NGH container, a motor driven by electric power from the power generation device, and a screw driven by the motor. The ship according to any one of claims 1 to 4. Lifting an NGH container filled with NGH as navigation fuel with a crane and bringing it to the rear of the hull deck;
Open the deck opening portion provided on the deck, extending the NGH container until NGH container accommodating part provided in a position shifted in the deck opening portion in plan view a hull interior from the deck off portion Setting on a guide rail having a downward slope ;
Wherein with feeding the NGH container along the guide rail by taking down NGH container to the NGH container accommodating portion, to ships, characterized in that it comprises the step of connecting the NGH container ship fuel system NGH Supply method.

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