JPH08230784A - Installation method of gaseous fuel tube - Google Patents

Abstract

PURPOSE: To improve the fixing strength by miniaturizing the fitting of a gas duct, reducing the weight, and reducing the cost. CONSTITUTION: A duct body 8 of U-shaped section is arranged from the outside of the engine compartment of a ship 1 into an engine room 4. The duct body 8 is fixed to the lower side of an upper deck 7 to form a gas duct 9. The gas duct 9 is led and connected to a boiler valve hood 10 of a boiler 5, and a gaseous fuel tube 6 is led to this gas duct. Because the gas duct 9 is led to the outside of the engine compartment, the air or the leaked gas in the gas duct 9 can be discharged and ventilated to the outside of the engine compartment. The upper deck 7 is commonly used as one side of the gas duct 9, and the gas duct 9 is compact, and the fixing strength is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is directed to a gas fuel pipe for feeding a vaporized gas (BOG) of liquefied natural gas (LNG), which is a cargo, to an engine room in an LNG ship for the purpose of using it as fuel for a marine engine. It is about the method.

[0002]

2. Description of the Related Art FIG. 4 shows an outline of an LNG carrier. A plurality of holds 2 are formed inside a ship 1, and a cargo tank 3 made of, for example, an aluminum alloy is installed in each hold 2. The gas fuel pipe 6 is guided from the cargo tank 3 to the boiler 5 arranged in the engine room 4, and a part of the LNG loaded in the cargo tank 3 is vaporized (hereinafter referred to as "gas"). , BOG) is sent to the boiler 5 through a gas fuel pipe 6 and burned in the boiler 5 to be used as fuel for a marine engine.

In such an LNG ship, one of the rules for using LNG BOG as a fuel for a marine engine is:
Regarding the introduction of the gas fuel pipe 6, there is a classification rule that it must be installed in a pipe or duct that is cut off from the engine room 4 and ventilated with exhaust air. Therefore, as a conventional gas fuel pipe guiding method, for the purpose of guiding the gas fuel pipe 6 from the cargo tank 3 to the inside of the engine room 4, it is made of a steel plate which is previously ventilated outside the engine compartment of the ship. The gas duct is separately installed from outside the engine compartment to inside the engine room 4, and then the gas fuel pipe 6 is guided from the outside of the engine compartment to the inside of the engine room 4 by the gas duct.

[0004]

However, in the case of the conventional method for introducing a gas fuel pipe described above, a gas duct made of steel plate is independently installed from outside the engine compartment of the ship 1 to inside the engine room 4. Therefore, in order to install a single gas duct, there is a problem that the equipment space inside and outside the engine room 4 is required to be large and the weight of the equipment is increased, so that the cost for the equipment is increased. Since it is unavoidable that vibration occurs in a single gas duct due to vibration caused by driving of the engine or wobbling of the hull, there is also a problem that reliability of the duct deteriorates due to metal fatigue or the like caused by the vibration.

Therefore, the present invention intends to provide a gas fuel pipe guiding method capable of reducing the size, weight and cost of the fittings attached to the installation of the gas duct and suppressing the vibration generated in the gas duct. To do.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a hull of a duct main body having an open surface at least in part, from the outside of the engine compartment of a ship to the inside of the engine room along a required route. Arranged along the structure, and then fixing the open side of the duct body to the hull structure so that the open surface of the duct body is closed to form a gas duct with the duct body and the hull structure; , The end portion of the gas duct on the engine room side is led to and connected to a boiler valve hood provided around the boiler installed in the engine room, and then a gas fuel pipe for sending BOG to the boiler is connected to the gas duct. Through the outside of the engine room to the above-mentioned boiler valve hood.

Further, an exhaust duct equipped with an exhaust fan may be connected to a required position of the gas duct to allow exhaust ventilation in the gas duct and the boiler valve hood to the outside of the engine compartment.

[0008]

A boiler valve hood provided inside the engine compartment from outside the engine compartment by forming a gas duct by the duct body and the hull structure by closing the open body by fixing the duct body having the open surface to the hull structure. If the gas fuel pipe is installed from the outside of the engine compartment to the boiler valve hood through the gas duct, the required surface of the gas duct can be shared by the hull structure. It can be arranged compactly and the fixing strength of the gas duct can be enhanced.

Further, when the inside of the gas duct and the inside of the boiler valve hood are ventilated to the outside of the engine compartment through an exhaust duct equipped with an exhaust fan, the air in the gas duct, leaked gas, etc. are more likely to flow to the outside of the engine compartment. Can be actively released.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 show an embodiment of a gas duct guiding method according to the present invention. As a hull structure of the ship 1, for example, a U-shaped cross section is provided under the upper deck 7 in advance. The duct main body 8 having a shape is arranged from the outside of the engine compartment of the ship 1 to the inside of the engine room 4 along a required route, and the duct main body 8 is fixed to the lower side of the upper deck 7 so that the opening surface faces upward. Then, a gas duct 9 is formed by the lower side surface of the upper deck 7 and the duct body 8, and the gas duct 9 is provided at the terminal end inside the engine room 4 and around a set of boilers 5 installed in the engine room 4. Each of the two generated boiler valve hoods 10 is connected by a single duct 11, so that the gas duct 9, the single duct 11, and the boiler valve hood 10 are connected.
A series of passages consisting of the above are arranged so that exhaust air is ventilated out of the engine compartment of the ship 1, and then the gas fuel pipe 6 guided from a cargo tank (not shown) is passed through the gas duct 9 and the individual duct 11 to the boiler valve. Hood 10
Try to lead to. Further, an exhaust duct 14 provided with an exhaust fan 13 driven by a motor 12 is branched from a required position outside the engine compartment of the gas duct 9 so that a tip portion of the exhaust duct 14 is moved from a required position of the upper deck 7 to the ship 1 It should be led out of the engine compartment such as the outside of. Further, the gas fuel pipe 6 is installed up to the boiler valve hood 10.
Is extended to the boiler 5 and BOG generated in the cargo tank is sent to the boiler 5 in the engine room 4 through the gas fuel pipe 6 and burned in the boiler 5 to be used as fuel for a marine engine. To

In the figure, 15 is the main engine of the ship 1, and 16 is the propeller shaft.

In the present invention, as a duct for guiding the gas fuel pipe 6 from the outside of the engine compartment of the ship 1 to the boiler valve hood 10 in the engine room 4, the lower surface of the upper deck 7 and a U-shaped cross section. The gas duct 9 and the single duct 11 configured by the duct main body 8 having the above-mentioned structure are connected by guiding them from outside the engine compartment to the boiler valve hood 10 inside the engine room 4.
Since the gas fuel pipe 6 is guided inside these, the gas fuel pipe 6 is shut off in the engine room 4, and a series of passages consisting of the gas duct 9, the single duct 11 and the boiler valve hood 10 are provided. The air inside and the BOG and the like leaked when a gas leak occurs from the gas fuel pipe 6 installed in the gas duct 9 can be discharged to the outside of the engine compartment, and the classification rules can be satisfied. Moreover, since the upper surface of the gas duct 9 is also used as the lower side surface of the upper deck 7, the gas duct 9 is downsized as compared with the conventional method in which a gas duct made of steel plate is formed independently. At the same time, a small amount of outfitting can be covered by the installation of the gas duct 9, the outfitting space can be reduced and the outfitting weight can be reduced, and the outfitting man-hours can be significantly reduced. Of the gas duct 9 against the vibration of the main engine and the vibration of the hull is improved. When the exhaust duct 14 provided with the exhaust fan 13 is branched from a required position outside the engine compartment of the gas duct 9 so that the tip of the exhaust duct 14 is led out of the engine compartment of the ship 1, the exhaust fan 13 is driven. As a result, the air in the gas duct 9 and the boiler valve hood 10 and leaked BOG and the like can be more positively discharged to the outside of the engine compartment of the ship 1 through the exhaust duct 14.

Next, FIG. 3 shows another embodiment of the present invention. In a method similar to that shown in FIGS. 1 and 2,
Depending on the conditions of the hull structure, the above boiler valve hood 1
0 indicates the case where the stern bulkhead 17 is attached to a hull structure.

In the case of the embodiment shown in FIG. 3, the extension portion 9a is dropped along the stern bulkhead 17 from the terminal end portion of the gas duct 9 formed by the lower side surface of the upper deck 7 and the duct body 8 to move the gas duct 9 to the boiler. Since the valve hood 10 is directly connected to the valve hood 10, the single duct 11 used for connecting the terminal end of the gas duct 9 and the boiler valve hood 10 in the embodiment of FIGS. it can.

In the above-mentioned embodiment, the case where the duct main body 8 is fixed to the upper deck 7 and the stern bulkhead 17 as the hull structure to form the gas duct 9 has been described. The duct main body 8 may be fixed to the shell structure to form the gas duct 9, or the duct main body 8 may be L-shaped in cross section and the gas duct 9 may be formed by utilizing the corner portion between the upper deck 7 and the stern bulkhead 17. Alternatively, the position where the exhaust duct 14 is branched from the gas duct 9 is not limited to the tip portion of the gas duct 9, but may be determined depending on the arrangement route of the gas duct 9 in order to effectively perform exhaust ventilation in the duct. It is needless to say that various changes can be made without departing from the scope of the present invention, such as appropriate change by the above.

[0017]

As described above, according to the method for introducing a gas fuel pipe of the present invention, a gas duct extending from the outside of the engine compartment to the inside of the engine is formed in advance by the hull structure and the duct body. An exhaust duct equipped with an exhaust fan is branched from a required position of the gas duct, and a boiler valve hood is connected to the end portion of the gas duct so that the gas duct and the boiler valve hood are exhausted to the outside of the engine compartment by the exhaust duct. Next, since the gas fuel pipe is introduced from the outside of the engine compartment to the boiler valve hood through the gas duct, the open surface of the gas duct can also serve as the hull structure, and the gas duct can be compactly arranged. As a result, downsizing and weight reduction of outfitting can be achieved, and the number of outfitting steps can be significantly reduced. Strokes can be reduced, and the strength of fixing the gas duct is enhanced to increase the vibration damping force, which can significantly improve the reliability of the gas duct. Furthermore, the gas duct and the boiler valve hood It has an excellent effect that air, leaked gas, etc. can be more positively discharged to the outside of the engine compartment.

[Brief description of drawings]

FIG. 1 is a schematic view showing an embodiment of a gas fuel pipe guiding method of the present invention.

FIG. 2 is a view on arrow AA of FIG.

FIG. 3 is a schematic view showing another embodiment of the present invention.

FIG. 4 is a schematic diagram showing an example of an LNG ship.

[Explanation of symbols]

 1 Ship 4 Engine Room 5 Boiler 6 Gas Fuel Pipe 7 Upper Deck (Hull Structure) 8 Duct Body 9 Gas Duct 9a Extension 10 Boiler Valve Hood 13 Exhaust Fan 14 Exhaust Duct 17 Stern Bulkhead (Hull Structure)

Claims (2)

[Claims] 1. A duct body having an open surface in at least a part thereof is arranged along the hull structure from outside the engine compartment of a ship to the engine room along a required route, and then, the open side of the duct body is placed. By fixing to the hull structure and closing the open surface of the duct body, a gas duct is formed by the duct body and the hull structure, and then the end of the gas duct on the engine room side was installed in the engine room. It is characterized in that a gas fuel pipe for sending BOG to the boiler is guided from the outside of the engine room to the boiler valve hood through the gas duct, after being connected to a boiler valve hood provided around the boiler. A method of installing a gas fuel pipe. 2. The gas fuel pipe guiding apparatus according to claim 1, wherein an exhaust duct equipped with an exhaust fan is connected to a required position of the gas duct to allow exhaust ventilation in the gas duct and the boiler valve hood to the outside of the engine compartment. Method.