KR20160017770A - Structure of Exhaust for Fuel Gas Supply System of Liquefied Natural Gas - Google Patents

Abstract

A fuel supply outlet structure for a liquefied gas supply system according to a first embodiment of the present invention comprises: a manhole frame which forms a path of a liquefied gas storage tank; and an opening/closing unit which is arranged in the manhole frame, opens the path so that an outlet for discharging fuel from the liquefied gas storage tank, and closes the path at ordinary time. The opening/closing unit is formed with a thin film to be crushed by the load of the outlet as the outlet descends. The fuel supply outlet structure for a liquefied gas supply system according to the present invention is able to: prevent a safety accident by blocking liquefied gas or BOG from being leaked from the liquefied gas storage tank as the liquefied gas storage tank is closed by the opening/closing unit at ordinary time; and simultaneously prevent a safety accident caused by BOG leakage as the path is not exposed during the installation process of the outlet by opening the path in order to install the suction line of the outlet in the liquefied gas storage tank after the outlet is installed in the manhole frame in a state in which the liquefied gas storage tank is closed by the opening/closing unit and the path is sealed by the outlet when the path is opened for the repair of a boosting pump.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a fuel supply outlet for a liquefied gas supply system,

The present invention relates to a fuel supply outlet structure for a liquefied gas supply system.

Liquefied natural gas (Liquefied natural gas), Liquefied petroleum gas (Liquefied petroleum gas) and other liquefied gas are widely used in place of gasoline or diesel in recent technology development.

Liquefied natural gas is a liquefied natural gas obtained by refining natural gas collected from a gas field. It is a colorless and transparent liquid with almost no pollutants and high calorific value. It is an excellent fuel. On the other hand, liquefied petroleum gas is a liquid fuel made by compressing gas containing propane (C3H8) and butane (C4H10), which come from oil in oil field, at room temperature. Liquefied petroleum gas, like liquefied natural gas, is colorless and odorless and is widely used as fuel for household, business, industrial, and automotive use.

Such liquefied gas is stored in a liquefied gas storage tank installed on the ground or stored in a liquefied gas storage tank provided in a ship which is a means of transporting the ocean. The liquefied natural gas is liquefied to a volume of 1/600 The liquefaction of liquefied petroleum gas has the advantage of reducing the volume of propane to 1/260 and the content of butane to 1/230, resulting in high storage efficiency.

In the liquefied gas storage tank, a manhole for maintenance and inspection is generally provided, and a manhole cover for opening and closing the manhole is provided on the manhole. However, the manhole can only be opened if it has to be replaced with oxygen after the interior of the liquefied gas storage tank has been emptied for safety reasons.

If the LNG is to be discharged outside of the liquefied gas storage tank due to a failure of the latent booster pump in the liquefied gas storage tank, the access passage connecting the inside of the liquefied gas storage tank is only a manhole, If the manhole is opened in a state filled with LNG, it is dangerous due to the influence of the explosive gas generated in the liquefied gas storage tank.

In order to install the discharging device, the lid is firstly disassembled and then the discharging device is installed. In the course of installing the discharging device, the manhole is necessarily exposed and the manhole is improved. There is a need.

It is an object of the present invention to provide a liquefied gas storage tank that is capable of storing liquefied gas in the process of installing a discharge device for discharging LNG in a liquefied gas storage tank, And to provide a fuel supply outlet structure for a liquefied gas supply system capable of preventing safety accidents caused by leakage of gas as a passage of a tank is exposed.

A fuel supply outlet structure for a liquefied gas supply system according to a first embodiment of the present invention includes a manhole frame forming a passage of a liquefied gas storage tank; And an opening / closing part provided in the manhole frame for opening the passage so as to install a discharge device for discharging the fuel in the liquefied gas storage tank, and closing the passage at a normal time, wherein the opening / And a thin film which is broken by a load of the discharging device.

The manhole cover may further include a manhole cover provided at an upper portion of the opening and closing part, the manhole cover being supported at an upper end of the manhole frame to open and close the passage of the manhole frame.

A fuel supply outlet structure for a liquefied gas supply system according to a second embodiment of the present invention includes a manhole frame forming a passage of a liquefied gas storage tank; And an opening / closing part provided in the manhole frame for opening the passage so as to install a discharge device for discharging the fuel in the liquefied gas storage tank, and closing the passage at a normal time, wherein the opening / And a rotary member rotated by a load of the discharge device to open the passage.

Specifically, the rotary member is rotated in a side-face shape at a lower portion of the manhole frame to open and close the passage.

A fuel supply outlet structure for a liquefied gas supply system according to a third embodiment of the present invention includes a manhole frame forming a passage of a liquefied gas storage tank; And an opening / closing unit provided in the manhole frame to open the passage so as to install a discharge device for discharging the fuel in the liquefied gas storage tank, and to close the passage at a normal time, wherein the opening / ; And a guide member provided at a lower portion of the manhole frame to receive the sliding member.

Specifically, the sliding member includes: an opening / closing blade that moves to cross or expose the passage; And a driving member for moving the opening / closing blade.

The fuel supply outlet structure for a liquefied gas supply system according to the present invention is characterized in that the liquefied gas storage tank is closed by an opening and closing part at normal times to prevent leakage of liquefied gas or BOG from the liquefied gas storage tank, When the passage is opened for repairing the pump, the discharge device is installed on the manhole frame with the liquefied gas storage tank closed by the opening / closing part, and the passage is sealed by the discharge device. After the suction line of the discharge device is connected to the liquefied gas By opening the passage to be installed inside the storage tank, the passage is not exposed during the installation process of the discharge device, so that the safety accident caused by BOG leakage can be prevented.

1 is a view conceptually showing a liquefied gas supply system provided with a fuel supply outlet structure according to an embodiment of the present invention.
2 is a view showing a structure of the fuel supply outlet portion of the first embodiment of the present invention.
3 is a view showing a structure of the fuel supply outlet portion of the second embodiment of the present invention.
4 is a plan view showing the opening and closing part of the fuel supply outlet structure according to the second embodiment of the present invention.
5 is a view showing a structure of the fuel supply outlet portion in the third embodiment of the present invention.
6 is a plan view showing a state in which the opening and closing part of the fuel supply outlet structure of the third embodiment of the present invention closes the passage.
7 is a plan view showing a state in which the opening and closing part of the fuel supply outlet structure of the third embodiment of the present invention opens the passage.
8 is a view showing a structure of the fuel supply outlet portion of the fourth embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The objects, particular advantages and novel features of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG. It should be noted that, in the present specification, the reference numerals are added to the constituent elements of the drawings, and the same constituent elements have the same numerical numbers as much as possible even if they are displayed on different drawings. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

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

1 is a view conceptually showing a liquefied gas supply system provided with a fuel supply outlet structure according to an embodiment of the present invention. FIGS. 2 to 8 are views for explaining the structure of the fuel supply outlet portion according to the embodiments of the present invention.

1 to 8, a fuel supply outlet structure 200, 300, 400, 400A according to the present invention is provided in a liquefied gas supply system 100, 300, 400, 400A) including a liquefied gas storage tank (110), an engine (120), a high pressure pump (130), a heat exchanger (140), a booster pump (150) Is carried out in the liquefied gas storage tank (110).

The liquefied gas storage tank 110 stores liquefied gas to be supplied to the engine 120 (hereinafter, LNG will be exemplified), and may be provided in the liquefied gas supply system 100. The liquefied gas storage tank 110 must store the LNG in a liquid state, wherein the liquefied gas storage tank 110 may have the form of a pressure tank. In the present specification, LNG can be used to encompass both NG, which is a liquid state, and NG, which is a supercritical state, for the sake of convenience.

The liquefied gas storage tank 110 includes an outer tank 111, an inner tank 112 and a heat insulating portion 113. The liquefied gas storage tank 110 includes a liquefied gas storage tank 110, A fuel supply outlet structure 200, 300, 400, 400A to be described later is formed on the upper portion of the storage tank 110. The outer tank 111 is formed as an outer wall of the liquefied gas storage tank 110, and may be formed of a steel material, and may have various shapes such as a circular shape or a polygonal shape in cross section.

The inner tank 112 is provided inside the outer tank 111 and can be supported inside the outer tank 111 by a support (not shown). At this time, the support may be provided at the lower end of the inner tank 112, and may also be provided at the side of the inner tank for restricting lateral movement of the inner tank.

The bath tank 112 may be made of stainless steel and designed to withstand a pressure of 1 bar to 10 bar (e.g. 6 bar). The reason why the inner tank 112 is designed to withstand such a constant pressure is that the inner pressure of the inner tank 112 can be increased as the LNG provided in the inner tank 112 is evaporated to generate the evaporation gas Because.

The heat insulating portion 113 is provided between the inner tank 112 and the outer tank 111 and can prevent the external heat energy from being transmitted to the inner tank 112. At this time, the heat insulating portion 113 may be in a vacuum state. The liquefied gas storage tank 110 of a vacuum insulated type in which the heat insulating portion 113 is in a vacuum state can not only withstand high pressure more efficiently than a general tank but also has excellent heat insulating property. For example, the liquefied gas storage tank 110 of the vacuum insulation type can not only maintain the pressure of 5 to 20 bar through the vacuum heat insulating portion 113 but also effectively suppress the generation of the evaporative gas due to the external environment .

As described above, the present embodiment uses the vacuum insulation type liquefied gas storage tank 110 provided with the heat insulating portion 113 of the vacuum type between the outer tank 111 and the inner tank 112 to minimize the generation of the evaporated gas It is possible to prevent a problem such as breakage of the liquefied gas storage tank 110 even if the internal pressure is increased.

The engine 120 is driven through the LNG supplied from the liquefied gas storage tank 110 to generate thrust. The engine 120 may be a MEGI engine or a heterogeneous fuel engine.

When the engine 120 is a heterogeneous fuel engine, LNG or oil may be selectively supplied, and LNG and oil may be mixed and not supplied. This is to prevent the mixture of two materials having different combustion temperatures from being mixed, thereby preventing the efficiency of the engine 120 from deteriorating.

As the piston 120 (not shown) in the cylinder (not shown) reciprocates by the combustion of the LNG, the engine 120 rotates the crank shaft (not shown) connected to the piston, (Not shown) can be rotated. Therefore, as the propeller (not shown) connected to the shaft finally rotates when the engine 120 is driven, the hull (not shown) moves forward or backward.

Of course, in the present embodiment, the engine 120 may be an engine 120 for driving the propeller, but may be an engine 120 for generating electricity or an engine 120 for generating other power. That is, the present embodiment does not specifically limit the type of the engine 120. [ However, the engine 120 may be an internal combustion engine that generates a driving force by combustion of the LNG.

A fuel supply line 160 for transferring LNG may be installed between the liquefied gas storage tank 110 and the engine 120 and a high pressure pump 130 and a heat exchanger 140 may be installed in the fuel supply line 160 So that the LNG can be supplied to the engine 120.

At this time, the fuel supply line 160 is provided with a fuel supply valve 170, and the supply amount of the LNG can be adjusted according to the opening degree control of the fuel supply valve 170.

The high pressure pump 130 may be provided on the fuel supply line 160 between the heat exchanger 140 and a boosting pump 150 to be described later. The LNG discharged from the liquefied gas storage tank 110 is supplied to the high pressure And the LNG is supplied to the engine 120 through the heat exchanger 140, which will be described later. The LNG is discharged from the liquefied gas storage tank 110 at a pressure of about 10 bar and then pressurized by a boosting pump 150 to be described later. The high-pressure pump 130 is pressurized by a boosting pump 150 LNG in a liquid state is secondarily compressed and supplied to a heat exchanger 140 to be described later.

At this time, the high-pressure pump 130 may compress the LNG to a desired pressure, for example, 200 to 400 bar, and supply the LNG to the engine 120, thereby causing the engine 120 to produce thrust through the LNG .

The heat exchanger 140 heats the LNG to the combustion temperature required by the engine 120 and supplies it to the engine 120. The heat exchanger 140 may be provided on the fuel supply line 160 between the engine 120 and the high pressure pump 130 and may be connected to the LNG while maintaining a pressure of 200 bar to 400 bar discharged from the high pressure pump 130 It can be heated.

The heat exchanger 140 can use engine exhaust in a ship, waste heat of a boiler or a generator as a heat source for heating the LNG, heat exchange with LNG using specific chemical substances, To receive heat. In this case, the chemical substance may be a glycol water or the like which is supplied with heat by circulating a separate cycle by steam or the like and then supplies the supplied heat to the LNG.

The booster pump 150 may be connected to one end of the fuel supply line 160 and may be provided in the liquefied gas storage tank 110 to supply a sufficient amount of LNG to the high pressure pump 130, Thereby preventing cavitation of the substrate. Also, the boosting pump 150 can extract the LNG from the liquefied gas storage tank 110 to pressurize the LNG within a few to several tens of bar, and the LNG through the boosting pump 150 can be pressurized to 10 to 40 bar.

The boosting pump 150 is disposed at the bottom of the liquefied gas storage tank 110 so that the remaining LNG can be easily supplied to the high pressure pump 130 even when the amount of LNG stored in the liquefied gas storage tank 110 is reduced. It is desirable to install it.

The fuel supply outlet structures 200, 300, 400 and 400A are connected to the liquefied gas storage tank 110 so that the LNG stored in the liquefied gas storage tank 110 can be discharged to the upper side of the liquefied gas storage tank 110. [ And will be described below with reference to the embodiments of the present invention with reference to FIGS. 2 to 8. FIG. However, other configurations except for the fuel supply outlet structure 200, 300, 400, and 400A in the following embodiments are the same as those of the embodiment of the present invention described with reference to FIG. 1, .

Here, when the booster pump 150 fails, the discharge device is installed on the manhole frame 210 for repairing the boosting pump 150 and the like. At this time, the discharging device can seal the passage 211 of the manhole frame 210, but it is possible to prevent the passage 211 from being opened during the process of installing the discharging device after the manhole cover 220 is opened So that the liquefied gas, BOG, is prevented from leaking through the passage 211 of the manhole frame 210 by the fuel supply outlet structure 200, 300, 400, 400A described later.

2 is a view showing a structure of the fuel supply outlet portion of the first embodiment of the present invention.

Referring to FIG. 2, the fuel supply outlet structure 200 includes a manhole frame 210, a manhole cover 220, and an opening / closing portion 230.

The manhole frame 210 forms a passage 211 of the liquefied gas storage tank 110.

The manhole frame 210 may be formed in a cylindrical shape or a polygonal columnar shape having a direct downward passage 211 so that the fuel supply line 160 can pass through the inside of the liquefied gas storage tank 110 and the outside thereof, . The manhole frame 210 is connected to the outer tank 111 of the liquefied gas storage tank 110 along the upper peripheral surface and connected to the inner tank 112 of the liquefied gas storage tank 110 along the lower outer surface, So that the heat insulating portion 113 of the gas storage tank 110 is sealed.

The upper portion of the manhole frame 210 is preferably formed to extend a certain length from the outer tank 111 of the liquefied gas storage tank 110 to the outside so as to easily install the manhole cover 220 to be described later. Further, the manhole frame 210 may be formed with a manhole cover bent outward along the upper edge thereof.

It is preferable that the lower portion of the manhole frame 210 is formed to be positioned at least on the ceiling of the tank tank 112 of the liquefied gas storage tank 110 so as not to extend toward the inside of the liquefied gas storage tank 110, So as to minimize the penetration of heat from the outside of the liquefied gas storage tank 110 into the liquefied gas storage tank 110 along the passage 211 of the liquefied gas storage tank 210. That is, the closer the passage 211 of the manhole frame 210 is to the LNG stored in the liquefied gas storage tank 110, the better the heat transfer to the LNG is and the higher the probability of generating the evaporation gas.

In order to further minimize the heat penetration from the outside, a heat insulating material (not shown) may be provided along the inner circumferential surface of the manhole frame 210. Since the heat insulating material may include a general heat insulating material used in the liquefied gas storage tank 110, the kind of the specific heat insulating material is not mentioned in this embodiment.

The manhole frame 210 may be formed of a steel material such as the outer tank 111 of the liquefied gas storage tank 110 or may be formed of stainless steel such as the inner tank 112 of the liquefied gas storage tank 110 . The manhole frame 210 may be directly exposed to the inside of the liquefied gas storage tank 110 and may be formed of a stainless material such as the tank tank 112 of the liquefied gas storage tank 110.

Here, the manhole cover, which is the upper part of the manhole frame 210, may be formed to be bent outward along the upper edge of the manhole frame 210, and may be configured to fix the manhole cover 220 to be described later .

A manhole cover 220 may be provided on the upper portion of the manhole frame 210. The manhole cover 220 is formed with a hole (not shown) for inserting the fuel supply line 160 therein, And can be coupled and fixed to the upper surface of the manhole cover 210 so as to block the exit of the passage 211 of the manhole frame 210. The manhole cover 220 blocks the inside and the outside of the LNG storage tank 110 and has a manhole receiver 220 for blocking the outlet of the passage 211 of the hollow and manhole frame 210 into which the fuel supply line 160 is inserted It is needless to say that there is a means for sealing the LNG from leaking to the outside. Such a sealing means may be a general sealing means applied to the LNG storage tank 110, and a detailed description thereof will be omitted in the present embodiment.

The opening and closing part 230 is configured to open and close the passageway 211 so that the passageway 211 is provided in the manhole frame 210 so that a discharge device (not shown) for discharging the fuel in the liquefied gas storage tank 110 is installed. And closes the passageway during normal times.

Here, the discharging device is an apparatus for discharging (unloading) the LNG inside the liquefied gas storage tank 110. When the booster pump 150 inside the liquefied gas storage tank 110 fails, the liquefied gas storage tank 110, Is an apparatus for discharging the LNG in the liquefied gas storage tank 110 to prevent a safety accident so that an operator can directly enter the booming pump 150 to repair the boosting pump 150. [

The opening and closing part 230 of the present embodiment may be formed of a thin film, and the thin film may be torn by the load of the discharging device due to the descent of the discharging device. For example, the thin film may be made of an aluminum type plate, vinyl, paper, It can be torn by the suction line (a line for sucking and discharging the liquefied gas inside the liquefied gas storage tank) to open the passage 211. [

At this time, the thin film is made of one time and is torn by the discharging device. After the passage 211 is opened, the liquefied gas in the liquefied gas storage tank 110 is discharged by the discharging device, and then the repair of the boosting pump 150 is completed , The thin film can be reinstalled. Here, the thin film may be provided between the manhole frame 210 and the manhole cover 220 for ease of installation. Alternatively, it may be installed below the manhole frame 210.

As described above, in the present embodiment, the liquefied gas storage tank 110 is closed by the manhole cover 220 at a normal time, thereby preventing leakage of liquefied gas or BOG from the liquefied gas storage tank 110, When the manhole cover 220 is opened for repairing the boosting pump 150, the discharging device is moved to the manhole frame 210 in a state in which the liquefied gas storage tank 110 is temporarily closed by the thin- Even if the manhole cover 220 opens the passageway 211 by opening the passageway 211 by opening the passageway 211, the passageway is closed by the thin film so that the laminar gas and the safety by the leakage of the BOG It can prevent accidents.

FIG. 3 is a view showing a structure of a fuel supply outlet portion according to a second embodiment of the present invention, and FIG. 4 is a plan view showing an opening and closing portion of the fuel supply outlet portion structure of the second embodiment of the present invention. The same or corresponding elements as those of the first embodiment described above are denoted by the same reference numerals, and redundant description thereof will be omitted.

3 and 4, the fuel supply outlet structure 300 includes a manhole frame 210, a manhole cover 220 and an opening and closing portion 310, and the fuel supply outlet structure 300 of the present embodiment The opening and closing part 310 is differently made. That is, the opening and closing part 230 of the first embodiment is made of a thin film and is torn by the discharging device to open the passage 211, but the opening and closing part 310 of this embodiment is differently made to open the passage 211 by rotation.

Specifically, the opening / closing part 310 opens the passageway 211 so as to provide a discharge device (not shown) provided in the manhole frame 210 to discharge the fuel inside the liquefied gas storage tank 110, Closing is similar.

However, the opening and closing part 310 of the present embodiment may include the rotating members 311 and 312. [ The rotary members 311 and 312 are rotated by the load of the discharge device by the descent of the discharge device to open the passage.

For example, the rotatable members 311 and 312 may be rotated in a side-by-side manner at the lower portion of the manhole frame 210 to open and close the passageway 211. At this time, the rotary members 311 and 312 are rotatably installed at the lower portion of the manhole frame 210 by a connecting method such as a hinge or a hinge, and are kept closed at normal times by an elastic support such as a spring , The rotating members 311 and 312 are pushed to both sides by the load of the suction line when the suction line of the discharging device is lowered to open the passage 211. [ The through holes 310A may be formed in the rotary members 311 and 312 so that the fuel supply line 160 can pass through the rotary members 311 and 312 while the passage 211 is closed.

Alternatively, the motor shaft may be connected to the rotary members 311 and 312 to be opened by the motor (not shown) to open the passageway 211, but it is preferable to prevent waste of electric power, The rotating members 311 and 312 can be physically opened by the load of the suction line so as to be opened by the line.

The manhole frame 210 and the manhole cover 220 of the present embodiment are installed in the upper part of the liquefied gas storage tank 110 and are provided with a fuel supply line 160 for delivering the LNG as in the first embodiment Of course.

The manhole cover 220 may be omitted and the opening and closing part 310 may be provided in the upper and lower portions of the manhole frame 210. In this embodiment, the manhole cover 220 and the opening / closing part 310 are provided on the upper and lower portions of the manhole frame 210, (Or upper) portion of the frame 210 so as to prevent leakage of the liquefied gas and BOG by closing the passageway 211 by the opening / closing portion 310 at a normal time.

At this time, a seal member (not shown) may be provided on the surface where the rotary members 311 and 312 are in contact with each other and the circumferential surface of the through hole 310A to seal the passage 211. Preferably, however, the manhole cover 220 is provided on the manhole frame 210 to prevent external heat from being transmitted through the passageway of the manhole frame 210.

The liquefied gas storage tank 110 is closed by the opening and closing part 310 including the manhole cover 220 and the rotating members 311 and 312 so that the liquefied gas or BOG is stored in the liquefied gas storage tank When the manhole cover 220 is opened for repairing the boosting pump 150 while the leakage of the liquefied gas storage tank 110 is blocked by preventing the leakage of the liquefied gas storage tank 110 by the opening and closing part 310, Even if the manhole cover 220 opens the passageway 211 by opening the passageway 211 due to the descent of the discharge device after the discharge device is installed on the manhole frame 210, So that the safety of the BOG leakage can be prevented.

6 is a plan view showing a state in which the opening and closing part of the fuel supply outlet structure of the third embodiment of the present invention closes the passage, and Fig. 7 is a plan view showing a state in which the opening and closing part of the fuel supply outlet structure of the third embodiment of the present invention opens the passage.

8 is a view showing the structure of the fuel supply outlet portion of the fourth embodiment of the present invention.

The same or corresponding elements as those of the above-described embodiments are denoted by the same reference numerals, and redundant description thereof will be omitted.

5 to 7, the fuel supply outlet structure 400 includes a manhole frame 210, a manhole cover 220 and an opening and closing part 410, and the fuel supply outlet structure 400 ) Is different from the fuel supply outlet structure (200, 300) and the opening / closing part (410) of the above-described embodiments. In other words, the opening and closing part 230 of the first embodiment is made of a thin film, and the opening and closing part 310 of the second embodiment is of a sliding type.

Specifically, the opening and closing part 410 includes a sliding member 411 and a guide member 412.

First, the guide member 412 can support the sliding member 411 as well as form a moving path of the sliding member 411. For example, the guide member 412 may be provided in a lower portion of the manhole frame 210, and may have a box shape in which a receiving space is formed to receive the sliding member 411 and one side is opened to allow the sliding member 411 to flow in and out.

Here, a roller (not shown) may be provided between the guide member 412 and the sliding member 411 so that the guide member 412 and the sliding member 411 can be easily slid, And a description of a known technique is omitted.

The sliding member 411 slides across the passage 211 and includes an opening / closing blade 412B and a driving member 411A.

The opening / closing blade 412B can move to cross or expose the passage 211. [ The opening and closing blade 412B traverses the passage 211A where the opening and closing part 410 is located and the passage 211A can take various forms such as a circle, an ellipse, or a polygon depending on the design.

The opening / closing blades 412B crossing the passages 211A are provided in one or more (in this embodiment, a pair of), and can translate so as to abut each other. That is, the opening / closing blade 412B may be formed of a pair of blades that translationally move from one side to the other.

For example, as shown in Fig. 6, the pair of blades can be brought into contact with each other to close the passage 211A, or to open the passage 211A apart from each other, as shown in Fig.

The driving member 411A is configured to cause the opening / closing blade 412B to translationally move, and is connected to the opening / closing blade 412B composed of a pair of blades. For example, the driving member 411A includes a cylinder and a piston, and by adjusting the projecting length of the opening / closing blade 412B by extending the piston, the pair of blades are brought into contact with or spaced from each other to open / close the passage 211A .

In the present embodiment, the open / close blades 412B are provided as a pair, and the pair of blades are in contact with or spaced from each other to open / close the passage 211A. The opening / closing blade 412B of this embodiment is configured to open the passage 211A so that the discharging device is in communication with the liquefied gas storage tank 110. The pair of blades are arranged in a diaphragm manner around the fuel supply line 160 Or may be closed or separated to open or close the passage 211A. At this time, three or more blades may be in contact with or spaced from each other to provide a mechanism for opening or closing the passage 211A, which may be replaced with a driving mechanism of the translating blade 412B.

The manhole frame 210 and the manhole cover 220 of the present embodiment are installed in the upper part of the liquefied gas storage tank 110 and are provided with a fuel supply line 160 for delivering the LNG as in the first embodiment Of course.

Although the fuel supply outlet structure 400 in the present embodiment includes the manhole frame 210, the manhole cover 220 and the opening / closing part 410 as an example, The manhole cover 220 is omitted and the manhole cover of the manhole frame 210A is omitted and the opening and closing part 410 is installed at the lower part of the manhole frame 210A so that the opening 211 is opened by the opening and closing part 410, May be closed to prevent leakage of liquefied gas and BOG.

At this time, a sealing member (not shown) may be provided on the circumferential surfaces of the pair of blades contacting with each other and the pair of blades contacting the fuel supply line 160 to seal the passages 211.

8, the manhole frame 210A is different from the manhole cover for supporting the manhole cover 220. The function and shape of the manhole frame 210 are the same as or similar to those of the manhole frame 210 described above, Omit it.

As described above, in the present embodiment, the liquefied gas storage tank 110 is closed by the opening / closing part 410 at the time of normal, so that leakage of liquefied gas or BOG from the liquefied gas storage tank 110 is prevented, When the passage 211 is opened for repairing the pump 150, the discharge device is installed on the manhole frame 210 in a state where the liquefied gas storage tank 110 is closed by the opening / closing part 410, By opening the passage 211 after the passage 211 is sealed, the passage 211 is not exposed during the installation process of the discharge device, so that a safety accident caused by the BOG leakage can be prevented.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the same is by way of illustration and example only and is not to be construed as limiting the present invention. It is obvious that the modification and the modification are possible.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

100: LNG fuel supply system 110: LNG storage tank
111: outer tank 112: inner tank
113: Insulating section 120: Engine
130: High-pressure pump 140: Heat exchanger
150: booster pump 160: fuel supply line
170: fuel supply valve
200, 300, 400, 400A: fuel supply outlet structure
210, 210A: Manhole frame 220: Manhole cover
230, 310, 410: opening and closing parts 211, 211A:
310A: Through hole 311, 312: Rotating member
410: opening and closing part 411: sliding member
411A: driving member 412B: opening / closing blade
412: Guide member

Claims (6)

A manhole frame forming a passage of the liquefied gas storage tank; And
And an opening and closing unit provided in the manhole frame to open the passage so that a discharge device for discharging the fuel in the liquefied gas storage tank is installed, and closes the passage at a normal time,
The opening /
And a thin film which is crushed by the load of the discharging device due to the descent of the discharging device. The method according to claim 1,
And a manhole cover provided at an upper portion of the opening and closing part and supported by an upper end of the manhole frame to open and close the passage of the manhole frame. A manhole frame forming a passage of the liquefied gas storage tank; And
And an opening and closing unit provided in the manhole frame to open the passage so that a discharge device for discharging the fuel in the liquefied gas storage tank is installed, and closes the passage at a normal time,
The opening /
And a rotating member which is rotated by a load of the discharging device upon the descent of the discharging device to open the passage. The apparatus according to claim 3,
And a fuel supply outlet structure for a liquefied gas supply system, wherein the fuel supply outlet structure is rotated in a side-face shape at a lower portion of the manhole frame to open and close the passage. A manhole frame forming a passage of the liquefied gas storage tank; And
And an opening and closing unit provided in the manhole frame to open the passage so that a discharge device for discharging the fuel in the liquefied gas storage tank is installed, and closes the passage at a normal time,
The opening /
A sliding member that slides across the passage; And
And a guide member provided at a lower portion of the manhole frame to receive the sliding member. The sliding device according to claim 5,
An opening / closing blade moving to cross or expose the passage; And
And a driving member for moving the opening / closing blade. The fuel supply outlet structure for a liquefied gas supply system according to claim 1,

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