KR101239901B1 - Separating-type gas dome and cargo tank including the same - Google Patents

Abstract

The present invention discloses a separate gas dome provided in an LNG carrier and a cargo hold including the same.
The separable gas dome according to an embodiment of the present invention is a gas dome provided in a membrane-shaped cargo hold, which surrounds the hole formed in the gas dome and the hole, and is connected to an inner space connected to an IBS and an IS. A dome body including a double tube having an outer space, a first supply line connected to the inner space to supply nitrogen or an inert gas to the IBS, and connected to the outer space to supply the nitrogen or an inert gas to the ice And a second supply line, first and second outlets connected to the outer and inner spaces to discharge the evaporated gas remaining in the IBs and the Is to the outside, and a dome cover detachably attached to the dome body.

Description

Separable gas dome and cargo hold including it {SEPARATING-TYPE GAS DOME AND CARGO TANK INCLUDING THE SAME}

The present invention relates to a gas dome and a cargo hold, and relates to a separate gas dome provided in an LNG carrier and a cargo hold including the same.

In general, natural gas carriers (hereinafter referred to as LNG carriers) are vessels that store and transport liquefied natural gas (LNG), which liquefies gaseous natural gas to about -163 ° C. to be.

The cargo hold of LNG carriers must maintain rigidity even at cryogenic temperatures, and there are two types of spherical independent tank types and membrane types.

Among them, the membrane method is to seal the inner surface of the ship's cargo wall with a thin metal plate, which has the advantage of reducing the size of the hull and optimizing the installation of special equipment. It has the disadvantage of being vulnerable to external hull effects.

On the other hand, since the quality of natural gas collected and purified from the seabed is different for each collection region, the calorific value of combustion generated when combustion of natural gas is also different for each collection region. Therefore, before supplying natural gas to the user, nitrogen should be mixed to maintain the quality of the natural gas supplied to the user evenly.

The LNG carrier for transporting such LNG generates boil off gas (BOG) in which a part of LNG is vaporized in the cargo hold due to external heat or self vaporization such as direct sunlight of the sun during operation. The amount of evaporated gas evaporated in the cargo hold varies depending on winter or summer, but on average generates about 0.15% of the total stored gas per day.

The evaporated gas is discharged from the cargo hold through the safety valve when the preset safety pressure (0.25bar) or more, the discharged evaporated gas is used as a fuel of the boiler for the operation of the vessel, and various ways of utilization are being sought.

The LNG carrier for transporting such LNG includes a cargo hold for storing LNG therein and a gas dome for processing boil-off gas.

The cargo hold 10 of the LNG Carrier, as shown in FIG. 1, generally has a secondary barrier 12 and a secondary barrier of an insulation panel attached and fixed by stud bolts (not shown) inside the hull 1. It consists of the primary barrier 11 of the corrugation membrane (corrugation membrane) which is fixed by welding on the top of (12) to keep warm and sealed.

In addition, the cargo hold 10 of the LNG carrier has an interbarrier space (IBS) 14 and a secondary barrier 12 and a hull 1 which are spaces between the primary barrier 11 and the secondary barrier 12. Has an IS (Insulation Space) 15.

Here, a case in which the evaporation gas flows into the IBS 14 and the IS 15 may occur. In order to remove this residual evaporated gas, nitrogen gas or an inert gas is supplied to the IBS 14 and the IS 15, and then, the IBS connection line 24 of the gas dome 20 shown in FIG. 2. And it is discharged together with the evaporated gas through the ice connection line (25). Reference numeral 26, which is not described in FIG. 2, is an outlet for discharging the boil-off gas generated inside the cargo hold.

However, as shown in FIG. 2, the conventional gas dome 20 has an outlet 26 through which an evaporated gas is discharged, an IBS connection line 24, and an IS connection line 25 formed integrally with each other. 26) The IBS connection line 24 and the IS connection line 22 are located inside, which not only has a disadvantage in that the structure is complicated in comparison with its function, but also increases the manufacturing cost thereof.

In addition, in the case of the conventional cargo hold 10, since the liquid dome 30, in which a pipe for supplying an inert gas is formed separately from the gas dome 20, is required, not only the structure is complicated but also the manufacturing cost increases. .

In order to solve the above problems, an object of the present invention is to extend the cargo hold structure including the IBs and the Is to form a gas dome body, the inner and the connected to the IBS and the IS in the extended space, respectively; It is to provide a separate gas dome and a cargo hold including the same to form an outer space to simplify the gas dome structure.

In addition, the present invention is to provide a removable gas dome including a dome cover that can be separated or combined with the body of the gas dome and a cargo hold including the same.

The present invention provides a removable gas dome structure and a cargo hold including the same by providing a boarding means for moving a worker or equipment to a cargo hold in a hole inside the body of the gas dome, thereby increasing the ease of inspection or repair of the cargo hold.

According to one aspect of the invention, the removable gas dome according to an embodiment of the present invention is a gas dome provided in the membrane-shaped cargo hold, the inner side surrounding the hole and the hole formed in the gas dome, connected to the IBS (IBS) A dome body including a double tube having a space and an outer space connected to the IS; a first supply line connected to the inner space to supply nitrogen or an inert gas to the IBS; A second supply line connected to supply nitrogen or an inert gas to the ice cream; first and second discharge ports connected to the outer and inner spaces to discharge the boil-off gas remaining in the ice cream and the ice cream to the outside; And a dome cover detachably attached to the dome body.

In the separate gas dome according to the embodiment of the present invention, the dome cover is further connected to the dome cover, characterized in that it further comprises a flange which communicates with the hole in the inner tube to provide a movement path of the evaporated gas.

According to an embodiment of the present invention, a detachable gas dome may include: a boarding part on which an operator or equipment may ride; a support fixed to an upper end of the dome body; and at least one connection part connecting the boarding part to a predetermined portion of the support; The driving unit may further include a driving unit which moves the boarding unit up and down using the connection unit.

In addition, the separate gas dome according to the embodiment of the present invention can be applied to the cargo hold without the liquid dome.

The present invention extends the cargo hold structure including the IBS and the IS line to form a gas dome body, and forms the IBS and IS connecting line connected to a predetermined portion of the extended line to simplify the gas dome structure by forming the cargo hold. The manufacturing cost of can be lowered.

In addition, the present invention does not form a connection line for discharging the evaporated gas remaining in the IBs and IS lines to the outside inside the hole of the dome body, the vehicle means to move the operator or equipment inside the cargo compartment inside the cargo hold Can be provided. Thereby, the ease of inspection or repair of a cargo hold can be improved.

1 is a view showing a conventional cargo hold structure,
2 is a view showing the structure of a gas dome connected to a conventional cargo hold,
3 is a view showing the structure of a gas dome according to an embodiment of the present invention;
4 illustrates a dome cover in a gas dome according to an embodiment of the present invention;
5 is a view showing a structure installed inside the hole of the gas dome according to an embodiment of the present invention,
6 is an exemplary view showing an example of a hole internal structure according to an embodiment of the present invention.

The objects and effects of the present invention and the technical configurations for achieving them will be apparent with reference to the embodiments described below in detail with the accompanying drawings.

The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. This embodiment is provided only to make the disclosure of the present invention complete, and to fully convey the scope of the invention to those skilled in the art, and the present invention is defined by the scope of the claims. It is only. Therefore, the definition should be based on the contents throughout this specification.

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

3 shows a gas dome according to an embodiment of the invention.

Referring to FIG. 3, the gas dome according to the embodiment of the present invention is connected to the cargo hold 10 as shown in FIG. 1, and is a space between the primary barrier 11 and the secondary barrier 12. The evaporated gas generated from the cargo hold provided with 14 is the space 15 between the hull 1 and the secondary barrier 12.

As shown in FIG. 3, the gas dome according to the embodiment of the present invention supplies nitrogen or an inert gas to the IBS 14 and the IS 15 to discharge the remaining evaporated gas to the outside. The main body 100 and the dome cover 200 that can be detached from the dome main body 100 may be included. Here, the dome body 100 may include a double tube 130 and a hole 105, the double tube 130 is a cargo hold including the primary and secondary barriers (12, 14) and the insulation panel ( The structure of 10 may be extended. That is, the double tube body 130 may be formed of an inner space 120 connected to the IBS 14 and an outer space 110 connected to the ES 15. Reference numeral 170, which is not described in FIG. 3, is an inner hull.

Here, the double tube body 130 is formed in a structure that surrounds the hole 105 while having a cross-sectional shape such as a circular shape or a square shape, through which the evaporation gas generated inside the cargo hold 10 may be moved. Can be.

The gas supply unit 150 is connected to predetermined portions of the outer and inner spaces 110 and 120. The gas supply unit 150 supplies nitrogen or an inert gas to the IBS 14 connected to the inner space 120 and the IS 15 connected to the outer space 110. To this end, the outer and inner spaces 110 and 120 and the gas supply unit 150 may be connected by the first and second supply lines 140 and 145. In addition, the other portions of the outer and inner spaces 110 and 120 remain in the IBS 14 and the SS 15 together with nitrogen or an inert gas supplied through the first and second supply lines 140 and 145. First and second outlets 160 and 165 for discharging the boil-off gas may be connected.

According to an embodiment of the present invention, the dome body 100 is provided by forming a double tube 130 including outer and inner spaces 110 and 120 in which the cargo hold 10 structure extends, thereby providing the inside of the hole 105. Since the connection line connecting the IBS and the ISIs 14 and 15 is unnecessary, the structure of the gas dome can be simplified.

In addition, the gas dome according to the embodiment of the present invention may include a dome cover 200 detachable to the outer and inner spaces 110 and 120, for this purpose, as shown in Figure 4, the double tube 130 A plurality of coupling members 220 may be further included. Here, the coupling member 220 may be a bolt.

In addition, a flange 210 may be coupled to an upper portion of the dome cover 200 to allow an operator to detach the dome cover 200 from the double tube body 130. After disassembling the coupling member 220, the operator may grip the flange 210 to detach the dome cover 200 from the dome body 100.

In the gas dome according to an embodiment of the present invention, the flange 210 may be connected through a predetermined portion of the dome cover 200, and gas discharge means for discharging the evaporated gas discharged from the inside of the cargo hold 10 to the outside. It can be used as. That is, the evaporated gas discharged from the cargo hold 10 while the dome cover 200 and the double tube body 130 are connected may be discharged to the outside through the flange 210 which is in communication with the hole 105 of the dome body 100. Can be.

According to the gas dome according to the embodiment of the present invention, since the interior of the hole 105, unlike the conventional connection line connecting the IBS 14 and the IS 15 does not exist in the space of the hole 105 It may be used for the movement of workers or equipment for inspection or repair of (10).

To this end, the gas dome according to the embodiment of the present invention, as shown in Figure 5, the boarding unit 300, which the operator can ride inside the hole 105, and the support fixed to the upper end of the dome body 100 It may further include a connection portion 320 for connecting the support 310 and the boarding unit (310). The riding unit 300 may be formed in a basket form, as shown in FIG. 6. In addition, the connection part 320 may be a chain. That is, one end of the chain, which is the connecting part 320, is connected to each corner portion of the boarding part 300, and the other end of the chain is connected to the support 310, thereby making the boarding part 300 a hole of the dome body 100. 105) can be positioned inside. Here, the vehicle 300 may be moved up and down in the hole 105 by unwinding or winding the chain, which is the connection part 320, by using the driving part 330. The connection part 320 may be separated from the support 310 so that the passenger part 300 may be installed in the hole 105 only when necessary.

In addition, the support 310 may be formed by being recessed in the upper end of the double tube body 130 so as not to prevent the dome cover 200 from being coupled to the double tube body 130.

As described above, according to the structure of the gas dome according to the embodiment of the present invention, since the inside of the hole 105 of the dome body 100 is formed into an empty space, the worker or equipment can move inside the hole 105. The boarding unit 300 may be installed and moved. Accordingly, the gas dome according to the embodiment of the present invention can not only process the evaporated gas, but also can be used as a moving passage through which an operator or equipment can move.

The process of using the gas dome having the configuration as described above to process the evaporated gas, and to repair the cargo hold 10 will be described below.

First, the double tube body 130 and the dome cover 200 are coupled using the coupling member 220, and the evaporated gas discharged from the cargo hold 10 is connected through the flange 210 connected through the dome cover 200. It can be discharged to the outside.

In addition, the evaporation gas remaining in the IBS 14 and the IS 15 may be discharged to the outside by nitrogen or an inert gas supplied through the gas supply unit 150. More specifically, the first and second nitrogen or inert gases generated in the gas supply unit 150 are connected to predetermined portions of the outer and inner spaces 110 and 120 that extend the cargo hold structure to form the double tube 130. It is supplied to the IBS 14 and the IS 15 through the supply lines 140 and 145. The supplied nitrogen or inert gas, together with the residual evaporation gas inside the IBS 14 and the IS 15, is connected to the first and second outlets 160 and 165 to other portions of the outer and inner spaces 110 and 120. Is discharged through.

In addition, when the cargo hold 10 needs to be repaired, the operator separates the dome cover 200 from the dome body 100 using the flange 210, and the boarding unit 300 may be installed inside the hole 105. It can be moved into the cargo hold 10 by using. More specifically, the operator loads the equipment for inspecting the cargo hold 10 in the boarding unit 300 and then moves the boarding unit 300 downward through the operation of the driving unit 330 to equip the inside of the cargo hold 10. Can be moved.

Here, the boarding unit 300 may be installed in the dome body 100 only when the cargo hold 10 needs to be repaired, and thus the boarding unit 300 may not interfere with the movement of the evaporation gas.

On the other hand, the gas dome according to an embodiment of the present invention can be applied to the cargo hold without the liquid dome. For example, in the two-row cargo hold, a liquid dome may be formed only in some cargo hold for cost reduction, and thus there may be a cargo hold without the liquid dome. Here, the gas dome formed in each cargo hold is used as the gas dome according to the embodiment of the present invention to efficiently remove the IBs and the boil-off gas remaining in the IES.

In addition, when the gas dome according to the embodiment is applied to the cargo hold, the operator can enter and exit the cargo hold through the gas dome to maintain and repair the cargo hold.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, the invention is not limited thereto. Skilled artisans may modify or vary the embodiments described within the scope of the present invention. Each of the component members described herein may be implemented separately, or two or more may be integrated into one. It is to be understood that the components such as modules described in the specification and claims are merely functionally distinct and may be physically implemented in one means and that components such as means described as a single component Lt; / RTI > In addition, the various embodiments described in this specification may be implemented independently as well as in any combination. The scope of the present invention should, therefore, be determined not by the embodiments described, but by the appended claims and their equivalents.

100: dome body
105: hall
110, 120: 1st, 2nd extension line
130: tube
140, 145: first and second supply line
150 gas supply unit
160, 165: 1st, 2nd outlet
170: inner hull
200: dome cover
210: Flange
220: connection member
300: boarding unit
310: support
320: connection
330 drive unit

Claims (4)

A gas dome provided in a membrane cargo hold,
A dome body including a hole formed in the gas dome and a double tube surrounding the hole and having an inner space connected to an IBS and an outer space connected to an IS;
A first supply line connected to the inner space and supplying nitrogen or an inert gas to the IBS;
A second supply line connected to the outer space to supply nitrogen or an inert gas to the ice;
First and second outlets connected to the outer and inner spaces to discharge the ivy and the evaporation gas remaining in the esss to the outside;
It includes a dome cover detachable to the dome body
Detachable gas dome.
The method of claim 1,
The dome cover,
And a flange connected to the dome cover and communicating with a hole inside the tube to provide a movement path of the evaporation gas.
Detachable gas dome.
The method of claim 1,
A boarding area for the operator or equipment to board,
A support fixed to an upper end of the dome body;
At least one connection part connecting the vehicle to a predetermined portion of the support;
Further comprising a drive unit for moving the vehicle up and down using the connection portion
Detachable gas dome.
A separable gas dome according to any one of claims 1 to 3
Cargo hold.

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