KR102010882B1 - Insulation system of liquefied natural gas cargo and membrane install structure thereof - Google Patents

Abstract

The present invention relates to an insulation system of a liquefied gas cargo hold and a membrane arrangement structure of the insulation system. In the area (first zone) where a membrane is difficult to be disposed due to a specific structure such as a gas dome pipe of a cargo hold, an invar-free membrane In other areas (Second Zone), the membrane made of sus material is installed, and the membrane is installed by combining the advantages of invar and sus material, so that there is no interference between the gas dome pipe and the corrugation, and the workability is improved. The manufacturing cost can be reduced, and there is a very advantageous advantage in terms of structural verification or production. An anchoring member is installed at the boundary between the first and second zones, and the insulation panel and the flat membrane are located inside the anchoring member. It is configured to behave independently during heat shrinkage, so the effect of heat shrinkage of heat insulation panel is flat. Since it is not transmitted to the membrane, it is possible to prevent damages such as cracks and ruptures in advance and to improve insulation performance.

Description

INSULATION SYSTEM OF LIQUEFIED NATURAL GAS CARGO AND MEMBRANE INSTALL STRUCTURE THEREOF}

The present invention relates to an insulation system of a liquefied gas cargo hold and a membrane arrangement structure of the insulation system. More specifically, the inner compartment of the cargo hold is divided into an anchoring member into a first compartment and a second compartment. Since the membrane is installed by combining the advantages of Invar and Sus materials in the process of constructing the membrane to the outside, the workability is improved and it is very advantageous in terms of structural verification and fabrication. The present invention relates to an insulation system of a liquefied gas cargo hold and a membrane arrangement structure of the insulation system, which can be configured to behave independently to prevent damage such as cracks or rupture of the membrane in advance and to improve insulation performance.

Generally, liquefied natural gas storage tank of a carrier stores liquefied natural gas (Liquefied Natural Gas, hereinafter referred to as “LNG”) cooled to about -163 ° C, and is made of a material that can withstand cryogenic temperatures, thermal stress and heat. It is made of insulation structure that is strong in shrinkage and can block heat invasion.

The LNG storage tank (cargo tank) has a primary barrier, an upper insulation board, a secondary barrier and a lower insulation board from the inner side of the tank to the outer side, and is provided in combination with an inner hull.

Since the membrane used in the LNG storage tank is a cryogenic environment, there is a corrugation in consideration of shrinkage of the material.

Membrane materials commonly used in cargo hold insulation systems are invar and sus.

Invar has a small coefficient of heat shrinkage, which does not require separate wrinkles, but is relatively high in price, while Sus has a large coefficient of heat shrinkage and requires wrinkles, but the price is relatively low.

The LNG storage tank includes a pump tower for loading and unloading liquefied natural gas.

The pump tower is connected to the loading device to fill the liquefied natural gas into the storage tank, and is connected to the unloading device to discharge the liquefied natural gas from the storage tank. Includes various accessories

The pipe of the pump tower is provided in the form of a truss (pipe structure) structure. The pump tower is typically installed close to the bulkhead on the stern side and supported by a base support structure provided on the bottom of the storage tank in a fixed dome.

Membrane layout is complex around gas domes, liquid domes, or pump towers, and difficulties arise in terms of structural verification and fabrication.

In the case of Mark-III, which is widely used, corrugation exists, and a membrane is installed in a complex structure around a gas dome, a liquid dome, or a pump tower.

NO96 can be monotonous in shape / installation aspect because there is no corrugation due to the use of invar, but the disadvantage is relatively expensive.

1 is a perspective view showing a pleated membrane installed around a gas dome pipe, FIG. 2 is a cross-sectional view taken along the line A-A of FIG. 1, and FIG. 3 is a cross-sectional view taken along the line B-B of FIG.

First, as shown in FIGS. 1 and 2, a welding strip 20a is installed on an upper surface of the secondary insulation panel 20, and a secondary membrane 21 made of Invar is welded on the welding strip 20a. Is sealed and installed. Since the secondary membrane 21 is made of an Invar material, which is advantageous for heat shrinkage, the secondary membrane 21 does not have wrinkles.

As shown in FIG. 3, the welding strip 10a is installed on the upper surface of the primary insulation panel 10, and the primary membrane 11 made of sus material is welded and sealed on the welding strip 10a. The primary membrane 11 has a wrinkle 11a because it is detrimental to heat shrinkage.

However, when the primary membrane 11 is installed in the related art, various problems such as interference between the gas dome pipe 1 and the pleats occur, and a separate mold must be manufactured to weld the complex shape of the pleats. This results in complex membrane placement and difficulties in structural verification and fabrication.

Korean Patent Publication No. 10-2005-0050170

The present invention is to solve the above-mentioned problems, in the area (1 area) difficult to place the membrane in the cargo hold due to the specific structure, such as the gas dome pipe of the cargo hold to construct the membrane of the Invar without wrinkles and other areas In the second zone, by installing a membrane made of sus material and installing the membrane by combining the advantages of invar and sus material, there is no interference between the gas dome pipe and the corrugation, and the workability is improved and the manufacturing cost can be reduced. The present invention provides a thermal insulation system of a liquefied gas cargo hold and a membrane arrangement structure of the thermal insulation system, which has a very advantageous advantage in terms of structural verification and fabrication.

In addition, the present invention is to install the anchoring member at the boundary between the first zone and the second zone, the insulation panel and the flat membrane located in the interior of the anchoring member to be configured to behave independently without interference with each other during thermal contraction, The effect of heat shrinkage is not transmitted to the flat membrane to provide damage to the membrane cracks and tears in advance, and to provide a thermal insulation system of the liquefied gas cargo hold and membrane arrangement structure of the insulation system that can improve the insulation performance. have.

In order to achieve the above object, the present invention provides an insulation system of the liquefied gas cargo hold and a membrane arrangement structure of the insulation system.

Insulation system of the liquefied gas cargo hold according to the present invention, when the internal zone of the cargo compartment is divided into a first zone in which a specific structure is installed, and the remaining second station except the first zone, the first zone and the second Anchoring members installed at the boundary of the zone; A flat membrane connecting the anchoring member and the specific structure to the inside of the anchoring member; And a corrugated membrane connected to the anchoring member to the outside of the anchoring member.

The specific structure may include any one of a pump tower, a gas dome, and a liquid dome.

The flat membrane may be made of an Invar material, and the pleated membrane may be made of a sus material.

The anchoring member may include a frame portion forming a rectangular frame and a membrane connection portion formed on inner and outer surfaces of the frame portion.

An inner part of the anchoring member may be formed with an inva connection membrane connection part to be connected to the flat membrane, and an outer part of the anchoring member may be formed with a membrane connection part for connection to the suspend membrane.

The membrane connecting portion for connecting the Invar may be seated in the groove formed on the upper surface of the insulating panel to maintain the same height as the upper surface of the insulating panel.

The membrane connection part for the sustain connection may be seated in a groove formed on the upper surface of the insulating panel to maintain the same height as the upper surface of the insulating panel.

The thermal insulation panel and the flat membrane positioned inwardly of the anchoring member may be configured to behave independently from each other during thermal contraction.

On the other hand, the membrane arrangement structure of the insulation system according to the present invention is divided into the first zone and the second zone except the first zone, the inner zone of the cargo hold is installed, the first zone and the first An anchoring member is installed at the boundary of the two zones, and based on the anchoring member, the first zone is sealed with a flat membrane made of Invar, and the second zone is configured to seal a corrugated membrane made of sus material.

The inba material flat membrane and the insulation panel installed in the first zone are configured to behave independently from each other during heat shrinkage.

As described above, in the area (or location) of the cargo hold, invasion-free membranes are constructed in areas where membrane placement is difficult due to certain structures such as gas dome pipes (first area), In Zone 2), by installing a membrane made of sus material, and installing the membrane combining the advantages of invar and sus material, there is no interference between the gas dome pipe and the corrugation. Since there is no need to manufacture, it is possible to improve the workability and reduce the manufacturing cost, there is a very advantageous advantage in terms of structural verification or production.

In addition, the anchoring member is installed at the boundary between the first zone and the second zone, and the insulation panel and the flat membrane positioned inside the anchoring member are configured to behave independently during the heat shrinkage, so that the influence of the heat shrinkage of the insulation panel is reduced. Since it is not transmitted to the flat membrane, it is possible to prevent damage such as cracking or rupture of the membrane in advance and to improve insulation performance.

1 is a perspective view of a pleated membrane installed around a gas dome structure
2 is a cross-sectional view taken along the line AA of FIG.
3 is a cross-sectional view taken along line BB of FIG.
Figure 4 is a perspective view showing the first zone and the second zone in the insulation system of the liquefied gas cargo hold of the present invention and the membrane arrangement of the insulation system according to the present invention;
FIG. 5 is a perspective view illustrating a secondary insulation panel of a first zone and a secondary insulation panel of a second zone; FIG.
6 is a perspective view of the primary and secondary membranes of the second zone and the secondary insulating panels of the first zone;
7 is a perspective view of the secondary membrane of the second zone and the secondary membrane of the first zone;
8 is a perspective view of the gas dome structure and the anchoring member;
9 is a cross-sectional view taken along line CC of FIG. 4.
10 is a cross-sectional view for explaining the behavior of the membrane and the insulation panel during heat shrinkage

Hereinafter, the insulation system of the liquefied gas cargo hold of the present invention and the membrane arrangement structure of the insulation system will be described in detail with reference to the accompanying drawings.

1 is a perspective view showing a pleated membrane installed around a gas dome structure, FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1, FIG. 3 is a cross-sectional view taken along the line BB of FIG. 1, and FIG. 4 is an embodiment of the present invention. 1 and 2 are perspective views of the insulation system of the liquefied gas cargo hold and the membrane arrangement of the insulation system.

And FIG. 5 is a perspective view showing the secondary insulation panel of the first zone and the secondary insulation panel of the second zone, and FIG. 6 is the primary and secondary membranes of the second zone and the secondary insulation panel of the first zone. 7 is a perspective view illustrating the secondary membrane of the second zone and the secondary membrane of the first zone, and FIG. 8 is a perspective view illustrating the gas dome structure and the anchoring member.

Referring to the drawings, the membrane arrangement structure of the insulation system according to the present invention is divided into a first zone in which the specific structure (1) is installed, and the second zone except for the first zone when the interior area of the cargo hold is divided into An anchoring member 300 is installed at the boundary between the first zone and the second zone, and the first zone is sealed with the flat membranes 210 'and 110' of the Invar material based on the anchoring member 300, and the second zone is installed. There is a structure in which the corrugated membrane (210,110) made of sus material is installed.

The insulation system of the liquefied gas cargo hold according to the present invention may be divided into a first zone in which the specific structure 1 is installed and a second zone except for the first zone. In this case, the first zone and the second zone may be set to the zones selected in advance for convenience of explanation and vice versa.

In the present embodiment, the specific structure 1 is not limited to a pump tower, a gas dome, a liquid dome, and may include all other facilities that cause interference when installing a membrane. In the drawings, a specific structure will be described using a gas dome pipe as an example.

The insulation system of the liquefied gas cargo hold according to the present invention is provided with an anchoring member 300 that can distinguish the first zone and the second zone.

The anchoring member 300 is installed at the boundary between the first zone and the second zone, and includes a frame portion 310 forming a rectangular border and a membrane connection portion 320 formed on the inner and outer surfaces of the frame portion 310. It may be provided. The anchoring member 300 may be made of sus or invar material. Although not shown in the drawings, the lower end of the anchoring member 300 may be fixed to the hull inner wall (inner hull) side by welding or the like.

In the present embodiment, the anchoring member 300 is described as being configured as a quadrangle, but may be changed to another shape according to design conditions.

Inside the anchoring member 300, flat membranes 210 ′ and 110 ′ that connect between the anchoring member 300 and the gas dome pipe 1 are installed.

The flat membranes 210 'and 110' are formed of a secondary flat membrane 210 'positioned above the secondary insulation panel 200' and a primary flat membrane positioned above the primary insulation panel 100 '. 110 '. The flat membranes 210 ′ and 110 ′ may be made of an Invar material.

Outside the anchoring member 300 is provided with a corrugated membrane (210, 110) connected to the anchoring member (300). The corrugated membranes 210 and 110 may be made of a sus material.

The pleat membranes 210 and 110 may be composed of a secondary pleat membrane 210 positioned on the upper side of the secondary insulation panel 200 and a primary pleat membrane 110 positioned on the upper side of the primary insulation panel 100. have.

The secondary corrugation membrane 210 is welded onto the welding strip 200a formed on the upper surface of the secondary insulation panel 200, and the primary corrugation membrane 110 is formed on the upper surface of the primary insulation panel 100. 100a) can be welded on.

Inner connecting membrane connecting portions 322 ′ and 321 ′ are formed inside the anchoring member 300 to be connected to the flat membranes 210 ′ and 110 ′, and pleated membranes 210 and 110 are formed outside the anchoring member 300. In order to be connected to the membrane connection portion 322,321 for connection may be formed.

The membrane connecting portions 322 'and 321' for connecting the Invar are seated in grooves (steps 201 and 101) formed on the upper surfaces of the insulating panels 200 'and 100', and are the same as the upper surfaces of the insulating panels 200 'and 100'. You can keep the height. When the membrane connecting portions 322 'and 321' for connecting the Invar are the same height as the upper surfaces of the insulating panels 200 'and 100', the insulation level can be maintained by maintaining the level of the membrane uniformly when sealing the membrane. have.

The membrane connection parts 322 and 321 for connection to the susing may be mounted on grooves (steps 201 and 101) formed on the upper surfaces of the insulating panels 200 and 100, and may maintain the same height as the upper surfaces of the insulating panels 200 and 100. When the membrane connection parts 322 and 321 for connection are made flush with the upper surfaces of the insulation panels 200 and 100, the insulation level may be maintained by maintaining the level of the membrane even when the membrane is sealed.

The insulation panels 200 ′ and 100 ′ and the flat membranes 210 ′ and 110 ′ positioned inward of the anchoring member 300 may be configured to behave independently during heat shrinkage. In other words, the flat membrane 210 ', 110' is welded directly to the inva connection membrane connection portion 322 ', 321', rather than the structure in which the inva material flat membrane is welded to the welding strip as before. The insulation panels 200 'and 100' and the flat membranes 210 'and 110' will behave independently of each other.

In the insulation system of the liquefied gas cargo hold of the present invention configured as described above, taking advantage of Invar and Sus, the second zone (standard zone) constructs a membrane made of sus material having corrugation, and the specific zone of the cargo hold. In areas where it is difficult to place due to a specific structure (eg gas dome) in the (or location), a membrane of invar material without wrinkles is constructed, combining the advantages of invar and sus material By installing the membrane, there is no interference between the gas dome pipe 1 and the corrugation, and there is no need to manufacture a separate mold to weld the complex shape of the corrugation, thereby improving workability and reducing manufacturing cost. It is also very advantageous in terms of structural verification and manufacturing.

Meanwhile, referring to FIG. 2, in the conventional structure, the welding strip 20a is installed on the upper surface of the secondary insulation panel 20, and the secondary membrane 20 made of Invar is welded to the welding strip 20a. , The secondary heat insulating panel 20 is thermally contracted in the direction of the arrow by the cryogenic liquid gas and behaves. At this time, since the secondary membrane 20 is welded to the welding strip 20a, the secondary membrane 20 also receives a force to behave together with the behavior of the secondary insulation panel 20. That is, the secondary membrane 20 is also stressed to behave in the direction of the arrow.

However, since the Invar membrane has a very small coefficient of thermal shrinkage and does not have wrinkles, the secondary membrane 20 is continuously stressed to behave in the direction of the arrow. In this case, serious problems that cause damage such as cracks and tears occur.

In order to solve this problem, in this embodiment, the thermal insulation panels 200 'and 100' and the flat membranes 210 'and 110', which are positioned inward of the anchoring member 300 in the first zone, are independently subjected to heat shrinkage. Can be configured to behave.

That is, the flat membrane is not welded to the welding strip as in the past, but the flat membranes 210 'and 110' are directly welded to the membrane connecting portions 322 'and 321' for connecting to Invar, so that the heat insulation panel ( 200 'and 100') and the flat membranes 210 'and 110' behave independently of each other.

Therefore, as shown in FIGS. 9 and 10, the effect of the heat shrinkage of the thermal insulation panels 200 ′ and 100 ′ is not transmitted to the flat membranes 210 ′ and 110 ′. That is, since the flat membranes 210 'and 110' are positioned independently of the behavior of the heat insulation panels 200 'and 100' during heat shrinkage, the flat membranes 210 'and 110' are not affected by the shrinking of the heat insulation panels 200 'and 100', and thus the panel center is not affected. Only the stress caused by the heat shrinkage of the line centers itself, and this small stress is enough to be tolerated by the flat membranes 210 'and 110', thus preventing damage such as cracking or rupture of the flat membrane. Can effectively prevent.

In addition, in the present embodiment, the heat insulation panels 200 and 100 and the flat membranes 210 and 110 positioned to the outside of the anchoring member 300 in the second zone may be configured to behave independently during heat shrinkage. That is, the flat membrane is welded directly to the welding strip, as in the past, as the flat membranes 210 and 110 are directly welded to the membrane connection portions 322 and 321 for connection to the connection, the effect of the heat shrink of the thermal insulation panels 200 and 100 is flat membrane It is not delivered to (210,110). That is, the flat membranes 210 'and 110' are independent of the deformation of the thermal insulation panels 200 'and 100' during thermal contraction, and operate independently of the thermal insulation panels 200 'and 100', and the flat membrane itself By only receiving a minute stress (absorbable) due to the heat shrink by, it is possible to further improve the thermal insulation.

As described above, the present invention is not limited to the described embodiments, and various modifications and changes can be made without departing from the spirit and scope of the present invention, which will be apparent to those skilled in the art. Therefore, such modifications or variations will have to be belong to the claims of the present invention.

For example, in the description of the present invention, the primary insulation panel and the secondary insulation panel are divided into insulation panels adjacent to the liquefied gas and insulation panels adjacent to the inner wall of the hull, respectively. This may be reversed and vice versa.

In addition, the thickness of the heat insulation panel and the membrane is not limited to the above because it is merely shown arbitrarily for convenience of description.

In addition, the expression of the upper (upper) and lower (lower) is also arbitrarily set for convenience of description, it is not limited to this, of course, it can be changed in reverse depending on the position and viewing direction of the nature of the cargo hold.

1: specific structures
100a: welding strip
200a: welding strip
201,101: groove part (short jaw)
200, 100: insulation panels (secondary and primary insulation panels in the second zone)
200 ', 100': Insulation panel (2nd and 1st insulation panels in Area 1)
210 ', 110': flat membrane made of Invar
210,110: corrugated membrane made of sus material
300: anchoring member
310: frame part
320: membrane connection

Claims (10)

An anchoring member installed at a boundary between the first zone and the second zone when the inner zone of the cargo compartment is divided into a first zone where a specific structure is installed and a second zone other than the first zone;
A flat membrane connecting the anchoring member and the specific structure to the inside of the anchoring member; And
A pleated membrane connected to the anchoring member outward of the anchoring member; Including,
An inner part of the anchoring member is formed with a membrane connection for connecting the inva in order to connect with the flat membrane,
Insulation system of the liquefied gas cargo hold is characterized in that the outer membrane connecting portion for the connection to the corrugated membrane is formed to the outer side of the anchoring member. The method according to claim 1,
Said particular structure is any one of a pump tower, a gas dome, a liquid dome, the insulation system of a liquefied gas cargo hold. The method according to claim 1,
The flat membrane is composed of Invar material, the pleated membrane is insulated system of liquefied gas cargo hold, characterized in that composed of sus material. The method according to claim 1,
The anchoring member includes a frame portion forming a rectangular border,
The inva connection membrane connection portion is formed on the inner surface of the frame portion, the susplay membrane connection portion is formed on the outer surface of the frame portion, the insulation system of the liquefied gas cargo hold. delete The method according to claim 1,
The membrane connecting portion for connecting the Invar is seated in the groove formed on the upper surface of the insulation panel, the insulation system of the liquefied gas cargo hold, characterized in that to maintain the same height as the upper surface of the insulation panel. The method according to claim 1,
The membrane connection portion for the sustain connection is seated in the groove formed on the upper surface of the insulating panel insulation system of a liquefied gas cargo hold, characterized in that to maintain the same height as the upper surface of the insulating panel. The method according to claim 1,
Insulating panel and the flat membrane positioned inwardly of the anchoring member is configured to behave independently during the heat shrink liquefied gas cargo insulation system. delete delete

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