KR100499710B1 - Lng storage tank installed inside the ship and manufacturing method the tank - Google Patents

Abstract

The present invention relates to a tank structure for storing liquefied natural gas installed in a vessel, and simplifies the tank structure installed in a vessel for transporting liquefied natural gas, which is a liquid in cryogenic state, to shorten the assembly process and at the same time, liquid tightness. It is an object of the present invention to provide a liquefied natural gas storage tank structure that is installed inside the ship that can more easily resolve the stress due to mechanical deformation while maintaining a firm. In order to achieve the above object, the liquefied natural gas storage tank structure according to the present invention is a storage tank installed inside the hull of a vessel for storing liquefied natural gas, comprising two consecutive sealing walls and two insulating walls In the storage tank structure of the sealing wall, the primary sealing wall is in contact with the liquefied natural gas stored in the storage tank, and disposed below the primary insulating wall, the secondary sealing wall and the secondary insulating wall. The primary sealing wall is supported by an anchor part mechanically coupled to the hull, and the thermal insulation wall is slidably installed between the primary sealing wall and the inner wall surface of the hull.

Description

Tank structure for liquefied natural gas storage and tank manufacturing method installed inside ship {LNG STORAGE TANK INSTALLED INSIDE THE SHIP AND MANUFACTURING METHOD THE TANK}

The present invention relates to a tank structure for storing liquefied natural gas installed inside a ship, and more particularly, to simplify the tank structure installed inside a ship for transporting liquefied natural gas, which is a liquid in an ultra low temperature state, to shorten the assembly process. At the same time, the present invention relates to a tank structure for liquefied natural gas storage installed inside a ship that can more easily relieve stress due to mechanical deformation while maintaining liquid tightness and a method of manufacturing the tank.

In general, liquefied natural gas (Liquefied Natural Gas) storage tanks installed in the LNG carrier can be divided into independent tank type (Membrane Type). This is a classification according to whether the load of the cargo directly acts on the insulation, the details are as follows.

In Table 1, aka GTT NO 96-2 type and GTT Mark III type were renamed Gaz Transport (GT) and Technigaz (TGZ) in 1995 as GTT (Gaztransport & Technigaz), respectively, GT type was GTT NO 96 -2 type, TGZ type is renamed GTT Mark III type.

division Membrane Type Independent Tank Type GTT Mark III GTT NO 96-2 MOSS IHI-SPB Tank Material-Thickness SUS 304L-1.2 mm Invar steel-0.7 mm AL alloy steel (5083)-50 mm AL alloy steel (5083) 30 mm Heat dissipation material-thickness Reinforced Polyurethane Foam-250 mm Plywood Box + Perlite-530 mm Polyurethane Foam-250 mm Polyurethane Foam-200 mm

GTT's membrane type LNG carriers are equipped with a cofferdam in order to directly insulate the insulation and the hull and to avoid the risk of mechanical and thermal characteristics between the cargo tank and the cargo tank. In order to prevent low temperature brittleness of the inner hull of the cofferdam, it should be maintained at + 5 ° C or higher. For this purpose, heating means such as heating coils are generally installed to use a heat source such as steam or hot water. Insulation construction is completed by installing the chiefs in the hull first, then installing the chiefs and the insulation boxes, membranes and other materials completed on land. In the case of older tanks, the membrane method has a longer post-launch time compared to a longer working period before launch.

As shown in FIGS. 1 and 2, the NO 96-2 type of GTT's membrane type uses Invar steel (36% Ni) having a thickness of 0.5 to 0.7 mm, and a primary sealing wall 10. And the secondary sealing wall 15 has almost the same degree of liquid tightness and strength, so that the secondary sealing wall 15 alone can safely support the cargo for a considerable period of time upon leakage of the primary sealing wall 10. Also, the sealing walls 10 and 15 of GTT NO 96-2 type have a straight membrane, so welding is easier than that of Mark III type membrane, and the automation rate is high, but the overall welding site has a long GTT NO 96-2 type. .

In addition, the biggest difference between the existing GT type and the currently adopted GTT NO 96-2 type is the use of the Double Couple (17) instead of the U-shaped bar supporting the insulation box (insulation walls; 11, 16). It is. The functions of the main parts of the heat dissipation section of the storage tank of GTT NO 96-2 type LNG carrier are shown in Table 2.

division function Tongue It is installed in the insulation wall box, and it is connected by welding three layers between the membrane sheet and the membrane sheet, and connects the membrane wall box with the membrane. Joist It is installed between the insulation wall box and the insulation wall box to alleviate the horizontal displacement and prevent the occurrence of high stress. Primary and Secondary Insulation Wall (Perlite) Prevent heat from entering the storage tank. Primary Sealed Wall (Invar) The storage tank is primarily composed of the part where the cargo of -163 ℃ directly contacts with the primary sealing wall. Second Sealing Wall (Invar) As a secondary method, it prevents the leakage of cargo for a certain period of time when the primary membrane is broken.

On the other hand, Mark III type of GTT, as shown in Figure 3 and 4, is a stainless steel membrane (Membrane) with a 1.2 mm thick corrugation to the primary sealing wall 20, the shrinkage due to low temperature is Absorbed from the pleats, little stress is generated in the membrane. In addition, Balsa material, Glass Wool, Triplex, etc. are used as the material of the insulation walls 21 and 26. Mark Ⅲ type is equipped with the primary and secondary insulation walls (Insulation) (21, 26) onshore and is integrally mounted, so that the box-shaped primary and secondary insulation walls (21, 26) must be installed, respectively GTT NO Construction is relatively easy compared to 96-2 type.

The function of the main part of the heat dissipation section of the LNG carrier storage tank of the GTT Mark III type is shown in Table 3 below.

division function Mastic Transfer the load from the storage tank to the hull. Plywood It is installed between the primary and secondary sealing walls and the primary and secondary insulating walls. The uniform arrangement of the insulating walls helps to receive a constant load on the sealing walls, and alleviates the displacement caused by the vertical load. Glass wool It is installed between the insulation wall box and the insulation wall box to alleviate the horizontal displacement and prevent the occurrence of high stress. Primary and Secondary Insulation Walls (Polyurethane Foam) Prevent heat from entering the storage tank. Secondary sealing wall (Triplex Flex) When the primary membrane, which is the primary sealing wall, is damaged, it has the function of preventing the leakage of cargo for a certain period of time. Glass cloth is attached to both sides of Al Foil. Primary sealing wall (SUS 304L) It is the first membrane and the cargo tank that directly touches about -160 ℃. The cargo tank is composed primarily of corrugated structure to withstand thermal stress.

The corner part occupies an important part of the GTT NO 96-2 type storage tank structure and the GTT Mark III type storage tank structure having the above structure.

The corner portion (edge) in the LNG storage tank is a zone in which load due to thermal deformation of each sealing wall (membrane) constituting the storage tank acts asymmetrically. It must be constructed structurally to relieve stress.

The membrane type LNG storage tank described above can reduce the BOG (boiled off gas) loss due to the vaporization of LNG, which is a cryogenic liquid, simplify the complex insulation and sealing wall structure, reduce the tank drying period by simplifying the manufacturing process, Efforts have been made over the decades in terms of stress relief at corners and sealing walls of tank sections, but there is still a need for further improvements.

Therefore, the present invention is to invent a membrane-type LNG storage tank of a new structure different from the conventional membrane-type LNG storage tank to improve the various problems.

The present invention proposes a new LNG storage tank structurally different from the conventional LNG storage tank, the assembly structure and manufacturing process is simplified to shorten the drying period of the tank, as well as to store the liquefied natural gas stored in the storage tank And to provide a liquefied natural gas storage tank having a new structure and a method of manufacturing the tank to more efficiently eliminate the thermal / mechanical stress generated from the discharge.

In order to achieve the above object, the liquefied natural gas storage tank structure according to the present invention is a storage tank installed inside the hull of a vessel for storing liquefied natural gas, comprising two consecutive sealing walls and two insulating walls The first sealing wall of the sealing wall is in contact with the liquefied natural gas stored in the storage tank, the lower portion of the structure of the storage tank disposed in the order of the primary insulating wall, the secondary sealing wall and the secondary insulating wall. The primary sealing wall is supported by an anchor part mechanically coupled to the hull, and the heat insulating wall is slidably installed between the primary sealing wall and the inner wall surface of the hull.

Preferably, the primary heat insulating wall and the secondary heat insulating wall may be adhered to each of the upper and lower surfaces of the secondary sealing wall by an adhesive. In addition, the secondary insulating wall may include a polyurethane foam insulation and a plywood plate bonded to the lower surface thereof. In addition, the primary insulation wall may include a polyurethane foam insulation and a plywood plate bonded to the upper surface thereof. In addition, the material of the secondary sealing wall may be an aluminum sheet or a flexible sheet (Triplex).

On the other hand, the secondary sealing wall may be formed to protrude more than the cross-section of the primary insulating wall and the secondary insulating wall. Here, the primary sealing wall may be made of stainless steel. In addition, the primary sealing wall may be formed wrinkles.

In addition, the space formed between the secondary insulating wall may be filled with a heat insulating material made of polyurethane foam. On the other hand, the space formed between the primary insulating wall may be filled with a heat insulating material of glass wool (Glass Wool) material.

The secondary sealing wall may be connected and fixed by a lower fixing plate and an upper fixing plate positioned above and below the secondary sealing wall protruding from the space formed by the secondary insulating wall. In addition, the lower fixing plate and the upper fixing plate may connect and fix the secondary sealing wall in a curved form.

Tank structure for liquefied natural gas storage according to a preferred embodiment is a corner structure coupled to the corner portion of the inside of the hull, a planar structure slidably located on the plane inside the hull, coupled to the hull the plane It may include an anchor structure for attaching a structure inside the hull.

Here, the planar structure is formed on the upper surface and the planar secondary insulation wall is installed at the same height as the corner secondary insulation wall while the one side is fixed by the corner boundary jaw that the corner structure is fixed, The planar secondary sealing wall and the planar primary insulating wall formed on the upper surface thereof may be manufactured as a preassembly.

In addition, the anchor structure is an anchor rod which is fixed to the anchor lower plate that is mechanically fixed to the corner portion where the planar structure meets, the center of the anchor rod is fixed to the anchor rod is installed at the same height as the second insulating wall A secondary secondary insulating wall and an anchor secondary sealing wall mechanically fastened to a neighboring flat portion secondary sealing wall while being inserted into a central portion of the anchor rod and fixed to an upper surface of the anchor secondary insulating wall; The anchor rod may include an anchor portion primary heat insulation wall inserted into an anchor rod and fixed to an upper surface of the anchor secondary seal wall, and an upper cap fixed to an upper portion of the anchor rod, which is an upper center portion of the anchor primary insulation wall. have.

On the other hand, the corner structure is a corner portion secondary heat insulating wall formed in the L shape so as to interview each corner point where the surface formed inside the hull of the ship, and the corner secondary sealing wall formed on the upper surface thereof and the upper portion thereof The inner surface of the ship's hull is made of a pre-assembly provided with a corner portion primary insulation wall formed on the surface and an L-shaped corner support plate is further installed on the upper portion of the corner portion primary insulation wall to receive an asymmetrical load of the storage tank. It can be fixed by the corner boundary jaw formed in each.

The method for manufacturing a liquefied natural gas storage tank according to the present invention is a storage tank installed inside a hull of a vessel for storing liquefied natural gas, comprising two continuous sealing walls and two heat insulating walls, wherein The primary sealing wall is in contact with the liquefied natural gas stored in the storage tank, the method of manufacturing a storage tank arranged in the order of the primary insulating wall, the secondary sealing wall and the secondary insulating wall in the lower portion, the vessel Forming boundary jaws at corner portions formed in the hull of the ship, and fixing and fixing the anchor base plate at regular intervals on the inner surface of the hull; Attaching and fixing a corner structure pre-assembled with a secondary heat insulation wall, a secondary sealing wall, a primary heat insulation wall, and a corner support plate, based on the formed corner boundary jaw; Fixing the fixed corner structure to the corner boundary jaw as a fixing stand, and fixing the anchor lower plate on the anchor base plate and vertically fixing the anchor support rod in the center thereof; One side of the flat structure pre-assembled with the secondary heat insulation wall, the secondary sealing wall, and the primary heat insulation wall is fixed to one side of the fixing station to which the corner structure is fixed, and the other edge portion of the flat structure is the anchor base plate and the Inserting and fixing the space formed by the anchor lower plate; Filling a space formed by the secondary insulating wall of the corner structure and the planar structure with a heat insulating material, and inserting the anchor part secondary heat insulating wall and the anchor part secondary sealing wall into the anchor supporting rod; Fixing the secondary sealing wall of the corner structure and the secondary sealing wall of the planar structure adjacent thereto, fixing the secondary sealing wall of the planar structure to each other, and simultaneously adjoining the secondary sealing wall of the planar structure. Fixing the anchor portion secondary sealing wall to each other; Inserting an anchor portion primary insulation wall into the anchor support rod, and then fixing and fixing the anchor top plate and the anchor insulation plate and attaching and fixing the anchor upper cap to the end of the anchor support rod to complete the assembly of the anchor structure; Filling the spaces between the primary insulation walls formed by the corner structures, the planar structures, and the anchor structures with insulation; And attaching and fixing a primary sealing wall having corrugations on the upper surfaces of the corner structure, the planar structure, and the anchor structure.

Fixing the anchor lower plate on the upper portion of the anchor base plate and vertically fixing the anchor support rod in the center portion is fixed by fixing the anchor support rod bolted to the rod support cap fixed to the center portion of the anchor lower plate bolted to the anchor base plate Can be. Filling the space formed by the secondary insulating wall of the corner structure and the planar structure with a heat insulating material may be filled with polyurethane foam as a heat insulating material.

Further, the secondary sealing wall of the corner structure and the secondary sealing wall of the planar structure adjacent thereto are fixed, and the secondary sealing wall of the planar structure is mutually fixed, and adjacent to the secondary sealing wall of the planar structure. The fixing of the anchor portion secondary sealing wall may be fixed by bolting a lower fixing plate positioned below the secondary sealing wall and an upper fixing plate positioned to face the upper surface thereof. Here, the secondary sealing wall of the corner structure and the secondary sealing wall of the planar structure adjacent thereto are fixed, and the secondary sealing wall of the planar structure is fixed to each other and at the same time adjacent to the secondary sealing wall of the planar structure. The fixing of the anchor portion secondary sealing wall to each other may be fixed in a curved shape by a curved portion formed on the lower fixing plate for bolting the secondary sealing wall and the upper fixing plate positioned to face the upper surface thereof.

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

Tank for liquefied natural gas storage according to the present invention is a secondary heat insulation wall is installed to interview the surface formed inside the hull of the ship, the secondary sealing wall formed on the upper surface thereof and the primary heat insulation wall formed on the upper surface thereof In the present invention, such a tank is to be pre-fabricated in the tank inner space by manufacturing a corner structure, a planar structure in advance as a pre-assembly from the vessel, respectively.

That is, the pre-fabricated corner structure is first fixed inside the hull, and then a flat structure based on this is assembled. The fixing of the flat structure is performed by assembling the anchor structure at the assembly site of the tank.

5 is a cross-sectional view showing the internal structure of the corner structure constituting the tank structure for liquefied natural gas storage according to the present invention, the corner structure 100, the corner portion so as to interview each of the corner point where the hull surface of the ship meets The secondary heat insulation wall 53 is formed in an L shape, and the corner secondary sealing wall 52 is attached and fixed to the upper surface thereof in the same shape, and the corner primary heat insulation wall 51 is formed on the upper surface thereof again. It is pre-assembled into a structure that is formed. Here, the corner portion primary insulation wall 51 and the corner portion secondary insulation wall 53 are adhered to the upper and lower surfaces of the corner portion secondary sealing wall 52 by adhesive to be firmly fixed.

In addition, the corner secondary insulating wall 53 is formed of a heat insulating material 58 of polyurethane foam (Polyurethane Foam) material, and a plate 56 of plywood (Plywood) material bonded to the lower surface thereof, The corner portion primary insulation wall 51 is also formed of a polyurethane foam insulation 57 and a plywood plate 54 bonded to upper and lower surfaces thereof.

In addition, the upper surface of the corner primary insulating wall 51 is further pre-assembled by the L-shaped corner support plate 50 is installed to receive an asymmetrical load of the storage tank, the corner support plate 50 by heat Rather than bonding with the adhesive with the primary heat insulating wall 51 to enable contraction and extension, it is mechanically coupled to the sliding movement.

Meanwhile, the corner secondary insulating wall 53 and the corner primary insulating wall 51 of the corner structure 100 preliminarily assembled in the above structure protrude through the corner secondary insulating wall 53. The corner support plate 50 is mechanically coupled by a lower support rod 60 and a connecting reinforcement 90 which connects and fixes the lower end of the upper support rod 70 passing through the corner primary insulation wall 51. ) Is supported.

Here, the lower support rod 60 is inserted into and fixed to the rod support cap 61 fixed to the lower surface of the corner secondary insulating wall 53 to penetrate the corner secondary insulating wall 53. The upper end is to be mechanically coupled to the upper support rod 70 by being fixed to the connecting reinforcement 90.

In addition, the material of the secondary sealing wall 52 forming the corner structure 100 of the present invention is an aluminum sheet or a flexible sheet (Triplex) material, the corner secondary sealing wall 52 is the corner portion It is formed to protrude more than the cross-section of the primary insulating wall 51 and the corner secondary insulating wall 53 to be fastened to the neighboring secondary sealing wall 203 in a later process.

Referring to FIG. 6, which is a perspective view of a planar structure constituting the liquefied natural gas storage tank structure according to the present invention, the planar structure 200 constituting the present invention is preassembled from the outside of the hull into the hull. The planar structure 200 has a structure similar to that of the corner structure 100, and an upper plate 205 made of plywood material is installed on the planar primary insulation wall 204. .

That is, the flat plate secondary heat insulating wall lower plate 201 in contact with the bottom surface (1) or the partition wall (2) formed inside the hull is provided, the flat portion 2 of the polyurethane foam (Polyurethane Foam) material on the top surface The primary insulating wall 202 is attached, and the upper side is again attached with a flat secondary sealing wall 203 made of aluminum sheet or flexible sheet, and the polyurethane foam is again attached to the upper side. ) Is made of a structure to which the planar portion of the primary insulating wall 204 and the plywood upper plate 205 is attached.

In addition, the planar secondary insulation wall lower plate 201 and the secondary sealing wall 203 is slightly protruded from the side of the primary and secondary insulation walls 204 and 202, the neighboring planar structure 200 or later in the process The corner structure 100 is to be mutually fixed and fixed, the corner portion of the opposite surface in contact with the corner structure 100 is formed in a stepped shape cut in part to be assembled and fixed by the anchor structure 150 of the present invention. The height of the planar structure 200 of the present invention having such a structure is manufactured to be equal to the height of the neighboring corner structure 100.

FIG. 7 is a perspective view of a boundary jaw installed on an inner wall of the ship, FIG. 8 is a perspective view of a corner structure inserted into a boundary jaw of FIG. 7, FIG. 9 is a perspective view of fixing a corner structure of FIG. 8, and FIG. 10 is a corner structure of FIG. 9. 11 is a perspective view of an adjacent planar structure, FIG. 11 is a perspective view of fixing an anchor support rod after fixing the planar structure of FIG. 10, and FIG. 12 is an anchor secondary insulating wall and an anchor secondary sealing wall to the anchor support rod of FIG. 11. 13 is a perspective view of fixing a plurality of planar structures to the hull inner wall, Figure 14 is a perspective view of fixing the anchor portion secondary sealing wall shown in the planar structure of Figure 13, Figure 15 is a secondary anchor part of Figure 14 16 is a perspective view of the anchor portion primary insulation wall is inserted into the upper portion of the sealing wall, Figure 16 is a perspective view of fixing the anchor upper plate on the upper portion of the anchor portion primary insulation wall of Figure 15, Figure 17 is anchor insulation to the anchor portion primary insulation wall of Figure 16 A perspective view of the plate installed, Figure 18 is a heat insulating plate of Figure 17 Perspective view increases to lock the upper cup, Figure 19 is a perspective view showing a perspective view of the primary heat insulating material is filled is installed, and Fig. 20 is the primary sealing wall 19 in Fig.

Hereinafter, the liquefied natural gas storage tank structure according to the present invention and the process of installing such a tank structure will be described in detail with reference to FIGS. 7 to 20, and the series of assembling processes for liquefied natural gas storage of the present invention. It is a method of manufacturing a tank structure.

As shown in Figure 7 and 8, the liquefied natural gas storage tank structure according to the present invention is the bottom bottom surface (1) of the hull and the left and right or transverse bulkheads extending at a vertical or constant angle in the left and right or transverse direction thereof It is installed in (2).

First, the corner boundary jaw 80, 81, which can fix the corner structure 100, is fixed to the lower bottom part 1 and the partition wall 2. At this time, the method of fixing the corner boundary jaw (80,81) by the welding method is suitable, the distance from the corner is to be the minimum width length that can be inserted of the corner structure 100 is assembled. . As such, the corner structure 100 inserted between the corner boundary jaws 80 and 81 has a predetermined gap formed between the boundary jaws 80 and 81.

As described above, when the corner structure 100 is mounted between the boundary jaw (80, 81), the fixing base 101 is fixed to the boundary jaw (80, 81). At this time, the fixing method is to fix the bolts 101 to the boundary jaw (80,81). The fixing base 101 has a protrusion corresponding to the clearance between the boundary jaw 80 and 81 and the corner structure 100, so that the corner structure 100 and the boundary jaw 80 when fixing the fixing stand 101 are formed. 81 The play between the gaps is filled and flow is prevented. As such, the lower bottom surface 1 and the partition wall 2 and the corner structure 100 inside the hull are coupled by bonding, and secondly, the boundary structures 100 of the present invention are provided on the boundary jaw 80 and 81. Is fixed to be attached.

At the same time, the anchor base plate 110 of the anchor structure 150 for fixing the planar structure 200 which is continuously installed from the corner structure 100, the lower bottom portion 1 and the partition wall (2) Fix it to the surface at regular intervals. To this end, a group of stud pins 109 are installed on the inner surface of the hull at regular intervals. At this time, the stud pin 109 is processed to be inclined to the bottom surface (1) or the part in contact with the partition wall 2, and welded in a pressurized state, the stud pin 109 is welded to the inner wall surface of the hull do.

Next, an anchor base plate 110 having a through hole corresponding to the stud pin 109 is inserted into the stud pin 109 to the stud pin 109. At this time, the anchor base plate 110 is welded or bonded to the inner wall surface of the hull to be coupled. In addition, the anchor base plate 110 to match the thickness of the flat plate secondary insulating wall lower plate 201.

As described above, when the planar structure 200 is fixed, the anchor lower plate 111 is coupled to the upper portion of the anchor base plate 110 so as to cover the periphery of the planar secondary insulating wall lower plate 201. . To this end, the anchor lower plate 111 has a through hole formed at a position corresponding to the stud pin 109, and the anchor base plate is fastened to the stud pin 109 passing through the anchor lower plate 111. 110 is fixed.

As described above, the planar structure 200 is limited to the lower plate 201 by the fixing base 101 or the anchor base plate 201 in the upward movement.

Next, the anchor support rod 112 is vertically fixed to the center portion of the anchor lower plate 111.

To this end, a predetermined digging space is formed in the central portion of the anchor lower plate 111.

Meanwhile, a rod support cap (120 of FIG. 23) is installed in a hole space of the anchor lower plate 111 through a hole formed in the center of the anchor base plate 110. The rod support cap 120 has a nut included therein, or the nut structure is integrally formed, so that the above-described anchor support rod 112 is vertically coupled to the rod support cap 120.

Here, the anchor support rod 112 is heat transfer to the upper or lower, but in design to minimize the heat transfer from the LNG to the hull in consideration of the diameter of the anchor support rod 112 and the heat transfer rate to other parts It is preferable.

The anchor support rod 112 serves to primarily support the load generated from the primary sealing wall attached in a later process.

It is to fix each planar structure 200 around the anchor support rod 112 of the present invention by the fixing method as described above, if the position of the planar structure 200 is fixed, 12 and 13 As shown, while filling the space formed by the secondary insulating walls (53, 202) of the corner structure 100 and the planar structure 200 with a polyurethane foam insulation 211, the anchor support rod 112 Anchor portion secondary heat insulating wall 113 and anchor portion secondary sealing wall 114 is inserted into.

The anchor secondary insulation wall 113 is made of a polyurethane foam insulation and a plywood plate, the anchor portion secondary sealing wall 114 attached to the upper surface is an aluminum sheet or flexible It is made of a sheet material.

As described above, the LNG storage tank configured as described above increases the stress applied to the heat insulating material when the hull is deformed and the hull is deformed when the ship moves. Circular wrinkles 115 are formed in the anchor portion secondary sealing wall 114 in order to reduce the increase in stress in the heat insulating material.

When stress is generated in the hull for the above reason, the corner structure 100 is fixed, but each planar structure 200 is capable of sliding movement in the lateral direction when oscillation occurs. On the other hand, the pleats 115 are extended or contracted in the direction in which the planar structure 200 is slidably moved during the sliding movement of the planar structure 200 to prevent mechanical or thermal deformation applied to the insulation or the sealing wall.

As described above, the corner structure 100 of the present invention and each planar structure 200 are installed on the inner surface of the hull, and then the insulating material 211 of the polyurethane foam material is formed in the space formed by each secondary insulation wall After filling, each neighboring secondary sealing wall is connected and fixed by the fixing means.

That is, the secondary sealing wall 52 of the corner structure 100 and the secondary sealing wall 203 of the planar structure 200 adjacent thereto are fixed, and the neighboring secondary sealing wall of the planar structure 200 ( While fixing the 203 to each other, the secondary sealing wall 114 adjacent to the secondary sealing wall 203 of the planar structure 200 is to be fixed to each other.

Figure 21 is an enlarged cross-sectional view showing the means for fastening the secondary sealing wall in the LNG storage tank according to the present invention, Figure 22 is a cross-sectional view of the secondary sealing wall in the LNG storage tank according to the present invention An enlarged perspective view showing the fastening means.

Here, the fixing method is fixed by fixing means as shown in FIGS. 21 and 22, and this fixing method is applied to all of the secondary sealing walls of the present invention.

That is, as shown in FIG. 21 as an example, the space portion (ie, the heat insulation) formed by the corner portion primary and secondary insulation walls 51 and 53 and the planar portion primary and secondary insulation walls 204 and 202 of the present invention. The lower fixing plate 213 and the upper fixing plate 212 are positioned to face each other with the secondary sealing walls 52 and 203 interposed between the secondary sealing walls 52 and 203 protruding from each other. At this time, although not particularly limited, when the lower fixing plate 213 and the upper fixing plate 212 are fixed as the fixing bolts 214, the secondary sealing walls 52 and 203 are firmly fixed. Here, the lower fixing plate 213 and the upper fixing plate 212 use a metal material.

In addition, the lower fixing plate 213 and the upper fixing plate 212 connects and fixes the respective secondary sealing walls 52 and 203 in a curved form, which is the facing surface of each of the lower fixing plate 213 and the upper fixing plate 212. The addition is made possible by forming the curved surface uneven portions corresponding to each other. As such, the ends of the secondary sealing wall are connected in a curved shape, thereby improving the sealing property of the secondary sealing wall against the LNG leakage of the primary sealing wall, which may occur at any time.

In addition, the combination of the lower fixing plate 213 and the upper fixing plate 212 is preferably some length bend in the longitudinal direction, and have a certain length, and the storage tank is filled with liquefied natural gas, the temperature is lowered to thermal Even if it shrinks, the load due to mechanical / thermal shrinkage and expansion can be easily eliminated, such as providing room to absorb the stress.

In addition, as shown in FIG. 22, the lower fixing plate 213 and the upper fixing plate 212 connect and fix the respective secondary sealing walls 52 and 203, which are generated in the hull by the movement or current of the ship. According to the deformation, the secondary sealing walls 52 and 203 flexibly cope with mechanical deformation in the vertical direction rather than the horizontal direction.

In addition, the coupling structure of the secondary sealing wall can provide a degree of freedom to the insulating wall by combining the secondary sealing wall independently of each insulation wall and the hull, in particular deformation of the inner surface of the hull That is, it is possible to prevent damage to the insulating wall.

As described above, each secondary sealing wall is fixed by the fixing means. Next, the washer is inserted into and fastened to the anchor support rod 112 integrally with the washer. At this time, the washer of the nut is to maintain the upper portion of the heat insulating material pressed in a predetermined pressure. Here, after the LNG is stored in the storage tank of the ship, the volume of the heat insulating material, that is, the thickness is reduced by the expansion pressure of the LNG and the nut is the anchor support rod 112 in consideration of the reduced thickness of the heat insulating material in the design ) Is fastened.

Then, the anchor portion primary insulation wall 116 is inserted into the upper surface, and then the anchor upper plate 117 is inserted into the recess formed in the upper surface of the anchor portion primary insulation wall 116, The anchor insulation plate 118 is attached and fixed again, and a circular anchor upper cap 119 is inserted and fixed again in the center portion. To this end, a predetermined slotting space is formed in the upper center of the anchor insulation plate 118, and the anchor upper cap 119 is located in the space. The anchor upper cap 119 includes a nut, or the nut structure is integrally formed so as to be coupled to the upper end of the anchor support rod 112 to complete the assembly of the anchor structure 150.

Figure 23 is an enlarged partial cross-sectional perspective view showing the coupling relationship of the anchor structure in the liquefied natural gas storage tank structure according to the present invention, the anchor structure 150 according to the present invention assembled through a series of processes is shown in Figure 23 It will take a coupling structure as shown.

When the corner structure 100 and the planar structure 200 according to the present invention through the above assembly process is installed on the inner surface of the hull, and the anchor structure 150 is assembled, as shown in Figure 19, the corner structure The insulating material is filled in the space portion between the primary insulating walls 100 formed by the planar structure 200 and the anchor structure 150. In this case, glass wool is used as the insulating material to be filled in order to more flexibly respond to the thermal contraction of the primary insulating wall to more easily solve the thermal stress.

As described above, after filling the insulating material such as glass wool in the space of the primary insulating wall formed by each assembly structure, the membrane-type primary sealing wall 250 having a pleated portion 251 on the upper surface thereof. ) Will be fixed. The material of the primary sealing wall 250 is mainly made of a stainless steel material excellent in corrosion resistance and thermal stability.

In addition, the wrinkle portion 251 is formed in the longitudinal direction along the space portion formed by the respective assembly structure (100,150,200), a plurality of wrinkle portion 251 is formed in the periphery around the wrinkle portion 251 do. The wrinkle part 251 is intended to easily solve the thermal deformation in response to the elastic contraction and expansion of the primary sealing wall 250 is the most severe occurs in direct contact with the stored liquefied natural gas. In addition, the reason why the wrinkle part 251 is formed in the same length direction on the upper part of the space where each primary heat insulating wall is formed is dependent on the thermal contraction and expansion of the primary heat insulating wall and the secondary sealing wall attached thereto. Correspondingly, the thermal stress of the storage tank structure can be easily solved.

The present invention has been applied to the specific embodiments as shown in each of the above drawings, the present invention is not limited to these specific embodiments, but can be carried out in various modifications within the scope without departing from the spirit of the present invention. Do.

As described above, the present invention simplifies the installation structure of the storage tank installed inside the ship for transporting the liquid liquefied natural gas in the cryogenic state to shorten the assembly process and at the same time maintain the liquid tightness of the storage tank While reducing the stress on mechanical deformation due to the loading or unloading of the liquefied natural gas more easily has the effect of minimizing the loss due to the vaporization of the liquefied natural gas.

1 and 2 are a cross-sectional view and a perspective view of a conventional membrane type liquefied natural gas storage tank structure GTT NO 96-2 type;

3 and 4 are a cross-sectional view and a perspective view showing a GTT Mark III type of a conventional membrane type liquefied natural gas storage tank structure;

5 is a cross-sectional view showing the internal structure of the corner structure constituting the tank structure for liquefied natural gas storage according to the present invention;

6 is a perspective view of a planar structure constituting the liquefied natural gas storage tank structure according to the present invention;

7 to 20 are perspective views sequentially illustrating a process of assembling the liquefied natural gas storage tank structure in the hull inner space according to the present invention;

Figure 21 is an enlarged cross-sectional view showing the means for fastening the secondary sealing wall in the tank structure for liquefied natural gas storage according to the present invention;

Figure 22 is an enlarged perspective view showing the means for fastening the secondary sealing wall in the liquefied natural gas storage tank structure according to the present invention;

Figure 23 is a partial cross-sectional perspective view showing an enlarged coupling relationship of the anchor structure in the tank structure for liquefied natural gas storage according to the present invention.

♣ Explanation of symbols for main part of drawing ♣

50: corner support plate 51: corner portion primary insulation wall

52: corner secondary sealing wall 53: corner secondary insulating wall

54, 56 plate 57, 58: heat insulating material

60: lower support rod 61: rod support cap

70: upper support rod 80, 81: corner boundary jaw

90: connection reinforcement table 100: corner structure

101: holder 109: stud pin

110: anchor base plate 111: anchor lower plate

113: anchor portion secondary insulating wall 114: anchor portion secondary sealing wall

115: pleat 119: anchor upper cap

150: anchor structure 200: planar structure

201: lower plate 202: planar secondary insulation wall

203: plane portion secondary sealing wall 204: plane portion primary insulation wall

205: top plate 211: heat insulating material

212: upper fixing plate 213: lower fixing plate

214: fixing bolt 250: primary sealing wall

251: wrinkles

Claims (21)

A storage tank installed inside a hull of a vessel for storing liquefied natural gas, comprising two continuous sealing walls and two heat insulating walls, wherein the primary sealing wall is the liquefied natural gas stored in the storage tank and In the storage tank structure which is in contact with, and arranged in the order of the primary heat insulating wall, the secondary sealing wall and the secondary heat insulating wall, The primary sealing wall is supported by an anchor portion mechanically coupled to the hull, The insulating wall is a tank structure for liquefied natural gas storage, characterized in that the sliding installation between the primary wall and the inner wall surface of the hull. The method according to claim 1, The primary insulating wall and the secondary insulating wall is a tank structure for liquefied natural gas storage, characterized in that bonded to each of the upper and lower surfaces of the secondary sealing wall by an adhesive. The method according to claim 1 or 2, The secondary insulating wall is a tank structure for liquefied natural gas storage, characterized in that it comprises a polyurethane foam insulation and a plywood plate bonded to the lower surface thereof. The method according to claim 1 or 2, The primary insulating wall is a tank structure for liquefied natural gas storage, characterized in that it comprises a polyurethane foam insulation and a plywood plate bonded to the upper surface thereof. The method according to claim 1 or 2, The material of the secondary sealing wall is a tank structure for liquefied natural gas storage, characterized in that the aluminum sheet or flexible sheet (Triplex). The method according to claim 1 or 2, The secondary sealing wall is a tank structure for liquefied natural gas storage, characterized in that formed to protrude more than the cross-section of the primary insulating wall and the secondary insulating wall. The method according to claim 1 or 2, The primary sealing wall is a tank structure for liquefied natural gas storage, characterized in that the stainless material. The method according to claim 1 or 2, The primary sealing wall is a tank structure for liquefied natural gas storage, characterized in that the pleated portion is formed. The method according to claim 1 or 2, Liquefied natural gas storage tank structure, characterized in that the space formed between the secondary insulating wall is filled with a heat insulating material of polyurethane foam material. The method according to claim 1 or 2, Liquefied natural gas storage tank structure, characterized in that the space formed between the primary insulating wall is filled with a heat insulating material of glass wool (Glass Wool) material. The method according to claim 1 or 2, The secondary sealing wall is a tank structure for liquefied natural gas storage, characterized in that the connection by the lower fixing plate and the upper fixing plate located on the upper and lower portions of the secondary sealing wall protruding from the space formed by the secondary insulating wall. The method according to claim 11, The lower fixing plate and the upper fixing plate is a tank structure for liquefied natural gas storage, characterized in that for fixing the secondary sealing wall connected in a curved form. The method according to claim 1 or 2, Corner structure coupled to the edge portion of the hull, A planar structure slidably positioned on a plane inside the hull; Liquefied natural gas storage tank structure characterized in that it comprises an anchor structure coupled to the hull to attach the planar structure to the hull. The method according to claim 13, The planar structure is one side is fixed by the corner boundary jaw that the corner structure is fixed, the planar portion secondary insulation wall is installed at the same height as the corner secondary insulation wall, and the planar portion formed on the upper surface Liquefied natural gas storage tank structure, characterized in that the secondary sealing wall and the pre-assembly is installed in the planar portion primary insulating wall formed on the upper surface thereof. The method according to claim 13, The anchor structure includes an anchor rod fixed to an anchor lower plate that is mechanically fixed to a corner portion where the planar structure meets, and an anchor portion 2 inserted into and fixed to the anchor rod so as to be installed at the same height as the planar secondary insulation wall. A secondary heat insulating wall and an anchor portion secondary sealing wall mechanically engaged with a neighboring flat portion secondary sealing wall while a center is inserted into the anchor rod and fixed to an upper surface of the anchor secondary insulating wall; And an upper cap fixed to an upper portion of the anchor rod, which is a central portion of the anchor portion and is fixed to the upper surface of the anchor secondary seal wall, and the upper portion of the upper portion of the anchor primary insulation wall. Tank structure for liquefied natural gas storage. The method according to claim 13, The corner structure is a corner portion secondary heat insulating wall formed in the L shape to be interviewed at the corner point where the surface formed in the hull of the ship, respectively, corner corner secondary sealing wall formed on the upper surface thereof and the upper surface thereof The corner part primary insulation wall is formed, and the upper surface of the corner portion primary insulation wall is made of a pre-assembly is further provided with an L-shaped corner support plate is installed on the inner surface of the hull of the ship to receive the asymmetrical load of the storage tank Tank structure for liquefied natural gas storage, characterized in that fixed by the formed corner boundary jaw. A storage tank installed inside a hull of a vessel for storing liquefied natural gas, comprising two continuous sealing walls and two heat insulating walls, wherein the primary sealing wall is the liquefied natural gas stored in the storage tank and In the method of manufacturing a storage tank in contact with, and arranged in the order of the primary insulating wall, the secondary sealing wall and the secondary insulating wall, Forming boundary jaws at corner portions formed in the hull of the ship, and fixing and fixing anchor base plates on the inner surface of the ship at predetermined intervals; Attaching and fixing a corner structure pre-assembled with a secondary heat insulation wall, a secondary sealing wall, a primary heat insulation wall, and a corner support plate, based on the formed corner boundary jaw; Fixing the fixed corner structure to the corner boundary jaw as a fixing stand, and fixing the anchor lower plate on the anchor base plate and vertically fixing the anchor support rod in the center thereof; One side of the flat structure pre-assembled with the secondary heat insulation wall, the secondary sealing wall, and the primary heat insulation wall is fixed to one side of the fixing station to which the corner structure is fixed, and the other edge portion of the flat structure is the anchor base plate and the Inserting and fixing the space formed by the anchor lower plate; Filling a space formed by the secondary insulating wall of the corner structure and the planar structure with a heat insulating material, and inserting the anchor part secondary heat insulating wall and the anchor part secondary sealing wall into the anchor supporting rod; Fixing the secondary sealing wall of the corner structure and the secondary sealing wall of the planar structure adjacent thereto, fixing the secondary sealing wall of the planar structure to each other, and simultaneously adjoining the secondary sealing wall of the planar structure. Fixing the anchor portion secondary sealing wall to each other; Inserting an anchor portion primary insulation wall into the anchor support rod, and then fixing and fixing the anchor top plate and the anchor insulation plate and attaching and fixing the anchor upper cap to the end of the anchor support rod to complete the assembly of the anchor structure; Filling the spaces between the primary insulation walls formed by the corner structures, the planar structures, and the anchor structures with insulation; And attaching and fixing a primary sealing wall having corrugations on the upper surfaces of the corner structure, the planar structure, and the anchor structure. The method according to claim 17, Fixing the anchor lower plate on the upper portion of the anchor base plate and vertically fixing the anchor support rod in the center portion is fixed by fixing the anchor support rod bolted to the rod support cap fixed to the center portion of the anchor lower plate bolted to the anchor base plate Method for producing a liquefied natural gas storage tank, characterized in that. The method according to claim 17 or 18, Filling the space formed by the secondary insulating wall of the corner structure and the planar structure with a heat insulating material is a method of manufacturing a tank for liquefied natural gas storage, characterized in that the filling of polyurethane foam as a heat insulating material. The method according to claim 17 or 18, Fixing the secondary sealing wall of the corner structure and the secondary sealing wall of the planar structure adjacent thereto, fixing the secondary sealing wall of the planar structure to each other, and simultaneously adjoining the secondary sealing wall of the planar structure. The fixing of the anchor portion secondary sealing wall to each other is characterized in that for fixing the lower fixing plate positioned below the secondary sealing wall and the upper fixing plate positioned to face the upper surface thereof by bolting. Method of manufacturing a tank. The method according to claim 17 or 18, Fixing the secondary sealing wall of the corner structure and the secondary sealing wall of the planar structure adjacent thereto, fixing the secondary sealing wall of the planar structure to each other, and simultaneously adjoining the secondary sealing wall of the planar structure. The fixing of the anchor portion secondary sealing wall to each other is a liquefaction, characterized in that fixed by the curved surface portion formed on the lower fixing plate for bolting the secondary sealing wall and the upper fixing plate positioned to face the upper surface thereof. Method of producing a tank for storing natural gas.