Insulation member, liquefied gas storage tank and ship

Abstract

An insulating member according to one aspect of the present invention comprises: an insulating wall; and an insulating layer installed on the outside of the insulating wall; wherein the insulating layer comprises: an insulating portion; and a cover portion covering at least a portion of the side of the insulating portion; and wherein the cover portion may include a first cover portion covering one side of the insulating portion; and a second cover portion covering the other side of the insulating portion.

Description

Technology Field

[0001] The present invention relates to an insulating member, a liquefied gas storage tank, and a ship. Background Technology

[0002] Due to recent technological developments, liquefied gases such as Liquefied Natural Gas (LNG) and Liquefied Petroleum Gas (LPG) are being widely used to replace gasoline and diesel.

[0003] Recently, with the increasing demand for eco-friendly and high-efficiency engines due to stricter IMO environmental regulations, research on propulsion systems using various fuels is actively underway, and among them, ammonia is attracting attention as an eco-friendly fuel because it does not contain carbon.

[0004] Meanwhile, on ships such as RVs (Regasification Vessels), FPSOs (Floating, Production, Storage and Offloading), and FSRUs (Floating Storage and Regasification Units), storage tanks (referred to as "cargo tanks") are installed to store liquefied gases, such as LNG, in a cryogenic liquid state.

[0005] Liquefied gas storage tanks are classified into independent type and membrane type depending on whether they support the load of the cargo themselves.

[0006] A membrane-type storage tank may be composed of a barrier member that is in direct contact with the liquefied gas to maintain cryogenic temperatures, and an insulating member made of a material with low thermal conductivity and installed on the outer side of the barrier.

[0007] For example, a membrane-type storage tank in which LNG is stored includes, in order to prevent the evaporation of LNG having a boiling point of -163℃, a primary barrier that is in direct contact with the LNG, a primary insulation member installed on the outer side of the primary barrier, a secondary barrier installed on the outer side of the primary insulation member, and a secondary insulation member installed on the outer side of the secondary barrier.

[0008] As such, membrane-type storage tanks in which LNG is stored are composed of two layers of insulation (barriers and insulation layers) to provide insulation performance capable of storing LNG. However, in storage tanks in which ammonia, which has a boiling point of -34°C, is stored, the insulation performance derived from these two layers of barriers and two layers of insulation is not required.

[0009] In addition, ammonia has a density of approximately 680 kg / m³. 3 Therefore, LNG has a density of approximately 450 kg / m³ 3 Therefore, the impact of sloshing on ammonia is greater than that on LNG. Thus, in terms of structural stability, it may be advantageous for membrane-type storage tanks where ammonia is stored to have a single layer of insulation. The problem to be solved

[0010] The present invention was created to solve the problems of the prior art described above, and aims to provide an insulating member having structural stability and thermal insulation performance optimized for the storage of ammonia.

[0011] In addition, the purpose is to provide a liquefied gas storage tank that has structural stability and thermal insulation performance optimized for the storage of ammonia, with the insulating material composed of a single layer. means of solving the problem

[0012] An insulating member according to one aspect of the present invention comprises: an insulating wall; and an insulating layer installed on the outside of the insulating wall; wherein the insulating layer comprises: an insulating portion; and a cover portion covering at least a portion of the side of the insulating portion; and wherein the cover portion may include a first cover portion covering one side of the insulating portion; and a second cover portion covering the other side of the insulating portion.

[0013] Specifically, the first cover portion and the second cover portion may be positioned at different heights.

[0014] Specifically, the insulation layer is arranged adjacently in multiple places and a slit is formed, and the first cover portion and the second cover portion can be arranged vertically in the slit.

[0015] Specifically, the insulation layer may be formed from at least one insulating material selected from expanded plastic beads, polyurethane, polystyrene, polyethylene, polypropylene, polyisocyanurate, polymer foam, aerogel blanket, aerogel powder, fumed silica, calcium silicate, mineral wool, glass wool, glass microfiber, perlite, and hollow microspheres.

[0016] Specifically, the insulation layer can be formed from a high-density polymer foam.

[0017] Specifically, the insulation wall may be formed from at least one of a foam composite, plywood, a polymer composite, and a sandwich composite.

[0018] A liquefied gas storage tank according to one aspect of the present invention comprises: an insulating barrier in contact with liquefied gas; an insulating member installed on the outer side of the insulating barrier; and an insulating panel installed on the outer side of the insulating member; wherein the insulating member comprises: an insulating wall; and an insulating layer installed on the outer side of the insulating wall; and wherein the insulating layer comprises: an insulating portion; and a cover portion covering at least a portion of the side of the insulating portion; and wherein the cover portion may comprise: a first cover portion covering one side of the insulating portion; and a second cover portion covering the other side of the insulating portion.

[0019] Specifically, the above-mentioned thermal barrier may have a thickness of 2.0 mm or less.

[0020] Specifically, the above-mentioned thermal barrier may be composed of cold-rolled steel sheets.

[0021] Specifically, the insulation member and the insulation panel can be combined with each other.

[0022] Specifically, the insulation layer may be formed from at least one insulating material selected from expanded plastic beads, polyurethane, polystyrene, polyethylene, polypropylene, polyisocyanurate, polymer foam, aerogel blanket, aerogel powder, fumed silica, calcium silicate, mineral wool, glass wool, glass microfiber, perlite, and hollow microspheres.

[0023] Specifically, at least one of the insulation wall and the insulation panel may be formed from at least one of a foam composite, plywood, a polymer composite, and a sandwich composite.

[0024] Specifically, the above liquefied gas may be liquefied ammonia.

[0025] A vessel according to one aspect of the present invention may include a liquefied gas storage tank. Effects of the invention

[0026] The insulating member according to the present invention can exhibit sufficient thermal insulation performance and mechanical strength to store ammonia.

[0027] The liquefied gas storage tank according to the present invention includes a single layer of insulating material, so it can exhibit sufficient thermal insulation performance and mechanical strength to store ammonia while reducing the installation cost of the insulating material.

[0028] The effects of the present invention are not limited to those mentioned above, and other unmentioned effects will be clearly understood by those skilled in the art from the description in the claims. Brief explanation of the drawing

[0029] FIG. 1 is a side view of a ship equipped with a liquefied gas storage tank according to one embodiment of the present invention. FIG. 2 is a cross-sectional perspective view of a liquefied gas storage tank according to one embodiment of the present invention. FIG. 3 is a front view of a liquefied gas storage tank according to one embodiment of the present invention. FIG. 4 is a partially exploded perspective view of a liquefied gas storage tank according to the first embodiment of the present invention. FIG. 5 is a partial perspective view of a liquefied gas storage tank according to a first embodiment of the present invention. FIG. 6 is a partial perspective view of an insulating member installed in a liquefied gas storage tank according to a first embodiment of the present invention. FIG. 7 is a partial cross-sectional view of a liquefied gas storage tank according to a first embodiment of the present invention. FIG. 8 is a partial cross-sectional view of an insulating barrier according to one embodiment of the present invention. FIG. 9 is an enlarged view of an insulating barrier according to one embodiment of the present invention. FIG. 10 is a partial cross-sectional view of a right-angle corner portion of a liquefied gas storage tank according to the first embodiment of the present invention. FIG. 11 is a partially exploded perspective view of a corner member according to one embodiment of the present invention. FIG. 12 is a partial cross-sectional view of an obtuse corner portion of a liquefied gas storage tank according to a first embodiment of the present invention. FIG. 13 is a partial cross-sectional view of a right-angle corner portion of a liquefied gas storage tank according to a second embodiment of the present invention. FIG. 14 is a partial cross-sectional view of an obtuse corner portion of a liquefied gas storage tank according to a second embodiment of the present invention. FIG. 15 is a partial perspective view of an insulating member installed in a liquefied gas storage tank according to a third embodiment of the present invention. FIG. 16 is a partial cross-sectional view of a liquefied gas storage tank according to a third embodiment of the present invention. FIG. 17 is a partial cross-sectional view of a right-angle corner portion of a liquefied gas storage tank according to a third embodiment of the present invention. FIG. 18 is a partial cross-sectional view of an obtuse corner portion of a liquefied gas storage tank according to a third embodiment of the present invention. FIG. 19 is a partial cross-sectional view of a right-angle corner portion of a liquefied gas storage tank according to the fourth embodiment of the present invention. FIG. 20 is a partial cross-sectional view of an obtuse corner portion of a liquefied gas storage tank according to the fourth embodiment of the present invention. FIG. 21 is a partial perspective view of an insulating member installed in a liquefied gas storage tank according to the fifth embodiment of the present invention. FIG. 22(a) is a partial perspective view of a lower insulation block installed in a liquefied gas storage tank according to the fifth embodiment of the present invention, and FIG. 22(b) is a partial perspective view of an upper insulation block installed in a liquefied gas storage tank according to the fifth embodiment of the present invention. FIG. 23 is a partial cross-sectional view of a liquefied gas storage tank according to the fifth embodiment of the present invention. FIG. 24 is a partial cross-sectional view of a right-angle corner portion of a liquefied gas storage tank according to the fifth embodiment of the present invention. FIG. 25 is a partial cross-sectional view of an obtuse corner portion of a liquefied gas storage tank according to the fifth embodiment of the present invention. FIG. 26 is a partial cross-sectional view of a right-angle corner portion of a liquefied gas storage tank according to the 6th embodiment of the present invention. FIG. 27 is a partial cross-sectional view of an obtuse corner portion of a liquefied gas storage tank according to the 6th embodiment of the present invention. FIG. 28 is a partial cross-sectional view of a right-angle corner portion of a liquefied gas storage tank according to the seventh embodiment of the present invention. FIG. 29 is a partial cross-sectional view of an obtuse corner portion of a liquefied gas storage tank according to the seventh embodiment of the present invention. FIG. 30 is a partial cross-sectional view of a right-angle corner portion of a liquefied gas storage tank according to the eighth embodiment of the present invention. FIG. 31 is a partial cross-sectional view of an obtuse corner portion of a liquefied gas storage tank according to the eighth embodiment of the present invention. FIG. 32 is an exploded perspective view of an insulating member installed in a liquefied gas storage tank according to the ninth embodiment of the present invention. Specific details for implementing the invention

[0030] The objects, specific advantages, and novel features of the present invention will become more apparent from the following detailed description and preferred embodiments in conjunction with the accompanying drawings. It should be noted that in assigning reference numerals to the components of each drawing in this specification, identical components are assigned the same number whenever possible, even if they are shown in different drawings. Furthermore, in describing the present invention, detailed descriptions of related prior art are omitted if it is determined that such detailed descriptions would unnecessarily obscure the essence of the invention.

[0031] Furthermore, it should be noted that the term "prior" in this invention is merely a comparative example to explain the features of the invention and does not necessarily imply that the content is publicly known.

[0032] Additionally, terms including ordinal numbers, such as first, second, etc., may be used to describe various components, but said components are not limited by said terms. These terms are used solely for the purpose of distinguishing one component from another.

[0033] In this specification, a liquefied gas storage tank may be a tank for storing cargo. The cargo may be a standardized object or substance, or a container, etc. Alternatively, the cargo may be a gas, which is a substance transported in a liquid state with a boiling point lower than room temperature, such as LNG, LPG, ethane, methanol, ammonia, hydrogen, CO2, etc.

[0034] Liquefied gas storage tanks may be provided on a vessel. In this specification, the vessel may be a merchant vessel that carries various types of cargo. Furthermore, the concept of a vessel includes not only merchant vessels that carry cargo, but also cruise ships that transport people, FSRUs that are moored and operate in a certain area, FPSOs, bunkering vessels, offshore plants, etc. In other words, the types of vessels in this invention are not limited.

[0036] FIG. 1 is a side view of a ship equipped with a liquefied gas storage tank according to one embodiment of the present invention.

[0037] Referring to FIG. 1, a liquefied gas storage tank (10) according to the first embodiment of the present invention is provided on a ship (1) and can store cryogenic liquefied gas. It should be noted that in the present invention, the liquefied gas storage tank (10) includes any type of tank for storing liquefied gas.

[0038] For example, the liquefied gas storage tank (10) may be of the membrane type in which the bulkhead structure of the ship (1) forms the outer surface of the tank, or it may be of the independent type in which the liquefied gas storage tank (10) is installed in the internal space of the ship (1).

[0039] The liquefied gas storage tank (10) may have a structure in which an insulating layer is arranged in the inner direction. The liquefied gas storage tank (10) has a storage space. Liquefied gas may be stored in the storage space, and for example, the liquefied gas may be ammonia. Although the following description assumes that the liquefied gas is ammonia, in addition to ammonia, the liquefied gas in the present invention may include all substances (LNG, LPG, ethane, hydrogen, etc.) that have a boiling point lower than room temperature, are forcibly liquefied for storage, and have a calorific value.

[0040] A liquefied gas storage tank (10) may form a closed space surrounded by a wall (100). However, for the inflow and outflow of liquefied gas, a dome (not shown) is installed on the upper surface of the wall (100). That is, the liquefied gas storage tank (10) may include a wall (100) and a dome (not shown).

[0041] FIG. 2 is a cross-sectional perspective view of a liquefied gas storage tank according to one embodiment of the present invention. FIG. 3 is a front view of a liquefied gas storage tank according to one embodiment of the present invention.

[0042] Referring to FIG. 2, the liquefied gas storage tank (10) is composed of a wall (100), and the wall (100) forms a storage space (170) for accommodating liquefied gas and also forms an insulating space. Specifically, the wall (100) has an insulating barrier (2), an insulating member (3), and an insulating panel (4) in the direction from the inside to the outside of the liquefied gas storage tank (10). For reference, in this specification, the inside refers to the direction facing the interior of the space where the liquefied gas is stored, and the outside refers to the opposite direction.

[0043] Referring to FIGS. 2 and 3, the wall (100) may include a side surface (110a, 110b), a bottom surface (120), a top surface (130), a back surface (140), a front surface (150), and a corner surface (160). A storage space (170) may be formed by the side surface (110a, 110b), bottom surface (120), top surface (130), back surface (140), front surface (150), and corner surface (160). Each of the side surface (110a, 110b) and the corner surface (160) may be formed in multiple numbers so that the multiple surfaces may face each other. The corner surface (160) may have an angle of 135° with any one of the adjacent side surface (110a, 110b), bottom surface (120), and top surface (130). The back surface (140) or the front surface (150) may have a 90° angle with any one of the side surface (110a, 110b), bottom surface (120), top surface (130) and corner surface (160).

[0044] Referring to FIG. 3, the liquefied gas storage tank (10) may be configured to include an insulating barrier (2) in contact with the liquefied gas, an insulating member (3) installed on the outside of the insulating barrier (2), and an insulating panel (4) installed on the outside of the insulating member (3). The liquefied gas storage tank (10) may be supported on the hull (6) by a mastic (5) installed between the insulating panel (4) and the hull (6).

[0045] Although the insulation panel (4) is described as a member provided on the outer side of the insulation member (3), the insulation panel (4) may be included in the insulation member (3). That is, the insulation member (3) may be composed of an insulation wall (31), an insulation layer (32) provided on the outer side of the insulation wall (31), and an insulation panel (4) provided on the outer side of the insulation layer (32). The insulation wall (31) may be connected to the insulation barrier (2) to fix the insulation barrier (2). The insulation panel (4) is joined to the hull (6) by a mastic (5), and the insulation panel (4) can maintain flatness even under the sloshing load of liquefied gas. In addition, the insulation panel (4) can absorb the load transmitted to the insulation layer (32) due to the relative movement of the hull (6).

[0046] The hull (6) may include an inner hull plate (6a) disposed on the outer side of the insulation panel (4) and an outer hull plate (6b) disposed on the outer side of the inner hull plate (6a). A girder is provided between the inner hull plate (6a) and the outer hull plate (6b), and the girder can support the inner hull plate (6a) as a longitudinal strength member of the vessel (1). The inner hull plate (6a) and the outer hull plate (6b) may be spaced apart by the girder. Between the inner hull plate (6a) and the outer hull plate (6b), a horizontal member extending vertically from the girder and a reinforcing member extending from one side of the inner hull plate (6a) and the outer hull plate (6b) may be included. The horizontal member may be a frame, and the reinforcing member may be a stiffener or a stringer. However, the present invention is not limited by the horizontal member and the reinforcing member.

[0047] The thermal insulation barrier (2) can prevent liquefied gas from leaking out together with the hull (6). Specifically, the thermal insulation barrier (2) can prevent liquefied gas from leaking out together with the inner hull plate (6a).

[0049] FIG. 4 is a partially exploded perspective view of a liquefied gas storage tank according to the first embodiment of the present invention.

[0050] Referring to FIG. 4, the liquefied gas storage tank (10) has a storage space (170) formed by a wall (100), and the wall (100) may have a stacked structure of an insulating barrier (2), an insulating member (3), and an insulating panel (4) from the inside to the outside of the liquefied gas storage tank (10). The liquefied gas storage tank (10) may be supported on the hull (6) by a mastic (5) installed between the insulating panel (4) and the hull (6).

[0051] The thermal insulation barrier (2) forms a receiving space for accommodating liquefied gas, which is a cryogenic material, and may be made of a metal material. For example, the metal material may be stainless steel, but is not limited thereto.

[0052] The thermal insulation barrier (2) can be fixedly connected to the upper part of the thermal insulation member (3) by an anchor strip (not shown) and installed so as to be in direct contact with the liquefied gas, which is a cryogenic material stored in the liquefied gas storage tank (10).

[0053] The thermal insulation barrier (2) may be formed from a corrugation membrane sheet made of stainless steel. For example, the thermal insulation barrier (2) may have a thickness of 2.0 mm or less. The thermal insulation barrier (2) may be formed with a thickness of 1.0 to 1.2 mm.

[0054] The corrugation shape of the corrugation membrane sheet may have different curvatures in the portion extending upward from the plane in contact with the insulating member (3) and in the portion where the direction changes back to the lower surface from the portion extending upward. Additionally, the corrugation shape may consist of large corrugations and small corrugations of different sizes, or all may be of the same size. The present invention is not limited by such corrugation shapes.

[0055] The insulating member (3) is designed to block heat intrusion from the outside and withstand impact from the outside or impact caused by liquefied gas sloshing from the inside, and can be installed between the insulating barrier (2) and the insulating panel (4).

[0056] The insulating member (3) may have a structure in which an insulating wall (31) and an insulating layer (32) are sequentially stacked on the outside of the insulating barrier (2). The thickness of the insulating member (3) may correspond to the combined thickness of the insulating wall (31) and the insulating layer (32). The thickness of the insulating member (3) may correspond to the combined thickness of the insulating wall (31), the insulating layer (32), and the insulating panel (4).

[0057] The insulation wall (31) can be installed between the insulation barrier (2) and the insulation layer (32). The insulation wall (31) can be formed from at least one of a foam composite such as polyurethane foam (PUF), reinforced polyurethane foam (R-PUF), or expanded polypropylene foam (EPP Foam), a polymer composite manufactured by mixing various fibers or organic / inorganic additives with plywood or a polymer resin, or a sandwich composite manufactured by laminating outer layers on both sides of a core. For example, the sandwich composite may be in the form of glass fiber reinforced polyurethane foam (R-PUF) filled between panels composed of plywood and a glass fiber reinforced composite. For example, the polymer composite may be GMT (Glass mat reinforced thermoplastics) or FRP (Fiber-reinforced plastic).

[0058] The insulation layer (32) can be formed between the insulation wall (31) and the insulation panel (4).

[0059] The insulation layer (32) is made of an insulating material and may include an insulating part (321) having a surface facing the insulating wall (31) and a cover part (322) covering at least a portion of the side of the insulating part (321).

[0060] The insulating part (321) may be formed from one or more insulating materials selected from expanded plastic beads, polyurethane, polystyrene, polyethylene, polypropylene, polyisocyanurate, polymer foam, aerogel blanket, aerogel powder, fumed silica, calcium silicate, mineral wool, glass wool, glass microfiber, perlite, and hollow microspheres. (The insulating layer

[0061] Specifically, the polymer foam may include foam-type insulation materials such as polyurethane foam, polystyrene foam, polyethylene foam, and polypropylene foam. The hollow microsphere may include glass bubbles from 3M. Additionally, the insulation part (321) may be replaced with a vacuum insulation panel (VIP).

[0063] The cover portion (322) may be formed from one or more insulating materials selected from expanded plastic beads, polyurethane, polystyrene, polyethylene, polypropylene, polyisocyanurate, polymer foam, aerogel blanket, aerogel powder, fumed silica, calcium silicate, mineral wool, glass wool, glass microfiber, perlite, and hollow microspheres.

[0064] Specifically, the polymer foam may include foam-type insulation materials such as polyurethane foam, polystyrene foam, polyethylene foam, and polypropylene foam. The hollow microsphere may include 3M's glass bubbles. Additionally, the cover portion (322) may be replaced with a vacuum insulation panel (VIP).

[0065] The insulation layer (32) may be composed of multiple layers. For example, the insulation layer (32) may include a first insulation layer (3211, 3221) stacked on the outside of the insulation wall (31) and a second insulation layer (3212, 3222) stacked on the outside of the first insulation layer (3211, 3221). The first insulation layer (3211, 3221) may include a first insulation part (3211) and a first cover part (3221), and the second insulation layer (3212, 3222) may include a second insulation part (3212) and a second cover part (3222).

[0066] At least a portion of the side of the first insulation part (3211) may be covered by the first cover part (3221). At least a portion of the side of the second insulation part (3212) may be covered by the second cover part (3222). The surfaces covered by the first cover part (3221) and the second cover part (3222) may be different from each other. For example, the first insulation part (3211) may have a cuboid shape and have four sides. In this case, the first cover part (3221) may cover two sides (a side in the +X direction and a side in the +Y direction) of the first insulation part (3211), and the second cover part (3222) may cover two sides (a side in the -X direction and a side in the -Y direction) different from the sides covered by the first cover part (3221).

[0067] The insulation panel (4) can be laminated between the hull (6) and the insulation layer (32). The insulation panel (4) can be formed from at least one of a foam composite such as polyurethane foam (PUF), reinforced polyurethane foam (R-PUF), or expanded polypropylene foam (EPP Foam), a polymer composite manufactured by mixing various fibers or organic / inorganic additives with plywood or a polymer resin, or a sandwich composite manufactured by laminating outer layers on both sides of a core. For example, the sandwich composite may be in the form of glass fiber reinforced polyurethane foam (R-PUF) filled between panels composed of plywood and a glass fiber reinforced composite. For example, the polymer composite may be GMT (Glass mat reinforced thermoplastics) or FRP (Fiber-reinforced plastic).

[0068] FIG. 5 is a partial perspective view of a liquefied gas storage tank according to a first embodiment of the present invention.

[0069] Referring to FIG. 5, a plurality of insulation layers (32) may be arranged adjacently in the horizontal direction. A plurality of insulation layers (32) may be arranged in the longitudinal and transverse directions of the vessel (1).

[0070] A cross-shaped anchor strip (33) that crosses the center of the panel may be installed on the upper surface of the insulation wall (31). The anchor strip (33) is a thin strip-shaped metal plate configured to fix the insulation barrier (2) to the upper surface of the insulation wall (31) by welding.

[0071] A cross-shaped groove corresponding to the shape of the anchor strip (33) may be machined into the insulation wall (31) so that the anchor strip (33) can be seated thereon, and the anchor strip (33) may be seated in the groove formed on the upper surface of the insulation wall (31) and fixed by a mechanical fastening method such as a screw, rivet, or staple. The upper surface of the anchor strip (33) after fixing is formed in the same plane as the upper surface of the insulation wall (31) where the groove is not formed.

[0072] The anchor strip (33) can be partially severed at the portion corresponding to the gap between adjacent insulation walls (31).

[0073] FIG. 6 is a partial perspective view of an insulating member installed in a liquefied gas storage tank according to a first embodiment of the present invention.

[0074] FIG. 7 is a partial cross-sectional view of a liquefied gas storage tank according to a first embodiment of the present invention.

[0075] Referring to FIG. 6, the insulating member (3) may have a structure in which an insulating wall (31) and an insulating layer (32) are stacked from the inside to the outside of the liquefied gas storage tank (10). Although not shown in the drawing, an insulating panel (4) may be placed on the outside of the insulating layer (32). The insulating member (3) may include the insulating wall (31), the insulating layer (32), and the insulating panel (4).

[0076] Referring to FIG. 7, the liquefied gas storage tank (10) may have a stacked structure of an insulating barrier (2), an insulating member (3), and an insulating panel (4) from the inside outward direction. The liquefied gas storage tank (10) may be supported on the hull (6) by a mastic (5) installed between the insulating panel (4) and the hull (6).

[0077] Referring to FIG. 7, the insulating member (3) and the insulating panel (4) can form a single block. Specifically, the insulating member (3) may have a structure in which an insulating wall (31) and an insulating layer (32) are stacked from the inside to the outside of the liquefied gas storage tank (10), and an insulating panel (4) may be stacked in the outside direction of the insulating layer (32). The insulating layer (32) and the insulating wall (31), and the insulating layer (32) and the insulating panel (4) may be combined with each other to form a single block. For example, the insulating layer (32) and the insulating wall (31) may be bonded with an adhesive, and the insulating layer (32) and the insulating panel (4) may be bonded with an adhesive. The present invention is not limited by the method of combining the insulating layer (32), the insulating wall (31), and the insulating panel (4).

[0079] A plurality of insulating members (3) may be arranged adjacent to each other. At this time, a first slit (SL1) may be formed between adjacent insulating members (3). Additionally, the insulating member (3) may include a second slit (SL2) formed by penetrating the insulating wall (31) and the insulating layer (32). The slit (SL) may be provided to mitigate the phenomenon of thermal load concentration in the insulating member (3). The second slit (SL2) may be formed after the insulating wall (31) and the insulating layer (32) are joined in the insulating member (3). The first slit (SL1) and the second slit (SL2) may have the same thickness and height as the insulating member (3), or may be formed thinner than the thickness of the insulating member (3), but the present invention is not limited thereto. An insulating material may be inserted into the first slit (SL1) and the second slit (SL2). The first slit (SL1) and the second slit (SL2) may be formed by penetrating at least a portion of the insulating member (3). The first slit (SL1) and the second slit (SL2) may include a shape that passes through the entire insulating member (3) and a shape that passes through a portion of the insulating member (3), and the first slit (SL1) and the second slit (SL2) are not limited by their shapes.

[0080] The insulation layer (32) may include an insulation portion (321) composed of an insulating material and a cover portion (322) covering the outer side of the insulation portion (321). The cover portion (322) may include a first cover portion (3221) disposed adjacent to the insulation wall (31) and a second cover portion (3222) stacked on the outer side of the first cover portion (3221).

[0081] Referring to FIGS. 4 and 7, the first cover portion (3221) may cover the upper side of the insulation portion (321), and the second cover portion (3222) may cover the lower side of the insulation portion (321). At this time, the first cover portion (3221) may cover a portion of the side of the insulation portion (321), and the second cover portion (3222) may cover a portion of the side of the insulation portion (321). The side of the insulation portion (321) covered by the first cover portion (3221) and the side of the insulation portion (321) covered by the second cover portion (3222) may have different directions.

[0082] Referring to FIG. 4, the first cover portion (3221) and the second cover portion (3222) can cover two adjacent sides of the insulation portion (321). For example, the first cover portion (3221) can cover two adjacent sides (a side in the +X direction and a side in the +Y direction) of the insulation portion (321), and the second cover portion (3222) can cover two adjacent sides (a side in the -X direction and a side in the -Y direction) of the insulation portion (321).

[0083] At this time, the first cover portion (3221) and the second cover portion (3222) can fill the first slit (SL1) formed between adjacent insulating members (3). Specifically, a plurality of insulating members (3) may be arranged adjacent to each other, and the first cover portion (3221) and the second cover portion (3222) may be inserted into the first slit (SL1) formed between the adjacent insulating members (3). The first cover portion (3221) and the second cover portion (3222) may be stacked. The first cover portion (3221) may be positioned above the second cover portion (3222). The first cover portion (3221) and the second cover portion (3222) may be combined. For example, an adhesive may be applied to the lower surface of the first cover portion (3221) or the upper surface of the second cover portion (3222).

[0084] The first cover portion (3221) and the second cover portion (3222) are arranged adjacently with an insulating member (3) and can fill the slit (SL1) formed between the insulating members (3). A separate process for filling the slit (SL1) can be omitted. Additionally, the first cover portion (3221) and the second cover portion (3222) can double the heat transferred from the outside to the inside.

[0085] FIG. 8 is a partial cross-sectional view of an insulating barrier according to one embodiment of the present invention.

[0086] FIG. 9 is an enlarged view of an insulating barrier according to one embodiment of the present invention.

[0087] Referring to FIG. 8, the thermal insulation barrier (2) may be formed by arranging a plurality of thermal insulation barriers (2) adjacently and overlapping the thermal insulation barriers (2) to form a plurality of layers. Specifically, the thermal insulation barrier (2) may include a first thermal insulation barrier (21) and a second thermal insulation barrier (22) laminated on the lower surface of the first thermal insulation barrier (21). An anchor strip (33) may be laminated on the lower surface of the second thermal insulation barrier (22). The anchor strip (33) may be fixed to the thermal insulation barrier (31) by a fastening member (34), such as a rivet.

[0088] The first thermal insulation barrier (21), the second thermal insulation barrier (22), and the second thermal insulation barrier (22) and the anchor strip (33) may be joined by a welded portion (23) formed by welding. However, the present invention is not limited by the connection relationship between the first thermal insulation barrier (21), the second thermal insulation barrier (22), and the anchor strip (33).

[0089] Referring to FIG. 9, the thermal insulation barrier (2) is composed of a metal membrane sheet, and the thermal insulation barrier (2) can absorb thermal deformation caused by liquefied gas by forming a plurality of corrugation structures.

[0090] The thermal insulation barrier (2) may have a width (B) of 5 mm to 80 mm and a height (H) of 5 mm to 60 mm. The thermal insulation barrier (2) may have a thickness (T) of 0.01 mm to 10 mm. The thermal insulation barrier (2) may have a spacing between corrugations of 200 mm to 700 mm. Specifically, the thermal insulation barrier (2) may have a spacing between corrugations of 300 mm to 700 mm. The thermal insulation barrier (2) may have horizontal and vertical corrugations of the same size throughout the entire area without distinction between large corrugation and small corrugation. That is, since the horizontal and vertical corrugations of the thermal insulation barrier (2) are of the same size throughout, it may be easy to manufacture. However, the present invention is not limited by the corrugation spacing or corrugation size.

[0091] The thermal insulation barrier (2) can be manufactured from steel plates usable at low temperatures. The thermal insulation barrier (2) can be manufactured from thin plates with a thickness of 2.0 mm or less. Additionally, the thermal insulation barrier (2) can be manufactured from SUS304L and cold-rolled steel. The material of the thermal insulation barrier (2) can have physical properties at least as shown in Table 1 below at room temperature (25°C) as a result of a tensile test.

[0092] The material of the thermal insulation barrier (2) may have a yield stress of 200 to 355 MPa, a tensile stress of 440 MPa or less, and an elongation of 20 to 50%.

[0093] substance Yield stress [MPa] Tensile Stress [MPa] Elongation [%] Cold-rolled steel sheets 200 to 355 440 or less 20 to 50

[0094] Referring to FIG. 7, the hull (6) is separated from the thermal barrier (2) by an insulating member (3), and the hull (6) can prevent leakage of liquefied gas together with the thermal barrier (2). Specifically, the inner hull plate (6a) can prevent leakage of liquefied gas, and the inner hull plate (6a) can be manufactured from any one of stainless steel, Invar steel, and aluminum alloy. However, any metal capable of being used at cryogenic temperatures can be used without limitation in the manufacture of the inner hull plate (6a).

[0095] The inner hull plate (6a) can be manufactured from low-temperature steel. For example, the inner hull plate (6a) can be manufactured from carbon steel. It was confirmed through a Charpy impact test that the carbon steel has physical properties at least as shown in Table 2 below at low temperatures of 0°C or lower. The average impact energy applied in the Charpy impact test was 20 J in the transverse test and 40 J or more in the longitudinal test.

[0096] That is, the material of the inner hull plate (6a) may have a yield stress of 200 to 500 MPa, a tensile stress of 400 to 800 MPa, and an elongation of 10 to 40%.

[0097] substance Yield stress [MPa] Tensile Stress [MPa] Elongation [%] Charpy test temperature [°C] Minimum design temperature [°C] LT-AH 200 to 500 400 to 800 10 to 40 0 0 LT-DH -20 -15 LT-EH -40 -35 LT-FH -60 -55

[0098] In one embodiment of the present invention, the liquefied gas storage tank (10) may have an insulating barrier (2) formed of ordinary steel and a hull inner plate (6a) formed of low-temperature steel. The hull inner plate (6a), together with the insulating barrier (2), can secondarily prevent leakage of liquefied gas and reduce heat transfer from the outside to the inside.

[0099] Additionally, the liquefied gas storage tank (10) may include an insulating barrier (2) with a thickness of 2.0 mm or less. In this case, the insulating layer (32) supporting the insulating barrier (2) may be made of polymer foam. For example, the polymer foam may be expanded polypropylene foam, polystyrene foam, polyurethane foam, and reinforced polyurethane foam. Also, the polymer foam may be high-density polymer foam. For example, the polymer foam may be high-density expanded polypropylene (EPP) foam. The high-density polymer foam may have durability against the load of liquefied ammonia, which has a higher density than liquefied natural gas. The material of the insulating layer (32) may have physical properties at least as shown in Table 3 below at room temperature (25°C).

[0100] substance Density [kg / m³ 3 ] Tensile Stress [MPa] Elongation [%] Expanded polypropylene (EPP) foam 100 to 300 0.1 to 10.0 0.1 to 30 Polyurethane foam (PUF) 50 to 300 0.1 to 10.0 0.1 to 30 Reinforced Polyurethane Foam (R-PUF) 50 to 300 0.1 to 10.0 0.1 to 30

[0101] An insulating wall (31) may be laminated on the upper part of the insulating layer (32), and an insulating panel (4) may be laminated on the lower part of the insulating layer (32). The insulating wall (31) and the insulating panel (4) may be manufactured from plywood material. The plywood may have physical properties at least as shown in Table 4 below at room temperature (25℃). In Table 4 below, X represents a value measured in the planar direction of the plywood panel, and Z represents a value measured in the vertical direction (thickness direction) of the planar direction.

[0102] substance Young's modulus [MPa] Tensile Stress [MPa] X Z X Z Plywood 10.0ⅹ10 4 40.0 65.0 25.0

[0103] The insulation member (3) and the insulation panel (4) may have a thickness of 500 mm or less overall. Specifically, the insulation member (3) and the insulation panel (4) may have a thickness of 400 mm or less, and as described above, the insulation member (3) and the insulation panel (4) may have a thickness of 300 mm or less, and the insulation member (3) and the insulation panel (4) may have a thickness of 200 mm or less.

[0104] A mastic (5) may be provided between the insulation panel (4) and the inner hull plate (6a). The mastic (5) may connect the insulation panel (4) and the inner hull plate (6a). The mastic (5) may support the inner hull plate (6a). Additionally, the mastic (5) may compensate for the fact that the surface of the inner hull plate (6a) is not flat. The mastic (5) may be arranged linearly or in parallel. Multiple mastics (5) may be arranged, and the spacing between them may be equal. Additionally, each mastic (5) may have the same volume. Furthermore, the amount of mastic (5) applied may be controlled by the distance between the insulation panel (4) and the inner hull plate (6a). For example, a small volume of the mastic (5) may be applied to the protruding inner hull plate (6a). For example, the mastic (5) may be an epoxy adhesive.

[0105] The mastic (5) can be manufactured by mixing resin and a hardener. The mastic (5) can have physical properties at least as shown in Table 5 below at room temperature (25°C).

[0106] substance Young's modulus [MPa] Tensile Stress [MPa] Plywood 3.0ⅹ10 3 18.0

[0107] FIG. 10 is a partial cross-sectional view of a right-angle corner portion of a liquefied gas storage tank according to the first embodiment of the present invention.

[0108] Referring to FIGS. 2 and 3, the back surface (140) or the front surface (150) may have an angle of 90° with any one of the side surface (110a, 110b), the bottom surface (120), the top surface (130), and the corner surface (160).

[0109] Referring to FIG. 10, a right-angle corner section (C1) of a liquefied gas storage tank according to the first embodiment of the present invention may be laminated at the boundary of a wall (100) having an angle of 90°. In the right-angle corner section (C1), the spacing (P, pitch) between the folds in the thermal insulation barrier (2) may be 300 mm to 700 mm. Specifically, in the right-angle corner section (C1), the thermal insulation barrier (2) may have a pitch (P1, first pitch) of 300 mm to 500 mm. In the right-angle corner section (C1), a plurality of folds may have the same pitch.

[0110] Referring to FIG. 10, a flat portion of a liquefied gas storage tank according to a first embodiment of the present invention is described first. The flat portion of the liquefied gas storage tank (10) may be formed by a combination of a plurality of flat blocks (FB).

[0111] A flat block (FB) of a liquefied gas storage tank (10) may be placed on a flat portion of a wall (100) that forms a storage space for accommodating liquefied gas. The flat block (FB) may include a flat insulation barrier (2a), a flat insulation member (3a) placed on the outside of the flat insulation barrier (2a), and a flat insulation panel (4a) placed on the outside of the flat insulation member (3a). The flat insulation panel (4a) and the hull (6) may be joined by a mastic (5).

[0112] A plurality of flat blocks (FB) may be arranged adjacently. A slit (SL1) may be formed between the flat blocks (FB). The flat insulation member (3a) may include a flat insulation wall (31a) and a flat insulation layer (32a) disposed on the outside of the flat insulation wall (31a). The flat insulation layer (32a) may include a flat insulation portion (321a) composed of an insulating material and a flat cover portion (322a) covering at least a portion of the side of the flat insulation portion (321a). The flat cover portion (322a) may include a first cover portion (3221) covering the upper side and a second cover portion (3222) covering the lower side. In this case, the first cover portion (3221) and the second cover portion (3222) may fill the first slit (SL1) formed between the adjacent flat insulation members (3a).

[0113] The description of the thermal insulation barrier (2), thermal insulation member (3), thermal insulation panel (4) and hull (6) in Fig. 7 can be applied to the flat thermal insulation barrier (2a), flat thermal insulation member (3a) and flat thermal insulation panel (4a).

[0114] The fixing member (7) may include a stud bolt (not shown) and a nut (not shown) to fix the flat insulation panel (4a) to the hull (6). One end of the stud bolt may be fixed to the hull (6). The other end of the stud bolt may penetrate the flat insulation panel (4a). The stud bolt may be formed in a through hole connecting the flat insulation barrier (2a), the flat insulation member (3a), and the flat insulation panel (4a). The stud bolt may be pre-installed at a position corresponding to the location of the through hole. A nut may be fastened to the other end. The fixing member (7) may also be applied to a corner block (CB), and the present invention is not limited by the method of joining the fixing member (7).

[0115] The corner block (CB) is fixed to the hull (6) and may be made of a single block. The corner block (CB) may be placed at the corner where the first and second surfaces at different angles meet to form a storage space for accommodating liquefied gas.

[0116] The corner block (CB) can be connected to the flat block (FB) formed on the flat part.

[0117] FIG. 11 is a partially exploded perspective view of a corner member according to one embodiment of the present invention.

[0118] Referring to FIG. 11, the right-angle corner portion (C1) of the liquefied gas storage tank (10) according to the first embodiment of the present invention may be formed by a combination of corner blocks (CB).

[0119] In the description of the present embodiment, the direction in which the corner insulation panel (4b), corner insulation layer (32b), and corner insulation wall (31b) are stacked is referred to as the up-down direction, and the direction closer to the corner insulation wall (31b) may be referred to as the up direction.

[0120] The corner block (CB) bonds a corner insulation panel (4b) having a plurality of first holes (81) to the outside of a corner insulation layer (32b) having a plurality of second holes (82), and bonds a corner insulation wall (31b) having a plurality of third holes (83) to the inside of a corner insulation layer (32b) having a plurality of second holes (82).

[0121] Here, the first hole (81) and the second hole (82) have the same size and can be connected by bonding the corner insulation panel (4b) and the corner insulation layer (32b). A foam plug (9) can be inserted into the first hole (81) and the second hole (82). The foam plug (9) has a size corresponding to the first hole (81) and the second hole (82) and may be made of the same or similar material as the corner insulation layer (32b). A fixing member (7) for fixing the corner insulation panel (4b) to the hull (6) may be installed in the first hole (81).

[0122] The foam plug (9) can be inserted into the hole where the fixing member (7) is installed. Additionally, the foam plug (9) can be inserted into the hole where the coupling member (35) is installed. The foam plug (9) can be inserted from the corner insulation panel (4b) having the first hole (81) toward the corner insulation wall (31b) having the third hole (83), and the foam plug (9) can be inserted from the corner insulation wall (31b) having the third hole (83) toward the corner insulation panel (4b) having the first hole (81). For example, the foam plug (9) can be inserted from the hole where the fixing member (7) is installed toward the corner insulation panel (4b) having the first hole (81) from the corner insulation wall (31b) having the third hole (83).

[0123] The third hole (83) may have a diameter into which a coupling member (35) can be inserted. The third hole (83) may be formed at a position corresponding to each of the plurality of coupling members (35).

[0124] In the corner block (CB), the corner insulation panel (4b), the corner insulation layer (32b), and the corner insulation wall (31b) are combined, and a plurality of connecting members (35) can be inserted into a plurality of third holes (83) formed in the corner insulation wall (31b). The insulation barrier fixing member (24) can be in contact with the upper surface of the corner insulation wall (31b). The corner insulation wall (31b) can be formed on part or all of the upper surface of the corner insulation layer (32b).

[0125] The connecting member (35) is bolted together with the thermal insulation barrier fixing member (24), so that the thermal insulation barrier fixing member (24) can be fixed to the upper surface of the corner thermal insulation wall (31b).

[0126] A stud (25) may be formed on the upper surface of the thermal insulation barrier fixing member (24). The stud (25) may be welded to the thermal insulation barrier fixing member (24) to form an integral part.

[0127] The first fixed part (3b1) includes a first corner insulation panel (4b1), a first corner insulation layer (32b1), and a first corner insulation wall (31b1), and the second fixed part (3b2) may include a second corner insulation panel (4b2), a second corner insulation layer (32b2), and a second corner insulation wall (31b2).

[0128] The first fixing part (3b1) and the second fixing part (3b2) can have a cross-sectional area that increases in the direction toward the corner insulation panel (4b) from the insulation barrier fixing member (24).

[0129] For example, the area of ​​the first surface where the corner insulation wall (31b) contacts the corner insulation layer (32b) may be larger than the area of ​​the second surface where the corner insulation wall (31b) contacts the insulation barrier fixing member (24). Additionally, the area of ​​the third surface where the corner insulation layer (32b) contacts the corner insulation panel (4b) may be larger than the area of ​​the fourth surface where the corner insulation layer (32b) contacts the corner insulation wall (31b). Furthermore, the area of ​​the fifth surface where the corner insulation panel (4b) contacts the corner insulation layer (32b) may be smaller than the area of ​​the opposite surface where the corner insulation panel (4b) contacts the corner insulation layer (32b). That is, the corner insulation panel (4b), corner insulation layer (32b) and corner insulation wall (31b) can have a smaller width as they extend downward.

[0130] In particular, the first fixing part (3b1) and the second fixing part (3b2) may come into contact with each other from the side. At this time, the corner insulation panel (4b), the corner insulation layer (32b), and the corner insulation wall (31b) may have a lower surface that extends further than the upper surface in the direction in which the first fixing part (3b1) and the second fixing part (3b2) come into contact. The corner insulation panel (4b), the corner insulation layer (32b), and the corner insulation wall (31b) may have an inclined surface on the side in the direction in which the first fixing part (3b1) and the second fixing part (3b2) come into contact. The first fixing part (3b1) and the second fixing part (3b2) come into contact with each other and may form an overall L-shape.

[0131] A third slit (SL3) may be formed between the first fixing part (3b1) and the second fixing part (3b2). An insulating material may be inserted into the third slit (SL3).

[0132] FIG. 12 is a partial cross-sectional view of an obtuse corner portion of a liquefied gas storage tank according to a first embodiment of the present invention.

[0133] Referring to FIGS. 2 and 3, the corner surface (160) may have an angle of 135° with any one of the adjacent side surfaces (110a, 110b), bottom surface (120), and top surface (130).

[0134] Referring to FIG. 12, the obtuse corner portion (C2) of the liquefied gas storage tank according to the first embodiment of the present invention can be stacked at the boundary of the wall (100) having an angle of 135°.

[0135] The obtuse corner section (C2) may have a plurality of folds in the thermal insulation barrier (2). The folds may be spaced apart at different intervals. For example, the thermal insulation barrier (2) positioned on the upper part of the first fixed section (3b1) may have a plurality of folds spaced apart by a first pitch (P1). The thermal insulation barrier (2) positioned on the upper part of the second fixed section (3b2) may have a plurality of folds spaced apart by a second pitch (P2). The first pitch (P1) may be 300 mm to 700 mm. Specifically, the first pitch (P1) may be 300 mm to 500 mm. The second pitch (P2) may be 100 mm to 500 mm. Specifically, the second pitch (P2) may be 150 mm to 500 mm.

[0136] FIG. 13 is a partial cross-sectional view of a right-angle corner portion of a liquefied gas storage tank according to a second embodiment of the present invention.

[0137] The liquefied gas storage tank (10) according to the second embodiment may have a larger gap between the folds of the insulation barrier (2) compared to the liquefied gas storage tank (10) according to the first embodiment.

[0138] The right-angle corner section (C1) may have a plurality of folds in the thermal insulation barrier (2). The folds may be spaced apart from each other at equal intervals. The first pitch (P1) may be 300 mm to 900 mm. Specifically, the first pitch (P1) may be 400 mm to 700 mm.

[0139] FIG. 14 is a partial cross-sectional view of an obtuse corner portion of a liquefied gas storage tank according to a second embodiment of the present invention.

[0140] The obtuse corner section (C2) may have a plurality of folds in the thermal insulation barrier (2). The folds may be spaced apart at different intervals. For example, the thermal insulation barrier (2) positioned on the upper part of the first fixed section (3b1) may have a plurality of folds spaced apart by a first pitch (P1). The thermal insulation barrier (2) positioned on the upper part of the second fixed section (3b2) may have a plurality of folds spaced apart by a second pitch (P2). The first pitch (P1) may be 300 mm to 900 mm. Specifically, the first pitch (P1) may be 400 mm to 700 mm. The second pitch (P2) may be 200 mm to 600 mm. Specifically, the second pitch (P2) may be 300 mm to 500 mm.

[0141] FIG. 15 is a partial perspective view of an insulating member installed in a liquefied gas storage tank according to a third embodiment of the present invention. FIG. 16 is a partial cross-sectional view of a liquefied gas storage tank according to a third embodiment of the present invention.

[0142] Referring to FIGS. 15 and 16, the liquefied gas storage tank (10) may have a stacked structure of an insulating barrier (2), an insulating member (3), and an insulating panel (4) from the inside outward direction. The liquefied gas storage tank (10) may be supported on the hull (6) by a mastic (5) installed between the insulating panel (4) and the hull (6).

[0143] Referring to FIG. 15, the insulating member (3) and the insulating panel (4) can form a single block. Specifically, the insulating member (3) may have a structure in which an insulating wall (31) and an insulating layer (32) are stacked from the inside to the outside of the liquefied gas storage tank (10), and an insulating panel (4) may be stacked in the outside direction of the insulating layer (32). The insulating layer (32) and the insulating wall (31), and the insulating layer (32) and the insulating panel (4) may be combined with each other to form a single block.

[0144] Referring to FIG. 16, a plurality of insulating members (3) may be arranged adjacent to each other. At this time, a first slit (SL1) may be formed between adjacent insulating members (3). Additionally, the insulating member (3) may include a second slit (SL2) formed by penetrating the area where the insulating wall (31) and the insulating layer (32) are joined. An insulating material may be inserted into the first slit (SL1) and the second slit (SL2).

[0145] The above insulation material may include one or more of expanded plastic beads, polyurethane, polystyrene, polyethylene, polypropylene, polyisocyanurate, polymer foam, aerogel blanket, aerogel powder, fumed silica, calcium silicate, mineral wool, glass wool, glass microfiber, perlite, and hollow microspheres.

[0146] Specifically, the polymer foam may include foam-type insulation materials such as polyurethane foam, polystyrene foam, polyethylene foam, and polypropylene foam. The hollow microsphere may include 3M's glass bubbles.

[0147] FIG. 17 is a partial cross-sectional view of a right-angle corner portion of a liquefied gas storage tank according to a third embodiment of the present invention.

[0148] Referring to FIG. 17, the right-angle corner portion (C1) of the liquefied gas storage tank (10) according to the third embodiment of the present invention may be stacked at the boundary of a wall (100) having an angle of 90°. The liquefied gas storage tank (10) may include the insulating member (3) of FIG. 15.

[0149] FIG. 18 is a partial cross-sectional view of an obtuse corner portion of a liquefied gas storage tank according to a third embodiment of the present invention.

[0150] Referring to FIG. 18, the obtuse corner portion (C2) of the liquefied gas storage tank (10) according to the third embodiment of the present invention may be stacked at the boundary of a wall (100) having an angle of 135°. The liquefied gas storage tank (10) may include the insulating member (3) of FIG. 15.

[0151] FIG. 19 is a partial cross-sectional view of a right-angle corner portion of a liquefied gas storage tank according to the fourth embodiment of the present invention.

[0152] The liquefied gas storage tank (10) according to the fourth embodiment may have a larger gap between the folds of the insulation barrier (2) compared to the liquefied gas storage tank (10) according to the third embodiment.

[0153] The right-angle corner section (C1) may have a plurality of folds in the thermal insulation barrier (2). The folds may be spaced apart from each other at equal intervals. The first pitch (P1) may be 300 mm to 900 mm. Specifically, the first pitch (P1) may be 400 mm to 700 mm.

[0154] FIG. 20 is a partial cross-sectional view of an obtuse corner portion of a liquefied gas storage tank according to the fourth embodiment of the present invention.

[0155] The obtuse corner section (C2) may have a plurality of folds in the thermal insulation barrier (2). The folds may be spaced apart at different intervals. For example, the thermal insulation barrier (2) positioned on the upper part of the first fixed section (3b1) may have a plurality of folds spaced apart by a first pitch (P1). The thermal insulation barrier (2) positioned on the upper part of the second fixed section (3b2) may have a plurality of folds spaced apart by a second pitch (P2). The first pitch (P1) may be 300 mm to 900 mm. Specifically, the first pitch (P1) may be 400 mm to 700 mm. The second pitch (P2) may be 200 mm to 600 mm. Specifically, the second pitch (P2) may be 300 mm to 500 mm.

[0157] FIG. 21 is a partial perspective view of an insulating member installed in a liquefied gas storage tank according to the fifth embodiment of the present invention.

[0158] FIG. 22(a) is a partial perspective view of a lower insulation block installed in a liquefied gas storage tank according to the fifth embodiment of the present invention, and FIG. 22(b) is a partial perspective view of an upper insulation block installed in a liquefied gas storage tank according to the fifth embodiment of the present invention.

[0159] FIG. 23 is a partial cross-sectional view of a liquefied gas storage tank according to the fifth embodiment of the present invention.

[0160] Referring to FIGS. 21 to 23, the liquefied gas storage tank (10) may have a stacked structure in which an insulating barrier (2), an insulating member (3), and an insulating panel (4) are stacked from the inside to the outside. The liquefied gas storage tank (10) may be supported on the hull (6) by a mastic (5) installed between the insulating panel (4) and the hull (6).

[0161] Referring to FIG. 21, the insulating member (3) may have a structure in which an insulating wall (31) and an insulating layer (32) are stacked from the inside to the outside of the liquefied gas storage tank (10), and an insulating panel (4) may be stacked in the outside direction of the insulating layer (32). The insulating member (3) may be composed of a lower insulating block (LB) and an upper insulating block (UB).

[0162] Referring to FIG. 22(a), the lower insulation block (LB) may be composed of a fixed insulation wall (31-1), a fixed insulation layer (32-1) disposed on the outside of the fixed insulation wall (31-1), a lower insulation layer (32-3) disposed on the outside of the fixed insulation layer (32-1), and an insulation panel (4) disposed on the outside of the lower insulation layer (32-3). The liquefied gas storage tank (10) may be supported on the hull (6) by a mastic (5) installed between the insulation panel (4) and the hull (6). The fixed insulation wall (31-1), the fixed insulation layer (32-1), the lower insulation layer (32-3), and the insulation panel (4) may be combined to form a single block.

[0163] Referring to FIG. 22(b), the upper insulation block (UB) may be composed of a connecting insulation wall (31-2) and a connecting insulation layer (32-2) disposed on the outside of the connecting insulation wall (31-2).

[0164] Referring to FIG. 23, an upper insulation block (UB) may be placed on top of a lower insulation block (LB). Specifically, the upper insulation block (UB) may be placed adjacent to the side of the fixed insulation wall (31-1) and the fixed insulation layer (32-1) in the lower insulation block (LB). The upper insulation block (UB) may have a shape that surrounds the fixed insulation wall (31-1) and the fixed insulation layer (32-1).

[0165] Referring to FIG. 23, a plurality of lower insulation blocks (LB) may be arranged adjacently. At this time, an upper insulation block (UB) may be inserted between the fixed insulation wall (31-1) and the fixed insulation layer (32-1). An upper slit (SL11) may be formed between the upper insulation block (UB), the fixed insulation wall (31-1), and the fixed insulation layer (32-1), and a lower slit (SL12) may be formed between the plurality of lower insulation blocks (LB). Although not shown in the drawing, a second slit (SL2) may be included that penetrates the insulation wall (31) and the insulation layer (32).

[0166] For example, the lower insulation layer (32-3) may have a thickness of 50 mm to 500 mm. The fixed insulation layer (32-1) and the connecting insulation layer (32-2) may have a thickness of 50 mm to 400 mm. The lower insulation layer (32-3) may have a thickness greater than that of the fixed insulation layer (32-1) and the connecting insulation layer (32-2).

[0167] Insulating material may be inserted into the upper slit (SL11) and the lower slit (SL12). The insulating material may include one or more of expanded plastic beads, polyurethane, polystyrene, polyethylene, polypropylene, polyisocyanurate, polymer foam, aerogel blanket, aerogel powder, fumed silica, calcium silicate, mineral wool, glass wool, glass microfiber, perlite, and hollow microspheres. Specifically, the polymer foam may include foam-type insulating materials such as polyurethane foam, polystyrene foam, polyethylene foam, and polypropylene foam. The hollow microspheres may include glass bubbles from 3M.

[0168] FIG. 24 is a partial cross-sectional view of a right-angle corner portion of a liquefied gas storage tank according to the fifth embodiment of the present invention.

[0169] Referring to FIG. 24, the right-angle corner portion (C1) of the liquefied gas storage tank (10) according to the fifth embodiment of the present invention can be stacked at the boundary of the wall (100) having an angle of 90°.

[0170] A corner block (CB) may include an insulating barrier fixing member (24), a corner insulating wall (31b) disposed on the outside of the insulating barrier fixing member (24), a corner insulating layer (32b) disposed on the outside of the corner insulating wall (31b), a corner lower insulating wall (36b) disposed on the outside of the corner insulating layer (32b), a corner lower insulating layer (37b) disposed on the outside of the corner lower insulating wall (36b), and a corner insulating panel (4b) disposed on the outside of the corner lower insulating layer (37b).

[0171] A hole penetrating in the thickness direction may be formed in the first corner insulation wall (31b1) and the first corner insulation layer (32b1), and a foam plug (9) and a coupling member (35) may be inserted into the hole.

[0172] The first fixed part (3b1) may include a first corner insulation wall (31b1), a first corner insulation layer (32b1), a first corner lower insulation wall (36b1), a first corner lower insulation layer (37b1), and a first corner insulation panel (4b1). The second fixed part (3b2) may include a second corner insulation wall (31b2), a second corner insulation layer (32b2), a second corner lower insulation wall (36b2), a second corner lower insulation layer (37b2), and a second corner insulation panel (4b2).

[0173] A folded space (38b) may be formed between the first corner insulation layer (32b1) and the second corner insulation layer (32b2). Insulation material may be filled into the folded space (38b).

[0174] FIG. 25 is a partial cross-sectional view of an obtuse corner portion of a liquefied gas storage tank according to the fifth embodiment of the present invention.

[0175] Referring to FIG. 25, the obtuse corner portion (C2) of the liquefied gas storage tank (10) according to the fifth embodiment of the present invention can be stacked at the boundary of the wall (100) having an angle of 135°.

[0176] The obtuse corner section (C2) may have a plurality of folds in the thermal insulation barrier (2). The folds may be spaced apart at different intervals. For example, the thermal insulation barrier (2) positioned on the upper part of the first fixed section (3b1) may have a plurality of folds spaced apart by a first pitch (P1). The thermal insulation barrier (2) positioned on the upper part of the second fixed section (3b2) may have a plurality of folds spaced apart by a second pitch (P2). The first pitch (P1) may be 300 mm to 900 mm. Specifically, the first pitch (P1) may be 400 mm to 700 mm. The second pitch (P2) may be 200 mm to 600 mm. Specifically, the second pitch (P2) may be 300 mm to 500 mm.

[0177] FIG. 26 is a partial cross-sectional view of a right-angle corner portion of a liquefied gas storage tank according to the 6th embodiment of the present invention.

[0178] FIG. 27 is a partial cross-sectional view of an obtuse corner portion of a liquefied gas storage tank according to the 6th embodiment of the present invention.

[0179] In the liquefied gas storage tank (10) according to the sixth embodiment, a corner insulation wall (31b) may be formed on a part of the upper surface of the corner insulation layer (32b). The corner insulation wall (31b) may be formed on the upper part of the area where the first fixing part (3b1) and the second fixing part (3b2) meet.

[0180] FIG. 28 is a partial cross-sectional view of a right-angle corner portion of a liquefied gas storage tank according to the seventh embodiment of the present invention.

[0181] FIG. 29 is a partial cross-sectional view of an obtuse corner portion of a liquefied gas storage tank according to the seventh embodiment of the present invention.

[0182] The corner portion according to the 7th embodiment may have a structure in which a corner insulation wall (31b) and a corner insulation layer (32b) are stacked from the inner side to the outer side of the liquefied gas storage tank (10), and a corner insulation panel (4b) may be stacked in the outer side of the corner insulation layer (32b). The corner insulation member (3b) may be composed of a lower insulation block (LB) and an upper insulation block (UB).

[0183] The lower insulation block (LB) may be composed of a corner fixed insulation wall (31-1b), a corner fixed insulation layer (32-1b) disposed on the outside of the corner fixed insulation wall (31-1b), a corner lower insulation layer (32-3b) disposed on the outside of the corner fixed insulation layer (32-1b), and a corner insulation panel (4b) disposed on the outside of the corner lower insulation layer (32-3b).

[0184] The upper insulation block (UB) may be composed of a corner connecting insulation wall (31-2b) and a corner connecting insulation layer (32-2b) disposed on the outside of the corner connecting insulation wall (31-2b).

[0185] The upper insulation block (UB) may be placed on top of the lower insulation block (LB). Specifically, the upper insulation block (UB) may be placed adjacent to the side of the corner-fixed insulation wall (31-1b) and the corner-fixed insulation layer (32-1b) in the lower insulation block (LB). The upper insulation block (UB) may have a shape that surrounds the corner-fixed insulation wall (31-1b) and the corner-fixed insulation layer (32-1b).

[0186] FIG. 30 is a partial cross-sectional view of a right-angle corner portion of a liquefied gas storage tank according to the eighth embodiment of the present invention.

[0187] FIG. 31 is a partial cross-sectional view of an obtuse corner portion of a liquefied gas storage tank according to the eighth embodiment of the present invention.

[0188] A folded space (38b) may be formed between the first corner fixed insulation layer (32-1b1) and the second corner fixed insulation layer (32b-1b2). Insulation material may be filled into the folded space (38b).

[0189] FIG. 32 is an exploded perspective view of an insulating member installed in a liquefied gas storage tank according to the ninth embodiment of the present invention.

[0190] In detail, the insulating member (3) and the insulating panel (4) can form a box-shaped insulating box (B). In detail, the bottom surface of the insulating box (B) is composed of an insulating panel (4), and a side panel (41) can be formed by extending upward from the side edge of the insulating panel (4). The insulating panel (4) and the side panel (41) can form a receiving space (42). An insulating layer (32) may be inserted inside the receiving space (42). The inside of the receiving space (42) can be maintained in a vacuum state.

[0191] Meanwhile, it may include a panel-shaped grid member (43) formed vertically to the lower surface of the insulation panel (4) inside the receiving space (42); and an insulation material (44) inserted between the grid member (43) and the side panel (41). At least one of a metal fiber laminated composite, a multilayer metal laminated composite, and a polymer film may be installed on one side of the insulation box (B). Specifically, at least one of a metal fiber laminated composite, a multilayer metal laminated composite, and a polymer film may be adhered to one side of the insulation box (B). However, the present invention is not limited thereto.

[0192] For example, the metal fiber laminated composite may be composed of at least one of a metal material such as aluminum, stainless steel, manganese, iron, copper, or zinc, and a fiber material such as glass fiber, carbon fiber, basalt fiber, or aramid fiber. For example, the metal fiber laminated composite may have a form in which at least one fiber material among glass fiber, carbon fiber, basalt fiber, or aramid fiber is laminated on at least one surface of a metal sheet made of a metal material such as aluminum, stainless steel, manganese, iron, copper, or zinc. The metal fiber laminated composite may be formed by impregnating a polymer material into at least one of a metal material such as aluminum, stainless steel, manganese, iron, copper, or zinc, and a fiber material such as glass fiber, carbon fiber, basalt fiber, or aramid fiber. The metal fiber laminated composite may be provided in the form of a prepreg.

[0193] For example, a multilayer metal laminated composite can have a form in which metal materials such as aluminum, stainless steel, manganese, iron, copper, and zinc are stacked in multiple layers. The multilayer metal laminated composite can be formed by impregnating metal materials such as aluminum, stainless steel, manganese, iron, copper, and zinc with a polymer material. The multilayer metal laminated composite can be prepared in the form of prepreg.

[0194] For example, the polymer film may include polymeric materials such as polypropylene, polyethylene, and polystyrene. The polymer film may be formed in the form of a film or a thin film, but the present invention is not limited thereto.

[0195] Specifically, the insulation material (44) may be at least one of expanded plastic beads, polyurethane, polystyrene, polyethylene, polypropylene, polyisocyanurate, polymer foam, aerogel blanket, aerogel powder, fumed silica, calcium silicate, mineral wool, glass wool, glass microfiber, perlite, and hollow microspheres.

[0196] Specifically, the insulation panel (4) and the side panel (41) may be formed from at least one of a foam composite, plywood, a polymer composite, and a sandwich composite.

[0198] In this way, the liquefied gas storage tank (10) according to one embodiment of the present invention includes a layer of thermal insulation barrier (2), thereby reducing the manufacturing cost of the liquefied gas storage tank (10).

[0199] In addition, the above-mentioned liquefied gas storage tank (10) can have the thermal insulation barrier (2) and the hull (6) together prevent leakage of liquefied gas and reduce heat conduction. The hull (6) can be formed of low-temperature steel to act as a secondary barrier, and the thermal insulation barrier (2) can be manufactured as a thin plate.

[0200] Additionally, the insulation member (3) includes an insulation wall (31) and an insulation layer (32), and the insulation layer (32) may be composed of an insulation portion (321) that is laminated with the insulation wall (31) and a cover portion (322) that covers the side of the insulation portion (321). The cover portion (322) may cover a portion of the side of the insulation portion (321) from the top and cover a side other than the side from the bottom. The insulation member (3) may be composed of multiple units, and when the insulation members (3) are arranged adjacently, the cover portion (322) may be stacked vertically between the adjacent insulation members (3). Specifically, the cover portion (322) may be overlapped vertically between the adjacent insulation members (3). Thus, the insulation members (3) are arranged adjacently, and the space between the insulation members (3) can be filled by the cover portion (322). Therefore, the installation time of the insulation member (3) may be reduced.

[0201] The above liquefied gas storage tank (10) is intended to store liquefied ammonia, and the thermal barrier (2) can be manufactured from cold-rolled steel sheets so as to withstand the temperature (-34℃) of the ammonia.

[0202] The above insulation layer (32) is formed of high-density polymer foam and can have strength capable of withstanding the load of liquid ammonia.

[0203] The present invention is not limited to the embodiments described above, and it is obvious that a combination of the above embodiments or a combination of at least one of the above embodiments and known technology may be included as another embodiment.

[0204] Although the present invention has been described above with reference to embodiments, this is merely illustrative and does not limit the invention. Those skilled in the art will understand that various combinations, modifications, and applications not exemplified in the embodiments are possible without departing from the essential technical content of the embodiments. Therefore, technical details regarding modifications and applications that can be easily derived from the embodiments of the present invention should be interpreted as being included in the present invention. Explanation of the symbols

[0205] 1: Ship 2: Insulating barrier 21: First insulating barrier 22: Second insulation barrier 23: Welded joint 24: Insulating barrier fixing member 25: Stud 3: Insulating member 31: Insulating wall 32: Insulation layer 321: Insulation section 3211: 1st insulation section 3212: 2nd insulation section 322: Cover section 3221: First cover section 3222: 2nd Cover Section 33: Anchor Strip 34: Binding member 35: Connecting member 4: Insulation panel 41: Side panel 42: Accommodation space 43: Grid member 44: Insulation 5: Mastic 6: Hull SL: Slit FB: Flat block CB: Corner block P: Pitch 7: Fixing member 8: Hole 9: Foam plug 100: Wall 110: Side 120: If 130: Top surface 140: Back surface 150: Front 160: Corner 170: Storage space

Claims

Claim 1 An insulating wall; and an insulating layer installed on the outer side of the insulating wall; wherein the insulating layer comprises an insulating portion; and a cover portion covering at least a portion of the side of the insulating portion; wherein the cover portion comprises a first cover portion covering one side of the insulating portion; and a second cover portion covering the other side of the insulating portion; wherein the first cover portion and the second cover portion are arranged at different heights, and the first cover portion is arranged vertically above and below the second cover portion provided in an adjacent insulating layer, and the second cover portion is arranged vertically above and below the first cover portion provided in an adjacent insulating layer. Claim 2 delete Claim 3 In claim 1, the insulating layer is arranged adjacently with a plurality of slits formed therein, and the first cover portion and the second cover portion are insulating members arranged vertically above and below the slits. Claim 4 In claim 1, the insulating layer is an insulating member formed from at least one insulating material selected from foamed plastic beads, polyurethane, polystyrene, polyethylene, polypropylene, polyisocyanurate, polymer foam, aerogel blanket, aerogel powder, fumed silica, calcium silicate, mineral wool, glass wool, glass microfiber, perlite, and hollow microspheres. Claim 5 In claim 4, the insulation layer is an insulation member formed of high-density polymer foam. Claim 6 In claim 1, the insulating wall is an insulating member formed from at least one of a foam composite, plywood, a polymer composite, and a sandwich composite. Claim 7 A liquefied gas storage tank comprising: an insulating barrier in contact with liquefied ammonia; an insulating member installed on the outer side of the insulating barrier; and an insulating panel installed on the outer side of the insulating member; wherein the insulating member comprises: an insulating wall; and an insulating layer installed on the outer side of the insulating wall; wherein the insulating layer comprises: an insulating portion; and a cover portion covering at least a portion of the side of the insulating portion; wherein the cover portion comprises: a first cover portion covering one side of the insulating portion; and a second cover portion covering the other side of the insulating portion; wherein the insulating panel is supported on a hull made of carbon steel; and wherein the insulating barrier has a thickness of 2.0 mm or less and is made of cold-rolled steel plate. Claim 8 delete Claim 9 delete Claim 10 In claim 7, the insulating member and the insulating panel are combined with each other in a liquefied gas storage tank. Claim 11 In claim 7, the insulating layer is formed of at least one insulating material selected from foamed plastic beads, polyurethane, polystyrene, polyethylene, polypropylene, polyisocyanurate, polymer foam, aerogel blanket, aerogel powder, fumed silica, calcium silicate, mineral wool, glass wool, glass microfiber, perlite, and hollow microspheres, for a liquefied gas storage tank. Claim 12 In claim 7, at least one of the insulation wall and the insulation panel is formed from at least one of a foam composite, plywood, a polymer composite, and a sandwich composite, forming a liquefied gas storage tank. Claim 13 delete Claim 14 A vessel including a liquefied gas storage tank of Article 7.

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