KR20220036384A - Insulation system for liquified gas storage tank and contruction method thereof - Google Patents

Abstract

The present invention relates to an insulation system for a liquefied gas storage tank for insulating a liquefied gas stored inside a tank body, comprising: a sheet part fixedly installed on a tank body; an insulating part for forming a plurality of insulating layers by spraying and stacking foam on the sheet part; and a reinforcing layer in a form of a mesh provided between the plurality of insulating layers. An object of the present invention is to provide the insulation system for a liquefied gas storage tank and a construction method thereof that can prevent damage to the insulation system due to a difference in thermal expansion coefficient between an outer wall of a storage tank and a foam in a cryogenic environment and maintain the insulation performance of the insulation system.

Description

Insulation system for liquefied gas storage tank and its construction method

The present invention relates to a thermal insulation system of a liquefied gas storage tank for storing liquefied gas, and more particularly, a liquefied gas storage tank formed by spraying and laminating a polymeric spray foam on the outer wall of the storage tank. of the insulation system and its construction method.

Recently, as environmental pollution regulation standards for ships have been strengthened, interest in eco-friendly and high-efficiency liquefied gas fuels such as liquefied natural gas (LNG) or liquefied petroleum gas (LPG) This is increasing.

Liquefied natural gas is liquefied by cooling methane obtained by refining natural gas collected from a gas field. .

In particular, liquefied natural gas (hereinafter referred to as 'LNG') is obtained by cooling natural gas to a cryogenic temperature (about -163 ℃). It is very suitable for long-distance transport.

Liquefied gas is transported in a gaseous state through a gas pipeline on land or sea, or stored in a liquid state in a transport ship and transported to a remote consumer.

A liquefied gas carrier for loading and unloading liquefied gas to a destination on land by navigating the sea with LNG, etc. A liquefied gas storage tank (commonly referred to as a 'cargo hold') that can withstand the cryogenic temperature of LNG is provided in an LNG RV (regasification vessel).

In addition, LNG FPSO (Floating, Production, Storage and Offloading), which is used to liquefy and store the produced natural gas directly at sea, and to transfer stored LNG to an LNG carrier when necessary, and to store LNG unloaded from an LNG carrier at sea Liquefied gas storage tanks installed in LNG carriers or LNG RVs are also included in offshore structures such as LNG FSRUs (Floating Storage and Regasification Units) that vaporize LNG as needed and supply it to onshore consumers.

Such a liquefied gas storage tank can be classified into a membrane type and an independent type depending on whether the load of the cargo acts directly on the insulation material.

Membrane-type storage tanks are divided into No 96 type and Mark III type, and independent storage tanks are divided into Type A, Type B, and Type C according to the regulations of the International Maritime Organization (IMO). The storage tank includes a spherical type MOSS tank and a prismatic type SPB tank.

The membranous storage tank is directly connected to the structure of the hull and is not separated from the hull, and has a structure in which a primary barrier and a secondary barrier are stacked on the inner wall of the hull. As the membranous tank is directly connected to the hull, the load of the liquefied gas stored inside is transferred to the hull without the tank supporting it.

On the other hand, the independent storage tank is manufactured to be mounted on the hull by being separated from the hull structure, and has a structure surrounded by an insulating material on the outer wall of the tank. The independent tank is separated from the hull and supported by a support structure provided inside the hull, so the load of the liquefied gas stored therein acts directly on the tank.

Independent storage tanks, unlike membranous storage tanks, do not have a complicated barrier structure, and are relatively advantageous in terms of structural stability against sloshing, etc. compared to membrane storage tanks. There is an advantage in that maintenance is easy.

Republic of Korea Patent Publication No. 10-1034472

The independent storage tank includes a tank body having an internal space for storing cryogenic liquefied gas such as LNG, and the evaporation of liquefied gas by minimizing heat penetration into the cryogenic liquefied gas stored inside the tank body, that is, boil-off gas (BOG; It consists of an insulation system to reduce boil-off gas, and is supported by a separate support structure provided inside the hull.

In the prior art, the independent storage tank is a polyurethane foam on the outer surface of the tank body made of an alloy strong at low temperatures, such as aluminum alloy, SUS (Steel Use Stainless), or 9% nickel alloy (9% Nickel steel) A thermal insulation system is formed by spraying (foaming or applying) a polymeric spray foam such as (PUF; Polyurethane Foam).

Insulation system, a method of spraying and stacking the foam on the outer surface of the tank body for a certain period of time using a device such as a spray gun may be applied, and the type of foam or insulation of the foam Its thickness is determined by its performance.

Here, in a low-temperature (-40 ℃) environment such as an LPG storage tank, the insulation performance of the insulation system can be maintained through the foam sprayed on the outer wall of the storage tank, but in a cryogenic (-163 ℃) environment such as an LNG storage tank Due to the large difference in the coefficient of thermal expansion between the outer wall of the storage tank and the foam sprayed on the outer wall of the storage tank, the insulation performance of the insulation system may be deteriorated.

Specifically, due to the large difference in the coefficient of thermal expansion between the tank body in which liquefied gas is stored and the foam sprayed on the outer surface of the tank body, the foam may contract or relax, causing damage to the insulation system such as cracks. In addition, when leakage (or leakage, leakage) of liquefied gas occurs, the foamed foam adhered to the tank body is separated from the tank body due to the leaked liquefied gas, which may result in deterioration of the insulation performance of the insulation system.

On the other hand, in such an independent storage tank, a leak path must be provided to minimize the direct effect on the hull when leakage of liquefied gas occurs. When forming the system, it is difficult to form a leakage path for preparing the leakage of liquefied gas because the tank body and the foam are completely adhered.

The present invention forms an insulation system for insulation of liquefied gas accommodated in the storage tank by spraying foam on the outer wall of the storage tank, and prevents damage to the insulation system due to the difference in thermal expansion coefficient between the outer wall of the storage tank and the foam in a cryogenic environment An object of the present invention is to provide a thermal insulation system for a liquefied gas storage tank capable of maintaining the thermal insulation performance of the thermal insulation system and a construction method thereof.

In addition, it is an object of the present invention to provide an insulation system for a liquefied gas storage tank and a construction method thereof, which can prepare a leakage path through which the leaked liquefied gas can be moved when leakage of the liquefied gas occurs to prepare for the leakage of the liquefied gas.

According to one aspect of the present invention, there is provided an insulation system for a liquefied gas storage tank for insulating the liquefied gas stored in the tank body, comprising: a seat portion fixedly installed on the tank body; a heat insulating unit for forming a plurality of heat insulating layers by spraying and stacking foam on the sheet unit; and a reinforcing layer in the form of a mesh provided between the plurality of heat insulation layers may be provided.

It may further include a fixing part for fixing the sheet part and the reinforcing layer to the tank body.

In addition, the fixing part, the stud (stud) installed on the tank body; and a fastening member coupled to the stud.

In addition, the reinforcing layer may be spaced apart from the tank body and located at the end of the stud.

In addition, the fixing part may further include a fixing bracket coupled to the end of the stud to fix the position of the reinforcing layer.

In addition, the fixing bracket includes a central portion having a cutout groove so that the end of the stur can be inserted therethrough; And it may include a pair of wings extending long on both sides around the central portion.

In addition, the stud may be made of any one of a metal material, a composite material, and wood.

In addition, the fixing part further comprises a connecting member fixed to the outer surface of the tank body to install the stud to the tank body, the stud is installed perpendicular to the outer surface of the tank body by the connecting member can be

In addition, the fastening member may be provided with any one of a washer (washer) or a nut (nut).

In addition, the seat portion may include a breathable insulating material.

In addition, in order to improve the watertightness of the heat insulator and prevent damage to the heat insulator, it may further include a protection coating layer applied on the heat insulator.

According to another aspect of the present invention, there is provided a method of constructing an insulation system for a liquefied gas storage tank for insulating liquefied gas stored inside a tank body, comprising installing a seat portion on the outside of the tank body through a fixing portion installed on the tank body step; And there may be provided a method of constructing a thermal insulation system for a liquefied gas storage tank comprising the step of forming a thermal insulation portion by spraying and laminating the foam on the sheet portion.

In the step of forming the heat insulating part, a plurality of heat insulating layers may be formed by spraying and stacking foam on the sheet part, and a reinforcing layer in the form of a mesh may be installed between the heat insulating layers.

The present invention is a tank body and foam for accommodating liquefied gas inside by fixing the seat part to the outer surface of the tank body, and spraying and stacking foam such as polyurethane foam on the seat part by a designed thickness to form an insulating part. It is possible to prevent damage to the insulation system due to the difference in thermal expansion coefficient and maintain the insulation performance of the insulation system.

In addition, since the seat portion includes a breathable insulating material, the leaked liquefied gas can be moved in the entire outer surface of the tank body regardless of the leaking location of the liquefied gas, so damage to the insulation system due to leakage of liquefied gas and insulation It may have an advantageous effect of preventing performance degradation.

In addition, it further includes a reinforcing layer in the form of a mesh to increase the rigidity of the foam foamed on the seat portion, and cracks or separation of the foam when the pressure rises due to leakage of liquefied gas between the tank body and the heat insulating portion. may have the effect of preventing

1 is a view schematically showing a thermal insulation system of a liquefied gas storage tank according to an embodiment of the present invention.
FIG. 2 is an enlarged view of area 'A' of FIG. 1 .
FIG. 3 is a view showing a plan view excluding some components of the heat insulation system shown in FIG. 1 .
4 is a view for explaining that the sheet portion of the insulation system of the liquefied gas storage tank according to an embodiment of the present invention includes two or more breathable insulation materials having different densities.
5 is a view showing that a reinforcing layer is further formed in the heat insulation system of the liquefied gas storage tank according to an embodiment of the present invention.
6 is an enlarged view of the fixing bracket of FIG. 5 in a perspective view.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. First of all, it should be noted that in adding reference numerals to the components of each drawing, the same components are given the same reference numerals as much as possible even though they are indicated on different drawings. In addition, in describing the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted. In addition, preferred embodiments of the present invention will be described below, but the technical spirit of the present invention is not limited thereto and may be variously implemented by those skilled in the art without being limited thereto.

In describing the present invention, the liquefied gas is generally liquefied such as LNG (Liquified Natural Gas) at cryogenic temperature (about -163° C.), LPG (Liquefied Petroleum Gas) or Liquefied Ethylene Gas, etc. It may include all gas fuels stored as , and liquefied gas may mean including not only liquefied gas in a liquid state but also vaporized liquefied gas.

1 is a view schematically showing a thermal insulation system of a liquefied gas storage tank according to an embodiment of the present invention, FIG. 2 is an enlarged view showing area 'A' of FIG. 1, and FIG. 3 is in FIG. It is a view showing a plan view excluding some components of the illustrated insulation system.

In addition, Figure 4 is a view for explaining that the sheet portion of the insulation system of the liquefied gas storage tank according to an embodiment of the present invention includes two or more breathable insulation materials having different densities, Figure 5 is one of the present invention It is a view showing that a reinforcing layer is further formed in the insulation system of the liquefied gas storage tank according to the embodiment.

The present invention relates to a thermal insulation system (100) of a liquefied gas storage tank for insulating liquefied gas stored inside the storage tank by spraying and stacking spray foam on the outer surface of the tank body (10), and the structure of the hull It can be applied to an independent liquefied gas storage tank prepared separately from the hull and mounted on the hull, and preferably applied to an independent liquefied gas storage tank of SPB (Self-supporting prismatic-shape IMO Type B) type.

The tank body 10 may be made of an alloy that is strong at low temperatures, such as aluminum alloy, Steel Use Stainless (SUS), or 9% nickel alloy (9% Nickel steel), and is preferably inexpensive while It can be made of high-manganese steel (High-Mn steel) material that can withstand extremely low temperatures due to excellent brittleness resistance at low temperatures.

The insulation system 100 may be formed by spraying and stacking foam such as polyurethane foam (PUF) on the outer surface of the tank body 10 .

At this time, when storing LNG in the tank body 10, the temperature of the LNG is about -163 ℃, which is very low compared to LPG having a temperature of about -40 ℃, so the tank body made of a metal material in a cryogenic environment ( 10) and polymeric foam, it is necessary to prevent damage to the insulation system due to the difference in thermal expansion coefficient and maintain insulation performance.

1 to 2, in the insulation system 100 of a liquefied gas storage tank according to an embodiment of the present invention, the seat part 110 is installed on the outer surface of the tank body 10, and the seat part 110 ) by spraying and stacking the foam a plurality of times on the heat insulating section 130 is formed.

In this embodiment, the tank body 10 is made of an alloy resistant to low temperature and serves as a primary barrier of the liquefied gas stored therein, and the insulation system 100 prevents heat transfer of cryogenic liquefied gas to the hull. It can play a role in preventing this from happening.

In other words, the thermal insulation system 100 has a thermal insulation function that minimizes heat penetration into the cryogenic liquefied gas stored in the tank body 10, and the liquefied gas leaked from the tank body 10 or the leaked liquefied gas evaporates. It can perform a function of preventing thermal deformation or damage of the hull due to the generated cryogenic gas (hereinafter referred to as 'evaporated gas').

Hereinafter, the insulation system 100 of the liquefied gas storage tank according to an embodiment of the present invention will be described in detail.

Insulation system 100 of a liquefied gas storage tank according to an embodiment of the present invention, before spraying the foam from the outside of the tank body 10, the seat portion 110 on the outer surface of the tank body (10) By fixing and stacking and spraying the foam on the sheet portion 110 to a designed thickness to form the heat insulating section 130 , the heat insulating section 130 may not directly contact the tank body 10 , and the tank body 10 ) and the thermal expansion coefficient difference of the foam can prevent damage to the thermal insulation unit 130 .

The seat portion 110 is to be installed on the outer surface of the tank body 10 before spraying the foam from the outside of the tank body 10, including the upper surface, the bottom surface, and the side surface of the tank body 10 ) can be applied over the entire outer surface of

The seat unit 110 may include a breathable insulating material 111 having moisture permeability, and the breathable insulating material 111 of this embodiment may be at least one of glass wool and melamine foam.

In the prior art, when leakage of liquefied gas from a storage tank occurs, a leak path is installed to minimize a direct effect on the insulation system, and the leaked liquefied gas flows along the leakage path.

Of the leaked liquefied gas, boil-off gas is discharged through a vent line connected to the outside, and the liquid-state liquefied gas is stored in a separately installed leak collection device and maintained for 15 days.

Here, the leakage path is formed by installing a channel or a hygroscopic insulating material in a vulnerable area with a high possibility of leakage of liquefied gas, such as a welding portion of an outer plate forming the outer wall of the storage tank or a welding portion of an internal reinforcement (girder or longe, etc.) Since there is also a possibility that the liquefied gas may leak from the liquefied gas, there are still concerns about damage to the insulation system due to the leaked liquefied gas and deterioration of the insulation performance due to the leakage of the liquefied gas.

In the insulation system 100 of the liquefied gas storage tank according to an embodiment of the present invention, a breathable insulation 111 having moisture permeability is installed over the entire outer surface of the tank body 10, and the leaking position of the liquefied gas is Since the movement of the leaked liquefied gas is possible regardless of the leak, it is possible to prevent damage to the insulation system 100 due to leakage of the liquefied gas and deterioration of the insulation performance thereby.

The seat portion 110 may be provided such that one breathable insulator 111 covers the entire outer surface of the tank body 10, but preferably, a plurality of breathable insulators having a certain size for the convenience of installation work ( 111) and may be provided to be connected to each other on the outer surface of the tank body 10 .

In addition, the breathable insulating material 111 of this embodiment may be configured to form one or more layers on the outer surface of the tank body 10, and is attached to the outer surface of the tank body 10 at regular intervals according to the design, It may be fixed to the outer surface of the tank body through a separate fixing part 120 to be described later.

The seat portion 110 of the present embodiment may further include one or more impermeable layers 113 depending on the installation location.

The water impermeable layer 113 may serve to prevent excessive penetration of the foam in a gel state into the breathable insulating material 111 in the process of spraying and laminating the foam on the sheet unit 110 .

The water-impermeable layer 113 of the present embodiment may be formed of any one of glass-coth, aluminum foil, or kraft paper.

When the air permeable insulator 111 forms a plurality of layers, it may be preferable that the water impermeable layer 113 be provided in at least one of the air permeable insulators 111 forming each layer.

As an example, the air permeable insulating material 111, as shown in FIG. 2, may be separated with an impermeable layer 113 therebetween to form two layers.

At this time, based on the water impermeable layer 113, the breathable insulating material 111 located in the tank body 10 side direction to discharge (or vent) the leak path of the leaked liquefied gas or the boil-off gas to the outside. It may serve as a passageway for, and the breathable insulation 111 in the opposite direction may serve to improve the adhesion of the foam sprayed and laminated on the sheet portion 110 .

In the present embodiment, the water-impermeable layer 113 may be installed only in some areas, not on the entire outer surface of the tank body 10 , in consideration of the operator's installation convenience and efficiency.

If the breathable insulation 111 has a sufficient thickness, even if the foam penetrates into the breathable insulation 111, the risk of blocking the leakage path of the leaked liquefied gas or the discharge passage of the boil-off gas is reduced, so the installation of the water impermeable layer 113 may not be necessary.

If the thickness of the breathable insulator 111 is increased, the thermal insulation performance is rather deteriorated, so areas requiring sufficient thermal insulation performance, such as the side or lower surface of the tank body 10, have an impermeable layer between the breathable insulation 111 ( 113) should be installed to prevent penetration of the foam, and conversely, such as the upper surface of the tank body 10, even if leakage of liquefied gas occurs, the effect on the hull is small and the movement of the boil-off gas is definitely required. In this case, without installing the water-impermeable layer 113, by installing the breathable insulating material 111 thickly, a smooth flow of the leaked liquefied gas or boil-off gas may be possible.

In addition, since the installation operation of the water impermeable layer 113 may be cumbersome in an area having a complex shape because a key or a support structure supporting the tank body 10 is located, the area is a breathable insulation material without the water impermeable layer 113. Compression installation can be substituted.

The insulation system 100 of the liquefied gas storage tank according to an embodiment of the present invention may further include a fixing part 120 for fixing the seat part 110 to the tank body 10 .

The fixing part 120 may be provided with a stud 121 installed on the tank body 10 and a fastening member 123 coupled to the stud, as shown in FIG. 3 .

The stud 121 may be any one of a metal material, a composite material, or wood, and the fastening member 123 may be provided with any one of a washer or a nut.

Here, when a washer is used as the fastening member 123, the inner diameter of the washer corresponds to the diameter of the stud, and the inner circumferential surface of the washer is preferably formed with a screw groove corresponding to the thread formed on the outer circumferential surface of the stud 121. can do.

In addition, the fixing part 120 may further include a connection member (not shown) fixed to the outer surface of the tank body 10 in order to install the stud 121 to the tank body 10 , and the stud 121 ) may be installed perpendicularly to the outer surface of the tank body 10 through the connecting member.

In this embodiment, the connecting member may be provided with a metal material and welded to the tank body 10 , or may be provided with a non-metal material and be adhesively fixed to the tank body 10 .

Here, the seat portion 110 may be pre-formed with a hole (unsigned) having a size corresponding to or larger than the diameter of the stud 121 before being installed on the outer surface of the tank body 10 .

The heat insulating part 130 is formed by spraying and stacking a polymer-based foam a plurality of times on the outside of the tank body 10, and the foam may include a polyurethane foam (PUF) material having excellent thermal insulation performance.

Insulation unit 130 of this embodiment, when leakage of liquefied gas from the tank body 10 occurs, the liquefied gas leaked through the breathable insulating material 111 or the cryogenic gas from which the liquefied gas is evaporated is the outside of the insulation system 100 It performs the function of preventing leakage.

The heat insulation unit 130 of this embodiment may have a different thickness depending on the size and type of the tank body 10 , and sufficient insulation performance is provided in consideration of the density of the foam laminated and sprayed on the outer surface of the tank body 100 . It may be desirable to be designed to have a thickness that can be secured.

1 to 2 , although it is illustrated that the heat insulating unit 130 is formed of one layer, the present invention is not limited thereto, and the heat insulating unit 130 may be formed of a single layer, as shown in FIG. 5 . As shown in , it may consist of two or more layers.

In addition, the operation may be repeatedly made until it has the designed thickness of the heat insulating part 130 , and on the outermost side of the heat insulating part 130 , to improve the watertightness of the heat insulating part 130 and prevent damage to the heat insulating part 130 . A protection coating layer 140 may be applied and formed.

The heat insulating part 130 may be formed by spraying and stacking foam from the outside of the tank body 10 using a device such as a spray gun, and the method of forming the heat insulation part 130 by spraying and stacking such foam is As a known matter, a detailed description will be omitted.

On the other hand, the tank body 10 is affected by the weight of the insulation system 100 itself at a specific position. In particular, when the heat insulating part 130 is formed in a direction opposite to the direction of gravity based on the breathable heat insulating material 111, when such a weight is applied to the breathable heat insulating material 111, the breathable heat insulating material 111 is formed over time. can be compressed.

In addition, in the process of installing the breathable insulator 111 on the outside of the tank body 10, when the operator rises to the corresponding position and proceeds with the operation, the weight of the operator is added and the breathable insulation 111 can be completely compressed, Accordingly, there is a fear that the flow of leaked liquefied gas or boil-off gas through the breathable insulating material 111 is blocked.

In order to solve this problem, it may be considered to install a high-density (60 kg/m3 or more) air permeable insulation material on the entire outer surface of the tank body 10, but the high-density air permeable insulation material is not only expensive, but also rapid movement of leaked liquefied gas As this becomes difficult, it may be inefficient both in terms of economics and stability.

4 is a view for explaining that the sheet portion 110 of the insulation system of the liquefied gas storage tank according to an embodiment of the present invention includes two or more breathable insulation materials 111 having different densities.

In the insulation system 100 of a liquefied gas storage tank according to an embodiment of the present invention, breathable insulation 111 of different densities is installed according to the position of the tank body 10 to enable a smooth flow of the leaked liquefied gas. By doing so, the sheet part 110 can be formed.

Specifically, a breathable insulating material 111a having a relatively low density is installed on the side and lower surfaces of the tank body 10 for economic efficiency and rapid response when leakage of liquefied gas occurs, and the weight including the upper surface of the tank body 10 is included. A breathable insulating material 111b having a high density can be installed in the area affected by the leaked liquefied gas for smooth flow.

In this embodiment, the zone affected by the weight including the upper surface of the tank body 10 may be divided according to the cross-sectional shape of the tank body 10 .

When the cross-sectional shape of the tank body 10 is a quadrangle, the corresponding area may be the upper surface of the tank body 10 including both upper side edges of the tank body 10, as shown in FIG. When the body 10 has a cross-sectional shape of a pentagon or more, such as a pentagon or an octagon, the upper inclined surface is also affected by its own weight, so it may mean an area including the inclined surface.

The breathable insulating material 111a having a relatively low density may be fixedly installed through the stud 121 of a metal material or wood welded to the tank body 10 and the fastening member 123, and the installation height depends on the insulation performance. can be determined according to

Breathable insulator 111b having a high density, similar to the breathable insulator 111a having a low density, a stud 121 of a metal material or wood welded to the tank body 10 and a fastening member 123 through It may be fixedly installed, and the installation height may be calculated and determined according to the insulation performance as well as the weight of the insulation system 100 itself and the installation process.

In this embodiment, in the zone affected by the weight of the insulation system 100, in consideration of the weight of the insulation system 100 itself and the weight of the construction worker, a high-density breathable insulation 111b having a density of 60 kg/m 3 or more is used It may be desirable to be

Insulation system 100 of a liquefied gas storage tank according to an embodiment of the present invention, by forming the sheet portion 110 using two or more breathable insulators 111 having different densities, the insulation system 100 Regardless of the construction method of the construction method or the performance of the operator, it is possible to prevent in advance that the flow of the leaked liquefied gas is blocked by the compression of the breathable insulating material 111 at a specific position of the tank body 10, thereby, explosion Or it may have the effect of reducing the risk of fire.

On the other hand, when leakage of liquefied gas from the tank body 10 occurs, the pressure between the tank body 10 and the heat insulating part 130 increases, and the foamed foam constituting the heat insulating part 130 is exposed to a cryogenic environment. This contraction or relaxation causes a crack to be generated, and the heat insulating part 130 may be separated from the tank body 10 due to the crack metastasis.

In addition, even if the sheet portion 110 is fixed to the outer surface of the tank body 10, and the foam is sprayed and laminated on the sheet portion 110 by a designed thickness to form the heat insulating portion 130, the heat insulation portion 130 is affected by the pressure caused by the leaked liquefied gas or boil-off gas, so the rigidity of the foam sprayed and laminated on the seat unit 110 must be maintained.

5 is a view showing that a reinforcing layer 150 is further formed in the heat insulation system of a liquefied gas storage tank according to an embodiment of the present invention, and FIG. 6 is an enlarged perspective view of the fixing bracket of FIG. .

Referring to FIG. 5 , the insulation system 100 of a liquefied gas storage tank according to an embodiment of the present invention is a thermal insulation unit 130 having two or more layers by spraying and stacking foam on the sheet portion 110 . However, it may further include a reinforcing layer 150 for increasing the rigidity of the foam foamed on the seat portion (110).

In the present embodiment, the heat insulating unit 130 may include a primary insulating layer 131 formed on the sheet unit 110 and a secondary insulating layer 132 formed on the reinforcing layer 150 .

That is, a sheet portion 110 including a breathable heat insulating material 111 is installed on the outer surface of the tank body 10, and foam is sprayed and laminated on the sheet portion 110 to form a primary heat insulation layer 131, The reinforcing layer 150 in the form of a mesh is installed on the first heat insulating layer 131 , and the second heat insulating layer 132 can be formed by spraying foam again on the reinforcing layer 150 .

The primary thermal insulation layer 131 and the secondary thermal insulation layer 132 of this embodiment may be formed by spraying and stacking foam having the same density, or may be formed of the same material but have different densities.

The reinforcing layer 150 may serve as a reinforcement (crack arrester) that prevents cracks in the foam from occurring or progressing when the pressure rises due to leakage of liquefied gas from the tank body 10 serving as a primary barrier. there is.

The reinforcing layer 150 may be made of various materials such as steel, plastic, or fabric, and may be provided in the form of a mesh such as a chain or a net. there is.

In this embodiment, the reinforcing layer 150 may be fitted by the studs 121 installed on the tank body 10, and the studs 121 fix the breathable insulating material 111 to the tank body 10 and also , may serve to fix the reinforcing layer 150 in the form of a mesh.

In this case, the length of the stud 121 may be determined according to the height of the breathable insulating material 111 calculated according to the insulation performance and the installation height of the reinforcing layer 150 .

On the other hand, the insulation system 100 of the liquefied gas storage tank according to an embodiment of the present invention, as shown in FIG. 5, a fixing bracket coupled to the end of the stud 121 to fix the reinforcing layer 150 ( 160) may be further included.

As shown in FIG. 6 , the fixing bracket 160 has a central portion 161 having a cutout groove 160a so that the end of the stud 121 can be inserted therethrough, and the central portion 161 is elongated on both sides of the center. It may include a formed wing portion 163 .

The fixing bracket 160 of this embodiment may have a long and narrow rectangular shape in one direction or a thin and long bar shape, and at least the central part 161 in which the cut-out groove 160a is formed has a certain elasticity. can be formed.

That is, the fixing bracket 160 of this embodiment, similar to a button hole of clothes, can be provided so that the inner area of the cut-out groove 160a can be varied to some extent, as shown in FIG. As shown, by extending the cut-out groove 160a and passing the end of the stud 121 inside, it is possible to prevent separation from the stud 121 and to fix the reinforcing layer 150 .

Here, the end of the stud 121 may have an extended diameter to have a bolt head shape, or by coupling a separate nut or the like to the end of the stud 121, the fixing bracket 160 from the stud 121 Separation can be prevented more reliably.

The reinforcing layer 150 of this embodiment may be positioned at the end of the stud 121 by a fixing bracket 160 , and foamed due to leakage of liquefied gas between the tank body 10 and the heat insulating part 130 . It is possible to prevent in advance that the crack (crack) of the foam is generated or propagated.

In this embodiment, the material and the installation height of the reinforcing layer 150 may be changed in design according to the insulation performance analysis.

The present invention is a tank body and foam for accommodating liquefied gas inside by fixing the seat part to the outer surface of the tank body, and spraying and stacking foam such as polyurethane foam on the seat part by a designed thickness to form an insulating part. It is possible to prevent damage to the insulation system due to the difference in thermal expansion coefficient and maintain the insulation performance of the insulation system.

In addition, since the seat portion includes a breathable insulating material, the leaked liquefied gas can be moved in the entire outer surface of the tank body regardless of the leaking location of the liquefied gas, so damage to the insulation system due to leakage of liquefied gas and insulation It may have an advantageous effect of preventing performance degradation.

In addition, by using a breathable insulating material with different densities depending on the location of the tank body, it is possible to smoothly move the leaked liquefied gas regardless of the location of the tank body, and it is possible to respond flexibly to emergency situations caused by the leak of liquefied gas. , it can have the effect of reducing the risk of explosion or fire due to leakage of liquefied gas.

In addition, further comprising a fixing bracket for fixing the reinforcing layer and the reinforcing layer in the form of a mesh for increasing the rigidity of the foam foam foamed on the seat portion, the foam foam when the pressure rises due to leakage of liquefied gas between the tank body and the heat insulating portion It can have the effect of preventing in advance the occurrence of cracks or separation of the insulating part from the tank body.

The above description is merely illustrative of the technical idea of the present invention, and various modifications, changes, and substitutions are possible within the range that does not depart from the essential characteristics of the present invention by those of ordinary skill in the art to which the present invention pertains. will be. Accordingly, the embodiments disclosed in the present invention and the accompanying drawings are for explaining, not limiting, the technical spirit of the present invention, and the scope of the technical spirit of the present invention is not limited by these embodiments and the accompanying drawings . The protection scope of the present invention should be construed by the following claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present invention.

10: tank body
100: insulation system
110: seat portion
111: breathable insulation
113: impermeable layer
120: fixed part
130: insulation
140: protective layer (Protection coating layer)
150: reinforcing layer
160: fixed bracket

Claims (12)

As an insulation system of a liquefied gas storage tank for insulating the liquefied gas stored inside the tank body,
a seat portion fixedly installed on the tank body;
a heat insulating unit for forming a plurality of heat insulating layers by spraying and stacking foam on the sheet unit; and
Insulation system of a liquefied gas storage tank comprising a reinforcing layer in the form of a mesh provided between the plurality of heat insulation layers. The method of claim 1,
The insulation system of the liquefied gas storage tank further comprising a fixing part for fixing the sheet part and the reinforcing layer to the tank body. 3. The method of claim 2,
The fixing part,
a stud installed on the tank body; and
Insulation system of a liquefied gas storage tank including a fastening member coupled to the stud. 4. The method of claim 3,
The reinforcing layer is spaced apart from the tank body, and the insulation system of the liquefied gas storage tank is located at the end of the stud. 4. The method of claim 3,
The fixing part,
The insulation system of the liquefied gas storage tank further comprising a fixing bracket coupled to the end of the stud for fixing the position of the reinforcing layer. 6. The method of claim 5,
The fixing bracket is
a central portion having a cutout groove so that the end of the stud can be inserted therethrough; and
Insulation system of a liquefied gas storage tank including a pair of wings extending long on both sides around the central portion. 4. The method of claim 3,
The stud is a thermal insulation system of a liquefied gas storage tank provided with any one of a metal material, a composite material, or wood. 4. The method of claim 3,
The fixing portion further comprises a connecting member fixed to the outer surface of the tank body to install the stud to the tank body,
The stud is a thermal insulation system of a liquefied gas storage tank that is vertically installed on the outer surface of the tank body by the connecting member. 4. The method of claim 3,
The fastening member is a washer (washer) or a nut (nut) insulated system of the liquefied gas storage tank provided with any one. The method of claim 1,
Insulation system of the liquefied gas storage tank comprising the sheet portion breathable insulation. The method of claim 1,
The insulation system of the liquefied gas storage tank further comprising a protection coating layer applied on the insulation to improve the watertightness of the insulation and to prevent damage. A method of constructing an insulation system for a liquefied gas storage tank to insulate the liquefied gas stored inside the tank body, the method comprising:
installing a seat part on the outside of the tank body through a fixing part installed on the tank body; and
Comprising the step of forming a heat insulating portion by spraying and laminating the foam on the sheet portion,
In the step of forming the heat insulating part,
A method of constructing an insulation system for a liquefied gas storage tank by spraying and laminating foam on the sheet portion to form a plurality of insulation layers, and installing a reinforcing layer in the form of a mesh between the insulation layers.

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