KR102095427B1 - Insulation system for natural gas cargo of carrier and liquefied natural gas fuel tank - Google Patents

Abstract

The present invention minimizes the influence of the thermal load caused by the temperature difference caused by the internal cargo, thereby facilitating the use of the secondary membrane as a metal material, as well as the construction of the space insulation applied to the space occurring between the insulating layers Regarding the membrane insulation system of cryogenic liquefied gas cargo hold that can secure the soundness of a structure that minimizes the space heat loss using elasticity, the upper plywood of the secondary insulation layer is composed of a plurality of plywood stacked structures, and the upper ply The wood-side upper plywood seals the space where the gap insulation is installed, thereby preventing shrinkage deformation and ensuring load-bearing capacity, as well as minimizing heat transfer.

Description

Cryogenic liquefied gas cargo hold membrane type insulation system, and cryogenic liquefied gas carrier ship equipped with the membrane type insulation system {INSULATION SYSTEM FOR NATURAL GAS CARGO OF CARRIER AND LIQUEFIED NATURAL GAS FUEL TANK}

The present invention minimizes the influence of the thermal load caused by the temperature difference caused by the internal cargo, thereby facilitating the use of the secondary membrane as a metal material, as well as the construction of the space insulation applied to the space occurring between the insulating layers Regarding the membrane-type insulation system of a cryogenic liquefied gas cargo hold that can secure the soundness of a structure that minimizes space heat loss using elasticity, more specifically, the upper plywood of the secondary insulation layer is composed of a plurality of plywood stacked structures The upper plywood side upper plywood seals the space where the gap insulation is installed, preventing shrinkage deformation and securing load bearing capacity, as well as minimizing heat transfer as well as the membrane insulation system of the cryogenic liquefied gas cargo hold, and Cryogenic liquefied gas operation with membrane type insulation system It relates to the line.

In general, natural gas is transported in gaseous form through on-shore or offshore gas piping, or stored in an LNG carrier in the form of liquefied natural gas (hereinafter referred to as LNG) and transported to remote consumers. .

LNG is obtained by cooling natural gas to approximately -163 ° C at a very low temperature, and its volume is reduced to approximately 1/600 than that of natural gas in a gas state, so it is very suitable for long-distance transportation through the sea.

LNG carriers to load LNG and unload LNG to land demanders by operating the ocean, or LNG regasification vessels (RVs) that load LNG and fly to the sea to arrive at land demand destinations, regasify the stored LNG and unload it into natural gas. Has a storage tank that can withstand the cryogenic temperature of liquefied natural gas, that is, a cargo hold.

Recently, the demand for floating offshore structures such as LNG FPSO (floating, production, storage and offloading) or LNG floating storage and regasification unit (FSRU) is gradually increasing, and these floating offshore structures are also being used for LNG carriers and LNG RV. A cargo hold to be installed is provided.

LNG FPSO is a floating offshore structure that is used to liquefy the produced natural gas directly at sea and store it in a cargo hold and, if necessary, transfer the LNG stored in the cargo hold to an LNG carrier.

LNG FSRU is a floating offshore structure that stores LNG unloaded from an LNG carrier in a cargo space off the land and then vaporizes the LNG as needed to supply it to the land demand.

In this way, a cargo hold for storing LNG in a cryogenic state is installed in an offshore structure such as an LNG carrier, LNG RV, LNG FPSO, and LNG FSRU that transports or stores liquid cargo such as LNG at sea.

Cargo holds can be classified into independent tank type and membrane type depending on whether the load of the liquid cargo directly acts on the heat insulating material.

Usually, the membrane type cargo hold is divided into GTT NO96 type and TGZ Mark III type, and the independent tank type cargo hold is divided into MOSS type and IHI-SPB type.

Membrane type cargo holds have different insulation and structure depending on the type of special metal plate. GTT NO96 type uses a thin plate made of Invar (Invar-an alloy with a very small thermal expansion rate mainly composed of iron and nickel), and MARK III type is stainless Use a thin plate of material.

The insulation system of the conventional cryogenic liquefied gas cargo hold is as follows.

A conventional liquefied gas cargo hold insulation system includes a primary membrane and a secondary membrane made of 0.5 to 0.7 mm thick Invar steel; A primary insulating layer and a secondary insulating layer made of plywood and insulating material; An insulating layer fixing part for fixing the primary insulating layer and the secondary insulating layer; In addition, a membrane fixing part for fixing the primary membrane and the secondary membrane is provided.

1 is a conventional thermal insulation system for a liquefied gas cargo hold, an empty space (S) is generated upon shrinkage deformation of the heat insulating layer (10) due to heat load, and heat transfer and heat loss are generated through the empty space (S). It is a drawing to do.

The insulation system of the conventional liquefied gas cargo hold, as shown in Figure 1 (a), the insulating layer 10 is composed of the upper and lower plywood (11,12) and the insulating material 13, the insulating layer 10 and the insulating layer ( 10) Since the fiber-reinforced insulating material 20 without elasticity is installed therebetween, as shown in FIG. 1 (b), an empty space (or crevice) (S) occurs when the heat-load shrinks and deforms the insulating layer 10. In addition, heat transfer and heat loss occur through the empty space S, and of course, there is a problem in that the load bearing capacity is weakened due to the empty space S and thus safety cannot be secured.

Domestic Patent Publication No. 10-2000-0011347

An object of the present invention is to solve the above-mentioned problems, to provide a gap insulation (gap insulation) made of a mixture of a flexible insulating material at the boundary between the insulating layer and the insulating layer in order to fill or fill the empty space generated during shrinkage deformation due to heat load In addition, the upper plywood side upper plywood seals the space in which the gap insulation is installed, thereby preventing shrinkage deformation and ensuring load-bearing capacity as well as minimizing heat transfer.

In addition, the object of the present invention, in the case of a primary or / and secondary metal membrane, a corrugated or flat metal membrane can be freely applied, and a gap insulation is provided to generate empty gaps during shrinkage deformation due to thermal load. By filling the space, the insulating layer firmly supports the metal membrane without an empty space, so that the airtightness of the membrane can be easily secured.

In addition, the object of the present invention is provided with a gap insulation composed of a mixture of a stretchable heat insulating material and a reinforced heat insulating material capable of supporting a load, but the lower plywood of the secondary heat insulating layer is formed in a protruding form, and the gap insulation is supported on the protruding part, The lower plywood of the secondary insulating layer is constructed in a form supported by a mastic, so that the safety of the secondary membrane can be secured.

In addition, the object of the present invention, the primary and secondary insulating layers may be composed of a sandwich panel of a polyurethane foam and plywood or plywood and composite materials reinforced with glass fibers, installed in the upper surface of the secondary insulating layer A primary insulating layer fixing unit is provided, and the primary insulating layer fixing unit fixes a plurality of primary insulating layers at four corner points of the primary insulating layer, but the primary insulating layer fixing unit is in a form in which heat load does not affect the insulating layer. Can be placed.

In addition, the object of the present invention is not only to facilitate the use of a metal membrane that functions as a barrier by minimizing the influence of thermal loads caused by cryogenic cargo, and can be configured in a form that can be free of the load that the thermal insulation system is responsible for. By improving the upper plywood structure of the secondary insulation layer to fix the membrane capable of fixing the tongue, it reduces the processing time when manufacturing the insulation system, and covers the space between the insulation layers to further increase the insulation effect. have.

In order to achieve the above object, the present invention is provided with a membrane insulation system of a cryogenic liquefied gas cargo hold.

In the membrane insulation system of the cryogenic liquefied gas cargo hold of the present invention, a space in which a gap insulation is installed between the insulation layer and the insulation layer is formed, and the space is characterized in that the upper plywood layer on the upper plywood side of the insulation layer seals the space. do.

The heat insulating layer is a secondary heat insulating layer to insulate the cargo hold secondary; A secondary membrane installed on the secondary insulating layer; A primary insulating layer installed on the secondary membrane to primarily insulate the cargo hold; A primary membrane installed on the primary insulating layer; And a gap insulation to prevent heat transfer by filling an empty space generated during shrinkage deformation due to heat load, wherein the upper plywood of the secondary insulating layer is composed of a plurality of plywood stacked structures.

The membrane insulation system of the cryogenic liquefied gas cargo hold of the present invention includes a secondary membrane fixing member for fixing the secondary membrane; And a primary membrane fixing member for fixing the primary membrane. It further includes.

The lower plywood among the plywood stacked structures is formed on the heat insulating material of the secondary thermal insulation layer, and the upper plywood is installed on the lower plywood and has a membrane fixing member fixing groove for fixing the secondary membrane fixing member.

The gap insulation may include a secondary gap insulation provided at a boundary between the secondary thermal insulation layer and the secondary thermal insulation layer; And a primary gap insulation provided at a boundary between the primary thermal insulation layer and the primary thermal insulation layer.

The gap insulation may be composed of a mixture comprising a stretchable insulating material.

The gap insulation may have a structure in which a fiber-reinforced insulating material (for example, fiber-reinforced polyurethane foam) is formed in the middle, and elastic insulating materials are formed on both sides of the reinforcing insulating material.

The upper layer plywood may have a structure in which a plurality of upper layers of plywood are separated and installed, and the membrane fixing member fixing groove may be formed by the separation installation structure. That is, since the upper plywood and the lower plywood are configured in an attachment manner, the fixing member fixing grooves may be provided. As a result, since the post-processing of the membrane fixing member fixing groove is not required in the plywood, the constructability and structural safety are improved. It can be greatly improved.

The present invention includes a secondary insulating layer fixing unit for fixing the secondary insulating layer,

The secondary insulating layer fixing unit is fixed to the inner wall of the hull and is inserted into a through hole formed in a corner portion of the secondary insulating layer; A nut fastened to the stud bolt for fixing the secondary insulating layer; An elastic body fitted to the stud bolt and adjusting elasticity according to a degree of deformation of the inner wall of the hull; A compression fixing mold fitted to the stud bolt to support the elastic body to prevent local damage to the secondary heat insulating layer; A filling plug filled in the through hole and positioned on the compression fixing mold; And a reference plate for adjusting the height of the secondary insulating layer according to the degree of deformation of the inner wall of the hull.

The present invention includes a primary insulating layer fixing unit for fixing the primary insulating layer,

The primary insulating layer fixing unit is fixed to the upper center of the secondary insulating layer and a support bracket having a fastening groove; A stud bolt installed in the fastening groove and vertically installed to fix the secondary membrane; A support metal plate fitted into the stud bolt and supporting a step portion formed at an edge of the primary heat insulating layer; A spring washer fitted to the upper end of the stud bolt to fix the support metal plate; And a nut fastened to an upper end portion of the stud bolt.

The primary insulating layer fixing unit is located at a central portion of the secondary insulating layer and at four corner points (crossing points) of the primary insulating layer. Here, it is preferable to configure the primary insulating layer fixing unit so that it is not chamfered at four corner points, and the secondary insulating layer and the primary insulating layer are interspersed.

When the secondary thermal insulation layer is intended to adjust the thickness of the secondary thermal insulation layer upward, two thermal insulation layers may be stacked in the thickness direction, and the two thermal insulation layers may be alternately disposed.

As described above, the present invention is to provide a gap insulation (gap insulation) made of a flexible insulating material at the boundary between the insulating layer and the insulating layer in order to fill or fill the empty space that occurs during shrinkage deformation due to thermal load and upper plywood By closing the space where the gap insulation is installed, the upper plywood on the side prevents shrinkage deformation, secures a load-bearing force, and can minimize heat transfer.

In addition, in the case of the primary or / or secondary metal membrane, the present invention can freely apply a corrugated or flat metal membrane, and provide a gap insulation to provide an empty space generated during shrinkage deformation due to heat load. By filling, the insulating layer firmly supports the metal membrane without an empty space, thereby making it easy to secure the airtightness of the membrane.

In addition, the present invention is provided with a gap insulation composed of a mixture of a stretchable heat insulating material and a reinforced heat insulating material capable of supporting a load, but the lower plywood of the secondary heat insulating layer is formed in a protruding form, and the gap insulation is supported on the protruding part, and secondary By configuring the lower plywood of the heat insulating layer to be supported by a mastic, it is possible to secure the safety of the secondary membrane.

In addition, the present invention, the primary and secondary insulation layer may be composed of a sandwich panel of a polyurethane foam and plywood or plywood and composite material reinforced with glass fiber, the primary installed among the upper surface of the secondary insulation layer An insulating layer fixing unit is provided, and the primary insulating layer fixing unit fixes a plurality of primary insulating layers at four corner points of the primary insulating layer, but the primary insulating layer fixing unit can be arranged in a form in which heat load does not affect the insulating layer. have.

In addition, the present invention not only facilitates the use of a metal membrane that functions as a barrier by minimizing the influence of thermal loads caused by cryogenic cargo, but also can be configured in a form that can be free of the load that the thermal insulation system is responsible for. By improving the upper plywood structure of the secondary insulating layer for fixing the fixable tongue, it is possible to further increase the insulating effect by reducing the processing time when manufacturing the insulating system and covering the space between the insulating layers.

1 is a view of a conventional liquefied gas cargo hold insulation system, in which a heat insulating material is installed between the heat insulating layer and the heat insulating layer. Drawing showing what to do
Figure 2 is a perspective view showing a membrane insulation system of a cryogenic liquefied gas cargo hold according to the present invention
Figure 3 is a longitudinal cross-sectional view showing a membrane insulation system of a cryogenic liquefied gas cargo hold according to the present invention
4 is a perspective view of a plurality of secondary insulation layers installed
Figure 5 is a perspective view of the gap insulation is installed at the boundary between the secondary insulating layer
Figure 6 is a perspective view showing the gap insulation and the upper plywood installed on the secondary insulating layer
Figure 7 is a plan view of Figure 6
8 is a perspective view of the secondary membrane installed on the secondary insulation layer
9 is a perspective view of the primary insulation layer is installed after the secondary membrane is installed on top of the secondary insulation layer
Figure 10 is a longitudinal cross-sectional view showing the gap insulation of the present invention, (a) is a gap insulation in which a thin elastic insulation is formed on both sides of a thick fiber reinforced insulation, (b) is a gap in which a thick elastic insulation is formed on both sides of the thin fiber reinforced insulation Insulation
11 is to install a gap insulation at the boundary between the heat insulation layer and the heat insulation layer, by filling or filling the gap insulation elastic insulation material generated during shrinkage deformation due to heat load, to minimize the heat transfer and heat loss generated through the empty space And a diagram for explaining minimizing deformation due to temperature difference
Figure 12 is a longitudinal cross-sectional view for explaining the secondary insulating layer fixing unit
13 is a longitudinal sectional view for explaining a primary insulating layer fixing unit

Hereinafter, with reference to the accompanying drawings will be described the membrane insulation system of the cryogenic liquefied gas cargo hold of the present invention.

Figure 2 is a perspective view showing a membrane insulation system of a cryogenic liquefied gas cargo hold according to the present invention, Figure 3 is a longitudinal cross-sectional view showing a membrane insulation system of a cryogenic liquefied gas hold according to the present invention, Figure 4 is a plurality of secondary A perspective view of an insulating layer installed, FIG. 5 is a perspective view showing a gap insulation at a boundary between the second insulating layers, FIG. 6 is a perspective view showing a gap insulation and an upper plywood installed on the second insulating layer, and FIG. 7 is a plan view of FIG. 6, And FIG. 8 is a perspective view of the secondary membrane installed on the secondary insulating layer.

Referring to the above drawings, the membrane insulation system of the cryogenic liquefied gas cargo hold according to the present invention is formed with a space in which a gap insulation is installed between the insulation layer and the insulation layer, and the space is the upper plywood side of the upper plywood side of the insulation layer. It is characterized by closing the space.

The insulating layer may include a second insulating layer 210 to insulate the cargo hold secondarily; A secondary membrane 220 installed on the secondary insulating layer 210; A primary thermal insulation layer 110 installed on the secondary membrane 220 to primarily insulate the cargo hold; A primary membrane 120 installed on the primary insulating layer 110; And a gap insulation (130,230) for preventing heat transfer by filling an empty space generated during shrinkage deformation due to heat load, wherein the upper plywood of the secondary insulating layer may be composed of a plurality of plywood stacked structures.

The membrane insulation system of the cryogenic liquefied gas cargo hold according to the present invention includes a secondary membrane fixing member 240 for fixing the secondary membrane 220; And a primary membrane fixing member 140 for fixing the primary membrane 120.

In more detail, the secondary insulating layer 210 is fixedly installed on the inner wall 1 of the hull and functions to insulate the cargo hold secondaryly.

The secondary insulating layer 210 is installed on the inner wall 1 of the hull by maintaining a certain distance from the inner wall 1 of the hull by the mastic 2, and is fixedly installed through the second insulating layer fixing unit 250, which will be described later.

As illustrated in FIG. 4, a plurality of secondary heat insulating layers 210 are arranged to maintain a constant distance (D) from each other.

The secondary insulating layer 210 is formed with a seating groove 210a at the center of the upper surface and a through hole H1 at the corner.

The secondary insulating layer 210 may be composed of an upper plywood 211 and a lower plywood 212 and an insulating material 213 formed therebetween.

The upper plywood 211 and the lower plywood 212 may be adhered to the upper and lower surfaces of the heat insulating material 213. Reinforced polyurethane foam may be used as the insulating material 213.

The lower plywood 212 may protrude more than the heat insulating material 213. In a state in which a plurality of secondary heat insulating layers 210 are successively installed, the lower plywood 212 of the secondary heat insulating layer 210 has end portions adjacent to each other. Or may be arranged to be close, the lower plywood 212 is supported on the end portion of the secondary gap insulation 230, which will be described later in the above-described predetermined interval (D) is installed.

The upper plywood 211 of the secondary heat insulating layer 210 may be formed of a plurality of plywood stacked structures.

For example, the upper plywood 211 may be composed of a lower plywood 211a and an upper plywood 211b, and the lower plywood 211a is directly connected to the insulating material 213 of the secondary insulating layer 210. It can be attached or glued.

In addition, the upper plywood 211b is installed on the lower plywood 211a and may include a membrane fixing member groove (G1) for fixing the secondary membrane fixing member 240.

The upper plywood 211b is a structure in which a plurality (for example, three) are separately installed on the upper surface of the lower plywood 211a, and the membrane is formed by a separate installation structure, that is, a structure installed at a predetermined interval. Fixing member fixing groove (G1) may be formed.

Membrane fixing member fixing groove (G1) may be formed of a "L", etc., the membrane fixing member fixing groove (G1) of the secondary membrane fixing member 240, the lower bent portion (240a) of the configuration is fitted to fit It can be (see Figures 3 and 6).

In addition, the upper plywood 211b may be disposed to cover the space between the secondary gap insulation 230 and the insulating material 231 of the secondary insulating layer 210, that is, to seal the space to block heat transfer.

That is, the end of the upper plywood 211b is attached to the upper surface of the reinforced insulating material (for example, fiber-reinforced polyurethane foam) and sealed so that no empty space is formed between the second insulating layer 210 and the second insulating layer 210. By doing so, heat transfer can be effectively blocked.

The secondary membrane 220 is installed on the secondary insulating layer 210, and both ends of the secondary membrane 220 are fixed by welding to the secondary membrane fixing member 240.

In other words, the lower bent portion 240a of the secondary membrane fixing member 240 is fitted and fixed in the membrane fixing member fixing groove G1, and the upper end of the secondary membrane fixing member 240 is the primary insulating layer 110 It is configured to fit into the insertion groove (G2) formed on the lower surface of the, both ends of the secondary membrane 220 is fixed by welding to the secondary membrane fixing member (secondary tongue) 240.

The secondary membrane 220 may be formed of 0.5 to 0.7 mm thick Invar steel, but is not limited thereto.

The secondary membrane 220 is not limited to a flat metal material barrier, and a metal material barrier having a corrugated portion may be used.

The primary thermal insulation layer 110 is installed on the secondary membrane 220 to primarily insulate the cargo hold.

The primary insulating layer 110 is a single-layer structure in which a plurality of plywoods are laminated in a thickness direction, or a plurality of plywoods and insulating materials (for example, glass wool, density 40 to 50 kg / ㎥ low density polyurethane foam material) It may be composed of any one of a composite structure consisting of a) insulation.

In addition, as shown in FIGS. 3 and 13, the primary thermal insulation layer 110 includes an upper plywood 111 and a lower plywood 112, and an upper plywood 111 and a lower plywood 112. Between the insulation (for example, reinforced polyurethane foam) 113 may be formed, the middle of the insulation 113 may be provided with a middle plywood (114).

The upper plywood 111 may be composed of an upper plywood 111a and a lower plywood 111b.

The lower plywood 112 may protrude more than the heat insulating material 113 as shown in FIGS. 9 and 13, but may be formed at the same position as the heat insulating material, although not shown in the drawings.

The primary membrane 120 is installed on the primary insulating layer 110, and both ends of the primary membrane 120 are fixed by welding to the primary membrane fixing member 140.

In other words, the lower bent portion 140a of the primary membrane fixing member 140 is fitted and fixed in the membrane fixing member fixing groove G3, and both ends of the primary membrane 120 are attached to the primary membrane fixing member 140. It is fixed by welding.

The primary membrane 120 may be made of 0.5 to 0.7 mm thick Invar steel, but is not limited thereto.

As shown in FIG. 2, the gap insulation 130 and 230 is a secondary gap insulation 230 installed at a boundary between the secondary insulation layer 210 and the secondary insulation layer 210, and the primary insulation layer 110 and the primary insulation layer 110 It includes a primary gap insulation 130 installed at the boundary between the insulating layer 110.

The primary and secondary gap insulations 130 and 230 may be composed of a mixture comprising a stretchable insulating material. That is, the primary and secondary gap insulations 130 and 230 may have a structure in which a reinforced insulating material (for example, fiber-reinforced polyurethane foam) is formed in the middle, and a stretchable insulating material is formed on both sides of the reinforced insulating material.

In the primary and secondary gap insulations 130 and 230, the reinforced insulating material functions to support the load, and the elastic insulating materials such as glass wool, melamine foam, and soft polyurethane foam are compressed. It can be installed in a certain interval (D).

The primary and secondary gap insulations 130 and 230 of FIG. 10 (a) are thin stretchable insulations formed on both sides of the thick fiber reinforced insulation, and the primary and secondary gap insulations 130 and 230 of FIG. 10 (b) are thin fibers Thick elastic insulation is formed on both sides of the reinforced insulation, but is not limited thereto, and may be variously changed.

11, by installing a gap insulation at the boundary between the heat insulating layer and the heat insulating layer, and filling or filling the empty space generated during shrinkage deformation due to heat load, the insulating material of the gap insulation minimizes heat loss generated through the empty space, It is a diagram showing that deformation due to temperature difference is minimized.

Referring to FIG. 11, the gap insulation will be described in more detail. Since the secondary gap insulation 230 and the primary gap insulation 130 have the same structure, only the secondary gap insulation 230 will be described.

As shown in (a) of FIG. 11, a predetermined gap D is formed between the heat insulating layer and the heat insulating layer, and a secondary gap insulation 230 is inserted into the gap D. At this time, the elastic insulating material of the secondary gap insulation 230 is inserted into a predetermined interval (D) in a compressed state.

Thereafter, as shown in FIG. 11 (b), an empty space S is generated when the shrinkage is deformed by thermal load. At this time, as shown in FIG. 11 (c), when the shrinkage is deformed by thermal load. As the elastic insulating material of the primary gap insulation 230 is restored to its original state, it fills or fills the empty space.

Furthermore, as shown in FIG. 11D, the upper plywood side upper plywood 211b of the secondary thermal insulation layer 210 has a space between the secondary thermal insulation layer 210 and the secondary gap insulation 230. By sealing the heat loss can be effectively prevented during shrinkage deformation due to heat load.

By this principle, by providing a gap insulation (gap insulation) made of a flexible insulating material in the boundary (space portion) between the insulating layer 210 and the insulating layer 210, heat transfer generated through the empty space (S) and Heat loss can be minimized and shrinkage deformation due to temperature difference can be minimized. In other words, heat transfer through the air in the empty space S may solve the problem of heat loss.

In addition, by providing a gap insulation by filling or filling an empty space that occurs during shrinkage deformation due to heat load, the insulating layer supports a metal membrane without an empty space, so that the membrane can be easily sealed to secure safety, and is used for cryogenic cargo. By minimizing the influence of the thermal load caused by this, it is possible not only to facilitate the use of the metal membrane functioning as a barrier, but also to be configured to be free from the load required by the thermal insulation system. In particular, in the case of the primary or / and secondary metal membrane, a corrugated or flat metal membrane can be freely applied, and the intensity of the secondary and primary membranes 220 and 120 can be effectively reduced.

In addition, FIG. 12 is a longitudinal sectional view for explaining the secondary insulating layer fixing unit.

As shown in FIG. 12, the membrane-type insulation system of the cryogenic liquefied gas cargo hold of the present invention includes a secondary insulation layer fixing unit 250 for fixing the secondary insulation layer 210.

The secondary insulating layer fixing unit 250 is fixed to the inner wall 1 of the hull and is inserted into a through hole H1 formed in a corner portion of the secondary insulating layer 210, a stud bolt 251; A nut 252 fastened to the stud bolt 251 for fixing the secondary insulating layer 210; An elastic body 253 fitted to the stud bolt 251 and adjusting elasticity according to the degree of deformation of the inner wall 1 of the hull of the secondary heat insulating layer 210; A compression fixing mold 254 fitted to the stud bolt 251 to support the elastic body 253; A filling plug 255 filled in the through hole H1 and positioned on the upper portion of the compression fixing mold 254; And a reference plate 256 for height adjustment according to the degree of deformation of the inner wall 1 of the hull.

The lower end of the stud bolt 251 may be fixed to the inner wall 1 of the hull or fixed by a method of coupling to a socket (not shown).

The nut 252 is fastened to the stud bolt 251 in order to fix the secondary insulating layer 210.

The elastic spring (washer spring) 253 is fitted in the middle of the stud bolt 251, it may be configured to adjust the elasticity according to the degree of deformation of the secondary insulating layer 210 during shrink deformation.

In order to adjust the elasticity, the elastic body 253 may be replaced with three or five stages.

The compression fixing mold 254 is fitted to the stud bolt 251 to support the elastic body 253, and high-density PUF, compressed wood, or the like may be used. A plate washer 257 may be installed under the compression fixing mold 254.

A reference wedge 256 is fixed to the inner wall 1 of the hull, and a stud bolt 251 is vertically fixed to the reference plate 256.

The reference plate 256 is configured to adjust the height according to the degree of deformation of the inner wall 1 of the hull.

The filling plug 255 is installed on the upper portion of the compression fixing mold 254, and the filling plug 255 fills the inside of the through hole H1 in which the stud bolt 251 is installed and prevents damage to the secondary insulating layer 210. Function.

In addition, Figure 13 is a longitudinal cross-sectional view for explaining the primary insulating layer fixing unit.

As shown in FIG. 13, the membrane type insulation system of the cryogenic liquefied gas cargo hold of the present invention includes a primary insulation layer fixing unit 150 for fixing the primary insulation layer 110.

The primary insulating layer fixing unit 150 is located at a central portion of the secondary insulating layer 210 and at four corner points (crossing points) of the primary insulating layer 110. Here, the intersection of the four corners is chamfered so that the primary insulating layer fixing unit 150 is not interfered, and the secondary insulating layer 210 and the primary insulating layer 110 are interspersed.

Since the primary insulating layer fixing unit 150 is located at the central portion of the secondary insulating layer 210 and the four corners of the primary insulating layer 110, the heat shrinks and expands from the four sides to the center based on the secondary insulating layer, so the stress is By canceling each other, the load is not concentrated in the primary insulating layer fixing unit 150, so that structural stability as well as thermal deformation can be effectively prevented.

The primary insulating layer fixing unit 150 is fixed to the upper center of the secondary insulating layer 210 and has a fastening groove 151a, a supporting bracket 151; A stud bolt 152 fastened in the fastening groove 151a and vertically installed to fix the secondary membrane 220; A support metal plate 153 fitted in the stud bolt 152 and supporting the stepped portion 110a formed at the corner of the primary heat insulating layer 110; A spring washer 154 fitted to the upper end of the stud bolt 152 to fix the support metal plate 153; And a nut 155 fastened to the upper end of the stud bolt 152.

The filling plug 156 is filled in the through hole H2. The support bracket 151 may be fixedly installed on the upper surface of the secondary insulating layer 210 by rivets (R) or bolts. Here, the through-hole H2 means a space formed in four corners to install the primary fixing unit.

The filling plug 156 may be formed with a reinforced heat insulating material 156a of fiber-reinforced urethane inside, and a stretchable heat insulating material 156b may be formed outside the reinforced heat insulating material 156a.

As described above, the present invention is to provide a gap insulation (gap insulation) made of a flexible insulating material at the boundary between the insulating layer and the insulating layer in order to fill or fill the empty space that occurs during shrinkage deformation due to thermal load and upper plywood By closing the space where the gap insulation is installed, the upper upper plywood prevents shrinkage deformation, secures a load-bearing force, and minimizes heat transfer.

In addition, in the case of the primary or / or secondary metal membrane, the present invention can freely apply a corrugated or flat metal membrane, and provide a gap insulation to provide an empty space generated during shrinkage deformation due to heat load. By filling, the insulating layer firmly supports the metal membrane without an empty space, thereby making it easy to secure the airtightness of the membrane.

In addition, the present invention is provided with a gap insulation composed of a mixture of a stretchable heat insulating material and a reinforced heat insulating material capable of supporting a load, but the lower plywood of the secondary heat insulating layer is formed in a protruding form, and the gap insulation is supported on the protruding part, and secondary By configuring the lower plywood of the heat insulating layer to be supported by a mastic, it is possible to secure the safety of the secondary membrane.

In addition, the present invention, the primary and secondary insulation layer may be composed of a sandwich panel of a polyurethane foam and plywood or plywood and composite material reinforced with glass fiber, the primary installed among the upper surface of the secondary insulation layer An insulating layer fixing unit is provided, and the primary insulating layer fixing unit fixes a plurality of primary insulating layers at four corner points of the primary insulating layer, but the primary insulating layer fixing unit can be arranged in a form in which heat load does not affect the insulating layer. have.

In addition, the present invention not only facilitates the use of a metal membrane that functions as a barrier by minimizing the effect of thermal loads caused by cryogenic cargo, but also can be configured in a form that can be free of the load that the thermal insulation system is responsible for. By improving the upper plywood structure of the secondary heat insulating layer for fixing the fixable tong, it is possible to further increase the heat insulating effect by reducing the processing time when manufacturing the heat insulating system and covering the space between the heat insulating layers.

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

For example, in the description of the present invention, the primary insulating layer and the secondary insulating layer are divided into parts that are respectively installed on the inner wall of the hull and parts that contact the liquefied gas. Depending on the conditions, it can be configured with anything other than two stages.

In addition, the expressions of upper (upper) and lower (lower), and primary and secondary are arbitrarily set for convenience of explanation, and may be reversed depending on the location and viewing direction due to the characteristics of the cargo hold, and the thickness of each component. And size is not limited to this, of course, it can be changed according to the design conditions.

In this embodiment, the primary insulating layer fixing unit and the secondary insulating layer fixing unit are shown as an example, but are not limited thereto. In the case of the primary or / and secondary metal membrane, depending on the corrugated or flat metal membrane, It can be changed in various configurations.

1: hull inner wall
2: Mastic
110: primary insulating layer
120: primary membrane
130: 1st gap insulation
140: primary membrane fixing member
140a: lower bending part of the primary membrane fixing member
150: primary insulating layer fixing unit
210: secondary insulating layer
211: upper plywood
211a: Lower plywood
211b: upper plywood
212: lower plywood
213: insulation
220: secondary membrane
230: 2nd gap insulation
240: secondary membrane fixing member
240a: lower bend of the secondary membrane fixing member
250: secondary insulation layer fixing unit
D: regular interval
H1: Through hole
G1: Membrane fixing member fixing groove
G2: Insertion groove
G3: Membrane fixing member fixing groove
S: Empty space generated when shrinkage deformation due to heat load

Claims (8)

An insulating layer provided in a sandwich panel form including an insulating material provided with a reinforced polyurethane foam and an upper plywood adhered to the upper portion of the insulating material; And
Gap insulation is installed in the space between the heat insulating layer adjacent to each other,
The upper plywood is composed of a plurality of plywood stacked structures, including a lower plywood and an upper plywood stacked thereon.
Membrane insulation system of a cryogenic liquefied gas cargo hold, characterized in that the upper plywood of the insulation layer adjacent to each other is disposed in close contact with each other, and the space between the insulation layers adjacent to each other is sealed. The method according to claim 1,
The lower plywood has the same cross-sectional area as the insulation,
The upper layer plywood has a larger cross-sectional area than the lower layer plywood so as to cover the upper portion of the gap insulation membrane insulation system of a cryogenic liquefied gas cargo hold. The method according to claim 1,
Further comprising a membrane installed on top of the heat insulating layer,
The upper layer plywood seals the space between the insulating layers, so that the insulating layer continuously supports the lower portion of the membrane without an empty space. The method according to claim 3,
Further comprising a membrane fixing member fixed to the upper plywood of the heat insulating layer to fix the membrane,
The upper layer plywood is installed by being separated and installed at regular intervals on the upper surface of the lower layer plywood, so that a fixing groove in which the membrane fixing member is fixed is formed at intervals between the plurality of upper layer plywoods. Membrane insulation system for liquefied gas cargo holds. delete The method according to claim 1,
The gap insulation is a membrane-type insulation system of a cryogenic liquefied gas cargo hold, characterized in that a fiber-reinforced insulation is formed in the middle, and a stretchable insulation is formed on both sides of the fiber-reinforced insulation. The method according to claim 6,
The upper layer of plywood is a membrane-type insulation system of a cryogenic liquefied gas cargo hold, characterized in that the end is attached to the upper surface of the fiber reinforced insulation. A cryogenic liquefied gas carrier comprising the membrane type insulation system according to any one of claims 1 to 4, 6, and 7.

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