KR101644350B1 - Cargo barrier structure - Google Patents

Abstract

A cargo hold barrier structure is disclosed. A cargo hold barrier structure according to an embodiment of the present invention includes an upper heat insulating board disposed between a primary barrier and a secondary barrier; And a lower insulation board disposed between the upper portion of the inner wall of the hull and the secondary barrier, wherein the lower insulation board has a stud bolt protruding into the upper hole of the upper insulation board to be used for coupling with the upper insulation board, The hole is provided with a heat-insulated filler filled with gas for blocking heat transfer.

Description

Cargo barrier structure {CARGO BARRIER STRUCTURE}

The present invention relates to a cargo hold barrier structure.

Thermal insulation boards of ship holding cisterns containing cryogenic fluids (for example, liquefied natural gas (LNG)) are installed at regular intervals above the inner walls of the hull. Here, the upper and lower heat insulating boards may be made of a plywood protective plate and a heat insulating member made of reinforced polyurethane foam (R-PUF) at the lower part thereof.

On the four corners of the upper insulation board, a circular inner hole is machined. The washer and the nut are inserted through the corresponding inner hole and fastened to the stud bolt installed on the upper part of the lower heat insulating board. At this time, a plug member made of, for example, a polyurethane foam, an EPS foam (Expandable Polystyrene Foam) or the like is inserted into the inner hole, and the upper end is closed by a plug of a plywood material. Among them, the insulation performance of PU foam is superior to that of EPS foam, but it is expensive, and PU dust is generated during installation, which can adversely affect workers' health. Therefore, a plug member made of an EPS foam is widely used, but the heat insulating performance is lower than that of a plug member made of a PU foam material. As a related technology, refer to Korean Patent Laid-Open No. 10-2013-0099900 (published on Sep. 19, 2013).

Korean Patent Laid-Open No. 10-2013-0099900 (published on September 20, 2013)

The embodiment of the present invention is to provide a cargo barrier structure capable of effectively shielding heat transfer by providing an insulative filler filled with a gas having a thermal conductivity higher than that of nitrogen in the inner hole formed in the heat insulating board.

The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the description of the claims.

According to an aspect of the present invention, there is provided an upper insulating board disposed between a primary barrier and a secondary barrier; And a lower insulation board disposed between the upper portion of the inner wall of the hull and the secondary barrier, wherein the lower insulation board has a stud bolt protruding into the upper hole of the upper insulation board to be used for coupling with the upper insulation board And the inner hole is provided with a heat insulating filler filled with gas for interrupting heat transmission.

The gas may have a higher thermal conductivity than nitrogen.

The gas may comprise any one of helium, neon, argon, krypton, xenon, radon, HFC-245fa, HCFC-141b, cyclopentane and carbon dioxide.

The heat-insulating filler can be manufactured in the form of a closed container made of a metal material.

The heat insulating filler includes a front portion close to the cryogenic fluid and a rear portion closer to the inner wall of the hull than the front portion. The metal tape is attached to the inner surface of the front portion , The inner surface of the front portion can be polished.

A plug member made of a foam material may be inserted into the space between the stud bolt and the heat-insulating filler.

 The lower heat insulation board may form an inner hole coupled to the stud bolt fixed to the inner wall of the hull, and the heat insulating filler may further be installed in the inner hole of the lower heat insulation board.

According to an embodiment of the present invention, the heat-transfer can be effectively blocked by providing a heat-insulating filler filled in the inner hole formed in the heat-insulating board with a gas having a thermal conductivity higher than nitrogen.

1 is a perspective view of a cargo hold barrier structure according to an embodiment of the present invention.
FIG. 2 is a perspective view illustrating a configuration in which a lower insulation board is installed on a corner portion and a flat portion of the barrier structure shown in FIG. 1. FIG.
3 is a cross-sectional view illustrating a coupling relationship between the lower heat insulating board and the inner wall of the hull shown in FIG.
FIG. 4 is an exploded perspective view illustrating a state in which a secondary barrier is installed on the upper part of the lower heat-insulating board shown in FIG. 2. FIG.
FIG. 5 is a cross-sectional view illustrating a coupling relationship between the upper and lower insulation boards shown in FIG. 1. FIG.
FIG. 6 is a cross-sectional view illustrating a state in which the barrier structure of FIG. 5 is reversed and an insulating filler is installed in an inner hole of the upper heat insulating member.
FIG. 7 is a cross-sectional view showing a state in which a metal tape is attached to the heat insulating filler of FIG. 6;
8 is a cross-sectional view showing a state in which a plug member is inserted between the heat insulating filler and the stud bolt shown in FIG.
FIG. 9 illustrates a shape of a cargo hold to which the heat insulating filler shown in FIGS. 3 and 6 is applied.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The embodiments described below are provided by way of example so that those skilled in the art will be able to fully understand the spirit of the present invention. The present invention is not limited to the embodiments described below, but may be embodied in other forms. In order to clearly explain the present invention, parts not related to the description are omitted from the drawings, and the width, length, thickness, etc. of the components may be exaggerated for convenience. Like reference numerals designate like elements throughout the specification.

Referring to Figures 1 and 2, a barrier structure of a cargo hold storing a cryogenic fluid (e.g., liquefied natural gas (LNG)) according to an embodiment of the present invention is installed in the flat portion and the corner portion. The barrier structure provided in the flat part of the cargo hold is formed by a lower insulation board 110, a secondary barrier 120, an upper insulation board 130, a primary barrier 140 and an insulation filler 300 (see FIGS. 3 and 6) .

The lower insulation board 110 may be arranged in parallel with the upper portion of the inner wall 2 of the hull of the cargo hold and the lower protection plate 111, the lower thermal insulation member 112 and the lower auxiliary panel 113 may be laminated. A plurality of lower insulation board 110 may be integrally formed and arranged on the inner wall of the cargo hold. The lower insulating board 110 has a predetermined thickness, and may be formed in a square shape having a size of 1 m x 1 m (1: 1 ratio), for example. A filling member such as a glass wool may be inserted into the space formed between the lower heat insulating boards 110. However, the filling member may be omitted when the neighboring lower heat insulating boards 110 are arranged closely to each other or when the lower heat insulating boards 110 are closely bundled to be integrally manufactured.

The lower protection plate 111 is fixed to the inner wall of the hull 2 and can be made of, for example, a plywood. The lower heat insulating member 112 is disposed on the lower protective plate 111 and is made of polyurethane foam (PUF), reinforced polyurethane foam (RPUF, Reinforced PUF) or the like to protect the hull from the cryogenic fluid . The lower heat insulating member 112 may be bonded to the upper portion of the lower protective plate 111 by an adhesive (e.g., glue or the like).

The lower sub-panel 113 may be provided with a strip member 114 in the horizontal and vertical directions in the groove formed in the upper portion. The lower sub-panel 113 may be made of plywood or the like. The stud bolts 211 may be vertically fixed to the fixing pieces 210 provided on the lower sub-panel 113. As another example, if a fixing hole is formed in the fixing piece 210, the stud bolt 211 may be screwed into the fixing hole. The fixing piece 210 may be made of a metal material including, for example, stainless steel or the like. The fixing piece 210 may be coupled to the coupling groove 113a formed in the lower sub-panel 113 and fixed by a fastening member R1 such as a rivet or the like. The fixing piece 210 may be formed in a square shape, a circular shape, or the like.

3, the lower insulating board 110 may be fixed to the inner wall 2 of the ship by a mastic 3, a stud bolt 4, or the like. The stud bolts 4 are vertically fixed to the inner wall 2 of the hull and fit into the inner holes 110a formed in the lower heat insulating board 110. [ The lower portion of the stud bolt 4 can be welded to the inner wall 2 of the hull. The washer 5 fastened to the stud bolt 4 is supported by the lower protective plate 111 and the nut 6 is fastened to the upper portion of the washer 5 and can be pressed downward. A heat insulating filler 300 to be described later may be installed in the inner hole 110a of the lower heat insulating board 110 provided with the stud bolts 4. However, a plug member of a conventional foam material may be disposed in the inner hole 110a of the lower heat insulating board 110. [ The upper end of the inner hole 110a formed in the lower heat insulating board 110 may be covered by a cap 115. [ The heat insulating filler 300 will be described together in FIG.

4, the secondary barrier 120 forms a through-hole H1 at an interval set to be coupled to the stud bolt 211, and is installed on the upper portion of the lower sub-panel 113. As shown in FIG. The secondary barrier 120 can be installed simply and efficiently. The secondary barrier 120 is disposed across the lower insulating boards 110 to cover a space between two or more neighboring lower insulating boards 110. The secondary barrier 120 forms a curved portion 120a having a curved shape in a downward direction, and can expand and contract to effectively cope with thermal stress caused by the cryogenic fluid.

The periphery of the through hole H1 of the secondary barrier 120 can be welded (W, see Fig. 5) to the fixing piece 210 in a circular welding manner. The periphery of the neighboring secondary barrier can be welded so that a portion thereof overlaps with the upper portion of the strip member 114. [ For example, various welding methods such as lap welding, butt welding, laser welding, and plasma welding can be used. The secondary barrier 120 may be composed of a plurality of sheets made of a metal material such as stainless steel, aluminum, brass, zinc, or the like. As another example, a composite sheet made of a metal sheet and a fiber reinforced composite material may be provided.

1 and 5, the upper insulation board 130 is interposed between the secondary barrier 120 and the primary barrier 140 and includes an upper protection plate 131 and a lower upper insulation member 132 . The upper protection plate 131 may be made of a material such as plywood. The upper protection plate 131 may be provided with a strip member 160 in the horizontal and vertical directions in the groove formed in the upper portion. The upper heat insulating member 132 may be made of a polyurethane foam material, a reinforced polyurethane foam, or the like to protect the hull from the cryogenic fluid.

The upper insulating board 130 can be efficiently installed so as to be in close contact with the upper portion of the secondary barrier 120 in such a manner that the upper insulating board 130 is coupled with the stud bolts 211 on the lower insulating board 110. The upper insulating boards 130 may be fabricated and arranged to have the same size and shape. The upper insulating board 130 may have a rectangular shape corresponding to two or more lower insulating boards 110 and may be disposed side by side above the secondary walls 120. That is, the upper insulating board 130 may cover at least two lower insulating boards 110. The upper insulating board 130 may be in contact with a side surface of another adjacent upper insulating board 130 to form an interface. The interface formed between the upper heat insulating boards 130 may coincide with the interface formed between the lower lower heat insulating boards 110.

Conventionally, a connection board is inserted between the upper insulation boards to connect the upper insulation boards. However, through the embodiment of the present invention, the connection between the upper insulating boards 130 can be performed without a connecting board, so that a simple barrier installation work can be performed.

Conventionally, an anchor plate is inserted into a groove formed at the upper end of the upper heat insulating board, and one of both ends of the anchor plate is fixed and the upper insulating board is bonded to each other in such a manner that the other upper insulating board is pressed. However, according to the embodiment of the present invention described above, it is not necessary to use a separate member for connecting the upper heat insulating boards 130, and it is possible to reduce the cost due to the operation time and the member production, .

The upper insulating board 130 includes an upper auxiliary panel 134 interposed between the upper insulating member 132 and the secondary barrier 120 and a lower auxiliary panel 134 interposed between the upper auxiliary panel 134 and the secondary barrier 120, And an impact absorbing layer 133 that protects the cargo barrier wall from sloshing impact caused by the liquefied gas stored therein. The shock absorbing layer 133 may be omitted in another example. The upper sub-panel 134 may be made of plywood or the like. The shock absorbing layer 133 may be made of, for example, melamine foam as a foam material. Melamine foam is an open type foam based on amino resin type melamine resin, which not only absorbs impact but also has excellent heat insulation performance. However, the present invention is not limited to this, and the shock absorbing layer 133 may be made of various materials capable of protecting the cargo barrier from the sloshing shock caused by the liquefied gas stored in the cargo hold.

The washer 212 and the nut 213 inserted through the inner hole 130a are inserted into the impact absorbing layer 130a through the inner hole 130a, 133 and through holes of the upper sub-panel 134 to the stud bolts 211 protruding toward the inner hole 130a. At this time, the washer 212 presses the upper sub-panel 134 by tightening the nut 213. A heat-insulating filler 300 to be described later is disposed in the inner hole 130a, and the upper end can be finished by a cap 135 (see FIG. 1) made of plywood or the like.

The primary barrier 140 is in direct contact with the cryogenic fluid and may be fabricated from a metallic material such as stainless steel (SUS). In addition, the first barrier 140 may have a curved surface portion 140a to correspond to thermal stress.

Referring to FIG. 6, the heat insulating filler 300 is installed in the inner hole 130a of the upper heat insulating board 130 for reducing heat transfer. The heat insulating filler 300 may be manufactured in the form of a closed container filled with a gas having a thermal conductivity higher than that of nitrogen. For example, the gas may include any one of helium, neon, argon, krypton, xenon, radon, HFC-245fa, HCFC-141b, cyclopentane, and carbon dioxide. The heat insulating filler 300 may be formed to correspond to the shape of the inner hole 130a, and may be formed into a cylindrical shape, for example, of a metal material.

Referring to FIG. 7, a metal tape 310 may be attached to the inner surface of the front portion 301 of the heat-insulating filler 300 facing the plug 135. The metal tape may include aluminum tape (silver tape) or the like. As another example, the inner surface of the front portion 301 of the heat insulating filler 300 facing the stopper 135 may be polished.

The heat insulating filler 300 includes a front portion 301 close to the cryogenic fluid side and a rear portion 302 positioned closer to the inner shell wall 2 side than the front portion 301. When the heat insulating filler 300 is inserted into the inner hole 130a of the upper heat insulating board 130, radiative heat transfer occurs mainly inside the sealed heat insulating filler 300. Therefore, a countermeasure against radiative heat transfer inside the heat insulating filler 300 is required. To cope with this, a metal tape is attached to the inner surface of the front portion 301 of the heat insulating filler 300 near the cryogenic fluid, The inner surface can be polished.

Likewise, when the heat insulating filler 300 is installed in the inner hole 110a of the lower heat insulating board 110 of FIG. 3, the heat insulating filler 300 relatively closer to the cryogenic fluid side than the rear portion 302 near the inner wall 2 of the ship, The metal tape 310 may be attached to the inner surface of the front portion 301 of the front portion 301 or the inner surface of the front portion 301 may be polished.

8, as another example, a plug member 320 made of a foam material may be inserted into a space between the stud bolt 211 and the heat-insulating filler 300. The plug member 320 may be made of PU foam to improve the heat insulating performance. Accordingly, heat transfer can be effectively blocked by the combination of the heat-insulating filler 300 and the plug member 320 while reducing the use of the expensive plug member 320. [

9, the hold 500 according to an embodiment of the present invention includes an upper flat portion 511 covering an upper portion of a receiving space S for storing fluids, a lower flat portion 512 covering a lower portion, Side first inclined portions 515 and 516 connecting the upper side flat portion 511 and the side wall portions 513 and 514 and the lower side flat portion 512 and the side wall portions 513 and 514 respectively And may include an octahedral structure including both side second inclined portions 517 and 118 connected to each other. At this time, the barrier structure provided with the heat insulating filler 300 may be installed on at least one of the upper flat portion 511, the side wall portions 513 and 514, and the first inclined portions 515 and 516 of the hold 500. In FIG. 9, the barrier structure of FIG. 1 is shown simplified to facilitate understanding, and is denoted by reference numeral 501.

The plug member is inserted into the inner hole formed in the corner portion of the upper insulating board. However, in the embodiment of the present invention, as described above, the plug member is removed or partially used, ) Were installed. When the plug member is removed from the conventional barrier structure, the amount of heat transfer can be increased by the convection and radiation due to the heat conduction of the nitrogen gas filled in the hole.

The heat transferred by the convection moves from a high temperature to a low temperature. Therefore, for example, when the barrier structure (body) to which the above-described heat insulating filler 300 is applied is provided on the upper flat portion 511 of the holding window 500, the conventional plug member is removed regardless of whether the heat insulating filler 300 is installed Heat transfer due to convection in the inner hole 130a hardly occurs. This is because the temperature in the barrier structure 501 is nearer to the cryogenic fluid and the temperature is relatively higher near the inner wall 2 of the hull. Heat transfer due to convection hardly occurs in the side wall portions 513 and 514 and the first inclined portions 515 and 516 similarly to the upper flat surface portion 511.

Therefore, only heat transfer by radiation in the inner hole 130a can be effectively blocked. In order to achieve this, in the embodiment of the present invention described above, the conventional plug member is removed from the inner hole 130a, and the barrier structure provided with the heat insulating filler 300 is inserted into the upper flat surface portion 511, the side wall portions 513, 514 And first inclined portions 515 and 516, respectively. At this time, the remaining portions 512, 571, and 118 of the hold 500 may be provided with an existing barrier structure in which a plug member is provided in the inner hole 130a.

Hereinafter, a barrier structure provided at a corner portion of the cargo hold will be described.

1 and 2, a barrier structure provided at the corner of a cargo hold includes a corner lower insulation board 10, a curved secondary barrier 12, a corner upper insulation board 20, And a barrier 22.

The corner portion lower insulation board 10 includes a first corner insulation board 10a and a second corner insulation board 10b that are separately manufactured. The first corner portion insulating board 10a is disposed laterally on the corner bottom portion of the cargo hold and the second corner insulating board 10b is disposed longitudinally on the corner portion side of the cargo hold. An inclined surface of the second corner insulating board 10b is closely adhered to one side of the first corner insulating board 10a forming a slope toward the side of the cargo hold to form an interface B. The upper corner portion of the corner portion lower thermal insulation board 10 may be chamfered in an inclined form so that the intersecting portion of the secondary wall corrugation portion is appropriately disposed at the corresponding portion.

The first corner portion heat insulating board 10a and the second corner heat insulating board 10b may be arranged at various angles such as 90 degrees and 135 degrees depending on the shape of the cargo hold corner portion. The corner portion lower heat-insulating board 10 may have the same lamination structure as the lower heat-insulating board 110 provided in the above-described cargo hold flat portion. A lower corner insulating board 10 including a first corner insulating board 10a and a second corner insulating board 10b which are separately formed in a single body and installed in the corner portion of the cargo hold in the horizontal and vertical directions, It is possible to efficiently cope with thermal stress due to the cryogenic fluid and peel stress and shear stress due to the deformation of the hull.

The curved secondary barrier 12 is disposed on the upper portion of the support member 11 and a curved corner 12a is disposed around the interface B. The curved secondary barrier 12 extends from the curved corner portion 12a to both sides of the flat portion 12b and extends between the first corner insulating board 10a and the second corner insulating board 10b The degree of bending of the corner portion 12a according to the coupling angle can be designed and manufactured in advance.

The curved secondary barrier 12 is formed by a fastening member including a rivet or the like so that the end portions of both flat portions 12b are respectively located on the first corner insulating board 10a and the second corner insulating board 10b . As described above, the first corner insulating board 10a and the second corner insulating board 10b can be effectively combined with each other by the curved secondary barrier 12 disposed on the upper side in a state in which the inclined surfaces of the first corner insulating board 10a and the second corner insulating board 10b are in close contact with each other .

The above-described support member 11 has a structure in which the interface B extends from the center of the first corner portion insulating board 10a to the second corner of the insulating board 10b to support the curved secondary barrier 12 disposed at the upper portion, As shown in Fig. The supporting member 11 has a rear corner portion 11a corresponding to a coupling angle between the first corner portion heat insulating board 10a and the second corner heat insulating board 10b and a corner portion 11b corresponding to a corner portion of the curved secondary wall 12 And has a concave upper end portion 11b corresponding to the shape of the upper surface 12a. Since the support member 11 is disposed in close contact with the gap between the corner portion 12a of the curved secondary barrier 12 and the corner lower insulation board 10, It is possible to more stably bond between the heat insulating boards 10 so as to effectively cope with loads acting under various conditions.

The corner portion upper heat insulation board 20 is integrally formed and disposed on the upper part of the secondary barrier so as to correspond to the corner lower insulation board 10. The corner portion upper heat insulating board 20 may have the same lamination structure as the upper heat insulating board 130 installed on the above-described cargo hold flat portion.

The corner portion primary barrier 22 is disposed on the corner upper insulation board 20. The corner portion primary barrier 22 may be connected to the primary barrier 140 installed in the flat portion of the cargo hold.

The above-mentioned heat insulating filler 300 may be applied to the corner barrier structure of the cargo hold. That is, although not shown, it is disposed in an inner hole formed in the upper heat insulating board 20 above the corner portion to effectively block heat transfer.

The foregoing has shown and described specific embodiments. However, it is to be understood that the present invention is not limited to the above-described embodiment, and various changes and modifications may be made without departing from the scope of the technical idea of the present invention described in the following claims It will be possible.

10: Corner Lower Insulation Board 12: Curved Secondary Barrier
20: Upper corner of upper corner insulation board 22: Corner primary wall
110: lower insulation board 111: lower protection board
112: lower insulation member 113: lower sub-panel
120: secondary barrier 130: upper insulation board
131: upper protection plate 132: upper insulation member
133: shock absorbing layer 134: upper auxiliary panel
140: Primary barrier 300: Insulating filler

Claims (7)

An upper insulating board disposed between the primary barrier and the secondary barrier; And
And a lower insulation board disposed between the upper portion of the inner wall of the hull and the secondary barrier,
The lower insulation board is provided with a stud bolt protruding into an inner hole of the upper insulation board to be used for coupling with the upper insulation board,
Wherein the inner hole is provided with a heat-insulating filler filled with a gas for blocking heat transfer therein,
Wherein the heat insulating filler includes a front portion close to the cryogenic fluid stored in the cargo hold and a rear portion closer to the inner wall of the hull than the front portion,
Wherein a metal tape is attached to an inner surface of the front surface portion or an inner surface of the front surface portion is polished. The method according to claim 1,
Said gas having a thermal conductivity greater than nitrogen. 3. The method of claim 2,
Wherein the gas comprises any one of helium, neon, argon, krypton, xenon, radon, HFC-245fa, HCFC-141b, cyclopentane and carbon dioxide. The method according to claim 1,
The heat-insulating filler is constructed in the form of a closed container made of a metal material. delete The method according to claim 1,
And a plug member made of a foam material is inserted into the space between the stud bolt and the heat insulating filler. The method according to claim 1,
Wherein the lower insulation board forms an inner hole coupled to a stud bolt fixed to an inner wall of the hull, and the heat insulating filler is further provided in an inner hole of the lower insulation board.

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