CN108541247B - Structure for connecting alternately stacked vacuum insulation panels of freestanding liquefied gas storage tank - Google Patents

Structure for connecting alternately stacked vacuum insulation panels of freestanding liquefied gas storage tank Download PDF

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Publication number
CN108541247B
CN108541247B CN201680073331.5A CN201680073331A CN108541247B CN 108541247 B CN108541247 B CN 108541247B CN 201680073331 A CN201680073331 A CN 201680073331A CN 108541247 B CN108541247 B CN 108541247B
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China
Prior art keywords
vacuum insulation
insulation panels
liquefied gas
freestanding
alternately stacked
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CN201680073331.5A
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Chinese (zh)
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CN108541247A (en
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尹钟铉
白范圭
南大祐
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Qingdong One
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Qingdong One
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B25/00—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby
    • B63B25/02—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods
    • B63B25/08—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid
    • B63B25/12—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid closed
    • B63B25/16—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid closed heat-insulated
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C3/00—Vessels not under pressure
    • F17C3/02—Vessels not under pressure with provision for thermal insulation
    • F17C3/025—Bulk storage in barges or on ships
    • F17C3/027—Wallpanels for so-called membrane tanks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B25/00—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby
    • B63B25/02—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods
    • B63B25/08—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid
    • B63B2025/087—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid comprising self-contained tanks installed in the ship structure as separate units
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2201/00—Vessel construction, in particular geometry, arrangement or size
    • F17C2201/01—Shape
    • F17C2201/0147—Shape complex
    • F17C2201/0157—Polygonal
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2201/00—Vessel construction, in particular geometry, arrangement or size
    • F17C2201/05—Size
    • F17C2201/052—Size large (>1000 m3)
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2201/00—Vessel construction, in particular geometry, arrangement or size
    • F17C2201/05—Size
    • F17C2201/054—Size medium (>1 m3)
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/03—Thermal insulations
    • F17C2203/0304—Thermal insulations by solid means
    • F17C2203/0358—Thermal insulations by solid means in form of panels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/03—Thermal insulations
    • F17C2203/0391—Thermal insulations by vacuum
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/03—Mixtures
    • F17C2221/032—Hydrocarbons
    • F17C2221/033—Methane, e.g. natural gas, CNG, LNG, GNL, GNC, PLNG
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/03—Mixtures
    • F17C2221/032—Hydrocarbons
    • F17C2221/035—Propane butane, e.g. LPG, GPL
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/01—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
    • F17C2223/0146—Two-phase
    • F17C2223/0153—Liquefied gas, e.g. LPG, GPL
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/01—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
    • F17C2223/0146—Two-phase
    • F17C2223/0153—Liquefied gas, e.g. LPG, GPL
    • F17C2223/0161—Liquefied gas, e.g. LPG, GPL cryogenic, e.g. LNG, GNL, PLNG
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/03—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the pressure level
    • F17C2223/033—Small pressure, e.g. for liquefied gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2260/00—Purposes of gas storage and gas handling
    • F17C2260/03—Dealing with losses
    • F17C2260/031—Dealing with losses due to heat transfer
    • F17C2260/033—Dealing with losses due to heat transfer by enhancing insulation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2270/00—Applications
    • F17C2270/01—Applications for fluid transport or storage
    • F17C2270/0102—Applications for fluid transport or storage on or in the water
    • F17C2270/0105—Ships
    • F17C2270/0107—Wall panels

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Ocean & Marine Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Thermal Insulation (AREA)

Abstract

The present invention relates to a structure for connecting vacuum insulation panels of a freestanding liquefied gas storage tank, which structure is arranged to store liquefied gas such as LNG or LPG. The present invention relates to a structure for connecting alternately stacked vacuum insulation panels of a freestanding liquefied gas storage tank, the vacuum insulation panels having a core material and an outer cover surrounding the core material and the interior of the outer cover being formed into a vacuum, wherein the vacuum insulation panels are continuously and alternately stacked and disposed to prevent heat loss outside a tank body of the liquefied gas storage tank, thereby performing insulation. There is provided a structure for connecting alternately stacked vacuum insulation panels of a freestanding liquefied gas storage tank, the structure comprising: a stud bolt provided outside the tank body; a vacuum insulation panel attached to an outside of the tank body by stud bolts; a gasket fitted to the stud bolt so as to form a gap between the vacuum insulation panel and the can body; and a fixing member for fixing the gasket, wherein the vacuum insulation panel may be fixed by connecting another fixing member to the fixing member.

Description

Structure for connecting alternately stacked vacuum insulation panels of freestanding liquefied gas storage tank
Technical Field
The present invention relates to a structure for coupling vacuum insulation panels of a freestanding liquefied gas storage tank configured to store liquefied gas such as LNG or LPG.
Background
Natural Gas is transported in a gaseous state through Natural Gas pipelines on land or on sea, or is transported to a remote consumer side in the form of Liquefied Natural Gas (LNG) or Liquefied Petroleum Gas (LPG) stored in a carrier. The LNG liquefies natural gas containing methane as a main component at minus 162 ℃ under atmospheric pressure, has a liquid-gas volume ratio of about 1/600, and has a liquefied specific gravity of 0.43 to 0.50.
An LNG carrier that is sailing offshore and unloads LNG to a demand side on land or an LNG Regasification Vessel (RV: Regasification Vessel) that is loading LNG sailing offshore and regasifying stored LNG to be unloaded in the state of natural gas after arriving at the demand side on land includes a storage tank (often referred to as a "cargo hold") capable of withstanding cryogenic liquefied natural gas.
Such storage tanks can be classified into a free-standing type and a thin film type according to whether or not a load of cargo directly acts on an insulation material. Generally, thin film type tanks are classified into 96 th type and Mark III type, and freestanding tanks are classified into MOSS type and SPB type. The structure of the MOSS type freestanding tank is described in korean patent No. 10-15063, etc., and the structure of the SPB type freestanding tank is described in korean patent No. 10-30513, etc.
In general, a freestanding storage tank is manufactured by attaching a relatively hard heat insulating plate such as polyurethane foam to a tank body made of a low temperature resistant alloy such as aluminum alloy, SUS, and 9% nickel, and is located on a plurality of tank supports arranged at an inner bottom of a hull.
An insulation structure of a liquefied gas storage tank in which a plurality of insulation panels made of polyurethane foam are installed outside the tank body is described in korean patent No. 10-166608 and the like.
The insulation structure of the liquefied gas storage tank according to the related art is limited in that the size of one insulation panel cannot be increased more than a certain level when the insulation panel is installed because the insulation panel must have a predetermined thickness. In order to solve this problem, korean patent laid-open publication nos. 10-2011-: a stud bolt; a first heat shield fitted to the stud bolts; a fixing member coupled to the stud bolt to fixedly hold the first heat insulation plate; and a second heat insulation plate bonded to the fixing member and stacked on the first heat insulation plate.
However, when the heat insulation board is extended by a mounting member such as a fixing member, since the boundary of the heat insulation board is stacked in a straight line, the length of the heat from the atmosphere reaching the surface of the tank is short, and thus the heat insulation performance is degraded. Further, although the stud bolts, the fixing members are filled with filling members such as heat insulating materials, etc., heat can permeate from the atmosphere to the surface of the tank through the gaps, whereby complete heat insulation is not achieved.
Disclosure of Invention
Technical problem
The present invention is directed to solving the above-mentioned problems, and an object of the present invention is to provide a structure for connecting alternately stacked vacuum insulation panels of a freestanding liquefied gas storage tank, which is capable of alternately stacking the vacuum insulation panels on a tank body, thereby extending the length of heat from the atmosphere reaching the surface of the tank along the boundary of the vacuum insulation panels to improve the insulation performance, and improving the insulation performance while thinning the thickness of the insulation panels.
Technical scheme
The structure for connecting alternately stacked vacuum insulation panels of a freestanding liquefied gas storage tank of the present invention for achieving the object comprises: a vacuum insulation panel having a core material and an outer cover surrounding the core material, and an inside of the outer cover being formed in a vacuum; and as a structure for connecting alternately stacked vacuum insulation panels of freestanding liquefied gas storage tanks for continuously and alternately stacking vacuum insulation panels to prevent heat loss outside a tank body of a liquefied gas storage tank and thereby performing insulation, the structure for connecting alternately stacked vacuum insulation panels of the freestanding liquefied gas storage tanks is provided, the structure comprising: a stud bolt mounted on the exterior of the tank; the vacuum insulation panel is connected to the outside of the tank body through the stud bolts; a gasket fitted to the stud bolt so as to form a gap between the vacuum insulation panel layer and the can body; and a fixing member for fixing the gasket, and the vacuum insulation panel may be fixed by connecting another fixing member to the fixing member.
Advantageous effects
According to the present invention as described above, vacuum insulation panels continuously connected to the outside of a can body may be alternately stacked, thereby extending the length of heat from the atmosphere reaching the surface of the can along the boundary of the vacuum insulation panels to improve insulation performance. Further, heat loss may be prevented from occurring by the mounting member such as the stud bolt and the fixing member and the filling member or may be prevented from occurring by a gap between the mounting member and the filling member. Further, it is possible to improve insulation performance compared to the conventional polyurethane foam insulation panel, thereby minimizing transportation costs for liquefied gas carrying capacity, reducing the thickness of the insulation panel to increase the storage space of the storage tank, and furthermore, reducing the weight of the storage tank to reduce transportation costs.
Drawings
Fig. 1 is a view illustrating a structural member for connecting vacuum insulation panels according to the present invention.
Fig. 2 is a flowchart illustrating a process of attaching vacuum insulation panels according to the present invention.
Fig. 3 is a view illustrating the effect of consecutive and alternately stacked vacuum insulation panels according to the present invention.
Fig. 4 is a view illustrating the construction of a vacuum insulation panel including a protective layer according to the present invention.
Fig. 5 is a view illustrating a method of installing a finishing material in a structural member for attaching a vacuum insulation panel according to the present invention.
Detailed Description
Hereinafter, a structure for coupling alternately stacked vacuum insulation panels of a freestanding liquefied gas tank according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.
Fig. 1 is a sectional view for explaining a structural member for attaching a vacuum insulation panel according to a preferred embodiment of the present invention, and fig. 2 sequentially illustrates a process of attaching a mounting member and a vacuum insulation panel to the outside of a tank.
As shown in fig. 1 and 2, the insulation structure of the free-standing liquefied gas tank is formed by stacking vacuum insulation panels 6 on the outside of the tank body 1 to form a vacuum insulation panel layer. The vacuum insulation panel 6 is formed as an insulation material having very low thermal conductivity so that an outer cover having high shielding performance including an aluminum thin film can surround all surfaces of the organic or inorganic base hole type core material. A plurality of vacuum insulation panels 6 are arranged adjacent to and continuously from each other outside the tank body 1 of the storage tank to form a lower vacuum insulation panel layer 6b, and one or more layers of vacuum insulation panels are alternately stacked on the lower vacuum insulation panel layer 6b to form an upper vacuum insulation panel layer 6 a.
The lower vacuum insulation panel layer 6b is not closely adhered to the can body 1 and a gap 9 is formed by the gasket 2. The gap 9 between the can body 1 and the lower vacuum insulation panel layer 6b may be used as a ventilation space and also as a passage for leaking liquid when leakage occurs due to damage of the can body 1.
According to the structural member for connecting vacuum insulation panels according to the preferred embodiment of the present invention, the stud bolts 51 are installed at the outside of the can body 1 at regular intervals. The stud bolt 51 may be fixedly installed at the outside of the can body 1 by welding.
A gasket 2 having a predetermined thickness is fitted on the stud bolt 51. The gasket 2 has a stepped portion whose center portion has a height lower than that of its periphery, and the gasket 2 has a through-groove (through-groove) formed at the center thereof. Accordingly, the stud bolt 51 passes through the through groove formed in the stepped portion of the gasket 2, and the first fixing member 3 accommodating the end portion of the stud bolt 51 is screwed into the through groove. A lower end portion 52 of one side of the first fixing member 3 is screw-coupled with the stud bolt 51 to be fixed, so that a pressing protrusion 53 formed on a side surface of the first fixing member 3 presses the gasket 2 to closely adhere the gasket 2 to the can body 1. At the central portion of the pad 2, a stepped portion formed by a downward stepped unused space (empty space)8 is formed. Therefore, even if the first fixing member 3 is assembled after inserting the stud bolt 51 into the stepped portion, the pressing protrusion 53 of the first fixing member 3, which presses the vacuum insulation panel 6, is not prevented from being placed in the vacant space 8 of the stepped portion, and the vacuum insulation panel 6 is closely adhered and mounted to the lower vacuum insulation panel layer 6 b.
To accommodate the lower end 71 of the second fixing member 4, an extended thread is formed on the upper end 54 opposite to the lower end 52 where the stud bolt 51 is engaged in the first fixing member 3.
The edge of the vacuum insulation panel 6 forming the lower vacuum insulation panel layer 6b is positioned and fixed on the mat 2. That is, respective edges of the vacuum insulation panels 6 forming the lower vacuum insulation panel layer 6b are respectively positioned and fixed on different mats 2. That is, the pad 2 receives an apex (apex portion) where the edges of the vacuum insulation panel 6 meet, and an apex portion where the other edge of the vacuum insulation panel 6 meets is received by the other pad 2. The vacuum insulation panels 6 are continuously installed on the mat 2 arranged at a prescribed interval to surround the can body 1, and the size of the gap 9 between the can body 1 and the vacuum insulation panels 6 can be maintained constant by means of the mat 2.
The vacuum insulation panel 6 of the lower vacuum insulation panel layer 6b, each edge of which is fixed and mounted on the mat 2, is fixed by screwing the second fixing member 4 into the first fixing member 3 fixing the mat 2. The second fixing member 4 is composed of a plate-shaped pressing plate 72 and a lower end portion 71 installed at a lower portion of the pressing plate 72 such that the pressing plate 72 presses and fixes edges of the respective vacuum insulation panels 6 when the lower end portion 71 of the second fixing member 4 is coupled to the first fixing member 3. Accordingly, in the vacuum insulation panel 6, the mounting members including the stud bolts 51 and the first and second fixing members 3 and 4 are received at the apex portion where the edges of the vacuum insulation panel 6 meet.
Meanwhile, the insulation pad 5 formed of a foam or inorganic fiber matrix having elasticity is filled in the vacant space 8 of the stepped portion at the center of the pad 2 and between the adjacent vacuum insulation panels 6 among the vacuum insulation panels 6. The insulation pad 5 between the vacuum insulation panels 6 may be previously attached and mounted to the side surfaces of the vacuum insulation panels 6, or may be assembled and mounted after the vacuum insulation panels 6 are mounted. The width of the gasket may be varied according to the contraction or expansion of the tank body 1 when the liquefied gas is supplied or discharged.
When a plurality of upper vacuum insulation panel layers 6a are stacked on the lower vacuum insulation panel layers 6b, the vacuum insulation panels 6 are configured to be alternately stacked. As shown in fig. 3(a), when the stacking direction boundaries between the adjacent vacuum insulation panels 6 are stacked in a straight line, the length of heat from the atmosphere reaching the surface of the can is short, thereby degrading the insulation performance. In contrast, as in the preferred embodiment of the present invention shown in fig. 3(b), when the vacuum insulation panels 6 are continuously and alternately stacked, the stacking direction boundary becomes zigzag, so that the length of heat from the atmosphere reaching the surface of the can is long, thereby improving the insulation performance. This is based on the following Fourier's law.
The fourier law is shown in the following equation 1.
Equation 1
Q＝-kA(t2-t1)/L
(in this context, Q: heat transfer amount, A: cross-sectional area, k: thermal conductivity, t2-t 1: temperature gradient, L: distance)
According to the fourier law, the heat transfer quantity is proportional to the cross-sectional area and inversely proportional to the distance with respect to the temperature gradient. That is, it can be seen that when the stacking direction boundaries of the vacuum insulation panels 6 are alternately stacked in a zigzag manner instead of being stacked in a straight line, the length of the heat from the atmosphere reaching the surface of the can is long, and thus the heat can be minimized and the insulation performance can be improved.
As shown in fig. 4, when one or more vacuum insulation panels 6 are continuously stacked, at least one vacuum insulation panel 6 may include a protective layer 81 on the vacuum insulation panel. The protective layer 81 protects the vacuum insulation panel from the internal vacuum due to the external environment or pressure and mechanical impact.
Fig. 4 illustrates a case where a vacuum insulation panel including a protective layer 81 is stacked on the uppermost layer. The protective layer 81 may be stacked on the outside of the vacuum insulation panel, and may be coated on the outer surface of the vacuum insulation panel. The protective layer 81 may be formed of an organic material sheet such as polypropylene, polyethylene, polystyrene, polyvinyl alcohol, polycarbonate, polymethyl methacrylate, and polyethylene terephthalate, or may be formed of an inorganic material sheet such as foamed foam, non-woven fabric, and glass fiber.
The uppermost layer of the stacked vacuum insulation panels 6 is mounted with a finishing material 7. The decorative material may use a sheet of a metal material such as aluminum-plated zinc, aluminum, zinc, and stainless steel, or a sheet of a composite material of phenolic resin, epoxy resin, polyester resin, and thermosetting resin reinforced with fibers such as carbon fiber, glass fiber, and rock wool, or a sheet of rubber, or a sheet of a wood plate material, or the like.
A method of installing trim material is illustrated in fig. 5. As shown in fig. 5(a), when the finishing material 7 is installed by being closely adhered to and vertically bolted to the vacuum insulation panel 6, the vacuum formed inside the vacuum insulation panel 6 may be broken. Therefore, as shown in fig. 5(b), it is preferable to bend the finishing material 7 by 90 degrees for horizontal bolting and fitting, or as shown in fig. 5(c), it is preferable to apply an adhesive between the finishing material 7 and the vacuum insulation panel 6 to guide fixing with the adhesive layer 100, or alternatively, as described above and as shown in fig. 5(d), fixing with a tape.
In the structural member for connecting alternately stacked vacuum insulation panels of a freestanding liquefied gas storage tank according to the present invention, a composite member constituting the vacuum insulation panel 6 and mounting members such as an insulation pad 5 and a finishing material 7 may be assembled on the tank body 1, or the vacuum insulation panel 6 and a vacuum insulation panel layer provided with the mounting members may be modularized and assembled so as to be mounted on the tank.
The structure for connecting alternately stacked vacuum insulation panels of freestanding liquefied gas storage tanks according to the present invention can be applied not only to freestanding liquefied gas tanks on land but also to any offshore structure having freestanding liquefied gas tanks mounted thereon floating on the sea with ocean currents; and can be applied to offshore plants such as LNG Floating Production Storage and Offloading (FPSO) or LNG Floating Storage and Regasification Unit (FSRU), liquefied gas carriers such as LNG or LPG or LNG Regasification Vessels (RV), and the like.
As described above, although the structural member for connecting alternately stacked vacuum insulation panels of a freestanding liquefied gas storage tank according to the present invention has been described with reference to the accompanying drawings, it is apparent to those skilled in the art to which the present invention pertains that the present invention is not limited to the above-described embodiments and drawings, and various changes and modifications may be made within the scope of the appended claims.
Detailed description of the major elements
1: the tank body 2: liner pad
3: first fixing member 4: second fixing member
5: heat insulating spacer 6: vacuum heat insulation plate
7: and (3) decorative material 8: unused space
9: gap 51: stud bolt
52: lower end portion 53 of first fixing member: pressing projection of first fixing member
54: upper end portion 71 of first fixing member: lower end of the second fixing member
72: pressing plate 81: protective layer
100: adhesive layer

Claims (7)

1. A structural member for coupling alternately stacked vacuum insulation panels of a freestanding liquefied gas storage tank, in which stud bolts are installed on a surface of a tank body at predetermined intervals and insulation panels are stacked so as to surround the outside of the tank body by means of the stud bolts, thereby insulating the tank body from the atmosphere, the structural member comprising:
the insulation panel, it is set up as the said vacuum insulation panel used for surrounding the core material and having outer cover, the inside of the said outer cover forms into the vacuum;
a washer fitted to the stud bolt;
a first fixing member fastened to the stud bolt and having a pressing protrusion that presses and fixes the gasket in a fastened state;
a lower vacuum insulation panel layer installed such that edges of the adjacent vacuum insulation panels are seated on the pad;
a second fixing member coupled to the first fixing member, the second fixing member having a pressing plate which presses and fixes edges of the plurality of vacuum insulation panels in a coupled state; and
an upper vacuum insulation panel layer formed on an upper side of the lower vacuum insulation panel layer such that the vacuum insulation panels are alternately stacked with respect to the lower vacuum insulation panel in such a manner that a stacked boundary becomes a zigzag shape when the vacuum insulation panels are sequentially and alternately stacked one or more layers.
2. The structure for joining alternately stacked vacuum insulation panels of a freestanding liquefied gas storage tank as claimed in claim 1, comprising: a protective layer stacked on at least one of the vacuum insulation panels.
3. The structure for connecting alternately stacked vacuum insulation panels for a freestanding liquefied gas storage tank as claimed in claim 2, wherein the protective layer comprises an organic material sheet selected from the group consisting of polypropylene, polyethylene, polystyrene, polyvinyl alcohol, polycarbonate, polymethyl methacrylate and polyethylene terephthalate, or comprises an inorganic material sheet selected from the group consisting of foamed foam, non-woven fabric and glass fiber.
4. The structure for connecting alternately stacked vacuum insulation panels of a freestanding liquefied gas storage tank as claimed in claim 1, wherein the vacuum insulation panels further comprise an insulation pad made of a foam pad having elasticity or an insulation pad made of an inorganic material fiber-based pad in a vacant space of a step portion formed on side and central portions of the pad.
5. The structure for coupling alternately stacked vacuum insulation panels for a freestanding liquefied gas storage tank as claimed in claim 1, wherein a finishing material is installed on an upper portion of the vacuum insulation panels stacked on the uppermost layer among the vacuum insulation panels, the finishing material comprising one or more selected from among a metal material sheet plated with aluminum zinc, aluminum, zinc and stainless steel, or a composite material sheet of thermosetting resin selected from phenol resin, epoxy resin and polyester resin, or a rubber sheet, or a wooden plate material.
6. The structure for connecting alternately stacked vacuum insulation panels of a freestanding liquefied gas storage tank as claimed in claim 5, wherein the assembly of the finishing material is completed by bending the finishing material by 90 degrees to horizontally bolt the finishing material, or the assembly of the finishing material is completed by an adhesive, or the assembly of the finishing material is completed by bending the finishing material by 90 degrees to horizontally bolt the finishing material, and then fixing with a tape.
7. The structure for connecting alternately stacked vacuum insulation panels of a freestanding liquefied gas storage tank as claimed in claim 1, wherein the upper and lower vacuum insulation panel layers are formed by mounting the vacuum insulation panels, on which an insulation pad made of a foam pad or an insulation pad made of a fiber-based pad and a finishing material are integrally attached to the vacuum insulation panels and are modularized, on the tank.
CN201680073331.5A 2015-12-15 2016-11-21 Structure for connecting alternately stacked vacuum insulation panels of freestanding liquefied gas storage tank Active CN108541247B (en)

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KR1020150178800A KR101772581B1 (en) 2015-12-15 2015-12-15 Cross stacked insulation panel installation structure of independent type liquefied gas storage tank
KR10-2015-0178800 2015-12-15
PCT/KR2016/013425 WO2017104988A1 (en) 2015-12-15 2016-11-21 Structure for connecting alternately stacked vacuum insulation panels of independent type liquefied gas storage tank

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KR101772581B1 (en) 2017-08-31
JP2019506338A (en) 2019-03-07
JP6781526B2 (en) 2020-11-04
EP3392131A4 (en) 2019-09-25
EP3392131B1 (en) 2022-06-01
WO2017104988A1 (en) 2017-06-22
CN108541247A (en) 2018-09-14
EP3392131A1 (en) 2018-10-24

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