KR20100090036A - Heat insulation structure and cryogenic liquid storage tank having the same - Google Patents

Abstract

PURPOSE: An insulation structure and a cryogenic liquid storage tank having the same are provided to obtain excellent resistance to the pressure of a cryogenic liquid by being inserted into a receiving groove which is formed on an insulating panel. CONSTITUTION: An insulation structure(11) of a cryogenic liquid storage tank is combined with the inner side of a tank wall(10) of the cryogenic liquid storage tank. The insulation structure insulates a storage space in which a cryogenic liquid is stored. The insulation structure comprises: an insulating panel(12) which is combined with the tank wall to prevent thermal transfer between the tank wall and the storage space and includes a plurality of receiving grooves(23); and a main barrier(13) having a plurality of wrinkles parts(26) which are inserted into the multiple receiving grooves.

Description

Heat-insulating structure and cryogenic liquid storage tank having the same {HEAT INSULATION STRUCTURE AND CRYOGENIC LIQUID STORAGE TANK HAVING THE SAME}

The present invention relates to a cryogenic liquid storage tank, and more particularly to an insulating structure for insulating the storage space in which the cryogenic liquid is stored, and a cryogenic liquid storage tank having the same.

Cryogenic liquids, such as LNG, Liquid Argon (LAR), Liquid Nitrogen (LIN), Liquid Oxygen (LOX), and Liquid Hydrogen (LH2), are stored in insulated storage tanks to minimize liquid loss by evaporation. Stored or transported in stored condition.

As an example of such a cryogenic liquid storage tank, the storage tank for liquefied natural gas is for storing the cryogenic liquefied natural gas of about -165 ℃, there are spherical type (Spherical Type) and membrane type (Membrane Type). Membrane type liquefied natural gas storage tank is the most widely used because of its larger loading capacity and simpler manufacturing than the spherical type liquefied natural gas storage tank. Membrane-type liquefied natural gas storage tanks include the Mark-III type and the NO-96 type developed by Gaz Transport et Technigaz (GTT), France. These liquefied natural gas storage tanks have a heat insulating structure for preventing the leakage of liquefied natural gas and insulating the storage space in which the liquefied natural gas is stored. Among the Mark-III and NO-96 types, the Mark-III liquefied natural gas storage tank is preferred to the NO-96 type because of its easy construction and low material cost.

The insulation structure of the Mark-III type liquefied natural gas storage tank includes a main barrier whose surface is directly in contact with the cryogenic liquefied natural gas, and an insulating panel coupled to the rear surface of the main barrier. The insulation panel has a sandwich structure including an inner panel coupled to the main barrier and an outer panel fixed to the tank wall. The inner panel and the outer panel are each composed of a plywood protecting plate and a heat insulating material such as urethane foam.

The insulation panel is fixed to the tank wall by means of stud bolts welded to the tank wall. Insert the stud bolt to the connection part of the insulation panel, and then screw the stud bolt to fix the insulation panel to the tank wall. After the insulation panel is fixed to the tank wall, the joint portion where the insulation panel and the stud bolt are coupled is filled with a connector made of insulation material.

The main barrier contacting the cryogenic liquefied natural gas is made by welding a metal sheet such as stainless steel. Such a main barrier may be damaged due to thermal stress in the welded portion when heat shrinkage occurs. Because of this problem, the main barrier has lattice folds in order to have low in-plane stiffness. The crease reduces deformation by a certain amount when heat shrinkage occurs, thereby reducing the thermal stress at the weld.

However, liquefied natural gas storage tanks installed in a vehicle or a vehicle may cause a wave at the surface of the liquefied natural gas stored therein due to a movement such as rolling or pitching of the vehicle. This wave is called sloshing, which applies a large compressive force to the main barrier. When the compressive force due to slushing exceeds the yield strength of the main barrier, the safety of the main barrier may be deteriorated while the permanent deformation occurs in the wrinkles protruding into the storage space.

The present invention has been made to solve the above problems, and an object thereof is to provide a heat-insulating structure and a cryogenic liquid storage tank having the same, which can greatly improve the reliability by preventing deformation of the main barrier caused by sloshing.

Insulating structure of the cryogenic liquid storage tank according to an embodiment of the present invention for achieving the above object, the insulating panel is coupled to the tank wall to prevent thermal movement between the tank wall and the storage space in which the cryogenic liquid is stored; And a main barrier covering the insulating panel to directly contact the cryogenic liquid stored in the storage space. The insulation panel has a plurality of accommodation grooves, and the main barrier has a plurality of corrugations that protrude toward the tank wall and are inserted into the plurality of accommodation grooves.

Here, the heat insulation panel, a plurality of outer panel having an outer protective plate coupled to the tank wall and the outer insulating material coupled to the outer protective plate, the inner protective plate to be combined with the main barrier and the inner heat insulating material coupled to the inner protective plate. It includes a plurality of inner panel having a plurality of receiving grooves are formed between the plurality of inner panel, Filling the gap formed between the plurality of inner panel between the corrugated portion and the inner panel. Heat-resistant member for may be disposed.

The inner protective plate may include a bent portion inserted into the receiving groove so as to support the wrinkle portion.

In addition, the inner protective plate may be made of a fiber reinforced composite material.

In addition, the heat-resistant member may be made of a material selected from glass fiber, glass fiber-phenolic composite material, phenol foam, plywood, phenol impregnated plywood.

In addition, the insulating structure of the cryogenic liquid storage tank according to an embodiment of the present invention may further include a reinforcing member inserted into the receiving groove to support the pleated portion disposed between the pleated portion and the inner panel. .

In addition, the receiving groove and the cross section of the corrugation portion may be made of a shape selected from semi-circular, semi-elliptic, polygonal.

In addition, the curved portion of the main barrier may have a curved surface to prevent stress concentration.

In addition, a plurality of channels may be formed in the insulation panel such that a passage through which fluid flows may be formed between the insulation panel and the main barrier.

Cryogenic storage tank according to an embodiment of the present invention for achieving the above object, the tank wall is formed therein the storage space for storing the cryogenic liquid, and in order to prevent heat movement between the tank wall and the storage space. Insulating panel coupled to the tank wall and a main barrier covering the insulating panel to be in direct contact with the cryogenic liquid stored in the storage space. The insulation panel has a plurality of accommodation grooves, and the main barrier has a plurality of corrugations that protrude toward the tank wall and are inserted into the plurality of accommodation grooves.

Insulating structure according to the present invention, the wrinkles for absorbing the contraction and expansion by the heat of the main barrier directly in contact with the cryogenic liquid is inserted into the receiving groove formed in the insulation panel without protruding into the storage space, thereby withstanding the pressure of the cryogenic liquid well Can be. Therefore, the risk of breakage of the pleats can be greatly reduced, and the reliability of the cryogenic liquid storage tank can be improved.

Hereinafter, an insulating structure and a cryogenic liquid storage tank having the same according to an embodiment of the present invention will be described with reference to the accompanying drawings. In the drawings, the size and shape of the components, etc. may be exaggerated or simplified to aid in understanding the invention.

As shown in Figure 1 and 2, the cryogenic liquid storage tank according to an embodiment of the present invention is a tank wall 10 and the tank wall 10 in which a storage space for storing the liquefied natural gas is formed therein Is coupled to the inner surface of the insulating structure 11 to insulate the storage space. The thermal insulation structure 11 is coupled to the thermal insulation panel 12 and the thermal insulation panel 12 coupled to the tank wall 10 to prevent thermal movement between the storage space and the tank wall 10 to cover the thermal insulation panel 12. A main barrier 13.

The insulation panel 12 includes a plurality of outer panels 14 coupled to the inner surface of the tank wall 10, a plurality of inner panels 15 coupled to the main barrier 13, an outer panel 14, and an inner panel 15. ), And a secondary barrier 16 interposed therebetween. The outer panel 14 is composed of an outer protection plate 17 and an outer heat insulating material 18 coupled to the tank wall 10, and the inner panel 15 is an inner protection plate 19 and an inner part that is coupled to the main barrier 13. It consists of the heat insulating material 20. Here, the outer protective plate 17 and the inner protective plate 19 is made of a material having a high compressive strength, such as plywood, the outer heat insulating material 18 and the inner heat insulating material 20 is made of a heat insulating material such as polyurethane foam.

The secondary barrier 16 is to prevent the cryogenic liquid leaking from the primary barrier 13 to flow into the tank wall 10. The triple barrier 16 is formed of a glass fiber composite material bonded to both sides of stainless steel or aluminum foil. It is made of various materials to prevent the flow of cryogenic liquids such as Triplex).

The outer panel 14 may be fixed to the tank wall 10 by stud bolts or adhesives coupled to the tank wall 10. A support pad 21 is disposed between the outer panel 14 and the tank wall 10 to adjust a step between the plurality of outer panels 14. The secondary barrier 16 may be coupled to the outer panel 14 and the inner panel 15 by various methods such as adhesion by adhesive, and the main barrier 13 may be attached to the inner panel by various methods such as adhesion or welding by adhesive. It may be coupled to the inner protective plate 19 of (15).

The receiving groove 23 is formed between the plurality of inner panels 15. The receiving groove 23 has a cross-sectional shape of a semicircle or semi-ellipse. The four corners of the rectangular inner panel 15 are provided with curved surfaces 24, so that the concave receiving groove 23 is formed by the two curved surfaces 24 between two adjacent inner panels 15. Is formed.

In the present invention, the heat insulating panel 12 coupled to the tank wall 10 to prevent heat transfer between the tank wall 10 and the storage space is not limited to the structure as described above, and various heat insulating materials having a small heat transfer coefficient may be used. It can be changed to other structures including.

The main barrier 13 is a portion which is in direct contact with the cryogenic liquid and is formed by overlap welding welding a metal sheet such as stainless steel. The main barrier 13 has a plurality of corrugations 26 to reduce in-plane stiffness during thermal contraction and expansion. As shown in FIG. 2, the pleats 26 have a shape corresponding to the receiving groove 23, and are inserted into the receiving groove 23 when the main barrier 13 is coupled to the insulating panel 12. .

The heat resistant member 28 is disposed between the corrugation portion 26 and the inner panel 15 to fill the gap 27 formed between two adjacent inner panels 15. The heat resistant member 28 prevents the heat insulation panel 12 from being damaged by high heat during overlapping welding of the pleats 26, and the pressure received by the pleats 26 is not concentrated in one place, but around the receiving groove 23. Disperse evenly. The heat resistant member 28 is made of various materials having low heat transfer coefficients such as glass fiber, glass fiber-phenolic composite material, phenol foam, plywood, and phenol-impregnated plywood.

Figure 3 shows a portion of a cryogenic liquid storage tank having a heat insulating structure according to another embodiment of the present invention. Most of the heat insulating structure 30 shown in FIG. 3 has the same structure as the heat insulating structure 11 shown in FIG. 2, and the same reference numerals are used for the same parts, and detailed description thereof will be omitted.

Insulating structure 30 according to another embodiment of the present invention is provided with a bent portion 32 bent toward the receiving groove 23 at the corner of the inner protective plate 31. The bent part 32 serves to support the wrinkle part 26 inserted into the receiving groove 23. Here, the inner protective plate 19 may be made of a fiber-reinforced composite material so that the bent portion 32 corresponding to the curved portion 24 (see FIG. 1) can be easily formed. The heat resistant member 28 is disposed between the corrugation part 26 and the heat insulating panel 12 to fill the gap 27 formed between two adjacent inner panel 15.

Figure 4 shows a portion of a cryogenic liquid storage tank having a heat insulating structure according to another embodiment of the present invention. Most of the heat insulating structure 34 shown in FIG. 4 has the same structure as the heat insulating structure 11 shown in FIG. 2, and the wrinkles 26 are interposed between the wrinkles 26 and the inner panel 15. A reinforcing member 35 for supporting is disposed. The reinforcing member 35 has a shape corresponding to the shape of the receiving groove 23 and is inserted into the receiving groove 23. The heat resistant member 28 is disposed between the corrugated portion 26 and the reinforcing member 35 to fill the gap 27 formed between two adjacent inner panels 15. The heat resistant member 28 may be disposed between the heat insulation panel 12 and the reinforcement member 35.

Figure 5 shows a heat insulation panel of the heat insulation structure according to another embodiment of the present invention. Most of the heat insulation panel 37 of the heat insulation structure shown in FIG. 5 has the same structure as the heat insulation panel 12 of the heat insulation structure 11 shown in FIG. 1, and has a plurality of channels 38. The plurality of channels 38 are formed on one surface of the inner protection plate 19, and fluid flows between the insulation panel 12 and the main barrier 13 when the main barrier 13 is coupled to the inner protection plate 19. It will form a passage that can be. An inspection fluid for the leakage inspection of the welded portion of the main barrier 13 can flow through the passage made by the plurality of channels 38.

Although the plurality of channels 38 are formed in parallel with the edges of the inner protection plate 19 at regular intervals, the plurality of channels 38 may be formed in various forms to secure fluidity such as lattice or radial shape. Can be done.

6 to 8 show various modifications of the pleats provided on the main barrier of the thermal insulation structure according to the present invention and the receiving groove for receiving them.

6 is a cross-sectional shape of the pleated portion 41 and the receiving groove 42 is a rectangular shape, the shape corresponding to the shape of the receiving groove 42 between the pleated portion 41 and the inner panel 15. The heat resistant member 43 is disposed. The pleated portion 44 and the receiving groove 45 shown in FIG. 7 is formed in a triangular cross-sectional shape, and the pleated portion 47 and the receiving groove 48 shown in FIG. 8 have a pentagonal cross-sectional shape. will be. Between each of the corrugations 44 and the inner panel 15, heat resistant members 46 and 49 having a shape corresponding to the shape of each of the receiving grooves 45 and 48 are disposed. Here, the bent portions of the main barrier 13, including the corrugations 41, 44, 47, are made of curved surfaces having a suitable radius of curvature to prevent stress concentration.

In the present invention, the cross-sectional shape of the corrugation portion and the receiving groove accommodating the same may be changed into a semicircle, a semi-ellipse, or various polygons in addition to the above-described modifications.

The heat insulating structure according to the present invention has a corrugated portion for absorbing shrinkage and expansion by heat of the main barrier directly contacting the cryogenic liquid toward the tank wall, and is thus resistant to deformation due to sloshing of the cryogenic liquid.

The present invention described above is not limited to the configuration and operation as shown and described. That is, the present invention is capable of various changes and modifications within the spirit and scope of the appended claims.

1 is a perspective view showing a heat insulating panel of a heat insulating structure according to an embodiment of the present invention.

Figure 2 is a side cross-sectional view showing a state in which the thermal insulation structure is coupled to the tank wall according to an embodiment of the present invention.

Figure 3 is a side cross-sectional view showing a state in which the thermal insulation structure is coupled to the tank wall according to another embodiment of the present invention.

Figure 4 is a side cross-sectional view showing a state in which the thermal insulation structure is coupled to the tank wall according to another embodiment of the present invention.

5 is a perspective view showing a heat insulation panel of the heat insulation structure according to another embodiment of the present invention.

6 to 8 are cross-sectional views showing various modifications of the pleats provided on the main barrier of the heat insulating structure according to the present invention and the receiving groove for receiving the same.

<Explanation of symbols for the main parts of the drawings>

10 tank wall 11 insulation structure

12 Insulation panel 13 Main barrier

14: outer panel 15: outer panel

16: secondary barrier 17: outer protective plate

18: outer heat insulating material 19: inner protective plate

20: inner heat insulating material 21: support pad

23: receiving groove 24: curved portion

26: wrinkles 27: gaps

28: heat-resistant member 32: bent portion

35: reinforcing member

Claims (10)

In the insulating structure of the cryogenic liquid storage tank coupled to the inner surface of the tank wall of the cryogenic liquid storage tank to insulate the storage space for storing the cryogenic liquid, An insulation panel coupled to the tank wall to prevent thermal movement between the tank wall and the storage space and having a plurality of receiving grooves; And A cryogenic liquid storage tank, comprising: a main barrier having a plurality of corrugations that protrude toward the tank wall and are inserted into the plurality of receiving grooves so as to directly contact the cryogenic liquid stored in the storage space; Thermal insulation structure. The method of claim 1, The heat insulation panel includes a plurality of outer panels having an outer protection plate coupled to the tank wall and an outer insulation material coupled to the outer protection plate, an inner protection plate coupled to the main barrier, and a plurality of inner insulations coupled to the inner protection plate. Including an inner panel, The plurality of receiving grooves are formed between the plurality of inner panels, Insulating structure of the cryogenic liquid storage tank further comprises a heat-resistant member disposed between the corrugated portion and the inner panel to fill the gap formed between the plurality of inner panels. The method of claim 2, The inner protective plate is a heat insulating structure of the cryogenic liquid storage tank, characterized in that it has a bent portion inserted into the receiving groove so as to support the pleats. The method of claim 3, wherein The inner protective plate is a heat insulating structure of cryogenic liquid storage tank, characterized in that made of a fiber-reinforced composite material. The method of claim 2, The heat-resistant member is a heat insulating structure of cryogenic liquid storage tank, characterized in that made of a glass fiber, glass fiber-phenolic composite material, phenol foam, plywood, phenol-impregnated plywood. The method of claim 1, Insulating structure of the cryogenic liquid storage tank further comprises a reinforcing member inserted into the receiving groove to support the pleated portion disposed between the pleated portion and the inner panel. The method of claim 1, Cross-section of the receiving groove and the corrugated portion is a heat insulating structure of cryogenic liquid storage tank, characterized in that consisting of a shape selected from a semi-circular, semi-elliptic, polygonal. The method of claim 7, wherein The bent portion of the main barrier is a heat insulating structure of the cryogenic liquid storage tank, characterized in that consisting of a curved surface to prevent stress concentration. The method of claim 1, The insulating structure of the cryogenic liquid storage tank, characterized in that a plurality of channels are formed in the insulating panel so that a passage through which the fluid flows between the insulating panel and the main barrier is formed. A tank wall in which a storage space for storing cryogenic liquid is formed; An insulation panel coupled to the tank wall to prevent thermal movement between the tank wall and the storage space and having a plurality of receiving grooves; And A cryogenic liquid storage tank, comprising: a main barrier having a plurality of corrugations that protrude toward the tank wall and are inserted into the plurality of receiving grooves so as to directly contact the cryogenic liquid stored in the storage space; .

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