KR102354903B1 - Suspended deck for lng tank - Google Patents

Abstract

The present invention relates to a suspended deck for an LNG tank, and is a suspended deck for an LNG tank that is installed from the ceiling of the roof of the LNG tank to insulate the outside and the inside of the LNG tank. A plurality of struts and trusses forming a plurality of truss structures A deck panel having a plurality of cover panels disposed in the structure, wherein a plurality of cover panels are coupled and installed to a plurality of struts so that the plurality of panels are partitioned into different regions, and a plurality of struts and a cover panel are combined in the deck panel It includes a panel coupling part. The present invention is a stable cooling structure to maintain liquefied natural gas (LNG) in an ultra-low temperature state of -162° C., and provides the advantage of ensuring sufficient airtightness and stability for combustible gas.

Description

Suspended deck for LNG tank

The present invention relates to a suspended deck for an LNG tank, and more particularly, to a suspended deck for an LNG tank installed at an upper portion in a tank for maintaining a low temperature state of liquefied natural gas stored in an LNG (Liguefied Natural Gas) tank. .

Recently, the demand for energy has been rapidly increasing, and accordingly, there have been many efforts around the world to secure sufficient energy and provide a stable supply of energy.

Among many energy sources, liquefied natural gas (LNG) is known to be much more practical than liquefied petroleum gas (LPG) or other liquefied gases when consumed in large quantities because it has the same chemical composition as natural gas.

In addition, since liquefied natural gas (LNG) is a liquefied gas and occupies only about 1/600 of a volume compared to when it is in a gas form, it has the advantage that a large amount of storage and transportation is possible.

Such liquefied natural gas (LNG) is made by cooling the natural gas to below the boiling point of -162°C, and stored in a double-walled low-temperature container at atmospheric pressure or a pressure slightly higher than this.

Recently, as a part of stably supplying natural gas to consumers, there is a demand for an LNG storage facility that can stockpile and store liquefied natural gas (LNG).

The existing LNG tank is a facility that is installed above ground or semi-underground, and is nothing more than a relay facility for piping that transports liquefied natural gas (LNG) rather than a facility to stockpile and store liquefied natural gas (LNG). also wrote

Since ground or semi-terrestrial LNG tanks have no choice but to occupy a lot of space on the ground, there is a big limitation in terms of site utilization, and in particular, in the case of a country with a small territory like Korea, the practicality is greatly reduced. In addition, unlike other civil structures, it has a very large economic and social impact when damaged or destroyed.

In addition, the LNG tank should be designed to secure sufficient airtightness and stability against combustible gas as well as a cooling structure for maintaining liquefied natural gas (LNG) in a cryogenic state. There was a problem that proper design and construction for function, airtightness and stability were not made.

An object of the present invention is to provide a stable cooling structure for maintaining liquefied natural gas (LNG) in a cryogenic state, and to provide a suspended deck for an LNG tank in which sufficient airtightness and stability against combustible gas are secured.

An object of the present invention is to provide a suspended deck for an LNG tank that is installed in the upper portion of the internal space of the tank and provides a solid coupling structure to the tank ceiling of the deck for maintaining an appropriate temperature of liquefied natural gas (LNG).

The objects of the present invention are not limited to the above-mentioned objects, and other objects and advantages of the present invention not mentioned may be understood by the following description, and will be more clearly understood by the examples of the present invention. Further, it will be readily apparent that the objects and advantages of the present invention may be realized by the means and combinations thereof indicated in the claims.

As a solution for solving the above technical problem, a suspended deck for an LNG tank according to the present invention is installed hanging from a ceiling of a roof of an LNG tank to insulate the outside and the inside of the LNG tank. A deck panel comprising a plurality of struts forming the truss structure of the deck panel and a plurality of cover panels disposed on the truss structure, wherein a plurality of cover panels are coupled to the plurality of struts, whereby the plurality of panels are partitioned into different regions; and a panel coupling part for coupling the plurality of struts and the cover panel in the deck panel, wherein the panel coupling part is provided along the upper surface central portion of the strut, and is formed in a concave shape in the upper surface central portion of the strut, and has a concave shape a coupling receiving part in which the center of the bottom of the convexly protrudes; a coupling curved portion provided at an end of the cover panel and disposed toward the central portion of the coupling receiving portion, the coupling portion having a shape corresponding to the shape of the bottom of the coupling receiving portion; But corresponding to the inner shape of the coupling receiving portion, received in the coupling receiving portion is in contact with the coupling curved portion, the barten having a height corresponding to the cover panel; and a fastening member coupled to the strut through the batten.

The strut may include a horizontal member; a vertical member vertically connected along a central portion of the horizontal member; and a coupling member horizontally connected to the central portion of the upper end of the vertical member to correspond to the horizontal member, wherein the coupling member extends from the upper end of the vertical member to both sides and is curved to provide the coupling receiving portion. ; a horizontal extension plate extending laterally from the upper end of the curved support plate; and a round protrusion provided to protrude from the upper center of the curved support plate, wherein a reinforcing connection portion extending in cross section to support the round protrusion is provided on the vertical plate, and a coupling hole portion to which the fastening member is coupled to the reinforcing connection portion It is appropriate to form

Both ends of the coupling member may include a downward inclined surface.

The barten, the central lower portion is convex to the upper portion so as to have a shape corresponding to the coupling receiving portion, and both sides are convex downwardly but a pressing portion having a curved shape corresponding to the curved support plate; and an upper panel connected to both ends of the pressing unit to close the upper surface of the pressing unit, a hole corresponding to the fastening member is provided, and an upper panel having a flat shape corresponding to the cover panel.

The present invention provides a plurality of gasket plates respectively coupled to the upper and lower surfaces of the plurality of struts to radially fix the plurality of struts; a hanger rod coupled to the central portion of the upper surface of the plurality of gasket plates and connected to the ceiling of the tank; and a connection bracket coupled to the gasket plate and to which the hanger rod is connected.

The present invention may further include a sealant disposed on the strut at the outer end of the gasket plate to seal the gap between the strut and the gasket plate.

According to another aspect of the present invention, there is provided an LNG tank comprising a suspended deck for the LNG tank.

According to the present invention, there is an advantage in that a stable cooling structure for maintaining liquefied natural gas (LNG) in a cryogenic state is provided, and sufficient airtightness and stability with respect to combustible gas are secured.

In addition, according to the present invention, it is easy to secure the stability of the structure while the storage capacity of the LNG tank is large, and the deck panel composed of a plurality of triangle decks can support the weight of the operator, so maintenance is easy and the load is distributed efficiently There are possible advantages to this.

In addition, according to the present invention, there is no need for welding, so welding cost is reduced, there is ease of assembly and safety, reliable quick installation is possible, excellent durability, easy follow-up management and maintenance, and structurally It is simple and does not generate thermal stress, the number of parts is reduced, and there are advantages of easy maintenance and replacement of parts.

1 is a conceptual diagram of an LNG tank according to an embodiment of the present invention.
2 is a plan view, a front view, and a partial enlarged view of a planar area of the suspended deck for an LNG tank of FIG. 1 .
3 is an enlarged view of the connection area (A) of the struts and the gasket plate of FIG.
FIG. 4 is a cross-sectional view II-II showing the panel coupling part of FIG. 3 .
Fig. 5 is the strut of Fig. 4;
6 is a detailed view of the coupling of the deck panel and the hanger rod of FIG.
7 is a cross-sectional view showing a panel coupling unit according to another embodiment of the present invention.

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to indicate the same or similar components.

Referring to Figure 1, the LNG tank to which the suspended deck 120 of this embodiment is applied, the storage unit 100 is formed extending vertically from the upper surface of the bottom to form an internal space for storing liquefied natural gas; The above-described deck panel 130 installed in the upper part of the storage unit 100 so as to maintain an appropriate temperature of the concrete roof 110 installed on the storage unit 100, and liquefied natural gas stored in the internal space. include

The storage unit 100 includes an outer tank 101 extending from the bottom, a heat insulating material provided on an inner wall of the outer tank 101, and an inner tank 102 installed on an inner surface of the heat insulating material.

The deck panel 130 is preferably pre-fabricated with a thickness of 500 to 700 mm thick, and it is possible to efficiently distribute the load compared to the conventional rectangular type.

On the other hand, the LNG tank according to the present invention is a double tank and is composed of an inner tank 102 (internal storage unit, Inner Tank) and an external tank 101 (external storage unit, Outer Tank), and includes an inner tank 102 and an outer tank. The tank 101 is designed and constructed to independently store cryogenic liquefied natural gas (LNG), and the external tank 101 performing a dike function is 1 m to 1 m from the internal tank 102. Located between 2 m, the inner tank 102 stores cryogenic liquefied natural gas (LNG) under normal operating conditions, and the outer roof 110 refers to a storage tank of a type supported by the outer tank 101 .

The external tank 101 (external storage unit) is designed to not only store cryogenic LNG when the internal tank 102 is damaged, but also to control the boil-off gas of LNG to vent it.

That is, even in the event of a leak from the inner tank 102 , it is possible to store and control all of the liquid and vapor leaked from the outer tank 101 , so it is a high-stability tank that does not require a separate discharge embankment.

In the LNG tank, since the PSC (prestressed) external tank 101 (discharge embankment function) is designed to be close to the internal tank 102, if LNG leaks from the internal tank 102, the external tank 101 It is a storage tank with high stability because there is no expansion of the leaked liquid level and its influence is limited.

In addition, since the space between the LNG tank body and the PSC external tank 101 is unnecessary, it is possible to increase the capacity, and there is an advantage in that the use efficiency of the site can be increased. In addition, since the LNG tank body and the base of the discharge embankment are shared, and the external tank 101 is self-supporting, there is an advantage that a reasonable structural design such as a structure in which a liner is attached to the inner surface of the PSC external tank 101 is possible. On the other hand, the external tank 101 (external storage unit) may use prestressed concrete.

1 to 5 , the suspended deck 120 for an LNG tank according to an embodiment of the present invention is installed hanging from the ceiling of the roof 110 of the LNG tank to insulate the outside and the inside of the LNG tank. As a suspended deck 120 for a tank, a plurality of cover panels 150 are coupled to a plurality of struts 140, so that a plurality of panels are partitioned into different areas. A deck panel 130, and a deck panel 130. Including a panel coupling unit 160 for coupling the plurality of struts 140 and the cover panel 150 .

The deck panel 130 is provided with a plurality of struts 140 forming a plurality of truss structures and a plurality of cover panels 150 disposed on the truss structure, and forms a space between the tank roof 110 and the tank. And, it is insulated to block heat transfer from the roof 110 side to the storage space of the LNG tank.

The deck panel 130 is arranged in a flat shape on the upper part of the LNG tank, separating the upper space and the lower space of the LNG tank and performing a shielding role, and is hung from the roof 110 of the tank to maintain a horizontal shape The cover panel 150 is closely coupled to the struts 140 forming the truss structure so as to block the flow of heat and fluid between the upper space and the lower space of the LNG tank. This deck panel 130 has a strong and efficient airtight structure and thus has high thermal insulation properties, so that it is not affected by condensation due to the temperature difference between the upper part and the lower part of the tank.

The struts 140 have a beam shape in which the cover panel 150 is supported and firmly coupled, and the cover panel 150 is made of a triangular-shaped aluminum material. Since it is suspended from the roof 110 together with the strut 140 or the cover panel 150, it may be made of a lightweight metal material.

The strut 140 is a horizontal member 141, a vertical member 143 connected upright along the central portion of the horizontal member 141, and horizontally connected to the central portion of the upper end of the vertical member 143 in correspondence to the horizontal member 141. member 145 .

The vertical member 143 is preferably formed in an 'I' shape or an 'H' shape, but the shape of the vertical member 143 is not limited thereto.

The panel coupling unit 160 provides a structure in which the cover panel 150 is tightly coupled to both sides on the struts 140 having a triangular structure, and includes the strut 140 and a portion of the cover panel 150 . .

The panel coupling unit 160 is provided along the central portion of the upper surface of the strut 140 and provided at the end of the coupling receiving portion 161 and the cover panel 150 formed in a concave shape in the center of the upper surface of the strut 140 for coupling. Fastening coupled to the strut 140 through the coupling curved portion 162 disposed toward the central portion of the receiving portion 161, the baten 170 corresponding to the inner shape of the coupling receiving portion 161, and the baten 170 member 165 .

The coupling receiving portion 161 has a concave bottom central portion protruding convexly, and the bottom central portion protruding adjacent to the batten 170 and the fastening member 165, and both sides thereof have a rounded concave shape. The upper ends of both sides of the coupling receiving portion 161 may be in close contact with both ends of the batten 170 by bending the opposite to the concave shape toward the cover panel 150 .

The coupling curved surface portion 162 is a peripheral portion having a shape corresponding to the shape of the bottom of the coupling receiving portion 161 in the cover panel 150, and is in contact with the central portion of the coupling receiving portion 161. It has a round structure corresponding to the shape.

The coupling curved portion 162 is connected to the first curved portion 163 and the first curved portion 163 corresponding to the inclined curved shape of the coupling receiving portion 161 to the bottom portion of the coupling receiving portion 161 . and a corresponding second curved portion 164 . The first curved portion 163 and the second curved portion 164 are formed by bending downward in the cover panel 150 disposed on the strut 140 .

The coupling member 145 of the strut 140 extends from the upper end of the vertical member 143 to both sides and is curved to provide the coupling receiving portion 161. The curved support plate 146, the curved support plate 146 from the upper end of the side It includes a horizontal extension plate 147 that extends to, and a round protrusion 148 that is provided to protrude from the center upper portion of the curved support plate 146 .

The vertical member 143 is provided with a reinforcing connection portion 166 whose cross-section is expanded to support the round protrusion 148, and it is appropriate that the reinforcing connection portion 166 is provided with a coupling hole 167 to which the fastening member 165 is coupled. . Both end portions of the coupling member 145 include downward inclined surfaces, thereby preventing installation interference with the bottom surface of the cover panel 150 .

The horizontal extension plate 147 provides an extended surface capable of sufficiently supporting the cover panel 150 so that the cover panel 150 is stably coupled to the strut 140 and has a structure in which it can be supported by the strut 140 . to provide.

The baten 170 is accommodated in the coupling receiving portion 161 and in contact with the coupling curved portion 162 , and has a hollow or solid cross-sectional shape provided to have a height corresponding to the cover panel 150 , and a pressing and pressing portion 171 . ) and an upper support surface portion 172 .

The pressing portion 171 is convex to the upper portion so that the central lower portion has a shape corresponding to the coupling receiving portion 161 , and both sides are convex to the lower portion, but has a curved surface shape corresponding to the curved support plate 146 .

The upper support surface part 172 is connected to both ends of the pressing part 171 to close the upper surface of the pressing part 171 , and a hole corresponding to the fastening member 165 is provided and corresponding to the cover panel 150 . has a flat shape.

When the fastening member 165 is coupled to the coupling hole 167 in the batten 170 , the upper support surface 172 is elastically pressed by the fastening member 165 , and is pressed and pressed connected to the upper support surface 172 . The part 171 is also elastically pressed toward the curved support plate 146 . The pressing portion 171 presses the coupling curved portion 162 of the cover panel 150 toward the curved support plate 146 to bring it into close contact.

In this way, the structure in which the coupling curved portion 162 of the cover panel 150 is pressed by the batten 170 and is in close contact with the curved support plate 146 is the cover panel 150 and the strut 140 coupled to the strut 140 . ) to block the leakage of fluid between the gaps, and by firmly coupling the cover panel 150 on the struts 140, the cover panel 150 and the struts 140 are separated by vibration or impact or the occurrence of gaps is prevented. do.

Since the batten 170 may be made of a metal material having a resilient hollow structure in which the upper support surface part 172 and the pressing part 171 are elastic, it is elastic to prevent loosening of the fastening member 165 in the coupling hole part 167 . It is also possible to provide a phosphorus tension structure.

1 to 3 and 6 , in the present embodiment, a plurality of gasket plates 181 are respectively coupled to the upper and lower surfaces of the plurality of struts 140 to radially fix the plurality of struts 140 . ), a hanger rod 182 coupled to the center of the upper surface of the plurality of gasket plates 181 and connected to the ceiling of the tank, and a connecting bracket 183 coupled to the gasket plate 181 and connected to the hanger rod 182 This includes more

The plurality of gusset plates 181 are plate-shaped to combine the struts 140 gathered from 4 to 6 directions together to form a triangular shape to which the triangular-shaped cover panel 150 is coupled. is disposed, and is coupled to the strut 140 by fastening bolts disposed on both sides of each of the struts 140 .

A connection bracket 183 to which the hanger rod 182 is connected is coupled to the center of the upper side of the plurality of gasket plates 181 . The hanger rod 182 is connected to the gusset plate 181 through the connection bracket 183 , and is disposed at common vertices of the triangular shape of the deck panel 130 to fix the deck panel 130 to the roof 110 . plays a role in making

The hanger rod 182 is provided with a turnbuckle 185 for adjusting the length, and has an upper bracket 186 connected to the ceiling of the roof 110 at the top thereof.

Meanwhile, in the present embodiment, a sealant 188 disposed on the strut 140 at the outer end of the brace plate to seal the gap between the strut 140 and the gasket plate 181 is further included.

The sealant 188 maintains airtightness at the boundary between the upper and lower surfaces of the gasket plate 181 coupled to the struts 140 , and blocks the flow of fluid through the minute gaps.

Referring to FIG. 7 , the batten 170 according to another embodiment may be provided with round grooves 191 on both lower side portions. Between the batten 170 and the coupling curved portion 162 of the cover panel 150 on the curved support plate 146, a round protrusion 196 coupled to the round groove 191 of the baten 170 is provided, and the curved support plate ( A gasket 195 in close contact with the 146 and the coupling curved portion 162 may be disposed.

The batten 170 presses the gasket 195 toward the curved support plate 146 as the fastening member 165 is coupled to the coupling hole 167, and the gasket 195 is coupled to the curved support plate 146 and the curved portion ( 162), the leakage between the curved support plate 146 and the baten 170 is blocked by being in close contact with the side.

In the coupling panel unit 160 , the sealing structure by the gasket 195 can be sufficiently provided by inserting the round protrusions 196 of the gasket 195 into the round grooves 191 of the batten 170 .

The batten 170 and the airtight structure corresponding thereto as described above are provided to correspond to the outer edge of the cover panel 150 along the longitudinal direction of the strut 140 .

As described above, according to the present invention, the storage unit 100 having an internal space for storing liquefied natural gas, the roof 110 installed on the upper part of the storage unit 100 and the upper part of the internal space of the storage unit 100 . It is installed on the deck and consists of a deck panel 130 for maintaining the proper temperature of liquefied natural gas (LNG), providing a stable insulation structure to maintain liquefied natural gas (LNG) at an ultra-low temperature of -162 ℃, and combustible gas There is an advantage that sufficient airtightness and stability are secured.

In addition, according to the present invention, it is easy to secure the stability of the structure while the storage capacity of the LNG tank is large, and the deck panel 130 composed of a plurality of triangle cover panels 150 is mounted on the roof ( 110), it is possible to support the weight of the operator by being fixed to the ceiling, so maintenance is easy, and there is an advantage of efficiently distributing the load.

On the other hand, since the description of the technology disclosed in this specification is merely an embodiment for structural or functional description, the scope of the disclosed technology should not be construed as being limited by the embodiment described in the text.

As described above, although the present invention has been described with reference to limited embodiments and drawings, the present invention is not limited to the above-described embodiments, which are various modifications and variations from these descriptions by those skilled in the art to which the present invention pertains. Transformation is possible.

Accordingly, the spirit of the present invention should be understood only by the claims described below, and all equivalents or equivalent modifications thereof will fall within the scope of the spirit of the present invention.

100: storage 101: external tank
102: inner tank 110: roof
120: suspended deck 130: deck panel
140: strut 141: horizontal member
143: vertical member 145: coupling member
146: curved support plate 147: horizontal extension plate
148: round protrusion 150: cover panel
160: panel coupling unit 161: coupling receiving unit
162: combined curved portion 163: first curved portion
164: second curved portion 165: fastening member
166: reinforcing connection portion 167: coupling hole portion
170: Batten 171: body panel
172: upper support surface portion 181: gusset plate
182: hanger rod 183: connection bracket
185: turnbuckle 186: upper bracket
188: sealant 191: round groove
195: gasket 196: round bump

Claims (5)

a storage unit 100 extending vertically from the upper surface of the bottom to form an internal space capable of storing liquefied natural gas (LNG); a roof 110 installed on the upper portion of the storage unit 100; The suspended deck 120 for an LNG tank is installed hanging from the ceiling of the roof 110 to insulate the outside and the inside of the LNG tank; A plurality of struts 140 forming a plurality of truss structures and a plurality of cover panels 150 disposed on the truss structure are coupled to each other so that the plurality of panels are partitioned into different areas; and a panel coupling unit 160 for coupling the plurality of struts 140 and the cover panel 150 in the deck panel 130;
The panel coupling unit 160 is
A coupling receiving part 161 formed in a concave shape in the center of the upper surface of the strut 140, and provided at the end of the cover panel 150 and disposed toward the center of the coupling receiving part 161, the diameter of the coupling receiving part 161 The first curved surface is composed of a first curved portion 163 corresponding to a photographic curved shape, and a second curved portion 164 connected to the first curved portion 163 and corresponding to the bottom of the coupling receiving portion 161 . The portion 163 and the second curved portion 164 include a coupling curved portion 162 formed by bending downward in the cover panel 150 disposed on the strut 140 , and an internal shape of the coupling receiving portion 161 . Corresponding to, but accommodated in the coupling receiving portion 161 is in contact with the coupling curved portion 162, the strut 140 through the batten 170 and the baten 170 having a height corresponding to the cover panel 150) Includes a fastening member 165 coupled to,
The strut 140 is
The horizontal member 141, the vertical member 143 connected upright along the central portion of the horizontal member 140, and horizontally connected to the central portion of the upper end of the vertical member 143 in correspondence to the horizontal member 141, both ends includes a coupling member 145 having a downward inclined surface,
The coupling member 145 is
A curved support plate 146 that extends from the upper end of the vertical member 143 to both sides and is curved to provide a coupling receiving part 161, and a horizontal extension plate 147 that extends laterally from the upper end of the curved support plate 146. and a round protrusion 148 protruding from the upper central portion of the curved support plate 146,
The vertical member 143 is provided with a cross-sectional reinforcing connection portion 166 to support the round protrusion 148, and the reinforcing connection portion 166 is provided with a coupling hole 167 to which the fastening member 165 is coupled is formed. A suspended deck for LNG tanks featuring.
The method of claim 1,
The batten 170 is
The central lower part is convex upward to have a shape corresponding to the coupling receiving part 161, and both sides are convex downward, and the pressing and pressing part 171 having a curved shape corresponding to the curved support plate 146;
It is connected to both ends of the pressing unit 171 to close the upper surface of the pressing unit 171 , a hole corresponding to the fastening member 165 is provided, and an upper supporting surface portion having a flat shape corresponding to the cover panel 150 . (172);
When the fastening member 165 is coupled to the coupling hole part 167, the upper support surface part 172 is elastically pressed by the fastening member 165, and the pressing and pressing part 171 connected to the upper support surface part 172 is elastically pressed. A suspended deck for an LNG tank, characterized in that it is pressed toward the curved support plate 146 with the pressing pressing part 171 presses the coupling curved part 162 of the cover panel 150 toward the curved support plate 146 to be in close contact.
The method of claim 1,
A plurality of gusset plates 181 respectively coupled to the upper and lower surfaces of the plurality of struts 140 to radially fix the plurality of struts 140;
A hanger rod 182 coupled to the central portion of the upper surface of the plurality of gasket plates 181 and connected to the ceiling of the tank; and
It is coupled to the gusset plate 181 and further includes a connection bracket 183 to which the hanger rod 182 is connected,
The hanger rod 182 is
A turnbuckle 185 to adjust the length, and
An upper bracket 186 connected to the ceiling of the roof 110 at the top and
Suspended deck for LNG tank, characterized in that it further comprises a sealant (188) disposed on the strut (140) at the outer end of the gasket plate (181).
The method of claim 1,
The batten 170 is
A round groove portion 191 configured on both lower side portions, and
A gasket 195 in close contact with the curved support plate 146 and the coupling curved portion 162 and
Between the coupling curved portion 162 of the cover panel 150 includes a round protrusion 196 coupled to the round groove portion 191,
When the fastening member 165 is coupled to the coupling arc portion 167, the batten 170 presses the gasket 195 toward the curved support plate 146 so that the gasket 195 is coupled to the curved support plate 146 and the curved portion 162 toward the side. Suspended deck for LNG tank, characterized in that it is in close contact.

delete

Images