RU2669083C2 - Liner for cryogenically liquefied substances - Google Patents

Abstract

FIELD: package and storage.

SUBSTANCE: invention relates to the tank for storing liquefied gas, which comprises the closed concrete casing (1) for accommodating the container (2), the walls of which are at a distance from the inner wall of the concrete casing (1), the concrete casing (1) in the wall region is provided on the inner side with the sheet steel liner (3), which is characterized in that the liner (3) is made of thin strips (6) of sheet steel, the adjacent edges (6.1) of which are gas-tightly connected to each other by means of the clamping connection.

EFFECT: invention is aimed at creating the gas-tight liner, which is efficient during its manufacturing and less labor-intensive for its installation.

15 cl, 6 dwg

Description

The invention relates to a lining of a reservoir for cryogenic liquefied substances, in particular a reservoir for storing liquefied gas, in which a container filled with a liquefied substance is surrounded by a closed concrete shell.

At present, a gas-tight lining (so-called liner) of approximately 5 mm thick sheet steel is provided on the inside of the concrete shell of the liquefied gas storage tank. During operation, the lining prevents the escape of gas from the leaky concrete shell, as well as the penetration of moisture into the insulation of the tank, which is usually located between the tank filled with liquefied gas and the concrete shell. With possible leakage of the tank, the lining prevents gas leakage, as well as the leakage of cryogenically liquefied gas through the concrete shell to the outside. The lining is made of continuously welded to each other metal sheets, which are usually welded to a concreted steel strip. Such a lining of welded, relatively thick, metal sheets with a concrete shell construction height of 10 m to 25 m, or in some cases up to about 40 m, is associated with high costs for material, processing and installation.

The objective of the invention is to provide a reservoir for storing liquefied gas with a gas-tight lining, which can be manufactured economically, and which can be mounted with little effort.

This problem is solved using a tank for storing liquefied gas according to independent claim 1. The dependent claims relate to preferred embodiments of a liquefied gas storage tank.

Accordingly, a reservoir for storing liquefied gas is provided, comprising a closed concrete shell for accommodating a container whose walls are spaced from the inner wall of the concrete shell, the concrete shell in the wall region being provided with a sheet steel plate on the inside. According to the invention, the lining is made of thin strips of sheet steel, the adjacent edges of which are gas tightly connected to each other by means of a clamping connection. Thus, laborious welding is largely prevented in order to carry out the gas-tight lining. Due to the clamping connection, changes in the size of the strips of sheet steel caused by temperature changes can be perceived. Closed concrete shell in the framework of the invention may also assume that the concrete shell in the bottom area and in the side wall region consists of concrete, and the roof has a different material, such as steel.

Preferably, the edges of adjacent strips of sheet steel are joined by clamping on a support beam under the intermediate gas seal layer. The support beam may be formed by means of a pressure-treated sheet metal, for example, by bending. However, referring to the support beam, we can also talk about the extruded profile, which preferably is an economical standard extruded profile.

As a gas seal, a gas tight seal in the form of a tape can be used. However, it is also possible to use a liquid seal material, which is preferably applied to the support beam.

The support beam or extruded profile preferably has a C-shaped cross section with preferably inwardly curved edge regions which are suitable for adhering to the seal and adjacent edge regions of the steel sheet strips. Therefore, preferably, the edge regions of the C-shaped profile are bent inward by approximately 90 °. Can also be used hollow profiles, for example, with a rectangular cross-section. Therefore, preferably the inwardly curved edge regions of the extruded profile or support beam overlap with the edge regions of the steel sheet strips and are connected to each other by a clamping device.

The clamping connection can be implemented by any type of power-closure connection technique, such as screws, double gripping (bending of the edges into each other), spring clips, for example, in the form of clamping bars.

In a preferred embodiment, the support beam for the edge regions of the sheet steel strips is formed by a C-shaped cross section of the sheet steel profile, the inwardly curved edge regions of which overlap with the edge regions of the sheet steel strips and are connected to each other by means of a clamp bar.

In another preferred embodiment of the liquefied gas storage tank, the support beam is formed by a hollow profile on which the clamp profile is fixed with screws under the intermediate layer of the edge regions of the steel sheet strips. The clamping profile preferably has a U-shaped cross section. In this embodiment, there is a gas seal between the clamping profile and the strips of sheet steel, and also between the strips of sheet steel and the support beam.

Preferably, the support beam for sheet metal strips is fixed between curved brackets that are mounted on a concrete shell. The support beam and the brackets can be gas tightly connected to each other by means of mutual gripping (bending of the edges into each other).

However, an embodiment is also possible in which the support beam for strips of sheet steel is fixed directly, that is, directly to the concrete shell - without the use of brackets. To secure the support beam or staples to the concrete sheath, all types of power short circuit connections are possible. For example, a support beam or staples may be poured into a concrete shell. It is also possible to connect with preferably pre-pressed fingers or with screws, preferably with dowels.

Between the strips of sheet steel and the concrete shell, an insulating material, for example, mineral wool or insulating foam, for example, made of polyurethane, can be provided. Also perlite or foam glass (cellular glass) can be used as an insulating material. Also, other filling materials, which are not typical insulating materials, can be used to fill the gap between the strips of sheet steel and the concrete shell, for example, all types of bulk materials. Economical chipboards can also be used. If the support beams have an empty space, for example, in the case of hollow profiles, then it can also be filled with the above insulating or filling materials.

The strips of sheet steel that form the lining of the liquefied gas storage tank are preferably unwound from rolls. As a result of this, it is possible to process strips of sheet steel without seams for the required height, as a rule, from 10 to 40 m. Thus, the percentage of seams of the finished surface can be kept insignificant.

The steel strip is preferably made of carbon steel. It is insensitive to Cl ^- chloride ions, which are typically found in used concrete material. Stainless steel can also be used as strip material. Preferably, the strips of sheet steel have a sheet thickness of from 0.5 to 3 mm. The width of the strip of sheet steel is preferably from 0.5 to 2.5 m, most preferably 1.5 or 2 m.

Preferably, the strips of sheet steel are provided on one side or on both sides with an anti-corrosion coating. The coating may be formed of varnish, rubber coating or laminate. Stainless steel strips can be coated with, for example, a layer of zinc.

A strip of sheet steel strips may extend along the entire (vertical) side wall of the concrete shell. Lining under the container is also possible.

In the liquefied gas storage tank of the invention, adjacent strips of sheet steel in their connection region are preferably gas tightly closed, preferably by a sealing strip. In this case, the sealing strip can be connected to adjacent strips of sheet steel by means of an adhesive or clamping connection. The sealing strip may be formed, for example, from a metal sheet, preferably from steel, or from a plastic mat. The empty space behind the sealing strip can be used to control leaks, due to the fact that it is preferably equipped with continuous flushing (purging).

Next, an exemplary embodiment of the invention is explained in more detail using the drawings, which show:

FIG. 1 is a cross-sectional view of a reservoir for storing liquefied gas with a concrete shell;

FIG. 2 is a perspective view of a wall section of a concrete shell with a lining;

FIG. 3 is a cross section along line A-A of FIG. 2 through the junction region of two adjacent steel sheet strips;

FIG. 4 is a cross-sectional view of another embodiment of a joint region;

FIG. 5 is a cross-sectional view of a further embodiment of a joint region; and

FIG. 6 is a cross-sectional view of the upper end of a sheet steel strip.

FIG. 1 shows a monolithic concrete shell 1 of a conventional cylindrical shape, in which there is a container 2 for receiving cryogenic liquefied substances, in particular liquefied natural gas (LNG), which is stored at a temperature of approximately minus 164 ° C. The side wall of the concrete shell 1 is provided with a gas-tight lining 3, which forms a sealing coating. An insulating material 4 or a filling material 4 may be provided between the container 2 and the concrete shell 1. However, it does not have to be present.

Reference numeral 5 denotes a steel bowl in the bottom region of the concrete shell 1, which serves to receive the liquefied gas exiting the tank 2 and is made in the form of an insulated steel bath, which is shown in FIG. 1 is only schematic. The LNG container 2, which is open at the top, is equipped with a protective cap 2.1, on which the insulating material 4 is laid. Reference numeral 2.2 by means of dashed lines indicates the suspension elements 2.2 for the protective cap 2.1.

Typically, the lining 3 is made of welded steel sheets with a thickness of approximately 5 mm, which are gas-tightly welded to the steel bowl 5. This requires laborious welding, so that the manufacture as a whole is associated with high costs and significant installation time.

According to the invention, the lining 3 is made of interconnected by clamping thin strips of sheet steel, as shown schematically in FIG. 2-5.

FIG. 2 shows a perspective view of the metal plate 3 of the concrete shell 1. The plate 3 is made of vertically extending steel sheet strips 6, the sheet thickness of which can be between approximately 0.5 mm and 3 mm and, for example, is 0.63 mm. The individual steel sheet strips 6 are gas tightly connected to each other through the joint region 7, which in FIG. 3 is a schematic cross-sectional view.

On the concrete shell 1, the brackets 8 made of sheet steel, bent in the edge region of the strips 6 of sheet steel, are secured, for example, with dowels and screws 8.1 or mounting fingers on the concrete shell 1, which are located at a predetermined distance from each other. Between adjacent brackets 8, a support beam 9 is fixed in the form of an approximately C-shaped cross-sectional profile 9 of sheet steel, the inwardly curved edge sections 9.1 of which overlap with the edge sections 6.1 of the strips 6 of the sheet steel. A clamping bar 10 is provided in the overlap region, which presses against each other the edge regions 6.1 of the steel sheet strips 6 and the edge regions 9.1 of the C-shaped profile 9. In the overlap region between the edges 6.1 and 9.1, there is provided a sealing tape which is impermeable to gas .

The brackets 8 in the embodiment of FIG. 3 are gas-tightly connected to the side wall of the C-shaped profile 9 by means of mutual gripping (bending of the edges into each other), and the sheet metal of the C-shaped profile is deformed, but not pierced. The brackets 8, which can be provided, for example, at a distance of approximately 2 m in the longitudinal direction of the strips 6 of sheet steel, serve to fix the support beams 9 on the wall of the concrete shell 1.

By means of a gas seal 11 between the overlapping edges 6.1 of the steel sheet strips 6 and the edges 9.1 of the C-shaped profile 9, the latter forms a gas-tight extension of the steel sheet strips 6 in the joint region 7.

The empty space between the strips 6 of sheet steel and the concrete shell 1 can be provided with a correspondingly rigid insulating material or a filling material 12 under the influence of pressure, in order to be able to withstand excessive pressure in the inner space. Preferably, the connection region 7 is sealed gas tightly by a sealing strip 13, so that even in the open support beam, an insulating material or a filling material 12.1 can be provided in the form of a C-shaped profile 9. A sealing strip 13 covering the clamping strips 10 is connected to adjacent strips 6 of sheet steel, preferably by gluing. The sealing strip 13 forms a second sealing plane. The empty space in the C-profile 9 can also be used for leakage monitoring.

As shown in FIG. 1 shown in FIG. 2 and 3, the lining 3 of the steel sheet strips 6 extends along the inner wall of the concrete shell 1 from the approximately domed roof of the concrete shell 1 up to the region of the gripping steel bowl 5, and a seal can be provided between the steel bowl 5 and the lining 3 along the inner perimeter concrete shell 1. The steel bowl 5 can also be gas-tightly welded with strips 6 of the steel sheet of the casing 3. In contrast to the one shown in FIG. 1 of the embodiment, the lining 3 can also extend up to the bottom of the concrete shell 1, so that the entire (vertical) side wall of the concrete shell 1 has a lining on its inner side.

The steel strip 6 is preferably provided on one side or on both sides with an anti-corrosion coating. At the upper and lower ends of the sheet steel strip 6, they are connected to the seals by means of clamp profile structures in accordance with the clamp connection in FIG. 3 and 4. For example, support beams or strips 14 can extend across to the vertical supporting beams 9, 90, to which the ends of the steel sheet strips 6 are clamped against gas. A similar end portion is shown in FIG. 6, which shows a cross section of the upper end of the sheet steel strip 6. The support beam 14 is a C-shaped extruded profile that is gas-tightly connected to the concrete shell 1. In this embodiment, the support beam 14 is welded to a steel sheet 22 that is poured into the concrete shell 1 or gas-tightly connected to the concrete shell 1 in a different way. The steel sheet strip 6, by means of a clamping strip 15 with a C-shaped cross section, which is also an extruded profile, is pressed by means of a clamping connection 17, such as a screw connection, to the support beam 14. As between the support beam 14 and the upper edge of the sheet 6 strip steel, and between the upper edge of the strip 6 of sheet steel and the clamping bar 15 in each case there is a seal 16. It can be, for example, a sealing tape.

Due to the clamping joint, expansion or contraction of the material due to temperature changes can be perceived without the gas seals provided in the clamping joint becoming leaky.

FIG. 4 shows a modified embodiment of the connection region 7 between adjacent steel sheet strips 6, with an approximately rectangular cross-section hollow profile 90 fixed between the L-brackets 8, for example, a pressed profile, over which adjacent sheet metal strips 6 extend over the edge region. The edge regions 6.1 of the strips 6 of sheet steel are pressed through the U-shaped cross-section of the clamping profile 91 to the hollow profile 90 by means of screws 91.1. Preferably, a gas seal 11 is provided between the clamping profile 91 and the steel sheet strips 6, as well as between them and the hollow profile 90.

FIG. 5 shows a cross-sectional view of another embodiment of a connection region 7 between adjacent strips 6 of sheet steel sheet 3. The support beam 190 is a C-shaped extruded profile, which has inwardly curved edge portions 190.1, in which the edge portions 6.1 with a clamping device 20 fixed under the intermediate layer of the gas seal 11. In this embodiment, the support beam 190 is fixed directly to the concrete shell 1 by means of a screw connection 21 with dowels. The connection area 7 is gas tightly closed by a sealing strip 13 of plastic or metal sheet. The sealing strip 13 is glued to the strips 6 of sheet steel. Insulating material or filling material 12 is optional. Support beam 190 may be provided, which, however, is not shown in FIG. 5, a filler of an insulating material or a filling material according to the reference numbers 12 or 12.1 in FIG. 1-4.

The lining 3 of the strips 6 of sheet steel may have a height of from 10 m to 25 m, or in some cases up to about 40 m in accordance with the height of the concrete shell 1, the strips of sheet steel may have a width of 1.5 m. Strips 6 of sheet steel they are unwound from rolls and processed along the height without seams in order to keep the percentage of seams of the finished surface insignificant and to prevent compaction of cross joints.

LIST OF REFERENCE POSITIONS

1 concrete shell

2 capacity

2.1 protective cap

2.2 hanging element

3 trim

4 insulating material

5 steel bowl

6 strip of sheet steel

6.1 edge section of a strip of sheet steel

7 connection area

8 bracket

8.1 screw and dowel

9 support beam, sheet steel profile

9.1 curved edge

10 clamping plate

11 gas seal (sealing tape)

12 insulating material, filling material

12.1 insulating material

13 sealing strip (seals)

14 support beam, extruded profile

15 clamping bar

17 clamp connection

16 seal

20 clamping device

21 screw connection

22 steel sheet

90 support beam, hollow profile

91 clamping profiles

91.1 screws

190 support beam

190.1 curved edge

Claims (18)

1. A tank for storing liquefied gas, including a closed concrete shell (1) to accommodate a tank (2), the walls of which are located at a distance from the inner wall of the concrete shell (1), and the concrete shell (1) in the wall region is provided on the inner side with a lining (3) of sheet steel, characterized in that the lining (3) is made of thin strips (6) of sheet steel, the adjacent edges (6.1) of which are gas tightly connected to each other by means of a clamping connection. 2. A tank for storing liquefied gas according to claim 1, characterized in that the edges (6.1) of adjacent strips (6) of sheet steel are connected by clamping on a support beam (9, 90, 190) under an intermediate layer of gas seal (11). 3. A reservoir for storing liquefied gas according to claim 2, characterized in that the support beam (9) for the edge regions (6.1) of the strip (6) of sheet steel is formed by a C-shaped cross-section of a sheet of steel sheet, the edge regions bent inward (9.1) which overlap with the edge regions (6.1) of the strips (6) of sheet steel and are connected to each other by means of a clamping bar (10). 4. A reservoir for storing liquefied gas according to claim 2, characterized in that the support beam is formed by a hollow profile (90), on which the clamping profile (91) is fixed with screws (91.1) under the intermediate layer of the edge areas (6.1) of the strips (6) ) sheet steel. 5. The tank for storing liquefied gas according to any one of paragraphs. 2-4, characterized in that the support beam (9, 90) for the strips (6) of sheet steel is fixed between curved brackets (8), which are mounted on a concrete shell (1). 6. The tank for storing liquefied gas according to any one of paragraphs. 2-4, characterized in that the support beam (190) for strips (6) of sheet steel is fixed directly to the concrete shell (1), in particular by means of a screw connection (21). 7. A reservoir for storing liquefied gas according to claim 1, characterized in that an insulating or filling material (12) is provided between the strips (6) of sheet steel and the concrete shell (1). 8. A reservoir for storing liquefied gas according to claim 2 or 4, characterized in that the support beam (90, 190) is formed by means of a pressed profile. 9. The tank for storing liquefied gas according to claim 8, characterized in that the support beam (190) or extruded profile (190) is made in the form of a C-shaped in cross-section of the profile with the edge regions bent inward (190.1). 10. The tank for storing liquefied gas according to claim 9, characterized in that the inwardly curved edge regions (190.1) of the extruded profile (190) or support beam (190) overlap with the edge regions (6.1) of the sheet steel strips (6) and are connected to each other with another by means of a clamping device (20). 11. A reservoir for storing liquefied gas according to claim 1, characterized in that the strips (6) of sheet steel are unwound from rolls. 12. A reservoir for storing liquefied gas according to claim 1, characterized in that the strip (6) of sheet steel has a sheet thickness of 0.5 mm to 3 mm. 13. A reservoir for storing liquefied gas according to claim 1, characterized in that the width of the strips (6) of sheet steel is from 0.5 m to 2.5 m, in particular 1.5 m or 2 m. 14. The reservoir for storing liquefied gas according to claim 1, characterized in that the strip (6) of sheet steel is made of carbon steel. 15. A reservoir for storing liquefied gas according to claim 1, characterized in that the adjacent strips (6) of sheet steel in their connection region (7) are gas tightly closed by a sealing strip (13).

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