KR20120120862A - prismatic pressure vessel having plate lattice - Google Patents

Abstract

PURPOSE: An angular pressure tank with a plane lattice structure is provided to endure the high variation of fluid pressure and temperature and to effectively use peripheral spaces by providing a rectangular shaped high pressure tank. CONSTITUTION: An angular pressure tank with a plane lattice structure comprises an angular tank body(50) and a cell structure(100). High pressure fluid is accommodated in the tank body. The cell structure is located inside the tank body and is manufactured into the shape of a lattice in which the cell walls of flat plates are crossed. The cell walls are regularly crossed while being reached from one side wall of the tank body to the other side wall thereof. The cell structure can endure pressure load.

Description

Prismatic pressure vessel having plate lattice

The present invention relates to a pressure tank, and more particularly, a reinforcing member having a surface lattice structure inside a pressure tank of a hexahedron, which can withstand pressure due to gas, and is manufactured in a square shape to have a space efficiency and a material ratio. It relates to a pressure tank having a surface lattice structure that can be increased.

In general, liquefied natural gas (LNG) is known to be a clean fuel and abundant in reserves than petroleum, and its use is rapidly increasing with the development of mining and transportation technology.

In addition, fixed and floating offshore production facilities, offshore production and storage facilities for storage and use of liquefied natural gas (LNG), waterborne transport using ships, fixed and floating offshore inflow terminals and regasification facilities, and onshore inflow terminals and recovery The demand for fire facilities is increasing.

Offshore production facilities and inlet terminals are emerging as new areas in the LNG chain, and a number of projects and ideas are currently being studied.

범위이며, 최대 200000 내지 250000

범위까지도 가능하다고 알려져 있다.Most LNG carriers delivered today range in size from 138000 to 145000

Range, up to 200000 to 250000

It is known to the extent that it is possible.

LNG선에 대한 통상적인 건조 시간은 주요 병목 사항으로서 탱크 시스템의 건조 및 시험으로 인하여 약 20개월 또는 그 이상이다.Long drying times are one of the major problems for existing tank systems. 145000

Typical drying times for LNG carriers are a major bottleneck and are about 20 months or longer due to the drying and testing of tank systems.

Another problem is that the tank structure is subjected to high dynamic pressure due to the wave generated by the motion of the structure and the wave and dynamic motion of the fluid, the magnitude of the dynamic pressure being dependent on the filling rate of the contents, Occurs more severely. This important effect, called sloshing, can cause structural problems in most conventional tanks.

Another challenge for tank systems arises from storing liquefied natural gas as the propulsion fuel for ships. In order to use it as a propellant fuel, liquefied natural gas must be mounted on or inside the ship for a long time, and heat penetration from the outside occurs as time passes, thereby increasing the pressure inside the tank. For this purpose, the storage tank must be a pressure vessel with pressure resistance.

The need for such large pressure vessels is also required for carbon dioxide vessel transportation. Unlike liquefied natural gas that can be liquefied at atmospheric pressure by lowering the temperature, carbon dioxide must be compressed to about 6 atm or higher to liquefy. Therefore, a large pressure vessel as a cargo tank is essential for ship transport of carbon dioxide.

For offshore production facilities, the shape of the tank is very important when the tank is located inside a structure that typically has processing equipment on decks above the facility.

Another important aspect for offshore production facilities is manufacturing and installation. The prefabrication of the tank to be transported to the drying site in one piece or a small number of pieces can reduce the drying time and the associated costs.

Fully prefabricated tanks can also be leak tested before being installed. Conventional membrane tank systems are complex to dry and typically require 12 months or more of drying time, and final structure completion must be performed at the drying site.

For waterborne transport on vessels, the tank system of the membrane tank system and Moss spherical tank system by GTT (Gaz Transport et Technigaz, France) opened the market. Is leading.

The self-supporting SPB tank developed by IHI (Ishikawajima-Harima Heavy Industries Co. Ltd., Japan) is another possible tank system.

The Mohs spherical tank concept was initially developed from 1969 to 1972 using aluminum as the low temperature material.

This design is an independent tank with a partial second barrier. Insulation is typically a polymer foam that is applied to the outer surface of the tank wall. For ships and offshore installations, the Mohs spherical tank concept is limited in volume available by the spherical shape and therefore relatively low in volume efficiency, and is not suitable for installations that require many flat decks on the installation.

Development of the membrane tank system began in 1962 and was further developed by Technigaz. The current system consists of a thin stainless steel or Invar steel first barrier, an insulating layer of a pearlite filled plywood box, an Invar steel or Triplex second barrier and finally a second insulating layer. The stainless steel membrane is corrugated to handle the heat shrink and expansion of the membrane and the Invar steel membrane does not require any corrugation.

For drying, the system is complicated due to the large number of specific parts and a significant amount of welding.

Welding of the membranes and corrugations can be deformed into stress concentrations and stress changes due to both fatigue and sloshing offer potential for leakage. Sloshing that occurs in partially filled tanks can cause leaks in such tanks, so typically 10% to 80% filling is not allowed in sailing conditions.

Sloshing generally provides very high dynamic pressure on the inner wall of the membrane tank, especially in the corner region, which can damage the membrane and the lower insulation. Another weakness is the inability to inspect the second barrier.

The Self-Supporting Prismatic Type-B (SPB) tank developed by IHI is an independent cuboid tank with a partial second barrier designed as a conventional orthogonal reinforcement plate and frame system. Insulation attached to the tank and the outer surface of the tank is disposed on a system of wooden block supports.

The system consists of plates and reinforcement systems consisting of reinforcements, frames, girders, stringers and bulkheads as in conventional designed ship structures. By this structural factor, sloshing is not a problem. On the other hand, fatigue due to significant amounts of internals and local stress concentrations is a problem for such tank systems.

Mobil Oil Corporation has developed a boxed polygon tank for the storage of LNG on land or above ground structures, described in patent application PCT / US99 / 22431.

The tank includes an inner, truss-supported, rigid frame with a cover on the frame to reliably store the stored liquid. The inner, truss-supported, rigid frame is specially designed for the interior of the tank to withstand the dynamic loads generated by the sloshing of the stored liquid due to the short stimulus generated by the seismic activity.

The tank is prefabricated into sections and assembled on site. The tank structure has a number of details and stress concentrations discussed for fatigue life.

For onshore inflow terminals and regasification plants, the market is dominated by cylindrical tanks constructed as single barrier, full barrier or double barrier tanks. The single barrier tank includes an inner tank and an outer tank. The inner tank is a cylindrical wall made of low temperature material, usually 9% Ni steel and with a generally flat bottom. Prestressed concrete and aluminum are also used as internal tanks. The outer tank is generally made of carbon steel which only has the function of keeping the insulation in place and cannot provide significant protection in case of destruction of the inner tank.

Most of the LNG storage tanks manufactured recently in the world are designed as double or full barrier tanks. In this design, the outer tank is designed so as not to leak the contents of the inner tank in case of destruction of the inner tank. For a complete barrier tank, the outer tank or wall is typically dried as a compressive stressed concrete wall spaced 1-2 meters apart from the inner tank with insulating material.

Conventional dried onshore LNG tanks are expensive and must be manufactured in a place with a build time of about one year and where significant local infrastructure is required.

Figure 1 shows a conventional pressure tank, Figure 1a is a spherical pressure tank, Figure 1b is a cylindrical pressure tank, Figure 1c is a lobe type pressure tank, Figure 1d is a cellular pressure tank.

The efficiency of the tank can be judged by the volume efficiency and the material ratio.

[Equation 1]

는 부피효율을 나타내고, 상기

는 탱크의 부피를 나타내며, 상기

는 이상적인 직육면체 형태의 탱크가 갖는 부피를 나타낸다.[Equation 1] is an equation that can obtain the volumetric efficiency. At this time,

Represents volumetric efficiency, and

Represents the volume of the tank, and

Denotes the volume of a tank in the form of an ideal cuboid.

의 값이 높을수록 탱크가 차지하는 부피가 커지며, 더 효율적인 것이다.remind

The higher the value of, the larger the volume the tank occupies and the more efficient it is.

&Quot; (2) "

는 물질비율을 나타내고, 상기

는 탱크의 구성물이 차지하는 물질체적을 나타내며, 상기

는 탱크에 담겨진 유체의 양을 나타낸다.[Equation 2] is a formula that can obtain the material ratio. At this time,

Represents the material ratio, and

Denotes the volume of material occupied by the components of the tank,

Represents the amount of fluid contained in the tank.

의 값이 낮을수록 같은 부피의 탱크를 구성하는 물질의 양이 작으므로, 탱크가 더 효율적인 것이다remind

The lower the value of, the smaller the amount of material that makes up the same volume of tanks, so the tank is more efficient

Pressure tank method

circle 0.52 1.5 Cylindrical 0.78 1.73-2.0 Lobe type 0.85 1.73-2.0 Cellular ≪ 1.0 1.73-2.0

Table 1 is a table showing the volumetric efficiency and material ratio of the conventional tank.

As can be seen in Table 1, the volumetric efficiency of the cellular tank is the most efficient, the material ratio has a similar value for the cylindrical tank, lobe tank, and the cellular tank.

However, the lobe-type tanks are difficult to manufacture because they cross the circular tanks, and are likely to be damaged due to the concentration of stress at the intersections, and there is a problem in forming the outer wall as a double wall.

The cellular tank is almost the same as other types of tanks having a volumetric efficiency, and it is not necessary to increase the thickness of the plate in making a tank of a large capacity, but it is difficult to form a complicated shape in the bending part, There was a problem that there is a risk of breakage due to the concentration of stress.

In addition, in forming the outer wall of the cellular tank as a double wall, there was a problem in design.

The present invention is to solve the above problems, to provide a new type of high-pressure tank having a cuboid shape in more detail, that is, can be extended in any dimension and withstand high pressure and temperature changes of the fluid The purpose is to provide a pressure tank.

In addition, it provides a pressure tank having a high volumetric efficiency, and provides a pressure tank that can prevent the fluid inside the pressure tank from leaking.

In addition, it provides a pressure tank that can reduce the sloshing phenomenon caused by the fluid.

Pressure tank having a surface lattice structure of the present invention accommodates a high-pressure fluid therein, is located in the tank body 50 and the tank body 50 is made in a square, made in a grid form, the tank body It is characterized in that it comprises a cell structure 100 to withstand the pressure load is produced in the shape that the cell wall 110 of the flat plate that is regularly orthogonally arranged to reach the other side wall facing from the one side wall of 50.

In addition, a plurality of holes (not shown) are formed in the cell wall 110 so that the fluid can move freely between the cells.

In addition, the tank body 50 includes an inner wall 20 in which the cell structure 100 is in contact and an outer wall 30 positioned at a predetermined distance from the inner wall, and the inner wall 20 and the outer wall 30. ) Is made of a material having pressure resistance and heat resistance.

In addition, a lattice reinforcing member 21 is formed on at least one of an inner surface of the inner wall 20, an outer surface of the inner wall 20, an inner surface of the outer wall 30, and an outer surface of the outer wall 30. It is characterized in that the location.

In addition, the reinforcing member 21 is made of a cross-section 'ㅗ' shape, characterized in that the upper surface is bonded to the inner wall 20 or the outer wall (30).

In addition, a plurality of plate girders 40 are positioned between the inner wall 20 and the outer wall 30, and the base girders 40 correspond to a portion where the cell structure 100 contacts the inner wall 20. It makes contact with the outside of the inner wall 20, it is characterized in that the other side is in contact with the inside of the outer wall (30).

In addition, a plurality of girders 40 having a 'ㅗ' shape in cross section are positioned between the inner wall 20 and the outer wall 30, and the upper surface of the girder 40 is the cell structure 100 having the inner wall ( The outer wall 30 is in contact with the outside of the inner wall 20 corresponding to the portion in contact with 20, characterized in that the plurality of the outer wall 30 is welded and coupled to the flange 41 of the girder 40.

In addition, the girder 40 is in contact with the outside of the inner wall 20 corresponding to the portion where the cell wall 110 intersects and contacts the inner wall 20.

In addition, a gas detector for detecting a gas is installed between the inner wall 20 and the outer wall 30.

In addition, the heat insulating layer is formed on the outer side of the outer wall (30).

In addition, the pressure tank 10 may be prepared by drying the inner wall 20 and the outer wall 30 in advance of a structure combining a single wall surface or a plurality of wall surfaces.

In addition, by filling the concrete or insulating composite material between the inner wall 20 and the outer wall 30, it is characterized in that the structural reinforcement and increase the thermal insulation performance.

In addition, the cell structure 100 is characterized in that it can be combined in a dry place by making in advance to two or more pieces using the characteristics of the repeated structure.

The present invention is to solve the above problems, to provide a new type of high-pressure tank having a cuboid shape in more detail, that is, it is possible to extend the size in any dimension and to withstand the high pressure and temperature changes of the fluid have.

In addition, a tank having a high volumetric efficiency, that is, the tank is manufactured in a rectangular parallelepiped shape so that the surrounding space can be efficiently used.

In addition, it has a double wall structure, and a gas detector is provided between the outer wall and the inner wall to prevent the fluid from leaking.

In addition, by installing a lattice-like surface structure inside the tank, it is possible to reduce the sloshing phenomenon by the fluid.

1 is a cross-sectional view of a conventional pressure tank
2 is a schematic view of the pressure tank of the present invention
3 is a perspective view of a unit grid of the present invention
Figure 4 is a perspective view of a partial grating pressure tank of the present invention
Figure 5 is a perspective view of the inner wall of the grid lattice pressure tank of the present invention
6 is a first embodiment of the grating pressure tank wall surface of the present invention
7 is a second embodiment of the grating pressure tank wall surface of the present invention

Hereinafter, the technical idea of the present invention will be described more specifically with reference to the accompanying drawings.

However, the accompanying drawings are only examples to illustrate the technical idea of the present invention in more detail, and thus the technical idea of the present invention is not limited to the accompanying drawings.

With reference to FIGS. 2-4, the structure and form of the pressure tank 10 which has the surface grating structure of this invention are demonstrated.

The pressure tank 10 of the present invention is a high-pressure fluid is accommodated therein, the tank body 50 is formed in a rectangular shape and reaches the other side wall facing from one side wall of the tank body 50 is regularly orthogonally arranged The cell structure 120 includes a cell structure 100 that is manufactured in a shape that intersects the cell wall 120.

When one unit having the intersection 114 is positioned at the center of the rectangular parallelepiped having the length of each side of a1, a2, and a3, the unit grid, the cell structure 100 is said that the unit grid 110 is formed repeatedly Can be seen (see FIG. 3).

Therefore, by explaining the shape of the unit grid 110, it is possible to infer the overall shape of the cell structure (100).

More specifically, the cell structure 100 includes a plurality of first cell walls 121 formed in parallel with the XY plane, a plurality of second cell walls 122 formed in parallel with the YZ plane, and a ZX plane. And a plurality of third cell walls 123 formed in parallel with each other.

In addition, the first cell wall 121 is fixed in contact with the end of the wall of the tank body 50 formed in parallel with the YZ plane and the inner wall of the pressure tank of the pressure tank formed in parallel with the ZX plane, The second cell wall 122 contacts an inner wall of the tank body 50 of the tank body 50 formed in parallel with the wall of the tank body 50 formed in parallel with the XY plane and the ZX plane. And the third cell wall 123 is an inner wall of the tank body 50 of the tank body 50 formed in parallel with the wall of the tank body 50 formed in parallel with the XY plane and the YZ plane. Is fixed in contact with the end.

In addition, the first cell wall 121, the second cell wall 122, and the third cell wall 123 are regularly formed at regular intervals, respectively, and the cell structure 100 is the first cell wall 121. The second cell wall 122 and the third cell wall 123 include a plurality of intersections 114, which are intersection points.

In addition, it is preferable that a plurality of holes (not shown) are formed in the cell wall 110 so that fluids between different cells can communicate with each other.

6 to 7, the structure of the inner wall 20 and the outer wall 30 of the tank body 50 of the present invention will be described in detail.

The tank body 50 is characterized by having a dual structure consisting of the inner wall 20 and the outer wall (30).

More specifically, the cell structure 100 includes an inner wall 20 in contact with the outer wall 30 positioned at a predetermined distance from the inner wall 20.

In addition, the inner wall 20 and the outer wall 30 is preferably made of a material having a pressure resistance and heat resistance.

In addition, a plurality of plate girders 40 are positioned between the inner wall 20 and the outer wall 30, and the girder 40 corresponds to a portion where the cell structure 100 contacts the inner wall 20. In contact with the outside of the inner wall 20, the other side is in contact with the inside of the outer wall (30).

When the tank body 50 having a large capacity is designed, the distance between the inner wall 20 and the outer wall 30 is wide, so that a person enters between the inner wall 20 and the outer wall 30 and the girder 40. One side of the welder may be formed by welding the outer side of the inner wall 20 and the other side of the outer wall 30. For this purpose, butt welding or fillet welding may be used.

The tank body 50 having a small capacity has a plurality of girders 40 having a 'ㅗ' shape in cross section between the inner wall 20 and the outer wall 30, and the upper surface of the girder 40 is the cell structure. The outer wall 30 is welded to the flange 41 of the girder 40 to be coupled to the outer side of the inner wall 20 corresponding to a portion where the inner wall 20 contacts the inner wall 20. .

That is, since the tank body 50 having a small capacity has a narrow distance between the inner wall 20 and the outer wall 30, a person cannot enter and work between the inner wall 20 and the outer wall 30. The outer wall 30 is welded by welding an upper portion of the girder to the outside of the inner wall 20 and then welding the outer wall 30 to the flange 41 outside the outer wall 30 to the flange 41. Can be formed. For this purpose, butt welding or fillet welding may be used.

In addition, when the reinforcing member 21 is installed on the inner wall 20 or the outer wall 30, the reinforcing member 21 is located on the inner side or the outer side of the inner wall 20 of the cell wall 120 It is preferable to be located in the form of a grid between them.

At this time, the reinforcing member 21 is preferably made of a strong bending strength in the cross-section 'ㅗ' shape.

In addition, one or more gas detectors (not shown) may be disposed between the inner wall 20 and the outer wall 30 to immediately detect when a crack occurs in the inner wall 20 so that fluid is leaked. It is preferable to process.

In addition, by forming a heat insulation layer on the outer side of the outer wall 30 to prevent the internal heat of the pressure tank 10 to go out.

In addition, one of the inner wall 20 and the outer wall 30 of the wall surface or a combination of a plurality of wall surfaces can be manufactured in advance and dried.

In addition, by filling the concrete or heat insulating composite material between the inner wall 20 and the outer wall 30, it is characterized in that the structural reinforcement and increase the heat insulating performance.

At this time, the thermal insulation composite material may be made of FRP (glass fiber reinforced plastic), a polymer compound and the like.

In addition, since the cell structure 100 is formed in a repeated structure, two or more pieces may be prepared in advance to be dried and then combined with each other in a dry place to complete one completed beam structure 100.

Accordingly, the grid beam pressure tank 10 of the present invention is to provide a new type of high pressure cold tank having a rectangular parallelepiped shape, that is, the size can be extended to any dimension of the pressure tank 10 and the pressure and temperature of the fluid Can withstand change

In addition, a tank having a high volumetric efficiency, that is, the volume of the tank body 50 may be manufactured in a rectangular parallelepiped shape so that the surrounding space may be efficiently used.

In addition, a double wall structure is provided, and a gas detector is provided between the outer wall 30 and the inner wall 20 to prevent the fluid from leaking.

In addition, by installing the cell structure 100 in the form of a lattice in the tank body 50, it is possible to reduce the sloshing phenomenon due to the fluid, on the outer wall 20 and the inner wall 30 of the tank body 50 Disperses the applied force.

10: pressure tank 20: inner wall
21: reinforcing member 30: outer wall
40: girder 41: flange
50 tank body
100: cell structure 110: unit grid
120: cell wall
121: first cell wall 122: second cell wall
123: third cell wall

Claims (13)

A high pressure fluid is accommodated therein, the tank body 50 is made of a square; Wow
Located inside the tank body 50, it is made in the form of a lattice, the cell wall 110 of the flat plate that is regularly orthogonally arranged to reach the other side wall facing from the one side wall of the tank body 50 to cross the shape Pressure tank having a surface lattice structure comprising a; cell structure 100 to withstand the pressure load produced.
The method of claim 1,
Pressure tank having a surface grating structure, characterized in that a plurality of holes (not shown) are formed in the cell wall 110 to allow fluid to move freely between cells.
The method of claim 2,
The tank body 50 includes an inner wall 20 to which the cell structure 100 contacts and an outer wall 30 positioned at a predetermined distance from the inner wall, wherein the inner wall 20 and the outer wall 30 are Pressure tank having a lattice beam structure, characterized in that made of a material having pressure resistance and heat resistance.
The method of claim 3, wherein
A lattice-shaped reinforcing member 21 is formed on at least one of an inner side surface of the inner wall 20, an outer side surface of the inner wall 20, an inner side surface of the outer wall 30, and an outer side surface of the outer wall 30. Pressure tank having a face grating structure, characterized in that located.
The method of claim 4, wherein
The reinforcing member 21 is a pressure tank having a surface grating structure, characterized in that the cross section is made of 'ㅗ' shape, the upper surface is bonded to the inner wall (20) or the outer wall (30).
The method of claim 4, wherein
A plurality of girders 40 having a plate shape are positioned between the inner wall 20 and the outer wall 30, and the girders 40 correspond to a portion where the cell structure 100 contacts the inner wall 20. A pressure tank having a surface lattice structure in contact with the outer side of the inner wall (20), the other side is in contact with the inner side of the outer wall (30).
The method of claim 4, wherein
Between the inner wall 20 and the outer wall 30, a plurality of girders 40 having a cross-section 'ㅗ' shape is located, the upper surface of the girder 40 is the cell structure 100 is the inner wall 20 In contact with the outside of the inner wall 20 corresponding to the portion in contact with, the plurality of the outer wall 30 is welded to the flange 41 of the girder 40 has a grating beam structure, characterized in that Pressure tank.
8. The method according to claim 6 or 7,
The girder (40) is a pressure tank having a surface grating structure, characterized in that the cell wall (110) intersects, the outer wall of the inner wall (20) corresponding to the portion in contact with the inner wall (20).
The method of claim 4, wherein
Pressure tank having a surface grating structure, characterized in that the gas detector is installed between the inner wall and the outer wall 30 to detect the gas.
The method of claim 4,
Pressure tank having a surface lattice structure, characterized in that the heat insulating layer is formed on the outer side of the outer wall (30).
The method of claim 4, wherein
The pressure tank is a pressure tank having a surface lattice structure, characterized in that it can be dried in advance to produce a structure that combines one wall surface or a plurality of wall surfaces of the inner wall (20) and the outer wall (30).
The method of claim 4, wherein
A pressure tank having a surface lattice structure, characterized by filling the concrete or insulating composite material between the inner wall 20 and the outer wall 30 to structurally reinforce and increase insulation performance.
The method of claim 4, wherein
The cell structure 100 is a pressure tank having a surface lattice structure, characterized in that can be combined in a dry place in advance by using two or more pieces, using the characteristics of the repeated structure.

Images