JPS6199798A - Ultralow temperature liquid accommodating tank - Google Patents

Abstract

PURPOSE:To obtain an ultralow temperature liquid accommodating tank free from the restriction for the construction ground by constituting the captioned tank from an outer tank constituted of double walls made of concrete and an inner tank made of metal which accommodates the ultralow temperature liquid and forming the outer tank into a construction which can be towed. CONSTITUTION:An outer tank 1 consists of a hollow box body which can be towed and made of prestressed concrete, etc. The outer tank has a double structure consisting of outer wall 11 and the inner walls 12, and an inner tank 2 is built into the inner wall 12. The gap between the inner wall 12 and the outer wall 11 serves as the flow passage 13 for the air supplied from a temperature adjusting apparatus 3. Said temperature adjusting apparatus 3 is installed onto the upper surface of the outer wall 11. The temperature adjusting apparatus 3 keeps the temperature of the supplied air always at 0 deg.C according to the signals of a plurality of sensors S installed onto the inner wall 12 of the outer tank 1.

Description

DETAILED DESCRIPTION OF THE INVENTION <I> Industrial Application Field The present invention relates to a tank for storing ultra-low temperature liquid such as LNG.

<fl> Conventional technology For example, in a tank that stores liquid at an ultra-low temperature of -100 degrees Celsius or less, not only the tank itself but also the ground around it may freeze, damaging the tank or creating a force that pushes the tank down. I do things.

Furthermore, when the outside temperature rises, the liquefied stored material accelerates evaporation, resulting in an unfavorable situation from a quality control perspective.

Furthermore, in places where the location conditions are suitable for constructing huge and complex structures such as ultra-low temperature liquid storage tanks,
It is strictly limited.

<l[>Problems to be Solved by the Present Invention The present invention has been developed in view of these points, and it does not have any negative effects due to low temperature on the outside or the tank itself, and also allows the ultra-low temperature liquid storage tank to be used in various facilities. To provide a cryogenic liquid storage tank that is not limited by the construction location by constructing a towable structure in a well-equipped port facility, towing it to the destination, landing on the bottom, and backfilling. The purpose is to

■〉Means for solving the problem The present invention has a double-structured towable outer tank made of prestressed concrete, and a metal inner tank that stores ultra-low temperature liquid built into the outer tank. Configure.

In addition, a cold insulation layer is installed between the inner tank and the outer tank.

Then, the space between the double g1 of the outer tank is used as an air flow path, and a temperature control device is installed to feed heated or cooled air into the flow path.

Furthermore, sensors communicating with the temperature control device were installed at several locations on the inner wall of the outer tank to keep the flow path at O''C at all times.

<V> Example Next, one embodiment of the present invention will be described based on the drawings.

The ultra-low temperature liquid storage tank used in the present invention has a double-structured structure in which an inner tank 2 is built into an outer tank 1 that can be towed.

(a) Outer tank The outer tank 1 is a towable hollow box made of prestressed concrete or the like.

It has a double structure with an outer wall 11 and an inner wall 12, and an inner tank 2, which will be described later, is built into the inner wall 12.

The gap between the inner wall 12 and the outer wall 11 serves as a flow path 13 for air from the temperature control device 3, which will be described later.

And there is warmth on the top of the outer wall 11! Set up l1ii13.

111@13 is a device that takes in air from the outside, heats or cools it, and sends it into the flow path 13.

Air from the temperature control device 3 is sent into the flow path 13 and circulated around the inner tank 2 .

The temperature control device 3 is configured to constantly maintain the temperature of the air being fed at 0° C. based on signals from sensors S installed at a plurality of locations on the inner wall 12 of the outer tank 1.

It is also conceivable that the air flowing around the bottom of the inner tank 2 be discharged to the outside without circulating the air in the flow path 13.

(b) Inner tank The inner tank 2 uses a conventional storage tank such as a membrane or semi-membrane type.

The size is such that it can be built into the hollow part of the inner wall 12 of the outer tank 1.

At this time, cold insulators 4 are installed in the outer tank 1 and the inner tank 2B.

It is also conceivable to divide the inside of the outer tank 1 into several spaces and incorporate the inner tank 12 into each space.

In this case, it is also conceivable to provide a flow path 13 for each block, and to install a temperature control device ai3 in each block in the outer tank 1.

Next, the operating state of the above cryogenic liquid storage tank will be explained.

Once construction is completed at the dock, etc., the vessel is towed to its destination, reaches the bottom, and
It will be backfilled and used as a semi-underground storage tank.

(a) Storage of ultra-low-temperature liquid Although the stored material in the inner tank 2 is an ultra-low-temperature liquid, the inner wall 12 and outer wall 11 of the outer tank 1 may be cooled and damaged.

So, the outer wall 11 of the outer tank 1, inside! ! A heated fluid is sent into the channel 13 so that the temperature of the fluid 12 is always maintained at 0°C.

The temperature control device 3 operates so that the flow path 13 is always kept at 0° C. by sensors S installed at multiple locations on the inner wall 12 of the outer tank 1.

(b) When the outside temperature becomes high If the outside temperature becomes roaring, there is a risk that the stored material will evaporate.

In this case, when the temperature inside the flow path 13 rises above 0°C,
Sensor S detects this and sends a signal to 1111i113.

The temperature control device 3 feeds cooled air into the flow path 13 and adjusts the temperature within the flow path 13 so that it does not rise above 0°C.

<Vl> Effects of the Invention Since the present invention has been described above, the following effects can be expected.

(b) The outer tank has a double structure consisting of an inner wall and an outer wall, with the inner wall functioning as a secondary barrier and the outer wall functioning as a breakwater, and further improving safety against gas and liquid leaks.

(b) Because it is a semi-underground structure, it is subject to external forces such as earth pressure, hydraulic pressure, and frozen soil pressure in cold regions, but by first absorbing the external force energy by deforming the outer wall, it is possible to deal with these forces directly by tank or secondary tank. Since no force is applied to the inner wall as a secondary breakwater, structural and functional safety is improved compared to conventional breakwaters.

(c) Adopting a double-hull structure for the bottom plate increases rigidity and reduces the possibility of uneven settlement, increasing structural safety.

Furthermore, if concrete, which is free from low-temperature brittleness, is used for the outer tank, it will have even higher structural reliability as a secondary barrier or liquid barrier.

(d) The channels in the inner and outer walls of the double structure can be used not only as channels but also as spaces for monitoring gas and liquid leaks.

(e) Temperature control IT was installed to constantly maintain the temperature in the flow path at 0° C. using signals from sensors installed at multiple locations within the flow path.

Therefore, when used as a storage tank, there is no risk that the stored material will be altered due to environmental temperature changes or that the ultra-low temperature liquid storage tank itself will be damaged.

Furthermore, by controlling the temperature to approximately 0°C, the boil-off gate can also be economically balanced within that range.

(f) The exterior walls are made of concrete, so they can be repaired.

(g) The inner tank for storing the ultra-low temperature liquid was built into the outer tank with a capacity of 11A nJ.

Therefore, there are no restrictions on the location of construction, as there would be if a huge and crude U4-shaped ultra-low temperature liquid storage tank were built on land.

That is, it can be constructed at a production site such as a dock with sufficient equipment, and then towed and installed at any predetermined destination.

Therefore, it is possible to provide high-precision, high-quality functions, and it can also be easily installed in cold regions where construction time is not sufficient.

[Brief explanation of drawings]

Figure 1: Perspective view of the ultra-low temperature liquid storage tank of the present invention Figure 2:
Cross-sectional description of the ultra-low temperature liquid storage tank of the present invention 1: Outer tank 2:
Inner tank 3: Temperature control device

Claims (1)

[Claims] Consisting of an outer tank with double walls made of concrete and an inner tank made of metal for storing ultra-low temperature liquid, the outer tank is formed into a towable structure, and the outer tank has two walls: An ultra-low temperature liquid storage tank configured to communicate between heavy walls as an air flow path and maintain the temperature within this flow path at zero degrees.