NL8003778A - METHOD FOR SEALING THE CONVERTED CONDITIONING OF REINFORCED CONTAINER IN CONCRETE OR PREMISED CONCRETE AND A CONTAINER CONTAINED BY THIS METHOD. - Google Patents

Description

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IT.Ο. 29185 7 *: Approval for sealing the inner wall of a double-walled container, consisting of reinforced or prestressed concrete, and a container sealed according to this method. The invention relates to a method for sealing the reinforced or prestressed concrete existing inner wall of a double-walled container for storing and transporting liquids and / or gases, mainly liquid gases, and a container sealed according to this method, wherein a heat-inhibiting layer is present between the two container walls.

When storing and transporting a liquid gas, it is known to use double-walled containers in order to prevent the cold liquid from escaping to the environment when the inner wall, which is the actual container, becomes leaky. In addition, the development trend from a mixed EPB with a steel inner reservoir and an outer shell made of prestressed concrete to a double-walled container 20 of prestressed bites, which increasingly seems to be the ideal construction form for the construction of liquid gas containers. Prestressed concrete is not subject to corrosion, requires no maintenance and does not require preservative work. The material is insensitive and robust, has no joints and absorbs the pressure of natural gas and liquefied gas with minimal deformation.

With its massive outer wall and a concrete top dome, it offers a high degree of security.

For example, a double-walled container is known in which the inner reservoir and the outer reservoir consist of prestressed concrete and the heat-inhibiting layer is arranged between the two reservoirs, for example in the form of loosely poured perlit granules. While the construction of the outer reservoir, which is protected from the heat by the heat-inhibiting layer, presents no problems, that of the inner reservoir is problematic precisely because this reservoir assumes the low temperature of the liquid gas.

/ In addition, the inner reservoir must be closed with respect to gas and liquid.

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However, as a building material with capillaries and open porous spaces, concrete is not immediately liquid-tight. Liquid gas containers therefore require an additional seal, which in known containers of this type consists of a tin coating, the so-called "liner". The application and maintenance of this "liner" is difficult, because its density is very high. large temperature differences must be guaranteed.

The object of the invention is now to provide an option to be able to omit such a coating ("liner") and to ensure the sealing of the concrete wall in another way.

According to the invention, this method is fulfilled in a method of the type mentioned in the preamble, in that the pore spaces of the bites of the inner wall shell are filled at least over a part of its thickness 7 / orders with a medium which in the operating state of the holder is fixed.

In addition, the medium can be brought either in a liquid or also in a gaseous state before penetrating into the pore spaces, after which it can optionally transition into a solid state via the liquid state.

Preferably, water or water vapor is used as the medium, which is cooled before the transition to the next state of acid. Alcohol, in particular a high-quality alcohol, can be mixed in the water.

The basic idea of the invention is to improve the lack of density of concrete caused by the 50 capillaries and the open pore spaces by filling the pore spaces with a medium which solidifies at the operating temperature of the container.

This has particular advantages in the storage of liquid gas, for example, the LNG, at temperatures of about -162 ° C, whereby, for example, water which is liquid at ambient temperature is frozen.

In order to fill the pore spaces of the concrete with the medium at least over a part of the thickness of the inner wall shell of a double-walled container, this must be done in liquid gaseous aggregate state 18003778

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get the opportunity to penetrate into the pore spaces. This can happen either because the medium is introduced into the wall shell in a liquid state or because the wall shell is exposed from the inside to water vapor, which condenses therein after penetration of the wall shell, which can be achieved or avoided. promoted by cooling.

Another object of the invention is to provide a double-walled container of the type mentioned in the preamble, wherein the pore spaces of the concrete of the inner wall shell are filled at least over a part of its thickness with a medium which is solid in the operating condition.

In addition, devices can be present in the inner wall shell for cooling the wall shell. Preferably, coolant pipes are embedded in the wall shell,

However, hollow spaces with porous walls for the liquid medium can also be arranged in the inner wall shell, which hollow spaces can form a pipe system.

Cavities are preferably formed between two plates of porous material spaced apart by spacers, eg asbestos cement. The spacers themselves can be formed by parallel ribs of the same material as the plates.

The invention is explained in more detail below with reference to illustrative embodiments shown in the figures.

Figure 1 shows a longitudinal cut through a holder according to the invention.

Figure 2 shows a section from a longitudinal section through the container wall on another scale.

Figure 3 shows a similar view to Figure 2 in another exemplary embodiment.

In figure 1 a longitudinal section is shown through a cylindrical container, which consists of an outer 1 and an inner wall 2 of reinforced or prestressed concrete.

An inhibiting layer 3 is provided on the inside of the outer wall 1. The space between the two walls is filled with heat-inhibiting material 4, eg Perlit, 8003778 4

The container is covered with a top cover 5 and placed on a bottom plate 6, which is designed in a manner similar to the side walls. The container can of course also have a different shape, for instance designed as a rotating body with a curved generating element.

In the exemplary embodiment shown in cross-section and on another scale in Fig. 2, the outer shell is provided with reinforcement in a manner known per se.

The inner wall is divided into two parts, an inner wall shell 2 'and an outer wall shell 2M, between which a liquid filling is arranged. In order to provide a cavity suitable for the liquid filling, from which the liquid can also penetrate into the pore spaces of the adjacent wall shells 2 'and 2 ”, between the two wall shells 2' and 2", asbestos cement slabs 6 and 7 are which are spaced apart by rib-shaped spacers 8. This creates channel-shaped hollow spaces between the spacers 8, which can be filled with a liquid 9.

The liquid for filling these voids must have the lowest possible viscosity so that it can easily penetrate into the capillaries and the pore spaces of the bites. This liquid should freeze when filling the container, e.g. with liquid gas. The freezing process must take place over as large a temperature range as possible. Although pure water can be used for this, it is less suitable, for example, as an alcohol-water mixture, especially when mixed with higher alcohols. These have the advantage that they expand less as water during freezing and that the freezing process itself proceeds over a relatively large temperature range. Thus, in spite of a small increase in volume during freezing, no appreciable additional pressure is exerted on the construction of such mixtures.

A further possibility of filling the capillaries and pore spaces with a medium which solidifies in the operating state of the container is illustrated in Figure 3.

This embodiment is based on the idea of placing the dew point for a limited time in the inner wall 2 4-0 of the container, until all pore spaces 8003778 * · 5 are filled there with the initially vaporous water. Such a condition can be achieved by embedding a cooling system from cold stores 11 in the wall shell 2, in which a cooling liquid circulates, which makes it possible to keep the wall at a predetermined low temperature. By injecting water vapor into the inner space of the container, the necessary amounts of moisture are made available which subsequently condense in the concrete of the wall shell 2 and, in this way, lead to a partial or total wetting of the wall shell.

When the wall bowl 2- is then cooled to the freezing point of water, this pore water remains in the form of ice. Since at the bearing temperature of the liquid gas between -100 and -19β ° 0, the solubility of water in the liquid gas is zero and, moreover, the vapor pressure is different, there is no danger of the ice disappearing from the pores.

The possibility associated with this solution to cool the inner wall shell 2 of the container in a controlled manner, has the further advantage that the tensile stresses which occur at the first filling with liquid gas 10 can be kept small due to temperature differences.

it's £ 8003778

Claims (10)

1.7 / method of sealing the inner wall of reinforced or prestressed concrete of a double-walled container for storage or transport of cold liquids and / or gases, in particular liquefied gas, characterized in that the pore spaces of the concrete of the inner wall shell should already be filled at least for part of its thickness with a medium which is solid in the operating condition of the container. 2. The method according to claim 1, characterized in that the medium is brought into a liquid state to penetrate into the pore spaces and then turns into the solid state. 3. A method according to claim 1, characterized in that the medium is brought into a gaseous state to penetrate into the pore spaces, and then optionally changes into the solid state via the liquid state. 4.7 / method according to any one of claims 1 to 3, characterized in that as medium water, resp. water vapor is used which is cooled before the transition to the next aggregate state. 5. Process according to claim 4, characterized in that the medium is mixed with water alcohol, in particular a higher-grade alcohol. 6. Double-walled container of reinforced or prestressed concrete, in particular for cold liquids or gases, eg liquid gas, in which a heat-inhibiting layer is arranged between the two container walls, characterized in that the pore spaces of the concrete of the inner wall shell be filled at least over a part of its thickness with a medium which is solid in operating condition. 7. Holder according to claim 6, characterized in that "lif *", 1 "V 35, characterized in that devices are arranged in the inner wall shell for cooling. 8. Container according to claim y, characterized in that coolant pipes are embedded in the wall shell 8003778. Container according to claim 6, characterized in that hollow spaces with porous walls for the liquid medium are arranged in the inner wall strip. 10. Holder as claimed in claim 9, characterized in that the hollow spaces form a pipe system. Container according to claim 9 or 10, characterized in that the cavities between two plates 10 spaced apart by spacers are formed from porous material, e.g. asbestos cement. Holder according to claim 11, characterized in that the spacers are formed by parallel ribs of the same material as the plates. k 4 8003778