JPH10101183A - Liquid storage equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain liquid storage equipment in a low construction cost, by holding liquid for adjustment in a shell body and submerging a bag-form tank having a strength against the liquid pressure acting from both inside and outside thereof. SOLUTION: A bag-form tank 4 made of a flexible material is submerged in the liquid 7 for adjustment held in a crust body 3 to shield and retain the storage liquid 16 in the bag-form tank by means of a membrane 14, in liquid storage equipment 1. And hence, what is necessary is that the membrane 14 has a strength withstanding the pressure difference between both inside and outside liquid. In the case when the storage liquid 16 is a Oninoco tar-emulsion and the liquid 7 for adjustmnet is seawater, for instance, both specific gravities are almost equal to each other and hence, the liquid pressure acting from the inside is equal to the liquid pressure acting from the outside, at the membrane 14 of the bag-form tank 4. Accordingly, extremely costless equipment having a large storage capacity can be erected in comparison with conventional steel structure tanks.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid storage facility for storing a liquid.

[0002]

2. Description of the Related Art As is well known, when storing a liquid,
A tank is used. The structure of the tank differs depending on the type of liquid stored in the tank. In particular, tanks for storing dangerous substances such as oils have detailed specifications and standards for the structure and strength.

A facility for storing liquids on a large scale includes, for example, a ground-type heavy oil tank. When it is necessary to store liquids treated as non-dangerous substances such as orinoco tar emulsion on a large scale. Above all, it was common to remodel a part of such a ready-made heavy oil tank for storage.

[0004]

However, when storing non-hazardous liquids such as orinocotal emulsion, a strict structure such as a conventional heavy oil tank is not required. It is thought that even if a storage facility is constructed, it can be constructed relatively inexpensively. In particular, orinoco tar has been spotlighted as one of the alternative energy sources to petroleum due to its huge proven reserves, low cost, and low pollution, and it is also used for thermal power generation. As a result, storage needs have arisen. From the above, for such a liquid,
There was a need to develop a dedicated storage facility that could be constructed at low cost.

In view of the above circumstances, the present invention aims to provide a liquid storage facility that can be constructed at a lower cost than conventional oil storage structures and is particularly suitable for storing orinocotal emulsions. Aim.

[0006]

The present invention employs the following means in order to solve the above-mentioned problems. That is,
The liquid storage facility according to claim 1, wherein the outer shell body stores the adjustment liquid therein, and a bag-shaped flexible material disposed in the outer shell body by being immersed in the adjustment liquid. Tank and
It is characterized by comprising a supply / discharge facility for supplying / discharging the stored liquid to / from the inside of the bag-shaped tank, and adjusting means for adjusting a water level of the adjusting liquid in the outer shell.

[0007] In this liquid storage facility, by immersing the bag-shaped tank in the adjusting liquid stored in the outer shell, when the specific gravity of the adjusting liquid and the specific gravity of the stored liquid are approximately the same, The liquid level of the adjustment liquid and the stored liquid are almost the same, so that the water level inside the bag-shaped tank can be adjusted by adjusting the water level of the adjustment liquid, and no stress is generated in the bag-shaped tank. Becomes

[0008] The liquid storage facility according to the second aspect is the first aspect.
In the liquid storage facility described above, the adjusting means is a facility for supplying and discharging water from the water to the outer shell body from the water as an adjusting liquid. In this liquid storage facility, for example, it is possible to supply and discharge seawater into and from the outer shell, so that a facility suitable for storing an orinocotal emulsion having a specific gravity substantially equal to that of seawater can be realized. .

The liquid storage facility according to the third aspect is the first aspect of the invention.
Or the liquid storage facility according to 2, wherein the supply / discharge facility is provided in the bag-shaped tank in a vertical direction, and has a pipe for supplying / discharging the stored liquid to / from the bag-shaped tank, The pipe is supported on the bottom surface of the outer shell through a membrane of the bag-shaped tank.
In this liquid storage facility, since the pipe is supported on the bottom of the outer shell, even when the specific gravity of the adjusting liquid and the specific gravity of the stored liquid are different, the bag-like tank rises and sinks, and becomes unstable. Nothing.

A liquid storage facility according to a fourth aspect of the present invention is the liquid storage facility according to any one of the first to third aspects, wherein the outer shell is formed in the excavated ground. Features. In this liquid storage facility, since the outer shell is formed by excavation in the ground, the facility itself can be used as an underground structure.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing an embodiment of the present invention, and reference numeral 1 indicates a liquid storage facility in the present embodiment. The liquid storage facility 1 is provided with an outer shell 3 constructed by excavating the ground 2 and a bag-shaped tank 4.

The bottom surface 5 and the side surfaces 6 of the outer shell 3 are made of concrete walls, and an adjusting liquid 7 made of water is stored in the inside thereof. Further, the outer shell 3 is provided with adjusting means 8 for adjusting the water level of the adjusting liquid 7. The adjusting means 8 includes an adjusting pump 9 and an adjusting pipe 11 installed from the adjusting pump 9 toward the inside of the outer shell 3 and the external water area 10. Note that the external water area 10 is specifically the sea, and therefore the adjusting means 8
Is configured so that water can be pumped from the external water area 10 to the inside of the outer shell 3 as the adjusting liquid 7, and the water is supplied to and discharged from the external water area 10 as indicated by an arrow. Thus, the water level of the adjustment liquid 7 can be adjusted. Here, the water level of the adjusting liquid 7 is kept the same as the water level in the external water area 10 and the groundwater level 12 in the ground 2.

On the other hand, the bag-shaped tank 4 has a rigid structure 13
For example, a membrane portion 14 made of a flexible material made of a rubber sheet and a pipe 15 having a plurality of holes on a side surface.
It is provided with. As shown in FIG.
It is processed into a bag-like shape and is adhered to the outer periphery of the lower end of the rigid structure portion 13, and a storage liquid 16 composed of an orinocotal emulsion is stored therein. The rigid structure 13 includes a pipe 15 and an air release pipe 17.
Is inserted, and the bottom is formed as a metallic lid 18 for holding the stored liquid 16. The pipe 15 is arranged vertically as shown in the figure, and a pipe support board 19 is provided at the tip thereof. The pipe support board 19 is supported by the bottom surface 5 of the outer shell 3 via the membrane portion 14, and is configured such that the bag-like tank 4 can be self-supported by the pipe 15. Further, as shown in the figure, the pipe 15 is connected to a supply / discharge facility 20, and is configured to supply / discharge the stored liquid 16. The supply / discharge facility 20 is provided with a supply pipe 21 connected to the pipe 15 to supply the stored liquid 16 to the bag-shaped tank 4, and a pump 22. The pump 22 supplies liquid such as an oil tanker. It is connected to a source and a liquid supply destination such as a burner.

The above is the main configuration of the present embodiment. Next, the operation of the liquid storage facility 1 of the present embodiment will be described. The stored liquid 16 is supplied from a supply source such as an oil tanker, and includes a pump 22 and a supply pipe 21.
Is supplied to the inside of the bag-shaped tank 4. At this time,
The liquid level of the stored liquid 16 is adjusted between the adjusting liquid 7 and the stored liquid 1.
In the case where the specific gravity of the adjustment liquid 6 is the same as that of the adjustment liquid 7, it always matches the liquid level of the adjustment liquid 7 regardless of the amount of the stored liquid 16.

For example, when the storage liquid 16 is an orinocotal emulsion and the adjusting liquid 7 is seawater, the specific gravities of the two are almost the same.
In, the hydraulic pressure acting from the inside and the hydraulic pressure acting from the outside are the same. When the stored liquid 16 is further supplied into the bag-shaped tank 4, the water level of the stored liquid 16 rises instantaneously, but the difference in water level generated at this time causes a difference in the hydraulic pressure acting inside and outside the membrane portion 14. Is caused, and the film portion 14 moves toward the outside of the bag-shaped tank 4 due to the pressure difference.

When the position of the membrane portion 14 moves outward, the cross-sectional area of the bag-shaped tank 4 increases, so that the water level of the stored liquid 16 decreases and finally reaches the same position as the adjusting liquid 7. . The liquid level of the stored liquid 16 is the adjusting liquid 7
When it becomes the same as above, there is no longer any difference in hydraulic pressure between the inside and outside of the membrane part 14, so that the movement of the position of the membrane part 14 is stopped.

As described above, once the water level of the stored liquid 16 becomes the same as that of the adjusting liquid 7, the stored liquid 16
Is supplied into the bag-shaped tank 4, only the cross-sectional area of the bag-shaped tank 4 changes according to the storage amount of the stored liquid 16, and therefore, the water level of the adjusting liquid 7 is kept constant by the adjusting means 8. If stored, the stored liquid 1 in the bag-shaped tank 4
The water level of 6 will also always be kept constant. Also,
Conversely, by changing the water level of the adjusting liquid 7, the water level of the stored liquid 16 can be adjusted.

When the stored liquid 16 stored in the bag-shaped tank 4 is to be taken out, the pump 22 is operated to send the stored liquid 16 to a supply destination such as a burner. In this case,
The cross-sectional area of the membrane part 14 is reduced, and the water level of the stored liquid 16 is kept the same as the water level of the adjusting liquid 7.

As described above, the liquid storage facility 1 according to the present embodiment is configured such that the membrane portion 14 of the bag-shaped tank 4 made of a flexible material is used for adjusting the membrane portion 14 stored in the outer shell 3. By immersing in the liquid 7, the stored liquid 16 inside is shielded and stored by the membrane portion 14,
It is only necessary that the film portion 14 has a strength that can withstand the difference between the internal and external hydraulic pressures. Therefore, it is possible to construct a facility capable of exhibiting a large-capacity storage function at a much lower cost than a rigid tank such as a heavy oil tank which has conventionally been used for storing an orinoco tar emulsion.

In particular, when the orinocotal emulsion is to be stored using the liquid storage facility 1, it is preferable to use seawater as the adjusting liquid 7, taking advantage of its characteristic that the specific gravity is substantially the same as that of seawater. It is. By doing so, it is possible to make the liquid levels of the adjustment liquid 7 and the stored liquid 16 substantially the same, and therefore,
No stress is applied to 4 and the stored liquid 16 can be stored in a safe state. As described above, the present embodiment makes it possible to realize a liquid storage facility 1 suitable for storing an orinoco tar emulsion.

Further, in the liquid storage facility 1 of the present embodiment, the inside of the outer shell 3 is adjusted by connecting the outer water body 10 as the sea and the inside of the outer shell 3 by the adjusting means 8. The water level of the adjustment liquid 7 can be adjusted. Therefore, the water level of the adjustment liquid 7 is adjusted to the sea level or the surrounding ground 2.
By keeping the water level constant in accordance with the groundwater level 12, the water level of the stored liquid 16 can be adjusted to a constant level by the above-described operation.

The features of this embodiment are as follows.
This is particularly suitable when an orinocotal emulsion is to be stored as the storage liquid 16. Orinocotal emulsions tend to become large and deteriorate when subjected to shearing force, so a pump that does not easily apply shearing force to the transport liquid, such as a screw pump, is used for transport. However, this type of pump has a drawback that the suction force is weak. However, in the present embodiment, the liquid level can always be kept at a desired position regardless of the storage capacity of the stored liquid 16 in the bag-shaped tank 4, and the underground storage type as in this embodiment Even when is adopted, since the liquid level can always be located near the ground, the pump can be arranged on the ground. As described above, the present embodiment simplifies the configuration relating to the pump as compared with the related art, and
The supply / discharge facility 20 can be configured at low cost.

Further, the liquid storage facility 1 of the present embodiment
Because it is an underground structure built in the ground 2, it is possible to effectively use the above-ground part, and if this above-ground part is green, it is also preferable from the viewpoint of landscape, and the green area that is legally required It is also possible to incorporate. As described above, in the present embodiment, it is possible to effectively use the site area.

Further, even in the case where the bag-like tank 4 is damaged for some unexpected reason and the stored liquid 16 leaks, the outer shell 3 and the surrounding ground 2 itself can be used as a barrier. By the stored liquid 1
Measures can be taken while preventing leakage to the surroundings of the facility 6, thus improving the safety and reliability of the facility.

Further, the bag-like tank 4
Can easily be lifted to the ground, and the inspection work can be simplified. In some cases, it is possible to perform an airtight test while the bag-shaped tank 4 is left in the adjustment liquid 7 as it is.
Inspection work can be further simplified and made more efficient.

Further, in this embodiment, the temperature change is smaller than on the ground throughout the year, and the temperature control is simple. Furthermore, since the stored liquid 16 is stored inside the outer shell 3 provided as an excavation space in the ground 2, the earth pressure acting on the side surface 6 of the outer shell 3 is only about the effective earth pressure. It does not work, so that the structure of the side surface 6 can be simplified as compared with a general retaining wall, and its construction cost can be reduced.

Although an embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment, but can be used for storing any liquid. The structure, form, and other changes can be made in response to the above.

For example, in the above-described embodiment, an example is shown in which the specific gravities of the adjusting liquid 7 and the stored liquid 16 are substantially equal, but these specific gravities may be different. As such an example, FIG. 2 shows an example in which the specific gravity of the stored liquid 16 is larger than the specific gravity of the adjusting liquid 7.
This case corresponds to a case where the stored liquid 16 is an orinoco tar emulsion and fresh water is used as the adjustment liquid 7. If the specific gravity of the stored liquid 16 is ρ ₁ , the liquid depth is h ₁ , the specific gravity of the adjusting liquid 7 is ρ ₂ , and the liquid depth is h ₂ , the bag-shaped tank 4
Hydraulic P ₁ acting from the inside at the bottom,

(Equation 1) And the hydraulic pressure P ₂ acting from the outside is

(Equation 2) Becomes

When the stored liquid 16 is supplied into the bag-shaped tank 4, the stored liquid 16 initially stays from the bottom of the membrane portion 14.

(Equation 3) , That is, h ₁

(Equation 4) After that, since P ₁ exceeds P ₂ , the film part 14 swells to the limit, and tensile stress gradually acts from the bottom.

FIG. 3 is a graph showing the hydraulic pressure acting on the inside and outside of the bag-shaped tank 4 at this time. In FIG. 3, the vertical axis indicates the height h from the bottom surface 5 at each position of the bag-shaped tank 4, and the horizontal axis indicates the hydraulic pressure acting from inside and outside at each position of the bag-shaped tank 4. P
It shows. In the figure, the one-dot chain line indicates the hydraulic pressure P _i applied to the inside of the bag-shaped tank 4 by the stored liquid 16, and the solid line indicates the hydraulic pressure P _i by the adjusting liquid 7 outside the bag-shaped tank 4. Applied hydraulic pressure _Po
It is.

As shown in FIG. 3, at the upper part of the film part 14, P _o exceeds P _i , so that the film part 14
2 contracts as shown in FIG. In the lower part of the membrane portion 14, P _o is below than P _i, the lower portion of the film unit 14 as shown in FIG. 2 Correspondingly will be expanded, also, P _o
And P _i are balanced by the tensile stress generated in the film portion 14.

Further, with respect to the tensile stress generated in this case, the material of the film portion 14 is appropriately selected, and
4 by incorporating a reinforcing material,
It is good to give proof stress.

FIG. 4 shows an example in which the specific gravity ρ ₁ of the stored liquid 16 is smaller than the specific gravity ρ ₂ of the adjusting liquid 7. Also in this case, similarly to FIG. 3, the hydraulic pressure acting on the inside and outside of the bag-shaped tank 4 is shown as a graph in FIG. The vertical axis and the horizontal axis in the graph of FIG. 5 are the same as those in FIG. 3, and the height h from the bottom surface 5 at each position of the bag-like tank 4 and the height h at each position of the bag-like tank 4 are respectively shown. Hydraulic pressure P acting from inside and outside
Is represented. Further, in the figure, similarly to FIG. 3 shows a hydraulic P _i applied to the inside of the baggy tank 4 by a chain line, the solid line indicates the hydraulic pressure P _o applied to the outside of the baggy tank 4 It is. Membrane part 14 in bag-shaped tank 4
In the lower part of, for P _o is above the P _i as shown in FIG. 5, is deposited on the film unit 14 pipe 15 shrinks, as shown in FIG. 4, the upper portion of the film portion 14 and the in rigid structure 13, since the P _o is below the P _i as shown in FIG. 5, the film unit 14 as shown in FIG. 5 it is expanding.

In this case, assuming that the liquid depths from the liquid surface of the stored liquid 16 and the adjusting liquid 7 to the lowermost end of the expanded portion of the film portion 14 are h ₃ and h ₄ , respectively, as shown in FIG. At the lowermost end of the portion where the portion 14 has expanded, as shown in FIG.

(Equation 5) Therefore, the difference Δh between the liquid levels of the stored liquid 16 and the adjustment liquid 7 is

(Equation 6) From equation (5),

(Equation 7) Can be expressed as

Also in this case, the above-mentioned ρ ₁ > ρ ₂
As in the case of (1), since tensile stress acts on the film portion 14, the material of the film portion 14 is appropriately selected, and by incorporating a reinforcing material into the film portion 14, the film portion 1 is formed.
It is good to give proof stress to No.4.

In the above, an example in which the specific gravity of the stored liquid and the specific gravity of the adjusting liquid are different has been described. However, the present invention can also change the material to be used, change the structure or the installation location, and the like. For example, in the above embodiment, the film portion 14 is made of a rubber sheet. However, instead of this, the film portion 14 may be made of synthetic resin or fiber.

Further, in the above embodiment, the bottom surface 5 and the side surfaces 6 of the outer shell 3 are concrete walls, but they may be constituted by sheet piles. In addition, since these may be simply configured to be able to store the adjusting liquid 7, they do not necessarily have to have a water stopping structure. Therefore, the adjusting liquid 7
When the liquid depth is relatively shallow, a slope structure may be employed, in which case the construction cost can be reduced. Further, it is conceivable to construct the outer shell 3 with a caisson.

The installation location of the liquid storage facility 1 does not need to be in the ground, but a wall is constructed in the sea or lake water by a sheet pile or other construction method to form an outer shell 3, in which a bag-like tank is placed. 4 may be built. In this case, the configuration of the adjusting unit 8 can be simplified.

Further, in the above embodiment, the external water area 10 is assumed to be the sea, but may be a lake or a pond. In that case, fresh water is used as the adjusting liquid. You may make it. In addition, outside water area 10
It is not necessary to secure the adjustment liquid 7 by using the cooling water as a supply source. For example, in winter, cooling water of a power plant may be used as the adjustment liquid 7, and equipment costs such as heaters can be reduced. .

[0040]

As described above, according to the liquid storage facility of the first aspect, since the adjusting liquid is stored inside the outer shell and the bag-shaped tank is immersed therein, The tank may be configured to withstand liquid pressure acting on the inside and outside thereof, so that liquid storage facilities can be realized at lower construction costs than conventional rigid tanks and the like. In addition, in this liquid storage facility, in particular, when the specific gravity of the adjustment liquid stored in the outer shell and the stored liquid in the bag-shaped tank are the same, there is no liquid pressure difference between the inside and outside of the bag-shaped tank, Therefore, the safety of the bag-shaped tank is maintained. In this way, by using a liquid having the same specific gravity as the liquid to be stored as the adjusting liquid,
The safety and reliability of the facility can be improved.

In the liquid storage facility according to the second aspect,
It is possible to supply and discharge water from the water as an adjusting liquid to the inside of the outer shell by the adjusting means. When the stored liquid is an orinocotal emulsion, the seawater is supplied from the sea as the adjusting liquid. Thus, the specific gravity of the stored liquid and the specific gravity of the adjustment liquid become substantially the same, so that the invention according to claim 1 can be favorably realized. Thus, this liquid storage facility is particularly suitable for storing emulsions such as orinocotal emulsions.

According to the liquid storage facility of the third aspect, the pipe is provided as a supply / discharge facility for the bag-shaped tank, and the pipe is supported on the bottom surface of the outer shell, so that the bag-shaped tank itself is provided. Can be self-supporting inside the outer shell, and therefore, even when the specific gravity of the adjusting liquid and the stored liquid are different, the bag-shaped tank does not rise or sink, and it is possible to realize the stability of the facility. Become.

According to the liquid storage facility according to the fourth aspect, since the outer shell is formed by excavating the ground, the facility can be an underground structure, and the adjusting liquid is contained inside. Since it is stored, the earth pressure can be received by the water pressure of the adjusting liquid, and the structure can be simplified as compared with the conventional earth retaining wall. In addition, by making the facility an underground structure, it is possible to effectively use the above-ground portion, and it is possible to facilitate the temperature control of the facility by utilizing the fact that the temperature difference between seasons is small. .

[Brief description of the drawings]

FIG. 1 is a sectional view of a liquid storage facility schematically showing an embodiment of the present invention.

FIG. 2 is a sectional view of a liquid storage facility according to another embodiment of the present invention.

FIG. 3 is a graph showing the pressure acting on the bag-like tank from inside and outside thereof in the liquid storage facility shown in FIG.

FIG. 4 is a sectional view of a liquid storage facility showing another embodiment different from FIG. 2 of the present invention.

FIG. 5 is a graph showing the pressure acting on the bag-shaped tank from inside and outside thereof in the liquid storage facility shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Liquid storage facility 2 Ground 3 Outer shell 4 Bag-shaped tank 5 Bottom surface 7 Adjustment liquid 8 Adjusting means 9 Adjustment pump 10 External water area 14 Membrane part 15 Pipe 16 Stored liquid 20 Supply / discharge equipment

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Motoe Kanno 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Corporation (72) Inventor Haruo Fujishiro 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Construction Co., Ltd. (72) Inventor Akira Ogawa 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Corporation (72) Inventor Nobuhiro Tsuchiya 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Corporation

Claims (4)

[Claims] 1. An outer shell body in which an adjustment liquid is stored, a bag-shaped tank made of a flexible material and immersed in the adjustment liquid in the outer shell body, and the bag. A liquid storage facility comprising: a supply / discharge facility for supplying / discharging a stored liquid to / from the inside of a tank; and an adjusting means for adjusting a water level of the adjusting liquid in the outer shell. 2. The liquid storage facility according to claim 1, wherein
The liquid storage facility, wherein the adjusting means is a facility for supplying and discharging water as adjustment liquid from the water to the outer shell. 3. The liquid storage facility according to claim 1, wherein the supply / discharge facility is disposed vertically in the bag-shaped tank, and supplies and discharges the stored liquid to / from the bag-shaped tank. A liquid storage facility, comprising: a pipe that is formed on the bottom surface of the outer shell through a membrane portion of the bag-shaped tank. 4. The liquid storage facility according to claim 1, wherein the outer shell is formed in excavated ground. .