JP2004026170A - Holding method and device for tank - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a holding device for a tank for suppressing corrosion of the tank buried in the ground caused by underground water containing salt. <P>SOLUTION: A holding device H of a tank T comprises a hole part 1 to accommodate the tank T, a supporting part 2 to form a space between an inner surface of the hole part 1 and an outer surface of the tank T, and a water feeder 4 to feed fresh water in the formed space. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method and a device for holding a tank.
[0002]
[Prior art]
Effluent generated in a power plant, a factory, or the like is stored in a predetermined tank and then processed. Here, the tank for storing the drainage liquid is often buried in the ground.
[0003]
[Problems to be solved by the invention]
By the way, when a power plant, a factory, and the like are along the sea, the tank buried in the ground is exposed to groundwater (seawater) containing salt, and corrosion proceeds due to salt.
[0004]
The present invention has been made in view of such circumstances, and an object of the present invention is to provide a tank holding method and a tank holding device capable of suppressing corrosion of a tank buried in the ground due to groundwater or the like.
[0005]
[Means for Solving the Problems]
In order to solve the above problems, a method for holding a tank according to the present invention includes: installing a tank in a hole; and supplying water to a space between an inner surface of the hole and an outer surface of the tank installed in the hole. The water is interposed between the hole and the tank. Further, the tank holding device of the present invention is a tank holding device for holding a tank, the hole holding the tank, the inner surface of the hole and the outer surface of the tank installed in the hole. It is characterized by comprising a support portion for supporting the tank so as to form a space therebetween, and a water supply device for supplying water to the space.
[0006]
ADVANTAGE OF THE INVENTION According to this invention, when accommodating a tank in the hole part formed in the earth etc., it can suppress that a tank is exposed to groundwater by interposing water between a hole part and a tank. Therefore, corrosion of the tank can be suppressed. The hole is not limited to being formed on the ground.
[0007]
In the above-described method for holding a tank, a configuration is adopted in which the supplied water has a salt concentration set to a predetermined value or less. Further, in the tank holding device described above, the water supply device is configured to supply fresh water.
Thus, the groundwater containing salt is diluted with water (fresh water) whose salt concentration (impurity concentration) is set to a predetermined value or less, so that the progress of corrosion of the tank due to salt can be suppressed.
[0008]
In the above-described method for holding a tank, a configuration is employed in which at least one of a water supply operation and a water discharge operation to a space is performed at predetermined time intervals.
Thereby, the water in the space can be exchanged periodically, and the salt concentration (impurity concentration) of the water interposed between the hole and the tank can be suppressed, so that the corrosion of the tank can be suppressed.
[0009]
In the above-described method for holding a tank, a configuration is employed in which the operation of supplying and discharging the water to and from the space is performed continuously.
Thereby, the water in the space is constantly circulated, and the salt concentration (impurity concentration) of the water interposed between the hole and the tank can be suppressed, so that the corrosion of the tank can be suppressed.
[0010]
In the above-described method for holding a tank, a configuration is employed in which a salt concentration of water in the space is detected, and at least one of a water supply operation and a water discharge operation to the space is performed based on the detection result. Further, in the tank holding device described above, a control device that controls a supply operation of the water supply device, and a detection device that detects a salt concentration of water in the space, wherein the control device is configured to detect the detection device. The structure which controls the said water supply apparatus based on a result is employ | adopted.
Thereby, the salt concentration of water interposed between the hole and the tank can be constantly suppressed to a predetermined concentration or less.
[0011]
In the above-described method for holding a tank, a configuration is adopted in which the hole has a bottom and the water is supplied to a space between the bottom of the hole and the bottom of the tank. Further, in the tank holding device described above, the hole has a bottom, and the water supply device supplies the water to a space between the bottom of the hole and the bottom of the tank. And a configuration is adopted in which the supply pipe has a nozzle unit that sprays water toward the bottom of the hole.
Accordingly, water containing salt with a high specific gravity at the lower portion of the space, dust and the like at the bottom of the hole are stirred, and the dust and the like can be easily discharged together with the water in the space.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the tank holding device of the present invention will be described with reference to the drawings. 1 is a side sectional view showing an embodiment of the tank holding device of the present invention, FIG. 2 is a sectional view taken along the line AA of FIG. 1, and FIG. 3 is a sectional view taken along the line BB of FIG. It is.
In FIG. 1, a holding device H for holding a tank T is provided on a concrete base 100, a hole 1 capable of housing the tank T, provided inside the hole 1, and housed in the hole 1. A plurality of support portions 2 (2A, 2B) for supporting the tank T are provided. The base 100 is buried in the ground, and the hole 1 has a bottomed cylindrical shape with an open top, and has an inner peripheral surface 1a and a bottom 1b. The tank T is made of, for example, a metal such as stainless steel, and stores liquid discharged from a power plant or a factory.
[0013]
The support portion 2 includes a plurality of support portions 2A provided between an inner peripheral surface (inner surface) 1a of the hole portion 1 and an outer peripheral surface (outer surface) Ta of the tank T, a bottom portion (inner surface) 1b of the hole portion 1, and a tank. And a plurality of support portions 2B provided between the bottom portion (outer surface) Tb of the T. Each of the support portions 2A and 2B has a block shape. The support portions 2A are provided at two locations in the vertical direction, and are provided at equal intervals along the outer peripheral surface Ta of the tank T, as shown in FIG. The support 2A positions the tank T with respect to the hole 1 and forms a side space Sa between the outer peripheral surface Ta of the tank T and the inner peripheral surface 1a of the hole 1. The support 2B supports the bottom Tb of the tank T, and forms a bottom space Sb between the bottom Tb of the tank T and the bottom 1b of the hole 1. The side space Sa and the bottom space Sb communicate with each other, and in the following description, the side space Sa and the bottom space Sb are collectively referred to as “space S” as appropriate. The upper part of the space S is covered by the lid 3, and the space S is substantially sealed by the base 100 and the lid 3.
[0014]
The holding device H includes a water supply device 4 that supplies water to the space S. The water supply device 4 is provided outside the space S, and supplies the space S with water (fresh water or fresh water) from which salt has been removed or whose salt concentration has been set to a predetermined value or less. Here, the predetermined value is a salt concentration of seawater, and a salt concentration of water supplied to the space S from the water supply device 4 is set to at least a salt concentration of seawater. In the present embodiment, the water supply device 4 supplies fresh water to the space S.
[0015]
The supply operation of the water supply device 4 is controlled by the control device CONT. The water supply device 4 and the space S are connected by a supply pipe 5. A valve 7 is provided at one end of the supply pipe 5. The opening / closing operation of the valve 7 is controlled by the control device CONT. On the other hand, the other end of the supply pipe 5 extends to the bottom space Sb, and can supply fresh water to the bottom space Sb. The lid 3 has a hole 3a for disposing the supply pipe 5.
[0016]
The supply pipe 5 in the portion arranged in the bottom space Sb is formed in an annular shape as shown in FIG. The annular supply pipe 5 is provided with a plurality of nozzles 6 for spraying water on the bottom 1 b of the hole 1. A large number of nozzle portions 6 are provided at equal intervals in the annular supply pipe 5 so that water can be sprayed over a wide range of the bottom portion 1b. In addition, the shape of the supply pipe 5 arranged in the bottom space Sb is not limited to an annular shape, and may be a shape having a plurality of curved portions as shown in FIG. The supply pipe 5 is also provided with a plurality of nozzles 6 capable of spraying water toward the bottom 1b. With the configuration shown in FIG. 3B, water can be sprayed over a wide range of the bottom 1b.
[0017]
Returning to FIG. 1, the holding device H includes a discharge device 8 that can discharge water in the space S to the outside of the space S. The discharge device 8 is specifically configured by a discharge pipe having one end connected to the vicinity of the water surface of the space S, and the other end of the discharge pipe 8 is disposed in a drain side groove 101 formed on the base 100. I have. That is, the discharge pipe (discharge device) 8 can discharge water near the water surface (surface) of the space S. The discharge pipe 8 is provided with a valve 9, and the opening and closing operation of the valve 9 is controlled by the control device CONT.
[0018]
The space S is provided with a sensor (detection device) 10 capable of detecting a salt concentration contained in water in the space S. In the present embodiment, the sensor 10 is attached to the outer peripheral surface Ta of the tank T. The sensor 10 may be mounted on the inner peripheral surface 1a of the hole 1, and the sensor 10 can be mounted at any position in the space S. The detection result of the sensor 10 is output to the control device CONT.
[0019]
Next, a method of holding the tank T using the holding device H having the above-described configuration will be described.
When the tank T is disposed in the hole 1 and is supported by the support portions 2A and 2B, a space S is formed between the inner surface of the hole 1 and the outer surface of the tank T. Then, the lid 3 is provided on the upper portion of the tank T, and the space S is substantially sealed by the lid 3. Next, the control device CONT supplies fresh water to the space S by the water supply device 4. Water (fresh water) is interposed between the hole 1 and the tank T.
[0020]
When the storage location of the tank T is near the ocean, groundwater (seawater) containing salt may enter the space S via the concrete base 100 buried in the ground. However, since the fresh water is disposed in the space S, the salt concentration of the seawater into which the fresh water has entered is reduced. Therefore, the tank T is not exposed to water having a high salt concentration.
[0021]
As time passes, the salt concentration in the space S increases due to the seawater that has entered. At this time, the control device CONT opens the valve 7 of the closed supply pipe 5 and operates the water supply device 4 to supply fresh water to the space S. At the same time, the control device CONT opens the valve 9 of the closed discharge pipe 8. By doing so, the water (the water having a high salt concentration) in the substantially closed space S is discharged from the discharge pipe 8 to the outside of the space S. Then, the water having a high salt concentration disposed in the space S is exchanged for the water supplied from the water supply device 4, and the salt concentration of the water in the space S decreases.
[0022]
Here, the control device CONT performs an operation of exchanging water in the space S, that is, an operation of supplying fresh water or an operation of discharging water from the space S at predetermined time intervals. By doing so, the fresh water supply operation does not have to be performed until the salt concentration reaches a certain level, so that the fresh water is not excessively consumed.
[0023]
Of course, the control device CONT always opens the valve 9 of the discharge pipe 8 and also always opens the valve 7 of the supply pipe 5, and drives the water supply device 4 to exchange water in the space S, that is, supply operation. The discharging operation may be performed continuously. By doing so, the salt concentration of the water in the space S is always maintained at a low value.
[0024]
Alternatively, based on the salinity of the water in the space S detected by the sensor 10, the control device CONT performs a water exchange operation of the space S, that is, a water discharge operation and a water supply operation when the salinity reaches a predetermined value. It may be.
[0025]
Here, water is supplied from the supply pipe 5 so as to spray the bottom 1 b of the hole 1 via the nozzle 6. As a result, the dust and the like settled on the bottom 1b are stirred, and the stirred dust and the like are smoothly discharged from the discharge pipe 8 provided above the bottom space Sb to the outside of the space S.
[0026]
As described above, when the tank T is accommodated in the hole 1 formed in the base 100, the water having reduced salt concentration and impurity concentration is interposed between the hole 1 and the tank T, so that the tank T T can be suppressed from being exposed to groundwater containing salt and impurities. Therefore, corrosion of the tank T can be suppressed.
[0027]
Then, by setting the salt concentration of the supplied water to be a fresh water set to a predetermined value or less, the ground water containing the salt is diluted by the fresh water, and the ground water is shielded from the tank T by the fresh water. The progress of corrosion of T can be suppressed.
[0028]
Since fresh water is supplied to the bottom space Sb between the bottom 1b of the hole 1 and the bottom Tb of the tank T, the water containing salt having a high specific gravity in the lower part of the space S is stirred while the upper part is stirred. And the water in the space S can be easily discharged from the upper part. Further, by supplying water by spraying from the nozzle portion 6 toward the bottom 1b of the hole 1, dust and the like at the bottom 1b of the hole 1 are stirred, and the dust and the like are easily mixed with the water in the space S. Can be discharged.
[0029]
In the above embodiment, fresh water is supplied to the space S. However, water in which seawater is processed and the salt concentration is set to a predetermined concentration or less (salt concentration of seawater or less) may be used. That is, any water can be used as long as it can dilute the salt concentration of groundwater (seawater). The predetermined concentration can be appropriately changed based on the material of the tank.
[0030]
In the above embodiment, water is supplied to the space S, but any substance (liquid) that can delay the progress of corrosion of the tank by groundwater (seawater) may be used.
[0031]
In the above embodiment, the discharge device that discharges the water in the space S includes the discharge pipe 8 that can discharge the water near the water surface (surface) of the space S, and does not have a driving source such as a pump. With this configuration, the overall configuration of the holding device H can be simplified. Further, the position where the discharge pipe 8 is provided is not limited to the vicinity of the surface of the water in the space S, and may be set to the vicinity of the bottom.
[0032]
On the other hand, a drive source such as a pump may be provided in the discharge device so that the water in the space S can be forcibly (actively) discharged. In this case, by connecting one end of the discharge pipe 8 provided with the drive source to, for example, the bottom space Sb and connecting the other end to the side groove 101, dust or the like existing in the bottom space Sb is forced to the outside of the space S. It can be discharged. Further, by providing a drive source in the discharge device, the operation of supplying water (fresh water) to the space S by the water supply device 4 can be stopped, and the discharge operation by the discharge device can be performed. As a result, the water in the space S can be once emptied, and then the water supply device 4 performs a water supply operation to the space S, so that the space S is made of water (fresh water) having a sufficiently reduced salt concentration. Can be charged.
[0033]
In the above-described embodiment, the tank is assumed to contain the drainage generated in a power plant, a factory, or the like, but, of course, the container to be stored in the tank is not limited to the drainage. The present invention is applicable to all tanks installed in an environment exposed to groundwater or a liquid containing impurities other than groundwater.
[0034]
【The invention's effect】
As described above, since water having a lower salt concentration than seawater is interposed between the hole and the tank, the seawater can be diluted even if seawater enters the space, and the corrosion of the tank due to salt is reduced. Can be prevented. Therefore, the tank can store the contents for a long time.
[Brief description of the drawings]
FIG. 1 is a side sectional view showing one embodiment of a tank holding device of the present invention.
FIG. 2 is a sectional view taken along the line AA of FIG. 1;
FIG. 3 is a sectional view taken along line BB of FIG. 1;
[Explanation of symbols]
1 hole 1a Inner peripheral surface (inner surface) of hole
1b Bottom of hole (inner surface)
2 (2A, 2B) Support part 4 Water supply device 5 Supply pipe 6 Nozzle part 8 Exhaust pipe (discharge device)
10 Sensor (detection device)
CONT Control device H Holding device S Space Sa Side space Sb Bottom space T Tank Ta Outer surface (outer surface) of tank
Bottom of Tb tank (outer surface)

Claims (10)

A tank is installed in the hole, water is supplied to a space between the inner surface of the hole and the outer surface of the tank installed in the hole, and the water is interposed between the hole and the tank. A method for holding a tank, comprising: The method for holding a tank according to claim 1, wherein the supplied water has a salt concentration set to a predetermined value or less. 3. The method according to claim 2, wherein at least one of a water supply operation and a water discharge operation to the space is performed at predetermined time intervals. 3. The method according to claim 2, wherein a supply operation and a discharge operation of water to the space are performed continuously. 3. The tank holding method according to claim 2, wherein a salinity concentration of the water in the space is detected, and at least one of a water supply operation and a water discharge operation to the space is performed based on the detection result. The tank according to any one of claims 1 to 5, wherein the hole has a bottom, and supplies the water to a space between the bottom of the hole and the bottom of the tank. Holding method. A tank holding device for holding a tank,
A hole for accommodating the tank,
A support portion that supports the tank so as to form a space between the inner surface of the hole and the outer surface of the tank installed in the hole,
A tank holding device, comprising: a water supply device that supplies water to the space. The tank holding device according to claim 7, wherein the water supply device supplies fresh water. A control device for controlling a supply operation of the water supply device,
A detection device for detecting a salt concentration of water in the space, wherein the control device controls the water supply device based on a detection result of the detection device. Holding device. The hole has a bottom,
The water supply device has a supply pipe that supplies the water to a space between the bottom of the hole and the bottom of the tank,
The tank holding device according to any one of claims 7 to 9, wherein the supply pipe has a nozzle unit that sprays water toward a bottom of the hole.

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