JP2023013181A - Adsorbent recovery method - Google Patents

Abstract

A method for recovering an adsorbent capable of recovering an adsorbent from an adsorption tower after adsorption treatment of radioactive substances in a nuclear facility is provided. An adsorbent recovery method for recovering the adsorbent from an adsorption tower comprising a container, an adsorbent filled in the container, and a shielding container covering the outside of the container with a shielding material. a step of selecting the position of the working hole for taking out the adsorbent in the container according to the working environment and the internal structure of the adsorption tower; forming an opening in the shielding material according to the position; forming the working hole at the position from the opening; and recovering the adsorbent from the working hole based on a method for taking out the adsorbent selected according to the position. [Selection drawing] Fig. 10

Description

TECHNICAL FIELD The present invention relates to a method for recovering an adsorbent that has adsorbed radioactive substances from a storage container.

Water handled in nuclear facilities may contain substances to be treated such as radioactive strontium ions and radioactive cesium ions. The water containing the substance to be treated is adsorbed by an apparatus (also called an adsorption tower) that includes a storage container with a storage space and a particulate adsorbent filled in the storage space. (See Patent Document 1, for example). When water containing a substance to be treated flows through the inner space of the adsorption tower, the substance to be treated is adsorbed by the adsorbent, and the water is recovered as treated water that meets a predetermined standard.

Japanese Patent Application Laid-Open No. 2020-187030

After the adsorption performance of the adsorbent deteriorates, the adsorbent is temporarily stored in the storage container, but when the adsorbent needs to be treated, the adsorbent is recovered from the interior of the storage container. The adsorbent after recovery is solidified using cement, or solidified using fused glass, and stored in a predetermined storage facility for a predetermined period of time. Patent Document 1 does not propose a specific method for collecting the adsorbent.

SUMMARY OF THE INVENTION An object of the present invention is to provide an adsorbent recovery method capable of recovering an adsorbent from an adsorption tower after radioactive substances have been adsorbed in a nuclear facility.

The present invention is an adsorbent recovery method for recovering the adsorbent from an adsorption tower comprising a container, an adsorbent filled in the container, and a shielding container covering the outside of the container with a shielding material. selecting the position of the working hole for taking out the adsorbent in the container according to the working environment and the internal structure of the adsorption tower; forming an opening in the shielding material according to the position; Adsorbent recovery comprising: forming the working hole at the position from the opening; and recovering the adsorbent from the working hole based on a method for taking out the adsorbent selected according to the position. The method.

According to the present invention, by selecting a recovery method in a working environment under restricted conditions, it is possible to recover the adsorbent filled inside the container while preventing scattering.

Moreover, the present invention may include a step of forming the work hole in the lower portion of the container.

According to the present invention, by forming the work hole in the lower part of the container, the adsorbent can be dropped and collected without using power.

Further, the present invention includes a step of attaching a jig to the working hole, which is formed so as to hermetically connect the working hole and a collection container for collecting the adsorbent; may be provided with a step of dropping and recovering in the recovery container.

According to the present invention, by attaching a jig around the working hole, it is possible to prevent the adsorbent from escaping to the outside when the adsorbent falls, and to guide the adsorbent into the recovery container. .

Moreover, the present invention may include a step of forming the work hole in the upper portion of the container.

INDUSTRIAL APPLICABILITY According to the present invention, it can be applied when the space under the container is limited, or when it is easy to access the inside from the upper part of the container.

Further, the present invention may include the steps of removing the shielding material on the top of the shielding container, and removing the top of the container to form the working hole in the entire radial direction of the container. .

INDUSTRIAL APPLICABILITY According to the present invention, access to the inside of the container can be facilitated by applying it when the upper lid of the container can be removed.

Further, the present invention may include a step of inserting a suction tube into the working hole, and a step of suctioning and recovering the adsorbent through the suction tube.

INDUSTRIAL APPLICABILITY According to the present invention, it is possible to collect the adsorbent by sucking it upward by applying it when working from the upper working hole of the container.

Further, the present invention may comprise a step of inserting a screw conveyor into the work hole, and a step of transporting and collecting the adsorbent by the screw conveyor.

INDUSTRIAL APPLICABILITY According to the present invention, it is possible to transfer and recover the adsorbent upward by the screw conveyor by applying it to the case of working from the upper working hole of the container.

Further, the present invention includes a step of sealingly connecting the working hole and a recovery container for recovering the adsorbent with a flexible tube, and inverting the storage container to remove the adsorbent through the tube. and a step of storing in the collection container.

Advantageous Effects of Invention According to the present invention, it is possible to shorten the adsorbent recovery time by applying the present invention to the case of forming pre-work holes all over the container in the radial direction. In addition, by inverting the container, even if the adsorbent is stuck in the container, it can be dropped and collected as it is.

Moreover, the present invention may comprise a step of recovering the adsorbent from the working hole using a device having a mechanism for scooping the adsorbent.

INDUSTRIAL APPLICABILITY According to the present invention, it is possible to improve the collection efficiency by using a device for scooping the adsorbent by applying it to the case where the pre-work hole is formed in the entire radial direction of the container.

Moreover, the present invention may include a step of cleaning the inside of the storage container by a cleaning method selected according to the position.

According to the present invention, cleaning suitable for the working environment can be performed by selecting a cleaning method according to the position of the working hole.

Moreover, the present invention may include a step of cleaning the inside of the container through the work hole.

According to the present invention, the inside of the container can be cleaned while preventing the cleaning water from scattering by using the working hole.

Further, the present invention may include a step of collecting cleaning water from the working hole.

According to the present invention, cleaning water can be collected while preventing cleaning water from scattering by using the working hole.

Further, the present invention includes the steps of: forming a drain port at the bottom of the container; and cleaning the inside of the container through the work hole and collecting wash water from the drain port. may

According to the present invention, it is possible to improve the recovery efficiency of wash water by forming a drain port in the lower part of the storage container.

ADVANTAGE OF THE INVENTION According to this invention, an adsorbent can be collect|recovered from the adsorption tower after adsorbing a radioactive substance in a nuclear power plant.

BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing which shows roughly the structure of the adsorption tower which is an application object of this invention. It is a figure which shows roughly each process of the collection|recovery method of adsorbent. It is a perspective view which shows the lower structure of a container. FIG. 4 is a plan view showing positions of working holes in the lower structure of the container; It is a figure which shows roughly each process which dismantles an adsorption tower. FIG. 10 is a diagram schematically showing each step of an adsorbent recovery method according to Modification 1; FIG. 10 is a diagram schematically showing a process of recovering an adsorbent according to modification 2; FIG. 10 is a diagram schematically showing each step of an adsorbent recovery method according to Modification 3; FIG. 11 is a diagram schematically showing a process of recovering an adsorbent according to modification 4; It is a flowchart which shows each process of the adsorbent collection|recovery method.

As shown in FIG. 1, the adsorption tower 1 includes a container 2 in which an internal space S is formed, an adsorbent Q filled in the container 2, and a shielding material 11 covering the outside of the container 2. a container 10; The adsorption tower 1 is a purifying device that causes the adsorbent Q to adsorb the substances to be treated by circulating water containing the substances to be treated such as radioactive strontium ions and radioactive cesium ions. From the adsorption tower 1, it is possible to recover the treated water in which the concentration of the substance to be treated is below a predetermined standard.

The container 2 is formed in the shape of a tank. The container 2 has a main body 3 formed in a cylindrical shape. The upper circular opening of the main body 3 is closed by a circular dome-shaped top lid 4 (also referred to as an upper mirror). The upper lid 4 is welded to the body portion 3, for example. The upper lid 4 may be formed integrally with the body portion 3 . The upper lid 4 may be flat. A lower circular opening of the main body 3 is closed by a lower cover 5 (also referred to as a lower mirror) formed in a circular bowl shape. The lower lid 5 is welded to the body portion 3, for example. The lower lid 5 may be formed integrally with the body portion 3 . The lower lid 5 may be flat. Due to the above configuration, an internal space S is formed inside the storage container 2 .

The upper lid 4 is provided with a supply pipe 6 for supplying water containing a substance to be treated from the outside of the container 2 to the upper part of the internal space S. The upper lid 4 is provided with an opening 7 for charging the adsorbent Q into the internal space S, which can be opened and closed. Above the lower lid 5 , a piping device 8 is provided for delivering treated water from the internal space S to the outside of the container 2 . The piping device 8 is provided with a piping 9 that communicates with the outside of the container 2 . The pipe 9 may pass through the interior of the container 2 , penetrate the upper lid 4 , and reach the exterior of the container 2 . A pedestal 5A for supporting the lower lid 5 is provided at the lower portion of the lower lid 5. As shown in FIG. The lower lid 5 may be flat without the pedestal 5A.

The internal space S is filled with an adsorbent Q. As shown in FIG. The adsorbent Q is formed into particles having a particle size within a predetermined range. The adsorbent Q adsorbs substances to be treated such as strontium ions and cesium ions. The adsorbent Q is made of, for example, zeolite, silicotitanate, activated carbon, or resin.

The lateral periphery of the main body 3 is covered with a cylindrical shielding member 11 provided on the side surface of the shielding container 10 . A circular opening in the upper portion of the shielding material 11 is covered with a disk-shaped shielding material 12 that matches the shape of the opening. Above the shielding material 12, an upper structure 15 is provided that is open to the top and accommodates piping and a cooling device. A circular opening in the lower portion of the shielding material 11 is covered with a disk-shaped shielding material 13 that matches the shape of the opening. A pipe 20 for introducing air for cooling the storage container 2 is provided in the lower part of the shielding container 10 . A pipe 21 is provided in the upper part of the shielding container 10 for discharging air for cooling the container 2 .

The inner and outer surfaces of the shielding members 11-13 are made of metal plates, for example. The end faces of the shielding members 11-13 are covered with metal plates. As a result, an internal space is formed in the shielding members 11-13. The internal spaces of the shielding members 11 to 13 are filled with lead beads or cast with lead for shielding radiation. According to the above configuration, the adsorption tower 1 is configured to be able to protect the adsorbent Q from high dose radiation. On the other hand, the adsorption tower 1 has a structure that makes it difficult to recover the adsorbent Q.

Next, the adsorbent recovery method will be described. In the adsorbent recovery method, each process is set so that remote control is possible until the decontamination and dismantling of the container 2 are completed while preventing the scattering of the adsorbent Q containing the substance to be treated. In order to take out the adsorbent Q, it is necessary to form a working hole for taking out the adsorbent Q in the container 2 . The positions of the working holes are selected according to the working environment and the internal structure of the adsorption tower 1 . As for the work environment, it is assumed that remote work is also used in a limited space where measures have been taken to prevent scattering of the substance to be treated.

Therefore, it is desirable to set the overall process so as to minimize the work space and to be efficient. In addition, it is required to separate and collect the lead beads or lead metal filled in the shielding container 10 and the adsorbent Q so as not to mix them. First, the position of the working hole for taking out the adsorbent Q in the container 2 is selected. Each subsequent step is set according to the position of the working hole. First, the first method of recovering the adsorbent Q from below the adsorption tower 1 will be examined.

As shown in FIGS. 2 and 3, the first method is to drill a working hole in the lower lid 5 of the container 2 . Therefore, it is necessary to form an opening in the shielding member 13 according to the position of the working hole. The adsorption tower 1 is installed on a work table (not shown) or the like where the lower surface side of the lower shielding material 13 is exposed in a set work environment. A cylindrical jig G1 is attached to the lower surface of the shielding material 13 (see FIG. 2(1)). A circular opening 13A is formed on the lower surface side of the shielding member 13 inside the jig G1. 13 A of openings are formed using cutting tools, such as a hole saw, for example. The lead beads B filled inside the shielding material 13 are recovered from the opening 13A. The lead beads B do not necessarily have to be collected entirely.

A circular opening 13B is formed through the opening 13A on the upper surface side of the shielding member 13 (see FIG. 2(2)). The opening 13B is formed, for example, to have the same diameter as the opening 13A using a similar method. A cylindrical jig G<b>2 that contacts the lower lid 5 is attached to the lower surface of the shielding member 13 . The jig G2 is formed to hermetically connect the working hole 5B and a recovery container for recovering the adsorbent Q. As shown in FIG. The jig G2 has an outer diameter slightly smaller than the diameters of the openings 13A and 13B. The jig G2 prevents the lead beads B left in the inner space of the shielding material 13 from flowing out. A recovery container (not shown) containing the adsorbent Q is attached below the jig G1. A side surface of the jig G1 is provided with an opening G1H into which a tool or a cleaning nozzle can be inserted.

A working hole 5B is formed in the lower lid 5 of the container 2 at a position where the working hole 5B is to be formed from the openings 13A and 13B via the jig G2 (see FIG. 2(3)). A piping device 8 may be provided above the lower lid 5 inside the container 2 . In the center of the lower lid 5 there may be a part 8A of the plumbing device 8 (see FIG. 3). In such a case, the working hole 5B is formed at a predetermined position avoiding the center of the lower lid 5 (see FIG. 4). From the work hole 5B, the adsorbent Q is recovered based on the method of taking out the adsorbent selected according to the position where the work hole 5B is formed. In the first method, the adsorbent Q drops from the work hole 5B due to the action of gravity, and the dropped adsorbent Q is recovered in the recovery container.

The adsorbent Q is guided by jigs G2 and G1 and accommodated in a collection container installed below. The jigs G2 and G1 prevent the adsorbent Q from escaping to the outside. If the adsorbent Q is stuck inside the container 2, a cleaning nozzle or the like is inserted through the opening G1H and the working hole 5B to feed water into the container 2 to release the adsorbent Q from sticking. Alternatively, water or compressed air may be sent from the pipe 9 that is left, and the water or compressed air may be introduced into the container 2 via the piping device 8 to release the sticking of the adsorbent Q. After the adsorbent Q is stored in the collection container, the collection container is tightly capped and transported to a predetermined storage location.

Next, the inside of the container 2 is washed by a washing method selected according to the working environment of the first method and the internal structure of the adsorption tower 1 . A cleaning nozzle N is inserted into the storage container 2 through the opening G1H and the working hole 5B (see FIG. 2(4)). The nozzle N is a cleaning device that jets cleaning water at high pressure to clean an object. The tip of the nozzle N has, for example, a rotation mechanism that rotates based on water pressure, and is configured to be able to wash the inner wall of the container 2 in the circumferential direction.

A cleaning water recovery container (not shown) is attached below the jig G1. For example, a camera (not shown) is attached to the tip of the nozzle N, and the decontamination work is performed by the cleaning water jetted from the nozzle N while monitoring the inside of the storage container 2 . The wash water is guided by the jigs G2 and G1 and stored in a wash water recovery container installed below. The nozzle N may perform blasting such as ice blasting using ice or dry ice as a medium in addition to cleaning with cleaning water.

As shown in FIG. 5, after the container 2 has been decontaminated, the shielding container 10 and the container 2 are dismantled. The shielding container 10 and the containing container 2 are melted and reused as metal materials. For example, after the container 2 is washed, the lead beads B are collected from the shielding container 10 (see FIG. 5(1)). The shielding container 10 from which the lead beads B have been collected is dismantled and metal-melted in a predetermined facility (see FIG. 5(2)). The exposed container 2 is cut into small pieces and metal-melted in a predetermined facility (see FIG. 5(3)).

As described above, according to the adsorbent recovery method according to the first method, the adsorbent Q can be recovered from the adsorption tower 1 after radioactive substances have been subjected to adsorption treatment in nuclear power facilities. According to the adsorbent recovery method according to the first method, the adsorbent Q can be recovered while preventing the adsorbent Q from escaping from the adsorption tower 1 . According to the adsorbent recovery method according to the first method, the adsorbent Q can be recovered in a space-saving work environment so that remote work is possible. According to the adsorbent recovery method according to the first method, since the working hole 5B is formed below the container 2, it is possible to facilitate the recovery of the adsorbent Q and washing water.

[Modification 1]
As shown in FIG. 6, the upper part of the adsorption tower 1 is provided with an inlet 7 for charging the adsorbent Q. As shown in FIG. If the inlet 7 is used as a working hole, the drilling process can be omitted. A second method using the inlet 7 will be described below.

First, a cover (not shown) of the inlet 7 is removed in a working environment, and a working hole is formed (see FIG. 6(1)). The lid of the inlet 7 is fixed by, for example, a plurality of bolts. Therefore, the work hole can be formed by removing the bolt. One end of a suction tube 30 for sucking the adsorbent Q is inserted into the inlet 7 . One end of a flexible hose (not shown) is connected to the other end of the suction tube 30 . The other end of the hose is connected to a collection container (not shown). The inside of the collection container is adjusted to a negative pressure compared to the atmospheric pressure by, for example, an air pump. As a result, the adsorbent Q is sucked from the tip of the suction tube 30 (see FIG. 6(2)).

The suction tube 30 is made of, for example, a metal tube. The suction tube 30 does not necessarily have to be straight. The suction tube 30 may have a curved portion or a bent portion, or may be configured to be able to suction any position in the radial direction of the storage container 2 by adjusting the insertion angle or the rotation angle. good.

If the adsorbent Q is stuck, water or compressed air may be introduced into the storage container 2 from the suction pipe 30 to release the sticking of the adsorbent Q. Alternatively, water or compressed air may be sent from the pipe 9 that is left, and the water or compressed air may be introduced into the container 2 via the piping device 8 to release the sticking of the adsorbent Q. Alternatively, the suction tube 30 may be moved to stir the adsorbent Q to loosen the adsorbent Q from sticking. In addition to the suction tube 30, a device that applies vibration such as a vibrator may be inserted into the inlet 7 to loosen the adsorbent Q by vibration. Further, the suction tube 30 may be provided with a device that generates vibration.

The adsorbent Q is sucked from the tip of the suction tube 30 and stored in the recovery container. For example, a camera is attached to the suction tube 30 . The operator brings the suction tube 30 closer to the adsorbent Q based on the image obtained from the camera, and causes the adsorbent Q to be sucked. After the adsorbent Q is removed from the storage container 2 by suction, the nozzle N is inserted through the inlet 7 (see FIG. 6(3)). The nozzle N cleans the inside of the container 2 with high-pressure washing water to decontaminate it. The nozzle N is replaced with the drain pipe 40 when the washing water reaches a predetermined water level inside the storage container 2 or when the washing of a predetermined washing area is completed.

The drain pipe 40 is connected to a suction pump (not shown) to suck the cleaning water accumulated inside the container 2 and discharge it to the outside of the container 2 . The drain pipe 40 is connected to, for example, a cleaning water recovery container (not shown), and cleaning water is recovered in the cleaning water recovery container. If the nozzle N and the drain pipe 40 can be inserted into the input port 7, cleaning with the nozzle N and draining with the drain pipe 40 may be performed at the same time. Washing water may be discharged to the outside of the container 2 using not only the drain pipe 40 but also the pipe 9 and the piping device 8 left in the container 2 . After the inside of the container 2 is cleaned by the nozzle N, the shielding container 10 and the container 2 are dismantled (see FIG. 5).

As described above, according to the adsorbent recovery method according to the second method, the adsorbent Q can be recovered without drilling the container 2 . According to the adsorbent recovery method according to the second method, by using the inlet 7 as a work hole, the adsorbent Q can be sucked and recovered while preventing the adsorbent Q from scattering. According to the adsorbent recovery method according to the second method, the inside of the container 2 can be washed by using the inlet 7 as a work hole.

[Modification 2]
As shown in FIG. 7 , a screw conveyor 50 capable of transporting the adsorbent Q upward may be inserted into the inlet 7 . A third method using the screw conveyor 50 will be described below. The screw conveyor 50 includes, for example, a cylindrical sheath tube 51 and an auger screw 52 inserted into the sheath tube 51 . The auger screw 52 has helical teeth, for example, and can forcibly transport the adsorbent Q upward inside the sheath tube 51 by rotating in a predetermined rotational direction. Cleaning of the inside of the container 2 is the same as in the second method.

According to the adsorbent recovery method according to the third method, the adsorbent Q can be transported upward and recovered by inserting the screw conveyor 50 into the inlet 7 and rotating the auger screw 52 in a predetermined rotational direction. . According to the adsorbent recovery method according to the third method, even if the adsorbent Q is stuck, the stuck adsorbent Q is excavated by pressing it from above, and the adsorbent Q is pushed upward inside the sheath pipe 51. can be transported.

[Modification 3]
As shown in FIG. 8, the upper lid 4 of the container 2 may be removed, and the working hole 2H may be formed in the entire radial direction of the container 2 to collect the adsorbent Q. As shown in FIG. A fourth method for removing the upper lid 4 of the container 2 will be described below. In the adsorption tower 1, the superstructure 15 of the shielding vessel 10 and the shielding material 12 are removed (see FIGS. 8(1) and 8(2)). The upper lid 4 of the container 2 is removed from the opening 10H formed in the upper portion of the shielding container 10 (see FIG. 8(3)). The upper lid 4 is separated from the main body 3 by using, for example, a grinder or gas cutting.

Thereby, the working hole 2H is formed in the entire radial direction of the container 2 . The working hole 2H and a recovery container (not shown) for recovering the adsorbent Q are hermetically connected by a flexible tube FP (see FIG. 8(4)). After that, the container 2 is turned over. The adsorbent Q falls downward under the action of gravity. The adsorbent Q falls in a lump state even if it is stuck. If the adsorbent Q adheres and is difficult to drop, the adsorbent Q may be dropped while shaking the container 2 . The adsorbent Q is guided by the pipe FP and accommodated in the collection container without being dispersed outside. Cleaning of the inside of the container 2 is the same as in the second method. In cleaning the inside of the storage container 2, the cleaning water may be recovered in the cleaning water recovery container by turning the storage container 2 upside down.

According to the adsorbent recovery method according to the fourth method, the recovery time of the adsorbent Q can be significantly shortened by forming the working holes 2H throughout the container 2 in the radial direction. According to the adsorbent recovery method according to the fourth method, even if the adsorbent Q is stuck, the adsorbent Q can be dropped and recovered by inverting the entire adsorption tower 1 .

[Modification 4]
As shown in FIG. 9, when working holes 2H are formed throughout the container 2 in the radial direction, the adsorbent Q may be taken out upward from the working holes 2H and collected. A fifth method for recovering the adsorbent Q above the work hole 2H will be described below. When the work hole 2H is formed, the inside of the storage container 2 becomes easier to see. The state of the adsorbent Q can be grasped in real time. The adsorbent Q is recovered from the work hole 2H using a device such as a heavy machine J having a mechanism for scooping up the adsorbent Q, for example. The heavy machinery J is remotely operated, for example. The heavy machinery J may be operated by the crew by taking protective measures.

Any device other than the heavy machinery J may be used as long as the adsorbent Q can be scooped up. In the fifth method, the entire working environment including the adsorption tower 1 and the heavy machinery J is blocked by a building or the like in order to prevent the adsorbent Q from escaping. Cleaning of the inside of the container 2 is the same as in the second method. In cleaning the inside of the storage container 2, the cleaning water may be recovered in the cleaning water recovery container by turning the storage container 2 upside down.

As described above, according to the adsorbent recovery method according to the fifth method, the adsorbent Q can be efficiently recovered by scooping up the adsorbent Q from the work hole 2H by a device such as a heavy machine J.

[Modification 5]
Each step in the first to fifth methods described above may be combined as appropriate and executed. For example, in the cleaning steps of the second to fifth methods, the cleaning water is not drained from the lower side of the container 2, so there is a risk that it will take time to recover the cleaning water and the equipment will become large. Therefore, in the cleaning steps in the second to fifth methods, water may be drained from the lower side of the container 2 as in the first method. Therefore, a drainage port may be provided in the lower lid 5 of the container 2 before the washing step in the second to fifth methods. In this case, the drain port may be formed to have a diameter that allows the washing water to be drained. That is, in the second to fifth methods, a drainage port may be formed in the lower part of the container, and the inside of the storage container may be washed through the working hole and the washing water may be recovered from the drainage port.

In the second method and the third method, since the adsorbent Q is recovered from the input port 7, movement in the radial direction of the storage container 2 is restricted. Therefore, in the second method and the third method, the working hole 2H may be formed in the entire radial direction of the container 2 as in the fourth method and the fifth method. Thereby, the suction pipe 30 and the screw conveyor 50 can be moved to any position in the radial direction of the storage container 2, and the collection efficiency of the adsorbent Q may be improved.

The suction pipe 30 and the screw conveyor 50 may be moved along the circumferential direction of the working hole 2H to recover the adsorbent Q while loosening the adherence of the adsorbent Q. The adsorbent Q is mainly recovered by the screw conveyor 50, and the adsorbent Q remaining in the lower part of the container 2 that cannot be recovered by the screw conveyor 50 may be recovered by the suction pipe 30. In this case, the gap between the working hole 2H and the suction pipe 30 or the screw conveyor 50 is covered with a film or the like to prevent the adsorbent Q from scattering. After recovering the adsorbent Q, a drain hole may be drilled in the lower lid 5 of the container 2 from the working hole 2H side.

As described above, the steps included in the adsorbent recovery methods according to the first to fifth methods can be combined as appropriate. Each step included in the adsorbent recovery method can be optimally combined in consideration of work environment, work efficiency, and work cost.

Selection of the method for recovering the adsorbent Q in the adsorbent recovery method will be described below. As described above, each process of the adsorbent recovery method has advantages and disadvantages, and either method is selected based on constraints such as working environment, working efficiency, and working cost.

FIG. 10 shows a flow chart of each process from planning to implementation of the adsorbent recovery method. First, the position of the working hole for taking out the adsorbent Q in the container 2 is selected according to conditions such as the working environment space, the internal structure of the adsorption tower 1, and the recovery device (step S10). As for the position of the work hole, any one of the positions of the inlet 7 of the upper lid 4 of the container 2, a portion of the lower lid 5, and the entire upper lid 4 is selected.

Next, an opening is formed in the shielding material according to the position of the selected working hole (step S12). When the position of the work hole is the inlet 7 of the upper lid 4 of the container 2 and the position of the entire upper lid 4, the shielding material 12 is removed to form the opening 10H. If the work hole is located at a part of the lower lid 5, the shielding material 13 is formed with openings 13A and 13B. Next, a work hole is formed at a predetermined position from the formed opening (step S14). The working hole is formed by removing the lid of the inlet 7 of the upper lid 4 of the container 2, drilling a hole in a part of the lower lid 5, and removing the entire upper lid 4. FIG.

Next, the adsorbent is recovered from the working hole based on the adsorbent extraction method selected according to the position of the working hole (step S16). When the work hole is the input port 7, a method of sucking the adsorbent Q upward with the suction pipe 30 or a method of transporting the adsorbent Q upward with the screw conveyor 50 is applied. When the working hole is formed in the lower lid 5, a method of dropping the adsorbent Q downward and storing it in a collection container is applied. When the working holes are formed in the entire radial direction of the storage container 2, the adsorption tower 1 is turned upside down to drop the adsorbent Q downward and store it in a recovery container, or the adsorbent Q using a device such as a heavy machine J. A method of scooping upwards is applied.

Next, the inside of the container 2 is cleaned by a cleaning method selected according to the position of the work hole (step S18). When the work hole is the inlet 7, the nozzle N is inserted through the inlet 7 and the inside of the container 2 is washed. When the working hole is formed in the lower lid 5, the nozzle N is inserted through the working hole to clean the inside of the container 2. FIG. When the work hole is formed all over the container 2 in the radial direction, the inside of the container 2 is cleaned by inserting the nozzle N through the work hole.

Next, washing water is collected according to the positions of the working holes (step S20). When the work hole is the inlet 7, a drain pipe 40 is inserted into the inlet 7, and the cleaning water is sucked upward and drained. When the working hole is formed in the lower lid 5, the wash water drops downward and is stored in the wash water recovery container. When the working holes are formed in the entire radial direction of the container 2, the adsorption tower 1 is turned upside down so that the wash water falls downward and is stored in the wash water recovery container. shall apply. When the work hole is the input port 7 or formed along the entire radial direction of the container 2, a drain port is formed in the lower part of the container, and the washing water is drained from the drain port and collected in the washing water collection container. You may

Next, the shielding container 10 and the storage container are dismantled and sorted by material (step S22). Among the dismantled members, metal members are melted and recycled as metal materials if they satisfy predetermined criteria and are recyclable.

While several embodiments of the invention have been described, these embodiments have been presented by way of example and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and modifications can be made without departing from the scope of the invention. These embodiments and their modifications are included in the scope and spirit of the invention, as well as the scope of the invention described in the claims and equivalents thereof.

For example, the shielding container 10 may be configured to be dismantled with bolts or the like. The upper lid 4 of the storage container 2 may be detachable with bolts or the like. The lower lid 5 of the storage container 2 may be provided in advance with a pipe for draining washing water. The adsorbent Q may be stored in the storage container 2 in advance by filling a bag through which water can flow. The bag body may be subdivided and stored in the storage container 2 . A container may be used in addition to the bag. The adsorbent Q may be configured by stacking a plurality of cartridges.

DESCRIPTION OF SYMBOLS 1... adsorption tower, 2... container, 2H... working hole, 3... main-body part, 4... upper lid, 5... lower lid, 5A... base, 5B... working hole, 6... supply pipe, 7... inlet, 8... Piping device, 8A... parts, 9... piping, 10... shielding container, 10H... opening, 11... shielding material, 11-13... shielding material, 12... shielding material, 13... shielding material, 13A... opening, 13B... opening, 15 Upper structure 30 Suction pipe 40 Drainage pipe 50 Screw conveyor 51 Sheath pipe 52 Auger screw B Lead bead FP Pipe G1 Jig G1H Opening G2 jig, J... heavy equipment, N... nozzle, Q... adsorbent, S... internal space

Claims (10)

An adsorbent recovery method for recovering the adsorbent from an adsorption tower comprising a storage container, an adsorbent filled in the storage container, and a shielding container covering the outside of the storage container with a shielding material,
selecting the position of the working hole for taking out the adsorbent in the container according to the working environment and the internal structure of the adsorption tower;
forming an opening in the shielding material according to the position;
forming the working hole at the location from the opening;
recovering the adsorbent from the working hole based on the adsorbent extraction method selected according to the position;
Adsorbent recovery method. A step of forming the working hole in the lower part of the container,
The adsorbent recovery method according to claim 1. a step of attaching a jig formed to hermetically connect the working hole and a collection container for collecting the adsorbent to the working hole;
a step of dropping the adsorbent through the jig and recovering it in the recovery container;
The adsorbent recovery method according to claim 1 or 2. A step of forming the working hole in the upper part of the container,
The adsorbent recovery method according to claim 1. removing the shielding material on top of the shielding container;
removing an upper portion of the container and forming the working hole in the entire radial direction of the container;
The adsorbent recovery method according to claim 1. inserting a suction tube into the working hole;
a step of sucking and recovering the adsorbent through the suction tube;
The adsorbent recovery method according to any one of claims 1, 4 and 5. a step of inserting a screw conveyor into the working hole;
a step of transferring and collecting the adsorbent by the screw conveyor;
The adsorbent recovery method according to claim 4 or 5. a step of sealingly connecting the working hole and a collection container for collecting the adsorbent with a flexible tube;
a step of inverting the storage container and storing the adsorbent in the recovery container through the pipe;
The adsorbent recovery method according to claim 5. A step of recovering the adsorbent from the working hole using a device having a mechanism for scooping the adsorbent,
The adsorbent recovery method according to claim 5. A step of cleaning the inside of the container by a cleaning method selected according to the position;
The adsorbent recovery method according to any one of claims 1 to 9.

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