JP6058404B2 - Radioactive material adsorption equipment - Google Patents

Description

The present invention relates to a suction equipment for general industrial, suitable radioactive material in water treatment technology in nuclear power plants and thermal power plants, such as sewage and food processing plants.

  Conventionally, the technology for separating and recovering ions present as impurities in general industrial waste liquids and reactor water of nuclear power plants or thermal power plants is filled with an adsorbent as a method for selectively recovering specific ions in waste liquids. Adsorption systems are known.

  In addition, in the adsorption system, when passing waste liquid, it is common to install an upper screen and a lower screen to prevent the adsorbent from flowing out so that the filled adsorbent can be evenly passed. .

JP-A-3-161006

  When filling and taking out the adsorbent in the adsorber, there is a problem that it takes time because the opening of the container is small. Further, since the lower screen used in the adsorption device is installed for the purpose of preventing the adsorbent that has adsorbed the contaminants, high reliability is required. Conventional screens are generally made of metal wire, and have to be processed so as to form a uniform and fine mesh, which requires a precise and expensive processing technique.

The present invention has been made in consideration of the above-described circumstances, and uses a storage container that is fastened in a separable manner, facilitating filling and taking out of an adsorbent, and combining a general-purpose product with an inexpensive treated water recovery device. Accordingly, an object of the invention to provide a suction equipment for radioactive materials capable of performing the processing of the water to be treated effectively with preventing the outflow of the adsorbent.

In order to solve the above-described problems, the radioactive substance adsorbing device according to the present invention uniformly installs a storage container that is separably fastened, and a water to be treated that is installed at a stage subsequent to the inlet of the storage container. An inflow side screen to be diffused, an adsorbent filled in the storage container and adsorbing a radioactive substance from the water to be treated, and treated water provided in the storage container and recovering the treated water treated with the adsorbent A recovery device, and a connection pipe connecting the discharge side of the treated water recovery device and an outlet pipe connected to the treated water outlet line, the treated water recovery device prevents the adsorbent from flowing out. The treated water treated with the adsorbent is recovered and discharged from the outlet pipe to a treated water outlet line, and the treated water recovery device includes a loop-shaped water treatment discharge pipe having a number of holes, the water Woolf covering the treatment discharge pipe And filter, is characterized in that it has a said suppressing wool filter mesh covering filter member.

  Moreover, in order to solve the above-described problem, the radioactive substance adsorbing apparatus according to the present invention is the radioactive substance adsorbing apparatus according to claim 1, wherein: The shielding container is further provided with a radioactive substance shielding body provided integrally with the shielding container, and an installation table on which the shielding container is installed, and the shielding container suppresses the surface dose rate of radiation to a reference value or less. It is characterized by this.

  Furthermore, in order to solve the above-described problems, the radioactive substance adsorbing apparatus according to the present invention is the radioactive substance adsorbing apparatus according to claim 1, wherein the open type drum can installed in the storage container and the drum can In order to adjust the dimensional tolerance, an elastic body installed at the bottom of the storage container, and an elastic body installed on the lower surface of the top of the storage container to ensure the contact pressure between the open drum can and the storage container And the storage container is configured to be reusable.

  Furthermore, in order to solve the above-described problems, the radioactive substance adsorbing apparatus according to the present invention is the radioactive substance adsorbing apparatus according to claim 1, wherein the liquid to be treated remaining in the storage container is removed. A draining pump, a blower with a heater for drying the adsorbent inside the storage container, and a particle filter for removing radioactive substances from the air containing vapor generated by the blower with the heater are additionally installed, and the adsorption inside the storage container It is characterized by having a configuration for removing moisture from the agent.

  On the other hand, in order to solve the above-described problems, the radioactive substance adsorbing apparatus according to the present invention is the radioactive substance adsorbing apparatus according to any one of claims 1 and 5 to 7, wherein the adsorbing apparatus has two storage containers. As described above, they are arranged in series.

  Furthermore, in order to solve the above-described problems, the radioactive substance adsorbing apparatus according to the present invention is the radioactive substance adsorbing apparatus according to claim 1 or 5, wherein the adsorbing apparatus has two storage containers. As described above, they are arranged in parallel.

  The present invention makes it easy to fill and take out the adsorbent by using a storage container that is separably fastened, and prevents outflow of the adsorbent with an inexpensive treated water recovery device combined with general-purpose products. Treatment of treated water can be performed effectively.

1 is an external perspective view showing a first embodiment of a radioactive substance adsorbing device according to the present invention. The longitudinal cross-sectional view which shows the adsorption | suction apparatus of the radioactive substance which concerns on 1st Embodiment, and follows the AA line of FIG. The top view of FIG. 2 which shows the radioactive substance adsorption | suction apparatus which concerns on 1st Embodiment. The plane sectional view showing the treated water recovery device provided in the storage container of the adsorption device of the radioactive substance concerning a 1st embodiment. Sectional drawing which follows the BB line of FIG. The longitudinal cross-sectional view which shows the adsorption | suction apparatus of the radioactive substance which concerns on 2nd Embodiment. The longitudinal cross-sectional view which shows the adsorption | suction apparatus of the radioactive substance which concerns on 3rd Embodiment, and follows the CC line of FIG. The top view of FIG. The block diagram which shows the adsorption | suction apparatus of the radioactive substance which concerns on 4th Embodiment, and demonstrates the time of drain pump operation. The block diagram which shows the adsorption | suction apparatus of the radioactive substance which concerns on 4th Embodiment, and shows the time of blower operation. The other embodiment of the radioactive substance adsorption | suction apparatus is shown, and the block diagram which shows the multistage serial connection structure of the storage container which connected the several storage container in series. The block diagram which shows the parallel connection structure of the storage container which connected the several storage container in parallel.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

[First Embodiment]
A first embodiment of a radioactive substance adsorption device according to the present invention will be described with reference to FIGS.

  1 is a perspective view showing an external appearance of a radioactive substance adsorption device according to a first embodiment, FIG. 2 is a schematic longitudinal sectional view of the adsorption device shown in FIG. 1, and FIG. 3 is a plan view of the adsorption device. It is.

  The adsorption device 10 shown in FIGS. 1 and 2 constitutes an adsorption tower, and has a storage container 11 that is fastened (coupled) so as to be separable. The storage container 11 constitutes a sealed container that can be divided into two by combining the outer peripheral flange 12 a of the container lower part 12 and the outer peripheral flange 13 a of the container upper part 13. A plurality of radially extending U-grooves 14 and 15 are provided on the outer peripheral flanges 12a and 13a of the storage container 11 so as to face each other vertically, and each radial pair of U-grooves 14 and 15 opens radially outward. doing. The container lower part 12 and the container upper part 13 which comprise the storage container 11 are comprised by shape | molding and processing with the metal material of carbon steel or stainless steel.

  In addition, swing bolt fastening mechanisms 16 are detachably provided in opposing pairs of U grooves 14 and 15 formed on the outer peripheral flanges 12a and 13a of the storage container 11, respectively. The swing bolt fastening mechanism 16 is housed by inserting a swing bolt 18 that swings around a fulcrum P of the base material base 17 into the U grooves 14 and 15, swinging it up, turning it and tightening a tightening nut 19. The outer peripheral flanges 12a and 13a of the container 11 can be tightened together. The head of the swing bolt 18 is configured in the form of a suspension bolt.

  Thus, both outer peripheral flanges 12a and 13a of the storage container 11 are joined together, the swing bolt fastening mechanism 16 is positioned in each pair of U-grooves 14 and 15, and the swing bolt 18 of the swing bolt fastening mechanism 16 is attached. The two outer peripheral flanges 12 a and 13 a are joined and tightened by swinging up and tightening with the tightening nut 19.

  On the other hand, each of the tightened swing bolt fastening mechanisms 16 is removed from the U-grooves 14 and 15 by turning the tightening nut 19 in the loosening direction and then swinging it and tilting it outward in the radial direction. By operating and removing each swing bolt fastening mechanism 16, the storage container 11 can remove the container upper part 13 from the container lower part 12. Thereby, the container lower part 12 can be opened largely.

  As described above, the container upper part 13 and the container lower part 12 can be easily and easily attached and detached and tightened by using the swing operation of the swing bolt fastening mechanism 16 and the nut tightening and nut loosening operations in combination. . Reference numeral 20 denotes an O-ring that seals the inside of the storage container 11 in a liquid-tight manner.

  Although the container lower part 12 and the container upper part 13 of the storage container 11 have been described with an example in which outer peripheral flanges 12a and 13a are integrally formed and detachably attached by a simple swing bolt fastening mechanism 16, the outer peripheral flanges 12a and 13a The swing bolt fastening mechanism 16 attached to the U grooves 14 and 15 is not necessarily limited. For example, the container lower part 12 and the container upper part 13 may be joined by fastening with general bolts and nuts, or may be joined by welding. The storage container 11 can be opened largely by removing the container upper part 13, and the adsorbent 24 can be easily filled and removed.

  Further, as shown in FIG. 2, the storage container 11 of the adsorption device 10 is provided with a water inlet 22 to be treated at the top, and an inflow side screen 23 is provided inside the storage container 11 so as to cover the inlet 22. The inflow side screen 23 uniformly diffuses the treated water supplied from the treated water inlet 22 and uniformly guides the treated water to the adsorbent 24. The water to be treated guided by the adsorbent 24 is treated and cleaned here to become treated water. In addition, the code | symbol 23a shows an example of the perforated plate which diffuses to-be-processed water.

  The adsorbent 24 is suitable for adsorbing radioactive substances such as radioactive cesium, radioactive iodine, radioactive cobalt, and radioactive strontium, and includes mordenite (natural zeolite), silicotitanate, ferrocyanide, and the like. As an example of the silicotitanium oxide that is the adsorbent 24, there are particulates of 1 mmφ or less, for example, 0.75 mmφ, or copper ferrocyanide or cobalt ferrocyanide fixed to a granular anion exchange resin. The adsorbent 24 which is a granular material is accommodated in the storage container 11 which can be divided into two parts, and is filled up to a level position corresponding to the outer peripheral flange 12a of the container lower part 12.

  A treated water recovery device 25 is installed in the storage container 11. The treated water recovery device 25 includes a treated water discharge mechanism 26 provided at the bottom of the container lower portion 12 of the storage container 11 and a wool filter that is installed on the treated water discharge mechanism 26 and prevents the adsorbent 24 from flowing out. And the like, and a mesh-like filter holding member 28 that covers the filter 27 is combined. Commercially available general-purpose products are used for the treated water discharge mechanism 26, the filter 27, and the filter holding member 28 constituting the treated water recovery device 25, and can be produced at low cost.

The filter 27 prevents the adsorbent 24 from being discharged together with the treated water. The water to be treated which is a cleaning liquid or a waste liquid is treated with the adsorbent 24 to adsorb and capture the radioactive substance, and then guided to the wool filter 27 through the filter holding member 28 such as a filter fixing mesh. The filter 27 is configured to have an adsorbent outflow prevention structure in which the treated water treated with the adsorbent 24 can pass through, but the adsorbent 24 that has captured the radioactive substance does not flow out. For example, when the particle diameter d of the adsorbent 24 is d ₁ <d <d ₂ (the hole diameter of the water treatment discharge pipe 29), the filter 27 is desirably a mesh diameter having a hole diameter of d ₁ or less.

  The filter holding member 28 of the treated water recovery device 25 is, for example, a filter fixing mesh. The filter fixing mesh 28 is for fixing the wool filter 27 on the treated water discharge mechanism 26. The filter fixing mesh 28 is provided with a storage recess for installing the treated water discharge mechanism 26. The filter fixing mesh 28 can accommodate the treated water discharge mechanism 26 therein. The filter fixing mesh 28 shown in FIG. 4 has a circular shape, but may be stored in the storage container 11 and is not limited to a circular shape.

  On the other hand, as shown in FIG. 3, the treated water discharge mechanism 26 provided on the bottom of the container lower part 12 of the storage container 11 has a polygonal shape such as a rectangle, a circular shape, or a loop-shaped water treatment discharge tube 29 such as an oval shape. For example, the hole 30 is formed of an inexpensive PVC pipe and has an array of holes 30 having an opening area larger than the cross-sectional area for discharging treated water. For example, in the loop-shaped water treatment discharge pipe 29, in one example, a number of 2 mmφ drill holes are provided in a row at a pitch interval of 6 mm along the longitudinal direction of the pipe.

  Further, the discharge side of the treated water recovery device 25 has a water treatment discharge pipe 29 of the treated water discharge mechanism 26 protruding sideways, then curved and rising upward, and is extended at the upper part in the storage container 11. A flexible connecting pipe 33 such as rubber connected to the pipe 32 is provided. For this reason, the discharge side of the treated water recovery device 25 is connected from the water treatment discharge pipe 29 of the treated water discharge mechanism 26 to the treated water outlet line (not shown) via the rubber connection pipe 33 and the outlet pipe 32, and this treated water outlet line. Discharged through.

  As shown in FIG. 2, the rubber connection pipe 33 is installed on the upper part of the treated water recovery device 25 and is used for connection with the treated water outlet PVC pipe as the outlet pipe 32. By separating the rubber connecting pipe 33 and the outlet pipe (treated water outlet PVC pipe) 32, the container upper part 13 can be removed. The outlet pipe 32 is led out of the storage container 11 through an opening formed at the top of the storage container 11, and the outlet pipe 32 inserted through the opening of the storage container 11 is detachably closed by a sealing jig 34. The The sealing jig 34 is composed of, for example, a Wilson seal.

  Thus, when the used adsorption device 10 is transferred to a storage or the like, the outlet pipe (treated water outlet PVC pipe) 32 is extracted, and the treated water inlet 22 and the Wilson seal 34 are closed and stored. The container 11 can be stored stably.

[Operation of First Embodiment]
According to the radioactive substance adsorbing device 10 according to the first embodiment, the storage container 11 as an adsorption tower is detached from the container lower part 12 by detaching the container upper part 13 from the container lower part 12 by the detachment operation of the swing bolt fastening mechanism 16. be able to. When the container upper part 13 is removed, the storage container 11 is greatly opened, and the treated water recovery device 25 can be installed in the storage container 11 through the opening, or the adsorbent 24 can be filled into the storage container 11 or taken out. .

  Further, the treated water recovery device 25 is inexpensive because it can be configured by assembling a commercially available treated water absorbing mechanism 26, a filter 27, and a filter holding member 28.

  Further, the adsorption device 10 sets the treated water recovery device 25 in the storage container 11 and connects the discharge side of the treated water recovery device 25 to the outlet pipe 32 via the flexible connection pipe 33 while storing the processed water. The preparatory work is completed by filling the adsorbent 24 to the required level in the container 11.

  Subsequently, for the purification operation of the water to be treated, the water to be treated is supplied into the storage container 11 of the adsorption device 10 from the water inlet 22 to be treated. The treated water supplied from the treated water inlet 22 is uniformly diffused by the inflow side screen 23, guided to the adsorbent 24, and passed through the adsorbent 24. The adsorbent 24 adsorbs and captures radioactive substances such as radioactive cesium contained in waste liquid or cleaning liquid as water to be treated.

  The treated water that has been purified by adsorbing radioactive substances from the water to be treated is then sent to the treated water recovery device 25, passes through the mesh-like filter restraining member 28, and is reliably captured by the adsorbent 24 by the wool filter 27. This prevents the adsorbent 24 from flowing out.

  On the other hand, the treated water recovery device 25 constitutes an adsorbent outflow prevention structure, and the treated water that has passed through the wool filter 27 has a radioactive substance lowered to, for example, a detection limit (0.2 ppm) or less, and the treated water discharge mechanism. 26 is recovered. The purified treated water that has been purified is collected from the water passage hole (hole 30) of the treated water discharge mechanism 26 and sent to the water treatment discharge pipe 29. The treated water then passes from the water treatment discharge pipe 29 of the treated water discharge mechanism 26 through the rubber connection pipe 33, is discharged outside the storage container 11, and is sent to a treated water outlet line (not shown).

  Thus, in the treated water recovery apparatus 25, the filter 27 constitutes an adsorbent outflow prevention structure, and it is possible to reliably prevent the fine granular adsorbent 24 from flowing out of the storage container 11. Moreover, since the treated water recovery device 25 is constructed by assembling the treated water discharge mechanism 26, the filter 27, and the filter holding member 28, which are commercially available general-purpose products, it can be manufactured at low cost.

[Effect of the first embodiment]
According to the radioactive substance adsorption device of the first embodiment, the storage container 11 can be easily and easily detached from the container lower part 12 by operating the swing bolt fastening mechanism 16 to remove the storage container 11. It can be opened greatly. Therefore, the adsorbent 24 can be filled and removed easily and smoothly.

  The treated water recovery device 25 constitutes an adsorbent outflow prevention structure, and can be assembled easily and inexpensively using a general-purpose treated water discharge mechanism 26, a filter 27, and a filter holding member 28. Thus, the outflow of the adsorbent 24 can be reliably prevented.

[Second Embodiment]
FIG. 6 shows a second embodiment of the radioactive substance adsorption device.

  This radioactive substance adsorbing apparatus 10A is provided with a bottomed cylindrical shield container 37 in which the radioactive substance adsorbing apparatus 10 shown in the first embodiment is installed on an adsorption tower installation table 36. . Since the configuration of the storage container 11 accommodated in the shield container 37 is not different from the radioactive substance adsorbing device 10 shown in the first embodiment, the same components are denoted by the same reference numerals, and redundant description is omitted. Or simplify.

  In the suction device 10A of the second embodiment shown in FIG. 6, similarly to the suction device 10 shown in the first embodiment, the container lower portion 12 and the container upper portion 13 of the storage container 11 are detachably joined, and each outer peripheral flange 12a. , 13a and a plurality of swing bolt fastening mechanisms 16 attached to the U-grooves 14 and 15 are detachably fastened. A treated water recovery device 25 is provided in the storage container 11, and the adsorbent 24 is stored and filled on the treated water recovery device 25.

  The shielding container 37 is accommodated and installed so as to surround the storage container 11 composed of the container lower part 12 and the container upper part 13 in order to shield radiation from the adsorbent 24 that has taken in the radioactive substance. The shield container 37 is stably installed in the storage recess 36 a at the top of the fixed installation stand 36, and the storage container 11 serving as an adsorption tower is inserted and stored in the shield container 37. The shield container 37 in which the storage container 11 is installed is covered with a lid 38 as necessary.

  On the other hand, a torus-shaped or sleeve lead shield 39 is integrally provided and stored in the bottomed cylindrical shield container 37 to prevent radiation from being scattered outside the shield container 37. A shield container 37 is installed on the adsorption tower installation stand 36, and is installed around the storage container 11 which is an adsorption tower. The height of the shielding container 37 is preferably about 2 m so that a person is not exposed to scattered radiation. By adjusting the thickness of the shield 39 according to the radioactivity concentration of impurities contained in the water to be treated, the surface dose rate of radiation can be easily set to a reference value or less.

  Next, the operation of the radioactive substance adsorption device will be described.

  According to the adsorption device 10A according to the second embodiment, the surface dose rate of the shield container 37 can be set to a reference value or less. When discarding the adsorbing device 10A, the storage container 11 is stored in the shield container 37, taken out from the installation base 36 fixed together with the shield container 37, and is not shown by a forklift or the like using the suspension bolt 40. Can be transported to storage. The amount of exposure of workers can be greatly reduced. At this time, the shield container 37 is provided independently from the storage container 11 which is an adsorption tower, and an expensive shield container can be repeatedly reused.

[Effects of Second Embodiment]
The radioactive substance adsorbing device 10A according to the second embodiment can achieve the same effects as those of the first embodiment, and the storage container 11 is provided in the shield container 37. The surface dose rate of radiation can be reduced below the required reference value. Furthermore, since the shielding container 37 can install the storage container 11 independently, it can be repeatedly reused.

[Third Embodiment]
7 and 8 show a third embodiment of the radioactive substance adsorption device.

  The radioactive substance adsorbing device 10B has a configuration in which a drum can 45 is installed in a storage container 11 that is fastened in a separable manner, and elastic bodies 46 and 47 are provided on the bottom and top of the storage container 11 in the first embodiment. The configuration is basically different from the configuration of the radioactive substance adsorption device 10 described in the embodiment. Since other configurations are not different from the adsorption device 10 described in the first embodiment, the same configurations and functions are denoted by the same reference numerals, and redundant descriptions are omitted or simplified.

  In the radioactive substance adsorbing device 10B shown in the third embodiment, an open drum 45 having an open top is accommodated in a storage container 11 fastened in a separable manner. A rubber sheet is installed at the bottom of the storage container 11 as an elastic body 46 having a required thickness, and the dimensional tolerance of the drum can 45 is adjusted by the rubber sheet 46. A sponge rubber sheet is provided on the back side of the top of the storage container 11 as an elastic body 47 that secures a required contact pressure between the drum 45 and the storage container 11.

  The suction device 10B shown in the third embodiment is substantially the same as the suction device 10 shown in FIG. 1 except that a drum can 45, a rubber sheet 46, and a sponge rubber sheet 47 are additionally provided. Not different. The sponge rubber sheet 47 is installed on the lower surface of the container upper portion 12 so that the outside of the drum can 45 is not contaminated with the cleaning water that is the treated water, and the rubber sheet 46 is disposed on the lower portion of the container 12 to adjust the dimensional tolerance of the drum can 45. Installed at the bottom with a suitable rubber thickness.

  The open drum 45 is accommodated in a storage container 11 composed of a container lower part 12 and a container upper part 13. In the drum 45, an adsorbent 24 and a treated water recovery device 25 are provided. The adsorbent 24 is filled and accommodated in the drum can 45. In this case, the adsorbent 24 can be filled to the vicinity of the connecting pipe 33 beyond the installation level of the outer peripheral flanges 12a and 13a of the storage container 11.

[Operation of Third Embodiment]
The radioactive substance adsorption device 10B according to the third embodiment has substantially the same effect as the adsorption device 10 described in the first embodiment. The storage container 11 of the adsorption device 10 </ b> B can easily attach and detach the container upper part 13 from the container lower part 12 by the attachment and detachment operation of each swing bolt fastening mechanism 16. When the container upper part 13 is removed, the storage container 11 opens greatly, and the drum can 45 can be easily taken in and out.

  Further, since the drum can 45 is an open type with the top opened, even if the drum can 45 is accommodated from the large opening of the storage container 11, the top of the drum can 45 is greatly opened, so that the treated water recovery device 25 can be installed. It is easy, and the adsorbent 24 can be easily filled and removed from the drum can 45.

  Further, when the adsorbing device 10B is discarded, if the storage container 11 is detached from the upper part 13 of the container, the upper part of the drum can 45 is largely exposed, and the drum can 45 can be taken out from the lower part 12 of the storage container 11 and discarded. . Therefore, when discarding the adsorption device 10B, only the inexpensive drum can 45 can be discarded, and the storage containers of the expensive container lower part 12 and container upper part 13 can be reused.

[Effect of the third embodiment]
According to the third embodiment, the same effect as the suction device 10 described in the first embodiment can be obtained, and the storage container 11 can be detached from the container lower part 12 by the detachment operation of the swing bolt fastening mechanism 16. The open drum 45 can be easily inserted and removed from the large opening. Since the open drum 45 has a large opening at the top, it is possible to easily fill and take out the adsorbent into the drum 45.

  Further, when discarding the adsorption device 10B, only the inexpensive drum can 45 can be discarded, and the expensive container lower part and container upper part can be reused repeatedly.

[Fourth Embodiment]
FIG. 9 and FIG. 10 are schematic configuration diagrams showing a fourth embodiment of the radioactive substance adsorption device.

  The adsorbing device 10C shown in the fourth embodiment has substantially the same configuration as the adsorbing device 10 described in the first embodiment, and is the fourth in comparison with the adsorbing device 10 in the first embodiment. The adsorption device 10C of the embodiment is connected to the upstream side of the treated water inlet 22 of the storage container 11 via the inlet three-way valve 50, one from the treated water pipe 51 to the atmosphere opening side, and the other connected to the particle filter 52, A configuration in which one side is connected to a drain pump 55 and the other side is connected to a blower 56 with a heater via an outlet three-way valve 54 on the downstream side of the outlet pipe 32 from the storage container 11 is added.

  The storage container 11A of the suction device 10C constituting the fourth embodiment has substantially the same configuration as the storage container 11 provided in the suction device 10 of the first embodiment. Therefore, in describing the adsorption device 10C of the fourth embodiment, the same components as those of the adsorption device 10 shown in the first embodiment are denoted by the same reference numerals, and the description of the overlapping configuration and operation is omitted. Or simplify.

  The adsorbing device 10 </ b> C shown in FIG. 9 has a drain pump 55 connected to the downstream side of the outlet pipe 32 via an outlet three-way valve 54. The drain pump 55 is a self-contained pump for discharging the water to be treated remaining inside the storage container 11A, which is an adsorption tower.

  As shown in FIG. 10, a blower 56 with a heater is connected to the downstream side of the outlet pipe 32 of the adsorption device 10 </ b> C via an outlet three-way valve 54. This blower 56 with heater switches the outlet three-way valve 54 to blow warm air in the direction opposite to the flow of water by treatment of the treated water, thereby drying the adsorbent (24) filled in the storage container 11A. Is for. Steam generated when the adsorbent 24 in the storage container 11 </ b> A is dried by blowing air from the blower 56 with heater is generated from steam generated when the adsorbent 24 is dried with warm air from the blower 56 with heater. Provided to remove radioactive material.

  9 and 10, the treated water outlet pipe 32 and the treated water inlet 22 pipe 51 accommodated in the shielding container 37 and connected to the installed storage container 11A are adsorption towers. It is preferable that the apparatus 10C is disposed with a downward slope in the direction of the storage container 11A and does not remain in the water to be treated or the pipe of the treated water.

[Operation of Fourth Embodiment]
In the radioactive substance adsorbing device 10C according to the fourth embodiment, the inlet three-way valve 50 and the outlet three-way valve 54 are set as shown in FIG. 9 when the drain pump is operated. According to this adsorbing device 10C, when exchanging the adsorbing device 10C, the inlet three-way valve 50 that is the adsorbing device inlet valve is switched to the atmosphere opening side, and the outlet three-way valve 54 that is the adsorbing device outlet valve is switched to the drain pump 55 side. Switch to.

  The inlet three-way valve 50 and the outlet three-way valve 54 are maintained in the switching state shown in FIG. 9, and the water to be treated in the storage container 11A, which is an adsorption tower, passes through the outlet pipe 32 and the outlet three-way valve 54 from the treated water recovery device (not shown). The drain is drained to the outside by the drain pump 55.

  On the other hand, when operating the blower with heater 56, the inlet three-way valve 50 and the outlet three-way valve 54 are switched as shown in FIG. The heater-equipped blower 56 is operated while maintaining this switching state.

  Due to the operation of the blower with heater 56, the warm air heated by the heater is blown in the reverse direction from the outlet three-way valve 54 through the outlet pipe 32 and guided to the adsorbent 24 in the storage container 11A. While the adsorbent 24 is dried by the hot air guided to the adsorbent 24, the steam generated when the adsorbent 24 is dried becomes waste wind and is sent to the particle filter 52 through the inlet three-way valve 50. Here, the radioactive material contained in the vapor is adsorbed and captured to prevent the radioactive material from flowing out to the outside environment.

  The adsorbent 24 is loosened and dried by warm air from the blower 56 with a heater, and the radioactive material is separated and removed from the adsorbent 24. 32 is closed using a closing flange (not shown). With the treated water inlet 22 and the treated water outlet pipe 32 of the storage container 11A closed, it is confirmed that the radiation dose of the adsorption device 10C is kept below a specified value.

  After confirming that the radiation dose of the adsorption device 10C is equal to or less than the specified value, the adsorption device 10C can be completely moved to a storage (not shown) and stored.

  In the fourth embodiment, the example in which the adsorbent 24 is dried with warm air from the heater using the heater-equipped blower 56 is shown. However, the drying of the adsorbent 24 is not limited to hot air drying, and cold air is used. It may be dried by.

[Other Embodiments]
FIG. 11 and FIG. 12 show another embodiment of the radioactive substance adsorption apparatus.

  Although the adsorption apparatuses 10 to 10C shown in the first to fourth embodiments have been described with respect to the example in which the storage container 11 (11A) is installed alone, the radioactive substance adsorption apparatus 10D (10E) is another example. As shown in the embodiment, a connection arrangement structure in which a plurality of storage containers 11 as adsorption towers are connected may be configured.

  The radioactive substance adsorbing device 10D shown in FIG. 11 shows a connection example of the storage containers 11 and 11 having a series multistage structure in which a plurality of, for example, two storage containers 11 and 11 are connected in series. Since the storage containers 11 and 11 at each stage are not different from the storage container 11 shown in the first embodiment, the same components are denoted by the same reference numerals and description thereof is omitted.

  The radioactive substance adsorbing device 10D has a radiation purification process for removing radioactive substances from the water to be treated, by connecting each storage container 11 in series in a multistage structure, so that the treated water discharged from the final stage storage container 11 is removed from the treated water. It becomes even better, and the radioactive substance is lowered to the detection limit (0.2 ppm) or less, and the contaminated water can be decontaminated well.

  Further, the radioactive substance adsorption device 10E shown in FIG. 12 shows an example of a parallel connection structure in which a plurality of, for example, two storage containers 11, 11 are connected in parallel. Even if one of the plurality of storage containers 11, 11 breaks down due to a trouble or the like, it is possible to continue and continue the treatment of the water to be treated in the remaining storage containers 11.

  FIGS. 11 and 12 show examples in which two storage containers are connected in series or connected in parallel as the radioactive substance adsorption apparatuses 10D and 10E. However, there are a plurality of adsorption apparatuses constituting the adsorption tower. The storage containers 11 and 11 having a multistage series connection structure in which the units are connected in series may be configured in one set, and the storage containers 11 and 11 of each set may be connected in parallel.

  In each of the embodiments of the radioactive substance adsorption apparatus, the example of cleaning water or waste liquid containing radioactive substance has been described as the water to be treated. However, this adsorption apparatus is not limited to reactor water or waste liquid from a nuclear power plant. It can be applied not only to treated water but also to separating and recovering ions present as impurities from general industrial waste liquid, thermal power plant reactor water, and surface water (seawater and fresh water) containing radioactive iodine and cesium. it can.

  10, 10A, 10B, 10C, 10D, 10E ... Adsorption device, 11, 11A ... Storage container (sealed container), 12 ... Lower container, 12a ... Outer flange, 13 ... Upper container, 13a ... Outer flange, 14, 15 ... U groove, 16 ... swing bolt fastening mechanism, 17 ... base material base, 18 ... swing bolt, 19 ... clamping nut, 20 ... O-ring, 22 ... treated water inlet, 23 ... inflow side screen, 24 ... adsorbent, 25 ... treated water recovery device, 26 ... treated water discharge mechanism, 27 ... filter (wool filter), 28 ... filter restraining member, 29 ... water treatment discharge pipe, 30 ... hole (water passage hole), 32 ... outlet pipe, 33 Connection pipe (rubber connection pipe) 34 Seal joint (Wilson seal) 36 Installation base (adsorption tower installation base) 37 Screen shield container 38 Cover body 39 Screen shield (lead shield) 40 ... hanging Bolt, 45 ... drum can, 46 ... elastic body (rubber sheet), 47 ... elastic body (sponge rubber sheet), 50 ... inlet three-way valve, 51 ... treated water piping, 52 ... particle filter, 54 ... outlet three-way valve, 55 ... Drain pump, 56 ... Blower with heater.

Claims (8)

A storage container fastened in a separable manner;
An inflow side screen that is installed downstream of the inflow port of the storage container and uniformly diffuses the water to be treated;
An adsorbent filled in the storage container and adsorbing a radioactive substance from the water to be treated;
A treated water recovery device that is provided in the storage container and recovers the treated water treated with the adsorbent;
It has a connecting pipe that connects the discharge side of this treated water recovery device and the outlet pipe connected to the treated water outlet line,
The treated water collection device collects the treated water treated with the adsorbent while preventing the adsorbent from flowing out,
Discharged from the outlet pipe to the treated water outlet line ,
The treated water recovery device is
A loop-shaped water treatment discharge pipe having a number of holes;
A wool filter covering the water treatment discharge pipe;
An apparatus for adsorbing a radioactive substance, comprising: a mesh-like filter holding member that covers the wool filter . The storage container is configured to be split by combining an outer peripheral flange at the upper part of the container and an outer peripheral flange at the lower part of the container,
Both outer peripheral flanges of the container upper part and the container lower part are provided with a plurality of U-grooves opened radially,
The radioactive substance adsorption device according to claim 1, wherein swing bolt fastening mechanisms are detachably provided in radial U grooves of the outer peripheral flanges. The receiving container, the adsorption apparatus of radioactive material according to claim 1 or 2 seal joint is provided in the insertion port for guiding the outlet pipe. The radioactive substance adsorption device according to claim 1,
A bottomed cylindrical shield container for storing the storage container;
A radioactive substance shield integrally provided in the shield container;
An installation base for installing the shield container;
The said shielding body container suppressed the surface dose rate of the radiation below the reference value, The adsorption | suction apparatus of the radioactive substance characterized by the above-mentioned. The radioactive substance adsorption device according to claim 1,
An open drum can installed in the storage container;
In order to adjust the dimensional tolerance of the drum, an elastic body installed at the bottom of the storage container;
In order to ensure the contact pressure between the open drum and the storage container, an elastic body installed on the bottom lower surface of the storage container is provided,
An apparatus for adsorbing a radioactive substance, wherein the storage container is configured to be reusable. In the radioactive substance adsorption device according to claim 1 or 5 ,
A pump for draining the liquid to be treated remaining inside the storage container;
A blower with a heater for drying the adsorbent inside the storage container;
A particle filter that removes radioactive substances from the air containing steam generated by this heater blower is additionally installed.
An apparatus for adsorbing a radioactive substance, comprising a structure for removing moisture from an adsorbent inside the storage container. In the adsorption apparatus radioactive material of claim 1 and claims 4 to 6, wherein the suction device suction apparatus of radioactive material, wherein the container is arranged in series two or more. In the adsorption apparatus of radioactive material according to claim 1 and claims 4 to 6, wherein the suction device suction apparatus of radioactive material, wherein the container is arranged in parallel two or more.

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