JP2020067426A - Fluid recovery device and method, and water jet machining device - Google Patents

Abstract

To suppress an increase in a cost of radioactive waste treatment by reducing the radioactive waste to be treated, in a fluid recovery device and method, and a water jet machining device.SOLUTION: The fluid recovery device comprises: a recovery container 11 for recovering jet water including cutting material sprayed to a structure 200; a conveyance line L11 conveying the jet water recovered by the recovery container 11; and a washing device 12 provided in the conveyance line L11, and decontaminating the cutting material included in the jet water.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a fluid recovery device and method for recovering a used fluid containing a cutting material and removing radioactive substances adhering to the cutting material, and a water jet processing apparatus including the fluid recovery device.

  For example, in a nuclear power plant, when replacing a decommissioning reactor or a steam generator of a nuclear reactor, it is necessary to dismantle the reactor and the steam generator, and the cut members are treated as radioactive waste. For cutting a structure such as a nuclear reactor, for example, a water jet processing device is used. The water jet processing device cuts the structure by jetting jet water containing a cutting material to the cutting position of the structure. At this time, the jet water containing the cutting material after cutting is collected by the collecting device.

  An example of the jet water recovery device is described in Patent Document 1 below. The radioactive waste recovery device described in Patent Document 1 recovers jet water containing used cutting material and separates the cutting material and cutting powder from the jet water by a cyclone separator and a filter.

JP, 2007-303942, A

  By the way, when a structure such as a nuclear reactor is cut by a water jet processing device, radioactive materials are attached to the cutting material and cutting powder contained in the recovered jet water. Therefore, the cutting material separated from the jet water is treated as radioactive waste. Then, in addition to the cut pieces of the structure, the cutting material used for cutting also becomes radioactive waste, and there is a problem that the amount of radioactive waste to be processed increases.

  The present invention is intended to solve the above-described problems, and an object of the present invention is to provide a fluid recovery device and method, and a water jet processing device that reduce radioactive waste to be processed and suppress an increase in processing cost.

  A fluid recovery device of the present invention for achieving the above object, a recovery means for recovering a fluid containing a cutting material injected to a processing target member, and the fluid contained in the fluid recovered by the recovery means. And a cleaning device that decontaminates the cutting material.

  Therefore, since the fluid containing the used cutting material is collected by the collection means and the cutting material is decontaminated, the cutting material contained in the fluid can be removed even when processing the member to be processed to which the radioactive substance is attached. It is possible to decontaminate, there is no need to treat the cutting material contained in the fluid as radioactive waste, the amount of radioactive waste to be treated can be reduced, and an increase in treatment cost can be suppressed.

  The fluid recovery apparatus of the present invention is characterized in that the fluid containing the cutting material decontaminated by the cleaning apparatus is reused.

  Therefore, since the fluid containing the decontaminated cutting material is reused, the material cost can be reduced.

  In the fluid recovery device of the present invention, the cleaning device includes a cleaning tank that stores the fluid, a cleaning liquid supply device that supplies a cleaning liquid to the cleaning tank, and a stirring device that stirs the fluid stored in the cleaning tank. And a separation filter for separating an acidic component contained in the fluid after cleaning.

  Therefore, by supplying the cleaning liquid to the fluid stored in the cleaning tank and then stirring it, the radioactive substances adhering to the cutting material can be easily removed, and the acidic components contained in the fluid after cleaning can be removed. By separating and treating with a separation filter, it can be treated as wastewater and radioactive waste can be reduced more effectively.

  In the fluid recovery device of the present invention, the recovery means has a transfer line for transferring the fluid, and the cleaning device is provided in the transfer line.

  Therefore, since the cleaning device decontaminates the cutting material contained in the fluid conveyed through the conveyance line, the decontamination of the cutting material can be efficiently performed.

  In the fluid recovery device of the present invention, a swarf separation device for separating swarf having a larger specific gravity or a larger particle size than the cutting material from the fluid is provided on the upstream side of the cleaning device in the transfer line. It has a feature.

  Therefore, after the cutting material having a specific gravity larger than that of the cutting material or having a larger particle size than the cutting material is separated from the fluid by the chip separation device, the cutting material is decontaminated, so that the processing amount of the member to be decontaminated is reduced and The decontamination treatment can be easily performed.

  In the fluid recovery device of the present invention, a chip separation device for separating chips having a specific gravity or a larger particle size than the cutting material from the fluid is provided on the downstream side of the cleaning device in the transfer line. It has a feature.

  Therefore, after decontaminating cutting materials, cut pieces, chips, etc., the chips are separated from the fluid with a specific gravity or a particle size larger than that of the cutting materials by the chip separation device, so that radioactive substances are attached. All the cutting materials, cut pieces, chips, etc. present are decontaminated, and the decontamination process can be simplified and the decontamination cost can be reduced.

  The fluid recovery apparatus of the present invention is characterized in that a concentration adjusting device capable of adjusting the concentration of the cutting material in the fluid containing the cutting material decontaminated by the cleaning device is provided.

  Therefore, since the concentration of the cutting material in the fluid containing the cutting material decontaminated by the concentration adjusting device is adjusted, the fluid containing the cutting material can be circulated and reused, and the processing cost can be reduced.

  In the fluid recovery apparatus of the present invention, the concentration adjusting device replenishes the concentration adjusting tank with the cutting agent and water, which stores the fluid containing the cutting agent decontaminated by the cleaning device. A replenishing device, a stirring device that stirs the fluid stored in the concentration adjustment tank, and a fluid supply device that supplies the fluid whose concentration has been adjusted in the concentration adjustment tank to a water jet nozzle. .

  Therefore, the fluid containing the decontaminated cutting material is stored in the concentration adjusting tank, the replenishing device replenishes the concentration adjusting tank with an appropriate amount of cutting material and water, and the stirring device agitates the fluid stored in the concentration adjusting tank. After that, the fluid supply device supplies the concentration-adjusted fluid to the water jet nozzle, so that the processing operation can be performed with the fluid having the optimum concentration.

  In the fluid recovery device of the present invention, a particle removal filter for removing a substance having a particle size larger than the particle size of the cutting material contained in the fluid is provided on the upstream side of the concentration adjusting device in the transfer line. I am trying.

  Therefore, in order to adjust the concentration of the cutting material in the fluid by the concentration adjusting device after removing the substances with large particle diameter contained in the fluid by the particle removal filter, when recycling the fluid containing the cutting material, It is possible to suppress clogging of the pipes that form the transfer line due to the substance having a diameter.

  The fluid recovery apparatus of the present invention is characterized in that a bubble removal cyclone that removes bubbles contained in the fluid is provided on the upstream side of the cleaning device in the transfer line.

  Therefore, after the bubbles contained in the fluid are removed by the bubble removal cyclone, the decontamination process of the fluid containing the cutting material is performed by the cleaning device, so that the decontamination process can be appropriately performed.

  Further, the fluid recovery method of the present invention, a recovery step of recovering the fluid containing the cutting material sprayed to the processing target member, a cleaning step of decontaminating the cutting material contained in the recovered fluid, It is characterized by having.

  Therefore, even when processing the member to be processed to which the radioactive substance is attached, it is possible to decontaminate the cutting material contained in the fluid, and there is no need to treat the cutting material contained in the fluid as radioactive waste, The amount of radioactive waste to be processed can be reduced and an increase in processing cost can be suppressed.

  In the fluid recovery device of the present invention, the recovery means has a recovery container for recovering the fluid containing the cutting material.

  Therefore, since the fluid containing the collected cutting material is temporarily stored in the collection container, the scattering of the cutting material can be suppressed.

  In the fluid recovery device of the present invention, the recovery container has a first cover that covers a surface of the processing target member that ejects the fluid, and a second cover that covers a back surface of the processing target member. The transport line is connected to the first cover and the second cover.

  Therefore, since the both sides of the member to be processed are covered with the first cover and the second cover, the fluid containing the used cutting material can be properly collected in the corner cover, and the fluid collected in the collection container can be transferred to the transfer line. Can be easily transported to the cleaning device.

  A water jet processing device of the present invention has the fluid recovery device.

  Therefore, since the fluid containing the used cutting material is recovered and the cutting material is decontaminated, the cutting material contained in the fluid is decontaminated even when processing the member to be processed to which the radioactive substance is attached. Therefore, it is not necessary to treat the cutting material contained in the fluid as radioactive waste, the amount of radioactive waste to be treated can be reduced, and an increase in treatment cost can be suppressed.

  According to the fluid recovery apparatus and method and the water jet processing apparatus of the present invention, it is possible to reduce radioactive waste to be processed and suppress an increase in processing cost.

FIG. 1 is a schematic configuration diagram showing the fluid recovery device of the first embodiment. FIG. 2 is a schematic view showing a work of cutting a structure and a work of recovering a fluid. FIG. 3 is a schematic configuration diagram showing the fluid recovery device of the second embodiment. FIG. 4 is a schematic configuration diagram showing the fluid recovery device of the third embodiment.

  Hereinafter, preferred embodiments of a fluid recovery apparatus and method and a water jet processing apparatus according to the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the present invention is not limited to this embodiment, and when there are a plurality of embodiments, the present invention also includes those configured by combining the embodiments.

[First Embodiment]
FIG. 1 is a schematic configuration diagram showing a fluid recovery device of a first embodiment, and FIG. 2 is a schematic diagram showing a cutting work and a fluid recovery work of a structure.

  In the first embodiment, as shown in FIG. 1, the fluid recovery device 10 recovers and reuses a fluid (hereinafter referred to as jet water) containing a cutting material injected from the water jet processing device 100. Is.

  For example, in a nuclear power plant, when decommissioning a nuclear reactor, it is necessary to dismantle various structures constituting the nuclear reactor. The water jet processing apparatus 100 is used for cutting this structure. The water jet processing device 100 cuts by jetting jet water containing a cutting material to a structure. Then, the fluid recovery device 10 recovers the jet water containing the cutting material after cutting the structure. At this time, since the radioactive substance adheres to the surface of the structure, the radioactive substance also adheres to the cutting material contained in the recovered jet water.

  The fluid recovery device 10 of the first embodiment removes radioactive substances adhering to the cutting material by decontaminating the cutting material contained in the recovered jet water. The fluid recovery device 10 includes a recovery container 11, a transfer line L11, and a cleaning device 12.

  As shown in FIG. 2, the water jet processing device 100 jets jet water containing a cutting material to a structure (member to be processed) 200 to be disassembled. The water jet processing device 100 includes a water jet nozzle 101 to which water is supplied, and a nozzle head 102 attached to the tip of the water jet nozzle 101. The structure 200 is arranged in water, the water jet nozzle 101 is extended into the water from above, and the nozzle head 102 is positioned at a processing position (cutting position) of the structure 200. As the cutting material, for example, a silicon carbide-based cutting material, an alumina-based cutting material, or the like is applied, and the particle size is several microns.

  The recovery container 11 includes a first cover 21 and a second cover 22. The first cover 21 covers the surface 200a of the structure 200 that jets jet water with a predetermined gap. The second cover 22 covers the rear surface 200b of the front surface 200a of the structure 200 with a predetermined gap. The first cover 21 and the second cover 22 are arranged so as to face each other with the structure 200 in between. The water jet nozzle 101 is mounted so that its tip portion penetrates the first cover 21. Although not shown, the recovery container 11 can be moved with respect to the structure 200 by a moving device. When the water jet nozzle 101 cuts while moving along the surface 200 a of the structure 200, the first cover 21 moves integrally with the water jet nozzle 101, and the second cover 22 follows the first cover 21. To move.

  The transport line L11 has a first branch line L12 and a second branch line L13. The first pump 23 is attached to the first branch line L12, and the second pump 24 is attached to the second branch line L13. The first branch line L12 is connected to the first cover 21, and the second branch line L13 is connected to the second cover 22.

  As shown in FIG. 1, the fluid recovery device 10 includes a recovery container 11, a bubble removal cyclone 31, a chip separation device 32, a water storage tank 33, a particle removal filter 34, a cleaning device 12, and a concentration adjustment along a transport line L11. The device 35 is provided in sequence.

  The bubble removing cyclone 31 removes bubbles contained in the recovered jet water. The air bubble removal cyclone 31 is connected to an intermediate portion in the vertical direction at the downstream end of the first transport line L21 from the recovery container 11. Compressed air may be introduced into the jet water, and the bubble removal cyclone 31 discharges bubbles such as compressed air contained in the jet water from the upper portion to process it as off-gas, and the jet water containing the cutting material from the lower portion. Is discharged to the second transport line L22. When the jet water does not contain bubbles, the bubble removing cyclone 31 may be omitted.

  The chip separating device 32 separates chips having a larger specific gravity or a larger particle size than the cutting material from the jet water. The chip separating device 32 is a cyclone, and the downstream end of the second transport line L22 is connected. The chip separating device 32 is not limited to a cyclone, and may be a bag filter having coarse mesh. The recovered jet water contains not only cutting materials but also cutting pieces and chips generated when the structure 200 is cut. The chip separation device 32 discharges the cutting pieces and chips contained in the jet water from the lower part by gravity separation, and discharges the jet water containing the cutting material to the third transport line L23 from the upper part.

  The water storage tank 33 temporarily stores jet water containing cutting material from which cutting pieces and chips have been separated. A particle removal filter 34 is connected to the water storage tank 33 via a fourth transport line L24.

  The particle removal filter 34 removes substances having a particle size larger than the particle size of the cutting material contained in the jet water. The fourth transport line L24 is provided with a pump 41 and a three-way valve 42, and filter wash water can be supplied from the three-way valve 42. The particle removal filter 34 separates, for example, a substance having a particle size of several tens of microns or more and discharges it as a large particle, and a cutting material having a particle size of less than several tens of microns is mixed with water to form a fifth particle. It is discharged to the transport line L25.

  The cleaning device 12 decontaminates the cutting material contained in the jet water. The cleaning device 12 includes a cleaning tank 51, a cleaning liquid supply device 52, a stirring device 53, and a separation filter 54. The cleaning tank 51 stores the jet water transferred by the fifth transfer line L25, and the cleaning liquid supply device 52 supplies the cleaning liquid to the cleaning tank 51. Here, the cleaning liquid is nitric acid or sulfuric acid. The stirring device 53 stirs the jet water containing the cutting material and the cleaning liquid by rotating the stirring blade with a motor, for example. Therefore, in this cleaning tank 51, the radioactive substance adhering to the cutting material is removed by the cleaning liquid. The cleaning tank 51 is connected to the separation filter 54 via the sixth transport line L26. The separation filter 54 separates the acidic component contained in the washed jet water. The sixth transport line L26 is provided with a pump 55 and a three-way valve 56, and filter wash water can be supplied from the three-way valve 56. The separation filter 54 separates the acidic components contained in the jet water and then performs wastewater treatment (for example, neutralization treatment), and discharges the jet water from which the acidic components have been separated to the seventh transport line L27.

  The concentration adjusting device 35 can adjust the concentration of the cutting material in the jet water containing the cutting material that has been decontaminated by the cleaning device 12 and has been transported by the seventh transport line L27. The concentration adjusting device 35 includes a concentration adjusting tank 61, a replenishing device 62, a stirring device 63, a turbidity meter (concentration meter) 64, and a jet water supply device 65. The concentration adjusting tank 61 stores jet water containing the cutting material decontaminated by the cleaning device 12. The replenishing device 62 replenishes the concentration adjusting tank 61 with the cutting material and water. The stirring device 63 stirs the jet water stored in the concentration adjusting tank 61 and the cutting material and water supplied from the replenishing device 62. The turbidity meter 64 detects the turbidity (concentration) of the cutting material in the jet water stored in the concentration adjusting tank 61. The jet water supply device 65 is a high-pressure pump mounted on the eighth transport line L28, and supplies the jet water whose concentration has been adjusted in the concentration adjusting tank 61 to the water jet supply line L29.

  The water jet supply line L29 supplies the supplied water to the water jet nozzle 101 of the water jet processing apparatus 100 by the high pressure pump 71. The water jet supply line L29 is provided with a three-way valve 72, and the eighth transfer line L28 is connected to the three-way valve 72.

  Here, a fluid recovery method by the above-described fluid recovery device 10 will be described. The fluid recovery method includes a recovery step of recovering the jet water containing the cutting material sprayed onto the structure 200 and a cleaning step of decontaminating the cutting material contained in the recovered jet water.

  The water jet processing device 100 jets jet water containing a cutting material from a nozzle head 102 of a water jet nozzle 101 to a cutting position of a structure 200. Then, the structure 200 is cut by the jet water containing the jetted cutting material, and the cut pieces and chips generated together with the jet water are collected in the collection container 11. The jet water collected in the collecting container 11 is carried on the carrying line L11 by the pumps 23 and 24.

  That is, the jet water containing the cutting material collected in the collection container 11 is transported to the bubble removal cyclone 31 by the first transport line L21. The bubble removal cyclone 31 removes the bubbles contained in the recovered jet water and processes it as off gas. On the other hand, the jet water from which bubbles have been removed is conveyed to the chip separating device 32 by the second conveying line L22. The chip separation device 32 separates the cut pieces and chips of the structure 200 from the jet water containing the cutting material by specific gravity separation. Here, the separated cutting pieces and chips are separately decontaminated or treated as radioactive waste. On the other hand, the jet water from which the cut pieces and chips have been separated is temporarily stored in the water storage tank 33 by the third transport line L23. The jet water stored in the water storage tank 33 is transported to the particle removal filter 34 by the fourth transport line L24 by driving the pump 41. The particle removal filter 34 separates large particles contained in the jet water. The jet water from which the large-sized particles have been removed is transferred to the cleaning device 12 by the fifth transfer line L25.

  In the cleaning device 12, the jet water containing the cutting material is supplied to the cleaning tank 51. The cleaning liquid supply device 52 supplies the cleaning liquid to the jet water in the cleaning tank 51. The stirring device 53 stirs the jet water and the cleaning liquid in the cleaning tank 51 to remove the radioactive substance adhering to the cutting material by the cleaning liquid. The jet water containing the cutting material, the cleaning liquid, and the radioactive substance stored in the cleaning tank 51 are transferred to the separation filter 54 by the sixth transfer line L26 by driving the pump 55. The separation filter 54 separates the acidic components (cleaning liquid and radioactive substance) contained in the jet water and performs wastewater treatment (for example, neutralization treatment). The jet water from which the acidic components have been separated is conveyed to the concentration adjusting device 35 by the seventh conveying line L27.

  In the concentration adjusting device 35, the jet water containing the cutting material is supplied to the concentration adjusting tank 61. The turbidity meter 64 detects the turbidity (concentration) of the cutting material in the jet water stored in the concentration adjusting tank 61. The replenishing device 62 replenishes the concentration adjusting tank 61 with the cutting material and water based on the turbidity of the cutting material in the jet water detected by the turbidity meter 64. Here, the optimum turbidity of the cutting material in the jet water used in the water jet processing device 100 is set in advance. The replenishing device 62 replenishes the cutting material and water so that the turbidity of the cutting material in the jet water stored in the concentration adjusting tank 61 becomes the optimum turbidity. When the turbidity of the cutting material in the jet water stored in the concentration adjusting tank 61 is adjusted to the optimum turbidity by the replenishing device 62, the jet water supplying device 65 causes the jet water in the concentration adjusting tank 61 to be adjusted by the eighth transfer line L28. Is supplied to the water jet supply line L29 for reuse.

  As described above, in the fluid recovery device of the first embodiment, the recovery container (recovery means) 11 for recovering the jet water containing the cutting material sprayed onto the structure 200, and the recovery container 11 are recovered. A transport line (recovery means) L11 for transporting jet water and a cleaning device 12 provided on the transport line L11 for decontaminating the cutting material contained in the jet water are provided.

  Therefore, since the jet water containing the used cutting material is collected in the collection container 11 and the cutting material is decontaminated, it is included in the jet water even when the structure 200 to which the radioactive material is attached is cut. The cutting material contained in the jet water can be decontaminated, the cutting material contained in the jet water does not need to be treated as radioactive waste, and the amount of radioactive waste to be treated can be reduced to suppress an increase in treatment cost. .

  In the fluid recovery device of the first embodiment, the jet water containing the cutting material decontaminated by the cleaning device 12 is reused. Therefore, the material cost of the cutting material can be reduced.

  In the fluid recovery device of the first embodiment, as the cleaning device 12, a cleaning tank 51 that stores jet water, a cleaning liquid supply device 52 that supplies the cleaning liquid to the cleaning tank 51, and the jet water stored in the cleaning tank 51 are agitated. An agitating device 53 and a separation filter 54 for separating the acidic components contained in the jet water after cleaning are provided. Therefore, by supplying the cleaning liquid to the jet water stored in the cleaning tank 51 and then stirring the cleaning liquid, the radioactive substance adhering to the cutting material can be easily removed, and at the same time, the radioactive substance contained in the cleaning jet water is contained. By separating the acidic component with the separation filter 54 and treating it, it can be treated as waste water, and the radioactive waste can be reduced more effectively.

  In the fluid recovery device of the first embodiment, the transfer line L11 for transferring the fluid is provided, and the cleaning device 12 is provided in the transfer line L11. Therefore, since the cleaning device 12 decontaminates the cutting material contained in the jet water transported on the transportation line L11, the cleaning material can be efficiently decontaminated.

  In the fluid recovery device of the first embodiment, a chip separating device 32 for separating chips having a specific gravity or a particle size larger than that of the cutting material from the jet water is provided upstream of the cleaning device 12 in the transfer line L11. There is. Therefore, after the cutting powder having a specific gravity larger than that of the cutting material or having a larger particle size is separated from the jet water by the cutting chip separation device 32, the cutting material is decontaminated, so that the processing amount of the member to be decontaminated is reduced. The decontamination process of the cutting material can be easily performed.

  The fluid recovery device of the first embodiment is provided with the concentration adjusting device 35 capable of adjusting the concentration of the cutting material in the jet water containing the cutting material decontaminated by the cleaning device 12. Therefore, since the concentration of the cutting material in the jet water containing the cutting material decontaminated by the concentration adjusting device 35 is adjusted, the jet water containing the cutting material can be circulated and reused, and the processing cost can be reduced. .

  In the fluid recovery device of the first embodiment, as the concentration adjusting device 35, a concentration adjusting tank 61 that stores jet water containing the cutting material decontaminated by the cleaning device 12, and a cutting material and water are supplied to the concentration adjusting tank 61. A replenishing device 62, a stirring device 63 that stirs the jet water stored in the concentration adjusting tank 61, and a jet water supply device 65 that supplies the jet water whose concentration is adjusted in the concentration adjusting tank 61 to the water jet nozzle 101. It is provided. Therefore, the jet water containing the decontaminated cutting material is stored in the concentration adjusting tank 61, the replenishing device 62 replenishes the concentration adjusting tank 61 with an appropriate amount of cutting material and water, and the stirring device 63 is stored in the concentration adjusting tank 61. After stirring the jet water thus prepared, the jet water supply device 65 supplies the jet water whose concentration has been adjusted to the water jet nozzle 101, so that it is possible to carry out the processing operation with the jet water having the optimum concentration.

  In the fluid recovery device of the first embodiment, a particle removal filter 34 for removing a substance having a particle size larger than the particle size of the cutting material contained in the jet water is provided on the upstream side of the concentration adjusting device 35 in the transfer line L11. . Therefore, in order to adjust the concentration of the cutting material in the jet water by the concentration adjusting device 35 after removing the substance having a large particle diameter contained in the jet water by the particle removal filter 34, the jet water containing the cutting material is circulated and reused. When doing so, it is possible to suppress clogging of the pipes forming the transport line L11 due to the substance having a large particle size.

  In the fluid recovery device of the first embodiment, a bubble removal cyclone 31 that removes bubbles contained in jet water is provided upstream of the cleaning device 12 in the transfer line L11. Therefore, the decontamination process can be properly performed because the decontamination process of the jet water containing the cutting material is performed by the cleaning device 12 after the bubbles included in the jet water are removed by the bubble removal cyclone 31.

  In the fluid recovery device of the first embodiment, a recovery container 11 for recovering jet water containing cutting material is provided. Therefore, since the jet water containing the collected cutting material is temporarily stored in the collection container 11, the scattering of the cutting material can be suppressed.

  In the fluid recovery device of the first embodiment, as the recovery container 11, a first cover 21 that covers the front surface 200a of the structure 200 that jets jet water, and a second cover 22 that covers the back surface 200b of the structure 200 are provided. The transport line L11 is connected to the first cover 21 and the second cover 22. Therefore, since both sides of the structure 200 are covered with the first cover 21 and the second cover 22, jet water containing the used cutting material can be properly collected in the covers 21 and 22, and the collection container 11 The jet water collected in 1 above can be easily transported to the cleaning device 12 by the transport line L11.

  Further, in the fluid recovery method of the first embodiment, a recovery step of recovering the jet water containing the cutting material sprayed onto the structure 200, and decontamination of the cutting material contained in the recovered jet water. And a cleaning step to perform. Therefore, even when cutting the structure 200 to which the radioactive substance is attached, the cutting material contained in the jet water can be decontaminated, and the cutting material contained in the jet water needs to be treated as radioactive waste. And the amount of radioactive waste to be treated can be reduced and an increase in treatment cost can be suppressed.

  Further, the water jet processing device of the first embodiment has the fluid recovery device 10. Therefore, since the jet water containing the used cutting material is collected and the cutting material is decontaminated, the cutting material contained in the jet water is removed even when processing the structure 200 to which the radioactive material is attached. It is possible to dye, and there is no need to treat the cutting material contained in the jet water as radioactive waste, and it is possible to reduce the amount of radioactive waste to be treated and suppress an increase in treatment cost.

[Second Embodiment]
FIG. 3 is a schematic configuration diagram showing the fluid recovery device of the second embodiment. The members having the same functions as those in the first embodiment described above are designated by the same reference numerals, and detailed description thereof will be omitted.

  In the second embodiment, as shown in FIG. 3, the fluid recovery device 10A includes a recovery container 11, a transfer line L11, and a cleaning device 12.

  The fluid recovery device 10A is provided with a recovery container 11, a bubble removal cyclone 31, a cleaning device 12, a chip separation device 32, a water storage tank 33, a particle removal filter 34, and a concentration adjustment device 35 in this order along the transport line L11. That is, in the fluid recovery device 10A of the second embodiment, a chip separation device 32 that separates chips having a specific gravity or particle size larger than that of the cutting material from the jet water downstream of the cleaning device 12 in the transfer line L11. Is provided.

  The collection container 11, the bubble removing cyclone 31, the cleaning device 12, the chip separating device 32, the water storage tank 33, the particle removing filter 34, and the concentration adjusting device 35 have the same functions as in the first embodiment. Therefore, the description is omitted.

  Therefore, the water jet processing device 100 ejects the jet water containing the cutting material from the nozzle head 102 of the water jet nozzle 101 to the cutting position of the structure 200. Then, the structure 200 is cut by the jet water containing the jetted cutting material, and the cut pieces and chips generated together with the jet water are collected in the collection container 11. The jet water collected in the collecting container 11 is carried on the carrying line L11 by the pumps 23 and 24.

  The recovered jet water is transferred to the bubble removal cyclone 31 by the first transfer line L21. The bubble removal cyclone 31 removes the bubbles contained in the recovered jet water and processes it as off gas. On the other hand, the jet water from which bubbles have been removed is transported to the cleaning device 12 by the second transport line L22.

  In the cleaning device 12, the jet water containing cutting pieces, cutting chips, and cutting material is supplied to the cleaning tank 51. The cleaning liquid supply device 52 supplies the cleaning liquid to the jet water in the cleaning tank 51. The stirring device 53 stirs the jet water and the cleaning liquid in the cleaning tank 51 to remove cutting pieces, chips, and radioactive substances adhering to the cutting material by the cleaning liquid. The jet water containing the cutting material, the cleaning liquid, and the radioactive substance stored in the cleaning tank 51 are transferred to the separation filter 54 by the sixth transfer line L26 by driving the pump 55. The separation filter 54 separates the acidic components (cleaning liquid and radioactive substance) contained in the jet water and performs wastewater treatment (for example, neutralization treatment). The jet water from which the acidic components have been separated is conveyed to the chip separating device 32 by the third conveying line L23.

  The chip separation device 32 separates the cut pieces and chips of the structure 200 from the decontaminated jet water by specific gravity separation. Here, the separated cutting pieces and chips are treated as general waste because they have been decontaminated. On the other hand, the jet water from which the cut pieces and chips have been separated is temporarily stored in the water storage tank 33 by the fifth transfer line L25 and is transferred to the particle removal filter 34 by the fourth transfer line L24. The particle removal filter 34 separates large particles contained in the jet water. The jet water from which the large-sized particles have been removed is transported to the concentration adjusting device 35 by the seventh transport line L27.

  In the concentration adjusting device 35, the jet water containing the cutting material is supplied to the concentration adjusting tank 61. The turbidity meter 64 detects the turbidity (concentration) of the cutting material in the jet water stored in the concentration adjusting tank 61. Based on the turbidity of the cutting material in the jet water detected by the turbidity meter 64, the replenishing device 62 replenishes the cutting material and water so that the turbidity of the cutting material becomes the optimum turbidity. When the turbidity of the cutting material in the jet water is adjusted to the optimum turbidity, the jet water supply device 65 supplies the jet water in the concentration adjusting tank 61 to the water jet supply line L29 for reuse by the eighth transfer line L28. To do.

  As described above, in the fluid recovery device according to the second embodiment, chips that separate the chips having a specific gravity or particle size larger than that of the cutting material from the jet water on the downstream side of the cleaning device 12 in the transfer line L11. A separating device 32 is provided.

  Therefore, after decontaminating the cutting material, cutting pieces, chips, etc., the chips are separated from the jet water by the chip separation device 32 to have a specific gravity larger than that of the cutting material or a particle size larger than that of the cutting water. All the cutting materials, cut pieces, chips, etc. being processed are decontaminated, so that the decontamination process work can be simplified and the decontamination process cost can be reduced.

[Third Embodiment]
FIG. 4 is a schematic configuration diagram showing the fluid recovery device of the second embodiment. The members having the same functions as those in the first embodiment described above are designated by the same reference numerals, and detailed description thereof will be omitted.

  In the third embodiment, as shown in FIG. 4, the fluid recovery device 10B includes a recovery container 11, a transfer line L11, and a cleaning device 12.

  The fluid recovery device 10B is provided with a recovery container 11, a bubble removal cyclone 31, a cleaning device 12, a water storage tank 33, a particle removal filter 34, and a concentration adjustment device 35 in order along the transport line L11. That is, in the fluid recovery device 10B of the third embodiment, the chip separation device 32 (see FIG. 3) is eliminated and the particle removal filter 34 is also used.

  Note that the collection container 11, the bubble removal cyclone 31, the cleaning device 12, the water storage tank 33, the particle removal filter 34, and the concentration adjusting device 35 have the same functions as those in the first embodiment, so description thereof will be omitted. .

  Therefore, the water jet processing device 100 ejects the jet water containing the cutting material from the nozzle head 102 of the water jet nozzle 101 to the cutting position of the structure 200. Then, the structure 200 is cut by the jet water containing the jetted cutting material, and the cut pieces and chips generated together with the jet water are collected in the collection container 11. The jet water collected in the collecting container 11 is carried on the carrying line L11 by the pumps 23 and 24.

  The recovered jet water is transferred to the bubble removal cyclone 31 by the first transfer line L21. The bubble removal cyclone 31 removes the bubbles contained in the recovered jet water and processes it as off gas. On the other hand, the jet water from which bubbles have been removed is transported to the cleaning device 12 by the second transport line L22.

  In the cleaning device 12, the jet water containing cutting pieces, cutting chips, and cutting material is supplied to the cleaning tank 51. The cleaning liquid supply device 52 supplies the cleaning liquid to the jet water in the cleaning tank 51. The stirring device 53 stirs the jet water and the cleaning liquid in the cleaning tank 51 to remove cutting pieces, chips, and radioactive substances adhering to the cutting material by the cleaning liquid. The jet water containing the cutting material, the cleaning liquid, and the radioactive substance stored in the cleaning tank 51 are transferred to the separation filter 54 by the sixth transfer line L26 by driving the pump 55. The separation filter 54 separates the acidic components (cleaning liquid and radioactive substance) contained in the jet water and performs wastewater treatment (for example, neutralization treatment). The jet water from which the acidic components have been separated is temporarily stored in the water storage tank 33 by the fifth transfer line L25, and is transferred to the particle removal filter 34 by the fourth transfer line L24.

  The particle removal filter 34 separates the cut pieces of the structure 200, chips, and large-sized particles from the decontaminated jet water. Here, the cut pieces, chips, and large-diameter particles that have been separated are treated as general waste because they have been decontaminated. On the other hand, the jet water from which the cut pieces, chips, and large-sized particles have been separated is conveyed to the concentration adjusting device 35 by the seventh conveying line L27.

  In the concentration adjusting device 35, the jet water containing the cutting material is supplied to the concentration adjusting tank 61. The turbidity meter 64 detects the turbidity (concentration) of the cutting material in the jet water stored in the concentration adjusting tank 61. Based on the turbidity of the cutting material in the jet water detected by the turbidity meter 64, the replenishing device 62 replenishes the cutting material and water so that the turbidity of the cutting material becomes the optimum turbidity. When the turbidity of the cutting material in the jet water is adjusted to the optimum turbidity, the jet water supply device 65 supplies the jet water in the concentration adjusting tank 61 to the water jet supply line L29 for reuse by the eighth transfer line L28. To do.

  As described above, in the fluid recovery apparatus according to the third embodiment, the cut pieces of the structure 200, cutting chips, and large-sized particles are separated from the jet water decontaminated by the particle removal filter 34. Therefore, by eliminating the chip separating device 32 that separates the cut pieces and the chips with specific gravity, the device can be simplified and the cost can be reduced.

  In the above-described embodiment, the cleaning device 12 is configured to supply the jet water containing the cutting material and the cleaning liquid to the cleaning tank 51 to remove the radioactive substance attached to the cutting material by the cleaning liquid. However, the configuration is not limited to this. For example, polishing decontamination using a cyclone or high-pressure cleaning may be used.

  Further, in the above-described embodiment, when the water jet processing device 100 cuts the structure 200 in water, the fluid recovery devices 10, 10A, and 10B recover the used jet water in water. It is not limited to this embodiment. For example, when the water jet processing device 100 cuts the structure 200 in the air, the fluid recovery devices 10, 10A and 10B are configured to recover the used jet water in the recovery device 11 in the machine. Good.

  Further, in the above-described embodiment, the fluid recovery devices 10, 10A, and 10B are used jets when cutting the structure 200 constituting the reactor by the water jet processing device 100 when the reactor is decommissioned. Although it has been described that water is collected, the application destination is not limited to this embodiment. For example, it may be applied when replacing a steam generator or various pipes constituting a nuclear reactor. Further, it may be applied to the case of processing a structure or waste material of a nuclear power plant in which a damage accident has occurred.

10, 10A, 10B Fluid recovery device 11 Recovery container 12 Cleaning device 21 First cover 22 Second cover 23 First pump 24 Second pump 31 Bubble removal cyclone 32 Chip separation device 33 Water storage tank 34 Particle removal filter 35 Concentration adjustment device 41,55 Pump 42,56,72 Three-way valve 51 Cleaning tank 52 Cleaning liquid supply device 53 Stirring device 54 Separation filter 61 Concentration adjusting tank 62 Replenishing device 63 Stirring device 64 Turbidimeter 65 Jet water supply device 71 High pressure pump 100 Water jet processing Device 101 Water jet nozzle 102 Nozzle head 200 Structure (member to be processed)
L11 transport line

Claims (14)

Collection means for collecting the fluid containing the cutting material sprayed to the processing target member,
A cleaning device for decontaminating the cutting material contained in the fluid collected by the collecting means,
A fluid recovery device comprising:   The fluid recovery device according to claim 1, wherein the fluid containing the cutting material decontaminated by the cleaning device is reused.   The cleaning device includes a cleaning tank for storing the fluid, a cleaning liquid supply device for supplying a cleaning liquid to the cleaning tank, a stirring device for stirring the fluid stored in the cleaning tank, and the cleaning fluid. The fluid recovery device according to claim 1 or 2, further comprising a separation filter that separates the acidic component that is generated.   The fluid recovery device according to any one of claims 1 to 3, wherein the recovery means has a transfer line for transferring the fluid, and the cleaning device is provided in the transfer line. .   The chip separation device for separating chips having a specific gravity or a particle size larger than that of the cutting material from the fluid is provided on the upstream side of the cleaning device in the transport line. Fluid recovery device.   5. A chip separating device for separating chips having a specific gravity or a particle size larger than that of the cutting material from the fluid is provided on the downstream side of the cleaning device in the transport line. The fluid recovery device according to claim 1.   The concentration adjusting device capable of adjusting the concentration of the cutting material in the fluid containing the cutting material decontaminated by the cleaning device is provided. Fluid recovery device.   The concentration adjusting device includes a concentration adjusting tank for storing the fluid containing the cutting material decontaminated by the cleaning device, a replenishing device for supplying the cutting material and water to the concentration adjusting tank, and the concentration adjusting tank. The fluid recovery device according to claim 7, further comprising: a stirring device that stirs the fluid stored in the fluid storage device, and a fluid supply device that supplies the fluid whose concentration is adjusted in the concentration adjustment tank to a water jet nozzle. apparatus.   8. A particle removal filter for removing a substance having a particle size larger than the particle size of the cutting material contained in the fluid is provided on the upstream side of the concentration adjusting device in the transport line. 8. The fluid recovery device according to item 8.   The fluid recovery device according to claim 4, further comprising a bubble removal cyclone that removes bubbles contained in the fluid, which is provided upstream of the cleaning device in the transfer line. .   The fluid recovery device according to any one of claims 4 to 10, wherein the recovery means has a recovery container for recovering the fluid containing the cutting material.   The recovery container has a first cover that covers a surface of the processing target member that ejects the fluid, and a second cover that covers a back surface of the surface of the processing target member, and the transport line includes the first cover. The fluid recovery device according to claim 11, wherein the fluid recovery device is connected to a cover and the second cover. A recovery step of recovering a fluid containing a cutting material sprayed on a member to be processed,
A cleaning step of decontaminating the cutting material contained in the recovered fluid;
A method for recovering a fluid, comprising:   A water jet processing apparatus having the fluid recovery device according to claim 1.

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