JP5394337B2 - Residual radioactive sludge liquid suction device - Google Patents

Description

  The present invention relates to a residual radioactive sludge liquid suction device, and in particular, when transferring a small amount of radioactive sludge liquid remaining in a sludge storage tank contaminated with radioactive substances to another tank, there is no risk of exposure to the sludge safely and reliably. The present invention relates to a residual radioactive sludge liquid suction device capable of sucking radioactive sludge liquid in a storage tank.

  Radioactive sludge contaminated with radioactive materials (hereinafter simply referred to as sludge), which consists of ion exchange resins and filter aids generated during the operation of nuclear power plants, is clarified for a certain period of time due to radioactive attenuation. It is stored together with water in a sludge storage tank, and then extracted from the sludge storage tank and transferred to a processing step for processing.

  Supernatant water is generated for the following reasons. When the sludge is transferred to the sludge storage tank, since it is impossible to transfer the sludge alone, it is necessary to mix it with water or the like to obtain a fluidized sludge liquid. When the sludge liquid thus formed is conveyed to a sludge storage tank, the sludge settles and supernatant water is generated on the sludge.

  Since such a sludge storage tank is required to have high reliability, it is necessary to periodically inspect and repair the sludge storage tank as necessary. In order to inspect the tank, it is necessary to empty the sludge storage tank. For this purpose, it is necessary to transfer the sludge stored in the sludge storage tank to another tank, and it is essential to carry out this transfer operation while minimizing the exposure of the worker to radiation.

  An example of a radioactive sludge transfer device proposed to solve this problem is disclosed in Patent Document 1 (Japanese Patent No. 4356728). Hereinafter, this radioactive sludge transfer device is referred to as a conventional transfer device and will be described with reference to the drawings.

  FIG. 7 is a schematic configuration diagram showing a conventional transfer device.

  In FIG. 7, T1 is a sludge storage tank in which the sludge 31 is stored, T2 is a transfer tank to which the sludge 31 stored in the sludge storage tank T1 is transferred, 32 is the supernatant water of the sludge 31, and 33 is air. It is a blowing device, and includes an air supply source 34, an air pipe 35 and an air nozzle 36. The air blowing device 33 blows air into the supernatant water 32 of the sludge 31 stored in the sludge storage tank T1, and locally agitate the supernatant water 32, thereby forming a sludge liquid 37 having fluidity.

  P1 is a sludge transfer pump in the sludge storage tank T1, P2 is a supernatant water return pump in the transfer tank T2, 38 is a sludge liquid transfer path that is connected to the sludge transfer pump P1 and reaches the transfer tank T2, and 39 A supernatant water transfer path 40 connected to the supernatant water return pump P2 is a supernatant water jetting apparatus connected to the supernatant water transfer path 39. The supernatant water ejection device 40 converts the supernatant water 32 from the supernatant water transfer path 39 as a high-pressure water jet from the supernatant water ejection nozzle 42 attached to the supernatant water pipe 41 toward the sludge 31 stored in the sludge storage tank T1. Spray.

  The air pipe 35, the sludge liquid transfer path 38, the supernatant water transfer path 39 and the supernatant water pipe 41 are all inserted into the sludge storage tank T1 or the transfer tank T2 from the inspection hole 43 shielded by the radiation shielding means 44. Yes.

  45 is a monitoring camera installed in the sludge storage tank T1, and monitors the formation state of the sludge liquid 37 in the sludge storage tank T1. A monitoring camera 46 is installed in the transfer tank T2, and monitors the formation state of the supernatant water 32 in the transfer tank T2. 47 is a control device based on the video information from the monitoring cameras 45 and 46, and the valve B1 attached to the air blowing device 33, the supernatant water jetting device 40, the sludge liquid transfer path 38 and the supernatant water transfer path 39. A series of operations for transferring the sludge 31 is controlled by operating B4 and the like.

  According to the conventional transfer apparatus configured as described above, the sludge 31 stored in the sludge storage tank T1 is transferred into the transfer tank T2 as follows.

  First, air is blown into the supernatant water in the sludge storage tank T1 by the air blowing device 33, and the supernatant water is locally stirred. Thereby, the sludge 31 stored in the sludge storage tank T <b> 1 is pulverized, and a sludge liquid 37 having fluidity is formed on the sludge 31.

  When the sludge liquid 37 is thus formed, the sludge liquid 37 is sucked by the sludge transfer pump P1 and transferred to the transfer tank T2 through the sludge liquid transfer path 38. The sludge liquid 37 in the transfer tank T2 is separated into the sludge 31 and the supernatant water 32 over time.

  In this way, when the supernatant water 32 is accumulated in the transfer tank T2, the supernatant water 32 is sucked by the supernatant water return pump P2 and transferred to the supernatant water jetting device 40 through the supernatant water transfer path 39. The supernatant water ejection device 40 sprays the supernatant water 32 through the supernatant water pipe 41 from the supernatant water ejection nozzle 42 to the sludge 31 stored in the sludge storage tank T1. As a result, the sludge 31 is pulverized to form a sludge liquid 37.

  Thereafter, the sludge liquid 37 is again sucked by the sludge transfer pump P1 and transferred to the transfer tank T2 through the sludge liquid transfer path 38, and the supernatant water 32 in the transfer tank T2 is stored in the sludge storage tank T1. 31 is sprayed.

  By repeatedly performing the above operation, the sludge 31 stored in the sludge storage tank T1 can be transferred to the transfer tank T2.

Japanese Patent No. 4356728

As described above, the conventional transfer apparatus provides the following advantages.
(1) Since a series of operations for transferring the sludge 31 is performed by remote control by the control device 47 based on video information from the monitoring cameras 45 and 46, it is possible to minimize exposure of workers due to radiation. it can.
(2) When the sludge 31 is pulverized by the high-pressure water jet, the sludge 31 can be reliably pulverized. The first pulverization of the sludge 31 is performed by blowing air.
(3) Since the supernatant water 32 originally stored in the sludge storage tank T1 is used as the high-pressure water used for pulverizing the sludge 31, the amount of radioactive waste does not increase. When water from the outside is used, the amount of radioactive waste increases accordingly.

  However, the conventional transfer device has the following problems.

  According to the conventional transfer device, most of the sludge 31 stored in the sludge storage tank T1 can be transferred to the transfer tank T2 as described above. However, due to the performance of the sludge transfer pump P1, the sludge storage tank is unavoidable. A small amount of sludge liquid 37 remains at T1.

  Conventionally, this residual sludge has been transferred manually, and there has been a risk of exposure.

  Accordingly, an object of the present invention is to provide a sludge storage tank that can be safely and reliably exposed to a remote operation without fear of exposure when transferring a small amount of sludge liquid remaining in the sludge storage tank to another tank. It is an object of the present invention to provide a residual radioactive sludge liquid suction device that can suck residual sludge liquid.

  The present invention has been made to achieve the above object, and is characterized by the following.

[1] A residual radioactive sludge liquid suction device for sucking the residual sludge liquid when transferring the residual sludge liquid in one tank to the other tank, the suction device main body, and the suction device main body A plurality of attached buoyancy bodies, a suction head attached to the suction device main body for sucking the residual sludge liquid, an air injection nozzle attached to the buoyancy body, and supplying air to the air injection nozzle The buoyancy body includes a ring-shaped air tube and a buoyancy member provided in a space surrounded by the air tube, and the suction device body includes the buoyancy body. The residual sludge is floated on the liquid surface of the residual sludge liquid by buoyancy, and air from the air supply source is jetted from the air jet nozzle, whereby the residual sludge is jetted. In which it characterized in that the upper liquid level of the liquid is movable.

[2] The residual radioactive sludge liquid suction device described in [1] is characterized in that the buoyancy member is made of foamed polystyrene .

[3] In the residual radioactive sludge liquid suction device described in [1] or [2], the suction head is characterized in that it can move up and down .

[4] In the residual radioactive sludge liquid suction device according to any one of [1] to [3], the buoyancy body is disposed at each vertex of a polygon, and the suction head includes at least three suction heads. It is characterized by being surrounded by the buoyancy body.

  According to the present invention, when a small amount of sludge liquid remaining in the sludge storage tank is transferred to another tank, the radioactive sludge liquid in the sludge storage tank can be sucked safely and securely without fear of exposure.

It is the schematic which shows the state which is attracting | sucking the sludge liquid of a sludge storage tank with the residual radioactive sludge liquid suction apparatus of this invention. It is a top view which shows the residual radioactive sludge liquid suction device of this invention. It is a front view which shows the residual radioactive sludge liquid suction device of this invention. It is sectional drawing which shows the buoyancy body of the residual radioactive sludge liquid suction device of this invention. It is a front view which shows the state which is attracting | sucking sludge liquid with the residual radioactive sludge liquid suction device of this invention. It is a front view which shows the state which descends the suction head of the residual radioactive sludge liquid suction device of this invention to the bottom part of a sludge storage tank, and is attracting | sucking sludge liquid. It is a schematic block diagram which shows a conventional transfer apparatus.

  One embodiment of the residual radioactive sludge liquid suction device of the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic view showing a state in which sludge liquid in a sludge storage tank is sucked by the residual radioactive sludge liquid suction device of the present invention. FIG. 2 is a plan view showing the residual radioactive sludge liquid suction device of the present invention. 3 is a front view showing a residual radioactive sludge liquid suction device of the present invention, and FIG. 4 is a cross-sectional view showing a buoyancy body of the residual radioactive sludge liquid suction device of the present invention.

  1 to 4, T1 is a sludge storage tank as one tank. In the sludge storage tank T1, a small amount of sludge liquid (L) remains after the sludge is transferred by the conventional transfer device, for example, from the sludge storage tank T1 to a transfer tank (not shown) as the other tank. ing. Here, the residual sludge liquid (L) includes only the residual supernatant water on the sludge (see FIG. 7).

  Reference numeral 1 denotes a suction device main body, and reference numeral 2 denotes a plurality of buoyancy bodies attached horizontally to the suction device main body 1. In this example, one buoyancy body 2 is arranged at each vertex of the triangle, but it may be arranged at each vertex of a polygon other than the triangle.

  As shown in FIG. 4, the buoyancy body 2 is formed by a ring-shaped rubber tube 3 into which air is injected, a closing plate 4 that closes the upper opening of the rubber tube 3, and the rubber tube 3 and the closing plate 4. A plug 5 to which an air tube 6 is connected is attached to the closing plate 4. The buoyancy member 7 is made of styrene foam or the like placed in the space (S). Air is supplied to the space (S) from an air supply source (not shown) installed outside the sludge storage tank T <b> 1 via the air tube 6. The air supplied to the space (S) passes through the gap between the rubber tube 3 and the buoyancy member 7 and is released as an air bubble from the lower part of the buoyancy body 2, thereby adjusting the balance of the suction device body 1. Can be done.

  Reference numeral 8 denotes a suction head that sucks the residual sludge liquid (L), and is attached to the suction device main body 1 so as to be surrounded by three buoyancy bodies 2 arranged at the apex of the triangle. The suction head 8 is connected through a suction pipe 10 to a suction pump 9 suspended in the sludge storage tank T1. The residual sludge liquid (L) sucked by the suction pump 9 is transferred to the transfer tank described above via the transfer pipe 11. The suction head 8 can be moved up and down with respect to the suction device body 1 by a cylinder 12 in order to adjust the suction height. The cylinder 12 is remotely operated by air supplied from the air supply source. If the suction head 8 is lowered by the cylinder 12 until it comes into contact with the bottom of the sludge storage tank T1, the suction position by the suction device body 1 can be fixed.

  Reference numeral 13 denotes an air injection nozzle attached to the buoyancy body 2. The air injection nozzles 13 are each independently connected to the air supply source via an air tube 14. By supplying air to the air injection nozzle 13 in a state where the suction device body 1 is floated, the suction device body 1 freely moves on the residual sludge liquid (L). For example, as shown in FIG. 2, when air is supplied to the air injection nozzles 13 attached to the two buoyancy bodies 2 (lower part in the figure) and the air is injected in the direction A in the figure, the suction device body 1 Advances in the direction B in the figure. The supply of air to the air injection nozzle 13 is remotely controlled.

  According to the residual radioactive sludge liquid suction device of the present invention configured as described above, the residual sludge liquid (L) in the sludge storage tank T1 is sucked and transferred to a transfer tank (not shown) as follows. Transported in.

  As shown in FIG. 1, the suction pump 9 is suspended in the sludge storage tank T1, and the residual radioactive sludge liquid suction device of the present invention is lowered onto the level of the residual sludge liquid (L). The suction head 8 and the suction pump 9 are connected by a suction pipe 10, and the suction pump 9 and the transfer tank are connected by a transfer pipe 11.

  As shown in FIG. 5, the suction pump 9 is operated in a state where the residual radioactive sludge liquid suction device floats on the liquid surface of the residual sludge liquid (L) by the buoyancy body 2. Thereby, residual sludge liquid (L) is sucked. The sucked residual sludge liquid (L) is transferred to the transfer tank through the transfer pipe 11.

  When changing the suction location of the residual sludge liquid (L), air is jetted from a desired air jet nozzle 13. Thereby, the residual radioactive sludge liquid suction device can be moved to an arbitrary place. The reason why the residual radioactive sludge liquid suction device needs to be moved is that the concentration is high and suction of all the residual sludge liquid (L) may not be smoothly performed by suction at only one place.

  After moving to the desired location, the suction pump 9 is operated to suck the residual sludge liquid (L) in the same manner as described above.

  When the residual sludge liquid (L) is sucked at a fixed position with the liquid level of the residual sludge liquid (L) lowered, as shown in FIG. 6, the cylinder 12 is actuated so that the suction head 8 is sludge. Lower until it hits the bottom of the storage tank T1. As a result, the position of the suction device main body 1 is fixed, so that the residual sludge liquid (L) can be sucked at a fixed position.

  All of the above operations are performed by remote control.

  According to the residual radioactive sludge liquid suction device of the present invention, the residual sludge liquid (L) in the sludge storage tank T1 is sucked as described above, and it is safe without exposure to the transfer tank (not shown). And reliably transferred.

1: Suction device body 2: Buoyant body 3: Rubber tube 4: Blocking plate 5: Plug 6: Air tube 7: Buoyancy member 8: Suction head 9: Suction pump 10: Suction pipe 11: Transfer pipe 12: Cylinder 13: Air Spray nozzle 14: Air tube 31: Sludge 32: Supernatant water 33: Air blowing device 34: Air supply source 35: Air pipe 36: Air nozzle 37: Sludge liquid 38: Sludge liquid transfer path 39: Supernatant water transfer path 40: Supernatant Water ejection device 41: Supernatant water pipe 42: Supernatant water ejection nozzle 43: Inspection hole 44: Radiation shielding means 45: Monitoring camera 46: Monitoring camera 47: Control device

Claims (4)

A residual radioactive sludge liquid suction device for sucking the residual sludge liquid when transferring the residual sludge liquid in one tank to the other tank,
A suction device body, a plurality of buoyancy bodies attached to the suction device body, a suction head attached to the suction device body for sucking the residual sludge liquid, and an air injection nozzle attached to the buoyancy body And an air supply source for supplying air to the air injection nozzle, and the buoyancy body includes a ring-shaped air tube and a buoyancy member provided in a space surrounded by the air tube, The suction device main body floats on the liquid surface of the residual sludge liquid by the buoyancy of the buoyant body, and ejects air from the air supply source from the air injection nozzle, whereby the liquid of the residual sludge liquid A residual radioactive sludge liquid suction device characterized by being movable on a surface. The residual radioactive sludge liquid suction device according to claim 1, wherein the buoyancy member is made of expanded polystyrene . The residual radioactive sludge liquid suction device according to claim 1 , wherein the suction head is movable up and down . The buoyancy body is disposed at each vertex of a polygon, and the suction head is surrounded by at least three buoyancy bodies. Residual radioactive sludge liquid suction device.

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