JPH0550398A - Cutting and disposing apparatus for hollow fiber module - Google Patents

Abstract

PURPOSE:To provide an apparatus to cut a hollow fiber module, which passes and filters radioactive waste water, safely and certainly, and to seal it in a packaging bag. CONSTITUTION:This is a cutting and disposing apparatus for a hollow fiber module, consisting of a clamp 1 which holds the hollow fiber module longitudinally, a lift 3 which lowers the module by a cut length, a cutting device 2 which cuts the lowered module from its lowest part successively and a packaging device which seals the cut and dropped pieces one by one automatically into a packaging bag, and in this cutting and discarding apparatus, a shutter 5 to once catch the dropping cut pieces is provided below the cutting device, a guide 6 to guide the cut pieces into the packaging bag is provided below the shutter, a bag pedestal 12 to support the bottom of the packaging bag from below when the cut pieces drop into the packaging bag is provided and moreover lateral size of the lower part of the packaging bag to receive the cut pieces is formed small in compliance with the size of the cut pieces to be received.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for cutting and discarding a hollow fiber module contaminated with radioactive substances.

[0002]

2. Description of the Related Art In a hollow fiber filtration membrane filter device for filtering and removing fine solids contained in waste water using a large number of hollow fiber filtration membranes, the hollow fiber filtration membranes have a vertical shape. A large number of bundled hollow fiber modules are used by being filled in the apparatus in the vertical direction. This device has an external pressure type in which liquid is passed from the outside of the hollow fiber filtration membrane to its inside, and an internal pressure type in which liquid is passed from the inside of the filtration membrane to its outside,
In both cases, fine solids in the waste water for use are removed by the membrane by filtration, which causes filtration resistance to increase the differential pressure of the filtration device. The filtration device with such an increased differential pressure is usually reused after stopping water flow and washing with water or air, but sometimes using chemicals to attach or clogging the membrane. Chemical cleaning to dissolve the substance may be carried out.

On the other hand, if the pressure difference does not become sufficiently small even after the above washing, it is necessary to stop the reuse and replace the hollow fiber module with a new one, or if the strength becomes deteriorated and it becomes unusable. However, it is necessary to dispose of the used hollow fiber module as a result of such replacement of the hollow fiber module.

In particular, since the hollow fiber module used for the treatment of wastewater in a nuclear power plant is contaminated with radioactive substances, it cannot be disposed of as general industrial waste and is a solid waste specially managed in the power plant. Disposal is done at the material processing facility. When disposing of the hollow fiber module in the nuclear power plant in this way, either fill the drum drum for waste and store it, or if it is a flammable material, incinerate it in an incinerator. To be done.

The hollow fiber module used in the above nuclear power plant generally has a size of 80 to 160 mmφ,
The length is about 1-2 m. And the size of this hollow fiber module is 567iφ × 830iH (JIS Z1600 H
It is too small to put in a hollow fiber module and discard or store it. Therefore, it is necessary to cut the hollow fiber module into pieces that can be filled in a drum. Also, when incinerating in an incinerator, the capacity of the incinerator,
There are limits to the size and weight of incinerated materials due to size, etc., and the length of a power plant in Japan is generally 30 cm or less and the weight is 2-3 kg / piece. In addition, it is necessary to put the incinerator in a plastic bag such as polyethylene when it is put into the incinerator for convenience of handling.

Further, the hollow fiber module used for the wastewater treatment of the condensate purification equipment of a nuclear power plant has a large purification capacity of 3,000 to 7,000 m3 / H, so that the number of modules to be used is also large. There are hundreds to thousands of bundles. For this reason, the amount of used hollow fiber modules which is inevitably generated when the hollow fiber modules are renewed is increased, and it is necessary to carry out a more efficient cutting and disposal operation safely and surely.

[0007] As a cutting and discarding device for such a hollow fiber module, there have been conventionally the following devices. That is, since the hollow fiber modules in the filtration device are packed and arranged in a bundle in the vertical vertical direction, when taking out the hollow fiber modules from the filtration device, the hollow fiber modules are suspended from the filtration device by a crane or a monorail hoist. Pull out one bundle at a time. Next, this hollow fiber module is conveyed to the cutting and discarding device directly in the suspended state, or after being temporarily stored in an intermediate storage tank and then suspended again by a crane or the like, where it is conveyed by a module holding mechanism and a module cutting mechanism. It is cut to the required length and then packaged (see Japanese Patent Laid-Open No. 63-262598).

However, in the case of the above-mentioned conventional cutting and discarding device, when the hollow fiber module suspended in the longitudinal direction is supplied to the cutting and discarding device, the module is lowered from the insertion port at the upper end of the device to be fed. Therefore, the height of the building where the crane is installed must be considerably high, and the suspended hollow fiber module is shaken by the module when it is transported from the filtration device and positioned at the insertion port of the cutting and discarding device. Etc., it was very difficult to work and the work efficiency was poor.

Therefore, the inventors of the present invention have proposed a cutting and discarding device that solves the drawbacks of the conventional device in Japanese Patent Laid-Open No. 3-73900. That is, the hollow fiber module taken out from the filtration device and hung in the vertical direction is fed horizontally to the module holding device while being held in the vertical direction, and the hollow fiber module held in the vertical direction is lowered by the cutting length. It consists of an elevating device for clamping, a cutting device for sequentially cutting the lowered hollow fiber module from its lower end to a predetermined length, and a packaging device for automatically sealing and packaging the cut pieces of the cut module. It is a thing.

However, in the above-mentioned improved device, there are problems that the cut pieces of the hollow fiber module are not accurately stored in the packaging bag, and the falling of the cut pieces damages the packaging bag. There is also a problem that the later handling is inconvenient because the pieces are stored and sealed in the packaging bag in an arbitrary state.

[0011]

As a result of various studies in view of the above problems, the present invention has developed a cutting and discarding device for hollow fiber modules, which further solves these problems. That is, one of the present invention is characterized in that, in the above cutting and discarding device, a shutter for once receiving a falling module cutting piece is provided below the cutting device, and another one of the present invention is cutting. It is characterized in that a guide for guiding the module cut piece into the packaging bag is provided below the device, and yet another one of the present invention is, when the module cut piece falls into the packaging bag. According to another aspect of the present invention, there is provided a bag pedestal for supporting a bottom portion of the packaging bag from below. It is characterized in that it is formed small according to the size of the cut pieces to be stored. Yet another aspect of the present invention is characterized by having all of the above features.

[0012]

As described above, the provision of the shutter for temporarily receiving the cut pieces below the cutting device is to prevent the cut pieces, particularly the cut hollow fibers in the hollow fiber module, from falling apart. This is because if the hollow fiber module cut pieces cut by the cutting device are dropped all at once into the packaging bag, the packaging bag may be damaged. Further, the reason why the bag receiving base for supporting the bottom portion of the packaging bag from below is provided is also for mitigating the impact of dropping the cut piece on the bag.

Further, the reason why the guide for the cutting pieces is provided below the cutting device is to ensure that the cutting pieces are dropped and stored in the packaging bag. The above guide is preferably cylindrical, and the guide itself can be moved up and down to more reliably drop the cut piece into the packaging bag, and the lower end of the guide is inserted into the opening of the packaging bag when the cut piece falls. It should be possible to do it.

A packaging bag whose lateral size at the lower portion is made smaller in accordance with the size of the cut pieces to be accommodated is used by cutting the upper opening of the bag as usual. This is because the piece surely falls into the bag and the lower part of the bag is made smaller according to the size of the cut piece, so that the cut piece can be stored and sealed in a constant state at all times.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A cutting and discarding device according to an embodiment of the present invention will be described below. A module support clamp for holding a long hollow fiber module vertically as shown in FIGS.
A hydraulic cutter (2) having (1) on the upper part and cutting the hollow fiber module to a predetermined length was provided below the (1).

Here, the cut length of the module is the above-mentioned clamp holding the module by the clamp lifting device (3).
The step (1) is lowered along the support column (17) by a predetermined length. However, since the descending distance of the clamp (1) can be set in advance, the cutting length of the module can be freely changed. Therefore, it is a structure that can sufficiently cope with the weight limitation of the incineration equipment of the module.

A hopper (4) is provided below the cutter (2) for receiving the cut pieces of the hollow fiber module, and below the cutter (2), the cut pieces do not suddenly drop to the lowest position. A shutter (5) for once receiving the cut piece was installed. Further, below the shutter (5), a guide tube (6) for surely accommodating the cut pieces in a plastic bag which is the following packaging bag when the shutter (5) is opened.
Was established.

It is desirable that the shutter (5) has a structure that opens as quickly as possible, and it is preferable that it be driven by an air cylinder. As for the shutter type, there is a simple flat plate that moves left and right to open and close, and there is also a double door open type, but in any other type, the point is to keep the shutter closed. It is only required that the hollow fiber module cutting piece that is falling can be received once and the cutting piece can be quickly dropped when it is opened instantly.

The guide tube (6) is a truncated cone tube having a mouth with a large upper end and a mouth with a small lower end as shown in the figure. The mouth of the guide tube is inserted into the mouth of the plastic bag supplied directly below, and after the cut piece falls from the shutter and the cut piece is stored in the plastic bag, the guide tube (6) moves upward. The lower end of the lever is configured to be pulled out from the mouth of the plastic bag. The guide tube (6) may not move vertically. Further, the same effect as this can be obtained by moving the plastic bag up and down without moving the guide cylinder.

Immediately below the guide tube (6), a poly bag (8) supplied by the bag feeding device (7) described below is installed in the guide tube (6).
It has a holding clamp (9) which is held below and a mouth opening cylinder (11) equipped with a vacuum suction cup (10) for opening the mouth of the upper end of the plastic bag (8).

A bag holder (12) for supporting the bottom of the plastic bag (8) when the plastic bag (8) is held by the clamps (9).
Was installed further down. The bag cradle (12) moves up and down, and is installed so as to contact the bottom of the plastic bag after the plastic bag (8) is held by the sandwiching clamp (9).
Bag breakage due to the weight of the cutting pieces dropping when the shutter (5) is opened and directly added to the plastic bag, and the clamping clamp (9)
This structure prevents the plastic bag from falling off. Still further, in order to further improve this effect, a bag holder (12) provided with a damper mechanism may be used.

Further, a bag holding and driving device for laterally moving the poly bag containing the cut pieces held by the holding clamp (9) to a position of a sealing device (14) for heat-sealing the opening of the poly bag. (13) was provided, and further below the sealing device (14), a conveyor (15) for discharging the plastic bag in which the cut pieces were sealed by the sealing device (14) was installed. Reference numeral (16) is an air cylinder that drives the bag holding drive device (13).

The bag supply device (7) further comprises a bag preparation table (18) in which plastic bags (8) are stacked in the same direction, and a vacuum suction cup (10) installed at the lower end of the bag preparation table. It has a bag feeding cylinder (19) having its upper end pivotally supported and swinging toward the cutting and discarding device side at an angle of approximately 90 °.

The operation of the cutting and discarding device for the hollow fiber module constructed as above will be described. Remove the upper end plate of the filtration tower (not shown) in which a large number of hollow fiber modules are inserted, and take out the hollow fiber modules one by one with a crane or the like. The hollow fiber modules are packaged one by one. Next, the hollow fiber module is used as it is or after being relayed to a relay tank (not shown) having an upper opening, as shown in FIG.
As shown in (1), the hollow fiber module (20) previously packaged in a packaging bag of polyethylene or the like is lifted by a transportation and supply device such as a crane and moved to the side of the cutting and discarding device. Then, this module (20) is laterally supplied to the module support clamp (1) of the cutting and discarding device by the carrying and supplying device while being suspended in the vertical direction.

As described above, the module to be processed is supplied to the apparatus of the present invention from the lateral direction. Therefore, compared to the conventional method of supplying modules from above the device,
The height of the building in which the crane or the like is installed is reduced, and the positioning of the supply of the module to the device of the present invention is simplified.

Thereafter, the module (20) whose upper end is held
As shown in Fig. 5, the clamp elevating device (3) that moves the support clamp (1) up and down along the support column (17) lowers it by a predetermined cutting length, and the lower end portion thereof is hydraulic cutter.
(2) and the hopper (4) provided below it so that it is inserted. Then, as shown in FIG. 6, the hydraulic cutter (2) moves the opposing blades back and forth to cut, and the cut pieces are received by the hopper (4).

The cutting device such as a hydraulic cutter used here is not particularly limited, but if it is implemented with a circular saw, for example, chips, which are radioactive waste, are generated, and if this is scattered, it is a safety problem, so It is very complicated because some kind of treatment is required to collect it, but on the other hand, a cutter that uses hydraulic pressure or pneumatic pressure has the advantage that it is safe and the structure of the device is simple because no chips are generated. And in the case of such a cutter, by allowing the blade to move in the lateral direction, it becomes possible to sufficiently follow the deformation of the module to be cut, so that the clamp (1) holding the module is not abnormal. It is possible to prevent an unbalanced load from being applied.

At this time, the plastic bag (8) is supplied by the bag supply device (7).
Is supplied below the cutter so that the cut pieces of the hollow fiber module can be stored in the plastic bag. That is, as shown in FIGS. 7 to 10, first, the bag supply cylinder (19) is lowered, and one plastic bag (8) is lifted from the bag preparation base (18) by the suction cup (10) at the tip, and the cylinder (19 ) By rotating itself to the cutting and discarding device side, the mouth of the plastic bag (8) is
(6) Supply to the position of the clamping clamp (9) directly below. Next, both ends of the mouth of the plastic bag (8) are clamped by the clamping clamps (9) to hold and fix the poly bag (8). At this time, the bottom of the plastic bag (8) is held by the bag support (12). Further plastic bag in this state
The mouth opening cylinders (11) are driven to adsorb the upper central portions of (8) by the respective suction cups (10), and the mouths of the plastic bag (8) are widely opened as shown in FIGS. 9 and 10. At this time, the guide tube
In the case of the structure in which (6) moves up and down, the guide cylinder (6) is lowered and the lower end thereof is inserted into the plastic bag (8).

As shown in FIG. 11, the plastic bag (8) used here is provided with a heat seal (22) in the vertical direction so that the cut pieces (21) are always stored in a vertical state, and Limited storage space in the width direction.

Next, the cut piece of the hollow fiber module dropped into the hopper (4) is the lower shutter as shown in FIG.
You can temporarily stop the fall at (5). Then, when the shutter (5) is opened, the cut piece passes through the inside of the guide tube (6) and further falls into the waiting plastic bag (8) as described above. ..
After that, the plastic bag (8) containing the module cut into a predetermined length holds the upper clamp (9) as shown in Fig. 12.
It is held by the bag holding drive device (13) and laterally moved to the position of the sealing device (14) above the conveyor (15).

Although not shown, the cut piece in the plastic bag (8) is gripped by the gripping mechanism from the outside of the plastic bag so as not to move. Next, as shown in Fig. 13, a clamping clamp
The upper end of the plastic bag (8) is sealed by heat sealing by the sealing device (14) installed below (9), and then the plastic bag (8) is released from the bag holding drive device (13). .. After that, the bag gripping mechanism rotates to move the plastic bag (8) downward and release the gripped state, so that the plastic bag (8) falls onto the conveyor (15) as shown in Fig. 14 and is then stored. Collected in a container (23).

As described above, the hollow fiber module (20) is moved while lowering the module support clamp (1) by a predetermined distance.
By repeating the operation of cutting to a predetermined length up to the uppermost end of the module (20) as shown in FIG. 15, the processing of one hollow fiber module is completed. The cut piece on the uppermost end of the module (20) is dropped in the same manner as described above by simply releasing the module support clamp (1) and is hermetically stored in a plastic bag.

Therefore, conventionally, when the hollow fiber module is cut, the module suspended by the hoist device must be lowered by a fixed amount and the module holding device in the cutting and discarding device must be released at the same time each time. Although the overall configuration is complicated, according to the present invention, the hoist device is merely a simple operation of transporting the module, and the feeding to the cutting device is performed independently in the discarding device. The structure is simple and the cutting work is easy.

As described above, the cutting and discarding device of the present invention is capable of safely and reliably cutting the hollow fiber module that has been taken out from the filtering device and then conveyed to the main cutting and discarding device. Since the above work can be performed automatically and efficiently, and the cut pieces can be put in individual plastic bags and sealed, the handling at the time of subsequent filling into a drum or incineration becomes easy.

[0035]

As described above, according to the present invention, after the hollow fiber module contaminated with radioactivity is taken out from the filtration device, it is transported and supplied to the cutting and discarding device-cutting-bag packing sealing-disposing. It is possible to automate a series of work, reduce the radiation exposure of the worker, and shorten the work time.

Further, in the present invention, the hollow fiber module to be cut is packed in advance in a packaging bag made of elongate polyethylene or the like and cut, so that when the hollow fiber module is transferred to the cutting and discarding device, radioactive substances are not scattered around the device. Moreover, even if this module is cut and dropped by the cutting and discarding device and dropped and stored in the packaging bag, these can be done reliably and safely, so radioactive materials will not be scattered around the device, and Since the cut pieces of the module are stored in the packaging bag in the same state, there is an effect that the subsequent handling is very easy.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of the device of the present invention.

FIG. 2 is a side view of the same.

FIG. 3 is a plan view of the same.

FIG. 4 is an explanatory view showing a state in which a hollow fiber module is supplied to the device of one embodiment of the present invention.

FIG. 5 is an explanatory view showing a state in which a hollow fiber module is installed in the device of one embodiment of the present invention.

FIG. 6 is an explanatory view showing an enlarged main part of a state where the hydraulic cutter of the device of one embodiment of the present invention is operating.

FIG. 7 is an explanatory view showing a state where a plastic bag is being supplied by the device of one embodiment of the present invention.

FIG. 8 is an explanatory view showing an enlarged main part of a state where a plastic bag is being supplied by the device of one embodiment of the present invention.

FIG. 9 is an explanatory view showing a state where the mouth of the plastic bag is opened by the device of one embodiment of the present invention.

FIG. 10 is an explanatory view showing an enlarged main part of the apparatus according to the embodiment of the present invention in a state where the mouth of the plastic bag is opened.

FIG. 11 is a perspective view showing an embodiment of a packaging bag used in the present invention.

FIG. 12 is an explanatory view showing a state where cut pieces are stored in a plastic bag in the device of one embodiment of the present invention.

FIG. 13 is an explanatory view showing a main part of a state in which a plastic bag is sealed by heat sealing in the device of one embodiment of the present invention.

FIG. 14 is an explanatory view showing a state in which a plastic bag in which cut pieces are sealed is put in a storage container by the device of one embodiment of the present invention.

FIG. 15 is an explanatory view showing the final stage of cutting one hollow fiber module by the device of one embodiment of the present invention.

[Explanation of symbols]

 1 Module Support Clamp 2 Hydraulic Cutter 3 Lifting Device 4 Hopper 5 Shutter 6 Guide Tube 7 Bag Feeder 8 Poly Bag 9 Clamping Clamp 10 Vacuum Sucker 11 Open Cylinder 12 Bag Cage 13 Bag Holding Drive 14 Sealing Device 15 Conveyor 16 Air Cylinder 17 Strut 18 Bag preparation stand 19 Bag feeding cylinder 20 Hollow fiber module 21 Cut piece 22 Heat seal 23 Storage container

Claims (5)

[Claims] 1. A module holding device for holding vertically a hollow fiber module having a bundle of a plurality of hollow fiber filtration membranes for passing and filtering a waste water containing a radioactive substance, and a hollow fiber module held vertically. An elevating device that lowers the cut length, a cutting device that sequentially cuts the lowered hollow fiber module from its lower end, and a cut piece of the hollow fiber module that has been cut and dropped is automatically sealed in each packaging bag. In a device for cutting and discarding hollow fiber modules, the device for cutting and discarding hollow fiber modules is provided below the cutting device, and a shutter for once receiving a falling piece of the module is provided. 2. A module holding device for holding vertically a hollow fiber module having a large number of bundles of hollow fiber filtration membranes for passing and filtering a waste water containing a radioactive substance, and a hollow fiber module held vertically. An elevating device that lowers the cutting length, a cutting device that sequentially cuts the lowered hollow fiber module from its lower end, and a cut piece of the hollow fiber module that is cut and dropped is automatically sealed in the packaging bag for each cut piece. In a device for cutting and discarding hollow fiber modules, the device for cutting and discarding hollow fiber modules is provided below the cutting device, and a guide for guiding the cut pieces of the module into the packaging bag is provided. 3. A module holding device for vertically holding a hollow fiber module having a large number of bundles of hollow fiber filtration membranes for passing and filtering a waste water containing a radioactive substance, and a hollow fiber module held vertically. An elevating device that lowers the cutting length, a cutting device that sequentially cuts the lowered hollow fiber module from its lower end, and a cut piece of the hollow fiber module that is cut and dropped is automatically sealed in the packaging bag for each cut piece. In a device for cutting and discarding hollow fiber modules, which comprises a packaging device, a hollow fiber is provided with a bag holder that supports the bottom of the packaging bag from below when the cut pieces of the module fall into the packaging bag. Device for cutting and discarding modules. 4. A module holding device for holding vertically a hollow fiber module having a bundle of a plurality of hollow fiber filtration membranes for passing and filtering a waste water containing a radioactive substance, and a hollow fiber module held vertically. An elevating device that lowers the cut length, a cutting device that sequentially cuts the lowered hollow fiber module from its lower end, and a cut piece of the hollow fiber module that has been cut and dropped is automatically sealed in each packaging bag. In the device for cutting and discarding hollow fiber modules, which comprises a packaging device, the size of the lower part of the packaging bag for storing the module cut pieces in the horizontal direction is made smaller according to the size of the cut pieces to be stored. A device for cutting and discarding hollow fiber modules. 5. A module holding device for holding vertically a hollow fiber module having a large number of bundles of hollow fiber filtration membranes for passing and filtering a waste water containing a radioactive substance, and a hollow fiber module held vertically. An elevating device that lowers the cut length, a cutting device that sequentially cuts the lowered hollow fiber module from its lower end, and a cut piece of the hollow fiber module that has been cut and dropped is automatically sealed in each packaging bag. In a device for cutting and discarding hollow fiber modules, which comprises a packaging device, a shutter for temporarily receiving a falling piece of a module is provided below the cutting device, and a guide for guiding the cutting piece of the module into a packaging bag is provided below the shutter. And, when the module cut piece falls into the packaging bag, a bag pedestal that supports the bottom of the packaging bag from below is provided,
Further, the hollow discarding device of the hollow fiber module is characterized in that the size of the lower portion of the packaging bag for storing the cut pieces of the module is made smaller in accordance with the size of the cut pieces to be stored.