JP2856447B2 - Cutting and disposal equipment for hollow fiber modules - Google Patents

Description

The present invention relates to an apparatus for cutting and discarding a hollow fiber module contaminated with a radioactive substance.

[Problems to be solved by conventional technology and invention]

In a hollow fiber filtration membrane filter device that filters and removes fine solids in wastewater using a large number of hollow fiber filtration membranes, a hollow fiber module in which a large number of hollow fiber filtration membranes are bundled in a vertical shape is vertically installed in the device. It is used by filling many in the direction.

This device has an external pressure type in which the liquid flows from the outside of the hollow fiber filtration membrane to the inside, and an internal pressure type in which the liquid flows from the inside of the filtration membrane to the outside. The fine solids are removed by the membrane, which causes filtration resistance and increases the differential pressure of the filtration device.

The filtration device with an increased differential pressure is usually reused by stopping water flow and washing with water or air, etc., but sometimes using chemicals to deposit or clog the membrane. In some cases, chemical cleaning to dissolve the substance is performed.

On the other hand, when 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 replace the hollow fiber module when it becomes unusable due to deterioration in strength. Need to be
With such replacement of the hollow fiber module, it becomes necessary to dispose of the used hollow fiber module.

In particular, hollow fiber modules used for wastewater treatment in nuclear power plants cannot be disposed of as general industrial waste because they are contaminated with radioactive materials.Solid waste treatment facilities specially managed in power plants Is disposed of. When disposing of the hollow fiber module in a nuclear power plant in this way, it is optional to either fill and store it in a drum for waste, or in the case of combustible materials, incinerate it in an incinerator. Is done.

The size of the hollow fiber module used in the above-mentioned nuclear power plant is generally 80 to 160 mm in diameter and about 1 to 2 in length.
m, and the size of the waste drum used in nuclear power plants for the size of this hollow fiber module is
For ^{567 i φ × 830 i H (} JIS Z1600H species) can not be directly hollow fiber discarding Store the module small, the need to shred a hollow fiber module to a size that can be filled into drums. When incinerated in an incinerator, the size and weight of the incinerator are limited due to the capacity and size of the incinerator.In general, domestic power plants have a length of 30 cm or less and a weight of 2-3 kg / piece. It is. In addition, it is necessary to put the incinerated material in a plastic bag of polyethylene or the like from the viewpoint of handling when putting it in the incinerator.

In addition, hollow fiber modules used for wastewater treatment of condensate purification equipment at nuclear power plants have a purification capacity of that equipment.
Since it is as large as 3,000 to 7,000 m ³ / H, the number of bundles of modules used is very large, from several hundred to several thousand bundles. For this reason, the amount of the used hollow fiber module generated by the replacement of the hollow fiber module is inevitably increased, and it is necessary to safely and reliably perform the efficient cutting and disposal work.

Therefore, as a conventional hollow fiber module cutting and discarding device, for example, there has been the following device.

That is, the hollow fiber modules in the filtration device are used in a state of being packed and arranged in a bundle in the vertical and vertical direction.When the hollow fiber modules are taken out from the filtration device, the hollow fiber modules are removed from the filtration device by a crane or a monorail hoist. Each bundle is pulled out in a suspended state. Next, this hollow fiber module is transported to the cutting and disposal device directly in the suspended state, or once suspended in the intermediate storage tank and suspended again by a crane or the like, where the module holding mechanism and the module cutting mechanism operate. These are cut to the required length and then packaged (see JP-A-63-26).
No. 2598).

However, in the case of the above-mentioned conventional cutting and discarding device, when supplying the vertically suspended hollow fiber module to the cutting and discarding device, the module is lowered and supplied from the insertion port at the upper end of the device. Therefore, the height of the building where the crane etc. is installed becomes considerably high, and when the suspended hollow fiber module is transported from the filtration device and positioned at the insertion port of the cutting and disposal device, the module will shake and the work will be extremely difficult. It was difficult and the work efficiency was poor.

[Means for solving the problem]

The present invention has been made in view of the above and, as a result of various studies, has developed a hollow fiber module cutting and discarding device which can sufficiently respond to the above requirements.

That is, the present invention relates to an apparatus for cutting and discarding a hollow fiber module in which a large number of hollow fiber filtration membranes for passing and filtering wastewater containing a radioactive substance are filtered, and the hollow fiber taken out of the filtration apparatus and suspended vertically. A conveying and feeding device that supplies the module from a horizontal direction to a module holding device that holds the hollow fiber module in a vertical state, an elevating device that lowers the hollow fiber module held in the vertical direction by a cutting length,
A cutting device for cutting a hollow fiber module descending below a hollow fiber module held in a longitudinal direction, and a packaging device for automatically sealing and packaging the cut hollow fiber module cut pieces for each cut piece. It is a feature.

[Action]

As described above, the hollow fiber module cutting and disposal apparatus of the present invention can safely and reliably cut, bag, and take out the hollow fiber module contaminated with the radioactive substance that has been taken out of the filtration apparatus and conveyed to this disposal apparatus. In addition, it is configured such that these operations can be automatically and efficiently performed.

The disposal device supplies a module to be processed from a lateral direction. Therefore, as compared with the conventional method of supplying the module from the upper end of the apparatus, there is an advantage that the height of the building where the crane or the like is installed is low and the supply of the module to the apparatus is easily positioned.

Furthermore, conventionally, when cutting a module, the module suspended by the hoist device must be lowered by a fixed amount, and each time the module holding device in the cutting and disposal device must be released at the same time, the configuration of the entire device is complicated. Met. However, according to the cutting and discarding device of the present invention, the hoist device is a simple operation of transporting the hollow fiber module and supplying it to the discarding device, and cutting and sending to the cutting device are performed independently in the discarding device. Therefore, it has a feature that the configuration is simple and the cutting operation can be performed smoothly.

Further, in the present invention, the cut module cut pieces are placed in separate plastic bags or the like and sealed one by one.
Handling during filling and incineration of drums becomes easy.

Then, it was confirmed that the automatic packaging machine generally used as an industrial machine can be applied to such module packaging, so that these were combined as a single device to exert the above-mentioned effects. As such an automatic packaging machine, any type can be used as long as it can automatically and individually seal the cut pieces, and cut module cut pieces are placed in a bag prepared one by one. There are a type in which the spout is allowed to fall naturally and the outlet is sealed, and a type in which a bag is prepared in advance on a turntable and cut pieces are dropped into the bag while rotating the table.

Although the cutting device is not particularly limited,
For example, if it is carried out with a round cono, etc., swarf, which is radioactive waste, will be generated, and if it scatters, it is a safety problem. With a cutter using air pressure, no chips are generated, so that the structure of the device is simple and safe.

〔Example〕

 An embodiment of the present invention will be described below.

Remove the upper end plate of a filtration tower (not shown) in which a large number of hollow fiber modules are inserted, take out the hollow fiber modules one by one with a crane or the like, and at this time, use a packaging bag of elongate polyethylene or the like in advance. Then, the hollow fiber modules are packaged one by one. Next, the hollow fiber module is relayed as it is or after relaying to a relay tank (not shown) having an open top, and as shown in FIGS. 1)
Is suspended by a transport / supply device such as a crane and moved to the side of the cutting / disposing device (12). Then, the module (1) is supplied from the lateral direction to the module support clamp (2) of the cutting and discarding device (12) while the module (1) is suspended in the vertical direction. After that, the module (1) whose upper end is held is cut into a predetermined cutting length by a clamp elevating device (3) that moves the support clamp (2) up and down along the column (13) as shown in FIG. And the lower end thereof is inserted into the hydraulic cutter (4).

The module cut pieces cut by the hydraulic cutter (4) as shown in FIG. 2 (b) and dropped on the hopper (5) are further lowered below the hopper (5) by the bag supply device (6) shown below. Available polyethylene bags (7)
Is dropped and stored.

That is, as shown in FIGS. 6 and 7, in the vicinity of the hopper (5), a bag supply device (6) comprising a cylinder (15) rotatably attached to the rear end and having a vacuum suction cup (14) at the tip of the piston portion. ) Is provided, and the opening side of the stacked polybags (7) is sucked one by one by the suction cup (14) and supplied to the lower part of the hopper (5). Next supplied plastic bag (7)
Both ends of the opening at the upper end are held down by the clamping clamps (16) of the holding device (8), and at the same time, the center of the opening at the upper end of the plastic bag (7) is placed at the tip with the vacuum suction cups (14) installed on both sides thereof. The sucker (14) of the opening cylinder (17) has a suction port to open the mouth, and waits for the cut piece to fall from the hopper (5).

Thereafter, the plastic bag (7) containing the module cut to a predetermined length is held at its upper end by a clamping clamp (16) as shown in FIGS. While being held, the holding device is horizontally moved to the position of the sealing device (10) above the discharge chute (18) by the driving device (9) for horizontally moving the holding device.

Then, as shown in FIG. 3 (b), the clamping clamp (16)
The upper end of the plastic bag (7) is sealed by a sealing device (10) set below the plastic bag (7), and the plastic bag (7) is released from the holding device (8) as shown in FIG. 18) Drops on and is then collected in storage container (11).

The operation of cutting the module (1) to a predetermined length while lowering the module support clamp (2) in this manner is repeated to the top end of the module (1) as shown in FIG. The process ends.
The uppermost end of the module (1) is dropped and stored in the plastic bag (7) by releasing the module support clamp (2).

〔The invention's effect〕

As described above, according to the present invention, after the hollow fiber module contaminated with radioactivity is taken out of the filtration device, a series of operations from transport to supply to the cutting / disposing device, cutting, sealing of the bag-sealing, and disposal are automated. It is possible to reduce the radiation exposure of the worker and to achieve a remarkable effect such as a reduction in the working time. In the case where the hollow fiber module to be cut is wrapped in a long and thin packaging bag made of polyethylene or the like and cut in the same manner as in the above embodiment, when the hollow fiber module is transferred to the cutting and disposing device, the radioactive substance is not transferred to the device. Since the radioactive material is not scattered around and the radioactive material is not scattered around the device when cutting this module with the cutting and disposal device, there is no need to make the cutting and disposal device itself a particularly sealed structure. Great structural advantage.

[Brief description of the drawings]

1 to 7 show a series of movements of an embodiment of the apparatus of the present invention. FIG. 1 (a) is a front view showing a state of supplying a module to the apparatus, and FIG. 1 (b) is the same. FIG. 2 (a) is a front view showing a state in which the module is inserted into the hydraulic cutter, FIG. 2 (b) is a sectional side view of an essential part showing how the module is cut, and FIG. 3 (a) is a plan view. FIG. 3 (b) is a side view of a main part showing a state in which the upper end portion of the plastic bag is sealed, and FIG. 4 is a front view showing a state where the module cut pieces are put in the plastic bag. FIG. 5 is a front view showing the final stage of cutting one module, FIG. 6 (a) is a side view for explaining the operation of the bag feeding device, and FIG. FIG. 7 (a) is a side view showing a state in which the mouth of the upper end of the plastic bag is opened, showing the holding mechanism of the upper end of the plastic bag and the opening mechanism. FIG, 7 (b) Figure 7 is (A)
FIG. DESCRIPTION OF SYMBOLS 1 ... Hollow fiber module 2 ... Module support clamp 3 ... Clamp elevating device 4 ... Hydraulic cutter 5 ... Hopper 6 ... Bag supply device 7 ... Polybag 8 ... Holding device 9 ... Drive device 10 ... … Sealing device 11… Storage container 12… Cutting and disposal device 13… Support 14… Vacuum suction cup 15… Cylinder 16… Clamping clamp 17… Opening cylinder 18… Discharge chute

Continuation of the front page (56) References JP-A-1-304399 (JP, A) JP-A-2-131899 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) G21F 9 / 30

Claims (1)

(57) [Claims] An apparatus for cutting and discarding a hollow fiber module in which a large number of hollow fiber filtration membranes for bundling and filtering wastewater containing radioactive substances are taken out of the filtration apparatus and suspended vertically. A conveying and feeding device for supplying the module from the horizontal direction to a module holding device for holding the hollow fiber module in a vertical state, an elevating device for lowering the hollow fiber module held in the vertical direction by a cutting length, It is characterized by comprising a cutting device for cutting the hollow fiber module descending below the held hollow fiber module, and a packaging device for automatically sealing and packaging the cut hollow fiber module cut pieces for each cut piece. Cutting and disposal equipment for hollow fiber modules.