JP3766136B2 - Organic substance removal equipment in radioactive solid waste containing zirconium alloy - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an apparatus for removing organic substances from radioactive solid waste containing a zirconium alloy, and in particular, it is attached to or obscured when processing radioactive solid waste containing a zirconium alloy in a treatment facility for disposal. It belongs to the technical field of an organic substance removing device in radioactive solid waste containing a zirconium alloy for removing organic substances such as waste, paper, nylon sheets and the like.
[0002]
[Prior art]
Zirconium radioactive waste containing organic materials such as waste, paper, and nylon sheets may cause gas generation due to radiolysis or complex formation with specific radionuclides. Since it is not preferable for the disposal of radioactive solid waste containing alloys, it is desirable to remove such organic materials before disposal. On the other hand, for radioactive solid waste containing zirconium alloy, measures to prevent ignition of zirconium alloy fine are required. Therefore, organic substances mixed in radioactive solid waste containing a zirconium alloy can be removed by, for example, manual sorting while spraying water on radioactive solid waste containing a zirconium alloy, water flow sorting, or a process developed by AEA Technology. Utilization of wet oxidation process with hydrogen oxide water is considered.
[0003]
In the method for removing organic substances from radioactive solid waste containing zirconium alloy as described above, the efficiency of organic substance sorting is poor and the cost of removing organic substances increases. It has been.
(1) A radioactive solid waste containing a zirconium alloy is put into a water flow cleaning device with a stirring blade to remove organic substances.
(2) A container containing radioactive solid waste containing a zirconium alloy is set in an ultrasonic cleaning apparatus, and water is injected and air is blown to remove organic substances.
[0004]
[Problems to be solved by the invention]
In the removal of organic substances using the water flow sorter and the ultrasonic cleaning apparatus, neither radioactive solid waste containing zirconium alloy can flow, so the mixed organic substance contains radioactive solids containing zirconium alloy. It is considered that it is difficult to pass between the layers of waste and the separation efficiency of organic substances is low. In addition, it is conceivable that the radioactive solid waste containing the zirconium alloy is not stored in the container, but the organic substance is removed by putting it in the cleaning device as it is. Since it is necessary to store in a transfer container at the time of transfer to the process, it is not possible to improve the transfer work efficiency of radioactive solid waste containing zirconium alloy after the organic substance removal.
[0005]
Accordingly, an object of the present invention is to have an excellent removal efficiency of organic substances in radioactive solid waste containing a zirconium alloy and to transfer radioactive solid waste containing a zirconium alloy after removal of organic substances to a transfer container when transferring to the next step. An object of the present invention is to provide a device for removing organic substances in radioactive solid waste containing a zirconium alloy that does not need to be stored.
[0006]
[Means for Solving the Problems]
The present invention has been made in view of the above circumstances, and therefore, in order to solve the above-described problems, an organic substance removing device in radioactive solid waste containing a zirconium alloy according to claim 1 of the present invention is employed. Means for removing organic substances in radioactive solid waste containing zirconium alloy for removing organic substances such as waste, paper, nylon sheets, etc. adhering or clinging from radioactive solid waste containing zirconium alloy , The organic substance removing device is capable of overflowing the cleaning water supplied while rotating around an inclined axis passing through the center in the radial direction, and being freely put into and out of the rotary cleaning tank 1. The radioactive solid waste H that is disposed and contains the zirconium alloy is stored, and the storage container 5 having a large number of water passage holes 5b, and the circuit Wherein the cleaning tank 1 is provided with a frame 6 to be mounted.
[0007]
The means adopted by the organic substance removing device in radioactive solid waste containing zirconium alloy according to claim 2 of the present invention is the organic substance removing device in radioactive solid waste containing zirconium alloy according to claim 1, A gantry tilting device 10 is provided on one side of the gantry 6 so as to be tiltable by a fulcrum pin, and the gantry 6 is tilted on the other side of the gantry 6 so that the rotary cleaning tank 1 is at least vertical. It is characterized by.
[0008]
The organic substance removal apparatus in the radioactive solid waste containing the zirconium alloy according to claim 3 of the present invention adopts the organic substance removal apparatus in the radioactive solid waste containing the zirconium alloy according to claim 1 or 2. In this embodiment, a tubular stirring air supply nozzle 11 for supplying stirring air into the storage container 5 from the lower side is provided at the rotation center of the rotary cleaning tank 1.
[0009]
The organic substance removing device in the radioactive solid waste containing the zirconium alloy according to claim 4 of the present invention employs the organic substance removing device in the radioactive solid waste containing the zirconium alloy according to claim 1 or 2. In this embodiment, a reciprocating ultrasonic transducer 13 is provided on the outer side of the rotary cleaning tank 1 on the opening side so as to enter the rotary cleaning tank 1 so as to be able to advance and retreat through the opening and to apply ultrasonic vibration to the cleaning water. It is provided.
[0010]
The means adopted by the organic substance removing device in radioactive solid waste containing zirconium alloy according to claim 5 of the present invention is the same as that in the radioactive solid waste containing zirconium alloy according to claim 1, 2, 3 or 4. In the organic substance removing apparatus, waste water made of washing water containing organic substances overflowing from the rotary washing tank 1 is filtered outside the gantry 6 and the filtered filtrate is circulated to the rotary washing tank 1 as washing water. A filtration / circulation device 20 is provided.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the organic substance removal apparatus in the radioactive solid waste containing the zirconium alloy which concerns on Embodiment 1 corresponding to Claim 1 of this invention is demonstrated, referring FIG. 1 of the partial cross section side view.
[0012]
Reference numeral 1 shown in FIG. 1 denotes a rotary cleaning tank that is inclined at a preferable inclination angle, and the tip of the inclined rotary shaft 2 is fixed to the center of the bottom surface of the rotary cleaning tank 1 in the radial direction. . The inclined rotating shaft 2 is supported in an inclined state by a bearing 3 attached to a bearing mounting base 6a projecting substantially at the center of the gantry 6. The driven pulley portion 2a on the lower end side of the inclined rotating shaft 2 and the output shaft of the variable speed drive motor 4 attached to the motor mount 6b protruding from the right side of the gantry 6 in FIG. The belt B is straddled across the drive pulley 4a that is externally fitted, and the rotary cleaning tank 1 is inclined by the drive motor 4 and protrudes from the left side of the gantry 6 in FIG. Further, a support roller 7 (in FIG. 1, only one is shown, but in reality there are two rollers) that are in contact with the outer periphery of the rotary cleaning tank 1 supported across the pair of roller mounting bases 6c. It is configured to be rotated while being supported by.
[0013]
The drive pulley 4a and the driven pulley portion 2a can be replaced with sprockets, and the belt B can be replaced with an endless chain. The rotary cleaning tank 1 is supported, for example, on the outer periphery of the bottom so as to be rotatable in an inclined state, and a ring gear is externally fitted to the circular cylinder part of the rotary cleaning tank 1 below the support roller 7 or rotated. A gear can be fixed to the bottom of the washing tank 1 and a ring gear or a gear can be engaged with a pinion rotated by a drive motor, that is, a rotation mechanism such as a concrete mixer can be used. Since it is also possible to adopt a configuration in which a rotational force is applied to the roller 7 to support and rotate the rotary cleaning tank 1, the configuration is not particularly limited to the above-described rotating means.
[0014]
And the set rod 1a is implanted in three places (only two places are shown in the figure) of the equidistant position on the circular line centering on the center of the radial direction of the inner bottom face of the said rotary washing tank 1. In the state where the outer periphery in the vicinity of the bottom portion is sandwiched between these, a storage container 5 that can be taken out is set, which will be described later. The number of set rods 1a is three because three sets are necessary and sufficient for setting the storage container 5, but four or more set rods 1a may be planted, for example.
[0015]
This storage container 5 is provided with a hanging metal fitting 5a at the top and radioactive solid waste containing a zirconium alloy housed inside (a fuel cladding tube having an outer diameter of about 10 mm cut into a length of 40 to 50 mm. Hereinafter referred to as solid waste.) A large number of water passage holes 5b through which washing water containing organic substances such as waste, paper, nylon sheets and the like removed from H flow out into the rotary washing tank 1 are provided. The solid waste H after removal is configured such that, for example, a wire hung on a hanging metal fitting 5a can be transferred to the next process while being stored in a storage container 5 that is hung on a crane hook. The storage container 5 may have a mesh-like configuration made of a wire mesh having a mesh of a predetermined size.
[0016]
A cleaning water supply nozzle 8 that supplies cleaning water to the rotary cleaning tank 1 is provided above the rotary cleaning tank 1. The cleaning water supplied from the cleaning water supply nozzle 8 removes organic substances from the solid waste H, but the cleaning water containing organic substances overflows from the upper edge of the opening of the rotary cleaning tank 1 and overflows. The water receiver 9 is configured to receive water.
[0017]
Hereinafter, the operation mode of the organic substance removing apparatus having the above-described configuration will be described. First, the storage container 5 storing the solid waste H is suspended through the hanging metal fitting 5a and lowered into the rotary cleaning tank 1, It is set between three set rods 1a. Next, when the cleaning water is supplied to the rotary cleaning tank 1 from the cleaning water supply nozzle 8 and the cleaning water starts to overflow, the drive motor 4 is driven to drive the pulley 4a, the belt B, the driven pulley 2a, and the inclined rotating shaft 2 Since the rotary cleaning tank 1 is rotated through the storage tank 5, the storage container 5 is rotated together with the rotary cleaning tank 1.
[0018]
Therefore, since the solid waste H stored in the storage container 5 is moving around in a state where it is immersed in the washing water by the rotation of the storage container 5, the waste, paper, An organic substance such as a nylon sheet is separated from the solid waste H, and the separated organic substance passes between the moving waste layers and floats on the surface of the washing water. Thus, since the solid waste H is moving around, the organic substance can be effectively removed from the solid waste H, and the removed organic substance can easily pass between the waste layers. The removal efficiency of organic substances by water flow is extremely excellent. On the other hand, since the cleaning water is continuously supplied from the cleaning water supply nozzle 8, the organic substance that has floated on the surface of the cleaning water is accompanied by the cleaning water and is located at the lowermost position of the opening of the rotary cleaning layer 1. , And flows down with the wash water overflowing from the upper edge and received by the overflow water receiver 9.
[0019]
Thus, when the removal operation of the organic substance from the solid waste H is completed, the rotation of the rotary washing tank 1 is stopped, and for example, the wire hung on the hanging bracket 5a is hung on the crane hook and hung. Since the solid waste H after removal of the organic substance is transferred to the next process without being transferred to the transfer container, for example, compared with the case where the transfer is necessary, the organic substance is removed. The work efficiency of transferring the solid waste H after removal is extremely excellent.
[0020]
Next, an organic substance removing device in solid waste according to Embodiment 2 corresponding to claim 2 of the present invention will be described with reference to FIG. However, the difference between the second embodiment and the first embodiment is that the gantry can be tilted, and the rest is exactly the same, so the same as the first embodiment is the same. Only the different points will be described below with reference numerals, and the organic substance removing apparatus according to Embodiment 2 of the present invention will be described with reference to FIG. It can be tilted up.
[0021]
More specifically, a gantry tilting support base 6a 'having a fulcrum pin protrudes from one side of the base gantry 6', that is, the right side in FIG. 2, and a gantry support base 6b 'projects from the other side. Yes. The gantry 6 is supported on the gantry tilting support 6a 'via a fulcrum pin so that the gantry 6 can tilt, and the other side of the gantry 6 is supported on the top of the gantry support 6b'. In addition, a tilting cylinder 10 that is a frame tilting device that tilts the frame 6 until the tilt rotation shaft 2 is at least vertical is interposed between the base frame 6 ′ and the frame 6. As the tilting cylinder 10, for example, a hydraulic / pneumatic cylinder or an electric cylinder can be used.
[0022]
Therefore, the organic substance removing apparatus according to the second embodiment has the same organic substance removing efficiency as the organic substance removing apparatus according to the first embodiment, but the gantry 6 is moved by the extension of the rod of the tilt cylinder 10. By tilting, the rotary cleaning layer 1 becomes vertical so that the opening is directly above, and the storage container 5 can be easily put in and out of the rotary cleaning layer 1, so that the solid waste H after removal of the organic substances can be removed. The transfer work efficiency is superior to the organic substance removing apparatus according to the first embodiment. Further, since the gap between the rotary cleaning layer 1 and the storage container 5 required for taking in and out of the storage container 5 can be narrowed, the rotary cleaning layer 1 can be compared with the organic substance removing apparatus according to the first embodiment. There is an effect that can be miniaturized. Furthermore, there is an effect that the rotary cleaning layer 1 can be set to an inclination angle value most suitable for removing the organic substance.
[0023]
Next, an organic substance removal device in solid waste according to Embodiment 3 corresponding to claim 3 of the present invention will be described with reference to FIG. However, the difference between the third embodiment and the first embodiment is that the configuration is such that stirring air and washing water can be supplied into the storage container through the inclined rotation shaft. 1 are denoted by the same reference numerals, and only the differences will be described below. The organic substance removing apparatus according to the third embodiment is inclined and rotated as is well understood from FIG. A through hole 2b communicating from the lower end to the inside of the rotary washing tank 1 is provided at the rotation center position of the shaft 2, and a tubular agitation air supply nozzle 11 for supplying agitation air into the storage container 5 can be watertight in this through hole 2b. The cleaning water supply nozzle 8 for supplying cleaning water to the center of the stirring air supply nozzle 11 in the radial direction is inserted. Note that only the stirring air supply nozzle 11 can be inserted into the inclined rotating shaft 2. However, in this case, it is necessary to dispose the cleaning water supply nozzle 8 above the rotary cleaning tank 1 as in the organic substance removing apparatus according to Embodiment 1 or 2.
[0024]
Therefore, according to the organic substance removing apparatus according to the third embodiment, the washing water flows vigorously by the agitating air blown from the agitating air supply nozzle 11, so that the removal efficiency of the organic substance is the same as in the first or second embodiment. Better than. And since it is not necessary to arrange | position the washing water supply nozzle 8 above the rotary washing tank 1, compared with the organic substance removal apparatus which concerns on the said Embodiment 1, this organic substance removal apparatus can be reduced in size. There is an effect that can be done. It should be noted that the tilting mechanism employed in the second embodiment can be applied to the organic substance removing apparatus according to the third embodiment, and the organic substance removing apparatus can be further reduced in size by employing such a tilting mechanism. Is possible.
[0025]
Next, an organic substance removing device in solid waste according to Embodiment 4 corresponding to claim 4 of the present invention will be described with reference to FIG. However, the difference between the fourth embodiment and the first embodiment is that an ultrasonic transducer is provided, and the other components are exactly the same, so the same components as those of the first embodiment have the same reference numerals. Only the differences will be described below. The organic substance removing apparatus according to the fourth embodiment has the air above the opening of the rotary cleaning tank 1 as well understood from FIG. A cylinder 12 is provided, and an ultrasonic vibrator 13 that applies ultrasonic vibration to cleaning water is fixed to the tip of a rod that expands and contracts in the downward direction of the air cylinder 12.
[0026]
Therefore, according to the organic substance removing apparatus according to the fourth embodiment, the vibration is given to the washing water by the ultrasonic vibrator 13 lowered so that the lower part is immersed in the washing water. The organic substance removal efficiency is equal to that in the third embodiment, which is superior to the first or second embodiment. Note that the tilting mechanism employed in the second embodiment can be applied to the organic substance removing apparatus according to the fourth embodiment.
[0027]
Next, referring to FIG. 5 which is a partial cross-sectional side view (including a filtration / circulation device) of an organic substance removal device in solid waste according to Embodiment 5 corresponding to claim 5 of the present invention. While explaining. However, the fifth embodiment is different from the first embodiment in that a filtration / circulation device is provided, and the other components are exactly the same, so the same components as those in the first embodiment are denoted by the same reference numerals. In addition, only the differences will be described below. The organic substance removal apparatus according to the fifth embodiment can effectively reduce the organic substance removal cost of the solid waste H by circulating the cleaning water and using it effectively. For the purpose of reduction, a filtration / circulation device 20 having a configuration described later is provided.
[0028]
The filtration / circulation device 20 includes a waste water receiving tank 21 for storing waste water made of cleaning water containing organic substances received by the overflow water receiver 9, a waste water pump 22 for discharging waste water in the waste water receiving tank 21, and the waste water pump. A filter 23 for filtering waste water discharged from the filter 22, a filtered water storage tank 24 for storing filtered water filtered by the filter 23, and a supply of cleaning water using the filtered water stored in the filtered water storage tank 24 as cleaning water The cleaning water supply pump 25 supplies the nozzle 8.
[0029]
Therefore, according to the organic substance removing apparatus according to the fifth embodiment, since only a filtration / circulation device is added, there is an effect equivalent to that of the first, second, third or fourth embodiment, The filtration / circulation device 20 filters waste water composed of washing water containing organic substances, and can be reused by supplying the filtered filtration water as washing water to the washing water supply nozzle 8 for circulation. Compared to the organic substance removing apparatus according to the first, second, third, or fourth embodiment, the amount of washing water used is small, and the amount of secondary waste liquid generated is reduced, so that the organic substance removing cost can be reduced. . The filtration / circulation device 20 can also be applied to the organic substance removing device according to the first, second, third, or fourth embodiment.
[0030]
【The invention's effect】
As described above, according to the solid waste organic substance removing device according to claims 1 to 5 of the present invention, the solid waste in the storage container rotated by the inclined rotation shaft is washed by the rotation of the storage container. Waste that moves around while moving in the water so that organic substances such as waste, paper, and nylon sheets that are attached to or moving around are separated from solid waste, and the separated organic substances are moving around Since it passes between the layers, the organic substance removal efficiency is excellent, and the solid waste after removal of the organic substance can be transferred to the next process without being transferred to the transfer container. The solid waste transfer work efficiency after material removal is extremely excellent, greatly contributing to the improvement of the removal efficiency of organic substances in solid waste and the solid waste transfer work efficiency after organic substance removal Rukoto can.
[Brief description of the drawings]
FIG. 1 is a partial cross-sectional side view of an apparatus for removing an organic substance in solid waste according to a first embodiment corresponding to claim 1 of the present invention.
FIG. 2 is a partial cross-sectional side view of an apparatus for removing an organic substance in solid waste according to a second embodiment corresponding to claim 2 of the present invention.
FIG. 3 is a partial cross-sectional side view of an apparatus for removing an organic substance in solid waste according to a third embodiment corresponding to claim 3 of the present invention.
FIG. 4 is a partial cross-sectional side view of an organic substance removing device in solid waste according to Embodiment 4 corresponding to claim 4 of the present invention;
FIG. 5 is a partial cross-sectional side view (including a filtration / circulation device) of an organic substance removal device in solid waste according to Embodiment 5 corresponding to claim 5 of the present invention;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Rotary washing tank, 1a ... Set rod 2 ... Inclination rotating shaft, 2a ... Driven pulley part, 2b ... Through-hole 3 ... Bearing 4 ... Drive motor, 4a ... Drive pulley 5 ... Storage container, 5a ... Suspension metal fitting, 5b ... Water passage hole 6 ... frame, 6a ... bearing mount, 6b ... motor mount, 6c ... roller mount 6 '... base frame, 6a' ... frame tilting support table, 6b '... frame support block 7 ... support roller 8 ... Washing water supply nozzle 9 ... Overflow water receiver 10 ... Tilt cylinder 11 ... Stirring air supply nozzle 12 ... Air cylinder 13 ... Ultrasonic vibrator 20 ... Filtration / circulation device 21 ... Wastewater receiving tank 22 ... Wastewater pump 23 ... Filter 24 ... Filtration Water reservoir 25 ... wash water supply pump B ... belt H ... solid waste

Claims (5)

In the apparatus for removing an organic substance in a radioactive solid waste containing a zirconium alloy for removing organic substances such as waste, paper, and nylon sheets adhering or clinging from the radioactive solid waste containing a zirconium alloy, The organic substance removing device is disposed so as to be freely inserted into and removed from the rotary cleaning tank 1 for overflowing the cleaning water supplied while being rotated about the inclined axis passing through the center in the radial direction. A radioactive solid waste H containing a zirconium alloy is stored, and a storage container 5 having a large number of water passage holes 5b and a mount 6 on which the rotary cleaning tank 1 is mounted are provided. Organic substance removal equipment in radioactive solid waste containing zirconium alloy. A gantry tilting device 10 is provided on one side of the gantry 6 so as to be tiltable by a fulcrum pin, and the gantry 6 is tilted on the other side of the gantry 6 so that the rotary cleaning tank 1 is at least vertical. The organic substance removal apparatus in the radioactive solid waste containing the zirconium alloy of Claim 1 characterized by these. 3. The zirconium alloy according to claim 1, wherein a tubular stirring air supply nozzle 11 for supplying stirring air into the storage container 5 from the lower side is provided at the rotation center of the rotary cleaning tank 1. Equipment for removing organic substances from radioactive solid waste. A reciprocating ultrasonic transducer 13 is provided outside the rotary cleaning tank 1 on the opening side so as to enter the rotary cleaning tank 1 so as to be able to move forward and backward through the opening and apply ultrasonic vibration to the cleaning water. The organic substance removal apparatus in the radioactive solid waste containing the zirconium alloy of Claim 1 or 2 characterized by the above-mentioned. A filtration / circulation device 20 for filtering waste water composed of cleaning water containing organic substances overflowing from the rotary cleaning tank 1 and circulating the filtered filtrate into the rotary cleaning tank 1 as cleaning water is provided outside the mount 6. The organic substance removal apparatus in the radioactive solid waste containing the zirconium alloy of Claim 1, 2, 3 or 4 characterized by the above-mentioned.

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