JPH095493A - Resin suction tool for taking out waste resin - Google Patents

Abstract

PURPOSE: To provide a small and lightweight resin suction tool capable of being hand-carried from the inlet door of a waste resin storage tank and easily inserted into a manhole, freely adjusting the mixing ratio of water and a waste resin to be shifted from the storage tank to the outside, and immediately resolving the blocking even if a shift pipe is blocked by the waste resin. CONSTITUTION: This resin suction tool is constituted of a main body 11 provided with an inverted funnel-shaped shift port 13 connected to a shift pump at the apex, multiple stirring nozzles 14 provided radially at uniform intervals along the lower face of the main body 11 and jetting the stirring water from the lower end sections 15 curved downward toward the center section below the main body 11, multiple legs 16 protruded downward at uniform intervals from the periphery of the main body 11, and a circular plate 17 fixing the lower ends of multiple legs 16 on the upper face.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nuclear facility, for example, a waste tank for storing used waste resin produced in a primary cooling system ion exchange tower, which is used for transferring waste resin to another storage tank. The present invention relates to a resin suction tool for taking out resin.

[0002]

2. Description of the Related Art A large amount of waste resin is stored in a large storage tank, and the transfer pump is immersed in the water. The waste resin that accumulates under the surface of the water is floated into the water and stirred, and then the waste resin is pumped together with water. It is disclosed in Japanese Patent Application Laid-Open No. 61-161499 that the material is sucked and conveyed to a waste container outside the tank. Further, Japanese Utility Model Laid-Open No. 64-44498 discloses that a double pipe is inserted into a waste resin layer accumulated in a waste resin storage tank, the inner pipe is connected to a waste container by a transfer pipe, and an outer pipe and a waste container are connected. Connect a pump in the middle of the water reflux pipe that connects the inside, and operate the pump to return the water in the waste container to the storage tank by the reflux pipe, which causes the waste resin in the storage tank to be removed by the negative pressure generated in the waste container. It is disclosed to draw into a waste container with cooling water.

[0003]

The former method of the above-mentioned prior art in which the stirring and transfer pump is immersed in the water in the storage tank is very heavy because the weight of the pump is several hundred kg, and the pump is moved to various places in the storage tank. To do this, a heavy-load traveling crane must be installed in the tank, and the pump must be suspended from this. Therefore, in order to use the existing storage tank, the storage tank must be remodeled. Further, it is difficult to adjust the mixing ratio of the waste resin to be transferred and the cooling water, and if the concentration of the waste resin is high, the transfer pipe is clogged, and if clogged, it is difficult to wash and eliminate the clog. . Also, the latter of the prior art using a double pipe cannot adjust the mixing ratio of the waste resin and water to be transferred. Further, the waste resin storage tank that can be used is limited to a small diameter storage tank.

[0004]

The resin suction device of the present invention was developed in order to solve the above-mentioned problems of the conventional device, and is a reverse funnel type and has a transfer port connected to the transfer pump at the top. A main body provided with a plurality of stirring nozzles that are radially provided at equal intervals along the lower surface of the main body, and that eject the stirring water from the lower end portion that is curved inward toward the lower center portion of the main body, and the periphery of the main body. It is characterized in that it has a plurality of legs protruding downward at equal intervals and an annular plate in which the lower ends of the plurality of legs are fixed to the upper surface.

[0005]

Embodiment In the illustrated embodiment, a waste resin suction tool 1
Reference numeral 0 denotes a reverse funnel shape, which is provided radially at equal intervals along a main body 11 having a transfer port 13 connected to a transfer pump at the top of a small diameter, and a sloping lower surface 12 of the main body, and is directed toward the lower central part of the main body. A plurality of, for example, three stirring nozzles 14 for ejecting stirring water from a lower end portion 15 curved inwardly and a plurality of legs 16 protruding downward at equal intervals from around the large-diameter lower end portion of the main body. An annular plate 17 which is concentric with the main body and has the lower ends of a plurality of legs fixed to the upper surface. Body 11,
The legs 16 and the annular plate 17 are made of an iron plate, and the stirring nozzle 14 is made of a steel pipe. The diameter of the lower end portion of the main body or the annular plate is about 7
The height from the annular plate 17 to the upper end of the connection port 13 is about 500 mm, and the weight of the suction tool is about 10 kg. An annular header 18 having a water inlet for stirring water is provided above the inclined lower surface of the main body, and the upper ends of the three stirring nozzles 14 are connected to the annular header 18.
Further, in order to prevent the suction of foreign matter, a net 19 is stretched on the upper part of the inclined lower surface of the main body.

Therefore, as shown in FIG. 1, the transfer pump P
The hose 20 from the suction port of 1 is connected to the transfer port 13, the discharge port of the pump P1 is connected to the waste tank by the transfer pipe, and the water in the waste resin storage tank is connected to the water supply port 18 'of the annular header 18. Hose 2 from the outlet of the water pump P2
1 is connected, the suction tool 10 is lowered onto the waste resin accumulation layer 22 in water in the waste resin storage tank, and the respective pumps P1 and P2 are operated. The suction tool 10 rides on the waste resin deposition layer 22 by the annular plate 17, and since the annular plate functions as a snowshoe, the suction tool 10 is not buried in the waste resin deposition layer and the upper surface of the waste resin deposition layer, A predetermined distance L is maintained between the transfer opening 13 and the lower end. The distance L is preferably about 5 to 10 cm.

By the operation of the water supply pump P2, water is jetted from the lower ends of the three stirring nozzles 14 to the upper surface of the waste resin deposition layer located at the lower center of the main body, and the resin is soared in the water. When the transfer pump P1 is operated, the transfer port 13 sucks the rising resin together with water, and the mixture of the resin and water is transferred to the waste tank through the hose 20 and the transfer pump P1.

By adjusting the amount of the stirring water ejected from the stirring nozzle 14 according to the flow rate of the mixture of the resin and water, it is possible to keep the water and the resin in an appropriate ratio.

If a clogging phenomenon occurs in which the resin is clogged in the hose 20 from the transfer port 13 to the waste container or in the pipe, the operation of the water supply pump is stopped. As a result, the transfer port does not suck in the resin but only the water, so that the resin can be diluted and washed with this water to eliminate the blockage.

FIG. 3 is an explanatory view of transferring the waste resin in the water of the huge waste resin storage tank 23 to the waste tank 24. Storage tank 23
A small boat 25 with a screw floats on the surface W of water, and the suction tool 10 is attached to the lower end of the winch rope 26 loaded on this boat.
The suction tool 10 can be dropped on the upper surface of the waste resin deposition layer 22 by operating a winch, or can be pulled up when the ship is moved, and the suction tool can be lowered to another place. The transfer pump P1 and the water supply pump P2 are installed on the water surface W in the storage tank, and are connected to the transfer port 13 of the suction tool and the annular header 18 of the stirring nozzle by hoses 20 and 21. The suction port of the water supply pump P2 is a suction port 27 that floats on the water surface and the hose 2.
8 is used, the supernatant water in the storage tank is used as agitation water, and the supernatant water in the waste tank 24 is returned to the storage tank 23 by the return pump P3, so that makeup water is unnecessary. The suction port of this return pump is also connected by a hose 29 to the suction port 30 that floats on the water surface of the waste tank.

In the storage tank 23, an ultrasonic water level meter 31 for measuring the water level in the tank, a monitoring camera 32 for monitoring the inside of the tank,
A tracking camera 33 for the small boat 25 is provided. The tracking camera 33 always follows the lamps 34 attached to the front and rear of the small boat,
The image processing device 35 analyzes the image of the tracking camera and detects the position of the small boat. Further, 36 is a remote control unit of a small boat,
The movement, stop, and movement speed of the small boat can be set freely, and the height of waste resin accumulated at the place where the small boat is stopped is calculated and displayed from the amount of lifting of the suction tool 10. In this way, all the operations for transferring the waste resin in the waste resin storage tank 23 to the waste tank 24 and the monitoring can be performed remotely. Further, since each device is portable, if one set is prepared, it can be transferred to a waste resin in a plurality of waste resin storage tanks or a waste container.

[0012]

[Effects of the Invention] The used waste resin storage tank in a nuclear facility is a high dose area, and it is necessary to carry in and install waste resin transfer equipment promptly to minimize exposure.
In this respect, since the suction tool of the present invention is small and lightweight, it can be carried in by hand from the entrance door of the existing storage tank and easily inserted from the manhole. Since the mixing ratio of the water to be transferred and the waste resin can be adjusted freely, stable transfer can be performed. or,
Even if the transfer pipe becomes clogged with waste resin, only the water can be immediately transferred and washed to eliminate the clog. Moreover, even if the storage tank does not have a means for transferring the waste resin, the equipment can be easily installed and transferred without remodeling the existing one.

[Brief description of drawings]

FIG. 1 is a sectional view of a suction device of the present invention.

FIG. 2 is a plan view of the suction tool of FIG. 1 turned upside down.

FIG. 3 is an explanatory diagram showing a state in which waste resin is being transferred by a suction tool.

[Explanation of symbols]

 10 Suction Tool 11 Main Body of Suction Tool 12 Lower Surface of Main Body 13 Transfer Port 14 Stirring Nozzle 16 Leg 17 Ring Plate 18 Ring Header 19 Net

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Shinji Itakura 22 Oharazawa, Okuma-machi, Futaba-gun, Fukushima Prefecture Kitahara 22 Fukushima Daiichi Nuclear Power Plant (72) Inventor Takashi Iwai Nihombashi Kodenma-cho, Chuo-ku, Tokyo No. 4-9 Kurita Engineering Co., Ltd. Tokyo Branch

Claims (1)

[Claims] 1. A body having a reverse funnel shape and having a transfer port connected to a transfer pump at the top, and radially provided at equal intervals along the lower surface of the body, and directed inward toward a lower central portion of the body. It has a plurality of stirring nozzles for ejecting stirring water from a curved lower end, a plurality of legs projecting downward at equal intervals from the periphery of the main body, and an annular plate having the lower ends of the plurality of legs fixed to the upper surface. A resin suction tool for extracting waste resin, which is characterized in that