JPS5927625B2 - Magnetic powder separation equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device composed of magnetic powder mixed in water, etc., for example, for cooling piping of the primary and secondary cooling water systems of an atomic couplant. Radioactive crud dispersed and suspended in water (CRUD=CHALKR)
IVERREACTOR UNIDENTIFIED D
EPO8IT (abbreviation) relates to a device suitable for separating particles and concentrating them in one place.

Radioactive cladding particles generated from fuel rods and the like are dispersed and suspended in the cooling water of atomic couplants in service, and flow together with the cooling water.

These clad particles contain some magnetite (F1304).

It is clear that the amount of crud particles generated increases as the number of operations increases, and as a result, the air dose increases, resulting in an increase in the radiation exposure of workers during equipment protection, periodic inspections, repairs, etc. will be questioned.

Conversely, if the cladding particles are removed, it will be possible to reduce the radiation exposure of workers, reduce space radiation throughout the plant, and reuse water.

Furthermore, it will also lead to safe operation of the plant.

The present invention has been made in view of these points, and
This was obtained through intensive research by the present inventors, and it is an object of the present invention to provide a device that can magnetically separate magnetic particles from a fluid in which magnetic particles are mixed, and that can greatly improve the separation efficiency. The purpose is to

The gist of the present invention to achieve such an object is to provide a first magnetic field generating device for generating a traveling magnetic field including a rotational component, which is constructed by embedding a coil in a slot inclined on the inner circumferential surface of a magnetic cylinder. In addition, a second magnetic field generating device that generates a downward traveling magnetic field, which is made by embedding a coil in a slot on the inner peripheral surface of the magnetic cylinder, is arranged at the bottom, and a non-magnetic It is housed so as to pass through the cavity housing, and the cavity housing has a fluid inlet and a magnetic powder outlet at the bottom, a fluid outlet at the top, and a fluid inlet and a magnetic powder outlet inside the cavity housing. A partition plate extending upward to at least the height of the second magnetic field generating device is provided between the magnetic powder and granular material outlet, and in an embodiment of the present invention, a partition plate is provided that extends upward to at least the height of the second magnetic field generating device. In a cavity housing housed in a magnetic cylinder, one or more partition plates extending vertically are attached to divide the inside of the cavity housing into a plurality of n rooms N1. N2゜N3...
...It is divided into two rooms, each having a fluid inlet and a magnetic powder outlet at the bottom, and a fluid outlet at the top.

-1 The fluid outlet at the top of the room Nn and the fluid inlet at the bottom of the room Nn are connected to each other through a flow path, and the fluid that flows in from the fluid inlet at the bottom of the room N1 is circulated and then discharged from the fluid outlet at the top of the room Nn, and the same magnetic field generator This includes a magnetic powder separation device configured to perform magnetic separation n times.

Embodiments of the present invention will be described below with reference to the drawings.

1 to 4 are schematic diagrams showing a separation apparatus according to the present invention.

1 is a first magnetic field generating device which generates a downward traveling magnetic field f1 including a rotating component, which will be explained in detail later;
is a second magnetic field generating device, which also generates a downward traveling magnetic field f2, as will be described later.

3 is a cavity housing made of non-magnetic material, 4 is a fluid inlet for fluid Wo mixed with magnetic powder, 5 is an outlet for magnetic powder X, and 6 is a separated fluid W. , and 7 is a partition plate that extends upward between the fluid intake 4 and the outlet 5, and has a height corresponding to at least the height of the second magnetic field generator 2. .

The fluid Wo, whose flow rate or pressure has been adjusted, flows into the cavity housing 3 from the inlet 4 and is pushed upward through the N chamber in the direction of the fluid outlet 6.

The magnetic powder is separated by the advancing magnetic field f1 of the first magnetic field generator 1, and is absorbed into the inner circumferential surface of the cavity housing.
It is transferred to the room side and gradually falls along the partition plate 7.

Then, it is reliably pushed to the bottom of the cavity housing 3 by the advancing magnetic field f2 of the second magnetic field generator 2, and is taken out continuously or intermittently through a valve (not shown) of the takeout port 5.

This is the basic processing operation of this device.

The above basic processing operation will be explained using a development diagram (FIG. 13) as follows.

Inside the cavity housing 3, a flow a of fluid Wo rises from the inlet 4 toward the outlet 6.

The magnetic powder in this fluid Wo is transferred to the second magnetic field generator 2.
Although it is pressed down to some extent by the downward traveling magnetic field f2, most of it rises along with the flow a and reaches the magnetic field area of the first magnetic field generator 1.

□ The first magnetic field generator 1 has the role of separating the magnetic powder carried by the flow a from the flow a (moves it in the circumferential direction), and
It plays the role of moving magnetic powder in diagonal directions.

The movement of the magnetic powder is indicated by arrows. The magnetic powder that has separated from the flow a and moved diagonally downward reaches the magnetic field area of the second magnetic field generator 2, and the downward traveling magnetic field f2 from the second magnetic field generator 2 effectively works to spread the magnetic powder in the M chamber. Move to the bottom (
effect of compression).

There is leakage magnetic flux at the boundary between the first magnetic field generator 1 and the second magnetic field generator 2, and their effects overlap to cause smooth movement of the magnetic powder.

The magnetic powder pressed against the bottom of the M chamber also moves to the outlet 5 based on this principle.

A fluid W1 containing no magnetic particles is discharged from the outlet 6.

Figure 5 is a side view (partially broken) of magnetic field generators 1 and 2.
As is clear from FIG. 6, the first magnetic field generating device 1 has a slot 13 formed on the inner peripheral surface of the magnetic cylinder 11 that is inclined with respect to the axis, and a plurality of elongated ring coils installed in the slot 13. 12 is embedded.

By embedding the coil at an angle, a traveling magnetic field f2 containing a rotating component is generated.

Further, as is clear from FIG. 7, the second magnetic field generator 2 includes a plurality of slots 2 having the same diameter on the inner peripheral surface of the magnetic cylinder 21
3 are arranged in the vertical direction, and a plurality of long ring coils 22 are embedded in the slots 23 to generate a downward traveling magnetic field f2.

Furthermore, by embedding a wedge-shaped coil or the like in the second magnetic field generator 2, a downward magnetic field is generated only on the side corresponding to the M chamber t of the cavity housing 3 shown in FIGS. 2 and 4, and a downward magnetic field is generated on the N chamber side. The present application also includes the method of not burying the coil so that no magnetic field is generated.

The inner circumferences of the first and second magnetic field generators are required to be the same diameter, since the outer circumference of the cavity housing is the same diameter from top to bottom, and if the first magnetic field generator If the diameters of the cavity housing of the part corresponding to the generator and the part corresponding to the second magnetic field generator are slightly different, magnetic cylinders corresponding to these diameters can be used for the first and second magnetic field generators. Also good.

In the present invention, since the two magnetic field generators configured as described above are arranged so as to be coaxial, an extremely strong magnetic field can be applied to the cavity housing, and the magnetic poles of the magnetic field generators are Since it is generated on the inner circumferential surface, it is possible to extremely concentrate the magnetic field, and as a result, an improvement in magnetic separation efficiency can be expected.

FIG. 8 is a connection diagram of the coils of the first magnetic field generating device 1, in which long ring coils A to F are embedded and fixed in a large number of slots 13 provided on the inner circumferential surface of the magnetic cylinder 11. Connect the coils so that the current flows vertically upward in the paper for the coils marked with ■, and vertically downwards in the paper for the coils marked ■, and connect them to the three-phase power terminals U and V.

Connect to W respectively.

In the above, the coil is connected in a wire-wound manner, and the magnetic field runs on the inner peripheral surface of the cylinder.

FIG. 9 is a connection diagram of the coils of the second magnetic field generator 2, in which concentric coils, saddle-shaped coils, or long ring-shaped coils 22 are stacked in slots 23 provided on the inner peripheral surface of the magnetic cylinder 21. 3-phase power supply terminal U.

Configure connection to V and W.

As a result, the magnetic field runs downward on the inner surface of the magnetic cylinder 21.

FIG. 10 shows another embodiment of the present invention, which is basically the same as that in FIG. 1, with the structure of the partition plate 7 slightly different from that shown in FIG.

FIG. 11 shows another configuration example of the present invention, in which the interior of the cavity housing 3 is divided into two rooms (spaces) N1 and N2 by a partition plate 71.

A fluid population 41 and a magnetic powder outlet 51 are installed at the bottom of the chamber N1, and a fluid outlet 61 is installed at the top.

Similarly, a fluid population 42, a magnetic powder outlet 52, and a fluid outlet 62 are provided on the room N2 side.

Furthermore, inside the cavity housing 3, in the rooms N1 and N2, a second tube extending upwardly between the fluid population 41 and the outlet 51 and between the fluid population 42 and the outlet 52 is provided.
and third partition plates 72 and 73 are provided.

With this configuration, the fluid Wo in which magnetic powder and granules are mixed is magnetically separated in the room (space) Nl, and the treated fluid W is allowed to flow out from the fluid outlet 61, and the separated magnetic powder and granules X1 are is taken out from the take-out port 51.

The fluid W1 taken out from the outlet 61 is sent to the fluid intake 42 on the room N2 side through the communication pipe 8, and
2, the fluid W2 is subjected to magnetic separation processing, and a fluid W2 containing no magnetic particles is discharged from the fluid outlet 62.

The magnetic powder that could not be separated on the room N1 side is
Complete magnetic separation is achieved by second-side processing, and the separated magnetic powder is taken out from the take-out port 52.

Although a method of performing magnetic separation twice using a set of first and second magnetic field generating devices has been described, it is clear that the process can be performed several more times depending on the divided structure of the cavity housing.

Incidentally, although it is preferable that the above-described processing in the atomic couplant be performed by remote control, this does not limit the scope of the present application.

In addition, the magnetically separated magnetic cladding is stored in blocks made of concrete, lead, etc. to ensure safety.

In this case, since the magnetic cladding is concentrated, the block space can be used effectively.

As described above, according to the present invention, clad particles such as highly radioactive magnetite (peso4) mixed and suspended in the primary or secondary cooling water system of an atomic couplant are almost completely removed from the cooling water. Moreover, since it can be separated with high efficiency, it is possible to improve the safety of the atomic coupler or to extend the working time of workers during periodic inspections, and in turn, to reduce the costs.

Furthermore, it is expected that the life of the atomic couplant will be extended.

Note that the device according to the present invention is not limited to only atomic couplants.
Not only is it possible to remove and separate magnetic powder from thermal power plants, but it can also be used in all industries such as food, medicine, and chemical industries, and it can also be used as a pollution treatment device.

[Brief explanation of drawings]

FIG. 1 is a perspective (perspective) view schematically showing the device according to the present invention, FIG. 2 is a front sectional view of the device, FIG. 3 is a side sectional view of the device, and FIG. 4 is the ■Cross-sectional view from the direction,
FIG. 5 is a side (partially sectional) view of the first and second magnetic field generators used in the device, FIG. 6 is a plan (partially sectional) view of the first magnetic field generator, and FIG. 8 is a perspective view showing the configuration of the second magnetic field generating device, FIG. 8 is a plan view showing the electrical connection of the first magnetic field generating device, FIG. 9 is a side sectional view showing the electrical connection of the second magnetic field generating device, FIG. Fig. 10 is a schematic diagram showing another embodiment according to the present invention, Fig. 11 is a schematic configuration diagram (perspective view) of a device showing another embodiment according to the present invention, and Fig. 12 is a cross-sectional view of the cavity housing in the same device. The top view and FIG. 13 are developed views showing the basic processing operation of the present invention. DESCRIPTION OF SYMBOLS 1...First magnetic field generator, 2...Second magnetic field generator, 3...Cavity housing, 4
, 41° 42...Fluid inlet, 5, 51, 52.
... Magnetic powder outlet, 6, 61, 62.
...Fluid outlet, 7.71, 72, 73...
・Partition plate, 11, 21...Magnetic cylinder, 12,
22... Coil, 13, 23... Thrower], Wo... Fluid before treatment, Wl...
...Fluid after treatment, X...magnetic powder, fl,
f2...Advanced magnetic field.

Claims (1)

[Claims] 1. A first magnetic field generating device for generating a traveling magnetic field including a rotating component, which is formed by embedding a coil in a slot on the inner circumferential surface of the magnetic cylinder, is placed on the top, and a coil is embedded in the slot on the inner circumferential surface of the magnetic cylinder. A second magnetic field generating device for generating a downward traveling magnetic field, which is embedded in A fluid inlet and a magnetic powder outlet are provided at the bottom of the cavity housing, and a fluid outlet is provided at the top. A separating device for magnetic powder and granular material, characterized in that a partition plate is provided that extends upward to the height of the second magnetic field generating device.