JPS588563A - Apparatus for separating magnetic particulate material - Google Patents

Abstract

PURPOSE:To make it possible to separate a magnetic particulate material mixed in a fluid in good efficiency, by a method wherein the magnetic particulate material mixed in a fluid is attracted by the inner wall surface of a cylindrical hollow barrel by a magnetic field generating apparatus as well as fallen and transferred along said inner wall surface. CONSTITUTION:To the bottom part of a housing 1 having a cylindrical hollow barrel 1a of which the axial center is vertical provided to the upper part thereof, a fluid inlet 2 is provided and, to the top part thereof, a fluid outlet 3 is provided respectively and the inlet 2 and the outlet 3 are isolated by a partition plate 4. In addition, a cylindrical magnetic field generating apparatus 5 arranged so as to be contacted with the outer periphery of the hollow barrel 1a is constituted in such a manner that a ring like groove is formed to the inner surface of a cylindrical magnetic pole 5a to embed a ring like coil 6 is connected to a three-phase AC power source to generate a downward advancing magnetic field. When the downward magnetic field is applied in the inside of the hollow barrel 1a, the magnetic field is acted on a fluid stream at right angles and a magnetic particulate material is magnetically attracted by the inner surface of the outer peripheral wall part of the hollow barrel 1a as well as fallen and transferred to a lower direction shown by an arrow to be efficiently separated.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device comprising magnetic powder mixed in a fluid such as gas, heat, water, etc., such as an atomic couplant.

Next, regarding a device suitable for separating radioactive cloud (0RUD) particles dispersed and suspended in a coolant such as piping of a two-body cooling water system from the fluid and concentrating the nine particles in one place, It's bad.

Radioactive cloud particles generated from fuel rods and the like are dispersed and suspended in the coolant of an atomic couplant in use, and flow together with the coolant. Most of these cloud particles are composed of magnetite (pe3o4) and the like.

Also, when a worn-out atomic couplant is destroyed, radioactive fumes or weapons are created.

Conventionally, the number of 2-Udo particles was 74! : It is often ignored and no effort has been made to remove it. However, it is clear that as the operating time becomes longer, the amount generated becomes enormous.
Therefore, the increased radiation exposure of workers during equipment protection, periodic inspections, repairs, etc. will be a problem. Conversely, if cloud particles are removed, the amount of radiation exposure per worker can be reduced.

It will be possible to reduce radiation throughout the plant and purify and reuse the coolant.

SUMMARY OF THE INVENTION Accordingly, it is a general object of the present invention to provide an apparatus for separating magnetic particles contained in a fluid.

A further object of the present invention is to provide a magnetic powder separation device that is small in size and has high separation efficiency.

The present invention includes a housing having a cylindrical cavity with a vertical axis, and is configured such that fluid flows in the circumferential direction within the cylindrical cavity, and is perpendicular to the fluid flowing in the circumferential direction. Moreover, it is based on the fact that a downward traveling magnetic field ε is applied.

The present invention will be explained in more detail using the drawings.

FIG. 1 shows an embodiment of the present invention.

Reference numeral 1 denotes a housing having a cylindrical cavity 1a whose axis is vertical. The housing 1 has a fluid port 2 at the bottom of the cylindrical cavity 1a and a fluid outlet 3 at the top. This is because the fluid population 2 and the fluid outlet 3 are separated by the partition plate 4.

From the fluid population 2, the cylindrical cavity 1a contains people and a fluid P mixed with magnetic particles. 9 inside the cylindrical cavity 1a in the circumferential direction A
, and is discharged from the exit 6 as shown by Pl.

Each is a cylindrical magnetic field generator fitted around the outer periphery of a cylindrical cavity 1a, and a plurality of ring-shaped grooves extending in the circumferential direction are formed on the inner surface of one cylindrical magnetic pole 5a. A ring-shaped coil 6 is buried in each groove of the cylinder, and these coils 6 are connected to a three-phase AC power source to generate a downward traveling magnetic field. When a downward traveling magnetic field is applied inside the shell 1a, the magnetic field acts perpendicularly to the fluid flow, and magnetic particles are magnetically attracted to the inner surface of the outer peripheral wall of the cylindrical cavity 1a. As shown by arrow F, it is transferred by falling. At this time, the direction of the flow of the fluid and the direction of the magnetic field traveling toward the particles are perpendicular to each other, so that the separation efficiency is extremely high.

Furthermore, a reservoir 1b is provided at the bottom of the housing 1. As the operating time elapses, the magnetic particles separate, gradually become concentrated, and accumulate in the reservoir 1b. The magnetic particles concentrated in the reservoir 1b are detected by a sensor 8 such as a magnetic sensor or a radiation detection element provided outside or inside the reservoir 1b.The amount of magnetic particles detected by the sensor 8 is displayed on a display device. 9. When the magnetic particles in the reservoir 1b exceed a certain amount, the fluid from the inlet is stopped and the pulp 7
is opened, and the magnetic particles are dropped in a concentrated state into a radioactive material storage container such as a lead container, and then stored in isolation. Once the magnetic particles in the reservoir 1b are gone, fluid is allowed to flow in from the inlet 2 in the same manner as described above to perform magnetic separation. In addition, it is possible to perform continuous recovery without worrying about the above operation cycle, and it is also possible to recover while controlling the radioactive concentration.

FIG. 2 shows another embodiment of the present invention, in which a magnetic field generator y for generating a downward traveling magnetic field is fitted into the inner periphery of the cylindrical cavity 1a of the housing 1.

In addition, partition plates 4a and 4b are provided at two locations spaced apart from each other along the circumferential direction inside the cylindrical cavity 1a, so that the fluid P can flow in from the inlet 2.

is separated once while flowing in the direction of arrow A, and taken out from the outlet 11, taken in again from the other inlet 13 through piping 12, and separated while flowing in the direction of arrow A'.

The fluid P2 from which the magnetic powder has been removed is discharged from the outlet 3. The rest is the same as in FIG. 1.

As explained above using the embodiments, according to the present invention,
Since the flow of fluid and the action of the magnetic field are at right angles, the separation efficiency is significantly improved compared to conventional methods even when the same current is passed through the same coil.

It is also reliable, and the entire device can now be made extremely simple.

Margin below

[Brief explanation of drawings]

FIG. 1 shows the configuration of an embodiment of the present invention, (a) is a plan view, (b) is a sectional view, and FIG. 2 is a configuration example of another embodiment of the present invention, (a) is a plan view. A plan view, and (b) a cross-sectional view. 1... Housing, 1a... Cylindrical cavity. 1b... Reservoir, 2... Fluid inlet, 3... Fluid outlet. 4.4a, 4b... Partition plate, 5... Magnetic field generator. 5a... Magnetic pole, 6... Coil, 7... Valve, 8
...Sensor, 9...Display device. Figure 1 Figure 2 Continued from page 1 0 Author Kotabe Sasaki 6-7-1 Koriyama, Sendai City Tohoku Metal Industry Co., Ltd. Applicant Ishikawajima Harima Heavy Industries Co., Ltd. 2-chome Otemachi, Chiyoda-ku, Tokyo No. 2 No. 1 ■ Applicant Tohoku Metal Industry Co., Ltd. 6-7-1 Koriyama, Sendai City

Claims (1)

[Claims] 1. A housing having a cylindrical cavity with a vertical axis;
means for passing fluid through the cylindrical cavity; means for regulating the flow direction of the fluid within the cylindrical cavity in a circumferential direction; and a magnetic pole in contact with the outer or inner periphery of the cylindrical cavity. and a magnetic field generating device that has a magnetic field and generates a downward traveling magnetic field,
A device for separating magnetic powder and granules, characterized in that the magnetic powder and granules mixed in a fluid are attracted to the inner wall surface of the cylindrical cavity and are transported falling along the inner wall surface.