JPS6362260B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a method of granulating fine powder particles suspended in a fluid, for example, fine magnetic powder particles suspended in a primary and secondary system coolant of a nuclear reactor. The present invention relates to a separating device for magnetic powder and granules that can obtain a high removal rate by removing the particles after reducing the particle size to a certain degree.

When removing magnetic powder produced in the primary and secondary coolant of a nuclear reactor using a separator, if the particle size of the product becomes 3 μm or less, removal becomes difficult and efficiency drops significantly. In other words, if the separator is a cyclone separator or an alternating magnetic field type separator, the removal rate will be lower, and if the separator is a cyclone separator or an alternating magnetic field type separator, the filter may become clogged due to its fine mesh, increasing pressure loss and increasing the frequency of filter replacement. This leads to a decrease in efficiency. Therefore, in order to solve these problems, it has been considered to granulate magnetic powder to a certain degree of particle size and then remove it. There is one shown in Publication No. 21267.

However, since the method disclosed in the above publication simply applies magnetism to granulate, if the fluid containing the magnetic powder is at high speed or the concentration of the magnetic powder is low, However, since granulation is difficult, good removal efficiency cannot be obtained, and the throughput cannot be increased, resulting in poor efficiency.

An object of the present invention is to remove magnetic powder and granules with high removal efficiency and efficiency. A granulator that houses a matrix of porous amorphous metal magnetic material in the form of fine wires inside a container, houses a vibrator and a diaphragm, and has magnetism generating means arranged around the outer periphery of the container, and granulated magnetic powder. The present invention is characterized by being equipped with a separator for removing particles.

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

In FIG. 1, 1 is a magnetic granulator that performs granulation using magnetism, and 2 is a separator such as a cyclone separator, a filter, or an alternating magnetic field type separator provided downstream of the granulator 1.

A detailed example of the granulator 1 will be described with reference to FIG. 2. A canister 7 having a plurality of water passage holes 6 in the bottom is housed in a required container 5 to which pipes 3 and 4 are connected. A diaphragm 9 with a plurality of water holes 8 formed on its upper surface is disposed within the diaphragm 7, and a matrix 10 is housed between the diaphragm 9 and the canister 7. A vibrator 11 such as a oscillator or an electrostrictive vibrator is attached, an electromagnetic coil 12 is arranged around the outer periphery of the container 5, and a high-temperature, high-voltage electric wire is installed on the cable insertion surface that sends a high-frequency current to the vibrator 11 on the top surface of the container 5. Attach the penetration part 13.

The matrix 10 is made of porous amorphous metallic magnetic material in the form of thin wires, and is in the form of a thin tape, and is preferably arranged so that its longitudinal direction is parallel to the flow. It may be an at random arrangement.

Next, the operation of the present invention will be explained.

During granulation, a fluid in which magnetic powder particles are suspended is supplied from a pipe 3 to a container 5, passed through 10 parts of the matrix, discharged to a pipe 4, and discharged from the pipe 4 to the outside of the line. The magnetic powder particles are attached to the matrix 10 by the high gradient magnetism generated by the electromagnetic coil 12, and granulation is performed by adhering other products to the attached portions.

After granulation is carried out for a certain period of time and the particle size of the magnetic powder becomes a particle size corresponding to the type of separator 2, the fluid is supplied from the conduit 3 while the electromagnetic coil 12 is turned off, and the vibrator 11 is turned off. By applying a high frequency or electrostrictive current of 10 to 15 KC, the matrix 10 is vibrated through the diaphragm 9, the granulated deposits are separated from the matrix 10, and the detached deposits are removed from the conduit 3. Together with the supplied washing water, it is sent to a separator 2 through a pipe line 4, and the separator 2 separates the magnetic powder which has been granulated and whose particle size has increased. Separator 2
When the separator 2 is a cyclone separator or an alternating magnetic field type separator, the powder is granulated to a size of 3μ or more, and when the separator 2 is a filter, it is granulated to a size of about 10 to 20μ.

It goes without saying that an electromagnetic filter, a mille pore, etc. can be used as the separator used in the present invention, and that various other changes can be made without departing from the gist of the present invention.

According to the magnetic powder separation device of the present invention, () magnetic powder can be reliably produced in the granulator even when the fluid containing the magnetic powder is at high speed or when the concentration of the magnetic powder is low; In addition to being able to granulate, it is possible to efficiently and reliably remove the granulated deposits from the granulator, and since granulation increases the weight of each product grain, the effect of centrifugal force and The sedimentation rate of the product in water is increased, and therefore the removal efficiency is very good (approximately 4 times that of removal without granulation) and the efficiency is also improved due to the higher throughput.

() When a filter is used as a separator, the degree of clogging is reduced, reducing the frequency of filter replacement, improving work efficiency, and less clogging reduces pressure loss, contributing to energy savings. .

() If an alternating magnetic field type separator is used as the separator, it can be made smaller.

() Since the entire device has a simple structure, initial costs can be reduced.

Various excellent effects can be achieved.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of an embodiment of the present invention, and FIG. 2 is an explanatory diagram of a granulator used in the embodiment of FIG. In the figure, 1 indicates a magnetic granulator, and 2 indicates a separator.

Claims (1)

[Claims] 1. In order to magnetically granulate magnetic powder with a small particle size, a matrix of porous amorphous metal magnetic material in the form of fine wires is housed inside the container, and a vibrator and a diaphragm are also housed, and the matrix is placed around the outer periphery of the container. 1. An apparatus for separating magnetic powder and granules, comprising: a granulator equipped with a magnetism generating means; and a separator for removing the granulated magnetic powder.