JPH06182125A - Electromagnetic filter device - Google Patents

Abstract

PURPOSE:To provide an electromagnetic filter device ensuring filtering operation of a transition period requiring magnetic force of large capacity by a small-scale electromagnet, reducing power consumption in the filtering operation at a steady time and capable of achieving the miniaturization of equipment as a whole. CONSTITUTION:A plurality of divided permanent magnets 3 are arranged on the same circle of circumference within the return frame 2 arranged to the outer periphery of a filter tower 1 so as to be spaced apart from the filter tower 1 in opposed relation to the tower 1 and an electromagnet 3 is arranged around the permanent magnets 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic filtration device for removing magnetic particles in a fluid to be treated, which is provided in a condensate system of a power plant, a treatment system of various waste liquids, and the like. The present invention relates to an electromagnetic filtering device that is combined to obtain a magnetic force.

[0002]

2. Description of the Related Art Conventionally, in primary cooling water of a PWR nuclear power plant, drain water of a thermal power plant, pure water production equipment, etc., magnetic particles in a liquid are removed by a filtration device utilizing magnetism. .

The general structure of a filtration device utilizing magnetism provided in such a plant is that pole pieces for reinforcing magnetic fields are provided at upper and lower ends of a filtration tower through which a liquid to be treated is passed, respectively. A type in which an electromagnet consisting of a coil and a return frame that is a yoke for generating magnetic lines of force is arranged around the filtration tower along the axial direction of the filtration tower, or a type in which a permanent magnet is embedded in a pole piece in the filtration tower. A method of forming a magnetic field by inserting or withdrawing a permanent magnet into a filtration tower has been proposed.

In addition, as disclosed in Japanese Utility Model Publication No. S58-107114 between the upper and lower pole pieces, a spiral magnetic material having a hole in the center thereof and magnetic wool are superposed in the filtration tower. In order to enhance the filtration function, magnetic particles are adsorbed by stacking a plurality of the above-mentioned ones, and this packing is supported by a pole piece.

[0005]

However, in each of the above-mentioned conventional filtration devices utilizing magnetism, some difficulties have been pointed out due to the characteristics of the entire equipment.

[0006] One of the problems is that the amount of magnetic particles generated at the initial stage of starting the condensate system of a power plant is much larger than that at the time of steady operation. This has led to larger equipment.

That is, since a large current is required, it is necessary to enlarge the capacity of electric equipment having a large capacity and the cooling equipment for cooling the electromagnetic coil due to an increase in the amount of heat generated by the electromagnetic coil.

Further, in the type in which the permanent magnet is provided in the filtration tower, since the permanent magnet contacts the fluid to be treated, there is a possibility that the magnetism may be lost or weakened when the fluid to be treated is at a high temperature. Further, in the type in which the permanent magnets can be moved, the structure of the operating part becomes complicated, not only the cause of failure increases but also the cost increases.

The present invention solves such a problem, can cover a filtering operation in a transitional period that requires a large-capacity magnetic force with a small-scale electromagnet, and can reduce power consumption in a stationary filtering operation.
It is an object of the present invention to provide an electromagnetic filtration device capable of downsizing the equipment as a whole.

[0010]

The constitution for achieving the object of the present invention is as set forth in the claims, and specifically, a magnetic field is generated in the filtration tower by the magnetic field generating means,
In an electromagnetic filtration device for magnetically retaining magnetic particles in a liquid to be processed which is circulated in the filtration tower, the magnetic field generating means includes a permanent magnet arranged on the outer periphery of the filtration tower so as to be spaced apart from and face the filtration tower. , And an electromagnet arranged on the inner or outer peripheral side of the permanent magnet.

[0011]

According to the above construction, even if the maximum capacity of the electromagnet is reduced, the shortage of the maximum magnetic force required for filtration can be covered by the permanent magnet, and the magnetic force of the permanent magnet can be used as it is even in the steady state. Therefore, the power consumption of the electromagnet can be reduced.

[0012]

1 shows a first embodiment of the present invention, in which FIG. 1 (a) is a longitudinal sectional view and FIG. 1 (b) is a lateral sectional view.

Reference numeral 1 denotes a filtration tower, which is filled with a packing 5 in which a spiral magnetic material as described in the conventional example and magnetic wool are superposed in a plurality of layers, and the packing 5 is filled. The pole pieces 6 are arranged at the upper and lower ends, respectively.

Reference numeral 2 denotes an outside of the filtration tower 1, which is a return frame arranged so as to surround the filtration tower 1 to supplement the magnetic lines of force coming out of the filtration tower to strengthen the strength of the magnetic field. The pole piece 6 is arranged in close proximity to the pole piece 6. Inside the return frame 2, a plurality of permanent magnets 4 are arranged on the same circumference so as to surround the filtration tower 1, and form a magnetic path in the filtration tower 1 as shown in FIG.

Further, an electromagnet 3 is arranged on the outer peripheral side of the plurality of permanent magnets 4 so as to surround the filtration tower 1, and as shown in FIG. 2B, a magnetic force can be generated in the same direction as the permanent magnets 4. .

Further, when the direction of the electric current is reversed during the backwashing step for regenerating the inside of the filtration tower 1, a magnetic field in the direction opposite to the magnetic field of the permanent magnet 4 is generated as shown in FIG. By canceling the magnetic field, the magnetic field is turned off, and water and air for backwashing are made to flow in opposite directions to wash away the adsorbed magnetic substance.

In the present embodiment, the capacity of the electromagnet 3 does not need to be able to generate a magnetic force that can cover the maximum capacity required by the filtration tower 1, and the total of the magnetic forces of the plurality of permanent magnets 4 requires the filtration tower 1. It suffices if it can generate a magnetic force that can cover the maximum capacity to operate.

Therefore, the capacity of the electromagnet 3 can be made smaller than before, and the shortage can be covered by the permanent magnet 4, so that the auxiliary equipment including the electromagnet and the cooling equipment and the equipment capacity of the permanent magnet can be greatly reduced. This means that, for example, if the permanent magnet has a magnetic force that is required in the steady state, it is almost unnecessary to drive the electromagnet 3 in the steady state, and the power consumption can be significantly reduced.

Further, since the permanent magnet 4 is arranged outside the filtration tower 1, it is not directly affected by the high temperature in the filtration tower,
It is possible to prevent the magnetic force from being lost or weakened.

Although the electromagnet 3 is arranged on the outer peripheral side of the permanent magnet 4 in this embodiment, the reverse may be adopted.

In the above embodiment, one set of magnetic field generating means (return frame 2, electromagnet 3,
Although a permanent magnet 4 and a pair of pole pieces 6) are provided,
As shown in FIG. 3, two sets of upper and lower magnetic force generating means may be provided.

[0022]

As described above, according to the present invention, the following effects can be obtained.

Since the permanent magnet is arranged outside the filtration tower, it does not come into contact with liquid as in the conventional case, so that there is no fear of loss of magnetic force or weakening, and it can be used semipermanently. : Since the permanent magnet is fixed and the moving means for moving the permanent magnet is not required, it is possible to reduce the breakdown and reduce the cost.

In the steady state, it is possible to use the permanent magnet alone without driving the electromagnet, or to obtain a predetermined magnetic force by supplying a current to the electromagnet to cover the insufficient magnetic force of the permanent magnet. The power consumption can be saved. In addition, the reduction of power consumption can reduce the cooling capacity of the electromagnet.

Therefore, it is possible to reduce the size and cost of the device and its associated equipment.

Even if a permanent magnet is used, the inside of the filtration tower can be degaussed by switching the direction of the current flowing to the electromagnet, and the inside of the filtration tower can be washed.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a first embodiment of the present invention.

FIG. 2 is a diagram showing the direction of magnetic force of the first embodiment shown in FIG.

FIG. 3 is a diagram showing a second embodiment.

[Explanation of symbols]

 1 Filtration tower 2 Return frame 3 Electromagnet 4 Permanent magnet 5 Filling material 6 Pole piece

Claims (6)

[Claims] 1. An electromagnetic filtration device in which a magnetic field is generated in a filtration tower by a magnetic field generation means to magnetically hold magnetic particles in a liquid to be treated flowing in the filtration tower. An electromagnetic filtration device comprising: a permanent magnet arranged on the outer periphery of the filtration tower so as to be spaced apart from and opposed to the filtration tower; and an electromagnet arranged on the inner circumference side or the outer circumference side of the permanent magnet. 2. The electromagnetic filtration device according to claim 1, wherein a filler for adsorbing a magnetic substance is filled in the filtration tower. 3. The electromagnetic filtration device according to claim 2, wherein pole pieces made of a magnetic material are arranged in the filtration tower so as to sandwich the packing material. 4. The electromagnetic filtration device according to claim 1, further comprising a return frame surrounding the permanent magnet and the electromagnet. 5. The electromagnetic filter device according to claim 1, wherein the permanent magnet is divided into a plurality of pieces and arranged on a concentric circle. 6. The energizing means for the electromagnet is capable of passing a current in a direction forming a magnetic field in a direction opposite to that of the permanent magnet, and flowing a current in a direction forming a magnetic field in the same direction as that of the permanent magnet. Claim 1, 2, 3, 4 or 5
To electromagnetic filter.