JPH0427450A - Dust collector - Google Patents

Abstract

PURPOSE:To continuously and effectively collect powdery magnetic bodies in the range of 0.01-100mum particle-diameter with magnets or electromagnets by disposing magnetic poles provided with plural projections or magnetic poles having plural projections in a powder collecting part. CONSTITUTION:The magnetic pole 1 having plural projections is disposed at the branched point between a dust hopper 2 and a washing gas outlet duct 4, and flow straightening plates 5 and a flap 6 are disposed to improve the powder collecting effect, so that the collecting effect for the powder of about <=10mum particle-diameter is sharply improved. In the dust collector provided with >=2 magnetic poles having plural projections, the powder in the dust contg. gas forcedly introduced by a blower 7 is primarily collected by the magnetic pole 8 having plural projections, and then secondarily collected by the magnetic pole 9 having plural projections, so that the collecting effect for the powder of about <=1mum particle-diameter is remarkably improved.

Description

[Detailed Description of the Invention] A1. Purpose of the Invention [Field of Industrial Application] The present invention relates to a dust collector that magnetically collects powdered magnetic materials such as permanent magnet materials and soft ferrite. be.

[Conventional technology]

Devices for collecting powder having particle diameters in the range of 0.01 μm to 111 μm have been widely put into practical use and are widely used in various fields.

For example, cyclones are the most popular mechanical dust collectors, but they have a limited ability to collect powder smaller than 5 microns. Filter dust collectors such as bag filters can collect powder down to several microns or less depending on the filter selection, but the temperature range in which they can be used is limited (-250°C or less for closing) depending on the material of the filter medium. The structure is complex.

Electrostatic precipitators that use ions generated by electrical discharge are
Although various ultrafine powders of 0.1 μm or less can be collected, Mn-
When collecting soft magnetic ultrafine powder such as Zn-based ferrite, troubles such as abnormal discharge occur, and the collection ability is significantly reduced. Therefore, a method is usually adopted in which various types of dust collectors are used in combination to collect the powder.

However, in the case of powdered magnetic materials, conditions such as high temperature, low non-resistance, and fine powder often overlap.
The equipment for the dust collection section was sometimes found to be too large compared to the equipment for other production areas, making it extremely difficult to select a dust collection device.

[Problem to be solved by the invention]

The present invention relates to a dust collector for collecting powder, most of which is magnetic, and in order to eliminate the drawbacks of various conventional dust collectors, the present invention has a simple structure using magnets or electromagnets, and is easy to process. The purpose is to provide dust equipment.

1. Structure of the invention [Means for solving the problem] As a result of various experiments, the present inventors found that the particle size was 0.0.
It has been found that by using a magnet or an electromagnet, it is possible to effectively collect and recover powdered magnetic substances in the range of 1 μm to 100 μm even during continuous operation. This dust collector has a simple structure and is easy to process, so it is useful in practice.

That is, the present invention provides the following features: 1. In a method of collecting powdered magnetic material, a magnetic pole provided with a plurality of protrusions is arranged in a powder collecting part, and magnetic powder in dust-containing gas is collected by a magnet or an electromagnet. This is a dust collector that is characterized by magnetic collection and collection.

2. A dust collecting device according to claim 1, characterized in that two or more magnetic poles having a plurality of protrusions are arranged in the part where the magnetic material is collected to collect the magnetic material in multiple stages.

[Effect]

In the present invention, in order to effectively collect powdered magnetic material by arranging a magnet or electromagnet in the dust-containing gas introduction pipe,
It is desirable that there is little turbulence in the airflow of the dust-containing gas and that the passing flow rate of the dust-containing airflow is low. For this purpose, the magnetic pole arrangement shown in FIG. 2 is more efficient than the magnetic pole arrangement shown in FIG. 1, and since there are two magnetic poles, the collection rate of magnetic powder is better.

In the present invention, the reason why a plurality of protrusions are provided on the magnetic pole is to increase the dust collection area per unit area of the magnetic pole.

On the other hand, in dust collectors using magnetic poles without protrusions, the dust collection area per unit area of the magnetic pole is small, so the diameter of the dust-containing gas introduction pipe is large, the concentration of dust-containing gas is high, and the passage of dust-containing airflow is difficult. When used under conditions such as high speeds, (1) If the adhesion and accumulation of collected powder progresses excessively as the dust collection time passes, the collected powder will be scattered again and the collection efficiency will decrease.

■It is easy to get overloaded and powder is discharged from the clean gas outlet.

This is because there are major drawbacks such as: On the other hand, when the magnetic pole according to the present invention has a plurality of protrusions, the dust collection area per unit area of the magnetic pole increases, so the probability of contact between the magnetic powder in the dust-containing gas and the magnetic pole increases. Not only the collection efficiency is significantly improved, but also the re-scattering of the collected powder can be prevented. or,
Providing the protrusion concentrates the lines of magnetic force and increases the adsorption force of the magnetic powder, thereby making it possible to prevent re-scattering by the gas flow.

Furthermore, in the present invention, the reason why two or more magnetic poles having a plurality of protrusions are arranged is that when dust-containing gas is forcibly introduced into the dust collector, one magnetic pole will not be enough to recover the repaired powder from the magnetic pole. However, if two or more magnetic poles with multiple protrusions are arranged, the re-dispersed powder can also be collected, improving collection efficiency. This is because it can be achieved.

In the present invention, the powder used is a magnetic material such as a permanent magnet material or a soft ferrite material because powders of other non-magnetic materials cannot be collected by magnets or electromagnets.

〔Example〕

(Example 1) FIG. 1 shows Example 1 of a dust collector in which a magnetic pole having a plurality of protrusions is arranged in a powder collecting section. As shown in FIG. 1, a magnetic pole 1 having a plurality of protrusions was placed at a junction between a dust hopper 2 and a clean gas outlet duct 4. Further, a current plate 5 and a flap 6 are arranged to improve the powder collection effect.

Here, the particle size is 0.01μ! A Sm-Go magnet material having a diameter in the range of 1 to 100 μm was introduced into the dust collector through the dust-containing gas inlet duct 3. Table 1 shows the results of collecting the powder discharged from the clean gas outlet duct 4.

Margin below Table 1 The codes in the table represent the extent of powder recovered.

O: Not observed △: Slightly observed ×2 Clearly observed In the dust collector of the present invention in which a magnetic pole with a plurality of protrusions is arranged in the powder collecting part, it is difficult to collect powder with a particle size of 10 μm or less. The effectiveness has been significantly improved.

(Example 2) FIG. 2 shows Example 2 of a dust collector in which two or more magnetic poles having a plurality of protrusions are arranged. As shown in Fig. 2, the powder in the dust-containing gas forcibly introduced by the blower 7 is first collected by a magnetic pole 8 having a plurality of protrusions, and then secondarily collected by a magnetic pole 9 having a plurality of protrusions. It will be collected.

The collected powder is collected from the dust hopper 2 by stopping the operation of the electromagnet 12. Further, a flap 6 is arranged to improve the powder collection effect.

Here, Mn-Zn ferrite powder having a spinel structure with a particle size in the range of 0.01 μm to 10 μm layer was forcibly introduced into the dust collector using the blower 7, and in order to examine the state of powder collection. The powder discharged from the clean gas outlet duct 4 was collected.

For comparison, the same procedure was carried out for a case in which powder was collected using a dust collector equipped with a single magnetic pole having a plurality of protrusions, and a case in which an electrostatic precipitator was continuously operated. Table 2 shows the results of collecting the powder discharged from the clean gas outlet.

Margin below Table 2 The codes in the table indicate the extent of powder recovered.

O: Not observed △: Slightly observed ×: Clearly observed In dust collectors in which two or more magnetic poles with multiple protrusions are arranged, the powder collection effect for particle diameters of 1 μm or less is significantly improved. ing. As shown in the above embodiments, (1) A magnetic pole having a plurality of protrusions is arranged in the powder collecting section.

(2) Two or more magnetic poles each having a plurality of protrusions are arranged in a region where the magnetic material is collected.

It can be seen that the powdered magnetic material can be effectively collected by this method.

In this example, only 5ad-Co based magnet powder is described as the permanent magnet material powder, but since the present invention utilizes the powder collection effect of a magnet or electromagnet, other magnet materials such as ferrite magnets, Alnico magnet, Fe
It goes without saying that it can also be applied to hard magnetic materials such as -Cr-Co magnets and rare earth magnets including neodymium.

In addition, as an example of the soft magnetic material powder, Mn-Zn ferrite powder having a spinel structure is described, but the soft magnetic material powder targeted by the present invention is not limited to types, and may include Ni-Zn ferrite. It is easy to think that the present invention can be applied to any soft magnetic ferrite such as , Mg ferrite, Li ferrite, magnetite, etc., or to soft magnetic metal powder such as iron powder. Further, although this embodiment describes only the collection of powder by an electromagnet, it is easily possible to apply the present invention even if a device constituted by a magnet is disposed in the collection section. Furthermore, those skilled in the art can easily imagine that the powder collection effect can be expected to be improved by using the dust collector according to the present invention together with various dust collectors such as a cyclone.

C.9 Effects of the Invention [Effects of the Invention] As described above, according to the present invention, in order to eliminate the drawbacks of other types of dust collectors, (1) a magnetic pole having a plurality of protrusions is arranged in the powder collecting section; .

(2) By arranging two or more magnetic poles with multiple protrusions in the part that collects the magnetic material, it is possible to effectively collect a wide range of powdered magnetic materials, and the structure is simple and easy to process. It has become possible to provide a dust collector with the following advantages.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of a dust collector according to the present invention, in which a magnetic pole having a plurality of protrusions is arranged in a powder collecting section. FIG. 2 is a side sectional view of a dust collector in which two or more magnetic poles having a plurality of protrusions are arranged according to the present invention. DESCRIPTION OF SYMBOLS 1... Magnetic pole with multiple protrusions, 2... Dust hopper 3... Dust-containing gas inlet duct, 4... Clean gas outlet duct, 5... Straightening plate, 6... Flap, 7 ...
Blower 18... Magnetic pole (primary collection side), 9... Magnetic pole (secondary collection side), 10... Slide valve, 11... Powder collection container, 12... Electromagnet. Patent applicant Tokin Co., Ltd. Figure 2

Claims (1)

[Claims] 1. In a method of collecting powdered magnetic material, a magnetic pole provided with a plurality of protrusions is arranged in the powder collecting part, and the magnetic powder in dust-containing gas is collected by a magnet or an electromagnet. A dust collector characterized by magnetic collection and collection. 2. The dust collecting device according to claim 1, wherein two or more magnetic poles each having a plurality of protrusions are arranged in the part where the magnetic material is collected to collect the magnetic material in multiple stages.