JP2877799B1 - Particle classifier - Google Patents

Abstract

An object of the present invention is to provide a highly durable particle classifier capable of efficiently classifying high-temperature particles. A flat plate (1) made of a heat-resistant material having a large number of inclined grooves (2) extending in an oblique direction is installed at an inclination angle (α) from a horizontal plane. An upper part of the flat plate 1 is provided with a particle input section 6, and a lower part thereof is provided with a coarse particle recovery section 7 and a fine particle recovery section 8 which falls along the inclined groove 2. Since classification using the flat plate 2 can be performed, particles having a high temperature of 900 to 1000 ° C. can be continuously and efficiently classified.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for classifying particles, and more particularly to an apparatus for classifying particles suitable for classifying high-temperature particles which cannot be used with ordinary classifiers.

[0002]

2. Description of the Related Art For example, when granulated incinerated ash is put into a fluidized incinerator to produce granulated sintered ash, the particle size is 5 m.
It is preferable that the granulated sintered ash of about m is separated from a fluid medium having an average particle diameter of 0.3 to 0.4 mm at a high temperature of 900 to 1000 ° C., and the fluid medium is returned to the furnace. A sieve is usually used to classify a mixture of coarse particles and fine particles, but even if the mesh of the sieve is made of a refractory metal, if such high-temperature particles are brought into contact, they will be damaged in a short time. Particles could not be classified. Although air classification can be used for high-temperature particles, there are problems that the processing capacity is very low and that heat loss is increased because the particles are cooled by air.

[0003]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned conventional problems and classifies high-temperature particles which cannot be used by conventional sieves efficiently and has excellent durability. It was made to provide a device.

[0004]

In order to solve the above-mentioned problem, a particle classifying apparatus is provided in which a flat plate having a large number of inclined grooves extending in an oblique direction is installed so as to be inclined downward from a horizontal plane, and the upper part thereof is provided. Is provided with a particle input section, and a recovery section for coarse particles falling directly below the input section and a recovery section for fine particles falling along the inclined groove are provided below the input section. It is.

[0005] It is preferable to provide a separation gate between the collecting section for the coarse particles and the collecting section for the fine particles, and to provide a guard provided on the upper surface of the flat plate with a gap on the flat plate side which does not hinder the passage of the fine particles. Is preferred. Further, the inclination angle of the flat plate with respect to the horizontal plane is set to a value that is larger than the angle of repose of the particles to be classified by 12.5 to 17.5 °, and the groove angle formed by the inclined groove of the flat plate with respect to the horizontal plane, the repose angle of the particles to be classified Is preferably set to a value 20 to 25 ° larger than the angle of the object having the larger value.

[0006] The particle classification apparatus of the present invention is designed to drop particles along the surface of a flat plate, and to cause fine particles to fall obliquely by the inclined grooves, but coarse particles to fall vertically while climbing over the inclined grooves. Use and classify. Therefore, if the flat plate is made of a heat-resistant material such as ceramics, 900
High temperature particles of ~ 1000 ° C can be classified continuously and efficiently.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below. FIG. 1 is a perspective view of a classification device of the present invention, FIG. 2 is a front view thereof, and FIG. 3 is a side view thereof. In these figures, 1 is a flat plate made of a heat-resistant material such as ceramic,
A large number of inclined grooves 2 extending in an oblique direction are formed on the surface. Even if the inclined groove 2 is formed by attaching a ridge 3 to the surface of the flat plate 1 as shown in FIG.
As shown in FIG. 4 (B), even when formed by laminating many thin plates 4 having different heights, they are formed by cutting slits 5 in the surface of the flat plate 1 as shown in FIG. 4 (C). You may.

It is assumed that the depth of the inclined groove 2 is larger than the diameter of the fine particles in the particles to be classified and smaller than the diameter of the coarse particles. In the example below, coarse particles with an average particle size of about 5 mm and a repose angle of 37.5 °, and an average particle size of 0.3 to 0.4 mm
The classification with fine particles having an angle of repose of 35 ° was performed using a flat plate 1 in which both the depth and width of the inclined groove 2 were 2 mm.

The flat plate 1 having such an inclined groove 2 is shown in FIG.
As shown in the figure, it is installed inclined downward from the horizontal plane. The inclination angle α is about 45 to 60 °, and in the data of the examples described later, the optimum is 50 to 55 °, which is 12.5 to 17.5 ° larger than the repose angle of coarse particles having a large repose angle.
However, the inclination angle α can be set as appropriate. In addition, the angle β of the inclined groove of the flat plate with respect to the horizontal plane is 55 to 65 °
57.5 to 62.5 ° was optimal in the data of Examples described later, and was a value 20 to 25 ° larger than the angle of repose of the coarse particles. However, since these angles depend on the angle of repose of the particles to be classified, they should be determined according to the type of the particles.

On one side of the upper part of the flat plate 1, a particle input section 6 is provided, and particles in which coarse particles and fine particles are mixed are input. The fine particles fall into the inclined groove 2 of the flat plate 1 and fall obliquely along the inclined groove 2, but the coarse particles fall vertically while climbing over the inclined groove 2 because they are larger than the inclined groove 2. Done. At the lower part of the flat plate 1, there are provided a collecting section 7 for coarse particles falling just below the input section 6 and a collecting section 8 for fine particles falling along the inclined groove 2. It is preferable to provide an isolation gate 9 between them.

However, if only such an inclined groove 2 is provided, a part of the coarse particles may collide with the side surface of the inclined groove 2 and jump off, and may enter the collecting section 8 for the fine particles. Therefore, a guard 11 having a gap 10 which does not hinder the passage of the fine particles is provided above the separation gate 9 on the side of the flat plate 1 to prevent the jumping coarse particles from climbing over the guard 11 and entering the collection part 8 of the fine particles. Is preferred. Although the guard 11 is shown vertically in FIGS. 1 and 2, the guard 11 may be inclined in a direction perpendicular to the inclined groove 2.

As described above, the classification device of the present invention uses the flat plate 1
When the flat plate 1 is made of a heat resistant material, particles having a high temperature of 900 to 1000 ° C. can be continuously and efficiently classified. The following examples of the present invention are shown.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Using a classifier having the shape shown in FIG. 1, the inclination angle α, groove angle β, width A of the separation gate 9 and height H of the gap 10 of the guard 11 are variously changed, and the mixing ratio (coarse) The mixing ratio of the fine particles into the collecting portion 7 of the particles and the mixing ratio of the coarse particles into the collecting portion 8 of the fine particles were tested. The particles used in the test consisted of 5 kg of granulated sintered ash having an average particle size of 5 mm and a repose angle of 37.5 ° mixed with 10 kg of silica sand having an average particle size of 0.3 to 0.4 mm and a repose angle of 35 °. The width and depth of 2 were each 2 mm.

FIG. 5 is a graph showing the relationship between the inclination angle α and the mixing ratio. However, the groove angle β is 60 ° and the separation gate 9
Has a width A of 250 mm. As shown, the inclination angle α is 45 °
If the inclination angle α exceeds 60 °, the fine particles climb over the inclined groove 2 and fall into the collecting part 7 for coarse particles, so that the mixing ratio of the fine particles increases. In this example, the most preferable result was obtained when the inclination angle α was 50 to 55 °.

FIG. 6 is a graph showing the relationship between the groove angle β and the mixing ratio. However, the inclination angle α is 52.5 ° and the separation gate 9
Has a width A of 200 mm. As shown, the groove angle β is 57.5
The most favorable results were obtained when the angle was set to 662.5 °.

FIG. 7 is a graph showing the relationship between the width A of the separation gate 9 and the mixing ratio. However, the inclination angle α is 52.5 °,
The groove angle β was 60 °. When the width A of the separation gate 9 is reduced, the mixing ratio of coarse particles into the collection unit 8 of fine particles increases,
Conversely, when the width A of the separation gate 9 is increased, the mixing ratio of the fine particles into the collection unit 7 for the coarse particles increases. Therefore, it is preferable to adjust the width A of the separation gate 9 according to the purpose of classification.

FIG. 8 is a graph showing the relationship between the longitudinal length L of the flat plate 1 and the mixing ratio. However, the inclination angle α is 52.5
°, the groove angle β was 60 °, and the width A of the separation gate 9 was 100 mm. When the length L is increased, the mixing ratio of the fine particles into the collection part 7 of the coarse particles is reduced, but it cannot be completely reduced to zero.

FIG. 9 shows the height H of the gap 10 of the separation gate 9.
6 is a graph showing the relationship between the ratio and the mixing ratio. Where inclination angle α
Is 52.5 °, the groove angle β is 60 °, and the width A of the separation gate 9 is 100 m.
m, and the length L in the vertical direction of the flat plate 1 was 1200 mm. By providing the separation gate 9, the mixing ratio of the coarse particles into the collection part 8 of the fine particles was greatly improved. However, since a part of the fine particles also collides with the separation gate 9, the mixing ratio of the fine particles into the collection part 7 of the coarse particles is slightly increased.

FIG. 10 is a graph showing the relationship between the width B of the charging section 6 and the mixing ratio. However, the inclination angle α was 52.5 °, the groove angle β was 60 °, the width A of the separation gate 9 was 100 mm, the longitudinal length L of the flat plate 1 was 1200 mm, and the height H of the gap 10 was 2 mm. By appropriately selecting the width B of the charging section 6, the mixing ratio of fine particles to the collecting section 7 for coarse particles and the mixing rate of coarse particles to the collecting section 8 for fine particles are both low levels of 1.7 to 1.8%. It was confirmed that it could be suppressed.

[0020]

As described above, the particle classification apparatus of the present invention can classify coarse particles and fine particles using a flat plate provided with inclined grooves. Therefore, if the flat plate is made of a heat-resistant material, there is an advantage that particles having a high temperature of 900 to 1000 ° C. can be continuously and efficiently classified.

[Brief description of the drawings]

FIG. 1 is a perspective view of a classification device of the present invention.

FIG. 2 is a front view of the classification device of the present invention.

FIG. 3 is a side view of the classification device of the present invention.

FIG. 4 is a sectional view of a flat plate.

FIG. 5 is a graph showing the relationship between the inclination angle α and the mixing ratio.

FIG. 6 is a graph showing a relationship between a groove angle β and a mixing ratio.

FIG. 7 is a graph showing a relationship between a separation gate width A and a mixing ratio.

FIG. 8 is a graph showing the relationship between the length L of the flat plate in the vertical direction and the mixing ratio.

FIG. 9 is a graph showing the relationship between the height H of the gap of the separation gate and the mixing ratio.

FIG. 10 is a graph showing the relationship between the width B of the charging section and the mixing ratio.

[Explanation of symbols]

Reference Signs List 1 flat plate, 2 inclined grooves, 3 ridges, 4 thin plates, 5 slits, 6 particle input section, 7 coarse particle recovery section, 8
Collection unit for fine particles, 9 separation gate, 10 gap, 11
Guard, α inclination angle, β groove angle, A separation gate width, B input part width, H separation gate clearance height, L
Vertical length of flat plate

Claims (5)

(57) [Claims] 1. A flat plate provided with a large number of inclined grooves extending in an oblique direction is installed so as to be inclined downward from a horizontal plane, an input portion for particles is provided at an upper portion thereof, and a drop portion directly below the input portion is provided at a lower portion thereof. A particle classification device, comprising: a collection section for coarse particles to be collected; and a collection section for fine particles falling along an inclined groove. 2. The particle classification apparatus according to claim 1, wherein a separation gate is provided between the collection section for the coarse particles and the collection section for the fine particles. 3. A guard provided on the upper surface of the flat plate with a gap on the side of the flat plate that does not hinder the passage of fine particles.
3. The particle classification device according to 1.). 4. The angle of inclination of the flat plate with respect to the horizontal plane is 12.5 to 17.5 ° larger than the angle of the particle having a large angle of repose.
The particle classification apparatus according to any one of claims 1 to 3, wherein the apparatus has a large value. 5. The angle of a groove formed by an inclined groove of a flat plate with respect to a horizontal plane is larger than that of a particle having a large angle of repose of particles to be classified.
The particle classification device according to any one of claims 1 to 4, wherein the value is set to a value larger by 20 to 25 °.