JPH08294675A - Box-shaped fluidized bed type classifier - Google Patents

Abstract

PURPOSE: To provide a box-shaped fluidized bed type classifier excellent in classifying capacity, capable of being reduced in size, reduced in abrasion and conserved in maintenance labor. CONSTITUTION: A box-shaped fluidizied bed type classifier has a classifier main body 11 having required height and extended in a lateral direction and the screw conveyor 12 arranged in the vicinity of the bottom part of the main body 11 to feed a powder A from an upstream part 12a to a downstream part 12b. A buffle plate 14 is provided above the conveyor 12 within the main body to demarcate the interior of the main body 11 into an upstream powder supply chamber 15 and a downstream fluidized bed chamber 16 and a fine particle taking-out chamber 23 of which the upper part communicates with the chamber 16 by a classification regulating plate 22 is formed to the side part of the chamber 16. Further, the fine particle taking-out port formed to the bottom part of the chamber 23, the exhaust port 26 formed to the upper part of the main body 11 so as to communicate with the chambers 16, 23, the air diffusion plate 19 formed to the bottom part of the chamber 16, the air introducing chamber 21 formed below the air diffusion plate 19 and a coarse particle taking-out port 30 formed to the bottom part of the chamber 16 at the end part position on the downstream side 12b of the conveyor 12 are provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a box type fluidized bed type classifier.

[0002]

2. Description of the Related Art Generally, in an apparatus for producing cement or the like, a cement raw material such as cement clinker is preliminarily pulverized by a premill such as a vertical mill or a crusher,
The raw material of the preliminarily crushed powder is sent to a classifier to be classified into fine particles and coarse particles, and then the coarse particles are returned to the preliminary crusher for crushing and the fine particles are sent to a main crusher such as a ball mill. It is further pulverized in order to obtain the fine powder that becomes the product.

Conventionally, as a classifier used in such an apparatus, there is a sieve type classifier 1 as shown in FIG. 6, and the sieve type classifier 1 has a powder / granule introduction port 2 in the upper part. In the classifier body 3, a sieve 4 slanted in a downward gradient is provided in multiple stages (5 in FIG. 6) so that the mesh of the sieve 4 gradually becomes smaller toward the lower stage.
A fine particle distribution chamber 5 which is disposed in the lowermost stage 4 and is inclined in the same direction as the sieve 4 and which is communicated with the fine particle distribution chamber 5 at the lower end of the fine particle distribution chamber 5. An outlet 6 is provided, a coarse-grained flow chamber 7 is formed on the side of the lower end of each of the sieves 4, and a coarse-grained outlet 8 that communicates with the coarse-grain flow chamber 7 is provided. A vibration generator 9 for vibrating the sieve 4 is provided.

In the sieve type classifier 1 described above, the granular material A preliminarily pulverized by the preliminary pulverizer (not shown) is introduced from the granular material inlet 2 and each sieve 4 is moved by the vibration generator 9. When vibrated, first, only the granular material A that cannot pass through the coarsest mesh 4 of the uppermost stage remains on the sieve 4, and those having a particle size smaller than that fall onto the lower sieve 4 and this action Is sequentially repeated in each sieve 4, and only the fine particles B are dropped from the lowermost sieve 4. The fine particles B dropped from the lowermost sieve 4 pass through the fine particle flow chamber 5 and the fine particle outlet 6 Is sent to a main crusher (not shown) and crushed. Further, the coarse particles C, which have moved toward the lower end side by vibration on the sieve 4 without dropping from the mesh of each sieve 4, drop into the coarse particle flow chamber 7 and are sent from the coarse particle outlet 8 to the preliminary crusher. It is pre-crushed again.

[0005]

However, in the case of the conventional sieve type classifier 1, when the powder particles A to be classified are highly abrasive such as cement clinker, each is vibrated by the vibration generator 9. Due to continuous collision between the sieve 4 and the granular material A, the respective sieves 4 are severely worn. Therefore, it is necessary to replace each sieve 4 frequently (about once every two months), and this replacement work is difficult. Therefore, the maintenance is troublesome, and the classification efficiency is poor because the classification work must be stopped at the time of maintenance. In addition, the classification by the sieve 4 is apt to cause clogging, resulting in poor classification efficiency and a large amount of powder. In order to process the granules A, there is a problem that the device becomes very large, and further, there is a problem that the vibration of the classifier body 3 by the vibration generating device 9 adversely affects other peripheral devices.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a box-type fluidized bed type classifier which is excellent in classifying performance, can be downsized, and has little wear and maintenance. It is a thing.

[0007]

A box-type fluidized bed classifier according to the present invention has a classifier body which has a required height and extends in the lateral direction, and a classifier body which is disposed near the bottom of the classifier body. A screw conveyor that conveys the powder particles from the upstream side to the other end downstream side, and the inside of the classifier body provided on the upper side of the screw conveyor in the classifier body, the powder particle supply chamber upstream and the fluidized bed downstream A baffle plate that divides the chamber into a chamber, a fine particle take-out chamber formed on the side of the fluidized bed chamber by communicating the upper part with the fluidized bed chamber by a classification control plate, and a fine particle take-out port formed at the bottom of the fine particle take-out chamber. An exhaust port formed in an upper portion in communication with the fluidized bed chamber and the fine particle extraction chamber, an air diffuser plate formed in a bottom portion of the fluidized bed chamber, and an air introduction chamber formed below the air diffuser plate, Formed at the downstream end of the screw conveyor at the bottom of the fluidized bed chamber. It is characterized by comprising the a coarse grain outlet.

Further, the height position of the classification adjusting plate can be adjusted up and down.

A fine particle take-out chamber is formed on the downstream side of the fluidized bed chamber.

[0010]

In the present invention, the powder or granular material supplied to the powder or granular material supply chamber is quantitatively supplied to the fluidized bed chamber by the driving of the screw conveyor, and the whole surface of the bottom portion is supplied from the air introducing chamber through the diffuser plate. It is fluidized by the air jetted substantially uniformly from the above to form a fluidized bed in which the upper layer is fine particles and the lower layer is coarse particles.

The fine particles on the upper part of the fluidized bed pass over the classification control plate and flow into the fine particle extraction chamber formed on the side part of the fluidized bed chamber, and are taken out from the fine particle extraction port to the outside, and also on the lower part of the fluidized bed. The coarse particles are conveyed to the downstream side by a screw conveyor while flowing, and are taken out to the outside from the coarse particle outlet at the downstream end.

At this time, the powder and granular material supply chamber is air-locked with the fluidized bed chamber by the baffle plate, and the powder and granular material in the powdery and granular material supply chamber is quantitatively supplied to the fluidized bed chamber by the operation of the screw conveyor. Since it is like this,
It is possible to always form a stable fluidized bed in the fluidized bed chamber, and therefore, it is possible to improve the accuracy of the particle size of the fine particles that are classified by surpassing the classification control plate, and exhibit high classification performance,
Moreover, it is possible to classify a large amount of powder and granules continuously,
The device can be downsized.

Further, since the fluidized bed has a particle diameter that gradually increases from the upper side to the lower side, it is possible to easily adjust the particle sizes of fine particles and coarse particles to be separated by adjusting the vertical position of the classification adjusting plate. it can.

Further, since the fluidized bed becomes more stable toward the downstream side, if the fine particle take-out chamber is formed on the downstream side of the fluidized bed chamber, classification with higher accuracy becomes possible.

[0015]

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

1 to 3 show one embodiment of the box type fluidized bed type classifier of the present invention. The box type fluidized bed type classifier 1 is shown in FIG.
0 is provided with a classifier body 11 having a required height and formed in an elongated shape in the lateral direction (left and right direction in FIGS. 1 and 3), and its length is provided near the bottom of the classifier body 11. The screw conveyor 12 is arranged along the vertical direction, and the powder A is directed from the one upstream side 12a to the other downstream side 12b of the screw conveyor 12 by rotationally driving the screw conveyor 12 by the rotary drive device 13. It is designed to be transported.

A baffle plate 14 having a lower end in proximity to the screw conveyor 12 is provided above the upstream side 12a of the screw conveyor 12 in the classifier body 11 so that the inside of the classifier body 11 is provided with a granular material supply chamber 15 And a fluidized bed chamber 16 downstream.

A powder hopper 18 is connected to an upper portion of the powder supply chamber 15 through a powder receiving port 17.

The fluidized bed chamber 16 has a diffuser plate 19 made of a perforated plate, a mesh material, felt or the like arranged at the bottom thereof, and air 20 for flowing is introduced below the diffuser plate 19. An air introducing chamber 21 is formed.

On the side portion of the fluidized bed chamber 16 (the side portion on the downstream side 12b in FIGS. 1 and 3), a fine particle take-out chamber 23 is formed by a classification adjusting plate 22 and only the upper portion communicates with the fluidized bed chamber 16. is there. The horizontal upper side 22a of the classification adjusting plate 22 extends to a required height position, and the fluidized bed chamber 16 and the fine particle take-out chamber 23 are connected to each other by the communicating portion S on the upper side of the upper side 22a. Further, at the bottom of the fine particle take-out chamber 23, a fine particle take-out port 25 having a rotary valve 24 capable of cutting out the fine particles B while maintaining airtightness is formed.

The upper parts of the fluidized bed chamber 16 and the fine particle take-out chamber 23 are communicated with an exhaust port 26, which is connected to a fine powder collecting device 28 which is sucked by a suction fan 27. The air in the layer chamber 16 and the fine particle extraction chamber 23 is sucked, and the fine powder contained in the exhaust gas is collected.

At the position of the downstream side 12b of the screw conveyor 12 at the bottom of the fluidized bed chamber 16, a rotary valve 2 capable of cutting out coarse particles C while maintaining airtightness.
9 is provided.

Further, in FIG. 2, the classification adjusting plate 2
The lower end of 2 is projected downward so that the vertical position can be adjusted by bolts 31 or the like on the side surface or the like of the air introduction chamber 21.

The operation of the above embodiment will be described.

The granular material A preliminarily crushed by a preliminary crusher (not shown) and temporarily stored in the granular material hopper 18 is
The powder is supplied to the powder supply chamber 15 through the powder receiving port 17.

As described above, the granular material A supplied to the granular material supply chamber 15 is rotated from the upstream side 12a to the fluidized bed chamber 16 by the rotation of the screw conveyor 12 by the operation of the rotary drive device 13. A fixed amount is supplied toward the downstream side 12b.

The granular material A supplied to the fluidized bed chamber 16 is fluidized by the air 20 ejected from the air introduction chamber 21 through the diffuser plate 19 substantially uniformly from the entire bottom surface toward the upper side, The upper layer is a fine particle B, and the lower layer is a coarse particle C. At this time, since the powder and granular material supply chamber 15 and the fluidized bed chamber 16 are air-locked by the baffle plate 14, a stable fluidized bed is formed in the fluidized bed chamber 16.

Furthermore, since a fine particle extraction chamber 23 is formed on the side of the fluidized-bed chamber 16 and is partitioned by the classification adjusting plate 22 and the upper part is communicated by the communicating portion S, the fine particles B on the upper part of the fluidized bed are classified and adjusted. The fine particles B flow over the upper side 22a of the plate 22 and flow into the fine particle extraction chamber 23, and only the fine particles B are extracted from the fine particle extraction port 25 to the outside through the rotary valve 24.

The coarse particles C in the fluidized-bed chamber 16 are conveyed toward the downstream side 12b by the screw conveyor while flowing on the diffuser plate 19 at the bottom of the fluidized-bed chamber 16, and the downstream side 1
It is taken out to the outside through a rotary valve 29 from a coarse particle take-out port 30 provided at the end of 2b.

As described above, since the powder and granular material supply chamber 15 and the fluidized bed chamber 16 are air-locked by the baffle plate 14, the fluctuation of the pressure in the powdery and granular material supply chamber 15 is caused in the fluidized bed chamber 16. Since the powder A can be prevented from being transmitted and the powder A in the powder supply chamber 15 is quantitatively supplied to the fluidized bed chamber 16 by the screw conveyor 12, a stable fluidized bed can be provided in the fluidized bed chamber 16. Therefore, it is possible to improve the particle size accuracy of the fine particles B to be classified by passing over the classification adjusting plate 22 and flowing into the fine particle extracting chamber 23, and exhibit high classification performance. Further, since the fluidized bed can be stably formed, it is possible to easily process a large amount of powdery particles A continuously, and the apparatus can be downsized.

Further, since the fluidized bed forms a distribution in which the particle diameter gradually increases from the upper side to the lower side,
By adjusting the vertical position of the classification adjusting plate 22 with the bolt 31, the particle size of the fine particles B and the coarse particles C to be separated can be arbitrarily adjusted. The distribution of particles in the fluidized bed at this time must be constant at the point of separation, so the amount of air supplied to the air introduction chamber 21 is grasped by the pressure, and this pressure is generally constant. Is preferred.

The fine particle take-out chamber 23 may be formed on the entire side portion of the fluidized bed chamber 16, but since the fluidized bed becomes more stable toward the downstream side 12b, the fine particle take-out chamber 2
3 is formed on the side of the downstream side 12b of the fluidized bed chamber 16,
The fine particles B can be classified more accurately.

FIG. 4 shows a case where the lower end of the classification adjusting plate 22 is extended downward and a vertical position adjusting device 32 such as a cylinder is installed at the lower end of the classification adjusting plate 22. According to the above, by adjusting the height of the classification adjusting plate 22 by the vertical position adjusting device 32, the particle size for classification can be easily adjusted remotely.

Further, in FIG. 5, a narrow rotating plate 33 is rotatably attached to the upper side of the fixed classification adjusting plate 22 via a shaft 34, and the shaft 34 is rotated outside the classifier body 11. A drive device 35 such as a motor is installed. According to this configuration, the drive device 35 rotates the rotating plate 33 to change the height position of the end portion of the rotating plate 33. The particle size for classification can be easily adjusted remotely. At this time, as a method of rotating the rotating plate 33, a driving device other than a motor or a manual rotating method may be adopted.

[0035]

In the present invention, the baffle plate is used to airlock the powder and granular material supply chamber and the fluidized bed chamber to prevent the fluctuation of the pressure in the powdery and granular material supply chamber from being transmitted to the fluidized bed chamber. Moreover, since the powder and granular material in the powder and granular material supply chamber is quantitatively supplied to the fluidized bed chamber by the screw conveyor, it is possible to form a stable fluidized bed in the fluidized bed chamber, and thus to overcome the classification control plate. The accuracy of the particle size of the fine particles classified by flowing into the fine particle extraction chamber can be improved.

Further, since a stable fluidized bed is formed and classification is performed, a large amount of powder and granules can be continuously and efficiently treated as compared with the conventional sieve type classifier, and abrasion is prevented. Is less likely to occur and maintenance is easy.

By changing the height position of the upper side of the classification adjusting plate, the particle size for classification can be easily adjusted remotely.

Since the fluidized bed formed in the fluidized bed chamber is more stable in the downstream side, if the fine particle take-out chamber is formed on the downstream side of the fluidized bed chamber, highly accurate classification can be performed.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view showing an embodiment of a box type fluidized bed type classifier of the present invention.

FIG. 2 is a view taken along the line II-II of FIG.

FIG. 3 is a view taken in the direction of arrows III-III in FIG. 1;

FIG. 4 is a front view showing an embodiment of a system for adjusting the height position of a classification adjusting plate.

FIG. 5 is a front view showing another embodiment of the system for adjusting the height position of the classification adjusting plate.

FIG. 6 is a vertical cross-sectional view showing an example of a sieve type classifier used conventionally.

[Explanation of symbols]

 10 box type fluidized bed type classifier 11 classifier body 12 screw conveyor 12a upstream side 12b downstream side 14 baffle plate 15 powder and granules supply chamber 16 fluidized bed chamber 19 air diffuser plate 21 air introduction chamber 22 classification control plate 23 fine particle extraction chamber 25 Fine Grain Outlet 26 Exhaust Port 30 Coarse Grain Outlet 33 Rotating Plate A Powder Granule B Fine Grain C Coarse Grain

Claims (3)

[Claims] 1. A classifier body having a required height and extending in the lateral direction, and a classifier body disposed near the bottom of the classifier body to convey the granular material from one end upstream side to the other end downstream side. A screw conveyor, a baffle plate that is provided on the upper side of the screw conveyor in the classifier body and divides the classifier body into an upstream granular material supply chamber and a downstream fluidized bed chamber, and a side portion of the fluidized bed chamber. A fine particle take-out chamber formed by communicating the upper part with a fluidized bed chamber by a classifying plate, a fine particle take-out port formed at the bottom of the fine particle take-out chamber, and an upper part communicating with the fluidized bed chamber and the fine particle take-out chamber. Formed exhaust port, a diffuser plate formed at the bottom of the fluidized bed chamber, an air introduction chamber formed below the diffuser plate, and a downstream end position of the screw conveyor at the bottom of the fluidized bed chamber. Box type characterized by having a coarse grain outlet Fluidized bed classifier. 2. The box-type fluidized bed classifier according to claim 1, wherein the height position of the classifying plate is vertically adjustable. 3. The box-type fluidized bed classifier according to claim 1, wherein the fine particle take-out chamber is formed on the downstream side of the fluidized bed chamber.