JPH05146758A - Dynamic separator - Google Patents

Abstract

PURPOSE: To provide a dynamic separator which contributes to an improvement in the quality of sized pulverulent materials and is high in efficiency. CONSTITUTION: A pair of rotary drums 3 and 6 are arranged in series one above the other so as to be traversed by separating air streams 12 and 14 and are provided with spiral ducts 4, 7, 5 and 8 with their inlets and outlets tangential to the respective rotary drums in such a manner that the air streams 12 and 14 discretely supplied toward the respective rotary drums traverse the respective rotary drums in order to separate the pulverulent materials 11, such as cement. When the air streams passing the respective rotary drums leave from the duct in the tangential direction of the rotary drum 3 in the upper part, a fraction 13 of fine particles corresponding to a first final product and a fraction of the particles coarse than the same are formed. The fraction of the coarse particles enter the rotary drum 6 of the lower part and when leaving from its duct, the fraction 15 corresponding to a second final product and the fraction 17 of the separate coarse grain size are formed. The fractions of three kinds in grain sizes are formed as a whole in the end.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a dynamic separation of powder material, especially cement, which comprises a selector in the form of a drum rotating about a vertical axis and a plurality of selector vanes mounted on its periphery. It is related to vessels.

[0002]

2. Description of the Related Art In a separator of this type, a material to be separated is sent to a selector to be dispersed therein, and the material is dropped on the peripheral edge of the side surface of a drum traversed by a separating air stream. The final product (especially cement) is collected in a cyclone or a filter by entraining it in the air flow through the drum. The particle size of the final product depends on various parameters. The larger the flow rate of the airflow passing through the drum selector, in other words, the faster the flow velocity, the coarser the particle size,
The fineness of the product is reduced. Further, if the flow velocity of the airflow passing through is the same, when the peripheral velocity of the selector drum is increased, coarser particles are removed and a finer product is obtained.
Similarly, if the peripheral velocity of the drum is equal, coarser particles will be removed and a finer product will be obtained even if the number of selector blades attached to the peripheral edge of the drum is increased.

These devices are characterized by a high degree of precision in their sizing, so that the product has a narrower particle size distribution than that obtained with older design separators. The crushing equipment using such a separator mainly comprises a roller crusher, and this equipment itself produces a material having very few fine particles, that is, a material having a narrower particle size distribution to be separated. When it does, problems occur. The product obtained in this case is unpopular with the user. This is because solidification is too fast and workability is poor.

One way to overcome this problem is to lower the sizing point of the separator. However, while this increases the efficiency of the entire crushing facility that connects the separators, it just abandons the advantages of these devices. The other method is 2
The production of two products with different particle sizes, in this case cement, in one juxtaposed facility and then mixing these products in suitable proportions to change the final particle size distribution. However, providing a system for dividing the material to be sent along two parallel lines is expensive to install. Further, there is a problem of space for accommodating two lines, and it is difficult to incorporate these lines into existing equipment.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to effectively solve the problem of the particle size distribution curve of products, that is, the problem of product quality, which has been a problem in the prior art, and further, the separator of the rotary drum selector type. To obtain a dynamic separator that does not reduce the high efficiency of.

In order to solve this problem, the dynamic separator of the present invention has a rotary drum incorporated so that an air flow of air acting as a separation medium is traversed, especially in a dynamic separator of a powder material such as cement. And a pair of rotating drums separately disposed in series with each other, and an inlet and an outlet are provided so that the air streams separately supplied to each of the rotating drums in the dynamic separator cross each of the rotating drums. A spiral duct, each of which is tangential to each of the rotary drums, is provided, and two fractions of distinct particle size of fine particles leaving the ducts of the tangential direction due to the air flow passing through each rotary drum; It is characterized by forming a coarse particle fraction that descends in the vessel, and finally forming three fractions having different particle sizes as a whole.

The three fractions having different particle sizes are formed here by first producing a fraction corresponding to the first final product in the upper rotary drum and a fraction coarser than the first final product. Enters the lower rotary drum and produces a fraction corresponding to the second final product and a fraction coarser than the second final product, so that eventually three fractions having different particle sizes are formed. The present invention will be described with reference to the drawings.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENT The separator of FIG. 1 comprises a generally cylindrical body traversed by the vertical axis of a shaft 19 having a variable speed drive 10. The shaft 19 rigidly supports and rotates the pair of separating rotary drums 3 and 6. One of these separation rotary drums 3 and 6 is vertically stacked on the other and arranged in series in the separator. These drums support a plurality of selector blades, which are arranged in the radial direction or tilted, on the peripheral edge. The purpose of these selector blades is to feed the upper drum 3 through the vertical feed tube 1.
Is to separate the material sent to and to drop the separated material circumferentially on the side of the drum in the area of the vanes. Two
An upper stator 31 and a lower stator 36 are provided on the outside of each of the drums 3 and 6 for these drums. These stators include a plurality of vanes. The purpose of this vane is to generate a tangential component in the separated air flow. In the illustrated embodiment, a first separating air stream with a flow rate P1 is sent to the top of this separator through a tangential inlet duct 4, which is shown as spiral or spiral. First air stream fraction 1 which is a part of air stream containing powder
3 leaves the duct 5 in the area above the drum 3.

The lower drum 6 is separated from the upper drum 3 by the conical plate 42, the base 43 and the rim 16 and is sealed to the upper drum 3. This also extends in a spiral shape and passes through the introduction duct 7 tangential to the drum (flow rate P2
The second separating air stream 14 is sent to the area below this separator and leaves the delivery duct 8 as a second air stream portion 15 which is part of the air stream containing the powder. The bottom of the separator is provided with a discharge hopper 9 for the coarser material 17 to be removed, which discharges the coarser material 17 from the area outside the second drum or drum 6 through the bottom of the separator. The drum 6 is supported on the shaft 19 via radial arms 44.

The principle of operation of the separator shown in FIG. 1 is basically as follows. The material 11 to be separated is fed to this separator via the feed pipe 1 and is dispersed by the top 2 of the rotating drum 3. The first separation airflow 12 is sent to the tangential introduction duct 4, the first separation airflow 12 is passed through the material 11 dispersed by the rotating drum 3, and these are sent out from the delivery duct 5 as an airflow 13 containing powder. The material floating in this first air stream fraction 13 is
9 means the first finished product or first final product selected by the drum 3 driven at variable speed by 9. The coarser material 17 falls from an area outside the drum 3 onto the rim 16 and then in front of the separating rotary drum 6. The drum 6 can be different in its diameter, height and number of blades compared to the drum 3 depending on the desired roughness of the product. The second separation airflow 14 sent into the tangential introduction duct 7 is traversed by the coarser material 17 and sent out from the delivery duct 5 as a second airflow fraction 15 which is an airflow containing powder.

The material floating in the second air flow portion 15 means the second end product. Since the diameter of the second drum and the flow rate of the second separation airflow 14 are different from those of the first drum, the particle size of the second final product is different from the particle size of the first final product. The removed coarse material 17 is discharged from the lower discharge hopper 9 and sent to a crusher for further crushing for reuse.

The separator shown in FIG. 2 has the same principle of operation as the separator of FIG. 1, except that a suitable variable speed drive 18 acting on the second shaft 19 'causes the upper drum 3 to move.
That is, it is easy to change the rotation speed of the lower drum 6 separately from the rotation speed of.

FIG. 6 shows one possible form of grinding equipment using the separator shown in FIG. In FIG. 6, the material 26 to be separated is transferred by the elevator 27 from the grinder 25 to the separator 28. The air 29 from the dust collecting step of the crusher 25 is used as the separating air flow for the upper stage of the separator 28, but the atmosphere 30 is also used if necessary. The air 13 leaving the upper stage of the separator 28 is sent to the filter 32,
It is discharged through the vertical cylinder 33. The first product 34 is collected at the bottom of this filter 32.

The separating air 35 in the lower stage of the separator 28 leaves the separator as the powder-containing air 15, the powder is removed by the cyclone 37, and the air 15 is sent to the separator 28 by the fan 49 for reuse. It The second product 38 is discharged from the cyclone. The granularity of the two products 34, 38 can be adjusted by changing the rotation speed of the drum by the drive device 10 and changing the flow rates of the separated air flows 29, 30, 35 by the flow rate control devices 39, 40. .. The separated coarser material 17 is returned to the grinder for further grinding. The two products may be used separately, or the two products may be mixed to obtain a product with a broad particle size distribution.

Another embodiment of equipment using the separator of the present invention is shown in FIG. In this embodiment, the separation airflow 14 for the lower stage of the separator is entirely made into the atmosphere, and the airflow fraction 15 containing the powder leaving the lower stage of the separator has its powder removed by the filter 41 and is discharged through the stand cylinder 48. To be done. By changing the rotation speeds of the upper and lower stages of the separator by the variable speed drive devices 10 and 18, and changing the flow rate of the upper and lower separation airflows by the flow rate control devices 46 and 47, 2
The particle size of the individual products 17, 45 can be adjusted. Even in this case, the two products 17 and 45 may be used separately, or the two products may be mixed to obtain a product having a wide particle size distribution. The removed coarser material 17 is returned to the grinder for further grinding.

[Brief description of drawings]

FIG. 1 is a diagrammatic sectional front view of a separator of the present invention.

FIG. 2 is a cross-sectional plan view of a modification of the separator of the present invention.

3 is a cross-sectional view of the separator of FIG. 1 taken along the line III-III.

FIG. 4 is a cross-sectional view of the separator of FIG. 1 taken along line IV-IV.

5 is a cross-sectional view of the separator of FIG. 1 taken along the line VV.

FIG. 6 is a diagram schematically showing a crushing facility incorporating the separator shown in FIG.

FIG. 7 is a diagrammatic view of an example of possible crushing equipment incorporating the inventive separator shown in FIG.

[Explanation of symbols]

 1 Vertical feed pipe, supply pipe 2 Top part 3,6 Separation rotary drum 4,7 Introduction duct 5,8 Delivery duct 9 Discharge hopper 10,18 Variable speed drive device 11,26 Material 12 First separation air flow stream 13 First air flow fraction 14 Second Separation Air Flow 15 Second Air Flow Fraction 16 Rim 17 Coarse Material 19 Shaft 19 'Second Shaft 25 Crusher 27 Elevator 28 Separator 29 Air 30 Atmosphere 31 Upper Stator 32 Filter 33, 48 Standpipe 34 First Product 35 Separation Air 36 Lower Stator 38 Second Product 40, 46, 47 Flow Control Device 41 Filter 42 Conical Plate 43 Base 44 Radial Arm 49 Juan

Claims (14)

[Claims] 1. A pair of rotating drums arranged separately in series one above the other, in a dynamic separator of powder material, especially cement, incorporating a rotating drum across which a stream of air acting as a separating medium is traversed. A spiral duct in which the inlet and the outlet are respectively tangential to each of the rotating drums so that the airflows separately supplied to each of the rotating drums in the dynamic separator cross each of the rotating drums. Is provided
Two fractions of distinct size of fine particles leaving the tangential duct by the air flow passing through each of the rotating drums;
A dynamic separator characterized in that it forms a coarse particle fraction descending in the dynamic flow distributor, and finally forms three fractions having different particle sizes as a whole. 2. A dynamic separator as claimed in claim 1, comprising a single shaft for rotating the two rotating drums. 3. A dynamic separator as claimed in claim 1, comprising two independent shafts for driving each of the rotating drums separately at respective rotational speeds. 4. A circular stator disposed outside each of the rotating drums toward the duct in a tangential direction so that the separating airflow encounters the circular stator, and the fixing is performed before the airflow hits the rotating drums. The dynamic separator according to claim 1, wherein the air flow is blocked and carried by a child. 5. The dynamic separator of claim 1, wherein the two drums have different geometric shapes such as height or diameter. 6. The dynamic separator according to claim 1, wherein the drum is provided with a plurality of selector blades fixed to a peripheral edge in a radial direction or an inclined direction. 7. The dynamic separator according to claim 6, wherein the two drums differ from each other in the number of selector blades. 8. The dynamic separator according to claim 1, wherein the flow rates of the air streams for separating the two drums are different from each other. 9. A dynamic separator according to claim 1, wherein each of the two fractions of fine particles leaving the separator from the duct in the tangential direction is sent to a corresponding dust removal step. Equipment to get. 10. The equipment according to claim 9, wherein an air flow containing the powder treated in the dust removing step is recirculated to the separator. 11. A crusher is provided which crushes particles separated from an air stream into a powder material, and the air stream from this crusher is mixed with the atmosphere and sent to the first drum of the separator as an air stream for separation. The equipment according to claim 9. 12. The installation according to claim 9, wherein the coarsest fraction produced in the separator is returned to the grinding step. 13. The equipment according to claim 9, wherein an air flow generated from the atmosphere, a crusher or a treatment system or a dust collection facility, or an air flow recirculated from the dust removal unit is used as a separation air flow in each step. 14. The installation according to claim 9, wherein the products obtained from each of the two separation steps are used separately or mixed to give a single product of a given particle size distribution.