SU1599136A1 - Air gravity classifier - Google Patents

Abstract

The invention relates to the classification of dispersed materials according to the size of particles in the upstream air flow and can be used in the mining, coal, metallurgical, chemical industry, industrial building materials and other sectors of the national economy. The purpose of the invention is to improve the quality of classification by improving the aerodynamic characteristics of multi-stage pneumo-separating channels (PSC). In the lower part of the body 1 of the classifier, there is a separating chamber (RC) 2. Above the RC 2 is a multi-stage battery of the UCS 4, formed by undulating partitions (VP). A distribution-grate 5 is installed below the PK-2. At the opposite ends of the housing 1, above the grate 5 there are nozzles for loading 6 of the starting material and unloading 7 of the large product. In the lower and upper parts of the housing 1, the nozzles are installed, respectively, for supplying air 8 and exhausting 9 a mixture of air with a fine product. The height of the classifier VP is made with thickenings 10 in places of bending. The larger radius R of the bulge is (1-1.5) D _g , and the smaller radius R of the bulge is (1-1.5) D _g -A _k , where D _g is the hydraulic diameter of the PSK 4

A _to - the distance between the VP. The UCS 4 is made in the form of pipes of rectangular cross section. The distance B _to between flat walls 11 UCS 4 is equal to B _to = (1.7-2) A _to , where A _to is the distance between the VP. In this case, in RK 2 there is a separation of particles of the material. The coarse fraction falls out on the grating 5, and the smaller particles are carried away in PSC 4, where they are exposed to variables in magnitude and direction of inertial and aerodynamic forces. This allows coarse particles to be separated from the dispersed mixture stream. 1 hp f-ly, 3 ill.

Description

a tick of multi-stage pneumo-separating channels (PSK); In the lower part of the body 1 of the classifier, there is a separation chamber (RC) 2. Above the RC 2 there is a battery of multi-stage PSK

4, formed by waves with shaped partitions: (VP). Under PK 2, a distribution-grating distribution grid is installed.

5. With opposite ends of the case

1 above the grill 5 there are nozzles for loading 6 of the starting material and unloading 7 of a large product. In the lower and upper parts of the housing 1 there are nozzles for supplying air 8 and discharging 9 a mixture of air with a fine product respectively. The height of the classifier VP is made with thickenings 10 in places of bending. More

R. Zdius R of the bulge is equal to R (l-l, 5) Dr, and the smaller radius g of the bulge is equal to g (-1, 5), where D is the hydraulic diameter of the PSK 4; the distance between the EP, made by the UCS 4 in the form of tubes of rectangular cross section. The distance b between the walls 11 of the UCS 4 is equal to b) (1, 7-2) a, where

  The distance between the VP, In this case, in RK 2 there is a separation of particles of material. The coarse fraction falls on the grid 5, and the smaller particles are carried away in the UCS 4, where they are exposed to variables of magnitude-i. direction of inertial and azo-dynamic forces. This allows the separation of large particles from the stream of the dispersed mixture, 1 3, n, f-ly, Zyl,

The invention relates to devices for classifying dispersed materials according to particle size in the upstream air flow and can be used in the mining, coal, metallurgical, chemical industry, in the construction materials and other sectors of the national economy.

The purpose of the invention is to increase the quality of classification by improving the aerodynamic characteristics of multi-stage pneumo-separating channels.

Fig, 1 is a schematic representation of the proposed classifier; in FIG. 2, section A-A in FIG. 1; FIG. 3 is a section BB in FIG. 1,

Pneumogravitational classification-. The torus includes a housing 1 containing a separation chamber 2, a multi-stage pneumo-separating battery formed by partitions 3 channels 4, placed above the separation chamber, a distribution-roll grid 5 installed under the separation chamber 2, a branch pipe 6 for loading the source material, a branch pipe 7 dp unloading a large product pipe 8 for the supply of air and pipe 9. for removal of the air mixture with a small product. Partitions 3 are made wavy in height of the classifier with thickenings 1.0 in places of bend,

five

0

35

40

Big radius of thickening

R (-l, 5) Dr, and a smaller radius of thickening

g (1-1,5) 1) g-a,

where Dp is the hydraulic diameter of the channels;

the distance between the wave-like partitions, - Multi-stage front e-channels are made in the form of tubes of rectangular cross-section. The distance between the flat walls of 11 channels,

B, (1.7-2) -a,

- distance between undulating partitions.

where a

0

five

The classifier works in the following way.

Through pipe 5 into the separator chamber 2 of the classifier, the source material enters, In the same chamber through pipe 7 and the holes of the distribution-rolling grid. 5, air is supplied. In chamber 2, material particles are separated into large and small particles. At the same time, particles, whose soaring speed is higher than the speed of the air flow, fall onto the distribution-roll grid 5, particles with a soaring speed lower than the air velocity are picked up by the air flow and carried away to multi-stage pressure separating channels 4,

515

On the distribution-rolling grid 5, an aero-borne layer of material is formed, consisting of large particles with admixture of small particles. Purging this layer with Air makes it possible to clear material from fine particles on the grate. The resulting large product rolls down an inclined grating 5 to nozzle 6 and is discharged through it from the classifier. Small particles of an admixture of large, trapped in multi-stage pneumatic separating canapes 4 are subjected to the action of variables in terms of magnitude and direction of inertia and aerodynamic forces, which makes it possible to isolate large particles from the dispersed mixture flow. The latter along the walls of the channels 4 fall first into the separation chamber, and then to the rolling grid 5 Air mixed with small particles goes through the nozzle 8 to the small product separator. Making the partitions undulating and thickening at the points of bending makes it possible to reduce the aerodynamic resistance of the channel and to weaken the separation of the dispersed flow from the channel walls.

The use of the proposed classifier will reduce the energy consumption of the process of dividing dispersed materials into large and fine products and improve the quality of the products obtained by improving the aerodynamic characteristics of multi-stage pneumatic separation channels.

Claims (2)

Equation Formula I. Pneumogravitational classifier, including body, separator36 6 a numbered chamber located in the lower part of the housing; a multi-stage battery of pneumatic separating channels formed by partitions and placed above the separation chamber; a distribution and rolling grid installed under the separation chamber; nozzles for loading the source material and unloading a large product located at opposite ends of the housing above the distribution and rolling grid , -pipes for the supply of air and exhaust air mixture with a fine product, installed respectively at the bottom and at the top parts of the body, which, in order to improve the quality of the classification by improving the aerodynamic multi-stage pneumo-separating channels, the partitions are made in the form of a classifier in height and with thickenings in the places of bend, with a larger radius of thickening R (1-1,5) D D) Q. t5 - 5 0 s 0 and a smaller radius of thickening r (l-l, 5) Dr - a, where Dp is the hydraulic diameter of the channels; th | - distance between undulating partitions. 2. A classifier according to claim 1, characterized in that the multi-stage pneumo-separating channels are made in the form of tubes of rectangular cross section, wherein the distance between the flat walls of the channels B (1.7-2) a, where a.c is the distance between the undulating partitions. t. (Reg. 2 B-5 eleven 6 Fig.Z