SU1447429A1 - Pneumatic classifier - Google Patents

Abstract

The invention relates to devices for the air classification of sensible materials and can be. Used in coal, chemical, and other industries. The purpose of the invention is to increase the efficiency of classification due to the mechanical separation of the coarse fraction from the small fraction in the expansion of the mosh (PS). The pneumatic classifier consists of adjacent primary HSC. 1 n of the secondary PN 2. The two opposite walls of the NIC I and 2 are in the shape of a zigzag, the other two are flat, with the cross-section of Ø1 1 and 2 being alternately narrowed along the height of the apparatus. In the extensions PI 1 and 2, double-slot perforated inserts (B) 13,14 are installed, oriented with the apex of the slopes towards the boot device. At the same time, B13 is installed with a gap formed by the computer at the top of the ramp and secured by means of hinges 15. The ramps B 14 are connected by hinges 16. In the lower part there is a spout (n) 3 of the source material supply, and 4 outlets of a large pro (/) 4: -H "lik 1C

Description

duct and fitting 5 for air intake under the perforated grill 6 In the lower part, PM 2 is equipped with a grill 7, P 8 of the fine product outlet and P 9 air intake. From P 3, the material enters the grid 6, where it is blown

The coarse fractions are removed through P 4, the others are successively passing through several stages of purification, moving from one B 13 to another. Then the material enters the CC where it is cleaned. 2 hp f-ly, 3 ill.

The invention relates to devices for air classification of bulk materials and can be used in coal, chemical and other industrial areas.

The purpose of the invention is to increase the efficiency of classification due to the mechanical separation of the large fraction from the small fraction in the expansion of the pneumatic shaft.

FIG. 1 shows the pneumoclassifier, general view; in fig. 2 is a view A of FIG. 1; in fig. 3 is a section BB in figure 1 ..

The pneumatic classifier consists of two adjacent pneumatic drums: primary

1 and secondary 2. In the lower part of the primary pneumatic shaft there are nozzles for supplying raw material 3 and large product 4, as well as a choke 5 for drawing air supplied under the perforated grill 6. The lower part of the pneumatic bolt 2 is equipped with a similar grill 7, which overlaps only part of the section mines, as well as connections for the exit of the small product 8 and for the air intake 9. At the top of the pneumatic shaft

2 there are guiding housings 10 and a fitting 11 for discharging dusty air, equipped with a blind 12,

The body of the apparatus has a rectangular cross section. Moreover, the two opposite walls of each of the pneumatic shafts have the shape of a zigzag, and the other two walls are flat. The zigzag walls are set relative to each other in such a way that the cross section of each pneumatic shaft alternately narrows and expands along the vehicle's trot. In expansions of pneumatic shafts 1 and 2, dual-slotted perforated inserts 13 and 14 are installed, oriented by the top of the slopes in

0

five

0

five

0

five

0

side of the boot device. The inserts 13 are installed with the formation of a gap between them at the top of the ramp and are fixed with the help of hinges 15. The slopes of the inserts 14 are interconnected by hinges 16 mounted on the vertical axis of the pneumo-shaft 2. The angles oi and | b between the slopes of the risers 13 and 14 are adjustable.

When choosing the angles oi and between the slopes, the requirements for the dispersion composition of the classification products are guided, since by changing the angles d and 6, the residence time of the solid material in the working area of the classifier can be adjusted, and hence the composition of the resulting products. In order to intensify the process of interaction of the air flow with the aerous material, the slopes of the inserts 13 and 14 are perforated and their living cross section depends on the composition of the starting product and can vary from 10 to 30%.

Air classifier works as follows.

The source material is fed into the pipe 3 and falls on an inclined perforated shelf. Moving along it, the material is intensively blown by a stream of air through the perforations and carried upwards. The coarse fractions (coarse product) are removed through the nozzle 4. The remaining material is carried away in a stream and passes successively in several stages of purification, moving from one insert to another.

Particles that fall into the space between the slopes of the inserts fall into the gap gap and re-participate in the separation process. By varying the gap size, the residence time of the particles can be controlled.

in the working area and the separation efficiency in the pneumocircuit I,

Having passed the last stage of purification, the two-phase flow enters the connecting leg in the pneumo-watch 2. The latter operates in the counter-current mode. Having reached the upper insert 16, the material stratifies into two streams, which, falling from the slopes, fall on inclined sections of the zigzag walls. Moving along them to the axis of the chamber, both streams are mixed and fall on the insert, etc.

Placing perforated inserts in expansions of pneumatic shafts provides the following advantages of the proposed design in comparison with the known ones. The inserts in this classifier fulfill the functions of a reflective and screening device. On the one hand, they limit the height of the bursts of the solid phase resulting from the gushing movement of the latter. On the other hand, when the solid material is spouted, fractions are separated in height so that the fine sections are predominant in the upper sections of the fountain. Reaching the insert, the latter pass air through the slopes and saturate the material flows moving along it. from the upper stages of separation. Such saturation with fine-dispersed air flow fractions contributes to the effectiveness of the separation process.

Claims (3)

1. A pneumatic classifier, including a pneumatic shaft with a constricting-expanding cross section in height, installed in the extensions of the insertion pneumatic shaft, a loading and unloading device, so that to increase the classification efficiency due to the mechanical separation of the coarse fraction from the small fraction in the expansion of the pneumatic nib, the inserts are made in the form of double-faced perforated plates oriented with the apex of the slopes towards the loading device, 2. Air classifier according to claim 1, characterized in that the ramps of each insert are hingedly connected to each other on the vertical axis of the pneumo-shaft. 3. Air classifier according to claim 1, characterized in that the slopes of each insert are arranged so as to form a gap in the middle of the insert and rotate around the edges opposite this peak. BudArroSefl S- / by Fug.t FIG. g