SU1342535A1 - Classifier - Google Patents

Abstract

FIELD OF THE INVENTION The invention relates to chemical engineering, namely, devices for pneumatic classification of particulate materials. The purpose of the invention is to increase the efficiency of classification due to the additional clean-up of the poured material. In the bottom-up expanding pneumatic shaft (PS) 1, in the mine order, on the opposite inner walls, the perforated forged inclined toward the center of GOL 1 (I’ve loosened the / f particle f (l f

Description

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overflow shelves (PP) 2. The under-shelf spaces of each PP 2 are separated by 3 partitions from 1S-channel 1. Partitions 3. installed with a gap 4., with the lower end of PP 2 and with a gap 5 with the inner walls of the PN 1, and PP 2 are made stepped in the direction transverse to the vertical axis of PN 1. Air injection system 6 is provided for supplying secondary air under PP 2, and system 7 is used for sucking air from the sub-cavity. The latter is made in the form of pneumatic canals 8 with longitudinal lamellar dividers 9 of flow with pouring elements 10.

The invention relates to chemical engineering, more specifically to devices for the pneumatic classification of particulate materials.

The purpose of the invention is to increase the efficiency of classification due to the additional cleaning of the bulk material.

Figure 1 shows the classifier, a general view; figure 2 - section aa in figure 1; on fig.Z - view B in figure 1; 4 shows a pouring shelf, a general view; figure 5 - option installation partitions.

The classifier includes a bottom-up expanding pneumatic shaft 1 with perforated pouring shelves 2 installed in staggered order on the opposite walls of the pneumatic shaft 1. Inside the pneumatic shaft, partitions 3 are installed, separating the subfloor space of each pouring shelf 2 from the pneumatic shaft. Partitions 3 are installed with a gap of 4 with the lower end of the pouring shelf and with a gap of 5 with the inner walls of the pneumatic shaft. Shelves 2 and partitions 3 are stepped in a direction transverse to the vertical axis of the pneumatic shaft 1.

For supplying secondary air under the pouring shelves 2, the sieterial is supplied through the inlet 12 to the lower part of the PN 1 to the shelf 17. partitions 3, stratifying into thin streams. When skirting the PP 2, a part of the material falls out on the upper face of PP 2, is poured over PP 2 and cleaned in the pneumatic channels 8. The fine fraction is blown off by secondary air and discharged through the nozzle 15, installed in the upper part of PN 1. -ly 5 il.

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Air injection theme 6, and for suction of air from the under-shelf space, system 7, made in the form of pneumatic channels 8 with longitudinal plate dividers 9 flow, equipped with pouring elements 10 with triangular inserts 11. Flow dividers 9 are installed with the possibility of adjusting the gap 4 with partitions. In the lower part of the pneumatic platform 1, the supply pipes for the starting material 12, the air supply 13 and the coarse fractions 14 are installed, respectively. 17

Classifier works as follows.

The material is fed through pipe 12 to the shelf 17. Coarse fractions are unloaded through pipe 14. The rest of the material is drained by an upward air flow through pipe 13 to the top of the pneumatic shaft 1. In it, the particles alternately round the pour-off flanges 2, wherein, the septum 3 is streamlined, the upward flow of particles splits into thin streams, which contributes to the effective separation of particles from the flow.

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When the flow turns when rounding off the shelves 2k, by reducing the gas velocity along the height of the pneumatic shaft, a portion of the material falls out on the upper face of the shelves 2, which is poured over the shelves. Through the pipe of the system 6, under the shelves 2, secondary air is supplied with a predetermined flow rate, which ensures the flow of the fraction that is smaller than the selected one.

The air passes through the perforation of the shelves 2 and carries away small particles to the next pouring shelf. The remaining mass of the material is reloaded with a given flow rate, which is regulated by changing the size of the gap 4 on the partition 3, where it is further cleaned in the pneumatic channels 8 with the pouring elements 10 due to the suction of air. The remaining part of the large material returns to the stream. When leaving the classifier, an upward flow of air with a fine fraction meets shelf 16, which contributes to the release of large particles.

The air-flow is discharged from the classifier through pipe 15 for dust cleaning.

Claims (5)

1. A classifier that includes an upwardly expanding bottom-up 35 pneumatic shaft with a nozzle for supplying source material to the lower part of the pneumo-shaft, branch pipes for withdrawing thin and coarse fractions, respectively, from the upper and lower parts of the pneumo-shaft; on the opposite inner walls of the pneumatic shaft, characterized in that, in order to increase the classification efficiency due to the additional clean-up of the poured material, it is equipped partitions separating the underfloor spaces of each pouring shelf from the pneumatic shaft channel and installed with the formation of gaps with the lower ends of the corresponding pouring shelves and the inner walls of the pneumatic shaft, secondary air injection systems for the pouring shelves and suction of air from the shelves. i 2. Classifier according to claim 1, which is based on the fact that the air suction system from sub-shelf spaces is made in the form of pneumatic channels with longitudinal lamellar flow dividers with pouring elements, while the flow dividers are turned by their bottom ends to the partitions and installed with the formation of a gap with them. 3. Classifier according to claim 2, characterized in that the flow dividers are installed with the possibility of adjusting the gap from the partition. mi 4. Classifier according to claim 1, about t of sl-chu. This is due to the fact that the pouring shelves and partitions are made stepwise in the direction transverse to the vertical axis of the pneumatic shaft. 5i8b Phage. 2 to.J Fi .M eleven  Rig. five Editor N.Rogulich Compiled by Yu.Pravotorov Tehred I. Popovich Corrector L. Pilipenko Order 4542 / 5. Circulation 538 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, F-35, Raushsk nab. 4/5 Production and printing company, Uzhgorod, Projecto st., 4