SU1609520A1 - Centrifugal classifier - Google Patents

Abstract

This invention relates to the separation of bulk materials. The purpose of the invention is to increase the separation efficiency due to the preliminary separation of the material. The centrifugal classifier contains a cylindrical body / CC / 1 with a horizontally mounted lid 2 and a bottom 3. Along the periphery of CC 1, there is an annular nipple / P / 4 gas supply with twisting blades 5 and an annular P 6 coarse fraction. In the upper part of the Central Committee 1 is located axial P 7 removal of the fine fraction. On the cover 2 of the Central Committee 1 between P 4 and 6 is installed annular P 8 supply of the source material. Inside the Central Committee 1 and coaxially placed him ring wall / KP / 9 and external 10 and internal 11 ring shells. KP 9 is installed horizontally and is placed between P 4 and 7. Shell 10 and 11 with its lower edges are adjacent with an axial clearance, respectively, on the outer and inner side of the gearbox 9. The upper edge of the shell is placed in P 4 and the upper edge of the shell 11 is connected to the cover 2 between P 8 and 7. In the axial gap between the KP 9 and the lower edge of the shell 11, additional twisting blades 12 are placed. The source material flows through P 8 and the gas through P 4. The material is preliminarily separated in the zone bounded by the KP 9 and the shells 10. Final separation It is the CC 1. In the separation boundaries by thin gas further podkruchivaets blades 12. 1-ly z.p.f 2 yl.

Description

The invention relates to devices for separating bulk materials into fractions and can be used in the chemical, construction, mining, energy, and other industries.

The purpose of the invention is to increase the separation efficiency due to the preliminary separation of the material.

FIG. 1 schematically shows a centrifugal classifier, a longitudinal section; in fig. 2 shows a comparison of the experimental separation curves for the prototype and the proposed classifier.

The centrifugal classifier includes a cylindrical body 1 with a lid 2 and a bottom 3, an annular nipple 4 for gas supply with spinning blades 5, an annular nipple b for coarse fraction removal, an axial nipple 7 for discharging fines and gas and an annular nipple 8 for supplying the source material. Between the lid 2 and the bottoms 3 there is an annular partition 9 with annular shells 10: i 11 covering it with radial clearances. The upper edge of the annular shell 10 is placed in the gas supply nozzle 4, and the upper edge of the shell 11 is connected to the housing cover 2. Additional twisting blades 12 may be placed between the annular septum 9 and the shell 11.

Centrifugal classifier works as follows.

I az is sucked through the pipe 4, twisted by the blades 5 and falls into the zone formed by the housing 1 with the lid 2 and the bottom 3. In this case, the gas of the outer shell 10 is divided into two vortex flows separated by an annular partition 9. Upon reaching the upper vortex flow The gas of the internal shell 11 through the radial gap between the annular partition 9 and the shell 11 is again combined with the sludge flow, and they are sucked together through the nozzle 7.

The source material flows through the annular nozzle 8 into the upper vortex flow between the lid 2 and the partition 9, where the centrifugal countercurrent classification is rotated, resulting in a large fraction of the wasps on the inner surface of the shell 10 and sliding down, and the fine fraction together with the gas passes through the radial gap between the partition 9 and the shell 11 also down. As a result, the coarse and fine fraction of the original separation again falls into a vortex flow between the partition 9 and the bottom 3, where each of the fractions is subjected to repeated centrifugal countercurrent classification. Finally, the coarse fraction is withdrawn through the annular pipe 6, and the small fraction is sucked together with the gas through pipe 1. When separating along thin boundaries, when a large swirl of flow is required along the radius of the apparatus, the gas can be additionally twisted by paddles 12.

Claims (2)

Comparison of the separation curves of the prototype classifier and the proposed one, performed in bench conditions on models with a diameter of 400 mm (Fig. 2), shows the possibility of a significant increase in separation efficiency when installed in the zone of separation of partitions and shells. Thus, the separation efficiency indicator k - (325675, where is the size of the narrow fractions carried to the fine fraction by 25 and 75%, respectively, increases from 0.5 to 0.69, i.e. by 38%. Invention 1. Centrifugal classifier, including a cylindrical body with a horizontally mounted lid and bottom, located on the periphery of the body an annular gas inlet with spinning blades and an annular elbow for large fraction removal, an axial elbow for the fine fraction located in the upper part of the housing, and an annular elbow Water source material mounted on the housing cover between the gas inlet and the fine fraction removal nozzles, characterized in that, in order to increase the separation efficiency due to the preliminary separation of the material, it is provided with outer and inner ring shells and an annular partition located inside the housing coaxially The annular partition is installed horizontally and is placed between the gas inlet nozzle and the fine fraction output nozzle, the outer and inner shell with its lower edges They are connected with an axial gap, respectively, from the outer and inner sides to the annular partition, the upper edge of the outer shell is placed in the gas inlet pipe, and the upper edge of the inner shell is connected to the housing cover between the source material inlet pipe and the fine fraction outlet pipe. 2. Classifier according to claim 1, of tl and h and y and with the fact that it is supplied with an additional 516095206 with twisting spatula blades, a spacing partition and a lower edge shielded in the axial gap between the annular annular shell. 1,, 0 Om / ocame / Jbffe / (/ size ippoffi e / i / Fig. G - - without rrepesopodf tf () - o- With nepezopodffou (w “qSS)