RU22625U1 - PNEUMATIC CLASSIFIER - Google Patents

Abstract

Pneumatic classifier, including the casing in the form of a vertical shaft, a material supply pipe located in the upper part of the housing, an air supply pipe located in the lower part of the housing, finished product pipes located in the upper and lower parts of the housing, contact elements of two types located inside the housing: the upper one, consisting of connected perforated gable and four flat shelves fixed to the shaft walls, and the lower one, consisting of two gable and two flat shelves, characterized in that a mesh is installed in the lower part of the housing, which is inclined to the pipe of the finished product, and the mesh occupies the entire cross section of the housing.

Description

Pneumatic classifier.

The invention relates to the field of processes for the separation of bulk materials in size by an upward flow of air, and can find application for fractionation of bulk materials in the mining, chemical, grain processing, food, construction and other industries.

A known apparatus for classifying granular materials, including a housing made of a set of vertical separation columns with contact elements, in the form of flat shelves, a louvre grille installed at an angle to the loading nozzle in the lower part of the housing, loading and unloading nozzles, an air supply device (automatic certificate of the USSR No. 787113, CL B 07 B 4/08, 1979).

The disadvantage of this classifier is the relatively low quality of the separation of the mixture due to the negative influence of the wall effect.

The closest in technical essence and the achieved result to the proposed device is a gravity pneumatic classifier {ed. testimonial. No. 2123391, Cl. 6 V 07 V 4/00, 4/08, B.I. No. 35 1994), comprising a case in the form of a vertical box of rectangular cross-section, a material supply pipe located in the upper part of the body, an air supply pipe located in the lower part of the body, finished product pipes located in the upper and lower parts of the body located inside the body contact elements of two types: the upper one consisting of connected perforated gable and four fixed to the walls

2000102506

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 ft07B shaft flat shelves, and lower, consisting of two gable and two flat shelves. The disadvantage of this classifier is the relatively low quality and clarity of the separation of mixtures due to the incomplete use of the working volume of the classifier. The objective of the invention is to improve the quality of separation due to the enrichment of a large fraction. The problem is solved as follows: in a pneumatic classifier, which includes a housing, a pipe for supplying material in the upper part of the housing, a pipe for introducing air in the lower part of the housing, pipes of finished products in the upper and lower parts of the housing, contact elements located inside the housing, consisting of a set of flat and gable shelves, in the lower part of the casing there is a grid that is inclined to the pipe of the finished product, and the grid occupies the entire cross section of the casing. The invention is illustrated in the drawing, where in FIG. 1 schematically shows a general view of a pneumatic classifier; FIG. 2 is a sectional view of the housing. The pneumatic classifier contains a housing 1, inside of which there is a grid 2, covering the entire cross section of the housing, and contact elements 3, 4 of two types: the upper 3, consisting of connected perforated gable and four flat shelves fixed to the walls of the housing, and the lower 4, consisting of two gable and two flat shelves. loading 5 and unloading 6.7 nozzles, nozzle for air supply 8. ti / c gPneumatic classifier works as follows. The source material is continuously fed through the pipe 5 into the working area and moves down the contact elements 3,4, splitting into four streams on the contact element 3 and then dividing into five streams on the contact element 4. In this case, the material particles make a zigzag movement, which contributes to intensive mixing of the material with the air flow i.e. more uniform distribution over the cross section of the housing. After that, the material falls onto the grid, which serves as an additional unit for material cleaning and occupies the entire cross section of the housing. The material on the net rolls into the discharge pipe. Toward the material through the pipe 8, air moves, which, passing through the grid and the material on it, forms a loosened layer, which contributes to the removal of the fine fraction, and as a result, the enrichment of the large fraction. Further, air going around the contact elements 3.4 and passing through the perforation of the latter penetrates the moving layer of dry material in several directions, evenly distributing the material particles along the height of the casing. In addition, the air flowing around the contact element 3 is divided into four streams, which then decay into five flows when flowing around the contact element 4, thereby reducing the negative effect of the wall effect on the quality of material separation. The light fraction is removed through pipe b, and the heavy fraction is removed through pipe 7.

In contrast to the prototype, the use of a grid allows to increase the efficiency of material separation due to the enrichment of a large fraction.

2

Using the proposed pneumatic 0 classifier for the separation of bulk materials by an upward flow of gas provides compared with the prototype the following advantages:

1. Increasing the separation efficiency due to the use of the mesh, which causes a uniform distribution of material in the lower part of the housing.

2. Improving the quality of separation due to more complete use of the working volume of the classifier and an increase in the contact surface of the phases due to the use of the mesh in the lower part of the housing.

3. The ability to produce stuff in the classifier by increasing the residence time of the material in the working area due to the use of the mesh.

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Vice-rector, I№fef: i; Tretyak A.Ya

Claims (1)

Pneumatic classifier, including the casing in the form of a vertical shaft, a material supply pipe located in the upper part of the housing, an air supply pipe located in the lower part of the housing, finished product pipes located in the upper and lower parts of the housing, contact elements of two types located inside the housing: the upper one, consisting of connected perforated gable and four flat shelves fixed to the shaft walls, and the lower one, consisting of two gable and two flat shelves, characterized in that a mesh is installed in the lower part of the housing, which is inclined to the pipe of the finished product, and the mesh occupies the entire cross section of the housing.