SU1651997A1 - Pneumatic classifier - Google Patents

Abstract

This invention relates to the pneumatic classification of various bulk materials in an upstream air flow. The goal is to improve the quality of separation and the productivity of the device by providing selective extraction rates for particles of various sizes. The classifier contains a hollow body 1 and an inclined perforated bottom (PD) 2 with openings 3 placed under the loading pipe 6 with openings 3 for the passage of a gas stream. Inside the housing 1 above the CPU 2, the separation elements (SZ) 4 are fixed, installed one above the other and forming separation shafts (US) 5. Under each US 5, part of PD 2 is designed as a projection 9 in the form of an irregular triangular pyramid with a base 10 and the apex 11, directed in the direction of the slope of the PD 2, and at least one face 12 of the protrusion 9 is perforated. The source material through the pipe 6 is fed into the housing 1 on the PD 2 under the first school 5, where part of the material enters upward into its internal cavity and is divided into large and small products. The small product is carried by gas into the outlet 8 of the gas flow. The coarse fraction descends along PD 2 to the next SS 5. When the material moves along PD 2, large particles fall onto face 12 of the protrusion and, being blown by an upward air flow, are poured onto the surface of PD 2, which has a greater slope. Due to the greater slope, the particles acquire a greater speed of movement according to AP 2. 3 Il. i o sp

Description

The invention relates to the pneumatic classification of various bulk materials in an upstream air flow and can be used in the metallurgical, construction, chemical and other industries associated with the use of bulk materials and requiring particle separation in the range of 0.05-1 mm. for two or more products.

The purpose of the invention is to improve the quality of the separation and the performance of the device by providing selective output rates of particles of various sizes.

FIG. 1 shows a pneumatic classifier, a general view, in FIG. 2 - inclined perforated bottom, distribution grid, top view; in fig. 3 is a three-dimensional image of a pneumatic classifier.

with so

hz

The pneumatic classifier includes a hollow body 1, having an inclined perforated bottom 2 with openings 3 for the passage of a gas stream, reinforced separation elements 4 inside the body, mounted one above the other, forming separation chambers 5, loading nozzle 6 for feeding the source material, located Above the upper edge of the inclined perforated bottom 2, the nozzle of the outlet 7 of a large product, fixed in the lower part of the housing 1 the nozzle 8 of the outlet of the gas stream with a small product. Under each separation shaft 5, a part of the inclined perforated bottom 2 is made with a protrusion 9 in the form of an irregular triangular pyramid with a base 10 and apex 11 directed towards the slope of the perforated bottom 2, and at least one face 12 of the protrusion JHoro 9 made perforated ...

Pneumatic classifier works as follows.

The source material is fed through the loading nozzle 6 into the hollow body 1 on an inclined perforated bottom 2 under the first separation shaft 5, where the separation process begins. Under the first separation shaft 5, a part of the material enters upward, into its internal cavity, where not large and small products are separated. The fine product is carried by gas into the outlet 8 of the gas flow with the fine product, the coarse fraction is lowered along the inclined perforated bottom 2 to the next separation shaft 5. When moving along the inclined perforated bottom 2 large particles fall on the perforated triangular face 12 of the pyramidal protrusion 9. there, they are blown by an upward air flow and, since the top of the face 12 is directed toward the inclination of the perforated bottom, 2, large particles are poured onto the surface of the inclined perforat oval bottom 2, which has a large slope. Due to this, large particles acquire a greater speed of movement along the inclined perforated bottom 2. Since the speed of movement of large particles along the inclined perforated bottom 2 is increased, their initial velocity also increases.

Q 0

five

0

five

on the perforated face of the next pyramidal protrusion 9 will be larger, and therefore, despite the fact that the angle of inclination of the perforated face of the pyramidal protrusion 9 is smaller than the angle of inclination of the perforated bottom 2, large particles will pass along the surface of the face of the protrusion 9 in less time and more quickly fall on the inclined perforated bottom 2. Moving in this way, larger particles will acquire a higher speed from element to element. Small particles are located in the upper part of the fluidized bed and the probability of their falling from the perforated face of the pyramidal protrusion 9 onto the inclined perforated bottom 2 is lower, and the probability of being carried to the separation shaft 5 is higher. Higher and the speed of their removal from the apparatus.

Thus, the time of passage of the perforated bottom by 2 large and small particles is reduced, which allows to increase the expenditure concentration and thus increase the productivity. At the same time, the quality of separation will not deteriorate, since the local concentration on the inclined perforated bottom 2 will not increase. The speed of movement of the frontier classes of particles will correspond to the intermediate value between the speed of movement at the angle of inclination of the face of the pyramidal protrusion 9 and the angle of inclination of the perforated bottom 2, which will ensure high-quality separation of the material at elevated expenditure concentrations (productivity). After the last separation shaft 5, large particles enter the outlet pipe 7 of a large product.

Claims (1)

Invention Formula Pneumatic classifier, including a hollow body, a loading nozzle placed in the lower part of a hollow body, an inclined perforated bottom placed under the loading nozzle, a nozzle of a large product located on the side of an inclined perforated bottom opposite to the loading nozzle, separation elements mounted above the inclined perforated bottom and one above another with the formation of vertical separation-, 51651997 at least one bottom of the bottom is made in the form of a protrusion into the thinning of the gas flow with a fine irregular triangular pyramid product installed in the upper part of the hollow body, characterized in that, in order to improve the quality of separation and productivity the works, under each separation shaft, the part is perforated, the Ministry of Foreign Affairs with the apex directed towards the slope of the perforated bottom, and at least the upper edge of the irregular triangular pyramid is made perforated. bottom is made in the form of a protrusion in the form of an irregular triangular pyra- , the Ministry of Foreign Affairs with the top, directed towards the slope of the perforated bottom, and at least the upper edge of the irregular triangular pyramid is made perforated. 41 one Fig.} FIG. 2 Fig.Z.