SU854461A1 - Pneumatic classifier - Google Patents

Description

(54) PNEUMATIC CLUSIFICATOR

I

The invention is fire based for minerals, namely, devices for separating and classifying solid materials, and can be used to separate ground clinker in cement production.

A pneumatic classifier is known, which includes a separation chamber made in a vnde vertical zigzag channel, a loading nozzle and a nozzle mixture with a racing gland, and the separation chamber is made with an annular bottom cross-section formed by conical outer and inner sections, jj and inside the junction and inner section formed by conical outer and inner sections, jj and inside the inner section, formed by conical outer and inner sections, jj and inside the inner section, formed by conical outer and inner sections, and jj and inside the inner section, formed by conical outer and inner sections, and jj and inside the inner section, formed by conical outer and inner sections, and jj and inside device 1.

However, material separation occurs in a zigzag channel, although cascade separators with transfer devices in the form of inclined shelves are more effective. The supply of material is unsuccessful, since the supply nozzle crosses the separation zone, closes a part of the flow section of the classifier. In addition, the structure includes a 1-minute non-working cavity, which occupies most of the apparatus volume, which is the size of the classifier.

The closest in design features and results achieved to the proposed invention is a pneumatic classifier, a vertical cylindrical body with a feeder fixed in its upper part, pouring devices in the form of rotated truncated cones fixed on the wall of the body, and separating truncated cues attached to an axial element coaxially mounted to the casing; devices for supplying air; conclusions of the fines fraction and a receiver for the coarse fraction 2}.

The disadvantages of the famous classifier. They consist in the fact that the classified solid material is fed to the upper cone (distribution device) in the area of the fine product, which pollutes the fines in large particles. The outlet of the small stuff passes through the working section, which impairs the aerodynamics of the separation channel. The inner cones do not have a rigid clamp, move under the influence of upward air flow, which leads to pressure pulsations in the apparatus, i.e. non-stationary mode. Air is introduced into the device over the entire lower section, which results in the release of separation products in the lower part of the apparatus, i.e. to dusting. The purpose of the invention is to improve the quality of separation by changing the flow control of the material being divided and reducing the energy consumption for transporting the fines. The goal is achieved by the fact that in a pneumatic classifier that includes a vertical cylindrical case with a feeder in its upper part, pouring devices in the form of inverted truncated cones fixed on the wall of the case and dividing truncated cones mounted on an axial element installed coaxially with the device case for the supply of air, the fine fraction and the receiver for coarse., the axial element is made in the form of a pipe, the upper end of which is provided with a conical socket, and the lower end - with a nozzle data outside the enclosure. The drawing shows a pneumatic classifier. The pneumatic classifier includes a vertical cylindrical support 1 with a jacket 2 and a feeder 3 installed in its upper part, transfer devices in the form of inverted truncated cones 4 fixed on the walls of the housing, and separating truncated cones 5 mounted on an axial element 6 mounted coaxially with housing 1. The classifier has a device for supplying air (not shown in the drawing), the output of the fines fraction is carried out through the axial element 6, for the coarse fraction serves the receiver 7. The axial element 6 for Displayed fines vshol nen a tube whose upper end is provided with a conical funnel 8, and the lower - pipe 9 vdaedennym outside the housing. In the upper part of the housing 1 there is a loading bunker Yu, soy; zenny with a feeder 3, a distributed cone 11-, an adjusting device 12 with t gami. The upper part of the housing is terminated by a conical chute 12, which is connected to the lower part of the housing 1. The feeder 3 is sealed and mounted on a truncated cone 14. In the lower part of the housing there is a louvered grille 15.. Pneumatic classifier works as follows. The source material from the hopper 10 is supplied with a hermetic feeder 3 to the body 1 of the classifier and goes to the distributor xjus 11, where it is evenly distributed over the area of the entire cross section of the ring chute formed between the upper part of the hull and the jacket 2, and through it goes to the conical chute 13 which ensures uniform input of the source material into the apparatus. Coming off of this conical estrus, which is also a separation cone, the material is blown by an upward air flow and divided into two classes, one of which rises and the other descends. The lower class, enriched with large particles, descending towards the air flow, passes the next stage of separation in the lower section, and so on. Coming off the last separating cone 4, the coarse product undergoes additional purification from the fines, carried out when air enters the separat through the louvered grill 15, the air crosses the material falling from the lower conical flange and carries away the slipped small particles. The large product accumulates in the hopper 7. The upper class, enriched with fines, is lifted from the middle separation cone 4 to the outwardly separated separation sections, where it is further separated, enriched with fine particles. The fine fraction is sucked down from the apparatus through axial element 6, which is a device for transferring fines, to a known dust collecting apparatus. The proposed design of the classifier provides an increase in the efficiency of classification due to the stabilization of aerodynamic conditions in the entire working volume of the apparatus. The simplicity of adjusting the boundary size and frequency of separation products by changing the air flow rate and the relative position of the pouring chips, reducing energy consumption due to the fines in the lower part of the apparatus, mainly due to the force of gravity.

Claims (2)

1. USSR Author's Certificate No. 435О09, cl. B O7 B 4 / O2, 1972. 2. US patent number 3448858, cl. 209-138, 1E69 (prototype).