SU1304883A1 - Hydraulic classifier - Google Patents

Abstract

The invention relates to the field of hydraulic engineering, in particular the hydraulic separation of bulk materials into fractions, including the separation of ash and slag materials in the process of hydraulic ash removal. The purpose of the invention is to improve the quality of classification and increase the reliability of the classifier. In its case 1 with the bottom, along the material flow, there are plates packs (P) 2. Moreover, P 2 are installed vertical. 1no, and their ends facing the device 3 for introducing the initial suspension, are made with a bevel to the bottom 1. The bottom through the slots 6 communicates with the collector 7 for water supply and is stepped with a slope in the course of the material movement. When working in the P 2 cells, the initial suspension under the action of the force of gravity and the turbo, penta nous, partitions is divided into coarse (fine) and fine (ash) fractions. Large particles, the deposition rate of which 6 (), ibnie, pulsating flow rates, settle along P 2 below their level, which reduces the wear of P 2, and is transported to the device 5 for slag removal. At the same time, the particles are washed with clean water through the slots 6. The smaller ones are suspended and transferred to the device 4 for the output of the PULP. 2 Il. SL 00 about "00 00 00 Fig.1 A

Description

The invention relates to hydraulic engineering, in particular, to the hydraulic separation of bulk materials in the fraction, including the separation of ash and lacquer materials in the process of hydraulic removal.

The aim of the invention is to improve the quality of classification and increase the reliability of the classifier.

FIG. 1 shows a schematic of a hydraulic classifier, a longitudinal section; figure 2 - section aa in figure 1.

The classifier includes a bottom case 1, plate packs 2, devices for introducing the initial slurry 3, outputting the pulp 4 and withdrawing the slag 5. The housing through the slots 6 for washing the slag communicates with the collector 7 for supplying water. Plates are mounted vertically and do not .lo- t up to the bottom of the case by 0.1 heights. The bottom of the body is stepped with a slope in the course of the movement of the material. The ends of the plates facing the device for introducing the suspension, are made with a bevel to the bottom of the body under - 45 ° to the horizon. The shells in the bottom are trapezoidal in shape, tapering to the exit, for flushing the coarse fraction from the ash. The plates form a series of parallel channels with a width: height: length ratio of 1: 10: 200. Below the package of plates in the housing, a channel is formed into which at the same time from all the cells the sedimentation of particles exceeding the limiting particle size occurs.

Classifier works as follows.

The ash and slag pulp enters through the pipeline into the housing 1 through the switchgear and enters all the deposition cells. In the cells of the stack of plates 2, the coarse (slag) and the coarse (ash) fractions under the action of gravity and turbulent pulsations, depending on the size of the stream, are separated by size.

The work of the classifier is based on the restructuring of the turbulent suspended flow due to a change in the turbulent spectrum of pulsations. By introducing plates 2, the transverse size of the flow is changed, and by splitting turbulent vortices into parts, the low-frequency part of the spectrum of tubular pulsations is quenched, thus, the carrying capacity of the flow is reduced at the same average speeds. As a result

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Particles whose deposition rate is greater than the pulsating flow velocity are deposited in the lower part of the device, while the smaller ones are suspended and transferred to the fixture 4 for the pulp output.

The flow through the distribution device is in the space between the plate.mi, particles with a particle size below the boundary (ash)

0, due to weighing by small-scale vortices, remain in the visited state in the flow and are output together with the flow of clarified water through the upper outlet in the housing. Large-scale eddies are extinguished by a plate system. As a result, large particles (slag) are deposited along the plates below the level of the vertical plates (the number of contacts and, therefore, abrasive wear is reduced) and transported by the "heavy liquid" bottom stream.

0 (pulp, and meyush. Shee increased in comparison with the average throughout the section concentration and bulk density) to the device, 5 to remove slag.

At the same time, the particles are washed through the bottom slits with clean water and discharged through the device 5 into the distribution pipeline. The proposed device, by making the plate pack vertical along the stream, prevents the coarse fraction (plunk) from slipping over the plates, which reduces the abrasive wear of the plates and the possibility of slag space between the plates.

Claims (1)

Invention Formula A hydraulic classifier, including a housing with a bottom, plate packs installed in the housing along the material flow, devices for introducing the initial suspension and withdrawing the obtained fractions, characterized in that, in order to increase Quality of classification and increase of the classifier’s reliability, it is provided with a collector for water supply, the plates are installed vertically, and their ends facing the device for introducing the initial suspension are bevelled to the bottom 5 housing, with the bottom of the housing communicated with the collector through the slots and performed stepwise with the MC, youth as the material moves. five 0 FIG 2