Particle classification device

Abstract

The invention provides a particle classification device. The particle classification device comprises a shell, a particle inlet pipe, a plurality of air outlet pipes, a dispersing sieve plate, structured packing, a collecting sieve plate, a second particle outlet pipe and an air distributor, wherein a first particle outlet pipe is arranged at the bottom end of the shell; the particle inlet pipe and the air outlet pipes are arranged on the top of the shell, the air outlet pipes are uniformly distributed in the circumferential direction and encircle the particle inlet pipe, and the dispersing sieve plate, the structured packing and the collecting sieve plate are arranged in the shell from top to bottom in sequence; the point of the dispersing sieve plate directly faces the lower end of the particle inlet pipe, an oblique channel is formed in the structured packing, the lower end of the second particle outlet pipe connected with the point of the collecting sieve plate is located outside the shell, the air distributor comprises a ring pipe which is arranged in the shell and located on the lower side of the collecting sieve plate and an air inlet pipe which is communicated with the ringpipe, an opening facing downwards is formed in the ring pipe, and the air inlet pipe penetrates through the side wall of the shell and is connected with an air source. The particle classification device can take high particle dispersion, regular air flow field distribution and multi-time elutriation of the air flow to fine powder into account.

Description

technical field [0001] The invention relates to the technical field of powder preparation and processing, in particular to a particle classification device. Background technique [0002] As a basic industrial operation, particle classification is widely used in mineral processing, filter material regeneration, powder selection and other industries due to its high separation efficiency, good economy, and strong environmental adaptability. Among them, air classification has higher efficiency for binary particle classification. [0003] When designing an air classifier, multiple technical links need to be considered comprehensively, mainly including: particle dispersion, distribution of air flow field, and multiple elutriation of fine powder by air flow. Good dispersion can reduce the possibility of particle agglomeration and entrainment. The stable and regular flow field can control the classification accuracy and classification particle size at any time. The process of fine ...

AI Technical Summary

Problems solved by technology

Although the fine powder can be analysed multiple times, the amount of entrainment is too large due to insufficient particle dispersibility

The perforated tray classifier proposed by Wang Haibo et al. adds horizontal perforated trays in the separation chamber, which obviously improves the classification quality but the pressure drop is too large

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