Fluidized bed sorting method and device for fine-grained coal sound field

Abstract

The invention relates to a fluidized bed sorting method and device for a fine-grained coal sound field. The method and the device is suitable for dry coal selection operation in alpine area and arid water shortage area. The device is composed of an air inlet, an air outlet, a fluidized bed body, a material and medium feeding funnel, an acoustic wave generator, a gas distribution plate, a fine coalscraping plate, a material shifting wheel, a density automatic control assembly, a fine coal product and a gangue, wherein the acoustic wave generator is arranged at the top of a bed layer, the generated sound waves can reduce the acting force between fine particles, channeling and slugging can be effectively inhibited, the critical fluidization velocity is reduced, the fluidization quality of the particles is improved, a stable gas-solid two-phase separation fluidized bed is formed, the distribution plate is obliquely arranged at the bottom of the bed body and covered with two layers of filter cloth, the density automatic control assembly comprises a density ball, a V-shaped spring clamping rod and a valve, and can be used for effectively maintaining uniform and stable of density of thebed layer and improving the sorting precision of the fine-grained coal in the fluidized bed layer. The device is simple in structure, easy to operate and wide in practicability.

Description

technical field [0001] The invention relates to an acoustic field fluidized bed separation method and device for fine-grained coal, which is suitable for performing dry-method coal preparation operations on fine-grained coal in areas with high cold, drought and water shortage. Background technique [0002] Dry coal preparation technology has obvious technological advantages for the efficient separation of coal resources in my country's alpine, arid and water-deficient regions. The gas-solid separation fluidized bed dry coal preparation is a high-efficiency dry separation technology that applies gas-solid fluidization technology to the field of coal preparation technology. It uses compressed air to realize the fluidization of solids and heavy materials. A kind of "like fluid" is formed in the bed, which makes the bed have a certain density, and according to the difference in density between materials, the light and heavy products can be sorted according to a certain density i...

AI Technical Summary

Problems solved by technology

The uniformity and stability of the bed is very important in the separation process, but in the actual separation process, air bubbles are easy to form in the bed after the air is distributed through the distribution plate, and the bubbles coalesce and form large bubbles during the ascent process, causing Heavy mass back-mixing will affect the uniformity and stability of the bed, and the local unfluidized area (dead area) in the bed will further cause the density fluctuation of the bed, especially when the fine particles have agglomeration effect during the fluidization process, it will It will seriously hinder the normal fluidization of the bed

Using a sorting fluidized bed for dry separation of +6mm coal can achieve a relatively ideal separation accuracy, but the separation result for -6mm fine coal is poor, so a sound field gas-solid separation is developed The fluidized bed device can reduce the influence of fine particles on the fluidized bed, realize the self-regulation of the bed density of the fluidized bed, and then promote the uniformity and stability of the bed, which is an effective way to improve the separation of fine coal in the gas-solid separation fluidized bed. one of the ways

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