Pneumatic particle size classifying device for solid particles

Abstract

A pneumatic particle size classifying device for solid particles comprises a fluidized bed main body, a cyclone separator, material inlets, an air distributing system, a secondary air port, a coarse material outlet and a fine material collecting and discharging system. The material inlets are positioned on the middle upper portion of the fluidized bed main body and are distributed on four walls in a multi-point manner, the hopper-shaped air distributing system consists of an inclined air distributing plate, the coarse material outlet is arranged in the center of the inclined air distributing plate, the fine material collecting and discharging system consists of a fine material collecting chamber and an intermittent discharging valve and is directly connected with a lower particle outlet of the cyclone separator, or the fine material collecting and discharging system can consist of a fine material collecting chamber and a fine material discharge port and is connected with a particle outlet of a feedback valve. The pneumatic particle size classifying device is simple in structure, effective pneumatic particle size classification for selective coking coal particles is carried out by fluidization technology, retaining time of the particles in the bed body can be effectively prolonged, the pneumatic particle size classifying device is stable in running and fine in separation effect, and energy and coking coal resources are greatly saved.

Description

technical field [0001] The invention relates to a solid particle pneumatic particle classification device, which belongs to a particle classification device which applies the fluidized bed principle and fluidization technology to the classification of coking coal particles. Background technique [0002] The rapid development of my country's economy is closely related to the development of heavy industry, especially the development of iron and steel industry. As a result, the demand for coke, an important raw material, is increasing day by day. my country is rich in coal resources, but at the same time, there are few high-quality coal types in my country, and most of the raw coal is directly used, resulting in a lot of pollution and energy waste. Especially for the coking industry, coking coal reserves are relatively small, and high-quality coking coal resources are scarce. [0003] Coking coal has high requirements on the ash and sulfur content of the coal, so the coking co...

AI Technical Summary

Problems solved by technology

At present, many coal preparation plants in my country have problems such as low degree of automation, poor equipment reliability, and poor separation effect. The coal preparation processes used include disturbed bed separation, dense medium separation and water medium cyclone separation, etc.

However, the common feature of these processes is that the selected particles are mainly layered according to the density, the particles of different particle sizes are seriously mismatched, the sorting effect is poor, and the separation process of the sorted coking coal and the medium is difficult; at the same time, each process is It requires different levels of water resources, and it is not suitable for water shortage and cold and easy to freeze areas

[0004] However, due to the fluidization characteristics of the fluidized bed itself, particles of different densities and particle sizes can exhibit different fluidization characteristics in the fluidized bed. Therefore, it is possible to use a fluidized bed for coal dry separation

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