Efficient airflow classification fine-coal remover for power coal before selecting

Abstract

The invention belongs to the technical field of fine-coal removal and classification before washing and selecting of coal and particularly relates to an efficient airflow classification fine-coal remover for power coal before selecting. The fine-coal remover comprises the following components such as a material dispersion area, a primary classification area and a secondary classification area; in the material dispersion area, materials are collided under the impact of airflow and are dispersed mutually; in the primary classification area, the materials after dispersion are divided into primary fine particle materials and primary coarse particle materials through a 360-degree full-annular air-distribution and material-distribution mechanism; and in the secondary classification area, the primary fine particle materials are divided into secondary fine particle materials and secondary coarse particle materials through a wind power rotary driving classification mechanism, and the secondary fine particle materials and the secondary coarse particle materials are discharged out of the secondary classification area so as to finish the eventual classification. According to the invention, the material classification process includes two dispersions and two classifications, so as to solve the problem of screen blinding as well as improve classification efficiency at the same time, realize that classification granularity can be adjusted and controlled within 0-13 mm as required, meet the requirements of classification and section of whole particle dry process, and ensures that a circulating fluidized bed furnace of a mine -mouth power plant has coal to use for generating power.

Description

technical field [0001] The invention belongs to the technical field of powder removal and classification before coal washing, and in particular relates to a high-efficiency airflow classification and powder removal machine before power coal selection. Background technique [0002] my country is rich in steam coal resources, but because my country's steam coal is mainly distributed in the north and west, this geographical distribution determines the coal transportation and sales structure of "north coal transportation" and "west coal transportation" in China, while my country's coal However, there is a shortage of transportation capacity in transportation. With the construction and development of large-scale pithead power stations in my country, it has become an inevitable trend to switch from coal transportation to electricity transmission. [0003] With the improvement of coal mining mechanization, the content of pulverized coal in raw coal has greatly increased, and the con...

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Problems solved by technology

[0004] If the wet method is used to select these fine coals, not only the slime recovery system is complicated, the recovery rate is low, but also the investment is large, the production cost is high, and the resources are wasted and the environment is damaged.

[0005] For dry coal preparation, although certain results have been achieved, such as the application of air-heavy medium fluidized bed and FX-type, FGX-type dry separators, etc., it is also in line with the coal washing environment in the western and northern regions with drought and less water, but the dry method The effective lower limit particle size of coal preparation and separation is 6mm, and the grading sieve used in actual production still often has the problem of sieve clogging in the sieving and grading of 6mm and below particle size, and the coal type has poor adaptability, which cannot guarantee the classification efficiency

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