Intelligent coal dust removing and washing system and method

Abstract

The invention discloses an intelligent coal dust removing and washing system and method, and belongs to the field of coal separation. According to the intelligent coal dust removing and washing system and method, raw coal is fed into a scraper A for screening, materials are distributed to a flip-flow screen B or a cross screen C for the screening according to different calorific values or moisture of the raw coal, the materials on the screen are separated through a dense medium separation unit after desliming, and lump clean coal, fine clean coal and gangue are obtained after the dewatering is conducted through a medium drainage screen, a classifying screen and a centrifugal machine, coal slime water generated in the separation process is subjected to the links of grading, concentration, dehydration and the like, and coarse coal slime, fine coal slime and circulating water are obtained. Mixing a undersize material of the flip-flow screen B or the cross screen C with the coarse slime and the fine clean coal to obtain a mixed coal product, and returning the circulating water to the system for recycling. The washing system can select different pulverized coal removing devices according to different calorific values and moisture of the raw coal, achieves pulverized coal removing and washing of coal, improves the calorific values of the coal, is practical and effective, and has good application prospects in the field of coal separation.

Description

technical field [0001] The invention belongs to the field of coal technology and coal equipment, and relates to an intelligent coal powder removal and washing system and method. Background technique [0002] Calorific value is the main index for classification and pricing of thermal coal, and thermal coal with low calorific value needs to be washed to improve its quality. At present, thermal coal washing is mainly based on powder removal and washing, which can not only reduce the coal slime entering the washing system, reduce the pressure of the slime water treatment link, but also avoid the "ash" caused by the decrease of ash content and the increase of water content after the final coal washing. "Grey water offset" results in a situation where the calorific value does not increase. In addition, the powder removal process needs to change the mesh size according to the coal quality of the raw coal. When the calorific value of the raw coal decreases, it is necessary to reduc...

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Problems solved by technology

[0005] In order to overcome the above-mentioned shortcomings of the prior art, the object of the present invention is to provide an intelligent coal dedusting and washing system and method, aiming at solving the problem of sticky sieve holes caused by the use of relaxation sieve depowder in the prior art, and the screening efficiency Significantly reduced; the distance between the sieves is fixed when using a cross sieve, the size of the sieve hole is not easy to adjust, and it is difficult to adapt to the defective technical problems of coal quality fluctuations

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