Technique for preparing furnace coal combined coking with coals

Abstract

This invention discloses a method for manufacturing furnace coal from coking mixed coal. The method directs the mixed coal into a pneumatic separation drier of semi-boiling fluidized bed for grading of grain fineness and drying. The mixed coal is divided into two grades of furnace coal: one with grain fineness of lower than 3 mm and the other with grain fineness of higher than 3 mm, and the content of water in the mixed water is reduced to 6.5-7.5%. The furnace coal with grain fineness of lower than 3 mm is directed to the overhead of the column for coking; the furnace coal with grain fineness of higher than 3 mm is directed into a pulveriser chamber for pulverization, and the pulverized coal is directed into the pneumatic separation drier again for grading of grain fineness and drying, or directed into the overhead of the column for coking. This invention has such advantages of even distribution of furnace coal grain fineness, reducing water content in furnace coal and improving coking capacity.

Description

technical field [0001] The invention mainly relates to the technical field of coking coal pretreatment in a coking plant, in particular to a process for preparing furnace coal from coking blend coal using a semi-fluidized fluidized bed pneumatic separation dryer as the preparation equipment. Background technique [0002] In coking production, the production process of the existing coal preparation workshop is as follows: After transporting about 60% of the coking coal with a moisture content of about 10% and a coal particle size of less than 3mm into the coking plant, it is unloaded by the unloading device and passed through a belt conveyor. The conveyor transports to the coal yard and stores them separately according to the coal types to homogenize the coal quality. The coking coal stored in the coal yard is sent to the coal blending section through the reclaiming equipment and the belt conveyor to prepare blended coal according to the coal blending ratio determined by the ...

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Problems solved by technology

[0010] 2. Because the particle size of the raw coal entering the factory is less than 3mm, about 60% of the coal is mixed, and all kinds of coking coals are crushed, so there is a large processing capacity of the pulverizer, a large power consumption of the motor, and high-quality coking coal. If it is too finely crushed, gas coal, lean coal, etc. will not meet the fineness requirements

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