Dry quenching coke powder coke back blending coking coal method

Abstract

The invention discloses a method for coking coal through dry quench coke powder returning and blending. The method comprises feeding red coke into a dry quenching furnace, cooling the red coke throughcirculating inert gas to obtain cold coke, separating coke powder from the circulating inert gas discharged through the dry quenching furnace through primary dedusting, a waste heat boiler and secondary dedusting, returning the coke powder into the dry quenching furnace, cooling the red coke, feeding the separated coke powder, the cold coke discharged by the dry quenching furnace and the coking coal into a coal-coke blending hopper, preliminarily mixing the cold coke, coke powder and coking coal, feeding the coking coal mixture into a coke-wet coal rotary kiln through a chute of the blendinghopper so that the coking coal and coke powder with large grain sizes are further crushed through coke block friction and collision and are further mixed, feeding the mixture into a coal-coke separation sieve, separating the coarse and fine materials, feeding the fine materials into a coke oven, carrying out coking to obtain red coke and feeding the coarse materials into a coke treatment system. The method has simple processes, effectively returns the coke powder into the coking coal, recovers the waste heat of the coke powder, effectively dries the coking coal, greatly reduces dust emission and is environmentally friendly.

Description

technical field [0001] The invention relates to the field of coal chemical industry, in particular to a method for remixing dry quenched coke powder coke to coking coal. Background technique [0002] Powder coke is one of the uncontrollable by-products in the coking production process. Its physical and chemical properties are roughly equivalent to those of bulk coke, and its quantity is large, accounting for about 10% of the total coke. Judging from the current market situation, the sales of powder coke <25mm is not smooth, and the backlog is serious, polluting the environment. A large amount of powdered coke can only be treated as low-grade fuel, generally used as fuel in the sintering process, or blast furnace injection coal. If these powdered cokes are mixed into coal materials for coking, it will not only solve the problem of the sale of powdered cokes. Environmental pollution is reduced, and a large amount of lean coal can be saved to achieve secondary utilization ...

AI Technical Summary

Problems solved by technology

[0016] The temperature of these dusts is relatively high, and the remaining heat has not been utilized