Coal-gas-circulation coal whole-size-grading pyrolytic coupling hot-pressing formed coke preparation technique and system

Abstract

The invention provides a coal-gas-circulation coal whole-size-grading pyrolytic coupling hot-pressing formed coke preparation technique and system. Raw coal is divided into slack coal and pea coal by a raw coal preheating grading system; the coal gas generated by the method is used as a heat source for slack coal pyrolysis in a slack coal pyrolyzing furnace, and pyrolytic coal gas generated by slack coal pyrolysis is used as a heat source for pea coal pyrolysis; hot semicoke obtained after the slack coal and pea coal pyrolysis is used as a raw material for preparing the hot-pressing formed coke; and tar slag collected at the coal pyrolysis section is used instead of part of the adhesive for preparing the hot-pressing formed coke. The coal pyrolysis technique and hot-pressing formed coke preparation technique are coupled to produce the formed coke, thereby implementing graded utilization of coal and coke making of mill coal, saving the rare coke resources for the nation, and implementing high added value utilization of the product semicoke. The tar slag generated at the coal pyrolysis section is used as part of the adhesive instead of part of high-price coal pitch, thereby achieving the goal of waste reutilization. By using the hot semicoke as the raw material, the formed coke is formed under hot conditions, so that the heat utilization efficiency is high.

Description

technical field [0001] The invention relates to the technical field of coal chemical industry, in particular to a coal gas circulation coal full particle size graded pyrolysis coupled hot-pressed coke preparation process and system. [0002] Background technique [0003] China's coal reserves account for 12% of the world's coal resources, my country's low-rank coal reserves account for about 50% of coal reserves, and output accounts for 30% of the current total. As a raw material for the production of metallurgical coke - coking coal resources are very scarce, reserves Less than 10% of the total coal reserves. [0004] Low-rank coal is not suitable for long-term storage and long-distance transportation due to its high moisture, high volatile content, low calorific value, and high spontaneous combustion characteristics, and has long been regarded as a low-quality coal resource. But through pyrolysis, this low-quality coal can produce high value-added pyrolysis gas, tar and s...

AI Technical Summary

Problems solved by technology

[0008] 1. The dust removal efficiency of the pyrolysis gas dust removal technology of this technology is not high, and the dust content in the recovered tar is high;

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