Method for producing needle coke raw material by using delayed coking process

Abstract

The invention discloses a method for producing a needle coke raw material by using a delayed coking process. In the method, full-range coal tar is imported to the top and the middle and a high-temperature conventional coking raw material is imported to the bottom; the high-temperature oil gas generated by the conventional coking raw material via high-temperature cracking is mixed with the full-range coal tar with lower temperature at the top and the middle of a reactor so that the full-range coal tar can crack hydrocarbon molecules with high reaction activity at a proper high temperature to achieve the aim of desorption; for the full-range coal tar, under the condition of the delayed coking process, asphaltene and partial colloid are condensed to form coke which is deposited in a coking tower so as to remove the components going against the production of the needle coke; furthermore, by means of the injection of the low-temperature full-range coal tar, the cracking temperature of the conventional coking raw material is reduced, the high-temperature cracking time of the conventional raw material is shortened, the secondary reaction is decreased, the coke generation rate is reduced and the stable operation period of a single tower is prolonged.

Description

technical field [0001] The invention belongs to a process method for producing needle coke raw materials. Specifically, it is a method of producing needle coke raw materials and simultaneously producing light distillate oil and coke by using a delayed coking process. Background technique [0002] Needle coke is the main raw material for producing high-power and ultra-high-power graphite electrodes. The most critical issues in the production of needle coke are the selection and pretreatment of raw materials. According to the coke formation mechanism of needle coke, the raw materials for producing needle coke must meet the requirements of high aromatic content, among which the content of linearly connected three-ring and four-ring short side chain aromatics is mostly, generally requiring the content of aromatics to reach 30%-50%; colloid Colloids and asphaltenes are low in content of asphaltenes. Colloids and asphaltenes are hydrocarbon compounds with macromolecular condense...

AI Technical Summary

Problems solved by technology

At present, some full-fraction coal tar is mixed with vacuum residue for delayed coking, which is used to improve the yield and properties of needle coke raw materials, but the amount of full-fraction coal tar should not be too much, otherwise the delayed coking will be significantly shortened. The operation cycle of the single tower, and the whole fraction of coal tar reacts at a higher temperature, and the reaction time is long, so that the fraction suitable for needle coke raw material will be aggregated in large quantities, reducing the yield of needle coke raw material

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