Coke drawing and drying method for industrial production of needle coke

Abstract

The invention relates to a coke drawing and drying method for industrial production of needle coke. The coke drawing and drying method is characterized by comprising the following steps: carrying outdelayed coking on coal tar fractions or petroleum fractions as a coking raw material from a pretreatment section by main equipment of two furnaces and three towers; respectively and continuously feeding the coking raw material into the three coking towers by a coking heating furnace; carrying out alternate circulated operation on the three coking towers. When raw materials heated by the coking heating furnace are switched from a first coking tower to a second coking tower, drawn coke and drying oil which are heated by a coke drawing and drying heating furnace are introduced into the first coking tower for drawing coke and drying, and the three coking towers carry out alternate circulated operations. According to the coke drawing and drying method disclosed by the invention, a two-furnace and three-tower industrial production flow is adopted, i.e., one coking heating furnace always heats the raw materials for the three coking towers, and the other coke drawing and drying heating furnaceheats the drawn coke and the drying oil for the three coking towers; the properties of the materials heated by the two heating furnaces are always consistent; the coke drawing and drying method has the advantages that the operation is simple and stable, coke drawing and drying are sufficient, and the quality and the yield of a product are improved.

Description

technical field [0001] The invention belongs to the technical field of coal chemical industry and petrochemical industry, and relates to the industrialized production process of coal-based needle coke and petroleum-based needle coke, in particular to a coke pulling and drying method for the industrialized production of needle coke. Background technique [0002] At present, domestic needle coke is the main raw material for the production of steel-making ultra-high power (UHP) graphite electrodes, battery anode materials used in electric vehicles, etc. In the conventional production of needle coke in the delayed coking stage of the existing technology, its industrial production process adopts One furnace and two towers process, that is, one heating furnace heats raw materials for two coking towers, the heating furnace continuously heats raw materials, and the two coking towers switch alternately. Moreover, when heating raw materials in a coking tower, the circulating oil needs...

AI Technical Summary

Problems solved by technology

In the domestic coal chemical and petrochemical industries, needle coke production facilities have been built up to 500,000 tons per year, but there is a problem: the quality cannot catch up with or exceed the level of imported needle coke, mainly in the coefficient of thermal expansion (CTE) High, small particle size, low strength

In addition, the actual operation of the needle coke production process that has been established in China is complicated, the operation is not stable, the service life of the equipment is short, and the product quality is low and unstable.

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