Oil-based needle coke raw material deep decompression pretreatment system

Abstract

The invention discloses an oil-based needle coke raw material deep decompression pretreatment system which comprises a heating furnace, a decompression tower, a decompression stripping tower, a first-line oil outlet system, a second-line oil outlet system, a third-line oil outlet system, a top dirty oil outlet system, an asphalt oil outlet system and an oil slurry heat exchange system, the decompression tower is sequentially connected with the top dirty oil outlet system, the first-line oil outlet system, the decompression stripping tower and the asphalt oil outlet system from top to bottom; the upper half part of the decompression stripping tower is connected with the second-line oil outlet system, and the lower half part of the decompression stripping tower is connected with the third-line oil outlet system; and the heat exchange system is connected with each heat exchanger. According to the oil-based needle coke raw material deep decompression pretreatment system, the raw material oil slurry is separated into first-line oil, second-line oil and third-line oil through deep decompression, so that multi-stage separation of the oil slurry is realized, the components are simpler, subsequent coking treatment is facilitated, and the needle coke product with higher quality is obtained.

Description

technical field [0001] The invention belongs to the field of needle coke production equipment, in particular to a deep decompression pretreatment system for oil-based needle coke raw materials. Background technique [0002] Needle coke is a high-performance carbon material with clear lines on the surface and rectangular strips after crushing. The fiber structure can be observed under the microscope. It has small thermal expansion coefficient, high degree of graphitization, heat resistance and corrosion resistance, and various High anisotropy and other excellent characteristics, widely used in high power (HP) and ultra high power (UHP) graphite electrodes, special functional materials and their composite carbon materials and other fields. [0003] Needle coke can be divided into coal-based needle coke and petroleum needle coke according to different raw materials. Generally speaking, petroleum needle coke has better performance than coal-based needle coke, and the degree of...

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Problems solved by technology

[0008] It can be seen that most of the existing technology centers use the mid-stage oil of vacuum distillation as the raw material for the production of needle coke. However, the mid-stage oil is still a mixture of various fractions, and further separation is required to obtain higher-quality needle coke products. At the same time, the existing technical conditions still have the disadvantages of large energy consumption and high cost of steam production

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