System and method for producing raw material of needle coke by oil slurry

Abstract

The invention discloses a system for producing a raw material of needle coke by oil slurry. The system comprises a vacuum distillation unit, an electrostatic solid-liquid separation unit and an extraction unit. The vacuum distillation unit is connected with the electrostatic solid-liquid separation unit through a pipeline, and the extraction unit is connected with the electrostatic solid-liquid separation unit or the vacuum distillation unit through a pipeline. Solid particles are removed by process combination of vacuum distillation and electrostatic solid-liquid separators; effective components of the raw material for producing the needle coke are obtained by process combination of vacuum distillation and extraction; catalyst particles, especially catalyst particles with diameters smaller than 5 micrometers, in oil slurry can be removed effectively, and solid content in the oil slurry after processing is lower than 10 ppm.

Description

technical field [0001] The invention relates to the technical fields of petrochemical industry and carbon materials, in particular to a system and method for producing needle coke raw materials from oil slurry. Background technique [0002] Needle coke is a high-quality variety of carbon materials. It is the main raw material for the production of graphite electrodes for high-power and ultra-high-power electric furnace steelmaking. Its graphitized products are widely used in electric furnace steelmaking electrodes, nuclear reactor deceleration materials and rocket technology. According to different production raw materials, needle coke can be divided into oil-based needle coke and coal-based needle coke. Needle coke produced from petroleum heavy oil as raw material is the oil system, and needle coke produced from coal tar pitch and its fractions as raw material is the coal system. [0003] The most critical issues in the production of needle coke are the selection and pretr...

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Problems solved by technology

[0007] The solid content of the needle coke raw material processed by the existing slurry refining system is unstable, which will affect the quality indicators such as the strength of the needle coke product in the subsequent system. Unqualified raw materials can only be reworked or downgraded as raw materials for ordinary products

In this way, in order to ensure qualified needle coke raw materials at the production site, only low solid content slurry can be selected when purchasing raw material oil slurry. The requirements for solid phase content indicators are strict, which limits the source of raw material oil slurry, thereby increasing production costs. , affecting the economic benefits of the enterprise

[0008] The particles contained in the oil slurry are about 10-20 microns on average, and about 20% of them are fine particles below 5 microns; traditional filter equipment cannot remove these particles in large quantities continuously, and the existing oil slurry pretreatment system is in operation Can remove larger particle size catalyst particles, but cannot effectively remove fine catalyst particles below 5 microns

In particular, colloids and asphaltenes in oil slurry will compete with catalyst particles during the electrostatic separation process, which will affect the removal effect of solid particles

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