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Method and apparatus for production of homogeneous needle coke

A preparation device and technology of needle coke, which is applied in the field of preparation of high-quality needle coke with uniform quality, can solve the problems of undeveloped small spheres and unfavorable high-quality needle coke, so as to avoid the increase of system viscosity and the promotion of low-viscosity environment , The effect of low CTE

Active Publication Date: 2016-07-06
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it takes a certain amount of time for the raw material oil to undergo the formation and growth of mesophase spheres, and finally merge into mesophase liquid crystals. If fresh raw material oil is continuously fed into the coke tower during the mesophase solidification stage, there will not be enough fresh raw material oil. The time to develop into mesophase liquid crystals will solidify, resulting in a large number of small spheres or defects that are not fully developed in the mesophase liquid crystals, which is not conducive to the formation of high-quality needle coke

Method used

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  • Method and apparatus for production of homogeneous needle coke
  • Method and apparatus for production of homogeneous needle coke

Examples

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Comparison scheme
Effect test

Embodiment 1

[0042] The operation according to the method provided by the present invention is divided into three steps: (1) Preheat the raw material to 385°C and put it into a stirred pretreatment reactor, which has the functions of weight measurement and display. The pretreatment reaction kettle has a treatment temperature of 385°C, a pressure of 1.2MPa, and a stirring rate of 250r / min. After 1 hour of treatment, the bottom of the kettle starts to discharge materials. The furnace adopts variable temperature control, the initial temperature is 440°C and is maintained for 6 hours, then the temperature is raised to 470°C at a constant speed within 10 hours and maintained for 4 hours, and the pressure of the delayed coking tower is 1.5MPa; (2) When the constant temperature of the coking heating furnace is 440°C, the fractionation system is separated After the heavy distillate oil is heated to 390°C by the preheating furnace, it is injected into the pretreatment reactor at one time. The weight...

Embodiment 2

[0044] Using the same method as in Example 1, changing part of the operating conditions: (1) Preheating the raw materials and putting them into a stirred pretreatment reactor with weight measurement and display functions. The pretreatment reaction kettle has a treatment temperature of 395°C, a pressure of 0.5MPa, and a stirring rate of 250r / min. After 0.5 hours of treatment, the bottom of the kettle starts to discharge materials. The heating furnace adopts variable temperature control, the initial temperature is 425°C and is kept for 8 hours, then the temperature is raised to 475°C at a constant speed within 12 hours and kept for 4 hours, and the pressure of the delayed coking tower is 1.5MPa; (2) When the constant temperature of the coking heating furnace is 425°C, the fractionation system After the separated heavy distillate oil is heated to 400°C by the preheating furnace, it is injected into the pretreatment reactor at one time. The weight ratio of the heavy distillate oil ...

Embodiment 3

[0046] Using the same method as in Example 1, only part of the operating conditions were changed. Among them, the treatment temperature of the pretreatment reactor is 365°C, the pressure is 2.0MPa, and the stirring rate is 400r / min. After 20 hours of treatment, the bottom of the kettle starts to discharge. The operating conditions of the coking furnace are that the first stage of constant temperature is at 420°C for 9 hours; the first stage of temperature rise is at a rate of 2°C / h to 460°C; the second stage of constant temperature is at 460°C for 3 hours ;The second stage of heating adopts a rapid heating method, the heating rate is 60 / h, and the temperature is raised to 490°C; the third stage of constant temperature is 490°C for 4 hours.

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Abstract

The present invention provides a method and apparatus for the production of homogeneous needle coke. A pretreatment reactor equipped with a stirrer is added before a coking heating furnace; an operation mode of three-section constant temperature and two-section heating is applied to the coking heating furnace, wherein the second section of heating process uses a rapid heating operation mode with heating rate of 50-90 DEG C / h, a first section of heating process and reflux of heavy distillate oil are conducted at the same time, and the second section of heating process and reflux of intermediate distillate oil and heavy distillate oil are conducted at the same time. The present invention can significantly shorten time required for development into an intermediate liquid crystal in a coke tower, and helps full development and even distribution of the intermediate liquid crystal in the coke tower.

Description

technical field [0001] The invention relates to a method and a device for preparing needle coke, in particular to a method and a device for preparing high-quality needle coke with uniform quality. Background technique [0002] Needle coke is the main material for the production of high-power and ultra-high-power graphite electrodes, with high economic value. At present, needle coke is mainly produced by delayed coking process, and needle coke is obtained from raw materials under suitable delayed coking conditions. In addition to the properties of raw materials, the poor or unstable quality of the needle coke obtained during the coking process is one of the main reasons for the excess production of ordinary needle coke and the shortage of high-quality needle coke in China. As the main raw materials for high-power and ultra-high-power graphite electrodes and graphite electrode joints, my country's high-grade and super-grade needle cokes are completely dependent on imports. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10B55/00C10G55/04
Inventor 郭丹刘继华初人庆勾连忠矫德卫
Owner CHINA PETROLEUM & CHEM CORP
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