Process for preparing needle coke

A needle coke and coke tower technology, which is applied in the field of needle coke preparation, can solve the problems of not paying attention to the sufficient growth and stretching deformation of the mesophase at the same time, and the difficulty of needle coke and the like.

Inactive Publication Date: 2008-11-12
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] None of the above methods paid attention to the two key factors of the full growth of the mesophase and the subsequent tensile deformation, so it is not easy to produce needle coke with excellent performance and well-developed needle-like streamline texture.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Example 1: Coking raw material A (FCC clarified oil, asphaltene content 0.5wt%, density 0.98g cm -3 , ash 0.03wt%, aromatics 75wt%, sulfur content 0.45wt%) pumped into the delayed coking coke tower for delayed coking, feed rate 1kg·hr -1 , the pressure at the top of the coke tower is 0.8MPa, the coke charging time is 36 hours, the circulation ratio is 0.6, the initial temperature of the coke tower inlet is 430°C, and then press 3°C·hr -1 Carry out programmed temperature rise, when the temperature rises to 500°C, use 15°C·hr -1 Carry out the programmed temperature rise to 530°C to stop the temperature rise and continue this temperature for 3 hours until the end of the coking test to obtain needle-shaped green coke, which is calcined at 1400°C (combustion of volatiles released by heating needle-shaped green coke in the calciner And the calcination is completed, the calcination time is 0.1~1hr) to obtain needle coke, and it is found that the needle coke is a developed fib...

Embodiment 2

[0015] Example 2: Coking raw material B (thermal cracking residue, asphaltene content 0.5wt%, density 0.92g cm -3 , ash -1 , the top pressure of the coke tower is 1.2MPa, the coke charging time is 40 hours, the circulation ratio is 0.5, the initial temperature of the coke tower inlet is 420°C, and then the pressure is 2.5°C·hr -1 Carry out programmed temperature rise, when the temperature rises to 490°C, use 10°C·hr -1 Carry out programmed temperature rise to 520°C constant temperature and continue this temperature for 2 hours until the end of the coking test to obtain needle-shaped green coke. Calcination is completed, the calcination time is 0.1~1hr) to obtain needle coke, and it is found that the needle coke has a relatively developed fiber streamline structure, and the thermal expansion coefficient CTE is 2.17×10 -6 ℃ -1 .

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PUM

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Abstract

The invention provides a method for preparing needle coke. The method is as follows: after delayed coking treatment of fraction or residual oil which are rich in arene through a certain temperature rise formula, green coke obtained is calcined, and the needle coke with high intermediate phase content and developed needle structure are prepared. The petroleum raw materials used comprise mixture of one type or a plurality of types among virgin wax oil, coked wax oil, catalytic cracking clarified oil, ethylene tar, coal tar, dense oil, residual oil and other hydrocarbon-enriched substances. The delayed coking temperature rise formula is characterized in that: intermediate phases generated can be driven to grow fully and are flushed by air flow with enough flow rate before solidification, thereby the granularity of the needle coke prepared is large (the content of coke breeze is not more than 25 weight percent) and the needle coke can be used for large-scale steel-making electric furnaces. When the method is used for an industrial device, people only need to adjust the prior temperature rise formula according to the characteristics of the raw materials and the technological flow.

Description

technical field [0001] The invention belongs to a preparation method of needle coke, more specifically, the invention is to carry out delayed coking of one or more aromatic-rich fractions derived from petroleum and coal tar and mixtures thereof, and increase the feed rate in the later stage of feeding The material temperature can be adjusted to self-generate more gas products that can wash out the mesophase, so as to obtain the advanced preparation process of high-power and ultra-high-power needle coke. Background technique [0002] The preparation of needle coke is not only related to the properties of raw materials, but also closely related to the production process parameters. By adjusting these process parameters, the key index of thermal expansion coefficient of needle coke can be greatly improved. The US patent (USP4547284) pointed out that after the delayed coking stops feeding, inject high-temperature inert gas to significantly increase the temperature in the coke dr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G9/14
Inventor 郭爱军王宗贤
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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