Technology for producing needle coke by kettle-type coking

A process method and needle coke technology, which is applied in the direction of coking carbonaceous materials, cracking, coke ovens, etc., can solve the problems of slowing down the generation rate of cracked gas, insufficient side pressure and shear force, and difficult to achieve.

Active Publication Date: 2011-01-12
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are following deficiencies in the above-mentioned invention: (1) the invention requires that the material be heated to 480-550 DEG C in 2-30s, which is difficult to realize industrially; , and then the method of preparing needle coke is released during the reaction. Since the inert gas can only be filled into the upper space of the reactor and cannot be dissolved in the material, the gas is released during the reaction, and the flow of the inert gas will not affect the intermediate phase. (3) In the later stage of the reaction, the polymerization reaction is the main one, and the cracking gas generation rate is slowed down, which is not enough to form sufficient side pressure and shear force, so that the entire anisotropic region is forced to align when the gas flow is discharged.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Using catalytic cracking residue as raw material, put it into the coking kettle, close the constant pressure valve, and the system will slowly heat up. When the system pressure reaches 1.5MPa, adjust the constant pressure valve to keep the system pressure constant at 1.5MPa and control the gas at 0.04h -1 Rate discharge, when the system temperature reaches 480℃, keep the temperature constant for 3 hours, and blow in inert gas nitrogen from the bottom of the coking tank, and keep the discharge gas rate at 0.05h -1 . After the constant temperature is over, stop blowing of inert gas, the system is heated to 520℃, and it is scorched for 3 hours. The petroleum-based needle coke product is trial-produced. Its performance indicators are:

[0015] Volatile matter V, (wt%) 0.50

[0016] Ash A, (wt%) 0.10

[0017] Sulfur content, (wt%) 0.26

[0018] True specific gravity, (g / ml) 2.12

[0019] Aspect ratio K 2.04

[0020] Coefficient of thermal expansion CTE, (×10 -6 / ℃) 0.94(100-600℃)

Embodiment 2

[0030] Take coal tar from which the harmful quinoline insoluble matter is removed as raw material, put it into the coking kettle, close the constant pressure valve, and the system will slowly heat up. When the system pressure reaches 2.0MPa, adjust the constant pressure valve to keep the system pressure constant at 2.0MPa, and Control gas at 0.06h -1 When the system temperature reaches 480℃, keep the temperature constant for 4 hours, and blow the inert gas hydrogen from the bottom of the coking tank, and keep the exhaust gas rate at 0.05h -1 . After the constant temperature is over, stop blowing inert gas, and the system is heated to 530°C and scorched for 2 hours. The coal-based needle coke product is trial-produced. Its performance indicators are:

[0031] Volatile matter V, (wt%) 0.59

[0032] Ash A, (wt%) 0.09

[0033] Sulfur content, (wt%) 0.17

[0034] True specific gravity, (g / ml) 2.21

[0035] Aspect ratio K 2.06

[0036] Coefficient of thermal expansion CTE, (×10 -6 / ℃) 0.93(1...

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Abstract

The invention discloses a technology for producing needle coke by kettle-type coking, comprising the following steps: filling raw oils into a coke still; heating slowly a system to 480-500 DEG C under system pressure of 1.0-2.0MPa; controlling appropriate gas emissions rate, keeping constant temperature for 2-6h when system temperature reaches 480-500 DEG C, and blowing in inert gas from the bottom of the coke still; and heating the system to 520-550 DEG C and continuously baking for 1-4h to generate the needle coke through reaction, wherein the obtained needle coke is deposited at the bottomof a coke tower. The technology of the invention has simple flow and small investment and can obtain the high-quality needle coke.

Description

Technical field [0001] The invention relates to a process method for preparing needle coke, in particular to a method for producing needle coke by adopting a kettle-type coking process, while obtaining by-product light distillate oil. Background technique [0002] Needle coke is the main raw material for producing high-power and ultra-high-power graphite electrodes, and its economic value is very high. At present, needle coke is mainly produced by delayed coking process, selecting suitable raw materials, and obtaining needle coke under suitable delayed coking conditions. Needle coke production generally has high requirements for raw materials. The existing technology for needle coke production mainly focuses on the acquisition or production of raw materials, such as CN00125962.8, CN200510073095.0, etc. There are not many improvements in itself. [0003] CN01140582.1 discloses a method for preparing needle coke. Raw materials are placed in a tubular reactor, filled with 0.1-2MPa i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10B55/00C10G9/00
Inventor 初人庆张学萍郑庆华勾连忠
Owner CHINA PETROLEUM & CHEM CORP
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