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Needle coke preparation method and device

A technology of needle coke and coking wax oil, applied in coking ovens, coking carbonaceous materials, petroleum industry, etc., can solve problems affecting the quality of needle coke, incomplete development, unevenness, etc.

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, due to the deficiencies of existing technologies, the development of wide-area mesophase is often incomplete or uneven, resulting in many defects in needle coke products, which affect the quality of needle coke

Method used

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  • Needle coke preparation method and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Catalytic cracking clarified oil treated in a certain refinery is used as raw material, and its properties are shown in Table 1. The coker wax oil added is the middle distillate oil separated by the fractionation system, and the addition amount is 10%, which is heated to 385°C in a pretreatment heating furnace After that, it enters into a stirred reactor and stays for 4 hours under the conditions of temperature 375°C, pressure 1MPa, and stirring rate 250r / min. Then enter the buffer tank 7 through the pipeline 6, the temperature of the buffer tank is 250°C, and the pressure is 0.3MPa. The raw oil flowing out of the buffer tank is mixed with the heavy distillate oil separated from the coking fractionation tower. After being heated by the coking heating furnace, it enters the delayed coking tower for coking reaction. The coking heating furnace is controlled by variable temperature. The initial temperature is 435 ° C for 2 hours, and then the temperature is raised to 480 ° ...

Embodiment 2

[0035] The wax oil fraction obtained after thermal cracking of residue oil is used as raw material, and its properties are shown in Table 1. The added coker wax oil is the heavy distillate oil separated by the fractionation system. The addition amount is 5%, and it is heated by a pretreatment heating furnace After reaching 375°C, it enters into a stirred reactor, and stays for 6 hours at a temperature of 365°C, a pressure of 0.8MPa, and a stirring rate of 250r / min. The treated raw oil enters the buffer tank, the temperature of the buffer tank is 280°C, and the pressure is 0.2MPa. The raw oil flowing out of the buffer tank is mixed with the heavy distillate oil separated from the coking fractionation tower, heated by the coking heating furnace, and then enters the delayed coking tower for coking reaction. Raise the temperature to 480°C at a uniform speed within 10 hours, during which the coking cycle ratio is controlled to 0.8 and the pressure is 1.5MPa; feed at a constant temp...

Embodiment 3

[0039] The raw materials are the same as in Example 1, the added coker wax oil is the middle distillate oil separated by the fractionation system, and the addition amount is 8%. After being heated to 375°C in the pretreatment heating furnace, it enters the reactor with stirring. Under the conditions of 2MPa and stirring rate of 350r / min, stay for 6h. The treated raw oil enters the buffer tank 7 through the pipeline 6, the temperature of the buffer tank is 300° C., and the pressure is 0.2 MPa. The raw oil flowing out of the buffer tank is mixed with the heavy distillate oil separated from the coking fractionation tower, heated by the coking heating furnace, and then enters the delayed coking tower for coking reaction. Raise the temperature to 470°C at a constant speed within 15 hours, during which the coking cycle ratio is controlled to 0.8 and the pressure is 2MPa; feed at a constant temperature of 470°C for 2 hours, and at the same time increase the coking cycle ratio to 1.5;...

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Abstract

The invention provides a needle coke preparation method and device. The preparation method comprises mixing raw oil and a part of coker gas oil, preheating the mixture, feeding the mixture into a pretreatment reactor with a stirring function, wherein the upper part of the reactor is provided with gas vents and the rear part of the reactor is provided with a buffer tank, buffering the reactor distillate through the buffer tank, feeding the reactor distillate into a coking heating furnace, carrying out heating, feeding the material into a delayed coking device and preparing needle coke. A relaxative reaction zone is built in front of the coking device, a stirring process always keeps a uniform state of a system and a high activity component polymerization rate is effectively controlled. Through control of raw material pretreatment conditions, in the reaction system, a lot of an intermediate phase precursor is produced. The number of the intermediate phase precursor is large, volume is small and dispersion is uniform so that the high-quality needle coke product can be prepared.

Description

technical field [0001] The invention relates to a method and a device for preparing needle coke. Specifically, it is a method and device for preparing needle coke with a low coefficient of thermal expansion (CTE). Background technique [0002] There are two main raw materials for ultra-high power graphite electrode production, needle coke (aggregate) and binder pitch. Needle coke has the characteristics of low coefficient of thermal expansion (CTE) and easy graphitization, and is the preferred material for preparing high-power and ultra-high-power graphite electrodes. Ideal needle coke for electrodes requires low sulfur and nitrogen content, because these impurity elements will lead to low electrode strength. A low coefficient of thermal expansion (CTE) is important because the high thermal shock resistance of the electrode is directly related to the low CTE value of the aggregate coke, and a higher true density is also desired. During the formation of needle coke, the ra...

Claims

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Application Information

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IPC IPC(8): C10B55/00C10B57/04
Inventor 郭丹初人庆勾连忠矫德卫
Owner CHINA PETROLEUM & CHEM CORP
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