Needle-like coke preparation method

A technology of needle coke and coking tower, which is applied in the petroleum industry, processing hydrocarbon oil, etc., can solve the problems of coking in heating furnaces, and achieve the effects of increasing linear speed, good dispersibility, and increasing temperature.

Active Publication Date: 2017-05-10
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the entire coking reaction system is a temperature-variable operation process. The heat in the tower comes from the heat brought in by fresh raw materials. In order to gradually increase the temperature of the reaction system, it is often necessary to continuously increase the temperature of the heating furnace. Long-term high-temperature operation will inevitably lead to the heating of the furnace. internal coking

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037]Using the method for preparing needle coke in the coking tower of the present invention, the raw material oil and the circulating oil adopt the upper and lower feeding methods, and the materials that are not easy to coke adopt the lower feeding method to carry out the delayed coking reaction. The height from the upper feed inlet to the bottom of the tower is 4 / 5 of the total tower height, and the height of the packing section at the bottom of the tower is 1 / 10 of the total tower height.

[0038] The mixed circulating oil of raw material oil enters the coking tower after being heated by the raw oil heating furnace. The circulation ratio is 0.8. 3h. When the outlet temperature of the raw oil heating furnace is at a constant temperature of 470°C, the raw material oil and circulating oil enter the coking tower from the upper feed port; tower; when the raw oil heating furnace reaches 500°C, the substances that are not easy to coke will also enter the coking tower from the lo...

Embodiment 2

[0040] EXAMPLES The method of the present invention is used to prepare needle coke. Different from Example 1, the coking tower has a pressure relief process during the coking process.

[0041] The mixed circulating oil of raw material oil enters the coking tower after being heated by the raw oil heating furnace. The circulation ratio is 1.2. 3h. When the outlet temperature of the raw oil heating furnace is at a constant temperature of 480°C, the raw material oil and circulating oil enter the coking tower from the upper feed port; Coking tower: When the raw oil heating furnace reaches 505°C, the substances that are not easy to coke will also enter the coking tower from the lower feed port after being pre-heated. The heating process of the non-coking material is also controlled by variable temperature. The initial temperature is 505°C, and then the temperature is raised to 530°C at a rate of 10°C / h and kept at a constant temperature until the end of the reaction. The feed amo...

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Abstract

The invention provides a needle-like coke preparation method, which comprises that a raw material is heated to a temperature of 465-510 DEG C with a heating furnace, the heated raw material oil enters a coking tower, and the oil-gas produced from the reaction is discharged from the tower top; the produced oil-gas is separated to obtain gas, gasoline distillate, diesel oil distillate and wax oil distillate; and the wax oil distillate adopted as circulation oil is mixed with the raw material oil according to a certain circulation ratio, the mixture enters the coking tower, and a difficulty-coking substance is introduced from the lower material inlet of the coking tower when the outlet temperature of the heating furnace is higher than 490 DEG C until the reaction period is ended, and the generated needle-like coke is deposited on the bottom portion of the coking section. According to the present invention, the method uses the upper material feeding and the lower material feeding combined mode so as to effectively eliminate the disturbance of the material feeding on the eurytopic intermediate phase forming.

Description

technical field [0001] The invention relates to a method for preparing needle coke, in particular to a method for preparing needle coke with low coefficient of thermal expansion (CTE) and low volatile content by adopting a delayed coking process. Background technique [0002] Needle coke has the characteristics of low CTE and easy graphitization, and is the preferred material for the production of high-power and ultra-high-power graphite electrodes. During the formation of needle coke, the raw material oil needs to go through the process of formation, growth and fusion of small mesophase spheres, develop into a wide-area mesophase, and then form a linear texture structure under the action of air flow, and finally solidify Produce needle coke. In the early stage of coking, excessive disturbances in the system should be avoided to ensure the slow and stable development of mesophase spheres. The degree of development of mesophase directly affects the product performance of nee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G53/00
CPCC10G53/00
Inventor 郭丹初人庆勾连忠矫德卫
Owner CHINA PETROLEUM & CHEM CORP
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