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Delayed coking method for increasing coke strength

A delayed coking method, a technology of coke strength, used in cracking, non-catalytic thermal cracking, petroleum industry, etc.

Active Publication Date: 2007-06-27
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method cannot avoid the tendency of the delayed coking unit to form fine coke due to low green coke strength and damage by external forces during the process of water conservancy decoking and during the storage and transportation of raw coke.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Coking experiments were carried out using the above raw materials. The coke tower was fed with separate coking raw material oil at the initial stage of coking. The temperature at the outlet of the heating furnace was maintained at 455°C. The feed to the coke tower is changed to separate coking cycle oil and coking wax oil circulation, the furnace outlet temperature remains unchanged after rising to 510°C, and the pressure at the top of the coke tower rises to 1.0MPa and remains unchanged. The coke properties after coking reaction are listed in Table 2.

[0022] It can be seen from Table 2 that the coke strength of the present invention is significantly improved, which is manifested by a decrease in the volatile content of the green coke and a decrease in the anti-wear index. At the same time, the invention can increase the true density of the coke, reduce the thermal expansion coefficient of the coke, and improve the quality of the needle coke.

Embodiment 2

[0024] Still using the above raw materials for coking experiments, the outlet temperature of the heating furnace was 450°C at the initial stage of coking, and the temperature was raised after 1 / 2 of the coking operation cycle, and the final temperature reached 515°C; After 1 / 2 of the coking operation period, the pressure was raised to 1.0MPa in the final stage; the circulation ratio was 0.1 at the beginning, and the circulation ratio was increased after 1 / 2 of the coking operation cycle to reach 10:1 in the final stage. The coke properties after the coking reaction are listed in Table 2 .

[0025] It can be seen from Table 2 that the coke strength of the present invention is significantly improved, which is manifested by a decrease in the volatile content of the green coke and a decrease in the anti-wear index. The invention can simultaneously increase the true density of the coke, reduce the thermal expansion coefficient of the coke, and improve the quality of the needle coke...

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Abstract

This invention is delay coking method of improving coke intensity. The coking raw oil goes into the coke tower after being heated by coking heating furnace, and react under the condition of temperature changing, pressure changing and cycling ratio changing and the coke produced is left in the tower, and the coking oil is separated into coked gas, coked oil, coked diesel oil and coked wax oil. This method produces acerate coke with relatively high intensity in order to decrease the powder coke contents in the coke, and meanwhile lowers the heat expansion coefficient of coke and improves the quality of acerate coke.

Description

technical field [0001] The invention belongs to a method for non-catalytic thermal cracking of hydrocarbon oil in the absence of hydrogen, more specifically, a delayed coking method for increasing coke strength. Background technique [0002] Delayed coking is a thermal processing process that converts petroleum raw materials into gas, gasoline fractions, diesel fractions, wax oil fractions and petroleum coke. It has the advantages of low investment, large operating flexibility, and high economic added value. It plays an important role in petroleum processing. important role. Petroleum coke is generally used as a by-product of the delayed coking process, and the price is relatively low. However, by selecting raw materials with high aromatic content, low sulfur content, and low asphaltene content, high-quality petroleum coke, that is, needle petroleum coke, can be produced through proper adjustment of the operating process. Petroleum needle coke is a high-quality, special-pu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G9/00
Inventor 王玉章申海平刘自宾施昌智
Owner CHINA PETROLEUM & CHEM CORP
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