Method for delaying coking

Abstract

The invention provides a method for delaying coking. The method comprises the following steps: 1) high temperature materials from a radiant section of a heating furnace enter a tower from positions above a foam layer of a coke tower, and a coking reaction is carried out in the coke tower; 2) when the coking reaction is carried out, steam stripping is carried out to the generated coke by continuously blowing a proper amount of high temperature steam to a bottom part of the coke tower; 3) pressure of 0.10Mpa-0.6Mpa on a top part of the coke tower is maintained, oil gas generated by the reaction is discharged from the top part of the coke tower to a fractionating tower. After carrying out the coking reaction for 0.5hr-12hr, the coke which is fully steam stripped starts to be automatically and continuously let out by a coke-discharged valve at the bottom of the tower, and the coke is discharged to a coke gathering tank or being carried way by a transmission band. With the method provided in the invention, a green coke period which can delay coking is shortened, utilization efficiency of the coke tower is improved and investment and processing energy consumption are reduced. Simultaneously, a hot and cold period circulation of the coke tower is avoided to increase a service life of the coke tower.

Description

technical field [0001] The invention belongs to the technical field of petroleum refining, and in particular relates to a delayed coking method. Background technique [0002] The delayed coking process has the advantages of strong raw material adaptability, thorough decarbonization, simple process, mature technology, and low equipment investment. It has become one of the important processes for deep processing of heavy oil. my country is one of the countries with rapid development of delayed coking processing capacity and technology in the world, and the technical level is already close to the advanced level of foreign countries. At the end of 2006, the processing capacity of delayed coking has exceeded 50Mt / a, and at the end of 2010, it has reached more than 80Mt / a, second only to the United States; the scale of a single unit has reached 2.1Mt / a. In recent years, with the deterioration of the raw materials processed by the delayed coking unit, it is manifested in high resi...

AI Technical Summary

Problems solved by technology

[0007] In order to solve the technical problem that the existing delayed coking process cannot realize the continuous operation of the decoking process, the present invention improves the existing decoking technology and provides a delayed coking method, which can solve the above problems and shorten the coking cycle of delayed coking , improve the utilization efficiency of the coke tower, reduce the investment of equipment and processing energy consumption, and avoid the cycle of cooling and heating of the coke tower, so as to prolong the service life of the coke tower

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