Improved two-stage regeneration method and equipment for catalytic cracking catalyst

Abstract

The invention provides an improved two-stage regeneration method and equipment for catalytic cracking catalyst. The equipment comprises a regeneration section of a scorched jar and a regeneration section of a dense-phase circulation bed, which are arranged in series. In the invention, carbon coke-containing catalyst to be generated is introduced into the regeneration section of the scorched jar from the bottom of the regeneration section of the scorched jar, and is contacted with the main wind of the scorched jar to generate combustion reaction to generate smoke; the generated smoke and the catalyst carried by the generated smoke ascend into the regeneration section of the dense-phase circulation bed through a porous plate-type distributor at the top of the regeneration section of the scorched jar; different superficial gas velocities in the central region and the outer ring region of the regeneration section of the dense-phase circulation bed are controlled to lead the catalyst particles to form internal circular flow between the two regions to obtain efficient regeneration; and a part of the dense-phase circulation bed catalyst circularly enters into the bottom of the regeneration section of the scorched jar, so as to improve the temperature and particle concentration of the regeneration section of the scorched jar. The method and the equipment provided by the invention havethe advantages of improving gas-solid contact, enhancing the utilization efficiency of the main wind, and lowering the energy consumption of the equipment.

Description

technical field [0001] The invention belongs to the technical field of petrochemical industry, and in particular relates to an improved two-stage regeneration method of catalytic cracking catalyst and regeneration equipment (regenerator) for realizing the regeneration method. Background technique [0002] The catalytic cracking process is one of the most important means of lightening heavy raw materials in modern oil refineries. It uses catalysts to crack heavy macromolecular petroleum hydrocarbons into high-value small molecule transportation fuels and chemical raw materials. This process usually uses molecular sieve acidic catalysts. After the heavy oil reacts in the riser, in addition to generating light hydrocarbons, a part of coke is deposited on the surface of the catalyst, resulting in a decrease in catalyst activity. Therefore, oxygen-containing gas (usually air) must be introduced to burn off this part of coke to restore catalyst activity. This process is usually ca...

AI Technical Summary

Problems solved by technology

Although the gas-solid contact effect of the charred tube is better, its catalyst concentration is lower. In order to achieve the same regeneration effect, a larger height is required, which may destroy the pressure balance with the reaction system and cause catalyst circulation problems.

On the other hand, in this method, the gas velocity in the coking section of the bed layer is too high, which may cause the problem of catalyst loss

[0010] In summary, there is still a lot of room for improvement in the existing two-stage regeneration method and equipment for catalytic cracking coke tanks

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