Catalytic cracking catalyst regeneration method and device

Abstract

The invention relates to a catalytic cracking catalyst regeneration method and a catalytic cracking catalyst regeneration device. The method comprises the following steps: (1) a spent catalyst contacts a first oxygen-containing gas, and coke burning is carried out; (2) a mixture obtained after coke burning contacts methanol, and combustion is carried out; and (3) the mixture obtained after combustion contacts a second oxygen-containing gas, and coke-burning regeneration is continued. The regeneration device comprises a coke burning tank and a regenerator. The inner space of the regenerator is divided into a catalyst dense phase zone positioned in the lower part and a catalyst dilute phase zone positioned in the upper part. The top of the coke burning tank is communicated with the catalyst dilute phase zone of the regenerator through a delivery pipe, such that the mixture obtained through the coke burning process in the coke burning tank can be delivered to the regenerator. A methanol distributor is arranged in the delivery pipe, and is used for introducing methanol into the delivery pipe. With the method provided by the invention, regeneration device local overheating and over-temperature phenomena caused by dilute phase tail burning can be avoided, such that regeneration device stable operation can be realized.

Description

technical field [0001] The invention relates to a catalytic cracking catalyst regeneration method and catalytic cracking catalyst regeneration equipment. Background technique [0002] Catalytic cracking is the most important processing technology for lightening heavy oil in refineries. During the catalytic cracking process, heavy oil is cracked into gas and light hydrocarbons on the surface of the catalyst, and at the same time, carbon deposits appear on the surface of the catalyst, which leads to a significant decline in activity. In order to restore the cracking activity of the catalyst and provide the required heat, the coke-deposited catalyst is sent to the regenerator after the reaction to burn off the coke attached to the catalyst and restore the activity of the catalyst. Coke combustion will release a large amount of CO 2 and CO. A large number of industrial data show that the dilute phase space for regeneration is very large, and the residence time of the flue gas ...

AI Technical Summary

Problems solved by technology

[0003] From the point of view of the existing technology, most of the traditional CO combustion aids use platinum as the active component. Platinum is expensive and has limited resources. Moreover, the other main disadvantage of the traditional noble metal-supported CO combustion aids is that the loaded noble metals are exposed to high temperature water vapor. It is easy to condense and deactivate, so it is necessary to continuously replenish new combustion accelerants; secondly, the carrier is mostly irregular powdery oxides, whose physical properties do not match the cracking catalyst, and the fluidization effect during use is not good, resulting in large losses

Setting a buffer zone or turbulent zone or adding fresh air can alleviate the dilute-phase overheating to a certain extent, but it cannot fundamentally solve the problem of dilute-phase overheating

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