A method and system for regenerating a coked catalyst

Abstract

The invention discloses a regeneration method and system for a coking catalyst. The method comprises the steps as follows: the coking catalyst is sent into a riser regenerator from the bottom of the riser regenerator to be alternately contacted with at least one stream of oxygen-rich gas and at least one stream of oxygen-containing gas from bottom to top and regenerated, and a regenerated catalyst is obtained; the riser regenerator is provided with at least one regeneration section comprising a thin pipe section and a thick pipe section, the thick pipe section in the regeneration section is located above the thin pipe section, the oxygen-rich gas is sent into the riser regenerator from the lower part of the thin pipe section, and the oxygen-containing gas is sent into the riser regenerator from the lower part of the thick pipe section; the oxygen volume content of the oxygen-rich gas is larger than 21vol%, and the oxygen-containing gas is selected from at least one of oxygen, air and flue gas. With the adoption of the method adopting the system, the coking efficiency can be substantially improved, the catalytic cracking selection of the regenerated catalyst can be improved, and the size of the regenerator can be reduced in the same catalyst treatment quantity.

Description

technical field [0001] The invention relates to a method and system for regenerating a coked catalyst. Background technique [0002] The catalytic cracking reaction of heavy oil generates hydrogen-rich components such as liquefied gas and gasoline, and also generates a part of coke with relatively low hydrogen content. The deposition of coke on the catalyst greatly reduces the activity and selectivity of the catalyst. Using the high temperature oxidation regeneration method, the coke on the catalyst is removed by combustion to restore the activity and selectivity of the catalyst. This process is called catalyst regeneration. The conventional catalyst regeneration method is to inject air into the bubbling fluidized bed or turbulent fluidized bed and adopt a single-stage regeneration method for regeneration. In this fluidized bed with low linear velocity and full gas-solid back mixing, gas and The solid contact efficiency is low, and the regeneration speed of the catalyst is...

AI Technical Summary

Problems solved by technology

For example, the highest activity recovery of the regenerated catalyst can be achieved during regeneration, but the regenerated catalyst may cause high coke and dry gas yields due to its high activity when participating in the reaction, which is undesirable

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