Catalytic cracking conversion method with relay use of catalyst curd its device

Abstract

The invention is a catalyst relay catalytic cracking conversion method and device, belonging to petroleum refining technical field, making raw oil and back-refined oil firstly perform catalytic cracking reaction in the respective risers, successively merging and extracting deactivated catalyst, where the reacting oil gas changes to contact with low temperature catalyst used in the gasoline reaction and continue reaction; a heavy oil reactor is connected in parallel with a gasoline reactor; the gasoline and catalyst complete reaction in the gasoline reactor and then can make gas-solid separation in a gasoline settler, where the oil gas is discharged through pipeline, the extracted catalyst is fed into the position below heavy oil modifying reaction stage and cracking reaction stage to continue heavy oil reaction and can also be fed into a gas-solid separator arranged in the heavy oil modifying reaction stage for separating, where the gasoline gas is directly drawn out and the catalyst takes part in the reaction in this stage; a catalyst return pipe is arranged between the gasoline settler and gasoline reactor bottoms to make a part of catalyst used in the gasoline reaction return to the gasoline reactor bottom so as to take part in the gasoline reaction again.

Description

technical field [0001] The invention belongs to the technical field of petroleum refining, and in particular relates to a catalytic cracking conversion method and a device thereof using catalyst relay. Background technique [0002] Catalytic cracking is the most important processing device for heavy petroleum fractions (including vacuum wax oil, coker wax oil, atmospheric press oil, vacuum press oil, etc.), and is the production device for 80% of gasoline in China. The catalytic cracking reaction uses a riser reactor. The reaction raw materials enter at the bottom of the riser. Under the catalyst environment, the reaction is carried out at an average flow rate of about 15m / s and a temperature of about 500°C. The reaction time is generally about 3s, and the length of the riser is 30-40 meters. During the reaction process, about 7-10% of the raw materials will be converted into coke, which will adhere to the surface and pores of the catalyst, deactivate the catalyst and lose ...

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Problems solved by technology

In the prior art, these characteristics of gasoline reaction have not been fully utilized

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